JPH06231510A - Recording/reproducing apparatus - Google Patents

Abstract

PURPOSE:To magnetically record signals with good accuracy by performing magnetic recording/reproduction on the basis of optically reproduced accurate signals. CONSTITUTION:In the recording/reproducing apparatus is loaded a disk-shaped recording medium 2 which has a transparent substrate 5, an optical recording layer 4 formed at one side of the transparent substrate 5 and a magnetic recording layer 3. The light from a light source 58a forms an image to the optical recording layer 4 from the side of the transparent substrate 5 by an optical head part 6. Accordingly, signals of the optical recording layer 4 are reproduced, and also signals are magnetically recorded to or reproduced from the magnetic recording layer 3 by a magnetic head part 8 provided at the side opposite to the read side of the recording medium 2. When recording signals of the optical recording layer 4 are to be reproduced and when signals are to be recorded to or reproduced from the magnetic recording layer 3, signals are modulated or demodulated based on the recording signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording or reproducing information on a recording medium.

[0002]

2. Description of the Related Art In recent years, applications of optical discs are expanding in various fields. Optical disks are divided into recordable RAM disks and non-recordable ROM disks.
RAM disk is 5 to 10 times as much as ROM disk
Double media manufacturing cost is high. In addition to this, in the case of the RAM disk, it takes real time to record the software, so that the recording of the software at the time of manufacturing causes an additional manufacturing cost. On the other hand, a ROM disk is recorded with software in a few seconds at the time of manufacturing using a stamper. Therefore, there is an advantage that the manufacturing cost of the soft recording is almost zero. Therefore, the ROM is used for distributing a large amount of information to a large number of people, for example, for electronic publishing, supplying software for music or video, and requiring low media cost.
Discs are mainly used. On the other hand, RAM disks are used only for extremely limited applications such as external storage devices of personal computers and workstations, and at present, ROM disks account for 95% or more of the optical disk market share.

However, CDROM game machines and CDROMs
As the applications for interactive use have expanded as seen in built-in personal computers, ROM disks are also required to have RAM functions. For example, in the case of a game machine, when the game is restarted, it is required to restart the game from the time when the game was last ended. For this reason, the function of saving the progress and final result at the end of the game is essential. For this reason CDROM
In a game machine using a ROM disk such as the one described above, a method of storing data in a nonvolatile memory provided in the main body, an IC card outside the main body, or an SRAM memory with a battery backup attached to a disk case is adopted. In the case of a game machine, the memory capacity to be stored may be as small as 2 kB to 8 kB. However, even in order to save this small capacity, the manufacturing cost of the non-volatile IC memory is several times higher than that of the ROM disk, so that the total cost of the small capacity RAM and the ROM disk is several times higher than that of the ROM disk. .

Other consumer interactive devices, such as home educational devices, require a small-capacity RAM for the learner's score management. A small capacity RAM for managing the tempo is required. As described above, there are few applications for which a large RAM is required for consumer use. In consumer interactive applications such as consumer multimedia devices, the emergence of new media that fulfills the three conditions of small-capacity RAM function, large-capacity ROM function, and low cost has been awaited.

As one of the means for answering this demand, a disk with a new media concept called a partial ROM disk has recently appeared, and a prototype is being made, and expectations are increasing. This is a large amount of RAM on a RAM disk
This is a combination of the two advantages of function and mass productivity when recording large-capacity software on a ROM disk. A specific configuration is a system in which a ROM area is provided in a partial area of a RAM disk such as a magneto-optical disk or a write-once disk, and software is collectively recorded at the time of disk manufacturing by a stamper. Since this system certainly has a mass production function of a large capacity ROM and a large capacity RAM function, it satisfies two of the above-mentioned three conditions. However, since the third low-cost condition is not satisfied, the partial ROM disk can be used for industrial multimedia applications such as office work, but is not suitable for consumer interactive applications in terms of price. It was

The reason why the cost of this partial ROM increases is that the RAM disk is diverted. ROM
The cost will be lower if it is based on a disk. As mentioned earlier, large RAM is used for consumer multimedia applications.
We focused on the fact that capacity is not required.

Since a large amount of information is produced in a company, a large RAM capacity is required for an industrial recording medium.
However, at home, A, such as video and audio
Except for V information, the amount of information produced is much smaller than that of companies, and therefore, the consumer interactive recording medium requires only a small RAM capacity. On the other hand, since the amount of information in newspapers and TV programs is large, the amount of information supplied to the home is large.
For this reason, consumer interactive media generally require a large ROM capacity. Large capacity RO
It can be said that a memory with M and a small amount of RAM, in other words, a "partial RAM disk" is required for consumer interactive applications. The partial RAM disk is an inexpensive ROM disk to which a small RAM is added at a negligibly low cost, and is a concept of realizing a consumer memory at a cost close to that of a ROM disk although the RAM capacity is small. One way to realize this concept is R0M
This is a method of providing a single magnetic recording layer on the back surface of the disk. In this case, the step of forming the recording layer can be performed at 1/10 or less of the cost of the ROM disk, and thus the partial RAM disk can be realized without increasing the cost of the ROM disk.

[0008]

A conventional example will be described by narrowing down to such a partial RAM disk. As the first method, a ROM disk such as a CDROM without a cartridge will be described. JP-A-56-1
63536, JP-A-57-6446, JP-A-SHO-57
-212642 and Japanese Patent Laid-Open No. 2-179951, a method of providing an optical recording portion on the front surface of a CDROM and a magnetic recording portion on the back surface thereof has already been proposed. In addition, JP-A-6
As shown in 0-70543, an optical recording section made of a non-magnetic material such as an optical disk using an Amosphas material is provided on the front surface, and a disk having a magnetic recording layer on the back surface is used. It is disclosed that a head is provided for magnetic recording. However, these documents do not disclose any important matter to specifically realize a medium or device by simply combining a magnetic recording unit and an optical recording unit. For example, a method of preventing mutual interference between the optical recording section and the magnetic recording section, a method of accessing a magnetic track with a simple configuration, a method of sharing a circuit, or a magnetic field of a medium used without a cartridge, which is important when realizing a device. A method to protect the recorded information from the external environment such as magnetism and wear, and a RAM
It does not disclose a method of compressing information recorded in the area, a method of speeding up access, a specific physical format of a track, or the like.

Further, a method of mass-producing an important medium for realizing the medium at a low cost, a method of making the medium conform to the CD standard, and the like, that is, a method for concretely realizing a consumer partial RAM disk, are completely absent. It has not been disclosed in the conventional example. Therefore, in the method disclosed heretofore, there has been a big problem that it is difficult to practically put into practical use a medium and a system that can be used for consumer use. In the present invention, the first method is CD
A method for specifically implementing a ROM disk type partial RAM disk and system used without a cartridge such as a ROM for the above items is disclosed.

As the second method, a disc having a recording function is generally provided with a cartridge. Therefore,
The ROM disc, which is compatible with the recording disc, also has a cartridge. Recordable MD mini-discs, which have recently appeared, abbreviated as MD ROM discs
Has been proposed recently. The recordable MD disc records music magneto-optically. Therefore, a method of combining the magneto-optical drive and the magnetic recording function can be considered. A conventional example of this method is disclosed in Japanese Patent Laid-Open No. 60-57558, in which a magneto-optical recording area is provided on a part of the surface and a magnetic recording portion is provided on another area of the surface. But,
Using a medium with an optical recording layer on the front side of the back side of the transparent substrate of the media and a magnetic recording layer on the back side, a magneto-optical head is provided on the front side of the medium on the device side It is not disclosed that a contact type magnetic field modulation head is provided and recording is performed directly from the magnetic field modulation head, or that magnetic recording is performed on the magnetic recording layer by a magnetic recording head integrally formed with the magnetic field modulation head. . That is, the method of providing the magnetic field modulation type head unit with the magnetic recording function or integrating the magnetic head has not been disclosed in the conventional example.

As described in the conventional example, the ROM disk without the cartridge and the RO with the cartridge are provided.
As a method of providing a RAM function on the M disk, a method of concretely realizing it has not been disclosed in the conventional method.

[0012]

To achieve this object, a recording / reproducing apparatus of the present invention is a disk type recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate. Mounted, the light from the light source is imaged on the optical recording layer from the transparent substrate side by the optical head unit and the optical head moving unit, and the signal of the optical recording layer is reproduced by the optical recording / reproducing circuit. In a recording / reproducing apparatus in which a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of a recording medium, and magnetic recording or reproduction of the magnetic recording layer is performed by a magnetic recording / reproducing circuit, a recording signal of the optical recording layer is reproduced. However, when recording on or reproducing from the magnetic recording layer, modulation or demodulation is performed based on the recording signal.

[0013]

Since magnetic recording / reproduction is performed based on a highly accurate optical reproduction signal, magnetic recording can be performed with high accuracy.

[0014]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a recording / reproducing apparatus according to the present invention. The recording / reproducing apparatus 1 has therein a recording medium 2 including a magnetic recording layer 3, an optical recording layer 4 for optical recording, and a light transmitting layer 5.

At the time of magneto-optical reproduction, the light from the light emitting portion is converged on the optical recording layer 4 by the optical head 6 and the optical recording block 7 to reproduce the recording signal recorded magneto-optically. At the time of optical recording, the laser light is focused on a specific portion of the optical recording layer 4 by the optical head 6 and the optical recording block 7, and the temperature thereof is raised to the Curie temperature or higher. In this state, the magnetic head 8
The magnetic recording block 9 modulates the magnetic field applied to this portion to perform conventional magneto-optical recording.

At the time of magnetic recording, a magnetic signal is recorded on the magnetic recording layer 3 using the magnetic head 8 and the magnetic recording block 9. The system control unit 10 obtains operation information and output information from each circuit, drives the drive block 11, and drives the motor 12
Control, tracking of the optical head 6, and focus control.

The detailed operation will be described below. When recording an input signal from the outside, a recording command is sent from the keyboard 15 or the external interface unit 14 to the system control unit 10 when the external input signal is received or the operator operates a key. The system control unit 10 sends an input command to the input unit 12 and sends an optical recording command to the optical recording block 7. An input from the outside, for example, an audio or video signal is input to the input unit 12 and becomes a digital signal such as PCM. This signal is sent to the input section 32 of the optical recording block 7, is subjected to error correction coding by the ECC encoder 35, and is passed through the optical circuit 37 to the magnetic recording circuit 29 and the magnetic head circuit 31 in the magnetic recording block 9. Through
The recording magnetic field sent to the magnetic head 8 is applied to the magneto-optical material within the specific range of the optical recording layer 4 according to the optical recording signal. Recording layer 4
The recording material in a narrower range is heated to the Curie temperature or higher by the laser light from the optical head 6, and the magnetization reversal of this portion occurs due to the above-mentioned applied magnetic field. Therefore, as the recording medium 2 rotates, as the recording medium 2 travels in the direction of the arrow 51 shown in the enlarged view of the optical recording head portion in FIG. 2, the magnetization 52 shown by the arrow in the optical recording layer 4 is generated. It is recorded one after another as shown in the figure.

At this time, the system controller 10 controls the optical recording layer 4
The tracking information, address information, and clock information recorded above are obtained from the optical head circuit 39 and the optical reproducing circuit 38, and control information is given to the drive block 11 based on this information. More specifically, the system control unit 10 is the motor 1
By giving a control signal to the motor drive circuit 26, the relative speed between the optical head 6 and the recording medium 2 is controlled to a predetermined linear speed.

The optical head drive circuit 25 and the optical head actuator 18 control the light beam so that it scans a desired track, and also controls the focus so that the optical recording layer 4 is focused. When accessing another track, the actuator 23 and the head moving circuit 24 move the head base 19 to move the optical head 6 and the magnetic head 8 on the head base 19 in an interlocking manner. Therefore, both heads reach the desired front and back tracks at the same radial position. The head lifting unit 20 is driven by a magnetic head lifting circuit 22 and a lifting motor 21,
The magnetic head 8 and the slider 41 are the disk cassette 4
The magnetic head 8 is prevented from being worn away from the magnetic recording layer 3 on the disk surface of the recording medium 2 at the time of loading 2 or during the time when magnetic recording is not performed. As described above, the system control unit 10 sends control information to the drive block 11 to control the tracking of the optical head 6 and the magnetic head 8, focusing, the raising and lowering of the magnetic head 8, the rotation speed of the motor 17, and the like.

Next, a method of reproducing the magneto-optical recording signal will be described. First, using the enlarged view of the optical recording head section of FIG. 2, the laser beam from the issuing section 57 travels in the direction indicated by the optical path 59 by the polarization beam splitter 55 and is focused on the optical recording layer 4 of the recording medium 2 by the lens 54. Tie Focusing tracking control in this case is performed by driving only the lens 54 by the optical head drive unit 18. The magneto-optical material of the optical recording layer is in a magnetized state according to each optical recording signal as shown in FIG. Therefore, the deflection angle of the reflected light shown in the optical path 59a differs depending on the magnetization direction due to the Kerr effect. This polarization angle θ is obtained by splitting the reflected light by the polarization beam splitter 55a, and
Since the magnetization direction can be detected by providing 8, 58a and taking the difference between the two received light signals, the optical recording signal can be reproduced. The operation of reproducing the optical signal is the same as that of the conventional magneto-optical recording and will not be described in further detail. This reproduction signal is sent from the optical head 6 of FIG. 1 to the optical recording block 7, and the ECC is passed through the optical head circuit 39 and the optical reproduction circuit 38.
The error is corrected in the decoder 36, the original digital signal is reproduced, and is sent to the output unit 33. The output unit 33 has a memory unit 34, in which recording signals for a fixed time are accumulated. For example, when a compressed sound signal of 250 kbps is stored using a 1 Mbit IC memory, the signal can be stored for about 4 seconds. When used as an acoustic player, if the tracking of the optical head 6 is lost due to external vibration, the acoustic signal can be removed by recovering within 4 seconds. This method is well known. The signal from the output unit 33 is sent to the output unit 13 at the final stage, and in the case of an acoustic signal, it is PCM demodulated and then output as an analog acoustic signal to the outside.

Next, the magnetic recording mode will be described. In FIG. 1, an external input signal that has entered the input section or a signal from the system control section 10 is sent to the input section 21 of the magnetic circuit block 9, and the EC in the optical recording block 7 is sent.
Encoding such as error correction is performed using the C encoder 35. The encoded signal is sent to the magnetic head by the magnetic recording circuit 29 and the magnetic head circuit 31. This will be described with reference to the enlarged view of the head portion of FIG. Is done. The recording medium 2 has a perpendicular magnetization film.

As the magnetic medium 2 travels in the direction of arrow 51,
As shown in FIG. 3, magnetic signals are recorded one after another according to the magnetic recording signals. The magnetic field in this case is also applied to the magneto-optical recording layer 4, but the coercive force of the magneto-optical recording material below the Curie temperature is several thousand to 10,000 Oe, so it is magnetized unless it is raised above the Curie temperature. And is not affected by the magnetic field of magnetic recording.

However, if the magnetically recorded portion of the magnetic recording layer 3 and the optical recording layer 4 using the magneto-optical recording film are too close to each other, the magnetic field from the magnetic recording portion will occur in the optical recording layer 4 portion. It may reach several tens to several hundreds Oe. For magneto-optical recording under these conditions, when the temperature of the optical recording layer 4 is raised to the Curie temperature or higher by the light beam, the magnetic field from the magnetic recording layer 3 causes magnetization reversal, which increases the error rate during optical recording. Therefore, the thickness of the interference layer 81 is provided between the magnetic recording layer 3 and the optical recording layer 4 as shown in the sectional view of the recording medium in FIG. Since the protective layers 82 and 82a for preventing deterioration are provided on both sides of the optical recording layer 4, the thickness of the interference layer 81 and the sum of the protective layer 82 become the interference interval L. In this case, assuming that the magnetic recording wavelength is λ, the attenuation amount is 56.4 × L / λ, so that setting λ = 0.5 μm is effective if L is 0.2 μm or more. As shown in FIG. 8, the thickness of the protective layer 82 is set to L
Even with the above, the same effect can be obtained. A manufacturing method will be described. A protective layer 82 and an interference layer 81 are formed on the magneto-optical recording layer 4.
The magnetic recording layer 3 is formed by applying a material in which a lubricant, a binder, and a magnetic material having vertical anisotropy such as barium ferrite are mixed by spin coating while applying a magnetic field in the vertical direction. As a result, the recording medium 2 suitable for perpendicular magnetic recording can be obtained as shown in the sectional view of the recording medium in FIG.

The above is the case where the optical recording layer 4 for magneto-optical recording is provided, but the recording / reproducing apparatus 1 of the present invention can also reproduce a ROM disk such as a CD. As shown in the sectional view of the recording medium of FIG. 9, a reflective film 84 of aluminum or the like is formed on the pit portion of the substrate 5 in which pits are engraved by sputtering or the like, and a lubricant, a binder, and a magnetic material are formed thereon. By applying the mixed material to the substrate while applying a vertical magnetic field to form a magnetic recording layer 3 having a perpendicular magnetic recording film, RO
An M-type recording medium 2 is created. This media is a CD RO
Since the function as M is on the front surface and the function as RAM is on the back surface, various effects described later can be obtained. The cost increase in this case is only that the magnetic material is added to the material for forming the protective film by the spin coating which is performed in the present CD. Therefore, the manufacturing cost is increased only by the cost of the magnetic material itself. Since this cost is several tenths of the manufacturing cost of the medium, the cost increase is extremely small.

Tracking during magnetic recording will be described. As shown in FIG. 1, the system controller 10 sends a movement command to the head movement circuit 24 based on the tracking information reproduced from the optical head 6 and the optical head circuit 39, and the actuator 23.
Is driven to move the head base 19 in the tracking direction. Then, as shown in the enlarged view of the head portion only in the tracking direction of FIG. 4, the optical head 6 focuses on the vicinity of a specific optical recording track 65 of the optical recording layer 4. That is, the optical head drive unit 18 that drives the optical head 6 is mechanically coupled to the magnetic head 8 via the head base 19 and the head elevating unit 20. Therefore, the magnetic head 8 moves in the tracking direction in conjunction with the movement of the optical head. That is, if the optical head 6 is controlled to a specific optical track 66, the magnetic head 8
Moves onto a specific magnetic track 67 on the back surface of the optical track 66. Guard bands 68 on both sides of this track,
68a is provided. This is further expanded in Figure 5.
FIG. 3 is an enlarged view of the magnetic head portion of FIG. If the position of the optical head 6 is controlled so as to scan the specific Tn-th optical track 65, the magnetic head 8 travels on the specific Mm-th magnetic track 67 on the back surface.

In this case, only the drive system of the optical head is required, and it is not necessary to separately provide the tracking control means for the magnetic head 8. The linear sensor, which was necessary in magnetic disk drives, is no longer necessary.

Next, a method of accessing the optical track and the magnetic track will be described. The optical head 6 is tracked in conjunction with the magnetic head 8. Therefore, if the optical track information currently being recorded / reproduced from the lower surface is different from the radial position of the magnetic track to be accessed from the upper surface, both cannot be accessed at the same time. In the case of data, only slow access does not cause a fatal problem, but in the case of continuous signals such as audio signals and image signals, interruption is not allowed. Therefore, magnetic recording cannot be performed during normal-speed optical recording / reproduction. In this embodiment, a memory unit 34 is provided in the input unit 32 and the output unit 33, and a method of accumulating a signal for a time several times as long as the maximum access time of magnetic recording is adopted. Therefore, as shown in the timing chart of the magnetic recording of FIG. 6, the rotational speed of the recording medium 2 during recording and reproduction is n
By doubling it, the optical recording / reproducing time T becomes 1 / n of the normal speed and becomes T1 and T2. Therefore, the time T0 which is n-1 times the recording / reproducing time from t = t3 to t = t is the margin time. From t3 to t4 during a part of the spare time T0
Access to the magnetic track during the access time Ta, magnetic recording / reproduction is performed during the recording / reproducing period TR from t4 to t6, and the original optical track or By accessing and returning to the optical track of, the optical recording and the magnetic recording can be time-divisionally accessed by one head moving unit. In this case, the margin period To
During this period, the memory unit 34 is set to have a capacity capable of accumulating continuous signals.

A magnetic recording timing chart of FIG. 6,
Track access of the magnetic head described above will be described with reference to the cross-sectional views of the recording unit shown in FIGS. First, after the cassette 42 shown in the perspective view of the cassette of FIG. 15 is inserted into the recording / reproducing apparatus 1 shown in the perspective view of the recording / reproducing apparatus of FIG. 16, first, as shown in FIG. Optical track 6 in TOC area where information is recorded
The light beam of the optical head 6 is imaged on 5 and TOC
Information is reproduced. At this time, the magnetic head 8 travels on the magnetic track 67 on the back surface, and the magnetic recording information on this track is reproduced. In this way, as the first work, the information of the optical track in the TOC of the recording medium 2 is reproduced, and at the same time, the information of the previous access recorded on the magnetic track, the information at the time of the completion of the last work, etc. are obtained. This content is displayed on the display unit 16 as shown in FIG.

As an example, in the case of acoustic information, the last music number at the end of the previous time, the elapsed time at the time of interruption, the reserved music number, etc. are automatically recorded in the magnetic recording area. Next, when the recording medium 2 is again inserted into the magnetic recording / reproducing apparatus, the magnetic track 67 is added together with the index information of the optical track 65 as described above.
The information at the end of the previous time recorded in the
Is displayed as shown in FIG. In FIG. 16, the last access end time, the operator name, the last song number, the elapsed time at the time of interruption,
This shows the state in which the previously preset song order and song number are recorded and displayed. Specifically, "Contineu?" Is displayed and asked, so if you enter "Yes", music playback will resume from the point where the song with the same song number at the end of the previous time was interrupted. If you enter "No", the music will be played in the preset song order. In this way, the operator can automatically reproduce the contents that were interrupted last time or listen to them in their favorite song order. As shown in the perspective view of the game machine of FIG. 18, this is because a game CDROM device records and reproduces the content of the game that was interrupted last time, for example, the number of stages, the number of acquired points, and the number of reached items, so that a certain amount of time elapses after the game ends. When the user wants to restart the game by restarting the game in the same state from the same place as last time, an effect not obtained in the conventional CDROM type game machine is obtained.

The above is the case of a simple access method for accessing the magnetic track in the TOC area. In this case, the memory capacity is small, but it has the effect of being the simplest and cheapest.

Next, the junction for accessing the tracks other than the TOC area will be described. FIG. 11 shows a state where the optical head 6 is accessing a specific optical track 65a. At this time, the magnetic head 8 interlocking with the optical head 6 causes the optical track 65 to move.
The magnetic track 67a on the back side of "a" is accessed. If the required magnetic recording information is on a magnetic track 67b, which is another track apart from the magnetic track 67a, the magnetic head 8
Need to be moved to the magnetic track 67b. In this case, as described in the timing chart of FIG. 6, it is necessary to complete the movement, recording, and return of the head during the allowance period To. In this case, in the TOC area or the specific area of the optical recording layer 4, the magnetic track NO. And the corresponding optical track No. Is recorded, and this information is read to read the required magnetic track N
O. Optical track NO. Can be calculated. Next, as shown in FIG. 12, the head base 19 is moved during the access time Ta so that the optical head 6 is fixed so as to access the optical track 65b of this optical track number. Then, the magnetic head 8 tracks a predetermined magnetic track 67b. Thus, magnetic recording or reproduction can be performed. In this case, while the optical track 65a is being tracked as shown in FIG. 13, the magnetic head 8 is lifted up by the elevating motor 21 and kept away from the magnetic recording layer, and the motor is moved as shown by ω in FIG. 6 during the access time Ta. Decrease the rotation speed of 17. While the rotational speed is decreasing, the magnetic head 8
Is lowered and brought into contact with the magnetic recording layer 3. This can prevent the magnetic head 8 from being destroyed. During TR, the rotational speed is increased to perform magnetic recording, during Tb, the rotational speed is decreased to raise the magnetic head 8 and, after raising, the rotational speed is increased again to return to the original optical track 65a as shown in FIG. During this period, optical recording / reproduction is performed. Since the data accumulated in the memory 34 is reproduced during this margin time T0, the continuous reading signal such as music is not interrupted. Also, as shown in FIG.
Even if the area C is being accessed, the magnetic head 8 is not lowered if there is an instruction that magnetic recording is not required in the TOC area. As a result, even if the recording medium 2 without the magnetic recording layer 3 is inserted, the accident that the magnetic head 8 is contacted and destroyed can be prevented. In this way, the magnetic head 8
By moving up and down during the period when the rotation speed is lowered, there is an effect that the destruction and friction of the magnetic head can be greatly reduced. FIG. 15 is a perspective view of the cassette 42 that houses the optical recording medium 2. A shutter 88, a magnetic recording prevention claw 89, and an optical recording prevention claw 89a are provided, and recording prevention can be set separately. Of course, the ROM type cassette is provided with only the magnetic recording prevention claw 89a.

FIG. 17 is a block diagram of a recording / reproducing apparatus for reproducing optical recording. The optical recording block does not include the optical recording circuit and the ECC encoder as compared with FIG. Components of the magnetic head elevating part 20, the magnetic head 8 and the magnetic recording block 9 are added as compared to a general reproducing player such as a CD player, but all the components can share the components of the magneto-optical recording / reproducing apparatus of FIG. . Moreover, these costs are much lower than those of optical recording-related parts, so that the cost increase is small. Memory capacity is smaller than floppy,
Since information can be recorded in and reproduced from the ROM type recording medium at such a low cost, the above-described various effects can be obtained in the case of a game machine or a CD player that requires a small memory capacity. According to our calculation, in the case of a disc having a diameter of 60 mm, a memory capacity for magnetic recording of about 1 KB to 10 KB can be obtained by using a magnetic head for magnetic field modulation. Since the current game ROMIC is equipped with SRAM 2KB or 8KB memory, it can be said that it has a sufficient capacity.
It has the effect of replacing OMIC.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 19 is an overall block diagram of the second embodiment. 19 shows the magnetic head 8a shown in FIG. 1 described in the first embodiment.
And a magnetic head circuit 31a are added. Since the other parts are the same, the description is omitted. As in the enlarged view of the magnetic head portion of FIG. 20, first, the magnetic head 8 performs magnetic recording with a long recording wavelength over the entire magnetic recording layer 3, as in the first embodiment. Next, the magnetic head 8a
Performs magnetic recording with a short recording wavelength on the surface layer portion 3a. Then, finally, magnetic recording can be performed on the surface layer portion 3a with an independent channel of a short wavelength subchannel and on the deep layer portion 3b with an independent channel of a long wavelength main channel. As a result, when a long-wavelength magnetic head such as the magnetic head for magnetic field modulation of Example 1 is used to reproduce the magnetic recording layer having two-layer recording as shown in FIG. 20 of Example 2. , The above main channels can be played. Therefore, if the summary information is recorded in the main channel and the detailed information is recorded in the sub channel, the summary information can be obtained even in the method of the first embodiment, and the compatibility between the two can be obtained. The enlarged view of the magnetic head portion of FIG. 21 shows a case where only the short wavelength magnetic head 8 is mounted. In this case, the signal in which the main channel is superimposed on the above-mentioned sub-channel signal is reproduced, and both the main and sub channels are reproduced. Since the data can be reproduced, the cost can be reduced by adopting this configuration in the case of a reproduction-only machine. In the enlarged view of the magnetic head portion of FIG. 22, the upper part of the drawing is a magnetic field modulation head, that is, the case where recording is performed by the magnetic head 8 suitable for a long wavelength.
If the non-magnetized portion is 0, the magnetized regions 1 and 120a are 12
0 is recorded at 0b and 1 is recorded at 120C, and a data string 121 of "101" is obtained. As shown in the lower part of the figure, assuming that the N pole portion is 1 and the non-magnetized portion is 0 using the perpendicular magnetic head 8b suitable for a short wavelength, the data string 122 indicates "101".
10110 ", which is the same area 1 as the upper area 120a
8 bits can be recorded in 20d. When the signal of this area 120d is reproduced by the magnetic head 8, only the N pole is present, so "1"
To judge. This is the same as the area 120a. That is, "1" in the data string 122a can be reproduced. Next, in the region 120e, the S pole portion is "0" and the non-magnetized portion is "1".
If you define, "0100101"
0 "and 8 bits are recorded. When this is reproduced by the magnetic head 8, it is judged as" 0 "because it has only the south pole.
It is a signal having the same polarity as that of the region 120b is reproduced with a slightly weaker amplitude. Therefore, as shown in FIG. 22, in the magnetic head 8b for short wavelength, the data string 122a of the main channel D1 is used.
And the signal of the data string 122 of the sub-channel D2 are recorded and reproduced, and the magnetic head 8 for long wavelength for magnetic field modulation reproduces the data string 122a of the main channel D1.
The effect that both are compatible can be obtained. The gap of the magnetic head 8 for magnetic field modulation is 0.2 to 2 μm.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 23 is an enlarged view of the recording portion of the third embodiment.
In the third embodiment, first, on the transparent substrate 5 of the recording medium 2, the reflective film 8 having the pits as shown in FIG.
4 and the magnetic recording film 3 are the same, but C
0-Ferrite is formed by plasma CVD or the like. Since this material has a light-transmitting property, it has a high light-transmitting property when the thickness is thin.

As shown in FIG. 23, a focus 66 is formed on the medium from the back side by the optical head 6. The lens 54 of the optical head 6 is connected to the slider 41 made of a light transmitting material by a connecting portion 150 having a spring effect. Further, the magnetic head 8 is embedded in the slider 41. Therefore, the optical head reads the pits of the reflective film 84 from the back side, and tracking and focus are controlled. Then, the slider connected to this is subjected to tracking control and travels on a specific optical track. The positional error between the lens 54 and the slider 41 is generated only by the spring effect of the connecting portion 150, so that the slider 41 is controlled in the order of microns. Next, since the up and down direction is interlocked with the focus control, it is controlled in the order of several microns to several + microns.

Then, magnetic recording is successively performed on the magnetic recording layer 3. In the case of the present embodiment, since optical tracking is possible, there is a great effect that a track pitch of several microns can be realized. Further, since the slider 41 and the magnetic head 8 are controlled in the vertical direction by the focus control, they follow the surface accuracy of the substrate 5 of the recording medium 2 even if it is poor. For this reason, since a substrate having poor surface accuracy can be used, there is an effect that a plastic substrate or a non-polished glass substrate, which is much lower in cost than a polished glass substrate, can be used.

Further, FIG. 23 shows the case of reproducing from the back surface of the recording medium 2 by the optical head 6. However, since it is possible to reproduce the same recording medium from the surface by a mechanism like a conventional optical disk player, there is an effect of compatibility. Then, there is a remarkable effect that a memory capacity larger than that of the conventional one by one digit or more can be obtained by the optical tracking.

(Embodiment 4) A fourth embodiment of the present invention will be described below with reference to the drawings.

FIG. 24 shows a block diagram of the recording / reproducing apparatus of the fourth embodiment. The fourth embodiment has the same configuration and basic operation as the recording / reproducing apparatus of FIG. 1 described in the first embodiment. Therefore, detailed description is omitted and only different parts will be described.
The difference between the fourth embodiment and the first embodiment is that in the first embodiment, the magnetic head 8 uses the magneto-optical recording magnetic field modulation head as it is, so that the perpendicular recording is performed as shown in FIG. On the other hand, in the fourth embodiment, as shown in the enlarged view of the magnetic recording portion in FIG. 25, the magnetic recording layer of the recording medium 3 is used by using the magnetic head 8 having two functions of magnetic field modulation for magneto-optical recording and horizontal magnetic recording. Three
Horizontal recording is performed. The equivalent head gap of the magnetic field modulation head of the first embodiment, for example, the MD head, is usually 100.
Since it is as large as μm or more, the recording wavelength λ becomes a long wavelength of several hundred μm. In this case, a demagnetizing field is generated and the magnetic charge actually recorded is attenuated, so that the reproduction output is lowered. The first embodiment has an extremely great advantage that the cost does not increase because no configuration change is required, but has a disadvantage that the reproduction output decreases.

Horizontal recording is more suitable when high reproduction output is required for long wavelength recording. In order to realize the horizontal recording, the fourth embodiment basically changes the recording system from the vertical recording to the horizontal recording by changing the configuration of the magnetic head in the first embodiment. As shown in FIG. 25, the magnetic head 8 of the fourth embodiment has a main pole 8a that also functions as a magnetic head for magnetic field modulation, a sub-pole 8b for forming a closed magnetic path, and a head gap 8c having a gap length L and a coil. It consists of 40. This magnetic head 8 can be regarded as a ring head having a gap length L during horizontal recording. In addition, when magnetic field modulation type magneto-optical recording is performed, a uniform magnetic field is applied to the optical recording layer 4. First, in the magnetic recording mode shown in FIG. 25, the optical head 6 focuses on the optical recording layer 4 to read track information or address information, and the optical head 6 controls so that the focus 66 of a predetermined optical track tracks. To be done. Along with this, the magnetic head 8 connected to the optical head 6 also runs on a predetermined magnetic track.
FIG. 25 is a view as seen from the direction perpendicular to the traveling direction. As the recording medium 2 travels in the direction of arrow 51, the magnetic recording block 9
Horizontal magnetic recording signals 61 are successively recorded on the magnetic recording layer 3 in accordance with the recording signals sent from the magnetic recording layer 3. If the gap length is L and the recording wavelength is λ, then λ> 2L. Therefore, the smaller the gap length L, the larger the recording capacity can be.
However, when L is made small, the range of the uniform magnetic field becomes narrow when the modulating magnetic field for magneto-optical recording is generated. For this reason, the recordable range of the focal point 66 of the optical head becomes narrower, and the dimensional accuracy of the recording medium and the tracking mechanism must be increased, which increases the cost. As shown in the enlarged view of the magneto-optical recording in FIG. 26, when performing the magneto-optical recording, the laser light from the optical head 6 heats the focal point 66 of the optical recording layer 4 to reach the Curie temperature or higher. Then, the modulation magnetic field 8 by the magnetic head 8
The portion of the focal point 66 of the optical recording layer 4 is magnetized in the same direction as the magnetic field direction of 5, and the optical recording signals 52 are recorded one after another. In this case, the positional relationship between the optical head 6 and the magnetic head 8 facing each other depends on the dimensional accuracy of the tracking mechanism such as the head base 19 as described above. In the case of MD, the standard of dimensional accuracy is loose to reduce the cost. Therefore, in consideration of the worst condition, the positional relationship between the optical head 6 and the magnetic head 8 may be greatly changed. Therefore, the range of the uniform magnetic field region 8e is required to be as wide as possible. Therefore, as shown in FIG. 26, by providing the narrowed portion 8d on the main magnetic pole portion 8a of the magnetic head 8, the magnetic fluxes 85a and 85b on the right side are converged and the magnetic field is strengthened. Therefore, the magnetic flux 85c, 85d, 85e, 85f
And has the effect of expanding the uniform magnetic field region 8e. In this way, even if the relative positional relationship between the optical head 6 and the magnetic head 8 is deviated and the relative position between the focal point 66 and the magnetic head 8 is deviated, an optimum modulation magnetic field is obtained when the focal point 66 is within the uniform magnetic field region 8e. , The magneto-optical recording is surely performed, and the error rate is not deteriorated.

Further, as shown in the enlarged view of the magneto-optical recording section of FIG. 31, the magnetic flux of the magnetic recording signal 61 of the magnetic recording layer 3 is the magnetic flux 8.
6a, 86b, 86c, 86d. Therefore, at the time of magneto-optical recording, the magnetic field of the magnetic flux 86a due to the magnetic recording signal 61 and the magnetic head 8 are applied to the magneto-optical recording material at the focal point 66 portion of the optical recording layer 4 which has reached the Curie temperature or higher due to the focal point 66.
Two magnetic fields of the modulation magnetic field from are added. If the magnitude of the magnetic field of the magnetic flux 86a is larger than the magnitude of the modulating magnetic field from the magnetic head 8, the magneto-optical recording by the modulating magnetic field in this portion will not operate normally. Therefore, it is necessary to suppress the magnitude of the magnetic flux 86a to a certain value or less. Therefore, the interference layer 81 having the thickness d is provided between the magnetic recording layer 3 and the optical recording layer 4 to reduce the influence. When the shortest recording wavelength of the magnetic recording signal 61 is λ, the strength of the magnetic flux 66 in the optical recording layer 4 is attenuated by about 54.6 × d / λ. In the case of a recording medium, various recording wavelengths λ can be used. Λ = 0.5μ for the shortest recording wavelength
m is common. In this case d is 60 if 0.5 μm
Since the attenuation is about dB, the influence of the magnetic recording signal 61 is almost eliminated.

From the above, the effect of eliminating the influence of the magnetic recording signal on the magneto-optical recording by using the interference film of at least 0.5 μm for the magnetic recording layer 3 and the magneto-optical recording layer 4 of the recording medium 2. Is obtained. In this case, the interference film is made of a non-magnetic material or a magnetic material having a small holding force.

When performing magneto-optical recording and magnetic recording using a magneto-optical recording medium, if the modulating magnetic field of the magneto-optical recording is sufficiently smaller than the coercive force of the magnetic material of the magnetic recording layer, the modulating magnetic field is recorded in the recorded magnetic signal. There is no possibility of damage. However, when the ring head is used as in Example 4, a strong magnetic field is generated in the head cap portion. Therefore, even if the modulation magnetic field is weak, the magnetic signal may be affected and the error rate may increase. In order to avoid this, when a magneto-optical recording medium is mounted for recording, as shown in the sectional view of the recording portion of FIG. 27, the optical recording is planned before the main recording signal is recorded on the optical recording layer by the optical head 6. The magnetic recording signal recorded on the magnetic track 67g on the back surface of the optical track 65g in the area is transferred to the memory section 34 of the recording / reproducing apparatus or the optical recording layer and saved. By saving, there is no problem even if the data in the magnetic recording layer is destroyed by the modulating magnetic field during magneto-optical recording.

This will be specifically described with reference to the flowchart of FIG. The flow chart is roughly divided into six. The discriminating step 201 discriminates the attribute of the disc, and in the case of the optical ROM disc, the reproduction only step 20
4 is used. When reproducing the optical RAM disk, a reproducing step 202 and, if necessary, a reproducing / transferring step 203 are performed. When recording on an optical RAM disk, a recording step 205 and optionally a recording / transcription step 206 are used. If there is free time, only transcription is performed in transcription step 207.

This flowchart will be described in detail. In the determination step 201, the recording medium 2, specifically a disc, is loaded in step 220. In step 221, the disc type, for example, ROM or RAM,
The distinction between the magneto-optical medium, the optical recording prohibition, the magnetic recording prohibition, and the like is discriminated by a claw or the like engraved on the cassette of the disk in FIG. Next, in step 222, the optical head 6 is moved to the positions of the innermost optical track 65a and magnetic track 67a in FIG. In step 223, each data of the optical information and magnetic information of the TOC is read out, and data such as the music number at the end of the previous time for a music disc and the end stage number of the game for a game disc are entered. Based on this, as shown in FIG. 16, if the user desires to continue, the state at the end of the previous time can be restored. Magnetic TOC in step 224
The untranscribed flag written in is read. If the untranscribed flag = 1, it means that the magnetic data that has not been transcribed remains in the optical data section. Further, if the untransferred flag = 0, it means that there is no transfer flag. In step 225, it is discriminated whether the disc is a magneto-optical disc or a ROM disc. If the disc is a ROM disc, the process goes to step 238.
Go to 6. If there is a reproduction command in step 238, the optical recording signal and the magnetic recording signal are reproduced in step 239, and if the operation is completed in step 240, step 24
1 shows various changes that occurred during the playback period, for example, changes in the playback song order and the song number at the end time.
Write in the area etc. After the writing is completed, the disc is ejected at step 242.

Now, return to the case of the magneto-optical disk in step 226. If there is a reproduction command, the process proceeds to step 227, and if not, the process proceeds to step 243. In step 227, the reproduction of the main recording signal on the optical recording surface is performed faster than the normal reproduction speed, and the signals are sequentially stored in the memory. In the case of a music signal, in order to be able to store data for several seconds, the music is not interrupted even if the reproduction is interrupted during this period. When the memory becomes full in step 228, the unposted flag = 1 in step 229.
In the case of, the reproduction of the main recording signal is interrupted, and the process proceeds to step 230 in the reproduction transcription step 203. Check if all sub-recording signals on the magnetic recording surface have been played back.
If so, the process proceeds to step 234, and if No, the process proceeds to step 231, where the sub-recording signal on the magnetic recording surface is reproduced and stored in the memory. In step 232, it is checked whether the main recording signal in which the music signal or the like is accumulated can be output. If No, the process returns to step 227 to reproduce and accumulate the main recording signal. If Yes, when the sub recording signal reaches the set memory amount in Step 233, it is checked again in Step 234 whether the main recording signal can be accumulated and reproduced, and if Yes, the sub recording signal stored in the memory in Step 235. Is transferred to the transfer area of the optical recording surface, and it is checked in step 236 whether transfer of all data is completed. If No, step 23
The transfer is continued by returning to 0, and if Yes, the untransferred flag is changed from 1 to 0 in step 237 and the process returns to step 226.

When recording on the optical recording layer, the process proceeds to step 243 in the recording step 205 to check the recording command, and if Yes, the main recording signal is stored in the memory in step 244 and optical recording is not performed. In step 245, it is checked whether there is enough memory. If No, step 2
Optical recording of the main recording signal is performed at 45a, and the process returns to step 243. If Yes, the process proceeds to step 246. If the untranscribed flag is not 1, the process returns to step 243. If the flag is 1, the process proceeds to step 247 in the record transcription step 206. In step 247, the main recording signal is stored in the memory and at the same time the optical recording is planned to be performed this time.
The sub-recording signal of the magnetic track 67g on the back side of is reproduced and stored in the memory. In step 248, it is confirmed whether or not the main recording signal storage memory has a margin. If Yes, step 248a
If the sub recording signal is transferred to the optical recording layer at No, the process returns to step 245a to perform optical recording. In step 249, confirm whether the transfer of all data has been completed. If Yes, step 25
At 0, the unposted flag is changed from 1 to 0, and step 243
Return to. If No, the process is returned to step 243 without any change.

In step 243, it is checked whether or not there is a recording command, and if No, step 25 in the transfer step 207.
Go to 1. Since neither recording nor reproducing of the main recording signal is required here, only the sub recording signal of the magnetic data surface is transcribed to the optical data surface. In step 251, the sub recording signal is reproduced and stored in the memory, and in step 252, it is transferred to the optical recording layer. Check whether all postings are completed in step 253,
If No, the process returns to step 251 again to continue transcription. Ye
If s, in step 254, the unposted flag is changed from 1 to 0, and in step 255, it is checked whether or not all the operations have been completed.
Then, the process returns to the first step 226. If Yes, the process proceeds to step 256, the information changed in this work and the information that the untransferred flag = 0 is magnetically recorded in the TOC area of the magnetic track, and the disc is ejected in step 257 to perform the work concerning this one disc. Complete.

In step 256, the magnetic recording layer can be restored to the state before the optical recording by writing all the sub-recording signals accumulated in the memory into the magnetic recording layer again.

As described above, among the data on the magnetic recording surface, the data of only the magnetic track which is destroyed by the modulation magnetic field of the optical recording is saved in the memory or the optical recording surface, thereby substantially destroying the data on the magnetic recording surface. It has the effect of preventing it.

Furthermore, after the optical recording operation is completed, the saved data is recorded again on the magnetic track and restored, so that even if magneto-optical recording is performed, the data on the magnetic recording surface is restored when the disc is ejected.

In the case of FIG. 28, a method is used in which data having a possibility of destroying the magnetic recording surface is transferred onto the optical recording surface before the magneto-optical recording. On the other hand, FIG.
In the case of the flowchart of (1), the method of not transcribing to the optical recording surface is used. The determination step 201, the reproduction step 202, and the reproduction-only step 204 in the flowchart of FIG.
28 is the same as that in FIG. 28, and therefore its description is omitted. Further, since the transcription is not performed, the reproduction transcription step 203, the recording transcription step 206, and the transcription step 207 are unnecessary. Only the recording step 205 is different and will be described in detail below.

Step 226 in the reproduction step 202
Check if there is a playback command and if No, step 2
64. If Yes, go to step 260. In step 260, the optical track corresponding to each magnetic track is managed, the applicable magnetic track destroyed by the magneto-optical recording on the back surface of the optical track is calculated, and it is checked whether it is the same applicable track as the one saved the last time Yes. Then, in step 263, magneto-optical recording is performed on the optical track. N
If it is o, the previous magnetic track data can be completely restored by writing the save data to the previous magnetic track in step 261. Next, at step 262, the data of the corresponding magnetic track to be destroyed this time is read and saved in the memory. After that, recording is performed on the optical track in step 263, and the process returns to step 243. No in step 243
In step 261a, the previous magnetic track is restored, and in step 264 of the end step 206, it is checked whether the operation is completed. If No, the process returns to step 226, and Y
If it is es, in step 265, information changed from the mounting of this disc to the end thereof, for example, the ending music number of music is magnetically recorded. Then, in step 266, the disc is ejected.
In this way, the work is finished, and when the next disc is loaded, the work is started again from step 220.

In the case of FIG. 28, all the magnetic data is transferred to the optical recording layer so that the magnetic data may be destroyed by the optical recording, whereas in the case of FIG. The data is managed, and only the magnetic data of the corresponding magnetic track that is to be destroyed by magneto-optical recording is stored in the read memory, and that magnetic track is destroyed by magneto-optical recording, and is a magnetic track different from the corresponding magnetic track This magnetic track is completely restored at the time of optical recording on the disk. As a result, the memory capacity for magnetic tracks of 1 to 3 can be dealt with, and the memory can be reduced. As is clear from the flowchart, magnetic data can be protected from destruction of magneto-optical recording by simple processing.

As shown in the sectional view when the magneto-optical disk is mounted in FIG. 30A and the sectional view when the CD is mounted in FIG. 30B, the same mechanism is used to reproduce the magneto-optical disk and the CD. You can also In this case, in the case of a CD, since the outside is not protected by the cartridge, it is easily affected by external magnetism. For example, the coercive force of the magnetic recording layer 3 of the CD is 1000 to 3
000 Oe, which is much higher than the magnetic recording layer of the magneto-optical medium, has the effect of preventing the destruction of magnetic data by an external magnetic field. In the case of a magneto-optical disk, if the coercive force is increased, the magnitude of the modulating magnetic field in the magneto-optical recording layer approaches, so that the influence is exerted. Therefore 1000
It is lower than Oe.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. 32 is a block diagram of the recording / reproducing apparatus of the fifth embodiment. The fifth embodiment has the same configuration and basic operation as those of FIGS. 1 and 24 described in the first and fourth embodiments. Therefore, detailed description is omitted and only different parts will be described. The difference between the fifth embodiment and the first embodiment is that in the fourth embodiment, magnetic recording, reproduction of a magnetic recording signal, and magneto-optical recording are performed by the ring type magnetic head 8 having one coil 40 as described with reference to FIGS. This is a system in which one coil performs the three functions of generating a modulated magnetic field for use.
For this reason, the structure is simple, but there are contradictory elements in order to make the three compatible, and there is a possibility that problems such as reduction in reproduction efficiency and narrowness of the uniform magnetic field region occur. Therefore, it is difficult to design the head and also difficult to process.

That is, since the wiring circuit is simple because of the simple structure, it is difficult in terms of design and processing.

In view of this point, the fifth embodiment has two coils, that is, a magnetic field modulation coil 40a and a magnetic recording coil 40b, as shown in an enlarged view of the magnetic recording of FIG. Returning to the block diagram of FIG. 32, at the time of magnetic recording or reproduction, the magnetic head circuit 31 applies a current to the magnetic recording coil 40b or receives a current from the coil to perform magnetic recording and reproduction.

When performing magnetic field modulation type magneto-optical recording,
A magnetic field modulation circuit 37a in the optical recording circuit 37 applies a modulation signal to the magnetic field modulation coil 40a to perform magneto-optical recording.

The operation during magnetic recording and reproduction will be described with reference to FIG. The recording current from the magnetic head circuit 31 flows through the coil 40b in the arrow direction. Then the magnetic flux 86c, 8
A closed magnetic circuit of 6a and 86b is formed, and the magnetic recording signal 61 is recorded in the magnetic recording layer 3 one after another. Horizontal magnetic recording is used. In this case, basically no current flows through the magnetic field modulation coil 40a. With this structure, a closed magnetic circuit including the gap 8c is formed, and the reproduction sensitivity can be optimally designed.

Next, the operation during magneto-optical recording will be described with reference to the enlarged view of magneto-optical recording in FIG. Magnetic field modulation coil 4
0a is wound in the same direction on both the main magnetic pole 8a and the auxiliary magnetic pole 8b of the yoke. Therefore, when the modulation current flows from the magnetic field modulation circuit 37a in the direction of the arrow 51a, downward magnetic fluxes 85a, 85b, 85c, 85d are generated. The magnetization of the magneto-optical recording material having a Curie temperature or higher at the focal point 66 of the optical recording layer 4 is reversed by this magnetic field, and the optical recording signal 52 is recorded. In this case, the strength of the magnetic field at the focal point 66 is generally 5 in the range of the uniform magnetic field region 8e.
It is set to 0 to 150 Oe. In this case, as shown in FIG. 25, it is preferable to provide the interference layer 81 so that the magnetization of the magneto-optical recording material is not reversed by the magnetic recording signal 61. If this thickness is d, then λ> d. With the configuration of FIG. 34, the effect that the uniform magnetic field region 8e can be widened is obtained. Further, since the head can be designed independently for the two coils, there is an effect that the optimum magnetic field modulation characteristic, the optimum magnetic recording characteristic and the optimum magnetic reproducing characteristic can be obtained. Since the head gap 8c in FIG. 33 can be reduced, the wavelength during magnetic recording can be shortened. In addition, since the optimum design for forming the closed magnetic circuit can be performed, the reproduction sensitivity is also improved. Further, as shown in FIG. 34, when the magnetic field is modulated, the magnetic flux 8 of the main pole 8a is
The magnetic flux 85d of the auxiliary magnetic pole 8a and the magnetic flux 85d of the auxiliary magnetic pole 8b are in the same direction.
A strong magnetic field is not generated in the gap portion 8c unlike the case. Only a weak magnetic field of the modulating magnetic field is generated. The coercive force of the magnetic recording layer 3 is 800 to 1500 Oe, which is sufficiently higher than that of the modulation magnetic field and has an easy axis of magnetization in the horizontal direction, so that the magnetic recording signal 61 is not destroyed by the modulation magnetic field. Therefore, in Example 4, data is not destroyed by making the coercive force Hc of the magnetic recording layer 3 higher than the recording magnetic field Hmax of the magneto-optical recording material. In this case, since it is sufficient to double the margin, Hc <2Hmax. The recording medium 2 shown in FIG. 8 may be manufactured. Further, in the magnetic head 8, as shown in FIG. 35, the coil 40a can be independently wound around the main magnetic pole 8a and the coil 40b can be independently wound around the auxiliary magnetic pole 8b. In this case, at the time of magnetic field modulation, a magnetic flux 85d is generated by applying a modulation current in the direction of arrow 51b to the magnetic recording coil 40b using the magnetic head circuit 31, and the magnetic fluxes 85c, 85b, 85 generated by the magnetic field modulation coil 40a.
This is in the same direction as a, and the same effect as in FIG. 34 is obtained.

Also, wind one winding as shown in FIG.
By providing the tap 40c, two coils can be configured with three terminals. The taps 40c and 40e are used during magnetic recording.

Further, at the time of magneto-optical recording, a modulating magnetic field for magneto-optical recording can be generated by using the taps 40d and 40e as shown in FIG. As a result, the head can be configured with three taps, which has the effect of simplifying the wiring.

(Embodiment 6) A sixth embodiment of the present invention will be described below with reference to the drawings. FIG. 38 is a block diagram of the recording / reproducing apparatus of the sixteenth embodiment. The sixth embodiment is the first and fourth embodiments, and particularly the fifth embodiment, and the basic operation is the same as that of FIGS. 1 and 24 and 32 described above.
Therefore, detailed description is omitted and only different parts will be described. The difference between the sixth embodiment and the fifth embodiment is shown. In the fifth embodiment, one coil is provided separately from the magnetic modulation coil to perform magnetic recording. Therefore, degaussing and recording cannot be performed at the same time. However, the floppy disk requires simultaneous operation. Therefore, in the sixth embodiment, as shown in FIG. 38, the magnetic head 8 is provided with two gaps 8c and 8e. Further, two coils 40b and 40f are connected to the magnetic head circuit 31, one of which is used for recording and the other of which is used for degaussing. In this way, degaussing and recording can be performed simultaneously with one head.

Next, an enlarged view of the magnetic recording portion of FIG. 39 shows a concrete structure of the magnetic head 8. As shown in FIG. 33, in addition to the auxiliary magnetic pole 8b, a second auxiliary magnetic pole 8d is added. As described with reference to FIG. 33, the magnetic recording coil 4
0b for magnetic recording, but before that, the second auxiliary pole 8d
Thus, a degaussing current is made to flow from the magnetic head circuit 31. Thus, the magnetic recording layer 3 can be demagnetized in the gap 8e before recording. Therefore, when magnetic recording is performed in the gap 8c, ideal recording can be performed, and C / N, S / N
Is improved and the error rate is reduced. The top view of the magnetic recording portion in FIG. 41 shows this state as viewed from the vertical direction of the recording medium 2. As shown in FIG. 41, guard hands 67f and 67g are provided on both sides of the recording track 67. First, degaussing is performed with the width of the degaussing region 210 by the gap 8e of the second auxiliary magnetic pole 8d. Therefore, the entire area of the recording track 67 and the guard bands 67f and 67g are
A part of the area is demagnetized. Therefore, the gap 8c does not deviate from the degaussing region 210 even if the magnetic head 8 is displaced from the track. Therefore, when magnetic recording is performed using the gap 8c, recording can be performed in a good state.

As shown in the top view of the magnetic recording portion of FIG. 42, the degaussing gap is divided into gaps 8e and 8h.
It is also possible to provide two. As a result, the recording medium 2 is made to travel in the direction of the arrow 51 in the opposite direction in FIG. And record. The overlapping portion is demagnetized by the two degaussing regions 210a and 210b. Therefore, the guard bands 67f and 67g are completely secured. As a result, crosstalk between recording tracks is reduced, and the error rate is reduced. Next, a case where the magnetic head 8 is used to perform magnetic field modulation of the magneto-optical recording will be described with reference to an enlarged view of the magnetic field modulation unit in FIG. Since the magnetic field modulation coil 40a is wound around the main magnetic pole 8a, the sub magnetic 8b, and the second sub magnetic 8d, the magnetic fluxes 85a, 85b, 85c, 85d, and 85e are evenly generated in each magnetic pole. Therefore, there is an effect that a wide uniform magnetic field region 8e can be obtained. For this reason, even if the dimensional accuracy of the track position is low, the focal point 66 cannot deviate from the optical recording track 65.

Next, in the magnetic head 8 shown in the enlarged view of the magnetic recording portion in FIG. 43, the winding method of the coil of the magnetic head 8 described in FIG. 39 is changed. As shown in the figure, the magnetic field modulation coil 40d is extended to serve also as a magnetic recording coil, and an intermediate tap 40c is provided. Thereby, magnetic recording can be performed by the taps 40c and 40e. Further, as shown in an enlarged view of the magnetic field modulation unit 44 in FIG. 44, currents in the directions of the arrows 51a and 51b are made to flow through the taps 40d and 40e by causing the arrows 51c to flow through the tap 40f, whereby magnetic fluxes 85a, 85b, 85c in the same direction, 85d,
85e is generated and a uniform modulation magnetic field is generated. In this case, there is an effect that the number of taps is reduced by one and the configuration is simplified. As described in detail above, by using the magnetic head 8 of the sixth embodiment, there is a great effect that one head can share the degaussing head, the magnetic recording head, and the magnetic field modulation head for magneto-optical recording.

(Embodiment 7) A seventh embodiment of the present invention will be described below with reference to the drawings. The seventh embodiment mainly relates to a disk cassette for storing a medium. The top view of the disc cassette in FIG. 45A shows a state in which the movable shutter 301 of the disc cassette 42 is closed. Thus, not only the head hole 302 but also the liner holes 303a, 303b, and 303c are protected by the shutter 301, so that there is an effect that dust does not enter. As shown in FIG. 45 (b), the shutter opens as the disc cassette 42 is inserted into the main body in the direction of arrow 51. Therefore, the head hole 302 and the liner holes 303a and 303
Both b and 303c open. As shown in FIG. 46, the rectangular unit 1
The liner hole 303 may be provided. 47 and 48
Head hole 302 as shown in the top view of the disk cassette
You may provide the liner hole in the opposite direction. In this case
As shown in the top views of the liners 9 (a), 9 (b), and 9 (c), the liner 304 and the liner support 305 made of a leaf spring or a plastic sheet and the liner support plate-equipped part 3 are shown.
According to 06a-d, the liner has a movable liner portion 305a.
The other parts are fixed to the disc cassette 42. Figure 4
As shown in FIG. 9C, the liner groove 307 is dug in the cassette half. In this groove 307, the liner movable part 3
05a is stored. From above the sub liner support 30
5b holds it down. Thus, the liner support portion 305a
Due to the restoring force of the spring, it keeps a flat plate state unless external force is applied. In this state, the liner 303 does not contact the recording layer on the surface of the recording medium 2. For this reason, the wear of the recording layer 3 is normally prevented.

Next, when an external force is applied from the liner hole 303 toward the inside of the disc cassette 42 by the liner pin 310 as necessary, the liner support portion 305 and the liner 304 are pressed against the medium surface. The recording layer of the recording medium 2 does not contact with 305.

Another structure of the disc cassette is shown in FIGS. 50 (a), (b) and (c), in which the leaf spring of the liner support portion 303a is preliminarily deformed in the upper direction of the disc cassette as shown in FIG. 50 (c). Keep it. As a result, when it is fixed to the disc cassette 42 as shown in FIG. 50 (d), it is constantly pressed against the cassette half upper portion 42a. Therefore, the recording medium 2 and the liner 304 do not come into contact with each other unless they are pushed downward by the liner pin 310. Sub liner support 3
The effect that 05b can be omitted is stably obtained.

Next, a method of switching the contact between the liner and the disc with the liner pin 310 will be described.
FIG. 51 is a sectional view taken along the line AA ′ of FIG. 49 (a). The liner pin 310 is pulled up in the liner pin guide 311 in the direction of arrow 51a. Therefore liner 3
04 and the recording layer 3 of the recording medium 2 are not in contact with each other. Therefore, since the frictional force when the recording medium 2 is rotated is small, the recording medium 2 can be rotated even with a weak driving force. Next, when the liner pin 310 is pushed down by an external force in the direction of arrow 51 as shown in FIG. As the recording medium 2 rotates or runs in the direction of arrow 51,
Foreign matter such as dust and dirt on the magnetic recording layer 3 is removed by the liner 304 made of a non-woven fabric or the like. Therefore, when magnetic recording / reproducing or magnetic field modulation of magneto-optical recording is performed by the recording head 8 in the head hole 301 portion of FIG. 46, the effect that the error rate is greatly reduced can be obtained. The material of the liner is the same as that of the conventional floppy liner, so the description thereof will be omitted. In this case arrow 5
In the case of the rotation direction shown by 1a, as shown in FIG.
Since 0 is provided, there is an effect that the cleaning effect is enhanced. In this case, even if the liner control system of the present invention is used for the contact type magneto-optical recording disk cassette 42 in which the ordinary magnetic recording layer 3 is not provided, dust is reduced and the error rate during magneto-optical recording is improved. The effect is obtained.

The control of the liner pin 310 is shown in FIG. 52, for example.
As shown in (b), the magnetic head 3 and the liner pin 310.
When the magnetic head 3 comes into contact, the liner 304 always comes into contact with the recording medium 2 so that the actuator can also be used. If the magnetic head 3 is not in contact, the liner pin 310 may be used as necessary.
To prevent the liner 304 from touching. As shown in the elevation view of the magnetic head in FIG. 53a, when the magnetic head 8 is interlocked, the liner 304 and the recording medium 2 do not come into contact with each other. This prevents the surface of the magnetic recording layer 3 from being worn by the liner 304 when unnecessary. At the same time, since the frictional force is reduced, the rotation torque of the motor is small and the power consumption is reduced. Even if the disk cassette 42 of the present invention is mounted on a conventional recording apparatus that does not support the magnetic recording method of the present invention, FIG.
As shown in the magnetic head ascending / descending diagram of (b), since the conventional apparatus does not have the liner pin 310 and the ascending / descending function, the liner 304 and the recording medium 2 are not in contact with each other as shown in FIG. Even a conventional magneto-optical recording / reproducing apparatus with a small torque can be stably rotated. Therefore, there is an effect that the compatibility between the medium and the conventional device is maintained. Even if the conventional disk cassette 42 without the liner 304 or the liner hole 303 is mounted on the recording / reproducing apparatus of the present invention, the liner hole 303 is not formed as shown in the magnetic head elevation views of FIGS. Because there is no liner pin 3
10 is not inserted. Therefore, recording media 2 and liner 3
The liner pin 310 does not contact 04. Therefore, even if the conventional medium is inserted into the recording / reproducing apparatus of the present invention, the problem does not disappear at all, and there is an effect that compatibility between them is maintained. In this case, the lubricant of the conventional recording medium adheres to the contact surface of the magnetic head 8 and the error rate deteriorates. In order to prevent this, a cleaning track 67x is set as shown in the top view of the recording medium of the present invention in FIG. When the recording medium 2 of the present invention is loaded into the recording / reproducing apparatus of the present invention and the recording medium 2 of the present invention is inserted after being detached, the insertion magnetic head 8 is first run over the cleaning track 67x at least once. . As a result, the above-mentioned dust adheres to the cleaning track 67x. The dust is further in contact with the recording medium 2. Removed by liner 304. As a result, dust on the contact surface of the magnetic head 8 is finally removed, and there is an effect that reliable recording and reproduction with a low error rate can be performed. 57 (a) (b)
The cross-sectional views of the liner lifting part of each of the liner pins are OFF
And the state of ON. 58. FIG. 59 is a sectional view of the liner lifting / lowering portion as viewed in the running direction of the recording medium 2 shown in FIGS. 51 and 52, respectively.

Next, an embodiment using a leaf spring type liner pin 310 will be described. The cross-sectional views of the liner pin portion of FIGS. 60 and 61, the front cross-sectional views of the liner pin portion of FIGS. 62 and 63 are full cross-sectional views of the liner pin portion of the leaf spring, and the liner pin 310 of the leaf spring is used. The OFF state and the ON state are shown respectively. In this case, the liner pin 310 is the pin driving lever 31.
It is driven in the directions of arrows 51 and 51a by the lifting motor 21 via 2 and turned on and off. The front sectional views of the liner pin shown in FIGS. 64 and 65 respectively show an OFF state and an ON state when the liner pin 310 is used when the rectangular one-hole liner hole 303 shown in FIG. 46A is used. In this case, there is an effect that the contact area of the liner pin with the liner mounting portion is increased and dust can be reliably removed.

In the front sectional views of the liner pin shown in FIGS. 66 and 67, the liner guide 311 is provided with a protective portion 311a. Further, as shown in FIG. 66, the disc cassette 42 of the present invention
Also, a recognition hole 313 is provided. Therefore, when the disc cassette 42 of the present invention is inserted as shown in the figure, the liner pin 310 is inserted into the liner hole 303. However, the conventional disc cassette 42 without the recognition hole 313
67, the protective film 314 hits the case of the disc cassette 42 as shown in FIG.
Does not contact the case of the disc cassette 42. Therefore, there is an effect that it is possible to prevent the liner pin 310 from being soiled or damaged.

(Embodiment 8) Hereinafter, an eighth embodiment of the present invention will be described with reference to the drawings. The eighth embodiment discloses a method of pushing up the liner pin from the lower surface direction of the disc cassette to raise and lower the liner.

As shown in the top perspective view of the disc cassette of FIGS. 68 (a) and 68 (b), there is no liner hole on the upper face. A liner hole 303 is provided adjacent to the recognition holes 313a, 313b, 313c on the back side, and a liner pin is inserted into the liner hole 303 from the back side of the drawing to raise and lower the liner.
69 (a) and 69 (b) are liner elevating parts A- in FIG. 68.
A sectional view of the A ′ plane is shown. First, when the liner pin 310 is in the OFF state as shown in FIG. 69 (a), the liner pin 304 and the recording medium 2 do not come into contact with each other. FIG. 69 (b)
When the liner pin 310 is inserted into the recognition hole 313 as shown in FIG.
16 is pushed rightward in the figure by the liner pin 310 and rotates counterclockwise about the pin shaft 315. Accordingly, the liner driving unit 316 causes the liner supporting unit 30 to
5 is pushed downward to bring the liner 304 and the recording medium 2 into contact with each other, and dust is removed as the line 5 rotates.

Next, the structure of the liner will be described. Figure 7
The structure of the liner is basically the same as the structure described with reference to FIG. 49, as shown in the configuration diagram of the liner 0 (a) (b) (c). However, the point that the movable portion 305a is provided at the tip of the driving portion of the liner driving portion 316 is different from the point that a liner driving groove 30a for accommodating the liner driving portion 316 is added as shown in FIG. 70 (c). .

Now, the structure of the liner pin 310 on the main body side will be described. The liner pin 310 and the motor 17 have a positional relationship as shown in the sectional view of the peripheral portion of FIG.
If the disc cassette 42 of the present invention is inserted in the direction of arrow 51, as shown in the sectional view of the peripheral portion of the liner pin of FIG. 72 (a), the liner 304 works together even if the actuator of the liner pin is not provided. Up and down. However, as shown in FIG. 72 (b), the conventional disc cassette 42
When the disk is inserted, the liner pin 310 does not have the liner hole 303, so that the liner pin 310 is automatically lowered by the insertion by the spring 317, and there is an effect that the conventional disk cassette 42 is not damaged or adversely affected. in this case,
For example, in an application such as a game machine where the frequency of disk access is low, it is not necessary to provide an actuator on the liner pin, so that the structure is simplified. FIG. 73
As shown in the magnetic head elevating / lowering sections (a) and (b), one elevating motor 21 can be used to interlock the liner pin 310 by the elevating / lowering section 20 and the connecting section 318. When this structure is used, the liner 304 always comes into contact with the recording medium 2 when the magnetic head 8 comes into contact with the recording medium 2, so that the actuator can also serve as the liner 304. Fig. 74
The sectional views of the disc cassettes of (a) and (b) are basically the same as those of FIG. 69, but the liner driving unit 316 is extended and a pin shutter unit 319 is added, so that FIG.
As shown in (a), when the liner pin is turned off, the pin shutter 319 is closed, which has the effect of preventing external dust from flowing into the disc cassette 42. Since this structure uses the vicinity of the recognition hole of the disc cassette, it is only necessary to add one small hole to the conventional disc cassette. Therefore, there is an effect that the compatibility of the cassette structure becomes higher. Further, the structure of FIG. 69 has an effect that the required space in the horizontal direction is small. Therefore, for example, the liner hole 303a can be provided in a portion where there is almost no mounting space as in the BB ′ cross section of FIG. 68, and the degree of freedom in cassette design is improved.

(Embodiment 9) A ninth embodiment of the present invention will be described below with reference to the drawings. Example 9 shows an example in which the liner driving unit 316 has a sufficient mounting space. The top view of the disc cassette in FIG. 75 is the configuration viewed from the top of the ninth embodiment, and the configuration of the liner 305 and the liner mounting portion 305a is substantially the same as that in FIG. In this embodiment, the movable portion 305 of the liner mounting portion 305
A liner lifting portion 305c is provided at a. The liner driving unit 316 pushes this portion down in the figure to move the liner 305 up and down. This is A- of FIG.
This will be described with reference to the sectional views of the elevating part in FIGS. 76 and 77 which are sectional views of A ′. As shown in FIG. 76, when the liner pin 310 is OFF, the pin shutter 319 is pushed downward by the spring 307 so that dust does not enter from the outside.
The liner support portion 305 and the movable portion 305a are also pressed against the upper surface by the effect of the leaf spring and the sub liner support portion 305b. Therefore, the liner 304 is not in contact with the recording medium 2.

Next, as shown in FIG. 77, the liner pin 310 is used.
When ON, the pin shutter 319 causes the liner driving unit 316 to rotate clockwise around the pin shaft 316 and push down the liner elevating unit 305c, so that the movable unit 305a of the liner attaching unit 305 is pushed down and the liner 304 and The recording medium 2 comes into contact with the foreign matter on the disk surface as the recording medium 2 rotates in the direction of arrow 51. Therefore, the effect of reducing the error rate can be obtained. Example 9
In this case, the structure is simple and the liner can be raised and lowered reliably. Further, since it is not necessary to provide a groove in the disc cassette 42a, the strength of the cassette is not impaired.

Further, B- in the top view of the cassette of FIG.
When attached to the B ′ sectional view, the structure is as shown in the sectional views of the liner pins of FIGS. 78 (a) and 78 (b). FIG. 76,
Since the operation is the same as the case of FIG. 77, detailed description will be omitted. As shown in FIG. 78 (a), when the liner pin 310 is off, the liner hole is closed by the pin shutter 319. As shown in FIG. 78 (b), when the liner pin 310 is on, the liner driving unit 315 rotates counterclockwise to lower the liner elevating unit 305C and push down the liner attaching unit 305a and the liner 304, so that the liner and the recording medium come into contact with each other. In this case, as compared with FIG. 76, there is an effect that the liner can be raised and lowered in a shorter space. When the liner pin 310 is inserted so that the contact between the liner and the recording medium is released, the liner comes into contact when not in use, and the frictional force prevents the recording medium from rotating, which has the effect of preventing damage to the recording medium. is there.

Example 10 Hereinafter, Example 10 of the present invention will be described.
The recording maximizing device will be described with reference to the drawings. The basic configuration is the same as the block diagram of FIG. First, the tracking method will be described in detail. As shown in the uncorrected tracking principle diagram of FIG. 79, in the ideal setting state, the magnetic head 8 on the upper surface and the optical head 6 on the lower surface have the same vertical positional relationship. Therefore, when the optical head accesses the optical track 65 of a specific optical address, the magnetic head 8 runs on the corresponding magnetic track 67 on the back surface. In this case, the DC of the tracking error signal of the optical head actuator 18
No offset voltage is generated. However, in reality, due to the product variation of the spring constant of the actuator and the application of gravity G due to the inclination of the apparatus, a deviation of ΔL, specifically, several tens to several hundreds of μm is generated between the center 321b of the optical actuator 18. . Further, the center 321C of the magnetic head 8 facing the center 321a of the optical actuator 18 also has a deviation due to an assembly error. Therefore, as shown in FIG. 79 (b), a positional deviation occurs between the magnetic head 8 and the optical head 6 which face each other.

The optical head 6 is provided with an optical track of a specific address.
Even if the track is restarted, there is no correspondence with the magnetic track tracked by the magnetic head 8, so that another magnetic track may be accessed. Specifically, the track pitch of the magnetic tracks is usually 50 to 200 μm.
The center of the optical head 6 and the magnetic head 8 is several hundred μm at maximum. Therefore, under bad conditions, the magnetic head 8 may travel on the magnetic track adjacent to the target track, and incorrect data may be recorded.

In order to avoid this, according to the present invention, FIG.
As shown in (a), an offset voltage ΔV _o is applied to the tracking control signal so that the optical head 6 is decentered by ΔL so that the optical pickup 6 comes to the back side of the reference magnetic track 67z. That is, if the eccentricity correction amount ΔL is always eccentric, in the case of a stationary machine, the magnetic head 8 and the optical head 6 always face each other with high accuracy in the vertical direction, and the correlation between the optical track 65 and the magnetic track 67 increases, and The mechanical precision of is within a track deviation of several μm to several tens of μm.

In this way, even if the track pitch is 50 μm, the magnetic head can track to the target magnetic track based on the optical address.

As shown in FIG. 80 (b), if this offset voltage ΔV _o is applied, the optical head 6 is eccentric by ΔL, and the address of the optical track 68 is accessed to cause the magnetic head 8 to move. The desired magnetic track 67 will be accessed.

Here, a method of calculating the offset voltage ΔV _o will be described. First, as a measure against eccentricity, a method of obtaining the average track radius of the disk will be described. In the CD or mini disk (MD) standard, the eccentricity of the optical track 65 is maximum 200 μm. On the other hand, the track pitch of the magnetic track 67 is 2DD, that is, 2 in the 135TPI class.
It is 00 μm. Therefore, if no measures are taken, it is difficult to refer to the address of the optical track 65 to access the target backside magnetic track 67.

As shown in the disk eccentricity amount diagram of FIG. 81 (a), an eccentricity of Δr _n exists between the premastered optical track 65 _PM and the locus 65 _T when the servo is not applied to the optical head 6. Occur.

Here, when the tracking servo is applied to the optical head without moving the traverse, it can be detected that the tracking error signal as shown in FIG. 81 (b) is generated due to the eccentricity of the optical track.

[0093] When setting the optical track address at theta = 0 ° in the read reference point, the tracking radius by eccentricity r _n - △ r _n, and the radius r _n of the designed tracking
Draw a smaller radius. When θ = 180 °, on the contrary, r _n
It becomes + Δr _n , and draws a radius larger than r _n .

When the track pitch is 100 to 200 μm and the optical track has an eccentricity of ± 200 μm, the track radius itself changes unless track servo is applied.

As shown in the figure, the error is the smallest at θ = 90 ° and θ = 270 °. Therefore, θ = 90 °, 2
By determining the center position of the optical track with reference to the address of the optical track 65 _PM at 70 °, the radius r _n of the n-th track of the set value can be obtained.

As is clear from FIG. 81, θ = 90 ° and θ
= 270 °, Δr _n = 0, and standard track radius r
_n is obtained.

The positions of θ = 90 ° and 270 ° are shown in FIG.
It is obtained from the tracking error signal of (c).

By using the address of the optical track 65 at the position on the extension line of this angle, the optical head 65s is caused to track the optical head to obtain the standard track radius r _n. The effect is that tracking becomes possible. The optical address 320 is recorded on the first track of the magnetic track 67 or the TOC track.

In the case of the CD and MD formats, the number of address information is small in one round of one optical track. Therefore, 360 addresses at all angles cannot be obtained at 360 °.

As shown in FIG. 86, it is known what number block of address 1 corresponds to what number of times the angle θ is. As a result, an angular resolution of, for example, 1 degree can be obtained.
Therefore, by managing this block unit, optical address information of an arbitrary radius on an arbitrary angle can be obtained. The correspondence table of the magnetic track numbers corresponding to the accurate optical address information will be referred to as "address correspondence table" hereinafter.

The method for obtaining an accurate optical track radius has been described above. Next, a method of associating the magnetic track radius r _m with the optical track radius r _o will be described.

As for the positional deviation between the optical head and the magnetic head, the deviation during operation is added to the deviation during manufacturing. These cannot be uniquely determined because there are variations among products. It is important to clarify this correspondence for compatibility.

There are two methods for this. The first method is a method in which no reference track is provided on the magnetic surface of the recording medium.

When the magnetic surface is formatted as shown in FIG. 79 (b), a positional deviation ΔL usually exists between the magnetic head 8 and the optical head 6. If formatting is performed in this state, a track shifted by ΔL is recorded. In this case, when recording / reproducing on the same disk and under the same drive under the same condition, there is no problem because everything is done in a state of ΔL shift.

In this case, since there is backlash of the traverse actuator, it is necessary to always move the traverse in the same direction when tracking to a predetermined track, for example, from the inner circumference to the outer circumference.

In order to track the nth track again, an offset distance of ΔL is provided between the magnetic head 8 and the optical head 6 as shown in FIG. 79 (b) without applying an offset voltage during tracking. Exists. Therefore,
When the same optical track as during recording is accessed, the same magnetic track as during recording is tracked, so that the data on the target magnetic track can be recorded and reproduced.

Next, when this formatted recording medium is applied to another drive, the drive has such a characteristic that ΔL = 0, for example, as shown in FIG. 82A when no offset voltage is applied. In this case, the optical track and the magnetic track are displaced from each other by an offset distance ΔL _o as compared with the time of recording,
Data is recorded / reproduced on the wrong magnetic track.
In order to avoid this, in the present invention, the traverse is controlled and moved so that the reference magnetic track 67 is accessed as shown in FIG.

Next, with the traverse fixed, the offset voltage ΔV is changed so that the optical head 6 accesses the optical track 65 containing the reference address signal, and ΔV _o is obtained. As a result, the correspondence relationship between the optical track and the magnetic track can be made similar to that of the previous drive that has performed the formatting.

82. By constantly applying this offset voltage ΔV _o to the actuator of the optical head 6, FIG.
As shown in (b), the effect that all other magnetic tracks and optical tracks correspond to each other with an accuracy of several μm to + several μm can be obtained with an inexpensive structure. In other words, if a specific optical address is accessed by applying an offset voltage, a specific magnetic address can be automatically accessed. This effect can be obtained with a configuration in which the optical head 6 is not provided with a lens position sensor, and therefore, the number of parts can be reduced.

Next, the second method, that is, the method of recording the reference track on the magnetic recording surface in advance will be described. As shown in the diagram of the magnetic recording surface of FIG. 83, a magnetic track 67 on which a track for embedded servo is recorded when the disk is manufactured.
1 track is provided.

This servo magnetic track 67s is shown in FIG.
Of as shown in the left, A, B1 different frequencies f _a, f _b
Part of the two magnetic tracks on which the carrier is recorded are overlapped and recorded.

When the magnetic head 8 tracks this center and reproduces it, the magnitudes of f _a and f _b are the same. However, if it shifts inward, the output of f _a becomes large, and if it shifts to the outside, the output of f _b becomes large. Therefore, the traverse can be moved to control the magnetic head 8 to the center of the track.

By providing this servo magnetic track, the cost of the medium is slightly increased, but FIG.
In, there is an effect that a more accurate value can be obtained when the offset voltage ΔV _o is calculated. Also, the eccentricity information of the optical track can be obtained more accurately.

As shown in the side views of the magnetic heads of FIGS. 84 (a) and 84 (b), the slider 41 of the magnetic head 8 is formed by molding a soft material such as Teflon instead of metal. This has the effect of reducing damage to the magnetic recording layer 3 by the slider 41.

Further, as shown in the side views of the magnetic head of FIGS. 85 (a) and 85 (b), when the magnetic recording is not performed, the slider is tilted by the slider actuator to separate the magnetic head 8 from the magnetic recording layer 3, and the slider 41 Touch a part of the edge.

Next, as shown in FIG. 85 (b), when the slider 41 is tilted to be parallel to the magnetic recording surface by the actuator only during magnetic recording, the magnetic head 8 contacts the magnetic recording layer 3 and magnetic recording is performed. It will be possible. In this case, there is an effect that abrasion of the magnetic head 8 is reduced when magnetic recording is not performed.

(Embodiment 11) Hereinafter, Embodiment 11 of the present invention will be described.
The recording / reproducing apparatus in will be described with reference to the drawings.

The basic configuration is shown in FIG. 38 described in the sixth embodiment.
Is the same as the block diagram of. The eleventh embodiment employs a method which is generally called a non-tracking method and which does not apply the tracking servo control of the magnetic head.

The block diagram at the time of recording has a structure as shown in the block diagram of the recording circuit in FIG.

Two magnetic heads 8a having different azimuth angles as shown in the magnetic head diagrams of FIGS. 88 (a) and 88 (b).
And the magnetic head 8b are recorded using the A head 8a and the B head 8b, respectively. As shown in FIG. 88 (b), when the track pitch of the magnetic tracks 67 is T _P , the head width T
_H has a relationship of T _P <T _H <2T _P. Usually T _H = 1.
Used under the condition of 5 to 2.0 T _P. Therefore, when the nth track is recorded, it is also recorded in the area of the (n + 1) th track. At the time of recording the (n + 1) th track, this overlapping portion is overwritten for recording, so that the recording track is formed with a width of T _P.

As shown in an enlarged view of the recording format in FIG. 89, two heads having different azimuth angles, A head 8a and B head 8b, are switched at θ = 0 ° to record data while spirally overwriting data. Do it. Therefore, as shown in FIG. 88, a track width T _P smaller than the head width T _H is formed. A with different azimuth angles
Since the tracks 67a and the B tracks 67b are alternately adjacent to each other, crosstalk between tracks during reproduction does not occur. Further, as shown in the recording format diagram of FIG. 90, a guard band 325 is provided between a plurality of adjacent track groups 326.
Are provided, it is possible to record and reproduce independently of each other.

As shown in the data structure diagram of FIG. 91,
The data of each track such as A ₁ , B ₁ and A ₂ is composed of a plurality of blocks 327.
It is considered as one track group. A guard band 325 is provided between each track group to enable rewriting in track group units. A plurality of blocks constituting one track include a synchronization signal 328, an address 329, and a parity 33.
0, data 331, and error detection signal 332.

Here, the operation during recording will be described. The input data with the specified address is input to the input circuit 21. In the case of the eleventh embodiment, at the time of recording, the data is rewritten with the track group 326 of FIG. 91 as one unit. That is, a plurality of tracks are rewritten all at once. Since each track group 326 is separated by the guard band 325 as shown in FIG. 90, recording / reproducing in this unit does not affect other track groups.

When the input data includes only a part of the information of the track group, the data is insufficient, and the entire one track group 326 cannot be rewritten. Therefore, when the nth track group is rewritten, the nth track group is rewritten in advance.
The track group is reproduced and all the data is stored in the buffer memory 34 in the magnetic reproducing circuit 30. This data is sent to the input circuit 21 as an address and data at the time of writing,
Here, the data of the address matching the input data is replaced with the input data. In this case, the buffer memory 34
The same data as the address of the input data in may be replaced with the input data.

The n-th track group 32 to be written in this way
All the data of 6n are sent from the input circuit 21 to the magnetic recording circuit 29, modulated by the modulation circuit 334, and the separation circuit 333 creates the data for the A head 8a and the data for the B head 8b.

As shown in the recording timing chart of FIG. 92 (a), A track data 328a1 is recorded by the A head 8a at t = t ₁ , and the disc 360 is recorded.
B track data 328b1 is recorded by the B head 8b at t = t ₂ rotated by °.

As the switching timing signal for the A head and the B head, the rotation signal of the disk motor 17 or the optical address information is detected by the optical reproducing circuit 38 to detect the rotation of 360 °, and the disk rotation angle detecting section 335 outputs the magnetic recording circuit 2.
Sent to 9. A no-signal portion 337 is provided at the end of each track data 328, and a signal guard band is provided so that the A track data 328a and the B track data 328b do not overlap.

Although the guard band 325 is present on the disc, it is necessary to accurately set the recording start radius and the recording end radius so as not to erroneously record on the adjacent track group 326 beyond the guard band 325. The present invention uses a specific optical address as a reference point and uses a method of obtaining a permanent absolute radius.

In FIG. 87, the optical head 6 and the optical reproducing circuit 3
Read the optical address from 8. In this case, the optical head eccentricity correction method described with reference to FIGS. Calculate the eccentricity correction amount using the same method,
Stored in the eccentricity correction amount memory 336, read it when necessary,
With the optical head 6 being decentered by the optical head drive circuit 25, the traverse movement circuit 24a drives the traverse actuator 23a while referring to the optical address to move the traverse. Thus, the magnetic track 67 can be accurately tracked by referring to the optical address of the optical track.

Although an example in which two magnetic heads 8a and 8b having different azimuth angles are alternately used for recording has been described, this method requires a long recording time.

As shown in FIG. 88 (c), the positions of the two heads in the radial direction are shifted by T _p , and A track data and B track data are simultaneously sent from the separation circuit 333 in FIG. By sending at a pitch twice T _p for each circumference, as shown in the recording timing chart of FIG. 92 (b), one track group can be recorded in half the time, and the speed can be increased. There is.

In this way, the input data is spirally recorded on the track. As a specific design example, even if the eccentricity of the optical track is ± 200 μm, the eccentricity correction means eliminates the influence and the eccentricity of chucking falls within ± 25 μm, for example. The eccentricity of the rotating shaft of the motor is
Within ± several μm. In this case, the width of the guard band is 50
When the track pitch is 10 μm or more, tracks can be recorded with a width within an error of ± several μm even if the track pitch is 10 μm.
Thus, there is an effect that a large capacity recording can be performed by the non-tracking method.

Traverse control for spiral recording will be described. In the recording format of FIG. 89,
Two points, a recording start optical address 320a and a recording end optical address 320e, are set as reference points. In the case of FIG. 89, the traverse may be driven at the same pitch from the start point to the end point while the disk makes four revolutions. In the case of the present invention, a configuration is adopted in which a screw is rotated by a rotary motor to feed a traverse. The rotation pulse from the rotary motor is obtained.

[0134] The traverse as the traverse gear rotation speed diagram in FIG. 97 is moved from the starting point optical address 320a to the optical address 320e of the end point, measure the rotational speed n _o of this period of the traverse drive gear. Since the disk is rotated four, the system controller 10 n _o / 4T r. p.
The rotation speed of s is calculated, and a command to rotate the traverse drive gear is issued at this rotation speed. Then, the magnetic head records data at an accurate track pitch. Moreover, since the magnetic head 8 is near the end optical address 320e at the end of recording, it does not pass through the guard band and reach the start optical address 320x of the adjacent track group. The traverse drive gear rotation speed may be measured once every time the disk is changed. It may also be recorded on a disc. or,
By performing the traverse control while counting the line number of the optical track, smoother and more accurate traverse feeding can be performed.

The cylindrical recording format diagram of FIG. 96 shows the case where coaxial tracks are used. In this case, the optical address 320a, 320b, 32 of each track
The traverse is moved every time so that the optical head can access the six points 0c, 320d, 320e, and 320f in each track recording. As a result, a cylindrical track is formed.

Further, as shown in the optical recording surface format diagram of FIG. 98, the non-address area 3 having no optical address and no signal.
When 46 is present, access by optical address is not possible. In this case, the reference radius and the disc rotation reference angle are obtained in the optical address area 347, and the line number of the optical track is counted to obtain the non-optical address area 34.
Also in 6, the predetermined relative position can be tracked. Line No. from the reference light address point for each track
If the table is created and written in the magnetic TOC area 348, another drive can access the target magnetic track. The method of accessing by line No. has a lower absolute position accuracy than the optical address method, but has an effect of increasing the access speed. Both of them are preferably used in combination, but the line No counting method is often used during reproduction in terms of high-speed access. There are two types of drives, a high density type and a normal density type. High density type head width T _H is 1 / 2-1 / 3 of the normal type. The track pitch is 1/2 to 1/3 when the normal type is T _bo.
It becomes T _po . In the case of non-tracking, the high-density type can reproduce the normal-density type data, but the reverse is not possible.

In order to ensure compatibility, a high density type recording medium is provided with a compatible track, and recording is performed at a track pitch of T _po as shown in the recording format diagram of FIG. 99, so that the normal type recording can also be performed. As shown in the correspondence diagram between the optical recording surface and the magnetic recording surface of FIG. 100, when the data of the optical surface is divided into three programs 65a, 65b and 65c, each of the magnetic recording data to be saved,
Magnetic tracks 67a, 67b, 67 on the respective surface regions
Setting the area in c has the effect of reducing the traverse movement amount and shortening the access time.

Next, the reproducing principle will be described. The block diagram at the time of reproduction in FIG. 93 shows blocks related to reproduction. 87 is almost the same as the block diagram of FIG.
Only different.

First, the system controller 10 sends a reproduction command and a magnetic track No access command to the traverse controller 3.
Sent to 38. Similarly to FIG. 87, the magnetic head accurately accesses the target magnetic track No.

As shown in FIG. 89, the magnetic track 67 is spirally tracked, and the A head 8a and the B head 8 are tracked.
Both outputs of b are simultaneously input to the magnetic reproducing unit 30, amplified by the head amplifiers 340a and 340b, demodulated by the demodulators 341a and 341b, and the error check unit 342.
a and 342b perform error checking, and send a normal signal only to normal data to the AND circuits 344a and 344b. The data separating unit separates the data into addresses and data, and the AND circuits 344a and 344b send only data having no error to the buffer memory 34, and store the respective data at predetermined addresses. This data is output from the memory 34 based on the read clock from the system controller 10. When the memory of the buffer memory 34 is about to overflow, an overflow signal is sent to the system control unit 10, and the system control unit 10 issues a command to the traverse control unit to reduce the traverse feed width. Alternatively, the speed of the motor 17 is slowed to lower the reproduction transfer rate. In this way overflow can be prevented.

When the error check unit 342 has many errors, an error signal is sent to the system control unit 10, and the system control unit 10 sends a track pitch reduction command to the traverse control circuit 24a. Thus, the track pitch of the playback is normal T _p from _{2 / 3T p, 1 / 2T} p, 1
/ 3T _p , and the data of the same address is 1.5 times, 2
Since it is reproduced twice or three times, the error rate decreases.
Further, if all the data of the next (n + 1) th track is collected before all the data of the nth track is collected in the buffer memory 34, there is a possibility that the data of the nth track cannot be reproduced. In this case, the system control unit 10 issues a reverse traverse command to the traverse control unit to return the traverse to the inner circumferential direction. Then, by reproducing the nth track, the data of the nth track can be reproduced.

Thus, there is an effect that the data can be surely reproduced without increasing the error rate.

Next, a disc reproducing operation by non-tracking will be described. As shown in the data layout diagram of FIG. 94,
Recording data 345a, 345b, 345 of the A track
The data is recorded on the disc as shown by c and 345d. The data of B track, B ₁ , B ₂ , B ₃ , and B ₄ are also recorded, but cannot be reproduced when reproduced by the A head because the azimuth angle is different.

For ease of explanation, the B track data is omitted. When the recording data 345 of the A track is reproduced by the A head 8a with the same track pitch T _{po as} that at the time of recording, the track of the track has a discrepancy between the disk and the chucking, and therefore the track tracks 349a, 349b, 349.
c, 349d. Head width T of A head 8a
_{Since H} is wider than T _po, it plays half tracks on both sides. Of course, B track is not reproduced.

Therefore, the data reproduced without error in the reproduced signal of each track locus is the A head reproduced data 3
It becomes like 50a, 350b, 350c, 350d, 350e.

This data is sequentially sent to the buffer memory 34 of FIG. 93 and recorded at a predetermined disc address,
The data of each track is completely reproduced like the memory data 351a and 351b.

In this way, the non-tracking A track data is reproduced. The B track is reproduced in the same manner.

As described above, in the eleventh embodiment, since recording / reproducing can be performed with a small track pitch without applying tracking servo of the magnetic head, there is an effect that a large capacity memory can be realized with a simple structure. In particular, since the traverse control is performed by using the address of the optical surface, the traverse feed accuracy may be low, and the linear sensor in the radial direction can be omitted. When applied to MDROM, several KB
~ Number + KB block unit, C without cartridge
When it is applied to a DROM, it has a disadvantage that it can be rewritten only in block units of several hundred B to several KB. However, when focusing on multimedia applications for home use, there is no problem because low cost and large capacity are more important than high-speed accessibility. In exchange for this disadvantage, in the case of the non-tracking servo system, there is an effect that the capacity can be dramatically increased by one digit to two digits or more. This large capacity can be realized at a low cost because the system does not require an expensive track servo. This is because in the case of the non-tracking method, basically, the tracking is accurately performed only by the accuracy of the bearing of the rotary motor. And this bearing precision is realized at low cost. In the case of the MD-ROM used in the cartridge, since the recording wavelength can be set to 1 μm or less, the recording capacity of about 2 to 5 MB can be obtained. Example 12 in the case of a CDROM used naked
Since a printing layer and a protective layer are provided on the magnetic layer as described later in 13, the recording wavelength becomes as long as 10 μm or more. For this reason, in the normal method, only a capacity of several + KB can be obtained. But,
Number + KB to 1MB due to adoption of no-tracking method
A recording capacity of some degree can be obtained. As described above, the eleventh embodiment has an effect that the optical access mechanism of the current CD, CDROM, MD, MDROM can be used as it is, and a large capacity can be achieved at low cost.

(Embodiment 12) A recording / reproducing apparatus according to Embodiment 12 of the present invention will be described below with reference to the drawings.

The basic structure is almost the same as the block diagram of FIG. 87 described in the embodiment. The recording / reproducing apparatus of the twelfth embodiment uses a recording medium in which a magnetic recording layer is provided on the back surface of a ROM disk which does not use a cartridge like the CDROM described in the previous embodiment. Since the basic operation of the recording / reproducing apparatus has already been described, the description will be omitted and the recording medium will be described in detail.

FIG. 101 is a perspective view of the recording medium 2. The light transmission layer 5, the optical recording layer 4, the magnetic recording layer 3, and the printing layer 43 on the printing layer 43 are arranged from the bottom, and the print 45 such as a label such as a title of a CD is formed on the printing area 44. A hard protective layer 50 having a Mohs hardness of 5 or more may be provided. CD
In a recording medium such as a CDROM or a CDROM which does not have a cartridge and has an optical recording surface on one side, the printing area 44 can be provided on almost the entire one side on the opposite side. LD and LD
In the case of having a double-sided optical recording surface such as a ROM, as shown in the perspective view of the recording medium in FIG. 102, the print area 44 can be provided in a narrower area in the central portion that does not affect the optical reproduction.

In this embodiment, a case where a CDROM is used as a recording medium will be described. Here, the configuration and manufacturing method of the recording medium will be described. In the manufacturing process diagram of the recording medium of FIG. Let P be P, and when P = 1, prepare a substrate 47 having the light transmitting portion 5 in which the pits 46 are engraved. When P = 2, the light reflecting film 48 of aluminum or the like is formed by vapor deposition, sputtering or the like. Hc is 150 at P = 3
High Hc of 1750 or 2750 Oe above 0 Oe
The magnetic recording layer 3 is prepared by directly applying a magnetic material such as barium ferrite having the above properties, or transferring the material once applied to the base film together with the adhesive layer. The recording medium of this embodiment is not protected by the cartridge. Therefore, it is necessary to use a high Hc magnetic material so that the recorded data is not destroyed by a strong external magnetic field such as a magnet. Hc is 1750O when magnetic media is used naked in industrial applications
It has been confirmed by a field test that data is not destroyed under normal use conditions by using a magnetic recording material of e to 2750 Oe. In domestic use, as can be seen from the magnetic field strength diagrams of various domestic products in FIG. 121, only 1000 to 1200 Gauss magnetic fields are usually present in the home. Therefore, H of the magnetic material of the magnetic recording layer 3 is
c may be set to 1200 Oe or more. In this embodiment, by using a material having Hc of 1200 Oe or more, data destruction in daily life is prevented. In order to improve the reliability during data recording, the reliability is further improved by using barium ferrite or the like and increasing the Hc of the magnetic material to 2500 or more. Barium ferrite is suitable for a CDROM type partial RAM disk in which low cost mass production is indispensable because barium ferrite is inexpensive and can be produced by an inexpensive coating process, and since random orientation is naturally performed, a randomizer process is unnecessary. In this case, it is processed on a disk. What is important is that since recording and reproduction are performed in the circumferential direction, recording characteristics are deteriorated when magnetically oriented in a specific direction such as a magnetic card or a magnetic tape. In order to prevent such orientation in a certain direction, a magnetic film is formed by applying an external magnetic field in various directions by a randomizer before the applied magnetic material is solidified. As described above, in the case of barium ferrite, the effect that the randomizing step can be omitted can be obtained. However, in case of CD and CDROM,
As shown in 01, the CD standard requires that the title and contents of the medium be printed and displayed as a label so that the consumer can visually recognize and discriminate the contents of the medium. It is also important to enhance the product value by printing photos in color and making the appearance beautiful. Since magnetic materials are usually dark brown or black tones,
You cannot print directly on this. When P = 4, the dark color of the magnetic recording layer 3 is erased, and in order to enable color printing, a printing base layer 43 of a color with many reflections such as white is formed by coating or the like to have a film thickness of several hundred nm to several μm. .. From the viewpoint of recording characteristics, it is preferable that the print underlayer be thin, but if it is too thin, the color of the magnetic recording layer below will be transmitted, so the film thickness d ₂ of the print underlayer 43 is required to have a certain thickness. . In order that light does not pass through, a thickness of at least half the wavelength is required, and therefore a thickness of λ / 2 = 0.2 μm or more is required for the shortest wavelength of visible light λ = 0.4 μm. Therefore, d ₂ is required to have a thickness of 0.2 μm or more. By using d ₂ ≧ 0.2 μm, the effect of shielding the color of the magnetic material as a base for printing can be omitted. On the other hand, when d ₂ > 10 μm, the magnetic recording characteristics are significantly deteriorated due to space loss, which is not preferable. Therefore, at least d ₂ ≦ 10 μm can be used for magnetic recording and reproduction. By setting 0.2 <d ₂ <10 μm, there is an effect that both the color cutoff characteristic and the magnetic recording characteristic can be made compatible. Experiments have revealed that it is desirable to use it at around 1 μm. When a magnetic recording material is mixed with the print base layer 43, there is an effect of substantially reducing space loss.

By applying the printing ink 49 made of dye at P = 5, the label printing 45 as shown in FIG. 101 can be displayed. Since printing is performed on the white print base layer 43, full-color printing is possible. P in FIG.
= 5, the printing ink 49 of the dye is applied, so that the ink soaks into the printing base layer 43 at a depth of d ₃ , and no unevenness is generated on the surface of the printing base layer 43. As a result, the head touch of the magnetic head is improved during magnetic recording / reproduction, and the dropout of printing due to running of the magnetic head is prevented. Thus, the recording medium is completed.

As the manufacturing method, the magnetic recording layer 3 with P = 3,
The printing ink 49 of P = 5 and P = 5 is manufactured using a gravure coating process as shown in the overall perspective view of the coating process of FIG. To explain this, the coating material of the barium ferrite magnetic material transferred from the coating material pot 352 to the coating material transfer roll 353 is selectively etched and remains in the CD-shaped etching portion 355 on the intaglio drum. The unnecessary coating material is removed by the scriber 356. CD
The coating material in the shape of is a CD-shaped coating portion 358 on the soft transfer roll 367 covered with the soft resin portion 361.
Is transcribed as. The coating section 358 is transferred and coated on the surface of the recording medium 2 such as a CD. Before being dried, a magnetic field is applied by the random magnetic field generator 362, and a random magnetization orientation is obtained. Since the soft transfer roll 367 is soft, it can be accurately applied to a hard object such as a CD. In this way, P = 3, P = 4, and P = 6 application of FIG. 103 can be performed. However, the printing process of P = 5 may be an offset printing process because the film thickness is thin. Further, as shown by P = 6 in FIG. 103, by applying a protective layer 50 made of a hard transparent material having a thickness d4 of Mohs hardness of 5 or more on the recording medium, it is possible to prevent the falling of the printing ink and to prevent external scratches. Since the magnetic recording layer 3 can be protected from abrasion by the magnetic head, the reliability of data is improved.

As shown in the cross-sectional view of the coating transfer process of FIG. 106, a protective layer is formed on the release film 359 by the process of P = 6, 5, 4, 3 in the reverse order of the process described in FIG. 50, printing ink 49, printing base layer 43, and magnetic recording layer 3 are applied, and random orientation is performed by a random magnetic field generator 362. The coating film is aligned with the surface of the substrate 4 on the pit 46 side, and after transfer, it is fixed by thermocompression bonding and the release film 359 is removed, thereby completing the recording medium having the same structure as the process P = 6 in FIG. To do. In the case of mass production, the transfer method has a higher throughput and a lower cost. Therefore, when producing tens of thousands of CDs, the production efficiency is improved. Therefore, it is suitable.

Although the dye is used at the time of printing in FIG. 103, the pigment printing ink 49 may be used as in step P = 5 in the coating process diagram of FIG. In this case, the thickness is d3, but by providing the protective layer 50 made of a transparent material containing a lubricant satisfying d4> d3 at P = 6, the effect of reducing unevenness on the surface and improving the head touch by the lubricant is provided. is there. The use of pigments has the effect of enabling wider color printing. In this case, after the step of P = 5, hot pressing may be applied to eliminate surface irregularities and the product may be used as it is as a finished product. In this case, since the protective layer 50 can be omitted, there is an effect that one step can be reduced.

Next, a method of forming the magnetic shield layer will be described. Since the magnetic head is on the side of the magnetic recording layer 3 of the recording medium and the optical head is on the side of the light transmission layer, electromagnetic noise from the actuator of the optical head leaks directly to the magnetic head, and the error rate during reproduction of the magnetic signal is increased. Deteriorates. As shown in the diagram of the relative noise amount from the optical pickup to the magnetic head in FIG. 116, noise of nearly 50 dB is generated. By providing a magnetic shield in the recording medium 2 as a countermeasure, the influence of electromagnetic noise can be reduced. As shown in the manufacturing process diagram of the recording medium of FIG. 107, when P = 2, the magnetic shield effect is obtained by providing the high μ magnetic layer 69 such as permalloy having a high μ and a small Hc by a spat or the like. When it is desired to form the low Hc magnetic layer 69 in a short time or to make it thick in the manufacturing process, a permalloy foil having a thickness of several to several tens of μm may be inserted. It can be made thick even by the plating method. By making it thick, the magnetic shield effect becomes higher. Further, in FIG. 103, the light reflection layer 48 is made of aluminum at P = 2, but light reflection and the magnetic shield can be shared by one film by forming permalloy by sputtering. If you want to thicken permalloy, you can make it at low cost by plating method. This has the remarkable effect of halving the number of steps for the reflection shield film. In addition, in the process of the transfer method, FIG.
In addition to the step shown in FIG. 106, a recording medium having a magnetic shield effect can be obtained by sandwiching the adhesive layer 60a and the high μ magnetic layer 69 such as permalloy foil of several μm to several tens of μm. It can be created in the transfer process.

As described above, the recording medium having the magnetic recording layer and the optical recording layer having the printing surface as shown in FIG. 101 can be prepared. Therefore, it is possible to provide the same label as that of the conventional CD that meets the standard of the CD, and at the same time, the magnetic recording surface can be added. Now, as described above in the magnetic field strength diagram of domestic products in FIG. 121, the magnets existing in daily life are mainly ferrite magnets which are inexpensive. And most of the magnets are not directly exposed. A magnetic field of about 1000 Oe is generated even in the exposed area and the vicinity thereof. Rare earth magnets, such as magnetic necklaces, are rarely used in daily life, but because of their small size, they are unlikely to magnetize barium ferrite magnetic recording materials. Therefore, by using a magnetic recording material having Hc of 1200 Oe such as barium ferrite and 1500 Oe or more with a margin, it is possible to prevent data destruction of the magnetic recording layer by a magnet existing in daily life. Furthermore, since a magnetic shield layer made of a high μ magnetic material can be added, electromagnetic noise from the optical head during magnetic reproduction can be greatly reduced. The above manufacturing method basically uses an inexpensive construction method such as a gravure coating process and an inexpensive material, and thus has a low cost. There is a remarkable effect of being obtained.

Example 13 Hereinafter, Example 13 of the present invention will be described.
The recording / reproducing apparatus in will be described with reference to the drawings. The basic configuration is similar to the block diagram of FIG. 87 described in the eleventh embodiment. The major difference is that a magnetic material having a higher Hc than that of an ordinary magnetic disk is used as described in Embodiment 12, and a nonmagnetic protective layer having a thickness of 1 μm is formed on the upper layer of the magnetic recording layer.
Since a recording medium having a length of m or more is used, a magnetic head suitable for this recording medium is used and measures are taken to prevent mixed noise due to a magnetic field from the optical head.

First, the structure of the magnetic head will be described. In the overall block diagram of the recording / reproducing apparatus of FIG. 110, the magnetic head of the block diagram of FIG. 87 is divided into two, the write magnetic head 8a and the read magnetic head 8b are integrated, and noise canceling Magnetic head 8s
3 heads are used. Since it is possible to reproduce while recording, error checking can be performed at the same time. Since other operations are the same as those in FIG. 87, detailed description thereof will be omitted.

Here, the two heads of the magnetic heads 8a and 8b, which are the characteristics of this embodiment, will be described with reference to the cross-sectional view of the magnetic head portion of FIG.

The optical head 6 and the magnetic heads 8a and 8b are arranged to face each other on both sides of the recording medium 2, and the optical head 6 accesses a desired specific track of the optical recording layer 4 on the recording medium 2. As a result, the magnetic heads 8a and 8b that move together with the optical head 6 travel on the magnetic tracks on the back side of the optical tracks on the magnetic recording layer 3, and the magnetic recording is performed by the write magnetic head 8a. Is performed by the magnetic head 8b. This recording / reproducing state will be described with reference to the magnetic track of FIG. Since the magnetic head 8a has a head gap 70a having a track width La for writing and a gap length Lgap, a magnetic track 67a having a width of La is recorded on the magnetic recording layer 3. On the magnetic track accessed by the magnetic head 8, there is a disk-shaped disk cleaning section 376 made of a soft material such as felt.
It has the effect of removing dust and dirt on the disc and reducing the error rate during playback. In the OFF state of FIG. 111, neither the magnetic head 8 nor the disk cleaning part 376 connected to the disk cleaning part connection part 380 by the spring is in contact with the recording medium 2. Next, when the magnetic head 8 is lowered,
First, the disk cleaning unit 376 lands on the recording medium 2 as in N-A. The magnetic head portion 8 does not come into contact with the recording medium 2 due to the disk cleaning portion connecting portion 380 including a spring. Therefore, in the ON-B state, the magnetic head 8 soft-landes in two steps of the recording medium 2. Therefore, even if the magnetic head 8 is raised and lowered while the recording medium 2 is rotating, both the magnetic head 8 and the recording medium 2 are exposed. This has the effect of preventing damage. Further, as shown in the top view of FIG. 113, since the magnetic track 67a before the traveling of the magnetic head 8 is cleaned, the effect that the error rate at the time of magnetic recording / reproduction is reduced can be obtained.
A magnetic head cleaning unit 377 interlocking with the magnetic head elevating / lowering unit 21 is also provided, and the magnetic head cleaning unit 377 cleans the contact portion of the magnetic head 8 at least once when the magnetic head 8 moves up and down when a disk is mounted. To be done. At this time, the disc of the disc cleaning unit 376 rotates a slight angle and becomes a new face, so that the disc is cleaned by the new face when the next disc is mounted. Next, since the reproducing head gap 70b of the magnetic head 8a has a width of Lb only, only the width of the reproducing track 67b of the magnetic track 67a is reproduced. In the case of the thirteenth embodiment, the head gap length Lgap of the magnetic head 8a is important. This is because the recording medium described in the twelfth embodiment has the print base layer 43 and the print layer 49 protective layer 50 between the magnetic recording layer 3 and the magnetic heads 8a8b, as described in FIG. The thickness is d2, d3, d4
Is. Therefore, a space loss of at least d = d2 + d3 + d4 always occurs. The space loss S is given by S = 54.6 (d / λ) (dB) (1) when the recording wavelength is λ. Further, there is a relationship between the head gap Lgap and λ, which is expressed by λ = 3 × Lgap ………………………………………… (2).

As a result of experiments, it is preferable that the print base layer 43 has a thickness of 1 μm or more from the viewpoint of the light blocking effect. In addition, the printing layer 49
The protective layer 50 needs to have a total thickness of 1 μm. Therefore d
Is required to be 2 μm, and d ≧ 2 μm ……………………………………………… (3) From the above three conditional expressions, S = 54.6 × 2 / 3Lgap (dB) ... (4)

This can be represented by the relationship diagram between the head gap and the space loss in FIG. If the space loss alone is not suppressed to at least 10 dB or less, sufficient recording / reproducing characteristics cannot be obtained. Therefore, it is understood from the graph of FIG. 112 that LGap needs to be set to at least 5 μm or more.
A magnetic head of a recording / reproducing apparatus for recording / reproducing by rotating a magnetic disk for recording data such as a hard disk or a floppy has a slider portion and a head gap is usually 0.5 μm or less. When the recording medium of the present invention is recorded / reproduced using such a conventional magnetic head for a magnetic disk, sufficient recording / reproduction output cannot be obtained due to the presence of the protective layer or the printing layer. However, as in the thirteenth embodiment, the slider portion 41 is provided as shown in the magnetic head portion 8a of FIG. 111 and the head gap of at least the recording head 8a is set to 5 μm or more. Therefore, as shown in the graph of FIG. Is 10 dB or less.
Therefore, there is an effect that a sufficient recording / reproducing output can be obtained at the time of recording / reproducing.

In the thirteenth embodiment, a full-color label can be printed on the surface of the medium, and the conventional CD and CDR can be printed as shown in FIG.
It is possible to use a recording medium having the same appearance as the OM. Therefore,
Even if the CD having the magnetic recording layer of the present invention is adopted, the difference in appearance does not cause confusion to consumers, and the basic functions of the CD standard are not impaired. In particular, since barium ferrite, which has a high Hc and a low material cost and does not require a random orientation process, is used for the magnetic recording layer, magnetic data is not destroyed even under the worst conditions in daily life and magnetic fields can be manufactured at low cost. .. As described above, since the CD can be handled in exactly the same manner as the existing CD, there is an effect that it is completely compatible with the CD.

Next, countermeasures for suppressing magnetic field noise from the optical head to the magnetic head will be described. Electromagnetic noise from the optical head actuator 18 causes noise to be mixed into the reproducing magnetic head 8b, resulting in a poor error rate.

Therefore, as a first method, by using the recording medium 2 having the magnetic shield layer 69 described in the twelfth embodiment as shown in the transverse sectional view of the magnetic head peripheral portion of FIG. 114, electromagnetic waves from the actuator of the optical head 6 are used. It is possible to prevent the error rate from deteriorating due to the mixing of noise into the magnetic head 8. In this case, when the optical head comes to the end of the disk, since there is no magnetic shield outside the disk, electromagnetic noise from the optical head actuator reaches the magnetic head 8. Therefore, as shown in FIG. 110, a magnetic shield 360 is provided in the peripheral portion of the disk on the recording / reproducing apparatus side to block electromagnetic noise outside the disk. As another method, as shown in FIG. 111, the actuator 18 of the optical head is connected to a magnetic shield 3 having a high μ such as permalloy or iron.
A lens opening 362 is surrounded by 60. As a result, the effect that the electromagnetic noise generated by the actuator of the optical head is less mixed into the magnetic head 8b, and the mixed electromagnetic noise is significantly reduced.

FIG. 116 is a diagram showing the relationship between the gap between the magnetic head and the optical head and the mixed noise. The magnetic head of the actually manufactured recording / reproducing apparatus with the optical head portion fixed and the focus control on the optical recording portion controlled. The relative level of electromagnetic noise mixed from the optical head 6 to the magnetic head 8 is measured by moving the position of the part on a plane facing the recording medium. The second method is to detect this noise and add it to the playback signal in anti-phase,
The method is to reduce the noise component. As shown in the block diagram of the magnetic recording / reproducing apparatus of FIG. 111, a noise detecting unit such as a noise canceling magnetic head 8s and a magnetic sensor is provided, and in the noise canceller unit 378, a constant addition is made in the opposite phase to the reproducing signal of the magnetic head 8b. By adding with the ratio A, the noise component is canceled. Noise can be canceled by optimizing the addition ratio A. The optimum addition ratio A ₀ can be obtained by running a magnetic track having no magnetic recording signal and changing the addition ratio so that the reproduction signal is minimized. You can calibrate A ₀ `in that way. This calibration work is performed when the mixed noise becomes large. In this case, the same effect can be obtained by using the recording head 8a as a mixed noise detection unit by utilizing the fact that the recording head 8a is not used during reproduction in FIG. 110 and inputting the signal of the recording head 8a to the noise canceller 378. . In this case, there is an effect that the canceling magnetic head 8s can be omitted.

The configuration in the case of providing the noise canceling magnetic head 8s will be described. As shown in the configuration diagram of the noise canceling magnetic head of FIG. 129, as shown in the side view of FIG. 129 (a), the noise canceling magnetic head 8
It is attached to the magnetic heads 8a and 8b via the coupling portion 8t. FIG. 129 (c) shows a view from above.
FIG. 129 (b) shows a side view as seen from the direction of travel of the truck. When the recording medium 2 is contacted, a do space loss in height occurs. From equation (1) of this embodiment, λ = 200 μm
In this case, if do is 200 μm or more, the reproduction signal from the magnetic recording layer becomes −60 dB and reproduction is hardly possible. On the other hand, as shown in the diagram of the mixed noise in FIG. 116, the level of the mixed noise is − even if the magnetic head is moved upward by 0.2 mm.
Almost no decrease within 1 dB. In this case, if the distance Ls between the noise canceling magnetic head 8s and the reproducing magnetic head 8b is λ = 200 μm, then λ / 5, that is, 40.
By leaving more than μm, it is possible to prevent the original signal from being mixed from the reproducing head. Therefore, there is a great effect that it is possible to almost completely suppress the electromagnetic noise mixed from the optical head drive section to the reproducing magnetic head. Also, the canceling magnetic head 8s
Instead, as shown in the configuration diagram of the magnetic sensor of FIG. 130, a magnetic sensor 381 such as a Hall element or an MR element is provided on the slider 41 near the magnetic head 8 to detect the drive magnetic noise of the optical head 6. be able to. By adding this signal to the magnetic reproduction signal in opposite phase, the mixed noise can be greatly reduced. In this case, there is an effect that the size can be reduced as compared with the magnetic head detection method.

As is apparent from FIG. 116, as the third method, when a space of 10 mm is provided, noise of 15 dB is reduced. Therefore, the distance between the optical head and the magnetic head is 10 mm.
By taking the above, there is an effect that noise is significantly reduced. When separated as described above, it is important to maintain the accuracy of the positional relationship between the optical head and the magnetic head. A configuration that specifically realizes this will be described.

As shown in the cross-sectional view of the head traverse portion of FIG. 117, the optical head 6 and the magnetic head 8 are rotated by the same traverse actuator 23 so that the traverse gear 3 is rotated.
The traverse shafts 363a and 363b rotate in the same direction by 67a, 367b, and 367c. These have opposite threads to each other, so the optical head 6 has an arrow 51a.
As shown by, the magnetic head 8 moves to the left in the drawing by the arrow 5
In the direction of 1b, they move in the opposite directions to the right.
Then, each head first detects the position reference points 364a and 36a.
As a result of hitting 4b, the position is adjusted and the optical head 6 moves above the reference optical track 65a, and the magnetic head 8 moves above the reference magnetic track 67a. Since the initial setting of the positions of both is performed in this way, the accuracy of the positional relationship between the two during movement is maintained. By performing this positioning at least once when a new recording medium 2 is mounted or when the power is turned on, the two simply move by the same distance. Therefore, when the optical head 8 accesses the specific optical track 65, the magnetic head 6 accurately accesses the specific magnetic track 67 on the same radius as the optical track 65. After that, when the optical head 6 is moved, the magnetic head 8 is also moved by the same amount. Therefore, as shown in the top view of the traverse of FIG. 118, the optical track 67b and the magnetic track 65b which are on the same radius are always accurately located. To access. In the case of the outermost circumference, both heads are located on the track on the circumference of radius L ₂ . In the case of the innermost circumference, both heads move on the track on the circumference of radius L ₁ . In this case, the distance between the optical head 6 and the magnetic head 8 is 2L ₁ , but this distance is 10
When it is equal to or larger than mm, the noise mixed from the optical head to the magnetic head becomes small. In the case of a CD, since L ₁ = 23 mm, the distance between the two is 2L ₁ = 46 mm, and as is clear from FIG. 116, the mixed noise is 10 dB or less, and there is a great effect that there is almost no effect. As shown in FIG. 117, when the recording medium 2 is mounted, it cannot be mounted as it is because of the magnetic head 8. Therefore, the magnetic head 8 and the traverse portion are largely lifted by the elevating portion 21 of the magnetic head shown in FIG. 1 to mount the recording medium. at the time,
The positional relationship between the two heads described above goes wrong. At this time, as described above, the contact surface of the magnetic head 8 is cleaned by the magnetic head cleaning unit 377. Then, the magnetic head 8 and the traverse portion are returned to predetermined positions. At the time when the magnetic head 8 and the traverse portion are returned to their original positions, the optical head 6 and the magnetic head 8
The exact relative positional relationship with Therefore, even if the magnetic head 8 is moved in conjunction with the optical head 6 as it is, the specific magnetic track 67 on the same radius as the optical track 65 is moved.
Can not be accessed accurately. By performing the positioning operation described above at least once when the recording medium is mounted, there is a great effect that the positional accuracy when the magnetic head 67 accesses the desired magnetic track 67 is increased with a simple configuration. It can be said that this is an important function for realizing consumer equipment that requires low cost.

As another configuration, as shown in the transverse sectional view of another traverse portion of FIG. 120, a flexible traverse connecting portion 366 such as a leaf spring and a connecting portion guide 37 for guiding it.
By connecting the optical head 6 and the magnetic head 8 by means of 5, it is possible to move them in an interlocking manner as shown by an arrow 51, and the effect of moving both heads in an interlocking manner can be obtained as in the traverse section described in FIG. 117. In this system, since the traverse connecting portion 366 is soft, the magnetic head 8 is moved to the arrow 5
It can be easily raised in the direction of 1a. Therefore, the effect of facilitating the lifting of the magnetic head 8 by the magnetic head elevating / lowering portion when the recording medium 2 is mounted is added.

117 may be arranged as shown in the transverse sectional view of the traverse in FIG. 126 so that the distance between the optical head 6 and the magnetic head 8 is always L ₀ . In this case, the optical head 6 and the magnetic head 8 move in the same direction as indicated by arrows 51a and 51b. In this case, the magnetic head 8
Since the distance between the optical head 6 and the optical head 6 can be set to be the largest, the mixed noise of the magnetic head from the optical head is reduced.
In the case of a CD, there is no great effect, but as in the case of an MD disk, the radius is small and the method described in FIG.

In the description of this embodiment, as shown in FIG. 117, the magnetic head and the optical head are set to 1 with respect to the center of the disk.
It was explained using the figure when it is arranged at an angle of 80 °.
The arrangement may be 60 °, 90 °, or 120 °. In this case, if both the heads are closest to each other and the distance between them is 10 mm or more, the mixed noise can be reduced.

Noise is reduced by combining one or more of the above three measures against mixed noise.

When the electromagnetic shield of the optical head 6 is sufficiently effective, the optical head 6 and the magnetic head 8 can be made to face each other in the vertical direction as shown in the transverse sectional view of the traverse portion in FIG. In this case also, the position reference parts 364a, 36
The provision of 4b has the effect of increasing the accuracy of alignment of both heads. This face-to-face arrangement method has the effect of downsizing because all components can be arranged on one side of the center of the disc.

Next, the recording format will be described. Since the data optical disc is CAV (constant rotation speed), the rotation speed is the same even if the radius of the optical head changes. However, when it is applied to a CDROM, the rotation of the disk becomes CLV, and the linear velocity is constant although the rotational speed varies depending on the radius of the track. In this case, recording formats such as general floppy disks and hard disks cannot be used. In the present invention, in order to increase the recording capacity when applied to the CDROM, the recording formats 370a, 370b, 370c, 370 in the recording format diagram of FIG.
As indicated by d, 370e, the data capacity of each track is set larger toward the outer circumference. A sync part 369, a track number part 371, a data part 372 having a different capacity for each track, a CRC part 373 for error check at the end are provided at the beginning of the data, and a no-signal gap part 374 is set after that. Even if the linear velocities are different from each other, the synchronizing section 369b and the like at the next head portion are prevented from being accidentally erased at the time of recording. With a CD like this, rather than having the same capacity for each track like a floppy,
This has the effect of increasing the recording capacity by about 1.5 times. Also,
Since the magnetic head performs magnetic recording and reproduction by using the rotation control of the CLV motor based on the signal of the optical head of the CD as it is, there is an effect that a motor control circuit dedicated to magnetic recording can be omitted.

Next, the physical format on the disc will be described. There are two types of physical formats: "normal mode" and "variable track pitch mode".
As shown in the physical format diagram in the normal mode on the recording medium of FIG. 123, the optical tracks 65a, 65b, 6
The magnetic tracks 67a and 67 are provided on the back surfaces of the 5c and 65d, respectively.
b, 67c, 67d are arranged, and in the normal mode, the tracks are arranged at an evenly spaced track pitch Tpo.

Further, in the present invention, the "variable angle" system is adopted. As shown in FIGS. 117 and 119, in the case of the present invention, there are various relative angles between the optical head 6 and the magnetic head 8 such as 0 °, 180 °, 45 ° and 90 °. Normally, in the conventional rotary magnetic disk type recording / reproducing apparatus, the data synchronizing portion 369 is arranged at a position on a certain angle from the center of the disk. However, in the case of the variable angle method of the present invention, as shown in FIG. 123, the arrangement angle of the synchronization unit 369 at the data start point can be arbitrarily selected. As a result, the effect that the detection means and the detection circuit for the absolute angle of the disk can be omitted is obtained. Further, since the head portion of magnetic recording can be started from a portion of an arbitrary rotation angle, in the case of a CD, data recording can be started immediately after reading specific address information of the optical recording portion such as a subcode. For this reason, at the time of reproduction, the reproduction of the synchronous portion at the beginning of the magnetic data is started immediately after reading the optical address information of the track, so there is no loss time of the rotation waiting time at the time of recording or reproducing the magnetic data, and the The great advantage is that the data access time is shortened. This method is particularly effective when the same type of recording / reproducing apparatus is used.

Next, "variable track pitch mode"
Will be described. A general ROM disk is mounted like a game machine, and at the start of the program, the TOC track is read first, the specific track recorded with the program is read, and the specific track recorded with the data is read. This procedure is the same every time when rising. For example, let's assume that a predetermined track such as the first track 65b, the 1004th track, the 65c, the 2504th track 65d, and the 3604th track 65e is accessed as shown in FIG. When the hybrid disc of the present invention is used, if the magnetic information required at the time of rising is in a magnetic track other than the magnetic track on the back side of the optical track to be accessed at the time of rising, the device is an extra magnetic track in addition to the access to the optical track. Will be accessed. Therefore, the initial rise is delayed accordingly. Further, if the track pitches in the "normal mode" are evenly spaced, the probability that the center of the magnetic track will be behind the optical track is low. Therefore, it is necessary to access a magnetic track different from the optical track, and in this case as well, the rising speed becomes slow. In the “variable track pitch mode” of the present invention, for example, the four optical tracks 6 that need to be read at the above rising
Magnetic tracks 6 on the back side of 5b, 65c, 65d, and 65e.
The feature is that 7b, 67c, 67d and 67e are defined. The track number and the address information of the optical recording portion corresponding to each track number, and in the case of a CD, the subcode information is recorded in the TOC portion of the optical recording portion or the TOC portion of the magnetic recording portion. Next, if you set to record the data to be read on the magnetic track at the time of rising, such as the number of items acquired in the game at the end of the previous time, progress tribute, score, personal name, etc. Even if the magnetic track on which the necessary information is recorded is not specially accessed, the magnetic data is automatically accessed at the time of rising and the magnetic data is read at the time of rising, so there is no loss time and the effect of significantly increasing the rising time can be obtained. . In this case, the track pitches between the tracks are Tp1, Tp2, Tp3, T as shown in FIG.
It becomes p4 and takes a random value. Therefore, the recording capacity is slightly reduced, but the use in which the rising speed is prioritized is effective.

The "variable pitch mode" and "variable angle mode" are also effective for music purposes, for example, karaoke. When the present invention is applied to karaoke, it is possible to record and store personal environment setting data such as pitch height of each individual sung song, tempo of the song, amount of echo, DSP parameters, etc. for each song. With this, once set, the karaoke CD is automatically inserted into the karaoke machine, and the music is automatically reproduced with the pitch, tempo, and echo suitable for each individual.
The effect is that you can enjoy karaoke under conditions that suit your ability and taste. In this case, the magnetic tracks on the back side of the optical tracks 65b, 65c, 65d, and 65e, which are the beginning of each song, are defined, and the magnetic tracks 67 are defined.
b, 67c, 67d, 67e are recorded with individual karaoke data relating to the song. Then the light track 65c
When a karaoke song is selected, the setting data of the individual karaoke is recorded on the magnetic track 67c on the back side of the song, and when the reproduction of a specific song is started, the pitch of the song is changed during one revolution of the disc. , Tempo and echo are set, and music is output. As described above, even in the case of music, the variable pitch mode has a great effect that both optical data and magnetic data can be quickly accessed. This is effective when used for environment setting such as a DSP sound field for each song in a portable music application.

When the present invention is applied to a CDROM, when Hc is set to 17500 e, a RAM capacity of about 32 kB can be obtained. The ROM capacity of the optical recording surface of the CDROM is 54
Since it is 0 MB, there is a capacity difference of nearly 100,000 times. Actual C
DROM products rarely use 540MB, and there is a few + MB free space even in the smallest case.
According to the present invention, various reference tables for data compression are recorded in the ROM by utilizing the free space of the ROM in this point, and the RAM is stored in the RAM.
The data recorded in the area is compressed. This method will be described with reference to the compression method diagram of FIG. In the case of a game, for example, the optical recording unit 4 has information having a strong correlation with the game content that is considered necessary in the process of programming the game,
For example, reference tables for compression such as a place name reference table 368a and a person name reference table 368b are recorded in advance. Since the free space in the ROM is large, the name of the person,
It is possible to prepare various reference tables of information such as place names, etc., which are considered to be frequently used among words and number strings. For example, "W
When the word "ashington" is recorded on the magnetic recording layer 3 which is the RAM area, the area of 80 bits is consumed as it is. However, in the case of the present invention, referring to the compression reference table 368a, "Washingto"
It can be seen that n "is defined as a binary code of" 10 ". In this case, 80-bit data is compressed to" 10 "2-bit data. By recording, it is possible to record with a capacity of 1/40. By using this compression method,
If the application is limited, data compression of 10 times or more becomes possible, and for example, the magnetic recording capacity of the 32 kB CDROM of the present invention described above becomes substantially equivalent to the magnetic disk of 320 kB magnetic recording capacity. As described above, in the case of the hybrid disc of the present invention, the ROM capacity is reduced by using the ROM area of the optical recording portion, but compression is performed, so that the substantial RAM storage capacity can be significantly increased. Specifically, Hulfman's optimal coding method and Ziv-Lempel
This can be realized by using the data compression method of, but this explanation is omitted.

Here, an example of a specific overall operation will be described with reference to the flow charts of all the operations shown in FIGS. 127 and 128.

First, with the magnetic head lifted, a disk is mounted in step 410, and the magnetic head is returned to its home position in step 411. In step 412, the optical head is TO
Moving to the C track, in step 413, TOC optical data is read. This data contains a flag indicating whether or not the optical disk has a magnetic recording portion, address information such as the subcode number of the CD corresponding to the position of each default magnetic track of the magnetic data, and the presence or absence of the variable pitch mode. . In step 414, the presence or absence of the flag of the magnetic recording layer is confirmed. If Yes, the process proceeds to step 418, and No.
Then, in step 415, the optical mark indicating the presence or absence of the magnetic recording layer on the magnetic recording surface or the like is read, and step 41
If there is no optical mark in step 6, step 417 of block 8
Jump to and do not perform any magnetic recording or playback on this disc. In step 418, the magnetic recording / reproducing mode is entered, and the magnetic track initialization step 402 is entered. In step 419, the magnetic head is lowered onto the medium surface, and in step 420, the magnetic data of the TOC is read out, and then in step 421, the magnetic head is raised to prevent abrasion. In step 422, the error flag indicating the error state of the magnetic data is checked, and in step 423a, if there is a flag, the process goes to block 5. In block 5 for instructing to clean the magnetic disk surface in block 5, the optical disk is ejected in step 427a, and in step 427b, a message "Clean the optical disk" is displayed on the display unit of the device and step 4 is executed.
Stop at 27c. On the other hand, in step 424, it is checked whether the optical address correspondence table of each magnetic track is the default value recorded on the optical recording surface side. If NO, in step 426, based on the magnetic data information of the TOC track,
Update the contents of some magnetic track one-optical address correspondence tables and save them in the internal memory of the main unit. If Yes, the reproduction block 403 of block 1 is entered.

At step 428, if there is a magnetic track read command, the process goes to block 2, and if it comes, step 4
29, the process goes to block 2 if the mode is not the variable track pitch mode, and if so, the optical track group number n is set to 0 in step 430. N in step 431
Is set to n + 1, and if n is the final value in step 432, the process jumps to step 438, and if the final value is not reached, step 4
At 33, the leading optical track of the nth optical track group is accessed. In step 434, if the default magnetic track is acceptable, in step 436 the magnetic head is moved to the medium surface as it is, in step 437 magnetic data is read and stored in the internal memory, and the process returns to step 431. On the other hand, if the optical address corresponding to the magnetic head has no default value, the optical address other than the default value is accessed in step 435, the magnetic data is read in steps 436 and 437, and the process returns to step 431. Step 431
If n is incremented by 1 in step 432 and n reaches the final value in step 432, reading of optical data and reading of magnetic data is completed in step 438. Therefore, in the case of a game machine, the game program is started, and the magnetic recording unit is recorded. Based on the recorded data, the previously finished game scene is reproduced. At step 439, the magnetic head is raised to the internal “memory rewrite” block 405 of block 3.

Now, returning to step 429, if it is not the variable track pitch mode, the process jumps to the normal track pitch mode 405 of the block 2. If it is not the normal track pitch mode in step 440, the process jumps to block 3, and if Yes, in step 411, an access command for the nth magnetic track is received, and step 44 is executed.
At 2, wait for the optical address corresponding to the nth magnetic track in the internal memory of the microcomputer 10, and then step 443.
Then, immediately after accessing this optical address, step 4
The magnetic data is read at 44, stored in the internal memory at step 445, and the process jumps to block 3. In the rewriting step 405 of block 3, in step 446, it is checked whether or not there is a rewriting command.
5 and if Yes, check in step 447 if it is the final accumulation instruction, and if Yes, go to block 5 and "N".
If "o", the process proceeds to step 448. At step 448, it is checked whether the magnetic data to be rewritten exists in the internal memory of the main body. If "Yes", the process jumps to step 454, magnetic recording is not performed, and only the internal memory is rewritten. If "No", the optical track one-optical address correspondence table is checked in step 449 to access a specific optical track, the magnetic head is lowered in step 450, and step 4
At 51, 452 and 453, the magnetic data is read out, stored in the internal memory, and the magnetic head is raised. At step 454, the information transferred to the internal memory is rewritten, and the process goes to block 4.

Final accumulation block 406 of block number 4
First, in step 455, it is checked whether it is the final accumulation instruction. If "No", in step 458, if the work is completed, the process jumps to block 6, and if the work is not completed, the process jumps to block 1 and returns. If Yes in step 455, in step 456, it is checked whether or not there is updated data in the magnetic data in the internal memory, only the updated portion is extracted, and if there is no update in step 457, the process proceeds to step 458,
If there is an update, the optical address of the corresponding magnetic track is accessed in step 459, and steps 460, 470, 4 are executed.
At 71, the magnetic head is lowered, magnetic data is recorded immediately after the detection of the optical address, and the recorded data is checked. If the error rate is large in step 472, the process jumps to the magnetic head cleaning block 408 of block 7, and step 48
The magnetic head is raised at 1 and 482, the magnetic head is cleaned by the head cleaning unit, recording is performed again at step 483, the error rate is checked, and if OK, the process goes to block 1, and if not, the magnetic disk at block 5 is cleaned. Jump to the instruction block.

Returning to step 472, if the error rate is small, it is checked in step 473 whether recording is completed. If "N0", the process returns to step 470. If the result is Yes, the magnetic head is raised in step 474, and in step 475 the entire recording is completed. If the work is completed, the process proceeds to the end block of block 6, and if not completed, the process returns to block 1.

At the end step 407 of this block 6, the magnetic head is raised at step 476, the magnetic head is cleaned at the magnetic head clean portion at 477, and if there is an EJECT command at step 478, the optical disk is ejected at step 479. , EJECT does not need to be stopped at step 480. The recording / reproducing apparatus according to the thirteenth embodiment of the present invention operates according to the above flow chart.

The mixed noise is reduced even if a band filter having the same band as the frequency distribution of the reproduction signal of the magnetic head is added to the drive circuit of the actuator 18. Also, the electromagnetic noise is reduced by accessing the magnetic track and then turning off the drive current of the actuator of the optical head 6, reproducing by the magnetic head 8b, and starting the driving of the actuator at the end of reproduction.

Many existing CDs have a thick printing ink applied on the back surface by screen printing or the like, and have a thickness of several tens of μm.
There are irregularities. If the magnetic head 8 is brought into contact with such a CD, the printing ink on the uneven portion may drop off and be damaged. When the recording medium 2 having the magnetic shield layer 69 is inserted, as shown in the ON state of the cross-sectional view of FIG. 115 when the recording medium is inserted, there is no magnetic shield layer 69 as shown in the OFF state. Electromagnetic noise from the actuator of the optical head 6 is significantly reduced as compared with the case where the recording medium 2 is inserted. This noise is output from the magnetic head reproducing circuit 30 and can be easily detected. That is, the recording medium of the present invention and the conventional recording medium such as a CD can be discriminated without contacting the magnetic head 8 with the magnetic recording layer 3. Then, the magnetic head 8 is brought into contact with the back surface of the recording medium having no magnetic recording layer such as CD or LD by bringing the magnetic head 8 into contact with the recording surface only when the recording medium having the magnetic recording layer of the present invention is inserted. Therefore, there is an effect that it is possible to prevent the printed matter on the back surface and the optical recording surface from being damaged by the magnetic head. As another method, referring to FIG. 111, the TOC of the optical recording portion of the CD
A discriminating code indicating the presence of the magnetic recording layer of the medium is recorded in advance in the portion, the optical TOC is first read without the magnetic head 8 coming into contact with the medium, and the magnetic head 8 is read only when the magnetic layer discriminating code is detected. Grate on the surface. By this method, since the magnetic head 8 does not contact when the existing CD is inserted, the existing CD is prevented from being damaged. A specific optical mark may be provided on the printed surface of the optical disc, and the presence of the magnetic recording layer may be determined only when the mark is present.

(Embodiment 14) A recording / reproducing apparatus according to a fourteenth embodiment of the present invention will be described below with reference to the drawings. 131 is a configuration diagram of a recording / reproducing apparatus showing an embodiment of the first invention, FIG. 132 is a detailed configuration diagram of the recording / reproducing apparatus showing an embodiment of the first invention, and FIG. 133 is a diagram. Thirteen
FIG. 134 is a configuration diagram when the drive current control in the second embodiment is a current supply stop type, FIG. 134 is a process procedure diagram of the signal processing means in FIG. 132, and FIG. 135 is a process procedure diagram similar to FIG.

In FIG. 131, reference numeral 1001 denotes a magnetic head for recording / reproducing signals in / from the magnetic recording area.
Reference numeral 1200 is an optical pick unit including an optical head capable of reproducing at least a signal from the optical recording area and a mechanism for magnetically controlling tracking and focusing. Reference numeral 1200 is a recording medium having a magnetic recording area and an optical recording area. Medium 1
Reference numeral 1301 denotes a recording medium 1 in a magnetic recording area 200.
In the optical recording area 200, 1400 is a magnetic area signal processing means and 1401 is an optical area signal processing means.
2 is a control stop means, 1403 is a control means, 1404
Is a control stop command. In FIG. 132, 1001 is a magnetic head for recording / reproducing a signal on / from a magnetic recording surface.
Reference numeral 1002 is noise coming from the optical pick to the magnetic head.
1003 is a focusing coil for controlling the distance of the optical head to the optical recording surface, 1004 is a tracking coil, 1005 is an optical head, and 1006 is a magnetic head for recording / reproducing a signal on / from the magnetic recording surface. Recording / reproducing means 1007 is a focusing servo control means 1008, and tracking servo control means 1008 is a tracking servo control means for controlling the tracking of the optical head with respect to the optical track.
Reference numeral 09 is an optical signal reproduction processing means for reproducing a signal from the optical head and processing the signal, and 1010 is a signal processing means.
0 is a magnetic recording / reproducing signal, 1021 is a writing signal,
1022 is a read signal, 1023 is a drive stop command, 1024 is also a drive stop command, 1025 is a focusing error signal, and 1026 is a tracking error signal. In FIG. 133, 1001 to 1009
132 is the same as in FIG. 132, and 1011 is a head amplifier.
12 is a switch circuit, and 1025 to 1026 are shown in FIG.
Similarly, 1027 is a power supply stop signal which is the same signal as the drive stop command.

Regarding the recording / reproducing apparatus having the above-mentioned configuration, the following will be described with reference to FIGS. 131, 132, 133, and 13.
The operation will be described with reference to FIG.

As shown in FIG. 131, the optical pick section 111 is provided.
When 0 and the magnetic head 1001 are arranged close to each other, electromagnetic induction occurs between the coils arranged on both sides. In FIG. 131, the control stop means 1402 is provided to eliminate the noise to the magnetic head 1001 side due to this electromagnetic induction. The control stop means 1402 stops the control based on the control stop command 1404 sent from the magnetic area signal processing means 1400. Run. FIG. 132 describes the configuration of FIG. 131 in more detail. The configuration of FIGS. 132 and 133 is the same as that of FIG.
Used under the structure of. Generally, the optical pick unit 1110 includes an optical head 1006, a focusing coil 1003, and a tracking coil 1004. The tracking coil 1004 is prepared for causing the optical head 1005 to follow the eccentricity generated when the disc is mounted. FIG. 14 shows a means for moving the truck.
The feed motor 1202 shown by 1 is used. When the conventional optical pick unit 1110 and the magnetic head 1 are arranged close to each other, noise 1002 generated from the focusing coil 1003 and the tracking coil 1004 reaches the magnetic head 1001 and reproduction by the magnetic head 1001 is impossible. Becomes As a result of an experiment using a conventional optical pick for a CD and a conventional magnetic head for a flexible disk device, it was found that the reproduced signal on the magnetic recording surface was completely masked by noise 1002, which made it difficult to reproduce. The noise 1002 becomes large especially when disturbance vibration is applied to the device. When the head position moves due to disturbance vibration,
To correct this, a drive current is supplied to the coil from the servo means. At this time, a lot of noise 1002 is generated and reaches the magnetic head 1001. The largest disturbance vibration during steady operation is the disk motor 1210 that rotates the recording medium.
It is a vibration caused by. FIG. 132 shows a configuration having a function of stopping the noise 1002 from flying. The signal reproduced from the magnetic head 1001 is recorded / reproduced by the recording / reproducing means 1.
It is sent to the signal processing means 1010 via 006. The signal processing means 10 sends a write signal 1021 and a read signal 1022 to the recording / reproducing means 1006 and controls them. The signal processing means 1010 has a function of managing the recording / reproducing timing with respect to the magnetic recording surface. Using this recording / reproducing timing, the magnetic head 1
By stopping the power supply to the optical pick unit 1110 before using 001, the influence of noise 1002 on the magnetic head 1001 can be eliminated. The drive stop commands 1023 and 1024 shown in FIG. 132 mean the power supply stop. Focusing servo control means 1007 and tracking servo control means 1008
Receives the drive stop commands 1023 and 1024 to stop the current supply to the coil. The noise 1002, which is a problem, is generated when an alternating current is supplied to the coil. Therefore, the focusing coil 1003 and the tracking coil 1
The noise 1002 is eliminated by cutting off the current supplied to 004 or maintaining it at a constant current. The focusing servo control means 1007 and the tracking servo control means 1008 have a function of interrupting the current or maintaining it at a constant current.

FIG. 133 is a block diagram showing a case where the drive current control in the embodiment of FIG. 132 is of the current supply stop type.
The recording / reproducing means 1006 pays attention only when reproducing, and only the head amplifier 1011 is described. In FIG. 133, the switch circuit 1012 has a function of stopping the current supply to the focusing coil 1003 and the tracking coil 1012.
In FIG. 132, this function is described by being included in the focusing servo control means 1007 and the tracking servo control means 1008. As is apparent from FIG. 133, the magnetic head 1001 is stopped by stopping the current supply to the coil.
No noise 1002 is generated. However, after the switch circuit 1012 is disconnected by the power supply stop signal, the current is attenuated on the coil side with a predetermined transient response waveform. Recording / reproduction on the magnetic head 1001 side is performed after a time interval considering this attenuation. It can be considered that the focusing coil 1003 and the tracking coil 1004 and the magnetic head 1001 electrically form a transformer. Therefore, the noise caused by the write current of the magnetic head 1001 is generated by the focusing coil 1003 and the tracking coil 1.
In some cases, the control performance may be deteriorated by jumping to 004. In this case, this effect can be avoided by stopping the current supply to the magnetic head 1001 when reproducing by the optical head 1005.

As is apparent from the above description, the first invention cannot adopt the method of controlling the magnetic head 1001 by using the position information obtained from the optical head while the magnetic head 1001 is operating. The positioning procedure shown in FIGS. 134 and 135 shows a control method including a method of positioning the magnetic head 1001. 134 and 135
14 shows a procedure for positioning the magnetic head 1001 based on the structure shown in the conventional example of FIG. Figure 1
In 34, the magnetic head 1001 and the optical head 1005 are connected, and it is premised that the head movement is realized by one feed motor. That is, the magnetic head 100
In order to move the magnetic head 10, first the optical surface is used to move the magnetic head 10
Move 01. When the optical recording surface is a CD, the positioning can be performed by using a subcode area in which performance time information is stored. Next, the power supply to the feed motor (described as a DC motor in the figure) is stopped, and further the power supply to the optical pick is stopped. After this, recording / reproduction is performed by the magnetic head. By stopping the power supply to the feed motor and the power supply to the optical pick, the influence of the noise 1002 described above can be eliminated. When the optical recording surface is a CD, the track has a spiral shape. Therefore, when performing tracking servo control on the optical recording surface, the optical head 1005 continues to move from the inner circumference to the outer circumference of the recording medium. This movement is eliminated by stopping the power supply to the feed motor. In this case, the magnetic head 100
Position 1 is mechanically fixed by a lead screw 1201 or the like. In this case, the influence of the power supply stop signal to the feed motor is also important. For example, if spike noise is mixed in the feed motor due to the stop signal, a position error will occur. That is, power supply must be stopped so that the rotation angle of the feed motor does not change. The same applies to stopping the power supply to the optical pick. Figure 1
Reference numeral 35 shows a procedure when a stepping motor is used as the moving means of the magnetic head 1001.
The magnetic head 1001 can be easily positioned on the magnetic recording surface by using a motor that performs a step operation. In this case, the head can be moved with a steel belt or the like without using the lead screw. Figure 1
35 is premised on the case where the magnetic head 1001 and the optical pick are connected and there is only one moving feed motor. As shown in FIG. 135, the optical pick is first fixed. The reason for fixing is to prevent the inside of the optical pick unit from vibrating after the movement. As a fixing method, there is a method of sticking the tracking coil and the focusing coil in one direction by feeding power. After that, the stepping motor moves a predetermined number of steps. Next, power supply to the optical pick unit is stopped, and thereafter, recording / reproduction is performed by the magnetic head 1001. However, when accessing the CD side,
It is necessary to perform access control using a stepping motor. This is not necessary when preparing two independent feed motors as shown in FIG. 142. Further, it is not necessary to fix the optical pick shown in FIG.

The first embodiment of the present invention has an effect of eliminating mutual noise caused by coupling between the coil existing in the optical pick section and the coil provided in the magnetic head 1001. The noise flying to the magnetic head 1001 may be magnetic noise generated from a magnetic material, noise generated from a semiconductor, or the like, in addition to such coil coupling. In the first aspect of the invention, the influence of the magnetic substance cannot be eliminated, but the noise generated from the semiconductor or the like can be eliminated as well. That is, when recording / reproducing a signal using the magnetic head 1001, this is achieved by stopping the power supply to all unnecessary circuits including the optical pick unit.

There is a magneto-optical recording device as another storage device using light and magnetism. In the case of magneto-optical recording, its arrangement is shown in FIG.
41 has something in common. That is, it looks like the same structure in that the optical pick is arranged on one surface and the magnetic head is arranged on the opposite surface. In the case of magneto-optical recording, recording is performed by cooperating the magnetic head and the optical head. When writing, the magnetic field generated by the magnetic head is applied to the magneto-optical recording medium, and the medium is heated with a laser beam from the opposite side,
By making the medium temperature equal to or higher than the Curie temperature, the magnetization direction of the medium coincides with the direction of the magnetic field of the magnetic head. When reproducing, the Kerr rotation effect of light or the Faraday effect is used. As described above, in the conventional magneto-optical disk, the cooperative operation of the magnetic head and the optical head is indispensable, and the method of stopping the power supply to one cannot be adopted. Further, the magnetic head side is used for writing and is less susceptible to noise as compared with the method of the present invention in which reproduction is performed using the magnetic head. The present invention mainly aims to eliminate the influence of noise when reproducing using a magnetic head, and focuses on the point that it has not been a problem in the conventional magneto-optical disk.

The recording medium of the second invention will be described below with reference to the drawings. FIG. 136 is a three-dimensional sectional view of a recording medium showing an embodiment of the second invention, FIG. 137 is a structural view of a noise shielding layer, and FIG. 138 is an example of an experimental result regarding the structure of FIG. In FIG. 136, 1050
Is a printed layer, 1051 is a magnetic layer, 1052 is a noise shielding layer, 1053 is a reflective film, 1054 is transparent plastic, and 1055 is a pit for optical information.
In FIG. 137, 1051 to 1054 are the same as in FIG. 136, 1060 is a conductor layer, and 1061 is a non-conductor layer.

The operation of the recording medium having the above structure will be described below with reference to FIGS. 136 and 137.

The CD has a protective layer and a printed layer on the reflective film 1053. Aluminum is generally used as the reflective film and has a thickness of about 1 micrometer. According to the experiment, in the reflective film of the CD, the optical pick 1110 to the magnetic head
It turned out that the noise to 207 cannot be shielded. Based on this fact, as a result of various experiments, it was found that the noise component in the required frequency band can be eliminated by providing a noise shielding layer made of a conductive material in addition to the aluminum reflection film. . It has been found that the effect of stacking a conductive material and a non-conductive material is great. FIG. 136 shows a structure in which a noise shielding layer 1052 is provided between a reflection film 1053 which is an optical recording layer and a magnetic layer 1051 which is a magnetic recording layer in order to realize the above effect. As a noise shielding layer,
Conductors such as aluminum and copper are preferred. Especially when aluminum is used, it can easily serve as a noise shielding layer. A ferromagnetic material such as permalloy may be used as the conductor. The problem with this configuration is the thickness of the noise shielding layer 1052. According to the experiment, 5 micrometers or more is required. As a method for forming the noise shielding layer 1052, a method of increasing the film thickness in an aluminum vapor deposition step, a method of simultaneously coating conductive fine particles in a step of spin coating a resin after the aluminum vapor deposition step, and a method of forming a conductive layer as a kind of a printing layer in a printing step There is a method of forming the noise shielding layer with a printing liquid containing the functional fine particles. In any case, as described above, the noise shielding layer 105
By optimizing the thickness of 2 or the laminated structure thereof, good noise shielding characteristics can be obtained. FIG. 137 is a structural diagram when the noise shielding layer 1052 has a laminated structure. The conductor layer 1060 can be formed in the same step as the reflective film 1053. FIG. 138 shows a measurement of the number of stacked layers and noise shielding characteristics when copper is used as the conductor layer. A CD was used as the optical pick, and a flexible disk device was used as the magnetic head. The copper thickness used in the experiment is about 6 micrometers. As shown in FIG. 138, it can be seen that the shielding effect increases depending on the thickness of the noise shielding layer 1052 or the number of stacked layers. Moreover, the effect of the noise shielding layer 1052 becomes more remarkable as the frequency becomes higher. 250 kHz
The following are less effective.

The recording / reproducing apparatus of the third invention will be described below with reference to the drawings. FIG. 139 is a structural diagram of an optical pick section used in a recording / reproducing apparatus showing an embodiment of the third invention. In FIG. 139, 1101 is an objective lens, 1102 is a tracking coil, 1103 is a focusing coil, 1104 is a suspension / lead wire, 1105 is a yoke, 1106 is a magnet,
Reference numeral 1107 is a yoke, 1108 is a cover, 1109 is a noise shielding layer, and 1110 is an optical pick portion.

The operation of the recording / reproducing apparatus having the above structure will be described below with reference to FIG. 139.

The objective lens 1101 is mechanically connected to and integrated with the tracking coil 1102 and the focusing coil 1103. This coil and magnet 1106
Tracking control and focusing control are performed using the force that acts between the two. That is, it is a moving coil type.
A noise electromagnetic wave is generated by passing a control current through the tracking coil 1102 and the focusing coil 1103. This noise greatly differs depending on the driving method of the current flowing through the coil. For example, the noise component is smaller in the method of converting a digital signal into an analog signal called the D / A conversion method than in the case of driving by a pulse width modulation type called the PWM method. As shown in the figure, the cover 1108
The noise generated from the coil can be reduced by providing the noise shielding layer 1109 inside. According to the experiment, when copper is used as the noise shielding layer 1109, it is about 3-5.
We were able to improve dB (decibels). Although the noise shielding layer 1109 is provided inside the cover 1108 in the figure, it may be provided outside. When the cover is made of resin, the resin may include a noise shielding member. Figure 1
The noise shielding structure shown in 39 is a shielding structure using the cover 1108, but as another structure, a yoke 1105.
Noise can also be shielded by changing the shapes of 1 and 1107 so as to wrap the coil. There is also a method of providing a noise shielding layer in the recording medium as described in the above invention. There is also a method of providing a noise shielding layer on the magnetic head side.

The recording / reproducing apparatus of the fourth invention will be described below with reference to the drawings. FIG. 140 is a structural diagram of a recording / reproducing apparatus showing an embodiment of the fourth invention. In FIG. 140, 1110 is an optical pick portion, 1200 is a recording medium having a magnetic recording surface and an optical recording surface, 1201 is a lead screw, 1202 is a feed motor, and 12
Reference numeral 03 denotes a connecting arm, 1205 a supporting member for supporting the magnetic head, 1206 a connecting shaft for connecting the supporting member and the connecting arm while keeping the movable state, and 1205 a guide rail for assisting the movement of the connecting arm 1207. Is a magnetic head, and 1210 is a disk motor for rotating the recording medium.

The operation of the recording / reproducing apparatus having the above structure will be described below with reference to FIG.

When recording / reproducing information on / from a disc-shaped recording medium, movement in the track direction (radial direction) is an important basic operation. That is, the operation of positioning the head in the radial direction of the recording medium is required. However, as described above, when the optical head and the magnetic head are in a position where they face each other, there is a problem that the influence of noise flying from the optical pick portion to the magnetic head causes a problem, and it becomes difficult to reproduce a signal by the magnetic head. As a method of solving this, a method of increasing the distance between the noise source and the receiving unit can be considered. In the case of the method of positioning the optical head and the magnetic head by independent moving means, this problem can be easily solved. However, in this case, there is a problem that two independent moving means are required and the apparatus price becomes high. The fourth invention solves this problem, solves the problem of noise, and realizes further cost reduction.
In FIG. 140, the magnetic head and the optical head can be simultaneously moved by one moving means. In addition, the magnetic head and the optical head are separated by a certain distance. In the figure, the lead screw 1201 rotates as the feed motor 1202 rotates. This rotating operation moves the connecting arm 1203. Connecting arm 120
The magnetic head 1207 and the optical pick 1110, which are mechanically connected to the recording medium 3, move in the radial direction with respect to the recording medium 1200 to form tracks. As is clear from the figure, when the optical pick unit 1110 is located on the outer circumference, the magnetic head 1207 is located on the inner circumference, and when the optical pick unit 1110 is located on the inner circumference, the magnetic head 1207 is located on the outer circumference.
Thus, by arranging the head at a position of 180 degrees with respect to the rotation axis of the recording medium, it becomes possible to move the two heads at the same time. If this arrangement is, for example, 90 degrees, normal tracks cannot be formed simultaneously on both recording surfaces. Further, by arranging at a position of 180 degrees in this way, it is possible to record and reproduce a signal in the magnetic head 1207 and reproduce a signal in the optical head at the same time. That is, the problem regarding noise generated between the magnetic head 1207 and the optical pick unit 1110 can be solved by increasing the distance.
By using this function, it is possible to configure a control loop for preventing eccentricity of the recording medium 1200. For example, by using a tracking error signal detected from the optical head and feeding back this low-frequency component to the feed motor, suppression control for eccentricity and disturbance vibration can be performed.
By using such a method, the track interval on the magnetic recording surface can be set small, and the storage capacity on the magnetic recording surface can be increased. As in the case of the invention described above, in the case of the configuration in which the power supply to the optical pick unit 1110 is stopped when recording / reproducing with the magnetic head 1207, the eccentric disturbance suppression control cannot be performed.

Although the first to fourth embodiments of the present invention have been described focusing on those handling a rotary recording medium, they may be card-shaped or tape-shaped. Also, the first to the fourth
A method of improving the characteristics by a configuration in which the inventions of 1) are combined may be adopted.

As described above, the first aspect of the present invention is provided with the signal processing means for stopping or keeping constant the power supply to the optical pick when recording / reproducing a signal on the magnetic head side.
It has the effect of eliminating the noise flying from the optical pick section to the magnetic head. The second aspect of the present invention has the same noise eliminating effect as described above by providing the noise shielding layer between the optical recording layer and the magnetic recording layer. The third aspect of the present invention has the same noise eliminating effect as described above by disposing the noise shielding member between the magnetic head and the optical pick section. According to the fourth aspect of the present invention, by arranging the magnetic head and the optical pick section at a position of 180 degrees with respect to the center of rotation of the recording medium, it is possible to achieve the noise elimination effect and the cost reduction similar to the above.

According to the present invention, by using an inexpensive pickup used in a compact disc and an inexpensive magnetic head used in a magnetic disc device, a recording / reproducing device which is less expensive than a conventional writable optical disc device. It has become possible to create

(Embodiment 15) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that components having the same effects as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 142 is a block diagram showing the first embodiment of the recording / reproducing apparatus of the present invention. In FIG. 142, only one side is used for recording information such as voice and images, and the other side (commonly referred to as label side) is only printed to show the content. Therefore, magnetic coating or F
By adding a magnetic medium such as D, recording becomes a new medium that can be recorded. Also, in the case of MO, since only one side is used for information recording due to its structure, it is possible to use both sides by the same method. The present invention relates to such a novel hybrid medium (hereinafter referred to as HB) and a recording / reproducing device (hereinafter referred to as HB device) having an optical reproducing means and a magnetic recording / reproducing means using the HB.

That is, the hybrid medium 2031 has an optical recording surface and a magnetic recording surface, and this hybrid medium 2031 can be replaced with an apparatus. The magnetic head 32 performs writing (recording) and reading (reproduction) on the magnetic recording surface of the hybrid medium 2031 and is held by the support mechanism 2033. Further, the magnetic head feed mechanism 2034 to which the support mechanism 2033 is connected moves the magnetic head 2032 in the radial direction of the hybrid medium 2031 via the support mechanism 2033. The drive source of the magnetic head feeding mechanism 2034 may be shared with the optical head feeding mechanism 2012 or may be different from it. Further, the signal processing circuit 2035 records and reproduces information via the magnetic head 2032. Further, the magnetic head elevating mechanism 2036 includes a magnetic head elevating circuit and elevates the magnetic head 2032 with respect to the hybrid medium 2031 via the support mechanism 33. The magnetic head feeding mechanism 2034, the signal processing circuit 2035, and the magnetic head elevating mechanism 2036 are connected to the drive controller 2037, and the drive controller 2037 controls the respective parts so that the optical recording surface of the hybrid medium 31 can be moved through the optical head 2011. If detected, the magnetic head lifting mechanism 2036 determines that the magnetic head 2032
Can be moved to a position where information can be recorded and reproduced.

With the above configuration, when the hybrid medium 2031 is mounted on the apparatus, the optical head 2011
It is determined whether or not the optical recording surface is in a predetermined direction, and if it is properly mounted, the magnetic head elevating mechanism 2036 causes the magnetic head 2032 to contact the magnetic recording surface of the hybrid medium 2031. To enable that. Further, when the hybrid medium 32 is mounted in the direction opposite to the determined direction, the head lifting mechanism 2036 prevents the magnetic head 2032 from contacting the magnetic recording surface of the hybrid medium 2031.
Magnetic head 2032 or hybrid medium 2 due to erroneous operation
Prevent 031 damage.

FIG. 143 shows the first part of the recording medium of the present invention.
3 is a partial cross-sectional view of HB showing the embodiment of FIG. In FIG. 143, a protective coat layer 2005 for protecting the reflective film 2004
A magnetic layer 2038 for magnetic recording is provided on the top.
Since this magnetic layer 2038 also serves as a protective layer for the reflective film 2004, the protective coat layer 2005 can be omitted. The hybrid medium 2031 used in the recording / reproducing apparatus of FIG. 142 is configured as described above and has an optical recording surface and a magnetic recording surface.

(Embodiment 16) FIG. 144 is an external view of an HB showing the 16th embodiment of the recording medium of the present invention.
In FIG. 144, on the magnetic recording surface of the hybrid medium 2041, the mark 20 as surface information indicating the magnetic recording surface displayed by the writing means such as printing is displayed.
42 are provided. The hybrid medium 2041 can be obtained by printing the mark 2042 on at least one place on the same circumference by printing or the like.
It can also be used to detect the rotation cycle of.

FIG. 145 is a block diagram showing the sixteenth embodiment of the recording / reproducing apparatus of the present invention. In FIG. 145, the reflected light detection type optical sensor 2051 is a mark 20 which is a mark on the magnetic recording surface of the hybrid medium 2041.
42 is detected. The surface signal identification circuit 2052 to which the optical sensor 2051 is connected is a drive controller 205.
The three surfaces are connected, and the surface of the hybrid medium 2041 is identified based on the signal from the optical sensor 2051. By replacing the portion of the optical medium surface identification method in FIG. 142 with this embodiment, it is possible to prevent damage to the magnetic head 2032 and the medium due to an erroneous operation as described above.

(Embodiment 17) FIG. 146 shows the seventeenth embodiment of the present invention.
3 is an external view of a recording medium showing the example of FIG. In FIG. 146, the medium identification information 2061 is provided on the reflective film 2003 of the recording medium 2062. Reflective film 200 in this part
The medium identification information 2061 is represented by deleting a part of No. 3 or performing a process of changing the reflectance. In this way, since the medium identification information is provided in the reflection film 2003 of the inner layer of the medium, the conventional medium configuration is not changed,
Face identification and the like can be performed more reliably and easily.

FIG. 147 is a block diagram showing the seventeenth embodiment of the recording / reproducing apparatus of the present invention. In FIG. 147, the optical sensor 2071 detects the medium identification information 2061 on the magnetic recording surface of the recording medium 62. The medium identification circuit 2072 to which the optical sensor 2071 is connected is connected to the drive controller 2073, and the optical sensor 2
The surface of the recording medium 2062 is identified based on the signal from 071. Here, the optical sensor 2071 used may be a reflective type or a transmissive type. Further, by replacing the part of the optical medium surface identification method in the embodiment of FIG. 142 with this embodiment, it is possible to prevent the magnetic head 2032 and the medium from being damaged due to an erroneous operation.

As described above, according to the present invention, the magnetic means serves as the magnetic recording surface only when the recording medium having the optical recording surface and the magnetic recording surface is mounted in a predetermined state in the apparatus. By enabling contact and not contacting in other cases, damage to the recording medium and magnetic means due to erroneous operation can be prevented.

Further, since the surface information for surface identification is provided on the magnetic recording surface of the recording medium, the surface identification can be performed more reliably and easily. Further, by providing the surface information detecting means for detecting the surface information provided on the recording medium, it is possible to accurately identify the recording medium mounted on the apparatus, and to prevent the recording medium and the magnetic means from being erroneously operated. Damage can be prevented.

Furthermore, since the medium identification information is provided in the reflection film portion without changing the conventional medium structure, the surface can be identified more reliably and easily. Further, by providing the detection means for detecting the surface identification information provided on the recording medium, the type and surface identification of the recording medium mounted on the apparatus can be accurately performed, and the recording medium and the magnetic field due to an erroneous operation can be detected. It is possible to prevent damage to the mechanical means.

(Eighteenth Embodiment) An eighteenth embodiment will be described with reference to the drawings. FIG. 154 shows a block diagram of a recording / reproducing apparatus in Example 18 of the present invention. In this embodiment, recording or reproduction is performed in the magnetic recording unit 3 by performing modulation or demodulation based on the optical clock signal 382 of the optical recording / reproduction signal on the optical recording surface of the recording medium 2. Since the basic operation is the same as that in the case of FIG. 110, detailed description of the entire operation is omitted. In FIG. 154, in the clock recovery circuit 38a in the optical recovery circuit, the optical clock 382 is output from the optical recovery signal.
Is played. This optical clock 382 is frequency-divided, and the clock circuit 29a in the magnetic recording circuit 29 is subjected to frequency division as shown in FIG.
The magnetic clock signal 383 shown in FIG. 155 is generated and serves as a clock for the modulation of the modulation circuit 334. At the time of reproducing the magnetic signal, the magnetic clock signal 383 is reproduced by the clock circuit 30a of the magnetic reproducing circuit 30 and serves as a clock for demodulation by the demodulation unit 30a.

As shown in FIG. 155, the rotation speed ω of the recording medium 2 largely changes due to rotation unevenness of the motor called wow and flutter. When the magnetic recording clock is fixed, the magnetic recording signal recording wavelength λ on the recording medium 2 varies variously due to the above variation even on the same track. As shown in FIG. 155 of the present invention, a magnetic clock 383 is generated by dividing the optical reproduction clock 382 by frequency division or the like, and magnetic recording is performed. Can be recorded. Therefore, there is an effect that reliable recording can be performed at the shortest recording wavelength. Further, since the recording signal can be accurately arranged in one track of the recording section for recording one rotation, the guard gap section 374 for preventing the overlapping recording described in FIG. 123 can be set to the minimum. Even when reproducing the magnetic signal, the demodulated clock can be accurately reproduced by dividing the optical clock signal as shown in FIG. Therefore, the range of the demodulation determination window time 385 during reproduction can be set narrow. Therefore, there is an effect that the data discrimination ability is improved and the error rate is improved.

The recording capacity can be doubled or tripled by using this optical recording / reproducing clock. Normal 2
In the value recording, only 1 bit can be recorded in one symbol as shown by Data1 in FIG. However, in Fig. 152, re
The optical clock signal 382 as shown in the process2.
It is possible to apply the time width modulation of the magnetic recording signal 384, that is, PWM by using the accurate time Top of the above. By magnetically modulating the waveform of one symbol, the magnetic recording signal 384
By assigning four values of 00, 01, 10 and 11, that is, 2 bits to four time widths of a, 384b, 384c, and 384d, the recording data amount can be increased because the number increases from 1 bit to 2 bits per symbol. it can. In this case, as shown in the signal 384d, the uniform period To
When recorded at, λ / 2 is t ₃ '-t ₃ = To as shown in the figure.
-DT, which is the shortest recording wavelength, that is, the shortest recording period Tm.
Since it is less than in, normal recording cannot be performed. Therefore, shifting the magnetic clock only dT where t = t ₃ of the magnetic recording signal 384d as a new starting point. Then, t ₄ = t ₃ '
determination window 384 next to dT times to determine the 00 Data2, t _5, t _6, when the pulse t _7,
Data of 01, 10, 11 and 2 bits are demodulated.

Thus, it is 1 for binary recording such as NRZ.
Although only 1 bit can be recorded per symbol, 2 bits can be recorded according to the present invention. When the modulation width of the pulse width modulation is 8 kinds, it is 3 bits per symbol, and when it is 16 kinds, it is 4 bits per symbol. This is because the wavelength of the optical recording is 1 μm or less, whereas the wavelength of the magnetic recording of the present invention has a lot of space loss, so that it is 10 μm to 10 μm.
Since it is 0 μm, there is a wavelength difference of several tens to 100 times. Therefore, there is an effect that the pulse interval of the magnetic recording signal can be measured by using the clock signal of the optical signal with a resolution of several tenths to one hundredth of the wavelength of the magnetic recording signal.
From this, the recording capacity theoretically becomes several tens to 100 times the recording capacity of the binary recording due to the combination of the PWM and the optical signal clock. Actually, a recording capacity of several times to several tens of times can be obtained due to waveform distortion of magnetic recording.

In this way, the first method has an effect that the recording can be always performed at a constant recording wavelength by using the accurate optical recording clock signal recorded in the CDROM as the reference clock signal. In the second method, the recording capacity can be increased from several times to several tens of times by performing PWM (pulse width modulation) using the optical recording clock signal as a reference signal.

Next, the method of detecting the area of the magnetic recording portion in advance and preventing the magnetic head from being destroyed will be described in more detail. The area of the magnetic recording portion of the recording medium 2 of the present invention varies depending on the application. CD ROM for games and CD for personal computers
Since the ROM requires the first recording capacity, the recording area of each track is set on the entire surface of the recording medium 2. On the other hand, the amount of information required to record the music title, the music order, and the like on the music CD may be about several hundred B. In this case, since the recording area of one track to several tracks is sufficient, the remaining portion of the CD can be printed with many irregularities such as screen printing. In this case, when the magnetic head comes into contact with a print area having many irregularities such as the screen printing, both are damaged. In order to avoid this damage, an optical mark 387 is provided on the magnetic recording surface side of the recording medium 2 as shown in the sectional view of the magnetic recording apparatus of FIG. The optical mark 387 is optically printed such as a bar code indicating the size of the magnetic recording area.
By the optical sensor 386 provided on the magnetic head 8 side,
Data such as the barcode of the optical mark 387 can be read. Data reproduction of the barcode can be easily performed by a conventional method. The optical mark portion 387 is provided on the TOC portion of the CD, but by providing it on the inner peripheral portion of the TOC portion,
The magnetic head 8 has an effect of preventing stains.

From the bar code of the optical mark 387, C
The information indicating the area (r = 1m) in the radial direction of the magnetic recording layer of D, the value of Hc of the magnetic recording material, the encryption information for the copy card, and the ID No. of the CD. The information is played. In this way, the magnetic head 8 can be prevented from coming into contact with the recording medium 2 other than the region of the magnetic recording layer, so that the above-mentioned destruction of the magnetic head can be prevented.

Next, another structure of the optical mark will be described. CD
In the case of 1, the optical recording portion is usually not provided on the inner peripheral portion of the TOC. A light transmitting portion 388 having no optical recording layer is provided in the area having no optical recording portion as shown in FIG. Then optical mark 3
The back side of 87 is visible from the optical head 6 side through the light transmitting portion 388. By printing an optical mark such as a barcode on the recording medium side of the optical mark 387, the optical mark 387 can be read by the optical head 6. This method has an effect that the optical sensor 386 can be omitted. Another way to read is the optical sensor 38
6 can be provided on the optical head 6 side. In this case, since the optical sensor 386 can be provided on the fixed portion side in the upper lid opening / closing type CD player as shown in FIG. 151, there is an effect that wiring is simplified.

As for the information of the optical mark 387, the reflected light may be read by the optical head 6 or the transmitted light may be read by the optical sensor 386. Also, by sharing the optical sensor 386 with a conventional optical sensor that detects the presence or absence of Cd,
This has the effect of reducing the number of parts. In addition, an optical mark can be created at the time of manufacturing the optical recording film by intermittently providing an optical recording layer by vapor deposition of aluminum or the like and forming it in a circumferential bar code shape. In this case, there is an effect that the manufacturing process of the optical mark becomes unnecessary.

Next, in the case of a portable CD player, as shown in FIG. 151, an upper lid 389 that opens and closes up and down is provided, and a method of attaching and detaching a CD is generally adopted. In the present invention, the magnetic head 8 is opened and closed when the upper lid 389 is opened and closed.
And the magnetic head traverse shaft 363b is the upper lid 38.
It is opened and closed in conjunction with 9. When the upper lid 389 is in the “open” state, the magnetic head 8 is separated from the recording medium 2 together with the upper lid 389 as shown in FIG. 151, so that the recording medium 2 can be easily attached and detached. When the upper cover 389 is “open”, the upper cover 389 is closed and the magnetic head 8 and the magnetic head traverse shaft 363b approach the vicinity of the recording medium 2. The head actuator 22 makes the magnetic head 8 contact the recording medium 2 only when magnetic recording / reproduction is necessary.

The optical head 6 is the traverse actuator 2
3 and traverse gear 367b and traverse shaft 36
Tracked by 3a. At this time, it is transmitted to the traverse gear 367c by the traverse gear 367a, and the magnetic head traverse shaft 367b moves in the direction indicated by the arrow 51
Move in the direction. In this way, the magnetic head 8 moves in the same direction by the same distance in conjunction with the optical head 6, so that when the upper lid 389 is closed, the optical head 6 and the magnetic head 8 are aligned as described above. In other words, the optical head 6 and the magnetic head 8 access a predetermined magnetic track on the back side of the preset optical track.

By thus moving the magnetic head 8 and the magnetic head traverse in conjunction with the upper lid 389, the present invention can be applied to a CD player of the upper lid opening / closing method, and therefore the entire player can be miniaturized. There is an effect that can be converted.

Next, a cartridge for accommodating the CDROM of the present invention will be described. First, FIG. 153 shows a perspective view of the optical disk cartridge of the present invention. Now, with reference to this drawing, a conventional cartridge for a CDROM will be described. A conventional cartridge for a CDROM has a cassette lid 397 which rotates in the direction of an arrow 51c around a rotation shaft 39 for taking out a recording medium 2 such as a CDROM, and at the same time, has a window on the optical recording surface side on the back side of the drawing. It has a shutter 301 for the recording surface.

In the case of the cartridge of the present invention, a magnetic surface shutter 391 is added to the cassette lid 390.
When the shutter 392 on the optical recording surface opens in the direction of arrow 51a,
When the window of the optical recording unit opens, the magnetic surface shutter 391 slides in the direction of the arrow 51a by the connecting unit 392, and the window on the magnetic recording surface side of the recording medium 2 opens. Thus, by using the disc cassette 42 of the present invention, a CD can be attached and detached, and at the same time, the windows on both sides of the magnetic recording surface and the optical recording surface are
Since it can be opened and closed, there is an effect that the optical recording / reproducing of the present invention and the magnetic recording / reproducing can be simultaneously performed. Further, there is an effect that it is completely compatible with the conventional single-sided window type CDROM cartridge for optical recording and reproduction.

As described above, by providing the magnetic recording layer 3 on the back side of the recording medium 2 having an optical recording surface, a magnetic field modulation type magneto-optical recording is performed in the RAM type recording / reproducing apparatus like magneto-optical recording. By sharing the magnetic field head between the magnetic field modulations of the recording / reproducing apparatus, the number of parts and the cost are hardly increased,
Magnetic recording of information of independent channels provided on the recording medium can be performed. In this case, since the slider tracking mechanism for the magnetic head is originally provided, there is almost no increase in cost on the recording / reproducing device side. Therefore, there is an effect that a magnetic recording / reproducing function independent of optical recording can be added at substantially the same price.

The recorded recording medium is used as a music CD.
When applied to a hard disk, a HD, a game CDROM or an MDROM, and provided with a magnetic recording track on the back surface by a ROM type recording / reproducing apparatus 1 shown in the block diagram of FIG. It is possible to obtain a remarkable effect such as returning to. Even when recording is limited to only one track in the TOC area as described in the first embodiment, when the gap width is 200 μm, several hundred bits are used.
You can record. This capacity meets the requirements required for the use of the current game IC-ROM with a flash memory. TO
If the track is limited to one track in the area C, the access means for the magnetic track is not required, and the system is simplified.

Further, in the read / write device of the read-only type for optical recording, it is necessary to provide a magnetic head portion or the like on the opposite side of the recording medium facing the optical head. Since it can be shared with the magnetic field modulation head, the price can be reduced due to the effect of mass production. Originally, the cost is much lower than the magnetic recording component for low density, which is much lower than that of the optical recording component. No tracking mechanism is added because the optical head and the magnetic head on the opposite side are mechanically linked. Therefore, the cost does not increase.

Although the tracking accuracy is not high by tracking the optical head by the address information or the time information engraved on the optical recording layer on the surface of the RAM type or ROM type recording medium, the tracking accuracy is not high. The magnetic head can be tracking-controlled at an arbitrary position. As a result, for consumer applications such as linear sensors and linear actuators found in floppy disks, it is possible to obtain the effect that no expensive parts need to be added.

The protective layer on the back surface of the conventional magnetic field modulation type magneto-optical recording medium is manufactured by spin coating from a binder and a lubricant. In the case of the present invention, a magnetic material is added to this material and spin coating is performed in this same step, and the number of manufacturing steps does not often increase. This increase in cost is of a negligible order from the overall cost perspective. Therefore, the new value of the magnetic recording function is added with almost no increase in cost.

As described above, according to the present invention, the magnetic channel can be added with almost no increase in cost.
A RAM function can be added to an M-type optical disk or a ROM-only player.

Further, the high Hc magnetic sheet of the present invention is attached to the label portion of the audio cassette or video cassette such as DCC or VHS, and the data recorded on the magnetic sheet is read by the magnetic head 8 at the time of cassette loading, and the data is recorded by the microcomputer. When the data is stored in the IC memory and the data on the magnetic sheet needs to be updated, only the contents of the IC memory are updated while the cassette is being inserted, and only the updated data of the data stored in the IC memory when the cassette is taken out is read. By rewriting the data on the magnetic recording layer of the magnetic sheet with a fixed magnetic head provided at the outlet of the cassette, index information such as the address and TOC of the cassette tape can be recorded in the cassette independently of the tape. The effect is that information retrieval can be done instantly.

[0245]

As described above, by providing the magnetic recording layer 3 on the back side of the recording medium 2 having an optical recording surface, a magnetic field modulation type light is used in a RAM type recording / reproducing apparatus like magneto-optical recording. By sharing the magnetic field head between the magnetic field modulations of the recording / reproducing apparatus for magnetic recording, it is possible to perform magnetic recording of information of independent channels provided on the recording medium with almost no increase in the number of parts and cost. In this case, since the slider tracking mechanism for the magnetic head is originally provided, there is almost no increase in cost on the recording / reproducing device side. Therefore, there is an effect that a magnetic recording / reproducing function independent of optical recording can be added at substantially the same price.

[0246] Further, this recording medium is used as a music CD.
When applied to a hard disk, a HD, a game CDROM or an MDROM, and provided with a magnetic recording track on the back surface by a ROM type recording / reproducing apparatus 1 shown in the block diagram of FIG. It is possible to obtain a remarkable effect such as returning to. Even when recording is limited to only one track in the TOC area as described in the first embodiment, when the gap width is 200 μm, several hundred bits are used.
You can record. This capacity meets the requirements required for the use of the current game IC-ROM with a flash memory. TO
In the case of limiting to C, the access means of the magnetic track is not required, and the system becomes simple.

In a read-only recording / reproducing apparatus for optical recording, it is necessary to provide a magnetic head portion or the like on the opposite side of the recording medium facing the optical head. Since it can be shared with the magnetic field modulation head, the price can be reduced due to the effect of mass production. Originally, the cost is much lower than the magnetic recording component for low density, which is much lower than that of the optical recording component. No tracking mechanism is added because the optical head and the magnetic head on the opposite side are mechanically linked. Therefore, the cost does not increase.

The tracking accuracy is not high by tracking the optical head according to the address information or the time information engraved on the optical recording layer on the surface of the RAM type or ROM type recording medium, but the tracking accuracy is not high. The magnetic head can be tracking-controlled at an arbitrary position. As a result, for consumer applications such as linear sensors and linear actuators found in floppy disks, it is possible to obtain the effect that no expensive parts need to be added.

The protective layer on the back surface of the conventional magnetic field modulation type magneto-optical recording medium is manufactured by spin coating from a binder and a lubricant. In the case of the present invention, a magnetic material is added to this material and spin coating is performed in this same step, and the number of manufacturing steps does not often increase. This increase in cost is of a negligible order from the overall cost perspective. Therefore, the new value of the magnetic recording function is added with almost no increase in cost.

As described above, according to the present invention, since the magnetic channel can be added with almost no increase in cost, the conventional RO
A RAM function can be added to an M-type optical disk or a ROM-only player.

The present invention provides a method for specifically realizing a consumer-use partial RAM disk for a ROM disk without a cartridge such as a CDROM and a ROM disk with a cartridge such as an MDROM. The configuration, action, and effect will be described below.

First, the method of the present invention will be described for the ROM disk without the cartridge, which is the first method. The conventional method in which a magnetic recording layer is simply provided on the back surface of a ROM disk without a cartridge cannot be used for consumer use as described above. This is because the usage environment is wide-ranging for consumer use. At home, it is affected by magnets, dirt, scratches, etc. Under worst conditions, if the magnetic recording layer is exposed like a floppy disk, the recorded information is easily destroyed. In order to secure reliability, Hc of the medium is increased to 1200 Oe or more in the present invention as a measure against the magnetic field of the magnet. A hard protective layer having a Mohs hardness of 5 or more is provided on the magnetic recording layer as a countermeasure against scratches such as nails. As a measure against dirt, a method of using a water-repellent material as a protective layer for the medium or providing a cleaning mechanism in the system is adopted.

When such a medium is used, it is necessary to adapt the system configuration and function to this special medium. Generally, a magnetic disk such as a floppy disk or a hard disk causes a space loss on the order of several hundred angstroms. On the other hand, in the present invention, since the protective film or the printing layer is located above the magnetic recording layer, the space loss becomes an order of magnitude of 1 μm or more as compared with the magnetic recording of a normal magnetic disk. In order to record this, the present invention first adopts a configuration in which the head gap of the magnetic head is expanded to 5 μm or more. As a result, there is an effect that the above-mentioned medium of the present invention having strong environment resistance can be reproduced. Also, in order to reduce the cost, C on the optical track
In the case of D, the address information called the subcode recorded in 75 times per second is used to access the optical head to the specific optical track, and the specific magnetic track is tracked by the magnetic head that moves in conjunction with the optical head. Is going. In this case, the magnetic head and the optical head can be moved by also using one actuator. This has the effect of significantly reducing the cost.

Since the magnetic noise jumping from the actuator section of the optical head to the magnetic head is 40 dB or more, the level of the mixed noise is lowered by shielding the optical head or separating the positions of the magnetic head and the optical head. . Further, since a liquid lubrication layer cannot be provided on the medium, the magnetic head is heavily worn. Therefore, the information of the magnetic recording layer is temporarily stored in the internal memory, the content of the internal memory is rewritten during information processing to reduce the number of times of recording / reproducing of the magnetic head, and the magnetic head and the magnetic head are not operated during the period other than recording / reproducing of magnetic information. The number of passes of the magnetic head is substantially reduced by separating from the disk surface. Therefore, there is an effect that the life of the medium and the head is significantly extended.
Also, in order to speed up the start-up when inserting the disc,
"Variable track pitch mode" is provided. This forms a magnetic track just behind the optical track in the order of the optical track accessed by the optical head at the time of rising. Then, when rising, these magnetic tracks are sequentially accessed by the optical tracks and the magnetic heads are automatically accessed. If the magnetic recording data required at the time of rising is recorded in these magnetic tracks, the information on the magnetic track required at the time of rising can be reproduced without accessing the magnetic tracks excessively. This has the effect of eliminating loss time and accelerating the start-up. In addition, when there is magnetic track information for each song, there is an effect that personal data for each song can be accessed faster, for example, when karaoke.
Further, unlike the ordinary floppy, it is not necessary to provide the head portion of the data of each track on a specific angle, and the synchronization area can be arranged at random, so that the rotation angle detection becomes unnecessary and the cost of the device is reduced.

In a disk with a cartridge such as an MDROM, a magnetic material having a low Hc, which is usually used in floppies, can be used for the magnetic recording layer, and the space loss due to the protective layer does not increase. But,
Since it is not originally considered to attach a liner to the cartridge, if a liner is provided, the torque of the drive motor used so far is weak and does not rotate normally due to friction torque generation. Therefore, in the present invention, the liner is temporarily brought into contact with the medium surface only during magnetic recording. This partial liner method has an effect of preventing the influence of dust. Further, the configuration in which the magneto-optical magnetic field modulation head is also used as the magnetic head has an effect of reducing the number of parts.

Due to the above-described constitution and effects, the present invention ensures the reliability of the medium having the magnetic recording portion on the back side of the optical recording surface and the recording / reproducing apparatus while satisfying the standard of CD and the like in the usage environment for consumer use. However, it can be realized at a cost for consumer use.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of an optical recording head unit according to the first embodiment.

FIG. 3 is an enlarged view of a head portion according to the first embodiment.

FIG. 4 is an enlarged view of a head portion in a tracking direction according to the first embodiment.

FIG. 5 is an enlarged view of a magnetic head unit according to the first embodiment.

FIG. 6 is a timing chart of magnetic recording in the first embodiment.

FIG. 7 is a cross-sectional view of the recording medium according to the first embodiment.

FIG. 8 is a cross-sectional view of the recording medium according to the first embodiment.

FIG. 9 is a cross-sectional view of the recording medium according to the first embodiment.

FIG. 10 is a sectional view of a recording unit in the first embodiment.

FIG. 11 is a sectional view of a recording unit in the first embodiment.

FIG. 12 is a sectional view of a recording unit in the first embodiment.

FIG. 13 is a sectional view of a recording unit in the first embodiment.

FIG. 14 is a sectional view of a recording unit in the first embodiment.

FIG. 15 is a perspective view of the cassette according to the first embodiment.

FIG. 16 is a perspective view of a recording / reproducing apparatus according to the first embodiment.

FIG. 17 is a block diagram of a recording / reproducing apparatus according to the first embodiment.

FIG. 18 is a perspective view of the game machine according to the first embodiment.

FIG. 19 is a block diagram of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 20 is an enlarged view of a magnetic head unit according to the second embodiment.

FIG. 21 is an enlarged view of a magnetic head unit according to the second embodiment.

FIG. 22 is an enlarged view of a magnetic head unit according to the second embodiment.

FIG. 23 is an enlarged view of a recording unit according to the third embodiment of the present invention.

FIG. 24 is a block diagram of a recording / reproducing apparatus according to a fourth embodiment of the present invention.

FIG. 25 is an enlarged view of the magnetic recording portion in the fourth embodiment.

FIG. 26 is an enlarged view of a magneto-optical recording unit in the same Example 4.

FIG. 27 is a cross-sectional view of the recording unit in the fourth embodiment.

FIG. 28 is a flowchart in the fourth embodiment.

FIG. 29 is a flowchart of the fourth embodiment.

FIG. 30 (a) is a sectional view when the magneto-optical disk of the fourth embodiment is mounted, and (b) is a sectional view of the fourth embodiment when a CD is mounted.

FIG. 31 is an enlarged view of the magneto-optical recording unit of the fourth embodiment.

FIG. 32 is a block diagram of a recording / reproducing apparatus in Embodiment 5 of the present invention.

FIG. 33 is an enlarged view of the magnetic recording unit in the fifth embodiment.

FIG. 34 is an enlarged view of the magneto-optical recording unit in the fifth embodiment.

FIG. 35 is an enlarged view of a magneto-optical recording unit in the fifth embodiment.

FIG. 36 is an enlarged view of a magnetic recording unit in the fifth embodiment.

FIG. 37 is an enlarged view of a magneto-optical recording unit in the fifth embodiment.

FIG. 38 is a block diagram of a recording / reproducing apparatus in Embodiment 6 of the present invention.

FIG. 39 is a block diagram of a magnetic recording unit in the sixth embodiment.

FIG. 40 is an enlarged view of the magnetic field modulator in the sixth embodiment.

FIG. 41 is a top view of the magnetic recording portion according to the sixth embodiment.

FIG. 42 is a top view of the magnetic recording portion according to the sixth embodiment.

FIG. 43 is an enlarged view of the magnetic recording unit in the sixth embodiment.

FIG. 44 is an enlarged view of the magnetic field modulator in the sixth embodiment.

FIG. 45 (a) is a top view of a disc cassette according to a seventh embodiment of the present invention, and (b) is a top view of a disc cassette according to the seventh embodiment.

46A is a top view of the disc cassette according to the seventh embodiment, and FIG. 46B is a top view of the disc cassette according to the seventh embodiment.

47A is a top view of the disc cassette according to the seventh embodiment, and FIG. 47B is a top view of the disc cassette according to the seventh embodiment.

48A is a top view of the disc cassette according to the seventh embodiment, and FIG. 48B is a top view of the disc cassette according to the seventh embodiment.

FIG. 49 (a) is a top view of a liner peripheral portion in the seventh embodiment. (B) is a top view of a liner peripheral portion in the seventh embodiment. (C) is a top view of a liner peripheral portion in the seventh embodiment.

50 (a) is a top view of a liner peripheral portion in the seventh embodiment (b) is a top view of a liner peripheral portion in the seventh embodiment (c) is a cross-sectional view of a liner portion in the seventh embodiment d) is a cross-sectional view of the disk cassette according to the seventh embodiment.

FIG. 51 is A when the liner pin is inserted off in Example 7 of the present invention.
-A 'cross-sectional view

52 is an A- when the liner pin is inserted on in Example 7; FIG.
Cross section of plane A '

53 (a) is a liner pin insertion of of the seventh embodiment.
A transverse cross-sectional view of the AA ′ surface at the time of f is (b), which is A- at the time of inserting the liner pin of the seventh embodiment.
Cross section of plane A '

FIG. 54 (a) is a magnetic head mount o of the seventh embodiment.
A transverse cross-sectional view of the AA ′ surface at the time of ff is shown in FIG.
Cross section of plane A '

FIG. 55 (a) is a magnetic head mount o of the seventh embodiment.
A transverse cross-sectional view of the AA ′ surface at the time of ff is shown in FIG.
Cross section of plane A '

FIG. 56 is a top view of the recording medium of Example 7.

FIG. 57 (a) is a liner pin insertion of of the seventh embodiment.
A transverse cross-sectional view of the AA ′ surface at the time of f is (b), which is A- at the time of inserting the liner pin of the seventh embodiment.
Cross section of plane A '

FIG. 58 is a sectional view of the front part of the liner pin of the seventh embodiment (o
ff)

FIG. 59 is a sectional view of the front portion of the liner pin according to the seventh embodiment (o)
n hours)

FIG. 60 is a transverse cross-sectional view (of) of the liner pin according to the seventh embodiment.
f time)

FIG. 61 is a cross-sectional view (on of the liner pin of Example 7).
Time)

FIG. 62 is a sectional view of the front portion of the seventh embodiment when the liner pin is off.

FIG. 63 is a cross-sectional view of the front portion of the seventh embodiment when the liner pin is on.

FIG. 64 is a sectional view of the front portion of the seventh embodiment when the liner pin is off.

FIG. 65 is a sectional view of the front portion of the seventh embodiment when the liner pin is on.

FIG. 66 is a sectional view of the front portion of the seventh embodiment with the liner pin off.

FIG. 67 is a cross-sectional view of the front portion of the seventh embodiment when the liner pin is off and not operating.

68A is a top view of the disc cassette according to the eighth embodiment of the present invention, and FIG. 68B is a top view of the disc cassette according to the eighth embodiment.

69 (a) is a liner pin insertion of of the eighth embodiment of FIG.
Transverse sectional view of peripheral portion at time f (b) is a transverse sectional view of peripheral portion at the time of inserting the liner pin of the eighth embodiment

FIG. 70 (a) is a top view of the disc cassette of the eighth embodiment. (B) is a top view of the disc cassette of the eighth embodiment. (C) is a top view of the disc cassette of the eighth embodiment.

FIG. 71 is a transverse sectional view of the disc cassette and the liner pin according to the eighth embodiment.

72 (a) is a horizontal cross-sectional view of the liner pin peripheral portion of the eighth embodiment, and (b) is a horizontal cross-sectional view of the liner pin peripheral portion when the conventional cassette of the eighth embodiment is mounted.

73 (a) is a liner pin insertion of of the eighth embodiment of FIG.
Transverse sectional view of peripheral portion at time f (b) is a transverse sectional view of peripheral portion at the time of inserting the liner pin of the eighth embodiment

FIG. 74 (a) is a liner pin insertion of of the eighth embodiment.
Transverse sectional view of peripheral portion at time f (b) is a transverse sectional view of peripheral portion at the time of inserting the liner pin of the eighth embodiment

FIG. 75 is a top view of the disc cassette according to the ninth embodiment of the present invention.

FIG. 76 is a lateral cross-sectional view of the peripheral portion of the ninth embodiment when the liner pin is inserted off.

77 is a lateral cross-sectional view of the peripheral portion of the ninth embodiment when the liner pin is inserted on. FIG.

FIG. 78 (a) is a liner pin insertion of of the ninth embodiment.
Transverse sectional view of peripheral portion at time f (b) is a transverse sectional view of peripheral portion at the time of inserting the liner pin of the ninth embodiment

FIG. 79 (a) is a tracking principle diagram without correction in Embodiment 10 of the present invention (b) is a tracking principle diagram without correction in Embodiment 10

80A is a tracking state diagram of the optical head of the tenth embodiment, and FIG. 80B is a tracking state diagram of the optical head of the tenth embodiment.

81 (a) is a diagram of the eccentricity of the optical track of the disk of the tenth embodiment, (b) is a diagram of eccentricity of the optical track of the tenth embodiment, and (c) is a tracking error of the tenth embodiment. Signal illustration

82A is a tracking state diagram of the optical head of the tenth embodiment without correction, and FIG. 82B is a tracking state diagram of the optical head of the tenth embodiment after correction;

FIG. 83 is a diagram of a reference track of the tenth embodiment.

FIG. 84 (a) is a side view of the slider when the tenth embodiment is ON, and (b) is a side view of the slider when the tenth embodiment is OFF.

FIG. 85 (a) is a side view of the slider section of the tenth embodiment when the magnetic recording is off. (B) is a side view of the slider section of the tenth embodiment when the magnetic recording is on.

FIG. 86 is a correspondence diagram of disk positions and addresses according to the tenth embodiment.

FIG. 87 is a block diagram during magnetic recording in Example 11 of the present invention.

88A is a cross-sectional view of the magnetic head of the eleventh embodiment, FIG. 88B is a bottom view of the magnetic head of the eleventh embodiment, and FIG. 88C is a bottom view of another magnetic head of the eleventh embodiment. Figure

FIG. 89 is a spiral recording format diagram of the eleventh embodiment.

FIG. 90 is a recording format diagram of the guard band according to the eleventh embodiment.

FIG. 91 is a data structure diagram of the eleventh embodiment.

92A is a recording timing chart of the eleventh embodiment, and FIG. 92B is a recording timing chart at the time of two-head simultaneous recording of the eleventh embodiment.

93 is a block diagram of the same example 11 at the time of reproduction. FIG.

FIG. 94 is a data layout diagram of the eleventh embodiment.

FIG. 95 is a flowchart of traverse control of the eleventh embodiment.

FIG. 96 is a cylindrical recording format diagram of the 11th embodiment.

FIG. 97 is a relationship diagram of the traverse gear rotation speed and radius of the eleventh embodiment.

FIG. 98 is an optical recording surface format diagram of the eleventh embodiment.

FIG. 99 is a recording format diagram in the case where the backward compatibility of the eleventh embodiment is provided.

FIG. 100 is a correspondence diagram of the optical recording surface and the magnetic recording surface of the eleventh embodiment.

101 is an overall perspective view of a recording medium in Example 12. FIG.

102 is an overall perspective view of the recording medium of the embodiment. FIG.

103 is a cross-sectional view in the film forming and printing process of the recording medium of the example. FIG.

104 is a cross-sectional view in the film forming and printing process of the recording medium of the example. FIG.

FIG. 105 is an overall perspective view of a coating process of the example.

FIG. 106 is a cross-sectional view of the recording medium in the coating transfer process of the example.

FIG. 107 is a manufacturing process diagram of the recording medium of the example.

FIG. 108 is a transverse cross-sectional view of the recording medium in the coating and transferring step of the recording medium of the example.

FIG. 109 is an overall perspective view of a step of applying the recording medium of the example.

110 is an overall block diagram of the recording / reproducing apparatus in Example 13. FIG.

111 is a lateral cross-sectional view of the magnetic head peripheral portion of the embodiment. FIG.

FIG. 112 is a diagram showing a head gap length and an attenuation amount (d) of the embodiment.
Relationship diagram with B)

FIG. 113 is a top view of the magnetic track of the example.

FIG. 114 is a cross-sectional view of the magnetic head peripheral portion of the embodiment.

FIG. 115 is a cross-sectional view of the same embodiment when a recording medium is inserted.

FIG. 116 is a diagram showing the relationship between the distance between the optical pickup and the magnetic head and the amount of relative noise in Examples 12 and 13.

117 is a cross-sectional view of the head traverse portion in Embodiment 13. FIG.

118 is a top view of the head traverse portion in Embodiment 13. FIG.

FIG. 119 is a cross-sectional view of another head traverse portion in the thirteenth embodiment.

FIG. 120 is a cross-sectional view of another head traverse portion in the thirteenth embodiment.

121 is a diagram showing the magnetic field strength of various domestic products in Example 12. FIG.

122 is a recording format diagram of the recording medium in Example 13. FIG.

123 is a recording format diagram of the normal mode on the recording medium in Example 13. FIG.

FIG. 124 is a recording format diagram of the variable track pitch mode on the recording medium in Example 13.

FIG. 125 is an explanatory diagram of compressing magnetic recording information using a reference table of optical recording information according to a thirteenth embodiment.

FIG. 126 is a cross-sectional view of the head traverse portion in the thirteenth embodiment.

FIG. 127 is a flowchart of recording / reproducing in Embodiment 13 (No. 1)

FIG. 128 is a flowchart (part 2) of recording / reproducing in the thirteenth embodiment.

FIG. 129 is a configuration diagram of a noise detection head according to a thirteenth embodiment.

FIG. 130 is a configuration diagram of a magnetic sensor in Example 13.

FIG. 131 is a configuration diagram of a recording / reproducing apparatus in a fourteenth embodiment of the present invention.

FIG. 132 is a block diagram of a recording / reproducing apparatus in the same Example 14.

FIG. 133 is a block diagram of a drive current stop type of the fourteenth embodiment.

FIG. 134 is a processing procedure diagram of the signal processing means of the fourteenth embodiment.

FIG. 135 is a processing procedure diagram of the signal processing means of the fourteenth embodiment.

FIG. 136 is a three-dimensional cross-sectional view of the recording medium of Example 14

FIG. 137 is a structural diagram of the noise shielding layer of Example 14.

138] FIG. 138 is a measurement diagram of noise shielding characteristics of Example 14. [FIG.

FIG. 139 is a noise shielding structure diagram of Embodiment 14.

FIG. 140 is a structural diagram of the recording / reproducing apparatus of the fourteenth embodiment.

FIG. 141 is a structural diagram of the recording / reproducing apparatus of the fourteenth embodiment.

FIG. 142 is a block diagram showing a fifteenth embodiment of the recording / reproducing apparatus of the present invention.

FIG. 143 is a partial cross-sectional view of HB showing a fifteenth embodiment of the recording medium of the present invention.

FIG. 144 is an external view of an HB showing a sixteenth embodiment of the recording medium of the present invention.

FIG. 145 is a block diagram showing a sixteenth embodiment of the recording / reproducing apparatus of the present invention.

FIG. 146 (a) External view of recording medium showing 17th embodiment of the present invention (b) External view of recording medium showing 17th embodiment of the present invention

FIG. 147 is a block diagram showing a seventeenth embodiment of the recording / reproducing apparatus of the present invention.

FIG. 148 is a sectional view showing the structure of a conventional CD.

FIG. 149 is a block diagram showing the configuration of a conventional CD-ROM device.

FIG. 150 is a main-part configuration diagram showing an operating state of a conventional magneto-optical disk and a magneto-optical disk device.

FIG. 151 is a transverse cross-sectional view showing the opened / closed state of the upper lid of the recording / reproducing apparatus of Embodiment 18 of the present invention.

FIG. 152 is a time chart of the optical recording / reproducing clock signal, the magnetic recording / reproducing signal clock signal, the magnetic reproducing signal, and the reproducing pulse first data string D1, the magnetic recording / reproducing signal of PWM, the reproducing pulse, and the second data string in Example 18; Relationship diagram

FIG. 153 is a perspective view of the optical recording medium cartridge of the eighteenth embodiment.

FIG. 154 is an overall block diagram of the recording / reproducing apparatus in the eighteenth embodiment.

FIG. 155 is a time relationship diagram of the rotational angular velocity ω of the recording medium of Example 18, the optical recording / reproducing clock signal, the magnetic recording / reproducing clock signal, the magnetic recording signal, and the recording wavelength λ of the magnetic recording signal.

[Explanation of symbols]

 1 recording / reproducing apparatus 2 recording medium 3 magnetic recording layer 4 optical recording layer 5 light transmitting layer 6 optical head 7 optical recording block 8 magnetic head 8a main magnetic pole 8b auxiliary magnetic pole 8c head cap 8e uniform magnetic field area 8m magnetic field modulation magnetic head 8s for canceling Magnetic head 9 Magnetic recording block 17 Motor 18 Optical head 19 Head stand 23 Head movement actuator 23a Traverse actuator 24a Traverse movement circuit 37 Optical recording circuit 37a Magnetic field modulation circuit 38a Clock reproduction circuit 40 Coil 40a Magnetic field modulation coil 40b Magnetic recording coil 40c Tap 40d Tap 40e Tap 41 Slider 42 Disc cassette 43 Printing base layer 44 Printing area 45 Printing 46 Pit 47 Substrate 48 Light reflection layer 49 Printing ink 50 Protective layer 51 Arrow 52 Optical recording signal 54 lens 57 light emitting part 60 adhesive layer 61 magnetic recording signal 65 optical track 66 focus 67 magnetic track 67a recording magnetic track 67b reproducing magnetic track 67s servo magnetic track 67f guard band 67g guard band 67x cleaning track 69 high μ magnetic layer 70 head Gap 70a Recording head gap 70b Reproducing head gap 81 Interference layer 84 Reflective film 85 Modulating magnetic field 85a Magnetic flux 85b Magnetic flux 150 Coupling portion 201 Discrimination step 202 Reproduction step 203 Reproduction transcription step 204 Reproduction-only step 205 Recording transcription step 206 Recording step 207 Transformation step 210 Degaussing area 210a Degaussing area 210b Degaussing area 301 Shutter 302 Head hole 303 Liner hole 304 Liner 305 Liner support 305a Movable part 305b Sub-liner support part 305c Liner elevating part 307 Groove 307a Liner drive groove 310 Liner pin 311 Liner pin guide 312 Pin drive lever 313 Recognition hole 314 Protection pin 315 Liner drive part 316 Pin shaft 317 Spring 318 Connecting part 319 Pin shutter 320 optical address 321a center 321b center 321c center 322 optical data string 323 address 324 data 325 guard band 326 track group 327 block 328 track data 328 sync signal 329 address 330 pacty 331 data 333 separation circuit 334 modulation circuit 335 disk circuit corner detector 333 Eccentricity correction amount memory 337 No signal part 338 Traverse control part 339 Optical address magnetic add Correspondence table 340 head amplifier 341 demodulator 342 error check unit 343 data separation unit 344 AND circuit 345 recording data 346 non-light address area 347 optical address area 348 magnetic TOC area 349 track locus 350 head reproducing unit 351 memory data 352 coating material pot 353 coating material transfer roll 354 intaglio drum 355 etching section 356 scriber 357 soft transfer roll 358 coating section 360 magnetic shield 361 resin section 362 random magnetic field generator 363 traverse shakut 363b magnetic head traverse shaku 364 position reference section 365 disk lock section 366 Traverse connection part 367 Traverse gear 367c Magnetic head traverse gear 368 Reference table 369 Synchronous part 370 Format 371 Track number part 372 Data part 373 CRC part 374 Gap part 375 Connection part guide part 376 Disk cleaning part 377 Magnetic head cleaning part 378 Noise canceller 380 Disk cleaning part connection part 381 Magnetic sensor 382 Optical reproduction clock signal 383 Magnetic clock signal 384 Magnetic recording signal 385 Discrimination window time 386 Optical sensor 387 Optical mark 388 Light transmitting part 389 Upper lid 390 Cassette pig 391 Magnetic surface shutter 392 Shutter connecting portion 393 Cassette pig rotating shaft 1001 Magnetic head 1002 Noise 1003 Focusing coil 1004 Tracking coil 1005 light Head 1006 Recording / reproducing means 1007 Focusing servo control means 1008 Tra Locking servo control means 1009 optical signal reproduction processing means 1010 signal processing means 1011 head amplifier 1012 switch circuit 1020 magnetic recording / reproduction signal 1021 write signal 1022 read signal 1023 drive stop command 1024 drive stop command 1025 focusing error signal 1026 tracking error signal 1027 power supply stop signal 1050 Printing layer 1051 Magnetic layer 1052 Noise shielding layer 1053 Reflective film 1054 Transparent plastic 1055 Pit 1060 Conductor layer 1061 Non-conducting layer 1101 Objective lens 1102 Tracking coil 1103 Focusing coil 1104 Suspension and lead wire 1105 Yoke 1106 Magnet 1107 109 Yoke 1108 Cover Noise shielding layer 1110 Optical pick unit 12 00 recording medium 1201 lead screw 1202 feed motor 1203 connecting arm 1204 guide rail 1205 supporting member 1206 connecting shaft 1207 magnetic head 1210 disk motor 1211 supporting member 1212 supporting member 1300 magnetic recording layer 1301 optical recording layer 1302 lead screw 1303 feeding motor 1400 magnetic region Signal processing means 1401 Optical area signal processing means 1402 Control stop means 1403 Control means 1404 Control stop command 2004 Reflective film 2011 Optical head 2012 Optical head feeding mechanism 2013 Optical head control drive circuit 2014 Optical system signal processing circuit 2031, 41, 62 Hybrid medium 2032 Magnetic head 2033 Support mechanism 2034 Magnetic head feeding mechanism 2035 Magnetic signal processing circuit 2036 Magnetic Head lifting mechanism 2037 Drive controller 2038 Magnetic layer 2042 Magnetic surface marks 2051, 71 Reflective optical sensor 2052 Surface signal identification circuit 2061 Medium identification information 2072 Medium identification circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (31) Priority claim number Japanese Patent Application No. 4-331300 (32) Priority Date Hei 4 (1992) December 11 (33) Country of priority claim Japan (JP) (72) Inventor Ryosuke Shimizu 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (43)

[Claims] 1. A disk type recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transferred by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus for performing magnetic recording or reproduction of the magnetic recording layer by a magnetic recording / reproducing circuit, the above-mentioned is provided when the recording signal of the optical recording layer is reproduced and recorded on or reproduced from the magnetic recording layer. A recording / reproducing apparatus characterized by performing modulation or demodulation based on a recording signal. 2. A disk-shaped recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transmitted by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. A recording / reproducing apparatus which uses a magnetic recording / reproducing circuit to perform magnetic recording or reproduction of the magnetic recording layer based on a reproduction signal of the optical recording layer, wherein a magnetic head having a head gap of 5 μm or more is used. . 3. The recording / reproducing apparatus according to claim 2, wherein a slider portion having a plane area parallel to the magnetic recording surface of the recording medium is provided on the magnetic recording surface side of the magnetic head portion. . 4. A disk-type recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transferred by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus for performing magnetic recording or reproduction on the magnetic recording layer by a magnetic recording / reproducing circuit, the optical head unit is moved to an optical track having specific address information recorded in the optical recording unit, Magnetic head moving means for moving the magnetic head portion in conjunction with each other causes the magnetic head portion to access a magnetic track substantially on the back side of the specific optical track,
Magnetic recording or reproduction is carried out.
The recording / reproducing apparatus described. 5. A disk-shaped recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transmitted by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus for performing magnetic recording or reproduction on the magnetic recording layer by a magnetic recording / reproducing circuit, a detecting unit for detecting noise mixed in a magnetic reproduction signal from the drive unit of the optical head is provided,
A negative signal of the noise signal is added to the magnetic reproduction signal by an addition ratio A.
A recording / reproducing apparatus characterized by adding in. 6. The recording / reproducing apparatus according to claim 5, wherein another magnetic head provided in the vicinity of the reproducing magnetic head is used as the noise detecting means. 7. An optical head reference part is provided in a part of the optical head moving part and a magnetic head reference part is provided in a part of the magnetic head moving part, and at least once at the time when a new recording medium is mounted. The optical head is fixed to the optical head reference portion and the magnetic head is fixed to the magnetic head reference portion at the same time once and aligned, and then the movement of the optical head portion and the magnetic head portion is started. The recording / reproducing apparatus according to claim 1. 8. The recording / reproducing apparatus according to claim 1, wherein the driving of the optical head is temporarily stopped when reproducing the magnetic recording signal. 9. The optical head unit and the magnetic head unit are mechanically coupled to each other, and the magnetic head unit and the optical head unit are interlocked and moved by the same driving means. Recording / playback device. 10. The recording / reproducing apparatus according to claim 9, wherein a flexible material such as a leaf spring is used for the connecting portion. 11. The optical head unit and the magnetic head perform recording or reproduction while keeping a distance of at least 10 cm or more between the center position of the magnetic head of the magnetic head unit and the center position of the optical pickup of the optical head unit. The recording / reproducing apparatus according to claim 1, wherein 12. The recording / reproducing apparatus according to claim 11, wherein recording or reproducing is performed while the optical head and the magnetic head move in opposite directions by the same distance. 13. The recording / reproducing according to claim 11, wherein the magnetic head portion accesses a magnetic track on a circumference substantially the same as a radius of a specific optical track accessed by the optical head portion. apparatus. 14. A disk-type recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transferred by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus for performing magnetic recording or reproduction of the magnetic recording layer based on a recording signal of the optical recording layer provided by a magnetic recording / reproducing circuit, at least a plurality of the magnetic tracks among the magnetic tracks have a track interval in the radial direction substantially equal to each other. Recording and reproducing apparatus characterized by using the above-mentioned magnetic tracks which are not evenly spaced 15. A disk-type recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transferred by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus which performs magnetic recording or reproduction of the magnetic recording layer based on the optical recording signal by a magnetic recording / reproducing circuit, an electromagnetic cutoff characteristic is provided outside the focus driving section of the optical head section at least in the reproducing frequency band of the magnetic head. A recording / reproducing apparatus characterized in that a magnetic shield section having the above is provided. 16. A disk-shaped recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transferred by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus in which magnetic recording or reproduction of the magnetic recording layer is performed by a magnetic recording / reproducing circuit, the operation of the focus drive unit of the optical head is continuously interrupted while the magnetic head is reproducing a signal of a magnetic track. A recording / reproducing apparatus characterized by: 17. A disk-type recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transmitted by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus for performing magnetic recording or reproduction of the magnetic recording layer based on a recording signal of the optical recording layer provided by a magnetic recording / reproducing circuit, data of a specific magnetic track of the recording medium after the recording medium is mounted. Is reproduced by the magnetic head, the reproduced information is once stored in the internal memory of the magnetic recording / reproducing circuit, and if it is necessary to reproduce or rewrite the information on the specific magnetic track described above, Rewriting of the internal memory by the magnetic head is necessary only when the information in the internal memory is reproduced or rewritten, and it is necessary to save the internal memory in the recording medium during or after the information processing work. A recording / reproducing apparatus characterized in that only information is recorded on a magnetic recording layer of a recording medium. 18. A disk-type recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transferred by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus for performing magnetic recording or reproduction of the magnetic recording layer based on a recording signal of the optical recording layer by a magnetic recording / reproducing circuit, a magnetic head elevating means is provided, and the magnetic head unit records the magnetic recording unit recording information. Before recording or reproducing, the magnetic head is brought into contact with the magnetic recording portion by the magnetic head elevating means, and after the recording or reproducing of the magnetic information, the magnetic head and the magnetic recording portion A recording / reproducing apparatus characterized by bringing the and the non-contact state. 19. A disk-shaped recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transferred by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and a signal of the optical recording layer is reproduced by an optical recording / reproducing circuit, and a magnetic head unit and a magnetic head moving unit are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus for performing magnetic recording or reproduction of the magnetic recording layer based on the recording signal of the optical recording layer based on the recording signal of the optical recording layer, a synchronizing signal of data of each magnetic track is included. A recording / reproducing apparatus, wherein a head portion is present on an unspecified angle area of an angle from the central portion of the storage medium. 20. Immediately after reproducing specific address information on an optical track, recording of a signal at the head portion including a sync signal of data for one track of a magnetic signal recording format is started on a magnetic track of a magnetic recording layer. 20. The recording / reproducing apparatus according to claim 19, wherein: 21. The recording / reproducing apparatus according to claim 1, further comprising a recording medium cleaning unit which is connected to the magnetic head by a connecting unit and is made of a flexible material. 22. When the error rate occurs a certain number of times or more, recording / reproduction is interrupted, the recording medium is ejected, and a cleaning instruction for the recording medium is displayed on a display unit provided on the outer surface of the apparatus. The recording / reproducing apparatus according to claim 1. 23. A center portion of a magnetic track is set on the back side of the innermost optical track in each of the optical track groups in which information necessary for program activation is recorded, and recording / reproducing is performed. The recording / reproducing apparatus according to claim 14. 24. A disk-shaped recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transferred by an optical head unit and an optical head moving unit. An image is formed on the optical recording layer from the transparent substrate side, and the signal of the optical recording layer is reproduced by an optical recording / reproducing circuit on the basis of the recorded signal of the optical recording layer and is opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus in which a magnetic head portion and a magnetic head moving portion are provided on the side to perform magnetic recording or reproduction on the magnetic recording layer by a magnetic recording / reproducing circuit, the rotating portion controls rotation at a constant linear velocity and records concentrically. A recording / reproducing apparatus characterized in that the data amount of the recording format of each track that is recorded is increased as the radius increases. 25. A recording medium has an optical head section including a pickup for magneto-optical recording and reproduction on the front surface side, an optical head driving section and an optical head moving section, and a magnetic field modulation for magneto-optical recording on the back surface side. In a magneto-optical recording type recording / reproducing apparatus having a head, the magnetic recording medium having a magnetic recording layer provided on the back surface of the recording medium is used, and the magnetic recording medium is provided integrally with the magnetic field modulation head in contact with the recording medium. A recording / reproducing apparatus for recording / reproducing information on / from the magnetic recording layer by the magnetic head. 26. A disc-shaped recording in which a pit is provided on one side of a light transmitting layer, a reflecting portion made of a metal such as aluminum is provided near the pit portion, and a magnetic recording layer is provided near the reflecting portion. In the medium, the magnetic recording layer has a coercive force of 15
A recording medium characterized by using a magnetic material of 00 oersted or more. 27. The recording medium according to claim 26, wherein the magnetization direction of the magnetic material is randomly oriented. 28. The recording medium according to claim 26, wherein barium ferrite is used as the magnetic material. 29. The recording medium according to claim 26, wherein a protective layer having a thickness of at least 1 μm or more is provided on the outer surface side of the recording medium of the magnetic recording layer. 30. The recording medium according to claim 26, wherein a print underlayer made of a light blocking material is provided on the magnetic recording layer. 31. The recording disk according to claim 30, wherein a printed layer is provided on the printing underlayer. 32. A cartridge containing a recording medium having an optical recording layer on one side and a magnetic recording layer on the same side and having a liner made of a flexible material inside, and a shutter provided for the inside of a cartridge having a shutter window for an optical head. A recording medium cartridge, characterized in that the liner has a structure which is applied to the magnetic recording layer by pressure from the outside through a hole provided in the portion. 33. The magnetic head is positioned by a motor that performs a step operation.
The recording / reproducing apparatus described. 34. A recording medium comprising an optical recording layer and a magnetic recording layer, and a noise shielding layer provided between the optical recording layer and the magnetic recording layer. 35. The recording medium according to claim 34, wherein the noise shielding layer includes a conductor. 36. The recording medium according to claim 34, wherein the noise shielding layer has a laminated structure having a plurality of combinations of conductors and non-conductors. 37. The recording medium according to claim 34, wherein the noise shielding layer has a function of a light reflecting film in the optical recording layer. 38. The cover for protecting the optical pick portion includes a noise shielding member.
5. The recording / reproducing apparatus according to item 5. 39. The recording / reproducing apparatus according to claim 15, wherein the magnetic head includes a noise shielding member. 40. A recording / reproducing apparatus using a rotary recording medium having a magnetic recording area and an optical recording area, and a magnetic head for recording / reproducing a signal to / from the magnetic recording area,
An optical head capable of reproducing at least a signal from the optical recording area, wherein the magnetic head and the optical head are arranged at a position of 180 degrees with respect to a rotation center of the rotary recording medium. Playback device. 41. A head moving means for moving the magnetic head and the optical head at the same time is provided.
0 recording / reproducing apparatus. 42. An optical recording medium is provided with an opening window on a light reading side, a shutter portion covering the opening window, and an opening / closing portion on a side opposite to the optical reading side, the opening portion being movable more than the optical recording medium. A cartridge housed inside, wherein a sub-shutter part covering the sub-opening and the sub-opening window is provided in the opening / closing part. 43. A disk-shaped recording medium having a transparent substrate and an optical recording layer and a magnetic recording layer formed on one side of the transparent substrate is mounted, and light from a light source is transmitted by an optical head unit and an optical head moving unit. The optical recording layer is replenished from the transparent substrate side to reproduce the signal of the optical recording layer by an optical recording / reproducing circuit, and a magnetic head part and a magnetic head moving part are provided on the side opposite to the optical reading side of the recording medium. In a recording / reproducing apparatus in which magnetic recording or reproduction of the magnetic recording layer is performed by a magnetic recording / reproducing circuit, PWM is applied to the magnetic recording / reproducing signal by using the clock signal obtained from the optical recording / reproducing signal as a reference signal.
A recording / reproducing apparatus characterized by performing time pulse width modulation / demodulation including