JPH05307788A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To simply add a magnetic recording channel independent of an optical recording channel by providing a magnetic recording layer on the opposite side of the beam read side of an optical recording medium and providing a magnetic head on the side opposing to an optical head. CONSTITUTION:The magnetic recording layer 3 is provided on the upper layer of the optical recording layer 4 of the optical recording medium 2 and the magnetic head 8 is provided on the side opposing to the optical head 6. At a magneto-optical reproducing time, a beam is converged on the optical recording layer 4 by the optical head 6 and an optical recording block 7 and reproducing is performed. At an optical recording time, the beam is converged on the specified part of the optical recording layer 4 and raises the temperature of the part to Curie temperature or above. At the condition, by the magnetic head 8 and a magnetic block 9, the impressing magnetic field of the part is modulated and magneto-optical recording is performed. At a magnetic recording time, by using the magnetic head 8 and the magnetic recording block 9, a magnetic signal is recorded on the magnetic recording layer 3. By a system control part 10, operation information and output information from each circuit are obtained and a drive block 11 is driven and a motor 21 and the optical head 6 are controlled.

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, a recording / reproducing apparatus using an optical recording medium has made remarkable progress. At present, major applications of optical recording are mainly acoustic applications such as CDs and multimedia applications such as game CD-ROMs, and ROM applications account for a large number of applications, but recording-type ROM applications are also gradually increasing.

Recently, as a ROM application, an optical recording / reproducing apparatus using a small recording optical disk of magnetic field modulation type magneto-optical recording, which is abbreviated as MO, has been studied. This is a method in which a magneto-optical recording material is heated to a Curie temperature or higher by an optical head and the magnetization is reversed by a magnetic head for magnetic field modulation. What is called "MD" for music has been proposed. Although the main purpose of this device is to replace the music CD, it is expected that multimedia applications such as games will be introduced in the future. In the case of such multimedia applications, dialogue is important, and as is clear in CAI, games, etc., it is important to record the dialogue with the operator so far. That is, a certain amount of RAM memory is required.

On the other hand, in the case of multimedia use, the capacity becomes large and a capacity of 100 MB or more is required.
Since the cost is important for game applications, CDROMs and MDROMs satisfy this requirement, and will be the mainstream for the time being. As another method, a method of forming an MO film on a substrate provided with recording pits and a method of recording software on an MO type optical disk have been proposed, but since it is more expensive than a non-recorded MO optical disk, it is not possible to use multimedia. It was not suitable as a mass media for software supply in terms of cost. In addition, since the CD-ROM player and the MD-ROM player for reproduction only do not have an optical recording function, it is necessary to add a RAM medium such as a floppy disk when using the recording type optical disk for multimedia interactive type. there were.

[0005]

However, the above-mentioned conventional configuration has a fatal problem that the conversation cannot be recorded in the multimedia application because the ROM medium does not have the RAM function. Further, even if a RAM disk such as an MO disk is used, there is a problem that the optical recording / reproducing apparatus cannot record the progress of multimedia conversation.

The present invention solves the above conventional problems. In multimedia applications, focusing on the fact that the required ROM capacity is much smaller than the enormous ROM capacity, a magnetic recording layer is provided on the side opposite to the substrate of the optical recording layer of the recording medium. An object of the present invention is to provide a recording / reproducing apparatus which is provided and can perform magnetic recording / reproducing independent of optical recording.

[0007]

In order to achieve this object, a recording / reproducing apparatus of the present invention uses a recording medium having a transparent substrate and an optical recording layer to emit light from a light source by an optical head, and the optical recording layer from the transparent substrate side. In a recording / reproducing apparatus for recording or reproducing a signal by forming an image on the recording medium, a magnetic recording layer is provided on the side opposite to the optical reading side of the recording medium, and the magnetic recording layer is provided on the side opposite to the optical head with respect to the recording medium. It has a structure provided with a head.

[0008]

With this configuration, the magnetic disk tracks the magnetic track of the disk in association with the tracking of the optical head on the magnetic recording layer provided on the surface opposite to the reading side of the optical recording medium, and magnetic recording or reproduction is possible. Therefore, magnetic recording and reproduction of information can be performed completely independently of the optical recording function without increasing the number of parts.

[0009]

【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, and the recording signal recorded magneto-optically is reproduced. 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 its temperature is raised to the Curie temperature or higher. In this state, the magnetic head 8
Magneto-optical recording is performed by modulating the applied magnetic field in this portion by the magnetic recording block 9.

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 the 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, the magnetization 52 shown by the arrow in the optical recording layer 4 is generated as the recording medium 2 travels in the direction of the arrow 51 as shown in the enlarged view of the optical recording head portion of FIG. 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 No. 2 or during the time period when magnetic recording is not performed. As described above, the system controller 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 the optical recording signal as shown in FIG. Therefore, the deflection angle of the reflected light on 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 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 audio 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 entered into 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. Explaining with an enlarged view of the head portion of FIG. 3, the magnetic recording signal sent to the magnetic head 8 becomes a magnetic field by the coil 40, magnetizes the magnetic substance of the magnetic recording layer 3, and magnetic recording in the vertical direction as a magnetic signal 61. 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, as shown in the sectional view of the recording medium of FIG. 7, the thickness of the interference layer 81 is provided between the magnetic recording layer 3 and the optical recording layer 4. Since the protective layers 82 and 82a for preventing the deterioration are provided on both sides of the optical recording layer 4, the sum of the thickness of the interference layer 81 and the protective layer 82 becomes 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 prepared 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 in 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. The mixed material is applied to the substrate while applying a vertical magnetic field to form a magnetic recording layer 3 having a perpendicular magnetic recording film, thereby providing 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 as described later can be obtained. The cost increase in this case is only to add a magnetic material to the material for forming the protective film by spin coating which is currently performed in CD. For this reason, the manufacturing cost increases only by the cost of the magnetic material itself. Since this cost is several tenths of the manufacturing cost of the media, 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 an enlarged view of the head portion only in the tracking direction in FIG. 4, the optical head 6 has a focal point 66 near 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. In other words, 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 runs 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 required.

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 and the position of the magnetic track to be accessed from the upper surface in the radial direction are different, it is not possible to access both of them at the same time. In the case of data, the access is delayed only and not 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 the next optical track is reproduced again during the returning period Tb from t5 to t6. By accessing and returning to the optical track, 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
The information is reproduced. At this time, the magnetic head 8 runs 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.

For 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 on 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 order of preset songs. 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, joining for accessing tracks other than the TOC area will be described. FIG. 11 shows a state in which 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 with reference to the timing chart of FIG. 6, it is necessary to complete head movement, recording, and return 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, this information is read, and 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 for magnetic recording, during Tb, the rotational speed is decreased and the magnetic head 8 is raised, and after the magnetic head 8 is raised, the rotational speed is increased again to return to the original optical track 65a as shown in FIG. During this period, optical recording and reproduction will be 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 the TOC area is instructed not to require magnetic recording. As a result, even when 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 in comparison with 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 less than floppy,
Since information can be recorded and reproduced on the ROM type recording medium at such a low cost, various effects as described above can be obtained in the case of a game machine or a CD player which 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. The current game ROMIC is equipped with 2 KB or 8 KB of SRAM, so 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 having a short wavelength and on the deep layer portion 3b an independent channel having 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 a 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 it can be reproduced, the cost is reduced if this configuration is adopted 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 figure is a magnetic field modulation head, that is, the case where recording is performed by the magnetic head 8 suitable for a long wavelength.
When 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, if 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 is "101".
10110 ", which is the same area 1 as the upper area 120a.
8 bits can be recorded in 20d. When the signal in 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 area 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.
Signal 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 section 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 is the same as the magnetic recording film 3, 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 coupled to the slider 41 made of a light transmissive material by a coupling 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 this 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 vertically controlled by the focus control, they follow the surface accuracy of the substrate 5 of the recording medium 2 even if the surface accuracy is poor. For this reason, since a substrate having a poor surface accuracy can be used, there is an effect that a plastic substrate or a non-polished glass substrate, which is much cheaper than a polished glass substrate, can be used.

Further, FIG. 23 shows a 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. Further, 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 is used as 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 the configuration is not changed at all, 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 this 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 according to 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. The magnetic head 8 can be regarded as a ring head having a gap length L during horizontal recording. In addition, the structure is such that a uniform magnetic field is applied to the optical recording layer 4 when performing magnetic field modulation type magneto-optical recording. 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 sequentially recorded on the magnetic recording layer 3 according to 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 focus 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. Thus, even if the relative positional relationship between the optical head 6 and the magnetic head 8 is deviated so that 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 portion 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 86 a due to the magnetic recording signal 61 and the magnetic head 8 are applied to the magneto-optical recording material of the focus 66 portion of the optical recording layer 4 which has reached the Curie temperature or higher due to the focus 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 does 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 magneto-optical recording and magnetic recording are performed 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 the fourth embodiment, 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 the magneto-optical recording medium is mounted and recording is performed, 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 magneto-optical media, optical recording prohibition, magnetic recording prohibition, etc. is discriminated by a claw or the like engraved in the cassette of the disk of 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 indicates that there is magnetic data that has not been transcribed 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 in 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, data can be stored for several seconds so that 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, 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. At step 232, it is checked whether or not 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, the recording command is checked, 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
At No, when the sub recording signal is transferred to the optical recording layer, 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 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 transcribed to the optical recording layer. In step 253, check whether all postings have been completed,
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 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 rewriting all the sub recording signals accumulated in the memory to the magnetic recording layer.

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 to the optical recording surface before the magneto-optical recording. On the other hand, FIG.
In the case of the flow chart, 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. Since only the recording step 205 is different, it will be described in detail below.

Step 226 in the reproduction step 202
Check if there is a playback command and if No, go to 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 which is 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 or 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, the 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 completed, 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 a simple process.

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 magneto-optical disk and the CD are reproduced using the same mechanism. 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. The coercive force of the magnetic recording layer 3 of the CD is, for example, 1000 to 3
000 Oe, which is much higher than that of 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 approaches the magnitude of the magneto-optical recording layer, which has an effect. 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 modulating 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 may occur. For this reason, it is difficult to design the head and also difficult in terms of processing.

In other words, the wiring circuit is simple because the structure is simple, but 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 magnetic recording in 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 magnetic flux 86c, 8
The closed magnetic paths 6a and 86b are 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 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 also 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 path 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 magnetic pole 5a and that of the auxiliary magnetic pole 8b are in the same direction, so
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. Since the coercive force of the magnetic recording layer 3 is 800 to 1500 Oe, which is sufficiently higher than the modulating magnetic field and has an easy axis of magnetization in the horizontal direction, there is an effect that the magnetic recording signal 61 is not destroyed by the modulating magnetic field. Therefore, in Example 4, the coercive force Hc of the magnetic recording layer 3 is set higher than the recording magnetic field Hmax of the magneto-optical recording material, so that data is not destroyed. 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. 36,
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 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, the magnetic head 8 is provided with two gaps 8c and 8e as shown in FIG. Further, the 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 specific 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, magnetic recording is performed, but before that, the second auxiliary pole 8d
Thus, a degaussing current is supplied 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 of 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 track of the magnetic head 8 is displaced. 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 of FIG. 41, and magnetic recording is first performed by the gap 8c having a width wider than the recording track 67, and the guard bands 67f and 67g are partially overlapped. And record. This 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 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 of FIG. 44, currents in the directions of the arrows 51a and 51b are applied to the taps 40d and 40e, and the arrows 51c are applied to the tap 40f. 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. As described above, 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 cassette half has a groove 307 for a liner. The liner movable part 3 is placed in the groove 307.
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 the flat state by itself 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. Therefore, the wear of the recording layer 3 is normally prevented.

Next, if 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 305 and the liner 304 are pressed against the medium surface unless the liner pin presses the liner. 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 between contact and non-contact between the liner and the disc by 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. For this reason 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 at the time of rotation of the recording medium 2 is small, it rotates even with a weak driving force. Next, as shown in FIG. 52, when the liner pin 310 is pushed down by an external force in the direction of arrow 51, the main liner 304 is pushed against the magnetic recording layer 3 of the recording medium 2 via the liner support portion 305. 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 the magnetic recording / reproducing or the magnetic field modulation of the 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. 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 in FIGS. 60 and 61, and the front cross-sectional views of the liner pin portion in FIGS. 62 and 63 are full cross-sectional views of the liner pin portion of the leaf spring when 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 elevating 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, 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.

68A and 68B, there is no liner hole on the upper surface of the disk cassette as shown in the perspective view of the upper surface. 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.
FIGS. 69 (a) and 69 (b) are line A of FIG.
A sectional view of the A ′ plane is shown. First, as shown in FIG. 69A, when the liner pin 310 is in the OFF state, 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, the liner 304 and the recording medium 2 come into contact with each other, and dust is removed with the rotation.

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, it is different in that a movable portion 305a is provided at the tip of the driving portion of the liner driving portion 316 and that a liner driving groove 30a for accommodating the liner driving portion 316 is added as shown in FIG. 70 (c). ..

Here, 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.
As shown in the sectional view of the peripheral portion of the liner pin in FIG. 72 (a), if the disc cassette 42 of the present invention is inserted in the direction of the arrow 51, the liner 304 is interlocked without providing a liner pin actuator. Up and down. However, as shown in FIG. 72 (b), the conventional disc cassette 42
When there is no liner hole 303, the liner pin 310 is automatically lowered by the spring 317 as it is inserted, and there is an effect that the conventional disc 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 disc access is low, the liner pin does not need to be provided with an actuator, and thus the structure is simplified. FIG. 73
As shown in the magnetic head lifting / lowering section of FIGS. 9A and 9B, the liner pin 310 can be interlocked by the lifting / lowering section 20 and the connecting section 318 using one lifting / lowering motor 21. 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. Fig. 74
The sectional views of the disc cassettes of (a) and (b) are basically the same as those of FIG. 69, but since the liner driving unit 316 is extended and the pin shutter unit 319 is added, 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 occupied 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 'section in 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 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, there is an effect that the strength of the cassette is not impaired.

Further, B- in the top view of the cassette in 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. 78A, when the liner pin 310 is off, the liner hole is closed by the pin shutter 319. As shown in FIG. 78B, 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 mounting 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, thus preventing the recording medium from being destroyed. is there.

As described above, by providing the magnetic recording layer 3 on the back side of the recording medium 2 having the optical recording surface, the magnetic field modulation type magneto-optical recording is performed in the RAM type recording / reproducing apparatus like the 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.

Also, the recorded recording medium is used as a music CD.
When applied to a DVD, a HD, a game CDROM or an MDROM, and provided with a magnetic recording track on the back surface by the 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, several hundreds of bits are set when the gap width is 200 μm.
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 that of the magnetic recording component for low density, which is a magnetic recording component, so that the price increase is small. Since the optical head and the magnetic head on the opposite side are mechanically linked, no tracking mechanism is added. Therefore, the cost does not increase.

The tracking accuracy is not high by tracking the optical head by the address information or the time information engraved in the optical recording layer on the surface of the RAM type or ROM type recording medium, but the tracking accuracy is not high on the disc. 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-coated in this same step, and the number of manufacturing steps does not increase. This increase in cost is negligible 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.

Although the embodiment using the magnetic field modulation type magneto-optical recording is shown, it goes without saying that it can be applied to ordinary magneto-optical recording, other optical recording methods and optical ROM disks.

[0087]

As described above, according to the present invention, a recording medium having a transparent substrate and an optical recording layer is used, and light from a light source is imaged on the optical recording layer from the transparent substrate side by an optical head to record signals. In a recording / reproducing device for reproducing, an optical recording channel is provided by providing a magnetic recording layer on the side opposite to the optical reading side of the recording medium, and providing a magnetic head on the side facing the optical head on the recording / reproducing device side. Can realize an excellent recording / reproducing apparatus having the effect that independent magnetic recording channels can be added with almost no increase in cost or the number of parts.

[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 unit 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 according to 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 of 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 when a CD of the fourth embodiment is mounted.

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

FIG. 32 is a block diagram of a recording / reproducing apparatus according to a fifth embodiment 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 the magneto-optical recording unit in the fifth embodiment.

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

FIG. 37 is an enlarged view of the 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 section in 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.

45A is a top view of a disc cassette according to the seventh embodiment of the present invention, and FIG. 45B is a top view of the 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 part in the seventh embodiment, (b) is a top view of a liner peripheral part in the same example 7, and (c) is a top view of a liner peripheral part in the same example 7.

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] A when liner pin insertion is off in Example 7
-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) A- when the liner pin of the seventh embodiment is inserted
Cross section of plane A '

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

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

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

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) A- when the liner pin of the seventh embodiment is inserted
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 with the liner pin off.

FIG. 63 is a 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 cross-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.

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

FIG. 68 (a) is a top view of a disc cassette according to the eighth embodiment of the present invention. (B) is a top view of the disc cassette according to the eighth embodiment.

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

70A is a top view of the disc cassette according to the eighth embodiment, FIG. 70B is a top view of the disc cassette according to the eighth embodiment, and FIG. 70C is a top view of the disc cassette according to the eighth embodiment.

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

72A is a horizontal cross-sectional view of the liner pin peripheral portion of the eighth embodiment, and FIG. 72B is a horizontal cross-sectional view of the liner pin peripheral portion when the conventional cassette of the eighth embodiment is mounted.

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

[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 9 magnetic recording block 17 motor 19 head Platform 37 Optical recording circuit 37a Magnetic field modulation circuit 40 Coil 40a Magnetic field modulation coil 40b Magnetic recording coil 40c Tap 40d Tap 40e Tap 41 Slider 42 Disk cassette 51 Arrow 52 Optical recording signal 54 Lens 57 Light emitting part 65 Optical track 61 Magnetic recording signal 66 focus 67 magnetic track 67f guard band 67g guard band 67x cleaning track 81 interference layer 84 reflective film 85 modulation magnetic field 85a magnetic flux 85b magnetic flux 150 connection part 201 discrimination step 202 reproduction step 203 reproduction transcription step 2 4 Reproduction Only Step 205 Recording Transfer Step 206 Recording Step 207 Transfer 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 Section 305b Subliner Support 305c Liner Lifting Section 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 Connection part 319 Pin shutter

Claims (8)

[Claims] 1. A recording medium having a transparent substrate and an optical recording layer is mounted, and light from a light source is focused on the optical recording layer from the transparent substrate side by an optical head to record or reproduce a signal from an input section. In the recording / reproducing apparatus, the magnetic recording layer is provided on the side opposite to the light reading side of the recording medium, and the magnetic head is provided on the side opposite to the optical head with respect to the recording medium. A recording / reproducing apparatus characterized by performing reproduction. 2. An optical recording medium in which an optical recording layer is provided on a transparent substrate, wherein a magnetic recording layer is provided on the optical recording layer. 3. A recording / reproducing apparatus according to claim 1, wherein a magnetic field modulation type magneto-optical recording medium is used as the recording medium, and the magnetic head and the magnetic field modulating magnetic head are shared. 4. The recording / reproducing apparatus according to claim 3, wherein a ring type head having a head cap on the recording medium side is used as the magnetic field modulating magnetic head. 5. The optical recording medium according to claim 2, wherein a magneto-optical recording film is used as the optical recording layer, and the magnetic recording layer is used as a magnetic film having perpendicular anisotropy. 6. At least 0.5 between the optical recording layer and the magnetic layer.
3. The optical recording medium according to claim 2, further comprising an interference layer having a thickness of .mu.m or more and having a material composition different from that of the magnetic layer and the optical recording layer. 7. The optical recording medium according to claim 6, wherein the magnetic recording layer comprises a magnetic material having a high coercive force, a binder and a lubricant. 8. A ring type magnetic head comprising a main magnetic pole portion, a sub magnetic pole portion, a head cap provided between the main magnetic pole portion and the sub magnetic pole portion, and a coil, facing the recording medium of the main magnetic pole. At least 5 in the vertical direction with respect to the head cap in the portion other than the vicinity of the head cap.
A magnetic head for generating a perpendicular magnetic field having a substantially uniform magnetic field distribution with respect to the recording medium in a range of 0 μm or more.