JPS62256229A - Information recording medium disk - Google Patents

Abstract

PURPOSE:To form recorded traces of prescribed intervals, by providing an area, in which recorded trace patterns of prescribed intervals and address signals whose lengths are short are formed, and another area, in which signals indicating reference rotating phase are recorded, at the inside of a recording area. CONSTITUTION:The disk D of this invention is constituted of a recording area RD which contains recorded traces of information signals by the 1st optical spot and signals recorded in lands between each recorded trace by the 2nd optical spot, 1st recorded are PGD at the inside of the recording area PGD. The area PGD has a width which is lager than the eccentricity of the disk D and fluctuation of the home position of the optical spot and a recorded trace pattern held at prescribed intervals TP and prescribed address signals Sa having lengths, at which the optical spot can pass through in a time shorter than the period corresponding to the frequency of the gain intersecting point of a tracking servo system, are previously recorded in the 1st recorded area PGD. Moreover, signals SP which indicate the reference rotating phases of the disk D are previously recorded in the 2nd recorded area SPD.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an information recording medium disc.

(Prior Art) As the demand for recording various information signals at high recording densities has increased, in recent years, information recording media created based on various configuration principles and operating principles have been used to record information signals at high recording densities. It is well known that high-density recording and reproducing of Recording and reproducing devices that reproduce information signals by optical means or by detecting changes in capacitance values are already in practical use for recording and reproducing video and audio signals. In addition, in order to meet the demands for high-density recording and reproduction in various technical fields, by irradiating the recording layer of the information recording medium with a beam whose intensity is modulated by the information signal, the recording layer of the information recording medium can respond to the information signal. Research has also begun on information recording media that record information signals by causing physical or chemical changes, but in recent years it has become easier to obtain semiconductor lasers that operate stably. It is well known that various types of optical discs that use laser light for high-density recording and playback have already been put into practical use, or that research and development is currently underway to put them into practical use. It is as follows.

In other words, recorded optical discs (playback-only optical discs) that have been copied in large numbers from master discs on which information signals are recorded using pits formed as geometrical concave or convex parts are 1, for example, video discs, compact discs, etc. In addition, optical disks that can be added once by the user (write-once optical disks) and optical disks that can be erased are being put into practical use for office file memory and other uses. Active research and development is being carried out for this purpose, and up until now, even write-once optical discs and erasable optical discs have had their recording layers exposed to various physical phenomena due to the heating action of the laser beam spot. When classified based on whether the information signal is recorded by a change in the pit formation type, bubble or unevenness formation type, magneto-optical type, and phase change type (light transmittance, reflectance, absorption due to thermal energy) Three sets of product types have been proposed, which can be roughly divided into three types, such as a thermal transformation type that causes changes in the ratio, etc., as well as an information recording type in which recording and reproducing operations are performed using energy other than light. Many proposals regarding media have been made, but among the various types of information recording media mentioned above, information recording media belonging to the phase change type are attracting attention because of the possibility of erasing previously recorded information. Up to now, phase-change information recording media have used chalcogenide-based materials (germanium, tellurium, antimony, silicon, arsenic, bismuth, indium,
compositions consisting of various combinations of gallium, thallium, selenium, and sulfur) and lower oxides (e.g., Te and TeO
Research is progressing on various products such as those using mixtures of (2) and alloys.

In the various types of information recording media described above, when the recording layer is irradiated with intensity-modulated light or other recording beam, the light reflectance of the recording layer in the portion irradiated by the recording beam is However, most of them are equipped with a recording layer having a property that the resistance to light is higher than that of the portion not irradiated with the recording beam.

By the way, when reproducing information signals from an information recording medium on which information signals are recorded at high density, tracking control is used to ensure that the reproducing element or the reproducing beam always accurately follows the recording trace where the information signals are recorded. For example, a spot of light with a minute diameter is projected onto the signal surface of an information recording medium,
As a tracking error detection method used for tracking control in an optical information signal reproducing device that reproduces information signals based on reflected light whose intensity is modulated by pits formed on the signal surface, The so-called push-pull tracking error detection method uses the fact that the intensity distribution of the reflected light is biased by the tracking error to detect the tracking error, but the optical system has a simple configuration. In addition, it is widely used because it is cost-effective, and it also projects a first light spot for signal reading onto the signal surface of an information recording medium and includes the first light spot described above. Second and third optical spots for tracking are projected on a straight line at symmetrical positions with the first optical spot as the center of symmetry, and the second and third optical spots for tracking are projected on a straight line at symmetrical positions with the first optical spot as the center of symmetry. Third
It is well known that a tracking error detection method that detects a tracking error based on the reflected light generated on the signal surface of an information recording medium by a light spot has also been used. Even when reproducing information signals recorded at high density on an information recording medium, the reproduction operation is normally performed under tracking control operation, and the reproduction of information signals from the information recording medium is normally performed under tracking control operation. When this is performed optically, the tracking control operation is performed using a tracking control signal generated based on a tracking error signal detected by, for example, the various tracking error detection methods described above.

Now, a compact disc is known as an information recording medium in which information signals are recorded at high density by an array of pits corresponding to the information signals on the signal surface of the information recording medium. Information signals are recorded on the signal surface by an array of pits with depths set in a specific relationship with respect to the signal surface, and the entire surface of the signal surface is covered with a thin film of aluminum. It is specified that the reflectance of the land portion on the signal surface for light with a wavelength of 780 nm is 70% to 90%, and the readout of information signals from the signal surface of the information recording medium is I try to do this using spots of light.

When reading an information signal from the compact disc described above, the amount of light reflected from the pit portion on the signal surface of the compact disk is greater than the amount of reflected light from the land portion as a result of light interference occurring at the pit portion. Tracking error information is also obtained by using the difference between the amount of reflected light from the recorded trace area and the amount of reflected light from the land area. It is being done.

A compact disc has an information signal recorded on the signal surface of the information recording medium by an array of pits according to the information signal, and an aluminum reflective film is coated on the entire signal surface. The reflectance of light is the highest in the part of the pit caused by the information signal, and the reflectance of light is the lowest in the pit part due to the information signal, and most of the write-once information recording media and erasable information recording media are When the recording layer is irradiated with intensity-modulated light or other recording beam, the light reflectance of the portion of the recording layer irradiated by the recording beam is the same as that of the portion not irradiated by the recording beam. As mentioned above, the compact disc, the write-once information recording medium, and the erasable information recording medium are equipped with a recording layer that has a property that increases the reflectance of light. For most information recording media, the light reflectance of the land portions of the media is the highest in the former, while it is the lowest in the latter, so they have an opposite relationship. There is.

Therefore, when playing most of the above-mentioned write-once information recording media and erasable recording media, the generally popular compact disc playback device cannot be used as is.

In order to solve the above-mentioned problems, the applicant company first developed a method that, when the recording layer is irradiated with intensity-modulated light or other recording beam, the area of the recording layer irradiated by the recording beam is Generally speaking, it is a special method of recording on an information recording medium that has a recording layer that has a property that the reflectance of light is higher than the reflectance of light in the area that is not irradiated with the recording beam. An information signal recording method that can obtain a recorded information recording medium in a state in which the information signal can be reproduced by using a popular compact disc reproduction device as is, that is, an information signal recording method that can be used to reproduce information signals using a widely used compact disc reproduction device. A recording beam whose intensity is modulated by an information signal is used to form a recording trace of the information signal on the information recording medium, and also to form a recording trace of the information signal on the information recording medium between adjacent recording traces of the information signal. We also proposed a method for recording information signals by irradiating a recording beam in an unmodulated state.

(Problem to be solved by the invention) According to the previously proposed information signal recording method described above.

Although it is easy to obtain a recorded information recording medium disc in a state where information signals can be reproduced by using a generally popular compact disc playback device as is, In order to record information signals at high density, it is necessary to use a transport mechanism with extremely high mechanical precision to transport the recording element in the radial direction of the information recording medium disc. However, a recording device using such a transport mechanism is large and extremely expensive.

In order to solve the above-mentioned problems, the applicant company records an information signal on the recording layer of an information recording medium disk using a first light spot of a laser beam whose intensity is modulated according to the information signal to be recorded. At the same time, a second laser beam of unmodulated laser light is applied to land portions between adjacent recording traces of the information signal in the recording layer of the information recording medium disk. As an information recording medium disc on which information signals are recorded using an information signal recording method in which a light spot is irradiated and an unmodulated signal is recorded thereon.

The first point mentioned above. A plurality of record trace patterns with predetermined accurate record trace intervals are preliminarily set geometrically in an outer part or an inner part adjacent to the recording area where recording is to be performed by the second light spot. Using a record mark pattern formed by a change in the geometrical shape, a record trace that is continuous with the record trace pattern previously formed by the change in the geometric shape described above is formed by the first light spot of the laser beam. At the same time, the second light spot of the laser light is projected onto the land portion between the two recording marks that have been recorded by the first light spot of the laser light. Tracking error information is obtained from the light reflected from the recording layer of the information recording medium disc by the second light spot of the laser light, and based on the tracking error information, the first light spot of the laser light is
．． An information signal recording method has been proposed in which tracking control is performed on the second light spot, thereby making it possible to solve the above-mentioned problems.

However, when the information recording medium disc is configured to be removably attached to the recording device, the first
．． Geometrically, a predetermined accurate recording trace interval is maintained in the outer part or inner part adjacent to the recording area set on the information recording medium disc to be recorded by the second light spot. The positions of the plurality of record trace patterns provided as changes in shape do not necessarily always have a constant relative position with respect to the center position of the rotational drive shaft of the information recording medium disk in the recording device. The information recording medium disc is not necessarily attached to the recording device in this state.

In other words, the diameter of the center hole provided in the information recording medium disk is made slightly larger than the diameter of the rotating shaft in order to allow the information recording medium disk to be freely attached to and removed from the rotating shaft provided in the recording device. Because it's being done.

Information V! When the recording medium disk is mounted on the rotating shaft of the recording device, it is inevitable that eccentricity will occur in the information recording medium disk.
This is also because the center provided on the information recording medium disk and the position of the hole body are slightly shifted from one information recording medium disk to another.

Due to the above-mentioned variations in the information recording medium disk and variations in mechanical accuracy that exist in individual recording devices, the home position of the recording element in each recording device may be different for all recording devices. When the recording device is put into recording standby mode due to reasons such as irregularities in ! 8@The first . Geometrically, a predetermined accurate recording trace interval is maintained in the outer part or inner part adjacent to the recording area set on the information recording medium disk where recording is to be performed by the second light spot. The spots of the first and second laser beams are not always projected onto specific positions of the plurality of record trace patterns that are previously provided as changes in shape.

Therefore, even if there are variations due to the various causes mentioned above, V! The first laser beam when the recording element of the recording device is at the home position. The second light spot is always projected onto the recording traces in the area where the plurality of recording trace patterns provided in advance on the information recording medium disc exist as described above. In order to do this, the area in which the record traces should be provided should have a width of 1, for example 2, that can cover the variations due to the various causes mentioned above.
11 on the order of 00 to 500 microns.

However, in an information recording medium disk for high-density recording, a large number of recording marks are formed in an area having the width as described above, so when the recording apparatus is set to the recording mode, the first . After the second light spot is projected onto any of the recording marks in the above-mentioned area, the first and second light spots of the laser light are projected onto the end of the last record trace in the above-mentioned area. It may take a considerable amount of time to reach the point where the actual recording operation can be started.

Therefore, as a means to solve the above-mentioned problem, when the recording apparatus is in the recording standby state, the first . Information on how far the position of the second light spot is ahead of the position of the final recorded trace in the area described above is obtained, and based on that information, the position of the first spot of the laser light is obtained. It is conceivable to rapidly move the second light spot to the final recording trace in the above-mentioned area and wait there; one embodiment of this is to project the second light spot into the above-mentioned area. 1st. In order to obtain the position information of the second light spot, an address signal is recorded in advance on each of the recording traces in the above-mentioned area, and the address signal is read by the first light spot tracing the recording trace. An attempt was made to do so.

However, after the recording device starts the recording operation of the information signal, the first light spot that follows the recording trace in the above-mentioned area is used to record the information signal on the recording layer of the information recording medium disk. Since it is used in a state where the intensity is modulated by the signal, when the recording device is in the recording standby state as described above, the first light spot is used to read the address signal in the recording trace in the above-mentioned area. If used, it becomes necessary to provide the recording apparatus with means for detecting a signal from the reflected light of the first light spot, thereby complicating the configuration of the recording apparatus.

(Problems to be Solved by the Invention) The present invention provides a second light spot that is projected onto land portions between recording traces on an information recording medium disc and is used to detect tracking error information. In order to solve the above-mentioned problem, the address signal is recorded on the land between each recording trace in the above-mentioned area so that it can also be used for reading. An information recording medium disc that can reliably extract the address signal that has been detected, and can also accurately detect tracking error information even when an address signal is present on the land, that is, the object of recording. The first light spot of the laser beam whose intensity is modulated by the information signal set in the information recording medium disk forms a recording trace of the information signal on the recording layer of the information recording medium disk, and the recording layer of the information recording medium disk is A second light spot of an unmodulated laser beam is also irradiated onto the land between adjacent recording traces of the information signal, so that an unmodulated signal is recorded there. An information recording medium disc on which information signals are to be recorded using the information signal recording method described in the above-mentioned first embodiment. In the inner part adjacent to the recording area where recording is to be performed by the second light spot, the eccentricity of the information recording medium disk and the large variation in the home position position of the light spot of the laser light in each recording device A record trace pattern in which a predetermined accurate record trace interval is maintained is formed in advance by changing the geometric shape in an area having a width larger than that of the record trace pattern. The above-mentioned light spot appears near a specific radius of the information recording medium disk in the land between the recording traces in a shorter time than the period corresponding to the frequency of the gain intersection in the tracking servo system used in the recording device. Each predetermined address signal is recorded in advance so as to fit within a length that can be passed, and the recorded trace pattern is adjacent to the inside of the area recorded as a change in geometric shape. The above-mentioned problems are solved by providing an information recording medium disc in which a signal indicating a reference rotational phase of the information recording medium disc is prerecorded in a region.

(Example) Hereinafter, detailed contents of the information recording medium disk and its recording device of the present invention will be specifically explained with reference to the accompanying drawings. FIG. 1 is a plan view of an example configuration of an information recording medium disk of the present invention, and FIG. 2 is an information recording medium illustrating the manner in which information signals are recorded on the information recording medium disk shown in FIG. 1. FIG. 3 is an enlarged plan view of a portion of the disc, FIG. 3 is a side view of a portion of a recording device used for recording information signals on the information recording medium disc of the present invention, and FIG. 4 is an information recording medium of the present invention. FIG. 5 is a side view showing an example of the configuration of an optical system unit used when recording information signals on a disk, and FIG. 5 is a block diagram showing an example of the configuration of a recording device.

In the information recording medium disc of the present invention shown in the first diagram, an information signal is recorded on the recording layer of the information recording medium disc by a first light spot of a laser beam whose intensity is modulated by an information signal to be recorded. A second light spot of a laser beam in an unmodulated state that forms a trace and also applies to land portions between adjacent recording traces of recording traces caused by information signals in the recording layer of the information recording medium disk. A recording area RD is set to record an information signal using an information signal recording method in which an unmodulated signal is recorded thereon by irradiating the recording area RD.
A first recorded area, which is set to have a width larger than the eccentricity of the information recording medium disc and the variation in the home position position of the laser beam spot in each recording device, in the inner part adjacent to the first recorded area. PGD, and a second recorded area SPD set at an inner portion adjacent to the area PGD, and the first recorded area PGD has a predetermined accurate recording trace interval. A record trace pattern in which the information is retained is formed in advance by changing the geometrical shape, and a record trace pattern is formed in advance by changing the geometrical shape, and in the vicinity of a specific radius of the information recording medium disk in the land between each record trace of the record trace pattern. , each predetermined address is such that the light spot falls within a length that can be passed through in a shorter time than the period corresponding to the frequency of the gain intersection in the tracking servo system used in the recording device. Let the signal be recorded in advance, and furthermore.

The second recorded area SPD has a configuration in which a signal indicating the reference rotational phase of the information recording medium disk is recorded in advance.

Note that the X-X line position in FIG. 1 corresponds to the recording start position of the address signal recorded in each recording trace in the recording trace pattern recorded in the first recorded area PGD. This is a line that includes the radius of the information recording medium disk.

Also, instead of setting the second recorded area SPD indicated by a dotted line in FIG. 1 to the part indicated by a solid line in FIG. This is to indicate that it may be set at any position.

FIG. 2 shows enlarged views of a part of the first recorded area PGD and a part of the second recorded area SPD shown in FIG. ,SP
2 is a diagram schematically showing the recording mode of information signals in FIG. 2, and the line XX in FIG. 2 corresponds to the line XX in FIG.

In FIG. 2, Sa is the first recorded area PG mentioned above.
In the vicinity of a specific radius of the information recording medium disk in the land between each recording trace of the recording trace pattern in D, a period shorter than the period corresponding to the frequency of the gain intersection in the tracking servo system used in the recording device These are respective predetermined address signals that are recorded within a length that the light spot can pass through.

Further, in FIG. 2, Sp is a reference rotational phase signal of the information recording medium disk previously recorded in the second recorded area SPD, and 81. in the figure. S2 is the first laser beam. This is an example of the relative positions of the second light spots St, S2, and R is the rotation direction of the information recording medium disc.

Note that in FIG. 2, the areas indicated by diagonal lines are areas where the reflectance of light is low, and the white areas are areas where the reflectance of light is high.

A plurality of recording traces provided in advance with a predetermined accurate recording trace interval maintained in a first recorded area PGr set in an outer part or an inner part adjacent to the recording area RD in the information recording medium disk. The recording trace pattern may be such that a change in a predetermined geometrical shape having a lower light reflectance than the land portion appears on the recording layer of the information recording medium disk, and the above-mentioned For example, the geometrical shape may be changed by mechanically forming continuous spiral grooves on the substrate of the information recording medium disk. In addition,
As mentioned above, the reflectance of the light of the recording trace recorded in advance in the first recorded area PGD is calculated as the average light of the recording trace recorded and formed in the area RD by the first light spot of the laser beam. It is a desirable embodiment to make the reflectance approximately equal to the reflectance of . The grooves as described above can also be formed on the substrate of the information recording medium disc by transferring the grooves onto the substrate using a stamper using means well known in the disk manufacturing technology.

Further, the signal Sp indicating the reference rotational phase of the information recording medium disc, which is recorded in advance in the second recorded area SPD of the information recording medium disc, can be obtained as long as the information at the time of the start of the signal is obtained. , the length may be any suitable length as long as it does not cover one circumference of the information recording medium disk, and the reference rotation of the information recording medium disk is recorded in advance in the second recorded area SPD of the information recording medium disk. The signal Sp indicating the phase is also
As in the case of forming the recording trace pattern in the first recorded area POD described above, for example, grooves of a predetermined shape may be mechanically formed on the substrate of the information recording medium disk.
In order to form the grooves as described above on the disc-shaped substrate integrated with the information recording medium 23, well-known means in the disk manufacturing technology can be applied, and the grooves can be transferred onto the substrate using a stamper.

Here, matters related to the address signal Sa recorded on the land between each recording trace in the first recorded area P GD will be described. As already mentioned, the information recording medium disc of the present invention is used to detect tracking error information from the reflected light of the second light spot S2 of the laser light projected onto the land. , the presence of the address signal Sa recorded on the land in the first recorded area PGD is detected as tracking error information by the second light spot of the laser beam projected onto the land. It shouldn't be.

Therefore, the address signal Sa recorded near a specific radius of the information recording medium disk in the land between each recording trace in the first recorded area POD is the gain intersection point of the tracking servo system used in the recording device. The presence of the address signal Sa indicates that the first recorded area P is in such a state that the light spot can pass through in a shorter time than the period corresponding to the frequency.
This is to ensure that the tracking control operation in the GD is not adversely affected.

The above points will be explained using a specific example. Now, assuming that the width of the first recorded area P GD is Q, 5 mm, and the recording trace interval (track pitch) is 1.6 microns, in this case, the width of the first recorded area PG D is 5 mm. The number of records created will be 313. The number of bits required to attach addresses to all the records mentioned above is 9 bits, but the address signal consists of 26 bits in total, using 18 bits for the address and 8 bits for the synchronization bit. If the diameter of the light spot is 3 microns, the length of the address signal will be 78 microns. Assuming that the relative linear velocity between the light spot and the information recording medium disc is 1.2 meters per second, the time required for the light spot to pass through an address signal with a length of 78 microns is 65 microseconds.

The frequency of the gain intersection of the tracking servo system is set to 1.5K.
Hz, the frequency of the gain intersection of the tracking servo system described above is 1. ．． The period corresponding to 5 KHz is 666 microseconds. Generally, even if a signal with a period of 1/10 of the period corresponding to the gain intersection frequency of the servo system is input to the servo system, if the error signal is held in the servo system, the signal with the length as described above can be obtained. It is possible to ensure that the presence of a signal with the length described above does not adversely affect the operation of the servo system, and even if the servo system is prevented from holding the error signal, the presence of a signal of the length described above can Therefore, in carrying out the present invention, in the first recorded area PGD, the information recording medium is recorded near a specific radius in the land between each recording trace in the first recorded area PGD. The length is such that the light spot can pass through the address signal Sa in a time less than 1/10 of the period corresponding to the frequency of the gain intersection in the tracking servo system used in the recording device. It is an embodiment of the invention that it is desired to be in a state where it can be accommodated in the case.

Note that the signal Sp indicating the reference rotational phase of the information recording medium disc recorded in the second recorded area SPD can also be well used as a timing signal when holding the error signal of the tracking servo system. Can be done.

Here, the first. An outline of how each signal pre-recorded in each second recorded area is used for the recording operation when recording the information signal on the information recording medium disk. Explain.

The information recording medium disc having the above-mentioned configuration uses the first light spot of the laser beam whose intensity is modulated by the information signal to be recorded in the recording area RD of the information recording medium disc. In addition to forming recording traces of information signals on the recording layer, a non-modulated record is also formed on land portions between adjacent recording traces of information signals on the recording layer of the information recording medium disc. - Recording of information signals is performed by an information signal recording method in which a second light spot of the laser light is irradiated and an unmodulated signal is recorded there. During the recording standby mode prior to the start of the recording operation of the information signal to the area RD, the recording area RD described above
The first recorded area P provided in the inner part adjacent to
The first laser beam projected onto GD. The first light spot of the second light spot maintains a predetermined accurate recording trace interval in the first recorded area PGr) by changing its geometrical shape by the operation of the tracking control system. The laser beam correctly traces the recording trace in the recording trace pattern recorded in advance, and the second optical spot of the laser beam is geometrically aligned with respect to the first recorded area PGD by the operation of the tracking control system. The address signal Sa recorded in the trace is reproduced by correctly tracing the land between the two traces in the prerecorded trace pattern while maintaining a predetermined accurate trace interval by changing the shape. be made to do.

=28- Then, as mentioned above, the second light spot of the laser beam projected onto the land part in the first recorded area PGD is the address signal S recorded on the land.
a, and is also used to detect tracking error information, and the first . The spot of the second light is tracked and controlled. The first laser beam mentioned above. Displacement driving of the second light spot is performed by displacing and driving the condensing lens by an actuator to which an output signal from the tracking control system is supplied.

The address signal Sa read by the second light spot of the laser beam as described above is information pre-recorded in the second recorded area SPD area adjacent to the inside of the first recorded area PGD. The first and second light spots of the laser light are extracted by a gate signal generated based on the output signal of a photosensor that detects a signal Sp indicating the reference rotational phase of the recording medium disk, and the first and second light spots of the laser light are The spot is moved to the last recording trace formed in the first recorded area POD in a short time.

The first light spot of the laser beam is the first recorded area POD
When reaching the end of the final recording trace in the recording traces formed in , the signal Sp indicating the reference rotational phase of the information recording medium disk previously recorded in the second recorded area SPD area is detected. A kick pulse generated based on the output signal of the photosensor that detects the laser beam is supplied to the actuator. The second light spot is such that the first light spot is located in the first recorded area P.
It is rapidly displaced from the end of the last trace formed in the OD to the end of the previous trace by one trace interval. This state continues as long as the recording device is in a standby state.

Next, a recording apparatus that records information signals using an information recording medium disc having the above-described configuration will be described. FIG. 3 is a side view of a part of the mechanical part of the recording device, and in this FIG. 3, D is an information recording medium disc;
Further, 1 is a driving motor, 2 is a rotating shaft, 3 is a turntable, and 4 is a clamper, and the information recording medium disc is mounted on the turntable 3 fixed to the rotating shaft 2 of the driving motor 1. After being placed, it is fixed by a clamper 4 and driven and rotated by a drive motor 1 at a predetermined rotation speed. The drive motor 1 described above is always driven and rotated at a predetermined rotation speed by a speed control circuit (not shown).

Further, in FIG. 3, 5 is a condenser lens, 6 is an actuator unit, 7 is an optical system unit, 8 is a rail for guiding the optical system unit 7 in the radial direction of the information recording medium disc, 9.10 is a support for the rail 8 described above.

In FIG. 3, F is a transfer mechanism for the optical system unit 7, and in the illustrated example, the transfer mechanism F includes a transfer motor 11, spur gears 12-17, pinions 18-. 31 - and a rack 19, and the rack 1 is fixed to the optical system unit 7.
The optical system unit 7 is transferred along the rail 8 by transmitting the rotational force of the transfer motor 11 at a reduced speed by the spur gears 12 to 17 to the pinion 18 meshing with the pinion 9 .

Note that 20 is a photosensor for detecting a reference rotational phase signal from the information recording medium disc.

Next, FIG. 4 is a side view showing an example of the configuration of the optical system 7 used in the recording apparatus, and in FIG.
2 is the first. 23.24 is a collimating lens, 25 is a polarizing prism, 26.28 is a quarter-wave plate, 27 is a dichroic mirror, 29 is a detection system for focus error, tracking error, and address signal, 30 is a focus Control and tracking control system, 6
32 is an actuator unit, 32 is a signal detection system, and 5 is a condensing lens.

In the optical system unit 7 shown in FIG. 4, the first semiconductor laser 21 emits laser light whose intensity is modulated according to the information signal to be recorded during the recording mode operation. The first semiconductor laser 21 emits a laser beam having a wavelength of, for example, 780, which is intensity-modulated by the information signal to be recorded during a recording operation in a recording mode.
nm laser light is emitted. First semiconductor laser 21
emits laser light with a predetermined constant light intensity in the recording standby mode.

The laser light emitted from the first semiconductor laser 21 is reflected from the collimating lens 23 → polarizing prism 25 → quarter-wave plate 26 → light with a wavelength of 780 nm, and has a wavelength of 830 nm.
Dichroic mirror that transmits m light - 27 → 1/4
The first light spot S passes through the optical path of the wavelength plate 26 → polarizing prism 25 → quarter wavelength plate 28 → condensing lens 5 → recording layer of the information recording medium disc and onto the recording layer of the information recording medium disc.
By being imaged as 1, an information signal is recorded on the recording layer of the information recording medium disk during the recording operation in the recording mode. The reflected light from the first light spot S1 follows the optical path of the condenser lens 5 → quarter-wave plate 28 → polarizing prism 25 → toward the collimating lens 24, but what is this light used for? is also not used.

Further, in the optical system unit 7 shown in FIG. 4, the second semiconductor laser 22 is a semiconductor laser used as a semiconductor laser that emits laser light in an unmodulated state, and this second semiconductor laser 22 A laser beam for land irradiation with a constant intensity and a wavelength of, for example, 830 nm is emitted from the laser beam.

The laser beam with a constant intensity and a wavelength of 830 nm emitted from the second semiconductor laser 22 is collimated by the collimating lens 24 → polarizing prism 25 → 1/4 wavelength plate 28 → condensing lens 5 → recording on the information recording medium disk. By being imaged as a second light spot S2 on the recording layer of the information recording medium disk through the optical path of the layer, recording is performed by the first light spot S1 on the recording layer of the information recording medium disk. The lands between adjacent recording traces of recorded information signals produced by the information signal are irradiated with laser light of a certain light intensity as described above during the recording operation in the recording mode, so that the lands are uniformly highly reflective. Made to rate status. The second light spot S2 of the land laser light and the first light spot Sl have approximately the same energy density.

The reflected light from the second light spot S2 is transmitted through the condenser lens 5→1/4 wavelength plate 28→polarizing prism 25→1/4 wavelength plate 28→polarizing prism 25→1/4 wavelength plate 28
4-wavelength plate 26 → dichroic mirror 2 that reflects light with a wavelength of 780 nm and passes light with a wavelength of 830 nm
After passing through the optical path 7→, it enters a detection system 29 for focusing errors, tracking errors, and address signals.

A detection system 29 for focus error, tracking error, and address signal generates a tracking error signal by, for example, a push-pull method using the reflected light from the spot S2 of the second light incident thereon, and also detects, for example, astigmatism. A focus error signal is generated by a method, and the generated tracking error signal and focus error signal are supplied to a focus control and tracking control system 30, and the focus control and tracking control system 30 supplies a drive signal to an actuator unit. The condensing lens 5 is driven and displaced, and the first and second light spots S are projected onto the recording layer of the information recording medium disk.
L and S2 are always in focus, and the sequential recording traces formed by the ]th light spot S1 are recorded on the recording layer while maintaining a predetermined interval between recording traces. When the apparatus is operating in standby mode, the focus error, tracking error, and address signal detected by the address signal detection system 29 are sent to the address signal signal processing system in the recording apparatus.

FIG. 5 is a block diagram showing an example configuration of a recording device for an information recording medium disk, and in the block diagram shown in FIG. 5, each configuration of the recording device shown in FIG. Components corresponding to the parts are given the same drawing symbols as those used in FIG. 3.

Further, in FIG. 5, 35 is an input terminal for a signal to be recorded, 36 is an output terminal for a reproduced signal, LDAI, LD
A2 is a laser drive amplifier, MOD is a signal modulation circuit, AM
P is an amplifier, SAG is a signal processing circuit, ASEP is an address signal separation circuit, 0PCC is a control circuit, op is an operation unit,
wpc is a waveform shaping circuit, MIX is a mixing circuit, TSC is a tracking control circuit, FSC is a focus control circuit, ○
PC is an arithmetic circuit.

When an information signal is to be recorded on an information recording medium disc by the recording device, the information recording medium disc is placed on the turntable 3, fixed by the clamper 4, and the power switch is turned on.

As a result, the drive motor 1 is rotated at a predetermined number of revolutions by the operation of a speed control circuit (not shown), and the information recording medium disc fixed to the turntable 3 is also driven and rotated at a predetermined number of revolutions.

When the user inputs the recording mode to the operating section OP of the recording device, the condenser lens 5, actuator unit 6, optical system unit 7, etc. are transported in the radial direction of the information recording medium disc by the transport mechanism F. until it reaches the home position and stops. In this state, the control circuit op
Drive power is supplied to the semiconductor lasers 21 and 22 provided in the optical system unit 7 by control signals given from the cc to the laser drive amplifiers LDAI and LDA2, and laser light is emitted from the semiconductor lasers 21 and 22. The first laser beam. A second light spot Sl, 82 is projected onto the first recorded area PGD on the information recording medium disc.

The first laser beam mentioned above. The first light spot St among the second light spots St creates a predetermined accurate recording trace interval in the first recorded area PGD by changing the geometrical shape by the operation of the tracking control system. The recording trace pattern recorded in advance is correctly traced while the laser beam is being held, and the second laser beam is
By the operation of the tracking control system, the light spot is formed in the record trace pattern recorded in advance with a predetermined accurate record trace interval maintained by changing the geometric shape with respect to the first recorded area PGD. The land between the two records is traced correctly.

In other words, the second light spot S2 of the laser beam when the recording apparatus is in the recording standby mode is set to a predetermined accuracy due to a change in the geometrical shape in the first recorded area PGD of the information recording medium disc. The light is projected onto the part of the record trace pattern recorded while maintaining a record trace interval, but the optical system unit 7 having the configuration already described with reference to FIG. 4 is used as the optical system unit 7. In this case, the laser beam with constant intensity and wavelength of 830 nm emitted from the second semiconductor laser 22 in FIG.
→ Condensing lens 5 → The optical path of the recording layer of the information recording medium disc is focused on the recording layer of the information recording medium disc as a second light spot S2, and from this second light spot S2 The reflected light has a wavelength of 780 nm-
After passing through the optical path of the dichroic mirror 27 → which reflects the light with a wavelength of 31J − and passes the light with a wavelength of 830 nm, it enters the detection system 29 for focus error, tracking error, and address signal, and detects the focus error, tracking error, and address signal. The address signal detection system 29 uses the reflected light from the spot S2 of the second light incident thereon.

For example, a tracking error signal is generated by a push-pull method, and a focus error signal is generated by, for example, an astigmatism method, and the generated tracking error signal and focus error signal are supplied to the focus control and tracking control system 30. , the focus control and tracking control system 30 supplies a drive signal to the actuator unit 6 to drive and displace the condenser lens 5,
The first and second light spots SL and S2 projected onto the recording layer of the information recording medium disc are always in focus, and
A recording trace in which a first light spot S1 is recorded in advance in a first recorded area PGD on an information recording medium disc with a predetermined accurate recording trace interval maintained by changing the geometric shape. Make sure to follow the traces in the pattern correctly.

Further, the second light spot S2 of the laser light is moved to the first recorded area P by the operation of the tracking control system.
By changing the geometric shape of the GD, it is possible to correctly trace the land between two traces in a prerecorded trace pattern while maintaining a predetermined accurate trace interval. . In the block diagram shown in FIG. 5, the arithmetic functions of the focus error, tracking error, and address signal detection system 29 blocks shown in the optical system unit 7 shown in FIG. 4 are separated as a block OPC. The functions of the focus control system and the function of the tracking control system of the focus control and tracking control system 30 shown in the optical system unit 7 shown in FIG. The tracking control circuit TSC block is shown independently as a block.

Now, as described above, the information recording medium disc used for recording information signals in the present invention has a first recorded area PGD.
The address signal Sa recorded in the vicinity of a specific radius of the information recording medium disk in the land between each recording trace of It is assumed that the address signal Sa is in such a state that the light spot is within a length that the light spot can pass in a short time, and the presence of the address signal Sa has an adverse effect on the tracking control operation in the first recorded area PGD. Therefore, the addresses of all the recorded traces in the first recorded area can be known by the spot of the second laser beam projected onto the land.

By pre-recording a predetermined address signal Sa on each land in the first recorded area PGD on the information recording medium disc as described above, the second light of the laser light for the land is Spot S2 can be used both for detecting tracking error information and reading address signals, and a single detection system can detect tracking error information and read address signals. The system can be simplified.

As mentioned above, the first recorded area P of the information recording medium disc
The second light spot S2 of the laser beam projected onto the land portion in GD is located in the first recorded area PG.
In addition to reading the predetermined address signal Sa recorded on each land of D, it is also used to detect tracking error information, and the detected tracking error information is converted into a tracking error signal in the arithmetic circuit OPC and sent to the tracking control circuit. A focus error signal supplied to the TSC and output from the arithmetic circuit oPC described above is supplied to a focus control circuit FSC.

The tracking control signal generated by the tracking control circuit TSC is supplied to the actuator unit 6 via the mixing circuit MIX, and the focus control signal generated by the focus control circuit FSC described above is supplied to the actuator unit 6. The first laser beam is Second light spot 81. S2 is subject to focus control and tracking control.

Further, the address signal Sa read by the second light spot S2 of the laser light and the signal read by the first light spot S1 of the laser light are amplified by the amplifier AMP, and then the address signal separation circuit ASEP and signal processing circuit S
AC and the signal processed by the signal processing circuit SAC is sent to the output terminal 36.

In the address signal separation circuit ASEP described above, the waveform shaping circuit W is based on the signal Sp indicating the reference rotational phase of the information signal recording medium disc detected by the photosensor 20.
Separate the address signal using a gate pulse that corresponds to the time position of the address signal Sa generated by the PC,
The separated address signal Sa is supplied to the control circuit opcc. The control circuit 0PCC determines the addresses of successive recording traces based on the address signal Sa supplied thereto, and selects the first... Second light spot Sl.

The address where 82 is located is the first recorded area P
Calculates how far ahead the address of the last recorded trace is in the recorded trace pattern recorded in advance on the GD, generates the necessary kick pulse based on the result, and sends it to the mixing circuit MIX. supply

In the mixing circuit MIX described above, the tracking control circuit T
The tracking control signal sent from the SC and the kick pulse sent from the control circuit OPCC are mixed and supplied to the actuator unit 6, and the actuator unit 6 displaces and drives the condensing lens 5 to generate a laser beam. 1st. The second light spot Sl, 82 is caused to rapidly approach the last recorded trace in the recorded trace pattern previously recorded in the first recorded area PGD.

Then, the control circuit opcc outputs the first laser beam according to the address signal supplied thereto. The number of kick pulses is decreased as the position of the second light spot Sl, 82 approaches the final recording trace in the recording trace pattern previously recorded in the recorded area POD,
The first and second laser beam spots 81 and 82 are the first and second beam spots.
To smoothly move to the final recorded trace in a recorded trace pattern previously recorded in a recorded area PGD and to be located at the final recorded trace.

When the recording apparatus is in the recording standby mode, the control circuit opcc outputs the first laser beam. Second light spot Sl, 8
2 reaches the end of the final recording trace in the recording trace pattern previously recorded in the first recorded area POD, the control circuit ○Pcc instructs the mixing circuit MIX to transmit the laser beam to the first. , a kick pulse that drives the second light spots Sl and S2 to be displaced from the end of the last recording trace in the recording trace pattern recorded in advance in the first recorded area PGD to the end of the previous recording trace. supply.

By supplying the kick pulse described above to the actuator, the 11th and 2nd light spots of the laser beams are set in the recording trace where the first light spot is formed in the first recorded area PGD. From the end of the final record,
It is rapidly displaced to the end of the previous trace by one trace interval. This state continues while the recording device is in the standby mode, and the first light spot s1 of the laser beam is the final spot in the first recorded area PGD while the recording device is in the standby mode. You will be left in a state where you are repeatedly following a record trail.

The first light spot S1 of the laser beam is the first recorded area P
When a command to start recording is input to the operation unit OP while the last record trace formed on the GD is being repeatedly traced, the control circuit ○PCC stops supplying the above-mentioned kick pulse, Thereby, a record trace formed by the first light spot S1 of the laser light whose intensity is modulated by the information signal targeted for recording is provided in advance in the first recorded area PGD. A recording trace that is continuous with the end portion of the recorded trace pattern and always separated by a predetermined recording trace interval TP is recorded and formed on the recording layer by the first light spot S1 of the laser beam. .

Recording traces that are sequentially formed on a recording layer of an information recording medium disc by a first light spot s1 of a laser beam whose intensity is modulated according to an information signal to be recorded. It goes without saying that the interval is always the predetermined trace interval TP.

That is, the recording traces that are sequentially recorded and formed on the recording layer of the information recording medium disk by the first light spot S1 of the laser beam whose intensity is modulated by the information signal to be recorded are This is because areas with high light reflectance and areas with low light reflectance are arranged alternately in sequence according to the recorded information signal.

Since the average light reflectance of the recording trace is lower than the light reflectance of the land portion, the second light spot S2 of the laser beam is.

By projecting the first light spot S1 of the laser light onto the middle of the two recording marks that have been recorded, an information recording medium can be created by the second light spot S2 of the laser light. The t-racking error information is obtained by the reflected light from the recording layer of the disk, and thereby the 11th... Second light spot S
Tracking control is performed on S2, and the intensity is modulated by the information signal targeted for recording.
The recording traces that are sequentially recorded and formed by the first light spot S1 of the norther light are set at a predetermined recording trace interval TP in a recording trace pattern previously provided in the area PGD.
This is because the recording traces are always kept at the predetermined interval TP, following the recording traces that are formed with the distance between them.

(Effects) As is clear from the detailed explanation above, the information recording medium disc of the present invention is intensity-modulated by the information signal to be recorded. In this way, a recording trace by the information signal is formed on the recording layer of the information recording medium disc, and a land portion between adjacent recording traces of the recording trace by the information signal in the recording layer of the information recording medium disc is formed. An information recording medium disk on which an information signal is to be recorded using an information signal recording method in which a second light spot of a laser beam in an unmodulated state is irradiated and an unmodulated signal is recorded there. The above-mentioned 1. In the inner part adjacent to the recording area where recording is to be performed by the second light spot, the eccentricity of the information recording medium disk and the large variation in the home position position of the light spot of the laser light in each recording device In an area with a width larger than that,
A record trace pattern in which a predetermined accurate record trace interval is maintained is formed in advance by changing the geometric shape, and an information recording medium is provided in lands between each record trace of the record trace pattern. Near a specific radius of the disk, the light spot is placed within a length that allows the light spot to pass through in a shorter time than the period corresponding to the frequency of the gain intersection in the tracking servo system used in the recording device. Predetermined address signals are recorded in advance, respectively, and a standard of the information recording medium disk is recorded in an area adjacent to the inside of the area where the above-mentioned record trace pattern is recorded as a change in geometric shape. Since the information recording medium disc is configured such that a signal indicating the rotational phase is recorded in advance, in the information recording medium disc of the present invention, the information recording medium disc is configured such that a signal indicating the rotational phase is recorded in advance. In the standby mode of recording operation,
A second laser beam beam is projected at a position spaced apart from the first laser beam spot by a recording trace interval TP]-/2 in the width direction of the recording traces.
from the second light spot S2 so that the light spot is located between two adjacent recording traces in the recording traces provided in advance in the first recorded area PGD. A tracking control operation is performed using the reflected light, and the first . The second light spot is always in focus,
Furthermore, the sequential recording traces recorded and formed by the first light spot also include the two records that the second light spot of the laser light has finished recording and forming by the first light spot of the laser light. By projecting the laser beam in the middle of the trace, the tracking error information obtained by the reflected light from the recording layer of the information recording medium disk by the second spot of the laser beam can be used to 2
Tracking control is performed on the light spot of
A recording trace that is sequentially recorded and formed by a first light spot of a laser beam whose intensity is modulated according to an information signal to be recorded is a first recorded area POD.
Since the recording traces are always formed at the predetermined interval TP by following the recording traces formed at the predetermined interval TP in the recording trace pattern previously set, the transfer of the recording element in the recording apparatus is Even if the mechanical precision of the mechanism is not high, it is possible to sequentially form records having a constant record trace interval TP. Further, in the present invention, the gain intersection point in the tracking servo system used in the recording apparatus is located near a specific radius of the information recording medium disk in the land between each recording trace in the first recorded area POD of the information recording medium disk. Each predetermined address signal is recorded in advance so that the previous light spot can pass within a length that is shorter than the period corresponding to the frequency, and the address signal is used as the second laser light spot. The read address signal is extracted using a signal indicating the reference rotational phase of the information recording medium disk recorded in the second recorded area SPD of the information recording medium disk. Determine the address of the record trace,
Accordingly, the first light spot of the laser beam is rapidly moved to the final recording trace of the recording trace pattern in the first recorded area PGD on the information recording medium disc, and While the recording device is in the recording standby state, the laser beam is activated using a kick pulse generated based on a signal indicating the reference rotational phase of the information recording medium disc recorded in the recorded area SPD of 1st of
The light spot can be repeatedly traced to the final recording trace of the recording trace pattern in the first recorded area PGD on the information recording medium disc,
The width of the first recorded area PGD recorded in advance on the information recording medium disk is widened, and the first laser beam is emitted at the start of the recording operation. Even if the second light spot is always projected onto the recording trace in the first recorded area PGD,
Since the recording device can be set to a recording standby state in a short time and recording can be started in a short time, it is easy to simplify the recording device. Even if an address signal is recorded on the land in the land, there is no adverse effect on the tracking error detection operation performed by the second light spot of the laser beam projected onto the land. Since the second light spot for land irradiation is used for both detection of the 1-racking error and readout of the address signal, the configuration of the optical system can be simplified, and the present invention solves the above-mentioned conventional problems. The points can be resolved well.

[Brief explanation of drawings]

FIG. 1 is a plan view of an example configuration of an information recording medium disk of the present invention, and FIG. 2 is an information recording medium illustrating the manner in which information signals are recorded on the information recording medium disk shown in FIG. 1. FIG. 3 is an enlarged plan view of a portion of the disc, FIG. 3 is a side view of a portion of a recording device used for recording information signals on the information recording medium disc of the present invention, and FIG. 4 is an information recording medium of the present invention. FIG. 5 is a side view showing an example of the configuration of an optical system unit used when recording information signals on a disk, and FIG. 5 is a block diagram of an embodiment of the recording apparatus. RD: recording area, PGD: first recorded area,
SPD...Second recorded area, D...Information recording medium disc, Sa...First recorded area PGD with a predetermined accurate recording trace interval maintained. A predetermined address signal, Sp, which is pre-recorded in the vicinity of a specific radius of the information recording medium disc of the land between each record trace in a record trace pattern previously formed by a change in shape, Sp... A signal indicating the reference rotational phase of the information recording medium disc recorded in advance in the recorded area SPD, LDAI, LDA, 2...Laser drive amplifier, MOD...Signal modulation circuit, AMP...Amplifier, S
AC...Signal processing circuit, ASEP...Address signal separation circuit, OPCC...Control circuit, OP...Operation unit, WPC...Waveform shaping circuit, MIX...Mixing circuit,
TSC...Tracking control circuit, FSC...Focus control circuit, OPC...Arithmetic circuit, F...Transfer mechanism for optical system unit 7, ■...Drive motor, 2.
... Rotation axis, 3... Turntable, 4... Clamper, 5... Condensing lens, 6... Actuator unit, 7... Optical system unit, 8... Optical system unit 7 Rail for guiding when transferring the information recording medium disc in the radial direction, 9.10...Support for the above-mentioned rail 8, 11...Motor for transfer, 12-17...Spur gear, 18. ...Pinion, 19...Rack, 20...
Photosensor for detecting a reference rotational phase signal from an information recording medium disk, 21.22...1st. Second semiconductor laser. 23.24... Collimator lens, 25... Polarizing prism, 26.28... 1/4 wavelength plate, 27... Dichroic mirror, 29... Focus error, tracking error, and address signal detection system , 30・
...Focus control and tracking control system, 35...
- Input terminal for signals to be recorded, =56-36... Output terminal for playback signals,

Claims (1)

[Claims] The first light spot of the laser beam whose intensity is modulated by the information signal to be recorded forms a recording trace of the information signal on the recording layer of the information recording medium disk, and also A second light spot of an unmodulated laser beam is also irradiated onto the land between adjacent recording traces of information signals in the recording layer, and an unmodulated signal is recorded there. An information recording medium disk on which information signals are to be recorded by an information signal recording method configured to
, in the inner part adjacent to the recording area set to be recorded by the second light spot, due to the eccentricity of the information recording medium disk and the variation in the home position position of the laser light spot in each recording device. A record trace pattern in which a predetermined accurate record trace interval is maintained in an area having a width larger than the size is formed in advance by changing the geometric shape, and the record trace pattern is The above-mentioned light spot is generated near a specific radius of the information recording medium disk in the land between each recording trace in a time shorter than the period corresponding to the frequency of the gain intersection in the tracking servo system used in the recording device. Each predetermined address signal is recorded in advance so as to fit within a length that can be passed through, and the recorded trace pattern is adjacent to the inside of the area where the recorded trace pattern is recorded as a change in geometric shape. an information recording medium disk configured such that a signal indicating a reference rotational phase of the information recording medium disk is prerecorded in an area where the information storage medium is rotated;