JPS62256232A - Information recording medium disk - Google Patents

Abstract

PURPOSE:To form the recorded traces of regular intervals, by providing an area, in which prescribed recorded trace patterns and address signals are formed, and another area, in which reference rotary phases of the disk are shown, at the inside of recording area by means of two optical spots. CONSTITUTION:The disk D of this invention is composed of a recording area RD which contains recorded traces by the 1st optical spot whose intensity is modulated by information signals and signals recorded by the non-modulated second optical spot, 1st recorded area PGD at the inside of the recording area RD, and 2nd recorded area SPD at the inside of the 1st recorded area PGD. The area PGD has a width which is larger than the eccentricity of the disk D and the fluctuation of the home positions of the optical spots. In addition, recorded trace patterns held at prescribed intervals TP are previously formed by utilizing changes in geometric shapes and prescribed address signals Sa are recorded at specific locations of each recorded trace in the 1st recorded area PGD. Moreover, signals SP indicating the reference rotary phases of the disk D are previously recorded in the 2nd recorded area.

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 structural and operating principles have been used to record information signals at high recording densities. It is well known that high-density recording and reproduction of information has been carried out.1 For example, information signals are recorded by forming irregularities corresponding to the information signals on the signal surface of an information recording medium.

Recording and reproducing devices that reproduce recorded information signals by optical means or by detecting changes in capacitance have already been put into 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, information is transferred to the recording layer of the information recording medium by irradiating the recording layer of the information recording medium with a beam whose intensity is modulated by the information signal. Research has also begun on information recording media that record information signals by causing physical or chemical changes in response to the signal.
In recent years, as semiconductor lasers that operate stably have become easily available, various optical discs that use laser light for high-density recording and reproduction have already been put into practical use, or are on the verge of being put into practical use. It is well known that research and development is currently underway.

In other words, recorded optical disks (playback-only optical disks) that are mass-copied from master disks on which information signals are recorded using pits formed as geometrical concave or convex portions are, for example, video disks, compact disks, etc. In addition, optical discs that can be added and recorded only once by the user (write-once optical discs) and erasable optical discs 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) Various formats have been proposed, such as thermal transformation type (which causes changes in rate, etc.), as well as information recording media in which recording and reproducing operations are performed using energy outside the tip. Among the various types of information recording media mentioned above, information recording media that belong to the phase change type are:
It has attracted attention because of the possibility of erasing previously recorded information, and to date, phase-change information recording media have been made using chalcogenide-based materials (for example, as recording materials used in their recording layers). compositions consisting of various combinations of germanium, tellurium, antimony, silicon, arsenic, bismuth, indium, gallium, thallium, selenium, and sulfur), and those using lower oxides (for example, mixtures of Te and TeO2, etc.) Research is progressing on various types of materials, such as those using , or 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 reflectance of 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 tracking error is detected by utilizing the fact that the intensity distribution of the reflected light is biased due to the tracking error. The so-called push-pull tracking error detection method is widely used because the optical system has a simple configuration and is advantageous in terms of cost. A first light spot for signal reading is projected, and second and second light spots for tracking are projected at symmetrical positions with the first light spot as the center of symmetry on a straight line including the first light spot. By projecting the light spot No. 3, the light spot No. 3 is projected. 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 the information recording medium by the third optical slot 1 has also been used. Even when reproducing information signals recorded at high density on the various types of information recording media mentioned above, the reproduction operation is normally performed under tracking control operation, and the reproduction operation is normally performed under tracking control operation. When the information signal is reproduced optically, the tracking control operation is performed using a tracking control signal generated based on a tracking error signal detected by the various tracking error detection methods described above, for example. be.

Now, a compact disc is known as an information recording medium in which information signals are recorded at high density on the signal surface of the medium by an array of bits corresponding to the information signals. Information signals are recorded on the signal surface by an array of pits with a depth set in a specific relationship 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 an information recording medium is performed at a wavelength of 780 nm. It is done by a spot 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 the arrangement of bits according to the information signal, and an aluminum reflective film is coated on the entire surface of the signal surface. The reflectance of light is the highest in the part of the information signal, and the reflectance of light is the lowest in the part of the bit 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, Applicant Company-8 firstly, when the recording layer is irradiated with intensity-modulated light or other recording beam, the area irradiated by the recording beam is A special recording mode for an information recording medium that has a recording layer that has a property that the light reflectance of the recording layer is higher than the light reflectance of the portion that is not irradiated with the recording beam. We have developed an information signal recording method that can obtain a recorded information recording medium in a state where the information signal can be reproduced by using a generally popular compact disc reproduction device as is, that is, a recording method. A recording beam whose intensity is modulated by the targeted information signal forms a recording trace of the information signal on the information recording medium, and also allows mutual interaction between adjacent recording traces of the information signal on the information recording medium. We have proposed an information signal recording method in which the unmodulated recording beam is irradiated to the areas in between.

(Problems to be Solved by the Invention) According to the previously proposed information signal recording method described above, the information signal can be reproduced by using a generally popular compact disc playback device as is. However, in order to record information signals at a high density on the information recording medium disk, it is necessary to use a transfer mechanism with extremely high mechanical precision when recording the information signal. Therefore, it is necessary to transport the recording element in the radial direction of the information recording medium disc, but a recording apparatus 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 an information signal is to be recorded by an information signal recording method in which a light spot is irradiated and an unmodulated signal is recorded thereon, the above-mentioned 1. In the outer part or the inner part adjacent to the recording area set to be recorded by the second light spot,
Using a pattern in which a plurality of record traces maintaining a predetermined accurate record trace interval is formed in advance by changing the geometric shape, the pattern is formed in advance by changing the geometric shape described above. A recording trace that is continuous with the recording trace pattern is recorded and formed by the first light spot of the laser light, and the second light spot of the laser light is formed by the first light of the laser light. The tracking error information is obtained from the light reflected from the recording layer of the information recording medium disk by the second light spot of the laser light. Then, the first laser beam. 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 disk so that recording can be performed by the second light spot. The positions of the plurality of record trace patterns, which are provided as changes in shape, are not always necessarily in a constant position relative 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 installed in 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.

When the information recording medium disk is attached to the rotating shaft of the recording device,
This is because eccentricity of the information recording medium disk is unavoidable, and the position of the center hole itself provided in the information recording medium disk also has some deviation for each information recording medium disk.

Due to the above-mentioned variations in the information recording medium disk and variations in mechanical accuracy of individual recording devices, the home position of the recording element in each recording device may be different for all recording devices. When the recording apparatus is put into a recording standby state due to reasons such as the number being not constant, 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, the first . The spot of the second light is always projected onto the recording traces in the area where the plurality of recording trace patterns previously provided on the information recording medium disc exist as described above. In order to do this, the area in which the record traces are to be provided should be wide enough to cover the variations due to the various causes mentioned above, for example, 20
It is required to have a width of about 0 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. A situation may occur in which it takes a considerable amount of time to reach a state where the recording operation can actually be started.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention assigns addresses to recording traces in the above-mentioned areas, and when the recording device is in a recording standby state, Then, based on the address mentioned above, the first . The information necessary to operate the recording device is transmitted to the recording medium disc so that the second light spot can be rapidly moved to the final recording trace in the aforementioned area and held there. In other words, the first light spot of the laser beam whose intensity is modulated by the information signal to be recorded is used to record the information on the recording layer of the information recording medium disk in advance. In addition to forming recording traces of information signals on the recording layer of the information recording medium disk, unmodulated laser light is also applied to land portions between adjacent recording traces of information signals in the recording layer of the information recording medium disc. An information recording medium disc on which an information signal is to be recorded by an information signal recording method in which a second light spot is irradiated and an unmodulated signal is recorded thereon, and the disc is an information recording medium disc on which an information signal is to be recorded by an information signal recording method in which a second light spot is irradiated and an unmodulated signal is recorded thereon. Second
The inner part adjacent to the recording area where recording is set to be performed with the light spot of A record trace pattern with a predetermined accurate record trace interval is formed in advance in an area having a large width by changing the geometric shape, and each record trace in the record trace pattern has a A predetermined address signal is prerecorded in the vicinity of a specific radius on the information recording medium disc, and furthermore, a predetermined address signal is recorded in advance in an area adjacent to the inside of the area where the above-mentioned recording trace pattern is recorded as a change in geometric shape. provides an information recording medium disc on which a signal indicating a reference rotational phase of the information recording medium disc is recorded in advance.

(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 of the configuration of an information recording medium disk according to the present invention, and FIGS. 2 and 3 illustrate the manner in which information signals are recorded on the information recording medium disk shown in FIG. It is an enlarged plan view of a part of the information recording medium disc,
Further, FIG. 4 is a side view of a part of the recording device used when recording information signals on the information recording medium disk of the present invention, and FIG.
The figure is a side view showing an example of the configuration of an optical system unit used when recording information signals on the information recording medium disk of the present invention, and FIG. 6 is a block diagram showing an example of the configuration of the recording apparatus.

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.
The first recorded area P set in the inner part adjacent to
GD, and a second recorded area SPD set in an inner portion adjacent to the above-mentioned area PGD, and a predetermined accurate recording trace interval is maintained in the above-mentioned first recorded area PGD. A record trace pattern of the state is formed in advance by a change in geometrical shape, and a predetermined address signal is also preliminarily formed near a specific radius of the information recording medium disk at each record trace in the record trace pattern. Furthermore, the second recorded area S mentioned above
The PD 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 ray position in FIG. 1 corresponds to the recording start position of the address signal recorded in each record trace in the record trace pattern recorded in the 1st recorded area PGD. This is a line that includes the radius of the information recording medium disk.

In addition, the second recorded area SPD indicated by the dotted line in FIG. 1 is set in the part indicated by the solid line in FIG. This is to indicate that it may be set in the position.

FIG. 2 shows a part of the first recorded area T' G D shown in FIG. 1 and a part of the second recorded area SPD shown in FIG. Recorded area PGD
, is a diagram schematically showing the recording mode of information signals in SPD, and in this FIG.
-x.

In FIG. 2, Sa is the first recorded area PG mentioned above.
D, a predetermined accurate recording trace interval is maintained in the vicinity of a specific radius of the information recording medium disk in each recording trace in the recording trace pattern that is formed in advance by changing the geometric shape, respectively. Sp is a predetermined address signal recorded in advance, and Sp is the second address signal described above.
This is a signal indicating the reference rotational phase of the information recording medium disk which is recorded in advance in the recorded area SPD.

Further, FIG. 3 further enlarges a part of the first recorded area PGrl shown in FIG. In addition to showing the first and second beams of the laser beam! -8
1, , 82 are also shown, and the line X--X in FIG. 3 also corresponds to the line xx in FIG. 1.

The above-mentioned address signal Sa to be recorded in each recording trace in the first recorded area PGD is recorded as an address signal such that the address of the last recording trace in the first recorded area POD is, for example, a zero address. . In FIGS. 2 and 3, R is the rotation direction of the information recording medium disc,
Further, Sl is a first light spot of a laser beam whose intensity is modulated by an information signal to be recorded;
S2 is a second light spot for land irradiation.

Note that in FIGS. 2 and 3, the hatched areas are areas with low light reflectance, and the white areas are areas with high light reflectance.

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

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 PGD described above, for example, grooves of a predetermined shape may be mechanically formed on the substrate of the information recording medium disc. In order to form such grooves on the substrate of an information recording medium disk, means known in the disk manufacturing technology can be applied to transfer the grooves onto the substrate using a stamper.

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. A laser beam in a non-modulated state forms a recording trace of an information signal on the recording layer, and also applies a non-modulated laser to land portions between adjacent recording traces of the information signal in the recording layer of the information recording medium disc. Information signals are recorded using an information signal recording method in which a second light spot 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 for the recording area RD,
The first recorded area P provided in the inner part adjacent to
The first laser beam projected onto GD. The first light spot among the second light spots is moved to the first recorded area PGD by the operation of the tracking control system while maintaining a predetermined accurate recording trace interval by changing the geometrical shape. "Record traces in a pre-recorded trace pattern"
The address signal Sa recorded in the recording trace is reproduced while correctly tracing the second laser beam, and the second light spot of the laser beam is moved to the first recorded area PGD by the operation of the tracking control system. On the other hand, by changing the geometrical shape, the land between two traces in a prerecorded trace pattern is correctly traced while maintaining a predetermined accurate trace interval.

Then, as described above, the second light spot of the laser beam projected onto the land portion in the first recorded area PGD is used to detect the tracking error information, and the detected tracking error The operation of the tracking control system based on the information causes the first .
The spot of the second light is tracked and controlled. The first laser beam described above. Displacement drive of the second light spot.

This is performed by displacement-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 first 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 disc, and the first and second light spots of the laser light are The light spot is moved in a short period of time to the final recording trace among the recording traces formed in the first recorded area PGD.

The first light spot of the laser beam is the first recorded area PGD.
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.
GT) is rapidly displaced from the end of the last record trace formed in the record track GT) to the end portion of the record trace one record interval before. 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. 4 is a side view of a part of the mechanical part of the recording device, and in this FIG. 4, 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. 4, 5 is a condenser lens, 6 is an actuator unit, 7 is an optical system unit, 8 is a rail that guides the optical system unit 7 when it is transferred in the radial direction of the information recording medium disc, 9.10 is a support for the rail 8 described above.

In FIG. 4, F is a transfer mechanism for the optical system unit 7, and in the illustrated example, the transfer mechanism F is composed of a transfer motor 11, spur gears 12 to 17, a pinion 18, and a rack 19. The rotational force of the transfer motor 11 is reduced in speed by spur gears 12 to 17 and transmitted to the pinion 18 meshing with the rack 19 fixed to the optical system unit 7, so that the optical The system unit 7 is transported along the rail 8.

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

Next, FIG. 5 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, 25.31 is a polarizing prism, 26.28 is 1
74 wavelength plate% 27, 33 is a dichroic mirror, 29
is a detection system for focus error and tracking error signals,
30 is a focus control and tracking control system, 6 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. 5, the first semiconductor laser 21 thereof is intensity-modulated by the information signal to be recorded after the recording device starts the recording operation of the information signal. For example, it emits a laser beam with a wavelength of 780 nm, and when the recording device is in recording standby mode, it emits an address signal Sa recorded in each recording trace of the first recorded area PGD on the information recording medium disk. The wavelength of constant light intensity for reproduction is 780
Emit laser light of nm.

The laser beam emitted from the first semiconductor laser 21 described above follows an optical path of collimating lens 23 → polarizing prism 31 → polarizing prism 25 → quarter wavelength plate 28 → condensing lens 5 → recording layer of information recording medium disc. A first light spot S1 is imaged on the recording layer of the information recording medium disc through the information recording medium, but the first light spot S1 is is used for recording information signals on the recording layer of the recording information recording medium disk, and when the recording apparatus is in the recording standby mode, the first light spot S is
1 is used as a light spot for reproducing the address signal in the recording trace in the first recorded area.

The reflected light from the first light spot S1 is transmitted through the condensing lens 5→1/4 wavelength plate 28→polarizing prism 25→1/4 wavelength plate 28→polarizing prism 25→1/4 wavelength plate 28
The light is supplied to the signal detection system 32 by following the optical path of the four-wave plate 26 → the dichroic mirror 33 that transmits light with wavelengths of 780 nm and 780 nm and reflects light with a wavelength of 830 nm, and the recording device performs an information signal recording operation. After the start of the process, the signal detection system sends a monitoring signal, and
When the recording device is in the recording standby mode, the signal detection system 32 outputs a reproduction signal of the address signal Sa in the recording trace in the first recorded area to signal processing of the address signal in the recording device. Send it to the system.

In the optical system unit 7 shown in FIG. 5, the second semiconductor laser 22 is a semiconductor laser used as a semiconductor laser that emits unmodulated laser light, and the 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 wavelength of 830 nm and a constant intensity emitted from the second semiconductor laser 22 described above is transmitted through the collimating lens 24 → polarizing prism 25 → 1/4 wavelength plate 26 → the wavelength is 7
Dichroic mirror 33 that transmits light with a wavelength of 80 nm and reflects light with a wavelength of 830 nm→1/4 wavelength plate 26→polarizing prism 25→1. /4 wavelength plate 28 → condenser lens 5 →
The second light spot S2 is imaged on the recording layer of the information recording medium disc through the optical path of the disc, but this second light spot S2 does not change after the recording device starts the recording operation. The above-mentioned first in the recording layer of the information recording medium disc
A state of uniformly high reflectance is achieved by irradiating the lands between adjacent recording traces of the information signals recorded by the light spot S1 with the above-mentioned laser beam of a constant light intensity. Make it. The second light spot S2 of the laser light for the land and the first light spot S1 described above have approximately the same energy density.

Further, the reflected light from the second light spot S2 described above is transmitted from the condenser lens 5 to the quarter wavelength plate 28 to the polarizing prism 25.
After passing through the optical path →polarizing prism 31→, the light enters the focus error and tracking error signal detection system 29. In the focus error and tracking error signal detection system 29, a spot S2 of the second light incident thereon is detected.
A tracking error signal is generated by, for example, a push-pull method using the reflected light from the object, and a focus error signal is generated by, for example, an astigmatism method, and the generated tracking error signal and focus error signal are used for focus control. and a tracking control system 30, and the focus control and tracking control system 30 supplies a drive signal to an actuator unit to drive and displace the condensing lens 5. ．． Second light spot S1. , S2 are always in focus, and the sequential recording traces formed by the first light spot S1 are recorded on the recording layer while maintaining a predetermined interval between recording traces.

FIG. 6 is a block diagram showing an example configuration of a recording device for an information recording medium disc according to the present invention, and in the block diagram shown in FIG. 6, the recording device shown in FIG. Components corresponding to each component of the apparatus are given the same drawing symbols as those used in FIG. 4.

Further, in FIG. 6, 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, SAC is a signal processing circuit, ASEP is an address signal separation circuit, oPCC is a control circuit, OP is an operation unit,
wpc is a waveform shaping circuit, MIX is a mixing circuit, TSG is a tracking control circuit, FSC is a focus control circuit, O
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 semiconductor lasers 21 and 2 provided in the optical system unit 7 are controlled by control signals given from the control circuit OPCC to the laser drive amplifiers LDAI and LDA2.
2, the semiconductor lasers 21 and 22 emit laser light, and the first . Second light spot S1. S 2 is projected onto the first recorded area P GD on the information recording medium disc.

The first laser beam described above. The first light spot Sl among the second light spots Sl 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 recorded trace pattern recorded while maintaining the recorded trace interval, and an elliptical optical system unit as described above with reference to FIG. 5 is used as the optical system unit 7. In this case, the laser beam for land irradiation having a constant intensity and a wavelength of 830 m, for example, emitted from the second semiconductor laser 22 in FIG. 1/4 wavelength plate 26 → dichroic mirror 33 that transmits light with a wavelength of 780 nm and reflects light with a wavelength of 830 nm → 1/4 wavelength plate 26 → polarizing prism 2
A second light spot S2 is formed on the recording layer of the information recording medium disc through the optical path of 5 → 1/4 wavelength plate 28 → condensing lens 5 →
The reflected light from the second light spot S2 of the laser beam for the land passed through the optical path of the condenser lens 5 → quarter wavelength plate 28 → polarizing prism 25 → polarizing prism 31 → Afterwards, it enters a detection system 29 for focus error and tracking error signals.

Focus error and tracking error signal detection system 29
Now, using the reflected light from the spot S2 of the second light incident thereon, a tracking error signal is generated by, for example, a push-pull method, and a focus error signal is generated by, for example, an astigmatism method. supplying the tracking error signal and the focus error signal 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 control the condenser lens 5.
The first image is projected onto the recording layer of the information recording medium disk. The second light spots SL and S2 are always in focus, and the first light spot S1 is fixed to the first recorded area PGD on the information recording medium disk by changing the geometric shape. The recording trace pattern recorded in advance is correctly traced while maintaining accurate recording trace intervals, and the second light spot S2 of the laser beam is controlled by the operation of the tracking control system. , Correctly move on the land between two traces in the trace pattern recorded in advance while maintaining a predetermined accurate trace interval by changing the geometric shape with respect to the first recorded area PGD. It is done so that it can be followed.

In the block diagram shown in FIG. 6, the arithmetic function of the focus error and tracking error signal detection system 29 block shown in the optical system unit 7 shown in FIG. 5 is independently shown as a block oPC. Furthermore, 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. It is shown independently as a block of the tracking control circuit TSC.

Figure 3 shows that due to the operation of the tracking control system described above,
The first light spot 81 of the laser beam correctly traces the recording trace in the recording trace pattern recorded in advance in the first recorded area PGD, and the second light spot S2 of the laser beam correctly traces the recording trace in the recording trace pattern recorded in advance in the first recorded area PGD. FIG. 3 is a partially enlarged plan view showing a state in which a land between two traces in a trace pattern recorded in advance in a finished area PGD is correctly traced;

Now, as described above, the information recording medium disc used for recording information signals in the present invention has a first recorded area PGD.
A predetermined address signal Sa is preset in the vicinity of a specific radius on the information recording medium disc among all the records recorded while maintaining a predetermined accurate record trace interval by changing the geometric shape. Since it is recorded,
As is clear from FIG. 3, when the recording device is in the recording standby mode, the address signal Sa recorded in each of the recording traces is read out by the first light spot S1 of the laser beam. be done.

Therefore, by using the address signal in the reflected light from the first light spot S1 of the laser beam, a predetermined accurate recording is performed by changing the geometrical shape in the first recorded area POD on the information recording medium disc. It is possible to know the address of each recorded trace while maintaining the trace interval.

Now, as mentioned above, the focus information and tracking error detected by the second light spot S2 of the laser light projected onto the land between the recording marks in the first recorded area PGD of the information recording medium disk. Information is arithmetic circuit O
The tracking error signal, which is converted into a focus error signal and a tracking error signal in the PC and output from the arithmetic circuit OPC, is supplied to the tracking control circuit TSC.
Further, the focus error signal output from the arithmetic circuit OPC described above is supplied to the 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 @ path MIX, and is also supplied to the focus control port M described above.
The focus control signal generated by the FSC is supplied to the actuator unit 6. As a result, the first laser beam. The second light spots Sl and S2 are subjected to focus control and tracking control.

Further, the address signal Sa and other signals read by the first light spot S1 of the laser light are sent to the amplifier AM.
After being amplified by P, the signal is supplied to the address signal separation port MASEP and the signal processing circuit SAC, 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 opcc uses the address indicated by the address signal Sa supplied thereto and the first recorded area PG.
By comparing the address of the last recorded trace in D, the first .D of the laser beam is compared. How far in advance are the addresses at which the second light spots S1 and S2 are located relative to the address of the last recorded trace in the recorded trace pattern recorded in advance in the first recorded area POD? is calculated, a necessary kick pulse is generated based on the result, and it is supplied to the mixing circuit MIX.

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 spots S1 and S2 are made to rapidly approach the final trace in the trace pattern recorded in advance in the first recorded area PGD.

Then, the control circuit opcc outputs the first laser beam according to the address signal supplied thereto. Decreasing the number of kick pulses as the position of the second light spots SL, S2 approaches the final recording trace in the recording trace pattern previously recorded in the first recorded area PGD,
The first and second laser beam spots SL and S2 are the first and second beam spots SL and S2, respectively.
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.

In the control circuit 0PCC, the recording device is ¥i! When in recording standby mode, the first . Second light spot St
, 82 reaches the end of the final recording trace in the recording trace pattern previously recorded in the first recorded area PGD, the control circuit OPCC transmits the first laser beam to the mixing circuit MIX. ．． A kick pulse is applied to drive the second light spot Sl, 82 from the end of the last recorded trace in the recorded trace pattern previously recorded in the first recorded area PGD to the end of the previous recorded trace. supply

By supplying the kick pulse described above to the actuator, the first . The second light spot starts from the end of the last recording trace in the recording trace whose first light spot is formed in the first recorded area POD.
■It is rapidly displaced to the end of the record trace that is the previous record 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 OD is being repeatedly traced, the control circuit ○PCC stops supplying the above-mentioned kick pulse, Thereby, the recording trace formed by the first light spot S1 of the laser beam whose intensity is modulated by the information signal targeted for recording is created in advance in the first recorded area PGD. The recording traces that are continuous to the end portion of the recording trace pattern and always separated by a predetermined recording trace interval TP are formed on the recording layer by the first light spot S1 of the laser beam with a predetermined light intensity. As records are formed, the land portions are also brought into a state of high reflectance by the second light spot S2 of the laser beam.

Recording traces that are sequentially recorded 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. It goes without saying that the interval is always the predetermined trace interval TP.

In other words, the recording traces that are sequentially formed on the recording layer of the information recording medium disk by the first beam of laser light whose intensity is modulated by the information signal to be recorded are as follows: , due to the information signals recorded on it, areas with high light reflectance and areas with low light reflectance are arranged alternately in sequence, so that the average light reflectance of the recorded trace is is lower than the light reflectance at the land portion, so the second laser beam spot S2 has been recorded and formed by the aforementioned first laser beam spot S1. By projecting the laser beam between the two recording traces, tracking error information can be obtained by the reflected light from the recording layer of the information recording medium disk by the second light spot S2 of the laser beam. As a result, the first laser beam. Second light spot 81. Tracking control is performed on S2, and the recording traces that are sequentially recorded and formed by the first light spot S1 of the laser beam whose intensity is modulated by the information signal targeted for recording are pre-recorded in the area PGD. This is because the recording traces are always made at the predetermined interval TP by following the records formed at the predetermined interval TP in the provided record trace pattern.

(Effects) As is clear from the above detailed explanation, the information recording medium disk of the present invention allows information to be recorded by the first light spot of the laser beam whose intensity is modulated by the information signal to be recorded. In addition to forming a recording trace by an information signal on the recording layer of the information recording medium disc, there is also no modulation of the land portion between adjacent recording traces of the recording trace by the information signal in the recording layer of the information recording medium disc. An information recording medium disc 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 a state of , above-mentioned No. 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 A record trace pattern with a predetermined accurate record trace interval maintained in a region having a width larger than that is formed in advance by changing the geometric shape,
In addition, each record trace in the record trace pattern has a predetermined address signal recorded in advance around a specific radius on the information recording medium disc, and furthermore, the record trace pattern has a change in geometric shape. In the information recording medium disk of the present invention, a signal indicating the reference rotational phase of the information recording medium disk is prerecorded in an area adjacent to the inner side of the area recorded as . In the information recording medium disk of the present invention, in the standby mode of the recording operation performed prior to the start of the recording operation of the information signal on the information recording medium disk, recording is performed on the first light spot of the laser beam described above. A second light spot of a laser beam is provided in advance in the first recorded area P G D to be projected at a position 172 of the recorded trace interval TP in the width direction of the traces. The second light spot S2 is set so that it is located between two adjacent recording traces in the recording trace.
A tracking control operation is performed using the reflected light from 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 light reflected from the recording layer of the information recording medium disk by the second spot of the laser beam is used to determine the first spot of the laser beam. Second
Tracking control is performed for 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 PGD.
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, a predetermined address signal is recorded in advance in each recording trace in the first recorded area PGD of the information recording medium disk near a specific radius of the information recording medium disk, and the address signal is read by the first light spot of the laser beam, and the read address signal is used as 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. The address of each recorded trace is determined by extracting it, and the first recorded area P G D on the information recording medium disc is determined accordingly.
The information recording medium which is recorded in the second recorded area SPD of the information recording medium disc by rapidly moving the spot of the laser beam to the final recording trace of the recording trace pattern in An information recording medium that uses a kick pulse generated based on a signal indicating a reference rotational phase of the disk to direct the first light spot of the laser beam while the recording device is in a recording standby state. Since the last recorded trace of the recorded trace pattern in the first recorded area PGD on the disk can be repeatedly traced, the first recorded area PG previously recorded on the information recording medium disk can be traced repeatedly.
The width of D is widened, and the first laser beam is emitted at the start of the recording operation. The second light spot is always in the first recorded area PGD.
Even if the recording device is projected onto a recording trace in a short time, 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 apparatus, and the above-mentioned conventional problems can be satisfactorily solved according to the present invention.

[Brief explanation of drawings]

FIG. 1 is a plan view of an example of the configuration of an information recording medium disk according to the present invention, and FIGS. 2 and 3 illustrate the manner in which information signals are recorded on the information recording medium disk shown in FIG. FIG. 4 is an enlarged plan view of a part of the information recording medium disk according to the present invention, FIG. FIG. 6 is a side view showing a configuration example of an optical system unit used when recording information signals on the information recording medium disc of the invention, and FIG. 6 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 P G D Geometrically as a state in which a predetermined accurate recording trace interval is maintained. A predetermined address signal, Sp, which is pre-recorded in the vicinity of a specific radius of the information recording medium disc of each record trace in a record trace pattern previously formed by a change in the shape of the recording trace, Sp...second record. A signal indicating the reference rotational phase of the information recording medium disc recorded in advance in the finished area SPD, ■, DAl, , LDA2...Laser drive amplifier, M
OD...Signal modulation circuit.

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 with a predetermined accurate record trace interval is formed in advance in an area having a width larger than the size by changing the geometric shape, and each record in the record trace pattern is A predetermined address signal is prerecorded in each trace in the vicinity of a specific radius on the information recording medium disk, and furthermore, a predetermined address signal is recorded in advance in each of the traces in the vicinity of a specific radius on the information recording medium disc, and furthermore, a predetermined address signal is recorded in advance in the vicinity of a specific radius on the information recording medium disk, and furthermore, a predetermined address signal is recorded in advance in the vicinity of a specific radius on the information recording medium disk, and furthermore, a predetermined address signal is recorded in advance in the vicinity of a specific radius on the information recording medium disc, and furthermore, a predetermined address signal is recorded in advance in the vicinity of a specific radius on the information recording medium disk. The information recording medium disk has a signal indicating the reference rotational phase of the information recording medium disk recorded in advance in the area where the