JPH0991704A - Information recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve such problems incapable of coping with the case of performing high speed multivalued modulation for forming a recording mark and the case of completion of forming the recording mark and a space after passing a recording beam of light like a phase transition type optical disk. SOLUTION: This device is equipped with an optical head 17 for irradiating the same track with at least a main-beam of light and a sub-beam of light from one light source 18, photodetectors 27 and 28 for receiving individual reflected light beams from an information recording medium and a light intensity control means 16 for controlling the light source 18 with a control signal. An output signal level of the photodetector 28 corresponding to the sub-beam of light obtained at the time of recording the space by the main-beam of light is applied as one to the control signal for the light intensity control means 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing device such as an optical disk drive device.

[0002]

2. Description of the Related Art In an information recording / reproducing device such as an optical disk drive device, an information recording medium is rotated to irradiate the information recording medium with light, and the intensity of the light is changed to form a binary value composed of recording marks and spaces. Some form information or new binary information accompanied by erasing old binary information. Further, Japanese Patent Publication No. 57-60696 discloses a write-once type optical disc drive device (WOR) as an optical information recording device.
M) describes that the write power is controlled by utilizing the waveform of the reflected signal at the time of writing data.

Optical Memory Symposium '94 "CD-R and t
In “he compatibility with CD”, in the CD-R drive device, the optimum write power control is performed by observing the state of the RF signal when the write power is emitted (Ru
nningOPC) is described. The Japan Society for Applied Magnetics research material "Optical head technology for high speed and high density recording" 199
2, Vol, 73rd describes a form in which recording light and reproducing light are arranged on the same track, and a form in which two or more light beams are separated from one light source (a three-beam optical head for magneto-optical, a super-resolution optical head). Has been done. Japanese Examined Patent Publication No. 53-13123 describes a flat record carrier reading device in which a track signal is detected by a three-beam method using a phase grating (slit).

Japanese Patent Publication No. 63-25408 discloses a signal recording method in a write-once type optical disc drive apparatus, in which trial writing for determining the optimum recording power is performed before recording data. This is because the recording light source intensity is changed stepwise in the trial writing area of the information recording medium to trial write the information, then the information is reproduced from this trial writing area and the optimum recording condition is obtained from the state of the reproduced signal. After that, the data is recorded under the obtained optimum recording condition.

In addition to the recording-dedicated optical system, the same track immediately after recording is scanned by a reproduction-dedicated optical system using another light source to detect the recording state from the level of the reproduction signal.
A method of correcting the recording condition has been proposed. further,
An optimum recording light source intensity control method for a phase-change optical disk drive device using a 1-beam optical system, which reflects light (not in a recording state) from an information recording medium during erase power emission (space recording). Reflection from a medium (information recording medium) of a recording beam obtained by detecting, that is, when forming a recording space in which a light source emits light with a constant intensity for a relatively long time (corresponding to erasing in a phase change type optical disc drive device) A method has been proposed in which the intensity of a recording light source is controlled by detecting a change in light intensity due to a warp inclination of a medium at the signal level.

[0006]

In an optical disk drive device capable of recording on an information recording medium, it is optimal to correct a change in emission intensity due to deterioration of a light source with time, a dust adherence to the information recording medium or a change in sensitivity due to deterioration over time. It is necessary to record the information on the information recording medium under certain conditions. One method for obtaining this optimum condition before recording data is Japanese Patent Publication No. 63-254.
This is a trial writing known from Japanese Patent Laid-Open No. 08-08. In the currently recordable CD-type optical disk drive device (CD-R), trial writing is performed on the inner circumference of an optical disk according to the Orange Book standard, which is a substantial standard.

In the optical disk drive device of the CD system format, there is no concept of a sector as in the data system optical disk, and it is necessary to record continuous data on the optical disk. When information is recorded on an optical disc for a long time, the characteristics of the light source, optical parts, media characteristics of the optical disc, and the warp inclination of the medium at the inner circumference at the start of writing and the outer circumference at the end of writing on the optical disk due to the temperature rise inside the device The recording state changes due to various factors such as a decrease in the light intensity on the board surface due to (tilt) and the like, and the optimum recording light source intensity changes. As a countermeasure for this, the above-mentioned Orange Book standard specifies Ru.
Detecting the reflected light during recording, which is called "nningOPC",
A method of observing the generation state of recording marks and maintaining the optimum recording state is proposed in Japanese Patent Publication No. 57-60696 and Optical Memory Symposium '94.

In the magnetic field modulation type magneto-optical disk drive device, since the light source intensity is constant, it is separated from the recording light beam on the information recording medium as in the optical head technology for high speed and high density recording. By irradiating a weak read-only beam, it is possible to verify the recording state or recorded data with the reflected signal. However, in the above method, an optical disk drive device that modulates information by an optical modulation method and records the information on an optical disk, particularly PWM (Pit
Width Modulation) method and a phase change type optical disc drive device for recording on an optical disc or a high speed WORM
In order to accurately form one recording mark, the intensity of the recording light source is modulated at high speed in a multi-value manner. Therefore, the reflection signal from the medium at the time of forming the recording mark is modulated according to the intensity modulation of the recording light source. The recording state cannot be detected with such an accuracy that it can be observed accurately.

In addition, in the phase-change type optical disk drive device, in addition to that, the formation of the recording marks and spaces is not completed during the irradiation of the recording light rays on the optical disk, but the recording marks and the space are changed due to the difference in the cooling state after the irradiation of the recording light rays. Since the space is formed, it is not possible to detect the formation state of the recording mark and the space by the reflection signal from the medium of the optical disk during the formation of the recording mark and the space. Thus, since one beam is basically used (the reflected signal from the medium of the light beam used for recording is detected), when high-speed multilevel modulation is performed to form a recording mark, recording is performed like a phase-change optical disk. It cannot be used when the formation of recording marks and spaces is completed after passing the light beam.

As a simple means for solving this problem,
Separately from the recording-only optical system, the same track immediately after recording on the optical disk is scanned by a reproduction-only optical system using another light source to detect the recording state from the level of the reproduction signal,
A method of correcting the recording condition has been proposed. But,
This method requires two light sources and two light source control systems, and it is difficult to hold two light beams in the vicinity on the same track of the optical disc.

Therefore, in the above system, the level of the reflected signal from the medium of the recording light beam, which is obtained when the recording space is formed in which the recording light source emits light at a constant intensity for a relatively long time (erasing in the phase change type optical disc drive device). Detects changes in recording light intensity due to warp inclination of media. However, even though the phase change type optical disk drive device detects the recording light intensity on the surface of the medium, it does not detect the formation state of the recording mark.

According to the present invention, one light source and light beam control are performed even when high-speed multilevel modulation is performed to form a recording mark or when formation of a recording mark and a space is completed after passing a recording light beam such as a phase change type optical disk. It is an object of the present invention to provide an information recording / reproducing apparatus that can be handled by a system and can detect the formation state of recording marks and spaces to optimally control the recording light intensity.

[0013]

In order to achieve the above object, the invention according to claim 1 rotates an information recording medium to irradiate the information recording medium with light, and changes the intensity of the light for recording. In an information recording / reproducing apparatus for forming binary information consisting of marks and spaces or forming new binary information accompanied by erasing old binary information, a chief ray for forming or erasing the binary information from one light source. An optical head which irradiates onto the same track formed on the information recording medium a light beam which is located behind the principal ray in the rotation direction of the information recording medium and which is divided into at least two sub-rays having relatively weak intensity. And a photodetector for receiving and photoelectrically converting each reflected light from the information recording medium, and performing the intensity modulation of the light source necessary for forming or erasing the binary information, and the light beam is optimal. To be strong A light intensity control unit for controlling the light source by a control signal, and controlling the light intensity control unit to control the output signal level of the photodetector corresponding to the sub-light beam obtained when the space is recorded by the main light beam. It is one of the signals.

According to a second aspect of the present invention, in the information recording / reproducing apparatus according to the first aspect, the distance D between the chief ray and the sub ray on the information recording medium is set so that recording marks and spaces are formed by irradiating the chief ray. Is defined as D ≧ T × Lv depending on the recording film transition time T of the information recording medium and the rotation speed Lv of the information recording medium.

According to a third aspect of the present invention, in the information recording / reproducing apparatus according to the first aspect, the photodetector corresponding to the sub-ray obtained when recording a space having a length twice or more the minimum mark length is provided. The output signal level is one of the control signals of the light intensity control means.

The invention according to claim 4 is the invention according to claim 1 or 2.
In the information recording / reproducing apparatus as described above, a special data pattern having an error-correctable length is partially replaced and inserted into a data string of information at the time of recording, and the sub-ray obtained at the time of recording a relatively long space of the special data pattern The output signal level of the corresponding photodetector is one of the control signals of the light intensity control means.

According to a fifth aspect of the present invention, in the information recording / reproducing apparatus according to the fourth aspect, the special data pattern is formed by combining a mark and a space having a relatively short length and then combining a relatively long space. It is a thing.

The invention according to claim 6 is the invention according to claims 1, 2,
3. The information recording / reproducing apparatus according to 3, 4, or 5, further comprising averaging means for averaging the output signals of the photodetectors corresponding to the sub-rays obtained when recording the space with the chief ray. Output signal is one of the control signals of the light intensity control means.

The invention according to claim 7 is the invention according to claim 1,
The information recording / reproducing apparatus according to 3, 4, or 5, further comprising amplitude calculating means for calculating an output signal amplitude of the photodetector corresponding to the sub-ray obtained when the space is recorded by the main ray, and the amplitude is calculated. The output signal of the calculation means is one of the control signals of the light intensity control means.

The invention according to claim 8 is the invention according to claim 1,
In the information recording / reproducing apparatus described in 3, 4, 5, 6 or 7, a trial writing for calculating the optimum light intensity of the light source for recording is performed before starting the recording of data, and at the time of this trial writing, A target value is the output signal level of the photodetector corresponding to the sub-ray obtained when the space is recorded by the principal ray, and the sub-ray obtained when the space is recorded by the principal ray at the time of recording data thereafter. And means for holding the output signal level of the photodetector corresponding to the target value at the target value.

The invention according to claim 9 is the invention as defined in claims 1, 2 and
In the information recording / reproducing apparatus described in 3, 4, 5, 6 or 7, the output signal of the photodetector corresponding to the sub-light beam obtained when the space is recorded by the main light beam immediately after the data recording is started. A level is set as a target value, and means for holding the output signal level of the photodetector corresponding to the sub ray obtained when the space is recorded by the chief ray at the time of recording data at the target value thereafter. is there.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION First, an embodiment of an information recording / reproducing apparatus to which the invention described in claims 1 to 3 is applied will be described. Among the information recording / reproducing apparatuses, an optical disk drive apparatus that modulates information by optical modulation and records it on an information recording medium, and in particular, a phase change type optical disk drive apparatus that modulates information by a PWM (Pit Width Modulation) method and records it on an optical disk, In high-speed WORM, the intensity of a light source (for example, a laser diode) (recording beam intensity) is intensity-modulated into multiple values at high speed in order to accurately form one recording mark. FIG.
FIG. 3A shows an example of a recording light source intensity modulation waveform of a high speed WORM, and FIG. 3B shows an example of a recording light source intensity modulation waveform of a phase change type optical disc drive device including an erasing process. In FIG. 3, P _W , P _R , P _B , and P _E indicate levels corresponding to write power, read power, bias power, and erase power, and t indicates time. The present invention is not limited to the recording light source intensity modulation waveform having these waveforms, but can be applied to an information recording / reproducing apparatus that modulates the intensity of the recording light source into a multi-speed at high speed to form a recording mark.

Further, as a material of the information recording medium of the phase change type optical disk, AgInSbTe system is representatively mentioned. In this way, when the recording light source intensity is modulated, the reflected light from the information recording medium (media) with respect to the recording light beam is naturally also modulated at high speed, and the reflected light from the medium corresponding to the recording light beam forms a recording mark. It is not possible to detect the state (formation state of binary information composed of recording marks and spaces or formation state of new binary information accompanied by erasing old binary information).

Further, the recording mechanism of the phase-change type optical disk is such that when the recording film as an information recording medium of the optical disk is heated to a temperature higher than the melting point and rapidly cooled with a high recording light intensity, the recording film becomes amorphous and the erasing light intensity lower than the recording light intensity. When the recording film is heated to the crystallization temperature and slowly cooled, it is crystallized, and information is recorded by utilizing the fact that the reflectance is different between these two states (non-crystallized state and crystallized state). The major difference between this phase change type optical disk and the WORM write-once type optical disk is that the phase change type optical disk has a recording mark formed after passing a recording beam.

In an embodiment of an information recording / reproducing apparatus to which the invention described in claims 1 to 3 is applied, as shown in FIG. 4, the chief ray 2 for recording or erasing is formed on the information recording medium 1. Behind the light spot, a light spot by a comparatively weak sub-ray 3 dispersed from the same light source is arranged on the same track 4. As a result, the recording mark M (M1, M2, M3 ...
.) And the space S (S1, S2, S3 ...) Are completely formed, and then the recording mark M and the space S are scanned by the sub ray 3.

Further, as shown in FIG. 5, at the timing (Sample Timing) when the space S6 is recorded on the information recording medium 1 by the chief ray 2, the recording marks M4 to M4 recorded on the information recording medium 1 immediately before are recorded. M6 and spaces S4, S
The light reflected by the sub ray 3 of 5 is received by the photodetector (the sub ray 3 scans past recording marks and spaces because it is located behind the main ray 2), and is recorded from the level of its output signal. Detect the condition. Here, the information recording medium 1
Indicates that the reflectance is low at the recording mark M.

In this embodiment, as shown in FIG. 5, the sub ray 3 is arranged behind the main ray 2 by a distance of 5 times the minimum mark length on the rear side in the scanning direction, but the present invention is not limited to this. Absent. When the main ray 2 enters the Sample Timing, the sub ray 3 scans the mark M4, and thereafter, while the main ray 2 records the space S6, the sub ray 3 changes to the space S.
4, the mark M5, the space S5, and the mark M6 are sequentially scanned. Since the light source intensity, that is, the intensity of the sub ray 3 is constant, the recording state of the recording mark and the space can be detected by the sub ray 3. Further, it is more effective to use the APC method in which a part of the light source is directly led from the light source to the photodetector and the light source intensity is directly controlled so as to keep the output signal at a predetermined value.

As a means for producing the principal ray 2 and the sub ray 3 from one light source, for example, a three-beam method in which a slit is arranged in the light path used in a CD-ROM or the like for tracking or crosstalk cancellation ( There is a method using side lobes of a super resolution spot (see Japanese Patent Publication No. 53-13123) and a super-resolution spot (see the above-mentioned optical head technology for high-speed high-density recording), and a plurality of light beams are collected on the same track on an information recording medium. Adjust it so that it shines. Further, the chief ray 2 and the subsidiary ray 3 do not need to be completely separated, and the intensity of the ray is distributed with two or more peaks in the tangential direction of the track on the information recording medium, and the peaks are the main ray 2 Alternatively, the secondary ray 3 may be used.

This embodiment is also an embodiment of the information recording / reproducing apparatus to which the invention described in claim 2 is applied, and after the formation of the recording marks and spaces by the chief ray 2 is completely completed, the recording marks and spaces are removed. It is specified that the distance between the main ray 2 and the sub ray 3 is adjusted to the characteristics of the recording film so that the sub ray 3 can scan. In the phase-change type optical disk, as described above, the properties of the recording film are determined by the cooling state after passing the principal ray (whether the recording state is a crystalline state or an amorphous state). In order to check the recording state, it is necessary to scan the recording portion with the sub ray 3 after the recording film transition time T determined by the composition of the recording film has passed after the main ray has passed.

Since the medium is rotated at a predetermined linear velocity Lv, the distance D between the main ray 2 and the sub ray 3 is D in order to scan the recording mark and the space with the sub ray 3 after forming them. It is necessary to satisfy ≧ T × Lv. In WORM, since the recording film transition time T is very short, the distance D between the principal ray 2 and the subsidiary ray 3 may be small and the principal ray 2 and the subsidiary ray 3 may be arranged in the vicinity.

This embodiment is also an embodiment of the information recording / reproducing apparatus to which the invention according to claim 3 is applied.
Amplitude (signal level) of the output signal of the photodetector corresponding to the secondary ray 3 with respect to the data pattern of the combination of the minimum recording mark and the minimum space in the recording data, or the combination of the recording mark and the space of the same length. Is calculated, the output signal level of the photodetector corresponding to the sub ray 3 is used as the control signal of the light intensity control means when the space recording with the main ray 2 is twice or more the minimum mark length.

In FIG. 5, marks M1 to M7 are the shortest minimum recording marks, S1 to S5 are the shortest minimum spaces, and S6 is a long space. In the Sample Timing where the chief ray 2 records a long space S6, the mark M
4, the reflected signal from the medium of the sub ray 3 for the space S4, the mark M5, the space S5, and the mark M6 is obtained. Here, if the space S6 is a minimum, and has a length that is twice the minimum mark length, the mark M4, the space S, and
4 can be detected, and the signal level (amplitude) indicating the recording state can be calculated. This calculation is performed when the combination of recording marks and spaces is the combination of recording marks and spaces having the same length. Differences in amplitude (due to optical resolution) and differences in low frequency components (due to DSV) between recording mark lengths. This is because the signal level can be calculated without being affected by the above, and if these effects are forcibly eliminated, there is no need to limit by this data pattern.

FIG. 2 shows this embodiment, and FIG. 1 shows a part thereof. Normally, when recording information on the medium of the optical disk 11 (forming binary information consisting of recording marks and spaces or forming new binary information accompanied by erasing old binary information), the CPU 12 and the memory 13 record the information. Data to be created is created, and the ECC unit 14 adds an error correction code to this data. The data from the ECC unit 14 is (1, 7) RLL, (2, 7) RLL, EFM, EFM +, VFM, NEM in the ENC unit 15 as a modulation means.
The optical head is modulated according to a modulation rule, such as the multi-level intensity modulation means, and the light intensity control means 16 constituting the multi-level intensity modulation means performs multi-level intensity modulation suitable for recording binary information on a medium to form recording data, which becomes an optical head. Reference numeral 17 records binary information consisting of recording marks and spaces on the medium by the recording data (forms binary information consisting of recording marks and spaces or forms new binary information accompanied by erasing old binary information). .

The optical head 17 includes a light source 18, a slit member 19 having a slit, a collimator lens 20, beam splitters 21 and 22, an objective lens 23, and a condenser lens 2.
4, 25, and photodetectors 26 to 28, and the beam splitter 21, the condenser lens 24, and the photodetector 26 constitute photodetection means for directly detecting the light from the light source 18.
Further, the beam splitter 22, the condenser lens 25, and the photodetectors 27 and 28 constitute a photodetecting means for detecting the reflected light from the optical disc 11, and the optical disc 11 is rotationally driven by a spindle motor.

The light source 18 emits light whose intensity is modulated by the light intensity control means 16 in accordance with the recording data, and the light from the light source 18 passes through the slit of the slit member 19 and the collimating lens 20, whereby the main ray and the sub ray are emitted. Is split into. These chief rays and sub rays are beam splitters 21 and 22.
By passing through the objective lens 23 and focused on the medium surface of the optical disc 11 as a main ray and two sub-rays, binary information including a record mark and a space is recorded (a record mark and a space 2). (Formation of new binary information accompanied by formation of value information or deletion of old binary information is performed).

The light spots B and C by the two sub-rays on the medium surface of the optical disc 11 are tangential to the same spot on the medium surface of the optical disc 11 with respect to the light spot A by the principal ray on the medium surface of the optical disc 11. The light spots B are arranged in the front and rear by the distance D, and the light spot B is arranged behind the light spot A on the same track in the scanning direction (rotational direction).

The reflected light from the light spots A and B on the surface of the optical disk 11 of the optical disk 11 passes through the objective lens 23, the beam splitter 22 and the condenser lens 25, and the photodetector 27,
Output signals of the photodetector 27, which are separately received and photoelectrically converted by 28 and receive the reflected light from the light spot A, are subjected to waveform shaping and binarization in the RF unit 29 and become a reproduction signal. This reproduction signal is demodulated by the DEC unit 30 as a demodulation unit, error correction is performed by the ECC unit 14, and the information recorded on the medium is reproduced.

The output signal of the photodetector 28 that receives the reflected light from the light spot B is sent to the amplitude calculating means 31, and the amplitude calculating means 31 detects the signal level (amplitude) of the output signal of the photodetector 28. Thus, the recording state of the medium of the optical disc 11, that is, the formation state of the recording mark and the space is detected. The amplitude calculating means 31 uses, for example, a sample hold circuit, and updates the signal level (amplitude) of the output signal of the photodetector 28 at the above Sample Timing and holds it at other times. The output signal of the amplitude calculation means 31 is sent to the light intensity control means 16 as one of the control signals, and the light intensity control means 16 records the light emission intensity of the light source 18 by the output signal of the amplitude calculation means 31 to optimize the light intensity. Control is performed to optimize the recording conditions.

Further, the light from the collimator lens 20 is divided into two by passing a part and being reflected by a beam splitter 21 as a light splitting means, and the reflected light from the beam splitter 21 is a condensing lens. The light is received by the photodetector 26 through 24, and the intensity is detected. The beam splitter 21, the condenser lens 24, the photodetector 26, and the light intensity control means 16 constitute APC means, and the light intensity control means 16 receives the output signal of the photodetector 26 as one of the control signals and outputs light. The emission intensity of the light source 18 is controlled so that the output signal of the detector 26 is kept at a predetermined value.

As described above, this embodiment is characterized by claim 1.
In the embodiment of the described invention, the optical disc 11 is rotated to irradiate the information recording medium of the optical disc 11 with light, and the intensity of this light is changed to form binary information composed of recording marks and spaces. In an information recording / reproducing apparatus for forming new binary information accompanied by erasing old binary information, 1
A main light ray 2 for forming or erasing binary information from one light source 18 and a light ray divided into at least two sub-light rays which are located behind the main light ray 2 in the rotation direction of the information recording medium and have relatively weak intensity. An optical head 17 that irradiates the same track formed on an information recording medium, a photodetector 28 that receives and photoelectrically converts each reflected light from the information recording medium, and forms or erases binary information. Intensity modulation of the light source 18 necessary for the light source 18 is performed so that the light beam has an optimum intensity.
And a light intensity control means 16 for controlling the output signal level of the photodetector 28 corresponding to the sub ray 3 obtained when the space is recorded with the main ray 2 by the control signal of the light intensity control means 16. Therefore, it is possible to cope with the case where high-speed multi-level modulation is performed to form the recording mark, and it is possible to detect the formation state of the recording mark and the space and record the information with the optimum recording light intensity. In addition, by dividing a light beam from one light source into at least a principal ray and a sub ray, even when the formation of the recording mark and the space is completed after passing the recording ray like a phase change type optical disc, one light source and A light beam control system can be used, and the recording light intensity can be optimally controlled by detecting the formation state of recording marks and spaces.
Information can be recorded under optimum recording conditions.

Further, this embodiment is an embodiment of the invention described in claim 2, and in the information recording / reproducing apparatus described in claim 1, the chief ray 2 and the sub ray 3 on the information recording medium.
Is the distance D of the recording film transition time T of the information recording medium in which the formation of recording marks and spaces by irradiation of the chief ray 2 is completed.
Since D ≧ T × Lv is defined by the rotational speed Lv of the information recording medium, the recording state can be detected by the sub ray after the formation of the recording mark and the space is completed after the main ray has passed, and especially the phase change. This is effective when the recording mark is not formed during the irradiation of the recording light beam, such as the mold recording method.

Further, this embodiment is an embodiment of the invention according to claim 3, and in the information recording / reproducing apparatus according to claim 1, recording of a space having a length of at least twice the minimum mark length. Photodetector 2 corresponding to sub-ray 3 obtained at times
Since the output signal level of 8 is one of the control signals of the light intensity control means 16, from the output signal of the photodetector 28 corresponding to the sub-ray 3 when the data of the combination of the minimum recording mark and space is recorded. It is possible to detect a signal level (amplitude) to detect an accurate recording state.

Further, this embodiment is an embodiment of the invention described in claim 7, and in the information recording / reproducing apparatus according to claim 1, 2 or 3, when the space is recorded by the chief ray 2. Photodetector 28 corresponding to the obtained secondary ray 3
Since the output signal of the amplitude calculation means 31 is used as one of the control signals of the light intensity control means 16, the expansion / contraction of the recording marks and spaces and the degree of writing are immediately determined. Record status can be detected,
The recording light intensity can be optimally controlled.

FIG. 6 shows an embodiment of an information recording / reproducing apparatus to which the invention described in claim 4 is applied. In this embodiment, a special data generator 32 is provided between the ENC section 15 and the light intensity control means 16 in the above embodiment. The special data generator 32 uses the ENC unit 1 during recording.
A part of the modulated data from 5 is replaced and inserted with a special data pattern having an error-correctable length, that is, the ECC unit 14 has a length that can completely reproduce the original data to be recorded, and , A part of the modulated data from the ENC section 15 is replaced and inserted into a data pattern in which the recording state can be easily detected when the recorded section by the main ray 2 of the optical disc 11 is scanned by the sub ray 3, and the data pattern is sent to the light intensity control means 16. Output.

The amplitude calculating means 31 is used for recording a relatively long space S6 of the special data pattern by the chief ray 2 (Sa
By detecting the signal level (amplitude) of the output signal of the photodetector 28 corresponding to the secondary ray 3 obtained at mple Timing), the recording state of the medium of the optical disc 11, that is,
The formation state of recording marks and spaces is detected, and the output signal is output to the light intensity control means 16 as a control signal.

In the embodiment of the invention described in claim 4, in the information recording / reproducing apparatus according to claim 1 or 2, a part of the special data pattern having an error-correctable length is replaced with a data string of information at the time of recording. Since the output signal level of the photodetector 28 corresponding to the sub-ray 3 obtained when the special data pattern is inserted and recorded in a relatively long space is set as one of the control signals of the light intensity control means 16, it is different for each information. Instead of detecting the recording state that tends to become unstable with random binary data that is unpredictable,
It is possible to accurately detect the recording state with the same recording data (special data pattern) every time. Since the special data pattern has a length capable of error correction, information can be accurately reproduced when reproduced by the sub-ray 3. In addition, by including data that is not in the original data modulation pattern or length (3T to 11T in the case of EFM modulation), there is an advantage that the location of recording state detection can be easily specified.

An embodiment of an information recording / reproducing apparatus to which the invention of claim 5 is applied is the embodiment of the invention of claim 4 in which the special data generator 32 is set to E when recording.
A part of the modulation data from the NC unit 15 is replaced and inserted into a special data pattern 33 having an error-correctable length as shown in FIG. This special data pattern 33 has a repetition 34 of short marks and short spaces.
It is divided into a long space 35. The repetition 34 of the short mark and the short space is preferably the smallest mark and the smallest space existing in the regular data pattern. Further, the long space 35 may have a length that does not exist in the regular data. The special data pattern 33 has an identification pattern 36 at the beginning in FIG. 7, but by inserting a specific pattern as an identifier for detecting the recording state, the amplitude calculating means 31 can easily determine the timing for performing the recording state detection. Can be found.

According to the fifth embodiment of the present invention, in the information recording / reproducing apparatus according to the fourth aspect, a special data pattern is combined with a mark having a relatively short length and a space having a relatively long space after repeating the space. Therefore, when the chief ray 2 is recording a relatively long space, the photodetector 28 for the repetition of the relatively short mark and space recorded immediately before by the sub ray 3 located behind the main ray 2. The amplitude of the output signal can be calculated, and the recording state can be detected more accurately.

FIG. 8 shows a part of an embodiment of an information recording / reproducing apparatus to which the invention according to claim 6 is applied. This embodiment is the same as the embodiment of the information recording / reproducing apparatus to which the invention described in claims 1 to 3 is applied.
Instead of 1, the averaging means 37 is used. The averaging means 37 detects and averages the output signal of the photodetector 28 corresponding to the sub ray 3 obtained at the time of recording the relatively long space S6 (Sample Timing) by the principal ray 2, thereby averaging the optical disc 11. The recording state of the medium, that is, the formation state of recording marks and spaces is detected, and the output signal is output to the light intensity control means 16 as a control signal. The light intensity control means 16 is the average means 3
The output signal of 7 controls the light emission intensity of the light source 18 so that the recording light intensity is optimized and the recording conditions are optimized.

Another embodiment of the information recording / reproducing apparatus to which the invention according to claim 6 is applied is the same as the embodiment of the information recording / reproducing apparatus to which the invention according to claim 4 is applied, instead of the amplitude calculating means 31. The averaging means 37 is used. Another embodiment of the information recording / reproducing apparatus to which the invention according to claim 6 is applied is the above-mentioned claim 5.
In the embodiment of the information recording / reproducing apparatus to which the described invention is applied, the averaging means 37 is used instead of the amplitude calculating means 31.
Is used.

As described above, according to the embodiment of the invention described in claim 6, in the information recording / reproducing apparatus according to claim 1, 2, 3, 4 or 5, it is obtained when the space S6 is recorded by the chief ray 2. The averaging means 37 for averaging the output signals of the photodetector 28 corresponding to the sub-rays 3 to be generated is provided, and the output signal of the averaging means 37 is one of the control signals of the light intensity control means 16, so that a simple circuit configuration is provided. Thus, it is possible to detect the expansion or contraction of the recording mark or the space due to the intensity of the recording light beam, the recording light beam intensity can be optimally controlled, and the information can be recorded in the optimal recording state.

In an embodiment of the information recording / reproducing apparatus to which the invention described in claim 8 is applied, data recording is performed in the embodiment of the information recording / reproducing apparatus to which the invention described in claims 1 to 3 is applied. The best light source 18 for recording before starting
Make a trial write to calculate the light intensity of. At the time of this trial writing, the information created by the CPU 12 and the memory 13 is trial written on the medium of the optical disk 11 by the main ray 2 and the information is reproduced by the sub ray 3 as in the case of recording data.

The light intensity control means 16 outputs the output signal level of the photodetector 28 (corresponding to the amplitude calculation means 31) corresponding to the sub-light ray 3 obtained when the comparatively long space S6 is recorded by the main light ray 2 during the trial writing. Output signal) as a target value, and the output signal level of the photodetector 28 (the output signal of the amplitude calculating means 31) corresponding to the sub ray 3 obtained when the space S6 is recorded by the principal ray 2 during the subsequent data recording. The emission intensity of the light source 18 is adjusted so as to maintain the target value.

In another embodiment of the information recording / reproducing apparatus to which the invention of claim 8 is applied, data recording is started in the embodiment of the information recording / reproducing apparatus to which the invention of claim 4 is applied. Before that, a trial writing for calculating the light intensity of the light source 18 most suitable for recording is performed. At the time of this trial writing, as in the case of recording data, the CPU 12 and the memory 1
The information created by 3 is the optical beam 11 by the chief ray 2.
Is written on the media of No. 3, and the information is reproduced by the sub ray 3. At this time, the special data generator 32 is
The modulated data from the section 15 is replaced with a special data pattern, and this special data pattern is made equal to the special data pattern used for detecting the recording state during the subsequent data recording.

The light intensity control means 16 outputs the output signal level of the photodetector 28 (corresponding to the amplitude calculating means 31) corresponding to the sub-light ray 3 obtained when the comparatively long space S6 is recorded by the main light ray 2 in the trial writing. Output signal) as a target value, and the output signal level of the photodetector 28 (the output signal of the amplitude calculating means 31) corresponding to the sub ray 3 obtained when the space S6 is recorded by the principal ray 2 during the subsequent data recording. The emission intensity of the light source 18 is adjusted so as to maintain the target value.

In another embodiment of the information recording / reproducing apparatus to which the invention of claim 8 is applied, data recording is started in the embodiment of the information recording / reproducing apparatus to which the invention of claim 5 is applied. Before that, a trial writing for calculating the light intensity of the light source 18 most suitable for recording is performed. At the time of this trial writing, as in the case of recording data, the CPU 12 and the memory 1
The information created by 3 is the optical beam 11 by the chief ray 2.
Is written on the media of No. 3, and the information is reproduced by the sub ray 3. At this time, the special data generator 32 is
The modulated data from the section 15 is replaced with a special data pattern, and this special data pattern is made equal to the special data pattern used for detecting the recording state during the subsequent data recording.

The light intensity control means 16 outputs the output signal level of the photodetector 28 (corresponding to the amplitude calculating means 31 of the amplitude calculation means 31) corresponding to the sub-light ray 3 obtained when the comparatively long space S6 is recorded by the main light ray 2 during the trial writing. Output signal) as a target value, and the output signal level of the photodetector 28 (the output signal of the amplitude calculating means 31) corresponding to the sub ray 3 obtained when the space S6 is recorded by the principal ray 2 during the subsequent data recording. The emission intensity of the light source 18 is adjusted so as to maintain the target value.

In another embodiment of the information recording / reproducing apparatus to which the invention described in claim 8 is applied, data recording is started in the embodiment of the information recording / reproducing apparatus to which the invention described in claim 6 is applied. Before that, a trial writing for calculating the light intensity of the light source 18 most suitable for recording is performed. At the time of this trial writing, as in the case of recording data, the CPU 12 and the memory 1
The information created by 3 is the optical beam 11 by the chief ray 2.
Is written on the media of No. 3, and the information is reproduced by the sub ray 3. At this time, the special data generator 32 is
The modulated data from the section 15 is replaced with a special data pattern, and this special data pattern is made equal to the special data pattern used for detecting the recording state during the subsequent data recording.

The light intensity control means 16 outputs the signal level of the photodetector 28 (the output of the averaging means 37) corresponding to the sub-light ray 3 obtained when the comparatively long space S6 is recorded by the main light ray 2 during the trial writing. Signal) as a target value, and the output signal level of the photodetector 28 (the output signal of the averaging means 37) corresponding to the sub-ray 3 obtained when the space S6 is recorded by the main ray 2 during the subsequent data recording. The emission intensity of the light source 18 is adjusted so as to maintain the value.

As described above, in the embodiment of the invention described in claim 8, in the information recording / reproducing apparatus according to claim 1, 2, 3, 4, 5, 6 or 7, before starting the recording of data. A trial writing for calculating the light intensity of the light source most suitable for recording is performed, and the photodetector 28 corresponding to the sub ray 3 obtained when the space is recorded by the principal ray 2 at the time of this trial writing.
The target value is the output signal level of the sub-ray 3 which is obtained when the space is recorded by the main ray 2 at the time of recording the data.
Since the means 16 for holding the output signal level of the photodetector 28 corresponding to 1) at the target value is provided, the recording light beam intensity can be controlled so as to hold the optimum recording condition obtained by the trial writing.

In one embodiment of the information recording / reproducing apparatus to which the invention described in claim 9 is applied, the light intensity control is performed in the embodiment of the information recording / reproducing apparatus to which the invention described in claims 1 to 3 is applied. When the means 16 records the space S6 with the chief ray 2 immediately after the recording of the data is started (Sample T
The output signal level of the photodetector 28 (the output signal of the amplitude calculating means 31) corresponding to the sub-ray 3 obtained in (iming) is set as a target value, and is obtained when the space is recorded by the main ray 2 during the recording of data thereafter. Photodetector 28 corresponding to secondary ray 3
Light source 1 so that the output signal level of
The emission intensity of No. 8 is adjusted.

According to another embodiment of the information recording / reproducing apparatus to which the invention described in claim 9 is applied, the light intensity control means 16 is the same as that of the embodiment of the information recording / reproducing apparatus to which the invention described in claim 4 is applied. , When recording the space S6 with the chief ray 2 immediately after the data recording is started (Sample Timin
The output signal level of the photodetector 28 (the output signal of the amplitude calculating means 31) corresponding to the sub ray 3 obtained in g) is set as a target value, and is obtained when the space is recorded by the main ray 2 at the time of recording data thereafter. The emission intensity of the light source 18 is adjusted so that the output signal level of the photodetector 28 corresponding to the sub ray 3 is maintained at the target value.

In another embodiment of the information recording / reproducing apparatus to which the invention according to claim 9 is applied, the light intensity control means 16 in the embodiment of the information recording / reproducing apparatus to which the invention according to claim 5 is applied is , When recording the space S6 with the chief ray 2 immediately after the data recording is started (Sample Timin
The output signal level of the photodetector 28 (the output signal of the amplitude calculating means 31) corresponding to the sub ray 3 obtained in g) is set as a target value, and is obtained when the space is recorded by the main ray 2 at the time of recording data thereafter. The emission intensity of the light source 18 is adjusted so that the output signal level of the photodetector 28 corresponding to the sub ray 3 is maintained at the target value.

In another embodiment of the information recording / reproducing apparatus to which the invention according to claim 9 is applied, the light intensity control means 16 in the embodiment of the information recording / reproducing apparatus to which the invention according to claim 6 is applied is , When recording the space S6 with the chief ray 2 immediately after the data recording is started (Sample Timin
The output signal level of the photodetector 28 (the output signal of the amplitude calculating means 31) corresponding to the sub ray 3 obtained in g) is set as a target value, and is obtained when the space is recorded by the main ray 2 at the time of recording data thereafter. The emission intensity of the light source 18 is adjusted so that the output signal level of the photodetector 28 corresponding to the sub ray 3 is maintained at the target value.

As described above, in the embodiment of the invention described in claim 9, in the information recording / reproducing apparatus described in claim 1, 2, 3, 4, 5, 6 or 7, immediately after the start of data recording. A target value is the output signal level of the photodetector 28 corresponding to the sub ray 3 obtained when the space is recorded by the main ray 2, and the sub ray obtained when the space is recorded by the main ray 2 at the time of recording data thereafter. Photodetector 28 corresponding to 3
Since the means 16 for holding the output signal level of the device at the target value is provided, the recording state changes due to the medium recording sensitivity and the temperature characteristic change of the optical component due to the temperature change in the apparatus during continuous recording for a long time. However, the recording light intensity can be controlled so that the recording state at the start of recording is maintained.

[0066]

As described above, according to the first aspect of the invention, the information recording medium is rotated to irradiate the information recording medium with light, and the intensity of the light is changed to form recording marks and spaces. In an information recording / reproducing apparatus for forming new binary information accompanied by formation of binary information or deletion of old binary information,
A main ray for forming or erasing the binary information from one light source, and a ray divided into at least two sub-rays which are located behind the main ray in the rotation direction of the information recording medium and have a relatively low intensity. An optical head for irradiating the same track formed on the information recording medium, and a photodetector for receiving and photoelectrically converting each reflected light from the information recording medium;
And a light intensity control means for controlling the light source by a control signal so that the light beam has an optimum intensity while performing intensity modulation of the light source necessary for forming or erasing value information. The output signal level of the photodetector corresponding to the sub-ray obtained when recording the space is set as one of the control signals of the light intensity control means, so that high-speed multi-value modulation is performed to form the recording mark. Even when the formation of recording marks and spaces is completed after passing the recording light beams such as a phase change type optical disc, one light source and light beam control system can be used to detect the recording light intensity by detecting the formation state of the recording marks and spaces. It is possible to optimally control and record information under optimal recording conditions.

According to the second aspect of the invention, in the information recording / reproducing apparatus according to the first aspect, the distance D between the principal ray and the subsidiary ray on the information recording medium is set to the recording mark and the space by the irradiation of the principal ray. Recording film transition time T of the information recording medium and rotation speed L of the information recording medium
Since V ≧ D × T × Lv is defined by v, it is possible to detect the recording state by the sub ray after the formation of the recording mark and the space is completed after the main ray has passed, and especially in the phase change recording method. It is effective when the recording mark is not formed during irradiation of the recording light beam.

According to the third aspect of the present invention, in the information recording / reproducing apparatus of the first aspect, the photodetection corresponding to the sub-ray obtained when recording a space having a length twice or more the minimum mark length. Since the output signal level of the detector is one of the control signals of the light intensity control means, the signal level from the output signal of the photodetector corresponding to the sub-ray when the data of the minimum recording mark and space combination is recorded. Can be detected to detect the accurate recording state.

According to the fourth aspect of the invention, in the information recording / reproducing apparatus according to the first or second aspect, a special data pattern having an error-correctable length is partially replaced and inserted into a data string of information during recording, Since the output signal level of the photodetector corresponding to the sub-ray obtained when recording the comparatively long space of the special data pattern is set as one of the control signals of the light intensity control means, the prediction is different for each information. It is possible to detect the accurate recording state with the same recording data (special data pattern) every time, instead of detecting the recording state that tends to be unstable with random binary data that is impossible. Since the special data pattern has a length capable of error correction, the information can be accurately reproduced when reproduced by the sub ray. In addition, by including data that is not in the original data modulation pattern or length, there is an advantage that the location of recording state detection can be easily specified.

According to a fifth aspect of the present invention, in the information recording / reproducing apparatus according to the fourth aspect, the special data pattern is formed by combining a mark and a space having a relatively short length and then combining a relatively long space. Therefore, when the main ray is recording a relatively long space, the amplitude of the output signal of the photodetector for the repetition of the relatively short mark and space recorded immediately before by the sub ray positioned behind it. And the average level can be calculated, and the recording state can be detected more accurately.

According to the invention of claim 6, claim 1,
In the information recording / reproducing apparatus described in 2, 3, 4 or 5,
An average means for averaging the output signals of the photodetectors corresponding to the sub-rays obtained when recording the space with the chief ray is provided, and the output signal of the average means is the control signal of the light intensity control means. Since the number is one, it is possible to detect the expansion and contraction of the recording mark or the space due to the intensity of the recording light beam with a simple circuit configuration, the recording light beam intensity can be optimally controlled, and information can be recorded in the optimal recording state. .

According to the invention of claim 7, claim 1,
In the information recording / reproducing apparatus described in 2, 3, 4 or 5,
An amplitude calculating means for calculating an output signal amplitude of the photodetector corresponding to the sub-ray obtained when the space is recorded by the chief ray is provided, and the output signal of the amplitude calculating means is controlled by the light intensity control means. Since it is one of the signals, it is possible to immediately detect the recording state such as the expansion / contraction of the recording marks and spaces and the writing condition, and it is possible to optimally control the recording light intensity.

According to the invention of claim 8, claim 1,
In the information recording / reproducing apparatus described in 2, 3, 4, 5, 6 or 7, a trial writing for calculating the optimum light intensity of the light source for the recording is performed before the data recording is started. The output signal level of the photodetector corresponding to the sub-ray obtained at the time of recording the space with the principal ray is set as a target value, and the output obtained at the time of recording the space with the principal ray at the time of recording data. Since the means for holding the output signal level of the photodetector corresponding to the sub-ray at the target value is provided, the recording light intensity can be controlled so as to hold the optimum recording condition obtained by trial writing. .

According to the invention of claim 9, claim 1,
In the information recording / reproducing apparatus described in 2, 3, 4, 5, 6 or 7, the photodetector corresponding to the sub-light beam obtained when the space is recorded by the main light beam immediately after the data recording is started. An output signal level is set as a target value, and means for holding the output signal level of the photodetector corresponding to the sub-ray obtained when the space is recorded by the main ray at the time of recording data at the target value is provided. Therefore, during continuous recording for a long time, even if the recording state changes due to changes in the media recording sensitivity and temperature characteristics of optical components due to temperature changes inside the device, the recording light intensity should be maintained at the beginning of recording. Can be controlled.

[Brief description of drawings]

FIG. 1 is a block diagram showing a part of an embodiment of an information recording / reproducing apparatus to which the invention described in claims 1 to 3 is applied.

FIG. 2 is a block diagram showing an example of the same embodiment.

FIG. 3 is a diagram showing an example of a recording light source intensity modulation waveform of a high speed WORM and an example of a recording light source intensity modulation waveform of a phase change type optical disc drive device including an erasing process.

FIG. 4 is a perspective view showing an arrangement of a chief ray and a subsidiary ray in the above-described embodiment.

FIG. 5 is a diagram showing recording state detection timing in the above-described embodiment.

FIG. 6 is a diagram showing an embodiment of an information recording / reproducing apparatus to which the invention according to claim 4 is applied.

FIG. 7 is a diagram showing a special data pattern generated by a special data generator in an embodiment of an information recording / reproducing apparatus to which the invention according to claim 5 is applied.

FIG. 8 is a block diagram showing a part of an embodiment of an information recording / reproducing apparatus to which the invention according to claim 6 is applied.

[Explanation of symbols]

 11 optical disk 16 light intensity control means 17 optical head 19 slit members 21, 22 beam splitters 24, 25 condenser lens 26-28 photodetector 32 special data generator 37 averaging means

Claims (9)

[Claims] 1. An information recording medium is rotated to irradiate the information recording medium with light, and the intensity of the light is changed to form binary information consisting of recording marks and spaces or erase old binary information. In an information recording / reproducing apparatus for forming new binary information, a principal ray for forming or erasing the binary information from one light source and a comparatively strong light beam positioned behind the principal ray in the rotation direction of the information recording medium. Optical head for irradiating the same track formed on the information recording medium with a light beam divided into at least two weak sub-rays, and light for photoelectrically converting each reflected light from the information recording medium. A detector and a light intensity control means for performing intensity modulation of the light source necessary for forming or erasing the binary information and controlling the light source with a control signal so that the light beam has an optimum intensity. Prepare for the above Information recording and reproducing apparatus characterized by the output signal level of the photodetector corresponding to the sub-beams obtained when recording space in light and one of the control signal of the light intensity control means. 2. The information recording / reproducing apparatus according to claim 1, wherein a distance D between a chief ray and a subsidiary ray on the information recording medium is
Information recording characterized in that D ≧ T × Lv is defined by the recording film transition time T of the information recording medium and the rotation speed Lv of the information recording medium where formation of recording marks and spaces by irradiation of the chief ray is completed. Playback device. 3. The information recording / reproducing apparatus according to claim 1, wherein the output signal level of the photodetector corresponding to the sub-ray obtained when recording a space having a length of at least twice the minimum mark length is set to the optical signal level. An information recording / reproducing apparatus characterized in that it is one of the control signals of the intensity control means. 4. The information recording / reproducing apparatus according to claim 1, wherein a special data pattern having an error-correctable length is partially replaced and inserted into a data string of information at the time of recording, and the special data pattern is relatively long. An information recording / reproducing apparatus characterized in that an output signal level of the photodetector corresponding to the sub-ray obtained when recording a space is set as one of control signals of the light intensity control means. 5. The information recording / reproducing apparatus according to claim 4, wherein the special data pattern is a combination of a mark having a relatively short length and a space having a relatively long space after repeating the space. Recording / playback device. 6. The information recording / reproducing apparatus according to claim 1, 2, 3, 4, or 5, wherein an output signal of the photodetector corresponding to the sub-light beam obtained when recording a space with the main light beam. An information recording / reproducing apparatus comprising an averaging means for averaging, and an output signal of the averaging means being one of the control signals of the light intensity control means. 7. The information recording / reproducing apparatus according to claim 1, 2, 3, 4 or 5, wherein an output signal amplitude of the photodetector corresponding to the sub-light beam obtained when the space is recorded by the main light beam. An information recording / reproducing apparatus characterized by comprising an amplitude calculating means for calculating, and an output signal of the amplitude calculating means being one of the control signals of the light intensity controlling means. 8. The information recording / reproducing apparatus according to claim 1, 2, 3, 4, 5, 6 or 7, for calculating an optimum light intensity of the light source for recording before starting recording of data. The test signal is written, and the output signal level of the photodetector corresponding to the sub-ray obtained when the space is recorded by the chief ray at the time of the trial writing is set as a target value, and then the chief ray is used for recording the data. An information recording / reproducing apparatus comprising means for holding the output signal level of the photodetector corresponding to the sub-ray obtained when recording a space at the target value. 9. The information recording / reproducing apparatus according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the sub-record obtained when the space is recorded by the principal ray immediately after starting the data recording. The output signal level of the photodetector corresponding to the light ray is set as a target value, and the output signal level of the photodetector corresponding to the sub-ray obtained when the space is recorded by the main ray at the time of recording data is the An information recording / reproducing apparatus comprising means for holding a target value.