JP3283402B2 - Optical recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording apparatus such as a phase change type optical disk apparatus for recording and reproducing information by irradiating a recording medium with light by a pickup.

[0002]

2. Description of the Related Art An optical recording apparatus for recording and reproducing information by irradiating a recording medium with light by a pickup includes a phase-change optical disk apparatus and the like. An information recording device for detecting dropout is described. This information recording device is a detector that receives light reflected from the recording surface of a light beam that does not participate in recording irradiated on the recording surface of the disc-shaped record carrier,
A dropout detector for detecting a dropout on the recording surface from the output of the detector and outputting dropout time width data, a position detector for detecting a recording radius position on the disc-shaped record carrier, and the disc An angle detector that detects a recording angle position on a shape record carrier, and a storage device that stores output data of the position detector and output data of the angle detector when the dropout detector detects dropout. Converting the time width data of the dropout detector into the forward dropout length by the output data of the position detector, classifying the dropout by comparison with a preset forward reference length, and counting the dropout. The first arithmetic unit and the plurality of dropouts stored in the storage device are continuously at the same angular position. And a second arithmetic unit that counts the number of dropouts, calculates the radial length of the counted dropouts, and classifies the dropouts by comparison with a preset radial reference length. It is.

Further, a magneto-optical disk drive manufactured by IBM Corporation records a signal on a magneto-optical disk when determining the recording power, and detects the amplitude of the signal recorded on the magneto-optical disk to reduce the recording power. I have decided.

In these information recording devices and magneto-optical disk devices, the purpose of detecting the reflected light from the recording surface by a detector or detecting the signal amplitude recorded on the magneto-optical disk is to directly drop out a defect that causes an error. And the determination of the recording power, but did not seek the optimum values of the linear density and the track pitch for changing the recording capacity.

[0005]

In the above optical recording apparatus,
When the recording capacity of the recording medium is increased, the erasing ratio of the recording medium is reduced due to the variation of the pickup and the variation of the recording medium, and if data is overwritten at a location where the erasing ratio is low, the previous data remains. That is, in many cases, the jitter increased and an error occurred. Further, when the recording capacity of the recording medium is increased by reducing the track pitch of the recording medium, the crosstalk increases, and the jitter also increases, often resulting in an error.

An object of the present invention is to provide an optical recording apparatus which can solve the above problems and can reduce errors even if the recording capacity of a recording medium is increased.

[0007]

According to a first aspect of the present invention, there is provided an optical recording apparatus for recording and reproducing information by irradiating a recording medium with light by a pickup. Erasing ratio measuring means for recording a recording signal on a recording medium a plurality of times by varying the pulse width of the recording signal and reproducing the same to measure an erasing ratio; Erase ratio comparing means for comparing a plurality of erase ratios obtained by measuring the erase ratio a plurality of times, and the highest erase ratio among the plurality of erase ratios obtained by the erase ratio compare means. Recording and reproducing means for recording and reproducing information on and from a recording medium at a high linear density.

According to a second aspect of the present invention, in the optical recording apparatus according to the first aspect, a recording signal is recorded on a recording medium a plurality of times by changing at least the track pitch of the recording signal in an initial setting, and reproduced by reproducing the recording signal. Crosstalk calculating means for measuring the amplitude of the RF signal and calculating a crosstalk value, wherein the recording / reproducing means has a track pitch at which the crosstalk value is equal to or less than a predetermined value, and Recording and reproduction of information on a recording medium at a high linear density.

The invention described in claim 3 is the first or second invention.
In the optical recording device described above, information is recorded and reproduced within a range where a predetermined recording capacity is maintained.

[0010]

FIG. 2 shows an example of the mark dependency of the erasing ratio in a phase change type optical disk apparatus. As can be seen from FIG. 2, in a phase change type optical disk apparatus which overwrites data as a mark on a phase change type optical disk, there is an optimum mark length, that is, an erasing ratio becomes a problem. As the capacity increases, the amplitude of a recording signal or a reproduction signal decreases.

Therefore, the embodiment of the invention according to the first aspect of the present invention is actually mounted on a phase change type optical disk apparatus for recording and reproducing information by irradiating a recording medium of a phase change type optical disk with a pickup. The average recording medium of a phase-change optical disc is evaluated based on the wavelength of the pickup (wavelength of light irradiated from the objective lens) and the numerical aperture, and the linear density with the highest erasing ratio is detected and confirmed. Data is recorded and reproduced. Here, the mark length with the best erase ratio is the linear density: bpi = 25.4E.
+3 μm / 2 mark length μm.

FIG. 1 schematically shows this embodiment. The pickup 11 forms a light spot by condensing laser light emitted from a semiconductor laser 12 serving as a light source on a recording medium of a phase-change optical disk 14 by an objective lens 13 via an optical system (not shown). The light reflected by the recording medium is received by the multi-segment light receiving element 15 via the objective lens 13 and an optical system (not shown). Arithmetic unit 1
6 calculates a signal from each divided portion of the multi-segment light receiving element 15 and calculates a focus error signal indicating a focus error of a light spot on the optical disc 14 and a tracking error signal indicating a tracking error of a light spot on the optical disc 14. , And a data signal.

The servo signal from the arithmetic unit 16 is input to a focus / track control circuit 17, which focuses the objective lens 13 on the optical disk 14
Track actuator 1 for driving in the radial direction of the
8 is controlled by a tracking error signal from the arithmetic unit 16 to perform tracking control. The focus / track control circuit 17 is a focus actuator 19 for driving the objective lens 13 in the vertical direction (optical axis direction).
Is controlled by a focus error signal from the calculation unit 16 to perform focus control. The data signal from the arithmetic unit 16 becomes a reproduced signal via a signal processing circuit (not shown).

The pickup 11 is connected to the optical disk 14
The seek motor 20 which is driven in the radial direction is controlled by a seek motor control circuit 21, and the entire pickup 11 is moved in the radial direction of the optical disk 14 by the seek motor 20 so that a light spot on the optical disk 14 is recorded / reproduced. To the track you want to do. Further, the spindle motor 22 is controlled by a spindle motor control circuit 23, and the optical disk 14 is rotated by the spindle motor 22.

The semiconductor laser control circuit 24 controls the semiconductor laser 1 so that the semiconductor laser 12 emits light at a required power.
2 is controlled. The control unit 25 including a CPU or the like as a control unit is a focus / track control circuit 1
7. Control the seek motor control circuit 21, the spindle motor control circuit 23, and the semiconductor laser control circuit 24 to perform the above-described operations on the recording medium of the optical disk 14 to record and reproduce information.

FIG. 3 shows an operation flow A for obtaining a line density with a high erase ratio according to this embodiment. The control unit 25 first performs an initial setting in step S1, and sets the peak power of the recording power of the semiconductor laser 12 to 15 mW and the bottom power to 5 mW.
And the frequency of the clock as a reference of the recording signal is set to 2
6 MHz, the reproducing power (read power) from the semiconductor laser 12 is set to 1 mW, the counter K is set to 1, the counter I is cleared to 0, the linear velocity of the optical disk 14 is 4 m / s, and the optical disk 14 is The measurement position of radius r =
Set to 23 mm to clear memories I to I + 10.

Next, the control unit 25 sets the line density to (mark length 0.3 μm + K × 0.1) in step S2.
The step (0.1) of the mark length can be changed. Next, the control unit 25 causes the semiconductor laser control circuit 24 to drive the semiconductor laser 12 so as to record the 3T signal on the recording medium of the optical disc 14 in step S3. Therefore, the semiconductor laser 12 emits a laser beam modulated by the 3T signal with the recording power of the peak power and the bottom power set as shown in FIG. 1
The optical disk 14 is condensed on the recording medium of No. 4
The 3T signal is recorded on the track on the recording medium. Here, the optical disk 14 is rotated by the spindle motor 22, and T is the period of the clock of the set frequency, which is the reference of the recording signal, and the pulse width of the 3T signal is three times the period of the clock. is there.

Next, in step S4, the control unit 25 drives the semiconductor laser control circuit 24 so that the semiconductor laser 12 emits light at the set reproduction power. The laser beam of reproducing power from the semiconductor laser 12 is condensed on a recording medium of an optical disk 14 by an objective lens 13 through an optical system (not shown), and the reflected light is split into multiple light beams through the objective lens 13 and an optical system (not shown). The light is received by the light receiving element 12. The calculation section 16 calculates signals from the respective divided portions of the multi-segment light receiving element 15 to obtain a focus error signal, a tracking error signal, and a data signal. The data signal is passed through a signal processing circuit (not shown) to a reproduction signal (RF signal). Becomes The control unit 25 detects the 3T signal from the reproduced signal through a band-pass filter of a frequency band of only the 3T signal frequency, measures the amplitude and the mark length from the 3T signal, and saves the mark in the memory I.

Next, the controller 25 drives the semiconductor laser control circuit 24 to drive the semiconductor laser 12 so as to record the 11T signal on the recording medium of the optical disk 14 in step S5. Therefore, the semiconductor laser 12 emits a laser beam modulated by the 11T signal with the set recording power of the peak power and the bottom power, and this laser beam passes through an optical system (not shown) and is recorded on the recording medium of the optical disk 14 by the objective lens 13. The 11T signal is recorded on the track on the recording medium of the optical disk 14 by being collected.

Next, in step S6, the control unit 25 drives the semiconductor laser control circuit 24 so that the semiconductor laser 12 emits light at the set reproduction power. The laser beam of reproducing power from the semiconductor laser 12 is condensed on a recording medium of an optical disk 14 by an objective lens 13 through an optical system (not shown), and the reflected light is split into multiple light beams through the objective lens 13 and an optical system (not shown). The light is received by the light receiving element 12. The calculation section 16 calculates signals from the respective divided portions of the multi-segment light receiving element 15 to obtain a focus error signal, a tracking error signal, and a data signal. The data signal is passed through a signal processing circuit (not shown) to a reproduction signal (RF signal). Becomes The control unit 25 detects the 11T signal from the reproduced signal through a band-pass filter having a frequency band of only the 11T signal frequency, measures the amplitude and the mark length from the 11T signal, and saves the measured signal in the memory I + 1.

Next, in step S7, the control unit 25 obtains the erase ratio by obtaining the ratio of the amplitudes in the memories I and I + 1 (the amplitude in the memory I + 1 / the amplitude in the memory I). Save to I. Next, the control unit 25 determines whether or not n has reached 5 in step S8. Since n has not reached 5, the control unit 25 adds 2 to the counter I and adds 1 to the counter K in step S9. Then, the process returns to step S2.

By repeating such an operation, the erase ratio is obtained at each line density. When n reaches 5, the control unit 25 determines in step S10 that the memories I, I + 2, I + 4, and I +
6, the erase ratios in I + 8 are compared, and the mark length in the memory in which the highest erase ratio is saved is determined as the minimum mark length, and at the same time, the mark lengths are determined in ascending order of the erase ratio. Thereafter, the control unit 25 causes the semiconductor laser control circuit 24 to record and reproduce information on and from the recording medium of the optical disc 14 with the minimum mark length (linear density) at which the erasing ratio is the highest.

FIG. 4 shows a first embodiment of the present invention.
Indicates a mark length of 0.5 μm, a track pitch of 1.0 μm, a recording capacity of 3.0 times, a wavelength of the pickup 11 (wavelength of light emitted from the objective lens 13) of 680 nm, a numerical aperture of 0.55, and an average block error rate of 2. 1%, erase ratio -3
9.5 dB. One time capacity is 650 MByte
And the minimum capacity is twice the capacity. The optical disk 14 is for example 180nm of ZnS _· S: O 2 / 20nm of Ag
Recording layer comprising a InSbTe (recording medium) / 25 nm of ZnS _· S: O 2 / 100nm of Al · Ti (1wt
%).

Further, as shown in FIG. 4, in the phase change type optical disk device of the comparative example, the operation flow A shown in FIG. 3 of the above embodiment is not performed, and the mark length is 0.4 μm, the track pitch is 1.1 μm, and the recording is performed. 3.5 times capacity, 1 pickup
1 wavelength (wavelength of light emitted from objective lens 13) 68
0 nm, numerical aperture 0.55, average block error rate 4.3
%, And the erase ratio is −25.3 dB. Therefore, in the above embodiment, the average block error rate is lower than that of the comparative example.

The second embodiment shown in FIG. 4 of the first aspect of the present invention has a mark length of 0.6 μm and a track pitch of 1.2 μm.
m, recording capacity 2.1 times capacity, wavelength of pickup 11 (wavelength of light irradiated from objective lens 13) 680 nm,
The numerical aperture is 0.55, the average block error rate is 1.8%, and the erase ratio is -42.1 dB. The average block error rate is lower than that of the comparative example.

The third embodiment shown in FIG. 4 of the first aspect of the present invention has a mark length of 0.5 μm and a track pitch of 1.1 μm.
m, recording capacity 2.8 times, wavelength of pickup 11 (wavelength of light irradiated from objective lens 13) 680 nm,
The numerical aperture is 0.55, the average block error rate is 1.5%, and the erasure ratio is -38.4 dB. The average block error rate is lower than that of the comparative example.

In the sixth embodiment shown in FIG. 4 of the first embodiment, the mark length is 0.55 μm and the track pitch is 1.0.
μm, recording capacity 2.8 times capacity, wavelength of pickup 11 (wavelength of light irradiated from objective lens 13) 680 nm,
The numerical aperture is 0.55, the average block error rate is 1.9%, and the erasure ratio is -41.2 dB. The average block error rate is lower than that of the comparative example.

The seventh embodiment shown in FIG. 4 of the first aspect of the present invention has a mark length of 0.6 μm and a track pitch of 1.1 μm.
m, 2.3 times the recording capacity, the wavelength of the pickup 11 (the wavelength of light emitted from the objective lens 13) 680 nm,
The numerical aperture is 0.55, the average block error rate is 1.7%, and the erasure ratio is -44.1 dB. The average block error rate is lower than that of the comparative example.

As described above, in the embodiments and examples,
In an optical recording apparatus composed of a phase-change type optical disk apparatus for recording and reproducing information by irradiating light to the recording medium of the optical disk 14 by the pickup 11, the recording medium is inspected by the wavelength and the numerical aperture of the pickup 11 to be mounted. Recording information on a recording medium at the linear density with the highest erasing ratio,
Since a control means including a semiconductor laser control circuit 24 and a control unit 25 is provided as a means for performing reproduction, an average recording medium of a phase-change optical disk is evaluated based on the wavelength and the numerical aperture of the pickup 11 actually mounted. By confirming the linear density with the highest erasure ratio, data can be recorded and reproduced at this linear density, and errors can be reduced even if the recording capacity of the recording medium is increased.

If the linear density is set to the linear density at which the erasing ratio is the best as in the above embodiment, the desired recording capacity of the phase-change optical disk device may not be obtained.
Therefore, in another embodiment of the present invention, in the above embodiment, the linear density at which the erasing ratio is the best within a range where the linear density is maintained at a predetermined recording capacity is confirmed. Recording and reproduction are performed. That is, the control unit 25 obtains the linear density from the best erasing ratio within the range of maintaining the predetermined recording capacity of the present embodiment among the erasing ratios obtained by the operation flow A shown in FIG. The recording / reproducing of information to / from the recording medium of the optical disk 14 is performed with the obtained linear density.

As described above, the other embodiment is implemented in an optical recording apparatus composed of a phase-change optical disk apparatus for recording and reproducing information by irradiating the recording medium of the optical disk 14 with light by the pickup 11. According to the result of inspecting the recording medium with the wavelength and the numerical aperture of the pickup 11,
Since a control means including a semiconductor laser control circuit 24 and a control unit 25 is provided as means for recording and reproducing information on and from a recording medium at a linear density having the highest erasing ratio within a range where a predetermined recording capacity is maintained, the information is actually mounted. The recording medium of the phase change optical disk is evaluated based on the wavelength and the numerical aperture of the pickup 11, and the linear density with the highest erasing ratio is detected and confirmed within a range where a predetermined recording capacity is maintained. Recording and reproduction can be performed, and errors can be reduced even if the recording capacity of the recording medium is increased.

In the phase-change type optical disk device, when the track pitch is reduced to increase the recording capacity,
Leakage signals (crosstalk) from adjacent tracks increase. Therefore, in still another embodiment of the present invention, in each of the above-described first embodiment, a phase change optical disk in which the track pitch is changed by the mounted pickup 11 is inspected for each phase change optical disk device. The minimum track pitch at which the talk value is equal to or less than a predetermined value, for example, -27 dB, is confirmed, and information is recorded and reproduced on the recording medium at this track pitch. Actually, each track pitch (for example, 0.3 μm to 1.1 μm
The signal recorded in each zone is reproduced on an adjacent track, and the minimum track pitch having a signal amplitude of -27 dB or less in the amplitude ratio of the reproduced signals is confirmed.

FIG. 5 shows an operation flow B for determining the track pitch according to this embodiment. The control unit 25 performs the operation flow B without performing the operation flow A, and first performs step S
Initial setting is performed at 11, the peak power of the recording power of the semiconductor laser 12 is set to 15 mW, the bottom power is set to 5 mW, and the frequency of the clock as a reference of the recording signal is set to 26M.
Hz, the reproduction power (read power) from the semiconductor laser 12 is set to 1 mW, the counter J is cleared to 0, the counter K is set to 1, the linear velocity of the optical disk 14 is 4 m / s, and the memory J Clear ~ J + 15.

Next, the control unit 25 sets the track pitch to a zone of (mark length 0.3 μm + K × 0.1) in step S 12, and causes the seek motor control circuit 21 to rotate the seek motor 20 to move the pickup 11. Optical disk 1
The track pitch is moved to the zone of (mark length 0.3 μm + K × 0.1) by moving in the radial direction of No. 4. The step (0.1) of the mark length can be changed.

Next, the controller 25 drives the semiconductor laser control circuit 24 to drive the semiconductor laser 12 so as to record the 11T signal on the recording medium of the optical disk 14 in step S13. Therefore, the semiconductor laser 12 emits a laser beam modulated by the 11T signal with the set recording power of the peak power and the bottom power, and this laser beam passes through an optical system (not shown) and is recorded on the recording medium of the optical disk 14 by the objective lens 13. The 11T signal is recorded on the track on the recording medium of the optical disk 14 by being collected.

Next, the control unit 25 drives the semiconductor laser control circuit 24 so that the semiconductor laser 12 emits light at the set reproduction power in step S14. The laser beam of reproducing power from the semiconductor laser 12 is condensed on a recording medium of an optical disk 14 by an objective lens 13 through an optical system (not shown), and the reflected light is split into multiple light beams through the objective lens 13 and an optical system (not shown). The light is received by the light receiving element 12. The calculation section 16 calculates signals from the respective divided portions of the multi-segment light receiving element 15 to obtain a focus error signal, a tracking error signal, and a data signal. The data signal is passed through a signal processing circuit (not shown) to a reproduction signal (RF signal). Becomes The control unit 25 passes the reproduced signal through a band-pass filter having a frequency band of only the
The signal is detected, its amplitude is measured from the 11T signal, and saved in the memory J together with the current track pitch.

Next, in step S15, the controller 25 causes the seek motor control circuit 21 to rotate the seek motor 20 to move the pickup 11 from the current track on the optical disk 14 to adjacent tracks on both sides of the optical disk 14 in order. The control circuit 24 drives the semiconductor laser 12 to emit light at the set reproduction power. Then, the control unit 25 detects the 11T signals for the adjacent tracks on both sides of the reproduced signal from the signal processing circuit through a band-pass filter having a frequency band of only the 11T signal frequency, and measures the amplitude of each of the 11T signals. Memory (J + 1), (J +
2) Save each.

Next, in step S16, the control unit 25 calculates the average value of the amplitudes in the memories (J + 1) and (J + 2) and the amplitude in the memory J (the average value of the amplitudes in the memories (J + 1) and (J + 2) / The value of crosstalk is obtained by obtaining the amplitude in the memory J, and the value of this crosstalk is stored in the memory (J +
Save to 1). Next, the control unit 25 determines in step S1
7, the crosstalk value in the memory (J + 1) is -27d
B is determined to be less than or equal to B, and if the value of the crosstalk in the memory (J + 1) is not less than -27 dB, 3 is added to the counter J in step S18, and 1 is added to the counter K.
And returns to step S12.

The memory (J +
When the value of the crosstalk in 1) becomes -27 dB or less,
The control unit 25 determines the current track pitch as the minimum track pitch at which the value of the crosstalk is equal to or less than -27 dB in step S19, and saves it in the memory J together with the mark length. The control unit 25 is hereinafter referred to as the seek motor control circuit 21.
To record and reproduce information on the recording medium of the optical disc 14 at the minimum track pitch in the memory J.

As described above, in the above-described still another embodiment, the optical recording apparatus including the phase-change optical disk apparatus for recording and reproducing information by irradiating the recording medium of the optical disk 14 with light by the pickup 11 is described. As a means for recording and reproducing information on a recording medium at a minimum track pitch at which a crosstalk value is equal to or less than a predetermined value, as a result of inspection of a recording medium having a track pitch changed according to the wavelength and numerical aperture of the pickup 11 to be performed. Since the control means including the seek motor control circuit 21 and the control unit 25 is provided, the recording medium of the phase change type optical disc in which the track pitch is changed by the wavelength and the numerical aperture of the pickup 11 actually mounted is evaluated and the cross section is evaluated. Detect and confirm the minimum track pitch at which the talk value is equal to or less than the predetermined value, and record data at this track pitch. Can be reproduced, it is possible to reduce the error to increase the recording capacity of the recording medium.

According to another embodiment of the present invention, the pickup medium to be mounted is used to inspect the recording medium of the optical disk 14 with the track pitch changed according to the operation flow B shown in FIG. After confirming the minimum track pitch at which the value of the crosstalk becomes equal to or less than a predetermined value, for example, -27 dB, the operation flow A shown in FIG.
The pickup 11 is used to inspect the recording medium of the optical disk 14 to confirm the linear density with the highest erasing ratio, and to record and reproduce data at the minimum track pitch and the linear density with the highest erasing ratio. It was made.

In a fourth embodiment shown in FIG. 4 of the present invention, in an optical recording apparatus for recording and reproducing information by irradiating a recording medium with light by a pickup, a track pitch is changed by a wavelength and a numerical aperture of a pickup to be mounted. A means for recording and reproducing information on and from the recording medium at a minimum track pitch at which the value of crosstalk is equal to or less than a predetermined value and at a linear density with the highest erasing ratio according to the result of inspection of the recorded recording medium. In this embodiment, the mark length is 0.6 μm, the track pitch is 1.0 μm, the recording capacity is 2.5 times the capacity, and the wavelength of the pickup 11 (the wavelength of light emitted from the objective lens 13).
The average block error rate was 680 nm, the numerical aperture was 0.55, the average block error rate was 2.0%, and the erase ratio was -45 dB.

In the fifth embodiment shown in FIG. 4 of the present invention, information is recorded by irradiating a recording medium with light by a pickup.
In an optical recording device that performs reproduction, a result of inspection of a recording medium in which a track pitch is changed by a wavelength of a pickup to be mounted and a numerical aperture indicates that a crosstalk value is a minimum track pitch that is equal to or less than a predetermined value, and This embodiment is provided with means for recording and reproducing information on and from a recording medium at a high linear density with a high erasure ratio. The embodiment has a mark length of 0.5 μm, a track pitch of 0.9 μm, a recording capacity of 3.4 times, and a pickup 11. (The wavelength of light emitted from the objective lens 13) is 680 nm, the numerical aperture is 0.55, the average block error rate is 2.5%, and the erasure ratio is -37.5 dB. The average block error rate is lower than that of the comparative example.

In the eighth embodiment shown in FIG. 4 of the present invention, light is applied to a recording medium by a pickup to record information.
In an optical recording device that performs reproduction, a result of inspection of a recording medium in which a track pitch is changed by a wavelength of a pickup to be mounted and a numerical aperture indicates that a crosstalk value is a minimum track pitch that is equal to or less than a predetermined value, and This embodiment is provided with means for recording and reproducing information on and from a recording medium at a high linear density with a high erasure ratio. The embodiment has a mark length of 0.5 μm, a track pitch of 0.9 μm, a recording capacity of 3.4 times, and a pickup 11. (The wavelength of light emitted from the objective lens 13) is 680 nm, the numerical aperture is 0.55, the average block error rate is 1.8%, and the erasure ratio is -40.3 dB. The average block error rate is lower than that of the comparative example.

In the ninth embodiment shown in FIG. 4 of the present invention, light is applied to a recording medium by a pickup to record information.
In an optical recording device that performs reproduction, a result of inspection of a recording medium in which a track pitch is changed by a wavelength of a pickup to be mounted and a numerical aperture indicates that a crosstalk value is a minimum track pitch that is equal to or less than a predetermined value, and This embodiment is provided with a means for recording and reproducing information on and from a recording medium at a high linear density with a high erasure ratio. The embodiment has a mark length of 0.6 μm, a track pitch of 1.0 μm, a recording capacity of 2.5 times, and a pickup 11. (The wavelength of light emitted from the objective lens 13) is 680 nm, the numerical aperture is 0.55, the average block error rate is 1.9%, and the erasure ratio is -39.8 dB, and the average block error rate is lower than that of the comparative example.

The tenth embodiment of the present invention shown in FIG.
In an optical recording device that records and reproduces information by irradiating a recording medium with light by a pickup, the value of crosstalk is determined by inspection of a recording medium in which the track pitch is changed by the wavelength of the mounted pickup and the numerical aperture. This embodiment is provided with means for recording and reproducing information on a recording medium at a minimum track pitch that is equal to or less than a predetermined value, and at a linear density with the highest erasing ratio, and has a mark length of 0.5 μm,
Track pitch 1.1 μm, recording capacity 2.8 times capacity, wavelength of pickup 11 (wavelength of light irradiated from objective lens 13) 680 nm, numerical aperture 0.55, average block error rate 2.5%, erasing ratio −38 .1 dB, and the average block error rate is lower than that of the comparative example.

As described above, in the above-described other embodiments and Examples 4, 5, 8 to 10, the phase change type optical disk in which the pickup 11 irradiates the recording medium of the optical disk 14 with light to record and reproduce information. In the optical recording apparatus comprising the device, the inspection result of the recording medium of the optical disc 14 in which the track pitch is changed by the wavelength and the numerical aperture of the pickup 11 to be mounted indicates that the minimum track pitch at which the crosstalk value is equal to or less than a predetermined value, As a means for recording and reproducing information on and from the recording medium of the optical disk 14 at the linear density with the highest erasing ratio, a control unit including a seek motor control circuit 21, a semiconductor laser control circuit 24, and a control unit 25 is provided.
The recording medium of a phase change optical disk in which the track pitch is changed by the wavelength and the numerical aperture of the pickup 11 actually mounted is evaluated, and the minimum track pitch at which the crosstalk value becomes a predetermined value or less, High linear density can be detected and confirmed, and data can be recorded and reproduced at this track pitch and the linear density with the highest erasing ratio, and errors can be reduced even if the recording capacity of the recording medium is increased. .

According to still another embodiment of the present invention, the recording medium of the optical disk 14 having the track pitch changed by the mounted pickup 11 is inspected and the value of the crosstalk is changed to a predetermined value. , For example, -27d
After confirming the minimum track pitch of B or less, the mounted pickup 11 inspects the recording medium of the optical disk 14 to confirm the erasing ratio, and the control unit 25 further determines a predetermined erasing ratio among the erasing ratios in the present embodiment. After confirming the linear density from the best erasing ratio in the range where the recording capacity is maintained, the control unit 25 thereafter sets the seek motor control circuit 21 and the semiconductor laser control circuit 24
Then, recording and reproduction of information on the recording medium of the optical disk 14 are performed at the confirmed linear density and minimum track pitch. Here, the control unit 25
The mark length from the reference [｛predetermined storage capacity (multiple of the reference capacity) / track pitch of the reference capacity] so as to maintain the predetermined storage capacity based on the erase ratio obtained by inspecting the recording medium of the optical disk 14 with the mounted pickup 11. .mu.m / track pitch .mu.m.times.mark length of reference capacity}] to determine the linear density at which the erasing ratio is the best within a range where a predetermined recording capacity is maintained.

As described above, in the above-described still another embodiment, the optical recording apparatus including the phase-change optical disk apparatus for recording and reproducing information by irradiating the recording medium of the optical disk 14 with light by the pickup 11 is described. As a result of inspecting the recording medium with the wavelength and the numerical aperture of the pickup 11, the minimum track pitch at which the crosstalk value is equal to or less than a predetermined value, the track pitch at which the linear density of the erasing ratio is high and the predetermined recording capacity is maintained A seek motor control circuit 21, a semiconductor laser control circuit 24, and a control unit 2 as means for recording and reproducing information on and from a recording medium in a combination of linear densities.
5, the recording medium of the phase-change type optical disk in which the track pitch is changed by the wavelength and the numerical aperture of the pickup 11 actually mounted is evaluated, and the value of the crosstalk becomes equal to or less than a predetermined value. The minimum track pitch, the line density with a high erasure ratio, and the combination of the track pitch and the linear density that maintain a predetermined recording capacity are confirmed, and data can be recorded and reproduced at the track pitch and the linear density. Even if the recording capacity of the medium is increased, errors can be reduced.

[0050]

As described above, according to the first aspect of the present invention, the average recording medium is evaluated based on the wavelength and the numerical aperture of the actually mounted pickup, and the highest linear density of the erasing ratio is determined. After confirmation, data recording and reproduction can be performed at this linear density, and errors can be reduced even if the recording capacity of the recording medium is increased.

According to the second aspect of the present invention, the recording medium of the phase change type optical disk in which the track pitch is changed by the wavelength and the numerical aperture of the pickup actually mounted is evaluated, and the value of the crosstalk becomes a predetermined value. By checking the following track pitch, data can be recorded and reproduced at this track pitch, and errors can be reduced even if the recording capacity of the recording medium is increased.

According to the third aspect of the present invention, the recording medium is evaluated based on the wavelength and the numerical aperture of the actually mounted pickup, and the linear density with the highest erasing ratio is confirmed within the range where the minimum recording capacity is maintained. Data can be recorded and reproduced at this linear density, and errors can be reduced even if the recording capacity of the recording medium is increased.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically illustrating an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing an example of mark length dependence of an erasing ratio in a phase change optical disk device.

FIG. 3 is a flowchart showing an operation flow of an embodiment of the present invention.

FIG. 4 is a diagram showing experimental results of each embodiment of the present invention.

FIG. 5 is a flowchart showing an operation flow of another embodiment of the present invention.

FIG. 6 is a waveform chart showing an example of a semiconductor laser output waveform of the embodiment.

[Explanation of symbols]

 11 Pickup 14 Optical Disk 21 Seek Motor Control Circuit 24 Semiconductor Laser Control Circuit 25 Control Unit

Continuation of the front page (56) References JP-A-63-7520 (JP, A) JP-A-6-223430 (JP, A) JP-A-5-298737 (JP, A) JP-A-62-28935 (JP) JP-A-3-2699827 (JP, A) JP-A-5-290410 (JP, A) JP-A-5-62358 (JP, A) JP-A-6-176367 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 20/10

Claims (3)

(57) [Claims] 1. A of irradiating the recording medium with light by the pickup information recording, an optical recording apparatus for reproducing an initial setting
At least several times with different pulse widths of the recording signal
The recording signal is recorded on a recording medium, which is reproduced to determine the erasing ratio.
Erasure ratio measuring means to be measured and initial
Make the erase ratio multiple by changing at least the line density of the setting
Erasure comparing multiple erasure ratios obtained by multiple measurements
Ratio comparing means, and the plurality obtained by the erasing ratio comparing means.
Recording medium at the linear density with the highest erasing ratio among the erasing ratios
An optical recording apparatus comprising: a recording / reproducing means for recording and reproducing information on a body . 2. An optical recording apparatus according to claim 1, wherein
Set at least the track pitch of the recording signal to be different
Record the recording signal on the recording medium multiple times,
Measure amplitude of RF signal and calculate crosstalk value
Further comprising a crosstalk calculating means, wherein the recording and reproducing means
Is a track whose crosstalk value is equal to or less than a predetermined value.
Recording medium at a pitch and a linear density with the highest erasing ratio.
An optical recording apparatus for recording and reproducing information on a body . 3. An optical recording apparatus according to claim 1, wherein
Recording and playback of information within the range of maintaining the specified recording capacity.
An optical recording device characterized by performing .