JPS63121130A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To remarkably extend the number of times of repeating of the erasure and the recording of an optical disk, by recording the change values of recording power and erasing power on an erasing optical disk, and correcting the values at need. CONSTITUTION:The rewrite of a test data is executed by changing recording optical beam power and erasing optical beam power respectively, and a recording/erasure operating point at which the number of errors of read data become less than a prescribed value is investigated, and a set value at that time is recorded in the managing area of the optical disk, then, it is set as the set value hereafter. The change of the set value is performed in such way that a read verify operation which reads out the forefront sector of the said file with a severer condition after the lapse of a constant time, or prior to the rewrite of the data, is executed at the time of exchanging the erasing disk, and the set value is set so as not to exceed a power range recorded in advance in the managing area. In such way, it is possible to set the recording/erasure operating point of the recording medium at the optimum level.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical information recording/reproducing apparatus, and more particularly to an optimum setting of laser power for erasing/recording in an apparatus for recording/reproducing data on an optical disk.

Conventional technology Figure 3 shows the phase change between amorphous state A and crystalline state C of a phase change recording medium of a conventional optical information recording/reproducing device. The rate is large. If the temperature of the recording medium is locally raised to near the melting point and that part is annealed, it becomes a crystalline state. On the other hand, the temperature of the part in crystalline state C is locally raised to the vicinity of the melting point and rapidly cooled (annealed). quench), it becomes an amorphous state A.

FIG. 4(a) shows the configuration of the light beam that realizes the temperature raising/quick cooling condition and the temperature raising/slow cooling condition on the recording medium, and FIG. 4(b) shows its light distribution. A guide track on which a recording medium is deposited; 16 is a sector identifier (ID field) containing information such as track address and sector address; 17 is a data field for recording data;
8a and 18b are gaps for absorbing temporal fluctuations due to rotational fluctuations of the disk; 19 is a short-axis recording/reproducing light beam; 21 is its light intensity distribution; 20 is a long-axis erasing light beam; 22 is its light intensity distribution represents.

The two light beams enable so-called simultaneous erasure, in which sectors are erased and recorded in one rotation, by creating a rapid cooling condition on the short axis and a slow cooling condition on the long axis.

FIG. 4(c) shows the waveform of the reproduction signal 103 from the guide track 15 of the optical disc, including a sector identifier (ID field) 16 and gaps 18a and 18b.

The reflectance decreases in the order of data field 17.

FIG. 4(d) shows a write gate 106 that converts the recording/reproducing light beam 19 into a recording power for recording data.
Figure (e) shows an erase gate 107 that erases the data field 17 by irradiating the erase light beam 20 with a constant intensity. The data field 17 is erased by the preceding erasing light beam 20 with the write gate 106 and the erase gate 107 enabled, and data is recorded in the data field 17 by the subsequent recording/reproducing light beam 19. Light gate 10 at the end
6 and erase gate 107 are both turned off.

FIG. 5 is a diagram showing the number of erase repetitions when the beam intensities of the erase light beam 20 and the recording/reproducing light beam 19 are changed. The recording/reproducing light beam 19 has a median value PRo±1
This is an example in which the mW intensity is changed, and the erasing light beam 20 is changed by ±2 mW intensity from the median value PRo.

Problems to be Solved by the Invention However, in the above-mentioned recording medium, as is clear from FIG. There is a problem that the number of erase repetitions changes by nearly two orders of magnitude due to changes in the intensity of the recording/reproducing light beam 19 and the erasing light beam 20. Furthermore, since the sensitivity of the recording/erasing operating point usually decreases with age, it becomes even more difficult when considering the lifetime of the disk. For this reason, when using an erasing optical disc, it was necessary to set the number of repeated erasures one digit below the data in FIG. 5 for safety reasons.

In view of this, an object of the present invention is to provide an optical information recording/reproducing apparatus that can optimally set the recording/erasing operating point of a recording medium.

Means for Solving the Problems The present invention provides data rewriting means for rewriting data in a predetermined sector of an erasing optical disk, recording light beam power control means for changing the power of a recording light beam, and erasing means for changing the power of an erasing light beam. a light beam power control means; a data reading means for reading data from a predetermined sector;
a data error check means for checking the error occurrence status of the read data; a management data area of the optical disk for recording a value of recording light beam power and a value of erasing light beam power that minimize the error occurrence of the data error check means; The optical information recording and reproducing apparatus is characterized in that it has a light beam power value updating means for updating and recording the value of the recording light beam power and the value of the erasing light beam power in the management data area as new set values.

The present invention uses the above-described configuration to change the recording light beam power and the erasing light beam power to execute the rewriting of unused data, check the recording/erasing operation point at which the read data error is less than a predetermined value, and then The setting values of the recording light beam power and the erasing light beam power are recorded in the management area of the optical disc and are used as the setting values of the recording light beam power and the erasing light beam power for subsequent information erasing recording.

The setting values of the recording light beam power and erasing light beam power can be changed when replacing the erasing disk, after a certain period of time has passed, or by performing read verification, which reads the first sector of the file under stricter read conditions, before rewriting data. This is done when an error check is performed, when the power is turned on, and during self-diagnosis.

The set values of the recording light beam power and the erasing light beam power are changed with the values recorded in the management area of the optical disc as the origin, and are performed so as not to exceed the power range pre-recorded in the management area.

Embodiment FIG. 1 shows a block diagram of an optical information recording/reproducing apparatus in an embodiment of the present invention. In FIG. 1, 1 is a CPU, 2 is a buffer memory that temporarily stores data input or output from the system path 100, and 3 is encoded data that generates and decodes an error correction detection code and adds the error correction detection code. 101, and an error correction detection unit (EDAC) that corrects errors occurring in the read data 102; 4, a data modulation unit that digitally modulates data with error correction detection codes; 5, a recording/reproducing laser drive circuit; Recording/reproducing laser, 7 is erasing laser,
Reference numeral 8 denotes an erasing laser drive circuit, 9 a light-receiving element that receives the reflected reproduction light obtained by reflecting the reproduction light of the recording/reproducing laser 6 on the disk, 10 a head amplifier that amplifies the weak signal of the light-receiving element 9, and 11 a reproduction signal 103. 12 is a target address 104 from the CPUI.
The write gate 106 compares the read address 105 with the read address 105,
A sector control unit that generates an erase gate 107 and a read gate 108; 13 a recording power setting/A converter that generates a set voltage for varying the recording power of the recording/reproducing laser 6; 14 varying the erasing power of the erasing laser 7. This is an erase power setting/A converter that generates a setting voltage. 100 is a system path, 101 is an input data signal,
101 is encoded data, 102 is data demodulation section 11
103 is a reproduction signal from the head amplifier, 104 is a target address, 105 is a reproduction address read from the optical disk, and 106 is a start-up of the data modulation section 4 and a recording mode of the recording/reproduction laser drive circuit 5. 107 is an erase gate that sets the erase laser drive circuit 8 to erase mode; 108 is a write gate that instructs the data demodulator 11 to demodulate data;
109 is a write data signal from the data*tuning section 4;
110 is recording power setting data, 111 is erasing power setting data, 112 is a recording power setting voltage signal, 113 is an erasing power setting voltage signal, 114 is an error flag signal indicating the error occurrence status, 115 is a CPU data bus of the CPUI, A command 116 instructs to write, erase, and read data to the sector.

The operation of the optical information recording/reproducing apparatus of this embodiment configured as described above will be described below.

First, when a request to update the recording/reproducing optical beam power and erasing optical beam power is issued, the CPU seeks the management data area of the optical disc and reads information regarding the recording power and erasing power of the optical disc currently in use from the management data area. . That is, the CPUI sets the recording and reproducing laser 6 to the reproducing power, and sends the command 116 to the sector control unit 12 to set the address of the management data area to the target address 104.
Set the lead to . Upon detecting the address of the management data area, the sector control unit 12 outputs the read gate 108 to the data demodulation unit 1.1 to demodulate the reproduced signal 103, and
After error correction in AC3, the data is stored in buffer 2. C.P.U.I.
reads the CPU data and management data from path 115, and calculates the maximum and minimum values of recording power and erasing power, and the standard value (
initial value) and the currently used value.

Next, the host CPUI seeks the erase function diagnostic area. In this erasure function diagnosis area, the CPU repeatedly erases, records, and reproduces the test data while changing the power levels of the recording/reproducing laser 6 and the erasing laser 7, and determines the power value at which the error in the reproduced test data is minimal or within the specified value. Search for.

The CPUI generates test data and connects the CPU data bus 1
15 to buffer 2. The CPU 1 outputs to the recording power setting data 110 a value obtained by adding or subtracting a predetermined power value to the currently used recording power value.

Generally, when considering the lifespan of a recording medium, the required power increases with age, so the initial power value is kept as low as possible and the power value is changed to increase.

The recording power setting data 110 is converted into a voltage value by the recording power setting/A converter 13 and applied to the recording/reproducing laser drive circuit 5 as a recording power setting voltage signal 112, and the recording power of the recording/reproducing laser 6 is changed to write data 109. That is, the address of the erase function diagnosis area is set in the sector control unit 12, the target address 104, and the write command and erase command are set in the command 116. Sector control unit 1
2 outputs a write gate 106 and an erase gate 107 to the data modulation section 4, the recording/reproducing laser drive circuit 5, and the erasing laser drive circuit u8 when the reproduction address 105 and the target address 104 match. As explained with reference to FIG. 4, the erase gate 107 turns on the erase laser 7 and erases the corresponding sector with the erase light beam 20. Recording/reproducing laser 6
The recording/reproducing light beam 19 writes write data 109 with recording power. Write data 109 is in buffer 2
This is a signal obtained by digitally modulating data obtained by adding an error correction detection code generated by the EDAC 3 to user data in the data modulation section 11.

Next, the CPUI uses the sector control unit 12 described above to reproduce the data in the sector. When playing data, the ED
By comparing the error flag signal 114 from the AC 3 or the reproduced data stored in the buffer 2 with the original test data, the status of error occurrence is investigated and the data rewriting status is checked.

Further, the power of the erasing laser 7 is also checked in the same way as the recording/reproducing laser 6.

That is, the CPUI outputs to the erase power setting data 111 a value obtained by adding or subtracting a predetermined power value to the currently used erase power value. The erase power setting data 111 is converted into a voltage value by the erase power setting/A converter 14 and applied to the erase laser drive circuit 8 as an erase power setting voltage signal 113 to change the erase power of the erase laser 7 and rewrite the write data 109. Next, the CPUI uses the sector control unit 12 described above to reproduce the data in the sector.

When reproducing data, the rewritten state of the data is checked by comparing the error flag signal 114 from the HDAC 3 or the reproduced data stored in the buffer 2 with the original test data.

Combining the variable recording power and erasing power described above, find the power value that minimizes the error in the reproduced test data or within the specified value, and set that power value as the recording power in the management data area of the optical disc so that it can be used later. Record it in the current usage value section of erase power.

The CPUI inputs the obtained recording power value or erasing power value to other information in the management data area of FIG. 2(b): maximum value,
Write to buffer 2 along with minimum value and standard value, EDAC
3, an error correction detection code is added thereto, and the data is modulated by a data modulation unit 4 and recorded, that is, registered, on an erasure optical disc.

When the optical information recording/reproducing device is powered on or when an optical disk is replaced, the current values of the recording power and erasing power are read from the management data area of the mounted optical disk, and the current recording power and erasing power of the recording/reproducing laser and the erasing laser are checked. Set to the used value.

FIG. 2 shows an example of an optical disc layout having a management data area and an erasure function diagnosis area. Figure 2 (a
) indicates the disc layout of the management data area where the optical disc records management information such as recording power/erasing power and identification data, the erasing function diagnostic area for self-diagnosing the erasing function, and the user area where user data is recorded. FIG. 2(b) is a detailed view of the management data area, showing management data of recording power and erasing power.

The management data area is about recording power and erasing power.
The maximum value, minimum value, standard value or initial value, and currently used value of usable power are recorded, and the currently used value is updated by a power setting request.

Changing the currently used values of recording laser power and erasing laser power can be done by reading the first sector of the file under stricter reading conditions or verifying it after a certain period of time when replacing the erasing optical disc. This is done when executing an error check, when turning on the power, or during self-diagnosis.

The set values of the recording light beam power and the erasing light beam power are changed with the values recorded in the management data area of the optical disc as the origin, and are performed so as not to exceed the power range pre-recorded in the management area.

Effects of the Invention As described above, according to this embodiment, by recording the changed values of recording power and erasing power on the erasing optical disc and modifying these values as necessary, the number of repetitions of erasing and recording of the optical disc can be greatly increased. It can be extended to a long period of time, and its practical effects are great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an optical information recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a disk layout diagram of an embodiment of an optical disc having a management data area and an erasure diagnosis area.
FIG. 3 shows amorphous Ili! of a phase change recording medium of a conventional optical information recording/reproducing device. A phase change diagram of A and crystal state C. Figure 4 is an explanatory diagram of the configuration and distribution of the light beam that realizes the temperature raising/quick cooling conditions and temperature raising/slow cooling conditions on the recording medium, and erase recording. Figure 5 is the number of erase repetitions. FIG. 1... CPU, 2... Buffer memory, 3... Error correction detection section (EDAC), 4... Data modulation section,
5... Recording and reproducing laser drive circuit, 6... Recording and reproducing laser, 7... Erasing laser, 8... Erasing laser drive circuit, 9... Light receiving element, 10... Head amplifier, 11. ...Data demodulation section, 12.. Sector control section, 13.. Recording power setting/A converter, 14.
... Erase power setting/A converter, 15... Guide track, 16... Sector identifier (ID field), 17... Data field, 18a:18b...
・Gap, 19... Recording/reproduction light beam, 21...
19 light intensity distribution, 20... erase light beam, 22...
...20 light intensity distribution, 100...system path, 1
01... Input data signal, 101... Encode data, 102... Read data, 10゛3... Playback signal, 104... Target address, 105... Playback address, 108... Write Gate, 107...Erase gate, 108...Read gate, 109...
Write data signal, 110... Recording power setting data, 111... Erasing power setting data, 112...
Recording power setting voltage signal, 113... Erasing power setting voltage signal, 114... Error flag signal, 115.
...CPU data bus, 116...command. Name of agent: Patent attorney Toshio Nakao (1 person)

Claims (8)

[Claims] (1) A device for recording, reproducing, and erasing data on an optical disk, which includes a data rewriting means for rewriting data, an erasing light beam power control means for changing the power of the erasing light beam, and a data reading means for reading data from a predetermined area. , a data error check means for checking the error occurrence status of the read data; a management data area of an optical disc for recording a value of erasing light beam power that makes the occurrence of errors in the data error check means a minimum or a predetermined number or less; 1. An optical information recording/reproducing apparatus comprising: a light beam power value registration means for updating and recording a new set value of the erase light beam power value in the management data area. (2) a recording light beam power control means that changes the power of the recording light beam; and a management data area of the optical disc that records a value of the recording light beam power that minimizes the occurrence of errors in the data error checking means or below a predetermined number; 2. The optical information recording and reproducing apparatus according to claim 1, wherein the value of the recording light beam power is updated and recorded in the management data area as a new setting value. (3) The erase light beam power control means erases and records test data by changing the erase beam power in the erase function diagnostic area of the optical disk, and determines the value of the erase light beam power that minimizes the occurrence of errors or reduces the number of errors to a predetermined number or less. An optical information recording and reproducing apparatus according to claim 1, wherein the optical information recording and reproducing apparatus is configured as follows. (4) The recording light beam power control means erases and records test data by changing the recording beam power in the erase function diagnostic area of the optical disk, and determines the value of the recording light beam power that minimizes the occurrence of errors or reduces the number of errors to a predetermined number or less. An optical information recording/reproducing apparatus according to claim 2, wherein the optical information recording/reproducing apparatus is configured as follows. (5) The optical information recording/reproducing apparatus according to claim 1 or 3, wherein the erasing light beam power control means increases the erasing beam power. (6) The optical information recording/reproducing apparatus according to claim 2 or 4, wherein the recording light beam power control means increases the recording beam power. (7) Optical information recording and reproducing according to claim 1 or 2, wherein the management data area includes at least set maximum and minimum values and currently used values of the recording light beam and erasing light beam. Device. (8) Reading the power setting value of the recording light beam or erasing light beam from the management data area when turning on the power or replacing the optical disk, and setting the power setting value in the recording light beam power control means or the erasing light beam power control means. An optical information recording/reproducing apparatus according to claim 1 or 2, characterized in that: