JPS63121131A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To separate the generation of a recording mark or defect at the time of turning OFF an erasing optical beam from an information part, by providing an information part terminating signal part at the terminating part of the information part, and turning OFF the erasing optical beam by detecting the information part terminating signal part. CONSTITUTION:When information is rewritten, the erasing optical beam 7 is projected on the information part prior to a recording and reproducing optical beam 6, and old information is erased by applying temperature up and annealing with erasing optical beam 7. And the recording of new information is performed by applying the temperature up and quenching setting the recording and reproducing optical beam 6 as recording light intensity, and after the recording of the new information being completed, the information part terminating signal part EOS 15 is detected, then, the erasing optical beam 7 is turned OFF. In such way, by generating a temperature up and quenching condition or thermal shock generated at the time of turning OFF the erasing optical beam 7 behind the information part, it is possible to prevent the recording mark due to the fluctuation or the decentering of the rotation of a disk, and the defect due to the thermal shock from being affected on the information part.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information recording and reproducing apparatus, and more particularly to an erasable optical information recording and reproducing apparatus that records and reproduces information by irradiating an optical disc with a laser beam.

Prior Art □ Figure 5 shows the phase change between amorphous state A and crystalline state C of a phase change recording medium of a conventional information recording/reproducing device. The reflectance is large, and when the temperature of the medium is locally raised to near the melting point and that part is slowly cooled, it becomes crystalline state C. On the other hand, when the temperature of the part in crystalline state C is locally raised to near the melting point and then rapidly cooled, it becomes crystalline state A.
becomes.

FIG. 6 is a diagram showing the principle of recording and erasing signals for use in recording and erasing signals using a recording and reproducing light beam and an erasing light beam. 6th
FIG. 6(a) shows the configuration of a light beam that realizes the temperature raising and rapid cooling conditions and the temperature raising and slow cooling conditions for the medium, and FIG. 6(b) shows its light distribution. In FIG. 6, 17 is a recording/reproducing light beam with a short axis, 17a is its distribution, 18 is an erasing light beam with a long axis, 1
8a is its light distribution. 16 is a guide track on which a recording medium is deposited. The difference in light beam diameter has the function of creating a heating and rapid cooling condition for the short axis and a heating and slow cooling condition for the long axis. Sixth,
Figure (c) shows the sector identifier part (hereinafter referred to as ID part) and information part (D
ATA) represents the waveform of the reproduced signal from the gap portion.

FIG. 6(d) shows a write gate 106 that sets the recording/reproducing light beam 17 in the recording mode, modulates it with write data, and instructs it to be written in the information area, and FIG. 6(e) shows the erasing light beam 18 at a constant intensity. This is an erase gate 107 that controls the period of time during which the information section of the guide track 16 is irradiated. The information section is erased by the preceding erasing light beam 18 by enabling the write gate 10'6 and the erase gate 107, the write data is recorded by the subsequent recording and reproducing light beam 17, and the write gate is closed at the end of data recording. 106 and erase gate 107fi: Both are turned off.

Problems to be Solved by the Invention However, in the above configuration, the light gate 106
Since the erase gate 107 and the erase gate 107 are turned off at the same time, writing on the medium is performed with the erase light beam 18 as shown at 28 in FIG. 6(C). Erasing the medium is done using the erasing light beam 18.
Normally, the gradual temperature increase and cooling is realized as the overall effect of the peak at the front of the distribution 18a of the erase light beam 18 and the −-like light distribution at the rear, but when the erase gate 107 is off. The moment it becomes, erasing light beam 1
At the beginning of the distribution 18a of 8, the light at the rear of the distribution 18a of the erasing light beam 18 is turned off and is not irradiated, so the portion where the recording threshold optical power pt or more of the medium is exceeded becomes a heating and cooling condition and is not recorded. It is recorded as a mark 28.

The position of these recording marks 28 changes by several tens of micrometers to 100 micrometers due to jitter caused by eccentricity and rotational fluctuations of the disk, and since the previous recording traces 28 are only partially erased, after being erased many times, the width is several tens of micrometers. Since the signal has a large amount of DC components, the reproduced signal has waveform distortion such as a bump due to a change in the DC component in the gap, which has the problem that the ID section of the next sector cannot be read with accuracy. Furthermore, since the erasing light beam 18 is abruptly turned off as described above, a thermal shock is applied to the medium. As a result, the effect of thermal expansion that occurs in the recording medium in the information area of the sector at the off-part of the erasing light beam 18 may cause the recording film to separate from the base material and cause defects, or when the erasing light beam 18 is off. Repeated recording and erasing of parts caused significant thermal fatigue, which sometimes deteriorated the recording and reproducing characteristics.

In view of the above, an object of the present invention is to provide an information recording/reproducing apparatus in which recording marks and defects caused by the erasing light beam do not occur in the gap at the rear of the data section.

Means for Solving the Problems The present invention provides a recording/reproducing means for recording/reproducing information by a recording/reproducing light beam, which includes an information section termination signal section at the end of the information section of an optical disk for recording/reproducing/erasing information, and an erasing light beam. This optical information recording and reproducing apparatus includes an erasing means for erasing information at a time, and an erasing light beam control means for turning off the light intensity of the erasing light beam by detecting the information end signal part.

Effect of the present invention With the above-described configuration, when rewriting information, the erasing light beam irradiates the information section in advance of the recording/reproducing light beam, and the erasing light beam performs heating and slow cooling to erase the old information, and then the recording/reproducing operation is performed. The light beam is used as the recording light intensity to perform heating and rapid cooling to record new information, and after the recording of the new information is completed, the end signal section of the information section is detected and the erasing light beam is turned off. By making the heating/quick cooling conditions and thermal shocks occur after the information section, it is possible to prevent recording marks due to fluctuations in disk rotation and eccentricity and defects due to thermal shock from spreading to the information section.

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 101 that generates and decodes an error correction detection code and adds the error correction detection code. 4 is a data modulation section that digitally modulates data with an error correction detection code, 5 is a recording and reproducing laser drive circuit, and 6 is a recording circuit. Reproducing laser, 7 is erasing laser,
8 is an erasing laser drive, live circuit, 9 is a recording/reproducing laser 6
A light-receiving element 1.10 receives the reflected reproduction light that is reflected by the disk, and a head amplifier 1.11 amplifies the weak signal of the light-receiving element 9. A head amplifier 1.11 is a data demodulator that digitally demodulates the reproduction signal 103. 12 is a CPU Compare the CPU data 104 and the playback address 105 from the write gate 1.
06, a sector control unit that generates an erase gate 107 and a read gate 108; 13, a light receiving element 2 that receives reflected erasing laser light from which the erasing light of the erasing laser 7 is reflected by the disk; 14, a light receiving element 2 that receives a weak signal from the light receiving element 13; The amplifying head amplifier 2.15 is an information section termination signal section EO8 detection section that detects the information section termination signal 112 from the information section termination signal section EO5 from the reproduction signal 111 of the head amplifier 2. 100 is a system path, 101 is encoded data, 102 is read data demodulated by the data demodulator 11, 103 is a playback signal from the head amplifier 10, 104 is CPU data, 105 is a playback address read from the optical disc,
106 is a write gate that activates the data modulation unit 4 and sets the recording/reproducing laser drive circuit 5 to recording mode; 107 is an erase laser drive circuit! ! 88 is an erase gate that sets the erase mode, 108 is a read gate that instructs the data demodulation section 11 to demodulate data, 109 is write data from the data modulation section 4, 110 is a CPU command, 111 is a reproduction signal, and 112 is an information section. This is a termination signal.

FIG. 2 is an operational waveform diagram of FIG. 1. In Figure 2,
16 is a guide track, 17 is a recording/reproducing light beam, and 18 is an erasing light beam. FIG. 2(a) shows the waveform of the reproduced signal 103 reproduced by the recording and reproducing light beam, and shows the waveform of the reproduced signal 103 in sector n.
is sector identifier part (ID part), gap G1, information part (
DATA), gap G2, information section termination signal section EO5,
It consists of a gap G3. FIG. 2(b) is a waveform diagram of the reproduced signal 111 reproduced by the erasing light beam 18. Since the erasing light beam is long, the high frequency components of the ID part and the information part are difficult to reproduce, and the information part end signal part EO8 is not reproduced well. FIG. 2(c) shows the positional relationship between the recording and reproducing light beam 17 and the erasing light beam 18 on the guide track 16, and FIG. 2(d) shows the power change of the erasing laser 7. FIG. 2(e) is an internal signal of the sector control unit 12, which is an address match signal 113 between the target address and the reproduction address.
(See FIG. 3), FIG. 2(f) shows the information section termination signal 112.
, Fig. 2(g) shows the light gate 106, Fig. 2(h)
is the write data 109, and FIG. 2(i) is the signal waveform reception of the erase gate 107.

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

An example of rewriting the information section of sector n will now be described.

User data is written to buffer 2 from system path 100. After starting EDAC3, the CPU
A target address (n) is output to the U data 104, and a write command and an erase command as sector control commands are output to the sector control unit 12.

After track seek and rotation wait, recording/playback beam 1
7 outputs ■D information of sector n to the reproduction address signal 105, the sector control unit 12 outputs the erase gate 107, and then after the gap 1 time, the write gate 106 is connected to the data modulation unit 4 to drive the recording and reproduction laser. applied to circuit 5. The data modulation unit 4 sends encoded data 10 to the EDAC 3.
Request 1.

The EDAC 3 reads user data from the buffer 2 and outputs encoded data 101 to which an error correction detection code has been added to the data modulation section 4 . The data modulator 3 outputs write data 109 to the recording/reproducing laser drive circuit 5.

As shown in FIG. 2(c), the erasing light beam 18 is ahead of the recording/reproducing light beam 17 by a time t. Therefore,
The old information section is first heated and slowly cooled by the erase light beam 18 to become an amorphous state A, that is, an erased state (level of gap 1.2).The erase gate 107 is input to the erase laser drive circuit 8, and the erase laser 7 lights up at a certain output. The write data 109 and the write gate 106 are input to the recording/reproducing laser drive circuit 5, which modulates the recording/reproducing laser 6 with the recording light intensity level, and records data by heating and cooling rapidly.

When the data recording is completed, the light game 106 is turned off.

The light intensity of the erasing light beam 18 is set to a constant output level when the information section is irradiated, as shown in FIG. 2(d), and is turned off when the information section termination signal 112 (FIG. 2(f)) is detected. .

That is, the erasing light beam 18 is transmitted to the information section end signal section EO5.
It is turned off during the gap G3 between the ID section and the ID section, and defects such as sagging or tearing of the recording film due to thermal shock applied to the recording medium and recording marks are confined in the gap G3. This means that defects and recording marks at the rear end of the information section that conventionally occur when the erasing light beam 18 is turned off can be limited to the gap G3.
It is possible to prevent defects and recording marks from occurring in the information section.

FIG. 3 is a block diagram of one embodiment of the sector control unit 12. In FIG. 3, 19.20 is a latch, 21 is an AND gate, 22.23 is a latch, 24 is an address-number comparison circuit, and 25 is a delay circuit. 410a is a command set strobe, and 110b is an address set strobe, which constitute 110 CPU commands. 113 is an address match signal, and 114 is a data modulation end signal.

The operation of the sector control section of this embodiment configured as described above will be described below.

The CPU latches 1 the commands for recording, playing, and erasing the CPU data 104 using the command set strobe 110a.
Set to 9. The latch 19 receives a read command 114 and a write command 11 depending on the contents of the CPU data 104.
5, or set the erase command 116.

Now, the case of erasing and recording will be explained as an example. cPUl is C
Outputs a write command and an erase command to the PU data 104 and stores them in the latch 19 using the command set strobe 110a, then outputs the target address data to the CPU data 104 together with the address set strobe 110b, and sets the target address in the latch 20. . The target address 117 of the latch 2o and the reproduction address 105 from the optical disk are compared in the address-number comparison circuit 24,
When the playback address 105 matches the target address 117, the address match signal 113 is output, and at the rising edge of the address match signal 113, the write command 115 and erase command 116 are set in the latches 22 and 23, respectively, and the write gate 106 and erase gate 107 are activated. Output. The gate 106 is cleared by the data modulation end signal 114 from the data modulation section 4. Also, erase gate 1
07 is cleared in the gap 03 period by delaying the information section end signal 112 that detected the information section end signal section EO5 by the delay circuit 25. Read gate 18 is address match signal 1
13 and a read command 114 are gated by an AND gate 21.

In the above manner, erase gate 1o7 is set to gap 0.
It can be turned off after 3 periods.

FIG. 4 shows an embodiment of the information section end signal section EO5 and the gap G3 provided on the guide track 16 of the optical disc. FIG. 4(a) shows the track groove arrangement of the guide track 16, and FIG. 4(b) shows a waveform diagram of the reproduced signal 103. The information section termination signal section EO5 has a land section (flat section) 26 and a bit section (
A long land portion (flat portion) 26 and a bit portion (groove portion) that can be reproduced by the erasing light beam 18.
In addition to being reproducible with the erasing light beam 18, this feature is resistant to defects such as dropouts on the optical disc.゛Also, the land portion (flat portion) 26
and the bit part (groove) 27 multiple times, or change the depth of the bit part (groove) 27 to (λ/8)/(2m+1) or (λ/4)/(2m+1) (where λ is #A when the erasing light beam is off by selecting a large value m as the wavelength of the optical disk substrate of the laser (m is an integer) and increasing the groove depth.
WRM can be prevented from being transmitted to the intelligence department. gap G
3 shows a groove structure in the embodiment shown in FIG. 4, but the structure is not limited to this, and a flat portion may be used. Further, although the above description has been made regarding an optical disc having a sector structure, it goes without saying that the present invention is also applicable to an optical information recording/reproducing apparatus that records information on a track-by-track basis.

As described in detail, according to the present invention, the information section end signal section EO5 is provided at the end section of the information section, and the information section end signal section E
By turning off the erasing light beam upon detection of O3, it is possible to isolate the occurrence of recording marks or defects from the information section when the erasing light beam is turned off, and it is possible to perform good data recording, reproduction, and erasure in the information section. , 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, FIG. 2 is a signal waveform diagram of each part of the embodiment of FIG. 1, and FIG. 3 is a diagram of an embodiment of the sector control section. 4 is a block diagram of an embodiment of the information section termination signal section EOS, and FIG. 5 is a diagram showing the phase change A of a conventional optical information recording/reproducing device, the amorphous state A and the crystalline state C of the recording medium. FIG. 6 is a diagram illustrating the structure and distribution of the light beam that realizes the temperature raising and rapid cooling conditions and the temperature raising and slow cooling conditions on the recording medium, and the principle of recording and erasing. 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 1.10... Head amplifier 1. DESCRIPTION OF SYMBOLS 11... Data demodulation section, 12... Sector control section, 13... Light receiving element 2.14... Head amplifier 2.15... Information section termination signal section EO3 detection section, 16.
... Guide track 16.17 ... Recording and reproducing light beam,
18... Erasing light beam, 19.20... Latch, 2
1...And gate, 22.23...Latch, 24
...Address-number comparison circuit, 25...Delay circuit, 2
6...Land part (flat part), 27...Bit part (groove part), 28...Record trace, 1o. ...System path, 101...Encoded data,
102...Read data, 103...Reproduction signal, 1
04...CPU data, 105...Playback address,
106... Write gate, 107... Erase gate, 108... Read gate, 109... Write data, 110... CPU command, 111... Playback signal, 112... Information section termination signal , 110a... Command set strobe, 110b... Address set strobe, 113... Address match signal, 114
...Data modulation end signal, ID...Sector identification part, G1, G2, G3...Gap part, DATA...
Information section, EO3...Information section terminal signal section. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 3 Figure 4 (b) Figure 5

Claims (5)

[Claims] (1) An optical disc provided with an information end signal part at the end of the information part of an optical disc for recording and reproducing information, means for sequentially irradiating the optical disc with an erasing light beam and a recording and reproducing light beam, and the recording and reproducing light beam. recording and reproducing means for recording and reproducing information with a beam; means for erasing information with the erasing light beam; information section end signal detecting means for detecting the information section end signal section; and information on the information section end signal detecting means. An optical information recording/reproducing apparatus comprising an erasing light beam control means for turning off the erasing light beam upon detection of an end signal. (2) The optical information recording and reproducing apparatus according to claim 1, wherein the information section end signal detecting means detects the information section end signal section by reading out the information section end signal section with an erasing light beam. . (3) The optical information recording and reproducing apparatus according to claim 1 or 2, characterized in that the erasing light beam control means is turned off during a gap period provided next to the information section end signal section of the optical disc. . (4) The optical information recording and reproducing apparatus according to claim 1, 2, or 3, further comprising a delay means for delaying the detection of the information end signal by the information end signal detecting means. . (5) The optical information recording and reproducing apparatus according to claim 4, wherein the delay means is activated by changing its delay time irregularly.