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1. 发明专利

JPH056626A METHOD FOR REWRITING DEFECT CONTROLLING REGION OF OPTICAL DISK IN COMPLIANCE WITH ECMA STANDARD 失效
公开(公告)号：JPH056626A
公开(公告)日：1993-01-14
申请号：JP21551691
申请日：1991-08-27
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： OZAKI MINORU , YOSHIMOTO KYOSUKE , ONDA HIROYUKI , YAMANA KOJI , NAGATA TAKUYA , MURATA HIDEHIKO , KOBAYASHI YUTAKA
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/0055 , G11B11/10 , G11B11/105 , G11B19/00 , G11B19/02 , G11B19/04 , G11B20/12
摘要： PURPOSE:To prevent the mixed presence of a defect control region having the first information and a defect controlling region having the third information by writing the third information after the entire first information in four defect regions has been erased. CONSTITUTION:When defective sector information to be rewritten is formed in each DMA with a RAM 5, a controller 7 moves an optical head 2 to the leading position of the DMA 1 through a head driving means 4. At this time, when power failure occurs after new defective sector information has been written, the DMAs having the different pieces of defective sector information are mixed in the same disk. Then, the optical head 2 is moved to the leading position of the DMA 3, and the contents of the DMA 3 and the DMA 4 are sequentially erased. In this way, the DMAs having the different pieces of defective sector information do not exist on the optical disk 1 even if the power failure occurs.

2. 发明专利

JPH0676308A OPTICAL DISK DRIVING DEVICE 失效
公开(公告)号：JPH0676308A
公开(公告)日：1994-03-18
申请号：JP19155491
申请日：1991-07-31
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： ONDA HIROYUKI , MURATA HIDEHIKO , NAGATA TAKUYA , MASHITA TSUGUAKI , YOSHIMOTO KYOSUKE , OZAKI MINORU , FURUKAWA TERUO
IPC分类号： G11B7/00 , G11B7/005 , G11B7/085
摘要： PURPOSE:To prevent a spot light of an optical head from deviating from a prescribed region of an optical disk by monitoring always existence of the spot light of the optical head in the prescribed region of the optical disk. CONSTITUTION:This device is provided with an address reproducing circuit 15 which always monitors that a region of an optical disk 2 to which an optical head 12 accesses is in a prescribed region or not with its address, a CPU 16 which outputs a still command immediately when the present address deviates from an user area of the optical disk 2 based on this monitored result, and a tracking control circuit 14 which the optical head 12 to the same track by the still command from the CPU 16. Thereby, the optical head 12 is prevented from deviating from the user area of the CPU 16.

3. 发明专利

JPH04206075A OPTICAL DISK APPARATUS 失效
公开(公告)号：JPH04206075A
公开(公告)日：1992-07-28
申请号：JP33753290
申请日：1990-11-30
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： MASHITA TSUGUAKI , ONDA HIROYUKI , NAGATA TAKUYA , MURATA HIDEHIKO , YOSHIMOTO KYOSUKE , KIYOSE YASUHIRO , NAKANE KAZUHIKO , FURUKAWA TERUO
IPC分类号： G11B7/00 , G11B7/005 , G11B20/18
摘要： PURPOSE:To change regenerating conditions and to enhance the probability for reproducing data by regenerating the data of an optical disk based on reflected light of a light beam which is projected on the optical disk, and performing reproduction again when the regeneration fails. CONSTITUTION:An optical beam LB which is emitted from an optical head 1 accesses the recording region of a track from which data are to be regenerated. The reflected light from the recording region is received with the optical head 1. An output signal SO associated with the amount of the received light is inputted into an attenuated-amount changing circuit 5. An output signal SA of the circuit 5 is inputted into an address-signal detecting circuit 6, and the signal SA associated with the address is detected. When an output signal SAO from an address-signal-discontinuity detecting circuit 9 is not inputted into a control part 8, the data of an optical disk 2 are reproduced based on the regenerating signal SR which is outputted form the attenuation-amount changing circuit 5 in correspondence with the detected address signal SA. When the regeneration fails, reproduction of the data whose reproduction fails is retried based on the command from a host computer. Thus, the probability of success in data regeneration can be enhanced.

4. 发明专利

JPH0676295A DEVICE FOR DRIVING OPTICAL DISK 失效
公开(公告)号：JPH0676295A
公开(公告)日：1994-03-18
申请号：JP19155791
申请日：1991-07-31
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： ONDA HIROYUKI , MURATA HIDEHIKO , NAGATA TAKUYA , MASHITA TSUGUAKI , YOSHIMOTO KYOSUKE , OZAKI MINORU , FURUKAWA TERUO
IPC分类号： G11B7/00 , G11B7/004
摘要： PURPOSE:To save capacity in a buffer memory storing temporarily recording/ reproducing data in an optical disk and to use it for a data cache. CONSTITUTION:As the buffer memory 19, though a ring buffer divided to areas in plural addresses in the optical disk and capable of accessing circularly, it is realized by a RAM address specified by an address counter 22, and a head address is addressed continuously succeedingly to a final address equivalently. Further, the data is stored in entire areas of the buffer memory 19 by a control part 14 at a reproducing time, and the data is looked-ahead, and a relation between the storage address in the buffer memory 19 and a recording logic address in the optical disk 2 is stored in a logic address control memory 21 previously. At the time of access after a next time, when the data in a sector stored in the buffer memory 19 is requested, the optical disk 2 is not accessed, only the buffer memory is accessed.

5. 发明专利

JPH04206037A OPTICAL DISK APPARATUS 失效
公开(公告)号：JPH04206037A
公开(公告)日：1992-07-28
申请号：JP33753190
申请日：1990-11-30
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： MASHITA TSUGUAKI , ONDA HIROYUKI , NAGATA TAKUYA , MURATA HIDEHIKO , YOSHIMOTO KYOSUKE , KOYANAGI KIMIYUKI , FURUKAWA TERUO
IPC分类号： G11B7/09
摘要： PURPOSE:To prevent errors of recorded information and reproduced information due to a change in an ambient temperature by detecting the ambient temperature at a place wherein an optical disk apparatus is installed and by altering an amount of control on the state of irradiation of a light beam when recording and reproduction instruction signals are not generated for a prescribed time. CONSTITUTION:A detection output of a temperature detector 20 is inputted to a control element 8, and the control element 8 detects an ambient temperature. When a timer T starts time count from a time point of non-generation of instruction signals for recording and reproduction of information and counts a prescribed time, in other words, when the instruction signals are not generated for the prescribed time, the control element 8 judges that the recording and reproduction of the information are not executed, and alters an amount of control for driving a linear motor 1c and an electromagnetic actuator 1d, on the basis of moving average values of offset and gain in the past. When the ambient temperature of a place of installation changes, according to this constitution, an amount of control on the state of irradiation of a light beam is corrected in terms of temperature and thereby errors of recorded information and reproduced information can be prevented.

6. 发明专利

JPH04195734A FOCUS SERVO CIRCUIT 失效
公开(公告)号：JPH04195734A
公开(公告)日：1992-07-15
申请号：JP32390290
申请日：1990-11-26
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： MASHITA TSUGUAKI , ONDA HIROYUKI , NAGATA TAKUYA , YOSHIMOTO KYOSUKE , NAKAJIMA YOSHIKI , ITO OSAMU
IPC分类号： G11B7/085 , G11B7/095
摘要： PURPOSE:To improve the reliability of a focus servo circuit by comparing a measured sum signal level and a predetermined level of a total signal measured theretofore and by forbidding a focus servo operation, when the former level is lower than the predetermined level. CONSTITUTION:An apparatus is equipped with a means 25 for periodically measuring the total signal Y-level of the output of a plurality of light detectors 9 for receiving a reflected light from an optical disc 6 and with a means SW1 for forbidding a control operation performing control so that focusing of light projected on the optical disc 6 is obtained. Also, the apparatus is constituted to forbid the control operation for obtaining focusing when the level of the measured sum signal Y is lower than the predetermined level of a total signal measured theretofore. In this manner, even if the light reflectance of the optical disc 6 varies or the light intensity of light beam projected on the optical disc 6 varies, a focus servo deviation signal can be obtained to sharply improve the reliability of the optical disc drive.

7. 发明专利

JPH04195733A SERVO CIRCUIT OF OPTICAL DISK DEVICE 失效
公开(公告)号：JPH04195733A
公开(公告)日：1992-07-15
申请号：JP32390190
申请日：1990-11-26
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： MASHITA TSUGUAKI , ONDA HIROYUKI , YAMANA KOJI , NAGATA TAKUYA , YOSHIMOTO KYOSUKE , KOYANAGI KIMIYUKI , OGAWA MASAHARU , FURUKAWA TERUO
IPC分类号： G11B7/095
摘要： PURPOSE:To stabilize a servo operation so that the servo operation does not deviate from a predetermined voltage range, by changing the total signal level of the outputs of two light detectors for receiving a reflected light first projected on an optical disk through a level changing part. CONSTITUTION:The difference signal X and total signal Y of the outputs of two light detectors 9 for receiving a reflected light first projected on an optical disc 6 are detected and the total signal Y is inputted to a level changing part 20B. The total signal level outputted from the level changing part 20B is detected by a total signal level detector 21, which inputs its detection output to a controller 22. The controller 22 performs control so that the quantity of change of level of the level-changing part 20B is changed according to the inputted detection output. The difference signal of the output of the light detector 9 is normalized by the total signal outputted from the level-changing part 20B and the focusing or track position of the projected light is controlled by the normalized difference signal. Thus, the total signal level outputted from the level-changing part does not deviate from the allowable input voltage range of an analog divider 15 so that a servo operation is stabilized.

8. 发明专利

JPH04141864A INFORMATION STORAGE DEVICE 失效
公开(公告)号：JPH04141864A
公开(公告)日：1992-05-15
申请号：JP26355590
申请日：1990-10-01
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： NAKANE KAZUHIKO , YOSHIMOTO KYOSUKE , KIYOSE YASUHIRO , FURUKAWA TERUO , MASHITA TSUGUAKI , ONDA HIROYUKI , MURATA HIDEHIKO , NAGATA TAKUYA
IPC分类号： G11B20/04 , G11B7/00 , G11B7/0045 , G11B7/005 , G11B7/0055 , G11B7/125 , G11B7/126 , G11B11/105
摘要： PURPOSE:To record and reproduce the recording medium whose characteristics in different by detecting the output signal level of a gain variable means and varying the gain of the gain variable means based on the level of the detected output signal. CONSTITUTION:The detection signal of an optical pickup 1 is inputted to a gain switching circuit 3. It switches the gain in accordance with a control signal from a control circuit 4. It supplies the gain control signal in which the gain of the gain switching circuit 3 is set small to the gain switching circuit 3 in a signal recording period, an erasure period and at the time of reproducing a high reflecting film disk. It supplies a gain control signal in which the gain of the gain switching circuit 3 is set large to the gain switching circuit 3 at the time of reproducing an MO(magneto-optical) film disk. The output signal of the gain switching circuit 3 is supplied to a variable attenuator 5 and it changes an attenuation amount in accordance with an attenuation amount control signal from the control circuit 4. Thus, the optimum output signal level can be obtained even if the disk different in the characteristic is recorded or reproduced.

9. 发明专利

JPH04141829A OPTICAL DISK DRIVING DEVICE 失效
公开(公告)号：JPH04141829A
公开(公告)日：1992-05-15
申请号：JP26355690
申请日：1990-10-01
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： YOSHIMOTO KYOSUKE , KOYANAGI KIMIYUKI , FURUKAWA TERUO , OZAKI MINORU , MASHITA TSUGUAKI , ONDA HIROYUKI , YAMANA KOJI , NAGATA TAKUYA
IPC分类号： G11B7/00 , G11B7/004 , G11B7/005
摘要： PURPOSE:To prevent the damage of optical output by comparing the allowable reproduced light power of an optical disk with the disk reproduced light power of a device and setting a reproduction operation to be an impossible state when output reproduced light power is larger than allowable reproduced light power. CONSTITUTION:A rotation control system 5, a rough motor control system 7, a pickup control system 11 and a signal control system 10 operate by an operation signal from a controller 3. The device reads data on the allowable reproduced light power of the disk, which is formed on the control track of the disk 1, and compares it with the output reproduced light power data of the device, which is previously stored. If the output reproduced light power of the device is larger than the allowable reproduced light power of a disk group 1, all the operations of the device is stopped at that time. If the output reproduced light power is smaller than allowable reproduced light power, there is no influence for the disk 1 and therefore the device is controlled to execute a processing such as reproduction. Thus, it can be prevented that information on the optical disk is damaged by the output reproduced light of the disk.

10. 发明专利

JPH04141832A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH04141832A
公开(公告)日：1992-05-15
申请号：JP26355490
申请日：1990-10-01
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： ITO OSAMU , YOSHIMOTO KYOSUKE , KIYOSE YASUHIRO , NAKANE KAZUHIKO , MASHITA TSUGUAKI , ONDA HIROYUKI , YAMANA KOJI , NAGATA TAKUYA
IPC分类号： G11B7/085 , G11B7/09
摘要： PURPOSE:To simplify a mechanism by seeking an optical pickup in the inner peripheral or outer peripheral direction of an optical disk by means of a prescribed amount when a focus setting is not executed or when the presence or absence of a track groove provided on the optical disk cannot be recognized. CONSTITUTION:In a controller 11, a focus setting means 20 for focus servo is connected to a focus servo system 14 and a tracking setting means 21 for tracking servo is connected to a tracking servo system 15. A groove recognition means 22 recognizes a groove when focus setting completes, and the tracking setting means 21 executes a setting operation. The focus setting means 20 and the groove recognition means 22 operate a seek means 23 so as to seek the optical pickup for the prescribed amount. When the groove is not recognized or when focus setting is not executed, the optical pickup is sought for the prescribed amount and it is repeated or a seek amount is increased. Thus, focus setting is speedily completed without using a detector and the like and the mechanism can be simplified.

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