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1. 发明专利

JPH11134663A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH11134663A
公开(公告)日：1999-05-21
申请号：JP25010398
申请日：1998-09-03
申请人： TEAC 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： PROBLEM TO BE SOLVED: To correctly control the irradiating state of a light beam by controlling the irradiating state of the light beam while reading out stored controller variables every time a temp. detection result reaches a prescribed temp. range or a temp. change reaches a prescribed value to make a storage capacity small. SOLUTION: When command signals to be applied to the driving circuits 13, 14 of a linear motor IC and an electromagnetic actuator 1d are not generated for a prescribed time a control circuit 8 judges that the recording and reproducing of information is not present and it reads out respective values of stored offsets and gains till then from a memory 15. Then, it sets these offset values and gain values every prescribed temp. range or every time the temp. change reaches a prescribed temp. to preliminarily store them in the memory 15 and it reads out an offset value and an gain value corresponding to a detected temp. at the time of changing an offset and an gain to change them. Then, when an ambient temp. is changed, the circuit 8 is changed to controlled variables related to its ambient temps. and the light beam is subjected to a tracking control and, then, the proper tracking control of the light beam is performed without being affected by the change in ambient temps.

2. 发明专利

JPH05314496A OPTICAL DISK APPARATUS 失效
公开(公告)号：JPH05314496A
公开(公告)日：1993-11-26
申请号：JP7117792
申请日：1992-03-27
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： MORITA TSUTOMU , ONDA HIROYUKI , KOYANAGI KIMIYUKI , YOSHIMOTO KYOSUKE
IPC分类号： G11B7/085 , G11B7/095
摘要： PURPOSE:To properly draw in focus a condenser lens at all times even when noises are superposed to signals by reversing the moving direction of the condenser lens or accelerating the condenser lens in accordance with the photodetecting level, thereby effecting focus servo control of the condenser lens. CONSTITUTION:A CPU 11 detects a peak value A of a sum signal SS of a photodetector 4 from a detecting signal SD from a light amount detector 6. Then, the CPU 11 checks the signal SD and, applies a digital signal to a D/A converter 10 so as to reverse the direction of a triangular current to be fed to a lens driving part 8 and gradually reduce the triangular current when the signal SS is decreased to 1/2 the value A. Accordingly, the moving direction of the condenser lens 3 is reversed to the direction of an optical disk 1 and the moving speed is reduced. When the signal SS becomes not smaller than 1/2 the value A and the difference signal SD reaches a value B, focus servo control is carried out. Thereafter, the lens 3 is moved to hold a predetermined distance from the disk 1 at all times in accordance with the output of a lens controlling part 7 to which a deviation signal is supplied, thereby to continue true control.

3. 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.

4. 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.

5. 发明专利

JPH05342749A 失效
公开(公告)号：JPH05342749A
公开(公告)日：1993-12-24
申请号：JP19155591
申请日：1991-07-31
申请人： TEAC CORP , MITSUBISHI ELECTRIC CORP
发明人： ONDA HIROYUKI , YAMANA KOJI , KOBAYASHI YUTAKA , MASHITA TSUGUAKI , YOSHIMOTO KYOSUKE , ITO OSAMU , TANAKA KUNIMARO
IPC分类号： G11B17/04 , G11B17/043 , G11B19/02 , G11B19/04 , G11B19/06
摘要： PURPOSE:To prevent the deformation of an optical disc housed in an optical disc cartridge. CONSTITUTION:This apparatus is provided with a temperature sensor 11 to detect an ambient temperature of an optical disc-loaded cartridge 3, a timer 121 and an ejection mechanism 4 to eject the optical disc cartridge 3. Then, the timer 121 starts the counting of time from the moment when the temperature sensor 11 detects a specified temperature. When temperature sensor 11 detects the specified temperature at the moment of the time counted reaching a specified value, the ejection mechanism 4 is driven to eject the optical disc cartridge 3.

6. 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.

7. 发明专利

JPH04177678A DISK DRIVER 失效
公开(公告)号：JPH04177678A
公开(公告)日：1992-06-24
申请号：JP30578490
申请日：1990-11-09
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： YOSHIMOTO KYOSUKE , NAKAJIMA YOSHIKI , KOYANAGI KIMIYUKI , ITO OSAMU , MASHITA TSUGUAKI , ONDA HIROYUKI , KOBAYASHI YUTAKA , YAMANA KOJI
IPC分类号： G11B21/08 , G11B7/085
摘要： PURPOSE:To always move detecting means in an optimum state by measuring a moving time of the detecting means by measuring means, and forming a voltage waveform to be applied to driving means based on the measured result of the measuring means by driving voltage generating means. CONSTITUTION:A time t1 from a starting time t0 of a jump command of a predetermined voltage to a time of reaching the intermediate position of the track (time until a tracking error signal zero-crosses through a comparator) is measured. A voltage is so set that the t1 falls within + or - T. When it falls within a predetermined time width, a detecting time T2 is provided after a brake pulse is finished, a tracking error signal is extracted, and a brake pulse voltage is varied each by one stage so as to fall within a predetermined range d1. The range of the error amount is set by the amplitude of the error signal, and the amplitude is extracted from the jump starting time, and measured. An accelerating/decelerating voltage value is obtained, a parameter is decided, and stored in a memory of a controller 3. Then, a jumping operation is rapidly and stably conducted based on the memory.

8. 发明专利

JPH0479080A DISK DRIVE DEVICE 失效
公开(公告)号：JPH0479080A
公开(公告)日：1992-03-12
申请号：JP19248990
申请日：1990-07-20
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： YOSHIMOTO KYOSUKE , FURUKAWA TERUO , OZAKI MINORU , MASHITA TSUGUAKI , ONDA HIROYUKI
IPC分类号： G11B21/08 , G11B19/00 , G11B19/04
摘要： PURPOSE:To suppress the increase of energy consumption and the increase of an inside temperature with a seek operation with high accuracy by stopping the seek operation when time for the seek operation of a head exceeds a threshold value. CONSTITUTION:According to a seek command signal from a controller 2, a linear motor 1 is driven through a linear motor driver 3. On the other hand, this seek command signal is inputted to a time counter 4, and the time for the seek operation is accumulated and counted. The count value of the time counter 4 is outputted to the controller 2 and when the time for the seek operation exceeds the set threshold value, it is latched by a latch 5 so as to transmit a count over output to the controller 2. Then, according to this count over output, the output of the seek command signal is weld in standby for a prescribed time by a seek standby means of the controller 2. Thus, the increase of energy consumption is prevented and the increase of the inside temperature is suppressed.

9. 发明专利

JPH0474353A DISK DRIVING DEVICE 失效
公开(公告)号：JPH0474353A
公开(公告)日：1992-03-09
申请号：JP18743990
申请日：1990-07-16
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： YOSHIMOTO KYOSUKE , FURUKAWA TERUO , OZAKI MINORU , MASHITA TSUGUAKI , ONDA HIROYUKI
IPC分类号： G11B19/04 , G11B7/085 , G11B19/00 , G11B19/02 , G11B21/08
摘要： PURPOSE:To suppress the increase of power consumption and the temperature rise in the device caused by a seek operation by pausing the seek operation in the case the number of times of seek of a head exceeds a threshold, and resetting the threshold based on the number of count in a prescribed period in the case the number of times is below the threshold. CONSTITUTION:The device is provided with a counting means 4 for counting the number of times of seek executed in a prescribed period by a head, a seek holding means 2a for pausing a seek operation of the head for a residual period in a prescribed period, when the count of the counting means 4 exceeds a set prescribed threshold, and a resetting means 2c for changing the threshold of the counting means 4, based on the number of count of the counting means 4 in the period. In such a way, the number of times of the seek operation of the head is limited, and also, the seek is executed efficiently within an allowable range in the device, and an increase of power consumption and a temperature rise in the device caused by the seek operation can be suppressed.

10. 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.

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