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1. 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.

2. 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.

3. 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.

4. 发明专利

JPH0491685A MOTOR CONTROLLER 失效
公开(公告)号：JPH0491685A
公开(公告)日：1992-03-25
申请号：JP20786490
申请日：1990-08-06
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： HYO HIROO , MASHITA TSUGUAKI , ONDA HIROYUKI , ENAMI KATSUYA , TAKAHASHI HIROSHI
IPC分类号： H02P1/16
摘要： PURPOSE:To bring revolution instantaneously to the state of stoppage, and to stop a motor in a short time by braking and briving a winding in the direction of reverse rotation up to the time of reverse rotation in response to the number of revolution of the motor. CONSTITUTION:The width of the output pulses of a monostable multivibrator 15 is broadened at the beginning of a stoppage command, and reduced with the lowering of the rotation of a motor 2. When an output from a comparator 14 is used as the trigger of the monostable multivibrator 15 in place of a reference pulse oscillator 19, the frequency of output pulses is also decreased with the lowering of the rotation of the motor 2, and the width of output pulses is also narrowed. A rotational direction detector 4 discriminates the direction of rotation by the phase difference of FGl and FG2, an inversion signal is input to a controller 16 when the direction of rotation is reversed, the controller 16 receives the signal and inputs a motor OFF signal to a driver 10, and the motor 2 is stopped instantaneously.

5. 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.

6. 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.

7. 发明专利

JPH0676306A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0676306A
公开(公告)日：1994-03-18
申请号：JP19155691
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 , NAKAJIMA YOSHIKI , WATANABE SEIO
IPC分类号： G11B7/085
摘要： PURPOSE:To stabilize pull-in operation for focusing in spite of variation of detecting sensitivity of a focus error signal. CONSTITUTION:Data in which a distance between a focus error signal and a position of a condenser lens 2 for an optical disk 3 is previously decided is stored in a table 13a. The focus error signal detected by irradiating light to the optical disk 3 is stored in a RAM 9. Data of the table 13a is corrected based on data of the RAM 9, corrected data is stored in a RAM 14. Data of the RAM 14 is given to a speed control circuit 8, an actuator 12 is driven in accordance with data of the RAM 14, the condenser lens 2 is controlled in speed, and the condenser lens is moved toward the optical disk 3 side.

8. 发明专利

JPH04205974A DISK DRIVING DEVICE 失效
公开(公告)号：JPH04205974A
公开(公告)日：1992-07-28
申请号：JP33637890
申请日：1990-11-30
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： OGAWA MASAHARU , NAKANE KAZUHIKO , KIYOSE YASUHIRO , FURUKAWA TERUO , MASHITA TSUGUAKI , ONDA HIROYUKI , MURATA HIDEHIKO , KOBAYASHI YUTAKA
IPC分类号： G11B21/08
摘要： PURPOSE:To allow the exact execution of a seek action at a high speed by calculating the error up to a target position during the seek action and controlling the seek action according to the calculate error. CONSTITUTION:The seek action is executed by moving a pickup 9 for reading out information from the tracks of a disk 1 from the present position to the target position. A means 3 for calculating the error up to the target position according to the difference from the present position to the target position during the seek action and a means 3 for continuing the seek action by correcting the target position according to the result of the calculation after starting the seek action are provided. Then, the error up to the target position is calculated during the seek action after the start of the seek action and the seek action is controlled according thereto. The seek action is speeded up in this way and the exact seek action is possible.

9. 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.

10. 发明专利

JPH0476857A DISK DEVICE 失效
公开(公告)号：JPH0476857A
公开(公告)日：1992-03-11
申请号：JP19129290
申请日：1990-07-19
申请人： MITSUBISHI ELECTRIC CORP , TEAC CORP
发明人： UMEDA YOSHIAKI , FURUKAWA TERUO , OGAWA MASAHARU , NAKANE KAZUHIKO , MASHITA TSUGUAKI , ARAKI TETSUAKI , ONDA HIROYUKI , SAKAI YOSHIAKI , TSUYUKUCHI YUJI , ENAMI KATSUYA
IPC分类号： G11B19/00 , G11B7/0037 , G11B11/105 , G11B19/16
摘要： PURPOSE:To reduce energy consumption by providing a function stop means to stop one of plural functions, and an operation control means to control the operation of the function stop means. CONSTITUTION:When the operation command of recording or reproducing is outputted from a host computer 2, an operation mode 5 is executed and when the operation is completed, the mode is returned to an idle mode 6. At such a time, when a stop command is given from the host computer 2, only an interface with the computer 2 is operated, and the mode is moved to a stop mode 4 for stopping the rotation of a disk 1 and the operation of focusing and tracking. By giving a start command, the stop mode 4 is moved to the idle mode 6. When an eject command is given to eject the disk 1 from the device, an eject operation is executed. When time set in advance passes while maintaining the idle mode 6, a tracking servo is stopped, a disk motor 12 is rotated and the disk 1 is rotated, and the mode is moved to a first save mode 7 to operate a focus servo.

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