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1. 发明专利

JPH0636329A LASER ARRAY PROVIDED WITH POWER CONTROL CIRCUIT 失效
公开(公告)号：JPH0636329A
公开(公告)日：1994-02-10
申请号：JP19043692
申请日：1992-07-17
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SHOJI MAMORU , ISHIDA TAKASHI , FURUYA TADASHIGE , OHARA SHUNJI
IPC分类号： G11B7/125 , H01S5/042 , H01S5/0683 , H01S3/096
摘要： PURPOSE:To accurately control the power of each laser chip of a laser array. CONSTITUTION:When a switch 17b is turned off by a set signal during light emission of laser chips 11a and 11b to stop the light emission of the chip 11b and switches 13a, 20a, and 21a are turned on, the laser beam emitted from the chip 11a is made incident on a PIN diode 12a and is converted to a voltage by a current/voltage converter 14. This voltage is compared with a set voltage 22a by a comparator 15, and the difference voltage is fed back to the optical output of the chip 11a. After this series of servo, the feedback voltage is held in a holding circuit 16a. When switches 13a, 20a, 21a, and 17a are turned off to stop the light emission of the laser chip 11a and switches 13b, 20b, 21b, and 17b are turned on, the laser chip 11b emits light, and the output voltage is held in a holding circuit 16b through the same process as the laser chip 11a. Chips 11a and 11b emit light with the set power when the switch 17a is turned on thereafter.

2. 发明专利

JPH05342170A 失效
公开(公告)号：JPH05342170A
公开(公告)日：1993-12-24
申请号：JP14724692
申请日：1992-06-08
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FURUYA TADASHIGE
IPC分类号： G06F13/00 , G06F15/16 , G06F15/167 , G06F15/177
摘要： PURPOSE:To reduce the overhead time of intermicroprocessor communication and to prevent the control of a master side CPU from being affected by the order of processing at a slave side CPU. CONSTITUTION:A master side CPU 1 outputs special signals and selects RAM a4-b5 corresponding to plural CPU a3-b3 through chip selects 13 and 14. The master side CPU 1 simultaneously writes data through parallel buses to the RAM a4-b5. A slave side CPU a2 selects the RAM a4 through a chip select 7 and reads data from the RAM a4 through the parallel bus. Similarly, the slave side CPU b3 reads data from the RAM b5 through a chip select 9 as well. Thus, communication is simultaneously enabled between the master side CPU 1 and the slave side CPU a2-b3 only at the time of write.

3. 发明专利

JPH05205271A OPTICAL INFORMATION RECORDING METHOD 失效
公开(公告)号：JPH05205271A
公开(公告)日：1993-08-13
申请号：JP975092
申请日：1992-01-23
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ISHIDA TAKASHI , OHARA SHUNJI , FURUYA TADASHIGE
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/0055 , G11B7/125
摘要： PURPOSE:To provide a new recording method in which only reproduction power level and recording power level are required at the time of recording. CONSTITUTION:A pulse beam having width X is radiated with recording power Pw during recording periods P1, P2, P3 for forming recording marks and a pulse beam having width Y (Y

4. 发明专利

JPH0354728A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0354728A
公开(公告)日：1991-03-08
申请号：JP19100489
申请日：1989-07-24
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ISHIBASHI KENZO , FURUYA TADASHIGE , ISHIDA TAKASHI , OHARA SHUNJI
IPC分类号： G11B7/00 , G11B7/004 , G11B19/02
摘要： PURPOSE:To prevent the heat destruction of an optical disk from the heating of an optical head by providing an abnormality detecting means and an abnormality processing means which stops all operation controls except for the motor to rotate the optical disk when there is an abnormality in operation. CONSTITUTION:An abnormality detection part 13 outputs the operation abnormality of a focus and tracking control part 6 as a servo abnormality signal 15, and outputs other operation abnormalities as a drive abnormality signal 14. And an OR gate 19, which outputs an abnormality signal 17 when the servo abnormality signal 15, the abnormal drive signal 14, or an ejection requirement signal 16 is true, stops the operation of a recording and reproducing part 5 and the focus and tracking control part 6 when the abnormality signal 17 is true, and informs a system controller 8 of the abnormalities or ejection requirements. A motor drive part 3 stops the rotational operation of a motor 2 when an abnormality signal 18, operated logically by a composite gate 20 and an OR gate 21, is true. Thus, the heat destruction of the optical disk by the heating of an actuator is prevented.

5. 发明专利

JPH0341622A OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0341622A
公开(公告)日：1991-02-22
申请号：JP17582389
申请日：1989-07-07
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： OHARA SHUNJI , ISHIDA TAKASHI , ISHIBASHI KENZO , FURUYA TADASHIGE
IPC分类号： G11B7/00 , G11B7/005
摘要： PURPOSE:To increase the recording density with simple optical disk constitution by providing plural light spots arranged at intervals of approximately 1/2 of a track pitch between signal tracks, amplifiers for amplifying regenerative signals and adders for adding the signals. CONSTITUTION:Three light sports S1-S3 are arranged with the pitch p/2 and spaces L1 and L2 respectively on the signal tracks T1-T3. Then, the regenerative signals R1-R3 are outputted by photodetectors C1-C3 for detecting the regenera tive signals of the spots S1-S3, and are corrected in their time lag due to the light spot intervals by delay circuits 1-3, so that all the light spots can be regen erated with the same timing. Consequently, these are amplified by the amplifiers G11-G33, and their outputs are inputted to the adders, so that data D1-D3 on the signal tracks T1-T3 can independently be reproduced from the regenerative signals R1-R3. By this method, the recording density can be increased without providing any particular wavelength separation film, etc., on a disk.

6. 发明专利

JPH05342767A 失效
公开(公告)号：JPH05342767A
公开(公告)日：1993-12-24
申请号：JP15470792
申请日：1992-06-15
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： OHARA SHUNJI , ISHIDA TAKASHI , FURUYA TADASHIGE , SHOJI MAMORU
IPC分类号： G11B20/12
摘要： PURPOSE:To provide an optical disc which facilitates the reading of address information at any radial position even in an MCAV type optical disc with a different transfer rate in a radial direction. CONSTITUTION:A transfer rate of an address part is fixed according to radius while the transfer rate of a data part is made variable. To be more specific, a data sink signal DSo2 and user data information DTo2 of an outer circumference part are recorded at a transfer rate higher than that of the DSi2 and DTi2 of the inner circumference part and an address sink signal ASo2 and address information ADo2 of the outer circumference part are recorded at the same transfer rate to the ASi2 and ADi2 of the inner circumference part.

7. 发明专利

JPH0358332A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0358332A
公开(公告)日：1991-03-13
申请号：JP19296389
申请日：1989-07-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ISHIBASHI KENZO , FURUYA TADASHIGE , ISHIDA TAKASHI , OHARA SHUNJI
IPC分类号： G11B7/125
摘要： PURPOSE:To improve reliability by providing a control circuit which sets a reproducing or recording level when a start-up signal is true and sets a zero level when it is false. CONSTITUTION:A semiconductor control circuit sets the optical power output of a semiconductor laser 1 irradiating an optical disk to the reproducing or recording level corresponding to a power control signal group when the start-up signal is true. Also, the circuit sets the zero level in spite of the truth/falsehood of the power control signal group when it is false. By providing such control circuit, an abnormal operation with respect to optical power control can be prevented performed.

8. 发明专利

JPH0341684A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0341684A
公开(公告)日：1991-02-22
申请号：JP17591089
申请日：1989-07-07
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FURUYA TADASHIGE , ISHIDA TAKASHI , ISHIBASHI KENZO , OHARA SHUNJI
IPC分类号： G06F3/08 , G11B7/085 , G11B27/10
摘要： PURPOSE:To allow a signal control processor to use a servo control processor for independent address transmission and address read by invalidating an address stored in an address buffer means at the specific position of each sector based on the timing of address reproduction of the address reproducing means. CONSTITUTION:A signal control processor 7 stores an address to an address buffer 6, an address reproduction section 4 sets an address invalid signal at a sector head position to clear the address stored in the address buffer 6 periodically. Thus, when an address read by a servo signal processor 5 is valid, the address buffer 6 always represents the address of a current position. Then the servo control processor 5 sends an RD signal 24 to the address buffer 6 to read the address through an address bus 23. Thus, the servo control processor 5 reads the address from the address buffer 6 in an optional timing independently of the signal control processor 7.

9. 发明专利

JPH02141977A RECORDING PULSE GENERATOR 失效
公开(公告)号：JPH02141977A
公开(公告)日：1990-05-31
申请号：JP29385788
申请日：1988-11-21
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ITOU MOTOYUKI , ISHIBASHI KENZO , FURUYA TADASHIGE
IPC分类号： G11B20/16 , F02B75/02
摘要： PURPOSE:To inexpensively generate a modulated signal having an accurate pulse width and an accurate pulse separation by providing a difference gate, obtaining the OR between NRZ recorded data and delay data, and pulsating the edge of the NRZ recorded data. CONSTITUTION:NRZ recorded data 2 and a recording clock 3 having the 1/2 cycle of the transfer cycle of the data 2 are inputted to the title device, and a D-type FF 5 samples the data 2 by the clock 3 and outputs delay data 16. Further, a D-type FF 6 further delays the data 16 by one cycle of the clock 3 and outputs delay data 17. The data 16 and 17 are inputted to a selector 7 and selected by a control signal 8, and selected delay data 18 are outputted from the selector 7. Here, a difference gate 23 obtains the OR between the data 2 and 18 and converts the edge of the data 2 into a PMP signal 25. Further, sampling is executed by a clock 16, and a pulse signal 26 having the accurate pulse width and the accurate pulse separation can be obtained inexpensively.

10. 发明专利

JPH01122074A DATA RECORDING METHOD 失效
公开(公告)号：JPH01122074A
公开(公告)日：1989-05-15
申请号：JP28120387
申请日：1987-11-06
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FURUYA TADASHIGE , ISHIBASHI KENZO , KUBOTA SHINJI
IPC分类号： G11B27/00 , G11B20/10
摘要： PURPOSE:To shorten access time to a recording block, and to substitute the recording block as a unit block by tracing only address information recorded in a substituted control area. CONSTITUTION:The set of the substituted control sensor 1 of a data recording system is made to be set 4 of the substituted sector, and the address information of a number of times control sector 2 and the number of times of rewrite information of the control sector 1 are recorded in the control sector 1. Besides, the head address of a data recording area 3 and the number of times of rewrite information of the area 3 are recorded in the number of times control sector 2. Then, the address information of the unused area 3 is sought from the set of the data recording area, and the unused sector 2 is sought from the set 5 of the number of times control sector, and when all the respective ones are used, the recording of data is suspended. Besides, in the case of the rewrite of the data of the area 3, the address information and the number of times of rewrite, recorded in the control sector 1, are found out, and the address of the area 3 is sought, and when it is used one, processing is suspended, and when unused, the data of the area 3 is rewritten.

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