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1. 发明专利

JPH0295192A ROTATION CONTROL CIRCUIT FOR HALL MOTOR 失效
公开(公告)号：JPH0295192A
公开(公告)日：1990-04-05
申请号：JP24228288
申请日：1988-09-29
申请人： SONY CORP
发明人： SHIROICHI YOSHIRO
IPC分类号： H02P6/10 , G11B19/28 , H02P6/06 , H02P6/08 , H02P6/17
摘要： PURPOSE:To apply stable rotational servo by providing a counter means reset by a detecting signal output from a Hall element and injecting rotational nonuniformity information corresponding to one revolution acquired from the counter means into the servo-loop on a driver circuit. CONSTITUTION:A means 31 obtaining detecting signals corresponding to the rotational magnetic field of a rotor magnet 20A detected from Hall elements H1-H3 and means 34A, 34B inputting an output from the detecting means 31 to a counter means 33, arithmetically operating rotational nonuniformity information from the count value of the counter means 33 and storing rotational nonuniformity information corresponding to at least one revolution are provided. A control means 34 inputting rotational nonuniformity information to a speed servo-circuit 10 while being synchronized with the rotational phase of the rotor magnet from the storage means 34A is furnished. Accordingly, the output signals of the Hall elements H1-H3 are injected to the servo-circuit as FG signals, and a servo system controlling speed while suppressing rotational nonuniformity can be constructed, thus stabilizing the operation of the servo system.

2. 发明专利

JPS5922988B2 失效
公开(公告)号：JPS5922988B2
公开(公告)日：1984-05-30
申请号：JP10186776
申请日：1976-08-26
申请人： SONY CORP
发明人： SHIROICHI YOSHIRO
IPC分类号： G06G7/20

3. 发明专利

JPH09212938A MAGNETO-OPTICAL RECORDING APPARATUS 失效
公开(公告)号：JPH09212938A
公开(公告)日：1997-08-15
申请号：JP1595896
申请日：1996-01-31
申请人： SONY CORP
发明人： TOYODA KIYOSHI , SHIROICHI YOSHIRO , ABIKO TORU
IPC分类号： G11B11/10 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To obtain an apparatus in which an error due to the jitters is not generated in a reproducing operation and which can record a good information signal by a method wherein a semiconductor laser and a light-emitting-output control circuit are provided and the servo band of the light-emitting-output control circuit is specified. SOLUTION: A reference voltage VR is supplied, via a resistance R1 having a prescribed resistance value, to the inverting input terminal (-) of a comparator IC1. The inverting input terminal (-) of the comparator IC1 is connected, via a capacitor C1, to the output terminal of the comparator IC1, and it is connected, via a resistance R4, to the output terminal of the comparator IC1. A prescribed voltage is supplied to the noninverting terminal (+) of the comparator IC1 via a photodiode PD for a front APC, and the noninverting terminal is grounded via a resistance R3. The output terminal of the comparator IC1 is connected, via a resistance R5 having a prescribed resistance value, to the base terminal of a PNP transistor TR1.

4. 发明专利

JPH03156774A CLOCK DETECTION SYSTEM FOR OPTICAL DISK 失效
公开(公告)号：JPH03156774A
公开(公告)日：1991-07-04
申请号：JP29514189
申请日：1989-11-15
申请人： SONY CORP
发明人： SHIROICHI YOSHIRO
IPC分类号： G11B20/14 , G11B7/00 , G11B7/005
摘要： PURPOSE:To generate an accurate channel clock with no adjustment by sampling a signal obtained from a couple of wobbling pits and detecting a phase error from a data of a sample point so as to control a voltage controlled oscillator. CONSTITUTION:A digital signal converted from a reproduction RF data read from an optical disk is sampled by an output of a voltage controlled oscillator 18 to form a digital phase comparison means detecting a phase difference between wobbling pits P1,P2 and the channel clock. The phase comparison means controls the oscillated phase of the voltage controlled oscillator 18. Thus, the effect of the temperature is made almost zero. Thus, the accurate channel clock is generated with almost no adjustment.

5. 发明专利

JPH0135426B2 失效
公开(公告)号：JPH0135426B2
公开(公告)日：1989-07-25
申请号：JP10332080
申请日：1980-07-28
申请人： SONY CORP
发明人： YOKOTA TETSUPEI , SHIROICHI YOSHIRO
IPC分类号： H03M5/14 , G11B20/10 , G11B20/12 , G11B20/14 , G11B20/18 , H03M13/27 , H04B14/00

6. 发明专利

JPH0636458A RECORDING PULSE GENERATING CIRCUIT 失效
公开(公告)号：JPH0636458A
公开(公告)日：1994-02-10
申请号：JP21338092
申请日：1992-07-17
申请人： SONY CORP
发明人： SHIROICHI YOSHIRO
IPC分类号： G11B20/10
摘要： PURPOSE:To continuously vary the amount of delay and to realize a cheap device. CONSTITUTION:A clock duty is controlled to a prescribed value by a clock duty control circuit 41 corresponding to a reference voltage set by setting circuit 42. A clock generated by the clock duty control circuit 41 is supplied to a modulator 3 and a NOR circuit 32. The modulator 3 modulates recorded data based on this clock. The modulated data is inverted by an inverter 31 and then supplied to the NOR circuit 32. The NOR circuit 32 calculates the NOR of the inputted data from the inverter 31 and the clock supplied from the clock duty control circuit 41. After the calculated output is delayed by a prescribed time through a delay line 33, is supplied to one of the inputs of an AND circuit 35 through the inverter 34. The output of the NOR circuit 32 is directly supplied to the other input of the AND circuit 35. The AND circuit 35 calculates and outputs the AND of both inputs.

7. 发明专利

JPH0437632B2 失效
公开(公告)号：JPH0437632B2
公开(公告)日：1992-06-19
申请号：JP10347482
申请日：1982-06-16
申请人： SONY CORP
发明人： YOKOTA TETSUPEI , SHIROICHI YOSHIRO
IPC分类号： H04N5/91 , H04N5/765 , H04N5/781 , H04N5/93

8. 发明专利

JPS5953607B2 失效
公开(公告)号：JPS5953607B2
公开(公告)日：1984-12-26
申请号：JP15490177
申请日：1977-12-22
申请人： SONY CORP
发明人： SHIROICHI YOSHIRO , NAITO NORIAKI , UMEDA KENKICHI
IPC分类号： H04B1/62 , G11B20/04 , H04B1/10

9. 发明专利

JPH06223394A BIAXIAL ACTUATOR 失效
公开(公告)号：JPH06223394A
公开(公告)日：1994-08-12
申请号：JP2855293
申请日：1993-01-25
申请人： SONY CORP
发明人： SHIROICHI YOSHIRO , MIWA HIROMITSU
IPC分类号： G11B7/09
摘要： PURPOSE:To obtain a biaxial actuator of which the aseismatic performance is improved without impairing the operation performance. CONSTITUTION:A biaxial actuator 10 is provided with a shaft 13 which is fitted in a bearing 12a and thereby supported slidably in the direction of the central axis of this bearing and rotatably around this central axis and which is pressed against the inner wall of the bearing by a pulling force acting in one direction. The biaxial actuator 10 is so constructed that the clearance C of the shaft 13 from the inner wall of the bearing is 8mum or less.

10. 发明专利

JPH0131329B2 失效
公开(公告)号：JPH0131329B2
公开(公告)日：1989-06-26
申请号：JP10332180
申请日：1980-07-28
申请人： SONY CORP
发明人： YOKOTA TETSUPEI , SHIROICHI YOSHIRO
IPC分类号： H03G3/00 , H03G3/02 , H03G3/20 , H03G3/34 , H03K17/13 , H03K17/16

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