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1. 发明专利

JP2002352517A OPTICAL DISK UNIT, METHOD FOR GENERATING CLOCK OF OPTICAL DISK UNIT AND METHOD FOR SETTING LIGHT QUANTITY OF OPTICAL DISK UNIT 失效
公开(公告)号：JP2002352517A
公开(公告)日：2002-12-06
申请号：JP2001158240
申请日：2001-05-28
申请人： SONY CORP
发明人： NISHIDA NORIO
IPC分类号： G01R29/02 , G11B7/00 , G11B7/0045 , G11B7/005 , G11B7/125 , G11B7/1267 , G11B20/10 , H03L7/113
摘要： PROBLEM TO BE SOLVED: To provide an optical disk unit which enables OPC(optimum power calibration) processing on a jitter amount criterion using a smaller area than heretofore, a method for generating a clock of the optical disk unit and a method for setting light quantity of the optical disk unit. SOLUTION: A clock WCK for writing-in and a reproduction signal PB switch operating reference to generate a clock PBSK for reproduction, and such switch of operation is carried out when reproduction of data for trial writing is started.

2. 发明专利

JP2000149271A DISK RECORDING MEDIUM, RECORDING DEVICE, AND REPRODUCING DEVICE 失效
公开(公告)号：JP2000149271A
公开(公告)日：2000-05-30
申请号：JP31780098
申请日：1998-11-09
申请人： SONY CORP
发明人： TAKEDA RITSU , KUMAI SATOSHI , MIKAMI TATSURO , UEHARA SHUJI , OKANISHI TOSHIHARU , OGAWA KENJI , NISHIDA NORIO , SATO MASASHI , ISHIKAWA HIDEKI , MUNEKATA KAZUMI , YANAGIMOTO KAORU , MITSUNE NORICHIKA
IPC分类号： G11B7/24 , G11B7/007 , G11B7/26 , G11B19/247 , G11B20/10 , G11B27/19 , G11B27/24 , G11B27/30
摘要： PROBLEM TO BE SOLVED: To enable accurate recording and reproducing clocks to be generated by making constant the line density for the wave number regarding wobbling waveform of a track and forming a rotation angle mark indicating a prescribed rotation angle position of a disk. SOLUTION: Data are recorded while keeping constant line density(CLD), and the number of carrier waves of a wobbling group is assumed to CLD, further, a fine clock mark is added as CAV reference, and record and reproduction being more accurate are aimed at, and the wobbling period of a group is set. First, in adjacent tracks, the phase relation of a wobbling waveform is made so that a rotation angle position to be fixed relation exists. For example, when a rotation angle position of a start point of each rotation track is assumed to be 0 degree (the direction of 12 o'clock of a clock), the phase difference between adjacent tracks is made to have fixed relation at this position 0 degree. Further, a fine clock mark is added to a rotation angle position in fixed relation when phase difference is 0, 180, or 270 degrees.

3. 发明专利

JPH09147437A CLEANING DISK, ITS DISK CARTRIDGE AND MAGNETO-OPTICAL DISK DEVICE 失效
公开(公告)号：JPH09147437A
公开(公告)日：1997-06-06
申请号：JP30484895
申请日：1995-11-22
申请人： SONY CORP
发明人： NISHIDA NORIO , FUJITA GORO
IPC分类号： G11B23/00 , G11B11/10 , G11B11/105 , G11B23/50
摘要： PROBLEM TO BE SOLVED: To provide a cleaning disk capable of cleaning a slide surface of a magnetic field applying head, its disk cartridge and a magneto-optical disk device. SOLUTION: This cleaning disk 3B for forming a cleaning layer 310 directly on a surface of a substrate 210 or the surface of a magnetic recording layer 220 formed on the surface is housed in the cartridge, and the cleaning disk cartridge making its inner wall an adhesive inner wall is inserted into the magneto-optical disk device to be loaded, and the slide surface of the magnetic field applying head is cleaned by the cleaning disk cartridge.

4. 发明专利

JPH0981948A DISK RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH0981948A
公开(公告)日：1997-03-28
申请号：JP26219195
申请日：1995-09-14
申请人： SONY CORP
发明人： NISHIDA NORIO
IPC分类号： G11B11/10 , G11B7/095 , G11B11/105 , G11B19/12
摘要： PROBLEM TO BE SOLVED: To stabilize the eccentricity following-up ability and a disturbance suppression amount and to eliminate dispersion in the criterion in judging between drives and between media by level-correcting a tracking error signal based on respective levels of a first signal when a beam spot of reflected light from a disk passes through on first to third pits formed on respective servo areas of the disk. SOLUTION: A timing generator 25 rises successively at the timing that the sampling data corresponding to a first wobble bit arrives at, based on a clock CLK and a digital RF signal S11, and generates a first timing signal S12A to send it to a first latch circuit 26A. Further, the generator 25 generates successively second and third timing signals S12B, S12C respectively corresponding to an on-track bit and a second wobble bit to send them to respectively corresponding second or third latch circuits 26B, 26C.

5. 发明专利

JPH06314436A DIGITAL DISK DEVICE 失效
公开(公告)号：JPH06314436A
公开(公告)日：1994-11-08
申请号：JP12790893
申请日：1993-04-30
申请人： SONY CORP
发明人： NISHIDA NORIO
IPC分类号： G11B7/007 , G11B7/095
摘要： PURPOSE:To improve accuracy of a tracking control when the tracking is controlled with the use of a servo pattern of a sample format, by using the remaining pit arranged on the track center in the case a defect is generated in the pit for detecting a tracking error signal. CONSTITUTION:In an A/D conversion circuit 17, a reproduced signal is converted to a digital signal making a reference clock as the reference and outputted, and an incorporated counter is driven making the reproduced data and reference clock as the reference with the use of a timing generator 20 to output a latch pulse to latch circuits 21-23. A signal level of the reproduced signal is detected by the circuits 21-23 and stored in a ROM 19 through a digital signal processor 24, and this latched result is arithmetically processed to produce the tracking error signal. After that, this error signal is decomposed to the components of high and low ranges, and each of them is outputted to A/D conversion circuits 25, 26. Thus in the optical disk device 2, the driving circuits 12, 13 are operated in accordance with a frequency response characteristic of an object to be controlled, then the tracking control is ensured.

6. 发明专利

JPH0679378B2 失效
公开(公告)号：JPH0679378B2
公开(公告)日：1994-10-05
申请号：JP29664486
申请日：1986-12-15
申请人： SONY CORP
发明人： EGUCHI NAOYA , NISHIDA NORIO
IPC分类号： G11B7/085 , G11B7/09

7. 发明专利

JPH05342755A 失效
公开(公告)号：JPH05342755A
公开(公告)日：1993-12-24
申请号：JP17615492
申请日：1992-06-10
申请人： SONY CORP
发明人： SHIMIZU YASUNARI , NISHIDA NORIO , KOBAYASHI SHOEI
IPC分类号： G11B7/00 , G11B7/005 , G11B19/247 , G11B19/28 , G11B20/14 , G11B20/18
摘要： PURPOSE:To control the rotation of a magneto-optical disc 1 accurately. CONSTITUTION:A pit detection circuit 5 detects pit information from an RF signal which an optical head 3 outputs reproducing the magneto-optical disc 1. A mirror part detection circuit 6 detects an area (mirror area) in which no pit is formed from the pit information. A pit cycle detection circuit 7 detects a clock pit on the magneto-optical disc 1 from the mirror area detected by the mirror part detection circuit and the pit information detected by the pit detection circuit 5. Then, the cycle of the clock pit is measured and compared with a specified reference value to output an error signal obtained. A rotation control circuit 9 controls a spindle motor 2 corresponding to the error signal.

8. 发明专利

JPH05109218A HEAD POSITION DETECTOR 失效
公开(公告)号：JPH05109218A
公开(公告)日：1993-04-30
申请号：JP29480391
申请日：1991-10-16
申请人： SONY CORP
发明人： NISHIDA NORIO
IPC分类号： G11B21/10
摘要： PURPOSE:To shorten the time required for servo operation and to promote the servo performance on a recording medium making progress of high speed-up and high densification. CONSTITUTION:An output signal from a signal level detecting part 13 for detecting a burst signal written in a servo pattern required for detecting the position of a head (not shown in the figure) is converted into a digital signal by a parallel comparison type A/D converter 14. This signal is stored as an output data in an FIFO memory 15, and is fetched from this FIFO memory 15 to a CPU 16, and the output data is arithmetically processed for the purpose of controlling the position of the head, and is then outputted as a head position control signal via a D/A converter 17 from an output terminal 18.

9. 发明专利

JPH0564483A PWM SIGNAL GENERATING CIRCUIT 失效
公开(公告)号：JPH0564483A
公开(公告)日：1993-03-12
申请号：JP24478291
申请日：1991-08-30
申请人： SONY CORP
发明人： NISHIDA NORIO , SUZUKI YASUAKI
IPC分类号： G11B21/08 , G11B19/28 , H02P7/29
摘要： PURPOSE:To correct mechanical bias force such as recovery force by outputting the pulse period, being employed in the control of variation of time constant, while specifying the update period of control data, i.e., the sampling period, according to the length of the time constant. CONSTITUTION:A PWM signal generating circuit 10 is provided with a first PWM circuit 11 for outputting a first PWM signal in which the pulse period, being employed in the control of short variation of time constant, is equal to the update period of control data, i.e., the sampling period. On the other hand, a second PWM means, i.e., a second PWM circuit 12, for outputting a pulse signal having pulse period, being employed in the control of long time constant variation, sufficiently shorter than the sampling period and suppressing external force, e.g. recovery force, of a flexible board having electrical offsets is provided. A mixing circuit 13 performs addition based on signals being fed from the first and second PWM means.

10. 发明专利

JPH0460960A DISK DRIVE DEVICE 失效
公开(公告)号：JPH0460960A
公开(公告)日：1992-02-26
申请号：JP16811590
申请日：1990-06-26
申请人： SONY CORP
发明人： NISHIDA NORIO , YAMASHITA YOSHIHIDE
IPC分类号： G11B19/28
摘要： PURPOSE:To enable servo control with high accuracy by controlling the speed of a spindle motor based on error between a count value sampling the output of a counter and a prescribed reference value according to either the rotation detecting output of the spindle motor or the regenerative output of sector pulses recorded on a disk at prescribed intervals. CONSTITUTION:A counter 9 counts a clock signal as a continuous value and in a stage when the rotation of a spindle motor 7 starts, the output of the counter 9 is sampled by the rotation detecting output of the spindle motor 7. In the state of sufficiently starting the rotation of the spindle motor 7 and making it stable, the output of the counter 9 is sampled according to the regenerative output of sector pulses recorded on a disk 1 at prescribed intervals. Next, difference between the outputs of the counter 9 at the timings of two adjacent samplings is calculated and based on error formed by comparing the difference of this count value with a reference count value, the rotating speed of the spindle motor 7 is controlled. Thus, servo control is enabled with high accuracy.

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