公开(公告)号：JPH05135423A

公开(公告)日：1993-06-01

申请号：JP32381291

申请日：1991-11-12

Applicant: SONY CORP

Inventor： SATO MASASHI

IPC: G11B11/10 ,  G11B11/105 ,  G11B21/21

Abstract: PURPOSE:To simplify a servo mechanism controlling the distance between a magnetic head and a disk in a magneto-optical disk recording and reproducing device. CONSTITUTION:An optical head 2 and a magnetic head 3 disposed to opposed to the magneto-optical disk 1 are connected in one body by a supporting member 9. The supporting member 9 is slid in the direction along a shaft 11 by a motor 15 as an actuator. The motor 15 is driven by a focus error signal which is generated in a focus servo circuit 24 and corresponding to the distance between the optical head 2 and the magneto-optical disk 1. By this constitution, the magnetic head 3 is positioned so as to take a specified distance to the magneto- optical disk 1 without providing a special gap sensor or a servo circuit.

公开(公告)号：JPH0589472A

公开(公告)日：1993-04-09

申请号：JP25198591

申请日：1991-09-30

Applicant: SONY CORP

Inventor： WACHI SHIGEAKI ,  KOBAYASHI SHOEI ,  SUMIHIRO HIROSHI ,  SATO MASASHI

IPC: G11B7/00 ,  G11B7/005 ,  G11B7/125

Abstract: PURPOSE:To stabilize the operation of a servo system by eliminating the influence of the unevenness of reflection or the change of spatial frequency characteristic of an optical disk in an optical disk device. CONSTITUTION:A pair of regenerative RF signals S32, S33 for forming a tracking control signal Stk are obtained from the reflected light receiving element 13 of an optical head 13 10R, and simultaneously, a power level control signal is formed on the basis of a sum signal Ssm formed by adding these regenerative RF signals, and the power level of a light beam from a laser light source 11 is controlled.

公开(公告)号：JPH04276324A

公开(公告)日：1992-10-01

申请号：JP6264791

申请日：1991-03-04

Applicant: SONY CORP

Inventor： SATO MASASHI

IPC: G11B7/00 ,  G11B7/005 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To attain the miniaturization and weight reduction of the device by detecting a light beam reflected from a recording medium by means of a photodetecting means and controlling an optical generating means so that the DC component of the output of the photodetecting means may be made constant. CONSTITUTION:A laser beam reflected by a disk 7 is reflected by the polarizing face 4a of a beam splitter 4 and made incident on the photodetector 10. By an arithmetic circuit 11, RF signal is generated from the output of the photodetector 10 and is supplied to LPF 12. By LPF 12, the DC component of the RF signal supplied from the arithmetic circuit 11 is extracted and supplied to the noninverted input terminal of a differential amplifier 13. To the noninverted input terminal of the amplifier 13, a reference voltage outputted by a reference voltage generating circuit 14 is supplied, and a difference between the DC component of the RF signal and the reference voltage is outputted from the amplifier 13. The output of the amplifier 13 is supplied to a driving circuit 20, and a semiconductor laser 1 is driven. Thus, the DC component of the RF signal is coincided with the reference voltage.

公开(公告)号：JPH04271023A

公开(公告)日：1992-09-28

申请号：JP7740091

申请日：1991-02-25

Applicant: SONY CORP

Inventor： SATO MASASHI

IPC: G05B9/02 ,  G05D3/12 ,  G11B7/09 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To prevent a head form colliding against a megneto-optical disk. CONSTITUTION:An arithmetic circuit 2 supplies an action signal to 8 control circuit 3 in response to the difference between the target value received from a target value setting circuit 1 and the detection signal received from a detecting circuit 6. An operating circuit 4 turns the operating signal received from the circuit 3 into an operating signal and supplies this signal to an actuator 5 via a switch 12. The actuator 5 drives a heed (not shown in the diagram) to keep a prescribed distance from a megneto-optical disk. Then the circuit 6 detects the distance between the head and the disk and supplies this detection signal to the circuit 2. An abnormality detecting circuit 16 detects the abnormality based on the outputs of both window comparators 14 and 15 and then turns off the switch 12.

公开(公告)号：JP2003059421A

公开(公告)日：2003-02-28

申请号：JP2001246015

申请日：2001-08-14

Applicant: Sony Corp ,  ソニー株式会社

Inventor： IWAKOSHI TOMOYASU ,  NAKAGAWA SHIGEYASU ,  SATO MASASHI

IPC: H01J29/48

Abstract: PROBLEM TO BE SOLVED: To prevent mixing of a foreign matter inside an electron gun, and to prevent the deterioration in a withstand voltage characteristic of a cathode- ray tube in the electron gun provided, for example, in a neck part of the color cathode-ray tube.
SOLUTION: Foreign matter mixing preventive walls 8f and 8g for preventing the mixing of the foreign matter are arranged in an electron beam passing hole 8c of a convergence cup 11 in the electron gun 2 of the cathode-ray tube.
COPYRIGHT: (C)2003,JPO

Abstract translation: 要解决的问题：为了防止电子枪内的杂质的混合，并且防止例如在彩色阴极的颈部中提供的电子枪中阴极射线管的耐电压特性的劣化 射线管。 解决方案：用于防止异物混合的异物混合防止壁8f和8g布置在阴极射线管的电子枪2中的会聚杯11的电子束通过孔8c中。

公开(公告)号：JP2000149271A

公开(公告)日：2000-05-30

申请号：JP31780098

申请日：1998-11-09

Applicant: SONY CORP

Inventor： 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: G11B7/24 ,  G11B7/007 ,  G11B7/26 ,  G11B19/247 ,  G11B20/10 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30

Abstract: 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.

公开(公告)号：JPH11110904A

公开(公告)日：1999-04-23

申请号：JP27237797

申请日：1997-10-06

Applicant: SONY CORP

Inventor： SATO MASASHI ,  KOBAYASHI SHUICHI ,  KAWASHIMA TETSUJI

IPC: G11B19/28

Abstract: PROBLEM TO BE SOLVED: To realize a constant linear velocity(CLV) system optical disk device in which the power consumption is low, vibration is reduced and a high speed access is made possible. SOLUTION: In the CLV system optical disk device, the target linear velocity value, which is normally constant, is controlled to a prescribed value in accordance with the situation. In the case of a random access, at the time just after seeking, the revolving speed of a disk is measured, an actual line velocity corresponding to the revolving speed is set as a temporary target value. Then, the value is gradually increased or decreased until the value reaches to the normal reference value corresponding to a desired address depending on whether a seek direction is the inner peripheral side or the outer peripheral side of the disk.

公开(公告)号：JPH1069733A

公开(公告)日：1998-03-10

申请号：JP24543396

申请日：1996-08-29

Applicant: SONY CORP

Inventor： SATO MASASHI ,  KAWASHIMA TETSUJI

IPC: G11B20/14

Abstract: PROBLEM TO BE SOLVED: To generate a synchronous clock in a short time by making a PLL operation after feeding a prescribed voltage value in accordance with a measured value to the voltage controlled oscillator provided in a PLL circuit and generating the clock synchronized with a reading signal. SOLUTION: Digital voltage information in accordance with the absolute frequency value measured with a frequency measuring instrument 5 from a micro computer 7 is read from a RAM 8 and outputted to a D/A converter 9. An analog voltage VE in accordance with the absolute frequency measured value is outputted to an adder 15 from the converter 9. Also, the voltage of a LPF 14 is discharged with the micro computer 7. Accordingly, the oscillating frequency of a VCO 16 is controlled with the voltage VE outputted from the converter 9, each of the voltages V1 -Vn is set as the voltage value for generating frequencies f1 -fn in the VCO 16, whereby the oscillating frequency of the VCO 16 becomes the frequency near the frequency of an EFM signal read from a disk 1 after seeking.