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1. 发明专利

JPH05151753A MAGNETO-OPTICAL DISK DEVICE 失效
公开(公告)号：JPH05151753A
公开(公告)日：1993-06-18
申请号：JP31615391
申请日：1991-11-29
申请人： COPAL CO LTD , FUJITSU LTD
发明人： TAKAHASHI MITSUO , ASAKO KOJI , KAGEYAMA KAZUHIKO , SATO YOSHIHIRO , ARAI SHIGERU
IPC分类号： G11B25/04 , G11B17/04 , G11B17/043
摘要： PURPOSE:To obtain a small-sized and thin device by providing a motor assembled body fixing a spindle motor movably and vertically in a direction intersecting orthogonally with the inserting direction of a cartridge. CONSTITUTION:The motor assembled body 2 is constituted of a moving member 13 fixing a spindle motor 10 and having plural projecting parts 17 on both side surfaces. An abutting condition between the head part 18a of an arm 18 and a slide member 16k is released since the arm 18 is rotated in the direction of the arrow Q1 by an insertion tip face when the cartridge 100 is inserted and a sliding plate 16 is moved in the direction of the arrow P4 by the pulling action of a spring 14 in the state of being stretched. Thus, the moving member 13 is moved in the direction of the arrow P1 since respective projecting parts 17 are moved downward along a inclined groove 16b and the spindle motor 10 for driving a disk is chucked to the disk 120 and chucking is ended. Further, ejection is performed by using an ejection motor assembled body.

2. 发明专利

JP2001067812A OPTICAL RECORDING MEDIUM, DETECTING METHOD FOR DATA- BLOCK DISCRIMINATION MARK AND OPTICAL STORAGE DEVICE 失效
公开(公告)号：JP2001067812A
公开(公告)日：2001-03-16
申请号：JP2000054880
申请日：2000-02-29
申请人： FUJITSU LTD
发明人： NISHIMOTO HIDEKI , MORIMOTO YASUAKI , ARAI SHIGERU , NUMATA TAKEHIKO , YANAGI SHIGETOMO , AOKI JUN
IPC分类号： G11B20/12 , G11B7/005 , G11B7/007 , G11B7/013 , G11B7/09 , G11B7/30 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To prevent the erroneous detection of a data-block discrimination mark by a method wherein lands and grooves which are arranged on a substrate alternately along a prescribed direction are provided, data recording regions which are formed in the lands and the grooves are provided, and sector-mark recording regions which are formed in one out of the lands and the grooves and in which data-block discrimination mark are recorded are provided. SOLUTION: A substrate material is formed of a glass or a polycarbonate. Lands 901 and grooves 902 are arranged alternately in the radial direction of a disk. Sector marks 903 whose height is nearly identical to that of the lands are formed in parts in which the grooves are not engraved partially. The sector marks 903 can be used in common for both the lands and the grooves. In the grooves, a quantity of light returned to a photodetector is changed sequentially in shaded parts 905 in the grooves and in shaded parts 906 in the lands so as to be detected as the sector marks.

3. 发明专利

JPH0748257B2 失效
公开(公告)号：JPH0748257B2
公开(公告)日：1995-05-24
申请号：JP11204787
申请日：1987-05-07
申请人： FUJITSU LTD
发明人： KATSUHARA WATARU , ARAI SHIGERU
IPC分类号： G11B7/085 , G11B21/08

4. 发明专利

JPH051533B2 失效
公开(公告)号：JPH051533B2
公开(公告)日：1993-01-08
申请号：JP1802485
申请日：1985-01-31
申请人： FUJITSU LTD
发明人： ARAI SHIGERU , IWAMOTO TOSHITAKA
IPC分类号： G11B7/09 , G02B7/00 , G11B7/095

5. 发明专利

JPH0443329B2 失效
公开(公告)号：JPH0443329B2
公开(公告)日：1992-07-16
申请号：JP1803585
申请日：1985-01-31
申请人： FUJITSU LTD
发明人： ARAI SHIGERU
IPC分类号： G02B7/28 , G11B7/09 , G11B7/135

6. 发明专利

JPH0366030A OPTICAL RECORDING AND READING DEVICE 失效
公开(公告)号：JPH0366030A
公开(公告)日：1991-03-20
申请号：JP20298789
申请日：1989-08-04
申请人： FUJITSU LTD
发明人： SAITO HIDENORI , ARAI SHIGERU
IPC分类号： G11B11/10 , G11B7/09 , G11B11/105
摘要： PURPOSE:To reduce a DC offset and to improve the tracking accuracy by setting the positioning of a photodetector part to the center of a central track placed between outermost and innermost circumferential tracks symmetrically. CONSTITUTION:A center track placed between an inner track and an outer track of a recording area of an optical disk 10 is selected to a reference track to which a two-split photodetector 14 is set and positioned. While the center track is irradiated with a beam spot from an optical head 12, the position of a mount base of the photodetector 14 is adjusted so that two photodetectors are made symmetrical with respect to the center of the center track. Thus, while the DC offset of a tracking error signal is minimized, the tracking accuracy at high speed access is improved.

7. 发明专利

JPH0212617A FOCUS OFFSET REGULATING SYSTEM 失效
公开(公告)号：JPH0212617A
公开(公告)日：1990-01-17
申请号：JP16231188
申请日：1988-06-29
申请人： FUJITSU LTD
发明人： YANAGI SHIGETOMO , MINAMI AKIRA , SASAKI MASATERU , ARAI SHIGERU , IWAMOTO TOSHITAKA , SAITO HIDENORI
IPC分类号： G02B7/28 , G11B7/09
摘要： PURPOSE:To always attain an optimum focus position control by detecting a focus offset value at which the amplitude of the RF signal of plural received signals received by an optical head is maximum, adding it to a focus servo control part, and servo-controlling the focus position. CONSTITUTION:A track servo control part 3 controls track tracing based on a track error signal. A focus servo control part 4 controls the focus position based on a focus error signal and the focus offset value. Further, a sum signal amplitude detecting part 5 detects the sum amplitude of the amplitude (RF) signals of the read signals of the plural received signals received by an optical head 2, and applies the focus offset value at which the amplitude is maximum to the focus servo control part 4. Thus, even when astigmatism is generated, the optimum focus position control is attained.

8. 发明专利

JPS63171432A MULTI-TRACK JUMP SYSTEM 失效
公开(公告)号：JPS63171432A
公开(公告)日：1988-07-15
申请号：JP280487
申请日：1987-01-08
申请人： FUJITSU LTD
发明人： KATSUHARA WATARU , ARAI SHIGERU
IPC分类号： G11B7/085 , G11B21/08
摘要： PURPOSE:To attain stable track jump without being affected by the eccentricity of an optical disk by adding a means detecting the moving acceleration of a track so as to detect the acceleration caused by the eccentricity of the optical disk. CONSTITUTION:An acceleration detecting circuit 12 being a means detecting the moving acceleration of a track is added to an optical head actuator 2. An output of the detection circuit 12 is fed to a control circuit 10. Then the control circuit 10 receives the acceleration being the output of the detection circuit 12 to control a voltage application circuit 8 thereby outputting an acceleration/deceleration pulse in response to the acceleration and jump track number. Thus, stable track jump is applied without being affected by the eccentricity of the optical disk.

9. 发明专利

JPS63142533A OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS63142533A
公开(公告)日：1988-06-14
申请号：JP28954986
申请日：1986-12-03
申请人： FUJITSU LTD
发明人： ARAI SHIGERU
IPC分类号： G11B7/085 , G11B7/09 , G11B7/095
摘要： PURPOSE:To execute a tracking control with high accuracy by calculating a sample holding output difference which is formed based on a detection of a reflected light by a preformat part and its just before pre-group part and detecting a track shift. CONSTITUTION:A first signal level extracting means 6 extracts an average output level of a tracking error signal when an optical spot is radiating a prescribed position of a preformat part. Also, a second signal level extracting means 7 extracts an output level of an error signal when the spot is radiating a pre-group part just before the preformat part. When a track shift is generated, a difference is generated in this output level, a track shift detecting means 8 calculates a difference of the output level, and by its difference output, an off-track quantity and its direction are detected and displayed. In such a way, an optical axis shift is monitored easily, and an alignment can be executed with high accuracy.

10. 发明专利

JPS62285242A OPTICAL HEAD ACTUATOR 失效
公开(公告)号：JPS62285242A
公开(公告)日：1987-12-11
申请号：JP12982286
申请日：1986-06-03
申请人： FUJITSU LTD
发明人： IWAMOTO TOSHITAKA , ARAI SHIGERU
IPC分类号： G11B7/09 , G02B26/10
摘要： PURPOSE:To attain a track access without optical axis deviation by adopting a constitution so that a 1st actuator and a 2nd actuator are combined so as to allow an optical beam incident on a reflecting mirror via a scanning mirror to pass through the rear focus of the objective lens. CONSTITUTION:The titled actuator consists of the 1st actuator incorporating a means detecting the drive quantity of an objective lens 3 and the 2nd actuator 2 comparing the track access quantity (a) (drive quantity of objective lens) of the 1st actuator with a track access quantity (b) (turning quantity of reflecting face) of the 2nd actuator itself and moving in a way that the ratio (a/b) is always constant. That is, the 2nd actuator 2 compares the track access quantity (b) of itself with a value Ka being the multiplication of a constant K deciding the interlocking ratio of both the actuators wit the track access quantity (a) of the 1st actuator 1 and moves so that the ratio (a/b) is always constant. Thus, the optical axis of the light beam 7 passes through the rear focus of the objective lens 3 at all times.

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