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1. 发明专利

JPS62285259A MAGNETO-OPTICAL DISK DEVICE 失效
公开(公告)号：JPS62285259A
公开(公告)日：1987-12-11
申请号：JP12758886
申请日：1986-06-02
申请人： JAPAN BROADCASTING CORP , ASAKA CO LTD , NIKON CORP
发明人： TOKUMARU HARUKI , NOMURA TATSUO , YOKOYAMA KATSUYA , ONISHI SHUNICHI , OKABE KOICHI , MIZUNOE KATSUZO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To consecutively reproduce plural events at random without joints by providing a magneto-optical head use for erasure/reproduction and a magneto-optical head used for recording/reproduction so as to specify the arrangement thereby attaining the overwrite of a real time signal. CONSTITUTION:When a 1st magneto-optical head 3a is located at the head of a sector address SA of an optional sector S, a 2nd magneto-optical head 3b is placed at the head of a front gap SG1' in gaps SG1', SG2' before and after the sector address SA' of another sector S'. When the 2nd magneto-optical head 3b is placed at the head of the sector address SA' conversely, the 1st magneto-optical head 3a is placed at the head of the rear gap SG2 in the gaps SG1, SG2 before and after the sector address SA' of the other sector S. Thus, the disk having preceding recording has a new signal in nearly real time immediately and events are reproduced consecutively without timewise section at random one after another at the reproduction.

2. 发明专利

JPS62285258A RECORDING METHOD FOR MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPS62285258A
公开(公告)日：1987-12-11
申请号：JP12758786
申请日：1986-06-02
申请人： JAPAN BROADCASTING CORP , ASAKA CO LTD , NIKON CORP
发明人： TOKUMARU HARUKI , NOMURA TATSUO , YOKOYAMA KATSUYA , ONISHI SHUNICHI , OKABE KOICHI , KIMOTO KIYOSHI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To form a recording pit without secondary distortion on a disk by calculating a laser drive current at an optional radial position and ambient temperature based on a data of a laser drive current at the optimum recording obtained at plural measured positions on the magneto-optical disk. CONSTITUTION:The data for the optimum laser light control by the standard disk and the standard magneto-optical disk device is stored in a standard data ROM1. When a disk is recorded by the disk device at first, the optimum drive current is obtained by repeating the recording/reproduction while the drive current is being changed to obtain an output of optimum laser light at several position with different radio on the disk 12, and the ambient temperature and the disk radius position are stored in a computer 4. The control data is generated from the measurement data and the standard data and stored in a control data NVR16. The control data is used to estimate a required drive current at positions other than the measuring positions and the laser light control is attained depending on the radius position of the disk 12 and the ambient temperature.

3. 发明专利

JPS62209752A PHOTOMAGNETIC DISK DEVICE 失效
公开(公告)号：JPS62209752A
公开(公告)日：1987-09-14
申请号：JP5217886
申请日：1986-03-10
申请人： SHIBASOKU CO LTD , ASAKA CO LTD
发明人： NAKAGAWA SHOZO , ONISHI SHUNICHI , OKABE KOICHI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To simultaneously perform erasing and recording/reproduction and to rewrite a bit of information in real time, by arranging optical systems for the erasing and the recording/reproduction at a ring type magnetic bias head in which magnetic head planes having different polarities is arranged. CONSTITUTION:A ring type magnetic bias head 15 in which magnetic head planes 15a and 15b consisting of different polarities are arranged keeping an interval along the track direction of the rear plane of a photoelectro-magnetic disk D, is provided. An erasing optical system which performs the erasing by projecting a light spot on a plane corresponding to the position of the head plane 15a, and magnetizing the plane in one direction, and a recording/ reproducing optical system which performs the recording by projecting a recording spot modulated with the bit of information on the plane corresponding to the position of the head 15b, are provided. In this way, the erasing and the recording/reproduction can b performed simultaneously with one optical head, and the rewriting of the bit of information can be performed in real time.

4. 发明专利

JPH02304722A TRACKING ERROR DETECTING PART FOR MULTI-BEAM OPTICAL DISK DEVICE 失效
公开(公告)号：JPH02304722A
公开(公告)日：1990-12-18
申请号：JP12550489
申请日：1989-05-18
申请人： ASAKA CO LTD
发明人： HAYASHI AKIO , OKABE KOICHI , NAKAGAWA SHOZO
IPC分类号： G11B7/09 , G11B7/135 , G11B7/14 , G11B7/24
摘要： PURPOSE:To simultaneously and parallelly execute recording or reproducing on plural recording tracks with plural optical beam spots by forming the recording tracks on an optical disk corresponding to one light beam nearest to the center of an optical axis to be grooves and obtaining a tracking error signal with reflected light, etc., from the groove. CONSTITUTION:Out of the four tracks to simultaneously execute recording and reproducing on an optical disk 21, only one track is made coincident with a groove 21d. Namely, the groove 21d is irradiated with a beam spot B nearest to the center of the optical axis among four beam spots A-D from the optical head. Namely, when focus deviation is detected, operation is easily affected by the distortion of an optical system. Accordingly, the beam spot B nearest to the center of the optical axis is used for the detection so that the influence of the distortion can be minimum in all the beam. Then, tracking offset is prevented from being generated and the tracking error signal of satisfactory accuracy can be obtained. Thus, the recording or reproducing can be simultane ously and parallelly executed on the plural recording tracks by the plural optical beam spots.

5. 发明专利

JPH01191332A OPTICAL DISK RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH01191332A
公开(公告)日：1989-08-01
申请号：JP1360388
申请日：1988-01-26
申请人： ASAKA CO LTD
发明人： NAKAGAWA SHOZO , OKABE KOICHI
IPC分类号： G11B7/09 , G11B7/135
摘要： PURPOSE:To stably regenerate a digital signal at high speed to a disk shaped recording medium by using plural optical beam spots and separating an optical head and a signal detecting optical system. CONSTITUTION:An optical disk recording and reproducing device is composed of an optical head 1, which can move on a disk shaped recording medium D to have a spiral shaped channel for tracking, and a fixed recording signal receiv ing part to be optically coupled with this optical head. The optical head 1 is separated from an irradiating optical system to irradiated the plural optical detects a focusing or (and) a tracking error signals from an irradiating optical system, which projects the plural optical beam spots to the recording medium D, and the reflected light or transmitted light of these plural optical beam spots by the magnetic substance medium D and controls focusing or (and) track ing to the recording medium D based on this error signal. Thus, the intensity change of a multi-beam laser light source 3, the ruggedness of the magneto- optical disk D surface or a noise due to mechanical oscillation is remarkably decreased and the plural information can be stably reproduced at the high speed.

6. 发明专利

JPH01124118A OPTICAL DISK RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH01124118A
公开(公告)日：1989-05-17
申请号：JP28148987
申请日：1987-11-07
申请人： ASAKA CO LTD
发明人： NAKAGAWA SHOZO , HAYASHI AKIO , OKABE KOICHI
IPC分类号： G11B7/00 , G11B7/004 , G11B7/09 , G11B7/095 , G11B7/14
摘要： PURPOSE:To simultaneously record and/or reproduce plural digital signals on a disklike recording medium and to enable a high speed processing by projecting plural light beam spots on the disklike recording medium. CONSTITUTION:The projection optical systems 1-4 projecting plural optical beam spots to the optical disk like recording medium D having the groove for spiral tracking, the detection optical systems 7-11 detecting the reflection light or transmission light by the disklike recording medium D of plural optical beam spots and the control means controlling the tracking of the plural optical beam spot based on the detection signal from the detection optical system are provided. The means recording and/or reproducing plural signals simultaneously by projecting plural optical beam spots on the disk like recording medium D is also provided. The optical disk recording/reproducing device enabling to record/reproduce a digital signal at high speed on the disklike recording medium is thus obtd.

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