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1. 发明专利

DE3804701A1 未知
公开(公告)号：DE3804701A1
公开(公告)日：1988-09-29
申请号：DE3804701
申请日：1988-02-15
申请人： HITACHI LTD
发明人： SUGIYAMA HISATAKA , MAEDA TAKESHI , SAITO ATSUSHI , HARA FUMIO
IPC分类号： G11B7/085 , G11B7/09 , G11B7/12 , G11B7/14 , G11B7/095
摘要： In optically coupling a plurality of light sources to an optical system for focusing light beams from the light sources into spots on a record plane, a center axis of a light beam from a first one of the light sources is aligned to an optical axis of the focusing optical system, and the spots other than a first spot formed by the light beam from the first light source are rotated around the first spot on the record plane to position the spots to the respective target tracks, and a tracking error signal for at least one of the first spot and another spot is detected and the positions of the plurality of spots are integrally controlled based on the detected tracking error signal so that the plurality of spots can follow the respective target tracks. The target tracks to which the spots are to be positioned may be either one track or different tracks. The positioning of the spots to the target tracks may be done either manually or automatically. In the automatic method, a tracking error signal is detected for the first spot, and a deflection mechanism for radially swinging beams from the laser light sources is controlled to control the positions of the spots on the record plane and to cause the first spot to follow the target track.

2. 发明专利

JPH0516106B2 失效
公开(公告)号：JPH0516106B2
公开(公告)日：1993-03-03
申请号：JP14104583
申请日：1983-08-03
申请人： HITACHI LTD
发明人： HARA FUMIO , KASAI MASUO , KAKU TOSHIMITSU , SAITO ATSUSHI , TAJIMA TAKESHI , IMAGAWA FUMIO
IPC分类号： F16C32/06 , G05D3/00 , G11B7/085 , G11B21/02 , G11B21/10

3. 发明专利

JPH02128387A OPTICAL RECORDING MEDIUM AND RECORDING AND REPRODUCING DEVICE USING IT 失效
公开(公告)号：JPH02128387A
公开(公告)日：1990-05-16
申请号：JP28032088
申请日：1988-11-08
申请人： HITACHI LTD
发明人： TSUCHINAGA HIROYUKI , HARA FUMIO , MITA SEIICHI , IZUMIDA MORIJI , ETO YOSHIZUMI
IPC分类号： G11B23/07 , G11B7/00 , G11B7/003 , G11B7/24 , G11B15/32 , G11B25/06
摘要： PURPOSE:To house a tape which is an optical recording medium in a small area by coaxially and rotatably housing one reel which simultaneously feeds and takes up the tape in a rotary drum and running the tape, with part of the tape being wound around a drum. CONSTITUTION:A reel unit is constituted in such a way that one reel 4 for both feeding and taking up a tape 5 wound around the reel 4 in an endless state is coaxially housed in a rotary drum 3 and the tape is run, with part of the tape 5 being wound around the outer periphery of the drum 3. Namely, the reel unit has a reel 4 wound with the endless tape 5 on its cylindrical layer and the rotary drum 3 coaxially and rotatably incorporating the reel 4 and part of the tape 5 is drawn out from the inside of the cylindrical layer to the outside of the cylindrical layer after the tape 5 is wound around the outer periphery of the drum 3. Therefore, the housing area of the recording medium can be reduced, because the one reel can feed and take up the tape.

4. 发明专利

JPH0276147A OPTICAL TAPE DEVICE 失效
公开(公告)号：JPH0276147A
公开(公告)日：1990-03-15
申请号：JP22660788
申请日：1988-09-12
申请人： HITACHI LTD
发明人： HARA FUMIO , MITA SEIICHI , IZUMIDA MORIJI , TSUCHINAGA HIROYUKI
IPC分类号： G11B15/28 , G11B7/00 , G11B7/003 , G11B7/0055 , G11B15/18 , G11B15/26 , G11B15/32 , G11B23/093
摘要： PURPOSE:To record a constant track pitch signal by housing tape supplying and take-up reels in a cylinder incorporated in a cassette under a vertically piled state and feeding a tape by a capstan to rotate at a constant speed. CONSTITUTION:Tape supplying or take-up reels 3 and 4 are housed in a cylinder 2 incorporated in a cassette 5 under the vertically piled state, a capstan 40 is rotated at a low constant speed by decelerating the rotations of an ultrasonic motor using a piezoelectric material and the cylinder, and the tape is moved at the constant speed on the cylinder 2. Further, the remaining quantity of the tape, the revolving speeds of the reels 3 and 4, etc., are detected, control such as controlling the revolving speeds of the rotary motors of the reels 3 and 4 and braking the rotations of the reels 3 and 4 by a clutch is executed based on the detected results, and the tape is moved at the constant speed. Thus, the signals can be helically recorded on the optical tape with a constant track pitch.

5. 发明专利

JPH01296430A OPTICAL TAPE DEVICE 失效
公开(公告)号：JPH01296430A
公开(公告)日：1989-11-29
申请号：JP12572788
申请日：1988-05-25
申请人： HITACHI LTD
发明人： TSUCHINAGA HIROYUKI , HARA FUMIO , MITA SEIICHI , IZUMIDA MORIJI , ETO YOSHIZUMI
IPC分类号： G11B7/00 , G11B7/003 , G11B7/0033 , G11B7/0055 , G11B11/10 , G11B11/105
摘要： PURPOSE:To decrease the burden of a laser in the recording and erasing of a signal, to use the compact semiconductor laser of mass-production and to cancel a waiting time until the erase completion of one track part by heating an optical recording medium by a heater, etc., in advance. CONSTITUTION:Optical tape 1a and 1b are wound round a cylinder 3 by guide rollers 2a and 2b. A heater 7 and a magnetic head 12a for erasing are provided in the cylinder adjacent to an optical head 4 and a magnetic head 12b for recording and the signal on a track is erase before the recording by the heads 4 and 12b. It is not necessary to provide the head 12a in the position of the roller 2a, and integrate a nichrome wire 5 into a shaft as a heater to heat the tape with a power source 6. Thus, the recording on a tape 1a can be executed by the laser after heating and erasing the signal thereon in advance, thereby decreasing the burden of the laser. Then, it is not necessary to wait for the erasing of one track part.

6. 发明专利

JPS62251717A DEVICE FOR CORRECTING DIRECTION OF LASER BEAM 失效
公开(公告)号：JPS62251717A
公开(公告)日：1987-11-02
申请号：JP9455886
申请日：1986-04-25
申请人： HITACHI LTD , HITACHI MAXELL
发明人： ITO SHO , HARA FUMIO , WATANABE HITOSHI , HAYAMA MASAFUMI
IPC分类号： G11B7/09 , G02B26/10
摘要： PURPOSE:To eliminate the necessity of any excessive optical system and make the design, assemblage, and adjustment of a precise optical working machine easier, by making parallel laser beams having fixed emitting directions and locations obtainable even when the emitting direction from a laser device varies. CONSTITUTION:Laser beams separated by a beam splitter 8 are converged on a two-dimensional position sensor 6 by a lens 7 and an output voltage is produced in accordance with the laser beam position on the sensor 6. The output voltage is compared with a reference voltage at a comparator circuit 5 and a two-axis driving mechanism 4 is driven by outputting a voltage proportional to the difference so as to move a lens 2 in order to make the emitting directions of the beams parallel with each other. The laser beams are further separated by another beam splitter 12 and irradiated upon another two-dimensional position sensor 11 and a voltage is outputted in accordance with the position of the laser beam on the sensor 11. A comparator circuit 10 compares the output voltage with a reference voltage and outputs a voltage proportional to the difference. The voltage drives a two-directional angle driving mechanism and inclines a beam shifter 3 against the direction of the laser beams so as to make the directions and positions of the passed laser beams constant.

7. 发明专利

JPS60256943A SYSTEM FOR CORRECTING UNBALANCE OF INFORMATION CARRIER DISC 失效
公开(公告)号：JPS60256943A
公开(公告)日：1985-12-18
申请号：JP11074084
申请日：1984-06-01
申请人： HITACHI LTD
发明人： HARA FUMIO , ARIMOTO AKIRA , KITANI HIROSHI
IPC分类号： G11B7/26 , G11B7/24 , G11B23/00
摘要： PURPOSE:To correct unbalance of an information carrier disc simply in a short time by using a laser beam so as to remove an outer ridge of a disc during rotation. CONSTITUTION:The optical disc comprising two discs 1(1a, 1b) adhered via a spacer 2(2a, 2b) is fixed to a spindle 4 and driven by a motor 5. An output 9 of the laser 10 is converted to the spacer 2 via an E/O modulator 8 and a lens 7. An output of a vibrating pickup 6 is fed to a peak detecting circuit 11, a minimum value of an output voltage is detected, a signal is fed to the modulator 8, the output of the laser 10 is increased, a part of the spacer 2 is removed so as to correct the unbalance of the disc.

8. 发明专利

JPS6048513A POSITONING MECHANISM 失效
公开(公告)号：JPS6048513A
公开(公告)日：1985-03-16
申请号：JP15485383
申请日：1983-08-26
申请人： HITACHI LTD
发明人： HARA FUMIO , KASAI MASUO , KAKU TOSHIMITSU , SAITOU ATSUSHI , TSUTSUMI ZENJI , TSUNODA YOSHITO
IPC分类号： H01L21/68 , G05D3/00 , G11B7/09 , G11B21/04 , G11B21/10 , H01L21/67
摘要： PURPOSE:To perform precise positioning by forming a damper by utilizing the viscosity of fluid in an extremely small gap. CONSTITUTION:A precise moving base for an optical disk 4 has an optical head 5 fixed on a top plate 12 supported by parallel leaf springs 11 (11a and 11b). The gap G between a magnet 14 and the top plate 12 is filled with the magnetic fluid 16, which is held by magnetic force. For example, the position of a mirror 7 is detected by a position sensor such as a laser length measuring instrument, and the top plate 12 is driven by a piezoelectic oscillator 15 so as to correct an error in the detected position. When the top plate 12 moves by several mum, the gap G is expected to expand by several mum by a magnet holder 17 fixed to a bottom plate 13, but the force for suppressing the expansion is generated by the viscosity of the magnetic fluid 16. This force operates as damping force to shoten the settlement time of the displacement of the top plate 12.

9. 发明专利

JPS59215033A Optical disc recording and reproducing device 失效
标题翻译：光盘记录和再现设备
公开(公告)号：JPS59215033A
公开(公告)日：1984-12-04
申请号：JP8911683
申请日：1983-05-23
申请人： Hitachi Ltd
发明人： TATENO KIMIO , KATAOKA KEIJI , TADA YOSHITO , HARA FUMIO , KAKU TOSHIMITSU
IPC分类号： G11B17/04 , G11B7/0037 , G11B7/08 , G11B7/14 , G11B7/12
CPC分类号： G11B7/0037 , G11B7/08
摘要： PURPOSE:To obtain a small-sized multi-optical head suitable for the stack system by separating a light source section and a control section comprising a head part consisting of an objective lens and a mirror moved while accessing on an optical disc, an automatic focus detecting system and a tracking signal detecting system. CONSTITUTION:A pickup part 5 (comprising an objective lens 2 and mirror 3) is supported on a guide 6 between optical discs 1, 1 arranged in the form of stack at a prescribed interval so as to be moved in the radial direction of the discs 1. A beam 4 from the light source in an optical box 15 reaches the optical discs 1 and returns to the optical box 15 after being reflected. Although the distance between the optical pickup part 5 and the optical box 15 is changed depending on the access position on the optical discs 1, a prescribed optical spot is obtained on the optical discs 1 at all times by forming the laser beam 4 in parallel.
摘要翻译：目的：通过分离光源部分和包括由物镜组成的头部和在光盘上移动的镜子的控制部分来获得适合于堆叠系统的小尺寸多光头，自动对焦检测系统和跟踪信号检测系统。构成：拾取部5（包括物镜2和反射镜3）被支撑在以规定间隔布置成堆叠形式的光盘1,1之间的引导件6上，以沿盘的径向方向移动在光学盒15中的来自光源的光束4到达光盘1并被反射回到光学盒15。虽然光拾取部件5和光学盒15之间的距离根据光盘1上的存取位置而改变，但是通过平行地形成激光束4始终在光盘1上获得规定的光点。

10. 发明专利

JPS58162820A PHOTODETECTOR 失效
公开(公告)号：JPS58162820A
公开(公告)日：1983-09-27
申请号：JP4459282
申请日：1982-03-23
申请人： HITACHI LTD
发明人： TSUNODA YOSHITO , HARA FUMIO , TSUTSUMI ZENJI , MAEDA TAKESHI , KAKU TOSHIMITSU
IPC分类号： G01J1/02 , G01J1/04 , G01J1/42
摘要： PURPOSE:To simplify construction and to improve accuracy by using the end face of a thin metallic film provided on a part of a surface as a knife edge. CONSTITUTION:An Al film or Mo film is vapor deposited at thickness in sub- micron order on a photodetector 3 and is dry etched, whereby a knife edge 2 having the linear accuracy of sub-microns is made. The photodetector 3 is moved in the direction perpendicular to a luminous flux as shown by an arrow to detect the quantity of light, from which the diameter of the luminous flux is determined.

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