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11. 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.

12. 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。

13. 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.

14. 发明专利

JPS52104902A TURNTABLE FOR FLEXIBLE SHEET DISK 失效
公开(公告)号：JPS52104902A
公开(公告)日：1977-09-02
申请号：JP2113576
申请日：1976-03-01
申请人： HITACHI LTD
发明人： HARA FUMIO , KASHIWARA YASUNARI
IPC分类号： G11B17/32 , H04N5/76
摘要： PURPOSE:To obtain a stable regenerative signal by means of making the turntable a hollow structure with which a space is installed between two sides of the table, thereby adhering the sheet on the surface of the turntable and preventing a vertical motion of the sheet.

15. 发明专利

JPS51150302A CASSETTE UNIT OF FLEXIBLE SHEETTSHAPED DISK 失效
公开(公告)号：JPS51150302A
公开(公告)日：1976-12-23
申请号：JP7319975
申请日：1975-06-18
申请人： HITACHI LTD
发明人： HARA FUMIO , KASHIWARA YASUNARI
IPC分类号： G11B17/03
摘要： PURPOSE:Along diameter of flexible sheet-shaped disk, center of cassette can be bent for protection.

16. 发明专利

JPS51107808A 失效
公开(公告)号：JPS51107808A
公开(公告)日：1976-09-24
申请号：JP3218175
申请日：1975-03-19
申请人： HITACHI LTD
发明人： KASHIWARA YASUNARI , HARA FUMIO
IPC分类号： G11B17/32 , G11B25/04

17. 发明专利

JPS5160510A Jikishiitosochi 失效
公开(公告)号：JPS5160510A
公开(公告)日：1976-05-26
申请号：JP13427174
申请日：1974-11-25
申请人： Hitachi Ltd
发明人： HARA FUMIO , KASHIWARA YASUNARI
IPC分类号： G11B17/32 , G11B25/04

18. 发明专利

JP2585305B2 失效
公开(公告)号：JP2585305B2
公开(公告)日：1997-02-26
申请号：JP26636287
申请日：1987-10-23
申请人： HITACHI LTD
发明人： HARA FUMIO , TSUNODA YOSHITO , ETO YOSHIZUMI , MITA SEIICHI , IZUMIDA MORIJI
IPC分类号： G11B7/00 , G11B7/003 , G11B7/004

19. 发明专利

JP2559742B2 失效
公开(公告)号：JP2559742B2
公开(公告)日：1996-12-04
申请号：JP17393087
申请日：1987-07-14
申请人： HITACHI LTD
发明人： SUGYAMA HISATAKA , MAEDA TAKESHI , HARA FUMIO , SAITO ATSUSHI
IPC分类号： G11B7/09

20. 发明专利

JPH01311433A OPTICAL TAPE DEVICE 失效
公开(公告)号：JPH01311433A
公开(公告)日：1989-12-15
申请号：JP14148888
申请日：1988-06-10
申请人： HITACHI LTD
发明人： HARA FUMIO , MITA SEIICHI , ITO SHO
IPC分类号： G11B7/26 , G11B7/00 , G11B7/003 , G11B7/0055 , G11B7/09 , G11B7/24
摘要： PURPOSE:To expand an area recordable a signal on an optical tape by forming a guide track on a medium in advance, and forming the track by using a master disk manufactured by an interference fringe generated by the interference of light. CONSTITUTION:When a beam 4 is separated into two beams by a half prism 5 and they are formed in flat beams by using beam expanders 10a and 10b and are superposed on a cylindrical lens 8, the interference fringe 9 is stopped on the master disk 2. When the master disk 2 is rotated for one revolution as changing the position of the fringe 9 by a phase shifter 6 at constant speed, the locus of the fringe 9 on the master disk 2 forms a pattern having a projecting groove 7 which forms an oblique concentric circular cylinder with a constant angle. Since plural grooves 7 are formed simultaneously by the fringe 9 arranged at constant intervals, pitch accuracy can be heightened. By transferring the groove 7 on the optical tape 1, plural guide grooves 11 can be formed. Stable tracking can be obtained at the time of performing the recording, the reproduction, and the erasure of a signal by using the groove 11 for the guide track of the tape 1, and the recording with high density can be realized due to high pitch accuracy.

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