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11. 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.

12. 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.

13. 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

14. 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

15. 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

16. 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

17. 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.

18. 发明专利

JPH01263950A OPTICAL HEAD 失效
公开(公告)号：JPH01263950A
公开(公告)日：1989-10-20
申请号：JP8904788
申请日：1988-04-13
申请人： HITACHI LTD
发明人： HARA FUMIO , NAKAMURA SHIGERU , MITA SEIICHI , IZUMIDA MORIJI , TSUCHINAGA HIROYUKI
IPC分类号： G11B7/09
摘要： PURPOSE:To control the focal position of a diaphragm lens on an optical recording medium in a simple mechanism, and to always stably record/reproduce or erase a signal while enduring the high-speed rotation of a cylinder by adding the chromatic aberration of a spot to a collimator lens to collimate light emitted from a semiconductor laser. CONSTITUTION:When the chromatic aberration is added to a collimator lens 2 to make the light emitted from a semiconductor laser 1 into a parallel light flux is unnecessary to be positioned in the external peripheral part of a VTR cylinder 9 like a diaphragm lens 7 to form an optical spot, and it can be positioned in the inner peripheral part of the cylinder 9. Consequently, large acceleration according to the high-speed rotation of the cylinder 9 is eliminated, the wavelength of the semiconductor laser 1 is changed by the effect of the chromatic aberration of the lens, and an optical recording medium 8 is always positioned on the focal surface of the diaphragm lens 7. Thus, the diaphragm lens 7 can consists of single lenses of aspheric surfaces, etc., and the effect of the large acceleration accompanying the high-speed rotation is made smaller, and the stable recording/reproduction or erasing is attained at any time.

19. 发明专利

JPS6464138A OPTICAL TAPE DEVICE 失效
公开(公告)号：JPS6464138A
公开(公告)日：1989-03-10
申请号：JP22023187
申请日：1987-09-04
申请人： HITACHI LTD
发明人： HARA FUMIO , TSUNODA YOSHITO , NAKAMURA SHIGERU , ETO YOSHIZUMI , MITA SEIICHI , IZUMIDA MORIJI
IPC分类号： G11B7/12
摘要： PURPOSE:To exactly record and reproduce the information to and from an object place, by providing a separate optical head for recording the guidance information of the head, in front of the optical head for recording, reproducing or rewriting the information. CONSTITUTION:Guide rollers 4, 18 and a capstan 14 rotate, while bringing into contact with an optical tape 3, so that the optical tape 3 is wound correctly around a cylinder 2 of an optical tape device, and also, the tape 3 moves at constant speed. Also, on a guide roller 4 for rotating synchronously with the traveling of the tape 3, plural pieces of magnetic heads 5 and optical heads 9 for recording a timing mark signal 6 for showing the guidance position information and a guidance track signal 11 are provided separately from an optical head 1. In this state, at the time of recording the information, the timing mark signal 6 is reproduced by a magnetic head 7 for reading provided in the vicinity of the cylinder 2, the traveling speed of the tape 3 is controlled so as to become a prescribed time interval, the head 1 is positioned at a target position in accordance with the guidance track 11, and recording is executed.

20. 发明专利

JPS63304307A SPEED CONTROLLER 失效
公开(公告)号：JPS63304307A
公开(公告)日：1988-12-12
申请号：JP13981187
申请日：1987-06-05
申请人： HITACHI LTD , HITACHI MAXELL
发明人： ANDO MASAAKI , NUNOMURA TOYOYUKI , KASAI MASUO , HARA FUMIO , HAMAMOTO NOBUO
IPC分类号： G05D13/62
摘要： PURPOSE:To realize the speed control with accuracy by detecting continuously the phase difference between a reference speed command pulse and the up-pulse outputted from a laser length measuring device via a phase comparator and feeding said phase difference back to a drive motor via a motor control circuit. CONSTITUTION:A speed servo circuit consists of a laser length measuring device and a pulse converter 4 and the revolutions of a motor 1 are turned into the linear motions by a mechanism part 2. These linear motions are measured by a laser length measuring device 3 and changed into the up/down signals by the converter 4. These up/down signals are inputted to a selector 5 and the up or down signal is selected according to the positive or negative direction feed of a direction signal 6. The selected up or down signal is inputted to a phase comparator 7 and the phase difference is detected by the comparator 7 between said selected signal and the reference speed command pulse received from a speed command reference pulse 8. Then the output of a phase/voltage converter 9 is fed back to the motor 1 for speed control of the motor 1.

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