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1. 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.

2. 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.

3. 发明专利

JPS62226444A OPTICAL DISK 失效
公开(公告)号：JPS62226444A
公开(公告)日：1987-10-05
申请号：JP6838286
申请日：1986-03-28
申请人： HITACHI LTD , HITACHI MAXELL
发明人： HARA FUMIO , ITO SHO , WATANABE HITOSHI
IPC分类号： G11B7/24 , G11B11/10 , G11B11/105
摘要： PURPOSE:To eliminate the deformation and failure of a metallic structure and to improve the surface accuracy thereof by the constitution consisting in adhering a recording medium consisting of a plastic disk or glass disk and recording film on one face of the metallic substrate. CONSTITUTION:Aluminum 6 for reflection is deposited by evaporation on one side of the plastic substrate 1 on which pits 5 are preliminarily recorded in the form of ruggedness and therefore the light reflection of the substrate 2 does not arise when the substrate 1 and the aluminum substrate 2 are adhered by a resin 3 curable by UV rays and if laser light 4 for signal reproduction is made incident thereto from the substrate 1. The recording is,therefore, not affected by the surface accuracy of the aluminum substrate 2 even if said accuracy is poor. The surface on which signals 5 are recorded is on the adhesive surface side and therefore, the failure in reproduction by fingerprints, etc., is obviated. Since the substrate 1 is adhered to the metallic substrate 2, the substrate withstands a high speed rotation and is free from failure.

4. 发明专利

JPH01271941A MASTER OPTICAL DISK RECORDER 失效
公开(公告)号：JPH01271941A
公开(公告)日：1989-10-31
申请号：JP9813088
申请日：1988-04-22
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TAJIMA TAKESHI , HARA FUMIO , HAYAMA MASAFUMI , KANETOMO MASABUMI , MATSUO AKIHIKO , KONDO YOSHIMASA , KAWAGUCHI KOJI
IPC分类号： F16C17/00 , F16C29/12 , F16H25/20 , G11B7/26
摘要： PURPOSE:To attain highly accurate positioning by forming the moving mechanism of a moving base, on which a moving optical system is loaded, with slide elements such as a slide screw, slide bearings and slide guides and further, using together a mechanism to lighten the weight of the moving base. CONSTITUTION:A moving base 18 on which a moving optical system 17 is loaded is moved to a glass disk 11 by a precision lap screw 24 supported by bearings 22 and 23. The base 18 is provided with a V-groove 26 and slides on two guide bars 28 through PTFE resin 29. Further, the base 18 is provided with a semicircular air bearing 30 opposite to the bar 28 and a spring 32 is provided with a spacer 31 between it and the base 18. The thickness of the spacer 31 is changed and the spring is bent to generate upward force. Compressed air 33 is supplied to the bearing 30, blown out to the bar 28 through a nozzle and floats the bearing when moving. By lightening the weight of the base 18 and making its movement smooth like this, the highly accurate positioning is attained.

5. 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

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

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