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51. 发明专利

JPS59210565A Disk revolving device 失效
标题翻译：磁盘转换器
公开(公告)号：JPS59210565A
公开(公告)日：1984-11-29
申请号：JP8266483
申请日：1983-05-13
申请人： Hitachi Ltd
发明人： KANETOMO MASABUMI , TAJIMA TAKESHI , HARA FUMIO
IPC分类号： G11B19/20
CPC分类号： G11B19/2027 , G11B19/2009
摘要： PURPOSE:To eliminate vibration while a disk is revolved and to miniaturize a disk revolving device as a whole by providing an accelerometer and a phase detector for a rotor at a stator part and attaching a balance weight attachment plate to the rotor. CONSTITUTION:A disk 45 containing a screw holes 40 formed equidistantly at the outer cirumferential part of the disk 45 is attached at a place near a disk 31 of a rotor shaft 32. A revolving position detector of the shaft 32 contains a disk 42 having a notch fixed to the shaft 32 and a detector 43 fixed to a stator 36. An accelerometer 44 is attached under the stator 36 to measure the vibration occurring in the direction of an arrow 46. Then the disk 31 is fixed to the rotor 32 and revolved, and the vibration generated by the unbalance due to the eccentricity of revolution of the disk 31 are transmitted to the stator 36 via a static pressure air bearing 35. The level of the vibration is detected by the accelerometer 44 to decide an unbalance degree. Furthermore the position is measured by a phase detector for said unbalance degree on the rotor shaft 32. Then a screw of a prescribed level of weight is attached to the corresponding hole 40 to eliminate the unbalance.
摘要翻译：目的：为了消除盘旋转时的振动，通过在定子部分设置用于转子的加速度计和相位检测器，并将平衡配重板附接到转子，整体上使盘旋转装置小型化。构成：在转子轴32的圆盘31附近的位置安装有包含在盘45的外圆周方向等间距形成的螺孔40的盘45.轴32的旋转位置检测器包含盘42，固定在轴32上的切口和固定在定子36上的检测器43.加速度计44安装在定子36的下方，以测量沿箭头46方向发生的振动。然后，盘31固定在转子32上，并且由于盘31的旋转偏心而由不平衡产生的振动通过静压空气轴承35传递到定子36.振动的水平由加速度计44检测以决定不平衡度。此外，通过用于转子轴32上的所述不平衡度的相位检测器来测量位置。然后将具有规定重量的螺钉附接到相应的孔40以消除不平衡。

52. 发明专利

JPS5936520B2 JPS5936520B2 - 失效
公开(公告)号：JPS5936520B2
公开(公告)日：1984-09-04
申请号：JP15506275
申请日：1975-12-26
申请人： Hitachi Ltd
发明人： TAKEYASU KYOO , IIZUKA KENICHI , HARA FUMIO
IPC分类号： H02P6/18 , H02P1/46

53. 发明专利

JPS58193964A Screw feeder 失效
标题翻译：螺旋进料器
公开(公告)号：JPS58193964A
公开(公告)日：1983-11-11
申请号：JP7524082
申请日：1982-05-07
申请人： Hitachi Ltd
发明人： TAJIMA TAKESHI , HARA FUMIO , KANETOMO MASABUMI , IRIE TAKEO
IPC分类号： F16H25/24
CPC分类号： F16H25/24
摘要： PURPOSE:To provide the titled feeder free from vibration, stick and slip, having a high axial rigidity and light in the peripheral direction by using a static pressure gas bearing for the bearing of the feed screw. CONSTITUTION:A disc 11 for an oil damper and a disc 12 for a thrust bearing are provided on the same shaft as the shaft of the feed screw. At the disc part of an oil damper is provided an oil basin 13 having a gap slightly wider than the disc part in the diametral direction and thickness direction, and therein the disc rotates together with a feed screw 15 rotated by a DC motor 14. Further, at the part of the thrust disc 12, a bearing 15 having a minute gap in the diametral and thickness directions so as to surround the thrust disc 12, and compressed air is supplied toward the thrust disc from orifices 17 provided at several parts.
摘要翻译：目的：通过使用用于进给螺杆轴承的静压气体轴承，提供没有振动，粘滑和滑动的标称进料器，具有高的轴向刚性和周向的光。构成：用于油阻尼器的盘11和用于推力轴承的盘12设置在与进给螺杆的轴相同的轴上。在油阻尼器的盘部分设置有在径向和厚度方向上具有比盘部分稍宽的间隙的油槽13，其中盘与由直流电动机14旋转的进给螺杆15一起旋转。进一步在推力圆盘12的一部分，轴承15在径向和厚度方向上具有围绕推力盘12的微小间隙，并且压缩空气从设置在若干部分的孔17向推力盘供给。

54. 发明专利

JPS5285314A CURRENT CONTROL SYSTEM FOR DC MOTOR 失效
公开(公告)号：JPS5285314A
公开(公告)日：1977-07-15
申请号：JP79976
申请日：1976-01-07
申请人： HITACHI LTD
发明人： TAKEYASU KIYOO , IIZUKA KENICHI , HARA FUMIO
IPC分类号： H02P6/08 , H02P7/06 , H02P7/28 , H02P7/29
摘要： PURPOSE:The simulation circuit of which operation characteristics are similar to those of the control circuit of the DC motor is arranged in parallel, and the motor control circuit is accurately controlled by controlling the simulation circuit.

55. 发明专利

JPH02121123A TAPE DEVICE 失效
公开(公告)号：JPH02121123A
公开(公告)日：1990-05-09
申请号：JP27296988
申请日：1988-10-31
申请人： HITACHI LTD
发明人： HARA FUMIO , MITA SEIICHI , IZUMIDA MORIJI , TSUCHINAGA HIROYUKI
IPC分类号： G11B7/00 , G11B7/003 , G11B7/0055 , G11B7/09
摘要： PURPOSE:To stably position a head on a target signal track even at a part where no tape exist on a cylinder by applying the sample servo technique. CONSTITUTION:A signal track is discontinuous at the position of a slit 8 while a cylinder 3 is revolving, and therefore the focus and tracking control operations are interrupted. Thus a sampling/holding circuit 6 issues a command to a control circuit 11 to perform the sampling/holding jobs when the spot of an optical head 2 reaches the slit 8. The circuit 11 performs the focus and tracking control jobs for the time T corresponding to the width points A and B of the slit 8 based on an index pulse 10 which is produced through the slit of an encoder set in a motor 7 which revolves a cylinder 3, for example, for each rotation of the motor 7. Thus no error signal is detected during the sample-hold operation and therefore, no tape exists. Therefore, a positioning control system is not affected despite the increase of the error signal value.

56. 发明专利

JPH0224862A TAPE POSITION CONTROL SYSTEM 失效
公开(公告)号：JPH0224862A
公开(公告)日：1990-01-26
申请号：JP17270588
申请日：1988-07-13
申请人： HITACHI LTD
发明人： TSUCHINAGA HIROYUKI , HARA FUMIO , IZUMIDA MORIJI , MITA SEIICHI , ETO YOSHIZUMI
IPC分类号： G11B15/60 , G11B7/00 , G11B7/003 , G11B7/0055 , G11B15/61
摘要： PURPOSE:To reduce burden applied to a tracking servo mechanism so that the tracking can be more stabilized by controlling the position of a magneto-optical tape by optically checking the movement of the tape in a lateral direction while the tape is run. CONSTITUTION:Optical tapes 1a and 1b are wound around a cylinder composed of an upper and lower stators 3a and 3b by means of guide rollers 2a and 2b and guided by a guide belt so that the tapes 1a and 1b can be run through normal positions. Bisected photodetectors 5a and 5b are provided on the stator 3b above the belt 4 and irradiated by light from light sources 6a and 6b. Light-transmissive section 7a and 7b are provided on the optical tapes 1 at the same interval as that between the detectors 5a and 5b. Therefore, when it is discriminated that the tapes 1 are dislocated from the normal positions from the light-transmissive sections 7a and 7b when the sections pass over the detectors 5a and 5b, the detectors 5a and 5b output a differential signal which is proportional to the dislocated quantity of the tapes 1. When the differential signal is outputted, the tapes 1 are returned to the normal positions by expanding or contracting piezo-electric elements 10a and 10b. Therefore, the burden applied to a tracking servo mechanism can be reduced and the tracking is more stabilized.

57. 发明专利

JPH01298524A OPTICAL TAPE DEVICE 失效
公开(公告)号：JPH01298524A
公开(公告)日：1989-12-01
申请号：JP12704288
申请日：1988-05-26
申请人： HITACHI LTD
发明人： HARA FUMIO
IPC分类号： G01P3/36 , G11B7/00 , G11B7/003 , G11B15/46 , G11B15/467
摘要： PURPOSE:To allow an optical head to stably track an objective track arranging a laser Doppler interferometer for detecting the traveling speed of a tape adjacently to the tape. CONSTITUTION:A recording area 13 of timing marks 4 is formed on the end face part of the optical tape 1. An output from the laser Doppler interferometer 7 is detected as an analog signal 26, the moving distance of the optical tape 1 in each fine time DELTAt is found out from DELTAV, and when a value S calculated from these values DELTAV, DELTAt reaches a distance (d) between the timing marks 4, a trigger pulse 28 is generated from an arithmetic circuit 27. A control circuit 8 generates a timing pulse at a time interval T corresponding to the fixed distance (d). The interval of the timing pulses is changed in accordance with the variation of the moving speed of the tape 1. The variation of the traveling speed of the tape 1 in each fixed time DELTAt is measured by the laser Doppler interferometer 7 and the measured value is fed back to the control circuit 8. Thus, the track can be stably tracked.

58. 发明专利

JPS62119739A SYSTEM FOR CORRECTING INCLINATION OF OPTICAL DISK 失效
公开(公告)号：JPS62119739A
公开(公告)日：1987-06-01
申请号：JP25853385
申请日：1985-11-20
申请人： HITACHI LTD
发明人： HARA FUMIO , KAKU TOSHIMITSU , MAEDA TAKESHI , NAKAMURA SHIGERU
IPC分类号： G11B7/09 , G11B7/004 , G11B7/095
摘要： PURPOSE:To properly correct a tracking offset, by correcting the tracking offset by using a value obtained by correcting a detected tracking offset value. CONSTITUTION:A tracking offset quantity is multiplied by, for example, 0.7-0.8 by means of a correcting circuit 20. The corrected tracking offset quantity is differentiated with a track signal by a differential amplifier 21 and a track signal which is obtained by correcting the output of the amplifier 21 in offset due to the inclination of a disk is produced. By inputting the corrected track signal to a track servo circuit 22 and driving, for example, the tracking actuator 9 of a galvano-mirror, etc., for tracking a deviation from a guide groove 2, the accurate tracking of the guide groove 2 which is free from the inclination of the disk is realized.

59. 发明专利

JPS59162793A Brushless motor 失效
标题翻译：无刷电机
公开(公告)号：JPS59162793A
公开(公告)日：1984-09-13
申请号：JP2705084
申请日：1984-02-17
申请人： Hitachi Ltd
发明人： TAKEYASU KIYOO , IIZUKA KENICHI , HARA FUMIO
IPC分类号： H02P6/18 , H02P6/02
CPC分类号： H02P6/182
摘要： PURPOSE:To accurately detect the rotating position of a rotor by converting the counterelectromotive signal of each phase winding through a filter into a sinusoidal voltage signal having substantially constant phase difference to the rotating position of a rotor and commutating a drive current by the signal. CONSTITUTION:Counterelectromotive voltage signals 20-b, 20c, 20a of phases are converted into sinusoidal signals 21-b, 21-c, 21-a of 90 deg. delay via a filter 9, become counterelectromotive signals 22-a, 22-b, 22-c for phases (a)-(c) through a comparator 10, and inputted to a changeover switch 13 together with 3-phase synchronizing signals 23-a-23-c obtained through a shift register 12 from an oscillator 11. The signals 23-a-23-c are selected at the starting time and the signals 22-a-22-c are selected at the normal time by a conversion signal 28 from an instructing circuit 14, and converted to 6-phase commutator element commutation control signals 25-a-26-c by a logic circuit 15.
摘要翻译：目的：通过将每个相绕组的反电动势信号通过滤波器转换成具有与转子旋转位置基本上恒定的相位差的正弦电压信号，并通过信号换向驱动电流，来精确地检测转子的旋转位置。构成：相位的反电动势电压信号20-b，20c，20a转换成90度的正弦信号21-b，21-c，21-a。经由滤波器9的延迟通过比较器10成为相位（a） - （c）的反电动势信号22-a，22-b，22-c，并与3相同步信号23- 通过来自振荡器11的移位寄存器12获得的a-23-c。在开始时间选择信号23-a-23-c，并且在正常时间通过转换来选择信号22-a-22-c 来自指令电路14的信号28，并由逻辑电路15转换成6相换向器元件换向控制信号25-a-26-c。

60. 发明专利

JPS58164034A FOCUS CONTROLLING OPTICAL SYSTEM 失效
公开(公告)号：JPS58164034A
公开(公告)日：1983-09-28
申请号：JP4459382
申请日：1982-03-23
申请人： HITACHI LTD
发明人： ITOU SHIYOU , HARA FUMIO , KATOU KEIZOU
IPC分类号： G02B7/28 , G11B7/09 , G11B7/26
摘要： PURPOSE:To prevent a focus shift due to inclination of an optical disk, by placing a photodetector on an image plane opposing to a photoresist face of the optical disk, of a recording objective lens. CONSTITUTION:A dotted line 10 shows an image plane in case when a photoresist face of a disk 4 is regarded as an object face, of a recording lens 5, and a photodetector 7 is provided on this place. Therefore, even if the photoresist face is titled, a reflected ray reaches the same point as the case which has no inclination. Laser light for auto-focusing is emitted from a laser light source 1, and is irradiated to the optical disk 4 through a polarizing prism 2, a 1/4 wavelength plate 8, a beam splitter 3 and the recording lens 5. Also, information recording light 6 is irradiated, and a photoresist of the optical disk 4 is exposed. In order to prevent leak-in of the information recording light 6, a filter 11 is provided.

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