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61. 发明专利

JPH03189935A SEMICONDUCTOR LASER AND OPTICAL INFORMATION DEVICE USING THE SAME 失效
公开(公告)号：JPH03189935A
公开(公告)日：1991-08-19
申请号：JP32845189
申请日：1989-12-20
申请人： HITACHI LTD
发明人： SASAKI TORU , MIURA MICHIO , KISHI YUJI , OTSUKA YASUO
IPC分类号： G11B11/10 , G11B7/135 , G11B11/105
摘要： PURPOSE:To correct astigmatism without providing separately optical parts for APC (Automatic Power Control) by providing a means for splitting laser light into two or more beams and a photodetector for one part of the split beams into a single case. CONSTITUTION:A parallel plate having a beam splitter film 4a for reflecting one part of incident light and transmitting the remainder is disposed in an optical path of forward light emitted from a laser chip 1, and a beam splitting means 4 inclined with its normal vector in a junction plane of the laser chip 1 to an optical axis and the photodetector 2 for detecting the reflecting beam or the transmitting beam from the beam splitting means 4 are provided in the single case 3. The reflecting beam 16 is received by the photodetector 2, and in order to make its output constant, an output of the forward light 5 emitted from the surface side 1a of the laser chip 1 is controlled to be constant by using an APC circuit 7. By this method, astigmatism can be corrected.

62. 发明专利

JPH03134835A OPTICAL HEAD 失效
公开(公告)号：JPH03134835A
公开(公告)日：1991-06-07
申请号：JP27157889
申请日：1989-10-20
申请人： HITACHI LTD
发明人： SASAKI TORU , MIURA MICHIO , KISHI YUJI , OTSUKA YASUO , KONUMA YOSHIHIRO
IPC分类号： G11B11/10 , G11B7/135 , G11B11/105
摘要： PURPOSE:To correct anisotropy of laser light emitting from a semiconductor laser without increasing number of parts in an optical head by using two prisms of different refractive indices for a beam splitter for beam shaping. CONSTITUTION:An isotropic light beam 2 emitted from a semiconductor laser 1 which is the light source of linearly polarized light is changed into parallel incident light 4 by a collimator lens 3, enters a beam splitter 5 through the incident surface 5a with an oblique angle where the beam is shaped. Since two prisms 5b, 5d which constitute the beam splitter 5 have different refractive indices from each other, the incident surfaces 5a and the beam splitting surface 5c have an effect of beam shaping, and thus, the beam 2 is changed into isotropic for any direction and exits from the exit surface 5e. The beam 2 is now a first irradiating light 10, reflected by a mirror 6, focused by an objective lens 7, and made to irradiate the recording surface 8 of a disk 8. By this constitution, anisotropy of semiconductor laser light can be corrected without using more parts in the optical head.

63. 发明专利

JPH02123492A INFORMATION RECORDING CARRIER AND INFORMATION RECORDING /REPRODUCING DEVICE 失效
公开(公告)号：JPH02123492A
公开(公告)日：1990-05-10
申请号：JP27837388
申请日：1988-11-02
申请人： HITACHI LTD
发明人： IMADA RITSUO , SASAKI TORU , KUDO YOSHIMICHI , OTSUKA YASUO , KISHI YUJI , KATASE YOSHIHIRO
IPC分类号： B42D15/10 , G06K17/00 , G06K19/07
摘要： PURPOSE:To allow only one optical beam to transmit/receive an information signal and supply power to an information recording carrier by laminating a photodetecting element and a polarizing element to constitute a light I/O part to/from the information recording carrier. CONSTITUTION:At the time of reading out a signal, voltage is impressed to an electro-optical element 2A1 to selectively transmit projected light, incident laser beam upon crystal 2a1 is reflected on the surface of a photoelectric cell 2b1, made incident upon an alalyzer 14 to convert a change of polarization into a change in optical intensity and made incident upon a detector 16. An operation control circuit 6 forms a signal to be sent from the carrier 1A1 to a reproducing device 10A1 and the signal is added to the crystal 2a1 by a driving circuit 3 and read out from an amplifier circuit 17. At the time of recording, and output corresponding to the intensity of a laser beam 9a made incident upon the photoelectric cell 2b1 is rectified by a diode 51 and a capacitor 52 to obtain a DC voltage, the DC voltage is divided, the output of the photoelectric cell 2b1 is divided, a signal voltage obtained by subtracting both the divided outputs through a differential amplifier 55 is extracted and information is recorded in the carrier 1A1 by an output beam from the device 10A1. Since one optical window is sufficient for the carrier 1A1, the carrier is appropriate for application to an IC card.

64. 发明专利

JPH01133239A INFORMATION RECORDING AND REPRODUCING SYSTEM AND INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH01133239A
公开(公告)日：1989-05-25
申请号：JP28953387
申请日：1987-11-18
申请人： HITACHI LTD
发明人： FUKUSHIMA AKIO , NAKAJIMA JUNJI , MIURA YOSHIO , KISHI YUJI
IPC分类号： G11B9/00 , G11B9/14
摘要： PURPOSE:To enable high-speed transfer at a high recording density by subjecting the spacing between a conductive needle and information recording layer to servo control so as to obtain a reference value with the average value of tunnel current as a reference at the time of reproducing and the average value of the tunnel current before intensification for the purpose of recording as a reference at the time of recording. CONSTITUTION:A servo system for controlling the spacing between the information recording layer 15 and the information recording layer 4 controls the spacing between the conductive needle 15 and the information recording medium 1 in the perpendicular direction thereof by driving piezo-electric ceramics 45c to expand or contact in such a manner that the average value of the tunnel current attains the specified value. The spacing between the conductive needle 15 and the recording layer 4 is so maintained and controlled as to attain the reference value with the average value of the tunnel current obtd. by averaging the tunnel current fluctuating according to the presence or absence of recording as a reference at the time of recording. The spacing between the conductive needle and the recording layer 4 is maintained with the average value of the tunnel current at the point of the time before intensification of the tunnel current for the purpose of recording as a reference and is subjected to the servo control by the piezo-electric ceramics 45c so as to obtain the reference value at the time of recording.

65. 发明专利

JPS63276393A STEREOSCOPIC VIDEO REPRODUCING DEVICE 失效
公开(公告)号：JPS63276393A
公开(公告)日：1988-11-14
申请号：JP11053487
申请日：1987-05-08
申请人： HITACHI LTD
发明人： ONISHI KUNIKAZU , OKU MASUO , KISHI YUJI , FUJII YUKIO
IPC分类号： H04N13/00
摘要： PURPOSE:To provide compatibility with a video disk player by reproducing video images in two directions having a parallax from both sides of a disk simultaneously and displaying the video image of each direction on a monitor for 1/60sec each. CONSTITUTION:The video signal in two directions having a parallax is recorded on both sides of a video disk 1. The video signal is reproduced simultaneously by using pickups 11, 12 from each side of the video disk 1 and given to 3D processing circuits 411-413, 421-423 in processing circuits 41, 42 via Y/C separation circuits 41, 42 and the video image of each direction is displayed on a monitor 2 for each 1/60sec via a switching circuit 100. Then a stereoscopic video image is obtained by observing a picture through spectacles whose left/ right shutters a switched synchronously with the pattern.

66. 发明专利

JPS6247893A OPTICAL DISK CARTRIDGE 失效
公开(公告)号：JPS6247893A
公开(公告)日：1987-03-02
申请号：JP18723085
申请日：1985-08-28
申请人： HITACHI LTD
发明人： FURUYA JUN , OKAZAKI KICHIZAEMON , MIURA YOSHIO , MIURA MICHIO , NISHIJIMA TATSUMI , KISHI YUJI
IPC分类号： G11B23/03 , G11B17/22 , G11B23/023
摘要： PURPOSE:To obtain an optical disk cartridge by connecting the upper and lower cases to partitioning plates via each side of a rotary shaft and opening and closing these plates in the form of book. CONSTITUTION:The partitioning plates 7 and their shafts 8 of a lower case 3 are hooked to bearings of an upper case 2. Then these plates 7 are opened and closed in the form of book by means of bellows-shaped members 11 with opening angles optimum to an automatic CD exchanging action. Thus the length of the members 11 are reduced gradually downward and therefore the desired plate 11 is always opened at a fixed position. In addition, a pawl 12 of a CD selection drum 4 usually interlocks a projection 9 of the case 3 and closes. Then the drum 4 is rotated after the revolving angle is detected by a photosensor. Thus the pawl 12 interlocks another plate 11 and holds the plates 11 selectively. Then the plates 11 can be opened and closed at an optional position. In such constitution, it is possible to obtain a compact CD cartridge of simple constitution.

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