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61. 发明专利

JPS63315299A OPTICAL INFORMATION RECORD MEDIUM 失效
公开(公告)号：JPS63315299A
公开(公告)日：1988-12-22
申请号：JP15118987
申请日：1987-06-19
申请人： HITACHI LTD
发明人： KOSAKA MASAHIRO , NAGAE KEIJI , MORI YUJI , ASANO HIDEKI , SHIMADA SATOSHI , KOYANAGI HIROAKI , SATO YOSHIO , TSUBOI NOBUYOSHI , MINEMURA HIROYUKI , KAWAKAMI HIROJI
IPC分类号： B42D15/10 , B42D15/02 , G06K19/00

62. 发明专利

JPS63251939A OPTICAL INFORMATION RECORDER 失效
公开(公告)号：JPS63251939A
公开(公告)日：1988-10-19
申请号：JP8669587
申请日：1987-04-08
申请人： HITACHI LTD
发明人： TSUBOI NOBUYOSHI , SATO YOSHIO , MIYAMOTO NORIFUMI , KOYANAGI HIROAKI , MINEMURA HIROYUKI
IPC分类号： G11B7/135 , G11B7/00 , G11B7/0055 , G11B7/30
摘要： PURPOSE:To record and erase information at high speed and, at the same time, to prevent occurrence of insufficient erasing of information, by projecting both spots of natural light and laser beam upon an optical recording medium, with the natural light spot preceding the laser beam spot in the moving direction of the medium. CONSTITUTION:An optical means which projects a spot of laser beam (i) and spot of natural light (n) which is larger than the spot of laser beam closely to each other upon an optical recording medium 14 is provided and both spots are projected upon the medium 14 under a condition where the spot of the natural light (n) precedes the spot of laser beam (i) in the moving direction of the medium 14. Since sufficiently high output one can be obtained for the light source of the natural light, the energy density of the natural light spot can be made sufficiently high on the recording medium and the spot of the natural light (n) can make preheating works by heating wide areas preceding the laser beam spot on the optical recording medium 14. Therefore, the temperature raising time can be made shorter and high-speed recording and erasing of information or recording, while erasing is made, can be realized. Moreover, since heating can be performed at the high energy density, all information to be erased can be erased completely at the time of erasing.

63. 发明专利

JPS63247925A OPTICAL HEAD 失效
公开(公告)号：JPS63247925A
公开(公告)日：1988-10-14
申请号：JP7743087
申请日：1987-04-01
申请人： HITACHI LTD
发明人： TSUBOI NOBUYOSHI , SATO YOSHIO , KOYANAGI HIROAKI , MINEMURA HIROYUKI
IPC分类号： G11B7/135
摘要： PURPOSE:To miniaturize a head, by using a hologram element having a function to condense a beam of light on a disk, and a function to divide and condense reflected light on two pairs of optical detectors whose positions are deviated. CONSTITUTION:As for the emitting light of a light source 10, a part of it is diffracted to the outside of an optical axis by a hologram 14, but, transmitted light is focused at a spot on the recording medium of an optical disk 22 by a Fresnel lens. The reflected light from the disk 22 becomes convergence light by a lens 16, and most of it are diffracted by the hologram. And a beam of light made incident on the area 14ab of the hologram element is diffracted so as to be converged to the optical detectors 12a and 12b, and the beam of light made incident on the area 14cd is diffracted so as to be converged to the optical detectors 12c and 12d. Since the diffracted light changes its position on the optical detector according to relative position between the disk 22 and the lens 16, it is possible to obtain a focal error signal proportional to a focal error. By constituting a device in such way, since an objective lens can be made unnecessary, the miniaturization of the head can be realized.

64. 发明专利

JPS63217255A DEVICE FOR EVALUATING OPTICAL RECORDING MATERIAL 失效
公开(公告)号：JPS63217255A
公开(公告)日：1988-09-09
申请号：JP5007587
申请日：1987-03-06
申请人： HITACHI LTD
发明人： MIYAMOTO NORIFUMI , SATO YOSHIO , TSUBOI NOBUYOSHI , KOYANAGI HIROAKI , MINEMURA HIROYUKI
IPC分类号： G01N21/55 , G01N21/88 , G01N21/95 , G11B7/26
摘要： PURPOSE:To permit quick and easy measurement of the optical characteristics of an optical recording medium in relation to temp. by using a laser as a light source for heating and condensing the laser to a micro-spot by means of a lens. CONSTITUTION:A light projection part 52 has two kinds of light sources; a laser light source 60 for heating and a laser for detecting a change in reflectivity. The laser light emitted from the light source 60 is converted by a modulator 59 utilizing an electro-optic effect to pulses which are focused onto a sample 64 to be measured through an optical head 58. The laser is focused to several micron sizes at this point and attains several hundred temp. instantaneously. The IR rays radiated from the heating part of the sample 64 are condensed by a lens 54 of a reflection type and enter an IR detector 53. The signal from the detector 53 is amplified by an amplifier 56 and is fed to a data recording part 57. On the other hand, the laser for detecting the change in the reflectivity forms a spot similarly on the sample surface. The spot positions of the laser 60 and the laser for detecting the change in the reflectivity on the sample surface are matched in order to exactly measure the reflectivity of the sample during heating.

65. 发明专利

JPS63117339A OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS63117339A
公开(公告)日：1988-05-21
申请号：JP26068686
申请日：1986-11-04
申请人： HITACHI LTD
发明人： SATO YOSHIO , SHIMADA SATOSHI , TSUBOI NOBUYOSHI , MIYAMOTO NORIFUMI , KOYANAGI HIROAKI , MINEMURA HIROYUKI , KAWAKAMI HIROJI
IPC分类号： B41M5/26 , G11B7/24
摘要： PURPOSE:To permit partial erasure and entire erasure of a memory at a high speed by segmenting a recording film consisting of a good conductor having a high tendency to generation of eddy current by a resistant material having large specific resistance and a lower tendency to generation of eddy current to areas. CONSTITUTION:The recording film 14 is segmented to regions by insulating films 16 having the large electric resistance. The eddy current is generated in the recording film 4 if a magnetic field is generated in a core 42 by passing high frequency current to a coil 44, but the recording film 14 is partitioned by the insulating films 16 and, therefore, the spread of the generated eddy current over the entire surface of a disk is prevented by the films 16 and the concentration of the eddy current is permitted. The local and efficient heating of the film 14 with small electric power is, therefore, possible. Since the heating of the adjacent recording films partitioned by the insulating films is suppressed to a lower level, the erasure of only the assigned region is possible.

66. 发明专利

JPS62239325A OPTICAL INFORMATION RECORDER 失效
公开(公告)号：JPS62239325A
公开(公告)日：1987-10-20
申请号：JP7994386
申请日：1986-04-09
申请人： HITACHI LTD
发明人： SASAKI HIROSHI , WATABE ATSUMI , SATO YOSHIO , SHIMADA SATOSHI , TSUBOI NOBUYOSHI , MIYAMOTO NORIFUMI , KOYANAGI HIROAKI , MINEMURA HIROYUKI , NIHEI HIDEKI
IPC分类号： G11B7/00 , B41M5/26 , G11B7/0045 , G11B7/0055 , G11B7/24 , G11B7/30
摘要： PURPOSE:To improve the recording and erasion sensitivity as well as the S/N at the time of reproduction with a rewritable optical disk, by heating auxiliary the optical disk by means of a heating means excluding the laser light and using the laser light to record, erase and reproduce information respectively. CONSTITUTION:An eddy current is produced at a part of a disk 9 when a magnetic force line B passes through the disk 9 and the disk 9 is partly heated. Here the heating value of the disk 9 can be controlled by the material of the disk 9, the level of the eddy current, the continuous application time of the line B, the shift of the disk 9, etc. Thus the heat is secured for functions of recording, erasion, etc. The quantity of heat needed more for recording, erasion, etc. is obtained by the output light L5 that is focused on the disk 9 based on the quantity of light produced from a light source 1. Thus the necessary reduction of power is possible with the source 1. In a reproduction mode a photodetector 7 decides the binary signal for the value of the incident light L6 obtained with reflection through the disk 9 based on the quantity of light produced by the source 1.

67. 发明专利

JPS62239224A INPUT INTEGRATION DISPLAY MEDIUM 失效
公开(公告)号：JPS62239224A
公开(公告)日：1987-10-20
申请号：JP8296586
申请日：1986-04-10
申请人： HITACHI LTD
发明人： KANEKO TOSHITERU , WATANABE RYUJI , SASAKI HIROSHI , SHIMADA SATOSHI , KOYANAGI HIROAKI , NAGAE KEIJI
IPC分类号： G06F3/041 , G06F3/033
摘要： PURPOSE:To attain a precise input without giving unnatural feelings due to the difference between a display part and an input part at the time of input by writing information in a display medium itself so as to input it. CONSTITUTION:A drive layer 503 composed of a display layer 502 and a resistance heating body is sandwiched by protection layers 501. A current is caused to flow at a designated position on the drive layer 503 where a pattern is cut in a segment-like shape, and the drive layer 503 composed of the resistance heating body heats and rapidly cools the display layer 502. Consequently the hue of a part 504 is changed and information is displayed. Since the display medium applying an optical recording material has a recording action, it needs not current to flow in the drive layer 503 if the same information is continuously recorded. However, if the displayed information is erased, said medium is heated lower than at display.

68. 发明专利

JPS6251044A OPTICAL HEAD 失效
公开(公告)号：JPS6251044A
公开(公告)日：1987-03-05
申请号：JP18843285
申请日：1985-08-29
申请人： HITACHI LTD
发明人： ITO TETSUO , SATO YOSHIO , SASAKI HIROSHI , MIYAMOTO NORIFUMI , KOYANAGI HIROAKI , OKADA TEIGO , SHIMADA SATOSHI , NIHEI HIDEKI , TSUBOI NOBUYOSHI , NAGAI HAJIME
IPC分类号： G11B7/09 , G11B7/135
摘要： PURPOSE:To reduce the loss of optical energy at a collimator portion by changing a collimator from a lens to a concave mirror having a high reflection factor. CONSTITUTION:Rays of light emitted from a light source 2 become parallel rays by being reflected with a concave mirror 1 and after passing a polarization beam splitter 3, it passe through a 1/4 wavelength plate 5 and become a circle polarized light from a linear deflection and by a reduction lens 4, it is reduced to a micro spot, being irradiated on an optical disc 8 on which an optical recording material is coated. The rays of light reflected from the optical disc 8 advance in the reverse direction of incident and after passing through the 1/4 wavelength plate 4, and are changed from the circularly polarized light to the linearly polarized light again. At such a time, since the direction of the linearly polarized light is switched in the reverse direction of an incident time, the light is reflected by the deflection beam splitter 3 and is made incident on an optical detector 7 passing through a cylindrical lens 6. From the optical detector 7, signals for a recording signal reproducing, a focus control and a tracking can be taken out.

69. 发明专利

JPS628339A OPTICAL TAPE DEVICE 失效
公开(公告)号：JPS628339A
公开(公告)日：1987-01-16
申请号：JP14478085
申请日：1985-07-03
申请人： HITACHI LTD
发明人： TSUBOI NOBUYOSHI , NIHEI HIDEKI , SATO YOSHIO , OKADA TEIGO , NAGAI HAJIME , SHIMADA SATOSHI , SASAKI HIROSHI , ITO TETSUO , MIYAMOTO NORIFUMI , KOYANAGI HIROAKI
IPC分类号： G11B7/00 , G11B7/003 , G11B7/09 , G11B15/60
摘要： PURPOSE:To attain high density information recording not requiring any guide line by forming a synchronizing signal to both ends of a tape in running direction and a direction orthogonal thereto, forming an information recording part between them and correcting the relative position between the tape and the optical scanning in response to a signal from a synchronizing signal recording part at both the ends when the tape is subject to optical scanning. CONSTITUTION:In a tape device recording/reproducing information by using an optical signal, the synchronizing signal recording part is formed on the tape and the synchronizing signal is recorded on the part at recording separately from an information signal. The synchronizing signal is utilized at reproduction so as to allow the reproducing optical beam to be scanned on the recording of the information signal recording sector. For example, in the recording information signal sector by one scanning having an angle theta in the lengthwise direction of the tape, the range of one scanning is one side of the tape when the tape is used reversely and nearly from one end to the other of the tape when the tape is used unidirectionally. The one scanning includes the synchronizing signal recording sector on which the synchronizing signal is recorded and the information signal recording sector and the feeding speed and tilt of the tape are corrected while the reproducing signal of the synchronizing signal recording sector is detected.

70. 发明专利

JPS621135A OPTICAL CARD INFORMATION RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS621135A
公开(公告)日：1987-01-07
申请号：JP13774485
申请日：1985-06-26
申请人： HITACHI LTD
发明人： SASAKI HIROSHI , MIYAMOTO NORIFUMI , SATO YOSHIO , SHIMADA SATOSHI , KOYANAGI HIROAKI , NIHEI HIDEKI , TSUBOI NOBUYOSHI , OKADA TEIGO , ITO TETSUO , NAGAI HAJIME
IPC分类号： G11B7/00 , G11B7/0033 , G11B7/0055 , G11B7/125
摘要： PURPOSE:To reproduce and erase exactly high density recording information without always depending on a tracking signal, by changing a spot shape of an irradiated light. CONSTITUTION:A photodetector 61 is provided with four split photodetecting sensors F1-F4, and detects a spot shape of an optical beam which is irradiated to a position of a point P of an optical card 2. For instance, in case of a spot of a true circle, it can be discriminated by constituting it in advance so as to become equal to each photodetecting quantity of the photodetecting sensors F1-F4, and by providing furthermore plural pieces of photodetecting sensors, a complicated spot shape can also be detected. An optical spot discriminating circuit 62 discriminates a shape of an optical spot which is photodetected by the photodetector 61, by detecting photodetecting quantities F1p-F4p of the photodetecting sensors F1-F4, by which a condition of an irradiated spot of the point P of the optical card 2 is known, although it is indirect. Also, when it is detected that the irradiated spot of the point P is not a necessary shape, a spot shape control output 63 is generated, and the constitution of an objective lens 8 is varied so as to conform to an object condition.

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