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1. 发明专利

JPH08180464A OPTICAL DISK RECORDING MEDIUM, ITS LOADING METHOD AND OPTICAL DISK DEVICE 失效
公开(公告)号：JPH08180464A
公开(公告)日：1996-07-12
申请号：JP21566895
申请日：1995-08-24
申请人： HITACHI LTD , HITACHI MAXELL
发明人： FUJIMOTO NOBUYUKI , ABE SHINICHI , TSUNODA YOSHITO , SHIGEMATSU KAZUO , KANAZAWA YASUNORI , SUGIYAMA TOSHINORI , IKEGAKI TETSUO
IPC分类号： G11B23/00 , G11B7/24 , G11B17/028
摘要： PURPOSE: To provide an optical disk recording medium capable of magnetically clamping the medium suitable for making an optical disk device thin and without causing retardation. CONSTITUTION: In the optical disk recording medium on which information is recorded optically, substrates 1, 1' provided with a hold part 6 and a recording layer and a metal piece or a magnetic body 7 held by the hold part 6 and attracted to a spindle are provided. The hold part 6 is made of a material with a coefft. of thermal expansion nearly equal to the substrates 1, 1'.

2. 发明专利

JPS63171445A OPTICAL MASTER DISK MANUFACTURING EQUIPMENT 失效
公开(公告)号：JPS63171445A
公开(公告)日：1988-07-15
申请号：JP161687
申请日：1987-01-09
申请人： HITACHI LTD , HITACHI MAXELL
发明人： ITO SHO , WATANABE HITOSHI , YASUI TOSHIAKI , TSUNODA YOSHITO
IPC分类号： G11B7/135 , G11B7/09 , G11B7/26
摘要： PURPOSE:To attain the position control of a light spot on a photosensitive layer by controlling one or two incident angles to a prescribed value. CONSTITUTION:The light from a laser light source 1 is separated by a splitter 2 and subjected to intensity modulation according to the signal by an optical modulation deflector 4 and an optical modulator 3. Two recording lights 100, 200 receiving modulation and deflection are synthesized by a beam splitter 5 and formed as two light spots on the photosensitive layer 13 on a disk 12. A beam sampler 17 is placed between a lens 9 and a mirror 11 and the extracted two recording lights are formed on photodetectors 19, 19'. An output corresponding to a deviation from the center of the detectors 19, 19' is obtained by arithmetic units 20, 20' and each recording light is deflected to control the position of the light spot on the photosensitive layer 13.

3. 发明专利

JPS6246446A OPTICAL DISK RECORDING MEDIUM 失效
公开(公告)号：JPS6246446A
公开(公告)日：1987-02-28
申请号：JP18424385
申请日：1985-08-23
申请人： HITACHI LTD , HITACHI MAXELL
发明人： FUJIMOTO NOBUYUKI , ABE SHINICHI , TSUNODA YOSHITO , SHIGEMATSU KAZUO , KANAZAWA YASUNORI , SUGIYAMA TOSHINORI , IKEGAKI TETSUO
IPC分类号： G11B7/24 , G11B17/028 , G11B23/00
摘要： PURPOSE:To enable magnetic clamping without generating retardation and to reduce the thickness of a device by depositing a metallic piece or magnetic material on a disk while said piece or material is held liberated from a substrate. CONSTITUTION:The cause for the generation of the retardation in the case of using magnetic clamping lies in that the metallic piece or the like having the coefft. of thermal expansion different from the coefft. of thermal expansion of the substrate is directly adhered to the substrate. The annular metallic piece or magnetic material 7 is thereupon deposited on the disk while said piece or material is held liberated from the substrate 1 by using annular L-shaped members 6, 6' fixed to the substrate 1. The magnetic clamping is thereby made possible without generating the retardation by which mechanical clamping is eliminated and the reduction in the thickness of the device is made possible.

4. 发明专利

JPH01263964A OPTICAL DISK RECORDING AND REPRODUCING SYSTEM 失效
公开(公告)号：JPH01263964A
公开(公告)日：1989-10-20
申请号：JP8906088
申请日：1988-04-13
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MAEDA TAKESHI , WATANABE HITOSHI , TSUNODA YOSHITO
IPC分类号： G11B7/00 , G11B7/004 , G11B11/10 , G11B11/105
摘要： PURPOSE:To access data at a high speed without producing out-of-track by providing one pre-pit pattern for synchronization at every plural pre-pit pairs and detecting positional information as well as the phase of a displaced pit. CONSTITUTION:Pit patterns are repeatedly provided at every section (n), (n+1), etc., which are punctuation units of data along one track on the surface of a disk and an ID section having address information and other control information is provided at the leading section of each sector (n). In addition, pre-pits which slightly meander on both right and left sides against the center of the track are arranged and data are recorded in the sections between the pre-pits. Moreover, marks for synchronization are formed on the disk in the form of pre-pits and the phase of the meandering and positions of the pre-pits are decided by detecting the marks and, furthermore, empty areas are provided around the pre-pits. While recording pulses are dislocated from a magnetic domain formed in a magnetic field modulation overwrite system, self-clocking is performed for producing reproducing clocks, since the dislocation between the magnetic domain and recording pulses are fixed. Therefore, data can be accessed without out-of-track.

5. 发明专利

JPS62119747A INFORMATION RECORDING DISK FOR MAGNETIC CRAMP 失效
公开(公告)号：JPS62119747A
公开(公告)日：1987-06-01
申请号：JP25785585
申请日：1985-11-19
申请人： HITACHI MAXELL , HITACHI LTD
发明人： KANAZAWA YASUNORI , SUGIYAMA TOSHINORI , IKEGAKI TETSUO , SHIGEMATSU KAZUO , TSUNODA YOSHITO , ABE SHINICHI , FUJIMOTO NOBUYUKI
IPC分类号： G11B7/24 , G11B23/00
摘要： PURPOSE:To perform the normal recording and reproducing of information signals under any temperature conditions and moisture conditions, by loosely putting an attracting member made of a magnetic substance in a fitting hole provided in a transparent base plate. CONSTITUTION:Since a small-diameter connecting rod 7 is loosely put in the fitting hole 4 of an information recording disk 1, the connecting rod 7 is never pressed against the wall surface of the fitting hole 4 even if dimension changes take place in transparent base plates 2 and 2a and magnetic attracting member 5 due to a temperature change and moisture change. Therefore, no distortion is produced in the transparent base plate 1 and, as a result, such a problem that the occurrence of wavefront aberration or a change in plane of polarization never takes place and information signals can normally be recorded and reproduced even when this disk 1 is used in any temperature ranges.

6. 发明专利

JPH09120558A OPTICAL INFORMATION PROCESSOR 失效
公开(公告)号：JPH09120558A
公开(公告)日：1997-05-06
申请号：JP22206996
申请日：1996-08-23
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , TSUNODA YOSHITO , FUNO TAKAKAZU , TAKASAGO MASAHIRO , MIZOGUCHI YASUMITSU
IPC分类号： G11B7/09 , G11B7/125
摘要： PROBLEM TO BE SOLVED: To provide an optical information processing method detecting that a light spot is off from a track with excellent reliability, preventing data destruction and also warranting data record. SOLUTION: This device uses a light source emitting a light beam, a recording medium having a track, an optical system forming the light beam on the recording medium as a light spot and recording information, a regenerative optical system 6 light receiving the light beam after the recording medium is irradiated and a track shift detection means 13 forming a track shift signal 11 showing a position shift amount between the track center and the light spot center by an output from a light receiving means. The information is recorded along the track while controlling the optical system so that the light beam follows up the track based on the track shift signal 11. Then, a track-off error signal showing that a track-off that the position shift amount between the track center and the light spot center exceeds an allowable amount occurs is outputted when the track shift signal 11 exceeds a prescribed value. The recording of the information by the light beam is stopped by the output of the track-off error signal, and the information is recorded on the place excepting the place causing the crack-off on the recording medium.

7. 发明专利

JP2555239B2 失效
公开(公告)号：JP2555239B2
公开(公告)日：1996-11-20
申请号：JP28756391
申请日：1991-11-01
申请人： HITACHI LTD
发明人： MYAUCHI TOSHIMITSU , TSUNODA YOSHITO , MAEDA TAKESHI
IPC分类号： G11B7/125

8. 发明专利

JPH0845079A METHOD AND DEVICE FOR PROCESSING OPTICAL INFORMATION 失效
公开(公告)号：JPH0845079A
公开(公告)日：1996-02-16
申请号：JP20423195
申请日：1995-08-10
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , TSUNODA YOSHITO , FUNO TAKAKAZU , TAKASAGO MASAHIRO , MIZOGUCHI YASUMITSU
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/09 , G11B7/125
摘要： PURPOSE:To prevent the destruction of data and to assure the data by stopping recording information at the time of outputting a track deviation signal being in excess of an allowable deviation amt. or occasionally recording the information in another place and resuming the recording if no track deviation takes place when the information is reproduced again. CONSTITUTION:Information of a reproducing optical system 6 is inputted to a detecting means 13 to send out the track deviation signal. This signal 11 is inputted to a window comparator 14, and when the signal is deviated from a specified level range, the signal is made to be '0', and tracking is carried on with a signal 15 under the state of '1'. This signal may be a control signal for showing a closing and opening command of a tracking servo system. An output '1' of inverting '0' is passed through a gate 16 to be outputted as the track deviation signal 9. This signal is inputted to an FF 41 to be set to its rise, and is used as a gate control signal 17 for a recording signal. By this constitution, a track deviation is detected to stop recording, and this state information can be given to a control device. When the track deviation signal generated due to dust and a flaw is detected by the window comparator 14, its pulse width is narrow, so that, if this is below a prescribed time width, the signal is prevented from being inputted to the gate 16.

9. 发明专利

JPH07219388A IMAGE FORMING METHOD AND IMAGE FORMING DEVICE 失效
公开(公告)号：JPH07219388A
公开(公告)日：1995-08-18
申请号：JP1540494
申请日：1994-02-09
申请人： HITACHI LTD
发明人： OKANO MAMORU , ONOSE ATSUSHI , SUGITA TATSUYA , ARIMOTO AKIRA , MITSUYA TERUAKI , TSUNODA YOSHITO , HOSHI NOBUYOSHI
IPC分类号： B41J2/44 , B41J2/385 , G03G15/05 , G03G17/00
摘要： PURPOSE:To make fine particles of an image forming medium float in the air by the pressure of light and to maintain the particles as floating, and to move the fine particles of the image forming medium in the direction of the recording medium for printing. CONSTITUTION:A light barrier 2 is formed and fine particles 3 of an image forming medium are maintained in this light barrier 2. Then, the particles 3 of the image forming medium are irradiated with light from a driving means 6 for fine particles disposed facing the recording medium 7 with the light barrier 2 interposed. The fine particles 3 irradiated with light are pressed through the light barrier 2 to deposit on the recording medium 7. Thereby, an image is formed on the recording medium 7. The excess particles 3 not used for printing in the fine particles 3 of the image forming medium supplied from the fine particle supply device 4 on the optical barrier 2 are recovered by a particle recovering device 5.

10. 发明专利

JPH06208727A REPRODUCING METHOD FOR OPTICAL INFORMATION 失效
公开(公告)号：JPH06208727A
公开(公告)日：1994-07-26
申请号：JP29782293
申请日：1993-11-29
申请人： HITACHI LTD
发明人： MIYAUCHI TOSHIMITSU , TSUNODA YOSHITO , MAEDA TAKESHI
IPC分类号： G11B7/125
摘要： PURPOSE:To keep the output of a semiconductor laser being a light source constant without lowering the working efficiency of light by detecting luminous flux taken out from a light separation element through a photodetector. CONSTITUTION:Laser luminous flux is condensed by a condensing lens 3, and the luminous flux passes through a prism 4 and galvanomirror 5 and then through a stop-down lens 6 and the galvanomirror 5 so that information is reproduced. In this case, reflected luminous flux 9 other than luminous flux going toward a recording medium 7 is generated in the luminous flux from a semiconductor laser 1. Accordingly, the reflected luminous flux 9 from the prism 4 is received by a photodetection element 10 and the output of the element 10 is fed back to a laser-driving power supply 2 through an amplifier 11. Then, an optical output signal (output of the amplifier 11) 23 is compared with a setpoint signal 22 corresponding to a laser output by a comparator 21 so that an optical output is made constant.

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