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1. 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.

2. 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

3. 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.

4. 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.

5. 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.

6. 发明专利

JPH05143976A MAGNETIC RECORDING MEDIUM AS WELL AS INFORMATION RECORDING METHOD AND INFORMATION RECORDER 失效
公开(公告)号：JPH05143976A
公开(公告)日：1993-06-11
申请号：JP72191
申请日：1991-01-08
申请人： HITACHI LTD
发明人： AKAGI KYO , TSUNODA YOSHITO , FUTAMOTO MASAAKI , KUGIYA FUMIO , MIYAMURA YOSHINORI , TAKANO KOJI , MATSUDA YOSHIFUMI , SUZUKI MIKIO , NAKAO TAKESHI , MUNEMOTO TAKAYUKI , FUKUOKA HIROTSUGU , TAKAGAKI ATSUSUKE
IPC分类号： G11B5/02 , G11B5/596 , G11B5/66 , G11B5/73 , G11B5/74 , G11B5/82
摘要： PURPOSE:To increase the memory capacity of the information recorder by a contact recording system. CONSTITUTION:This magnetic recording medium is constituted by providing a substrate having a rugged shape regularly formed with the direction orthogonal with data tracks on a medium 10 substrate and a magnetic layer 12 for recording data on the base of recording grooves 11 elongating in the progressing direction of the information tracks having the recessed shape formed mentioned above. The slider 14 internally contg. a magnetic head 16 slides on a gliding (sliding) surface in such a manner that the magnetic heasd16 comes on the recording grooves 11 and has is possible.

7. 发明专利

JPH0536208A REPRODUCTION ONLY DISK DEALING WITH MULTIMEDIA, ITS RECORDING METHOD AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0536208A
公开(公告)日：1993-02-12
申请号：JP13743391
申请日：1991-06-10
申请人： HITACHI LTD
发明人： OTAKE MASATOSHI , HAMAMOTO NOBUO , TSUNODA YOSHITO
IPC分类号： G11B7/00 , G11B7/004 , G11B20/10 , G11B20/12 , G11B20/18 , H04N5/85
摘要： PURPOSE:To automatically correct a reading error bit for multimedia by adding an error correction code to a fixed bit number constituted of audio code data and a medium information code. CONSTITUTION:The medium information is inserted into the low-order 6 bits of each 16 bits of right/left audio information. The 16-bit information of right/ left channels is stored in the unit sector of a CD format as first and second channel information. An error correction code ECC, a start byte S and a control byte C are added at every specified byte of this channel information as used as a unit frame format of a CD standard. In order to digitally code the audio information even when the medium information is inserted into the low-order bits of the audio information. 10 to 14 bits are sufficient and a sound quality is not lowered. Thus, the code data is inputted into the error correction circuit with a ECC code and highly reliable medium information is reproduced.

8. 发明专利

JPH056260B2 失效
公开(公告)号：JPH056260B2
公开(公告)日：1993-01-26
申请号：JP18327087
申请日：1987-07-24
申请人： HITACHI LTD
发明人： MYAUCHI TOSHIMITSU , TSUNODA YOSHITO , MAEDA TAKESHI
IPC分类号： G11B7/125

9. 发明专利

JPH0386931A INFORMATION RECORDER 失效
公开(公告)号：JPH0386931A
公开(公告)日：1991-04-11
申请号：JP33924889
申请日：1989-12-27
申请人： HITACHI LTD
发明人： TSUNODA YOSHITO , MIYAUCHI TOSHIMITSU , SHIGEMATSU KAZUO
IPC分类号： G11B7/09 , G11B7/095
摘要： PURPOSE:To realize the recording of information which is simple and has high reliability and high accuracy by detecting a signal for focusing from the own reflected light of high output laser light for recording, simultaneously radiating low output laser light which is equal to or under a recording threshold before the emission of the high output laser light and executing focusing before the starting of the recording. CONSTITUTION:A laser is oscillated by the weak output equal to or under the recording threshold of a recording medium. Then, the automatic focusing is executed by detecting the light reflected from a disk 45 with the aid of a photodetector 48. At this time, since the output of the laser is weak, the recording is not executed and only the automatic focusing is executed. When the output of the laser light is raised under such a state, the recording of the information is started. By using a single semiconductor laser 40, radiating the low output laser light before the irradiation of the high output laser light corresponding to the recording information and executing the focusing in such a way, the recording can be always started under the state of focusing and the precise recording of the information can be executed. Besides, defocus caused by the interruption of the recording can be prevented from occurring.

10. 发明专利

JPH0228122B2 失效
公开(公告)号：JPH0228122B2
公开(公告)日：1990-06-21
申请号：JP4912682
申请日：1982-03-29
申请人： HITACHI LTD
发明人： YABUCHI KOICHI , TSUNODA YOSHITO , KANEDA NORYA , NAKAMURA SHIGERU
IPC分类号： G02B6/42 , G02B6/32 , H01S5/00 , H01S5/022 , H01S5/024
摘要： PURPOSE:To output parallel light with high precision by fixing a light source or lens to a fixed frame and fixing a member having a coefficient of thermal expansion different from the fixed frame in the position where the distance between the lens and the light source is more shortened the position where the fixed frame and member are fixed. CONSTITUTION:The light source device consists of a semiconductor laser frame 1 for fixing a semiconductor laser, a heat sink 3 for dissipating heat generated by the semiconductor laser, coupling lens 2 for converting laser light into parallel light, the fixed frame where the semiconductor laser frame 1 and coupling lens 2 are coupled fixedly, thermal-expansion absorbing damper 5 arranged between the coupling lens 2 fixed frame 4 in order to absorb variation in the distance between the coupling lens 2 and and a semiconductor light emission point due to thermal expansion, and adjusting screw 6 for adjusting the position of the coupling lens 2.

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