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1. 发明专利

CA1196098A OPTICAL MEMORY APPARATUS 未知
公开(公告)号：CA1196098A
公开(公告)日：1985-10-29
申请号：CA416313
申请日：1982-11-25
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , UNO MOTOO , MURAOKA KOUJI , TAKASAGO MASAHIRO , MIZOGUCHI YASUMITSU , KANEDA TOKUYA
IPC分类号： G11B7/00
摘要： : In an optical memory apparatus predetermined information is optically recorded on a recording medium along guide grooves previously formed and can then be played back. The invention is concerned with improvements in apparatus for accurately positioning the light beam at a desired target guide groove. Using a tracking signal and a signal indicating the quantity of reflected light at the time at which a projected light beam passes across the guide grooves, the directions in which the light beam passes across the guide grooves and the number of guide grooves to be passed are detected. Seek control is performed by adding and subtracting the numbers of the guide grooves to be passed, depending upon the directions of passage, and fine positioning is thereafter performed using this tracking signal. The invention provides high precision of accessing in a system that can have a track density one or two orders of magnitude higher than a conventional magnetic disc.

2. 发明专利

DE3278981D1 OPTICAL MEMORY APPARATUS 未知
公开(公告)号：DE3278981D1
公开(公告)日：1988-10-06
申请号：DE3278981
申请日：1982-11-25
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , UNO MOTOO , MURAOKA KOUJI , TKASAGO MASAHIRO , MIZOGUCHI YASUMITSU , KANEDA TOKUYA
IPC分类号： G11B7/08 , G11B7/085 , G11B7/09 , G11B17/00 , G11B27/00
摘要： An optical memory apparatus wherein predetermined information is optically recorded on a recording medium along guide grooves previously formed and then played back, comprises: projecting means for projecting a laser beam on the recording medium, light reception means for receiving reflected light from the recording medium, means for generating a tracking error signal on the basis of an output from the light reception means, first means [26(a)], for enveloping upper an information signal [512] obtained from the light reception means, second means [202] for generating a signal corresponding to the direction of passage each time the light beam passes through the guide groove, on the basis of the output from said first means and the tracking error signal, third means [203 - 209] for detecting a difference between the guide groove where the light beam exists and a target guide groove on the basis of the output from said second means and for generating a first control signal for controlling the position of the light beam in correspondence with said difference, light beam position-control means [1, 210,251] for bringing the light beam near to the target guide groove in response to the first control signal.

3. 发明专利

DE3279453D1 ACCESS DEVICE FOR POSITIONING A LIGHT BEAM TO A DESIRED GUIDE GROOVE OF AN OPTICAL MEMORY APPARATUS 未知
公开(公告)号：DE3279453D1
公开(公告)日：1989-03-23
申请号：DE3279453
申请日：1982-11-25
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , UNO MOTOO , MURAOKA KOUJI , TKASAGO MASAHIRO , MIZOGUCHI YASUMITSU , KANEDA TOKUYA
IPC分类号： G11B7/08 , G11B27/00

4. 发明专利

DE3364892D1 OPTICAL INFORMATION PROCESSOR 未知
公开(公告)号：DE3364892D1
公开(公告)日：1986-09-04
申请号：DE3364892
申请日：1983-04-29
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , TSUNODA YOSHITO , HUNO TAKAKAZU , TAKASAGO MASAHIRO , MIZOGUCHI YASUMITSU
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/007 , G11B7/09 , G11B7/125 , G11B19/04 , G11B20/10 , G11B20/12 , G11B20/18 , G11B27/36 , G11B7/12

5. 发明专利

DE3232682A1 未知
公开(公告)号：DE3232682A1
公开(公告)日：1983-05-19
申请号：DE3232682
申请日：1982-09-02
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , MIZOGUCHI YASUMITSU , TAKASAGO MASAHIRO , KANEDA TOKUYA , TSUNODA YOSHITO
IPC分类号： G11B7/125 , H01S5/068 , H01S5/0683 , H01S3/13 , H01S3/18
摘要： A driving circuit for driving a semiconductor laser by a driving signal containing a pulse signal representing given information and superposed on a DC bias signal includes means for monitoring intensity of laser light emitted when the DC bias is applied, and means for monitoring the intensity of laser light emitted when the pulse signal is applied. The DC bias signal and the pulse signal are varied in dependence on the result of comparisons between the outputs of the monitoring means and respective predetermined reference values.

6. 发明专利

DE3279551D1 METHOD OF DETECTING LIGHT SPOT CONTROL SIGNAL 未知
公开(公告)号：DE3279551D1
公开(公告)日：1989-04-20
申请号：DE3279551
申请日：1982-07-27
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , SHIGEMATSU KAZUO , TAKASAGO MASAHIRO , MIZOGUCHI YASUMITSU , TSUTSUMI ZENJI , TSUNODA YOSHITO , UNO MOTOO HITACHI-DAINIKYOSHIN
IPC分类号： G02B7/28 , G11B7/08 , G11B7/09 , G11B7/00
摘要： A method of detecting a light spot control signal is disclosed in which, when information if reproduced from an optical disk (3) for optically recording information, a signal level (21, 46, 62) obtained at a high-reflectivity portion of the optical disk is taken out of a signal (25) reproduced from the optical disk, and is used as a control signal, which controls a light spot so that it tracks information stored in the optical disk.

7. 发明专利

AT36917T 未知
公开(公告)号：AT36917T
公开(公告)日：1988-09-15
申请号：AT82110907
申请日：1982-11-25
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , UNO MOTOO , MURAOKA KOUJI , TKASAGO MASAHIRO , MIZOGUCHI YASUMITSU , KANEDA TOKUYA
IPC分类号： G11B7/08 , G11B27/00

8. 发明专利

JPH0719393B2 失效
公开(公告)号：JPH0719393B2
公开(公告)日：1995-03-06
申请号：JP7368092
申请日：1992-03-30
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , TSUNODA YOSHITO , FUNO TAKAKAZU , TAKASAGO MASAHIRO , MIZOGUCHI YASUMITSU
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/09 , G11B7/125

9. 发明专利

JPH04219635A INFORMATION STORAGE DEVICE 失效
公开(公告)号：JPH04219635A
公开(公告)日：1992-08-10
申请号：JP7962291
申请日：1991-04-12
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , UNO MOTOO , MURAOKA KOJI , TAKASAGO MASAHIRO , MIZOGUCHI YASUMITSU , KANEDA NORIYA
IPC分类号： G11B7/095 , G11B7/085 , G11B7/09 , G11B27/10
摘要： PURPOSE:To stably detect the passing direction and the number of passing tracks regardless of the presence of the information recording and to attain the high-definition positioning by using an envelope signal and a tracking signal. CONSTITUTION:The optical head 2 is moved integrally and moved largely in a disk radius direction and by using a swing arm 1 capable of keeping the positioning accuracy of about 0.1mum, a seek control and a follow-up control are conducted with a single actuator. The reflected light amount detected with the optical head 2 is converted optoelectrically with a photo-detector (not shown) and inputted to a tracking error-signal generation circuit 201 and a total reflected light amount signal generation circuit 200. From the generation circuit 201 a tracking error signal 52 is obtained and from the generation circuit 200 a total reflected light amount signal 51 is obtained. Both signals 52, 51 are inputted to the edge signal generation circuit 202 generating a plus direction edge signal 54 and a negative direction edge signal 53 and is calculated and the high-accuracy positioning is conducted.

10. 发明专利

JPH0348577B2 失效
公开(公告)号：JPH0348577B2
公开(公告)日：1991-07-24
申请号：JP13858381
申请日：1981-09-04
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , SHIGEMATSU KAZUO , TAKASAGO MASAHIRO , MIZOGUCHI YASUMITSU , TSUTSUMI ZENJI , TSUNODA YOSHITO , UNO MOTOO
IPC分类号： G02B7/28 , G11B7/08 , G11B7/09

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