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1. 发明专利

CA2021155A1 OPTICAL DISK RECORDING AND REPRODUCING APPARATUS 未知
公开(公告)号：CA2021155A1
公开(公告)日：1991-01-15
申请号：CA2021155
申请日：1990-07-13
申请人： MATOBA, HIROTSUGU , NOMURA, MASARU , DEGUCHI, TOSHIHISA , TERASHIMA, SHIGEO
发明人： MATOBA, HIROTSUGU , NOMURA, MASARU , DEGUCHI, TOSHIHISA , TERASHIMA, SHIGEO
IPC分类号： G11B7/085
摘要： The optical disk recording and reproducing apparatus includes (1) an optical head, (2) a linear motor for moving the optical head in a radial direction of an optical disk (3) a position detection sensor for detecting a position of the optical head, (4) a speed detector for detecting a moving speed of the optical head, (5) a CPU for calculating an access distance, based on the present position of the optical head and a designated track, in accordance with an output of the position detection sensor, (6) a ROM for generating a table value for an adjustable target speed of the optical head in accordance with the distance, (7) a speed offset memory for storing a speed offset value for adjusting an error in the access distance, (8) a coarse access control device for controlling the linear motor to move the optical head, based on an error signal obtained from a difference between the adjustable target speed and an actual speed of the optical head detected by the speed detector, before the optical head reaches a switching point located just before the designated track in a coarse access, the adjustable target speed being obtained by adding or subtracting the speed offset value stored in the speed offset memory to or from the table value generated by the ROM, and for setting the adjustable target speed to "0", after the optical head passes the switching point, and (9) a fine access control device for judging whether the optical head is positioned on the designated track upon completion of the coarse access, and for performing a fine access, controlling the linear motor to move the optical head to a vicinity of the designated track, when the optical head is not positioned on the designated track. With such an arrangement, the accuracy of the coarse access can be improved and time required for the coarse access can be reduced. Another optical disk recording and reproducing device further includes a speed offset value correcting device for correcting the speed offset value released in accordance with an access error in the coarse access when a distance between a position of the optical head and the designated track is more than a reference value upon completion of the coarse access. The speed offset value is accordingly corrected by a learning control, and this further improves the accuracy of the coarse access, saving the overall access time.

2. 发明专利

CA2020059A1 DISK RECORDING AND REPRODUCING DEVICE 未知
公开(公告)号：CA2020059A1
公开(公告)日：1990-12-31
申请号：CA2020059
申请日：1990-06-28
申请人： MAEDA, SHIGEMI , TERASHIMA, SHIGEO , ISHIKAWA, TOSHIO , DEGUCHI, TOSHIHISA
发明人： MAEDA, SHIGEMI , TERASHIMA, SHIGEO , ISHIKAWA, TOSHIO , DEGUCHI, TOSHIHISA
IPC分类号： G11B7/0037 , G11B11/105 , G11B19/04 , G11B20/00 , G11B20/10 , G11B20/12 , G11B20/18 , G11B27/034 , G11B27/036 , G11B27/038 , G11B27/10 , G11B27/11 , G11B27/30 , G11B27/32 , G11B27/34 , G11B27/36
摘要： A disk recording and reproducing device records and reproduces information on and from a magneto-optical disk having absolute addresses and including an information recording area wherein pieces of information entered from external devices are recorded and a TOC area wherein additional information with respect to each piece of the information recorded in the information recording area is recorded. The device includes operation keys for being operated by the user, a TOC memory for storing therein read/write control information for desired pieces of information entered through the operation keys, an optical head and a magnetic coil for recording in the TOC area the contents stored in the TOC memory as additional information and a controller for controlling read/write operation to the disk according to the read/write control information. With the arrangement, the user can recognize necessary/unnecessary information and defective parts in the disk, and therefore make effective use thereof as well as maintaining secrecy of the information. A disk recording and reproducing device also includes a peak level detection circuit for detecting peak levels of music information, a TOC memory for storing therein peak level information with respect to the peak levels, and an optical head and a magnetic coil for recording in the TOC area the contents stored in the TOC memory as additional information, thereby permitting the user to readily perform preferable copying operation. A disk recording and reproducing device further comprises an optical head and a magnetic coil whereby an end mark is recorded in the rear end part of the additional information, and when a new piece of information is recorded in the information recording area, additional information with respect to the new piece of information is overwritten to add onto an end mark already recorded in the TOC area, and an end mark is newly recorded in a rear end part of the overwritten additional information. Thus, required reproducing time for the TOC area can be shortened. A disk recording and reproducing device includes an optical head for applying a light beam to the disk in recording information, operation keys, memory means wherein an absolute address corresponding to the time when the operation key is operated to initiate recording is stored, and optical head drive control means for moving the optical head back to a vicinity of a position indicated by the absolute address stored in the memory means and for keeping the optical head in a stand-by state by making it perform track-jumps at a position slightly before the position indicated by the absolute address, when re-recording operation of information is performed. Therefore, in re-recording information, the optical head is readily accessed to a vicinity of a recording start position of the former information.

3. 发明专利

CA2017500A1 RECORDING AND REPRODUCING DEVICE 未知
公开(公告)号：CA2017500A1
公开(公告)日：1990-11-26
申请号：CA2017500
申请日：1990-05-24
申请人： TERASHIMA, SHIGEO , DEGUCHI, TOSHIHISA , KOJIMA, KUNIO , MAEDA, SHIGEMI
发明人： TERASHIMA, SHIGEO , DEGUCHI, TOSHIHISA , KOJIMA, KUNIO , MAEDA, SHIGEMI
IPC分类号： G11B7/004 , G11B7/007 , G11B11/105 , G11B19/04 , G11B27/034 , G11B27/036 , G11B27/11 , G11B27/32 , G11B27/34 , G11B27/36
摘要： A recording and reproducing device, which records and reproduces information on and from a rewritable recording medium having absolute addresses and comprising an information recording area wherein information entered from external devices is recorded and a TOC area wherein additional information with respect to the information recorded in the information recording area is recorded, comprises: an optical head and an electromagnet for recording information in the information recording area, and for recording in the TOC area the absolute addresses indicating at least the recording positions of information as additional information every time the information is recorded in the information recording area; a display section for graphically displaying the recorded and unrecorded ranges of the information recording area independently according to the absolute addresses recorded in the TOC area with respect to the recording positions of each piece of information; warning means for warning to show that a position has already been occupied by referring to the additional information recorded in the TOC area when it is instructed to record new information in the position of the information recording area where another information has already been recorded; first editing means for erasing the additional information from the TOC area with respect to any information within the information recording area when the information is completely erased therefrom; and second editing means for detecting a remaining amount of any information when the information is partially erased from the information recording area, for recording in the TOC area absolute addresses indicating the recording positions of the remaining information part in the TOC area, after replacing the absolute addresses indicating the recording positions of its original information with those indicating the recording positions of the remaining information part when the remaining amount is not less than a predetermined value, and for erasing the additional information of the partially erased information from the TOC area when the remaining amount of the partially erased information is less than the predetermined value. With the arrangement, even if the stored additional information is lost due to the cut-off of the power source, in the recording operation thereafter, the user can accurately recognize the recording conditions of the information recording area, and such trouble as to record another information overlapping with information already recorded is perfectly prevented, and further the user can recognize space domains easily and accurately.

4. 发明专利

CA2014535A1 APPARATUS FOR RECORDING AND REPRODUCING INFORMATION ON AND FROM AN OPTICAL DISK 未知
公开(公告)号：CA2014535A1
公开(公告)日：1990-10-13
申请号：CA2014535
申请日：1990-04-12
申请人： DEGUCHI, TOSHIHISA , FUJI, HIROSHI , TERASHIMA, SHIGEO
发明人： DEGUCHI, TOSHIHISA , FUJI, HIROSHI , TERASHIMA, SHIGEO
IPC分类号： G11B7/00 , G11B7/004 , G11B7/005 , G11B7/007 , G11B7/09 , G11B20/12 , G11B20/14 , G11B21/10 , G11B27/30
摘要： An apparatus for recording and reproducing information on and from an optical disk in which at least one optical beam and a reference clock signal are used. The optical disk comprises recording tracks which are divided into a plurality of blocks and concentrically arranged along the radial direction. The apparatus comprises: a block judging unit for judging which one of the blocks is the one which is currently impinged by the optical beam; a clock signal generator for generating a plurality of clock signals which are different in frequency from each other; and a clock signal selecting unit for selecting one of the clock signals as the reference clock signal, on the basis of the judgment of the block judging unit.

5. 发明专利

CA2022192A1 OPTICAL DISK RECORDING/REPRODUCING DEVICE 未知
公开(公告)号：CA2022192A1
公开(公告)日：1991-02-05
申请号：CA2022192
申请日：1990-07-27
申请人： MAEDA, SHIGEMI , FUJI, HIROSHI , TERASHIMA, SHIGEO , DEGUCHI, TOSHIHISA
发明人： MAEDA, SHIGEMI , FUJI, HIROSHI , TERASHIMA, SHIGEO , DEGUCHI, TOSHIHISA
IPC分类号： G11B7/004 , G11B19/247 , G11B27/034 , G11B27/036 , G11B27/10 , G11B27/11 , G11B27/19 , G11B27/24 , G11B27/32 , H04N5/85 , H04N5/92
摘要： An optical disk recording/reproducing device in accordance with the present invention has a controller that, during the recording, performs the rotation control of the optical disk in Constant Linear Velocity according to reproduced signals of pre-recorded information that was preliminary recorded on the optical disk, during the reproduction, performs the rotation control according to reproduced signals of recorded information, and when the rotation control based on the reproduced signals of the recorded information is infeasible, switches the rotation control and performs the rotation control based on the reproduced signals of the pre-recorded information during the reproduction also. As a result, a suitable and appropriate CLV control may be executed during the recording and during the reproduction.

6. 发明专利

CA2019936A1 SEMICONDUCTOR LASER DRIVING CIRCUIT 未知
公开(公告)号：CA2019936A1
公开(公告)日：1990-12-28
申请号：CA2019936
申请日：1990-06-27
申请人： NUMATA, TOMIYUKI , KOJIMA, KUNIO , DEGUCHI, TOSHIHISA , TERASHIMA, SHIGEO
发明人： NUMATA, TOMIYUKI , KOJIMA, KUNIO , DEGUCHI, TOSHIHISA , TERASHIMA, SHIGEO
IPC分类号： G11B7/125 , G11B7/126 , H01S5/068
摘要： The invention provides an improvement of the conventional laser driving circuit mainly including a control logic circuit (11), a reproducing power producing circuit (13), and a recording power producing circuit (12) for preventing a recording film of a disk from being damaged by a laser in a reproducing mode. The improved respect is addition of a voltage monitoring circuit (23) and a bypass transistor (21) for an abnormal signal. The voltage monitoring circuit monitors (23) a voltage drop caused in the control logic circuit and supplies a voltage abnormality indicating signal, thereby causing the bypass transistor (21) to be conductive for allowing the abnormal signal to be flown therethrough.

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