JPS6460863A - Optical disk device - Google Patents

Optical disk device

Info

Publication number
JPS6460863A
JPS6460863A JP21720487A JP21720487A JPS6460863A JP S6460863 A JPS6460863 A JP S6460863A JP 21720487 A JP21720487 A JP 21720487A JP 21720487 A JP21720487 A JP 21720487A JP S6460863 A JPS6460863 A JP S6460863A
Authority
JP
Japan
Prior art keywords
disk
time
rotating speed
reproduction
supplied
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP21720487A
Other languages
Japanese (ja)
Inventor
Yutaka Tanahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP21720487A priority Critical patent/JPS6460863A/en
Publication of JPS6460863A publication Critical patent/JPS6460863A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Rotational Drive Of Disk (AREA)

Abstract

PURPOSE:To realize stable pit formation at the time of recording and fast access at the time of reproduction, by setting the rotating speed of a disk at the one inversely proportional to the diameter of the disk at the time of recording information, and operating a device at constant rotating speed at the time of reproducing the information. CONSTITUTION:An optical disk medium 6 is rotated by a motor 8 controlled by a disk rotation control circuit 3 at the time of recording and reproduction. To a variable clock generation circuit 14 in the disk rotation control circuit 3, targeted track address information projected by a light beam is supplied, and a variable rotary clock inversely proportional to the diameter of the disk is generated, and is supplied to the input on one side of a selector circuit 15. To the input on the other side of the selector circuit 15, a fixed rotary clock with a constant frequency is supplied, and either the fixed rotary clock or the variable rotary clock is selected by a mode switching signal. And in a write mode, the rotating speed inversely proportional to the diameter of the disk is set, and in a readout mode, the constant rotating speed is set. In such a way, it is possible to realize the stable pit formation and the fast access at the time of reproduction.
JP21720487A 1987-08-31 1987-08-31 Optical disk device Pending JPS6460863A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21720487A JPS6460863A (en) 1987-08-31 1987-08-31 Optical disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21720487A JPS6460863A (en) 1987-08-31 1987-08-31 Optical disk device

Publications (1)

Publication Number Publication Date
JPS6460863A true JPS6460863A (en) 1989-03-07

Family

ID=16700498

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21720487A Pending JPS6460863A (en) 1987-08-31 1987-08-31 Optical disk device

Country Status (1)

Country Link
JP (1) JPS6460863A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05189889A (en) * 1991-07-25 1993-07-30 Teac Corp Digital disc reproducing system
JPH0636289A (en) * 1992-07-14 1994-02-10 Matsushita Electric Ind Co Ltd Cd-rom apparatus
US5521895A (en) * 1994-07-28 1996-05-28 Teac Corporation Optical disk reproducing apparatus for controlling the rotational speed of a spindle motor between a CLV control and a CAV control
US5528574A (en) * 1992-03-09 1996-06-18 Hitachi, Ltd. Disk reproducing apparatus capable of increasing speed of access to disks recorded at constant linear velocity
JPH0973715A (en) * 1995-06-26 1997-03-18 Matsushita Electric Ind Co Ltd Optical disc recording / reproducing method and optical disc apparatus
JPH09219025A (en) * 1996-02-15 1997-08-19 Nec Corp Optical recording and reproducing device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05189889A (en) * 1991-07-25 1993-07-30 Teac Corp Digital disc reproducing system
US5528574A (en) * 1992-03-09 1996-06-18 Hitachi, Ltd. Disk reproducing apparatus capable of increasing speed of access to disks recorded at constant linear velocity
JPH0636289A (en) * 1992-07-14 1994-02-10 Matsushita Electric Ind Co Ltd Cd-rom apparatus
US5521895A (en) * 1994-07-28 1996-05-28 Teac Corporation Optical disk reproducing apparatus for controlling the rotational speed of a spindle motor between a CLV control and a CAV control
JPH0973715A (en) * 1995-06-26 1997-03-18 Matsushita Electric Ind Co Ltd Optical disc recording / reproducing method and optical disc apparatus
USRE38704E1 (en) 1995-06-26 2005-02-15 Matsushita Electric Industrial Co., Ltd. Optical disk recording method employing a plurality of recording areas and apparatus therefor
USRE41469E1 (en) 1995-06-26 2010-08-03 Panasonic Corporation Optical disk recording method employing a plurality of recording areas and apparatus therefor
JPH09219025A (en) * 1996-02-15 1997-08-19 Nec Corp Optical recording and reproducing device

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