JPS6413274A - Optical disk device - Google Patents

Optical disk device

Info

Publication number
JPS6413274A
JPS6413274A JP16945987A JP16945987A JPS6413274A JP S6413274 A JPS6413274 A JP S6413274A JP 16945987 A JP16945987 A JP 16945987A JP 16945987 A JP16945987 A JP 16945987A JP S6413274 A JPS6413274 A JP S6413274A
Authority
JP
Japan
Prior art keywords
address
signal
track
track address
speed
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.)
Granted
Application number
JP16945987A
Other languages
Japanese (ja)
Other versions
JP2576132B2 (en
Inventor
Akihiro Gomi
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson 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 Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP62169459A priority Critical patent/JP2576132B2/en
Publication of JPS6413274A publication Critical patent/JPS6413274A/en
Application granted granted Critical
Publication of JP2576132B2 publication Critical patent/JP2576132B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To surely execute pull-in operation by suitably receiving a track address from a track address demodulation part, comparing it with a track address received last time and detecting the moving direction of an optical head. CONSTITUTION:An RF signal including an information signal is also received simultaneously with a track error signal by the optical head 2. The RF signal is outputted to an address demodulation circuit 11 and a PLL circuit 12 after being processed by an RF signal reproduction circuit 10 and synchronized with a clock signal. Then a clock used for the demodulation of the track address, a sector address and recording data is generated. By the address demodulation circuit 11, an address signal is fetched and demodulated. A CPU receives the track address (a) of the last time and track address (b) of this time and immediately obtains (b-a). When the speed of a VCM is slowed down and inverted soon after, the positive and the negative code of the (b-a) is inverted but before and after it, the speed is nearly zero. Therefore when positional control pull-in is executed at the inverting time of the speed or immediately after the inversion, the correct pull-in can be easily executed.
JP62169459A 1987-07-07 1987-07-07 Optical disk drive Expired - Lifetime JP2576132B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62169459A JP2576132B2 (en) 1987-07-07 1987-07-07 Optical disk drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62169459A JP2576132B2 (en) 1987-07-07 1987-07-07 Optical disk drive

Publications (2)

Publication Number Publication Date
JPS6413274A true JPS6413274A (en) 1989-01-18
JP2576132B2 JP2576132B2 (en) 1997-01-29

Family

ID=15886974

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62169459A Expired - Lifetime JP2576132B2 (en) 1987-07-07 1987-07-07 Optical disk drive

Country Status (1)

Country Link
JP (1) JP2576132B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5572919A (en) * 1992-12-22 1996-11-12 Kabushiki Kaisha Komatsu Seisakusho Apparatus for controlling pressure in a cylinder chamber of a hydraulic pump-motor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51126486A (en) * 1975-04-25 1976-11-04 Fujitsu Ltd Positioning control system
JPS6083227A (en) * 1983-10-12 1985-05-11 Nippon Gakki Seizo Kk Feed controller of optical disk reproducing device
JPS61251913A (en) * 1985-05-01 1986-11-08 Hitachi Ltd Method and device for positioning carriage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51126486A (en) * 1975-04-25 1976-11-04 Fujitsu Ltd Positioning control system
JPS6083227A (en) * 1983-10-12 1985-05-11 Nippon Gakki Seizo Kk Feed controller of optical disk reproducing device
JPS61251913A (en) * 1985-05-01 1986-11-08 Hitachi Ltd Method and device for positioning carriage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5572919A (en) * 1992-12-22 1996-11-12 Kabushiki Kaisha Komatsu Seisakusho Apparatus for controlling pressure in a cylinder chamber of a hydraulic pump-motor

Also Published As

Publication number Publication date
JP2576132B2 (en) 1997-01-29

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