JPS6478439A - Optical information recording and reproducing device - Google Patents

Optical information recording and reproducing device

Info

Publication number
JPS6478439A
JPS6478439A JP23494387A JP23494387A JPS6478439A JP S6478439 A JPS6478439 A JP S6478439A JP 23494387 A JP23494387 A JP 23494387A JP 23494387 A JP23494387 A JP 23494387A JP S6478439 A JPS6478439 A JP S6478439A
Authority
JP
Japan
Prior art keywords
servo
focusing
lead
leading
overshoot
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
JP23494387A
Other languages
Japanese (ja)
Inventor
Satoshi Shikichi
Shigeto Kanda
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP23494387A priority Critical patent/JPS6478439A/en
Publication of JPS6478439A publication Critical patent/JPS6478439A/en
Pending legal-status Critical Current

Links

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To make an overshoot after leading in a servo small and to stably execute a servo lead-in by operating a positional servo after making the relative moving speed of an optical beam spot and a recording medium small when leading in a focusing servo, etc. CONSTITUTION:In a focusing control circuit, a chopping wave generating circuit 306, etc., to be able to stop the change of a chopping wave C by a signal E from a focusing controller 305 are provided. At the time of detecting a servo lead-in position in the lead-in action of a tracking servo and/or focusing servo, the condition of the moving means of the optical beam spot is fixed and at a fixed time, the loop of the tracking servo and/or focusing servo is closed. Thus, the overshoot after leading in the servo can be made about zero and the servo lead-in can be stably executed.
JP23494387A 1987-09-21 1987-09-21 Optical information recording and reproducing device Pending JPS6478439A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23494387A JPS6478439A (en) 1987-09-21 1987-09-21 Optical information recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23494387A JPS6478439A (en) 1987-09-21 1987-09-21 Optical information recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS6478439A true JPS6478439A (en) 1989-03-23

Family

ID=16978698

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23494387A Pending JPS6478439A (en) 1987-09-21 1987-09-21 Optical information recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS6478439A (en)

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