JPS6459634A - Optical information recording and reproducing device - Google Patents

Optical information recording and reproducing device

Info

Publication number
JPS6459634A
JPS6459634A JP21544387A JP21544387A JPS6459634A JP S6459634 A JPS6459634 A JP S6459634A JP 21544387 A JP21544387 A JP 21544387A JP 21544387 A JP21544387 A JP 21544387A JP S6459634 A JPS6459634 A JP S6459634A
Authority
JP
Japan
Prior art keywords
signal
servo
lens
reproducing device
moving
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
JP21544387A
Other languages
Japanese (ja)
Other versions
JPH0682468B2 (en
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 JP21544387A priority Critical patent/JPH0682468B2/en
Publication of JPS6459634A publication Critical patent/JPS6459634A/en
Publication of JPH0682468B2 publication Critical patent/JPH0682468B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To obtain a recording and reproducing device operated stably with a low-cost by detecting a servo lock position roughly and then moving a spot at a lower speed than that at the detection so as to detect the servo lock position thereby closing the servo. CONSTITUTION:In giving a signal K to a phase compensation circuit 203 by a signal H, the lens position servo including a sensor 209 in the loop is applied, signal J, F are outputted from a processor 212 via DA converters 207, 211 to move the lens to the focusing position. At first the signal J is varied with constant signal F to detect roughly the focusing position. Then the signal F is varied with a constant signal J. In this case, since the moving quantity of the lens and the moving speed are selected sufficiently smaller than those in changing the signal J, the focal position is detected minutely to lock the automatic focusing servo. Through the constitution above, the moments of the lens is small, overshoot becomes smaller and the device is operated stably.
JP21544387A 1987-08-31 1987-08-31 Optical information recording / reproducing device Expired - Lifetime JPH0682468B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21544387A JPH0682468B2 (en) 1987-08-31 1987-08-31 Optical information recording / reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21544387A JPH0682468B2 (en) 1987-08-31 1987-08-31 Optical information recording / reproducing device

Publications (2)

Publication Number Publication Date
JPS6459634A true JPS6459634A (en) 1989-03-07
JPH0682468B2 JPH0682468B2 (en) 1994-10-19

Family

ID=16672439

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21544387A Expired - Lifetime JPH0682468B2 (en) 1987-08-31 1987-08-31 Optical information recording / reproducing device

Country Status (1)

Country Link
JP (1) JPH0682468B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001304844A (en) * 2000-03-17 2001-10-31 Helmut Fischer Gmbh & Co Inst Fuer Elektronik & Messtechnik Method of setting measurement target position in layer thickness measurement by X-ray fluorescence

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001304844A (en) * 2000-03-17 2001-10-31 Helmut Fischer Gmbh & Co Inst Fuer Elektronik & Messtechnik Method of setting measurement target position in layer thickness measurement by X-ray fluorescence

Also Published As

Publication number Publication date
JPH0682468B2 (en) 1994-10-19

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