JPS6482338A - Automatic gain servo-circuit in optical disk device - Google Patents

Automatic gain servo-circuit in optical disk device

Info

Publication number
JPS6482338A
JPS6482338A JP23866387A JP23866387A JPS6482338A JP S6482338 A JPS6482338 A JP S6482338A JP 23866387 A JP23866387 A JP 23866387A JP 23866387 A JP23866387 A JP 23866387A JP S6482338 A JPS6482338 A JP S6482338A
Authority
JP
Japan
Prior art keywords
servo
circuit
switching
gain
optical disk
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
JP23866387A
Other languages
Japanese (ja)
Other versions
JP2629201B2 (en
Inventor
Shigeaki Wachi
Shiro Yamamoto
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP62238663A priority Critical patent/JP2629201B2/en
Publication of JPS6482338A publication Critical patent/JPS6482338A/en
Application granted granted Critical
Publication of JP2629201B2 publication Critical patent/JP2629201B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To simplify a circuit constitution, and also, to prevent a switching noise from being mixed into the signal system of a servo-circuit by adopting a switching control system for an automatic gain servo-circuit. CONSTITUTION:The titled circuit is constituted so that a PWM (Pulse Width Modulation) signal whose pulse width is modulated by the light quantity of a light irradiating to an optical disk is formed, and the amplification gain of servo-circuits 20, 30 is made variable by feedback circuits 14A, 14B which are brought to switching by a pulse duty of this PWM signal. In such a way, the servo-gain can be determined to a correct value without using an expensive AGC amplifier, and also, the generation of a noise caused by a gain control by the switching system, and the deterioration of a servo-characteristic can be eliminated.
JP62238663A 1987-09-25 1987-09-25 Optical disk drive Expired - Fee Related JP2629201B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62238663A JP2629201B2 (en) 1987-09-25 1987-09-25 Optical disk drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62238663A JP2629201B2 (en) 1987-09-25 1987-09-25 Optical disk drive

Publications (2)

Publication Number Publication Date
JPS6482338A true JPS6482338A (en) 1989-03-28
JP2629201B2 JP2629201B2 (en) 1997-07-09

Family

ID=17033476

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62238663A Expired - Fee Related JP2629201B2 (en) 1987-09-25 1987-09-25 Optical disk drive

Country Status (1)

Country Link
JP (1) JP2629201B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7400557B2 (en) 2004-04-05 2008-07-15 Funai Electric Co., Ltd. Optical disk recording and reproducing apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6076032A (en) * 1983-09-30 1985-04-30 Toshiba Corp Focus control circuit of disk record reproducer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6076032A (en) * 1983-09-30 1985-04-30 Toshiba Corp Focus control circuit of disk record reproducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7400557B2 (en) 2004-04-05 2008-07-15 Funai Electric Co., Ltd. Optical disk recording and reproducing apparatus

Also Published As

Publication number Publication date
JP2629201B2 (en) 1997-07-09

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees