JPS6482338A - Automatic gain servo-circuit in optical disk device - Google Patents
Automatic gain servo-circuit in optical disk deviceInfo
- 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
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.
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)
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)
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 |
-
1987
- 1987-09-25 JP JP62238663A patent/JP2629201B2/en not_active Expired - Fee Related
Patent Citations (1)
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)
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 |