JPS5778643A - Disk reproducer - Google Patents

Disk reproducer

Info

Publication number
JPS5778643A
JPS5778643A JP15341680A JP15341680A JPS5778643A JP S5778643 A JPS5778643 A JP S5778643A JP 15341680 A JP15341680 A JP 15341680A JP 15341680 A JP15341680 A JP 15341680A JP S5778643 A JPS5778643 A JP S5778643A
Authority
JP
Japan
Prior art keywords
focus error
error signal
objective lens
signal
gain
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
JP15341680A
Other languages
Japanese (ja)
Inventor
Tsuneo Hirose
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP15341680A priority Critical patent/JPS5778643A/en
Publication of JPS5778643A publication Critical patent/JPS5778643A/en
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To prevent the influence caused by reflected rays of a disk and variation of a light source, by constituting so that the loop gain of a focus control system is made variable in accordance with the magnitude of a focus error signal. CONSTITUTION:A focus error signal generated from a focus error signal extracting part 1 is amplified by a focus error signal amplifying part 3', and after that, is inputted to an objective lens driving part 4. A signal of several tens of kHz generated from an objective lens forced driving signal generating part 31 is supplied in advance to the objective lens driving part 4, a signal by forced vibration of the objective lens is obtained from the focus error signal extracting part 1, and the gain of the focus error signal amplifying part 3' is controlled by an optical system gain automatic compensating part 32. This constitution is applicable to a tracking error control system in the same way.
JP15341680A 1980-10-31 1980-10-31 Disk reproducer Pending JPS5778643A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15341680A JPS5778643A (en) 1980-10-31 1980-10-31 Disk reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15341680A JPS5778643A (en) 1980-10-31 1980-10-31 Disk reproducer

Publications (1)

Publication Number Publication Date
JPS5778643A true JPS5778643A (en) 1982-05-17

Family

ID=15562013

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15341680A Pending JPS5778643A (en) 1980-10-31 1980-10-31 Disk reproducer

Country Status (1)

Country Link
JP (1) JPS5778643A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0521332U (en) * 1991-05-20 1993-03-19 株式会社ケンウツド Optical disk player

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0521332U (en) * 1991-05-20 1993-03-19 株式会社ケンウツド Optical disk player

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