JPS6466830A - Servo system for optical disk recording/reproducing device - Google Patents

Servo system for optical disk recording/reproducing device

Info

Publication number
JPS6466830A
JPS6466830A JP62223469A JP22346987A JPS6466830A JP S6466830 A JPS6466830 A JP S6466830A JP 62223469 A JP62223469 A JP 62223469A JP 22346987 A JP22346987 A JP 22346987A JP S6466830 A JPS6466830 A JP S6466830A
Authority
JP
Japan
Prior art keywords
signal
optical disk
switches
reproducing device
recording
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
JP62223469A
Other languages
Japanese (ja)
Other versions
JPH0775083B2 (en
Inventor
Kazuhiro Aoki
Toshiyuki Shimada
Noboru Kikuchi
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 JP22346987A priority Critical patent/JPH0775083B2/en
Publication of JPS6466830A publication Critical patent/JPS6466830A/en
Publication of JPH0775083B2 publication Critical patent/JPH0775083B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To facilitate to reduce the scale of a circuit without putting a focus error signal into disorder by switching the reproduction level of a preamplifier when a device is switched from a reproduction mode into recording and erasure modes. CONSTITUTION:When the signal of an optical disk is reproduced, switches 7, 8 are operated so as to turn OFF, and when the signal is recorded or erased on or from the optical disk, the switches 7, 8 are operated so as to turn ON. Thus, a current-voltage conversion load resistance of each preamplifier 21, 22 is divided into two lines shown by 3, 4; 5, 6 respectively, and the switches 7, 8 are provided in parallel with one of them, i.e., 4, 6, and the current-voltage conversion load resistance is changed by turning them off at the time of reproducing a signal, and turning them on at the time of recording and erasing the signal. Thus, the focus error signal comes not to be put into the disorder, and in addition, a variable gain circuit comes to be unnecessary.
JP22346987A 1987-09-07 1987-09-07 Servo device of optical disk recording / reproducing device Expired - Lifetime JPH0775083B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22346987A JPH0775083B2 (en) 1987-09-07 1987-09-07 Servo device of optical disk recording / reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22346987A JPH0775083B2 (en) 1987-09-07 1987-09-07 Servo device of optical disk recording / reproducing device

Publications (2)

Publication Number Publication Date
JPS6466830A true JPS6466830A (en) 1989-03-13
JPH0775083B2 JPH0775083B2 (en) 1995-08-09

Family

ID=16798626

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22346987A Expired - Lifetime JPH0775083B2 (en) 1987-09-07 1987-09-07 Servo device of optical disk recording / reproducing device

Country Status (1)

Country Link
JP (1) JPH0775083B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7133346B2 (en) 2001-12-14 2006-11-07 Sharp Kabushiki Kaisha Photo-detector amplifier circuit for optical disk device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7133346B2 (en) 2001-12-14 2006-11-07 Sharp Kabushiki Kaisha Photo-detector amplifier circuit for optical disk device
US7263046B2 (en) 2001-12-14 2007-08-28 Sharp Kabushiki Kaisha Photo-detector amplifier circuit for optical disk device

Also Published As

Publication number Publication date
JPH0775083B2 (en) 1995-08-09

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