JPS6430030A - Optical disk device - Google Patents

Optical disk device

Info

Publication number
JPS6430030A
JPS6430030A JP18512287A JP18512287A JPS6430030A JP S6430030 A JPS6430030 A JP S6430030A JP 18512287 A JP18512287 A JP 18512287A JP 18512287 A JP18512287 A JP 18512287A JP S6430030 A JPS6430030 A JP S6430030A
Authority
JP
Japan
Prior art keywords
fes
output
optical disk
envelope
disk device
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
JP18512287A
Other languages
Japanese (ja)
Inventor
Shigetomo Yanagi
Akira Minami
Shigeyoshi Tanaka
Masateru Sasaki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP18512287A priority Critical patent/JPS6430030A/en
Publication of JPS6430030A publication Critical patent/JPS6430030A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To prevent the generation of an offset in a focus error signal (FES) in both the unrecording part and recording part of an optical disk by adding an output of an RF envelope detecting circuit to an output of a division type optical detector as a correcting variable to form an FES. CONSTITUTION:An optical disk device has the RF envelope detecting circuit 2 for detecting an envelope of a reproduced output (RF signal) of a recording signal and the FES computing circuit 3 for adding the output of the RF envelope detecting circuit 2 to the output of the division type optical detector 1 as a correcting value to form an FES. Consequently, an FES computing circuit 3 for preventing the generation of an offset in an FES in both the unrecording part and recording part of an optical disk.
JP18512287A 1987-07-24 1987-07-24 Optical disk device Pending JPS6430030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18512287A JPS6430030A (en) 1987-07-24 1987-07-24 Optical disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18512287A JPS6430030A (en) 1987-07-24 1987-07-24 Optical disk device

Publications (1)

Publication Number Publication Date
JPS6430030A true JPS6430030A (en) 1989-01-31

Family

ID=16165252

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18512287A Pending JPS6430030A (en) 1987-07-24 1987-07-24 Optical disk device

Country Status (1)

Country Link
JP (1) JPS6430030A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0224842A (en) * 1988-07-14 1990-01-26 Aiwa Co Ltd Optical head device
JPH054317U (en) * 1991-06-28 1993-01-22 株式会社ケンウツド Write-once optical disk recording / reproducing device
WO2006088050A1 (en) * 2005-02-16 2006-08-24 Matsushita Electric Industrial Co., Ltd. Optical disk unit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59201233A (en) * 1983-04-27 1984-11-14 Toshiba Corp Focus control circuit of optical disk record reproducing device
JPS61182638A (en) * 1985-02-08 1986-08-15 Hitachi Ltd Focus servo circuit of optical recording and reproducing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59201233A (en) * 1983-04-27 1984-11-14 Toshiba Corp Focus control circuit of optical disk record reproducing device
JPS61182638A (en) * 1985-02-08 1986-08-15 Hitachi Ltd Focus servo circuit of optical recording and reproducing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0224842A (en) * 1988-07-14 1990-01-26 Aiwa Co Ltd Optical head device
JPH054317U (en) * 1991-06-28 1993-01-22 株式会社ケンウツド Write-once optical disk recording / reproducing device
WO2006088050A1 (en) * 2005-02-16 2006-08-24 Matsushita Electric Industrial Co., Ltd. Optical disk unit

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