JPS6467724A - Focus servo circuit - Google Patents

Focus servo circuit

Info

Publication number
JPS6467724A
JPS6467724A JP22600587A JP22600587A JPS6467724A JP S6467724 A JPS6467724 A JP S6467724A JP 22600587 A JP22600587 A JP 22600587A JP 22600587 A JP22600587 A JP 22600587A JP S6467724 A JPS6467724 A JP S6467724A
Authority
JP
Japan
Prior art keywords
output
signal
disk
digital filter
filter
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
JP22600587A
Other languages
Japanese (ja)
Other versions
JP2595559B2 (en
Inventor
Tomoji Obata
Atsushi Kishi
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP62226005A priority Critical patent/JP2595559B2/en
Publication of JPS6467724A publication Critical patent/JPS6467724A/en
Application granted granted Critical
Publication of JP2595559B2 publication Critical patent/JP2595559B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To obtain a low cost, miniaturization and non-adjustment by processing a signal with digital filter though the signal is conventionally processed with an analog filter. CONSTITUTION:An error signal detecting part 3 to detect disk fluctuating quan tity X1, which is a signal to show the dislocation of an optical disk from a reference position, and fluctuating quantity DELTAX between a disk and a lens, which is the difference of optical system following quantity to be a control signal to move an objective lens, and to output an error output to correspond to the detected fluctuating quantity DELTAX between the disk and the lens, an A/D converter 4 to A/D converter the error output, a digital filter 5 to filter the output of the A/D converter 4, and a control circuit 6 to output the optical system following quantity based on the output of the digital filter, are provided. Thus, since the digital filter is used instead of the conventional analog filter, the capacitor of large capacity is not needed and an integrating circuit can be easily obtained. Then, the miniaturization and the non-adjustment can be obtained.
JP62226005A 1987-09-08 1987-09-08 Focus servo circuit Expired - Lifetime JP2595559B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62226005A JP2595559B2 (en) 1987-09-08 1987-09-08 Focus servo circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62226005A JP2595559B2 (en) 1987-09-08 1987-09-08 Focus servo circuit

Publications (2)

Publication Number Publication Date
JPS6467724A true JPS6467724A (en) 1989-03-14
JP2595559B2 JP2595559B2 (en) 1997-04-02

Family

ID=16838294

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62226005A Expired - Lifetime JP2595559B2 (en) 1987-09-08 1987-09-08 Focus servo circuit

Country Status (1)

Country Link
JP (1) JP2595559B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6015872A (en) * 1983-06-30 1985-01-26 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Track following servo device
JPS6344384A (en) * 1986-08-12 1988-02-25 Toshiba Corp Servo circuit for disk reproducing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6015872A (en) * 1983-06-30 1985-01-26 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Track following servo device
JPS6344384A (en) * 1986-08-12 1988-02-25 Toshiba Corp Servo circuit for disk reproducing device

Also Published As

Publication number Publication date
JP2595559B2 (en) 1997-04-02

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