KR900002257A - Focus servo circuit - Google Patents

Focus servo circuit Download PDF

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Publication number
KR900002257A
KR900002257A KR1019890010209A KR890010209A KR900002257A KR 900002257 A KR900002257 A KR 900002257A KR 1019890010209 A KR1019890010209 A KR 1019890010209A KR 890010209 A KR890010209 A KR 890010209A KR 900002257 A KR900002257 A KR 900002257A
Authority
KR
South Korea
Prior art keywords
focus servo
servo circuit
low pass
pass filter
compensating
Prior art date
Application number
KR1019890010209A
Other languages
Korean (ko)
Inventor
히로마사 기무라
Original Assignee
오오가 노리오
소니 가부시끼 가이샤
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 오오가 노리오, 소니 가부시끼 가이샤 filed Critical 오오가 노리오
Publication of KR900002257A publication Critical patent/KR900002257A/en
Priority to KR2019980003672U priority Critical patent/KR200141486Y1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following

Landscapes

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

Abstract

내용 없음No content

Description

포커스 서어보 회로Focus servo circuit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도 및 제2도는 본 발명 포커스 서어보 회로의 제 1의 실시예를 도시하고 있으며 제1도는 회로도면.1 and 2 show a first embodiment of the focus servo circuit of the present invention and FIG. 1 is a circuit diagram.

제2도는 게인의 주파수 특성을 종래의 포커스 서어보회로의 특성과를 대비시켜서 개략적으로 도시하는 특성도면.2 is a characteristic diagram schematically showing a frequency characteristic of a gain in contrast with that of a conventional focus servo circuit.

제3도는 본 발명 포커스 서어보 회로의 제 2 의 실시예를 도시하는 회로 도면3 is a circuit diagram showing a second embodiment of the focus servo circuit of the present invention;

Claims (1)

서어보계의 위상 특성상의 보상을 행하는 위상 보상 수단과, 광학 픽업 장치의 2차 공진 주파수 이하의 차단주파수를 갖는 저역 통과 필터 수단을 갖춘 포커스 서어보회로에 있어서, 상기 저역 통과 필터 수단을 3차의 액티브필터로 형성한 것을 특징으로 하는 포커스 서어보 회로.A focus servo circuit comprising a phase compensating means for compensating for the phase characteristic of a servo system and a low pass filter means having a cutoff frequency less than or equal to the secondary resonance frequency of the optical pickup device, wherein the low pass filter means A focus servo circuit comprising an active filter. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019890010209A 1988-07-22 1989-07-19 Focus servo circuit KR900002257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019980003672U KR200141486Y1 (en) 1988-07-22 1998-03-13 Focus servo circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63183302A JPH0233733A (en) 1988-07-22 1988-07-22 Focus servo circuit
JP183302 1988-07-22

Related Child Applications (1)

Application Number Title Priority Date Filing Date
KR2019980003672U Division KR200141486Y1 (en) 1988-07-22 1998-03-13 Focus servo circuit

Publications (1)

Publication Number Publication Date
KR900002257A true KR900002257A (en) 1990-02-28

Family

ID=16133297

Family Applications (2)

Application Number Title Priority Date Filing Date
KR1019890010209A KR900002257A (en) 1988-07-22 1989-07-19 Focus servo circuit
KR2019980003672U KR200141486Y1 (en) 1988-07-22 1998-03-13 Focus servo circuit

Family Applications After (1)

Application Number Title Priority Date Filing Date
KR2019980003672U KR200141486Y1 (en) 1988-07-22 1998-03-13 Focus servo circuit

Country Status (2)

Country Link
JP (1) JPH0233733A (en)
KR (2) KR900002257A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4017487A1 (en) * 1990-05-31 1991-12-05 Thomson Brandt Gmbh SERVO CONTROL CIRCUIT
US5646639A (en) * 1994-06-13 1997-07-08 Nippondenso Co., Ltd. Display device for vehicles

Also Published As

Publication number Publication date
JPH0233733A (en) 1990-02-02
KR200141486Y1 (en) 1999-04-15

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Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application
WICV Withdrawal of application forming a basis of a converted application