KR950006835A - Disc damage prevention circuit by optical pickup objective lens - Google Patents

Disc damage prevention circuit by optical pickup objective lens Download PDF

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Publication number
KR950006835A
KR950006835A KR1019930017135A KR930017135A KR950006835A KR 950006835 A KR950006835 A KR 950006835A KR 1019930017135 A KR1019930017135 A KR 1019930017135A KR 930017135 A KR930017135 A KR 930017135A KR 950006835 A KR950006835 A KR 950006835A
Authority
KR
South Korea
Prior art keywords
terminal
reference level
optical pickup
vref
objective lens
Prior art date
Application number
KR1019930017135A
Other languages
Korean (ko)
Other versions
KR950007292B1 (en
Inventor
김군진
Original Assignee
배순훈
대우전자 주식회사
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Priority to KR1019930017135A priority Critical patent/KR950007292B1/en
Publication of KR950006835A publication Critical patent/KR950006835A/en
Application granted granted Critical
Publication of KR950007292B1 publication Critical patent/KR950007292B1/en

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    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • G11B7/131—Arrangement of detectors in a multiple array
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/12—Disposition of constructional parts in the apparatus, e.g. of power supply, of modules
    • G11B33/121—Disposition of constructional parts in the apparatus, e.g. of power supply, of modules the apparatus comprising a single recording/reproducing device
    • G11B33/122—Arrangements for providing electrical connections, e.g. connectors, cables, switches
    • 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
    • G11B7/0908—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 for focusing only
    • G11B7/0912—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 for focusing only by push-pull method

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

본 발명은 광픽업 대물렌즈에 의한 디스크손상방지회로에 관한 것으로, 광픽업 대물렌즈에 의한 디스크상의 데이터를 독출 및 기록하는 장치에 있어서, 랜덤하게 인가되는 충격이나 온도 등에 의해 변화되는 서보 시정수의 변화에 의해 광픽업 대물렌즈가 디스크와 충돌하여 방생하는 디스크의 손상을 방지하기 위한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk damage prevention circuit by an optical pickup objective lens. The present invention relates to a device for reading and recording data on a disk by an optical pickup objective lens. The optical pickup objective lens is prevented from being damaged by the collision due to the collision with the disc.

이를 위해 본 발명은, 공통단자(c)가 상기 비교수단(50)의 출력단자에 접속되고 제1단자(a)가 상기 증폭기(OP2)의 한쪽 입력단자에 접속되며 제2단자(b)가 소정의 접지전압에 접속된 스위치(SW)와; 한쪽 입력단자가 상기 가산수단(30)의 출력단자에 접속되고 다른쪽 입력단자가 기준레벨발생수단(Vref)에 접속되어, 상기 가산수단(30)에 의해 가산된 전기적인 신호레벨이 상기 기준레벨발생수단(Vref)에 의해 발생된 기준레벨을 초과하지 않을 경우에는 상기 스위치(SW)의 공통단자(c)가 제1단자(a)에 연결된 상태를 유지하도록 하는 한편, 상기 가산수단(30)에 의해 가산된 전기적인 신호레벨이 상기 기준레벨발생수단(Vref)에 의해 소정의 기준레벨을 초과할 경우에는 상기 스위칭(SW)의 공통단자(c)가 제2단자(b)로 연결되도록 상기 스위치(SW)를 제어하는 스위칭제어수단(100)으로 이루어진 것이다.To this end, in the present invention, the common terminal (c) is connected to the output terminal of the comparison means 50, the first terminal (a) is connected to one input terminal of the amplifier (OP2) and the second terminal (b) A switch SW connected to a predetermined ground voltage; One input terminal is connected to the output terminal of the adding means 30 and the other input terminal is connected to the reference level generating means Vref, so that the electrical signal level added by the adding means 30 is the reference level. When the reference level generated by the generating means Vref is not exceeded, the common terminal c of the switch SW is kept connected to the first terminal a, while the adding means 30 When the electrical signal level added by the reference level generating means (Vref) exceeds a predetermined reference level, the common terminal (c) of the switching (SW) is connected to the second terminal (b) It consists of a switching control means 100 for controlling the switch (SW).

Description

광픽업 대물렌즈에 의한 디스크손상 방지회로Disc damage prevention circuit by optical pickup objective lens

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

제1도는 본 발명에 따른 광픽업 대물렌즈에 의한 디스크손상방지회로를 나타낸 도면.1 is a diagram showing a disk damage prevention circuit by the optical pickup objective lens according to the present invention.

Claims (2)

광픽업에 의해 검출된 디스크로부터의 반사광을 수광하여 전기적인 신호로 변환하는 4개의 광전변환소자(A, B, C, D)로 이루어진 광전변환수단(10)과, 상기 각 광전변환소자(A, B, C, D)에 의해 수광된 광량에 대응하는 전기적인 신호를 가산하는 가산수단(30), 상기 각 광전변환소자(A, B, C, D)에 의해 수광된 광량에 의해 상기 광픽업의 포커스 에러를 검출하는 포커스 에러검출수단(20) 및, 상기 포커스에러검출수단(20)에서 검출된 포커스에러신호를 소정의 기준신호와 비교하는 비교수단(50) 및, 증폭기(OP2)와 포커스 코일(CF)을 갖추고서 상기 비교수단(50)의 출력신호를 소정의 기준신호와 비교하여 그 비교결과에 따라 상기 광픽업과 상기 디스크와의 간격을 조절하여 포커스를 맞추는 포커스조절수단(70)을 구비한 광픽업 대물렌즈에 의한 디스크상의 데이터를 독출 및 기록하는 장치에 있어서, 공통단자(c)가 상기 비교수단(50)의 출력단자에 접속되고 제1단자(a)가 상기 증폭기(OP2)의 한쪽 입력단자에 접속되며 제2단자(b)가 소정의 접지전압에 접속된 스위칭(SW)와; 한쪽 입력단자가 상기 가산수단(30)의 출력단자에 접속되고 다른쪽 입력단자가 기준레벨발생수단(Vref)에 접속되어, 상기 가산수단(30)에 의해 가산된 전기적인 신호레벨이 상기 기준레벨발생수단(Vref)에 의해 발생된 기준레벨을 초과하지 않을 경우에는 상기 스위치(SW)의 공통단자(c)가 제2단자(a)에 연결된 상태를 유지하도록 하는 한편, 상기 가산수단(30)에 의해 가산된 전기적인 신호레벨이 상기 기준레벨발생수단(Vref)에 의해 소정의 기준레벨을 초과할 경우에는 상기 스위치(SW)의 공통단자(c)가 제2단자(b)로 연결되도록 상기 스위치(SW)를 제어하는 스위칭제어수단(100)으로 이루어진 것을 특징으로 하는 광픽업 대물렌즈에 의한 디스크손상 방지회로.Photoelectric conversion means (10) comprising four photoelectric conversion elements (A, B, C, D) for receiving the reflected light from the disk detected by the optical pickup and converting the light into an electrical signal; By the addition means 30 for adding an electric signal corresponding to the light amount received by the light sources B, C, and D, and the light amount received by the photoelectric conversion elements A, B, C, and D. A focus error detecting means 20 for detecting a focus error of the pickup, a comparing means 50 for comparing the focus error signal detected by the focus error detecting means with a predetermined reference signal, and an amplifier OP2; Focus adjusting means having a focus coil (C F ) to compare the output signal of the comparison means 50 with a predetermined reference signal and to adjust the focus by adjusting the distance between the optical pickup and the disk according to the comparison result ( On-disk data by optical pickup objective with 70) In the apparatus for reading and recording, the common terminal c is connected to the output terminal of the comparing means 50, the first terminal a is connected to one input terminal of the amplifier OP2, and the second terminal b is connected. Switching SW connected to a predetermined ground voltage; One input terminal is connected to the output terminal of the adding means 30 and the other input terminal is connected to the reference level generating means Vref, so that the electrical signal level added by the adding means 30 is the reference level. When the reference level generated by the generating means Vref is not exceeded, the common terminal c of the switch SW is kept connected to the second terminal a, while the adding means 30 When the electrical signal level added by the reference level generating means (Vref) exceeds a predetermined reference level, the common terminal (c) of the switch (SW) is connected to the second terminal (b) Disc damage prevention circuit by the optical pickup objective lens, characterized in that consisting of a switching control means for controlling the switch (SW). 제1항에 있어서, 상기 기준레벨발생수단(Vref)에 의해 발생된 기준레벨은 상기 픽업과 상기 디스크 사이의 간격이 적어도 1.9㎜ 미만일 경우에 상기 광전변환수단(10)에 의해 수광되어 상기 가산수단(30)에 의해 가산된 전기적인 신호레벨에 대응하는 것을 특징으로 하는 광픽업 대물렌즈에 의한 디스크손상 방지회로.A reference level generated by the reference level generating means (Vref) is received by the photoelectric conversion means (10) when the distance between the pickup and the disk is at least less than 1.9 mm, and the adding means. A disk damage prevention circuit by an optical pickup objective lens, characterized in that it corresponds to an electrical signal level added by (30). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930017135A 1993-08-31 1993-08-31 Disk brack off protecter circuit of optical pick up lens KR950007292B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930017135A KR950007292B1 (en) 1993-08-31 1993-08-31 Disk brack off protecter circuit of optical pick up lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930017135A KR950007292B1 (en) 1993-08-31 1993-08-31 Disk brack off protecter circuit of optical pick up lens

Publications (2)

Publication Number Publication Date
KR950006835A true KR950006835A (en) 1995-03-21
KR950007292B1 KR950007292B1 (en) 1995-07-07

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KR1019930017135A KR950007292B1 (en) 1993-08-31 1993-08-31 Disk brack off protecter circuit of optical pick up lens

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KR950007292B1 (en) 1995-07-07

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