KR950004122A - Light output automatic control circuit - Google Patents

Light output automatic control circuit Download PDF

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Publication number
KR950004122A
KR950004122A KR1019930014149A KR930014149A KR950004122A KR 950004122 A KR950004122 A KR 950004122A KR 1019930014149 A KR1019930014149 A KR 1019930014149A KR 930014149 A KR930014149 A KR 930014149A KR 950004122 A KR950004122 A KR 950004122A
Authority
KR
South Korea
Prior art keywords
light
transistor
output
light emitting
control circuit
Prior art date
Application number
KR1019930014149A
Other languages
Korean (ko)
Other versions
KR950013390B1 (en
Inventor
김연옥
Original Assignee
배순훈
대우전자 주식회사
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 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019930014149A priority Critical patent/KR950013390B1/en
Publication of KR950004122A publication Critical patent/KR950004122A/en
Application granted granted Critical
Publication of KR950013390B1 publication Critical patent/KR950013390B1/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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Head (AREA)

Abstract

본 발명은 광출력 자동제어호로에 관한 것으로, 입력전압에 대해 바이어스저항(R20)에 의해 베이스바이어스가 설정되어 발광소자(LD20)를 구동하는 제 1 트랜지스터(Q20)와, 상기 발광소자(LD20)로부터의 광비임의 반사광을 수광하는 수광소자(PT)에 일단 (+)이 접속되고 다른 단(-)에 설정된 기준전압에 의해 수광소자(PT20)의 출력을 비교하는 비교수단(A20), 이 비교수단(A20)의 출력에 의해 베이스바이어스가 형성되어 상기 제 1 트랜지스터(Q20)의 베이스구동전류를 제어하는 제 2 트랜지스터(Q22)로 구성되어 제 1 트랜지스터(Q20)의 베이스구동전류의 제어에 따라 발광소자(LD20)의 광출력을 가감제어하도록 하는 것이다.The present invention relates to an automatic light output control circuit, comprising: a first transistor (Q20) for driving a light emitting device (LD20) with a base bias set by a bias resistor (R20) with respect to an input voltage, and the light emitting device (LD20). A comparison means A20 for comparing the output of the light receiving element PT20 by a reference voltage set once with a positive voltage connected to the light receiving element PT for receiving the reflected light of the light beam from the other end (-), the comparison A base bias is formed by the output of the means A20, and is composed of a second transistor Q22 for controlling the base drive current of the first transistor Q20, according to the control of the base drive current of the first transistor Q20. The light output of the light emitting element LD20 is controlled.

Description

광출력 자동제어회로Light output automatic control circuit

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

제 2 도는 본 발명에 따른 광출력 자동제어회로를 나타낸 회로도이다.2 is a circuit diagram showing a light output automatic control circuit according to the present invention.

Claims (1)

입력전압에 대해 바이어스저항에 의해 베이스바이어스가 설정되어 발광소자를 구동하는 제 1 트랜지스터와, 상기 발광소자로부터의 광비임의 반사광을 수광하는 수광소자에 일단이 접속되고 다른 단에 설정된 기준전압에 의해 수광소자의 출력을 비교하는 비교수단, 이 비교수단의 출력에 의해 베이스바이어스가 형성되어 상기 제 1 트랜지스터의 베이스구동전류를 제어하여 상기 발광소자의 광출력레벨이 제어되도록 하는 제 2 트랜지스터로 구성된 것을 특징으로 하는 광출력 자동제어회로.The base bias is set by the bias resistor with respect to the input voltage, and the first transistor for driving the light emitting element and the light receiving element for receiving the reflected light of the light beam from the light emitting element are connected to one end and received by the reference voltage set at the other end. Comparing means for comparing the output of the device, the output of the comparison means is formed with a second transistor to control the base driving current of the first transistor to control the light output level of the light emitting device Light output automatic control circuit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930014149A 1993-07-26 1993-07-26 Auto control circuit of optical power KR950013390B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930014149A KR950013390B1 (en) 1993-07-26 1993-07-26 Auto control circuit of optical power

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930014149A KR950013390B1 (en) 1993-07-26 1993-07-26 Auto control circuit of optical power

Publications (2)

Publication Number Publication Date
KR950004122A true KR950004122A (en) 1995-02-17
KR950013390B1 KR950013390B1 (en) 1995-11-08

Family

ID=19359996

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930014149A KR950013390B1 (en) 1993-07-26 1993-07-26 Auto control circuit of optical power

Country Status (1)

Country Link
KR (1) KR950013390B1 (en)

Also Published As

Publication number Publication date
KR950013390B1 (en) 1995-11-08

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