KR830006708A - Focus detection method and device - Google Patents

Focus detection method and device Download PDF

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Publication number
KR830006708A
KR830006708A KR1019810003017A KR810003017A KR830006708A KR 830006708 A KR830006708 A KR 830006708A KR 1019810003017 A KR1019810003017 A KR 1019810003017A KR 810003017 A KR810003017 A KR 810003017A KR 830006708 A KR830006708 A KR 830006708A
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KR
South Korea
Prior art keywords
light
reflected
objective lens
incident
optical
Prior art date
Application number
KR1019810003017A
Other languages
Korean (ko)
Inventor
기요조 고시이시
아사오 하야시
겡이찌 오오이노우에
마사도시 이다
Original Assignee
기다무라 시게오
오림파스 고오가꾸 고오교 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 기다무라 시게오, 오림파스 고오가꾸 고오교 가부시끼 가이샤 filed Critical 기다무라 시게오
Publication of KR830006708A publication Critical patent/KR830006708A/en
Priority to KR2019850001878U priority Critical patent/KR850000649Y1/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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

내용 없음No content

Description

초점검출방법 및 장치Focus detection method and device

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

제2도는 본 발명에 의한 초점검출방법을 실시하는 광학적 판독장치의 요부의 일예의 구성을 나타내는 선도.2 is a diagram showing a configuration of an example of a main portion of an optical reading apparatus for performing a focus detection method according to the present invention.

제3도는 임계 각 근방에서의 반사강도의 일예를 나타내는 신도.3 is an elongation showing an example of reflection intensity near a critical angle.

제4도는 본 발명에 의한 초점검출 방법을 실시하는 광학적 판독장치의 1예의 요부의 구성을 나타내는 선도.4 is a diagram showing the constitution of main parts of an example of an optical reading apparatus for performing a focus detection method according to the present invention.

제5도 및 제6도는 본 발명에 의한 초점검출방법을 실시하는 광학적 판독장치의 동작을 설명하기 위한 신호파형도.5 and 6 are signal waveform diagrams for explaining the operation of the optical reading apparatus for implementing the focus detection method according to the present invention.

Claims (5)

광원으로부터 사출된 광을 대물렌즈에 의해 피조사물체상에 집속시키고, 그 반사광의 1부를, 그 반사광속에 대해 각각 거의 임계각이 되게 설정한 반사면을 갖는 2개이상의 광학부재에 입사시켜 이들 광학부재의 반사면에서 반사된 반사광 또는 반사면에서 굴절된 투과광의 광량분포의 변화를 검출함으로써 상기 대물렌즈의 상기 피조사물체에 대한 굴절오차신호를 얻을 수 있는 것을 특징으로 하는 초점검출방법.The light emitted from the light source is focused on the object to be irradiated by the objective lens, and one part of the reflected light is incident on two or more optical members having reflecting surfaces set to be substantially at a critical angle with respect to the reflected light flux, respectively. And a refractive error signal for the irradiated object of the objective lens can be obtained by detecting a change in the light quantity distribution of the reflected light reflected from the reflective surface or the transmitted light refracted from the reflective surface. 상기 피조사물체를 정보트랙을 갖는 광학식 디스크로 하여, 광학부재에 입사하지 않는 반사광의 광량변화를 검출함으로써 정보신호를 얻는 것을 특징으로 하는 특허청구의 범위 1항 기재의 초점검출방법.The focus detection method according to claim 1, wherein the object to be irradiated is an optical disk having an information track, and an information signal is obtained by detecting a change in the amount of reflected light not incident on the optical member. 상기 광원으로 부터의 광범을 편광된 광범으로 하여, 상기 광학부재에 입사하는 광범을 P편광으로 하는 것을 특징으로 하는 특허청구의 범위 1항 기재의 초점검출방법.A focus detection method according to claim 1, wherein the broad range from the light source is a polarized broad range, and the wide range incident to the optical member is P polarized light. 상기 광학부재의 반사면에서의 반사회수는 복수회로 하는 것을 특징으로 하는 특허청구의 범위 1항 기재의 초점검출방법.The focus detection method according to claim 1, wherein the number of reflections on the reflecting surface of the optical member is plural. 광원으로부터 반사된 광을 집속시켜 피조사물체에 조사하는 대물렌즈와, 그 대물렌즈와 상기 광원과의 사이에 배치하여, 상기 광원으로 부터의 광을 상기 대물렌즈에 유도하는 광분할소자와, 상기 대물렌즈와 광검기와의 사이에서 상기 반사광의 일부의 광속을 입사하게 배치하고, 그 반사광속중의 2개이상의 상이한 광선에 대하여 각각 거의 임계각이 되게 설정한 반사면을 갖는 2개이상의 검출광학소자를 구비하고 그 검출광학소자의 반사면에서 반사된 반사광 또는 반사면에서 굴절된 투과광의 광량분포의 변화는 상기 광검출기에 의해 검출함으로써 초점오차신호를 얻는 것을 특징으로 하는 초점검출장치.An objective lens for focusing the light reflected from the light source and irradiating the object to be irradiated, a light splitting element arranged between the objective lens and the light source to guide light from the light source to the objective lens; Two or more detection optical elements each having a reflecting surface disposed between the objective lens and the photodetector so that a part of the light beam of the reflected light is incident thereon, and set to be substantially at a critical angle with respect to two or more different light beams of the reflected light beam; And a change in the light quantity distribution of the reflected light reflected from the reflecting surface of the detecting optical element or the transmitted light refracted from the reflecting optical element is detected by the photodetector to obtain a focus error signal. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019810003017A 1980-08-19 1981-08-19 Focus detection method and device KR830006708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019850001878U KR850000649Y1 (en) 1980-08-19 1985-02-25 Forcus detecting device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11445880A JPS5738404A (en) 1980-08-19 1980-08-19 Method and device for detection of focal point
JP55-114458 1980-08-19

Related Child Applications (1)

Application Number Title Priority Date Filing Date
KR2019850001878U Division KR850000649Y1 (en) 1980-08-19 1985-02-25 Forcus detecting device

Publications (1)

Publication Number Publication Date
KR830006708A true KR830006708A (en) 1983-10-06

Family

ID=14638229

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019810003017A KR830006708A (en) 1980-08-19 1981-08-19 Focus detection method and device

Country Status (2)

Country Link
JP (1) JPS5738404A (en)
KR (1) KR830006708A (en)

Also Published As

Publication number Publication date
JPS5738404A (en) 1982-03-03

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