KR940016033A - Focus error detection method - Google Patents
Focus error detection method Download PDFInfo
- Publication number
- KR940016033A KR940016033A KR1019920027540A KR920027540A KR940016033A KR 940016033 A KR940016033 A KR 940016033A KR 1019920027540 A KR1019920027540 A KR 1019920027540A KR 920027540 A KR920027540 A KR 920027540A KR 940016033 A KR940016033 A KR 940016033A
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- KR
- South Korea
- Prior art keywords
- focus error
- detection method
- photodetectors
- reflected light
- detecting
- Prior art date
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- Optical Recording Or Reproduction (AREA)
Abstract
피사체에 대하여 평행광을 집속하는 렌즈요소의 포커스 에러블 검출하기 위한 포커스 에러 검출방법이 개시되어 있다. 개시된 검출방법은 개선된 임계각 프리즘법으로 광량손실이 적고 큰 진폭의 포커스 에러 신호를 검출하기 위한 것으로, 임계각 프리즘의 반사경면을 반사광 경로에 배치하고, 또한 그 반사경면의 반사측과 투과측의 반사광을 각각 검출하는 2개의 2분할 광검출기를 각각 배치한다. 그리고 양측 광검출기의 출력신호의 동일부호끼리 중첩되도록 회로를 꾸민다. 개시의 방법은 기록재생용 광픽업에 있어서의 광손실을 줄이고 큰 진폭의 포커스 에러 신호로 효율적인 포커스 서보를 하는데에 아주 효과적이다.A focus error detection method for detecting focus error of a lens element focusing parallel light on a subject is disclosed. The disclosed detection method is an improved critical angle prism method for detecting a focus error signal with a small amount of light loss and a large amplitude. The reflective mirror surface of the critical angle prism is disposed in the reflected light path, and the reflected light on the reflective side and the transmissive side of the reflective mirror prism. Two two-segment photodetectors are respectively arranged to detect. The circuits are arranged so that the same codes of the output signals of both photodetectors overlap. The method of the present disclosure is very effective for reducing optical loss in recording and reproducing optical pickup and for efficient focus servo with a large amplitude focus error signal.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제3도는 본 발명의 개선된 임계각 프리즘법으로 대물렌즈의 포커스 에러신호를 검출하여 포커스 서보를 행하는 다른 광픽업의 일부 구성을 보인 광학적 배치도, 제4도는 본 발명의 개선된 임계각 프리즘법에 의한 포커스 에러 검출방법을 설명하기 위하여 나타낸, 제3도의 광디스크와 대물렌즈의 위치에 따른 반사광의 프로파일로서, (가)는 정상 포커스 상태, (나)는 광디스크가 가까이 근접한 상태, 그리고 (다)는 광디스크가 멀리 떨어진 상태이다.FIG. 3 is an optical layout showing a partial configuration of another optical pickup which performs focus servo by detecting a focus error signal of an objective lens with the improved critical angle prism method of the present invention, and FIG. 4 is a focus view by the improved critical angle prism method of the present invention. The profile of the reflected light according to the position of the optical disk and the objective lens of FIG. 3, which is shown for explaining the error detection method, (a) is in a normal focus state, (b) is in a close proximity of the optical disk, and (c) is an optical disk. It is far away.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019920027540A KR940016033A (en) | 1992-12-31 | 1992-12-31 | Focus error detection method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019920027540A KR940016033A (en) | 1992-12-31 | 1992-12-31 | Focus error detection method |
Publications (1)
Publication Number | Publication Date |
---|---|
KR940016033A true KR940016033A (en) | 1994-07-22 |
Family
ID=67220145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019920027540A KR940016033A (en) | 1992-12-31 | 1992-12-31 | Focus error detection method |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR940016033A (en) |
-
1992
- 1992-12-31 KR KR1019920027540A patent/KR940016033A/en not_active Application Discontinuation
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A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
E601 | Decision to refuse application |