KR930022137A - Camera auto focusing circuit - Google Patents

Camera auto focusing circuit Download PDF

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Publication number
KR930022137A
KR930022137A KR1019920006566A KR920006566A KR930022137A KR 930022137 A KR930022137 A KR 930022137A KR 1019920006566 A KR1019920006566 A KR 1019920006566A KR 920006566 A KR920006566 A KR 920006566A KR 930022137 A KR930022137 A KR 930022137A
Authority
KR
South Korea
Prior art keywords
signal
camera
focus
outputs
automatic focusing
Prior art date
Application number
KR1019920006566A
Other languages
Korean (ko)
Other versions
KR950007031B1 (en
Inventor
차도현
Original Assignee
이헌조
주식회사 금성사
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 이헌조, 주식회사 금성사 filed Critical 이헌조
Priority to KR1019920006566A priority Critical patent/KR950007031B1/en
Priority to JP5091462A priority patent/JPH0698241A/en
Publication of KR930022137A publication Critical patent/KR930022137A/en
Application granted granted Critical
Publication of KR950007031B1 publication Critical patent/KR950007031B1/en

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

본 발명은 카메라의 촛점 자동 조절회로에 관한 것으로, 일반적으로 사용되고 있는 자동 촛점 조절회로는 고역모터를 사용하며 촛점 평가치를 추출할 때에 영상신호에 고역 성분이 존재할 경우에만 자동 촛점을 행할 수 있지만, 수평 무늬를 갖는 파사체와 같이 영상신호에 고역성분이 존재하지 않아 자동 촛점을 행할 수 없어 오동작을 유발하는 문제점을 가지고 있다.The present invention relates to an automatic focusing circuit of a camera. A generally used automatic focusing circuit uses a high-frequency motor and can perform automatic focus only when a high-frequency component exists in an image signal when extracting a focus evaluation value. There is a problem in that a high frequency component does not exist in a video signal such as a patterned wave body, which causes a malfunction because automatic focus cannot be performed.

이에 따라 본 발명은 상기와 같은 종래의 자동 촛점 조절회로에 따르는 결함을 감안하여 수평 무늬를 갖는 피사체에 대하여도 자동 촛점의 수행이 가능한 카메라 회로를 제공하기 위한 목적에서 창안된 것이다.Accordingly, the present invention was devised in order to provide a camera circuit capable of performing automatic focusing on a subject having a horizontal pattern in view of the defects caused by the conventional automatic focusing circuit as described above.

Description

카메라의 자동 촛점 조정회로Camera auto focusing circuit

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

제2도(a) 및 (b)는 피사체와 영상 신호의 고역 성분의 관계도.2 (a) and (b) are diagrams showing a relationship between a subject and a high frequency component of an image signal.

제3도는 본 발명 카메라의 자동 촛점 조정회로도.3 is an automatic focus adjustment circuit of the camera of the present invention.

제4도는 수평 동기신호와 제3도의 카운터의 동작 타이민도.4 is an operation of the horizontal synchronization signal and the counter of FIG.

제5도는 제3도의 마이콤에서 수행하는 제어의 흐름도.5 is a flowchart of control performed by the microcomputer of FIG.

Claims (1)

영상 신호 처리부(5)로 부터 수평동기신호를 입력하여 이를 일정 듀티비를 갖는 신호로 분주하는 카운터(20)와, 상기 카운터(20)에 의해 제어되어 스위칭작용을 통해 영상신호를 선별적 경로를 통해 출력하는 스위치(21)와, 수평동기 신호의 각 주기마다 상기 스위치(21)로부터 교번적으로 인가되는 영상신호를 입력하여 그 피크치를 검출하는 피크검출기(22, 23)와, 상기 피크 검출기(22,23)의 출력을 상호 비교하여 그 피크치를 검출하는 피크 검출기(24)와, 상기 피크 검출기(24)로부터의 출력 아날로그 신호를 디지탈 신호로 변환하는 A/D변환기 (25)와, 상기 A/D변환기(25)로부터 촛점 평가치를 입력하여 그 증감 상태에 따라서 카메라의 렌즈를 조절하여 촛점을 자동으로 맞추도록 제어신호를 출력하는 마이콤(26)으로 된 것을 특징으로 하는 카메라의 자동 촛점 조절회로.A counter 20 for inputting a horizontal synchronous signal from the image signal processor 5 and dividing it into a signal having a certain duty ratio, and controlled by the counter 20 to selectively route the video signal through a switching action. A peak detector 22, 23 for inputting a switch 21 to be output through the image signal, an image signal that is alternately applied from the switch 21 for each period of the horizontal synchronization signal, and detecting the peak value; A peak detector 24 for comparing the outputs of the 22 and 23 outputs and detecting the peak value, an A / D converter 25 for converting the output analog signal from the peak detector 24 into a digital signal, and the A A micro-computation of the camera, characterized in that the input of the focus evaluation value from the / D converter 25 and outputs a control signal to automatically adjust the focus by adjusting the lens of the camera according to the increase or decrease state. Cut-off. ※ 참고사항 : 최초출원 내용에 의하여 공개되는 것임.※ Note: This is to be disclosed by the original application.
KR1019920006566A 1992-04-18 1992-04-18 Auto-focus controlling circuit for camera KR950007031B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019920006566A KR950007031B1 (en) 1992-04-18 1992-04-18 Auto-focus controlling circuit for camera
JP5091462A JPH0698241A (en) 1992-04-18 1993-04-19 Automatic focus-adjusting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920006566A KR950007031B1 (en) 1992-04-18 1992-04-18 Auto-focus controlling circuit for camera

Publications (2)

Publication Number Publication Date
KR930022137A true KR930022137A (en) 1993-11-23
KR950007031B1 KR950007031B1 (en) 1995-06-26

Family

ID=19331995

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019920006566A KR950007031B1 (en) 1992-04-18 1992-04-18 Auto-focus controlling circuit for camera

Country Status (2)

Country Link
JP (1) JPH0698241A (en)
KR (1) KR950007031B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100844135B1 (en) * 2006-09-14 2008-07-04 삼성전자주식회사 Auto focus control method and photographing apparatus having auto focus function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100844135B1 (en) * 2006-09-14 2008-07-04 삼성전자주식회사 Auto focus control method and photographing apparatus having auto focus function

Also Published As

Publication number Publication date
KR950007031B1 (en) 1995-06-26
JPH0698241A (en) 1994-04-08

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