[특허]Apparatus for detecting the focus adjusting state of an objective lens by performing filter processing

[미국특허] Apparatus for detecting the focus adjusting state of an objective lens by performing filter processing 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01J-001/20
출원번호	US-0969352 (1992-10-30)
우선권정보	JP-0315503 (1991-11-01); JP-0315505 (1991-11-01)
발명자 / 주소	Suda Yasuo (Yokohama JPX) Yamada Akira (Yokohama JPX) Odaka Yukio (Yokohama JPX) Akashi Akira (Yokohama JPX)
출원인 / 주소	Canon Kabushiki Kaisha (Tokyo JPX 03)
인용정보	피인용 횟수 : 22 인용 특허 : 0

초록 ▼

A focus detection apparatus includes an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, a photoelectric conversion element, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and a calculating unit for performing filter processing of the first and second signals, sequentially displacing the first and second signals relative to each other on the calculation basis, calculating an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions, obtaining positional deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system on the basis of the deviations. The filter processing is performed using a filter determined by the relatively displaced positions.

대표청구항 ▼

A focus detection apparatus comprising an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, photoelectric converting means, having a plurality of picture elements, for outputting first and second signals respectively corresponding to the first and second optical distributions, and calculating means for performing filter processing of the first and second signals, wherein the first and second signals are respectively processed through filters having mutually different characteristics, processed sequentially displacing the first and second signals relative to each other, calculating an evaluation amount representing a coincidence between the first and second signals at the relatively displaced positions, obtaining positional deviations between the first and second object images on the basis of a change in evaluation amount, and detecting the imaging state of the imaging optical system on the basis of the deviations, the filter processing being performed using a filter determined by the relatively displaced positions.

이 특허를 인용한 특허 (22) 인용/피인용 타임라인 분석

Furuki,Satoko, Apparatus for acquiring focussing information and method of acquiring focusing information.
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Odaka, Yukio, Camera provided with focus adjusting apparatus.
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Wang, Wei-Chung; Chen, Hui-Hsuan, Defocus calibration module for light-sensing system and method thereof.
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Ikemoto, Kiyokatsu, Distance detecting device, imaging apparatus, distance detecting method and parallax-amount detecting device.
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Kimura, Masafumi, Focal point adjusting apparatus, image-taking apparatus, interchangeable lens, conversion coefficient calibrating method, and conversion coefficient calibrating program.
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Tamaki, Yoshihito, Focus adjusting apparatus and focus adjusting method.
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Suda, Yasuo, Focus detecting device with photoelectric conversion portion having microlens and with light blocking portion having first and second openings.
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Goto Hisashi,JPX, Focus detecting optical system.
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Hashimoto, Yoshitaka; Nagano, Akihiko, Focus detection apparatus, focus detection method, and image sensing apparatus.
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Takamiya, Makoto, Focus detection apparatus, focus detection method, and image sensing apparatus.
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Uchiyama Shigeyuki (Tokyo JPX), Focus detection device and method.
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Kusaka,Yosuke, Focus detection device, optical system and focus detection method.
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Suda,Yasuo, Focus detection system for focus adjustment having differently-sized apertures and using a pair of signals formed by a pencil of rays passing through different regions of exit pupil of imaging lens.
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Uchiyama Shigeyuki (Tokyo JPX), Focus state detection device and method.
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Ishii, Hirokazu, Image pickup apparatus and camera system capable of improving calculation accuracy of defocus amount.
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Taniguchi, Hidenori, Image sensing apparatus with plural focus detection pixel groups.
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Chen, Hsin Chia; Chao, Tzu Yi; Lin, Chun Huang; Lan, Jeng Feng; Lee, Yi Fang, Method for estimation of signal frequency and displacement estimation method and device with consistency check, period prediction and compensation, and/or adaptive threshold update.
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Suda Yasuo,JPX, Optical apparatus and camera capable of line of sight detection.
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Akashi Akira (Yokohama JPX), Optical apparatus having function to detect visual axis.
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Nishioka, Kimihiko; Hayakawa, Kazuhito; Nishimura, Kazuya; Goto, Hisashi, Optical apparatus provided with variable mirror.
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Takamiya, Makoto; Nagano, Akihiko, Optical device and signal processor.
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Furuta Akiko,JPX, Optical system having a focal point detection device.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Apparatus for detecting the focus adjusting state of an objective lens by performing filter processing 원문보기