[특허]Automatic focusing device using phase difference detection

[미국특허] Automatic focusing device using phase difference detection 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04N-052/32
출원번호	US-0469900 (1995-06-06)
우선권정보	JP-0086538 (1992-03-10)
발명자 / 주소	Sasakura Takao,JPX
출원인 / 주소	Canon Kabushiki Kaisha, JPX
대리인 / 주소	Robin, Blecker & Daley
인용정보	피인용 횟수 : 18 인용 특허 : 9

초록 ▼

In a still video camera or the like which employs a solid-state image sensor, such as a CCD, a first calculation of the amount of correlation in an AF sensor is executed by using a smaller number of pixels and a larger amount of shifting, and second and subsequent calculations of the amount of correlation are executed by using a larger number of pixels and a smaller amount of shifting. Accordingly, it is possible to reliably detect a large-defocus state through the first calculation, whereby it is possible to omit an unnecessary calculation to reduce the required calculation time. The automatic focusing device uses a phase difference detection method in which a focus state is detected by detecting the deviation between two incident images. The device includes two sensor portions for receiving two images which are each a variable in their image forming portions according to a focus state. The device also includes a correlation computing device for computing the correlation between signals from the two sensor portions by relatively shifting the output signals with a predetermined pitch. The device also includes a driver for driving a focus lens to the in-focus point according to the outputs of the computing device and also includes a control for changing the predetermined pitch with which the output signals of the two sensor portions are shifted.

대표청구항 ▼

[ What is claimed is:] [1.] An automatic focusing device of phase-difference detection type, in which a focus state is detected by detecting deviation between two incident images, comprising:a) image sensing means composed of two sensor portions for receiving two images each variable in their image forming positions according to the focus state,b) correlation computing means for computing correlation between output signals from the two sensor portions by relatively shifting the output signals with a predetermined pitch,c) driving means for driving a focus lens to an in-focus point according the outputs of the correlation computing means, andd) control means for changing a predetermined range with which the output signals of the two sensor portions are shifted and a unit of a shifting pitch between the two sensor portions between a rough focus detecting mode and a high accuracy focus detecting mode and changing shiftable ranges of the two sensor portions for computing the correlation on the image sensing means so that a number of pixels of the sensor portions operable in the high accuracy focus detecting mode is larger than that in the rough focus detecting mode and the unit of the shifting pitch in the high accuracy focus detecting mode is smaller than in the rough focus detecting mode.

이 특허에 인용된 특허 (9) 인용/피인용 타임라인 분석

Eguchi Mitsuo (Saitama JPX) Tagawa Kiyoharu (Saitama JPX) Ogawa Hitoshi (Saitama JPX) Bandai Mikio (Saitama JPX) Nagashima Nobuharu (Saitama JPX), Automatic focus detecting device.
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Suekane Hisashi (Tokyo JPX), Automatic focusing apparatus.
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Tsukamoto Takeya (Osaka JPX) Ootsuka Hiroshi (Osaka JPX) Itoh Masatoshi (Osaka JPX) Hasimoto Nobuo (Osaka JPX), Camera having a zoom lens system.
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Kojima Kiyonobu (Kanagawa JPX), Electronic camera and device for panoramic imaging and object searching.
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Matsui Toru (Sakai JPX) Kimura Kazuo (Sakai JPX), Focus detecting apparatus with both passive and active focus capability.
상세보기
Ishida Tokuji (Osaka JPX) Kozakai Katsumi (Sakai JPX) Hamada Masataka (Osaka JPX), Focus detecting device.
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Morimoto Yasuhiro (Takatsuki JPX) Saito Mitsuru (Ibaraki JPX) Yoshida Tadahiro (Takatsuki JPX) Taniguchi Nobuyuki (Nishinomiya JPX), Interchangeable film back or still video back still camera system.
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Bell Cynthia S. (Webster NY) Anagnostopoulos Constantine N. (Mendon NY) Williams Paul M. (Rochester NY) Gaboury Michael J. (Spencerport NY) Koudelka James R. (Williamson NY), Multiple photodiode array for light metering.
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Smith William V. (Memphis TN), Video tape recorder control system.
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이 특허를 인용한 특허 (18) 인용/피인용 타임라인 분석

Masaki Higashihara JP; Masato Ikeda JP, Auto focusing device and a focus detecting device for determining the phase difference between image signals.
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Ogino,Hiroyuki, Automatic focusing apparatus.
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Shono,Tetsuji, Digital still camera with shifting focus lens.
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Fukuda,Tsuyoshi, Electronic camera.
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Tamune, Michihiro, Electronic still camera and information recording appartus.
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Ito, Junichi, Electronic still camera with capability to perform optimal focus detection according to selected mode.
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Ito, Junichi, Electronic still camera with capability to perform optimal focus detection according to selected mode.
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Ito,Junichi, Electronic still camera with capability to perform optimal focus detection according to selected mode.
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Ishii, Kazunori, Focus control apparatus and control method therefor.
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Ishii, Kazunori, Focus control apparatus and control method therefor.
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Ide, Masataka, Focus detecting device.
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Inoue, Daisuke; Takahashi, Hidekazu, Focus detecting device and camera system using the same device.
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Takamiya, Makoto, Focus detection apparatus, focus detection method, and image sensing apparatus.
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Oikawa,Makoto, Focus detection based on an opening pupil ratio.
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Karasawa, Katsumi, Focus detector, and lens apparatus and image pickup apparatus including the same.
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Ikeda,Masato, Focus sensing apparatus, focus sensing method using phase-differential detection and computer-readable storage medium therefor.
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Yuyama, Masami, Image pick-up apparatus, method of controlling white balance, and program of controlling white balance.
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Endo, Hiroshi, Imaging device for generating stereoscopic image.
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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] Automatic focusing device using phase difference detection 원문보기