Focus detection device for image forming optical system, imaging apparatus, and focus detection method for image forming optical system
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G03B-003/10
G03B-013/34
출원번호
UP-0038731
(2008-02-27)
등록번호
US-7805067
(2010-10-21)
우선권정보
JP-2007-047526(2007-02-27)
발명자
/ 주소
Utagawa, Ken
출원인 / 주소
Nikon Corporation
대리인 / 주소
Ditthavong Mori & Steiner, P.C.
인용정보
피인용 횟수 :
1인용 특허 :
11
초록▼
A focus detection device for an image forming optical system includes a micro-lens array constituted with a plurality of two-dimensionally arrayed micro-lenses, a light-receiving element array that includes a plurality of light-receiving element s receiving a light flux from the image forming optica
A focus detection device for an image forming optical system includes a micro-lens array constituted with a plurality of two-dimensionally arrayed micro-lenses, a light-receiving element array that includes a plurality of light-receiving element s receiving a light flux from the image forming optical system via the micro-lenses, the plurality of light-receiving elements being disposed in correspondence to each micro-lens, and a focus detection unit that generates image data representing an image formed by the image forming optical system and a focus detection signal, which corresponds to a focus adjustment state at the image forming optical system, based upon signals output from the light-receiving elements at the light-receiving element array, and that detects the focus adjustment state at the image forming optical system based upon the image data and the focus detection signal.
대표청구항▼
What is claimed is: 1. A focus detection device for an image forming optical system, comprising: a micro-lens array constituted with a plurality of two-dimensionally arrayed micro-lenses; a light-receiving element array that includes a plurality of light-receiving elements receiving a light flux fr
What is claimed is: 1. A focus detection device for an image forming optical system, comprising: a micro-lens array constituted with a plurality of two-dimensionally arrayed micro-lenses; a light-receiving element array that includes a plurality of light-receiving elements receiving a light flux from the image forming optical system via the micro-lenses, the plurality of light-receiving elements being two-dimensionally disposed in correspondence to each micro-lens and outputting signals; an area setting unit that sets at least one focus detection area within a photographic image plane of the image forming optical system; an image range setting unit that sets an image range in which the focus detection area is centered; a contrast detection unit that detects a contrast of a subject image in the image range based upon the signals and outputs contrast information; a focus detection region setting unit that sets a focus detection region in the image range based upon the contrast information, the focus detection region being smaller than the image range; and a focus detection unit that detects a focus adjustment state of the image forming optical system based upon the signals, the signals being output from the light-receiving elements within the focus detection region set by the region setting unit. 2. A focus detection device for an image forming optical system according to claim 1, wherein: the focus detection unit detects the focus adjustment state of the image forming optical system by using a focus detection signal, the focus detection signal being the signals corresponding an extent of shift between images formed with a pair of light fluxes having passed through different portions of pupil at the image forming optical system. 3. A focus detection device for an image forming optical system according to claim 1, wherein: the focus detection region setting unit sets the focus detection region at the position where the contrast of the subject image is represented by a value equal to or greater than a predetermined value. 4. A focus detection device for an image forming optical system according to claim 3, wherein: the contrast detection unit detects the contrast of the subject image manifesting along a first direction in the image range; and the focus detection region setting unit sets the focus detection region at the position where the contrast of the subject image is represented by a value equal to or greater than the predetermined value. 5. A focus detection device for an image forming optical system according to claim 4, wherein: the contrast detection unit detects the contrast of the subject image manifesting along a second direction different from the first direction in the image range; and the focus detection region setting unit sets the focus detection region at the position where the contrast of the subject image is represented by a value equal to or greater than the predetermined value. 6. A focus detection device for an image forming optical system according to claim 1, wherein: after the contrast detection unit detects the contrast of the subject image in the image range at a first time point and outputs first contrast information, the contrast detection unit detects the contrast of the subject image at a second time point and outputs second contrast information; and the focus detection region setting unit adjusts the position of the focus detection region to a position at which the second contrast information contains characteristics identical to the characteristics of the first contrast information. 7. A focus detection device for an image forming optical system according to claim 1, wherein: the contrast detection unit detects the contrast of the subject image by selectively using the signals obtained from the plurality of light-receiving elements corresponding to each micro-lens. 8. An imaging apparatus comprising: an image sensor that receives a light flux from an image forming optical system; a micro-lens array constituted with a plurality of two-dimensionally arrayed micro-lenses; a light-receiving element array that includes a plurality of light-receiving elements receiving a light flux from the image forming optical system via the micro-lenses, the plurality of light-receiving elements being two-dimensionally disposed in correspondence to each micro-lens and outputting signals; an area setting unit that sets at least one focus detection area within a photographic image plane of the image forming optical system; an image range setting unit that sets an image range in which the focus detection area is centered; a contrast detection unit that detects a contrast of a subject image in the image range based upon the signals and outputs contrast information; a focus detection region setting unit that sets a focus detection region in the image range based upon the contrast information, the focus detection region being smaller than the image range; and a focus detection unit that detects a focus adjustment state of the image forming optical system based upon the signals, the signals being output from the light-receiving elements within the focus detection region set by the region setting unit. 9. A focus detection method for an image forming optical system, comprising: providing a micro-lens array constituted with a plurality of two-dimensionally arrayed micro-lenses; and a light-receiving element array that includes a plurality of light-receiving elements receiving a light flux from the image forming optical system via the micro-lenses, the plurality of light-receiving elements being two-dimensionally disposed in correspondence to each micro-lens and outputting signals; setting at least one focus detection area within a photographic image plane of the image forming optical system; setting an image range in which the focus detection area is centered; detecting a contrast of a subject image in the image range based upon the signals; outputting contrast information; setting a focus detection region in the image range based upon the contrast information, the focus detection region being smaller than the image range; and detecting a focus adjustment state of the image forming optical system based upon the signals, the signals being output from the light-receiving elements within the focus detection region set by the region setting unit. 10. A focus detection method according to claim 9, wherein the focus adjustment state of the image forming optical system is detected by using a focus detection signal, the focus detection signal being the signals corresponding an extent of shift between images formed with a pair of light fluxes having passed through different portions of pupil at the image forming optical system.
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