Focus detection device and image pick-up device
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G02B-007/04
G02B-027/40
G02B-027/64
출원번호
UP-0155737
(2008-06-09)
등록번호
US-7767946
(2010-08-24)
우선권정보
JP-2007-153486(2007-06-11)
발명자
/ 주소
Utagawa, Ken
출원인 / 주소
Nikon Corporation
대리인 / 주소
Oliff & Berridge, PLC
인용정보
피인용 횟수 :
1인용 특허 :
5
초록▼
A focus detection device includes a micro lens array having a plurality of micro lenses, a light receiving element array having a plurality of light receiving elements for each micro lens and that receives light rays from a plurality of partial areas in which pupils of an imaging optical system are
A focus detection device includes a micro lens array having a plurality of micro lenses, a light receiving element array having a plurality of light receiving elements for each micro lens and that receives light rays from a plurality of partial areas in which pupils of an imaging optical system are different from each other, in a plurality of light receiving elements respectively through each micro lens and a focus detection calculation circuit. The device generates at least three signal strings respectively corresponding to images of light rays which have been transmitted through at least three of the partial areas, based on signals output from the plurality of light receiving elements of the light receiving element array. The device obtains, from the at least three signal strings, shift amounts of two signal strings corresponding to two partial areas, and detects a focus adjustment state of an imaging optical system based on the obtained plurality of shifts amounts.
대표청구항▼
What is claimed is: 1. A focus detection device comprising: a micro lens array having a plurality of micro lenses; a light receiving element array having three or more light receiving elements that are all substantially a same shape that are aligned in one direction for each of the micro lenses, th
What is claimed is: 1. A focus detection device comprising: a micro lens array having a plurality of micro lenses; a light receiving element array having three or more light receiving elements that are all substantially a same shape that are aligned in one direction for each of the micro lenses, the three or more light receiving elements receiving via their respective micro lens, light rays from three or more partial areas of a pupil of one or more pupils, wherein each of the one or more pupils of an imaging optical system are different from each other; a signal string generator that generates at least three signal strings respectively corresponding to images of the light rays which have been transmitted through each of the three or more partial areas, based on signals outputted from the three or more light receiving elements of the light receiving element array; a focus detector that obtains, within the at least three signal strings, shift amounts of two of the signal strings corresponding to two of the three or more partial areas, for a plurality of adjacent pairs of partial areas of the three or more partial areas, and determines a focus adjustment state of the imaging optical system based on the obtained plurality of shift amounts; and wherein the plurality of shift amounts include a shift amount between a first signal string corresponding to a first partial area within the three or more partial areas and a second signal string corresponding to a second partial area different from the first partial area, and a shift amount between the first signal string and a third signal string corresponding to a third partial area different from the first partial area and the second partial area. 2. The focus detection device according to claim 1, wherein the signal string generator generates a plurality of signal strings based on light rays that have been transmitted through at least three partial areas included in an area corresponding to an aperture stop of the imaging optical system. 3. The focus detection device according to claim 1, wherein the signal string generator generates the plurality of signal strings by adding outputs of the three or more light receiving elements of the light receiving element array. 4. The focus detection device according to claim 1, wherein the three or more light receiving elements of the light receiving element array are one-dimensionally arranged. 5. The focus detection device according to claim 1, wherein the three or more light receiving elements of the light receiving element array are two-dimensionally arranged. 6. An image pick-up device comprising the focus detection device of claim 1. 7. A focus detection device comprising: a micro lens array having a plurality of micro lenses; a light receiving element array having three or more light receiving elements that are all substantially a same shape that are aligned in one direction for each of the micro lenses, the three or more light receiving elements receiving via their respective micro lens, light rays from three or more partial areas of a pupil of one or more pupils, wherein each of the one or more pupils of an imaging optical system are different from each other; a signal string generator that generates at least three signal strings respectively corresponding to images of the light rays which have been transmitted through each of the three or more partial areas, based on signals outputted from the three or more light receiving elements of the light receiving element array; a focus detector that obtains, within the at least three signal strings, shift amounts of two of the signal strings corresponding to two of the three or more partial areas, for a plurality of adjacent pairs of partial areas of the three or more partial areas, and determines a focus adjustment state of the imaging optical system based on the obtained plurality of shift amounts; wherein the plurality of shift amounts include a shift amount between a first signal string corresponding to a first partial area within the three or more partial areas and a second signal string corresponding to a second partial area different from the first partial area, and a shift amount between the first signal string and a third signal string corresponding to a third partial area different from the first partial area and the second partial area; and wherein the focus detector determines the focus adjustment state by weighted addition of respective ones of the plurality of shift amounts. 8. A focus detection device comprising: a micro lens array having a plurality of micro lenses; a light receiving element array having three or more light receiving elements that are all substantially a same shape that are aligned in one direction for each of the micro lenses, the three or more light receiving elements receiving via their respective micro lens, light rays from three or more partial areas of a pupil of one or more pupils, wherein each of the one or more pupils of an imaging optical system are different from each other; a signal string generator that generates at least three signal strings respectively corresponding to images of the light rays which have been transmitted through each of the three or more partial areas, based on signals outputted from the three or more light receiving elements of the light receiving element array; a focus detector that obtains, within the at least three signal strings, shift amounts of two of the signal strings corresponding to two of the three or more partial areas, for a plurality of adjacent pairs of partial areas of the three or more partial areas, and determines a focus adjustment state of the imaging optical system based on the obtained plurality of shift amounts; wherein the plurality of shift amounts include a shift amount between a first signal string corresponding to a first partial area within the three or more partial areas and a second signal string corresponding to a second partial area different from the first partial area, and a shift amount between the first signal string and a third signal string corresponding to a third partial area different from the first partial area and the second partial area and wherein the focus detector multiplies and adds separate conversion coefficients of the shift amounts for two respective signal strings corresponding to the two partial areas of the three or more partial areas to determine a defocus amount of the imaging optical system. 9. A focus detection device comprising: a micro lens array having a plurality of micro lenses; a light receiving element array having three or more light receiving elements that are all substantially a same shape that are aligned in one direction for each of the micro lenses, the three or more light receiving elements receiving via their respective micro lens, light rays from three or more partial areas of a pupil of one or more pupils, wherein each of the one or more pupils of an imaging optical system are different from each other; a signal string generator that generates at least three signal strings respectively corresponding to images of the light rays which have been transmitted through each of the three or more partial areas, based on signals outputted from the three or more light receiving elements of the light receiving element array; a focus detector that obtains, within the at least three signal strings, shift amounts of two of the signal strings corresponding to two of the three or more partial areas, for a plurality of adjacent pairs of partial areas of the three or more partial areas, and determines a focus adjustment state of the imaging optical system based on the obtained plurality of shift amounts; wherein the plurality of shift amounts include a shift amount between a first signal string corresponding to a first partial area within the three or more partial areas and a second signal string corresponding to a second partial area different from the first partial area, and a shift amount between the first signal string and a third signal string corresponding to a third partial area different from the first partial area and the second partial area; and wherein the conversion coefficients are set according to positions of the three or more light receiving elements of the light receiving element array. 10. A method of determining a focus adjustment state of an imaging optical system, the method comprising: passing light through a micro lens array having a plurality of micro lenses; receiving the light having passed through the micro lens array with a light receiving element array having three or more light receiving elements that are all substantially the same shape that are aligned in one direction for each of the micro lenses, the plurality of light receiving elements receiving via their respective micro lens, light rays from three or more partial areas of a pupil of one or more pupils, wherein each of the one or more pupils of the imaging optical system are different from each other; generating at least three signal strings respectively corresponding to images of the light rays that have been transmitted through at least three of the three or more partial areas, based on signals output from the three or more light receiving elements of the light receiving element array; obtaining, within the at least three signal strings, shift amounts of two of the signal strings corresponding to two partial areas of the three or more partial areas, for a plurality of adjacent pairs of the three or more partial areas, and determining a focus adjustment state of the imaging optical system based on the obtained plurality of shift amounts; and wherein the plurality of shift amounts include a shift amount between a first signal string corresponding to a first partial area within the three or more partial areas and a second signal string corresponding to a second partial area different from the first partial area, and a shift amount between the first signal string and a third signal string corresponding to a third partial area different from the first partial area and the second partial area. 11. The method according to claim 10, wherein the focus adjustment state is determined by weighted addition of the respective ones of the plurality of shift amounts. 12. The method according to claim 10, wherein the focus adjustment state is determined by multiplying and adding separate conversion coefficients of the shift amounts for two of the respective signal strings corresponding to the two partial areas of the three or more partial areas to determine a defocus amount of the imaging optical system. 13. The method according to claim 12, wherein the conversion coefficients are set according to positions of the three or more light receiving elements of the light receiving element array. 14. The method according to claim 10, wherein a plurality of signal strings are generated based on light rays that have been transmitted through at least three partial areas of the three or more partial areas included in an area corresponding to an aperture stop of the imaging optical system. 15. The method according to claim 10, wherein the plurality of signal strings are generated by adding outputs of the three or more light receiving elements of the light receiving element array. 16. The method according to claim 10, wherein the three or more light receiving elements of the light receiving element array are one-dimensionally arranged. 17. The method according to claim 10, wherein the three or more light receiving elements of the light receiving element array are two-dimensionally arranged.
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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