发明名称 |
Focus detection device, imaging apparatus, and method of controlling focus detection device |
摘要 |
There is provided a focus detection device including a phase difference acquisition unit that calculates an amount of deviation between light-reception amount distributions of a pair of light-receiving element groups arranged in a predetermined direction perpendicular to an optical axis direction as a phase difference, a conversion coefficient correction unit that corrects a conversion coefficient, representing a ratio of an amount of focus deviation in the optical axis direction to the phase difference when shapes of the light-reception amount distributions are same, according to a degree of discrepancy between the shapes of the light-reception amount distributions, and a defocus amount generation unit that generates the amount of focus deviation as an amount of defocus based on the corrected conversion coefficient and the phase difference. |
申请公布号 |
US8831420(B2) |
申请公布日期 |
2014.09.09 |
申请号 |
US201313951963 |
申请日期 |
2013.07.26 |
申请人 |
Sony Corporation |
发明人 |
Miyatani Yoshitaka |
分类号 |
G03B3/00;G03B13/32 |
主分类号 |
G03B3/00 |
代理机构 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
主权项 |
1. A focus detection device comprising:
circuitry including:
a phase difference acquisition unit that calculates an amount of deviation between light-reception amount distributions of a pair of light-receiving element groups arranged in a predetermined direction perpendicular to an optical axis direction as a phase difference;a conversion coefficient correction unit that corrects a conversion coefficient, representing a ratio of an amount of focus deviation in the optical axis direction to the phase difference when shapes of the light-reception amount distributions are same, according to a degree of discrepancy between the shapes of the light-reception amount distributions;a defocus amount generation unit that generates the amount of focus deviation as an amount of defocus based on the corrected conversion coefficient and the phase difference; anda discrepancy correction coefficient generation unit that calculates the pair of light-reception amount distributions based on lens aperture information indicating a shape and a position of a pupil in a lens and light-reception sensitivity distribution information indicating a distribution of light-reception sensitivities of the pair of light-receiving element groups, and generates a discrepancy correction coefficient based on the pair of light-reception amount distributions, whereinthe conversion coefficient correction unit corrects the conversion coefficient based on the discrepancy correction coefficient which is a proportion of the conversion coefficient to a ratio of the amount of defocus to the phase difference when the shapes of the light-reception amount distributions are not the same. |
地址 |
Tokyo JP |