发明名称 |
Image sensor and image-capturing apparatus with imaging pixel and focusing pixel having light shield layers including openings |
摘要 |
The capacitance of a charge-accumulating layer of an imaging pixel is made different from that of a charge-accumulating layer of a focusing pixel, thereby reducing the difference in saturation capacitance due to the difference between the light-reception efficiencies of the imaging pixel and the focusing pixel. The ratio between the capacitance of the charge-accumulating layer of the imaging pixel and that of the charge-accumulating layer of the focusing pixel is determined in consideration of a variation in ratio between the light-reception efficiencies of the imaging pixel and the focusing pixel with a change in at least one of the exit pupil distance and the aperture value. |
申请公布号 |
US8872950(B2) |
申请公布日期 |
2014.10.28 |
申请号 |
US201213424865 |
申请日期 |
2012.03.20 |
申请人 |
Canon Kabushiki Kaisha |
发明人 |
Fukuda Koichi |
分类号 |
H04N3/14;H04N5/335;G03B13/00;H04N5/232;H04N5/369;H01L27/146;H04N9/04;H04N5/225 |
主分类号 |
H04N3/14 |
代理机构 |
Cowan, Liebowitz & Latman, P.C. |
代理人 |
Cowan, Liebowitz & Latman, P.C. |
主权项 |
1. An image sensor comprising:
an imaging pixel which includes a first charge-accumulating layer and receives a light flux that passes through a first pupil area of an imaging optical system, and a focusing pixel which includes a second charge-accumulating layer and receives a light flux that passes through a second pupil area of the imaging optical system, wherein the focusing pixel further comprises a light-shielding layer which includes an opening and is formed therein so that the first pupil area is larger than the second pupil area, and the first pupil area has a position of center of gravity different from a position of center of gravity of the second pupil area, and wherein a ratio between a capacitance of the first charge-accumulating layer and a capacitance of the second charge-accumulating layer has a value determined in accordance with one of an average value and a value closest to one, of a ratio between light-reception efficiency of the imaging pixel and light-reception efficiency of the focusing pixel, the ratio varies depending on a change in at least one of an exit pupil distance and an aperture value of the imaging optical system. |
地址 |
Tokyo JP |