I pulled up the patent and skimmed thru it. What the patent is about is a very complex method for improving the accuracy of DPAF. It involves changes in af accuracy when a subject color changes.
The effect is small. But, if we get into a high mp sensor where the dual pixels are spaced closely, we need more accurate focusing to get the full benefit of the higher pixel density. Thus, the more complex design. There are two ways given to accomplish the improvement which involves different pixel configurations.
This patent may very well be incorporated in the new 32mp APS-C sensor, and in a upcoming FF 83 MP sensor, but its about improving the AF accuracy.
"According to the present invention, it is possible to provide an imaging device in which a change in focus detection accuracy due to a color of a subject or a color shading is reduced. "
This is a more complicated version of the patent claims which discusses how its accomplished.
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[Patent Claims]
[Claim 1]
An imaging element includes a plurality of imaging pixels on an imaging surface.
The imaging pixel
A plurality of divided photoelectric conversion parts for performing focus adjustment by the pupil division phase difference system ;
A lens for guiding light to the photoelectric conversion part ;
An internal lens arranged on the lens and the photoelectric conversion unit for the imaging pixel and arranged eccentrically toward the center of the imaging element group with respect to the center of the imaging pixel as it moves away from the center of the imaging element group, and focuses the incident light on the imaging pixel ;
A color filter for limiting a wavelength band of light guided to the photoelectric conversion part ;
It is an imaging pixel which **,
The first imaging pixel comprises a first color filter representing a first wavelength band and a first internal lens having a first eccentricity.
The 2 imaging pixel includes a 2 color filter which represents a 2 wavelength band longer than the first wavelength band, and a 2 internal lens which has a 2 eccentricity of which the first eccentricity is large.
The image sensor characterized by things.
[Claim 2]
An imaging element includes a plurality of imaging pixels on an imaging surface.
The imaging pixel
A plurality of divided photoelectric conversion parts for performing focus adjustment by the pupil division phase difference system ;
A lens for guiding light to the photoelectric conversion part ;
A color filter for limiting a wavelength band of light guided to the photoelectric conversion part ;
It is an imaging pixel which **,
A first imaging pixel ;
A first color filter expressing a first wavelength band and an internal lens between the lens and the plurality of divided photoelectric conversion parts are provided.
A 2 imaging pixel is provided with a 2 color filter which represents a 2 wavelength band longer than a first wavelength band and an internal lens between the lens and the plurality of divided photoelectric conversion sections.
The image sensor characterized by things. "