Image-capturing element
An image-capturing element includes: a first substrate; a plurality of first pixels disposed in a matrix on the first substrate, each of the first pixels having a first light receiving element; a second substrate disposed at a position overlapping the first substrate and on a side opposite to a light receiving surface side of the first substrate when viewed from the light receiving surface side of the first substrate; a plurality of second pixels disposed in a matrix on the second substrate, each of the second pixels having a second light receiving element and a Fabry-Perot filter disposed on the light receiving surface side of the second light receiving element; and a plurality of optical systems disposed corresponding to the plurality of second pixels between the first substrate and the plurality of second pixels, the optical systems having negative refractive power.
1. An image-capturing element comprising:
a first substrate;
a plurality of first pixels disposed in a matrix on the first substrate, each of the first pixels having a first light receiving element;
a second substrate disposed at a position overlapping the first substrate and on a side opposite to a light receiving surface side of the first substrate when viewed from the light receiving surface side of the first substrate;
a plurality of second pixels disposed in a matrix on the second substrate, each of the second pixels having a second light receiving element and a Fabry-Perot filter disposed on the light receiving surface side of the second light receiving element;
a plurality of first optical systems disposed on the light receiving surface side of the first substrate, the first optical systems having a convex shape with the light receiving surface side as an upper surface, the first optical systems forming an incident light on the first light receiving element; and
a plurality of second optical systems disposed corresponding to the plurality of second pixels between the first substrate and the plurality of second pixels, the second optical systems having a concave shape with the light receiving surface side as an upper surface, the second optical systems substantially collimating the incident light diffused after being imaged by the first light receiving element so as to be irradiated perpendicularly to a light receiving surface of the second pixel.
2. The image-capturing element according to claim 1 , wherein a plurality of first microlenses respectively disposed on the light receiving surface side of the plurality of first pixels are provided.
3. The image-capturing element according to claim 1 , wherein the plurality of optical systems are disposed on a surface opposite to the light receiving surface side of the first substrate.
4. The image-capturing element according to claim 1 , wherein the plurality of optical systems are microlenses.
5. The image-capturing element according to claim 1 , wherein each of the Fabry-Perot filters has any transmission band from a plurality of kinds of transmission bands.
6. The image-capturing element according to claim 1 , wherein the plurality of optical systems are intralayer lenses.
7. The image-capturing element according to claim 1 , wherein,
among the plurality of optical systems,
the closer the optical system is disposed to the center of the first substrate, the smaller the refractive power becomes, and
the closer the optical system is disposed to the periphery of the first substrate, the larger the refractive power becomes.
8. The image-capturing element according to claim 1 , wherein,
among the plurality of optical systems,
the closer the optical system is disposed to an optical axis of an imaging optical system, the smaller the refractive power becomes, and
the further the optical system is disposed from the optical axis of the imaging optical system, the larger the refractive power becomes.
9. The image-capturing element according to claim 1 , wherein
each of the first pixels has a color filter disposed on the light receiving surface side of the first light receiving element,
the color filters are disposed in a Bayer array, and
the plurality of second pixels and the plurality of optical systems are disposed so as to overlap the color filters transmitting blue light when viewed from the light receiving surface side of the first substrate.
10. The image-capturing element according to claim 1 , wherein
each of the first pixels has a color filter disposed on the light receiving surface side of the first light receiving element,
the color filters are disposed in a Bayer array,
a part of the first pixels in which color filters transmitting green light are disposed is provided as through holes, and
the plurality of second pixels and the plurality of optical systems are disposed so as to overlap the through holes when viewed from the light receiving surface side of the first substrate.
11. The image-capturing element according to claim 1 , wherein
each of the first pixels has a color filter disposed on the light receiving surface side of the first light receiving element,
the color filters are disposed in a Bayer array,
a part of the color filters transmitting green light is removed, and
the plurality of second pixels and the plurality of optical systems are disposed so as to overlap the first pixels with the color filters removed when viewed from the light receiving surface side of the first substrate.
12. The image-capturing element according to claim 1 , wherein the first substrate, the plurality of first pixels, the second substrate, the plurality of second pixels, and the plurality of optical systems are disposed at the tip of an endoscope.
13. The image-capturing element according to claim 1 , wherein the plurality of second pixels are disposed at positions facing the plurality of first pixels, respectively.
14. The image-capturing element according to claim 1 , wherein the plurality of optical systems refracts light transmitted through the first pixel so as to be irradiated perpendicularly to a light receiving surface of the second pixel.