Image pickup device and production method thereof
An image pickup device is disclosed that has little deformation caused by thermal expansion of a transparent resin for sealing an image pickup element. The image pickup device includes an image pickup element having a light receiving surface, a micro-lens for condensing incident light to the image pickup element, a first transparent plate disposed on the light receiving surface of the image pickup element with the micro-lens in between, a transparent resin that seals the image pickup element and the first transparent plate, and a second transparent plate disposed on the transparent resin to face the first transparent plate.
1. An image pickup device, comprising:
an image pickup element having a light receiving surface;
a lens arranged on the light receiving surface;
a first transparent plate made of a glass material disposed over the lens on the light receiving surface of the image pickup element, but not directly contacting the light receiving surface, the first transparent plate having a surface, the surface facing the lens, and the surface being flat at least at a position directly above a position of the lens, wherein a substance different from both the first transparent plate and the lens is in existence between the surface of the first transparent plate and the lens;
a transparent material disposed on an upper surface of the first transparent plate and that seals the image pickup element; and
a second transparent plate made of a glass material directly contacting an upper surface of the transparent material,
wherein the light receiving surface includes a photodiode, and light incident from outside the image pickup device reaches the photodiode through the lens after passing through the first transparent plate, and
wherein the lens, the first transparent plate, and the second transparent plate are arranged in the following order: the lens, the first transparent plate, and the second transparent plate.
2. The image pickup device as claimed in claim 1 , wherein a surface area of the second transparent plate is greater than a surface area of the first transparent plate.
3. The image pickup device as claimed in claim 1 , wherein air is disposed between the first transparent plate and the image pickup element.
4. The image pickup device as claimed in claim 1 , wherein a light transmission adhesive material is disposed between the first transparent plate and the image pickup element.
5. The image pickup device as claimed in claim 1 , wherein the first transparent plate is in direct contact with at least a portion of the lens.
6. The image pickup device as claimed in claim 1 , wherein the second transparent plate is in contact with the first transparent plate.
7. The image pickup device as claimed in claim 1 , wherein the transparent material is interposed between the first transparent plate and the second transparent plate.
8. The image pickup device as claimed in claim 1 , wherein the transparent material is a resin.
9. A method of producing an image pickup device, comprising:
disposing an image pickup element having a light receiving surface on a substrate;
disposing a lens on the light receiving surface;
disposing a first transparent plate made of a glass material on the image pickup element and over the lens, the first transparent plate having a surface, the surface facing the lens, and the surface being flat at least at a position directly above a position of the lens, wherein a substance different from both the first transparent plate and the lens is in existence between the surface of the first transparent plate and the lens;
connecting the image pickup element with an electrode arranged on the substrate;
arranging a second transparent plate made of a glass material in a mold;
arranging the substrate on which the image pickup element and the first transparent plate are disposed so that the first transparent plate faces the second transparent plate; and
sealing the image pickup element and an upper surface of the first transparent plate with a transparent material so that the second transparent plate faces the first transparent plate across the material,
wherein the light receiving surface includes a photodiode, and light incident from outside the image pickup device reaches the photodiode through the lens after passing through the first transparent plate, and
wherein the lens, the first transparent plate, and the second transparent plate are arranged in the following order: the lens, the first transparent plate, and the second transparent plate.
10. The method as claimed in claim 9 , wherein the transparent material is interposed between the first transparent plate and the second transparent plate in the produced image pickup device.
11. The method as claimed in claim 9 , wherein the transparent material is a resin.