Imaging device
The present disclosure relates to an imaging device capable of achieving miniaturization and height reduction of a device configuration and reducing generation of a flare or a ghost. A light shielding film is formed in a region including a side surface portion of a lens formed on a solid-state imaging element. The present disclosure is applicable to an imaging device.
1. An imaging device, comprising:
a solid-state imaging element that generates a pixel signal by photoelectric conversion according to an amount of incident light;
a glass substrate;
a lens group that includes a plurality of lenses and focuses the incident light on a light receiving surface of the solid-state imaging element; and
a light shielding film,
wherein the glass substrate is disposed between the solid-state imaging element and the lens group,
wherein a lowermost layer lens included in the lens group and constituting a lowermost layer with respect to an incident direction of the incident light is provided on a first portion of a first surface of the glass substrate,
wherein the lowermost layer lens is an aspherical and recessed lens, and
wherein the light shielding film is formed on a side surface of the lowermost layer lens and on a second portion of the first surface of the glass substrate.
2. The imaging device according to claim 1 , wherein
an effective region for converging the incident light on the solid-state imaging element is defined in the lowermost layer lens, and
the light shielding film is formed on the side surface of the lowermost layer lens in a region up to a height at which the effective region is defined.
3. The imaging device according to claim 1 , wherein the lowermost layer lens is affixed to the glass substrate.
4. The imaging device according to claim 1 , wherein
an effective region for converging the incident light on the solid-state imaging element is defined in the lowermost layer lens, and
the light shielding film is formed in a region including the side surface of the lowermost layer lens and excluding the effective region.
5. The imaging device according to claim 4 , wherein the light shielding film is so formed as to cover an entire region including the side surface of the lowermost layer lens, excluding the effective region, and extending up to a height of the lowermost layer lens in the incident direction of the incident light.
6. The imaging device according to claim 5 , wherein the light shielding film is formed between a bank provided on an outer peripheral portion of the lowermost layer lens and the side surface of the lowermost layer lens.
7. The imaging device according to claim 6 , wherein the light shielding film is formed by filling, by using lithography, a material of the light shielding film between the bank provided on the outer peripheral portion of the lowermost layer lens and the side surface of the lowermost layer lens.
8. The imaging device according to claim 6 , wherein the light shielding film is formed by applying a material of the light shielding film between the bank provided on the outer peripheral portion of the lowermost layer lens and the side surface of the lowermost layer lens.
9. The imaging device according to claim 6 , wherein the light shielding film is formed by filling, by using lithography, a material of the light shielding film between the bank provided on the outer peripheral portion of the lowermost layer lens and the side surface of the lowermost layer lens, or applying the material, and then polishing the material.
10. The imaging device according to claim 9 , wherein the bank is so formed as to connect with the side surface of the lowermost layer lens.
11. The imaging device according to claim 4 , wherein the light shielding film is formed in a region including the side surface of the lowermost layer lens and excluding the effective region and disposed on a surface at a height of the lowermost layer lens in the incident direction of the incident light.
12. The imaging device according to claim 3 , wherein a protrusion portion that extends from the first surface of the glass substrate is formed adjacent to an outer peripheral side surface of the lowermost layer lens, a thickness of the protrusion portion from the glass substrate being larger than a largest thickness of the lowermost layer lens, and the protrusion portion having a flat surface portion.
13. The imaging device according to claim 1 , wherein an outer peripheral portion of the lowermost layer lens has a multistep side surface.
14. The imaging device according to claim 1 , wherein the solid-state imaging element has a laminated and non-cavity structure.