Imaging device and mobile information terminal
View Patent ↗An imaging device with a short length and small aberration is provided. A total length D of an image-forming optical system is less than 3.6 mm. A maximum incidence angle of a principle ray on an image forming plane exceeds 33°. Conditions f/fL<−1.50 or f/fL<−0.9, and D/f<1.10 are satisfied where f denotes a focal length of the entire image-forming optical system and fL denotes a focal length of a last lens.
1. An imaging device comprising:
an image-forming optical system composed of two or more lenses; and
a solid state image sensor for capturing an image formed on an image forming plane of the image-forming optical system;
wherein, a total length of the image-forming optical system is less than 3.6 mm, and a maximum incidence angle of a principal ray incident on the image forming plane exceeds 33°.
2. The imaging device of claim 1 , wherein f/fL<−1.50 is satisfied where f denotes a focal length of the entire image-forming optical system and fL denotes a focal length of a last lens.
3. The imaging device of claim 1 , wherein sensitivity of the solid state image sensor is greater than or equal to 20% when light is incident on its incident surface at incidence angles of ±30°, relative to sensitivity to normal incident light, and the incident surface is determined by the image forming plane of the image-forming optical system.
4. The imaging device of claim 3 , wherein the solid state imaging device is sensitive in visible light range and non-sensitive in an IR range.
5. The imaging device of claim 1 , wherein a photoelectric conversion portion is composed of an organic photoelectric conversion layer.
6. The imaging device of claim 1 , wherein the solid state image sensor is of a back side illumination type.
7. The imaging device of claim 1 , wherein the image-forming optical system does not include an IR cut filter.
8. A mobile information terminal having the imaging device of claim 1 .
9. The imaging device of claim 1 , wherein the maximum incidence angle of the principal ray incident on the image forming plane exceeds 45°.
10. The imaging device of claim 1 , wherein the total length is about 3.3 mm.
11. The imaging device of claim 1 , wherein the total length is about 3.3 mm.
12. An imaging device comprising:
an image-forming optical system composed of two or more lenses; and
a solid state image sensor for capturing an image formed on an image forming plane of the image-forming optical system;
wherein, a total length D of the image-forming optical system is less than 3.6 mm, and D/f<1.10 is satisfied where f denotes a focal length of the entire image-forming optical system.
13. The imaging device of claim 12 , wherein f/fL<−0.90 is satisfied where fL denotes a focal length of a last lens.
14. The imaging device of claim 13 , wherein the image-forming optical system is composed of three lenses including the last lens being a negative lens.
15. The imaging device of claim 12 , wherein f/fL<−1.50 is satisfied where fL denotes a focal length of a last lens.
16. The imaging device of claim 15 , wherein the image-forming optical system is composed of four lenses including the last lens being a negative lens.
17. The imaging device of claim 12 , wherein the total length D is 3.5 mm.
18. An imaging device comprising:
an image-forming optical system composed of two or more lenses; and
a solid state image sensor for capturing an image formed on an image forming plane of the image-forming optical system;
wherein, f/fL<−1.5 and D/f<1.10 are satisfied where D denotes a total length of the image-forming optical system, and f denotes a focal length of the entire image-forming optical system, and fL denotes a focal length of a last lens.