Optical element, image sensor package, imaging device and electronic device
An optical element includes: a base; and an uneven structure layer that is disposed on at least one face of the base, and suppresses reflectance, the optical element having a reflectance of 1% or smaller, in a wavelength region of 400 nm or longer and 700 nm or shorter, a transmittance of 90% or larger, in a wavelength region of 470 nm or longer and 550 nm or shorter, and a variation of transmittance of 1% or smaller, between before and after a high-temperature environmental test conducted at 150° C. for 250 h.
1. An optical element comprising:
a base; and
an uneven structure layer that is disposed on one face of the base, and suppresses reflectance,
the optical element having
a reflectance of 1% or smaller, in a wavelength region of 400 nm or longer and 700 nm or shorter,
a transmittance of 90% or larger, in a wavelength region of 470 nm or longer and 550 nm or shorter, and
a variation of transmittance of 1% or smaller, between before and after a high-temperature environmental test conducted at 150° C. for 250 h.
2. The optical element according to claim 1 , having a variation of transmittance of 1% or smaller, between before and after a high-temperature environmental test conducted at 150° C. for 1000 h.
3. The optical element according to claim 1 , having a variation of transmittance of 1% or smaller, between before and after a heat resistance test conducted at 245° C. for 5 min.
4. An optical element comprising:
a base; and
an uneven structure layer that is disposed on one face of the base, and suppresses reflectance,
the optical element having
a reflectance of 1% or smaller, in a wavelength region of 400 nm or longer and 700 nm or shorter,
a transmittance of 90% or larger, in a wavelength region of 420 nm or longer and 600 nm or shorter, and
a variation of transmittance of 1% or smaller, between before and after a high-temperature environmental test conducted at 150° C. for 250 h.
5. The optical element according to claim 1 ,
wherein the uneven structure layer contains an organic resin, and
the base contains at least one of glass, crystallized glass, or crystal.
6. The optical element according to claim 5 ,
wherein the organic resin is a cured article of a UV curable resin composition.
7. The optical element according to claim 6 ,
wherein the UV curable resin composition is at least one of a first composition that contains a first compound having vinyl group and a second compound having (meth)acryloyl group; or a second composition that contains a third compound having vinyl group and (meth)acryloyl group.
8. The optical element according to claim 6 ,
wherein the UV curable resin composition is of solventless type.
9. The optical element according to claim 1 ,
wherein the uneven structure layer contains a plurality of structures, and
each structure has an aspect ratio of 1 or larger.
10. The optical element according to claim 1 , further comprising a multilayered film that is disposed on the other face of the base, and suppresses reflectance.
11. The optical element according to claim 1 , further comprising a multilayered film that is disposed on the other face of the base, and has a function for cutting light in a specified wavelength region.
12. The optical element according to claim 1 , further comprising an uneven structure layer that is disposed on the other face of the base, and suppresses reflectance.
13. The optical element according to claim 1 ,
wherein the uneven structure layer contains a light absorber.
14. The optical element according to claim 13 ,
wherein the light absorber contains phthalocyanine-nickel complex.
15. The optical element according to claim 1 , having a silane coupling agent applied between the base and the uneven structure layer.
16. The optical element according to claim 1 ,
wherein adhesiveness between the base and the uneven structure layer is denoted by any one of classifications 0 to 2, in a cross-cut test in compliance with JIS K5600-5-6.
17. The optical element according to claim 1 , being intended for an image sensor package.
18. An image sensor package comprising:
a package including the optical element according to claim 1 ; and
an image sensor housed in the package.
19. The image sensor package according to claim 18 ,
wherein the uneven structure layer is opposed to the image sensor.
20. The image sensor package according to claim 18 , further comprising a multilayered film that is disposed on the other face of the base, and has a function for cutting light in a specified wavelength region,
wherein the uneven structure layer contains a light absorber.
21. The image sensor package according to claim 20 ,
wherein the image sensor has, on a surface, a microlens.
22. An imaging device comprising the image sensor package according to claim 18 .
23. An electronic device comprising the image sensor package according to claim 18 .
24. An image sensor package comprising:
a package including the optical element according to claim 4 ; and
an image sensor housed in the package.
25. The image sensor package according to claim 24 ,
wherein the uneven structure layer is opposed to the image sensor.
26. The image sensor package according to claim 24 , further comprising a multilayered film that is disposed on the other face of the base, and has a function for cutting light in a specified wavelength region,
wherein the uneven structure layer contains a light absorber.
27. The image sensor package according to claim 26 ,
wherein the image sensor has, on a surface, a microlens.
28. An imaging device comprising the image sensor package according to claim 24 .
29. An electronic device comprising the image sensor package according to claim 24 .