US 12,242,092 B2
Optical filter and imaging device
Motoshi Nakayama, Fukushima (JP); Kazuhiko Shiono, Fukushima (JP); and Ryo Hirano, Tokyo (JP)
Assigned to AGC Inc., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on May 25, 2022, as Appl. No. 17/804,007.
Application 17/804,007 is a continuation of application No. PCT/JP2020/044361, filed on Nov. 27, 2020.
Claims priority of application No. 2019-223748 (JP), filed on Dec. 11, 2019.
Prior Publication US 2022/0291433 A1, Sep. 15, 2022
Int. Cl. G02F 1/1333 (2006.01); G02B 1/04 (2006.01); G02B 5/00 (2006.01); G02B 5/28 (2006.01); G02F 1/1335 (2006.01); G02F 3/00 (2006.01); G02B 1/14 (2015.01)
CPC G02B 5/285 (2013.01) [G02B 1/04 (2013.01); G02B 5/282 (2013.01); G02B 1/14 (2015.01); G02F 1/133345 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An optical filter comprising:
a resin base material comprises an infrared-absorbing pigment layer; and
a pair of inorganic dielectric layers which are respectively disposed on or above both main surfaces of the resin base material as outermost layers,
wherein at least one of the pair of inorganic dielectric layers satisfies at least one of:
a condition in which a film thickness is 4 μm or greater, and
a condition in which the number of layers is 30 or greater, and
wherein a ratio of a total film thickness of the pair of inorganic dielectric layers to a film thickness of the resin base material is greater than 8%.