US 12,111,486 B2
Optical filter and imaging lens unit
Keiichi Mochizuki, Nagano (JP)
Assigned to NITTOH INC., Nagano (JP)
Appl. No. 17/602,731
Filed by Nittoh Inc., Nagano (JP)
PCT Filed Feb. 13, 2020, PCT No. PCT/JP2020/005542
§ 371(c)(1), (2) Date Oct. 8, 2021,
PCT Pub. No. WO2020/208935, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 2019-075347 (JP), filed on Apr. 11, 2019.
Prior Publication US 2022/0171106 A1, Jun. 2, 2022
Int. Cl. G02B 5/20 (2006.01); G02B 5/02 (2006.01); G03B 11/00 (2021.01); G02B 7/00 (2021.01); G02B 7/02 (2021.01)
CPC G02B 5/206 (2013.01) [G02B 5/0242 (2013.01); G02B 5/0294 (2013.01); G02B 7/006 (2013.01); G02B 7/021 (2013.01)] 5 Claims
OG exemplary drawing
 
5. An imaging lens unit comprising:
an imaging lens; and
an optical filter member having a negative power and including an optical filter comprising:
a base material;
a plurality of light scattering particles mixed into the base material, wherein the plurality of light scattering particles contain a plurality of scattering elements which differ from each other in a manner of appearance of “scattered light intensity distribution for respective wavelengths”; and
the imaging lens unit further comprises:
a transparent member made of the same material as the base material of the optical filter, and integrally formed with the optical filter by being connected to a recessed surface of the optical filter, wherein
power of an integral body formed of the optical filter and the transparent member is substantially set to 0 (zero).