US 11,912,899 B2
Film, liquid paint and method
Samuel Kingston, Stuttgart (DE); and Tonino Greco, Stuttgart (DE)
Assigned to Sony Group Corporation, Tokyo (JP)
Filed by Sony Group Corporation, Tokyo (JP)
Filed on Mar. 17, 2022, as Appl. No. 17/696,886.
Claims priority of application No. 21164636 (EP), filed on Mar. 24, 2021.
Prior Publication US 2022/0306873 A1, Sep. 29, 2022
Int. Cl. C09D 5/32 (2006.01); C09D 7/40 (2018.01); C09D 7/62 (2018.01); C09D 163/00 (2006.01); C09C 1/30 (2006.01); C09C 3/08 (2006.01); C08K 9/04 (2006.01)
CPC C09D 5/32 (2013.01) [C09C 1/3063 (2013.01); C09C 3/08 (2013.01); C09D 7/62 (2018.01); C09D 7/67 (2018.01); C09D 163/00 (2013.01); C01P 2004/64 (2013.01); C08K 9/04 (2013.01); C08K 2201/011 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An optical system comprising:
an optical element configured to generate or manipulate visible light; and
a film for absorbing visible light, the film including a plurality of silica nanoparticles,
wherein a surface of at least a part of the plurality of silica nanoparticles is functionalized with a plurality of pigment molecules of a Melanin compound, and the film is at a position relative to the optical element to reduce stray visible light from interfering with visible light output from the optical system,
wherein an average size of each of the plurality of silica nanoparticles is in a wavelength range of the visible light, and
wherein at least a part of pairs of neighboring pigment molecules of the plurality of pigment molecules is cross-linked, wherein the cross-linked is selected from the group consisting of a diamine, a dihydrazide, a borate ion, and a dicarbamate.