US 12,282,139 B2
Distance measuring device
Naoki Sakazume, Tokyo (JP)
Assigned to SOMAR CORPORATION, Tokyo (JP)
Appl. No. 18/701,419
Filed by SOMAR CORPORATION, Tokyo (JP)
PCT Filed Dec. 15, 2022, PCT No. PCT/JP2022/046224
§ 371(c)(1), (2) Date Apr. 15, 2024,
PCT Pub. No. WO2023/112990, PCT Pub. Date Jun. 22, 2023.
Claims priority of application No. 2021-204760 (JP), filed on Dec. 17, 2021.
Prior Publication US 2024/0329278 A1, Oct. 3, 2024
Int. Cl. G02B 1/113 (2015.01); G01S 7/481 (2006.01)
CPC G02B 1/113 (2013.01) [G01S 7/4813 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A distance measuring device, comprising
a light emitting element for emitting a detection light for measuring a distance to an object;
a light receiving element for outputting a light-receiving signal in accordance with an amount of an incident light; and
a translucent cover for covering the light emitting element and light receiving element,
wherein:
the translucent cover has an antireflection film at least on one main surface side;
the antireflection film is configured by a membrane having a thickness of 2 μm or more and 40 μm or less formed from a liquid composition by spray coating;
the liquid composition comprises at least (A), (B) and (C);
(A) is a resin component;
(B) is inorganic-type particles or a mixture of resin-type particles and inorganic-type particles;
(B) is contained in an amount of 20% by mass or more and 60% by mass or less in a total amount of 100% by mass of all solid content in the liquid composition;
(B) comprises (B1) and (B2), wherein a total amount of (B1) and (B2) in 100% by mass of (B) is 90% by mass or more, and a mass ratio of (B2) with respect to (B1) is 1.8 or more and 3.3 or less;
(B1) is inorganic-type small particles having a particle diameter (d1) of 0.05 μm or more and 0.4 μm or less;
(B2) is inorganic-type large particles having a particle diameter (d2) of 3 μm or more and 6 μm or less;
(B2) comprises silica, the silica comprises complex silica obtained by blackening silica with a colorant; and
(C) is a diluent solvent.