Granted Patent B2

US 12,282,139 · App. 18/701,419 · Granted Apr 22, 2025

Inventor: Naoki Sakazume (Tokyo, JP)

Assignee: SOMAR CORPORATION

G02B1/113G01S7/4813

Abstract

Claims (43)

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 (d 1 ) of 0.05 μm or more and 0.4 μm or less;

(B2) is inorganic-type large particles having a particle diameter (d 2 ) 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.

2. The distance measuring device according to claim 1 , wherein (B1) comprises carbon black.

3. The distance measuring device according to claim 2 , wherein an outermost surface of a plane formed with the membrane has glossiness of less than 4% against an incident light with an incident angle of 85°, reflectance of 6% or less against a light having a wavelength of 905 nm, and an optical density of 1.5 or more.

4. The distance measuring device according to claim 3 , wherein, on the outermost surface of the plane formed with the membrane, a maximum height Rz based on JIS B0601: 2001 is 7 μm or more, an average length Rsm of contour curve elements is 80 μm or more, a skewness Rsk of a contour curve is 0.3 or less, and Kurtosis Rku of a contour curve is 3 or more.

5. The distance measuring device according to claim 2 , wherein the light emitting element and light receiving element are a part of at least one selected from a group composed of a LIDAR sensor unit, ToF camera unit and a millimeter radar unit.

6. The distance measuring device according to claim 1 , wherein an outermost surface of a plane formed with the membrane has glossiness of less than 4% against an incident light with an incident angle of 85°, reflectance of 6% or less against a light having a wavelength of 905 nm, and an optical density of 1.5 or more.

7. The distance measuring device according to claim 6 , wherein, on the outermost surface of the plane formed with the membrane, a maximum height Rz based on JIS B0601: 2001 is 7 μm or more, an average length Rsm of contour curve elements is 80 μm or more, a skewness Rsk of a contour curve is 0.3 or less, and Kurtosis Rku of a contour curve is 3 or more.

8. The distance measuring device according to claim 1 , wherein the light emitting element and light receiving element are a part of at least one selected from a group composed of a LIDAR sensor unit, ToF camera unit and a millimeter radar unit.

9. An electronic apparatus, comprising the distance measuring device according to claim 1 .

10. A mobile body comprising the distance measuring device according to claim 1 .

11. The distance measuring device according to claim 1 , wherein (B) is the inorganic-type particles.

12. The distance measuring device according to claim 11 , wherein (B) consists of (B1) and (B2) and the total amount of (B1) and (B2) in 100% by mass of (B) is 100% by mass.

13. The distance measuring device according to claim 1 , wherein (B) is the mixture of resin-type particles and inorganic-type particles.

14. An antireflection film, formed at least on a translucent cover of a distance measuring device comprising the translucent cover, which covers a light emitting element for emitting a detection light for measuring a distance to an object and a light receiving element for outputting a light-receiving signal in accordance with an amount of an incident light, and

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:

wherein

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 (d 1 ) of 0.05 μm or more and 0.4 μm or less;

(B2) is inorganic-type large particles having a particle diameter (d 2 ) 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.

15. The antireflection film according to claim 14 , wherein (B) is the inorganic-type particles.

16. The antireflection film according to claim 15 , wherein (B) consists of (B1) and (B2) and the total amount of (B1) and (B2) in 100% by mass of (B) is 100% by mass.

17. The antireflection film according to claim 14 , wherein (B) is the mixture of resin-type particles and inorganic-type particles.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (30)