Sensor module and protective glass
A sensor module includes: a base member; at least one of a single or a plurality of sensors and vibrators arranged on the base member; and a protective member constituted of at least one flat surface or a curved surface, provided so as to cover the at least one of the sensors and the vibrators. A part or whole of the protective member is formed of a strengthened glass and the strengthened glass is a chemically strengthened glass or a physically strengthened glass.
1. A sensor module comprising:
a base member;
at least one of a single or a plurality of sensors and vibrators arranged on the base member; and
a protective member constituted of at least one flat surface or a curved surface, provided so as to cover the at least one of the sensors and the vibrators,
wherein a part or whole of the protective member is formed of a strengthened glass, wherein
the strengthened glass is a chemically strengthened glass, has a thickness of from 1.5 mm to 3.5 mm, and has a depth of compressive stress layer in a range of from 200 μm to 580 μm,
the chemically strengthened glass has a curved surface shape having a convex surface and a concave surface, and
a value obtained by subtracting a surface compressive stress value of the concave surface from a surface compressive stress value of the convex surface is 10 MPa or more.
2. The sensor module according to claim 1 , wherein the strengthened glass has a surface compressive stress value of 400 MPa or more.
3. The sensor module according to claim 2 , wherein the strengthened glass has the surface compressive stress value of 600 MPa or more.
4. The sensor module according to claim 1 , wherein the chemically strengthened glass has a surface compressive stress value of 700 MPa or more.
5. The sensor module according to claim 1 , wherein the chemically strengthened glass has the depth of the compressive stress layer in a range of from 250 μm to 580 μm, and has a compressive stress value at a depth of 100 μm from a surface of 100 MPa or more.
6. The sensor module according to claim 1 , wherein a value obtained by subtracting a depth of compressive stress layer of the concave surface from a depth of compressive stress layer of the convex surface is 10 μm or more.
7. A sensor module comprising:
a base member;
at least one of a single or a plurality of sensors and vibrators arranged on the base member; and
a protective member constituted of at least one flat surface or a curved surface, provided so as to cover the at least one of the sensors and the vibrators,
wherein a part or whole of the protective member is formed of a strengthened glass, and
the strengthened glass is a chemically strengthened glass, wherein the chemically strengthened glass has at least one bending point in a region forming the compressive stress layer and has a stress distribution curve having a different inclination with the bending point as a boundary.
8. The sensor module according to claim 1 , wherein the vibrator an ultrasonic generating element.
9. The sensor module according to claim 1 , wherein the protective member has a transparent heater.
10. A sensor module comprising:
a base member;
at least one of a single or a plurality of sensors and vibrators arranged on the base member; and
a protective member constituted of at least one flat surface or a curved surface, provided so as to cover the at least one of the sensors and the vibrators,
wherein a part or whole of the protective member is formed of a strengthened glass, and
the strengthened glass is a chemically strengthened glass or a physically strengthened glass,
wherein the strengthened glass has a first main surface and a second main surface facing the first main surface, and has an end surface between the first main surface and the second main surface, and
the end surface has a surface roughness in a range of from 0.01 μm to 1.0 μm.
11. The sensor module according to claim 1 , wherein the strengthened glass is a glass ceramics.
12. The sensor module according to claim 1 , wherein the strengthened glass has a water-repellent film on the surface of the strengthened glass.
13. A protective glass constituted of a flat surface or a curved surface,
wherein a part or whole of the protective glass is a strengthened glass, wherein
the strengthened glass is a chemically strengthened glass, has a thickness of from 1.5 mm to 3.5 mm, and has a depth of compressive stress layer in a range of from 200 μm to 580 μm,
the chemically strengthened glass has a curved surface shape having a convex surface and a concave surface, and
a value obtained by subtracting a surface compressive stress value of the concave surface from a surface compressive stress value of the convex surface is 10 MPa or more.
14. The protective glass according to claim 13 , having an ultrasonic vibrator.
15. The protective glass according to claim 13 , having a transparent heater.