Optical device case and optical device
View Patent ↗An optical device case ( 100 A) of an embodiment includes: a light-transmitting window member ( 20 A); and a housing ( 10 ) which has a space for accommodating a light-receiving element and/or a light-emitting element (OE), wherein the window member ( 20 A) includes a light-transmitting member ( 22 ), a polymer film ( 50 ) provided on an outer surface of the light-transmitting member ( 22 ), the polymer film ( 50 ) having a moth-eye structure at its surface, a contact angle of the surface with respect to water being not less than 140°, and a resistance heater ( 24 ) provided on an inner surface of the light-transmitting member ( 22 ).
1. An optical device case comprising:
a light-transmitting window member; and
a housing which has a space for accommodating a light-receiving element and/or a light-emitting element, wherein
the window member includes a light-transmitting member, a polymer film provided on an outer surface of the light-transmitting member, the polymer film having a moth-eye structure at its surface, a contact angle of the surface with respect to water being not less than 140°, and a resistance heater provided on an inner surface of the light-transmitting member,
a hydrophilic layer is provided on an inner side of the resistance heater,
a contact angle of a surface of the hydrophilic layer with respect to water is not more than 20°,
the resistance heater includes a transparent conductive layer formed on the inner surface of the light-transmitting member,
the hydrophilic layer includes a porous alumina layer provided on the transparent conductive layer,
the porous alumina layer has an inverted moth-eye structure at its surface,
the transparent conductive layer includes an indium-doped tin oxide (ITO) layer, and
the window member further includes an antimony-doped tin oxide (ATO) layer and/or a fluorine-doped tin oxide (FTO) layer between the indium-doped tin oxide (ITO) layer and the porous alumina layer.
2. The optical device case of claim 1 , wherein the hydrophilic layer includes a polymer layer which has a moth-eye structure at its surface.
3. The optical device case of claim 1 , wherein the porous alumina layer contains Ti.
4. A lamp for a signal light, comprising:
the optical device case as set forth in claim 1 ; and
an LED element provided inside the optical device case.
5. A camera comprising:
the optical device case as set forth in claim 1 ; and
an image sensor provided inside the optical device case.
6. An optical detection device comprising:
the optical device case as set forth in claim 1 ; and
a photosensor provided inside the optical device case.
7. The optical device case of claim 1 , wherein the surface of the porous alumina layer does not include a plurality of recessed portions having a greater average value of a two-dimensional size when viewed in a direction normal to the surface of the porous alumina layer than an average value of a two-dimensional size of a plurality recessed portions that defines the inverted moth-eye structure when viewed in the direction normal to the surface of the porous alumina layer.
8. An optical device case comprising:
a light-transmitting window member; and
a housing which has a space for accommodating a light-receiving element and/or a light-emitting element, wherein
the window member includes a light-transmitting member, a polymer film provided on an outer surface of the light-transmitting member, the polymer film having a moth-eye structure at its surface, a contact angle of the surface with respect to water being not less than 140°, and a resistance heater provided on an inner surface of the light-transmitting member,
a hydrophilic layer is provided on an inner side of the resistance heater,
a contact angle of a surface of the hydrophilic layer with respect to water is not more than 20°,
the hydrophilic layer includes a porous alumina layer,
the porous alumina layer has an inverted moth-eye structure at its surface, and
the surface of the porous alumina layer does not include a plurality of recessed portions having a greater average value of a two-dimensional size when viewed in a direction normal to the surface of the porous alumina layer than an average value of a two-dimensional size of a plurality recessed portions that defines the inverted moth-eye structure when viewed in the direction normal to the surface of the porous alumina layer.
9. The optical device case of claim 8 , wherein the porous alumina layer contains Ti.
10. A lamp for a signal light, comprising:
the optical device case as set forth in claim 8 ; and
an LED element provided inside the optical device case.
11. A camera comprising:
the optical device case as set forth in claim 8 ; and
an image sensor provided inside the optical device case.
12. An optical detection device comprising:
the optical device case as set forth in claim 8 ; and
a photosensor provided inside the optical device case.