Imaging device including an optical member having a water-repellent or water/oil-repellent coating, an antireflection coating, an infrared-cutting glass, and a lowpass filter in this order from the side of the lens
View Patent ↗An imaging apparatus comprising an optical member in an optical path from a lens to an imaging device, said optical member comprising a water-repellent or water/oil-repellent coating, a first antireflection coating, an infrared-cutting glass, a lowpass filter, and an infrared-cutting coating in this order from the side of said lens.
1. An imaging apparatus having an optical member in an optical path from a lens to an imaging device, said optical member comprising a water-repellent or water/oil-repellent coating, an antireflection coating, an infrared-cutting glass, and a lowpass filter in this order from the side of said lens.
2. The imaging apparatus according to claim 1 , wherein said optical member comprises another antireflection coating on a surface of said lowpass filter on the imaging device side.
3. The imaging apparatus according to claim 1 , wherein said optical member further comprises a water-repellent or water/oil-repellent coating on a surface on the side of said imaging device.
4. The imaging apparatus according to claim 1 , wherein said optical member further comprises an infrared-cutting coating on a surface of said lowpass filter on the imaging device side.
5. The imaging apparatus according to claim 1 , wherein said water-repellent or water/oil-repellent coating contains fluorine.
6. The imaging apparatus according to claim 1 , wherein said water-repellent or water/oil-repellent coating is as thick as 0.4-100 nm.
7. The imaging apparatus according to claim 1 , wherein an outermost layer of said antireflection coating in contact with said water-repellent or water/oil-repellent coating is made of silicon dioxide.
8. The imaging apparatus according to claim 1 , wherein said optical member comprises a low-surface-resistivity coating made of conductive or semi-conductive metal oxide between said water-repellent or water/oil-repellent coating and said infrared-cutting glass.
9. The imaging apparatus according to claim 8 , wherein said metal oxide is at least one selected from the group consisting of antimony oxide, indium tin oxide and antimony tin oxide.
10. The imaging apparatus according to claim 8 , wherein a surface of said optical member on the lens side had surface resistivity of 1×10 4 to 1×10 13 Ω/square.
11. The imaging apparatus according to claim 1 , wherein said optical member comprises a first low-surface-resistivity coating made of a conductive or semi-conductive metal oxide between said water-repellent or water/oil-repellent coating and said infrared-cutting glass, and a second low-surface-resistivity coating made of a conductive or semi-conductive metal oxide between said lowpass filter and an imaging-device-side surface.
12. The imaging apparatus according to claim 11 , wherein both surfaces of said optical member have surface resistivity of 1×10 4 to 1×10 13 Ω/square.
13. The imaging apparatus according to claim 11 , wherein said metal oxide is at least one selected from the group consisting of antimony oxide, indium tin oxide and antimony tin oxide.