Optical low-pass filter
US8437084B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2007 |
| Grant date | May 7, 2013 |
| Priority date | — |
| Expiry date | Dec 20, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/672
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
On the light-entering surface side of a base material 10, a coating layer 11 in which a high-refractive layer and a low-refractive layer are sequentially disposed alternately on one on the other is provided for blocking infrared radiation. One of the high-refractive layers is configured by an ITO film 11a so that the conductivity is increased on the surface of the coating layer. Herein, in view of preventing, to a further extent, the attachment of dirt and dust by providing the conductivity to the surface of the coating layer, it is desirable if the outermost high-refractive layer is made of a transparent conductive material. Moreover, it is desirable if the total layer thickness is 140 nm or smaller for the refractive layers formed outside of the high-refractive layer made of the transparent conductive material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.