Optical device with absorption gradient and selective spectral filtering and lens assembly and camera fitted with such a device
US6545828B2 · kind B2 · utility
5Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2000 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Apr 19, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical device, for homogenising the lighting in an image plane, defined by a digital optical sensor wherein the optical device is formed of a block made of transparent homogenous filtering material, this block having a substantially uniform absorption coefficient for all the wavelengths of the visible optical spectrum which pass through it, and having a variable thickness suited to a determined absorption profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.