Lenses for electronic imaging systems having long wavelength filtering properties
US6411444B1 · kind B1 · utility
85Cited by
6References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1999 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Jun 29, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Lenses for use with electronic imaging systems, e.g., systems employing CCDs, are provided. The lenses employ at least two lens elements, at least one of which is a dyed plastic lens element whose average percentage transmission for wavelengths between 400 nm and 550 nm is greater than its average percentage transmission for wavelengths between 550 nm and 700 nm. Through the use of such a dyed plastic lens element, the need for a separate spectral response flattening filter is eliminated thus reducing the cost, complexity, size, and weight of the electronic imaging system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.