Optical low pass filter
US5555129A · kind A · utility
56Cited by
13References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1994 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | Apr 26, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/555
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical low pass filter consisting of a diffractive optical element consisting of a plurality of regions which have different imaging characteristics and are joined adjacent to one another so that the imaging characteristics are varied discontinuously. This optical low pass filter is to be used for optical instruments using solid-state image pickup devices and so on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.