Spectrally filtered lens producing plural f-numbers with different spectral characteristics
US4687926A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1984 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Dec 20, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/0492
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photoresponsive apparatus is disclosed which includes a photoresponsive device that provides an output or response having a characteristic which varies as a function of the radiant power and wavelength incident on a photoresponsive surface thereof. Included is a spectral filtering means associated with an optical assembly so as to provide the assembly with different f-number zones for each of the respectively different proportionalities of wavelengths such that the spectral composition of incident radiation reaching the surface is controlled by the spectral filtering means to effect a desired change in the response of the photoresponsive device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.