Photographic strobe apparatus
US4290692A · kind A · utility
6Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1979 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | Jul 6, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2215/0592
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A strobe apparatus for reducing contrast index in photographic copies by employing an illumination pulse of short duration includes a source energizable at both a relatively high level to provide high intensity illumination and at a low level to provide low intensity illumination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.