Illumination mode switching circuit for automatic electronic flash
US4395100A · kind A · utility
4Cited by
3References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1982 |
| Grant date | Jul 26, 1983 |
| Priority date | — |
| Expiry date | Jun 16, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2215/05
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illumination mode switching circuit for an automatic electronic flash includes an illumination mode selecting, changeover switch having a first terminal which is utilized to establish an automatic illumination control level, a second terminal which provides a manual illumination control, and a third terminal which enables a full emission of flashlight from a flash discharge tube. An isolation diode is connected between the second and the third terminal. In this manner, any one of the three modes can be selected by operating the changeover switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.