Photoflash detector
US4494852A · kind A · utility
2Cited by
9References
5Claims
0Family size
Inventor
Key dates
| Filing date | May 25, 1983 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | May 25, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A self-contained photodetector for detecting the light flash from a photoflash unit which is supposed to flash when the shutter of a camera opens. The detector has a light-activated SCR for turning on an IC chip timer, which produces an output signal that turns on a transistor and causes a piezoelectric buzzer to produce an audible signal. All these components are powered by a battery which is contained in the same housing with them. This housing has an opening for passing light onto the SCR.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.