Single use camera with flash charging circuit
US5761541A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1997 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Mar 27, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2219/045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A single use camera having an electronic flash assembly including a flash charging circuit and a flash illumination circuit is provided with one or more access openings in the camera cover. The access openings are aligned with contact terminals in the flash charging circuit to allow insertion of a shorting device that acts to disable operation of the flash charging circuit. This is useful during a film loading operation to prevent charging of the flash capacitor which might otherwise be caused by electrostatic start up of the flash charging circuit. Preventing operation of the flash charging circuit in preference to shorting of the flash capacitor directly preserves battery power and assures the flash charging transistors will not be damaged by attempting to charge into a short circuited flash capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.