One-time-use camera with external flash unit
US6351608B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2000 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | Mar 27, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B15/03
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A one-time-use camera with a built-in flash unit and an external flash unit system in which the external flash unit is devoid of a charger circuit and battery power supply. The external flash unit is connected to the camera built-in flash unit's flash capacitor and flash trigger circuit via interconnecting terminals provided on the camera and external flash unit. The external flash unit includes circuit means for disabling camera flash trigger circuit so as to prevent the camera flash emission device from operating. A signal pulse is sent from the camera trigger circuit to an SCR trigger switch in the external flash trigger switch to initiate flash operation in the external flash unit. By virtue of mounting the flash emission device of the external unit farther away from the taking lens than the built-in flash device and disabling the operation of the internal flash unit, red-eye on the subject being photographed is substantially eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.