Flash device
US6061528A · kind A · utility
10Cited by
7References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1998 |
| Grant date | May 9, 2000 |
| Priority date | — |
| Expiry date | Apr 30, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/007
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a flash device of the kind preventing a main capacitor from being overcharged by inhibiting a charging action on the main capacitor when the voltage of the main capacitor reaches a predetermined first level, detecting the voltage of the main capacitor by a voltage reference diode and allowing light emission when the voltage of the main capacitor reaches a second level which is higher than the first level, an element having a negative temperature characteristic is connected in series to the voltage reference diode. The arrangement ensures an apposite operation of the flash device irrespective of temperature variations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.