Method for controlling the on/off function of an LED in a scanner
US7656563B2 · kind B2 · utility
3Cited by
8References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2004 |
| Grant date | Feb 2, 2010 |
| Priority date | — |
| Expiry date | Feb 16, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/484
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for controlling ON/OFF of LED in a scanner which replaces CCFL with LED as a light source is provided so as to solve the problem of excessively long warm-up time of CCFL in the prior art. Meanwhile, to achieve intermittent heat dissipation, LED is switched ON/OFF according to the frequency of the scanner receiving optical signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.