Ambient light detector, laser lighting control device using the same suitable for bar code reader, and bar code reader
US5491330A · kind A · utility
145Cited by
3References
45Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1994 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Apr 28, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/4204
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to an ambient light detector, a laser lighting control device using the same suitable for a bar code reader, and a bar code reader. The object is to require no explanation on a special operation and to realize an easy device design and a low manufacturing cost. Each device includes an ambient light detector to detect light around a peripheral device, and judging device to provide a signal indicating that an ambient light detected by the ambient light detector has exceeded a predetermined value over a predetermined time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.