Ambient light detector, laser lighting control device using the

Details Ambient light detector, laser lighting control device using the Ambient light detector, laser lighting control device using the

1994-04-28

1996-02-13

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

235470, H01J 4014

Patent

active

054913306

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.

REFERENCES:
patent: 5023818 (1991-06-01), Wittensoldner et al.
patent: 5059777 (1991-10-01), Wittensoldner et al.
patent: 5180904 (1993-01-01), Shepard et al.

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