Light detector having light sensor and light indicator, and...

Details Light detector having light sensor and light indicator, and... Light detector having light sensor and light indicator, and...

G - Physics

01

J

340/155

G01J 1/02 (2006.01) B60Q 1/14 (2006.01) H05B 37/02 (2006.01)

Patent

CA 1303181

A light detector which indicates decrease in the level of ambient light below a prescribed value. The light detector includes a light indicator for radiating light when the level of ambient light decreases below the prescribed value, a light sensor arranged parallel to the light indicator for receiving actual light including ambient light and light from the light indicator for outputting a detection signal corresponding to a level of actual light, and a control circuit for evading effect of the light from the light indicator for controlling the operation of the light indicator while ambient light is below the prescribed level even though the actual light received by the light sensor increases above the prescribed level.

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