Ambient light filter

Details Ambient light filter Ambient light filter

1997-11-18

1999-02-23

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502221, 25023113, 34087002, H01J 4014, G01R 100

Patent

active

058747311

ABSTRACT:
An ambient light filter includes light emitting circuitry and optical detection circuitry. The detection circuitry is positioned to detect light from the emitting circuitry. A microprocessor is provided to separately control the light emitting circuitry and the optical detection circuitry. The microprocessor determines whether light from the emitting circuitry has been detected by removing a measured component equivalent to the ambient light present at the optical detection circuitry.

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