Light sensor with diffuser and eye-like response

Details Light sensor with diffuser and eye-like response Light sensor with diffuser and eye-like response

1992-03-25

1993-08-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356218, G01J 350

Patent

active

052351785

ABSTRACT:
A twilight sensor for controlling the headlamps of vehicles employs a photodiode having a predetermined spectral response and a diffuser which also has a predetermined spectral response, the spectral responses being combined to achieve an overall spectral response which corresponds to that of the human eye. With this arrangement, the headlamps of a motor vehicle are turned on and off under different ambient light conditions, in a manner which corresponds to the perception of the driver. In addition, the invention employs a control system which turns the lights on rapidly after the vehicle enters a tunnel.

REFERENCES:
patent: 4417818 (1983-11-01), Weisner
patent: 4687329 (1987-08-01), Schultz
patent: 4827118 (1989-05-01), Shibata et al.
patent: 4968895 (1990-11-01), Leclercq

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