Vehicle headlight with a dirt sensor

Details Vehicle headlight with a dirt sensor Vehicle headlight with a dirt sensor

1979-04-23

1980-09-23

Smith, Alfred E.

Electric lamp and discharge devices

Combined

362 61, 362253, 356342, F21V 3300, B60Q 1100

Patent

active

042245516

ABSTRACT:
A vehicle headlight is disclosed comprising a dirt sensor for sensing dirt on a diffuser disk of the headlight. The dirt sensor receives the light of a lamp of the headlight scattered back due to dirt on the diffuser disk and is shielded against the light emanating directly from the lamp and emanating indirectly via a reflector. The dirt sensor of the headlight is arranged at a point outside of the reflector to which the scattered-back light passes via reflection on the reflector whereby changes to the reflector for accommodating the dirt sensor and the concomitant reduction of the effective surface area of the reflector are avoided.

REFERENCES:
patent: 3609450 (1969-09-01), Hart

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