Electric lamp and discharge devices: systems – Special application – Vehicle
Patent
1987-05-08
1987-12-15
Dixon, Harold
Electric lamp and discharge devices: systems
Special application
Vehicle
15250A, 307 10LS, 315 77, B60Q 102
Patent
active
047135832
ABSTRACT:
A vehicle headlamp cleaning assembly and method for use in a vehicle includes cleaning means (27) which are energized when the headlamps (10) collect residue. The headlamp (10) includes a transparent lens (12), a light source (14) and a housing (16) with a reflective interior surface (18). The assembly includes sensing means (20) within the housing (16) which sense the light source radiation generated by the light source (14) sensed by a first sensor (22) and the backscattered light radiation reflected off residue on the exterior surface of the lens (12) sensed by a second sensor (24). A control circuit (26) compares the light source radiation and the backscattered light radiation. When the amount of backscattered light radiation has exceeded a predetermined magnitude, the cleaning means (27) is actuated. The control circuit (26) includes a time delay means (30) which prevents the actuation of the cleaning means (27) until the predetermined magnitude of backscattered light radiation has existed for the time delay to prevent erratic operation and sensitivity to transient artifacts. The method of cleaning the headlamp (10) therefore includes the steps of sensing the amount of backscattered light radiation reflected from residue collected on the exterior of transparent lens (12) which decreases the light generated by the light source (14) and leaving the transparent lens (12). The cleaning means (27) is actuated in response to the amount of backscattered light exceeding a predetermined magnitude.
REFERENCES:
patent: 3058142 (1962-10-01), Pollock
patent: 3609450 (1971-09-01), Hart
patent: 3963969 (1967-06-01), Nottingham
Dixon Harold
Milton Jr. Harold W.
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