Automatic headlamp control system

• US 3,315,122 A
• Filed: 12/31/1963
• Issued: 04/18/1967
• Est. Priority Date: 12/31/1963
• Status: Expired due to Term

• Current Assignee: Brock, Eugene W., Miller, Charles W., Robert K. Schuler
• Original Assignee: Brock, Eugene W., Miller, Charles W., Robert K. Schuler
• Inventors: Schuler, Robert K., Miller, Charles W., Brock, Eugene W.
• Application Number:
  US04/344,800
• Time in Patent Office: 1,204 Days
• US Class Current: 315/83
• CPC Class Codes: B60Q 1/1423 Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
• CPC Class Codes: B60Q 2300/052 Switching delay, i.e. the beam is not switched or changed instantaneously upon occurrence of a condition change
• CPC Class Codes: B60Q 2300/42 oncoming vehicle

Claims

3. IN AN AUTOMATIC HEADLAMP CONTROL SYSTEM FOR A MOTOR VEHICLE, A PHOTOTUBE ASSEMBLY COMPRISING A HOUSING PIVOTALLY MOUNTED IN THE LEFT FRONT FENDER OF SAID VEHICLE, A PHOTOCELL AND A PREAMPLIFIER TUBE MOUNTED IN SAID HOUSING, AN OUTER LENS POSITIONED IN SAID FENDER TO RECEIVE LIGHT FROM A SOURCE, AN INNER LENS ATTACHED TO SAID HOUSING AND ADAPTED TO RECEIVE THE LIGHT PASSING THROUGH THE OUTER LENS AND TO FOCUS THE LIGHT ON SAID PHOTOCELL, A LIGHT TIGHT AND DUST PROOF ENCLOSURE CONNECTED BETWEEN SAID INNER AND OUTER LENSES AND INCLUDING LIGHT BAFFLE MEANS FOR EXCLUDING LIGHT REFLECTED FROM THE ROAD SURFACE IN FRONT OF SAID VEHICLE, A LEVEL ASSEMBLY MOUNTED ON SAID HOUSING FOR VERTICALLY ALIGNING SAID HOUSING, A DIM AND HOLD SENSITIVITY CONTROL ASSEMBLY MOUNTED IN SAID PHOTOTUBE ASSEMBLY AND ELECTRICALLY CONNECTED WITH SAID PREAMPLIFIER TUBE FOR ADJUSTING THE SENSITIVITY THEREOF TO A GIVEN LIGHT INTENSITY IMPINGING SAID PHOTOCELL, A SENSITIVITY TEST BULB MOUNTED IN SAID HOUSING FOR PROVIDING SAID GIVEN LIGHT INTENSITY.