Headlight dimming device
First Claim
1. AN AUTOMATIC LIGHT-SENSITIVE HEADLAMP-DIMMING DEVICE SELECTIVELY RESPONSIVE TO A PULSE OF INCIDENT LIGHT IN CONTRADISTINCTION TO SUBSTANTIALLY STEADY INCIDENT LIGHT AND LIGHT OF SLOWLY CHANGING EFFECTIVE INTENSITY, SAID DEVICE COMPRISING PHOTOELECTRIC CELL MEANS, MEANS ELECTRICALLY CONNECTED WITH SAID PHOTOELECTRIC CELL MEANS PROVIDING A TIME CONSTANT AND CONSTITUTING A DIFFERENTIATING CIRCUIT SELECTIVELY RESPONSIVE TO A VOLTAGE PULSE INTRODUCED FROM SAID PHOTOELECTRIC CELL MEANS AND DERIVING FROM SAID PULSE OF INCIDENT LIGHT, SAID CIRCUIT PROVIDING A RATE OF CHANGE OF VOLTAGE WHICH IS LESS RAPID THAN THAT OF SAID INTRODUCED VOLTAGE AND A VOLTAGE PULSE WHICH APPROXIMATES THE PEAK VALUE THEREOF, ELECTRONIC PHASE SPLITTING MEANS ELECTRICALLY CONNECTED WITH SAID DIFFERENTIATING CIRCUIT AND PRODUCING TWO VOLTAGE PULSES OF OPPOSITE SIGN IN RESPONSE TO EACH VOLTAGE PULSE RECEIVED FROM SAID CIRCUIT, DISCRIMINATING DIODE AND ASSOCIATED NETWORK MEANS ELECTRICALLY CONNECTED WITH SAID PHASE SPLITTING MEANS FOR PROVIDING A SINGLE POSITIVE VOLTAGE PULSE IN RESPONSE TO SAID TWO PULSES OF OPPOSITE SIGN, HEADLAMP MEANS HAVING LIGHT-POLARIZING FILTERS ASSOCIATED THEREWITH, AN ELECTRONIC SWITCHING MEANS ELECTRICALLY CONNECTED WITH SAID NETWORK CIRCUIT MEANS AND RESPONSIVE TO SAID SINGLE POSITIVE VOLTAGE PULSE, SAID ELECTRONIC SWITCHING MEANS, IN TURN PROVIDING ENERGIZATION OF SAID HEADLAMP MEANS.
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Accused Products
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1 Claim
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1. AN AUTOMATIC LIGHT-SENSITIVE HEADLAMP-DIMMING DEVICE SELECTIVELY RESPONSIVE TO A PULSE OF INCIDENT LIGHT IN CONTRADISTINCTION TO SUBSTANTIALLY STEADY INCIDENT LIGHT AND LIGHT OF SLOWLY CHANGING EFFECTIVE INTENSITY, SAID DEVICE COMPRISING PHOTOELECTRIC CELL MEANS, MEANS ELECTRICALLY CONNECTED WITH SAID PHOTOELECTRIC CELL MEANS PROVIDING A TIME CONSTANT AND CONSTITUTING A DIFFERENTIATING CIRCUIT SELECTIVELY RESPONSIVE TO A VOLTAGE PULSE INTRODUCED FROM SAID PHOTOELECTRIC CELL MEANS AND DERIVING FROM SAID PULSE OF INCIDENT LIGHT, SAID CIRCUIT PROVIDING A RATE OF CHANGE OF VOLTAGE WHICH IS LESS RAPID THAN THAT OF SAID INTRODUCED VOLTAGE AND A VOLTAGE PULSE WHICH APPROXIMATES THE PEAK VALUE THEREOF, ELECTRONIC PHASE SPLITTING MEANS ELECTRICALLY CONNECTED WITH SAID DIFFERENTIATING CIRCUIT AND PRODUCING TWO VOLTAGE PULSES OF OPPOSITE SIGN IN RESPONSE TO EACH VOLTAGE PULSE RECEIVED FROM SAID CIRCUIT, DISCRIMINATING DIODE AND ASSOCIATED NETWORK MEANS ELECTRICALLY CONNECTED WITH SAID PHASE SPLITTING MEANS FOR PROVIDING A SINGLE POSITIVE VOLTAGE PULSE IN RESPONSE TO SAID TWO PULSES OF OPPOSITE SIGN, HEADLAMP MEANS HAVING LIGHT-POLARIZING FILTERS ASSOCIATED THEREWITH, AN ELECTRONIC SWITCHING MEANS ELECTRICALLY CONNECTED WITH SAID NETWORK CIRCUIT MEANS AND RESPONSIVE TO SAID SINGLE POSITIVE VOLTAGE PULSE, SAID ELECTRONIC SWITCHING MEANS, IN TURN PROVIDING ENERGIZATION OF SAID HEADLAMP MEANS.
Specification
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- Resources
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Current AssigneeCharles H. Matz, Robert C. Casselman
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Original AssigneeCharles H. Matz, Robert C. Casselman
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InventorsCasselman, Robert C., Matz, Charles H.
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Application NumberUS03/849,971Time in Patent Office1,229 DaysField of SearchUS Class Current315/83CPC Class CodesB60Q 1/1423 Automatic dimming circuits,...B60Q 2300/052 Switching delay, i.e. the b...B60Q 2300/42 oncoming vehicleH05B 39/06 Switching arrangements, e.g...
