Apparatus for adjusting the light projecting angle of vehicle headlamps
First Claim
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1. An apparatus for adjusting a light projecting angle of a vehicle headlamp comprising:
- means for supplying a st voltage comprising resistor means and switching means coupled to said resistor means, wherein division voltage points of said resistor means are selectable by said switching means one at a time to provide a first division voltage as said set voltage when a supply voltage is applied across said resistor means; and
a drive unit comprising;
reference voltage setting means for setting a reference voltage to a second division voltage provided by reference resistor means across which said supply voltage is applied;
voltage comparison means for comparing said reference voltage and said set voltage provided by said means for supplying voltages;
means for generating an output signal according to the output of said voltage comparison means; and
means for adjusting said light projecting angle to a value which is determined from said output signal formed by said means for generating an output signal.
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Abstract
A light projecting angle adjusting apparatus for a vehicle headlamp, where the division voltage points of a resistor device, across which a supply voltage is applied, are selected one at a time, to provide different division voltages as set voltages. A division voltage provided by a reference resistor device across which the supply voltage is applied is defined as a reference voltage which is compared with the selected set voltage. An output signal is generated according to the result of comparison and the light projecting angle of the headlamp is adjusted to a value which is determined from the output signal.
20 Citations
59 Claims
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1. An apparatus for adjusting a light projecting angle of a vehicle headlamp comprising:
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means for supplying a st voltage comprising resistor means and switching means coupled to said resistor means, wherein division voltage points of said resistor means are selectable by said switching means one at a time to provide a first division voltage as said set voltage when a supply voltage is applied across said resistor means; and a drive unit comprising; reference voltage setting means for setting a reference voltage to a second division voltage provided by reference resistor means across which said supply voltage is applied; voltage comparison means for comparing said reference voltage and said set voltage provided by said means for supplying voltages; means for generating an output signal according to the output of said voltage comparison means; and means for adjusting said light projecting angle to a value which is determined from said output signal formed by said means for generating an output signal. - View Dependent Claims (3, 5, 7, 8, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 54, 56, 58)
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2. An apparatus for adjusting a light projecting angle of a vehicle headlamp comprising:
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means for supplying st voltages, wherein connecting points of first resistor means are selectively connected one at a time to second resistor means disposed in a drive unit, said second resistor means being connected in series, through said first resistor means, to a supply voltage source, wherein the series connection resistance of said first resistor means is varied in accordance with said connecting points, so as to provide a first division voltage as a set voltage, at the connecting point of said first and second resistor means; and a drive unit comprising; reference voltage setting means for setting as a reference voltage a second division voltage provided by reference resistor means across which said supply voltage is applied; voltage comparison means for comparing said reference voltage and said set voltages provided by said means for supplying set voltages; means for generating an output signal according to the output of said voltage comparison means; and means for adjusting said light projecting angle to a value which is determined from said output signal formed by said means for generating an output signal. - View Dependent Claims (4, 6, 9, 10, 11, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 55, 57, 59)
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Specification