Vehicle headlamp system
First Claim
1. A vehicle headlamp system with headlamps, each of which contains a lamp unit within a lamp body for emitting beams forward with a predetermined luminous intensity distribution, comprising;
- vehicle-to-vehicle distance measuring means for measuring the vehicle-to-vehicle distance between a first vehicle and a second preceding vehicle, and variable luminous intensity control means for varying said luminous intensity distribution according to said vehicle-to-vehicle distance when the speed of the first vehicle exceeds a predetermined value, wherein headlamps are provided on the left and right sides of a vehicle, thus forming a pair of headlamps and wherein said vehicle-to-vehicle distance measuring means is contained in the lamp body of a first of the headlamps, and wherein a second of the headlamps includes an auxiliary lamp in a position that corresponds to the position of the vehicle-to-vehicle distance measuring means in the lamp body of the first headlamp.
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Accused Products
Abstract
A vehicle headlamp system with headlamps, each of which contains a lamp unit for emitting beams forward with a predetermined luminous intensity distribution. The system carries out beam emission with a luminous intensity distribution corresponding to the travel conditions of a vehicle. In an implementation, when the speed of one'"'"'s own vehicle exceeds 25 km/h, a low-beam luminous intensity distribution P(L) is varied according to a vehicle-to-vehicle distance in relation to a preceding vehicle. Remote visibility is increased by positioning a cut-off line slightly upward when the vehicle-to-vehicle distance L is long, whereas when the vehicle-to-vehicle distance L is short the cut-off line is lowered slightly in order not to give a glare to the driver of the preceding vehicle. But when the vehicle speed V is 25 km/h or lower, the low-beam luminous intensity distribution P(L) is fixed at a downward position which prevents glare and prevents an unpleasant feeling that something is wrong from being given to the driver of the preceding vehicle resulting from the change of the low-beam luminous intensity distribution P(L).
19 Citations
9 Claims
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1. A vehicle headlamp system with headlamps, each of which contains a lamp unit within a lamp body for emitting beams forward with a predetermined luminous intensity distribution, comprising;
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vehicle-to-vehicle distance measuring means for measuring the vehicle-to-vehicle distance between a first vehicle and a second preceding vehicle, and variable luminous intensity control means for varying said luminous intensity distribution according to said vehicle-to-vehicle distance when the speed of the first vehicle exceeds a predetermined value, wherein headlamps are provided on the left and right sides of a vehicle, thus forming a pair of headlamps and wherein said vehicle-to-vehicle distance measuring means is contained in the lamp body of a first of the headlamps, and wherein a second of the headlamps includes an auxiliary lamp in a position that corresponds to the position of the vehicle-to-vehicle distance measuring means in the lamp body of the first headlamp. - View Dependent Claims (2, 3, 4, 5)
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6. A method for operating a vehicle headlamp system comprising:
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measuring the distance between a first vehicle and a second preceding vehicle with a distance measuring means associated with a headlamp of the first vehicle;
varying a luminous intensity distribution of each headlamp of the headlamp system according to the distance between the first and second vehicles when the speed of the first vehicle exceeds a predetermined value; and
illuminating a shoulder of a road with an auxiliary lamp associated with a second headlamp of the headlamp system. - View Dependent Claims (7, 8, 9)
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Specification