초록 ▼

A vehicle headlamp is constructed with its reflector and front lens adapted to be fixedly mounted in the bodywork of the vehicle, but incorporates a beam deflecting system, in order that the direction of the beam may nonetheless be adjusted. In one form, the beam deflecting system comprises two Fres

A vehicle headlamp is constructed with its reflector and front lens adapted to be fixedly mounted in the bodywork of the vehicle, but incorporates a beam deflecting system, in order that the direction of the beam may nonetheless be adjusted. In one form, the beam deflecting system comprises two Fresnel lenses, mounted face to face in a position to intercept the whole of the headlamp beam, one being equivalent to a diverging lens with cylindrical surfaces, and one being equivalent to a converging lens with cylindrical surfaces. In a neutral position, the effects of the two lenses cancel out, so that no deflection of the beam occurs. One of the lenses is movable in translation away from the neutral position, so that a deflection of the beam occurs, without any other change in the beam pattern. In modified embodiments, the stationary Fresnel lens is not used; instead, its effect is produced by using a reflector of modified shape.

대표청구항 ▼

In a headlamp for an automobile vehicle, which headlamp is adjustable to vary the direction of the beam produced thereby, and comprises a reflector, and at least one light source fixedly mounted within said reflector, whereby light rays emitted by said light source are reflected by said reflector to

In a headlamp for an automobile vehicle, which headlamp is adjustable to vary the direction of the beam produced thereby, and comprises a reflector, and at least one light source fixedly mounted within said reflector, whereby light rays emitted by said light source are reflected by said reflector to form a beam of light, the improvement comprising: providing mountings for fixing said reflector rigidly on a vehicle; providing an optical beam adjusting system comprising at least one generally plate-like transparent optical deflecting element, and means supporting said optical deflecting element in a position to intercept substantially the whole of the said beam formed by said reflector, with said optical deflecting element extending generally perpendicularly to the said beam, and said supporting means permitting an adjustment of the position of said optical deflecting element with at least a component of movement in a direction transverse to the said beam; providing on said optical deflecting element surface configurations of such shapes that those light rays of the said beam which are incident on said beam adjusting system in a given direction emerge from the said beam adjusting system in substantially the same direction as one another, the said direction of emergence being changed by the said adjustment of said optical deflecting element, whereby the direction of the headlamp beam is varied without otherwise substantially affecting the characteristics of the headlamp beam; and providing an actuator mechanism connected to said optical deflecting element, for producing the said adjustment of said optical deflecting element.