Vehicle lamp

Details Vehicle lamp Vehicle lamp

1992-01-09

1994-04-26

Husar, Stephen F.

Illumination

Vehicle steering mechanism or element moves pivoted lamp or...

Tie rod element controlled

362338, B60Q 104

Patent

active

053072464

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a vehicle lamp. More particularly it relates to a vehicle lamp which has a reflector, a light source, a lens plate, an optical element for deflecting light beams reflected from the reflector.
Such a vehicle lamp is known from German Offenlegungsschrift 3,336,178. This vehicle lamp has a reflector in which a light source is inserted and whose light exit opening is covered by a lens plate. On its inner surface pointing towards the reflector, the lens plate has optically active elements in the form of cylindrical lenses. The light beams reflected from the reflector are deflected by the cylindrical lenses in order to produce a light distribution closely approaching a prescribed light distribution. Because of the cross-sectional shape of the cylindrical lenses in the form of a curve of conical section, and of the scattering effect characteristic of the respective curve of conical section, the prescribed light distribution cannot be achieved. The production of a desired symmetrical light distribution is impossible, in particular, in lamps with an inclined and/or swivelled lens plate, the light maximum of the light distribution produced by such lamps rather being laterally displaced.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a vehicle lamp which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a vehicle lamp in which each optical element is formed so that the light beams passing through an element are deflected in each case in the horizontal and/or vertical directions such that beams produce the shape of a prescribed light distribution identical for all elements. has, by contrast, the advantage that owing to the configuration of the optically active elements a prescribed light distribution is exactly produced by the vehicle lamp.
In accordance with a further feature of the present invention each optical element is subdivided into a plurality of subprisms having flat surfaces extending tangentially to an envelope of the inner surface of the element. Each subprism is assigned to produce a region of the light distribution. The surface of the subprism is determined by the amount of light assigned to that region of the light distribution.
In accordance with another feature of the present invention the envelope of each of the optical elements has a convex shape, so that with reference to a horizontal direction a left-hand edge region of the light exit direction of the optical element deflects the light beams into a right-hand edge regionof the light distribution, a central region of the optical element deflects the light beams into a central region of the light distribution, and a right-hand edge region of the optical element deflects the light beams into a left-hand edge region of the light distribution, in a vertical direction an upper edge region of the optical element deflects the light beams into a lower edge region of the light distribution, the central region of the optical element deflects the light beams into the central region of the light distribution, and a lower edge region of an element deflects the light beams into the upper edge region of the light distribution.
In accordance with still another feature of the present invention each element is formed as a concave lens, so that in each case with reference to the horizontal direction the left-hand edge region in the light exit direction of an element deflects the light beams into the left-hand edge region of the light distribution, the central region of the element deflects the light beams into the central region of the light distribution, and the right-hand edge region of an element deflects the light beams into the right-hand edge region of the light distribution. Correspondingly, in the vertical direction the upper edge region of the element deflects the light beams into the upper edge region of the

REFERENCES:
patent: 4545007 (1985-01-01), Nagel

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