DE3430273A1 - HEADLIGHTS FOR LOW BEAM OR FOG LIGHTS OF MOTOR VEHICLES - Google Patents

Description

8.8.3981+ Hk / Kc

ROBERT BOSCH GMBH, 7000 Stuttgart 1

Headlights for dipped headlights or fog lights for motor vehicles

State of the art

The invention relates to a headlight for low beam or lever lights of motor vehicles according to the category of claim 1. The light-dark boundary that is created by the image of the diaphragm edge has one through the Color separation of the white light formed on the color fringing. A low beam or fog light with one of these However, the color fringing does not comply with the legal requirements on motor vehicle headlights, because this is only white Light is allowed .; this could be done with a three-part Objectively realize that two converging lenses and one diverging lens with spherically ground lens surfaces having. The three-part nature of the lens and the total of six ground lens surfaces require however, a large technical manufacturing effort for the headlight. ·

Advantages of the invention

With the headlight for low beam or lever light from Motor vehicles according to the invention is in the aforementioned The prior art problem of the technical manufacturing effort is solved in a simple manner in that the

Lens consists of only two lenses and the required one aspherical lens surface is already created by the molding tool during the pressing process. The two spherical surfaces the diverging lens and the spherical surface of the converging lens can be both pressed and ground, whereby the grinding of any spherical surface, · the part a spherical surface, simply designed,

Advantageously, the pressed aspherical surface of the converging lens can be calculated and manufactured in this way that a too high-contrast light-dark border avoided and a sufficient brightening of the to be illuminated Space is reached j one increases the driving safety of the motor vehicle driver and the other allows the traffic signs to be seen more clearly.

Advantageous developments of the invention are in the Described subclaims.

drawing

An embodiment of the invention is shown in the drawing and explained in more detail in the description of the figures.

Description of the embodiment

A headlamp for a low beam or fog light of motor vehicles having a reflector 10 whose vertical meridian section 11 and horizontal meridian section are 12 higher order section curves such as ellipses, parabolas or conic similar curves, a light-emitting body 13 is in the optical axis Ik of the headlamp disposed, and in Direction of the reflected beams from the reflector 10, ie in front of the light exit opening J5 of the

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Reflector 10 "is a screen 16, the optical effective edge 17 the light-dark boundary of the light beam ' forms.

Also in the direction of the reflected light rays and An objective formed by a diffusing lens 18 and a collecting lens 19 is arranged in front of the diaphragm 16. The divergent lens 18 has a flat surface 20 and a spherical surface 21 which is part of a spherical surface. Both surfaces 20,

21 were created by grinding a pressed blank. The converging lens 19 consists of pressed glass, the aspherical Surface 23 is already fully pressed, so does not require any subsequent grinding process; their spherical surface

22, however, is sanded. The concave surface 21 of the Diverging lens 18 and the convex surface 22 of the collecting lens 19 are arranged adjacent.

It is essential to the invention that the aspherical surface 23 of the objective (18, 19) is completely pressed and therefore no longer requires a complex technical grinding process · all Flat surfaces and / or spherical surfaces can both be finished pressed or ground, the relevant The grinding process can be represented in a technically simple manner.

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Claims (6)

y λ λ 343 0 27ο i | η r \ H R,: i V? «J U U 8.8. 398U Hk / Kc ROBERT BOSCH GMBH, 7000 Stuttgart Expectations (y. Headlights for dipped headlights or fog lights of motor vehicles, with a reflector whose vertical and horizontal meridional section are curves of a higher order and which reflects the rays generated by a luminous element, and with a diaphragm arranged in the direction of the reflected rays, whose optically effective Edge forms the light-dark boundary of the bundle of light, and with an objective arranged in the direction of the rays in front of the diaphragm, which forms the reflected rays into a bundle of light, characterized in that a spherical divergent lens (18) and an aspherical converging lens (19) form the objective and that at least the aspherical surface (23) of the converging lens (-19) is finished pressed and not ground. 2. Headlight according to claim J, characterized in that that the other surface (22) of the converging lens (19) is ground. , ι 3. Headlight according to claim J or 2, characterized in that the two surfaces (2J, 22) of the divergent lens (.18) are finished pressed and not ground. J U. Headlight according to claim 1 or 2, characterized in that that at least one of the two surfaces (20, 21) of the divergent lens (18) is ground. 5. Headlight according to one of the preceding claims,
characterized in that the divergent lens (18) from
Plastic consists, 6. Headlight according to one of the preceding claims,
characterized in that the objective (18, 19), ' ^: in particular the aspherical surface (23) of the converging lens (19)' is calculated in such a way that the diaphragm (16) depicting the Hall-dark boundary is out of focus and the area above the light-dark boundary is brightened is. L.