CN215294790U

CN215294790U - Optical body for a motor vehicle headlight

Info

Publication number: CN215294790U
Application number: CN202022924949.4U
Authority: CN
Inventors: C·迈尔
Original assignee: ZKW Group GmbH
Current assignee: ZKW Group GmbH
Priority date: 2019-12-09
Filing date: 2020-12-09
Publication date: 2021-12-24
Anticipated expiration: 2030-12-09
Also published as: EP3835650A1; DE202020106901U1

Abstract

The utility model relates to an optics body for motor vehicle headlamps, this optics body includes the following: at least one optically active surface which is designed to reflect incident light rays of the light source or to refract incident light rays, wherein the active surface substantially follows in its entirety an imaginary basic shape, which is constructed as a part of a quadratic surface, wherein a targeted deviation from the virtual basic shape is provided for widening the light beam, and a plurality of optical sections, which form the active surface and are arranged in rows and columns in a grid-like manner, wherein the optical sections are arranged respectively obliquely to the virtual basic shape in order to deviate from the virtual basic shape, and wherein connecting surfaces are arranged between the optical portions as a result of a mutual offset, which offset is produced by a tilting of the optical portions relative to the virtual basic shape, wherein the connecting surfaces between the rows and/or columns of optical sections are configured as a portion of the circumference of a cylinder with a radius.

Description

Optical body for a motor vehicle headlight

Technical Field

The utility model relates to an optical body that is used for motor vehicle headlamps (Kraft farzungscheinwerfer, sometimes called motor vehicle headlamps), this optical body includes the following:

at least one optical active surface, which is designed to reflect or refract incident light, wherein the active surface substantially conforms to an imaginary basic shape over its entirety, which is curved, wherein a targeted deviation from the imaginary basic shape is provided for widening the light beam (strahlaufwweitsung), and

a plurality of optical portions which form the active surfaces and are arranged in rows and columns in a grid-like manner, wherein the optical portions are each arranged inclined to the virtual basic shape in order to deviate from the virtual basic shape, and wherein connecting surfaces are arranged between the optical portions on account of an offset which is produced by the optical portions being inclined to one another.

Furthermore, the invention relates to a motor vehicle headlight with at least one optical body according to the invention.

Background

An optical body configured as a reflector is used, for example, to divert an incident light ray into a certain direction. In the case of an ideal paraboloid as active surface and a punctiform light source, this punctiform light source is usually arranged in the focal point of the parabolic reflector.

However, it is necessary for motor vehicle headlights to widen the emitted light cone in a suitable manner in the horizontal and vertical directions in order to shape a legal light pattern. In order to achieve this and at the same time obtain a uniform appearance of the illuminated reflector, which is important in particular for signal light reflectors, the reflector surface is in practice faceted (facettieren), i.e. the reflector surface is divided into surface or optical sections. Each of these sections is inclined or curved with respect to an ideal parabolic shape in order to cause the widening described above.

By means of the facet plane and the deviation from the ideal parabolic shape, a connection surface must be added between the facets of the optical technique in order to obtain a coherent area. These connecting surfaces are likewise inclined with respect to the ideal parabolic shape, but also with respect to the optical section. This results in that light impinging on the connection surface is reflected with a deviation from the target direction. From a certain viewing direction, which deviates from a frontal view, for example, the connecting surface appears very bright. This increases the contrast between the minimum and maximum brightness in the area that is to be illuminated. However, these brightness differences are undesirable.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to provide an improved optical body for a motor vehicle headlight.

This object is achieved in that the connecting surfaces between the rows and/or columns of optical portions are formed as a part of a cylindrical surface (Zylindermantel) with a radius, wherein

The connecting surface formed as a part of the cylinder circumference is configured as a continuous ridge (Rille) or indentation with a radius, or

The connecting surface formed as part of the cylinder circumference is designed as an elongated projection with a radius.

The curved active surface may also follow a portion or section of a quadric surface (Quadrik).

In three dimensions, a conic surface generally describes a surface in space, which is also referred to as a secondary surface or a quadratic surface.

Examples of three-dimensional quadric surfaces are hyperboloids (double-shelled), ellipsoids, (hyperbolic) parabolas, cylinders, elliptic parabolas and cones.

In general, a quadric surface has a three-dimensional curved surface, wherein the degenerate quadric surface (austeartate Quadriken) has a rectilinear structure in some directions, such as for example a cylindrical surface in its height direction or a conical surface in the direction of the apex of the cone along the circumferential surface starting from the point of the base surface.

The connecting surface which is not shaped as part of the cylinder circumference may for example have a width in the order of 0.2mm to 1 mm.

The connecting surface, which is embodied as part of the circumference of the cylinder, reflects the incident light in a more widely spread manner, thus producing a more uniform appearance or light distribution (reduction of hot spots or light intensity maxima in a specific preferential direction, which corresponds to the reflection direction of the conventional optical section with the connecting surface) in terms of luminous impression (leucotheinderruk).

The connecting surface formed as a part of the circumference of the cylinder is formed, for example, as a bulge. In this case, it can be provided that the radius varies over the length of the one or more elevations over their length. It can thus be provided that one, more or all of the connecting surfaces or ridges, which are arranged in a row and/or in a row between the optical sections, extend starting on the side with the largest radius up to the opposite side with the smallest radius, wherein the radii each change gradually in length.

It is also possible to provide that the connecting surfaces which are formed as part of the circumference of the cylinder have different radii.

It can be provided that the optical body is designed as a reflector or a light guide.

In the case of a light guide, both the entry surface and the exit surface connection surface can be formed as a part of the cylindrical surface with a radius.

It can be provided that the virtual basic shape is shaped to form a parabola, a hyperbola, an ellipse or a plane.

It can be provided that the individual optical sections are configured to be flat or planar.

It can be provided that the radius is 0.1mm to 0.5mm, preferably 0.1mm to 0.3mm, in particular 0.2 mm.

The object is also achieved by a motor vehicle headlight having at least one optical body.

In this case, the motor vehicle headlight comprises at least one light source, which is positioned, for example, in a focal point of the reflector in an optical body designed as a reflector, which has the basic shape of a parabola.

In the case of an optical body designed as a light guide, the motor vehicle headlight may also comprise a plurality of light sources which are associated with the optical body and which couple light into or into the optical body.

The motor vehicle headlight may likewise comprise a projection lens which is arranged downstream in the emission direction or the steering direction of the reflector.

Drawings

The invention is further elucidated below with the aid of exemplary drawings. Here:

fig. 1 shows an optical body configured as a reflector, which has an active surface formed by a plurality of optical portions, which active surface substantially follows the basic shape of a parabola, in which a plurality of detail views are shown,

fig. 2A shows a schematic representation of a side view of an optical body configured as a reflector, the active surface of which follows a basic shape, wherein the optical sections have an offset to each other,

fig. 2B shows a schematic representation of a side view from fig. 2A, with connecting surfaces connecting the optic segments disposed between the excursions of the optic segments,

fig. 3 shows a detail of an exemplary reflector, in which the connecting surfaces between the rows of optical sections are shaped as a portion of the circumference of a cylinder with a radius,

fig. 4 shows a schematic representation of a side view of the reflector from fig. 3, wherein a part-cylindrical connecting surface with a radius can be seen,

figure 5A shows an exemplary optical body configured as a light guide with an active surface in a perspective view,

fig. 5B shows a detail of the active surface of the light guide from fig. 5A, the connecting surface between the rows and columns of optical sections being formed as part of the cylinder circumference.

Detailed Description

Fig. 1 shows an exemplary optical body 10 designed as a reflector for a motor vehicle headlight, which has an optical active surface 50, which is designed to reflect incident light of a light source, wherein the active surface 50 substantially conforms to an imaginary basic shape 60 in its entirety, which in the illustrated example is designed as a section of a paraboloid, wherein a targeted deviation from the imaginary basic shape 60 is provided for widening the light beam.

It should be noted that the virtual basic shape 60 may also be shaped as a hyperbola, ellipse or plane.

The reflector 10 furthermore comprises a plurality of optical portions 100 which form the active surface 50 and are arranged in a grid-like manner in rows and columns, wherein the optical portions 100 are arranged in each case at an inclination to the virtual basic shape 60 in order to deviate from the virtual basic shape 60, and wherein connecting surfaces 200 are arranged between the optical portions 100 on account of a mutual offset 110, which offset is produced by the inclination of the optical portions 100 relative to the virtual basic shape.

Fig. 2A shows a schematic representation of a side view of the reflector 10, in which it can be seen how the individual optical sections 100 are arranged inclined to the basic shape 60 of the virtual parabola. The offset 110 of the optic segments due to their inclination to one another is also seen. Offset 110 is understood here to mean the shortest distance of the directly adjacent end edges or edges of the optical portion 100 from one another, wherein such an offset typically ranges from 0.2mm to 1 mm. In the example shown, the optical portion 100 is designed to be flat, flat or planar and thus each forms a plane in the mathematical sense.

Fig. 2B shows the same schematic as fig. 2A with connecting surfaces 200 connecting the optical sections disposed between the offsets between the optical sections 100 shown.

Fig. 3 shows a perspective view of an optical body 10 embodied as a reflector, wherein, unlike the previously described embodiments, the connecting surfaces 200 between the rows of optical portions 100 are embodied as a portion of a cylindrical circumference with a radius.

Fig. 4 shows a schematic side view of the example from fig. 3, analogously to fig. 2A or 2B, wherein the connecting surface 200 with the radius R, which is formed as part of the cylinder circumference, can be clearly seen. The radius R can be 0.1mm to 0.5mm, preferably 0.1mm to 0.3mm, preferably 0.2 mm. The connecting surface 200, which is formed as part of the circumference of the cylinder, is here formed as a bulge. In this case, it can be provided that the radius varies over the length of one or more elevations. It can thus be provided that one, more or all of the connecting surfaces 200 or ridges, which are arranged in a row and/or in a row between the optical sections 100, extend starting on the side with a radius R of 0.3mm up to the opposite side with a radius R of r0.1mm, wherein the radius R changes gradually.

It is also possible to provide that the connecting surfaces 200, which are designed as part of the cylinder circumference, have different radii R.

Fig. 5A shows an exemplary optical body 20 designed as a light guide with an entry surface designed as an active surface 50, which is designed to refract incident light of a light source and to couple it into the light guide. On the opposite side of the entry face, a corresponding exit face is arranged, which is however not visible due to the selected perspective. In this example, the active surface 50 substantially follows an arched or virtually curved basic shape, wherein the rest of the explanations for the above examples apply equally to the example of a light guide, wherein the only difference is that the connecting surface 200, which is shaped as a part of the cylinder circumference, is here shaped as an elongated projection.

Fig. 5B shows a detail view of the active surface 50 or entry surface of the light guide, wherein the connection surfaces 200 between the optical portions 100 are designed in a row and column fashion as a part of the circumferential surface of a cylinder with a radius.

It can be provided that the exit surface of the light guide is likewise equipped with an optical section and a corresponding connection surface.

List of reference numerals

10,20 optical bodies

10 Reflector

20 optical conductor

50 action surface

60 virtual basic shape

100 optic segment

110 offset

200 connecting surface

Radius R

Claims

1. An optical body for a motor vehicle headlamp, the optical body comprising:

-at least one optically active surface (50) which is designed to reflect or refract incident light rays of the light source, wherein the active surface (50) substantially conforms to an imaginary basic shape (60) over its entire extent, which imaginary basic shape is designed to be curved, wherein targeted deviations from the imaginary basic shape (60) are provided for widening the light beam, and

-a plurality of optical sections (100) which form the active surface (50) and are arranged in rows and columns in a grid-like manner, wherein the optical sections (100) are arranged each at an inclination to the virtual basic shape (60) in order to deviate from the virtual basic shape, and wherein connecting surfaces (200) are arranged between the optical sections (100) on account of a mutual offset (110) which is produced by the inclination of the optical sections relative to the virtual basic shape,

it is characterized in that the preparation method is characterized in that,

the connecting surfaces (200) between the rows and/or columns of optical sections (100) are designed as a part of the cylinder circumference with a radius (R), wherein

The connecting surface (200) formed as a part of the cylinder circumference is designed as a continuous bead or recess with a radius (R), or

The connecting surface (200) formed as part of the cylinder circumference is designed as an elongated projection with a radius (R).

2. Optical body according to claim 1, characterized in that it is configured as a reflector (10) or a light conductor (20).

3. The optical body according to any one of claims 1 or 2, characterized in that said virtual basic shape (60) is shaped like a parabola, a hyperbola, an ellipse or a plane.

4. The optical body according to one of claims 1 or 2, characterized in that each optical section (100) is of planar design.

5. The optical body according to any one of claims 1 or 2, wherein the radius (R) is from 0.1mm to 0.5 mm.

6. The optical body of claim 1, wherein a radius of the ridge or the elongated protrusion varies over its length.

7. The optical body of claim 6, wherein at least one, a plurality, or all of the protuberances extend from the side with the largest radius up to the smallest radius.

8. The optical body of claim 7, wherein at least one, a plurality or all of the elongated protrusions extend from the side with the largest radius up to the smallest radius.

9. The optical body of claim 5, wherein the radius (R) is 0.1mm to 0.3 mm.

10. The optical body according to claim 9, wherein the radius (R) is 0.2 mm.

11. The optical body of claim 7, wherein the radius varies gradually.

12. The optical body of claim 8, wherein the radius varies gradually.

13. An automotive headlamp provided with at least one optical body according to any one of claims 1 to 12.