Optical body for a vehicle light
An optical body for a vehicle light serves for coupling in, passing on and emitting the light delivered by a light source in a conical spatial region. It has a light emission surface and a recess which is opposite thereto and which has a longitudinal axis. The recess has an annularly closed inner peripheral wall which surrounds the longitudinal axis and a cover wall which extends transversely relative to its longitudinal axis and in which there is an optical structure. To improve the emission, a plurality of optically active surface portions are provided arranged around the point at which the longitudinal axis of the recess passes through the cover wall and each of which has a focal point lying on the longitudinal axis and the focal points of at least two of the surface portions are at a mutual spacing in the direction of the longitudinal axis.
1. An optical body for a vehicle light for coupling in, passing on and emitting the light delivered by a light source in a conical spatial region, comprising:
a light emission surface and
a recess which is opposite the light emission surface and which has a longitudinal axis and in which the light source can be so positioned that the central axis of the conical spatial region coincides with the longitudinal axis of the recess and wherein the recess has an annularly closed inner peripheral wall which surrounds the longitudinal axis and a cover wall which extends transversely relative to the longitudinal axis and which is provided with an optical structure for altering a spread angle of a light beam passing therethrough,
wherein the optical structure of the cover wall of the recess includes a plurality of optically active surface portions which are arranged around a point at which the longitudinal axis of the recess passes through the cover wall and each of which has a focal point lying on the longitudinal axis and wherein the focal points of at least two of said surface portions are mutually spaced in along the longitudinal axis.
2. An optical body according to claim 1 wherein the optical structure has four immediately mutually adjoining, substantially equally sized surface portions which subdivide the cover wall into four quadrants, all the focal points of which are spaced from each other along the longitudinal axis.
3. An optical body according to claim 1 , wherein the surface portions of the cover wall are lens surfaces which are curved forwardly convexly into the interior of the recess and which blend uniformly into each other.
4. An optical body according to claim 1 , wherein the peripheral wall includes a plurality of optically active surface portions, each of which has a focal point which lies on the longitudinal axis of the recess, and wherein the focal points of at least two of said surface portions are mutually spaced along the longitudinal axis.
5. An optical body according to claim 4 , wherein the peripheral wall has four directly mutually adjoining, approximately equal-sized surface portions, all the focal points of which are spaced from each other along the longitudinal axis.
6. An optical body according to claim 5 , wherein the surface portions of the peripheral wall are in the form of concave lens surfaces which blend uniformly into each other.
7. An optical body according to claim 1 , wherein the focal point of at least one surface portion of the optical structure in the cover wall of the recess coincides with the focal point of one of the surface portions of the peripheral wall.
8. An optical body according to claim 1 , further comprising two main surfaces which are mutually opposite each other with respect to a main central plane and which are connected together by side surfaces so as to form a plate-shaped configuration, wherein one of the side surfaces forms the light emission surface while the opposite side surface is formed only by narrow edge regions which surround the recess and starting from which two further side surfaces extend in the direction of the light emission surface and are shaped in a manner forming light conduction surfaces which pass on the light, that is coupled into the optical body and incident thereon from the interior, to the light emission surface by total reflection.
9. An optical body according to claim 8 , wherein each of the two further side surfaces include two surface portions which extend in the longitudinal direction thereof and which mutually adjoin along section lines of the further side surfaces with the main central plane and each of which is in the form of part of an outwardly convex parabolic surface having a focal point on the longitudinal axis of the recess, and wherein the focal points of at least two of said surface portions are mutually spaced along the longitudinal axis.
10. An optical body according to claim 9 , wherein all focal points of the surface portions are spaced from each other along the longitudinal axis.
11. An optical body according to claim 1 , wherein at least one of the focal points lies on a portion of the longitudinal axis that is within the recess.
12. An optical body according to claim 11 , wherein at least one of the focal points lies on a portion of the longitudinal axis of the recess that is outside the recess.
13. An optical body according to claim 11 , wherein at least one of the focal points lies on a portion of the longitudinal axis of the recess that is outside the recess.
14. An optical body according to claim 1 , wherein each of the optically active surface portions is part of a parabolic surface.
15. An optical body according to claim 1 , wherein an optical emission means is provided on the light emission surface for homogenizing and spreading light passing therethrough over a vertical and a horizontal angular region.
16. An optical body according to claim 8 , comprising a plurality of recesses and optical bodies arranged in a row parallel to said main central plane.
17. A vehicle light comprising at least one optical body for coupling in, passing on and emitting the light delivered by a light source in a conical spatial region, comprising:
a light emission surface and
a recess which is opposite the light emission surface and which has a longitudinal axis and in which the light source can be so positioned that the central axis of the conical spatial region coincides with the longitudinal axis of the recess and wherein the recess has an annularly closed inner peripheral wall which surrounds the longitudinal axis and a cover wall which extends transversely relative to the longitudinal axis and which is provided with an optical structure for altering a spread angle of a light beam passing therethrough,
wherein the optical structure of the cover wall of the recess includes a plurality of optically active surface portions which are arranged around a point at which the longitudinal axis of the recess passes through the cover wall and each of which has a focal point lying on the longitudinal axis and wherein the focal points of at least two of said surface portions are mutually spaced in along the longitudinal axis.
18. A vehicle light according to claim 17 , wherein said at least one optical body comprises a plurality of optical bodies arranged with the main central planes thereof lying in a common plane and with emission surfaces thereof blending into each other.
19. A vehicle light according to claim 18 , wherein the optical bodies are integrally connected together.