Optical surface and lighting device for vehicles

Patent metadata

Field	Value
Publication number	US-9810390-B2
Application number	US-201314420882-A
Country	US
Kind code	B2
Filing date	Aug 14, 2013
Priority date	Aug 14, 2012
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

An optical surface for softening a light/dark border of a lighting device for vehicles, having a grid of lens elements distributed over a base surface, by means of which a light bundle passing through the optical surface can be diffused in relation to a main direction, wherein the lens elements are each designed as micro-lens elements, which, on one hand, exhibit a central main emission surface, which follows a contour of the base surface, by means of which the light beams of the light bundle are deflected in a main direction corresponding to the contour of the base surface, and on the other hand, exhibit subsidiary emission surfaces, running at an angle to the central main emission surface, by means of which light beams of the light bundle are diffused in a diffusion direction in relation to the main direction.

First claim

The invention claimed is:

1. An optical surface for softening a light/dark border of a lighting device for vehicles comprising:
a grid of lens elements distributed over a base surface, by means of which a light bundle passing through the optical surface can be diffused in relation to a main direction,
wherein the lens elements are each designed as micro-lens elements, which have a central main emission surface following a contour of the base surface, by means of which light beams of the light bundle are deflected in a manner corresponding to the contour of the base surface in the main direction, and which has a subsidiary emission surface outwardly projecting from the base surface running at an angle to the central main emission surface, by means of which light beams of the light bundle are diffused in relation to the main direction in a diffusion direction,
wherein the micro-lens elements are each designed in the shape of a dish at the central main emission surface, and
wherein the central main emission surface of each micro-lens element is flat.

2. The optical surface according to claim 1 , wherein the central main emission surface has substantially the same contour as the contour of the base surface of the optical surface running in a normal direction, displaced parallel thereto.

3. The optical surface according to claim 1 wherein the central main emission surface exhibits a spacing to the base surface of the optical surface in a range of 0.001 mm to 0.15 mm.

4. The optical surface according to claim 1 wherein the subsidiary emission surface runs at an angle, in a range of 74° to 89.9°, from the central main emission surface toward the base surface with respect to the central main emission surface.

5. The optical surface according to claim 1 wherein the micro-lens elements are disposed at a spacing to one another, wherein the base surface of the optical surface extends between the micro-lens elements.

6. The optical surface according to claim 1 wherein the base surface of the optical surface is designed such that it is at least one of flat and/or convex, or corresponds to freeform surface.

7. The optical surface according to claim 1 wherein the micro-lens elements form a boundary surface with the base surface of the optical surface.

8. An optical surface for softening a light/dark border of a lighting device for vehicles comprising:
a grid of lens elements distributed over a base surface, by means of which a light bundle passing through the optical surface can be diffused in relation to a main direction,
wherein the lens elements are each designed as micro-lens elements, which have a central main emission surface following a contour of the base surface, by means of which light beams of the light bundle are deflected in a manner corresponding to the contour of the base surface in the main direction, and which has a subsidiary emission surface including opposing straight first portions extending perpendicularly upwardly from the base surface and a second curved portion adjoining the central main emission surface in a continuous manner, by means of which light beams of the light bundle are diffused in relation to the main direction in a diffusion direction,
wherein the micro-lens elements are each designed in the shape of a dish at the central main emission surface, and
wherein the central main emission surface of each micro-lens element is domed.

9. An optical surface for softening a light/dark border of a lighting device for vehicles comprising:
a grid of lens elements distributed over a base surface, by means of which a light bundle passing through the optical surface can be diffused in relation to a main direction,
wherein the lens elements are each designed as micro-lens elements, which have a central main emission surface following a contour of the base surface, by means of which light beams of the light bundle are deflected in a manner corresponding to the contour of the base surface in the main direction, and which has a subsidiary emission surface outwardly projecting from the base surface running at an angle to the central main emission surface, by means of which light beams of the light bundle are diffused in relation to the main direction in a diffusion direction,
wherein the micro-lens elements are each designed in the shape of a dish at the central main emission surface,
wherein the central main emission surface of each micro-lens element is flat or domed,
wherein the central main emission surface exhibits a spacing to the base surface of the optical surface in a range of 0.001 mm to 0.15 mm, and
wherein the subsidiary emission surface runs at an angle, in a range of 74° to 89.9°, from the central main emission surface toward the base surface with respect to the central main emission surface.

Assignees

• Hella Kgaa Hueck & Co

Inventors

• Hagedorn Susanne
• Stockfisch Andreas
• Streich-Schulz Klaus

Classifications

• F21V5/004

  using microlenses · CPC title

• F21W2102/18

  for overhead signs · CPC title

• F21V13/04

  the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)} · CPC title

• F21S41/25

  Projection lenses · CPC title

• F21W2107/10

  for land vehicles · CPC title