Light guides for vehicles

The integration of a defocusing body with a widening part and straight part in the light coupling section addresses non-homogeneous illumination issues, achieving uniform light distribution and efficient mixing of RGB colors in vehicle light guides.

DE102012108855B4Active Publication Date: 2025-10-09HELLA GMBH & CO KGAA
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Patent Information

Application Number
DE102012108855
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2012-09-20
Publication Date
2025-10-09
Estimated Expiration
2032-09-20

AI Technical Summary

Technical Problem

Existing light guides for vehicles suffer from non-homogeneous illumination due to undesired brightness maxima and limited mixing of light beams, particularly when using RGB LEDs, leading to inefficient and non-uniform light distribution.

Method used

A defocusing body with a widening part and a straight part is integrated into the light coupling section, featuring defocusing outer surfaces to scatter and mix light beams uniformly before entering the main section, preventing luminance maxima and enabling optimal mixing of RGB colors.

Benefits of technology

The solution achieves uniform illumination of the light guide without significant efficiency loss, ensuring high luminance uniformity and efficient mixing of light beams, particularly suitable for RGB LEDs, while avoiding brightness maxima.

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Abstract

Optical fiber for vehicles with a light coupling section for coupling in light at a first end (2) and / or at a second end of the rod-shaped optical fiber (1), with a main section (4) which has a front side (5) extending between the first end (2) and the second end of the optical fiber (1) for coupling out light and a rear side (6) extending between the first end (2) and the second end of the optical fiber (1) containing coupling-out elements (7) for deflecting the coupled-in light (L1) in the direction of the front side (5), in that the light coupling section is designed as a defocusing body (3) extending between a light coupling surface (9) and the main section (4), wherein the defocusing body (3) has a defocusing outer surface (14, 15) which has a plurality of convex-shaped sections (16, 17) or concave-shaped sections in the circumferential direction, wherein the convex-shaped sections (16,17) or the concave sections extend continuously from the light coupling surface (9) to the main section (4), characterized in that the defocusing body (3) has a conical widening part (12) adjoining the spherically formed light coupling surface (9) and a cylindrical straight part (13) extending between the widening part (12) and the main section (4), wherein the defocusing outer surfaces (14, 15) of the widening part (12) and the straight part (13) have a continuous contour in the circumferential direction and in the longitudinal direction of the light guide (1), and in that a length (I1) of the defocusing body (3) is at least twice as large as a diameter (d) of the main section (4) of the light guide (1).
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