WO1999001695B1

WO1999001695B1 - Optical attachment for a light-emitting diode and brake light for a motor vehicle

Info

Publication number: WO1999001695B1
Application number: PCT/DE1998/001802
Authority: WO
Filing date: 1998-07-01
Publication date: 1999-02-25

Abstract

The invention relates to an optical attachment (10) for a light source, especially for a light-emitting diode (12), comprising an inner lens area (14) which surrounds the optical axis (13) of said attachment (10) and is designed for inner light rays (15) emitted by the light source, and an outer reflector area (16) which surrounds the inner lens area (14) in a ring-shaped manner and is designed for outer light rays (17) emitted by the light source. The combination of refraction in the inner lens area and reflection in the outer reflector area allows for the dimensions of the optical attachment to be kept relatively small. It further makes it possible to capture more light than a lens or a reflector and for the point-shaped light-emitting diode on the output side to appear as a large luminous surface.

Claims

1 CHANGED CLAIMS [received at the International Bureau on 24 December 1998 (24.12.98); original claims 1-13 replaced by amended claims 1-10 (3 pages)]

An attachment (10; 10 ') for a light source, in particular for a light-emitting diode (12), with an optical axis; (13; 13 ') of the attachment (10; 10') surrounding the inner lens region (14; 14 ') for inner light rays (15; 15') emitted by the light source and with an annular surrounding the inner lens region (14; 14 ') outer reflector region (16, 16 ') for external light beams (17; 17') of the light source, characterized in that the front attachment (IC; 10 ') has a non-rotational ion-symmetrical, preferably rectangular or square, effective cross-section on the light exit side and into individual angle sectors (25, 25a, 25b, 25 ', 25a', 25b ') is subdivided with respect to the optical axis (13, 13'), all axial cross sections being within an angular sector (25, 25a, 25b; 25 ', 25a', 25b ') are substantially the same, and that the axial cross sections of two angular sectors (25, 25a, 25b; 25', 25a ', 25b') are scaled with respect to a front focal point (11; 11 ') of the attachment (10; '), wherein the scaling according to the ratio of the respective s largest radial extent of the attachment (10; 10 ') in the two angular sectors (25, 25a, 25b _; 25', 25a ', 25b').

2. An attachment according to claim 1, characterized in that the outer reflector region (16; 16 ') directly adjoins the inner lens region (14; 14').

MODIFIED BLUE (ARTICLE 19)

3. An attachment according to claim 1 or 2, characterized in that the inner lens portion (14, 14 ') is designed as a converging lens.

4. An attachment according to claim 3, characterized in that the inner lens portion (14 ') is designed as Fres-ielsche step lens.

5. An attachment according to one of the preceding claims, characterized by an open towards the light source feed opening (18; 18 ') in front of the inner lens region (14; 14'), on whose inner peripheral wall (20; 20 ') the outer rays (17 17 ') of the light source are fed to the outer reflector region (16, 16').

6. An attachment according to one of the preceding claims, characterized by the outer light beams (17, 17 ') which are fed into the outer reflector region (16, 16') and project towards the outer peripheral surface (21, 21 ') of the attachment (10, 10'). ,

7. An attachment according to claim 6, characterized in that the outer peripheral surface (21, 21 ') of the outer reflector region (16; 16') with respect to the optical axis (13; 13 ') of the attachment (10, - 10') at least partially formed parabolic or consisting of straight segments.

8. An attachment according to one of the preceding claims, characterized by a located on the light exit side central opening (22; 22 ') in the attachment (10;

10 '). 1 9

9. An attachment according to one of the preceding claims, characterized by a in the inner lens region (14, 14 ') located, coaxial with the optical axis (13, 13') extending central cylinder (23, 23 ').

10. brake light, in particular Bremsmittel_euchte, for a vehicle having a plurality, preferably in a row, juxtaposed light sources, preferably light-emitting diodes (12), with them each prefixed intent (10; 10 ') according to one of the preceding claims.