# US 8,540,409 B2 · Light guide and semiconductor luminaire

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- Number: US 8,540,409 B2
- Document ID: US8540409B2
- Status: Granted
- Kind: B2
- Application number: 12/789,398
- Filed: 2010-05-27
- Published: 2011-12-01
- Granted: 2013-09-24
- Earliest claimed: 2010-05-27
- Assignees: OSRAM Opto Semiconductors GmbH
- Applicants: Christopher Eichelberger
- Inventors: Christopher Eichelberger
- Web page: https://patentgrep.com/patent/US8540409B2

## CPC

- G02B 6/0006: {Coupling light into the fibre (in general G02B6/4298)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

In at least one embodiment, the light guide (10) comprises a single-pieced light guide body (1). The light guide body (1) includes a transparent material and a light entrance segment (2) having a first cross-section (11) with a polygonal shape. Furthermore, the light guide body (1) includes a light output segment (4) having a second cross-section (22) with a rotund, round, circular, oval or elliptic shape. A transition segment (3) is arranged adjacent to and between the light entrance segment (2) and the light output segment (4). Along the transition segment (3), the first cross-section (11) in particular continuously changes to the second cross-section (22).

## Claims

### Claim 1

A light guide, comprising a single-pieced light guide body, the light guide body includes:
a transparent material;
a light entrance segment having a first cross section with a polygonal shape;
a light output segment having a second cross section with a circular or elliptic shape; and
a transition segment arranged adjacent to and between the light entrance segment and the light output segment,
wherein the first cross section changes to the second cross section along the transition segment, and
further comprising a cladding,
wherein the cladding is in direct contact with the light guide body,
wherein the cladding comprises a translucent material with a coefficient of reflection of 0.75 or more,
wherein the cladding completely covers the light guide body in a direction perpendicular to a direction of main light guidance, and
wherein the cladding has a constant or nearly constant diameter along the direction of main light guidance.

### Claim 2 (depends on 1)

The light guide according to claim 1, wherein the first cross section comprises an area Al and the second cross section comprises an area A2, and wherein 1≦A2/A1≦2.

### Claim 3 (depends on 1)

The light guide according to claim 1, wherein the transition segment comprises a length T and the second cross section comprises an average diameter D2, and wherein 0.75≦T/D2≦1.75.

### Claim 4 (depends on 3)

The light guide according to claim 3, wherein 3 mm≦D2≦25 mm.

### Claim 5 (depends on 3)

The light guide according to claim 3, wherein the light guide body comprises an overall length L and the light entrance segment comprises a length E, and wherein 0.5≦E/L≦0.75.

### Claim 6

The light guide according to claim, wherein 0.1≦T/L ≦0.8.

### Claim 7 (depends on 1)

The light guide according to claim 1, wherein a shape of the first cross section is rectangular or square.

### Claim 8 (depends on 1)

The light guide according to claim 1, wherein the light guide body is a rigid body and has a longitudinal axis which is a straight line.

### Claim 9 (depends on 1)

The light guide according to claim 1, wherein a cross section area of the light guide body monotonically increases along the direction of main light guidance.

### Claim 10 (depends on 1)

A semiconductor luminaire comprising:
at least one light guide according to claim 1;
a carrier;
a light source arranged on the carrier, the light source including at least one Optoelectronic semiconductor chip for emittinng radiation; and
a housing providing a firm mechanical connection between the carrier and the light guide;
wherein in operation the light source emits multi-colored visible radiation, and
wherein the light guide is capable of mixing the different colors of the multi-colored visible radiation.

### Claim 11 (depends on 10)

The semiconductor luminaire according to claim 10, wherein the light guide body of the light guide, at a light entrance face, is form-fit with the light source and the carrier at least in part.

### Claim 12 (depends on 10)

The semiconductor luminaire according to claim 10, wherein the housing further comprises a connector for mechanically and optically connecting a light pipe with the semiconductor lamp, the connector being located on a light output face of the light guide body remote from the carrier.