# US 9,752,757 B2 · Light-emitting device with light guide for two way illumination

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- Number: US 9,752,757 B2
- Document ID: US9752757B2
- Status: Granted
- Kind: B2
- Application number: 14/170,222
- Filed: 2014-01-31
- Published: 2014-05-29
- Granted: 2017-09-05
- Earliest claimed: 2013-03-07
- Assignees: Quarkstar LLC
- Applicants: Quarkstar LLC
- Inventors: John J. Uebbing; Roland H. Haitz
- Web page: https://patentgrep.com/patent/US9752757B2

## CPC

- F21V 13/04: the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)}
- F21K 9/64: using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
- F21K 9/66: Details of globes or covers forming part of the light source
- F21V 3/04: characterised by materials, surface treatments or coatings
- G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems}
- G02B 19/0061: {the light source comprising a LED}
- F21Y 2115/10: Light-emitting diodes [LED]
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

A variety of light-emitting devices are disclosed that are configured to manipulate light provided by one or more light-emitting elements (LEEs). In general, a light-emitting device includes one or more light-emitting elements (LEEs) disposed on a base surface that are configured to emit light, a first optical element having a first surface spaced apart from the LEEs and positioned to receive light from the LEEs, a transparent second optical coupled to the first optical element, and a reflector element adjacent the second optical element arranged to reflect a portion of light output from the second optical element.

## Claims

### Claim 1

A light-emitting device, comprising:
a base substrate having a base surface;
one or more light-emitting elements (LEEs) configured to emit light, the LEEs being disposed on the base surface;
a first optical element having a first surface spaced apart from the LEEs and positioned to receive light from the LEEs, the first optical element comprising scattering centers arranged to scatter light from the LEEs;
a second optical element having an exit surface, the second optical element being transparent and in contact with the first optical element, there being an optical interface between the first and second optical elements at the place of contact, the optical interface being opposite the first surface of the first optical element, the second optical element being arranged to receive light from the first optical element through the optical interface; wherein:
a medium adjacent to the first surface of the first optical element has a refractive index n0;
the first optical element comprises a first material having a first refractive index n1, where n0<n1;
the second optical element comprises a second material having a refractive index n2, where n0<n2;
the exit surface is shaped such that an angle of incidence on the exit surface of the light provided by the first optical element that directly impinges on the exit surface is less than a critical angle for total internal reflection; and
a reflector element adjacent the second optical element, the reflector element having first and second surfaces extending away from the exit surface, the reflector element being arranged to reflect a first portion of light from the second optical element.

### Claim 2 (depends on 1)

The light-emitting device of claim 1, wherein the first surface is reflective and facing the LEEs, the first surface being arranged to reflect the first portion of light.

### Claim 3 (depends on 2)

The light-emitting device of claim 2, wherein the second surface is reflective and opposite the first surface, the second surface being arranged to reflect a second portion of light from the second optical element.

### Claim 4 (depends on 2)

The light-emitting device of claim 2, wherein the second surface is opposite the first surface and configured to absorb a second portion of light from the second optical element.

### Claim 5 (depends on 1)

The light-emitting device of claim 1, further comprising a heat sink coupled to the base substrate, the heat sink being configured to remove heat from the light-emitting element.

### Claim 6 (depends on 1)

The light-emitting device of claim 1, wherein the first and second surfaces of the reflector element are arranged to reflect light received from the exit surface of the second optical element.

### Claim 7 (depends on 1)

The light-emitting device of claim 1, wherein the first optical element has a dome shape.

### Claim 8 (depends on 1)

The light-emitting device of claim 1, wherein the first optical element and the base surface form an enclosure surrounding the one or more LEEs.

### Claim 9

A light-emitting device, comprising:
a base substrate having a base surface;
one or more light-emitting elements (LEEs) configured to emit light, the LEEs being disposed on the base surface;
a first optical element having a first surface spaced apart from the LEEs and positioned to receive light from the LEEs, the first optical element comprising scattering centers arranged to scatter light from the LEEs;
a second optical element having an exit surface, the second optical element being transparent and in contact with the first optical element, there being an optical interface between the first and second optical elements at the place of contact, the optical interface being opposite the first surface of the first optical element, the second optical element being arranged to receive light from the first optical element through the optical interface; wherein:
a medium adjacent to the first surface of the first optical element has a refractive index n0;
the first optical element comprises a first material having a first refractive index n1, where n0<n1;
the second optical element comprises a second material having a refractive index n2, where n0<n2;
the exit surface is shaped such that an angle of incidence on the exit surface of the light provided by the first optical element that directly impinges on the exit surface is less than a critical angle for total internal reflection; and
a light guide adjacent to the second optical element, the light guide having a reflective first surface on one side of the light guide facing the LEEs and arranged to reflect a first portion of light from the second optical element.

### Claim 10 (depends on 9)

The light-emitting device of claim 9, wherein a second surface of the one side of the light guide is configured to reflect a second portion of light from the second optical element, the second surface opposing the first surface.

### Claim 11 (depends on 9)

The light-emitting device of claim 9, wherein the first optical element has a dome shape.

### Claim 12 (depends on 9)

The light-emitting device of claim 9, wherein the first optical element and the base surface form an enclosure surrounding the one or more LEEs.