# US 11,028,977 B2 · Light emitting module

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- Number: US 11,028,977 B2
- Document ID: US11028977B2
- Status: Granted
- Kind: B2
- Application number: 16/632,365
- Filed: 2018-07-17
- Published: 2020-07-16
- Granted: 2021-06-08
- Earliest claimed: 2017-07-21
- Assignees: Signify Holding B.V.
- Applicants: Signify Holding B.V.
- Inventors: Ties Van Bommel; Robert Jacob Pet; Alexander Henricus Walterus Van Eeuwijk
- Web page: https://patentgrep.com/patent/US11028977B2

## CPC

- F21K 9/23: Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
- F21K 9/62: using mixing chambers, e.g. housings with reflective walls
- F21K 9/68: Details of reflectors forming part of the light source
- F21S 8/06: by suspension
- F21Y 2103/33: annular
- F21Y 2105/00: Planar light sources
- F21Y 2115/10: Light-emitting diodes [LED]
- 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
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- 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

The invention provides a light emitting module (100) which comprises a light mixing chamber (101). The light mixing chamber comprises a base (102), at least one partly light transmissive side wall (103), an at least partly light transmissive-semi-reflective light exit window (104), a carrier (107), and at least one light emitting diode (105). The base (102) has a reflective inner surface (114). The at least one partly light transmissive side wall (103) extends from the base (102) towards the at least partly light transmissive, semi-reflective light exit window (104) which is arranged opposite to the base (102). The carrier (107) carries at least one light emitting diode (105) and is positioned at a distance (D1) from a nearest portion (108) of the at least one partly light transmissive side wall (103). The at least one light emitting diode (105) is arranged to emit source light (106) in a main direction different from 90 degrees with respect to the semi-reflective light exit window (104) and in the main direction away from the nearest portion (108) of the at least one partly light transmissive side wall (103) to enable subsequent mixing of the source light (106) within the mixing chamber (101) to generate mixed light (106′). The semi-reflective light exit window (104) and the at least one partly light transmissive side wall (103) are arranged to couple out source light (106) and mixed light (106′) as emitted light (106″). The mixing chamber has an inner mixing chamber width (W1) in the direction along the base (102) between the nearest portion (108) of the at least one partly light transmissive side wall (103) and an opposite portion (109) of the at least one partly light transmissive side wall (103) which is positioned opposite to the nearest portion (108) of the at least one partly light transmissive side wall (103). An inner mixing chamber height (H1) spaces the base (102) and the semi-reflective light exit window (104). The inner mixing chamber width (W1) and the inner mixing chamber height (H1) have an aspect ratio in the range of 4 to 15. The semi-reflective light exit window (104) has a reflectivity in the range from 30 to 80% for source light (106) and mixed light (106′). The distance (D1) from the at least one light emitting diode (105) to the nearest portion (108) of the at least one partly light transmissive side wall (103) is in the range from 5 to 30% of the inner mixing chamber width (W1).

## Claims

### Claim 1

A light emitting module comprising a light mixing chamber comprising:
a base having a reflective inner surface,
at least one partly light transmissive side wall extending from the base towards an at least partly light transmissive, semi-reflective light exit window arranged opposite to the base, and
a carrier for carrying at least one light emitting diode and being positioned at a distance (D1) from a nearest portion of the at least one partly light transmissive side wall, wherein
the at least one light emitting diode is arranged to emit source light in a main direction different from 90 degrees with respect to the semi-reflective light exit window and in the main direction away from the nearest portion of the at least one partly light transmissive side wall for enabling subsequent mixing of the source light within the mixing chamber to generate mixed light, and
wherein the semi-reflective light exit window and the at least one partly light transmissive side wall are arranged for coupling out source light and mixed light as emitted light,
wherein the mixing chamber has an inner mixing chamber width (W1) in the direction along the base between the nearest portion of the at least one partly light transmissive side wall and an opposite portion of the at least one partly light transmissive side wall being positioned opposite to the nearest portion of the at least one partly light transmissive side wall, and an inner mixing chamber height (H1) spacing the base and the semi-reflective light exit window, wherein a ratio of the inner mixing chamber width (W1) to the inner mixing chamber height (H1) is in the range of 4:1 to 15:1,
wherein the semi-reflective light exit window has a reflectivity in the range from 30 to 80% for source light and mixed light, and
wherein the distance (D1) from said carrier to the nearest portion of the at least one partly light transmissive side wall is in the range from 5 to 30% of the inner mixing chamber width (W1).

### Claim 2 (depends on 1)

A light emitting module according to claim 1, wherein the carrier has a carrier height (H2) transverse to the semi-reflective light exit window.

### Claim 3 (depends on 2)

A light emitting module according to claim 2, wherein the carrier comprises a carrier length (L1), the carrier length (L1) being at least 5 times the carrier height (H2).

### Claim 4 (depends on 1)

A light emitting module according to claim 1, wherein the carrier is ring shaped in a direction along the semi-reflective light exit window, and preferably the ring shape has a cross-section of a circle, oval, hexagon, square or rectangle.

### Claim 5 (depends on 2)

A light emitting module according to claim 2, wherein the carrier height (H2) is less than 0.6 times the inner mixing chamber height (H1).

### Claim 6 (depends on 1)

A light emitting module according to claim 1, wherein the at least one light emitting diode is positioned closer to the base than to the semi-reflective light exit window.

### Claim 7 (depends on 1)

A light emitting module according to claim 1, wherein the at least one light emitting diode comprises a collimator arranged to collimate the light in the direction to the opposite portion.

### Claim 8 (depends on 1)

A light emitting module according to claim 1, wherein the carrier is transmissive for visible light.

### Claim 9 (depends on 8)

A light emitting module according to claim 8, wherein the carrier is translucent and/or comprises through holes in the carrier at a portion of the carrier adjacent to the at least one light emitting diode.

### Claim 10 (depends on 1)

A light emitting module according to claim 1, wherein the shape of the cross section of the carrier in a direction along the semi-reflective light exit window resembles a shape of a cross-section of the at least one partly light transmissive side wall.

### Claim 11 (depends on 1)

A light emitting module according to claim 1, wherein the at least one partly light transmissive side wall is semi reflective, semi refractive or semi diffractive.

### Claim 12 (depends on 1)

A light emitting module according to claim 1, wherein the reflectivity of the at least one partly light transmissive side wall is less than the reflectivity of the semi-reflective light exit window.

### Claim 13 (depends on 1)

A light emitting module according to claim 1, wherein the at least one light emitting diode comprises a plurality of light emitting diodes, wherein the light emitting diodes are arranged at a different positions along the carrier length (L1) of the carrier, and wherein the pitch (P1) between neighboring light emitting diodes is smaller than the inner mixing chamber height (H1).

### Claim 14 (depends on 1)

A lamp or luminaire comprising the light emitting module as claimed according to claim 1 provided with at least one driver.

### Claim 15 (depends on 1)

A lighting system comprising at least two light emitting modules as claimed in claim 1.