# US 8,786,175 B2 · Lighting device, a lamp and a luminaire

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- Number: US 8,786,175 B2
- Document ID: US8786175B2
- Status: Granted
- Kind: B2
- Application number: 14/004,511
- Filed: 2012-02-28
- Published: 2013-12-26
- Granted: 2014-07-22
- Earliest claimed: 2011-03-16
- Assignees: Koninklijke Philips N.V.
- Applicants: Ties Van Bommel; Rifat Ata Mustafa Hikmet
- Inventors: Ties Van Bommel; Rifat Ata Mustafa Hikmet
- Web page: https://patentgrep.com/patent/US8786175B2

## CPC

- F21K 9/232: specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
- F21K 9/60: Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K 9/64: using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
- F21V 7/0016: {on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes}
- F21V 13/08: the elements being filters or photoluminescent elements and reflectors
- H01J 61/38: Devices for influencing the colour or wavelength of the light
- H01J 61/40: by light filters; by coloured coatings in or on the envelope
- H10H 20/8515: {not being in contact with the bodies}
- F21S 6/00: Lighting devices intended to be free-standing (F21S9/00, F21S10/00, {F21S13/12} take precedence {lighting devices specially adapted to be transported from place to place, e.g. lighting devices carried on wheeled supports F21L; details of supports for lighting devices F21V21/00})
- F21V 3/02: characterised by the shape
- F21V 3/12: the coatings comprising photoluminescent substances
- F21Y 2115/10: Light-emitting diodes [LED]
- H01K 1/26: Screens; Filters (associated with envelope H01K1/28)
- H10H 20/8512: {Wavelength conversion materials}
- 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
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- 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
- H01K: ELECTRIC INCANDESCENT LAMPS (details, apparatus or processes for manufacture applicable to both discharge devices and incandescent lamps H01J; light sources using a combination of incandescent and other types of light generation H01J61/96, H05B35/00)

## Abstract

A lighting device 100, a lamp and a luminaire is provided. The light device 100 emits a first color distribution predominantly in a first direction and a second color distribution predominantly in a second direction. The lighting device comprises a light exit window, a light source 118, a light distributing layer 108, and a luminescent material. Light 104, 106 is emitted into the ambient of the lighting device through the light exit window. The light exit window has a first part 110 for an escape of light of the first color distribution and a second part 102 for an escape of light of the second color distribution. The second part 102 is different from the first part 110. The light source emits light of a predefined color distribution. The predefined color distribution comprises light of a first color 106. The light distributing layer 108 partly reflects or backscatters impinging light and partly transmits impinging light. The light distributing layer 108 is arranged in between the light source 118 and the second part 102 of the light exit window. The light distributing layer 108 is not fully transparent and has an edge near the light exit window for separating the first part 110 and the second part 102. The luminescent material converts light of the first color 106 to light of a second color 104. The luminescent material is arranged in the light distributing layer 108, is arranged in between the light distributing layer 108 and the second part 102 of the light exit window, or is arranged at the first part 110 of the light exit window or the second part 102 of the light exit window.

## Claims

### Claim 1

A lighting device for emitting a first color distribution predominantly in a first direction and for emitting a second color distribution predominantly in a second direction, the lighting device comprising:
a light exit window for emitting light into the ambient of the lighting device, the light exit window having a first part for an escape of light of the first color distribution and a second part for an escape of light of the second color distribution, the second part being different from the first part,
a light source for emitting light of a predefined color distribution comprising light of a first color,
a first light distributing layer for partly reflecting or backscattering impinging light and partly transmitting impinging light, the first light distributing layer arranged in between the light source and the second part of the light exit window, the first light distributing layer not being fully transparent, the first light distributing layer having an edge near the light exit window for separating the first part and the second part,
a luminescent material for converting light of the first color to light of a second color, the luminescent material being arranged in the first light distributing layer, or being arranged in between the first light distributing layer and the second part of the light exit window, or being arranged on the first part of the light exit window or on the second part of the light exit window.

### Claim 2 (depends on 1)

A lighting device according to claim 1, wherein the first light distributing layer comprises a diffusing plate.

### Claim 3 (depends on 1)

A lighting device according to claim 1, wherein at least one of the predefined color distribution, the first color and the second color comprise light of a color in the visible light spectrum.

### Claim 4 (depends on 1)

A lighting device according to claim 1, wherein the luminescent material is an organic phosphor.

### Claim 5 (depends on 4)

A lighting device according to claim 4, wherein the organic phosphor comprises perylene derivatives.

### Claim 6 (depends on 1)

A lighting device according to claim 1, further comprising another luminescent material for converting a first color into a third color, the another luminescent material being arranged in between the light source and the first part of the light exit window or arranged in between the light source and the first light distributing layer.

### Claim 7 (depends on 1)

A lighting device according to claim 1, further comprising a second light distributing layer for partly reflecting or backscattering impinging light and partly transmitting impinging light, the second light distributing layer being arranged in between the first light distributing layer and the second part of the light exit window, the second light distributing layer not being fully transparent, wherein
the light exit window has a third part overlapping with a section of the second part of the light exit window,
the second light distributing layer has an edge near the light exit window for forming a border of the third part.

### Claim 8 (depends on 7)

A lighting device according to claim 7, further comprising a further luminescent material for converting light of a first color light of a fourth color, the luminescent material being arranged in the second light distributing layer, or in between the second light distributing layer and the third part of the light exit window.

### Claim 9 (depends on 1)

A lighting device according to claim 1, wherein, the light source is provided on the first light distributing layer and the light source emits light in a direction away from the first light distributing layer.

### Claim 10 (depends on 1)

A lighting device according to claim 1, wherein, the first light distributing layer has a shape which is a non-flat for influencing the directions in which light is reflected, scattered, transmitted and/or emitted.

### Claim 11 (depends on 1)

A lighting device according to claim 1, the light distributing layer comprising at least one of:
a color filter for filtering the color distribution of light which is transmitted through the color filter,
a switchable scattering element for scattering light in response to a control signal,
a dichromatic filter for filtering a color of light which is transmitted through the dichromatic filter and reflecting light of another color.

### Claim 12 (depends on 1)

A lamp comprising the lighting device according to claim 1.

### Claim 13 (depends on 12)

A lamp according to claim 12 comprising a retrofit light bulb or a light transmitting tube, wherein the light exit window is formed by the retrofit light bulb and the light source is arranged on a base of the retrofit light bulb, or wherein the light exit window is formed by a part of a light transmitting tube and the light source is arranged on a section of the light transmitting tube being different from the light exit window.

### Claim 14 (depends on 7)

A lighting device according to claim 7, wherein the light source is provided on the first light distributing layer or on the second light distributing layer and the light source emits light in a direction away from the first light distributing layer or away from the second light distributing layer (312), respectively.

### Claim 15 (depends on 7)

A lighting device according to claim 7, wherein at least one of the first light distributing layer and the second light distributing layer has a shape which is a non-flat for influencing the directions in which light is reflected, scattered, transmitted and/or emitted.