# US 2014/0192509 A1 · Illumination device

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- Number: US 2014/0192509 A1
- Document ID: US20140192509A1
- Status: Published application
- Kind: A1
- Application number: 14/148,457
- Filed: 2014-01-06
- Published: 2014-07-10
- Earliest claimed: 2008-06-24
- Assignees: Light In Light S.R.L.
- Applicants: Light In Light S.R.L.
- Inventors: Paolo DI TRAPANI; Marta Cecilia PIGAZZINI
- Web page: https://patentgrep.com/patent/US20140192509A1

## CPC

- F21V 9/02: for simulating daylight (F21V9/04, F21V9/06 take precedence)
- F21V 3/00: Globes; Bowls; Cover glasses (with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506)
- F21V 9/08: for producing coloured light, e.g. monochromatic; for reducing intensity of light (with provision for controlling the colour F21V9/40)
- F21V 9/30: Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40)
- F21V 9/40: with provision for controlling spectral properties, e.g. colour, or intensity
- G02B 5/0242: {by means of dispersed particles}
- G02B 6/001: {the light being emitted along at least a portion of the lateral surface of the fibre}
- G02B 6/0041: {provided in the bulk of the light guide}
- G02B 6/0096: {the lights guides being of the hollow type}
- G02B 19/0047: {for use with a light source (G02B19/009, G02B19/0095 take precedence; details of lighting devices in general F21V; non-semiconductor lasers having optical devices external to the laser cavity H01S3/005)}
- G02B 19/0071: {adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source}
- G02B 27/30: Collimators
- F21K 9/00: Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K 9/61: using light guides
- F21S 8/033: {the surface being a wall or like vertical structure, e.g. building facade}
- F21W 2121/00: Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00
- F21W 2131/103: of streets or roads
- F21Y 2115/10: Light-emitting diodes [LED]
- F21Y 2115/30: Semiconductor lasers
- H10H 20/851: Wavelength conversion means
- H10H 20/882: {Scattering means (H10H20/82 takes precedence)}
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- 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
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

An embodiment of an illumination device comprising a broad band artificial light source and a non-liquid chromatic diffuser transparent to visible light comprising a dispersion of elements of nanometrical dimensions of a first material with of certain refractive index in a second material with different refractive index, wherein the light is scattered producing a separation and different distribution between cold and hot components of the light originally produced by the source, according to a scattering process in “Rayleigh” regime. The device allows illumination effects similar to those of natural outdoor environments to be reproduced in indoor environments.

## Claims

### Claim 1

An illumination device comprising:
a broad-band artificial light source comprising one or more active elements which are configured to emit photons or to absorb photons and then re-emit photons at a higher wavelength; and
a chromatic diffuser;
wherein the maximum dimension of said chromatic diffuser is equal to or greater than twice the minimum dimension of the projection of the largest of said active elements in a plane perpendicular to the maximum emission direction of said light source, wherein the maximum dimension of said chromatic diffuser is defined as the maximum distance between any two points belonging to the projection of the chromatic diffuser in a plane perpendicular the maximum emission direction; and wherein the illumination device is configured to produce a narrow inner cone of transmitted light and a wider outer cone of diffused light, the transmitted light being more intense and warmer than the diffused light.

### Claim 2 (depends on 1)

The illumination device according to claim 1, wherein the broad-band artificial light source is formed by a blue or ultraviolet LED or laser diode, associated with a phosphor which is configured to emit at least in the yellow region.

### Claim 3 (depends on 1)

The illumination device according to claim 1, further comprising a lens configured to collimate the transmitted light.

### Claim 4 (depends on 1)

The illumination device according to claim 1, further comprising a lens configured to collimate the radiation generated by the broad-band artificial light source so as to form the inner cone, or to reduce the angle of divergence of said radiation.

### Claim 5 (depends on 2)

The illumination device according to claim 2, further comprising a lens configured to collimate the radiation generated by the broad-band artificial light source so as to form the inner cone, or to reduce the angle of divergence of said radiation.

### Claim 6 (depends on 1)

The illumination device according to claim 1, further comprising a plurality of light sources.

### Claim 7 (depends on 1)

The illumination device according to claim 1, wherein the broad-band artificial light source is formed by a plurality of white light LEDs.

### Claim 8 (depends on 1)

The illumination device according to claim 1, comprising an array of blue or ultraviolet LEDs, an array of phosphors and an array of collimating lenses, each LED being optically coupled to a corresponding phosphor, each phosphor being coupled to a corresponding lens.