# US 2010/0163754 A1 · Self-cleaning system and window-glass

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- Number: US 2010/0163754 A1
- Document ID: US20100163754A1
- Status: Published application
- Kind: A1
- Application number: 12/663,525
- Filed: 2008-06-11
- Published: 2010-07-01
- Earliest claimed: 2007-06-14
- Assignees: Koninklijke Philips Electronics N.V.
- Inventors: Maarten Marinus Johannes Wilhelmus Van Herpen
- Web page: https://patentgrep.com/patent/US20100163754A1

## CPC

- B32B 17/10761: {containing vinyl acetal}
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10174: {Coatings of a metallic or dielectric material on a constituent layer of glass or polymer}
- Y10T 428/252: Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to a self-cleaning system (10) and window glass. The self-cleaning system comprises a translucent substrate (20), a light-emitting device (30) and a photo-catalytic layer (40) applied to a surface (22) of the translucent substrate for generating a self-cleaning surface. The photo-catalytic layer produces the self-cleaning effect when illuminated with light of a predefined wavelength range. The translucent substrate is translucent for at least a sub-range of the predefined wavelength range. The light-emitting device is arranged for illuminating the photo-catalytic layer via the translucent substrate, an emission spectrum emitted by the light-emitting device comprising light within the sub-range. The effect of the illumination system according to the invention is that the illumination of the photo-catalytic layer via the translucent substrate enables the light-emitting device to be arranged relatively near to the photo-catalytic layer such that only a relatively low light flux is required from the light-emitting device to activate the self-cleaning process.

## Claims

### Claim 1

A self-cleaning system, comprising:
a first translucent substrate;
a light-emitting device;
a photo-catalytic layer applied to a surface of the first translucent substrate for providing a self-cleaning surface, the photo-catalytic layer being arranged for producing the self-cleaning effect when illuminated with light of a predefined wavelength range, the translucent substrate being translucent for at least a sub-range of the predefined wavelength range, and the light-emitting device being arranged for illuminating the photo-catalytic layer via the translucent substrate, an emission spectrum emitted by the light-emitting device comprising light within the sub-range; and
a second translucent substrate for reflecting at least part of the light within the sub-range emitted by the light-emitting device.

### Claim 2 (depends on 1)

Self-cleaning system as claimed in claim 1, wherein the second translucent substrate is substantially parallel to the first translucent substrate and wherein the light-emitting device is sandwiched between the first translucent substrate and the second translucent substrate.

### Claim 3 (depends on 1)

Self-cleaning system as claimed in claim 1, wherein the self-cleaning system comprises a semi-transparent or substantially transparent conductor arrangement connecting the light-emitting device to a power source for driving the light emitting device.

### Claim 4 (depends on 3)

Self-cleaning system as claimed in claim 3, wherein the semi-transparent or substantially transparent conductor arrangement (50, 52) comprises:
substantially transparent conductive material, or
a plurality of non-transparent electrically conductive wires, a distance (D) between two adjacent non-transparent electrical conductive wires being larger than 5 times a diameter (d) of the non-transparent conductive wires, or
a pattern of conductive ink applied to the translucent substrate or the further translucent substrate.

### Claim 5 (depends on 2)

Self-cleaning system as claimed in claim 2 wherein the light-emitting device is embedded in a thermoplastic material arranged between the first and the second translucent substrates.

### Claim 6

(canceled)

### Claim 7 (depends on 1)

Self-cleaning system as claimed in claim 1 wherein part of the light emitted by the light-emitting device progresses through the self-cleaning system via reflection or via total internal reflection.

### Claim 8 (depends on 7)

Self-cleaning system as claimed in claim 7, wherein the light from the light-emitting device is emitted in an angular distribution around a central vector, the central vector being arranged substantially parallel to the photo-catalytic layer.

### Claim 9 (depends on 1)

Self-cleaning system as claimed in claim 1, wherein the photo-catalytic layer comprises titanium dioxide in an anatase-mineral form, or comprises titanium dioxide spiked with nitrogen ions.

### Claim 10 (depends on 1)

Self-cleaning system as claimed in claim 1, wherein the light-emitting device is a light emitting diode, or an organic light emitting diode, or a polymer light emitting diode, or a laser diode.

### Claim 11 (depends on 1)

Self-cleaning system as claimed in claim 1, wherein the self-cleaning system comprises an array of light-emitting devices.

### Claim 12 (depends on 1)

Self-cleaning system as claimed in claim 1, wherein the light-emitting device comprises a plurality of light emitters.

### Claim 13

(canceled)