# US 10,118,170 B1 · Anti-bacterial lighting apparatus

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- Number: US 10,118,170 B1
- Document ID: US10118170B1
- Status: Granted
- Kind: B1
- Application number: 15/865,621
- Filed: 2018-01-09
- Granted: 2018-11-06
- Earliest claimed: 2018-01-09
- Assignees: Aleddra Inc.
- Applicants: Aleddra Inc.
- Inventors: Chia-Yiu Maa; Chun-Te Yu
- Web page: https://patentgrep.com/patent/US10118170B1

## CPC

- B01J 35/39: Photocatalytic properties
- F21V 3/04: characterised by materials, surface treatments or coatings
- H05B 45/00: Circuit arrangements for operating light-emitting diodes [LED]
- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 23/50: Silver
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A lighting apparatus that includes at least one light source and at least one transparent or translucent lens, and at least one anti-bacterial composite film. The anti-bacterial composite film that includes photocatalytic particles and nano silver particles is formed on at least a part of the outer surface of the lens. With this anti-bacterial composite film, the lighting apparatus retains its germicidal function when the light source is turned off. Moreover, at least 95% of the spectral power distribution (SPD) of the light source comes from the visible light wavelength range (>400 nm). Artificial light sources such as LED can also be used with the anti-bacterial lighting apparatus.

## Claims

### Claim 1

A lighting apparatus, comprising of:
at least one light source;
at least one lens that is transparent or translucent; and
at least one anti-bacterial composite film,
wherein:
the at least one light source is enclosed at least partially by the at least one lens,
the at least one anti-bacterial composite film comprises photocatalytic particles and nano silver particles,
the at least one anti-bacterial composite film is formed on at least a part of an outer surface of the at least one lens, and
at least 95%, of a spectral power distribution (SPD) of the at least one light source is in a visible light wavelength range greater than 400 nm.

### Claim 2 (depends on 1)

The lighting apparatus of claim 1, wherein the photocatalytic particles comprise rhombus-shape anatase-type titanium dioxide (TiO2).

### Claim 3 (depends on 1)

The lighting apparatus of claim 1, wherein the at least one light source comprises a light emitting diode (LED).

### Claim 4 (depends on 1)

The lighting apparatus of claim 1, wherein a thickness of the anti-bacterial composite film is less than 200 nm.

### Claim 5 (depends on 1)

The lighting apparatus of claim 1, wherein an overall light transmittance of the anti-bacterial composite film is greater than 90%.