# US 2013/0155691 A1 · Lens structure for mobile phone flashlight

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- Number: US 2013/0155691 A1
- Document ID: US20130155691A1
- Status: Published application
- Kind: A1
- Application number: 13/684,194
- Filed: 2012-11-22
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: Lion Optics Co., Ltd.
- Inventors: Hung-Yu Hsieh
- Web page: https://patentgrep.com/patent/US20130155691A1

## CPC

- F21V 5/045: {the lens having discontinuous faces, e.g. Fresnel lenses}
- G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)}
- G03B 15/03: Combinations of cameras with lighting apparatus; Flash units
- G03B 2215/0567: Solid-state light source, e.g. LED, laser
- G03B 2215/0592: installed in front of light emitter
- 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
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

A lens structure for mobile phone flashlight is provided, to improve luminance of edge area and overall luminance. The lens structure includes a lens body. The lens body includes an incident surface and a light-emitting surface, and the incident surface is a Fresnel lens. Edge area of the light-emitting surface is partially disposed symmetrically with at least a pair of second surfaces, and remaining area forms a first surface. The edges of the second surfaces tilt towards direction of the incident surface so that the first surface forms an angle with the second surfaces. As such, the lens structure is able to refract light to project in near rectangular area onto a target object when taking picture.

## Claims

### Claim 1

A lens structure for mobile phone flashlight, comprising a lens body, said lens body comprising an incident surface and a light-emitting surface, said incident surface being a Fresnel lens, characterized in that:
edge area of said light-emitting surface being partially disposed symmetrically with at least a pair of second surfaces, and remaining area forming a first surface; edge of said second surfaces tilting towards direction of said incident surface so that said first surface forming an angle with said second surfaces.

### Claim 2 (depends on 1)

The lens structure as claimed in claim 1, wherein said angle ranges between 130° and 178°.

### Claim 3 (depends on 1)

The lens structure as claimed in claim 1, wherein said second surface is one of slant surface and curvy surface.

### Claim 4 (depends on 1)

The lens structure as claimed in claim 1, wherein said second surface comprises at least a slant surface and a curvy surface.

### Claim 5 (depends on 1)

The lens structure as claimed in claim 1, wherein said second surface comprises at least two curvy surfaces of different curvatures.

### Claim 6 (depends on 1)

The lens structure as claimed in claim 1, wherein two pairs of said second surfaces are disposed symmetrically.

### Claim 7 (depends on 6)

The lens structure as claimed in claim 6, wherein edge of said light-emitting surface comprises four said second surface disposed in equi-angle manner.

### Claim 8 (depends on 6)

The lens structure as claimed in claim 6, wherein bordering lines between said first surface and said second surfaces form a rectangle.

### Claim 9 (depends on 1)

The lens structure as claimed in claim 1, wherein when said lens is used with a light source, light emitting from said second surface is refracted to focus onto a projected area formed by light emitting from said first surface.