# US 2010/0165459 A1 · Lens unit and projection screen made of the same

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- Number: US 2010/0165459 A1
- Document ID: US20100165459A1
- Status: Published application
- Kind: A1
- Application number: 12/559,889
- Filed: 2009-09-15
- Published: 2010-07-01
- Earliest claimed: 2008-12-11
- Assignees: Industrial Technology Research Institute
- Inventors: Ding-Zheng Lin; Yaw-Ting Wu; You-Chia Chang; Chun-Hsiang Wen; Jyi-Tyan Yeh
- Web page: https://patentgrep.com/patent/US20100165459A1

## CPC

- G03B 21/60: characterised by the nature of the surface
- 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 unit and a projection screen made of the same are disclosed. The lens unit includes a micro lens having a light incident surface and a light emergent surface opposing to the light incident surface; a light absorbing layer formed on the light emergent surface of the micro lens and having a cavity formed therein; a scattering layer formed in the cavity of the light absorbing layer and including a transparent resin blended with scattering particles; and a reflective layer formed on the light absorbing layer and the scattering layer. The projection screen includes a plurality of the lens units, thereby achieving high contrast and high energy utilization efficiency of incident light with a large viewing angle.

## Claims

### Claim 1

A lens unit, comprising:
a micro lens having a light incident surface and a light emergent surface opposing the light incident surface;
a light absorbing layer formed on the light emergent surface of the micro lens and formed with a cavity;
a scattering layer formed in the cavity of the light absorbing layer and made of a transparent resin blended with scattering particles; and
a reflective layer formed on the light absorbing layer and the scattering layer.

### Claim 2 (depends on 1)

The lens unit of claim 1, wherein the micro lens is made of a transparent material without absorbing light.

### Claim 3 (depends on 1)

The lens unit of claim 1, wherein the light absorbing layer is made of a mixture of a resin and a color material.

### Claim 4 (depends on 3)

The lens unit of claim 3, wherein the color material is carbon black, pigment or dyestuff.

### Claim 5 (depends on 1)

The lens unit of claim 1, wherein the reflective layer is made of metal with high reflectivity.

### Claim 6 (depends on 5)

The lens unit of claim 5, wherein the metal with high reflectivity are silver, aluminum or chromium.

### Claim 7 (depends on 1)

The lens unit of claim 1, wherein the micro lens has a thickness between 0.007 mm and 8 mm.

### Claim 8 (depends on 1)

The lens unit of claim 1, wherein the light incident surface of the micro lens is a curved surface with a radius of curvature between 0.0007 mm and 40 mm.

### Claim 9 (depends on 1)

The lens unit of claim 1, wherein the micro lens has a width between 0.007 mm and 8 mm.

### Claim 10 (depends on 1)

The lens unit of claim 1, wherein the scattering layer has a width between 0.0007 mm and 7.2 mm.

### Claim 11 (depends on 1)

The lens unit of claim 1, wherein a ratio of a width of the scattering layer to a width of the micro lens is between 0.1 and 0.9.

### Claim 12 (depends on 1)

The lens unit of claim 1, wherein a refractive index of the scattering layer is between 1 and 3.

### Claim 13 (depends on 1)

The lens unit of claim 1, wherein the scattering particles of the scattering layer have particle sizes between 0.1 μm and 100 μm.

### Claim 14 (depends on 1)

The lens unit of claim 1, wherein the light absorbing layer has a thickness between 0.001 mm and 1 mm.

### Claim 15 (depends on 1)

The lens unit of claim 1, wherein the reflective layer has a thickness between 0.001 mm and 1 mm.

### Claim 16 (depends on 1)

The lens unit of claim 1, wherein the scattering particles of the scattering layer are made of at least one material selected from a group consisting of an inorganic material, an organic material, air and metal.

### Claim 17 (depends on 1)

A projection screen comprising a plurality of the lens units of claim 1.