# US 2014/0153090 A1 · Projection system

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- Number: US 2014/0153090 A1
- Document ID: US20140153090A1
- Status: Published application
- Kind: A1
- Application number: 14/239,207
- Filed: 2012-08-22
- Published: 2014-06-05
- Earliest claimed: 2011-08-24
- Inventors: Takashi Takenouchi; Fumio Karasawa; Toru Sasaki
- Web page: https://patentgrep.com/patent/US20140153090A1

## CPC

- G03B 21/62: Translucent screens
- G03B 21/602: Lenticular screens (G03B21/625 takes precedence)
- G03B 21/625: Lenticular translucent screens
- 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

The present application provides a projection system by which constraints placed on space use of a user can be reduced. The projection system includes: a projector and a screen. The screen includes a first film for transmitting image light incoming from the projector and a second film for transmitting the image light transmitted through the first film. A pattern for refracting or reflecting the image light toward the second film is formed on a light entrance face of the first film receiving the image light. The incident angle of the image light entering the first film is not less than 20 degrees.

## Claims

### Claim 1

A projection system comprising: a projector and
a screen which comprises a first film for transmitting image light incoming from the projector, and a second film for transmitting the image light transmitted through the first film,
wherein
a pattern for refracting or reflecting the image light toward the second film is formed on a light entrance face of the first film receiving the image light, and
an incident angle of the image light entering the first film is not less than 20 degrees.

### Claim 2 (depends on 1)

The projection system according to claim 1, wherein the pattern is a substantially concentric circular pattern formed by a plurality of prismatic concavoconvex patterns.

### Claim 3 (depends on 1)

The projection system according to claim 1, wherein the incident angle of the image light entering the first film is not less than 25 degrees.

### Claim 4 (depends on 1)

The projection system according to claim 1, wherein the incident angle of the image light entering the second film is less than 20 degrees.

### Claim 5 (depends on 4)

The projection system according to claim 4, wherein the incident angle of the image light entering the second film is not more than 15 degrees.

### Claim 6 (depends on 1)

The projection system according to claim 1, wherein a bead layer is coated on the light entrance face of the second film receiving the image light.

### Claim 7 (depends on 6)

The projection system according to claim 6, wherein a light absorption layer is formed on an inner side of the bead layer.

### Claim 8 (depends on 1)

The projection system according to claim 1, wherein the first film and the second film face each other across an intermediate layer having a refraction index of less than 1.3.

### Claim 9 (depends on 8)

The projection system according to claim 8, wherein an edge of the first film and an edge of the second film are laminated via a bonding layer, and the intermediate layer is an air layer.