# US 12,222,527 B2 · Light diffusion film

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- Number: US 12,222,527 B2
- Document ID: US12222527B2
- Status: Granted
- Kind: B2
- Application number: 17/636,179
- Filed: 2020-09-23
- Published: 2022-09-22
- Granted: 2025-02-11
- Earliest claimed: 2019-10-31
- Assignees: Kimoto Co., Ltd.
- Applicants: Kimoto Co., Ltd.
- Inventors: Sho Suzuki; Tatsuya Kato; Kazutoshi Tachibana
- Web page: https://patentgrep.com/patent/US12222527B2

## CPC

- G02B 5/02: Diffusing elements; Afocal elements
- G02B 5/0226: {having particles on the surface}
- G02B 5/0268: {characterized by the fabrication or manufacturing method}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

There is provided a light diffusion film in which a decrease in the half-value angle can be suppressed even after processing with a high elongation rate. A light diffusion film including a base material film and a light diffusing layer, the light diffusing layer containing light diffusing particles and a resin binder, wherein a ratio (T/t) of an average film thickness T of the light diffusing layer, to an average particle diameter t of the light diffusing particles, is 3.0 or more.

## Claims

### Claim 1

A light diffusion film comprising a base material film and a light diffusing layer, the light diffusing layer containing light diffusing particles having an average particle diameter t of 0.4 μm or more and a resin binder,
wherein a ratio (T/t) of an average film thickness T of the light diffusing layer to the average particle diameter t of the light diffusing particles, is 3.0 or more,
wherein, when the light diffusion film is used for thermoforming, a half-value angle H40 of the light diffusion film at an elongation rate of 40% is within a range of a value 25% lower than a value of a half-value angle H0 before elongation, or more and a value 25% higher than the value of the half-value angle H0 before elongation, or less, and
wherein an amount of the light diffusing particles loaded is 30% by mass or more and 80% by mass or less based on a total amount of solids in the light diffusing layer.

### Claim 2 (depends on 1)

The light diffusion film according to claim 1,
wherein the light diffusing particles have an average particle diameter t of 0.5 to 10.0 μm.

### Claim 3 (depends on 2)

The light diffusion film according to claim 2,
wherein the light diffusing layer has an average film thickness T of 1.5 to 30 μm.

### Claim 4 (depends on 1)

The light diffusion film according to claim 1,
wherein the light diffusing layer has an average film thickness T of 1.5 to 30 μm.

### Claim 5 (depends on 1)

The light diffusion film according to claim 1,
wherein the light diffusing layer contains voids inside.

### Claim 6 (depends on 1)

The light diffusion film according to claim 1,
wherein an amount of the light diffusing particles loaded is 50% by mass or more and 75% by mass or less based on a total amount of solids in the light diffusing layer.

### Claim 7 (depends on 1)

The light diffusion film according to claim 1,
wherein the light diffusing layer is exposed on an outermost surface.

### Claim 8 (depends on 1)

The light diffusion film according to claim 1,
wherein the light diffusing particles include thermoplastic resin particles or thermosetting resin particles.

### Claim 9 (depends on 1)

The light diffusion film according to claim 1,
wherein the resin binder includes a thermoplastic resin.

### Claim 10 (depends on 1)

The light diffusion film according to claim 1,
wherein the half-value angle H40 of the light diffusion film at an elongation rate of 40% is 10° or more.