# US 10,478,918 B2 · Method for manufacturing optical film

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,478,918 B2
- Document ID: US10478918B2
- Status: Granted
- Kind: B2
- Application number: 15/527,446
- Filed: 2015-11-16
- Published: 2017-11-16
- Granted: 2019-11-19
- Earliest claimed: 2014-11-20
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Takuya Miura; Masaya Hirano
- Web page: https://patentgrep.com/patent/US10478918B2

## CPC

- B23K 26/073: Shaping the laser spot
- B23K 26/0622: by shaping pulses
- B23K 26/38: by boring or cutting
- G02B 1/00: Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B 27/0927: {Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat}
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A method for producing an optical film including a cutting step of performing irradiation with a laser light onto a layered body having a glass support and a resin layer provided on the support to cut the resin layer, wherein in the cutting step, the irradiation with the laser light is performed such that a beam of the laser light has a flat energy distribution, and a distance between a focus of the laser light and a receiving point of the laser light on a surface of the resin layer where the laser light is received or a ratio P/V of an output P of the laser light relative to a scanning speed V is in a specific range.

## Claims

### Claim 1

A method for producing an optical film comprising a cutting step of performing irradiation with a laser light onto a layered body having a support and a resin layer provided on the support to cut the resin layer, wherein
in the cutting step, the irradiation with the laser light is performed such that
a beam of the laser light has a flat energy distribution, and
a distance between a focus of the laser light and a receiving point of the laser light on a surface of the resin layer where the laser light is received is 0.1 to 1 mm.

### Claim 2 (depends on 1)

The method for producing an optical film according to claim 1, wherein in the cutting step, the irradiation with the laser light is performed such that a ratio P/V of an output P (W) of the laser light relative to a scanning speed V (mm/s) is 0.10 or more and 0.25 or less.

### Claim 3 (depends on 1)

The method for producing an optical film according to claim 1, wherein the laser light has a wavelength of 9 μm or more and 9.5 μm or less.

### Claim 4 (depends on 1)

The method for producing an optical film according to claim 1, wherein the resin layer contains one or more cyclic olefin resin layers.

### Claim 5 (depends on 1)

The method for producing an optical film according to claim 1, wherein the resin layer contains one or more polarizer layers.