# US 10,503,004 B2 · Polarizer

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- Number: US 10,503,004 B2
- Document ID: US10503004B2
- Status: Granted
- Kind: B2
- Application number: 15/735,264
- Filed: 2016-06-20
- Published: 2018-06-21
- Granted: 2019-12-10
- Earliest claimed: 2015-06-25
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Masahiro Yaegashi; Shinobu Nagano; Shusaku Goto; Daisuke Ogomi; Yuki Nakano
- Web page: https://patentgrep.com/patent/US10503004B2

## CPC

- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00)
- G02F 1/133528: {Polarisers}
- H05B 33/02: Details
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

There is provided a polarizer having a non-polarization portion that can achieve the multi-functionalization and high-functionalization of an electronic device, such as an image display apparatus, the polarizer being excellent in dimensional stability and external appearance of the non-polarization portion. A polarizer according to an embodiment of the present invention includes a resin film containing a dichromatic substance, wherein: the polarizer has a non-polarization portion at a predetermined position; and the non-polarization portion includes a thin-walled portion thinner than another portion of the resin film.

## Claims

### Claim 1

A polarizer, wherein:
the polarizer is a resin film comprising a dichroic substance and has a non-polarization portion at a predetermined position;
the non-polarization portion comprises a thin-walled portion thinner than another portion of the resin film, a step formed between the thin-walled portion and another portion of the resin film is 2 μm or less, and
the non-polarization portion has a content of an alkali metal and/or an alkaline earth metal of 3.6 wt % or less.

### Claim 2 (depends on 1)

The polarizer according to claim 1, wherein the polarizer has a thickness of 10 μm or less.

### Claim 3 (depends on 1)

The polarizer according to claim 1, wherein the non-polarization portion comprises a low-concentration portion having a content of the dichroic substance lower than that of the another portion of the resin film.

### Claim 4 (depends on 3)

The polarizer according to claim 3, wherein the content of the dichroic substance of the non-polarization portion is 1.0 wt % or less.

### Claim 5 (depends on 1)

The polarizer according to claim 1, wherein the non-polarization portion has a content of the dichroic substance of 1.0 wt % or less.

### Claim 6 (depends on 1)

The polarizer according to claim 1, wherein the non-polarization portion has a transmittance of 50% or more.

### Claim 7 (depends on 1)

The polarizer according to claim 1, wherein the non-polarization portion has a transmittance of 90% or more.

### Claim 8 (depends on 1)

The polarizer according to claim 1, wherein the resin film comprises a polyvinyl alcohol-based resin film containing iodine.

### Claim 9 (depends on 1)

A polarizing plate, comprising:
the polarizer of claim 1; and
a protective film arranged on at least one side of the polarizer.

### Claim 10 (depends on 1)

An image display apparatus, comprising the polarizer of claim 1, wherein the non-polarization portion is arranged at a position corresponding to a camera portion.

### Claim 11 (depends on 9)

An image display apparatus, comprising the polarizing plate of claim 9, wherein the non-polarization portion is arranged at a position corresponding to a camera portion.

### Claim 12

A polarizer, wherein:
the polarizer is a polyvinyl alcohol-based resin film comprising iodine, having a thickness of 10 μm or less and has a non-polarization portion at a predetermined position;
the non-polarization portion comprises a thin-walled portion thinner than another portion of the resin film, a step formed between the thin-walled portion and another portion of the resin film is 2 μm or less;
the non-polarization portion has a content of iodine of 1.0 wt % or less and has a content of an alkali metal and/or an alkaline earth metal of 3.6 wt % or less; and
the non-polarization portion has a transmittance of 50% or more.

### Claim 13 (depends on 1)

The polarizer according to claim 1, wherein the polarizer has a thickness of 5 μm or less.

### Claim 14 (depends on 12)

The polarizer according to claim 12, wherein the polarizer has a thickness of 5 μm or less.