Anti-Reflection Film and Polarizing Plate Using the Same

• US 20090052041A1
• Filed: 08/18/2008
• Published: 02/26/2009
• Est. Priority Date: 08/20/2007
• Status: Abandoned Application

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Watanabe, Yuki, Kiyokawa, Kazutoshi, Kurauchi, Yasunori, Awa, Jyunko
• Application Number:
  US12/193,570
• Publication Number:
  US 20090052041A1
• Time in Patent Office: Days
• US Class Current: 359/586
• CPC Class Codes: G02B 1/113 using inorganic layer materials only
• CPC Class Codes: G02B 1/115 Multilayers
• CPC Class Codes: G02B 1/18 Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films G02B1/16 takes precedence
• CPC Class Codes: G02B 27/0006 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation G02B1/18 takes precedence; cleaning in general B08B
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

An anti-reflection (AR) film has a transparent substrate film; a hard coat layer which is formed on one surface of the transparent substrate film; and an AR layer which is formed on the hard coat layer. And the AR layer has a four-layer stacked structure of alternate high and low refractive index material layers; the total thickness of the low refractive index material layer is in the range 90-130 nm; and the arithmetic mean roughness Ra of the AR layer surface is in the range 1.5-3.0 nm.

Claims

1. An anti-reflection (AR) film comprising:

a transparent substrate film;

a hard coat layer which is formed on one surface of the transparent substrate film; and

an AR layer which is formed on said hard coat layer, said AR layer having a four-layer stacked structure of alternate high and low refractive index material layers, the total thickness of said low refractive index material layer being in the range 90-130 nm, and the arithmetic mean roughness Ra of said AR layer'"'"'s surface being in the range 1.5-3.0 nm.

2. The AR film according to claim 1, wherein said low refractive index material layer includes silicon oxide.

3. The AR film according to claim 1, wherein said low refractive index material layer consists of silicon oxide.

4. The AR film according to claim 1, wherein said AR layer is formed by sputtering technique with a deposition pressure in the 0.5-2.0 Pa range.

5. The AR film according to claim 1, wherein a primer layer comprising one or more layer(s) which includes a metal;

alloy;

metal compound;

or a mixture made of metal, alloy or metal oxide, is formed between said hard coat layer and said AR layer.

6. The AR film according to claim 1, wherein an antifouling layer is formed on said AR layer.

7. The AR film according to claim 5, wherein the arithmetic mean roughness Ra of said antifouling layer surface is 1.0-5.0 nm.

8. The AR film according to claim 1, wherein said transparent substrate film includes a TAC film.

9. The AR film according to claim 1, wherein said transparent substrate film consists of a TAC film.

10. The AR film according to claim 1, wherein water vapor permeability at a temperature of 40°

C. and humidity of 90% RH is 20 g/m²/day or more.

11. A polarizing plate which comprises said AR film according to claim 1.