Antireflection film, polarizing plate and image display

Abstract

An antireflection film is provided and has at least one hard coat layer and a low refractive-index layer having a refractive index of 1.47 or less as the outermost layer on a transparent support. The roughness Ra of the antireflection film is 0.03 μm or more and when it is assumed that average 5° specular reflectance is A and average integrated reflectance is B in a wavelength range of 450 nm to 650 nm, B−A<4 Ra.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The features of the invention will appear more fully upon consideration of the exemplary embodiments of the invention, which are schematically set forth in the drawings, in which:

FIG. 1 is a sectional view schematically illustrating a film according to an exemplary embodiment of the invention;

FIG. 2 is a sectional view schematically illustrating a film according to an exemplary embodiment of the invention;

FIG. 3 is a sectional view schematically illustrating a film according to an exemplary embodiment of the invention;

FIG. 4 is a sectional view schematically illustrating a film according to an exemplary embodiment of the invention;

FIG. 5 is a sectional view schematically illustrating a film according to an exemplary embodiment of the invention;

FIG. 6 is a sectional view of a coater 10 using a slot die 13 according to the invention;

FIG. 7A is a sectional view of the slot die 13 according to the invention, and FIG. 7B is a sectional view of a conventional slot die 30;

FIG. 8 is a perspective view illustrating the slot die and the periphery thereof in a coating process according to the invention;

FIG. 9 is a sectional view illustrating a depressurizing chamber 40 and a web W adjacent to each other (where a back plate 40a forms a body along with a chamber r40 body);

FIG. 10 is a sectional view of an antireflection film for explaining a method of regulating of the film surface;

FIG. 11 is a sectional view of an antireflection film for explaining a method of regulating of the film surface; and

FIG. 12 is a sectional view of an antireflection film for explaining a method of regulating of the film surface.

Claims

1. An antireflection film comprising: a transparent support; at least one hard coat layer; and a low refractive index layer having a refractive index of 1.47 or less, the low refractive index layer being an uppermost layer of the antireflection film, wherein the antireflection film has a center-line average roughness Ra of 0.03 μm or more, and the antireflection film satisfies Expression (1): B−A<4Ra   (1)

2. The antireflection film of claim 1, which has an internal haze of less than 36% .

3. The antireflection film of claim 1, wherein the hard coat layer has a thickness of 5 to 35 μm.

4. A polarizing plate comprising: a polarizer; and two protective films, wherein at least one of the two polarizing plate is an antireflection film of claim 1.

5. An image display comprising an antireflection film of claim 1 as an outermost layer of the image display.

6. The image display of claim 5, which is a television having a size of 32 inches or more.