Method and apparatus for quantitatively evaluating scintillation, antiglare film and method of producing the same
A method capable of quantitatively evaluating the intensity of scintillation caused by surface unevenness. Light from a white light source is made incident on a surface of an object to be measured through a matrix filter. Reflected light or transmitted light from the object is photographed with a CCD camera and taken into a computer as data. Image processing for the luminance distribution of the captured light is performed to obtain a standard deviation of dispersion of the luminance distribution. The value of the standard deviation obtained is defined as a scintillation value of the surface of the object. The performance of the object is evaluated by judging whether or not the scintillation value is greater than a predetermined value
1. An antiglare film having an antiglare layer formed on at least one surface of a base, said antiglare film formed by a method comprising the steps of:
making light from a white light source incident on a surface of the antiglare film through a matrix filter;
photographing reflected light or transmitted light from said antiglare film with a photographing device and capturing the light as data; and
forming said antiglare film so that a scintillation value is greater than zero and not greater than 15 when a standard deviation of a luminance distribution of a captured light is defined as a scintillation value of the surface of said antiglare film and measurement is made at a mean luminance of 145 cd/m 2 of a captured image.
2. An antiglare film as claimed in claim 1 , wherein the film has Sm of 23.7 to 30.2, where Sm is a numerical value expressed in units of micrometers which represents distance between adjacent valleys of surface unevenness.