INTERMEDIATE BASE MATERIAL FILM AND TOUCH PANEL SENSOR

摘要

There is provided an intermediate base material film including: a transparent base material; a transparent layer having a refractive index of from 1.47 to 1.57 and a film thickness of 1 μm or more; a high-refractive-index layer having a refractive index of from 1.62 to 1.72 and a film thickness of from 20 nm to 80 nm; and a low-refractive-index layer having a refractive index of from 1.44 to 1.54 and a film thickness from of 3 nm to 45 nm, wherein when the intermediate base material film is irradiated with light to determine a* and b* values in a L*a*b* color system from reflected light toward each regular reflection direction, a variation of the a* values is 1.0 or less, and a variation of the b* values is 1.6 or less.

主权项

1. A method of suppressing a variation of tints in a touch panel sensor comprising an intermediate substrate film for supporting a conductive layer subjected to patterning, the method comprising:
providing an intermediate substrate film comprising
a transparent substrate,a first layer that is layered on one surface of the transparent substrate, anda second layer that is layered on the first layer and which has a lower refractive index than a refractive index of the first layer; wherein when the intermediate substrate film is irradiated with light from the second layer side while an incidence angle is varied every five degrees in a range of 0° or more and 75° or less, assuming that a normal direction of a surface of the intermediate substrate film is 0°, to determine a* and b* values in a L*a*b* color system from reflected light toward each regular reflection direction, a variation of the a* value is 1.0 or less, and a variation of the b* value is 1.6 or less.