Method of making tool to produce optical film
Assignee3M Innovative Properties Company
InventorsAlan B. Campbell, Sanford Cobb, Jr., Wade D. Kretman, Marvin J. Niezgocki, Timothy L. Hoopman
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Abstract
An optical film having structures that vary in height along their length where the variations have a nominal period of less than forty times the nominal height of the structures is taught. In some embodiments of the invention the variation is random.
Claims1
A method of making a tool for manufacturing an optical film, said method comprising the step of thread cutting a groove having a nominal depth and an actual depth in a metal roll with a diamond tool wherein said diamond tool is supported by a fast tool servo actuator and said fast tool servo actuator is stimulated by a random signal such that the actual depth varies continuously.
Dependencies are inferred from the claim text.