Focusing screen including different height microlenses arranged in a cyclical pattern
First Claim
1. In a focusing screen having a large number of microlenses regularly distributed in an array, the improvement wherein said microlenses are substantially uniformly cross-dimensioned and arranged as a plurality of intermingled groups, with the microlenses of each group having a predetermined height different from that of the microlenses of each other group and occupying a respective cyclical pattern of positions within said array.
1 Assignment
0 Petitions
Accused Products
Abstract
In a focusing screen having a large number of microlenses regularly arranged thereon, heights of microlenses are n different values. The microlenses having the same height are cyclically arranged. In another aspect, the heights of the microlenses in a similar focusing screen are randomly distributed over ranges centered on n central values, and the microlenses having the same central value are cyclically arranged. In still another aspect, in a method of manufacturing a focusing screen having micropatterned projections by a so-called proximity exposure method, dimensions of the micropatterns of the mask vary centered on the n different values, and the micropatterns having the same central values are cyclically arranged.
-
Citations
8 Claims
-
1. In a focusing screen having a large number of microlenses regularly distributed in an array, the improvement wherein said microlenses are substantially uniformly cross-dimensioned and arranged as a plurality of intermingled groups, with the microlenses of each group having a predetermined height different from that of the microlenses of each other group and occupying a respective cyclical pattern of positions within said array.
- 2. In a focusing screen having a large number of microlenses regularly distributed in an array, the improvement wherein said microlenses are arranged as a plurality of intermingled groups, with the microlenses of each group having heights which are randomly distributed within a predetermined range about a predetermined central height value, the central height value being different for each group, and the microlenses of each group occupying a respective cyclical pattern of positions within said array.
Specification