Focusing screen and method of manufacturing same
First Claim
1. In a focusing screen having of a multitude of micro-lens-like curved surfaces arranged on a given plane, wherein the improvement comprises:
- (a) that the arrangement pitch P of said multitude of micro-lens-like curved surfaces is a value which is in the range;
space="preserve" listing-type="equation">8 μ
m≦
P≦
30 μ
m(b) that the projection of the vertex of each of said multitude of micro-lens-like curved surfaces onto said plane is positioned at a periodical lattice point having plane coordinates (X, Y) determined from the following equations by using said pitch P and a pair of integers (I, J);
##EQU2## (c) that the distance between the vertex of each of said multitude of micro-lens-like curved surfaces and said plane varies within a certain variation range, which can be expressed as;
P×
H (μ
m), where H is a constant determined within the following range;
1 Assignment
0 Petitions
Accused Products
Abstract
A focusing screen of the type composed of a multitude of micro-lens-like curved surfaces arranged on a given plane is substantially regular in terms of their two-dimensional arrangement on the above-mentioned plane but exhibits some variation in terms of the height of the microscopic surface roughness formed by the micro-lens-like curved surfaces. The variation range is determined in correspondence with the pitch of the above-mentioned two-dimensional arrangement. Also disclosed is a method of manufacturing a focusing screen exhibiting an appropriate degree of randomness in terms of its surface configuration.
52 Citations
8 Claims
-
1. In a focusing screen having of a multitude of micro-lens-like curved surfaces arranged on a given plane, wherein the improvement comprises:
-
(a) that the arrangement pitch P of said multitude of micro-lens-like curved surfaces is a value which is in the range;
space="preserve" listing-type="equation">8 μ
m≦
P≦
30 μ
m(b) that the projection of the vertex of each of said multitude of micro-lens-like curved surfaces onto said plane is positioned at a periodical lattice point having plane coordinates (X, Y) determined from the following equations by using said pitch P and a pair of integers (I, J);
##EQU2## (c) that the distance between the vertex of each of said multitude of micro-lens-like curved surfaces and said plane varies within a certain variation range, which can be expressed as;
P×
H (μ
m), where H is a constant determined within the following range; - View Dependent Claims (3, 5, 6, 7, 8)
-
-
2. 01≦
- H≦
0.1.
- H≦
-
4. 015≦
- H≦
0.08.
- H≦
Specification