Focussing plate

Details Focussing plate Focussing plate

Filed on

1976-08-02

Date issued

1978-01-31

Examiner

Griffin, Donald A.

Other Related Categories

G03B 2160

Type

Patent

Status

active

Patent number

040712923

Description

ABSTRACT:
A large number of cones such as circular cones or pyramids, or conical recesses are regularly uniformly distributed and formed on a surface of a transparent focussing plate. Each cone or conical recess has a large number of fine irregularities on the sloping surface thereof to thereby diffuse the light passing through the sloping surface.

REFERENCES:
patent: 1044135 (1912-11-01), Buechner
patent: 2275602 (1942-03-01), Beck et al.
patent: 2480031 (1949-08-01), Kellogg
patent: 2589014 (1952-03-01), McLeod
patent: 3208341 (1965-09-01), Hosterman et al.
patent: 3314742 (1967-04-01), Morgan
patent: 3844644 (1974-10-01), Martinez

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