Title:
OBTAINING UNIFORM DISTRIBUTION OF ILLUMINATION OF IMAGE FOR PROJECTOR
Document Type and Number:
Japanese Patent JPS52119321
Kind Code:
A
Abstract:
PURPOSE: To render the distribution of illumination on the image to be uniform in the system consisting of light condensing and focusing optical system by constituting a single lens of the optical system of a light absorbing glass, and reducing the thickness of the lens from its center to its circumference.
Inventors:
KAWAMURA ATSUSHI
OGURA YUKIO
OGURA YUKIO
Application Number:
JP3569576A
Publication Date:
October 06, 1977
Filing Date:
March 31, 1976
Export Citation:
Assignee:
RICOH KK
International Classes:
G02B27/18; G02B3/00; (IPC1-7): G02B3/00