Back to results
US 4,066,351 AGranted
Variable illumination optical system
AssigneeXerox Corporation
InventorWayne L. Kidd
Life of this patent
Estimating the term…
Abstract
An optical system in which a screen modulates the light produced thereby. The intensity of the light image is varied as a function of screen position.
Claims4
An electrophotographic printing machine for reproducing an original document, including:
- a photoconductive member;
- means for charging at least a portion of said photoconductive member to a substantially uniform level;
- a screen member;
- means for adjusting the spacing between said screen member and said photoconductive member;
- a light source for illuminating the original document;
- a power supply coupled to said light source and applying an excitation voltage thereto;
- means, responsive to the spacing between said scren member and said photoconductive member, for controlling said power supply to regulate the voltage applied to said light source by said power supply, thereby controlling the intensity of illuminating developed by said light source;
- a lens is a light receiving relationship with the light rays transmitted from the original document to form a light image thereof;
- and
- means for directing the light image onto the charged portion of said photoconductive member to record an electrostatic latent image thereon.
7 more elements
Dependencies are inferred from the claim text.