Xerox Corporation

Vinod Mirchandani

Vittorio R Castelli

Ellis D Harris

Robert J Kleckner

Mark Shi Wang

Kevin E Jones

Stanley Zedekar

A single rotating polygon mirror with v-shaped facets having upper and lower reflective facet surfaces reflects and separates dual beams to two photoreceptors in a ROS. Each facet surface will have a different tilt angle. The two independently modulated beams will share common optical elements between the light sources and the mirror and may share a common f-theta scan lens. Two sets of two beams can be incident upon the facets on opposite sides of the rotating polygon mirror. The polygon mirror facet can also have three or four reflective facet surfaces to reflect and separate three or four independently modulated beams to three or four different photoreceptors.

Single rotating polygon mirror with v-shaped facets for a multiple beam ROS

There is disclosed a method of reducing banding problem in multi-diode raster scanning systems. In this invention a test mode is provided for measuring and adjusting the output power of the laser diodes. During the test mode an individual patch is used for the light beam of each diode to individually measure and adjust the output power of each laser diode. By individually adjusting the output power of each laser diode to a required level, the banding problem is substantially reduced.

Accurate laser power control for dual/multiple beams

There is disclosed a raster output scanner for a color printing system which utilizes an indexed rotating polygon mirror in order to scan each given scan line from each latent image by a given facet in order to reduce misregistration caused by facet surfaces of a rotating polygon mirror.

Raster output scanner for reducing color misregistration

A raster scanner system is disclosed which utilizes a pair of binary diffraction optic lenses to correct non-uniformity of the flux of a light beam received by a facet of a rotating polygon. Since the facet is rotating and the direction of the light is constant, the amount of the light (flux) which the facet receives in each position from the start of scan to the end of scan and in any position therebetween is different. Also, the light beam striking the rotating facet has a Gaussian distribution which is a contributor to the non-uniformity of the flux over one scan line. The binary diffraction optic lenses of this invention reprofiles the Gaussian distribution into a profile in which the intensity of the light beam gradually increases as the facet rotates to provide a uniform flux for the entire scan line.

Optimal filling of a polygon facet by beam reprofiling

An optical scanner has grease bearings between the rotor and the housing. The grease bearings are grooved which tends to pump the grease back into the bearing cups when the optical scanner is operating. The thixotropic property of the grease prevents its escape from the bearing cups when the optical scanner is not operating. The grease bearings can be frusto-conical or spherical in shape with complementary shaped bearing cups. The bearing cups, rather than the bearings, may be grooved. The bearing cups may also be stepped to provide a pumping region and a reservoir region for the grease. Pressure means within the scanner housing may force the bearing cups onto the grease bearing.

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Agoura, CA, United States of America

Vinod Mirchandani