Xerox Corporation

Jean-Michel Guerin

James M Wilson

Robert P Loce

John Richard Andrews

Patrick Yasuo Maeda

Ellis D Harris

Werner E Haas

Aron Nacman

Tibor S Fisli

Melvin E Swanberg

Michael S Cianciosi

Eugene Wilson

Erwin R Wechsler

Donald J Quant

John A Lucero

An acoustic inkjet print head with a plurality of transducers for generating acoustic waves utilizes an individual control circuit for each transducer. The transducers are responsive to their respective control circuit to oscillate at a resonance frequency, which is defined by the respective transducer, its control circuit and the glass substrate.

Acoustic ink printing integrated pixel oscillator

There is disclosed a color xerographic printing system which utilizes one full length developer to develop a first latent image and registration marks on the margins along the first latent image. The color printing system of this invention, also utilizes a second developer which only covers the second latent image created over the first latent image to prevent the developed registration marks from attracting more toner.

Image self-registration for color printer

A thin film organic light emitting diode with edge emitter waveguide comprises, in sequence, a substrate, a waveguide, an anode, a hole transport layer, an electroluminescent layer, and a cathode. Voltage applied between the anode and cathode causes the electroluminescent layer to emit light through the hole transport layer and the anode into the waveguide where the light is internally reflected within the waveguide and propagates through the length of the waveguide to be emitted through the edge of the waveguide. The non-emission edge of the waveguide may be sloped with a conductor layer to the anode and a conductor layer to the cathode forming a reflective surface to the non-emission edge.

Thin film organic light emitting diode with edge emitter waveguide

There is disclosed a vertical cavity laser diode (VCSEL) assembly with an integral set of detectors for the purpose of individually monitoring and adjusting the output power of each laser diode. A plate which has a plurality of light detectors and a plurality of apertures is bonded to a laser light source which has a plurality of VCSELs. Each aperture of the plate is aligned with a corresponding VCSEL and each light detector is electrically connected to a corresponding VCSEL.

VCSEL integral feedback assembly two-etch structure

There is disclosed a color xerographic printing system which utilizes a full length developer to develop a first latent image and registration marks on the margins along the first latent image. The color printing system of this invention, also utilizes two margin chargers prior to a second developer. Each one of the margin chargers restores the charge under the developed registration marks to prevent the registration marks from attracting more toner.

Image self-registration for color printers

A passive facet tracking system using passive optical components to induce a beam of light to track a facet of a rotating mirror polygon. The properties of the passive components are such that they collimate a light beam in a tangential plane in a complete trip through the passive optical components and the passive optical components focus the beam in the sagittal plane so that the beam is collimated in the tangential plane and focussed in the sagittal plane when it arrives at the center of the facet.

Optics for passive facet tracking

A double bounce facet tracking polygon in which a reflective mode replicated diffraction grating element on a flat facet on the double bounce facet tracking polygon is used to provide a small angle deflection which is used in a passive facet tracking system.

Double bounce passive facet tracking with a reflective diffraction

The present invention is a novel raster output scanner (ROS) configuration that employs modulated laser diodes as the light source. Each laser diode is coupled to a dedicated driver that modulates the light beam according to digital video signal data. The present invention employs a single-channel acoustic-optic cell that deflects the multiple beams to maintain proper facet tracking. A single transducer is coupled to the single-channel acoustic-optic cell that generates the necessary acoustic wave to maintain proper tracking.

High efficiency multispot facet tracked raster output scanning system

A raster output scanning system is disclosed which utilizes a single light source, an electro-optical device and a beam-splitter to generate two partially overlapping light beams in order to scan one scan line in which the width of the scan line can be adjusted electronically. The two partially overlapping light beams in effect generate a resulting light beam. By changing the polarization factor of the electro-optical device, the intensities of the two light beams can be modified which in turn will change the width of the resulting light beam and as a result the spot size changes. By changing the spot size, the width of the scan line can be adjusted. Also, by changing the polarization factor, the position of the resulting light beam can be changed.

Electro-optical device for variable scan width

A raster output scanning system is disclosed which utilizes two light beams to double scan two scan lines on a photoreceptor in order to generate three exposure levels required for a tri-level printing system. In the raster output scanner of this invention, the two light beams scan two separate scan lines. At the completion of the simultaneous scanning of two light beams when the first light beam starts to scan a new scan line, the second light beam start to scan the scan line that the first light beam just completed scanning. In this invention the first light beam generates two exposure levels and the second light beam adds additional exposure to the second exposure level in order to generate a third exposure level. The same method can be utilized to generate additional levels for printing systems with more xerographic levels than three.

Multi-level xerography exposure control through multi-beam overscan

A raster output scanning system is disclosed which utilizes a single light source, an electro-optical device and a beam-splitter to generate two light beams in order to simultaneously scan two adjacent scan lines. Two different trains of pixel information are used to control the intensity of the laser light source and the degree of the polarization of the electro-optical device in order to modulate the two light beams with two separate trains of pixel information without using a modulating device. Each of the two light beams exiting the beam-splitter is modulated in accordance with one of the two trains of pixel information.

Dual-beam scanning electro-optical device from single-beam light source

A laser diode is disclosed which utilizes a feedback system which substantially reduces the dependency of the optical output power of the laser diode on laser junction temperature which is dependent on the pixel pattern. The feedback system of this invention generates a feedback signal through comparison of an averaged train of pixel information against an averaged optical output power from the back photodiode of the laser diode. By comparing the two averaged signals, one can determine the fluctuations of the heat in the laser diode. At any given point, any discrepancy between the two averaged signals shows a temperature change in the laser diode. Depending on the amount of the difference between the two signals, the degree of excess temperature can be determined and the difference will be used for feedback correction.

Data-insensitive laser diode power control

A raster scanner is disclosed which utilizes a rotatable glass plate for compensating for scan line bow. The rotatable glass plate provides an adjustment mechanism which can shift a collimated light beam up or down in the sagittal plane to align the center ray of the light beam with the optical axis of the imaging lens of post polygon optics. When the center ray of the light beam passes over the optical axis of the imaging lens of the post polygon optic, the bow will be reduced substantially.

Ros bow compensation

In a write white color xerographic system which builds up layers of color toner on a web prior to transfer to paper, the method of generating a toner mark on the belt on the first pass by use of the scanning laser, and of detecting that mark on subsequent passes to ensure registration of the first and subsequent passes. The marks are made on the photoreceptor slightly before and after the image area to indicate the area and shape of the image area, and are used in conjunction with ordinary start and end of scan detectors which are used to determine scan speed.

Electronic color printers multiple-pass image self-registration

A multi-beam raster output scanner is disclosed which utilizes a deflection wedge for modifying the beam separation independent of the spot size to generate a desired relationship between spot separation and spot size. The beam separation can be modified by moving the deflection wedge back and forth. Depending on the distance between the deflection wedge and a spot size control aperture, the beam separation varies. In this invention, as in the prior art, the spot size can be modified by changing the size of the control aperture, but to avoid the loss of intensity, the size of the control aperture will be changed only for fine adjustments to achieve the proper spot size.

Growing community of inventors

Glendale, CA, United States of America

Jean-Michel Guerin