Method and system for improved raster output scan control in an electrophotographic system
AssigneeXerox Corporation
InventorMostafa Yazdy
Life of this patent
Estimating the term…
Abstract
An improved ROS driver circuit for an electrophotographic printing system includes a sub-pixel clock generator, a parallel to serial converter, and a raster output scanner (ROS) light source. The sub-pixel clock generator generates a sub-pixel clock signal that has a period less than a period of a video data clock and this clock signal is used by the parallel to serial converter to convert a parallel video data stream into a serial video data bit stream. The serial video data bit stream modulates the ROS light source to provide sub-pixel control of the light signal generated by the ROS light source.
Claims25
An improved ROS driver circuit comprising:
- a sub-pixel clock generator for generating a sub-pixel clock signal that has a period less than a period of a video data clock;
- a parallel to serial converter for converting a parallel video data stream into a serial video data bit stream, the parallel to serial converter being coupled to the sub-pixel clock signal for serially outputting the video data bit stream;
- and
- a raster output scanner (ROS) light source coupled to the output of the parallel to serial converter for sub-pixel control of a light signal generated by the ROS light source.
An improved method for driving a raster output scanner comprising:
- generating a sub-pixel clock signal that has a period less than a period of a video data clock;
- converting a parallel video data stream into a serial video data bit stream,
- serially outputting the video data bit stream in synchronization with the sub-pixel clock;
- and
- modulating a raster output scanner (ROS) light source with the video data bit stream for sub-pixel control of a light signal generated by the ROS light source.
An electrophotographic system for reproducing images on media comprising:
- a photoconductive belt coupled by rollers to a motor for rotation of the belt in an electrophotographic system;
- a charging station for charging a portion of the photoconductive belt to a relatively high, substantially uniform potential;
- an image data buffer for receiving parallel image data;
- an raster output scanner (ROS) driver for converting the parallel image data to a serial image data bit stream in synchronization with a sub-pixel clock signal;
- an ROS light source modulated by the serial image data bit stream to generate a light directed to the charged portion of the photoconductive belt to form a latent image on the photoconductive belt corresponding to the parallel image data used to generate the serial data bit stream;
- a development station for developing a toner image corresponding to the latent image formed on the photoconductive belt;
- a transfer station for transferring the developed toner image from the photoconductive belt onto a media sheet;
- and
- a fusing station for permanently affixing the transferred toner image to the media sheet.
Dependencies are inferred from the claim text.