Generation Of Precision Pixel Clock In Laser Printers And Scanners

Gerald Toyen

doi:10.1117/12.954931

10 January 1977 Generation Of Precision Pixel Clock In Laser Printers And Scanners

Gerald Toyen

Proceedings Volume 0084, Laser Scanning Components and Techniques: Design Considerations/Trends; (1977) https://doi.org/10.1117/12.954931
Event: 20th Annual Technical Symposium, 1976, San Diego, United States

Abstract

A new method of generating a pixel clock which can achieve fractional pixel registration across the entire film format without the need for precision servo control of the spinner motor is described. This method utilizes an auxiliary laser beam in parallel with the main writing/scanning beam. A description of several classical methods of generating precision pixel clocks for use with laser printers and laser scanners is included. The pixel placement accuracy achievable with each method is discussed along with advantages and limitations of each method. The auxiliary beam of the new method is first diverted from the writing beam just prior to its impinging the film and is then passed through an optical ruling. The modulated auxiliary beam is then collected on a photodetector. The resulting signal from the photodetector is used as a reference signal to which the pixel clock is phase locked. Generating the pixel clock in this manner not only produces accurate line-to-line pixel registration along the line, which is independent of perturbation in the scanner rotation, but also corrects for geometric distortions along the line length caused by the lens system.

Citation Download Citation

Gerald Toyen "Generation Of Precision Pixel Clock In Laser Printers And Scanners", Proc. SPIE 0084, Laser Scanning Components and Techniques: Design Considerations/Trends, (10 January 1977); https://doi.org/10.1117/12.954931

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