The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1994
Filed:
Oct. 29, 1991
Yee-Ming Chung, South Pasadena, CA (US);
Olive Tree Technology, Inc., , CA (US);
Abstract
Apparatus for generating a pixel clock to control the timing of data pulses in an optical scanning device. A VCO is utilized to generate the pixel clock. The control voltage for the VCO is provided by a digital-to-analog converter ('DAC') which converts the count generated by a pixel reference location counter driven by a reference clock. The output of the DAC is fed back as the reference voltage for the DAC. The effect is to either increase or decrease the DAC reference voltage depending on whether positive or negative feedback is implemented, thereby varying the pixel clock frequency for the image data stream as a function of pixel position. By selecting the appropriate feedback and feedback gain, the pixel placement can be made uniform across the scan line.