Patent ID: 7973817
Filing Date: 2011-07-05
Classification: G06K,H04N

Abstract:
1. A pixel clock and pulse-modulation-signal generating device comprising: a high-frequency-clock generating unit that generates a high-frequency clock; a pixel control data generating unit configured to generate pixel control data that specifies a pixel length to correct fluctuation in a scan width of a scan optical system; a modulation-data generating unit configured to generate, based on the pixel control data, phase data that indicates a phase shift amount of a pixel clock, generate modulation data that indicates a desired bit pattern that corresponds to image data, and change a length of the modulation data based on the pixel control data; a pixel-clock generating unit configured to generate the pixel clock based on the high-frequency clock, the phase data, and a horizontal synchronization signal; and a serial-modulation-signal generating unit configured to receive the modulation data, and output a pulse modulation signal in a serial pulse string based on the pixel clock and the high-frequency clock, the serial pulse string having a length corresponding to the phase shift amount of the pixel clock indicated by the phase data.