Patent Number: 6,166,821

Title: Self calibrating pulse width modulator for use in electrostatic printing applications

Abstract: An arrangement for producing a variable width pulse is disclosed for use in an electrostatic printing mechanism which is adapted to produce grayscale intensity of a pixel to be printed based on predetermined digital data. The variable width pulse is formed during a clock interval which is established by a clock signal such that the width of the pulse during the clock interval is based on the digital data and corresponds to a grayscale intensity of the pixel to be printed. The arrangement includes at least a first delay line including an input, an output and a plurality of cells serially connected therebetween such that a digital signal received by the input propagates from the input to the output through the cells. Each cell includes a cell output for indication of the present state of digital data contained in the cell. A pulse generating section then provides the clock signal, as the digital signal, to the input of the first delay line such that the clock signal propagates through the first delay line. Thereafter, a processing section reads the cell output of a first one of the cells at a first position on the first delay line and then reads the cell output of a second one of the cells at a second, subsequent position on the first delay line to form the variable width pulse width having a width defined as the propagation time of the clock signal from the first position to the second position on the first delay line.

Inventors: Blumer; Marc (Belmont, CA)

Assignee: Electronics for Imaging, Inc.

International Classification: H03K 7/00 (20060101); H03K 7/08 (20060101); H04N 1/405 (20060101); G06F 015/00 ()

Expiration Date: 12/26/2017