Back to results
US 2002/0158965 A1Published application
Apparatus and method for equivalently changing a write clock frequency
AssigneeRicoh Company, Ltd.
InventorHidetoshi Ema
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes a semiconductor laser that irradiates a laser beam modulated based on an image modulation signal, a scanning device that scans an image carrier with the semiconductor laser beam, and a pixel clock generating device that generates a pixel clock that controls the laser beam. The pixel clock includes a plurality of pulses having a prescribed normal width constituted by a prescribed number of fractions (N), and substantially periodically includes one or more pulses having a greater width constituted by a number of fractions of (N) plus (M).
Claims18
An image forming apparatus, comprising:
- a semiconductor laser configured to irradiate a laser beam modulated based on an image modulation signal;
- a scanning device configured to scan an image carrier with the laser beam;
- a laser beam detection device configured to detect the laser beam, said laser beam detection device being positioned beside the image carrier;
- a latent image formation device configured to form a latent image on the image carrier at a prescribed timing based on a detection signal produced by the laser beam detection device;
- a reference clock generating device configured to generate a reference clock;
- and
- a pulse modulation device configured to generate a modulation pulse constituting the image modulation signal per one pixel from the reference clock and pixel data, wherein said image modulation pulse includes at least a symmetrical thin pulse series.
4 more elements
An image forming apparatus, comprising:
- a semiconductor laser configured to irradiate a laser beam modulated based on an image modulation signal;
- a scanning device configured to scan an image carrier with the laser beam;
- a laser beam detection device configured to detect the laser beam, said laser beam detection device being positioned beside the image carrier;
- a latent image formation device configured to form a latent image on the image carrier at a prescribed timing based on a detection signal produced by the laser beam detection device;
- and
- a pixel clock generating device configured to generate a pixel clock, said pixel clock controlling the laser beam;
- wherein said pixel clock includes a plurality of pulses having a prescribed normal width constituted by a prescribed number of fractions (N), and substantially periodically includes one or more pulses constituted by a greater width than the normal width, said greater width being constituted by a number of fractions of (N) plus (M).
4 more elements
An image forming apparatus, comprising:
- means for irradiating a laser beam modulated based on an image modulation signal;
- means for scanning an image carrier with the laser beam;
- means for detecting the laser beam;
- means for forming a latent image on the image carrier at a prescribed timing based on a detection signal produced by the means for detecting;
- means for generating a reference clock;
- and
- means for generating a modulation pulse constituting the image modulation signal per one pixel from the means for generating a reference clock and pixel data, wherein said image modulation pulse includes at least a symmetrical thin pulse series.
4 more elements
An image forming apparatus, comprising:
- means for irradiating a laser beam modulated based on an image modulation signal;
- means for scanning an image carrier with the laser beam;
- means for detecting the laser beam;
- means for forming a latent image on the image carrier at a prescribed timing based on a detection signal produced by the means for detecting;
- and
- means for generating a pixel clock, said pixel clock controlling the laser beam;
- wherein said pixel clock includes a plurality of pulses having a prescribed normal width constituted by a prescribed number of fractions (N), and substantially periodically includes one or more pulses constituted by a greater width than the normal width, said greater width being constituted by a number of fractions of (N) plus (M).
4 more elements
An image forming method, comprising the steps of:
- irradiating a laser beam modulated based on an image modulation signal;
- scanning an image carrier with the semiconductor laser beam;
- detecting the laser beam;
- forming a latent image on the image carrier at a prescribed timing based on a detection signal produced by the laser beam detection device;
- generating a reference clock;
- and
- generating a modulation pulse constituting the image modulation signal per one pixel from the reference clock and pixel data by including image modulation pulse having at least a symmetrical thin pulse series.
4 more elements
An image forming method, comprising the steps of:
- irradiating a laser beam modulated based on an image modulation signal;
- scanning an image carrier with the semiconductor laser beam;
- detecting the laser beam;
- forming a latent image on the image carrier at a prescribed timing based on a detection signal produced by the laser beam detection device;
- generating a pixel clock by including a plurality of pulses having a prescribed normal width constituted by a prescribed number of fractions (N) and substantially periodically including one or more pulses constituted by a greater width than the normal width, said greater width being constituted by a number of fractions of (N) plus (M);
- and
- controlling the laser beam by the pixel clock.
4 more elements
Dependencies are inferred from the claim text.