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IMAGE FORMING APPARATUS

  • US 20080019749A1
  • Filed: 07/30/2007
  • Published: 01/24/2008
  • Est. Priority Date: 08/26/2003
  • Status: Active Grant
First Claim
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1. An image forming apparatus, comprising:

  • a printer engine configured to form an image on a medium;

    a supply unit configured to supply the medium to the printer engine through a feed path;

    a light emitting element configured to emit light onto the medium at a predetermined position on the feed path;

    a transmitted light receiving element configured to receive transmitted light of the light emitted by the light emitting element which is transmitted through the medium;

    a reflected light receiving element configured to receive reflected light of the light emitted by the light emitting element which is reflected by the medium;

    a detecting unit which executes a detection through the emission of light and the reception of transmitted light and reflected light;

    a first determining unit which determines a characteristic of the medium based on detection signals output by the transmitted light receiving element and the reflected light receiving element as a result of the detection;

    a control unit which executes a predetermined control in the image forming apparatus based on the characteristic determined by the first determining unit; and

    a light guide member configured to guide the light emitted by the light emitting element when the medium is not present, to the reflected light receiving element.

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