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OPTICAL IMAGING PEN WITH DISPLACEMENT DETECTION CIRCUITRY

  • US 20090032313A1
  • Filed: 10/06/2008
  • Published: 02/05/2009
  • Est. Priority Date: 05/25/1999
  • Status: Abandoned Application
First Claim
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1. An optical imaging pen configured to detect information encoded with infrared ink on a page, said pen comprising:

  • a housing;

    an ink pen cartridge and a stylus mounted side by side in the housing, the ink cartridge and stylus configured to be individually brought forward through an open end of the housing by rotation of a pen top rotatably mounted on an end of the housing;

    an infrared LED in the housing for providing infrared radiation for projection onto the page;

    an image sensor for receiving reflected radiation from the surface; and

    a controller for controlling operation of the LED and sensor, the controller having a force sensor photodiode configured to detect displacement of the stylus to enable a determination of a force being applied to a nib of either the cartridge or stylus, the controller having analog-to-digital converter circuitry for converting analog signals from the force sensor diode into digital signals capable of encoded transmission.

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