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Electronic pen with retractable and replaceable cartridge

  • US 20090315864A1
  • Filed: 06/03/2009
  • Published: 12/24/2009
  • Est. Priority Date: 06/23/2008
  • Status: Active Grant
First Claim
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1. An electronic pen comprising:

  • a user-replaceable cartridge having a nib at a first end and an opposite second end;

    a force sensor for sensing a nib force transmitted axially through said cartridge from said nib;

    a retraction mechanism comprising;

    a barrel for receiving said second end of said cartridge, said barrel being adapted for seating said cartridge in either an extended position or a retracted position, said barrel being engaged with said force sensor; and

    a first biasing means for biasing said cartridge towards said extended or retracted positions; and

    a second biasing means for biasing said barrel towards engagement with said force sensor.

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