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Pointing device with solid-state roller

  • US 8,633,893 B2
  • Filed: 01/10/2013
  • Issued: 01/21/2014
  • Est. Priority Date: 12/22/2000
  • Status: Expired due to Term
First Claim
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1. A pointing device comprising:

  • a housing;

    a pointing sensor disposed in the housing, for detecting a physical displacement of the pointing device;

    a stationary scrolling sensor disposed in the housing, wherein the stationary scrolling sensor comprises;

    a plurality of discrete electrodes including a first electrode and a second electrode; and

    a capacitive sensing circuit; and

    a processor coupled to the capacitive sensing circuit, wherein the processor is operable to;

    detect a first contact between a user'"'"'s finger and the first electrode;

    detect a second contact between the user'"'"'s finger and the second electrode;

    wherein detecting the first contact or detecting the second contact further comprises detecting that a time to discharge a capacitance is longer than a reference time value;

    determine that a delay between the first contact and the second contact is less than a predetermined time period; and

    provide a scrolling command; and

    a transmitter disposed in the housing, configured to transmit the physical displacement and the scrolling command from the pointing device to a host device.

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