Pulsed pen for use with a digitizer tablet

Details Pulsed pen for use with a digitizer tablet Pulsed pen for use with a digitizer tablet

G - Physics

06

F

G06F 3/033 (2006.01) G06F 3/03 (2006.01)

Patent

CA 2062133

An inductive pen (16) repetitively transmits pulses of an oscillatory signal having a characterisitic frequency. Pen state information, such as pen tip contact switch information, are encoded by a number of techniques. These techniques include pulse width modulation or pulse position modulation, so as to convey pen state information to a digitizing tablet in a manner that does not adversely affect pen position determinations. The pen state information may also be encoded on the oscillating signal by Frequency Shift Keying (FSK), Phase Shift Keying (PSK), or Amplitude Modulation (AM). A digitizer tablet (10) includes circuitry for detecting the transmitted pen state information, the circuitry accommodating the selected modulation scheme. The tablet is responsive to the transmitted pulses for placing tablet circuitry in a low-power consumption state between pulses so as to conserve tablet power.

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