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Four button cursor and method for digitizing tablet

  • US 4,748,295 A
  • Filed: 01/23/1987
  • Issued: 05/31/1988
  • Est. Priority Date: 04/03/1985
  • Status: Expired due to Term
First Claim
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1. A cursor for use in digitizing points along a digitizing surface of a digitizer, the cursor comprising in combination:

  • (a) bottom surface means for sliding the cursor smoothly along the digitizing surface;

    (b) housing means attached to the bottom surface means and grippable by a hand of an operator for enabling the operator to hold and operate the cursor;

    (c) alignment indicia means attached in fixed relationship to the housing means for enabling the operator to visually align the cursor with the points to be digitized;

    (d) non-directional antenna means attached in fixed relationship to the alignment indicia means for transmitting an antenna signal to the digitizing surface substantially independently of the rotational orientation of the cursor about an axis perpendicular to the plane of the digitizing surface when the bottom surface means rests on the digitizing surface; and

    (e) means for producing the antenna signal on the antenna means in response to pressure applied to the cursor by the hand of the operator, wherein the antenna signal producing means includei. circuit means for producing a plurality of different frequency signals,ii. means responsive to the signals produced by the circuit means for producing the antenna signal,iii. a plurality of switch buttons arranged around a post,iv. a plurality of control switches corresponding to the switch buttons, respectively, connected to the circuit means for causing the circuit means for produce a signal having a frequency determined by the states of the control switches.

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