Telegraphy – Systems – Position coordinate determination for writing
Patent
1984-11-16
1987-01-20
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
046381198
ABSTRACT:
A position indicating implement is disclosed having a first coil connected to a current source and a second coil inductively coupled with the first coil. A capacitor is connected in series with the second coil so that the current in the first coil induces a phase shifted current in the second coil. A tip extends from the barrel of the position indicating implement of the present invention. The tip is designed for placement on and movement over a digitizing tablet. A switch has been located near the tip so that it is easily accessible to a user's finger while holding the implement.
The power source providing an alternating current to the first coil includes a digital switching circuit for producing a step function which approximates a sine wave and lacks any components at the second, third, fourth, fifth and sixth harmonics. The step function is filtered to produce a sine wave for delivery to the first coil. The switch near the tip of the implement may be used as a mouse switch so that the position indicating implement may be used as a mouse to indicate relative position rather than absolute position. Remote signaling may be accomplished by providing a switch in the circuit of the second coil. Calibration of the phase shift between the fields of the two coils may be accomplished by providing a line from the circuit of the second coil.
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Blesser Barry A.
Prentice Thomas C.
Asher Robert M.
O'Connell Robert F.
Pencept, Inc.
Schreyer Stafford D.
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