Position indicating apparatus for use in a digitizing tablet system
First Claim
1. A position indicating implement comprising:
- a first coil;
an alternating current power source connected to said first coil to produce a current in said first coil;
a second coil positioned so as to be inductively coupled with said first coil; and
a capacitor connected in series with said second coil so that the current in said first coil induces a phase shifted current in said second coil.
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0 Petitions
Accused Products
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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Citations
34 Claims
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1. A position indicating implement comprising:
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a first coil; an alternating current power source connected to said first coil to produce a current in said first coil; a second coil positioned so as to be inductively coupled with said first coil; and a capacitor connected in series with said second coil so that the current in said first coil induces a phase shifted current in said second coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A position indicating implement comprising:
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a first coil having a first alternating current passing through it; a second coil having a second alternating current distinguishable from said first alternating current passing through it; a barrel which houses said and second coils; a tip extending from one end of said barrel for placement on and movement over a digitizing tablet; and a switch mounted on said barrel so that it is easily accessible to a user'"'"'s finger near said tip for producing a signal upon activation by said finger, said signal causing said implement to operate as a mouse, so that said implement indicates relative position rather than absolute position. - View Dependent Claims (17, 18)
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19. A position indicating implement comprising:
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a first coil; digital switch means for producing a step function approximating a sine wave, said step function lacking components at the second, third, fourth, fifth and sixth harmonics; means for filtering said step functions to produce a sine wave which is delivered to said first coil; and a second coil having a current distinguishable from the current in said first coil. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A position indicating implement comprising:
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a first coil; digital switch means for producing a step function approximating a sine wave, said step function lacking components at the second, third, fourth, fifth, and sixth harmonics; means for filtering said step function to produce a sine wave which is delivered to said first coil; a second coil positioned so as to be inductively coupled with said first coil; a capacitor connected in series with said second coil so that said current in said first coil induces a phase shifted current in said second coil; a barrel for housing said first and second coils and said capacitor; a tip extending from one end of said barrel for placement on and movement over a digitizing tablet; and a mouse switch near said tip so that it may be easily activated by the finger of a user holding said barrel, activation of said switch producing a mouse signal which causes said implement to operate as a mouse so that it indicates relative direction rather than absolute position. - View Dependent Claims (32, 33, 34)
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Specification