Pressure sensitive pointing device for transmitting signals to a tablet
First Claim
Patent Images
1. A pressure sensitive pen for transmitting signals to a tablet comprising:
- (a) a stylus mounted within a carrier for limited axial movement and extending therefrom for contact with a surface;
(b) switch means responsive to a first predetermined axial force applied to said stylus for generating a pen down signal; and
(c) modulating means having a variable reluctance responsive to axial forces exceeding a second predetermined axial force larger than said first predetermined axial force for varying said reluctance and for modulating transmitted signals in proportion to said axial forces exceeding said second predetermined axial force.
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Abstract
A pressure sensitive pointing device or pen is described for use with an electronic tablet that determines the position of the pointing device on the surface of the tablet. The pointing device incorporates a variable reluctance circuit responsive to the force exerted on the pen point for modulating a radiating frequency, emanating from the pen, in proportion to the force.
190 Citations
16 Claims
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1. A pressure sensitive pen for transmitting signals to a tablet comprising:
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(a) a stylus mounted within a carrier for limited axial movement and extending therefrom for contact with a surface; (b) switch means responsive to a first predetermined axial force applied to said stylus for generating a pen down signal; and (c) modulating means having a variable reluctance responsive to axial forces exceeding a second predetermined axial force larger than said first predetermined axial force for varying said reluctance and for modulating transmitted signals in proportion to said axial forces exceeding said second predetermined axial force. - View Dependent Claims (2, 3, 4)
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5. In a pressure sensitive pen having an oscillator therein for transmitting signals to a receiving tablet, the improvement comprising:
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(a) a stylus mounted within a carrier for limited axial movement in response to axial forces applied to said stylus; (b) a ferrite core having a first portion secured to said carrier and a second portion mounted for axial movement with said stylus, said axial movement changing an air gap between said first and second portions; and (c) a winding in said ferrite core connected in parallel with a tank circuit of said oscillator wherein axial movement of said stylus changes said air gap and modifies the frequency of the signal being transmitted by said pressure sensitive pen. - View Dependent Claims (6, 7, 8)
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9. A pressure sensitive pen for transmitting signals to a tablet comprising:
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(a) a stylus mounted within a carrier for limited axial movement and extending therefrom for contact with a surface; (b) switch means responsive to axial movement of said stylus for providing a pen down signal; (c) an actuating rod mounted in said carrier and positioned to receive axial forces from said stylus; (d) an oscillator mounted in said carrier and having a tank circuit for determining frequency of the signals transmitted by said pressure sensitive pen; and (e) a variable reluctance means mounted in said carrier connected to said tank circuit and responsive to axial forces received by said actuating rod from said stylus for changing its reluctance in response to changes in said force and to thereby modify the frequency of the signals transmitted by said pressure sensitive pen. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification