Electrical sensing writing pen
First Claim
Patent Images
1. A sensing device for sensing an electrostatic field comprising:
- a pick-up element, having an extended body portion and a tip portion for sensing and re-radiating said electrostatic field;
coupling means capacitively coupled to and surrounding a substantial portion of said body portion of said pick-up element to receive said re-radiated signal;
said coupling means generating a corresponding signal;
housing means for enclosing a substantial portion of said pick-up element and all of said coupling means, andamplifying means directly connected to said coupling means for amplifying said corresponding signal.
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Abstract
A writing pen capacitively detects and amplifies signals generated by a writing table that produces a varying electrostatic field near its writing surface. The pen cartridge, which senses the signal, is capacitively coupled to a concentric electrode, from which the signal which has been detected may be obtained for amplification.
21 Citations
14 Claims
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1. A sensing device for sensing an electrostatic field comprising:
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a pick-up element, having an extended body portion and a tip portion for sensing and re-radiating said electrostatic field; coupling means capacitively coupled to and surrounding a substantial portion of said body portion of said pick-up element to receive said re-radiated signal;
said coupling means generating a corresponding signal;housing means for enclosing a substantial portion of said pick-up element and all of said coupling means, and amplifying means directly connected to said coupling means for amplifying said corresponding signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A writing pen capable of sensing an electrostatic field near its writing tip comprising:
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(a) a writing tip for sensing said electrostatic field; (b) a cylindrical member electrically coupled to said writing tip for re-radiating the electrostatic field sensed by said writing tip, said member having an outer surface; (c) a tubular member coaxially surrounding said cylindrical member so as to capacitively couple the re-radiated electrostatic field from the tubular member to the cylindrical member; (d) electronic amplification means coupled adjacent said outer surface of said cylindrical member, said amplification means electrically coupled to said cylindrical member, and adapted to electronically amplify the signal induced by the coupled electrostatic field; (e) housing means operable for electrostatically shielding said cylindrical member, said tubular means and said amplification means and for exposing said writing tip to said electrostatic field. (f) switch means comprising a light emitting source and a light detecting means, said switch means disposed within said housing means such that some part of said cylindrical member will, upon inward axial displacement of said cylindrical member, obstruct the passage of light from said source to said detecting means and thereby provide electrical indication that said writing pen is operable, while upon outward axial displacement of said cylindrial member, light from said source will impinge upon said detecting means and thereby provide electrical indication that said writing pen is not operable. - View Dependent Claims (12, 13, 14)
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Specification