Browse Prior Art Database

Improved Electronic Stylus for a Resistive Decoding Graphics Digitizer Tablet

IP.com Disclosure Number: IPCOM000038805D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Bertha, J: AUTHOR [+3]

Abstract

Described is an improved stylus design for an input device that uses resistive decoding technology (RDT). Such technology utilizes a graphics tablet or digitizer to enter position information for further storage, manipulation and display by a computer. The stylus must feel comfortable in the hand, and it must function well. This disclosed stylus design is unique in that it contains all the electronics (amplifier circuitry) and switch assembly in a package design that provides the necessary grounding and shielding to minimize spurious noise and effects by magnetic fields. The figure illustrates the design and components of the disclosed stylus.

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Improved Electronic Stylus for a Resistive Decoding Graphics Digitizer Tablet

Described is an improved stylus design for an input device that uses resistive decoding technology (RDT). Such technology utilizes a graphics tablet or digitizer to enter position information for further storage, manipulation and display by a computer. The stylus must feel comfortable in the hand, and it must function well. This disclosed stylus design is unique in that it contains all the electronics (amplifier circuitry) and switch assembly in a package design that provides the necessary grounding and shielding to minimize spurious noise and effects by magnetic fields. The figure illustrates the design and components of the disclosed stylus. The design improvements that improve the functionality of the stylus are as follows: The tip 10 of the stylus pen-like insert is insulated using a PVC covering -- a dielectric over metal. The pen-like insert 12 capacitively couples the signal from the tablet (not shown) to a cable 22. The insert 12 is isolated from the housing assembly 14 of the stylus using a dielectric material. The amplification circuit board 16 and switch assembly 18 are also covered using a dielectric material. The signal is designed to travel via the stylus insert 12 to the amplification circuitry 16 using a conductive coil 20 to absorb movement of the stylus insert as the switch is activated and deactivated.

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