Browse Prior Art Database

Ball Joint Position Transducers

IP.com Disclosure Number: IPCOM000073871D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Bliss, BE: AUTHOR [+3]

Abstract

Movable ball member 1 journaled in stationary socket element 2 converts vector components of mechanical motion or displacement into electrical signal analogs. The electrical signals are then used to provide X-Y positioning of the controlled device (i.e., display cursor positioning)

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Ball Joint Position Transducers

Movable ball member 1 journaled in stationary socket element 2 converts vector components of mechanical motion or displacement into electrical signal analogs. The electrical signals are then used to provide X-Y positioning of the controlled device (i.e., display cursor positioning)

In the examples shown, two device positioning speeds are provided. In the display cursor application the high speed would be used to move the cursor across the screen and low speed to accurately position under a character. In drawings A and B, a permanent magnet 3 encased in the member 1 interacts with sensors 4a, 4b on the socket element. Sensors 4a (e.g. magnetodiodes) provide slow rates or motion. Sensors 4b provide fast movements.

Examples of electro-optic coupling are illustrated in C and D. In C the member 1 contains a reflective surface 5 to direct light from source 6 to sensors 7 (e.g. photodiodes). In D, the member 1 houses the light source 8 and contains one or more apertures 9 to selectively illuminate sensors 10 (e.g. photodiodes). In the example shown at E, a small pool of mercury 12 in the member 1 selectively completes electrical conduction paths between sensors 14 (e.g. embedded contacts) in accordance with the position of member 1.

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