Device for controlling the motion of a video-screen cursor

Details Device for controlling the motion of a video-screen cursor Device for controlling the motion of a video-screen cursor

1987-10-22

1989-01-31

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

273148B, G09G 302

Patent

active

048019313

ABSTRACT:
A trackball for controlling the motion of a video-screen cursor comprises a control ball, said control ball being held on at least two rotatable rolling bodies, said rolling bodies each touching the control ball at at least two contact points. These rolling bodies may, for example, have the shape of a double cone or of two spheres mounted on a shaft. The result is that, once imparted rotary momentum in an initial direction, the control ball retains momentum in that direction, i.e., the video-screen cursor moves in a precisely vertical or precisely horizontal direction across the video screen once it is started in such a direction. Furthermore, in a preferred embodiment, the axial bearing arrangement of the rolling bodies is dispensed with.

REFERENCES:
patent: 3269190 (1966-08-01), Laman
patent: 3272025 (1966-09-01), Stieber
patent: 3398592 (1968-08-01), Brany
patent: 3613090 (1971-10-01), Mason
patent: 4505165 (1985-03-01), Wiczer
patent: 4538476 (1985-09-01), Luque
patent: 4562347 (1985-12-01), Hovey et al.
patent: 4575086 (1986-03-01), Kim et al.
patent: 4581609 (1986-04-01), Hosogoe et al.
patent: 4700581 (1987-10-01), Tibbals, Jr.

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