X-Y position input device for display system

Details X-Y position input device for display system X-Y position input device for display system

1985-12-12

1987-03-24

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

74471XY, 178 18, G09G 100

Patent

active

046528717

ABSTRACT:
An X-Y input device comprises a rotatable ball, a first driven roller held in contact with the rotatable ball and rotatable in response to rotation of the rotatable ball, a second driven roller held in contact with the rotatable ball and rotatable in response to rotation of the rotatable ball, the second driven roller having an axis of rotation extending substantially perpendicularly to that of the first driven roller, first rotation detector means for detecting an amount of rotation of the first driven roller, and second rotation detector means for detecting an amount of rotation of the second driven roller. The X-Y input device also includes means for imposing frictional forces between the ball and the driven rollers, stop means for stopping operation of the rotation detector means and blocking rotation of the driven rollers when the operation of the rotation detector means reaches predetermined limits, and power release means for reducing power transmitted from the ball to the rotation detector means when the operation of the rotation detector means reaches the limits.

REFERENCES:
patent: 3013441 (1961-12-01), Alexander
patent: 4404865 (1983-09-01), Kim
patent: 4464652 (1984-08-01), Lapson et al.
patent: 4612539 (1986-09-01), Hosogoe et al.

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