Positioning device reporting X, Y and yaw motion

Details Positioning device reporting X, Y and yaw motion Positioning device reporting X, Y and yaw motion

Filed on

1994-07-14

Date issued

1995-12-19

Examiner

Hjerpe, Richard

Patent Class

Computer graphics processing and selective visual display system

SubClass

Display peripheral interface input device

Other Related Categories

345163, G09G 500

Type

Patent

Status

active

Patent number

054772370

Description

ABSTRACT:
A pointing device or mouse which monitors motion in both the X and Y directions as well as in the yaw or rotational direction. The pointing device hence monitors three degrees of freedom and thus provides a more accurate indication of the position of the device. One embodiment comprises a pointing device which includes two motion indicators or mouse balls integrated into the bottom of the device which detect change of motion or position in one X and two Y directions. Separate Y measurements are made for each of the respective balls because yaw or rotation of the device causes the line movements for the two balls to differ. The two balls are preferably a distance L apart, and the rotation and translation of the respective balls are measured by the change in position with reference to a center point between the two balls. The two mouse balls generate signals indicating positive or negative motion in the respective directions. A method is included which interprets these signals and generates translation and rotation vectors for use by position and orientation tracking software. This method includes a small filter which groups together pseudo-simultaneous signals in the two Y directions that differ only by a small period of time.

REFERENCES:
patent: 3320440 (1967-05-01), Reed
patent: 5162781 (1992-11-01), Cambridge
IBM Technical Disclosure Bulletin 27(6):3423-3424.

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