Controlling scrolls of a screen image
 The present invention discloses a pointing device for scrolling a screen image. The pointing device comprises a chassis, a housing having an opening on its top mounted on the chassis, a vertical sensor installed on the chassis below the opening, a plurality of horizontal sensors installed on the chassis beside the vertical sensor, and a control stick vertically installed inside the opening of the housing comprising a top end and a bottom end. The bottom end of the control stick is in contact with the vertical sensor whereas the top end of the control stick protrudes from the opening of the housing and can be horizontally moved within a predetermined angle with respect to the bottom end of the control stick serving as its center. The pointing device further comprises a plate horizontally installed at the bottom end of the control stick with its bottom side positioned above the horizontal sensors. Horizontal movement of the top end of the control stick will cause corresponding movement of the plate which then causes the bottom surface of the plate to trigger at least one horizontal sensor. The pointing device also comprises a control device electrically connected to the vertical and horizontal sensors for detecting vertical movements of the control stick using the vertical sensor and generating correspondent vertical signals, and detecting horizontal movements of the control stick using the horizontal sensors and generating correspondent horizontal signals. 
Primax Electronics Ltd.
G G
G06F G06F
inventional inventional
Shu-Ming Chen-Ming Han Che Hong-Che
Liu Chang Wang Yen