| 主权项 |
1. A pointing device for interacting with a touch-sensitive device comprising:
(a) a supporting member; (b) a first contact point fixed on the supporting member and adapted to be in contact with a touch-sensitive layer and generate a first touch point on a screen underneath the touch-sensitive layer; (c) a second contact point fixed on the supporting member and spaced laterally apart from the first contact point and adapted to be in contact with the touch-sensitive layer and generate a second touch point on the screen; and (d) a third contact point mounted on the supporting member and movable by a first actuating assembly from a default state where only the first and second contact points are in contact with the touch-sensitive layer to its fully depressed state where the third contact point is also in contact with the touch-sensitive layer adjacent to the second contact point; (e) a fourth contact point mounted on the supporting member and movable by a second actuating assembly from the default state where only the first and second contact points are in contact with the touch-sensitive layer to its fully depressed state where the fourth contact point is also in contact with the touch-sensitive layer adjacent to the second contact point; (f) wherein when the first, second and third contact points are in contact with the touch-sensitive layer, the second and third contact points are recognized as one contact point and produce a first combined touch area on the touch-sensitive layer having a first offset centre that is offset from a centre of a touch area on the touch-sensitive layer of the second contact point so that the second touch point is shifted to a first offset position in alignment with the first offset centre; (g) wherein when the first, second and fourth contact points are in contact with the touch-sensitive layer, the second and fourth contact points are recognized as one contact point and produce a second combined touch area on the touch-sensitive layer having a second offset centre that is offset from the centre of the touch area of the second contact point so that the second touch point is shifted to a second offset position in alignment with the second offset centre; and (h) wherein when the first, second, third and fourth contact points are in contact with the touch-sensitive layer, the second, third and fourth contact points are recognized as one contact point and produce a third combined touch area on the touch-sensitive layer having a third offset centre that is offset from the centre of the touch area of the second contact point so that the second touch point is shifted to a third offset position in alignment with the third offset centre. |
