Patent ID: 7057601

Claim:
A thin pointing apparatus, comprising: a base; a rotary disk, being pivotally connected to the base and forming a pivotal connecting part; and a circuit board, being associated with the base with a central hole thereof being passed through by the pivotal connecting part; wherein the circuit board further comprises a microprocessor; at least two conductive annular rails, being arranged sequentially and connected to the microprocessor; and two photo-interrupters, being connected to the microprocessor; and the rotary disk further comprises at least one conductive plate, being disposed at a lower side of the rotary disk and the at least one conductive plate spacing apart an equivalent angle each other corresponding to the annular rails, which are disposed underneath the rotary disk, being able to touch the two conductive annular rails during being pressed by a user from an upper side thereof; and a first photo interruption set, being arranged annularly with a plurality of equidistant photo interrupting stripes and the photo interrupting stripes being above and corresponding to the two photo-interrupters.