Patent ID: 7637025

Claim:
An apparatus for measuring a thickness of a lens, the lens having a first surface and a second surface facing away from the first surface, the apparatus comprising: a plurality of first touch heads each having a first curved contact surface for coming into contact with the first surface of the lens, the first curved contact surfaces of the first touch heads having different curvatures for being selectively mated with the first surface of the lens; a base for selectively mounting one of the first touch heads thereon; a plurality of second touch heads each having a second curved contact surface for coming into contact with the second surface of the lens, the second curved contact surfaces of the second touch heads having different curvatures for being selectively mated with the second surface of the lens; a driving mechanism for selectively mounting one of the second touch heads thereon, the driving mechanism configured for driving the mounted second touch head to move relative to the mounted first touch head, the second curved contact surface of the mounted second touch head facing toward the first curved contact surface of the mounted first touch head.