Patent ID: 8544920
Filing Date: 2013-10-01
Classification: H01L

Abstract:
1. A robot arm for delivering a wafer comprising: a carrier plate; an inner ring disposed on the carrier plate and defining at least a through-hole; a driving device connected to the carrier plate to move the carrier plate; and at least a contact pad disposed in the through-hole of the inner ring and comprising: a first protrusion portion protruding from a first surface of the inner ring toward a first direction, having a top surface being a curved surface and used for being in contact with the wafer to prevent the wafer from being in contact with the first surface; and a second protrusion portion lodged in the through-hole to fix the contact pad at the inner ring, having a bottom surface being a curved surface and protruding toward a second direction opposite the first direction, wherein a hardness of the contact pad is at least about 38 HS, and a material of the contact pad comprises at least silicone, wherein the inner ring comprises a convex rib disposed on a well of the inner ring defining the through-hole so that the through-hole are formed as comprising a first hole, a second hole and a communication hole, wherein a location of the communication hole corresponds to a location of the convex rib and the communication hole is in communication with both the first hole and the second hole; and the second protrusion portion of the contact pad is protruded from a bottom surface of the convex rib so that the second protrusion portion is lodged at the convex rib, the contact pad further comprises: a first embedded portion connected to the first protrusion portion and located in the first hole; and a second embedded portion connected between the first embedded portion and the second protrusion portion, and located in the communication hole.