Abstract: A wafer including a substrate, a dielectric layer over the substrate, and a conductive layer over the dielectric layer is disclosed. The substrate has a main portion. A periphery of the dielectric layer and the periphery of the main portion of the substrate are separated by a first distance. A periphery of the conductive layer and the periphery of the main portion of the substrate are separated by a second distance. The second distance ranges from about a value that is 0.5% of a diameter of the substrate less than the first distance to about a value that is 0.5% of the diameter greater than the first distance.

Abstract: A wafer including a substrate, a dielectric layer over the substrate, and a conductive layer over the dielectric layer is disclosed. The substrate has a main portion. A periphery of the dielectric layer and the periphery of the main portion of the substrate are separated by a first distance. A periphery of the conductive layer and the periphery of the main portion of the substrate are separated by a second distance. The second distance ranges from about a value that is 0.5% of a diameter of the substrate less than the first distance to about a value that is 0.5% of the diameter greater than the first distance.

Abstract: An improved structure of hand tool comprising a first pipe, a second pipe, a rotating sleeve, a pushing member, a pushing axle-rod and a chuck, wherein: the first pipe has thereon a position-limiting slot and two positioning holes provided for extending therethrough of two position-limiting elements; the first pipe has thereon an elastic piece to abut against the position-limiting elements; the rotating sleeve is slipped over the first pipe and has thereon in opposition to the position-limiting slot a hole for extending of a pivotally-connecting element therein to connect and lock the pushing member, the hole has on the inner wall thereof a positioning groove to engage the position-limiting elements and to make positioning with the elastic piece; the pushing member is slipped over the pushing axle-rod which has a bearing thereon; and one end of the pushing axle-rod is brought to rotate by a driving element, the other end is pivotally connected with the chuck, and the hand tool is completed to be able of fast

Abstract: An improved structure of multi-functional hand tool, wherein, a pushing axle rod is screw connected with a chuck, a pushing axle rod is screw connected with a driving rod; bearings are slipped over a positioning sleeve, then the positioning sleeve, the pushing axle rod and the chuck are together placed in a pipe body with the bearings. The positioning sleeve can be rotated in the bearings. A front cover is locked in the front end of the pipe body; the chuck is extended out of the front cover. The pushing member is screwed in the pipe body to render a hole on a rear enlarged threaded portion of the pushing member to be exactly located at a position limiting slot of the pipe body. The external sleeve then is slipped over the pipe body, and an inner screw hole of the external sleeve is aligned with the position limiting slot of the pipe body. Then the positioning screw rod is screwed in the inner screw hole to extend through the position limiting slot and the hole of the pushing member.