Patent ID: 6804851
Filing Date: 2004-10-19
Classification: B08B,H01L,Y10S

Abstract:
A holder for a wafer, comprising:a carrier part; a plurality of carrying arms extending in a spider-shaped manner from said carrier part and each having a bore formed therein; a plurality of bolts; and a plurality of guide rollers for positioning the wafer vertically and each mounted rotatably on one of said carrying arms, each of said guide rollers having an annular collar for positioning the wafer horizontally, each of said guide rollers with said annular collar functioning as a rotationally symmetrical sleeve having a through-bore formed therein and secured in a rotatable manner on one of said carrying arms by way of one of said bolts disposed in said through-bore, each of said guide rollers having an underside with an extension resting on one of said carrying arms, said extension having an abutment surface with a diameter being smaller than a diameter of said rotationally symmetrical sleeve to achieve a reduced surface friction; each of said bolts having a bottom bolt section with a self-securing thread for fastening in said bore on one of said carrying arms, a central bolt section for bearing said rotationally symmetrical sleeve with a sliding action, and a top bolt section with a hat-shape for positioning said rotationally symmetrical sleeve vertically.