Patent ID: 6118568
Filing Date: 2000-09-12
Classification: H02K

Abstract:
A polygon mirror assembly comprising:a polygon mirror having a setting hole at a center portion thereof and regular polygon shape plural corner portions; anda supporting stand for supporting said polygon mirror; wherein said polygon mirror and said supporting stand are secured to each other by at least one pressure joint, each pressure joint being at a position which is substantially aligned in a radial direction with a corner portion of said regular polygon shape plural corner portions of said polygon mirror;said pressure joint formed by applying a pressure force with a supersonic high frequency to said positions to be subjected to said pressure joint of said supporting stand;wherein said pressure joint is produced by radially and symmetrically arranged plural grooves at said positions to be subjected to said pressure joint of an upper side outer periphery of said supporting stand;radially and symmetrically arranged plural pressing projection portions are overlaid and pressed down at said positions to be subjected to said pressure joint against an upper side portion of said setting hole of said polygon mirror;said plural pressing projection portions are formed according to a formation of said plural grooves; andmaterial of said supporting stand is deformed outward from an outer peripheral portion to form said plural pressing projection portions.