DIE UNIT FOR MOLDING POLYGON MIRROR AND PRODUCTION OF POLYGON MIRROR

摘要

PROBLEM TO BE SOLVED: To enable a die unit to highly accurately form the division angle of a mirror surface (a surface forming the mirror surface of a polygon mirror) in a polygon mirror molding die for molding a polygon mirror. ;SOLUTION: A die unit is provided with plural mirror surface tops 9 forming vertical pins 8 arranged along the circumference on the bottom of a mirror surface top storing recessed part 7a of a mirror surface top storing die 6 and mirror surfaces 9a rotation-controllably supported around the respective vertical pins 8 and arranged radially on the center side of the radial direction and arranged so as to form a cavity V of which the side face is a positive polygon, a mirror surface top position adjusting device C abutting on the outside face of the tops 9 and for adjusting the rotary positions of the tops 9 around the pins 8 and a mirror surface top fixing member 11 for fixing the tops 9 on a mirror surface top storing die 6.;COPYRIGHT: (C)1999,JPO