DIE UNIT FOR MOLDING POLYGON MIRROR AND PRODUCTION OF POLYGON MIRROR

• Main Author: TERAI YUJI
• Format: Patent
• Language: English
• Published: 30.04.1999
• Edition: 6
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

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.