Konica Minolta Business Technologies, Inc.

Michio Yamada

Toshio Naiki

Hiromu Nakamura

Koji Ohashi

Takayoshi Mori

Hisashi Yasumatsu

Koji Ooi

A drawing method for forming a reflective curved surface by pressing a metal plate fitted in a fixed die with a movable die. The fixed die is composed of a lower die and a core, and the movable die is composed of an upper die and a presser. During the drawing, the metal plate is pressed to have a compressed border portion between a non-pressed portion and a curved surface pressed portion. It is the most desirable to compress the border portion to have a thickness which is 70% of the thickness of the metal plate before drawing.

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Shinshiro, Japan

Michio Yamada