Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hiromu Nakamura0
Michio Yamada0
Takayoshi Mori0
Toshio Naiki0
Hisashi Yasumatsu0
Koji Ohashi0
Koji Ooi0
Date of Patent
January 29, 2008
0Patent Application Number
107645360
Date Filed
January 27, 2004
0Patent Primary Examiner
Patent abstract
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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