Title:
DOMED METAL SPRING AND SWITCH SHEET
Document Type and Number:
Japanese Patent JP2009259665
Kind Code:
A
Abstract:
To avoid a contact failure between a domed portion and a fixed contact on a wiring board due to dust even when the domed portion of a domed metal spring is repetitively clicked.
The outer periphery end of the domed portion of the domed metal spring and bridge portions thereof are formed with punching work. Inside the domed portion, a plurality of protrusions are formed in a range of at least 3/4 or shorter of a distance from the bridge portions on both sides to a domed peak point.
Inventors:
YAMAMOTO KAZUHIRO
MIMURA SHOJI
NAOE KUNIHIRO
MIMURA SHOJI
NAOE KUNIHIRO
Application Number:
JP2008108524A
Publication Date:
November 05, 2009
Filing Date:
April 18, 2008
Export Citation:
Assignee:
FUJIKURA LTD
International Classes:
H01H1/06; H01H5/30; H01H13/48
Attorney, Agent or Firm:
Takeo Masuda
Daisuke Takahashi
Daisuke Takahashi