Key board of mobile phone
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United States of America Patent
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Dec 27, 2016
Grant Date -
Jun 28, 2012
app pub date -
Jun 25, 2010
filing date -
Sep 29, 2009
priority date (Note) -
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Abstract
A key board of mobile phone applied in key circuit of mobile phone is provided. A first electrode, a second electrode and a third electrode are disposed on a printed circuit board (PCB), the second electrode is disposed around the first electrode in circular form, tooth profile structures disposed matched with the third electrode are extended from an outer side of the second electrode, the third electrode is connected with the first electrode, the setting can be applied to various types of keys. The key board of the mobile phone can not only be applied to the dome keys, but also the carbon granule keys. If customers need different designs of keys, the new keys are needed to be redesign, and a new main board is not necessary to design, which greatly saves development time and lowers the cost.
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