发明名称 |
Force sensing semiconductive touchpad |
摘要 |
A touchpad assembly and method for providing a signal to a computer indicative of the location and applied pressure of an object touching the touchpad assembly is provided. The touchpad assembly includes X and Y position and pressure sensitive semiconductor resistance sensor layers. The X and Y sensors have a pair of spaced apart X and Y conductive traces running across opposite ends such that a resistance RX connects the pair of X traces and a resistance RY connects the pair of Y traces. The X and Y sensors come into contact at a contact point when an object asserts a pressure on the touchpad. The contact point is connected to each trace by a variable pressure resistance RZ associated with the X and Y sensors and variable position resistances of the X and Y resistances. First and second pair of timing capacitors are connected to respective ones of the pairs of X and Y traces. A microprocessor controls and monitors charging time of the capacitors to determine the position and asserted pressure of the object touching the touchpad. |
申请公布号 |
US5943044(A) |
申请公布日期 |
1999.08.24 |
申请号 |
US19970857134 |
申请日期 |
1997.05.15 |
申请人 |
INTERLINK ELECTRONICS |
发明人 |
MARTINELLI, JOHN K.;MARTINELLI, ROBERT M.;PICKETT, MARK C.;RITCHEY, WENDELL W.;YANIGER, STUART J. |
分类号 |
G06F3/033;G06F3/038;G06F3/041;G06F3/048;(IPC1-7):G08C21/00;G09G5/00 |
主分类号 |
G06F3/033 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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