发明名称 |
Coordinate detecting apparatus |
摘要 |
A coordinate detecting apparatus for determining the coordinate data of a point on a plane by indicating the point with a touch of a fingertip or other load to the point. The apparatus comprises a transparent resistive film forming the plane (touch panel) and a buffer circuit operating as a voltage follower circuit having substantially infinate input impedance. The buffer amplifier is operatively connected between each selected pair of facing ends of a substantially rectangular region of the resistive film, and equalizes the potentials at the ends. The change of the impedance between one of the ends and the ground is detected in accordance with the touch of the fingertip to the touch panel and is used as an original coordinate data. Further modifications concerning the avoidance of degradation in the detection quality due to fluctuations of the impedance provided by the touch of a fingertip, for example, and the methods to perform 2-dimensional coordinate detection are described.
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申请公布号 |
US4680430(A) |
申请公布日期 |
1987.07.14 |
申请号 |
US19850706224 |
申请日期 |
1985.02.27 |
申请人 |
FUJITSU LIMITED |
发明人 |
YOSHIKAWA, KAZUO;ASANO, TORU;YAMAGUCHI, HISASHI;TAKIZAWA, HIDEAKI;ANDOH, SHIZUO |
分类号 |
G06F3/033;G06F3/045;(IPC1-7):G08C21/00 |
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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