发明名称 |
Electrostatic tablet writing stylus |
摘要 |
An improved device for capacitively detecting signals generated in a writing table by a grid of conductive wires that produce a varying electrostatic field near its surface to be picked up through a stack of paper with the table functioning as one plate of a capacitor, and a conductive stylus as the other plate. The improvement consists of grounding the stylus, which has an extended body portion surrounded by a tubular member, extending the tubular member to a point very near the stylus tip where it functions as the second plate of a capacitor, and connecting the tubular member to a preamplifier mounted in the device.
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申请公布号 |
US4158747(A) |
申请公布日期 |
1979.06.19 |
申请号 |
US19780919264 |
申请日期 |
1978.06.26 |
申请人 |
TELAUTOGRAPH CORPORATION |
发明人 |
MULLER, ALEX M.;TYRRELL, JOSEPH L. |
分类号 |
G06F3/033;(IPC1-7):G08C21/00;H04N1/00 |
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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