Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1997-06-05
1999-08-10
Callahan, Timothy P.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
377 12, G01D 300
Patent
active
059370238
ABSTRACT:
The present invention relates to a method for detecting a minor variation of capacity via accumulation and a circuit for detecting the same. An oscillated pulse signal is generated by a delay accumulating circuit which includes a logic device having an open drain and a pull up resistance. The generated pulse signal is then sent to a microprocessor via a counter. The microprocessor will determine whether there is a variation of the frequency of the pulse signal. When a variation of capacity is detected at the detecting polar plate connected to the testing terminal of the delay accumulating circuit, the microprocessor picks up and determines this variation. The present invention can be applied to a plurality longitudinal and transverse polar plates. When a conductor is moved along the polar plates, the variation of the capacity resulting from the movement of the conductor above the static capacity detecting plate can be readily detected. The static capacity detecting plate can be used as an input device for computer.
REFERENCES:
patent: 4872124 (1989-10-01), Shimizu et al.
patent: 5089770 (1992-02-01), Lee et al.
Callahan Timothy P.
Shin Eunja
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