Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1992-06-19
1994-03-01
Sikes, William L.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
3612834, 331 65, 307308, 73724, G01L 1904
Patent
active
052915344
ABSTRACT:
A digital capacitive sensing device comprises: a reference capacitor having a reference capacitance unaffected by a force to be measured; a reference pulse signal generating circuit which generates a reference pulse signal of a frequency corresponding to the reference capacitance; a sensing capacitor having capacitance variable according to the magnitude of the force; a measuring pulse signal generating circuit having a construction similar to that of the reference pulse signal generating circuit and capable of generating a measuring pulse signal of a frequency corresponding to the capacitance of the sensing capacitor; and a differential arithmetic circuit which adds the number of pulses of the reference pulse signal in a predetermined time interval to a set value and subtracts the number of pulses of the measuring pulse signal in a predetermined time interval from the set value. The reference pulse signal generating circuit is capable of compensating a zero point temperature characteristic of a detection value, and the measuring pulse signal generating circuit is capable of compensating a detection sensitivity temperature characteristic.
REFERENCES:
patent: 3838684 (1974-10-01), Manuel et al.
patent: 4227419 (1980-10-01), Park
patent: 4392382 (1983-07-01), Myers
patent: 4398426 (1983-08-01), Park et al.
patent: 4517622 (1985-05-01), Male
patent: 4550611 (1985-11-01), Czarnocki
patent: 4633491 (1986-12-01), Kuhnel
patent: 4793187 (1988-12-01), Kordts
patent: 4864463 (1989-09-01), Shkedi et al.
Kuwahara Shiro
Nagata Tomio
Sakurai Shizuki
Sugiyama Susumu
Tabata Osamu
Kabushiki Kaisha Toyota Chuo Kenkyusho
Ouellette Scott A.
Sikes William L.
Toyoda Koki Kabushiki Kaisha
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