The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 1988
Filed:
Apr. 02, 1986
Kouichi Yamanoue, Nishio, JP;
Junji Kitagawa, Okazaki, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
A signal transmission system has a plurality of sensors, a plurality of modulation circuits connected to the sensors, a single demodulation circuit and a single power supply line for connecting the modulation circuits to the demodulation circuit. Each of the sensors has a resistor-capacitor type oscillation circuit of which the capacity varies with the variation of a physical quantity to be measured and outputs an oscillation output of the oscillation circuit as a sensor signal. Each of the modulation circuit has a one-shot circuit having a predetermined set time different from another one-shot circuit of another modulation circuit for sustaining the sensor signal for the predetermined set time. Each of the modulation circuits further has a transistor for switching and a zener diode of a zener voltage different from that of another zener diode of another modulation circuit. The transistor connects the zener diode to the electric power line to lower the voltage of the electric power line to the zener voltage when the sensor signal is inputted. The demodulation circuit has a plurality of comparators and a logic circuit. Each of the comparators compares the voltage of the power supply line with a reference voltage to generate a comparison signal. The logic circuit performs a logical operation of the comparison signals from the comparators to obtain the sensor signals at different output terminals.