Communications: electrical – Selective – Having indication or alarm
Patent
1984-12-05
1987-10-13
Rowland, James L.
Communications: electrical
Selective
Having indication or alarm
340642, 338114, B60Q 146
Patent
active
047001720
ABSTRACT:
An apparatus for detecting, for example, the disconnection of signal lights such as flashers for vehicles and for warning of this disconnection has a detecting resistor element for converting an ON current of the signal lights into a voltage signal. The voltage signal detected by this resistor element is compared with a reference voltage which is set at a discrimination/oscillation control circuit so as to detect if the detecting voltage signal is lower than the reference voltage. When such a state is detected, the oscillation frequency of an oscillator for changing the flashing frequency of the signal light is doubled. The disconnection of the lights can be detected by observing the frequency of the flashing signal. The detecting resistor element consists of a resistive wiring formed of a resistive material which is processed so as to have a smaller resistance than desired. After the resistive wiring is connected to the discrimination/oscillation control circuit by welding or the like, the resistive wiring is depressed at least once, thereby decreasing the cross-sectional area thereof and allowing the resistance of the resistive wiring to match the reference voltage of the control circuit. The resistance of the resistive wiring is thus increased.
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Microelectronics, by Jacob Millman, .COPYRGT.1979, p. 8, published by McGraw-Hill Book Co.
Atsumi Katsuhito
Ishida Hideo
Tanaka Ryoichi
Hofsass Jeffery A.
Nippondenso Co. Ltd.
Rowland James L.
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