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:
Oct. 13, 1987
Filed:
Dec. 05, 1984
Nippondenso Co., Ltd., Kariya, JP;
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.