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:
Jan. 20, 1987
Filed:
Jul. 23, 1984
Takashi Sakurai, Nagoya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
In an unauthorized entry detection system for automotive vehicles, an oscillator is installed within the passenger compartment of the vehicle to generate an electromagnetic wave with a predetermined frequency defined by the interior size of the compartment, a first antenna connected to the oscillator to propagate the electromagnetic wave in the whole interior of the compartment in such a manner that the compartment resonates as a cavity resonator when all the doors and windows are closed, a second antenna arranged within the compartment to generate an induced voltage in response to the magnetic field component of the propagated electromagnetic wave, and a detecting circuit connected to the second antenna to detect a change of the induced voltage level caused by entry of a human body into the compartment and/or opening of the doors or windows, thereby to generate a detection signal therefrom.