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:
Aug. 22, 1989
Filed:
Dec. 09, 1987
Mikihiro Yamashita, Hikone, JP;
Kaoru Furukawa, Hikone, JP;
Abstract
An electronic detector for locating an object behind a wall surface has a metallic object detecting section and a general object detecting section which are energized by a common battery to be operative simultaneously. The metallic object detecting section includes a magnetic field sensor for detecting any change in a magnetic field developed therearound and providing a second electric signal indicative of that change. The general object detecting section includes a capacitor sensor for sensing any change in the capacitance of the wall and providing a first electric signal indicative of that change. The first and second electric signals are applied respectively to first and second control circuits where they are analyzed to provide first and second control outputs when their levels reach first and second reference levels, respectively. Upon receiving the first and second control output, first and second indicators turn on for indicating the detection results. Thus, both of the first and second indicators will turn on when there is detected a metallic object behind the wall surface and only the first indicator will turn on when there is deteced a non-metallic object behind the wall surface, whereby the user can easily distinguish the metallic object and the non-metallic object detected.