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:
Mar. 04, 1980
Filed:
Nov. 18, 1977
Applicant:
Inventors:
Masahiro Noda, Inazawa, JP;
Kazuo Tokui, Inazawa, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
307116 ; 307130 ; 328-5 ;
Abstract
A proximity detector including a pair of antennae disposed at the front edge of a door with a space; and voltage converters for converting earth electrostatic capacities of the antennae to the corresponding voltages. The proximity detector further includes a first detecting circuit for detecting a differential signal of the outputs of the voltage converters; and a second detecting circuit for detecting a summing signal of the outputs of the voltage converters. The movement of the door is controlled by the output of the first detecting circuit and/or the output of the second detecting circuit.