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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.:

US 8779778 B1

PDFFull Text
Date of Patent:
Jul. 15, 2014

Filed:

Apr. 27, 2010

Proximity switch

Applicants:

Toshiyuki Higuchi, Kusatsu, JP;

Teruyuki Nakayama, Kusatsu, JP;

Daichi Kamisono, Ritto, JP;

Satoshi Nishiuchi, Hirakata, JP;

Kazunori Okamoto, Kusatsu, JP;

Inventors:

Toshiyuki Higuchi, Kusatsu, JP;

Teruyuki Nakayama, Kusatsu, JP;

Daichi Kamisono, Ritto, JP;

Satoshi Nishiuchi, Hirakata, JP;

Kazunori Okamoto, Kusatsu, JP;

Assignee:

OMRON Corporation, Kyoto-shi, JP;

Attorneys:

Marvin A. Motsenbocker

Mots Law, PLLC

Primary Examiner:

Huy Q Phan

Assistant Examiner:

Raul Rios Russo

Int. Cl.
CPC ...
G01R 27/28 (2006.01); G01R 27/32 (2006.01); H03K 17/94 (2006.01); H03K 17/95 (2006.01); H03K 17/945 (2006.01); H03K 17/97 (2006.01); G01B 7/14 (2006.01); G01B 7/30 (2006.01); G01N 27/72 (2006.01); G01R 33/00 (2006.01); G01B 7/04 (2006.01);
U.S. Cl.
CPC ...
H03K 17/94 (2013.01); H03K 17/9502 (2013.01); H03K 17/945 (2013.01); H03K 17/97 (2013.01); H03K 17/95 (2013.01); H03K 2017/9706 (2013.01); H03K 2217/960755 (2013.01); G01B 7/046 (2013.01);
Abstract

Disclosed is a proximity switch provided with an actuator unit and a sensor unit. The sensor unit is provided with an antenna coil, a transmitting circuit which transmits electromagnetic waves at a constant frequency to the antenna coil, a receiving circuit which detects external signals received by means of the antenna coil, and control circuits. The actuator unit is provided with an antenna coil, a power supply circuit which rectifies an electromotive force generated in the antenna coil, and a signal processing circuit which receives power supply from the power supply circuit, performs frequency-dividing to the signals received by means of the antenna coil, and transmits the signals from the antenna coil after the frequency-dividing. The control circuit of the sensor unit has memory for registering the frequency of the signals transmitted from the actuator unit. The control circuit determines whether the actuator unit is in proximity to the sensor unit or not by checking the received signals detected by means of the receiving circuit with the operations of the transmitting circuit and the frequency registered in the memory.

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