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:
Dec. 28, 2010
Filed:
Jul. 28, 2004
Aiichirou Sasaki, Tokyo, JP;
Mitsuru Shinagawa, Tokyo, JP;
Nobutarou Shibata, Tokyo, JP;
Tadashi Minotani, Tokyo, JP;
Kazuo Fujiura, Tokyo, JP;
Masahiro Sasaura, Tokyo, JP;
Seiji Toyoda, Tokyo, JP;
Aiichirou Sasaki, Tokyo, JP;
Mitsuru Shinagawa, Tokyo, JP;
Nobutarou Shibata, Tokyo, JP;
Tadashi Minotani, Tokyo, JP;
Kazuo Fujiura, Tokyo, JP;
Masahiro Sasaura, Tokyo, JP;
Seiji Toyoda, Tokyo, JP;
Abstract
The present invention relates to an electric field sensor including: a light source (); an electro optic crystal () which is applied with an electric field based on a signal under test, in which a birefringent index changes according to the electric field, and which changes a polarization state of light incident from the light source according to the birefringent index and emits the light; and a detector () that detects an electric signal according to the change of the polarization state of the light emitted from the electro optic crystal (). Further, the electric field sensor includes: a signal electrode () for applying the electric field based on the signal under test to the electro optic crystal (); a counter electrode () that forms a pair with the signal electrode (); and an auxiliary electrode () that is electrically connected to the counter electrode (), and that forms a capacitance with ground.