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:
Jun. 25, 2002
Filed:
Mar. 06, 2000
Isamu Sone, Hitachi, JP;
Masaru Higaki, Kitakyushu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical-voltage sensor having a simple structure and being capable of being formed by directly laminating highly sensitive electro-optical elements is disclosed. The optical-voltage sensor includes a light source , a polarizer , a ¼ wavelength plate , an analyzer , and an O/E converting portion. Two electro-optical elements are arranged adjacent to each other along a light transmitting direction between the ¼ wavelength plate and analyzer . Transparent electrodes are attached to front and back surfaces of each of the electro-optical elements , and voltages having a magnitude equal to one another and a polarity opposite to one another are applied to the electro-optical elements from a power supply and a power supply , respectively.