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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 5257131 B1

PDFFull Text
Date of Patent:
Oct. 26, 1993

Filed:

Jun. 12, 1991

Polarization diffraction element and polarization detector employing the

Applicant:
Inventors:

Yoshio Yoshida, Tenri, JP;

Takahiro Miyake, Tenri, JP;

Yasuo Nakata, Kashihara, JP;

Yukio Kurata, Tenri, JP;

Assignee:

Sharp Kabushiki Kaisha, Osaka, JP;

Attorney:

Birch, Stewart, Kolasch & Birch

Primary Examiner:

Bruce Y Arnold

Assistant Examiner:

David R Parsons

Int. Cl.
CPC ...
G02B / ; G02B / ; G11B / ;
U.S. Cl.
CPC ...
359485 ; 359558 ; 359569 ; 369109 ; 369110 ; 2502 / ;
Abstract

A polarization diffraction element comprising two diffraction gratings formed on both faces of a substrate respectively. Both the diffraction gratings have grating lines which are arranged at the same grating pitch, and whose directions mutually form a predetermined minute angle. The grating lines may also be arranged parallel to each other. In this case, the relationship between grating pitches D.sub.1, D.sub.2 of the respective diffraction gratings and the wavelength .lambda. of an incident light is expressed as:

Find Patent Forward Citations

Yoshida, Yoshio. (1993). Polarization diffraction element and polarization detector employing the (U.S. Patent No. 5257131). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5257131

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