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:
Jan. 25, 2005
Filed:
Jul. 31, 2002
Kenjiro Hamanaka, Osaka, JP;
Kenjiro Hamanaka, Osaka, JP;
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Abstract
An object beam divided by a light dividing meansis caused to enter a photo-refractive polymer layerthrough an optical fiber. On the other hand, a reference beam divided by the light dividing meansis irradiated on the photo-refractive polymer layerthrough a lensfrom the opposite side. In this manner, the object beam is superimposed on the reference beam in the photo-refractive polymer layerto provide an interference fringe or pattern. Since a photo-refractive polymer has a specific characteristic whereby the refractive index changes according to the intensity of irradiation light and the change is fixed after the irradiation light is stopped, a diffraction gratingcorresponding to the interference fringe is recorded on the photo-refractive polymer layer. This diffraction gratingexhibits a specific characteristic whereby the object beam emitted from the optical fiberis emitted in the direction of the reference beam.