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:
Aug. 14, 2007
Filed:
Nov. 18, 2005
Hisao Osawa, Kashiwa, JP;
Naoshi Aikawa, Fujisawa, JP;
Akira Adachi, Sagamihara, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A spectroscope capable of suppressing the dimension and the cost with avoiding a problem caused by polarization dependency of the diffraction grating. The spectroscope includes a polarizing beam splitter platethat divides the light from an input fiberinto a first and a second optical paths and polarizes each light of each optical path having different direction of polarization with each other, a Fresnel rhomb half wave platethat arranges the direction of polarization of the light in the first optical path into that in the second optical path and a plane mirrorthat deflects the second optical path such that at least a portion of an area where the light through the first optical path is incident on the diffraction gratingand an area where the light through the second optical path is incident on the diffraction grating overlap each other.