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:
May. 06, 1997
Filed:
Sep. 26, 1995
Applicant:
Inventors:
Assignee:
New Oji Paper Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
356364 ; 356367 ;
Abstract
A compensation polarizing plate which is superior in polarization characteristic to a polarizing filter layer of a composite layer sample is arranged on the polarization filter layer side of the composite layer sample whose polarizing filter layer has an insufficient degree of polarization, and polarization transmission axes of the polarizing filter layer and the compensation polarizing plate are kept in parallel with each other to compensate the polarization characteristics of the polarization filter layer. Measurement for obtaining the retardation value and the optical principal axis direction of the sample is carried out in the state of the compensated sample.