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:
Sep. 14, 2004
Filed:
Nov. 26, 2002
Tomokazu Masubuchi, Osaka, JP;
Kohtaro Hayashi, Toyonaka, JP;
Minolta Co., Ltd., Osaka, JP;
Abstract
In a polarization beam splitter that allows effective polarization separation in a wide wavelength range with low dependency on angle of incidence, between two prisms is sandwiched a dielectric multilayer film composed of a first and a second multilayer portion that are designed with respect to a first and a second wavelength &lgr; , and &lgr; , respectively. Moreover, the formula &lgr; is fulfilled, and which is greater of the difference between the refractive indices of the high-refractive-index and low-refractive-index layers in the first multilayer portion and the same difference in the second multilayer portion coincides with which is greater differences of the angles &thgr; and &thgr; from the prism vertex angle &thgr;.