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. 16, 2011
Filed:
Jun. 04, 2007
Makiko Saito, Mitaka, JP;
Osamu Masuda, Machida, JP;
Makiko Saito, Mitaka, JP;
Osamu Masuda, Machida, JP;
Konica Minolta Holdings, Inc., Tokyo, JP;
Abstract
A quarter-wave plate includes a base member including a ridge and trough periodic structure with a structural period of λ/2<P<λarranged on one side of the base member, where λis the minimum wavelength among the wavelengths of a plurality of light fluxes which pass the quarter-wave plate. In the quarter-wave plate, refractive index of a ridge portion of the ridge and trough periodic structure for the wavelength λand a light transmittance have predetermined values. The ridge and trough periodic structure satisfies the predetermined condition relating to the structural height and the structural width of the ridge portion.