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. 16, 2003
Filed:
Jul. 02, 2002
Olympus Optical Co. Ltd., Tokyo, JP;
Abstract
The invention relates to a viewing and an image pickup optical system for display devices, which can be used with high efficiency at a plurality of wavelengths and enables bright images to be viewed with satisfactory color reproducibility. The optical system comprises a first prism , a second prism and a volume hologram element disposed between them and cemented to them. The hologram element comprises a first grating vector corresponding to at least a first wavelength and a second grating vector corresponding to a second wavelength shorter than the first wavelength. As the light beam comprising the first and second wavelengths passes through the hologram element , the component of the first wavelength transmits at a given angle of incidence in a region between a first &lgr;&thgr; continuous curved region in which the diffraction efficiency is 10% or greater as determined form the first grating vector and a second &lgr;&thgr; continuous curved region in which the diffraction efficiency is 10% or greater as determined from the second grating vector, and the component of the second wavelength transmits at a given angle of incidence in a region on a shorter wavelength side with respect to the &lgr;&thgr; continuous curved region.