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:
Jan. 29, 2002
Filed:
Jun. 21, 2000
Koji Hirata, Yokohama, JP;
Kazunari Nakagawa, Ebina, JP;
Tomoharu Nakiri, Yokohama, JP;
Naoyuki Ogura, Ebina, JP;
Chihiro Egawa, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The projection image display apparatus includes a plurality of image generating sources for generating three primary colors, including red, green, blue image light, respectively, and a projection lens containing a plurality of lens elements provided in correspondence with each of said image generating sources for enlarging/projecting images displayed by the image generating sources onto a screen. The projection lens corresponding to the red image generating source includes a light transmitter that satisfies the condition: TRS<TRL/3, wherein TRS is the transmittance with respect to a wavelength &lgr; RSmax of sub-peak energy of a spurious component existing in a short-wavelength-sided region rather than a peak energy waveform &lgr; Rmax of a spectral distribution of the red image light, and TRL is the transmittance with respect to a wavelength &lgr; RLmax of sub-peak energy of a spurious component existing in a long-wavelength-sided region rather than the peak energy wavelength &lgr; Rmax of the spectral distribution of the red image light.