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. 05, 2015
Filed:
Nov. 14, 2012
Koji Hirata, Yokohama, JP;
Masahiko Yatsu, Fujisawa, JP;
Takanori Hisada, Yokohama, JP;
Masayuki Ohki, Kokubunji, JP;
Koji Hirata, Yokohama, JP;
Masahiko Yatsu, Fujisawa, JP;
Takanori Hisada, Yokohama, JP;
Masayuki Ohki, Kokubunji, JP;
Hitachi Maxell, Ltd., , JP;
Abstract
A projection display system includes a projection display unit and a member in a form of one of a windable screen, a white board and a notice board. The projection display unit projects an image light onto a projection plane of the member to display an image thereon. The projection display unit includes a light source, an image display element, a lighting optical system irradiating a beam of light from the light source on the image display element, and a projection optical system projecting the image light from the image display element toward the member. The projection optical system includes, in order toward the member from the image display element, a front lens group, and a reflecting mirror shaped to be axial-asymmetrical with respect to the optical axis.