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:
Jan. 29, 2010
Hiroyuki Saitou, Tokyo, JP;
Atsushi Katou, Tokyo, JP;
Motoyasu Utsunomiya, Tokyo, JP;
Akihiro Osaka, Tokyo, JP;
Masateru Matsubara, Tokyo, JP;
Hiroyuki Saitou, Tokyo, JP;
Atsushi Katou, Tokyo, JP;
Motoyasu Utsunomiya, Tokyo, JP;
Akihiro Osaka, Tokyo, JP;
Masateru Matsubara, Tokyo, JP;
NEC Display Solutions, Ltd., Tokyo, JP;
Abstract
This invention realizes an illumination optical system with a small etendue that has a longer lifetime and a high degree of brightness. The invention includes: a laser light source that generates excitation light; a phosphor that generates a fluorescent light by means of the excitation light; a light tunnel that projects the excitation light that is incident at one end towards the phosphor from another end, and projects a fluorescent light generated with the phosphor from the one end; and a dichroic mirror that is provided between the laser light source and the light tunnel, and that allows the fluorescent light or the excitation light to pass through, and reflects the remaining excitation or fluorescent light.