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. 21, 2003
Filed:
Dec. 04, 2000
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A light source ( ) is composed of a single element having a light emitting point ( S) emitting a light ( S) and a light emitting point ( L) emitting a light ( L) at a longer wavelength than the light ( S), the light emitting point ( S) and the light emitting point ( L) being formed monolithically. In the direction parallel to the optical axis of a collimator lens ( ), the light emitting point ( S) is placed closer, than the light emitting point ( L), to the collimator lens ( ) and is placed on the side of the inclined plane ( ) of the beam shaping prism ( ). The incidence angles of the light ( S) and the light ( L) to the inclined plane ( ) are set so that the incidence angle of the light ( S) is larger than that of the light ( L) and so that the lights ( S) and ( L) exit from the inclined plane ( ) at equal exit angles. The collimator lens ( ), the beam shaping prism ( ), etc. have refractive indexes which become larger as the wavelength of incident light becomes shorter. It is then possible to simplify the structure and reduce the unstableness of operation caused by a difference in light wavelength.