Light emitting device

Details Light emitting device Light emitting device

2005-12-14

2008-10-07

Sanghavi, Hemang (Department: 2874)

Optical: systems and elements

Optical frequency converter

C372S021000, C385S028000

Reexamination Certificate

active

07433115

ABSTRACT:
A light emitting device comprises a first unit and a second unit, the first unit comprising: a first excitation light source comprising a laser element emitting blue wavelength band excitation light; a first wavelength converting member comprising at least one type of fluorescent material and which absorbs at least a portion of a first excitation light emitted from the first excitation light source, converts the wavelength, and releases light with a wavelength longer than the first excitation light; and a first light guide which has a refractive index in the center region of the cross-section which is higher than the refractive index of the surrounding region and which transmits the first excitation light emitted from the first excitation light source; and the second unit comprising: a second excitation light source comprising a laser element which emits excitation light with a wavelength band shorter than the blue wavelength band excitation light emitted by the laser element; a second wavelength converting member which is similar of the above; and a second light guide which is similar of the above.

REFERENCES:
patent: 5054878 (1991-10-01), Gergely et al.
patent: 6717355 (2004-04-01), Takahashi et al.
patent: 6724522 (2004-04-01), Hartung
patent: 7277618 (2007-10-01), Yamazaki et al.
patent: 2005/0215861 (2005-09-01), Hakamata
patent: WO01/40702 (2001-06-01), None

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