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|1. (WO2016158089) FLUORESCENT LIGHT SOURCE DEVICE|
|Applicants:||USHIO DENKI KABUSHIKI KAISHA
|Title:||FLUORESCENT LIGHT SOURCE DEVICE|
The present invention addresses the problem of providing a highly reliable fluorescent light source device that does not exhibit reduced reflectance over a long period of time. This fluorescent light source device is provided with: a fluorescent plate that emits fluorescent light due to excitation light, with the surface of said plate serving as an excitation-light incident surface; a reflecting layer disposed on the reverse-surface side of the fluorescent plate; and a heat-radiating substrate. The fluorescent light source device is characterized in that a sealing layer covering the reverse and peripheral side surfaces of the reflecting layer is provided adhered to the peripheral edge of the reverse surface of the fluorescent plate with an adhesive layer interposed therebetween, and an anti-spreading layer formed from nickel plating is provided upon the heat-radiating substrate with a joining material layer interposed therebetween.