WAVELENGTH CONVERSION ELEMENT, METHOD FOR MANUFACTURING WAVELENGTH CONVERSION ELEMENT, LIGHT SOURCE DEVICE AND PROJECTOR

• Main Authors: SHIMIZU TETSUO, YANO KUNIHIKO, YOKOO TOMOHIRO, YASUMATSU KO, YOTSUYA SHINICHI, TAKAGI KUNIHIKO, SHIRATORI YUKIYA
• Format: Patent
• Language: English; Japanese
• Published: 21.02.2019
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; BLASTING; CINEMATOGRAPHY; ELECTROGRAPHY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; HOLOGRAPHY; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To provide a wavelength conversion element suppressing reduction in extraction efficiency of fluorescent light, to provide a light source device including the wavelength conversion element, and to provide a projector including the light source device.SOLUTION: The wavelength conversion element of the present invention includes: a wavelength conversion layer having a first surface where excitation light enters and a second surface opposing to the first surface; a first layer disposed opposing to the second surface and containing a first inorganic oxide; a second layer disposed opposing to the first surface and containing a first metal or a second inorganic oxide different from the first inorganic oxide; and a third layer disposed opposing to the second layer, containing either silver or aluminum, and reflecting the excitation light or light resulting from the wavelength conversion of the excitation light by the wavelength conversion layer.SELECTED DRAWING: Figure 3 【課題】蛍光の取り出し効率の低下を抑制した、波長変換素子を提供する。また、当該波長変換素子を備えた光源装置を提供する。また、当該光源装置を備えたプロジェクターを提供する。【解決手段】本発明の波長変換素子は、励起光が入射する第１面と、第１面に対向する第２面を有する波長変換層と、第２面に対向して設けられ、第１の無機酸化物を含有する第１層と、第１層に対向して設けられ、第１の金属または前記第１の無機酸化物とは異なる第２の無機酸化物を含有する第２層と、第２層に対向して設けられ、銀またはアルミニウムのいずれか一方を含有し、励起光が波長変換層により波長変換された光または励起光を反射する第３層と、を備える。【選択図】図３