PROBLEM TO BE SOLVED: To provide an optical device which enables the improvement in the heat dissipation property of a fluorescent part and the condensibility to a light-guide part.SOLUTION: An optical device 1 comprises: an excitation light source 2； a first translucent part 3 which allows excitation light emitted by the excitation light source 2 to pass therethrough； a fluorescent part 4 provided on a face of the first translucent part 3 opposite to a side on which the excitation light is incident, which emits fluorescence in response to the excitation light； a second translucent part 5 disposed so that the fluorescent part 4 is located between the first translucent part 3 and the second translucent part, through which light from the fluorescent part 4 goes； a lighting transmission fiber 13 for guiding light from the second translucent part 5； and a micromachined film 52 provided on a side of the lighting transmission fiber 13 of the second translucent part 5, and serving to condense light from the fluorescent part 4 toward the lighting transmission fiber 13.SELECTED DRAWING: Figure 3【課題】蛍光部の放熱性と、導光部への集光性とを向上することができる光学機器を提供する。【解決手段】光学機器１は、励起光源２と、励起光源２から照射された励起光が透過する第１透光部３と、第１透光部３において、励起光が入射する側とは反対側の面に設けられ、励起光によって蛍光を発する蛍光部４と、蛍光部４を第１透光部３とで挟むように配置され、蛍光部４から出射した光が透過する第２透光部５と、第２透光部５から出射した光が導光する照明伝送用ファイバー１３とを備える。そして、第２透光部５の照明伝送用ファイバー１３側には、蛍光部４から出射した光を照明伝送用ファイバー１３へ集光する微細加工フィルム５２が設けられる。【選択図】図３
