transparent disk with the fan shaped reflection region 2 p that is to say the rest of the reflection region 2 p is the transmission region 2 q but if the reflection transmission wheel 2 b is formed by the fan shaped reflection region 2 p itself a material can be saved and the production cost for a device can be reduced note that in the first embodiment an angular range of the fan shaped reflection region 2 p a pivot point thereof is the rotating shaft 2 m is 90 degrees but a dimension of the reflection region 2 p is not limited to this moreover in the first embodiment the reflection region 2 p and the transmission region 2 q are switched by rotating the reflection transmission wheel 2 b but the reflection region 2 p and the transmission region 2 q can be switched by reciprocating the rectangle shaped substrate the reflection transmission wheel 2 b is arranged obliquely relative to an optical axis o 1 of the light path of the first illumination optical system 1 a in the first embodiment the reflection transmission wheel 2 b is arranged at 45 degrees relative to the optical axis o 1 but it is not limited to this angle if the light path of the excitation light in the wavelength u03bba can be switched furthermore the incidence of speckle pattern can be decreased by using the diffuser panel in place of the transmission region 2 q of the reflection transmission wheel 2 b the reflection transmission wheel 2 b is appropriately rotated in synchronization with the image data and the transmission light path and the.