Abstract: A light source device includes a case defining an accommodation space. The case includes a light transmissible surface and a locating-mounting hole. The locating-mounting hole defines a projection through space within the accommodation space in an axial direction of the locating-mounting hole. The light source device further includes a plurality of light emitting sources arranged within the accommodation space and surrounding the projection through space. The light emitting sources are configured for emitting light towards the light transmissible surface.