The invention discloses an optical microscopy system for stimulated emission depletion of an object. The apparatus may also include a multiplexer configured to time division multiplex the data streams into a combined data stream and a Generic Framing Procedure-Transparent frame constructor configured to create a GFP-T frame. The monomer or oligomer is chosen from oxetane monomers, oxirane monomers, oxetane oligomers and oxirane oligomers. The transmission device then switches the transmission path of the stand-by system to the active system, and transmits packets through the transmission path that has become the active system as a result of switching. The cooling air drawn in through the inlet by the cooling fan is guided through a gap between the drive unit and an inner surface of the motor housing and is discharged through the outlet. In a given period after transistors are turned on and a motor is rotationally driven, the transistors are turned on, and the other transistors are turned off, and after the given period has elapsed, the onoff operation of the transistor is controlled at a given frequency in a state where the transistors are maintained in an on state, to thereby detect whether or not the motor rotates.