An endoscope system capable of observing a front view and a side view simultaneously is provided by employing a beam splitter, a first shutter and a second shutter. A servo loop generates a position error signal to control the position of the head. The pin has a flat head at one end and one of the disks comes to rest against the head. By doing so, even if it takes long time to perform a header information print operation, it is possible to prevent time required to perform the substantial receipt issuing operation itself from increasing. The IMD includes a torque sensor configured to generate an output signal that varies as a function of a torque imposed on the torque sensor by an external magnetic field and a control module configured to control operation of the implantable medical device based on the signal output of the torque sensor.