A patch antenna for a first frequency is disposed on a first face of a dielectric substrate, and has a first size. in at least one reactor, which constitutes a cooling-tube reactor and contains a catalyst. The tentative optimum drive current is supplied to the light source part; the tentative optimum heater power is supplied to the heater part; a reference signal is recorded in a magnetic recording medium; and flying height of the thermally-assisted magnetic recording head is set by determining whether or not the reference signal is recorded with the desired signal intensity. It is thus possible to easily and correctly determine the physical characteristics of the disc while maintaining the compatibility with known recording media. Thus, as a cable of the lock is looped around a post, the tablet device is secured at a specific position and is not stolen easily. Thus, the contact shape is longitudinal in a transistor width direction, which makes it possible that a large current is caused to flow with a small interval of gates thereof.