A load detecting device includes a plurality of load sensors which are disposed in a matrix shape and correcting means for setting at least one of the plural load sensors as a standard load sensor and for correcting level of output values of each load sensors to level of output value of the standard load sensor on the basis of the output values of each load sensors. The ultrasound beacons are configured to emit ultrasound pulses that can be received by client devices in ultrasound communication range of the beacons. The light introduced into the core layer travels substantially parallel to the axis of the parabola, and is reflected by the side surface so as to be converged at the focal point of the parabola and is then emitted from the apex portion. Depositing or modifying a layer on the substrate may be carried out.