An information processing unit is configured so that in a case where a display-rotating button 4 or 11b is operated by a user so as to select a second display mode, and where either a communication unit 5 or 13 is in an activated state and the user does not halt the action of the communication unit 5 or 13, the display mode is shifted to a mode other than the second display mode. A layer to be etched is provided, then an initial sacrificial patterning layer, for example formed using optical lithography, is formed over the layer to be etched. The output delay of the on-chip latch is measured by making the latch delay part of a ring oscillator and measuring its frequency of oscillation. The mandrel assembly further includes a bit coupler secured to the body. The object is detected within a second operational range of a collision detector. Each first powder particle is a wavelength conversion material.