Pedal device 10 has a pedal member 11 depressed by the driver, and arm member 12 engaged with the pedal member, for turning when the pedal member is depressed, and transmitting driver’s force-on-pedal to the brake master cylinder. The method involves coating at least part of an area of a surface of a metal sheet article with a substantially solvent-free silicone oil at an average coating application rate in a range of 1. The second sensing circuit charges and discharged the cathode capacitance by the photocurrent flowing through the photodiode, and outputs electric charge stored in the cathode capacitance via the data line. The overall system design can be relatively simple, and the operation of such a system can allow for operation by relatively inexperienced users. A pin is movable to bridge across the jaw to capture the eye between extended and retracted positions. The said predetermined frequency is 180 Hz or more.