| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress electric power consumption of portable instruments to a minimum by providing with a first switch that can be transmitted a wireless signal of single shot to the portable instrument, and a second switch that can be transmitted the wireless signal for predetermined time. SOLUTION: In portable instruments 1, 1A, when a first unlock switch 11 is pressed, a first unlock signal of single shot is transmitted only once by electric field strength of transmission. When a lock switch 12 is pressed, a lock signal of single shot is transmitted only once by the electric field strength of transmission. When a second unlock switch 13 is pressed, a second unlock signal is transmitted so as to intermit only the predetermined number of times by the electric field strength of transmission. Thus, only when three kinds of operating switches are pressed, predetermined wireless signal is transmitted through a transmitter 18. Accordingly, electric power consumption of the portable instruments can be suppressed to a minimum without damaging convenience of an operator.</p> |
