| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a portable machine capable of prolonging service life of a battery. <P>SOLUTION: When a request signal transmitted from a door unlock controller 3 is received by a reception circuit 10, electric power is supplied by electromagnetic wave energy obtained from the request signal to start the reception circuit 10. That is, at the time of waiting for reception of the request signal which is at a stage before the request signal is sent, electric power is not supplied at all to the reception circuit 10 from the battery 40. For this reason, when waiting for reception of the request signal, all the electric power of the battery 40 is not consumed by the reception circuit 10, thereby prolonging service life of the battery 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
