| 摘要 |
A keyless entry system transmitter that achieves both a reduction in power consumption when transmitting radio signals, and enhances system convenience by boosting transmission power in cases where required. A set-voltage value corresponding to a function specified by operation of an operation switch is read from a corresponding-voltage memory portion, and this read set-voltage value is output to a DAC. Accordingly, when operation specifying the same function is again performed with the operation switch before a predetermined timeout time clocked by a timer has elapsed, a counter is incremented, and a voltage-setting output to the DAC increases in accordance with a count value thereof. As a result, voltage supplied to a transmitter unit through a regulator increases as well. Consequently, transmission power of a remote-control signal sent via a transmission antenna is also increased.
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