Patent ID: 8564402

Claim:
A lock system that unlocks a lock with an unlock signal comprising: a controlling unit that generates irregular transmission timings corresponding to reference time-cycle signals respectively by adding a random time deviation to each of the reference time-cycle signals, each of the reference time-cycle signals being generated at reference time-cycle intervals; a button switch that transmits the unlock signal; a transmitting unit that transmits the unlock signal at each of the irregular transmission timings and when the button switch is operated; and an unlocking unit that unlocks a lock in a case where the unlocking unit receives the unlock signal transmitted from the transmitting unit within a predetermined time, wherein each of the random time deviations added to the reference time-cycle signal is different from each other, each time difference between the reference time-cycle signal and the unlock signal is different from each other, and the unlock signal is transmitted from the transmitting unit at the irregular transmission timings of irregular intervals, and a length of a preamble which is added to the unlock signal is different between the unlock signal transmitted at the irregular transmission timings and the unlock signal transmitted when the button switch is operated.