| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmitter receiver that is mainly used for the operation of an ignition switch of an automobile etc., and enables reliable communication by a simple structure.SOLUTION: A bobbin 13 which is mounted to an outer periphery of a key cylinder 1 and around which a coil 14 is wound is formed having a substantial elliptical shape or a substantial oval shape. As a result, even if a diameter in a predetermined direction of the bobbin 13 is formed small in size due to shapes or the like of other parts in the vicinity, a diameter orthogonal direction to a diameter in the predetermined direction is formed large in size, whereby the magnetic force of the coil 14 in this direction is not weakened, and a transmitter receiver can be obtained which enables reliable communication with a portable device 8 by a simple structure. |
