| 摘要 |
PROBLEM TO BE SOLVED: To provide a vibration-proof helical antenna with improved durability. SOLUTION: An antenna pattern 2, made of a conductor, is formed in a helix shape along the circumferential face of a cylindrical body 1, in which a flexible insulation film is made round into a tubular shape and fixed in its form. A circuit board 3 is mounted and fixed at one edge of the cylindrical body 1 in the elongated axial direction. The circuit pattern 4 formed on the circuit board is connected to the antenna pattern at a soldered connection part 5. A fixing part 6, in which a prescribed part of the cylindrical body 1 other than the antenna-pattern formed part is fixed to the circuit board, is provided.
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