| 摘要 |
PURPOSE:To decrease manufacture man-hours, to eliminate the need for expensive parts and to reduce the cost of an ultrasonic wave delay line by sticking and fixing a delay medium on the surface of a printed circuit board, covering it with a metallic cover, and caulking and fixing the caulking claw of the metallic cover to the printed circuit board. CONSTITUTION:The printed circuit board 11 except a pin part on its reverse surface side is covered with copper foil and a pattern for terminal pins and a pattern for wiring are formed of copper foil on the top surface side. Further, terminal pins 12 are fitted to terminal pin pattern parts of the printed circuit board 11. The terminal pins 12 are fitted in the printed circuit board 11 and then soldered. The metallic cover 13 after the delay medium is stored is fitted to the printed circuit board 11 and caulked and fixed to the printed circuit board with claws 13a for fixation provided to the outer periphery of the metallic cover 13. Thus, the printed circuit board which is used conventionally is used as a case base without using an expensive metallic case with hermetic pins, so the cost is reduced.
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