| 摘要 |
PURPOSE:To obtain a crystal oscillating unit for attaining simple construction, small space, miniaturization and low cost by providing a printed circuit board, a hole provided to this board, a crystal oscillator fixed in said hole and a protective member stopping up and sealing the hole. CONSTITUTION:An IC chip 9, a chip capacitor 10 and lead terminals 15 are mounted on the printed board 14 provided with a through-hole 18, and a couple of holding metal fixtures 12 are fitted oppositely to each other in the through- hole 18. Then, wiring is applied by a bonding wire 16, the crystal oscillator 11 is fixed to the holding metal fixtures 12 by an adhesives 13, upper and lower openings of the through-hole 18 are stopped up by a protective film 17 and the whole part except a part at the outside part of the lead terminals 15 is molded and sealed by an expoy resin or the like. Since the crystal oscillator 11 is imbedded to the printed board 14 in this way, the construction is simplified, the space is decreased and miniaturization and low cost are attained. |
