| 摘要 |
PROBLEM TO BE SOLVED: To properly maintain high-frequency characteristics, and to properly radiate heat. SOLUTION: In a tuner device for which a printed wiring board 13 is fixed inside a metal shield case 10 and high-frequency integrated circuit elements 16 and 17 with a built-in high-frequency oscillator are mounted on one side of the printed wiring board 13, through-holes 20 and 21 passing through from one side to the other side are provided on the part, corresponding to the mounting part of the high-frequency integrated circuit elements 16 and 17 of the printed wiring board 13, heat radiation sheets 22 are provided through the through-holes 20 and 21, and the heat of the high-frequency integrated circuit elements 16 and 17 is conducted from the heat radiating sheets 22 on the other side of the printed wiring board 13 to the metal shield case 10 and radiated. COPYRIGHT: (C)2006,JPO&NCIPI
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