| 摘要 |
PURPOSE:To make easy the assembling to be automized and to make simple the adjustment, by forming a pair of resonant coils with metal together with the electrodes for trimmer capacitor. CONSTITUTION:In the tuning circuit of UHF tuner, the resonant coil is formed with the two coils 14 and 15 of U-shaped form the both ends of which are connected unifiedly, and the trimmer capacitor 5 (5a constitutes the connection with the coil 15, 5b constitutes the trimmer capacitor, and the capacitance value is set by adjusting the air gap between the wall surface 13a of the chassis 13 and 5b.) is unifiedly formed. The adjustment of the resonant inductance is changed for the coupling coefficient M of the coils 14 and 15. That is, it can be made by changing the distance between the coils 14 and 15 (slit 16). Further, since the coils 14 and 15 can be made by punching the metal sheet, the accuracy of size is high, and the dispersion in the resonant inductance is small. |
