| 摘要 |
PURPOSE:To improve channel-selection precision by providing the method of absorbing play between a channel-selecting member and fit-in holes engaging with the member being slidable. CONSTITUTION:Horizontal moving plates 40a and 40b are connected together through link 41 and two pins to move in the opposite directions, and on those horizontal moving plates, projection parts 40a' and 40b' are provided. With channel- selecting member 20 pushed, cam surfaces 24a' and 24b' of cam plates 24a and 24b stored with a reception frequency press against projection parts 40a' and 40b', so that vertical force N will operate on the cam surfaces by pressing. As a result play between channel-selecting member 20 and its fit-in holes (a) and (b) is absorbed by generated repulsion. Therefore, channel-selecting member 20 advances straight all the time, the horizontal displacement of horizontal moving plates 40a and 40b is invariably constant, and the displacement of a variable tuning element concerned with it is always constant. Thus, the channel-selection precision can be improved. |
