| 摘要 |
The printed circuit card (6) carries electronic components, and the closed chamber (5) is formed by the printed circuit, the inner surfaces (1a, 1a') of the bottom part (1a) of the appts., the side and/or upper inner walls of the appts., and/or one or more intermediary walls (7) projecting from the bottom part. The cover (1b) of the appts. is of one piece construction. The walls projecting from the bottom part limit two part chambers (5, 5a) within the appts., and the printed circuit seals the walls on its underside. The first part chamber forms the closed chamber, whilst the other forms a combined in and out space for leads and connections to the components on the printed circuit. The printed circuit, the intermediary walls and possibly one or more of the limiting components (10, 11) incorporated function as acoustic stops between the microphone part of the telephone appts. and the loudspeaker (2). |
