| 摘要 |
<p>PURPOSE:To ensure an adjustment of the sound volume to an optional level with simple constitution, by providing a sound volume control filter which gives a mechanical control to the sound volume obtained through the speaker provided at the utternance part. CONSTITUTION:The voice uttering window 5b is drilled to the case 1 and at the upper part of the voice utterance part 5. The upper and lower filters 5c and 5d are provided between the window 5b and the speaker 5a to give a control to the output of the voice uttered through the speaker 5a. The filter 5c is connected with the slide switch 5g into a body and can be slided along the groove. On the other hand, the filter 5d is fitted fixedly into the speaker box 7. In addition, the open windows 5e and 5f are provided to the filters 5c and 5d in both the vertical and horizontal directions. Thus the sound volume can be controlled by moving the switch 5g. In such way, an optional level of sound volume is obtained with a simple constitution.</p> |
