| 摘要 |
PURPOSE:To collect excellently bass at a distance without masking with a sound source near a cine camera at the time of remote photographing, by adjusting the directivity of a microphone in accordance with the rotation of the focus ring or zoom ring of the cine camera. CONSTITUTION:On the circumferential surface of lens body tube 2, ring conductors L differing in length are arranged and on the internal circumferential surface of focus ring 1, sliders S are arranged; conductor L and slider S constitute a switch. A microphone connected to this switch consists of circular vibrators A, B and C of piezoelectric films and holding members arranged on hemispheric substrate 5 coaxially with main axis M and radially. Once the focus is adjusted by turning the focus ring, a switch is selected and a vibrator is accordingly selected to fix the synthetic directivity of the microphone. |
