| 摘要 |
PURPOSE:To drive directly a titled speaker with an optical signal, by forming an element having a photoelectric motive foce effect on a voice coil, generating a current to the voice coil with the optical signal to drive a diaphragm. CONSTITUTION:The voice coil 5 forms a closed loop at each turn and elements 11, 11' having a photoelectric motive force effect are arranged on the coil. Optical signal leading-in slits 12, 12' are passed through the elements 11, 11' of the coil 5 constituted in this way, optical signals 13, 13' are applied respectively and a current in response to the optical signal is generated in the coil 5. The diaphragm system is driven with the mutual operation between the current and the DC magnetic field of the magnetic circuit. Thus, an acoustic signal in response to the signal is reproduced by driving an oscillation system with the optical signals 13, 13' in this way. |
