| 摘要 |
An optical fiber deflection device is described in which an electrical transducer is used for deflecting the fiber in response to an electrical control signal in order to deflect a light beam transmitted through such fiber. The transducer includes a nonmagnetic deflector means attached to the fiber and connected to an electrical current source, for deflection of the fiber by movement of the deflector means. In one embodiment employing an electromagnetic transducer, an electrical conductor is attached along the length of the fiber and is connected to a D.C. current source to produce a magnetic field around the conductor so that they may be deflected by pairs of electromagnetic coils positioned adjacent the side of the conductor when a control signal is applied to such coils. Alternatively, the control signal can be applied to the conductor attached to the optical fiber and a D.C. current caused to flow through the electromagnetic coils. Other embodiments of the invention use a piezoelectric transducer means including a piezoelectric element attached to the optical fiber so that they are deflected in response to a control signal applied to such element. In still another embodiment of the invention, the electromagnetic transducer means includes electromagnetic coils provided around a pair of magnetostrictive wires each having one end fixed and their other ends attached to the fiber, so that such wires expand and contract to deflect the fiber when a control signal is applied to such coils. In a further embodiment, a thermoelectric transducer means is used including a thermal expansion element, such as a bimetal strip, attached to the fiber and an electrical heating element supported adjacent to such expansion member so that when a control signal is applied to such heating element, the expansion member bends an amount corresponding to the current of such signal to deflect the fiber.
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