| 摘要 |
PURPOSE:To make a magnetic circuit simpler and, at the same time, improve the assembling property of the circuit, by fixedly fitting a coil to a mirror which is fitted to a holder through a supporting rod and elastic member and supported by the elastic member under a revolution-free condition and providing a pair of permanent magnets to the outside of the coil under a symmetrical condition. CONSTITUTION:A magnetic circuit is composed only of permanent magnets 3a and 3b arranged in a symmetrical condition and magnetized so that the faces of the magnets 3a and 3b facing to each other have the polarity of N-pole and S- pole, respectively. That is to say, the magnetic circuit can operate sufficiently without using a conventional yoke. A coil 4 is installed between the permanent magnets 3a and 3b. The magnetic flux flows from the magnet 3a to the other magnet 3b. When an electric current is made to flow to the coil 4, a mirror 6 revolves in the direction of the arrow (a) around a part of an elastic member 8. Since the necessity of any yoke is eliminated from the magnetic circuit, a deflecting mirror device which is simple in constitution and has an excellent assembling property is obtained. |
