| 摘要 |
<p>PURPOSE:To make a rotary detecting function positive, by installing magnet mounted on a rotating shaft, electromagnetic converting element fixed facing to the outer periphery of the magnet and back-yoke covering the outer peripheries of said magnet and electromagnet converting element. CONSTITUTION:The rotary detecting apparatus is equipped with a cylindrical magnet 4. And, this magnet 4 is fixed coaxial with a pulley of a tape counter 1 and driven by a rotating shaft of a tape driving mechanism proper through a belt 3. On the other hand, a printed circuit board 6 is fixed on a base plate 9, a hole elements 5 fixed on this base plate 6 faces to the outer periphery of the magnet 4. And, on the base plate 9, a back-yoke 7, an iron plate shaped into a cylinder, is arranged in a position surrounding magnet 4 and hole element 5. By this construction simple grasp of magnetic fluxes and positive rotary detection can be available.</p> |
