| 摘要 |
PURPOSE:To make a device simple and small-sized, and also to realize its high accuracy, by screwing a lens holding tube into a rotor, also fitting a guide piece of the lens holding tube into a rotor, also fitting a guide piece of the lens holding tube into a guide groove of a frame, and rotating the rotor by energizing a stator. CONSTITUTION:An external thread 21a is formed on the outside circumference of a lens holding tube 21, and a guide pin 21b is placed so as to be projected, on the side circumference adjacent to one end side. Also, the axial core side of a rotor 22 is hollowed, and on its inside surface, an internal thread 22b to be screwed into the external thread 21a of the lens holding tube 21 is formed, the lens holding tube 21 is screwed into the rotor 22, and this rotator 22 is installed to a frame 24 through bearings 25, 25'. To the inside of the frame 24, a stator 23 is installed so as to be opposed to the rotor 22, and the rotor 22 is rotated by switching in order an energizing current flowing in the stator 23. Subsequently, the guide pin 21b provided on the lens holding tube 21 is fitted into a guide groove 24a of the frame 24, so that a rotating motion of the rotor 22 is converted and transferred to a linear motion of the lens holding tube 21. |
