| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce size by obviating a mechanism for changing rotary motion to linear motion, and to prevent the occurrence of radion wave jamming since a brush is not used by using a linear DC motor as a driving means. SOLUTION: A pulse current is supplied from a driving circuit, and at electric current ON time, a yoke 219, a spindle holder 217, magnets 231, 223 and a spindle 215 move in the arrow A direction by reaction of propulsion generated in coils 205, 207. At this time, a coil spring 225 is compressed, and when an electric current is cut off, the coil spring 225 moves in the arrow B direction by the elastic resiliency, and returns to a former position. When the spindle 215 moves in the arrow B direction, pressure in a diaphragm 105 reduces, and a neck part of an intake valve 119 extends, so that outside air enters the diaphragm 105 from an intake port 115. When the spindle 215 moves in the arrow A direction, the pressure increases, and a neck part of an exhaust valve 129 extends, so that air in the diaphragm 105 goes out of an air delivery port 127 and an air delivery port 113.</p> |
