| 摘要 |
PURPOSE:To enable the setting of lens or mirror in multistage positions by controlling only the movement of the lens or the mirror by providing an intermediate stopper construction which functions as a stopper automatically and mechanically or releases said function. CONSTITUTION:When a lens base 2 is moved by the rotation of a pulley 9 in a direction A, a positioning pin 4 starts moving and advances beyond the stopper part 19 of a stopper member. When the rotation of the pulley 9 is changed to a direction C, the 1st engaging surface 19a of the stopper part 19 regulates the movement of the pin 4, thereby defining the set position of the base 2. In other words, a stopper member 15 functions indpendently always as a stopper in the backward direction with respect to the movement of the pin 4 and permits always the passage of the pin in the forward direction. The above-desscribed movement of the pin 4, that is, the movement of the base 2 is set beforehand in the control circuit for driving a reversible motor 6. |
