| 摘要 |
<p>A movement distance measurement device compact and having high durability. A device (5) for measuring the distance of movement of a first lens group holding frame has a first encoder scale (51), a first optical sensor (52), a first interrupter (53), and a control section. The first encoder scale (51) is constructed so as to slide as a first lens group holding frame (11) slides. Further, a device (6) for measuring the distance of movement of a second lens group holding frame has a second encoder scale (61), a second optical sensor (62), a second interrupter (63), and a control section. The second encoder scale (61) is constructed so as to slide as the second lens group holding frame (12) slides.</p> |
