| 摘要 |
PROBLEM TO BE SOLVED: To provide an actuator unit which has high resistance to shocks such as knocking and dropping, is advantageous for miniaturization by simple structure and constitution, has high reliability, and is suitably applied to an optical device such as a subminiature camera. SOLUTION: A stepping motor is fixed on a box-like supporting body 1 and a nut plate 4 is engaged with a lead screw 3 formed on an output shaft 20 of the stepping motor. A lens frame body 30 is arranged on the side of a through hole 13 and a guide pin 5 is erected between the output shaft 20 and an optical axis L. A concentric contact surface 34 is formed on the lower part of an approximately cylindrical body of the lens frame body 30, the nut plate 4 is mounted on a link part 32 projected from the body and an upper spring member 6 and a lower spring member 7 are arranged on the upper and lower parts of the nut plate 4 to hold it. The guide pin 5 is connected to the nut plate 4 through the link part 32. A receiving surface 8 corresponding to the contact surface 34 is formed on the bottom of the supporting body 1 and the abutting (b) of the contact surface 34 on the receiving surface 8 is set as the lower limit of movement. COPYRIGHT: (C)2006,JPO&NCIPI
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