| 摘要 |
PURPOSE:To form a focus controller causing no noise, by providing an air vent extracting the air enclosed in a space formed between a movable part and a fixed part. CONSTITUTION:The air vent 15 for extracting the air enclosed in a space formed between the movable part and the fixed part is provided. A holder 16 fixing a lens 7, a coil ring 17 holding the coil 4, and a support 18 holding the coil ring 17 to the holder 16 are provided by taking the efficiency extracting air into consideration to improve the efficiency of air extraction of large air vent 15. That is, the bottom of the coil holder 5 is held by the support 18, the area passing the air is increased more than the area intercepting the air, and the efficiency of air extraction is increased further. Thus, the noise produced by compression and expansion of the air in the space formed between the movable part and the fixed part of the focus controller is almost eliminated. |
