| 摘要 |
PURPOSE: An apparatus for finely correcting a focus length is provided to improve uniformity of a focus shape and reduce the volume of an optical system. CONSTITUTION: An apparatus for finely correcting a focus length includes an upper plate(11) having an actuating hole, an upper fixed electrode(21) formed in the actuating hole, an insulating layer(13) combined with the bottom side of the upper plate, a lower plate(12) that has an actuating hole corresponding to the actuating hole of the upper plate and is combined with the bottom side of the upper plate, and a lower fixed electrode formed in the actuating hole of the lower plate. The apparatus further includes a movable plate(30) that has a focus lens hole, is placed in the actuating hole and combined with the bottom side of the upper plate, a movable electrode formed opposite to the fixed electrode, a fixed electrode pad for applying power to the fixed electrode, a movable electrode pad for applying power to the movable electrode, and a focus lens set in the focus lens hole. |
