Lens Driving Device and Camera Module Comprising Same

摘要

A lens driving device according to an embodiment comprises: a movable unit on which at least one lens is mounted; a first coil and a driving magnet which face and interact with each other such that the movable unit is moved in the optical axis direction of the lens; a position sensor for sensing the position of the movable unit in the optical axis direction or a driver comprising the position sensor; and a positively magnetized magnet arranged to face the position sensor or the driver, wherein the positively magnetized magnet comprises a first side surface, which faces the position sensor and has a first polarity, and a second side surface, which faces the position sensor, which is arranged to be spaced from the first side surface in a direction parallel with the optical axis direction or arranged to abut the first side surface, and which has a second polarity that is the opposite of the first polarity of the first side surface, and the length of the first side surface in the optical axis direction may be equal to or larger than the length of the second side surface in the optical axis direction.

主权项

1. A lens driving device, comprising:
a bobbin, at least one lens being mounted to the bobbin and a coil unit being disposed around an outer peripheral surface of the bobbin; a housing member, driving magnets being mounted to positions corresponding to the coil unit in the housing member; upper and lower elastic members resiliently supporting movement of the bobbin in a direction parallel to an optical axis direction of the lens, the upper elastic member having one end coupled to a top surface of the bobbin and the lower elastic member having one end coupled to a bottom surface of the bobbin; and a sensing unit sensing movement of the bobbin in the direction parallel to the optical axis direction, wherein the sensing unit includes: a sensing magnet mounted to the outer peripheral surface of the bobbin; and a circuit board mounted to a side wall of the housing member, a position sensor being disposed on an inner side surface thereof facing the sensing magnet.