A VCM (voice coil motor) is disclosed, the VCM including: a rotor including a cylindrical bobbin for accommodating a lens and protruded at a bottom end with a boss, and a coil block arranged at a periphery of the bobbin; a stator including a magnet facing the coil block and a yoke fixing the magnet; and an elastic member including a first elastic member formed with a through hole coupled to the boss of the bobbin and a second elastic member coupled to an upper end facing the bottom end of the bobbin; wherein the boss is formed with a disengagement prevention unit inhibiting the first elastic member from being disengaged from the boss, and the first elastic member is formed with a coupling unit contacting a joint where the disengagement prevention unit and the coupling unit meet.

A camera module includes a camera motor, a lens, an image sensor assembly, and a variable aperture. The camera motor includes a focusing part, and the focusing part includes a base, a carrier, and a driver. The driver is fastened to the base and is configured to drive the carrier to move relative to the base in a specified direction. The carrier forms an installation hole in a specified direction. The lens is fastened in the installation hole, and an optical axis of the lens is parallel to the specified direction. The variable aperture is fastened on the carrier and located on a light incoming side of the lens. The image sensor assembly is disposed at one end of that is of the base and that is away from the variable aperture. Both of the variable aperture and the lens are disposed on the carrier of the focusing part.

A lens driving device and a driving method thereof are provided. The lens driving device includes a lens frame, a magnetic group, a driving element group and a control device. The lens frame carries at least one optical element. The magnetic group includes a plurality of pairs of magnetic elements. The driving element group includes at least two coils. The control device supplies power to the driving element group so that the lens frame is driven by the driving element group to move. The driving element group is disposed on the lens frame, and the amount of the lens frame is equal to that of the driving element group. The control device in a first driving state supplies the power to the coils in sequence so that the driving element group is moved from a pair of magnetic elements to another pair of magnetic elements.

Provided is an optical actuator that includes an elastic support member having a small influence on the drivability of a lens guide and having a high durability by configuring the optical actuator to include: a fixed-side member; a movable-side member that is arranged apart from the fixed-side member in a first direction orthogonal to an optical axis, holds a lens part, and moves by power of a driving part; and an elastic support member that supports the movable-side member with respect to the fixed-side member, and by configuring the optical actuator such that the elastic support member includes an elastic deformation part formed by at least a pair of linear parts arranged so as to follow each other in a state of having an interval between the pair of linear parts.

The imaging apparatus comprises a retractable structure with active and inactive positions. An outermost lens group and a lens group actuator are movable along an optical axis. In the inactive position the lens group and the lens group actuator reside close to an image sensor. The lens group actuator is positioned to the same level as the image sensor. In the active position the outermost lens group and the lens group actuator are further from the image sensor along the optical axis. The retractable structure may protrude from the device, covering the imaging apparatus. In one example the structure is reversed, the image sensor protrudes from the device while the outermost lens group is fixed to the device body.

A voice coil motor assembly including a base, a frame, an elastic sheet, a housing, and a plurality of shock-absorbing components is provided. The frame is disposed on the base. The frame includes a bottom surface, a top surface, a plurality of side walls and a support frame. One side of the elastic sheet is disposed on the top surface of the frame and the other is disposed on the support frame. The housing is disposed above the base to receive the frame and the elastic sheet. The housing includes a housing top wall and a plurality of housing side walls surrounding the housing top wall. The shock-absorbing components are disposed on the frame and are sandwiched between the frame and the housing side walls of the housing, and/or between the support frame and the housing top wall of the housing.

A voice coil motor driving device and a method for providing control signals of the same are provided. The voice coil motor driving device includes a control module, a current driving module, and an input module. The current driving module outputs a plurality of digital current signals according to a driving signal, each of the plurality of digital current signals includes a plurality of current unit signals, and each of the plurality of digital current signals is arranged in a first time period, each of the plurality of digital current signals includes a plurality of reverse current unit signals, and the plurality of reverse current unit signals are arranged in a second time period, which is at a beginning of the first time period, or arranged in a third time period, which is at the end of the first time period.

In a state in which a position sensor for focusing is viewed in the direction of an optical axis, a line connecting the position sensor for focusing to the optical axis is set as a first reference line and a line orthogonal to the first reference line and passing through the optical axis is set as a second reference line. The position sensor for focusing is disposed in a first region of the first region and a second region partitioned by the second reference line. An X-direction VCM and a Y-direction VCM are arranged in the second region. The influence of magnetism from the X-direction VCM and the Y-direction VCM on the position sensor for focusing is suppressed.

A camera module actuator includes: a magnet disposed on a lens barrel; a driving coil disposed opposite to the magnet; and a driving device including a comparer that calculates an error value by comparing a target position of the lens barrel with a current position of the lens barrel, a controller IC that generates a control signal by applying control gains to the error value, and a driving circuit that generates a driving signal in response to the control signal. The controller IC determines the control gains based on a friction coefficient between a guide groove guiding movement of the lens barrel and a ball bearing contacting the guide groove. The controller IC provides a detection signal having a gradually increasing level to the driving coil, and determines the friction coefficient based on a level of the detection signal at a point in time of movement of the lens barrel.

An optical element driving mechanism is provided. The optical element driving mechanism with a main axis includes a fixed part, a movable part, a first driving assembly, and a sensing assembly. The movable part moves relative to the fixed part. The movable part and the fixed part are arranged along the main axis. The movable part includes a frame and a holder. The holder moves relative to the frame. The first driving assembly drives the holder to move. The sensing assembly includes a reference element and a sensing element. The sensing element senses a movement of the reference element in order to sense a movement of the holder relative to the frame.