The present embodiment relates to a lens driving device comprising: a lens barrel; a lens disposed in the lens barrel; and a driving unit disposed in the lens barrel, wherein: the driving unit includes a piezoelectric element expanding or contracting in a direction perpendicular to an optical axis direction of the lens when a voltage is applied thereto, a first member disposed on the piezoelectric element, and a second member coupled to the first member and disposed in the lens barrel; the lens barrel moves in the optical axis direction of the lens when the voltage is applied to the piezoelectric element; and a first length in the lengthwise direction of the first member is shorter than a second length in the lengthwise direction of the second member.

A camera module according to an embodiment of the present invention may comprise: a housing including an upper plate section and a side plate section extending from the upper plate section; a first lens disposed on the upper plate section of the housing; a first lens barrel disposed below the upper plate section in the housing; a second lens barrel disposed below the first lens barrel in the housing; a second lens disposed in the first lens barrel; a third lens disposed in the second lens barrel; a first piezo motor which is disposed in the housing and coupled to the first lens barrel, and moves the first lens barrel; and a second piezo motor which is disposed in the housing and coupled to the second lens barrel, and moves the second lens barrel.

An optical element driving mechanism is provided, including a fixed part, a movable part, and a driving assembly. The movable part includes a holder, and a supporting element. The holder holds an optical element. The supporting element is connected to the holder. The driving assembly drives the movable part to move relative to the fixed part. The holder uses the supporting element as a fulcrum and moves relative to the fixed part around the first axis and the second axis. The first axis is not parallel to the second axis.

An optical element driving mechanism is provided. The optical element driving mechanism includes a movable portion, a fixed portion, a driving assembly, and a stopping assembly. The movable portion is used for connecting to an optical element having a main axis. The movable portion is movable relative to the fixed portion. The driving assembly is disposed on the fixed portion or the movable portion to move the movable portion relative to the fixed portion. The stopping assembly connects to the movable portion and the fixed portion to limit the range of motion of the movable portion relative to the fixed portion.

A camera actuator according to an embodiment includes a housing; a prism unit disposed in the housing; and a first driving unit for tilting the prism unit; wherein the prism unit includes: the prism; and a prism mover disposed to surround the prism, and a second driving unit disposed between the prism and the prism mover and tilting the prism, and wherein a driving displacement of the second driving unit is smaller than a driving displacement of the first driving unit.

A lens driving device according to an embodiment includes a moving part including a lens; a driving part for driving the moving part in an optical axis direction; and a sensing part for sensing a position of the moving part; wherein the moving part includes: a magnet scaler in which a first pole and a second pole are alternately arranged in a first direction; and a reference magnet corresponding to the magnet scaler and having a first pole and a second pole disposed in a second direction perpendicular to the first direction.

A camera actuator according to an embodiment includes a housing; a prism unit disposed in the housing; a first driving unit disposed in the housing and controlling a tilt of the prism unit; and a second driving unit disposed under the housing and controlling a tilt of the housing, wherein the first driving unit includes a first piezoelectric device disposed in a region overlapping a center of the prism unit in a first direction, wherein the second driving unit includes a second piezoelectric device disposed in a region overlapping the center of the prism unit in a second direction different from the first direction, wherein the prism unit is provided to be tiltable in the second direction by the first driving unit, and wherein the housing is provided to be tiltable in the first direction by the second driving unit.

A vibratory actuator control apparatus includes a vibrating member, having an electro-mechanical energy conversion element, and a contact member that contacts the vibrating member. In a second case where the vibrating member and the contact member are brought from a stationary state to a stopped state, an operation sequentially passes through a third stage and a fourth stage. The third stage is for decelerating a relative movement driving speed by applying a driving voltage to the electro-mechanical energy conversion element while maintaining a control parameter of the driving voltage constant and increasing a driving frequency. The fourth stage is for decelerating the driving speed by applying the driving voltage to the electro-mechanical energy conversion element while maintaining the driving frequency constant and decreasing the control parameter of the driving voltage. A start frequency is set based on the driving frequency corresponding to a predetermined driving speed in the third stage.

A vibration wave motor includes an annular oscillator, and an annular moving member provided so as to be in press contact with the oscillator. The oscillator includes an annular vibrating plate, and an annular piezoelectric element provided on a first surface of the vibrating plate. The vibrating plate is in contact with the moving member via a second surface of the vibrating plate, which is opposite the first surface. The piezoelectric element has a plurality of drive phase electrodes. When a driving region represents a region of the oscillator in which the drive phase electrodes are provided, and a non-driving region represents a remaining region of the oscillator, a contact area ratio S1 between the vibrating plate and the moving member in the non-driving region is less than a contact area ratio S2 between the vibrating plate and the moving member in the driving region.

A vibration type actuator includes a vibrating body including an elastic body and an electro-mechanical energy conversion element, a contact body contacting the vibrating body, a flexible printed board provided with a concave portion on a surface opposite to a surface contacting the electro-mechanical energy conversion element and configured to supply electric power to the electro-mechanical energy conversion element, and a holding member provided with a projection portion engaging with the concave portion.