CN107528997B

CN107528997B - Lens module position control device

Info

Publication number: CN107528997B
Application number: CN201611062656.1A
Authority: CN
Inventors: 金奎傊; 闵庚重
Original assignee: Samsung Electro Mechanics Co Ltd
Current assignee: Samsung Electro Mechanics Co Ltd
Priority date: 2016-06-17
Filing date: 2016-11-25
Publication date: 2020-07-07
Anticipated expiration: 2036-11-25
Also published as: KR20170142397A; CN107528997A; KR102505436B1

Abstract

The invention discloses a lens module position control device and a camera module comprising the same. The control device according to an embodiment includes: a first wire connected to the lens module, arranged in a first direction, and having a variable length; a second wire connected to the lens module, arranged in a second direction, and having a variable length; a third wire connected to the first wire, arranged in the second direction, and having a variable length; a fourth wire connected to the second wire, arranged in the first direction, and having a variable length; a sensor sensing movement and rotation of the lens module; a controller electrically connected to the first, second, third and fourth wires, and controlling the lengths of the first and fourth wires based on the movement in the first direction sensed by the sensor, controlling the lengths of the second and third wires based on the movement in the second direction sensed by the sensor, and controlling the lengths of the first, second, third and fourth wires based on the rotation sensed by the sensor.

Description

Lens module position control device

Technical Field

The invention relates to a lens module position control device and a camera module comprising the same.

Background

In general, a technique of fixing a position of a lens module with respect to the outside when the lens module moves by means of a force applied from the outside is widely used.

For example, the camera module may include: an Optical Image Stabilizer (Optical Image Stabilizer) device can fix the position of an internal lens module even when a force from the outside is applied.

However, such a device for controlling the position of the lens module needs to be equipped with an actuator having a relatively large size and an actuator driving device. Therefore, it is difficult to reduce the size of the camera module and the position control device of the lens module.

[ Prior art documents ]

[ patent document ]

(patent document 1) Korean patent laid-open publication No. 10-0930313

Disclosure of Invention

An embodiment of the present invention is directed to a lens module position control device and a camera module including the same.

A lens module position control apparatus according to an embodiment of the present invention may include: a first wire connected to the lens module, arranged in a first direction, and having a variable length; a second wire connected to the lens module, arranged along a second direction, and having a variable length; a third wire connected to the first wire, arranged along the second direction, and having a variable length; a fourth wire connected to the second wire, arranged along the first direction, and having a variable length; a sensor for sensing movement and rotation of the lens module; and a controller electrically connected to the first, second, third, and fourth wires, and controlling lengths of the first and fourth wires based on a first direction movement sensed by the sensor, controlling lengths of the second and third wires based on a second direction movement sensed by the sensor, and controlling lengths of the first, second, third, and fourth wires based on a rotation sensed by the sensor.

A camera module according to an embodiment of the present invention includes a lens module and an Optical hand-shake prevention correction (Optical Image Stabilizer) device for correcting a hand shake of the camera module, wherein the camera module may include: a sensor for sensing relative movement of the lens module with respect to an exterior of the camera module; a plurality of Shape Memory Alloy (Shape Memory Alloy) wires, at least one of which is connected to the lens module and is connected in series to surround the lens module; and a controller which controls lengths of the plurality of shape memory alloy wires, respectively, based on a sensing result of the sensor, so that the plurality of shape memory alloy wires apply forces in a direction opposite to a direction of relative movement of the lens module with respect to the outside.

The lens module position control device according to an embodiment of the present invention reduces the size of the constituent elements that apply force to the lens module in order to control the position of the lens module, so that the overall size can be reduced and the movement and rotation of the lens module can be accurately controlled.

Drawings

Fig. 1 is a block diagram illustrating a lens module position control apparatus according to an embodiment of the present invention.

Fig. 2 is a view showing the arrangement of electric wires in the lens module position control apparatus according to an embodiment of the present invention.

Fig. 3 is a diagram illustrating a change in length of an electric wire in a lens module position control apparatus according to an embodiment of the present invention.

Fig. 4 is a block diagram exemplarily illustrating a controller in a lens module position control apparatus according to an embodiment of the present invention.

Fig. 5 is a graph illustrating a control signal of a controller in a lens module position control apparatus according to an embodiment of the present invention.

Fig. 6 is a diagram illustrating an optical anti-shake correction apparatus included in a camera module according to an embodiment of the invention.

Fig. 7 is an exploded perspective view of a camera module according to an embodiment of the invention.

Fig. 8 is an exploded perspective view of a camera module according to an embodiment of the present invention.

Description of the symbols

100: lens module position control device 110: lens module

120: the sensor 121: gyroscope sensor

122: the analysis circuit 130: shape memory alloy wire

131: first electric wire 132: second electric wire

133: third electric wire 134: fourth electric wire

140: the controller 141: logic controller

142: voltage controller 151: first part

152: second member 200: optical anti-shake correction device

1000. 2000: camera module

Detailed Description

The following detailed description of the invention refers to the accompanying drawings, which are a part of illustrative illustrations of specific embodiments in which the invention may be practiced. The various embodiments of the invention, although different from each other, should be understood as not necessarily mutually exclusive. For example, particular shapes, structures and characteristics described herein may be implemented as one embodiment without departing from the spirit and scope of the invention. Moreover, the location or arrangement of individual components within each disclosed embodiment may be modified without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled. In the drawings, like numerals refer to the same or similar functionality throughout the several views.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate the implementation of the present invention by those having ordinary knowledge in the technical field to which the present invention pertains.

Fig. 1 is a diagram illustrating a lens module position control apparatus according to an embodiment of the present invention.

Referring to fig. 1, a lens module position control apparatus 100 according to an embodiment of the present invention may include a sensor 120, a plurality of wires 130, and a controller 140.

The sensor 120 may sense the movement and rotation of the lens module 110.

At least one of the plurality of wires 130 may be connected to the lens module 110 and may have a variable length. For example, the plurality of wires 130 may include: shape Memory alloys (Shape Memory alloys) have the property that the length changes with temperature.

The controller 140 may control the movement and rotation of the lens module 110 by controlling the lengths of the plurality of wires 130.

Here, the plurality of wires 130 are components or actuators that apply force to the lens module in order to control the position of the lens module. The plurality of electric wires 130 may effectively occupy space in the lens module position control device 100 according to the design of the plurality of electric wires 130. Hereinafter, one design form of the plurality of wires 130 will be described with reference to fig. 2.

Referring to fig. 2, a lens module position control apparatus 100 according to an embodiment of the present invention may include a lens module 110, a sensor 120, a first wire 131, a second wire 132, a third wire 133, a fourth wire 134, a controller 140, a first part 151, and a second part 152.

The sensors 120 may include a gyroscope (gyro) sensor 121 and processing circuitry 122. The processing circuit 122 may calculate angle information from the angular velocity information of the lens module 110 output from the gyro sensor 121, and calculate a first-direction (x-direction) movement component, a second-direction (y-direction) movement component, and a rotation component of the lens module 110 based on the angular velocity information and the angle information.

The first wire 131 is connected to the lens module 110, is arranged along the first direction, and may have a variable length. The second wire 132 is connected to the lens module 110, is arranged along the second direction, and may have a variable length. The third wire 133 is connected to the first wire 131, is arranged along the second direction, and may have a variable length. The fourth wire 134 is connected to the second wire 132, is arranged along the first direction, and may have a variable length. Accordingly, the first, second, third, and fourth

electric wires

131, 132, 133, and 134 may effectively occupy space in the lens module position control device 100, and the overall size of the lens module position control device 100 may be reduced.

The controller 140 is electrically connected to the first, second, third and fourth

electric wires

131, 132, 133 and 134, controls the lengths of the first and fourth

electric wires

131 and 134 based on the first-direction movement sensed by the sensor 120, controls the lengths of the second and third

electric wires

132 and 133 based on the second-direction movement sensed by the sensor 120, and controls the lengths of the first, second, third and fourth

electric wires

131, 132, 133 and 134 based on the rotation sensed by the sensor 120. Accordingly, the lens module position control device 100 according to an embodiment of the present invention can accurately control the movement and rotation of the lens module.

If the first, second, third, and fourth

electric wires

131, 132, 133, and 134 include the shape memory alloy, the controller 140 may control the lengths of the first, second, third, and fourth

electric wires

131, 132, 133, and 134 by controlling the currents I1, I2, I3, and I4 flowing through the first, second, third, and fourth

electric wires

131, 132, 133, and 134.

When the magnitude of the current flowing through the first and

fourth wires

131 and 134 is changed by an equal amount of current, the lengths of the first and

fourth wires

131 and 134 may be changed by an equal amount of length. Accordingly, the lens module 110 can bear the force in the first direction.

Similarly, if the magnitude of the current flowing through the second wire 132 and the third wire 133 is changed by as much as the same amount of current, the lengths of the second wire 132 and the third wire 133 may be changed by as much as the same amount of length. Accordingly, the lens module 110 may receive a force in the second direction.

When the magnitude of the current flowing through the first and

third wires

131 and 133 is increased and the magnitude of the current flowing through the second and

fourth wires

132 and 134 is decreased, the first member 151 may be forced in the counterclockwise direction. Accordingly, the lens module 110 may rotate in a counterclockwise direction.

Similarly, when the magnitude of the current flowing through the first and

third wires

131 and 133 is decreased and the magnitude of the current flowing through the second and

fourth wires

132 and 134 is increased, the first member 151 may be forced in the clockwise direction. Accordingly, the lens module 110 may rotate in a clockwise direction.

For example, the controller 140 may include a logic controller 141 and a voltage controller 142. The logic controller 141 may generate first, second, third, and fourth Pulse Width Modulation (Pulse Width Modulation) signals corresponding to target values of currents I1, I2, I3, and I4 flowing through the first electric wire 131, the second electric wire 132, the third electric wire 133, and the fourth electric wire 134, respectively. The voltage controller 142 may control voltages applied to the first wire 131, the second wire 132, the third wire 133, and the fourth wire 134 based on the first, second, third, and fourth pulse width modulation signals. That is, the lengths of the first, second, third and

fourth wires

131, 132, 133 and 134 may be controlled by the output voltage of the voltage controller 142.

The first part 151 may physically connect and electrically insulate the first electric wire 131 from the second electric wire 132. Thus, the first member 151 can receive a physically significant force from the first electric wire 131 and the second electric wire 132, and can make the current I1 flowing through the first electric wire 131 and the current I2 flowing through the second electric wire 132 independent from each other.

The second member 152 may physically connect and electrically insulate the third wire 133 from the fourth wire 134. Thus, the second member 152 may receive a physical force from the third wire 133 and the fourth wire 134, and may make the current I3 flowing through the third wire 133 and the current I4 flowing through the fourth wire 134 independent from each other.

Also, the first part 151 may have a fixed distance with respect to the lens module 110, and the second part 152 may have a fixed distance with respect to a space in which the lens module position control apparatus 100 is disposed. Accordingly, the first, second, third and

fourth wires

131, 132, 133 and 134 apply force to the first member 151, so that the position of the lens module 110 can be controlled.

Referring to fig. 3, the plurality of wires 130 may have the following characteristics: as the temperature T decreases, the length increases and the thickness increases; as the temperature T increases, the length decreases and the thickness decreases.

The power consumed by the plurality of electric wires 130 may be configured to be larger as the current flowing through the plurality of electric wires 130 is larger. The amount of heat generated in the plurality of electric wires 130 may be configured to be larger as the power consumed in the plurality of electric wires 130 is larger. The heat may increase the temperature T of the plurality of wires 130 and decrease the length of the plurality of wires 130. Then, the controller may shorten the lengths of the plurality of electric wires 130 by increasing the current flowing through the plurality of electric wires 130 or increasing the voltage applied to the plurality of electric wires 130.

Similarly, the smaller the current flowing through the plurality of electric wires 130, the smaller the power consumed by the plurality of electric wires 130. The smaller the amount of power consumed in the plurality of electric wires 130, the smaller the amount of heat generated in the plurality of electric wires 130. The heat may cause the temperature T of the plurality of wires 130 to decrease and the length of the plurality of wires 130 to increase. Then, the controller may elongate the lengths of the plurality of electric wires 130 by reducing the current flowing through the plurality of electric wires 130 or reducing the voltage applied to the plurality of electric wires 130.

Also, the resistance of the plurality of wires 130 may have the following characteristics: proportional to the length and inversely proportional to the thickness.

When the lengths of the plurality of electric wires 130 are long in a state where the voltage applied to the plurality of electric wires 130 is constant, the resistances of the plurality of electric wires 130 may be large. If the resistance of the plurality of electric wires 130 is large, the current flowing through the plurality of electric wires 130 may be reduced. Then, the controller may detect that the magnitude of the current flowing through the plurality of wires 130 decreases, thereby determining that the length of the plurality of wires 130 is long.

Likewise, when the lengths of the plurality of electric wires 130 are short in a state where the voltage applied to the plurality of electric wires 130 is constant, the resistances of the plurality of electric wires 130 may be small. If the resistance of the plurality of electric wires 130 is small, the current flowing through the plurality of electric wires 130 may be large. Then, the controller may detect an increase in the magnitude of the current flowing through the plurality of wires 130, and determine that the length of the plurality of wires 130 is short.

For example, the correspondence between the lengths of the plurality of electric wires 130 and the currents flowing through the plurality of electric wires 130 or the voltages applied to the plurality of electric wires 130 may be sorted into a look-up table (look-up table). That is, the controller may include a memory for storing the correspondence of the look-up table, and accurately control the current flowing through the plurality of electric wires 130 or the voltage applied to the plurality of electric wires 130 based on the look-up table stored in the memory.

In addition, the controller may control not only the voltages applied to the plurality of electric wires 130 by detecting the currents flowing through the plurality of electric wires 130, but also the currents flowing through the plurality of electric wires 130 by detecting the voltages applied to the plurality of electric wires 130 according to design. Accordingly, the controller may also include a current controller instead of the voltage controller.

Referring to fig. 4, the controller may control the plurality of wires (activator) by including a logic controller (MCU), a pulse width modulation controller (PWM), a voltage controller (Driver), an analog-to-digital converter (ADC), and an ADC controller (ADC controller). However, the present invention is not limited to this, and the numerals shown on the side of the arrow indicate the operation sequence, and the letters shown on the side of the arrow indicate the operation items.

The logic controller (MCU) may be implemented by a microcontroller. The logic controller (MCU) may feedback length information of a plurality of wires (Actuator) from the ADC controller (adcc controller) and perform PID control. At this time, the logic controller MCU may determine target value information of the current flowing through each of the plurality of wires (actuators) according to PID control. The logic controller (MCU) may then communicate a signal including a target value for the current and associated wire number information to a pulse width modulation controller (PWM).

The pulse width modulation controller (PWM) discriminates a firmware (firmware) mode command or a hardware (H/W) mode command from a signal received from the logic controller (MCU), generates a pulse width modulation signal having a pulse width corresponding to a target value of a current of each of the plurality of electric wires (Actuator), and transmits the pulse width modulation signal to the voltage controller (Driver). Also, the pulse width modulation controller (PWM) may transfer a pulse width modulation signal including the start pulse and the wire number information to an ADC controller (ADC controller).

The voltage controller (Driver) may have an actuation function for a plurality of wires (activator). That is, the voltage controller (Driver) may control the voltage applied to the plurality of wires (activator) by receiving the pulse width modulation signal.

An analog-to-digital converter (ADC) may detect a current flowing through a plurality of wires (actuators) as an analog signal and convert the analog signal into a digital signal.

An ADC controller may control a sequential detection operation for a plurality of wires (actuators) of an analog-to-digital converter (ADC) using a start pulse. The ADC controller (ADC controller) is also capable of transmitting/receiving control data and feedback data to/from a logic controller (MCU). Accordingly, the driving and detection for the plurality of wires (actuators) can be performed in a sequential, independent manner.

Referring to fig. 5, a PWM Measurement Pulse represents a PWM period, and the Start Pulse ADC Start Measurement may have fluidity within the Pulse width modulation Measurement Pulse. The electric wire Address CH0Address may have number information of a plurality of electric wires. The ADC EOC and ADC Date0 may have ADC control information.

The pulse width modulation signal CH0 corresponding to the first wire, the second pulse width modulation signal CH1 corresponding to the second wire, the third pulse width modulation signal CH2 corresponding to the third wire, and the fourth pulse width modulation signal CH3 corresponding to the fourth wire may have standard values as higher values within the first, second, third, and fourth periods included in the standard period, respectively. For example, the standard period may be a period in which the first, second, third, and fourth periods are added.

Also, the Start pulse ADC Start Measure may have a standard value at a Start time point of the standard period within a pulse width of the first pulse width modulation signal CH0 corresponding to the first electric wire.

The first, second, third and fourth pulse width modulation signals CH0, CH1, CH2, CH3 may have standard values after first, second, third or fourth times from a Start time point of the Start pulse ADC Start Measure, respectively. That is, the first, second, third, and fourth pwm signals CH0, CH1, CH2, and CH3 may be synchronized with reference to the Start pulse ADC Start Measure. The Start pulse ADC Start Measure may then be generated by means of an ADC controller within the controller.

In addition, the time point at which the Start pulse ADC Start Measure takes a standard value may be changed as follows: every time a second standard period longer than the standard period elapses, a standard value is taken (or equivalently expressed as "having", elsewhere) at an intermediate time point of the standard period. That is, the location of the Start pulse ADC Start Measure may have fluidity.

The time point at which the Start pulse ADC Start Measure starts to take the standard value may be set to a time when the detection results of the plurality of electric wires are stabilized. Accordingly, the controller can stably obtain feedback from the plurality of wires. Therefore, the controller may analyze the transition signals of the plurality of wires and set a time point at which the start pulse ADC StartMeasure starts to have a standard value when the transition signals are stabilized.

Also, the pulse width of the Start pulse ADC Start Measure may have fluidity. The controller may not be able to detect the Start pulse ADC Start Measure if the pulse width is short. In the case where the pulse width is long, the control accuracy for the first, second, third, and fourth pulse width modulation signals CH0, CH1, CH2, CH3 may be reduced. Accordingly, the controller may adjust the pulse width of the start pulse adcs start Measure each time the second standard period passes.

The lens module position control apparatus according to an embodiment of the present invention can stably control the lengths of the plurality of wires by using both the hardware method and the firmware method as described above.

Referring to fig. 6, the optical hand-shake prevention correction apparatus 200 may include a sensor 220, a shape memory alloy wire 230, and a controller 240.

The optical anti-shake correction apparatus 200 may be included in a camera module together with the lens module 210. If the camera module moves at the instant the camera shutter is pressed, the image acquired by the lens module 210 may become blurred. Accordingly, the optical shake correction apparatus 200 applies a force to the lens module 210 in a direction opposite to a direction in which the lens module 210 is moved due to the movement of the camera module, so that the position of the lens module 210 can be fixed. Accordingly, the optical anti-shake correction apparatus 200 can optically correct a captured image blurred by the shake of the hand holding the camera module.

The sensor 220 may sense relative motion of the camera module 210 with respect to the exterior of the camera module. For example, the sensor 220 may include: a gyro sensor 221 for sensing an angular velocity of the lens module 210; an integrator 222 that integrates an output signal of the gyro sensor 221 in order to acquire angle information from the angular velocity information; and a filter 223 for removing noise/offset contained in the output signal of the gyro sensor 221.

The shape memory alloy wire 230 may be configured such that at least one thereof is connected to the lens modules 210 and surrounds the lens modules 210 connected in series with each other. Accordingly, the shape memory alloy wire 230 can effectively occupy a space in the optical shake correction apparatus 200, and can reduce the overall size of the optical shake correction apparatus 200 and the camera module, and can accurately control the movement and rotation of the camera module.

The controller 240 may control the lengths of the shape memory alloy wires 230, respectively, based on the sensing result of the sensor 230 in the following manner: the shape memory alloy wire 230 is caused to apply a force in a direction opposite to the direction of the relative movement of the lens module 210 with respect to the outside.

For example, the controller 240 may include: a PID controller 241 receiving the sensing result of the sensor 220 and the feedback information transmitted from the shape memory alloy wire 230 from the adder 245 and controlling PID; an analog-to-digital converter 242 that converts the digital signal output from the PID controller 241 into an analog signal; an amplifier 243 for amplifying the feedback signal transmitted from the shape memory alloy wire 230; an analog-to-digital converter 244 converts the analog signal output from the amplifier 243 into a digital signal.

Referring to fig. 7, a camera module 1000 according to an embodiment of the present invention may include a lens module 1400.

The lens module 1400 may include: a housing 1410 for receiving a lens carrier 1420 having a lens barrel 1430; a stopper 1440 for restricting the movement of the lens carrier 1420 along the optical axis 1; shield can 1450 to wrap around housing 1410.

The lens barrel 1430 may be assembled from at least one lens by an adhesive or a screw coupling manner.

The controller 1100 and the shape memory alloy wire 1330 may be respectively disposed at one surface of the substrate 1200, and the position of the lens carrier 1420 may be controlled by applying a force to the lens carrier 1420. Here, the controller 1100 and the shape memory alloy wire 1330 may be implemented the same as the controller and the plurality of wires shown in fig. 1. The shape memory alloy wire 1330 does not need to be provided with a magnetic body and a hall sensor (hall sensor), and may not be stacked, so that the overall size of the camera module 1000 can be reduced.

The substrate 1200 may be a printed circuit board, and may be provided at a side of the case 1410.

The ball bearing may be disposed at an inner guide of the housing 1410 and may support movement along the optical axis of the lens carrier 1420 through a rolling operation.

The ball bearing may be disposed at an inner guide of the housing 1410, and a lubricant may be applied to a surface of the ball bearing.

The image sensor module 1500 may be disposed at a lower portion of the case 1410, and the image sensor module 1500 may include an image sensor 1510, a flexible printed circuit 1520, and a circuit board 1530. The image sensor 1510 may be disposed at an imaging surface and mounted to one surface of the circuit board 1530 through the wire bonding member 1540. The flexible printed circuit 1520 may extend from the circuit board 1530 to be connected to an internal circuit of an electronic device such as a camera or a mobile communication terminal, which will be described later. One side end of the circuit board 1530 may be provided with a coupling part 1560 coupled with the substrate 1200. Furthermore, the image sensor module 1500 may further include: the infrared filter 1550 performs filtering on the incident image and transmits to the image sensor 1510.

Referring to fig. 8, a camera module 2000 according to an embodiment of the present invention may include a lens module 2400, and the lens module 2400 may include a lens barrel 2410, which may include a lens carrier, a case, and a shield case, as in fig. 5, although not illustrated.

The outer circumferential surface of the lens barrel 2410 may be disposed with a shape memory alloy wire 2430. The shape memory alloy wire 2430 may be wound around the outer circumferential surface of the lens barrel 2410. For example, the shape memory alloy wire 2430 may have 4 structures arranged in a quadrangular form.

The shape memory alloy wire 2430 can control the position of the lens barrel 2410 by applying a force to the lens barrel 2410, and can be implemented as the plurality of wires shown in fig. 1. The shape memory alloy wire 2430 does not need to be provided with a magnetic body and a hall sensor (hall sensor), and can be formed without stacking, so that the overall size of the camera module 2000 can be reduced.

The lens module 2400 may include a frame 2444 for supporting an outer shape of the lens module 2400, and may further include a first elastic member 2472 and a second elastic member 2474 for supporting movement toward an optical axis direction of the lens barrel 2410. The lower portion of the frame 2444 may have the image sensor module 2500 and the controller 2100, and the image sensor module 2500 and the controller 2100 may be constructed as one integrated circuit.

The current from the controller 2100 may be transferred to the shape memory alloy wire 2430 through a suspension wire (suspension wire)2465, and to this end, the edge portion 2475 of the first elastic member 2472 may include a suspension wire coupling portion 2475-2 coupled to one end 2465-2 of the suspension wire 2465. The suspension wire coupling portion 2475-2 may have a hole shape.

In addition, a sensor 2443 for sensing the movement of the lens module 2400 may be included. The sensor 2443 may be implemented identically to the sensor shown in fig. 1.

The present invention has been described above by way of examples, but the present invention is not limited to the examples described above, and various modifications can be made by those having ordinary skill in the art to which the present invention pertains without departing from the spirit of the present invention claimed in the claims.

Claims

1. A lens module position control apparatus comprising:

a first wire connected to the lens module, arranged in a first direction, and having a variable length;

a second wire connected to the lens module, arranged along a second direction, and having a variable length;

a third wire connected to the first wire, arranged along the second direction, and having a variable length;

a fourth wire connected to the second wire, arranged along the first direction, and having a variable length;

a sensor for sensing movement and rotation of the lens module;

a controller electrically connected to the first, second, third, and fourth electric wires, and controlling lengths of the first and fourth electric wires based on the movement of the first direction sensed by the sensor to move the lens module in the first direction, and controlling lengths of the second and third electric wires based on the movement of the second direction sensed by the sensor to move the lens module in the second direction, and controlling lengths of the first, second, third, and fourth electric wires based on the rotation sensed by the sensor to rotate the lens module on a plane formed by the first and second directions; and

a first member for physically connecting and electrically insulating the first electric wire and the second electric wire; and

a second member for physically connecting and electrically insulating the third electric wire and the fourth electric wire,

wherein the controller performs control in such a manner that:

changing the magnitude of the current flowing through the first and fourth wires by as much as an equal amount of current based on the first directional movement sensed by the sensor,

changing the magnitude of the current flowing through the second and third wires by as much as an equal amount of current based on the second directional movement sensed by the sensor,

increasing the magnitude of the current flowing through the first and third electric wires and decreasing the magnitude of the current flowing through the second and fourth electric wires based on a rotation of a direction sensed by the sensor,

decreasing the magnitude of the current flowing through the first and third electric wires and increasing the magnitude of the current flowing through the second and fourth electric wires based on the rotation of the other direction sensed by the sensor,

wherein the lens module has a fixed distance with respect to the first part, and the second part is fixed with respect to a space in which the lens module position control device is disposed.

2. The lens module position control apparatus of claim 1, wherein the first, second, third and fourth wires comprise a shape memory alloy.

3. The lens module position control apparatus as claimed in claim 1, wherein the sensor is a gyro sensor, the lens module position control apparatus further comprising:

a processing circuit calculating a first direction movement component, a second direction movement component, and a rotation component of the lens module based on a sensing result of the gyro sensor.

4. The lens module position control apparatus of claim 1, wherein the controller senses currents flowing through the first, second, third and fourth wires, and determines target values of the currents flowing through the first, second, third and fourth wires based on the sensed currents and the movement and rotation of the lens module sensed by the sensor.

5. The lens module position control apparatus of claim 4, wherein the controller comprises:

a logic controller for generating first, second, third and fourth pulse width modulation signals corresponding to target values of currents flowing through the first, second, third and fourth electric wires, respectively; and

a voltage controller controlling voltages applied to the first wire, the second wire, the third wire, and the fourth wire based on the first, second, third, and fourth pulse width modulation signals,

the first, second, third and fourth PWM signals have standard values within the first, second, third and fourth periods of the standard period, respectively.

6. The lens module position control apparatus of claim 5,

the logic controller generates a start pulse having a standard value at a start time point of the standard period, and changes a value of the start pulse to a change time point or a width of the start pulse with the standard value at a middle time point of the standard period each time a second standard period longer than the standard period elapses,

the first, second, third and fourth pulse width modulation signals have standard values after first, second, third or fourth times, respectively, have elapsed from a start time point of the start pulse.