KR102264881B1 - Actuator for mobile terminal camera with dual msm elements and camera module for mobile terminal with same - Google Patents

Abstract

The present invention relates to an actuator for a mobile terminal camera having a dual MSM element and a camera module for a mobile terminal having the same. It consumes less power and enables real-time monitoring of the position and tilting angle of the barrel without a separate sensor.
The present invention provides an actuator for a camera of a portable terminal, a casing fixed to the portable terminal; an MSM element installed inside the casing to support the lens barrel on which the lens is mounted; and an inductor installed near the MSM element to stretch and deform the length of the MSM element while providing a magnetic field to the MSM element, wherein the lens barrel is displaced by the expansion and contraction deformation of the MSM element. .

Description

An actuator for a mobile terminal camera having a dual MSM element and a camera module for a mobile terminal having the same

The present invention relates to an actuator for a camera of a portable terminal, and in particular, with a simple structure that minimizes the number of active elements to only two, very fast autofocus and optical image stabilization are possible, consumes less power, and a lens without a separate sensor The present invention relates to an actuator for a mobile terminal camera having a dual MSM device that enables real-time monitoring of a position and a tilting angle of a barrel, and a camera module for a mobile terminal having the same.

A camera module with an auto focusing (AF) function that automatically adjusts the focus of the lens when shooting a subject is being applied not only to general digital cameras but also to mobile devices such as smartphones and tablet PCs. In addition to Auto Focusing: AF), camera modules with optical image stabilization (OIS) are also appearing one after another.

Traditionally, autofocus and image stabilization functions are performed by separate actuators in the existing camera module, complicating the camera module design and increasing the size and price. Most importantly, the height of the camera module was a huge constraint in realizing an extremely thin smartphone.

Conventionally, a special actuator was required to control movement along each axis. For example, in the case of an existing OIS using voice coil motor (VCM) technology, since each degree of freedom (DOF) requires a special VCM, two VCMs are required for two DOF OIS. In order to control the three DOFs, a separate actuator for autofocus was used, so three actuators were needed to control the three DOFs.

For autofocus, an electromagnetic motor is commonly used, such as a VCM or stepping motor (STM). They are characterized by high energy consumption and have to accommodate permanent magnets (PM) that create a stray magnetic field and increase the weight of the camera module. However, there was a problem that the OIS function could not be performed with autofocus by VCM.

VCM is the most commonly used actuator for OIS. VCM OIS had disadvantages, such as having to accommodate multiple VCM motors to control the required DOF. In addition, the VCM OIS increases the stray magnetic field due to the permanent magnet, increases the weight, and decreases the mechanical stability due to the spring for maintaining the current position of the VCM, which lowers the mechanical resonance frequency of the OIS. . In addition, there is a problem that VCM OIS cannot perform the autofocus function.

Moreover, the VCM OIS required more than two Hall sensors per VCM to monitor the position of the barrel. Due to this, there was a problem in that the price, size, and weight of the camera module were increased.

As described above, according to the prior art, it was not possible to perform both autofocus and handshake correction functions with a single actuator, and there was a problem in that a large amount of energy was consumed to maintain a constant position. In addition, since a separate actuator is required for each DOF, at least three actuators were required to implement a camera module for DOF for autofocus and two DOFs for image stabilization.

In addition, existing actuators such as VCMs require permanent magnets, which increases the weight and size of the actuators and generates an undesirable stray magnetic field. In the case of the VCM, since at least two Hall sensors are required per VCM for real-time location tracking, there is a problem in that the configuration and weight increase.

Korean Patent Publication No. 2015-0054795 (2015.05.20)

Accordingly, the present invention has been proposed to solve the problems of the related art as described above, and an object of the present invention is to enable very fast autofocus and optical image stabilization with a simple structure that minimizes the number of active elements to only two, and power consumption It is an object of the present invention to provide an actuator for a mobile terminal camera having a dual MSM device that enables real-time monitoring of the position and tilting angle of a lens barrel without a separate sensor, and a camera module for a mobile terminal having the same.

In order to achieve the above object, an actuator for a portable terminal camera according to the technical idea of the present invention comprises: a casing fixed to the portable terminal; a magnetic shape memory (MSM) device installed inside the casing to support a lens barrel on which a lens is mounted; and an inductor installed near the MSM element to stretch and deform the length of the MSM element while providing a magnetic field to the MSM element, wherein the lens barrel is displaced by extension and deformation of the MSM element. characteristic of the top.

Here, the MSM element is provided with a first MSM element and a second MSM element respectively supporting one point and another point spaced apart from each other with respect to the lens barrel, and provides a magnetic field by taking charge of the first MSM element and the second MSM element, respectively. It is provided with a first inductor and a second inductor that stretch and deform while doing so, and the forward and backward motion of the lens barrel, and the movement of the lens barrel by the combination of the amount of elastic deformation of the first MSM element and the amount of elastic deformation of the second MSM element in the initial state. A tilting operation in one direction and a tilting operation in the other direction are performed, and through this, autofocus and image stabilization functions of the camera are implemented.

In addition, the first MSM element and the second MSM element may be installed in the same front-rear direction at positions symmetrical to one side and the other with the lens barrel as a center.

In addition, the rear end of the first MSM element is fixed to the inner rear wall of the casing and the front end is tiltably coupled to the front end of one side of the lens barrel in a state in which the rear end faces the front, and the second MSM element has a rear end of the rear end of the casing after the inner side It is fixed to the face wall and the front end may be coupled to the other end of the lens barrel in a state in which it faces forward so as to be tiltable.

In addition, the lens barrel is controlled to advance by extension deformation of the first MSM element and the second MSM element in an initial state in which the lens barrel is not tilted forward or backward by the first MSM element and the second MSM element. , it may be characterized in that the lens barrel is controlled to retract by the reduction deformation of the first MSM element and the second MSM element in the initial state.

In addition, the first MSM element and the second MSM element control the lens barrel to tilt to one side by extension deformation of the second MSM element in an initial state in which the lens barrel is not tilted forward or backward or tilted to either side, It may be characterized in that the lens barrel is controlled to tilt to the other side by the stretching deformation of the first MSM.

In addition, the first MSM element and the second MSM element may be characterized in that the front and rear directions are oppositely installed at positions symmetrical to one side and the other with respect to the lens barrel.

In addition, the rear end of the first MSM element is fixed to the inner rear wall of the casing, and the front end is tiltably coupled to the lens barrel while facing forward, and the second MSM element has the rear end fixed to the inner front wall of the casing. and the front end portion may be characterized in that it is tiltably coupled to the lens barrel in a rearward-facing state.

In addition, in order to couple the first MSM element and the second MSM element to the lens barrel, a holder for supporting the lens barrel, a first pin coupled to a point of the holder in a state of being coupled to a front end of the first MSM element It may be characterized in that a second movable body pin-coupled to another point of the holder in a state of being coupled to the movable body and the tip of the second MSM element is further installed as an intermediate medium.

In addition, first and second springs are further installed to apply prestress in the direction in which the first and second MSM elements are contracted and deformed by contacting the front ends, which are free ends of the first and second MSM elements, respectively. can

In addition, the first MSM element and the second MSM element are installed at symmetrical positions on one side and the other side with respect to the lens barrel, and the first MSM element has the front first MSM element and the rear first MSM element on the front and rear sides. The second MSM device is provided in a form in which a front side 2MSM device and a rear side 2MSM device are coupled to face each other, and the first inductor is a front side first MSM device. The first inductor on the front side for handling the device and the first inductor on the back side for handling the first MSM device on the rear side are provided, wherein the second inductor includes a second inductor on the front side for handling the second MSM device on the front side; It may be characterized in that it is divided into a second inductor on the rear side that is responsible for the second MSM device on the rear side.

In addition, in order to couple the first MSM element and the second MSM element to the lens barrel, the holder for supporting the lens barrel, and the first MSM element on the front side and the first MSM element on the rear part of the holder in a coupled state. A first movable body pin-coupled to one point and a second movable body pin-coupled to another point of the holder in a state coupled between the front-side second MSM element and the rear-side second MSM element are further installed as an intermediate medium. can do.

In addition, in an initial state in which the lens barrel is not biased forward or backward or tilted to either side by the first MSM element on the front side, the first MSM element on the rear side, the second MSM element on the front side, and the second MSM element on the rear side. , the lens barrel is controlled to advance by the reduction deformation of the first MSM element in the front part and the extension deformation of the first MSM element in the rear part, the reduction deformation of the second MSM element in the front part, and the extension deformation of the second MSM element in the rear part; , In the initial state, the lens barrel is deformed by extension deformation of the first MSM element on the front side and reduction deformation of the first MSM element on the rear portion, extension deformation of the second MSM element on the front portion, and reduction deformation of the second MSM element on the rear portion in the initial state. It may be characterized in that it is controlled to retract.

Also, in an initial state in which the lens barrel is not tilted to either side by the front-side first MSM element, the rear-side first MSM element, the front-side second MSM element and the rear-side second MSM element, the front-side second MSM element The lens barrel is controlled to tilt to one side by the reduction deformation of the second MSM element in the rear part and the extension deformation of the second MSM element in the rear part, and the lens barrel is different by the reduction deformation of the first MSM element in the front part and the extension deformation of the first MSM element in the rear part. It may be characterized in that it is controlled to tilt to the side.

In addition, it may be characterized in that the length information of the stretched and deformed length is obtained by measuring the resistance values of the first MSM element and the second MSM element, and the current position and the tilting angle of the lens barrel are calculated without a separate sensor. have.

In addition, the material of the first MSM device and the second MSM device may be a single crystal ferrite Ni-Mn-Ga alloy or a Ni-Mn-X alloy (X=In, any one of Sn and Sb).

In addition, the material of the first MSM device and the second MSM device may be characterized in that it is a porous alloy.

In addition, the inductor may be a ferrite core inductor in which a coil is wound on a ferromagnetic core.

On the other hand, the camera module for a portable terminal according to the present invention, the actuator described above; a lens barrel displaced in a state supported by the actuator inside the casing; and an image sensor installed on the inner rear wall of the casing to correspond to the lens mounted on the lens barrel.

The actuator for a mobile terminal camera and the camera module for a mobile terminal having the same according to the present invention can perform both autofocus and optical image stabilization using only the first MSM element and the second MSM element, and can secure fast response characteristics and positioning accuracy.

In addition, according to the present invention, energy consumption in the auto focus and image stabilization regions can be reduced by 50% by using the holding force due to the shape memory effect of the first MSM element and the second MSM, so that power consumption can be minimized.

In addition, since the present invention can detect its own deformed state by the smart self-sensing function of the first MSM element and the second MSM element, the position and tilting angle of the lens barrel can be monitored in real time without a separate sensor. In this way, the weight of the camera module can be reduced, the configuration can be simplified, and the position control can be simplified to enable efficient movement.

It relates to an actuator for a mobile terminal camera having a dual MSM device and a camera module for a mobile terminal having the same.

1 is a cross-sectional view of an actuator for a mobile terminal camera and a camera module for a mobile terminal including the same according to an embodiment of the present invention;
2 is a reference modeling for the main part of an actuator for a camera of a portable terminal according to an embodiment of the present invention;
3 is a configuration diagram of a camera system including an actuator for a camera of a portable terminal according to an embodiment of the present invention;
4A to 4D are a series of reference views for explaining the action and operation of the actuator for a camera according to an embodiment of the present invention.
5 is a cross-sectional view of an actuator for a camera for a mobile terminal according to a first modified embodiment of the present invention and a camera module for a mobile terminal including the actuator;
6 is a cross-sectional view of an actuator for a camera for a mobile terminal according to a second modified embodiment of the present invention and a camera module for a mobile terminal including the actuator;
7 is a reference modeling for the main part of an actuator for a camera of a portable terminal according to a second modified embodiment of the present invention;

An actuator for a camera of a portable terminal according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements. In the accompanying drawings, the dimensions of the structures are enlarged than actual for clarity of the present invention, or shown reduced from reality in order to understand the schematic configuration.

Also, terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. Meanwhile, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

<Example>

1 is a cross-sectional view of an actuator for a mobile terminal camera according to an embodiment of the present invention and a camera module for a mobile terminal including the same, and FIG. 2 is a reference modeling for the main part of the actuator for a mobile terminal camera according to an embodiment of the present invention. 3 is a configuration diagram of a camera system including an actuator for a camera of a portable terminal according to an embodiment of the present invention.

As shown, the actuator for a camera according to an embodiment of the present invention includes a casing 110 , a holder 130 surrounding and supporting the barrel 120b, a first movable body 140a and a second movable body 140b, and the first It includes a spring 150a and a second spring 150b, a first MSM element 160a and a second MSM element 160b, and a first inductor 170a and a second inductor 170b. In the case of the present invention, autofocus and optical image stabilization functions can be performed very quickly only with a simple structure including two MSM (Magnetic Shape Memory) elements as active elements, and power consumption is minimized as well as , it is possible to monitor the position and tilting angle of the lens 120a or the lens barrel 120b in real time without an additional sensor.

Hereinafter, an actuator for a camera according to an embodiment of the present invention will be described in more detail focusing on each of the above components.

The casing 110 is fixed to the mobile terminal and includes a lens barrel 120b having a lens mounted therein, an image sensor 120c, a first MSM element 160a and a second MSM element 160b, a first movable body 140a, and A space is provided in which the second movable body 140b, the first spring 150a and the second spring 150b, and the first inductor 170a and the second inductor 170b are installed.

The first MSM element 160a and the second MSM element 160b serve to advance and tilt the barrel 120b while supporting the barrel 120b. To this end, the first MSM element 160a and the second MSM element 160b are connected to one side and the other side (left and right in the drawing) with the lens barrel 120b as the center inside the casing 110 as shown in FIG. 1 . In a symmetrical position, the front and rear directions are the same. Both the first MSM element 160a and the second MSM element 160b are tilted to one side and the other side of the lens barrel 120b in a state in which the rear end is fixed to the inner rear wall of the casing 110 and the front end faces the front as a free end. combined to be possible. The first MSM element 160a and the second MSM element 160b are active elements, and may be made of a single crystal ferrite Ni-Mn-Ga alloy consisting of five or seven layers, and a Ni-Mn-X alloy (provided that X=In, any one of Sn, Sb) or a Ni-Mn-based MSM alloy, or a porous MSM alloy or a polycrystalline MSM alloy. Each of the first MSM element 160a and the second MSM element 160b made of such a material can acquire information about the length deformed by measuring the resistance value. As such, the length of each of the first MSM element 160a and the second MSM element 160b It is possible to calculate the current position and the tilting angle of the lens barrel 120b from this calculation. As such, in the case of the actuator based on the first MSM element 160a and the second MSM element 160b, a plurality of sensors is not separately provided. Even if it is not, the position and the tilting angle according to the displacement state of the lens barrel 120b are grasped in real time, and precise control for automatic focus and hand shake compensation becomes possible.

The holder 130 and the first movable body 140a and the second movable body 140b are provided as an intermediate medium for coupling the first MSM device 160a and the second MSM device 160b to the lens barrel 120b. . The holder 130 is provided as a member that surrounds and supports most of the outside except for the front side corresponding to the lens barrel 120b, and may be shown as a member having the shape of a rectangular box or a cylindrical container with an open front as shown in the drawing. The first movable body 140a is coupled to the tip of one side of the holder 130 with a pin 141a in a state coupled to the tip of the first MSM device 160a, and the second movable body 140b is the second MSM device 160b. The other end of the holder 130 and the pin (141b) is coupled in a state coupled to the front end of the.

The first spring 150a and the second spring 150b are for applying a prestress in a direction in which the first MSM element 160a is reduced and deformed. While the movable body 140a and the second movable body 140b are elastically supported rearward, the first MSM element 160a and the second MSM element 160b are compressed toward the rear, in which the prestress is applied. When the first spring 150a and the second spring 150b are provided, the first movable body 140a and the second movable body 140b are very stable at the front ends of the first MSM device 160a and the second MSM device 160b. In addition to helping to maintain the coupled state, the first MSM element 160a and the second MSM element 160b provide prestress in a shrinking direction, thereby helping to more smoothly restore the original shape in the stretched deformed state.

The first inductor 170a and the second inductor 170b are installed near the first MSM element 160a and the second MSM element 160b, respectively, and serve to extend and deform the length of the MSM element while providing a magnetic field. Here, the first inductor 170a is provided as a ferrite core inductor in which a first coil 172 is wound on a first ferrite core 171 (ferromagnetic core), and the second inductor 170b is also a second ferrite core 173 . ) is provided as a ferrite core inductor in which the second coil 174 is wound on a ferromagnetic core.

According to the above configuration, when an initial current set in the first coil 172 and the second coil 174 is passed, the first MSM element 160a and the second MSM element 160b are not biased or inclined forward or backward, and are in an initial state. will keep In this initial state, when the amount of current is increased in the first coil 172 and the second coil 174 to additionally apply a magnetic field to the first MSM element 160a and the second MSM element 160b, the first MSM element 160a and As the second MSM element 160b is extended, the lens barrel 120b moves backward and forward in a straight forward form without tilting as shown in FIG. 4A . On the other hand, when the magnetic field is fully or partially recovered from the first MSM element 160a and the second MSM element 160b by reducing the amount of current in the first coil 172 in the initial state, the first MSM element 160a and the second MSM element ( 160b) is reduced, and the lens barrel 120b is retracted in a straight forward form without tilting as shown in FIG. 4B.

In addition, if the magnetic field is increased in the second MSM element 160b by increasing the amount of current to the second coil 174 in the initial state, the second MSM element 160b is extended and the lens barrel 120b is moved to one side as shown in FIG. 4C . (Left side in the drawing) It will tilt. Conversely, if the magnetic field is increased in the first MSM element 160a by increasing the amount of current applied to the first coil 172 in the initial state, the first MSM element 160a is elongated and the lens barrel 120b is moved to one side as shown in FIG. 4C . When tilting (the left side in the drawing) and increasing the amount of current to the first coil 172 to increase the magnetic field in the first MSM element 160a, the lens barrel 120b as shown in FIG. 4d as the first MSM element 160a is extended. It is tilted to the other side (left side in the drawing).

Here, for the tilting operation of the lens barrel 120b, rather than extending either one of the first MSM element 160a and the second MSM element 160b, the opposite element is reduced to maintain the overall balance during the tilting operation of the lens barrel 120b. can be advantageous.

If the forward/backward motion of the lens barrel 120b as shown in FIGS. 4A and 4B implements the autofocus function while changing the distance from the image sensor 120c, the tilting motion of the lens barrel 120b as shown in FIGS. 4C and 4D causes hand shake. It allows you to implement the correction function. In the case of such auto-focus and hand-shake correction, the controller 180 appropriately adjusts the amount of current flowing through the first coil 172 and the second coil 174 according to the auto-focus reference and the hand-shake reference.

In the case of the actuator for a portable terminal camera according to the embodiment of the present invention configured as described above, as shown in FIG. 1 , a lens barrel 120b to which a lens is mounted, and a casing corresponding to the lens mounted to the lens barrel 120b ( 110) including an image sensor 120c installed on the inner rear wall and constituting a camera module for a mobile terminal, as shown in FIG. 2, in addition to the actuator (A) for a mobile terminal camera according to the embodiment of the present invention, autofocus reference and a database (not shown) providing an image stabilization reference and the first MSM element 160a and the first MSM element 160a by adjusting the amount of current flowing through the first coil 172 and the second coil 174 according to the autofocus reference and the image stabilization reference. The controller 180 for controlling the expansion/contraction amount of the second MSM element 160b is included to configure the camera system. In the case of the controller 180 and the database, it is preferable to share the database with the controller 180 of the portable terminal.

On the other hand, the camera module for a portable terminal of the present invention can be variously modified by changing the arrangement of the MSM element. Hereinafter, such a modified embodiment will be described.

<First modified embodiment>

5 is a cross-sectional view of an actuator for a camera for a mobile terminal according to a first modified embodiment of the present invention and a camera module for a mobile terminal including the actuator.

As shown, in the actuator for a camera according to the first modified embodiment of the present invention, the first MSM element 160a and the second MSM element 160b are not installed in the same front-rear direction as compared to the previous embodiment, but different front and rear It is characterized by a configuration installed in the direction. That is, the first MSM element 160a and the second MSM element 160b are installed in a position symmetrical with respect to the lens barrel 120b inside the casing 110 in the opposite direction in the front-rear direction as shown in FIG. 5 . The first MSM element 160a has a rear end fixed to the inner rear wall of the casing 110 and a free end is tiltably coupled to one front end of the lens barrel 120b in a state in which it faces forward. The second MSM element 160b has a rear end fixed to the inner front wall of the casing 110 and a free end thereof is tiltably coupled to the rear end of the lens barrel 120b in a state in which it faces rearward. And the first movable body 140a is coupled to the tip of the first MSM device 160a with a pin 141a coupled to one tip of the holder 130, and the second movable body 140b is coupled to the second MSM device 160b. ) is coupled to the other rear end of the holder 130 in a state coupled to the front end of the pin (141b).

The first spring 150a is supported on the inner front wall of the casing 110 to apply prestress in a rearward direction in which the first MSM element 160a is contracted. In a state in which the second spring 150b is supported on the inner rear wall of the casing 110 , the pretest is applied toward the front in the direction in which the second MSM element 160b is reduced.

According to the configuration of the first modified embodiment as described above, when the initial current set in the first coil 172 and the second coil 174 flows, the first MSM element 160a and the second MSM element 160b are biased toward either side. It will maintain its initial state without tilting or tilting it. In this initial state, the amount of current is increased to the first coil 172 to additionally apply a magnetic field to the first MSM element 160a, and the amount of current is decreased to the second coil 174 to recover the magnetic field from the second MSM element 160b. Accordingly, while the first MSM element 160a is extended while the second MSM element 160b is contracted, the lens barrel 120b advances to the previous shape without tilting. On the other hand, in the initial state, the magnetic field is recovered from the first MSM element 160a by decreasing the amount of current in the first coil 172, and the amount of current is increased in the second coil 174 to additionally apply a magnetic field to the second MSM element 160b. When applied, the first MSM element 160a is reduced while the second MSM element 160b is extended, and the lens barrel 120b is retracted to the previous shape without tilting.

In addition, when the magnetic field is recovered from any one of the first MSM element 160a and the second MSM element 160b by reducing the amount of current in either the first coil 172 or the second coil 174 in the initial state as described above, As either the first MSM element 160a or the second MSM element 160b is reduced, the lens barrel 120b is tilted to one side (the left side in the drawing). On the other hand, if the magnetic field is increased in any one of the first MSM element 160a and the second MSM element 160b by increasing the amount of current to the first coil 172 or the second coil 174 in the initial state, the first MSM element ( As either one of 160a) and the second MSM element 160b is extended, the lens barrel 120b is tilted to the other side (the right side in the drawing).

Here, instead of reducing or increasing the amount of current in only one of the first coil 172 and the second coil 174, the amount of current is reduced or increased with respect to both the first coil 172 and the second coil 174. Thus, even if both the first MSM element 160a and the second MSM element 160b are reduced or extended, the lens barrel 120b is tilted, and in this case, it is more advantageous to improve the overall balance during the tilting operation.

<Second modified embodiment>

6 is a cross-sectional view of an actuator for a portable terminal camera according to a second modified embodiment of the present invention and a camera module for a portable terminal including the same, and FIG. 7 is an actuator for a portable terminal camera according to a second modified embodiment of the present invention. Modeling for reference on the main parts.

As shown, in the actuator for a camera according to the second modified embodiment of the present invention, compared to the previous embodiment, the active element MSM element is placed on the MSM element instead of two on one side and four on the other side with the barrel as the center. It is characterized in that the spring that applied the prestress to it is removed.

That is, the first MSM element and the second MSM element are installed in symmetrical positions on one side and the other side with respect to the lens barrel 120b, and the first MSM element includes the first MSM element 160a-1 on the front side and the first MSM element 160a-1 on the rear side. The first MSM device 160a-2 is provided in a form coupled to face each other on the front side and the rear side, and the second MSM device includes a front-side second MSM device 160b-1 and a rear-side second MSM device 160b-2. It is provided in a combined form facing each other from the front and rear sides. Accordingly, the first inductor includes the front first inductors 171a and 172a for handling the first MSM device 160a-1 on the front side and the first inductor on the rear side for the first MSM device 160a-2 on the rear side. (171b, 172b) are provided separately, and the second inductor includes the front side second inductors 173a and 174a for the front side second MSM device 160b-1, and the rear side second MSM device 160b-2. ) is provided by dividing the second inductors 173b and 174b on the rear side.

In addition, although the configuration of the holder 130 as an intermediate medium installed in the middle for coupling the first MSM element and the second MSM element to the lens barrel 120b is unchanged, in the case of the first movable body 141a, the front It is pin-coupled to one point of the holder 130 in a state coupled between the 1MSM element 160a-1 and the rear-side first MSM element 160a-2, and in the case of the second movable body 141b, the front-side second MSM element ( 160b-1) and the second MSM element 160b-2 on the rear side thereof are pin-coupled to other points of the holder 130 in a coupled state.

According to this second modified embodiment, in order for the lens barrel 120b to move forward based on the initial state, the reduction deformation of the front first MSM element 160a-1 and the rear first MSM element ( The extensional deformation of 160a-2) is performed, and the reduction deformation of the front-side second MSM element 160b-1 and the extensional deformation of the rear-side second MSM element 160b-2 are controlled at the same time. In order for the lens barrel 120b to retract, extension deformation of the first MSM element 160a-1 on the front side and reduction deformation of the first MSM element 160a-2 on the rear part are performed, and at the same time, the second MSM element 160b-1 on the front side part is retracted. ) is controlled to be stretched and deformed from the rear side of the second MSM element 160b - 2 to be reduced.

On the other hand, in order for the lens barrel 120b to be tilted to one side based on the initial state, the reduction deformation of the front-side second MSM element 160b-1 and the extension deformation of the rear-side second MSM element 160b-2 are controlled ( One side tilting of the front side first MSM element 160a-1 and the reduction deformation of the rear side first MSM element 160a-2 from one side opposite to the lens barrel 120b is also possible), the lens barrel 120b ) is controlled to be tilted to the other side (the other side located opposite to the lens barrel 120b) so that the reduction deformation of the front side first MSM element 160a-1 and the extension deformation of the rear side first MSM element 160a-2 are made. In addition, the other side tilting is possible even with the extension deformation of the front side 2MSM element 160b-1 and the reduction deformation of the rear side part 2MSM element 160b-2).

As an important point in the second modified embodiment of the present invention, in consideration of the space constraint of the casing 110, the forward/backward movement and tilting operation of the lens barrel 120b are performed without increasing the total length of the first MSM element or the second MSM element. should be done To this end, when either one of the front side MSM element and the rear side MSM element is stretched from one side and the other side, respectively, the other side is controlled to shrink by the same amount.

Although preferred embodiments of the present invention have been described above, various changes, modifications and equivalents may be used in the present invention. It is clear that the present invention can be equally applied by appropriately modifying the above embodiments. Accordingly, the above description is not intended to limit the scope of the present invention, which is defined by the limits of the following claims.

110: casing 120a: lens
120b: lens barrel 120c: image sensor
130: holder 140a: first movable body
140b: second moving body 150a: first spring
150b: second spring 160a: first MSM element
160b: second MSM element 170a: first inductor
170b: second inductor 171: first ferrite core
172: first coil 173: second ferrite core
174: second coil 180: controller

Claims (20)

In the actuator for a mobile terminal camera,
a casing fixed to the mobile terminal; a magnetic shape memory (MSM) device installed inside the casing to support a lens barrel on which a lens is mounted; and an inductor installed near the MSM device to stretch and deform the length of the MSM device while providing a magnetic field to the MSM device.
The lens barrel is displaced by stretching and deformation of the MSM element, wherein the MSM element is provided with a first MSM element and a second MSM element supporting one point and another point spaced apart from each other with respect to the lens barrel, respectively, and the first MSM element It is provided with a first inductor and a second inductor that respectively take charge of the element and the second MSM element and stretch and deform while providing a magnetic field,
By a combination of the amount of elastic deformation of the first MSM element and the amount of extension and contraction of the second MSM element in the initial state, the forward and backward motions of the lens barrel, one-way tilting of the lens barrel, and the other tilting operations are performed, and through this, the camera automatically Implements focus and image stabilization functions,
The first MSM element and the second MSM element are installed in the same front-rear direction at symmetrical positions on one side and the other side with respect to the lens barrel,
The first MSM element has a rear end fixed to the inner rear wall of the casing and is tiltably coupled to one front end of the lens barrel while the front end faces forward, and the second MSM element has a rear end on the inner rear wall of the casing. An actuator for a mobile terminal camera, characterized in that it is fixed and the front end portion is tiltably coupled to the other end portion of the lens barrel while facing forward. delete delete delete According to claim 1,
The lens barrel is controlled to advance by extension deformation of the first MSM element and the second MSM element in an initial state in which the lens barrel is not tilted forward or backward by the first MSM element and the second MSM element, and An actuator for a mobile terminal camera, characterized in that the lens barrel is controlled to retract by the reduction deformation of the first MSM element and the second MSM element in the initial state. 6. The method of claim 5,
The first MSM element and the second MSM element control the lens barrel to tilt to one side by extension deformation of the second MSM element in an initial state in which the lens barrel is not biased forward or backward or tilted to either side, and the first MSM element An actuator for a mobile terminal camera, characterized in that the lens barrel is controlled to tilt to the other side by the extension deformation of the. In the actuator for a mobile terminal camera,
a casing fixed to the mobile terminal; a magnetic shape memory (MSM) device installed inside the casing to support a lens barrel on which a lens is mounted; and an inductor installed near the MSM device to stretch and deform the length of the MSM device while providing a magnetic field to the MSM device.
The lens barrel is displaced by stretching and deformation of the MSM element, wherein the MSM element is provided with a first MSM element and a second MSM element supporting one point and another point spaced apart from each other with respect to the lens barrel, respectively, and the first MSM element It is provided with a first inductor and a second inductor that respectively take charge of the element and the second MSM element and stretch and deform while providing a magnetic field,
By a combination of the amount of elastic deformation of the first MSM element and the amount of extension and contraction of the second MSM element in the initial state, the forward and backward motions of the lens barrel, one-way tilting of the lens barrel, and the other tilting operations are performed, and through this, the camera automatically Implements focus and image stabilization functions,
The first MSM element and the second MSM element are symmetrical to one side and the other with the lens barrel as a center, and the front and rear directions are opposite to each other. 8. The method of claim 7,
The first MSM element has a rear end fixed to the inner rear wall of the casing, and a front end is tiltably coupled to the lens barrel while facing forward, and the second MSM element has a rear end fixed to the inner front wall of the casing, and a front end is an actuator for a portable terminal camera, characterized in that it is tiltably coupled to the lens barrel in a rearward state. In the actuator for a mobile terminal camera,
a casing fixed to the mobile terminal; a magnetic shape memory (MSM) device installed inside the casing to support a lens barrel on which a lens is mounted; and an inductor installed near the MSM device to stretch and deform the length of the MSM device while providing a magnetic field to the MSM device.
The lens barrel is displaced by stretching and deformation of the MSM element, wherein the MSM element is provided with a first MSM element and a second MSM element supporting one point and another point spaced apart from each other with respect to the lens barrel, respectively, and the first MSM element It is provided with a first inductor and a second inductor that respectively take charge of the device and the second MSM device and stretch and deform while providing a magnetic field,
By a combination of the amount of elastic deformation of the first MSM element and the amount of elastic deformation of the second MSM element in the initial state, the forward and backward motions of the lens barrel, one-way tilting and other-direction tilting of the lens barrel are performed. Implements focus and image stabilization functions,
For coupling of the first MSM element and the second MSM element to the lens barrel, a holder for supporting the lens barrel, a first movable body coupled to a tip of the first MSM element and pin-coupled to a point of the holder, and The actuator for a mobile terminal camera, characterized in that the second movable body is further installed as an intermediate medium, which is pin-coupled to another point of the holder in a state of being coupled to the front end of the second MSM element. 10. The method of claim 9,
A mobile terminal, characterized in that the first and second springs are further installed in contact with the free ends of the first and second MSM elements and apply prestress in the direction in which the first and second MSM elements are reduced and deformed. Actuator for camera. In the actuator for a mobile terminal camera,
a casing fixed to the mobile terminal; a magnetic shape memory (MSM) device installed inside the casing to support a lens barrel on which a lens is mounted; and an inductor installed near the MSM device to stretch and deform the length of the MSM device while providing a magnetic field to the MSM device.
The lens barrel is displaced by stretching and deformation of the MSM element, wherein the MSM element is provided with a first MSM element and a second MSM element supporting one point and another point spaced apart from each other with respect to the lens barrel, respectively, and the first MSM element It is provided with a first inductor and a second inductor that respectively take charge of the element and the second MSM element and stretch and deform while providing a magnetic field,
By a combination of the amount of elastic deformation of the first MSM element and the amount of extension and contraction of the second MSM element in the initial state, the forward and backward motions of the lens barrel, one-way tilting of the lens barrel, and the other tilting operations are performed, and through this, the camera automatically Implements focus and image stabilization functions,
The first MSM element and the second MSM element are installed at symmetrical positions on one side and the other side with respect to the lens barrel,
The first MSM device is provided in a form in which a front side first MSM device and a rear side first MSM device are coupled to face each other on the front and rear sides, and the second MSM device includes a front side second MSM device and a rear side second MSM device. It is provided in a combined form facing each other from the rear side,
The first inductor is divided into a front first inductor for handling the first MSM device on the front side and a first inductor on the back side for handling the first MSM device on the rear side, and the second inductor includes the second MSM device on the front side. An actuator for a portable terminal camera, characterized in that it is divided into a front side second inductor in charge and a rear side second inductor in charge of the second MSM element at the rear side. 12. The method of claim 11,
For coupling of the first MSM element and the second MSM element to the lens barrel, a holder for supporting the lens barrel, a point of the holder in a state coupled between the first MSM element in the front part and the first MSM element in the rear part A mobile device, characterized in that a first movable body pin-coupled to and a second movable body pin-coupled to another point of the holder in a state coupled between the front-side second MSM element and the rear-side second MSM element are further installed as an intermediate medium. Actuator for terminal camera. 13. The method of claim 12,
In an initial state in which the lens barrel is not biased forward or rearward or tilted to either side by the front first MSM element, the rear first MSM element, the front second MSM element, and the rear second MSM element, The lens barrel is controlled to advance by the reduction deformation of the first MSM element on the front part and the extension deformation of the first MSM element on the rear part, the reduction deformation of the second MSM element on the front part, and extension deformation of the second MSM element on the rear part; In the initial state, the lens barrel is retracted by the stretching deformation of the first MSM element on the front side and the reduction deformation of the first MSM element on the rear portion, the extension deformation of the second MSM element on the front side, and the reduction deformation of the second MSM element on the rear portion in the initial state. An actuator for a mobile terminal camera, characterized in that it is controlled. 14. The method of claim 13,
In an initial state in which the lens barrel is not tilted to either side by the front-side first MSM element, the rear-side first MSM element, the front-side second MSM element, and the rear-side second MSM element, the reduction of the front-side second MSM element The lens barrel is controlled to tilt to one side by deformation and extension deformation of the second MSM element in the rear part, and the lens barrel is tilted to the other side by the reduction deformation of the first MSM element in the front part and extension deformation of the first MSM element in the rear part An actuator for a mobile terminal camera, characterized in that it is controlled to do so. 12. The method of any one of claims 1, 7, 9 and 11,
The mobile terminal camera, characterized in that by acquiring the length information stretching and deforming by measuring the resistance values of the first MSM element and the second MSM element, and calculating the current position and the tilt angle of the lens barrel without a separate sensor through this for actuators. 12. The method of any one of claims 1, 7, 9 and 11,
The first MSM element and the second MSM element are made of a single crystal ferrite Ni-Mn-Ga alloy or a Ni-Mn-X alloy (X=In, Sn, and Sb). 17. The method of claim 16,
The actuator for a mobile terminal camera, characterized in that the material of the first MSM element and the second MSM element is a porous alloy. 12. The method of any one of claims 1, 7, 9 and 11,
The inductor is an actuator for a mobile terminal camera, characterized in that the ferrite core inductor is a coil wound on a ferrite core (Ferromagnetic Core). the actuator of any one of claims 1, 7, 9 and 11;
a lens barrel displaced in a state supported by the actuator inside the casing; and
and an image sensor installed on the inner rear wall of the casing to correspond to the lens mounted on the lens barrel. A mobile terminal, characterized in that the camera module of claim 19 is mounted.

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