WO2018135732A1 - Apparatus for driving reflector for ois by using wire - Google Patents

Abstract

An apparatus for driving a reflector for OIS by using a wire according to the present invention comprises: a support frame in which two or more shape memory alloy (SMA) wires are disposed at different positions; a reflector installed in the support frame and changing the path of light entering through an opening so as to allow the light to be incident to a lens; a base frame to which the SMA wires are coupled; an elastic body disposed between the support frame and the base frame so as to elastically support the support frame; and a circuit board for supplying current to the SMA wires.

Description

Reflector drive device for OIS using wire

The present invention relates to a reflector drive device, and more particularly, to a reflector drive device for an OIS that drives a reflectometer using a shape memory alloy wire to improve driving precision of image stabilization.

In accordance with the development of hardware technology and the change of user environment, various and complex functions are integrated in a mobile terminal (mobile terminal) such as a smart phone in addition to the basic functions for communication.

Typical examples are camera modules that implement functions such as auto focus (AF) and image stabilization (OIS) .In recent years, voice recognition, fingerprint recognition, and iris recognition functions for authentication or security are implemented. And the like are mounted on portable terminals, and in recent years, attempts have been made to mount a zoom lens in which a plurality of lens groups are assembled so that the focal length can be variably adjusted.

The zoom lens has a structure in which a plurality of lenses or lens groups are arranged in the optical axis direction, which is a direction in which light is introduced, unlike the general lens, and thus its length is longer in the optical axis length direction than the general lens. Light of the subject passing through the zoom lens is introduced into an image pickup device such as a charged-coupled device (CCD) and a complementary metal-oxide semiconductor (CMOS) like other lenses, and is then generated as image data through subsequent processing.

When the zoom lens is installed in a direction perpendicular to the main board of the portable terminal, that is, in a direction perpendicular to the main board like other general lenses, the portable terminal has a space equal to the height of the zoom lens (length in the optical axis direction). Since it should be, there is a problem that it is difficult to optimize the essential characteristics of the device miniaturization and weight reduction of the portable terminal.

Conventionally, in order to solve such a problem, there is a method of reducing the size of the optical system itself by adjusting the angle, size, spaced distance, focal length, etc., but this method is a method of physically reducing the size of the zoom lens or the zoom lens barrel. In addition to the inherent limitations, there is a problem in that the intrinsic characteristics of the zoom lens can be degraded.

On the other hand, the conventional image stabilization (OIS) method is a method for moving the lens or the lens module itself in two directions (X-axis, Y-axis direction) on a plane perpendicular to the optical axis direction (Z axis), this method When it is applied to the zoom lens as it is, there is a problem that the space utilization is low due to the shape, structure, function, etc. of the zoom lens, the volume of the device is increased and it is difficult to secure driving precision.

In order to solve such a problem, a method of mounting a reflector that refracts light to an actuator and moving the reflectometer about two axes parallel to the plane of the reflector has been attempted. In this case, a complex electromagnetic force driving means is reflected. Another problem is that the reflectometer and the surrounding structure are considerably complicated and their load increases because they have to be applied to the system itself.

The present invention has been made to solve the above-mentioned problems in the above-mentioned background, and coupled to the shape memory alloy wire having a characteristic that shrinks by application of current to the reflector or a support frame on which the reflector is mounted and the shape memory alloy wire It is an object of the present invention to provide an OIS reflectometer driving apparatus that can more easily and accurately implement driving of an OIS by changing a posture of a reflectometer or the like by using an operation characteristic of the.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, the objects and advantages of the present invention can be realized by the configuration shown in the claims and combinations thereof.

OIS reflector drive device using the wire of the present invention for achieving the above object is a shape memory alloy (SMA) wire is provided with two or more at different positions; A reflectometer installed in the support frame and changing the path of the light introduced through the opening to enter the lens; A base frame to which the SMA wire is coupled; An elastic body provided between the support frame and the base frame to elastically support the support frame; And it may be configured to include a circuit board for supplying a current to the SMA wire.

Preferably the SMA wire of the present invention may have a bent shape so that one end and the other end is located in the same direction, in this case, the support frame of the present invention includes a coupling portion to which the bent portion of the SMA wire is coupled Can be configured.

In addition, the SMA wire of the present invention is preferably configured to be provided in four positions corresponding to each other based on the vertical and horizontal directions.

In order to implement a more preferred embodiment of the present invention, the base frame and the support frame may further include a pivot support located in the center portion facing each other, in this case the pivot support of the present invention is formed in the shape of a sphere desirable.

In addition, the elastic body of the present invention may be provided in the center portion of the support frame and the base frame, in this case, the pivot support of the present invention may be provided in the hollow portion of the center of the elastic body.

OIS reflector driving apparatus using a wire according to another aspect of the present invention is provided with two or more SMA wire at different positions, the reflectometer for changing the path of the light introduced through the opening to enter the lens; A base frame to which the SMA wire is coupled; An elastic body provided between the counter clock and the base frame to elastically support the reflectometer; And it may include a circuit board for supplying a current to the SMA wire.

According to one embodiment of the present invention, the uniaxial driving or biaxial driving for the image stabilization is performed in the reflectometer, but the posture or position of the reflectometer is changed using the operating characteristics of the shape memory alloy wire. By configuring the device, it is possible to implement the device in a simpler structure as compared with the prior art, and to increase the space utilization of the device and thereby provide an effect of minimizing the size of the device.

According to another embodiment of the present invention, the reflectometer is configured to be physically supported by the pivot support and the elastic body, thereby creating an effect capable of more accurately and accurately inducing image stabilization according to the operating characteristics of the shape memory alloy wire. Can be.

In addition, the present invention can minimize or simplify the coupling structure between the parts or components to perform the assembly process more quickly and accurately can lower the defective rate and further improve the manufacturing efficiency.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, which serve to more effectively understand the technical spirit of the present invention, the present invention is described in these drawings. It should not be construed as limited to matters.

1 is a view showing the overall appearance of a drive device and an actuator to which the drive device is applied according to an embodiment of the present invention;

2 and 3 is an exploded coupling view showing a detailed configuration of a drive device according to an embodiment of the present invention,

4 is a view showing a detailed configuration of the support frame and the base frame according to an embodiment of the present invention,

5 is a view for explaining the operating relationship of the Y-axis OIS of the present invention implemented through the rotational movement of the reflectometer,

6 is a view for explaining the operating relationship of the X-axis OIS of the present invention implemented through the rotational movement of the reflectometer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be water and variations.

1 is a view showing the overall appearance of an OIS reflector drive device 100 (hereinafter referred to as a 'drive device') and an actuator 1000 to which the drive device is applied using a wire of a preferred embodiment of the present invention. .

The driving device 100 of the present invention may be implemented as a single device, as well as a lens driving module including a unit for performing axial driving of either the AF driving or the OIS driving of the lens (zoom lens) 210. It may be implemented as a part of one actuator 1000 in a form coupled to the upper portion of the 200.

According to an exemplary embodiment, the driving device 100 of the present invention may perform OIS driving in two directions (X-axis and Y-axis) perpendicular to the optical axis. In this case, the lens driving module 200 performs only AF driving. It can also be configured.

The lens 210 may be not only a single lens, but also a plurality of lenses, a lens group, or a zoom lens in which an optical member such as a prism and a mirror may be included therein. When the lens 210 is formed of a zoom lens or a zoom lens barrel, the lens 210 may have a shape extending in the vertical length direction (Z-axis direction).

According to the present invention, the light path of the subject is not directly introduced into the lens 210, but the light path is changed through the reflectometer (120 of FIG. 2) provided in the driving device 100 of the present invention (refraction, reflection). Etc.) and then flows into the lens 210. In FIG. 1, the path of light coming from the outer world is Z1, and the path of light entering Z1 is reflected or reflected by the reflectometer 120. In the following description, Z is referred to as the optical axis to the optical axis direction.

In addition, although not shown in the drawing, an image pickup device, such as a CCD or a CMOS, may be provided below the lens 210 based on the optical axis direction to convert the light signal into an electrical signal. The filter may be provided together.

As described below, the present invention avoids the conventional OIS method of moving the lens itself in two directions perpendicular to the optical axis Z, that is, in the X-axis direction (first direction) and Y-axis direction (second direction). And an OIS for at least one of the first direction and the second direction to be implemented in the reflectometer 120 for changing the path of light.

As shown in FIG. 1, the driving apparatus 100 may additionally include a lens mounting space 10. In this space 10, a lens having an optical characteristic different from that of the zoom lens 210 may be mounted. According to the exemplary embodiment, the lens mounting space 10 may be implemented without a shape.

2 and 3 are exploded coupling diagram showing the detailed configuration of the drive device 100 according to an embodiment of the present invention.

As shown in FIGS. 2 and 3, the driving device 100 of the present invention includes a support frame 110, a reflectometer 120, a base frame 130, an elastic body 140, a circuit board 150, and an opening. It may be configured to include a housing 160, a shape memory alloy (SMA) wire 170 and the pivot support 180 is provided with (161).

As described above, the axis corresponding to the vertical axis direction of the lens 210, that is, the path through which light enters the lens 210, is defined as an optical axis (Z axis), and two axes on a plane perpendicular to the optical axis (Z axis) are X. It is defined by axis and Y axis.

As shown in FIG. 2, when light is introduced into the driving device 100 of the present invention through the opening 161 of the housing 160, the reflectometer 120 of the present invention receives the path of the incoming light. The light is introduced into the lens 210 by changing the direction Z (refraction or reflection).

The reflectometer 120 may be one selected from a mirror or a prism, or a combination thereof, and may be implemented as various members that may change light introduced from the outside into the optical axis direction.

As described above, the present invention is configured such that the light of the subject is introduced into the lens 210 after the path is refracted by the reflectometer 120, so that the lens 210 itself does not need to be installed in the thickness direction of the mobile terminal. Therefore, even when the zoom lens is mounted on the portable terminal, the thickness of the portable terminal may not be increased, thereby minimizing the size of the portable terminal.

The support frame 110 of the present invention is a configuration in which the reflectometer 120 is installed, the shape memory alloy (SMA) wire 170 is provided.

As will be described later, if the position or posture of the support frame 110 is changed by the driving characteristics of the SMA wire 170, the position or posture of the reflectometer 120 installed in the support frame 110 is changed and accordingly the lens ( The path of the light flowing into the side 210 is changed or corrected to implement driving of the OIS.

Base frame 130 of the present invention is a configuration that the SMA wire 170 is coupled, the elastic body 140 is connected to the support frame 110. Through this configuration, the base frame 130 of the present invention elastically supports the reflector 120 mounted on the support frame 110, that is, the support frame 110, and physically according to shrinkage, extension, etc. of the SMA wire 170. The change is transmitted to the support frame 110.

The circuit board 150 of the present invention is electrically connected to an end portion of the SMA wire 170 described above and performs a function of supplying current to the SMA wire 170.

The shape memory alloy wire 170 is configured to change the posture or the position of the support frame 110 with respect to the base frame 130. The length of the shape memory alloy wire contracts due to a thermal change generated when an appropriate size current is applied. Corresponds to the wire with characteristics.

SMA wire 170 may be a titanium-nickel alloy or a copper-zinc-aluminum alloy (20 to 25% zinc, 4 to 6% aluminum) and the like composed of titanium and nickel in a 1: 1 ratio.

In order to more precisely control the movement of the support frame 110 by contraction of the SMA wire 170, the elastic body 140 is partially contracted (compressed) to an appropriate size, and the support frame 110 and the base frame ( 130).

In this state, when the current is applied to the SMA wire 170, the contraction with the force exceeding the elastic force of the elastic body 140 to pull the support frame 110, and when the supply of the applied current is interrupted to the restoring force of the elastic body 140 As a result, the support frame 110 is more easily restored to its original position.

Since the SMA wire 170 has a characteristic of shrinking when a current is applied and restoring to its original length when the current supply is interrupted, when the SMA wire 170 is installed on only one side of the support frame 110 in a negative (-) direction or The support frame 110 moves in only one of the positive (+) directions.

Therefore, in order to implement OIS driving for both negative and bidirectional directions, the SMA wires 170 may be provided in two or more different positions, but the opposite directions may be positioned relative to the center of the support frame 110. Do.

The circuit board 150 supplies current to the SMA wire 170 through the coupling hole 151. The circuit board 150 has the same end as the other end of the SMA wire 170 in order to more effectively implement the current application and the closed circuit configuration. It is preferable to configure to be located in the direction.

To this end, the SMA wire 170 of the present invention is preferably configured to have a bent shape in the center, the support frame 110, the coupling portion 111 is coupled to the bent portion of the SMA wire 170 4) is preferably provided.

On the other hand, the Hall sensor 155 provided at a position corresponding to the sensing magnet 115 provided in the support frame 110 is a position of the sensing magnet 115 using a hall effect, that is, a reflectometer The position of the sensor 120 is sensed, and a driver driver (not shown) uses the sensed position value to feedback control the appropriate current to be applied to the SMA wire 170, so that shaking of the hand shake is corrected.

The hall sensor 155 and the sensing magnet 115 are configured to sense the position of the reflectometer 120, and include a sensor for sensing a position using a light signal according to an embodiment of the reflectometer 120. Of course, various types of sensors that can sense the position can replace the Hall sensor.

In addition, the support frame 110 or the housing 160 is further provided with stoppers 113 and 163 to guide or restrict the movement of the support frame 110 by the contraction, extension, etc. of the SMA wire 170. desirable.

As shown in FIG. 3, the elastic body 140 of the present invention is provided at the center portion of the support frame 110 and the base frame 130 facing each other, and may be implemented as a single spring such as a spiral shape. It can also be implemented in multiple ways with Spring.

As shown in FIG. 3, the present invention may further include a pivot support 180 positioned at a center portion of the base frame 130 and the support frame 110 facing each other.

The pivot support 180 is configured to provide a reference position at which the attitude of the support frame 110 is changed with respect to the base frame 130, and the pivot support 180 includes the support frame 110. The posture can be induced to be changed by contraction and extension of the SMA wire 170 while maintaining a state in which the SMA wire 170 is in contact with each other.

The hole 132 that constrains the movement of the pivot support 180 may include a base frame 130 or a support frame (eg, a shape in which a portion of the pivot support 180 is accommodated so that the pivot support 180 does not escape to the outside). It is preferably provided to 110).

The pivot support 180 may be implemented in various shapes such as a pillar shape and a horn shape, but may be implemented in the shape of a ball to provide a minimum frictional force by point-contact and rolling itself. Most preferred.

As shown in FIG. 3 and the like, the base frame 130 elastically supports the support frame 110 as well as to improve the efficiency of posture or position control of the support frame 110. And the center frame 130 of the base frame 130, the pivot support 180 is preferably configured to be provided in the hollow portion of the elastic body 140.

Although the embodiment of the present invention described above has been described based on the form in which the reflectometer 120 is mounted or installed on the support frame 110, the reflectometer 120 may form a shape freely by injection, etc. The configuration and shape necessary for itself is realized, so that the reflectometer 120 itself is elastically supported by the base frame 130 and the SMA wire 170 is connected to the reflectometer 120 itself to configure the reflectometer ( 120) It is a matter of course that the embodiment that controls itself or the position itself is possible.

4 is a diagram illustrating a detailed configuration of the support frame 110 and the base frame 130 according to an embodiment of the present invention.

As described above, it is preferable that two or more SMA wires 170 are provided. In order to improve the precision and accuracy of X-axis and Y-axis driving, as shown in FIG. It is preferable to be implemented in four (170-1a, 170-1b, 170-2a, 170-2b) in the position corresponding to each other.

These four SMA wires 170 are all connected by the support frame 110 and the coupling portion 111, etc., the support frame 110 is elastically supported by the elastic body 140 and at the same time implemented in the shape of a ball (ball) The pivot point 180 is supported by the reference point of the posture change.

As such, when the SMA wire 170 is implemented as four (170-1a, 170-1b, 170-2a, 170-2b) at positions corresponding or symmetrical with respect to the horizontal and vertical directions, the SMA wire is applied with current. Combination selection of 170 enables more precise implementation of OIS driving in the X- and Y-axis directions.

As shown in FIG. 4, the base frame 130 of the present invention includes one or more wire coupling portions 131, and a portion of the SMA wire 170 may be coupled by the wire coupling portions 131. have.

Hereinafter, the operation relationship of driving the OIS in the Y-axis and X-axis directions through the change of attitude of the reflectometer 120 will be described with reference to FIGS. 5 and 6.

5 is a view for explaining the operating relationship of the Y-axis OIS of the present invention implemented through the rotational movement of the reflectometer.

Since the light of the subject existing in the external world is reflected through the reflectometer 120 and introduced into the image pickup device through the lens, the path of the light flowing into the image pickup device varies according to the posture or angle of the reflectometer. As illustrated in FIG. 5B, when no current is applied to the SMA wire 170, the light signal flows to a predetermined reference position.

When current is applied to the SMA wires 170-1a and 170-2a of the SMA wires 170, the SMA wires 170-1a and 170-2a are contracted by a length that is functionally proportional to the magnitude of the applied current. The posture or position of the support frame 110, that is, the reflectometer 120 is changed in a direction corresponding to a clockwise direction (see FIG. 5) by the contraction.

When the position or posture of the reflectometer 120 is changed in the clockwise direction as described above, the incoming light generates a shift d1 to the left as shown in FIG. Correction in the negative (-) direction of the axis (left of Fig. 5) is performed.

In a corresponding aspect, when current is applied to the SMA wires 170-1b and 170-2b of the SMA wires 170 and no current is supplied to the SMA wires 170-1a and 170-2a, the SMA wires 170-1b. , 170-2b), so that the posture or position of the support frame 110, that is, the reflectometer 120, is anticlockwise (based on FIG. 5) based on the pivot support 180.

In this way, when the position or posture of the reflectometer 120 changes in the counterclockwise direction, the incoming light generates a shift d2 to the right as shown in FIG. 5 (c). Correction in the negative (+) direction of the Y axis (right direction in Fig. 5) is performed.

6 is a view for explaining the operating relationship of the X-axis OIS of the present invention implemented through the rotational movement of the reflectometer.

As shown in FIG. 5 (b), when no current is applied to any of the wires of the SMA wire 170, light is introduced into a predetermined reference position (FIG. 6 (b)), and the hall sensor 155 is shaken in the X-axis direction. When the signal is output to the driver (not shown), the driver selects the SMA wire 170 corresponding to the signal among the SMA wires 170 and a current having an appropriate magnitude is applied to the selected SMA wires 170. Control as possible.

When current is applied only to the SMA wires 170-1a and 170-1b of the SMA wire 170 as shown in FIG. 6A, the SMA wires 170-1a and 170-1b are functional to the magnitude of the applied current. The contraction is proportional to the length, and by this contraction, the support frame 110, that is, the reflectometer 120, changes its posture or position in a direction corresponding to the clockwise direction (see FIG. 6).

As described above, when the position or posture of the reflectometer 120 changes clockwise, the incoming light generates a shift d1 to the left as shown in FIG. 6 (a). Correction in the negative (-) direction of the X axis (the left direction of FIG. 6) is performed.

6 (c), the current is applied only to the SMA wires 170-2a and 170-2b and the other SMA wires 170-1a and 170-1b are not applied as shown in FIG. 6 (c). Otherwise, the SMA wires 170-2a and 170-2b to which the current is applied are contracted by a length that is functionally proportional to the magnitude of the applied current, and by this contraction, the support frame 110, that is, the reflectometer 120 Its posture or position changes in a direction corresponding to the counterclockwise direction (see FIG. 6).

As described above, when the position or posture of the reflectometer 120 changes counterclockwise, the incoming light generates a shift d2 to the right as shown in FIG. In the X-axis positive (+) direction correction (right direction relative to Figure 6) is made.

5 and 6 are only diagrams independently explaining the Y-axis direction correction movement and the X-axis direction correction movement, respectively, to explain the basic operation relationship of the present invention, the actual OIS drive using the wire according to the present invention, each axis direction Of course, it is implemented to adaptively respond to the actual shaking by applying a combination of driving by.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

The accompanying drawings for the purpose of describing the present invention and the embodiments thereof may be shown in somewhat exaggerated form in order to emphasize or highlight the technical contents of the present invention. It should be understood that various forms of modification application may be possible at the level of ordinary skill in the art in consideration.

Claims (8)

A support frame having two or more shape memory alloy wires at different positions; A reflectometer installed in the support frame and changing the path of the light introduced through the opening to enter the lens; A base frame to which the SMA wire is coupled; An elastic body provided between the support frame and the base frame to elastically support the support frame; And Reflector drive device for OIS using a wire, characterized in that it comprises a circuit board for supplying current to the SMA wire. The method of claim 1, wherein the SMA wire, Reflective drive device for OIS using a wire, characterized in that the one end and the other end is bent in the same direction. The method of claim 2, wherein the support frame, Reflector drive device for OIS using a wire, characterized in that it comprises a coupling portion to which the bent portion of the SMA wire is coupled. The method of claim 1, wherein the SMA wire, Reflective drive device for OIS using a wire, characterized in that provided in four corresponding positions on the basis of the vertical and horizontal direction. The method of claim 1, Reflector drive device for OIS using a wire further comprises a pivot support positioned in the center portion of the base frame and the support frame facing each other. The method of claim 5, wherein the pivot support, Reflective drive device for OIS using a wire characterized by having a sphere shape. The method of claim 5, wherein the elastic body, It is provided in the center portion of the support frame and the base frame, The pivot support is an OIS reflector drive device using a wire, characterized in that provided in the hollow portion of the elastic body. Two or more shape memory alloy (SMA) wire is provided in different positions, the reflectometer for changing the path of the light introduced through the opening to enter the lens; A base frame to which the SMA wire is coupled; An elastic body provided between the counter clock and the base frame to elastically support the reflectometer; And Reflector drive device for OIS using a wire, characterized in that it comprises a circuit board for supplying current to the SMA wire.

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