KR20180086762A - Apparatus for driving optical-reflector for ois with sma wire - Google Patents

Abstract

The present invention relates to an OIS reflectometer driving apparatus using a wire. The OIS reflectometer driving apparatus using a wire comprises: a support frame in which at least two shape memory alloy (SMA) wires are provided in different positions; a reflectometer installed in the support frame and changing a path of light introduced through an opening to introduce the light into a 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 a circuit board supplying a current to the SMA wire.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an OIS reflector,

The present invention relates to a reflection-type driving apparatus, and more particularly, to a reflection-type driving apparatus for an OIS which improves driving precision of camera-shake correction by driving a reflection system using a shape memory alloy wire.

According to the development of hardware technology, user environment, etc., various and complex functions other than basic functions for communication are integrated in a portable terminal (mobile terminal) such as a smart phone.

Typical examples are camera modules implemented with functions such as autofocus (AF), optical image stabilization (OIS), and the like. In recent years, voice recognition, fingerprint recognition, iris recognition And the like are also mounted on portable terminals. Recently, mounting of a zoom lens in which a plurality of lens groups are assembled is also attempted so that the focal length can be variably adjusted in various ways.

Unlike a general lens, a zoom lens has a structure in which a plurality of lenses or lens groups are arranged in a direction of an optical axis, in which light is introduced, and thus has a longer length in the optical axis direction than a general lens. Light of a subject passing through the zoom lens is introduced into an image pickup device such as a CCD (Charge-coupled Device) or CMOS (Complementary Metal-Oxide Semiconductor) 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, that is, in a direction perpendicular to the main board of the portable terminal, such as another general lens, the portable terminal is provided with a space corresponding to the height of the zoom lens There is a problem that it is difficult to optimize the essential features of the compact and lightweight device that the portable terminal is aimed at.

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 distance, and the like of the lens, but this method is a method of physically reducing the size of the zoom lens or zoom lens barrel There is an inherent limitation, and there is a problem that the intrinsic characteristics of the zoom lens can be deteriorated.

Meanwhile, a commonly used OIS method is a method of correcting and moving the lens or the lens module itself in two directions (X-axis and Y-axis directions) on a plane perpendicular to the optical axis direction (Z-axis) When the zoom lens is directly applied to the zoom lens, the space utilization is low due to the shape, structure and function of the zoom lens, the volume of the device is increased, and the driving precision is difficult to secure.

In order to solve such a problem, there has been attempted a method of mounting a reflection system for refracting light on an actuator and moving the reflection system on the basis of two axes parallel to the plane of the reflection system. In this method, The reflector and the surrounding structure are considerably complicated and the self-load is increased.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a shape memory alloy wire having a characteristic of shrinking by current application to a support frame, The present invention provides an OIS reflector driving apparatus that can more simply and accurately implement driving of an OIS by changing the posture of a reflecting system or the like using the operating characteristics of the OIS.

Other objects and advantages of the present invention will become apparent from the following description, and it will be apparent from the description of the embodiments of the present invention. Further, the objects and advantages of the present invention can be realized by a combination of the constitution shown in the claims and the constitution thereof.

According to an aspect of the present invention, there is provided a reflective-system driving apparatus for an OIS using a wire, including: a support frame having shape memory alloy (SMA) wires provided at two or more different positions; A reflector installed in the support frame and changing the path of the light introduced through the opening and introducing the light into 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 a circuit board for supplying 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 of the SMA wire are 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 Lt; / RTI >

In addition, it is preferable that the SMA wires of the present invention are provided in four positions corresponding to each other with reference to the vertical and horizontal directions.

In order to realize a more preferable embodiment of the present invention, the present invention may further include a pivot support positioned at a central portion of the base frame and the support frame facing each other. In this case, the pivot support of the present invention may have a spherical shape desirable.

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

According to another aspect of the present invention, there is provided a reflection system driving apparatus for an OIS using wires, comprising: a reflection system having at least two SMA wires disposed at different positions and changing a path of light introduced through the opening; A base frame to which the SMA wire is coupled; An elastic body provided between the counterclockwise and the base frame to elastically support the reflection system; And a circuit board for supplying current to the SMA wire.

According to an embodiment of the present invention, it is preferable that the uniaxial direction driving or the double-axis direction driving for correction of camera-shake is made in the reflection system, and the operation state of the shape memory alloy wire is used to change the attitude or position of the reflection system It is possible to realize an apparatus with a simpler structure as compared with the prior art, and further, the space utilization of the apparatus can be further improved and the size of the apparatus can be minimized.

According to another embodiment of the present invention, by constructing the reflection system to be physically supported by the pivot support and the elastic body, it is possible to more accurately and accurately induce the camera shake correction according to the operation characteristics of the shape memory alloy wire .

In addition, the present invention minimizes or simplifies the coupling structure between parts and components, thereby making it possible to perform the assembly process more quickly and accurately, thereby reducing the defect rate and further improving the manufacturing efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the detailed description of the invention given below, serve to better understand the technical idea of the invention, And shall not be construed as limited to such matters.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a driving apparatus according to a preferred embodiment of the present invention and an overall view of an actuator to which the driving apparatus is applied;
FIG. 2 and FIG. 3 are exploded views showing a detailed structure of a driving apparatus according to a preferred embodiment of the present invention,
4 is a view showing a detailed configuration of a support frame and a base frame according to an embodiment of the present invention,
FIG. 5 is a view for explaining the operation of the Y-axis OIS of the present invention implemented through rotational movement of a reflectometer,
6 is a view for explaining the operating relationship of the X-axis OIS of the present invention realized through rotational movement of the reflection system.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

FIG. 1 is a diagram showing an overall view of an OIS reflector driving apparatus 100 (hereinafter referred to as 'driving apparatus') using a wire according to a preferred embodiment of the present invention and an actuator 1000 to which the driving apparatus is applied .

The driving apparatus 100 of the present invention may be implemented as a single unit, and may be a lens driving module including a unit that performs one of axial driving of the AF driving or the OIS driving with respect to the lens (zoom lens) Or may be implemented as a portion of one actuator 1000 in a form coupled to an upper portion of the actuator 200 or the like.

According to the embodiment, the driving apparatus 100 of the present invention can 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 .

The lens 210 may be a single lens, as well as a plurality of lens or lens groups, or a zoom lens in which an optical member such as a prism, a mirror, or the like may be included therein. When the lens 210 is composed of a zoom lens or a zoom lens barrel, the lens 210 may extend in the vertical direction (Z-axis direction).

The light path of the object is changed (refraction, reflection, etc.) through the reflection system (120 in FIG. 2) provided in the driving apparatus 100 of the present invention without the light of the object being directly introduced into the lens 210, Or the like), and is then introduced into the lens 210. 1, the path of the light coming from the outside world is Z1, and the path of the light that is refracted or reflected by the reflection system 120 and enters the lens 210 is Z. FIG. In the following description, Z is referred to as an optical axis or optical axis direction.

Although not shown in the figure, an imaging device such as a CCD or a CMOS that converts a light signal into an electric signal may be provided below the lens 210 with respect to an optical axis direction, and may block or transmit a light signal of a specific band A filter may be provided together.

As will be described below, the present invention avoids the conventional OIS method of moving the lens itself in two directions perpendicular to the optical axis Z, namely, the X axis direction (first direction) and the Y axis direction (second direction) And the OIS for one or more of the first direction or the second direction is implemented in a reflectometer 120 that alters the path of light.

As shown in FIG. 1, the driving apparatus 100 may further include a lens mounting space 10, and a lens having optical characteristics different from those of the zoom lens 210 may be mounted on the space 10. But it is needless to say that the lens mounting space 10 may not be provided according to the embodiment.

FIGS. 2 and 3 are exploded coupling views showing the detailed structure of the driving apparatus 100 according to a preferred embodiment of the present invention.

2 and 3, the driving apparatus 100 of the present invention includes a supporting frame 110, a reflector 120, a base frame 130, an elastic body 140, a circuit board 150, A shape memory alloy (SMA) wire 170, and a pivot support 180. The housing 160 may be formed of a metal such as aluminum,

As described above, the axis corresponding to the vertical axis direction of the lens 210, that is, the path corresponding to the light entering the lens 210 is defined as an optical axis (Z axis), and two axes on a plane perpendicular to the optical axis (Z axis) Axis and Y-axis.

2, when the light is introduced into the driving apparatus 100 of the present invention through the opening 161 of the housing 160, the reflecting system 120 of the present invention changes the path of the introduced light to the optical axis (Refracted, reflected, or the like) to the direction Z to introduce light into the lens 210 side.

The reflector 120 may be a mirror or a prism, or a combination thereof. The reflector 120 may be implemented by various members capable of changing the light incident from the outside world in the optical axis direction.

As described above, according to the present invention, the light of the subject is refracted by the reflectometer 120 and then introduced into the lens 210, so that the lens 210 itself is not installed in the thickness direction of the portable terminal Therefore, even if the zoom lens is mounted on the portable terminal, the thickness of the portable terminal is not increased and the portable terminal can be optimized for miniaturization and the like.

The support frame 110 of the present invention is provided with the reflectometer 120 and is provided with a shape memory alloy (SMA) wire 170.

When the position or attitude of the support frame 110 is changed by the driving characteristic of the SMA wire 170 as described later, the position or attitude of the reflector 120 provided on the support frame 110 is changed, 210 is changed or corrected so that the driving of the OIS is realized.

The base frame 130 of the present invention is configured such that the SMA wire 170 is coupled to the support frame 110 via the elastic body 140. The base frame 130 of the present invention elastically supports the support frame 110, that is, the reflector 120 mounted on the support frame 110, and supports the SMA wire 170 in a physical And transfers the change to the support frame 110.

The circuit board 150 of the present invention is electrically connected to the end portion of the SMA wire 170 and the like to supply current to the SMA wire 170.

The shape memory alloy wire 170 is configured to change the posture or position of the support frame 110 with respect to the base frame 130. The length of the shape memory alloy wire 170 contracts due to a thermal change generated when an appropriate- Which corresponds to a wire having a characteristic.

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

The elastic body 140 may be integrally formed with the support frame 110 and the base frame 110 in a state of being appropriately contracted (compressed) in order to more precisely control the movement of the support frame 110 by shrinkage of the SMA wire 170, 130).

When the current is applied to the SMA wire 170 in this state, the elastic member 140 is contracted by a force exceeding the elastic force of the elastic member 140 to pull the support frame 110. When supply of the applied current is stopped, The support frame 110 is more easily restored to its original position.

Since the SMA wire 170 has the characteristic of being restored to its original length when the current is supplied and the current is interrupted, when the SMA wire 170 is installed only on one side of the support frame 110, The supporting frame 110 moves only in one of the positive and negative directions.

Therefore, in order to realize the OIS driving for both the negative direction and the both directions, it is preferable that the SMA wires 170 are provided at two or more different positions, but are positioned opposite to each other with respect to the center portion of the support frame 110 Do.

The circuit board 150 supplies a current to the SMA wire 170 through the coupling hole 151. In order to more effectively implement the current application and the closed circuit configuration, the SMA wire 170 has one end and the other end of the same Direction.

For this, the SMA wire 170 of the present invention is preferably configured such that the middle portion thereof has a bent shape, and the support frame 110 is provided with a coupling portion 111, to which the bent portion of the SMA wire 170 is coupled 4 are preferably provided.

The hall sensor 155 provided at the position corresponding to the sensing magnet 115 provided on the support frame 110 is positioned at a position of the sensing magnet 115 using a Hall effect, The driving driver (not shown) senses the position of the SMA wire 120 and performs feedback control so that an appropriate current is applied to the SMA wire 170 using the sensed position value, thereby correcting the shaking motion.

The hole sensor 155 and the sensing magnet 115 are provided to sense the position of the reflection system 120 and include a sensor for sensing the position of the reflection system 120 using a light signal according to the embodiment, It goes without saying that various types of sensors capable of sensing the position can be substituted for the hole sensors.

The stopper 113 or 163 is further provided on the support frame 110 or the housing 160 so that the movement of the support frame 110 can be guided or restricted by the contraction or extension of the SMA wire 170 desirable.

3, the elastic body 140 of the present invention may be formed as a single spring such as a spiral or the like, provided at a center portion where the support frame 110 and the base frame 130 face each other, It can also be implemented as a spring.

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 as shown in FIG.

The pivot support 180 is configured to provide a reference position in which the posture of the support frame 110 is changed with respect to the base frame 130. The pivot support 180 is configured such that the support frame 110 supports the pivot support 180, It is possible to induce the SMA wire 170 to change its posture by contraction and extension of the SMA wire 170 while maintaining the state of being in contact with the support frame 110, thereby realizing more precise posture and position control of the support frame 110.

A hole 132 for restricting the movement of the pivot support 180 includes a shape in which a portion of the pivot support 180 is received so that the pivot support 180 is not released to the outside, 110).

The pivot support 180 may be implemented in various shapes, such as a columnar shape or a horn shape, but may be implemented in the form of a ball to provide a minimum frictional force by point-contact and rolling Is most preferable.

The elastic body 140 is fixed to the support frame 110 as shown in Figure 3 or the like so that the base frame 130 elastically supports the support frame 110 as well as the efficiency of posture and position control of the support frame 110. [ And the pivot support 180 may be provided in the middle hollow portion of the elastic body 140. The pivot support 180 may be provided in the middle portion of the base frame 130,

Although the embodiment of the present invention described above has been described on the basis of the form in which the reflector 120 is mounted or installed on the support frame 110, the reflector can be freely formed by injection or the like, So that the reflector 120 itself is elastically supported by the base frame 130 and the SMA wire 170 is connected to the reflector 120 itself, 120 may be controlled by itself.

4 is a view showing 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 precision and accuracy of X-axis and Y-axis driving, as shown in FIG. 4, (170-1a, 170-1b, 170-2a, 170-2b) at positions corresponding to each other.

The four SMA wires 170 are connected to each other by the support frame 110 and the coupling part 111. The support frame 110 is elastically supported by the elastic body 140 and is formed into a ball shape The reference point of the posture change is supported by the pivot support 180. [

When the SMA wire 170 is implemented as four (170-1a, 170-1b, 170-2a, and 170-2b) in positions corresponding or symmetric with respect to the horizontal and vertical directions, the SMA wire The OIS driving in the X-axis direction and the Y-axis direction can be more precisely implemented through a combination of the selection of the X-axis direction and the Y-axis direction.

4, the base frame 130 of the present invention is provided with at least one wire coupling part 131, and a part of the SMA wire 170 may be configured to be coupled by the wire coupling part 131 have.

Hereinafter, the operation of driving the OIS in the Y-axis direction and the X-axis direction through the posture change of the reflection system 120 will be described with reference to FIG. 5 and FIG.

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

Light of a subject existing in the outside world is reflected through the reflection system 120 and then flows into the imaging element through the lens, so that the path of light flowing into the imaging element changes depending on the posture or angle of the reflection system. As illustrated in FIG. 5 (b), if no current is applied to the SMA wire 170, the light signal enters the predetermined reference position.

When current is applied to the SMA wires 170-1a and 170-2a among the SMA wires 170, the SMA wires 170-1a and 170-2a contract by a length that is functionally proportional to the magnitude of the applied current And the support frame 110, that is, the reflection system 120 is changed in its posture or position in a direction corresponding to the clockwise direction (refer to FIG. 5).

5 (a), when the reflection system 120 changes its position or posture in the clockwise direction, the light source generates a deviation d1 to the left. Therefore, from the viewpoint of an imaging element such as a lens or a CCD, The correction in the negative direction (-) direction (reference left direction in FIG. 5) is performed.

If a current is applied to the SMA wire 170-1b, 170-2b of the SMA wire 170 and a current is not supplied to the SMA wire 170-1a, 170-2a from a corresponding point of view, the SMA wire 170-1b The support frame 110 or the reflection system 120 changes its position or position in a counterclockwise direction (reference to FIG. 5) on the basis of the pivot support 180.

When the reflection system 120 changes its position or attitude in the counterclockwise direction, the incident light generates a shift d2 to the right as shown in FIG. 5 (c). Therefore, from the viewpoint of an imaging element such as a lens or a CCD, (Right direction in FIG. 5) of the Y-axis negative (+) direction is performed.

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

5 (b), when current is not applied to any of the wires of the SMA wire 170, the light enters the predetermined reference position (FIG. 6 (b)), and the hall sensor 155 is moved in the X- The drive driver selects the SMA wire 170 corresponding to this signal among the SMA wires 170 and applies a current of a proper magnitude to the selected SMA wire 170 Respectively.

As shown in FIG. 6A, when current is applied only to the SMA wires 170-1a and 170-1b among the SMA wires 170, the SMA wires 170-1a and 170-1b are functionally And the support frame 110, that is, the reflection system 120, changes its attitude or position in a direction corresponding to the clockwise direction (reference in FIG. 6).

6 (a), when the reflection system 120 changes its position or posture in the clockwise direction, the light entering the left side causes a deviation d1. Thus, from the viewpoint of an imaging element such as a lens or a CCD, The X-axis negative (-) directional compensation (reference left direction in FIG. 6) is performed.

A current is applied only to the SMA wires 170-2a and 170-2b among the SMA wires 170 and a current is not applied to the other SMA wires 170-1a and 170-1b as shown in FIG. The current applied SMA wires 170-2a and 170-2b are contracted by a length that is functionally proportional to the magnitude of the applied current and by this contraction the support frame 110, The position or position thereof changes in a direction corresponding to the counterclockwise direction (refer to FIG. 6).

When the reflection system 120 changes its position or attitude in the counterclockwise direction, the incident light generates a deviation d2 to the right as shown in FIG. 6 (c) (Right direction in FIG. 6) of the X-axis positive (+) direction is performed.

5 and 6 are diagrams for independently explaining the Y-axis direction correction movement and the X-axis direction correction movement, respectively, in order to explain the basic operation relationship of the present invention. Actually, the OIS driving using the wire according to the present invention, It is needless to say that the present invention can be implemented so as to adaptively correspond to the actual shake by applying the driving by the combination.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It should be understood that various modifications may be made in the ordinary skill in the art.

100: Driving device of the present invention
110: support frame 111:
113: stopper 115: sensing magnet
120: Reflectometer
130: base frame 131: wire coupling part
132: hole
140: elastomer
150: circuit board 151: engaging hole
155: hall sensor
160: housing 161: opening
163: Stopper 170: SMA wire
180: Pivot support

Claims (8)

A support frame in which two or more shape memory alloy (SMA) wires are provided at different positions;
A reflector installed in the support frame and changing the path of the light introduced through the opening and introducing the light into 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
And a circuit board for supplying a current to the SMA wire. The semiconductor device according to claim 1, wherein the SMA wire
And a bend shape so that one end and the other end are positioned in the same direction. 3. The apparatus according to claim 2,
And a coupling portion to which the bent portion of the SMA wire is coupled. The semiconductor device according to claim 1, wherein the SMA wire
Wherein the four wires are provided at positions corresponding to each other with respect to the vertical and horizontal directions. The method according to claim 1,
Further comprising a pivot support positioned at a central portion of the base frame and the support frame facing each other. 6. The pivotal support as claimed in claim 5,
Wherein the wire has a shape of a sphere. 6. The method according to claim 5,
A support frame provided at a central portion of the base frame,
Wherein the pivot support is provided in a central hollow portion of the elastic body. A reflection system in which two or more shape memory alloy (SMA) wires are provided at different positions, the path of the light introduced through the opening is changed and introduced into the lens;
A base frame to which the SMA wire is coupled;
An elastic body provided between the counterclockwise and the base frame to elastically support the reflection system; And
And a circuit board for supplying a current to the SMA wire.

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