KR20220134979A - Camera actuator and camera device comprising the same - Google Patents

Abstract

An embodiment of the present invention includes: a housing; a movable unit disposed inside the housing; a piezoelectric body including a driving unit which moves the movable unit, wherein the driving unit expands and contracts in an optical axis direction; a moving shaft connected to the piezoelectric body; and a first movable body and a second movable body disposed to be movable along the moving axis. The first movable body and the second movable body are spaced apart from each other with the moving axis.

Description

CAMERA ACTUATOR AND CAMERA DEVICE COMPRISING THE SAME

The present invention relates to a camera actuator and a camera device including the same.

A camera is a device that takes a picture or video of a subject, and is mounted on a portable device, a drone, a vehicle, or the like. The camera device has an image stabilization (IS) function that corrects or prevents image shake caused by user movement in order to improve image quality, and automatically adjusts the distance between the image sensor and the lens to align the focal length of the lens. It may have a zooming function that increases or decreases the magnification of a distant subject through an auto-focusing (AF) function and a zoom lens.

The image stabilization (IS) technology includes an optical image stabilizer (OIS) technology and an image stabilization prevention technology using an image sensor.

OIS technology is a technology that corrects motion by changing the path of light, and image stabilization technology using an image sensor is a technology that compensates movement by mechanical and electronic methods, but OIS technology is being adopted more and more.

On the other hand, OIS technology is a method of correcting image quality by moving the lens or image sensor of the camera to correct the optical path. In particular, the OIS technology detects camera movement through a gyro sensor and based on this I calculate the distance the image sensor needs to move.

For example, the OIS correction method includes a lens movement method and a module tilting method. In the lens movement method, only the lens in the camera module is moved to realign the optical axis and the center of the image sensor. On the other hand, the module tilting method is a method of moving the entire module including the lens and image sensor.

In particular, the module tilting method has a wider correction range than the lens movement method, and since the focal length between the lens and the image sensor is fixed, it has the advantage of minimizing image distortion.

On the other hand, in the case of the lens movement method, a Hall sensor is used to detect the position and movement of the lens. However, the Hall sensor as described above has linearity when the lens movement distance is small, but has a problem in that the linearity decreases as the lens movement distance increases. In addition, the Hall sensor is greatly affected by the surrounding environment, and has a problem in that reliability is lowered due to heat generated when the camera module is driven.

In particular, the actuator for moving the position of the lens is linearly driven in the optical axis direction, and the internal temperature rises due to the heat generated when the actuator is driven, and thermal deformation of some parts occurs.

For this reason, when the camera actuator is operated for a long time or is operated in a high temperature environment, there is a problem in that the operating life and reliability are deteriorated.

The technical problem to be solved by the present invention is to provide a camera actuator with improved operating life and reliability at high temperatures.

A camera actuator according to an embodiment of the present invention includes a housing; a movable part disposed inside the housing; a piezoelectric body comprising a driving unit for moving the movable unit, wherein the driving unit expands and contracts in an optical axis direction; a moving shaft connected to the piezoelectric body; and a first movable body and a second movable body disposed to be movable along the moving axis, wherein the first and second movable bodies may be spaced apart from each other with respect to the moving axis.

The camera actuator may further include an elastic member for elastically pressing the first moving body and the second moving body in the direction of the moving axis.

The elastic member may include an inorganic material.

The elastic member may be a silicon carbide (SiC) fiber, a metal nanodot, a metal fiber, a carbon nanotube (CNT), a carbon nanodot, or a carbon fiber. ) and mixtures thereof.

The elastic member may include Velcro.

A voltage supply unit for supplying a voltage to the first and second moving bodies may be further included, and charges having different polarities may be generated on surfaces of the first and second moving bodies to which the voltage is supplied.

The first mobile body and the second mobile body may include one material selected from the group consisting of Teflon, Cyclic Transparency Optical Polymer, Polytetrafluoroethylene (PTFE), and mixtures thereof.

The first movable body includes a first surface facing the second movable body, the second movable body includes a second surface facing the first surface, and a space between the first surface and the second surface is provided. The distance may be smaller than the diameter of the moving shaft.

The first movable body may include a first concave portion for arranging one side of the moving shaft, and the second movable body may include a second concave portion for disposing the other side of the moving shaft.

The first concave portion and the second concave portion may include a contact area in contact with the side surface of the moving shaft and a non-contact area spaced apart from the side surface of the moving shaft.

An area of the non-contact area may be greater than an area of the contact area.

The first concave portion and the second concave portion may have a concave curvature toward the side surface of the moving shaft, and the first concave portion and the second concave portion may have curvatures greater than a curvature of the moving shaft side surface.

According to an embodiment of the present invention, it is possible to prevent the thermal deformation of the elastic member in a high-temperature environment by applying an inorganic material or Velcro to the elastic member. Accordingly, it is possible to secure the operating life and reliability of the camera actuator even if it is operated for a long time or is operated in a high temperature environment.

In addition, it is possible to provide a camera actuator applicable to ultra-slim, ultra-compact and high-resolution cameras. In particular, the actuator for OIS can be efficiently disposed without increasing the overall size of the camera device.

1 is a perspective view of a camera module according to an embodiment;
2 is an exploded perspective view of a camera module according to an embodiment;
3 is a cross-sectional view schematically showing a camera actuator according to an embodiment;
4 is a perspective view of a driving unit of a camera actuator according to an embodiment;
5A and 5B are views for explaining a principle in which a movable part is raised by a driving part of a camera actuator according to an embodiment;
6A and 6B are views for explaining a principle in which a movable part is lowered by a driving part of a camera actuator according to an embodiment;
7 is a plan view of a driving unit according to an embodiment;
8 is an exploded perspective view of a first movable body and a second movable body according to an embodiment;
9 is a plan view of a first movable body, a second movable body, and a moving shaft in a driving unit according to an embodiment;
10 is an enlarged plan view of a first movable body, a second movable body, and a portion of a movable shaft in a driving unit according to an embodiment;
11 is a perspective view of an elastic member according to an embodiment;
12 is a perspective view of a driving unit of a camera actuator according to another embodiment;
13 is a plan view of a driving unit of a camera actuator according to another embodiment;
14 is a view showing a first example of area A of FIG. 13;
15 is a view showing a second example of area A of FIG. 13;
16 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied;
17 is a perspective view of a vehicle to which a camera module according to an embodiment is applied.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated and described in the drawings. However, it does not specifically

It is not intended to limit the embodiment, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms including an ordinal number such as second, first, etc. may be used to describe various elements, but the elements are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary 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

Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings, but the same or corresponding components are given the same reference numerals regardless of the reference numerals, and the overlapping description thereof will be omitted.

1 is a perspective view of a camera module according to an embodiment, and FIG. 2 is an exploded perspective view of a camera module according to the embodiment.

1 and 2 , the camera module 1000 according to the embodiment may include a cover CV, a first camera actuator 1100 , a second camera actuator 1200 , and a circuit board 1300 . . Here, the first camera actuator 1100 may be used as a first actuator, and the second camera actuator 1200 may be used as a second actuator.

The cover CV may cover the first camera actuator 1100 and the second camera actuator 1200 . The coupling force between the first camera actuator 1100 and the second camera actuator 1200 may be improved by the cover CV.

Furthermore, the cover CV may be made of a material that blocks electromagnetic waves. Accordingly, the first camera actuator 1100 and the second camera actuator 1200 in the cover CV can be easily protected.

In addition, the first camera actuator 1100 may be an OP1tical Image Stabilizer (OIS) actuator.

The first camera actuator 1100 may include fixed focal length les disposed on a predetermined barrel (not shown). Fixed focal length les may be referred to as “single focal length lenses” or “single focal length lenses”.

The first camera actuator 1100 may change the path of the light. In an embodiment, the first camera actuator 1100 may vertically change a light path through an optical member (eg, a mirror) therein. With this configuration, even if the thickness of the mobile terminal is reduced, a lens configuration larger than the thickness of the mobile terminal is disposed in the mobile terminal through a change in the optical path, so that magnification, auto-focusing (AF) and OIS functions can be performed.

The second camera actuator 1200 may be disposed behind the first camera actuator 1100 . The second camera actuator 1200 may be coupled to the first camera actuator 1100 . And the mutual coupling may be made by various methods.

Also, the second camera actuator 1200 may be a zoom actuator or an auto focus (AF) actuator. For example, the second camera actuator 1200 may support one or a plurality of lenses and may perform an auto-focusing function or a zoom function by moving the lenses according to a control signal of a predetermined controller.

The circuit board 1300 may be disposed behind the second camera actuator 1200 . The circuit board 1300 may be electrically connected to the second camera actuator 1200 and the first camera actuator 1100 . Also, there may be a plurality of circuit boards 1300 .

The camera module according to the embodiment may be formed of a single or a plurality of camera modules. For example, the plurality of camera modules may include a first camera module and a second camera module.

And the first camera module may include a single or a plurality of actuators. For example, the first camera module may include a first camera actuator 1100 and a second camera actuator 1200 .

In addition, the second camera module may be disposed in a predetermined housing (not shown) and include an actuator (not shown) capable of driving the lens unit. The actuator may be a voice coil motor, a micro actuator, a silicon actuator, etc., and may be applied in various ways such as an electrostatic method, a thermal method, a bimorph method, an electrostatic force method, and the like, but is not limited thereto. Also, in this specification, the camera actuator may be referred to as an actuator or the like. In addition, a camera module including a plurality of camera modules may be mounted in various electronic devices such as a mobile terminal.

3 is a cross-sectional view schematically illustrating a camera actuator according to an embodiment.

Referring to FIG. 3 , the second camera actuator 1200 according to the embodiment may include a housing 1210 , a movable part 1220 , a driving part 1230 , and a guide part 1240 .

In addition, the second camera actuator 1200 may further include a second shield can (not shown), an elastic part (not shown), and a bonding member (not shown). Furthermore, the second camera actuator 1200 according to the embodiment may further include an image sensor.

First, the housing 1210 may be located outside the second camera actuator 1200 . The housing 210 may form an internal space. In this case, the movable part 1220 , the driving part 1230 , and the guide part 1240 may be disposed in the inner space of the housing 1210 .

The movable part 1220 may include at least one lens. The movable part 1220 may be installed to be movable in the third direction (Z-axis direction) in the inner space of the housing 1210 . Accordingly, the above-described AF function may be performed.

Specifically, the movable part 1220 may include a first movable part 1220a and a second movable part 1220b. The first movable part 1220a and the second movable part 1220b may be spaced apart from each other in the third direction (Z direction). In addition, the positions of the first movable part 1220a and the second movable part 1220b may be moved in the third direction (Z direction) by the driving of the driving part 1230 .

More specifically, the first movable part 1220a and the second movable part 1220b may be connected to different driving parts 1230a and 1230b so that their positions in the third direction (Z direction) may be individually moved. Accordingly, the distance in the third direction (Z direction) between the first movable part 1220a and the second movable part 1220b may change.

The first movable part 1220a may include a first lens assembly 1221a and a first mover 1222a. In addition, the second movable part 1220b may include a second lens assembly 1221b and a second mover 1222b.

The first lens assembly 1221a and the second lens assembly 1221b may each include at least one lens. In addition, the first lens assembly 1221 and the second assembly 1221b may be coupled to the first mover 1222a and the second mover 1222b, respectively. The first mover 1222a and the second mover 1222b may be moved in the third direction (Z direction) by receiving driving force from different driving units 1230a and 1230b, respectively.

The driving unit 1230 may be fixedly installed inside the housing 1210 .

The driving unit 1230 may include a first driving unit 1230a and a second driving unit 1230b. The first driving unit 1230a and the second driving unit 1230b may be spaced apart from each other in the second direction (Y direction). The first driving part 1230a may be connected to the first movable part 1220a to provide a driving force. In addition, the second driving unit 1230b may be connected to the second moving unit 1220b to provide a driving force.

The guide unit 1240 may be fixedly installed inside the housing 210 . The guide unit 1240 may guide the movement of the movable unit 1220 .

The guide part 1240 may include a first guide part 1240a and a second guide part 1240b. The first guide part 1240a may be connected to the first movable part 1220a to guide the first movable part 1220a moving in the third direction (Z-axis direction). In addition, the second guide part 1240b may be connected to the second movable part 1220b to guide the second movable part 1220b moving in the third direction (Z-axis direction).

4 is a perspective view illustrating a driving unit.

Referring to FIG. 4 , the driving unit 1230 according to the embodiment may include a piezoelectric body 1231 , a moving shaft 1232 , a moving body 1233 , and an elastic member 1234 .

The piezoelectric body 1231 may be formed of a piezoelectric element. According to an embodiment, the piezoelectric body 1231 may include a piezoelectric element made of a ceramic material.

According to an embodiment, the piezoelectric body 1231 may have an electric field formed due to voltage application, and the length may change. More specifically, the piezoelectric body 1231 may be formed of a crystal lattice in which positive and negative ions are elastically connected. Accordingly, in the piezoelectric body 1231 , positive and negative ions may move when an electric field is formed. For example, positive ions may be pulled in the direction of the electric field and negative ions may be pulled in a direction opposite to the direction of the electric field. And a stress corresponding to this movement or force is generated, and the crystal lattice may be deformed.

The piezoelectric body 1231 may be a polycrystal, and the crystal lattice may be divided into several polarizations having different polarization directions in general. In addition, the polarization from the polarization state to the whole may be a state in which the polarization is canceled. In this case, when an electric field is applied to the piezoelectric body 1231 , the polarization direction inside the crystal is polarized according to the electric field direction, and the length of the crystal grains may be increased in the electric field direction at the same time. Conversely, if the electric field is removed, the whole can remain polarized. Accordingly, the piezoelectric body 1231 may operate in an elongated state in which each crystal is stretched or a reduced state in which the crystals are reduced according to a voltage. In other words, the piezoelectric body 1231 may perform mechanical deformation (contraction and contraction in the third direction (Z-axis direction)) when an electrical signal such as a voltage is applied. According to this configuration, the second camera actuator according to the embodiment has no electromagnetic interference and has little influence on the shape, so it is possible to provide high reliability and improved energy efficiency.

The moving shaft 1232 may be connected to the piezoelectric body 1231 . The moving shaft 1232 may be in the form of a shaft. In this case, the moving shaft 1232 may be disposed in the third direction (Z-axis direction). Accordingly, the moving shaft 1232 may move in the third direction (Z-axis direction) in response to the expansion and contraction of the piezoelectric body 1231 .

The movable body 1233 may be connected to the movable shaft 1232 . The movable body 1233 may be installed to be movable in the third direction (Z-axis direction) along the moving axis 1232 . The position of the movable body 1233 in the third direction (Z-axis direction) on the movable shaft 1232 may be changed according to the expansion and contraction of the piezoelectric body 1231 .

The elastic member 1234 may surround the movable body 1233 . In this case, the elastic member 1234 may elastically press the movable body 1233 in the direction of the moving shaft 1232 . At this time, the movable body 1233 may be maintained in a third direction (Z-axis direction) position on the movable shaft 1232 by the elastic pressing force. Meanwhile, the movable body 1233 may move in the third direction (Z-axis direction) when a predetermined external force is applied. In this case, a frictional force may be generated between the moving body 1233 and the moving shaft 1232 .

5A and 5B are views for explaining the principle that the movable part is raised by the driving part of the camera actuator according to the embodiment, and FIGS. 6A and 6B are the driving part of the camera actuator according to the embodiment. is a drawing that

The piezoelectric body 1231 may expand and contract according to an applied voltage. For example, the piezoelectric part may expand when the voltage to which the voltage is applied increases (F1aa, FIG. 5B) and shrink when the voltage decreases (F1ab, FIG. 6B).

Referring to FIGS. 5A and 5B , the expansion and contraction of the piezoelectric part is controlled according to the first driving signal PS1 , and the position of the movable body 123 on the moving shaft 1232 may be changed.

For example, when a voltage is applied for a predetermined time (t0 to t1) and the piezoelectric body 1231 and the moving shaft 1232 are extended at a predetermined speed or less, the movable body 1233 may have the same position on the moving shaft 1232. . That is, the distance between the piezoelectric body 1231 and the movable body 1233 may be maintained (d1).

However, when the voltage is applied for a predetermined time (t1 to t2) and the piezoelectric body 1231 and the moving shaft 1232 are reduced at a speed greater than the predetermined speed, the moving body 1233 will change its position on the moving shaft 1232. can The total voltage ST2 applied during the times t1 to t2 may be the same as the total voltage ST1 applied during the times t0 to t1. For example, the magnitude of the voltage may be greater at times t1 to t2 than at times t0 to t1. This may be changed according to the piezoelectric body 1231 . Hereinafter, when a + voltage is applied to the piezoelectric body 1231 , the length of the piezoelectric body 1231 is extended in the third direction (Z-axis direction), and when a - voltage is applied to the piezoelectric body 1231 , the length of the piezoelectric body 1231 is the third direction (Z-axis direction).

Accordingly, the position of the movable body 1233 is maintained by inertia, so that the relative position on the moving shaft 1232 may be the same as the extension direction. That is, the distance between the movable body 1233 and the piezoelectric body 1231 may increase (increase from d1 to d2). That is, finally, even when the length of the piezoelectric body 1231 is the same by the application of the first driving signal PS1, the position between the piezoelectric body 1231 and the movable body 1233 increases, so that the movable body 1233 and the movable part connected thereto are in the third direction. can move in the opposite direction.

This first driving signal PS1 may be repeated several times for a predetermined time. For example, the first driving signal may be repeatedly applied to the piezoelectric body 1231 100 times per second.

6A and 6B , the expansion and contraction of the piezoelectric body 1231 is controlled according to the second driving signal PS1 ′, and the position of the movable body 1233 on the moving shaft 1232 may be changed.

For example, when a voltage is applied for a predetermined time (t0' to t1') and the piezoelectric body 1231 and the moving shaft 1232 are reduced below a predetermined speed, the movable body 1233 may have the same position on the moving shaft 1232 . can That is, the distance between the movable body 1233 and the piezoelectric body 1231 may be maintained (d3).

However, when the voltage is applied for a predetermined time (t1' to t2') and the piezoelectric body 1231 and the moving shaft 1232 are extended at a speed greater than the predetermined speed, the moving body 1233 is positioned on the moving shaft 1232. can be changed. The total voltage ST2' applied during the times t1' to t2' may be the same as the total voltage ST1' applied during the times t0' to t1'. For example, the magnitude of the voltage may be greater at times t1 to t2' than at times t0' to t1'. This may be changed according to the piezoelectric body 1231 as described above.

Accordingly, the position of the movable body 1233 is maintained by inertia, so that the relative position on the moving shaft 1232 may be the same as the extension direction. That is, the distance between the movable body 1233 and the piezoelectric body 1231 may be decreased (reduced from d3 to d4). That is, finally, even though the length of the piezoelectric body 1231 is the same by the application of the second driving signal PS1', the position between the piezoelectric body 1231 and the movable body 1233 is reduced, so that the movable body 1233 and the movable part connected thereto are connected in the third direction. can move to

This second driving signal PS1' may be repeated several times for a predetermined time. For example, the second driving signal may be repeatedly applied to the piezoelectric unit 100 times per second.

7 is a plan view of a driving unit according to an exemplary embodiment, FIG. 8 is an exploded perspective view of a first movable body and a second movable body according to an exemplary embodiment, and FIG. 9 is a first movable body and a second movable body in the driving unit according to an exemplary embodiment; and a plan view of the moving shaft, and FIG. 10 is an enlarged plan view of the first moving body, the second moving body, and a portion of the moving shaft in the driving unit according to an exemplary embodiment.

7 to 10 , the movable body 1233 may include a first movable body 1233a and a second movable body 1233b. In this case, the first movable body 1233a and the second movable body 1233b may be members having the same shape, but is not limited thereto.

The first movable body 1233a and the second movable body 1233b may be spaced apart from each other in a direction perpendicular to the third direction (Z-axis direction). In addition, a moving shaft 1232 may be disposed between the first moving body 1233a and the second moving body 1233b. In this case, the third direction (Z-axis direction) length L1 of the first movable body 1233a and the second movable body 1233b may be greater than the third direction length of the elastic member 1234 .

According to an embodiment, the first movable body 1233a and the second movable body 1233b may include bodies 1233a1 and 1233b1 and steps 1233a2 and 1233b2. The bodies 1233a1 and 1233b1 may overlap the elastic member 1234 in a radial direction. The elastic member 1234 may surround the outer peripheral surfaces of the bodies 1233a1 and 1233b1. In addition, the steps 1233a2 and 1233b2 may extend radially from the bodies 1233a1 and 1233b1. At this time, the steps 1233a2 and 1233b2 overlap the elastic member 1234 in the third direction (Z direction) to prevent the elastic member 1234 from being separated in the third direction (Z direction).

The first movable body 1233a may include a first surface 1233as disposed toward the second movable body 1233b. Also, the second movable body 1233b may include a second surface 1233bs facing the first surface 1233as. In addition, the moving shaft 1222 may be disposed between the first surface 1233as and the second surface 1233bs.

The first movable body 1233a may include a first concave portion 1233ag disposed on one surface. The first concave portion 1233ag may be concave toward the second movable body 1233b. One side of the moving shaft 1232 may be disposed in the first concave portion 1233ag.

The second movable body 1233b may include a second concave portion 1233bg disposed on one surface. The second concave portion 1233bg may be concave toward the first movable body 1233a. The other side of the moving shaft 1232 may be disposed in the second concave portion 1233bg.

Accordingly, the first concave portion 1233ag and the second concave portion 1233bg may have a concave curvature toward the moving shaft 1232 . In this case, the maximum distance d1' between the first concave portion 1233ag and the second concave portion 1233bg may be greater than the distance d2' between the first surface 1233as and the second surface 1233bs. . In addition, the maximum distance d1 ′ between the first concave portion 1233ag and the second concave portion 1233bg may be greater than the diameter d′ of the moving shaft 1232 . Meanwhile, the distance d2' between the first surface 1233as and the second surface 1233bs may be smaller than the diameter d' of the moving shaft 1232 .

The first concave portion 1233ag and the second concave portion 1233bg may have the same curvature. In addition, the curvature of the first concave portion 1233ag and the second concave portion 1233bg may be greater than the curvature of the side surface of the moving shaft 1232 . That is, the radius of curvature R1 of the first concave portion 1233ag and the second concave portion 1233bg may be smaller than the radius of curvature R2 of the side surface of the moving shaft 1232 .

Accordingly, the first concave portion 1233ag and the second concave portion 1233bg may include a contact area CA and a non-contact area NCA, respectively. The contact area CA may be in contact with a side surface of the moving shaft 1232 . In addition, the non-contact area NCA may be spaced apart from a side surface of the moving shaft 1232 . In this case, the area of the non-contact area NCA of the first concave portion 1233ag and the second concave portion 1233bg may be larger than that of the contact area CA.

11 is a perspective view of an elastic member according to an embodiment.

Referring to FIG. 11 , the elastic member 1234 may have a band shape. The elastic member 1234 may surround the outer circumferential surface of the moving body and provide an elastic pressing force in the moving axis direction.

The elastic member 1234 may have a hardness of 30 to 50. According to an embodiment, the elastic member 1234 may include rubber. In addition, the elastic member 1234 may include an inorganic material. More preferably, silicon carbide (SiC) fiber, metal nanodot, metal fiber (Metal fiber), carbon nanotube (Carbon Nano Tube, CNT), carbon nanodot (Carbon nanodot), carbon fiber (Carbon) fiber) and at least one material selected from the group consisting of mixtures thereof.

According to an embodiment, the elastic member 1234 may include Velcro.

Since the elastic member 1234 has elasticity and is less thermally deformed at a high temperature, it is possible to increase the high-temperature reliability of the camera actuator and improve the operation performance.

Hereinafter, the driving unit 2200 of the camera actuator according to another embodiment of the present invention will be described.

12 is a perspective view of a driving unit of a camera actuator according to another embodiment, FIG. 13 is a plan view of a driving unit of a camera actuator according to another embodiment, and FIG. 14 is a view showing a first example of area A of FIG. FIG. 15 is a diagram illustrating a second example of area AA′ of FIG. 13 .

12 and 13 , the driving unit 2200 may include a piezoelectric body 2210 , a moving shaft 2220 , a moving body 2230 , and a power supply unit (not shown). In this case, the piezoelectric body 2210 is the same member as the piezoelectric body 1231 described in FIG. 4 , the moving shaft 2220 is the same member as the moving shaft 1232 described in FIG. 4 , and the moving body 2230 is the moving body described in FIG. 4 . It may be the same member as (1233). Accordingly, a detailed description of the same member is omitted.

The movable body 2230 may include a first movable body 2230a and a second movable body 2230b. In this case, the first movable body 2230a and the second movable body 2230b may be members of the same shape, but is not limited thereto.

The first movable body 2230a and the second movable body 2230b may be spaced apart from each other in a direction perpendicular to the third direction (Z-axis direction). In addition, a moving shaft 2220 may be disposed between the first moving body 2230a and the second moving body 2230b.

The first movable body 2230a may include a first concave portion 2230ag disposed on one surface. The first concave portion 2230ag may be concave toward the second movable body 2230b. One side of the moving shaft 2220 may be disposed in the first concave portion 2230ag.

The second movable body 2230b may include a second concave portion 2230bg disposed on one surface. The second concave portion 2230bg may be concave toward the first movable body 2230a. The other side of the moving shaft 2220 may be disposed in the second concave portion 2230bg.

The first concave portion 2230ag and the second concave portion 2230bg may have a concave curvature toward the moving shaft 2220 . In this case, the maximum distance d3 ′ between the first concave portion 2230ag and the second concave portion 2230bg may be greater than the distance d4 ′ between the first movable body 2230a and the second movable body 2230b. . In addition, the maximum distance d3 ′ between the first concave portion 2230ag and the second concave portion 2230bg may be greater than the diameter of the moving shaft 2220 .

The first movable body 2230a and the second movable body 2230b may be connected to a power supply unit (not shown) to receive power. In addition, the first movable body 2230a and the second movable body 2230b may generate an electric field. The first movable body 2230a may have a first polarity. In addition, the second movable body 2230b may have a polarity opposite to the first polarity. Accordingly, the first movable body 2230a and the second movable body 2230b may act by mutual attraction. The first movable body 2230a and the second movable body 2230b may contact the movable shaft 220 with a predetermined frictional force.

The first movable body 2230a and the second movable body 2230b may be one or more materials selected from the group consisting of Teflon, Cyclic Transparency Optical Polymer, PTFE (Polytetrafluoroethylene), and mixtures thereof. The first movable body 2230a and the second movable body 2230b may generate electric charges having different polarities on their facing surfaces. In this case, the distance d3 ′ between the first movable body 2230a and the second movable body 2230b may be smaller than the diameter of the movable shaft 1232 . The first movable body 2230a and the second movable body 2230b are respectively It may include a protrusion 2231 disposed on the facing surface. These protrusions 2231 may increase frictional force with the moving shaft 2220 .

Referring to FIG. 14 , the first movable body 2230a may include a 1a protrusion 2231a on a surface facing the second movable body 2230b. In addition, the second movable body 2230b may include a 1b protrusion 2231b on a surface facing the first movable body 2230a.

The 1a protrusion 2231a and the 1b protrusion 2231b may have a triangular cross-sectional shape. The 1a protrusion 2231a and the 1b protrusion 2231b may include an edge at an end thereof. In this case, the protrusion lengths of the 1a protrusion 2231a and the 1b protrusion 2231b may be smaller than the distance d4' between the first movable body 2230a and the second movable body 2230b. In addition, the 1a protrusion 2231a and the 1b protrusion 2231b may not overlap in the separation direction of the first movable body 2230a and the second movable body 2230b.

Meanwhile, referring to FIG. 15 , the first movable body 2230a may include a 2a protrusion 2232a on a surface facing the second movable body 2230b. In addition, the second movable body 2230b may include a 2b protrusion 2232b on a surface facing the first movable body 2230a.

The second a protrusion 2232a and the second b protrusion 2232b may have a rectangular cross-sectional shape. In this case, the protrusion lengths of the 2a protrusion 2232a and the 2b protrusion 2232b may be smaller than the distance d4' between the first movable body 2230a and the second movable body 2230b. In addition, the 2a protrusion 2232a and the 2b protrusion 2232b may not overlap in the separation direction of the first movable body 2230a and the second movable body 2230b.

16 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied.

Referring to FIG. 16 , the mobile terminal 1500 according to the embodiment may include a camera module 1000 , a flash module 1530 , and an auto-focus device 1510 provided on the rear side.

The camera module 1000 may include an image capturing function and an auto focus function. For example, the camera module 1000 may include an auto-focus function using an image.

The camera module 1000 processes an image frame of a still image or a moving image obtained by an image sensor in a shooting mode or a video call mode.

The processed image frame may be displayed on a predetermined display unit and stored in a memory. A camera (not shown) may also be disposed on the front of the mobile terminal body.

For example, the camera module 1000 may include a first camera module 1000 and a second camera module 1000, and OIS may be implemented together with an AF or zoom function by the first camera module 1000A. can

The flash module 1530 may include a light emitting device that emits light therein. The flash module 1530 may be operated by a camera operation of a mobile terminal or a user's control.

The autofocus device 1510 may include one of the packages of the surface light emitting laser device as a light emitting part.

The auto-focusing device 1510 may include an auto-focusing function using a laser. The auto focus device 1510 may be mainly used in a condition in which the auto focus function using the image of the camera module 1000 is deteriorated, for example, close to 10 m or less or in a dark environment.

The autofocus device 1510 may include a light emitting unit including a vertical cavity surface emitting laser (VCSEL) semiconductor device and a light receiving unit that converts light energy such as a photodiode into electrical energy.

17 is a perspective view of a vehicle to which a camera module according to an embodiment is applied.

For example, FIG. 12 is an external view of a vehicle including a vehicle driving assistance device to which the camera module 1000 according to an embodiment is applied.

Referring to FIG. 17 , the vehicle 700 according to the embodiment may include wheels 13FL and 13FR that rotate by a power source and a predetermined sensor. The sensor may be the camera sensor 2000, but is not limited thereto.

The camera 2000 may be a camera sensor to which the camera module 1000 according to the embodiment is applied. The vehicle 700 of the embodiment may acquire image information through a camera sensor 2000 that captures a front image or a surrounding image, and determines a lane unidentified situation using the image information and generates a virtual lane when unidentified can do.

For example, the camera sensor 2000 may acquire a front image by photographing the front of the vehicle 700 , and a processor (not shown) may obtain image information by analyzing an object included in the front image.

For example, when an object such as a median, curb, or street tree corresponding to a lane, an adjacent vehicle, a driving obstacle, and an indirect road mark is captured in the image captured by the camera sensor 2000, the processor detects the object to be included in the video information. In this case, the processor may further supplement the image information by acquiring distance information from the object detected through the camera sensor 2000 .

The image information may be information about an object photographed in an image. The camera sensor 2000 may include an image sensor and an image processing module.

The camera sensor 2000 may process a still image or a moving image obtained by an image sensor (eg, CMOS or CCD).

The image processing module may process a still image or a moving image obtained through the image sensor, extract necessary information, and transmit the extracted information to the processor.

In this case, the camera sensor 2000 may include a stereo camera to improve the measurement accuracy of the object and further secure information such as the distance between the vehicle 700 and the object, but is not limited thereto.

In the above, the embodiment has been mainly described, but this is only an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are not exemplified above in the range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (10)

housing;
a movable part disposed inside the housing;
and a driving unit for moving the movable unit,
the driving unit
a piezoelectric body that expands and contracts in the optical axis direction;
a moving shaft connected to the piezoelectric body; and
It includes a first movable body and a second movable body that are movably arranged along the moving axis,
The first moving body and the second moving body are spaced apart from each other with respect to the moving axis. According to claim 1,
The camera actuator further comprising an elastic member for elastically pressing the first moving body and the second moving body in the direction of the moving axis. 3. The method of claim 2,
The elastic member is a camera actuator comprising an inorganic material. 3. The method of claim 2,
The elastic member may be a silicon carbide (SiC) fiber, a metal nanodot, a metal fiber, a carbon nanotube (CNT), a carbon nanodot, or a carbon fiber. ) and a camera actuator comprising at least one material selected from the group consisting of mixtures thereof. 3. The method of claim 2,
The elastic member is a camera actuator comprising a Velcro (Velcro). According to claim 1,
Further comprising a voltage supply unit for supplying a voltage to the first moving body and the second moving body,
A camera actuator in which electric charges of different polarities are generated on the surfaces of the first and second movable bodies to which voltage is supplied. 7. The method of claim 6,
The first movable body and the second movable body are
A camera actuator comprising at least one material selected from the group consisting of Teflon, Cyclic Transparency Optical Polymer, PTFE (Polytetrafluoroethylene), and mixtures thereof. According to claim 1,
The first movable body includes a first surface facing the second movable body,
The second movable body includes a second surface facing the first surface,
A distance between the first surface and the second surface is smaller than a diameter of the moving shaft. According to claim 1,
The first moving body includes a first concave portion for arranging one side of the moving shaft,
The second moving body is a camera actuator including a second concave portion for arranging the other side of the moving shaft. 10. The method of claim 9,
The first concave portion and the second concave portion
A camera actuator comprising a contact area in contact with a side surface of the moving shaft and a non-contact area spaced apart from the side surface of the moving shaft.

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