KR20220133564A - Camera actuator and camera device comprising the same - Google Patents

Abstract

An embodiment of the present invention discloses a camera actuator that includes: an optical member; a piezo driving part driven by a driving signal and moving the optical member; and a piezo driver connected to the piezo driving part to drive the piezo driving part. The piezo driver includes: a receiving part for receiving temperature data; and a control part for reducing the magnitude of the driving signal when the temperature data are greater than a preset first temperature.

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.

On the other hand, the resolution of the image sensor increases as the pixel becomes higher and the size of the pixel becomes smaller. As the pixel becomes smaller, the amount of light received for the same time decreases. Therefore, the higher the pixel camera, the more severe the image shake caused by hand shake that occurs when the shutter speed is slowed in a dark environment. As a representative image stabilization (IS) technology, there is an optical image stabilizer (OIS) technology that corrects motion by changing the path of light.

According to the general OIS technology, the movement of the camera is detected through a gyrosensor, etc., and the lens is tilted or moved based on the detected movement, or the camera module including the lens and the image sensor can be tilted or moved. . When a lens or a camera module including a lens and an image sensor is tilted or moved for OIS, it is necessary to additionally secure a space for tilting or moving around the lens or camera module.

Meanwhile, an actuator for OIS may be disposed around the lens. At this time, the actuator for OIS may include two axes perpendicular to the optical axis Z, that is, an actuator in charge of X-axis tilting and an actuator in charge of Y-axis tilting.

However, according to the needs of ultra-slim and ultra-small camera devices, there is a large space constraint for arranging the actuator for OIS, and there is sufficient space for tilting or moving the lens or the camera module itself including the lens and the image sensor for OIS. It can be difficult to guarantee. In addition, the higher the pixel camera, the larger the size of the lens is desirable to increase the amount of light received.

In addition, when the zoom function, the AF function, and the OIS function are all included in the camera device, there is a problem in that the magnet for OIS and the magnet for AF or zoom are disposed close to each other to cause magnetic field interference.

However, the camera actuator by the piezoelectricity has a problem in that the performance change occurs due to temperature.

The technical problem to be solved by the present invention is to provide a camera actuator applicable to an ultra-slim, ultra-small and high-resolution camera.

In addition, it is possible to provide a camera actuator with improved driving stability in response to temperature changes.

In addition, it is possible to provide a camera actuator that provides an optimal driving speed.

A camera actuator according to an embodiment of the present invention includes an optical member; a piezo driving unit driven by a driving signal and moving the optical member; and a piezo driver connected to the piezo driver to drive the piezo driver, wherein the piezo driver includes: a receiver configured to receive temperature data; and a controller configured to decrease the level of the driving signal when the temperature data is greater than a preset first temperature.

The piezo driver may further include a resistor connected to the output terminal of the driving signal, and the controller may change the resistance of the resistor to reduce the magnitude of the driving signal.

The controller may increase the resistance of the resistor if the resistance is greater than the first temperature through the temperature data.

When the temperature data through the temperature data is smaller than the second temperature, the controller may decrease the resistance of the resistor unit.

The second temperature may be less than the first temperature.

The piezo driver may further include a switch unit connected to the front end of the resistor unit and a comparison unit connected to the front end of the switch unit.

The control unit adjusts an input comparison signal applied to the comparator through the temperature data, the switch unit drives on/off according to an output of the comparator corresponding to the input comparison signal, and the resistor unit turns on/off the switch unit Resistance may change in response to off.

The driving signal may be a pulse width modulation signal.

The controller may decrease the frequency of the driving signal when the temperature data is greater than the first temperature again after reducing the magnitude of the driving signal.

It may further include; a temperature sensing unit for generating the temperature data.

The piezo driving unit may include a piezoelectric unit that expands and contracts in one direction; a link part connected to the piezoelectric part; and a moving unit connected to the link unit.

The moving part may move in the one direction in response to the expansion/contraction speed of the piezoelectric part to move the optical member.

The piezo driving unit may include: a movable unit connected to the moving unit and in contact with a rotating plate for moving the optical member; and a suction unit disposed adjacent to the rotation plate.

The suction unit may pull the rotation plate.

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

According to an embodiment of the present invention, tilting in the X-axis direction and tilting in the Y-axis direction do not cause magnetic field interference with each other, and tilting in the X-axis direction and tilting in the Y-axis direction can be implemented with a stable structure, and for AF or Even with the actuator for zooming, it does not cause magnetic field interference, so precise OIS function can be realized.

In addition, it is possible to implement a camera actuator with improved driving stability in response to temperature changes.

In addition, it is possible to implement a camera actuator that provides an optimal driving speed.

According to the embodiment of the present invention, it is possible to secure a sufficient amount of light by eliminating the size limitation of the lens, and it is possible to implement OIS with low power consumption.

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 taken along line AA' in FIG. 1;
4 is a perspective view of a first camera actuator according to an embodiment;
5 is an exploded perspective view of a first camera actuator according to an embodiment;
6 is a perspective view of a holder of a first camera actuator according to an embodiment;
7 is a perspective view of a bracket of a first camera actuator according to an embodiment;
8A is a perspective view of a first driving unit of a first camera actuator according to an embodiment;
8B is an exploded perspective view of a first driving unit of a first camera actuator according to an embodiment;
8C is a side view of the first movable part of the first camera actuator according to the embodiment;
9A is a perspective view of a second driving unit of the first camera actuator according to the embodiment;
9B is an exploded perspective view of a second driving unit of the first camera actuator according to the embodiment;
9C is a perspective view of a first movable part of a first camera actuator according to an embodiment;
9D is a side view of a first movable part of a first camera actuator according to an embodiment;
10 is a perspective view of a first substrate unit and a position sensor unit of a first camera actuator according to an embodiment;
11 is a perspective view of a rotating part and an optical member of a first camera actuator according to an embodiment;
12 is a perspective view of a rotating part of a first camera actuator according to an embodiment;
13 is a front view of the rotating part of the first camera actuator according to the embodiment;
14 is a top perspective view of a first camera actuator according to an embodiment;
15 is a front view of the first camera actuator with the rotating part and the optical member removed according to the embodiment;
16A and 16B are views for explaining the advance by the first driving unit of the first camera actuator according to the embodiment;
17A and 17B are views for explaining the reverse movement by the first driving unit of the first camera actuator according to the embodiment;
18 is a perspective view of a second camera actuator according to the embodiment;
19 is an exploded perspective view of a second camera actuator according to the embodiment;
20 is a cross-sectional view taken along DD' in FIG. 18;
21 is a cross-sectional view taken along line EE' in FIG. 18;
22 is a block diagram of a camera actuator according to an embodiment;
23 is a view for explaining the function of the control unit of the camera actuator according to the embodiment,
24 is a view showing the temperature with respect to the operating time of the piezoelectric drive unit according to the embodiment;
25 is a view showing the movement speed of the piezoelectric part or the moving part corresponding to the temperature and frequency,
26 is a view showing the output of the driving signal corresponding to the first temperature and the second temperature,
27 is a view for explaining the operation of the comparison unit of the camera actuator according to the embodiment,
28 is a view for explaining the operation of the switch unit and the resistor unit according to the embodiment,
29 is a view for explaining driving by a control unit according to an embodiment;
30 is a view for explaining driving by a control unit according to a modified example;
31 is a view for explaining additional driving by the control unit according to the embodiment;
32 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied;
33 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, FIG. 2 is an exploded perspective view of a camera module according to the embodiment, and FIG. 3 is a cross-sectional view taken along line AA′ in FIG. 1 .

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 also 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.

Referring to FIG. 3 , the camera module according to the embodiment may include a first camera actuator 1100 performing an OIS function and a second camera actuator 1200 performing a zooming function and an AF function.

Light may be incident into the camera module through the opening area located on the upper surface of the first camera actuator 1100 . That is, the light may be incident into the interior of the first camera actuator 1100 along the optical axis direction (eg, the X-axis direction), and the optical path may be changed in the vertical direction (eg, the Z-axis direction) through the optical member. In addition, the light may pass through the second camera actuator 1200 and be incident to the image sensor IS located at one end of the second camera actuator 1200 (PATH).

In this specification, the bottom means one side in the first direction. And the first direction is the X-axis direction in the drawing. The second direction is the Y-axis direction in the drawing. The second direction is a direction perpendicular to the first direction. In addition, the third direction is the Z-axis direction in the drawing. The direction is perpendicular to both the first direction and the second direction. Here, the third direction (Z-axis direction) corresponds to the direction of the optical axis, and the first direction (X-axis direction) and the second direction (Y-axis direction) are directions perpendicular to the optical axis and are tilted by the second camera actuator. can A detailed description thereof will be given later.

In addition, in the description of the second camera actuator 1200 hereinafter, the optical axis direction is the third direction (Z axis direction) and will be described below based on this.

And with this configuration, the camera module according to the embodiment may improve the spatial limitation of the first camera actuator and the second camera actuator by changing the path of light. That is, the camera module according to the embodiment may extend the optical path while minimizing the thickness of the camera module in response to the change in the path of the light. Furthermore, it should be understood that the second camera actuator may provide a high range of magnification by controlling a focus or the like in the extended optical path.

In addition, the camera module according to the embodiment can implement OIS through the control of the optical path by the first camera actuator, thereby minimizing the occurrence of a decent or tilt phenomenon, and providing the best optical characteristics. can pay

Furthermore, the second camera actuator 1200 may include an optical system and a lens driver. For example, in the second camera actuator 1200, at least one of a first lens assembly, a second lens assembly, a third lens assembly, and a guide pin may be disposed.

In addition. The second camera actuator 1200 may include a coil and a magnet to perform a high-magnification zooming function.

For example, the first lens assembly and the second lens assembly may be a moving lens that moves through a coil, a magnet, and a guide pin, and the third lens assembly may be a fixed lens, but is not limited thereto. For example, the third lens assembly may perform a function of a concentrator to image light at a specific position, and the first lens assembly may re-image an image formed by the third lens assembly, which is a concentrator, to another location. It can perform the function of a variable (variator). Meanwhile, in the first lens assembly, the distance to the subject or the image distance is changed a lot, so the magnification change may be large, and the first lens assembly as the variable magnification may play an important role in changing the focal length or the magnification of the optical system. On the other hand, the image formed in the first lens assembly, which is a variable changer, may be slightly different depending on the location. Accordingly, the second lens assembly may perform a position compensation function for the image formed by the variable magnifier. For example, the second lens assembly may perform a compensator function that accurately forms an image formed by the first lens assembly, which is a variable changer, at an actual image sensor position. For example, the first lens assembly and the second lens assembly may be driven by electromagnetic force due to an interaction between a coil and a magnet. The above description may be applied to a lens assembly to be described later.

On the other hand, when the actuator for OIS and the actuator for AF or zoom are disposed according to an embodiment of the present invention, magnetic field interference with the magnet for AF or zoom can be prevented when OIS is driven. Since the first driving magnet of the first camera actuator 1100 is disposed separately from the second camera actuator 1200 , magnetic field interference between the first camera actuator 1100 and the second camera actuator 1200 can be prevented. In this specification, OIS may be used interchangeably with terms such as hand shake correction, optical image stabilization, optical image correction, and image stabilization.

4 is a perspective view of a first camera actuator according to the embodiment, and FIG. 5 is an exploded perspective view of the first camera actuator according to the embodiment.

4 and 5, the first camera actuator 1100 according to the embodiment includes a holder 1110, a bracket 1120, first and second driving units 1130 and 1140, a first substrate unit 1150, It may include a position sensor unit 1160 , a rotation unit 1170 , and an optical member 1180 .

First, the holder 1110 may be located outside the first camera actuator 1100 . And the holder 1110 supports the bracket 1120 , the first and second driving units 1130 and 1140 , the first substrate unit 1150 , the position sensor unit 1160 , the rotating unit 1170 , and the optical member 1180 . can

The bracket 1120 may be positioned on the holder 1110 . And the bracket 1120 may support the first driving unit 1130 . More specifically, the bracket 1120 may support the first link portion and the second link portion of the first and second driving units 1130 and 1140 .

In addition, the bracket 1120 may support an additional substrate seated thereon and a plurality of Hall sensors of the position sensor unit 1160 .

In addition, the bracket 1120 integrally supports the first driving unit and the second driving unit to improve reliability according to the movement and load of the link unit.

The first and second driving units 1130 and 1140 may tilt or yaw-tilt (or rotate) the rotating unit 1170 based on a yaw axis. Also, the first and second driving units 1130 and 1140 may tilt or pitch-tilt (or rotate) the rotating unit 1170 based on a pitch axis. In the present specification, the yaw (Yaw) direction corresponds to the first axis, and the yaw (Yaw) tilt is rotation about the yaw (Yaw) direction as a central axis. In addition, the pitch direction corresponds to the second axis, and the pitch tilt is rotation about the pitch direction as a central axis. And the yaw (Yaw) direction is one direction on the plane (XZ) in the longitudinal direction of the inclined rotating part, and the pitch (Pitch) direction is one direction on the plane (YZ) in the horizontal direction of the inclined rotating part.

In an embodiment, the first driving unit 1130 moves the positions of the first moving unit and the first moving unit through the first link unit moving in the third direction (Z-axis direction) to yaw and tilt the rotating unit 1170 . can do. Also, the second driving unit 1140 may pitch-tilt the rotating unit 1170 by moving the second moving unit and the second moving unit through the second link unit moving in the third direction (Z-axis direction).

The first substrate unit 1150 may be seated on the holder 1110 . In addition, the first substrate unit 1150 may be electrically connected to the first driving unit to change lengths in the third direction (Z-axis direction) of the first piezoelectric unit and the second piezoelectric unit by the first driving unit. In other words, an electrical signal (eg, voltage) input through the first substrate unit 1150 may extend the first piezoelectric unit and the second piezoelectric unit in the third direction (Z-axis direction).

In addition, the first board unit 1150 includes a circuit board having a wiring pattern that can be electrically connected, such as a rigid printed circuit board (Rigid PCB), a flexible printed circuit board (Flexible PCB), and a rigid flexible printed circuit board (RigidFlexible PCB). may include However, it is not limited to this type.

The position sensor unit 1160 may include a first Hall sensor, a second Hall sensor, a first magnet, and a second magnet. Any one of the first Hall sensor and the first magnet may be in contact with the first movable part. In addition, the other one of the first Hall sensor and the first magnet may be in contact with the bracket 1120 . Alternatively, the other of the first Hall sensor and the first magnet may be in contact with the additional substrate on the bracket 1120 . Hereinafter, the first magnet will be described on the basis of being in contact with the first movable part and the first Hall sensor being in contact with the bracket 1120 .

Accordingly, the first magnet in contact with the first movable part may move in response to the movement in the third direction (Z-axis direction) of the first movable part. In addition, the first Hall sensor may detect a change in magnetic force according to the movement of the first magnet.

Similarly, any one of the second Hall sensor and the second magnet may be in contact with the second movable part. In addition, the other one of the second Hall sensor and the second magnet may be in contact with the bracket 1120 . Alternatively, the other of the second Hall sensor and the second magnet may be in contact with the additional substrate on the bracket 1120 . Hereinafter, description will be made on the basis that the second magnet is in contact with the second movable part and the second Hall sensor is in contact with the bracket 1120 .

In addition, the second magnet in contact with the second movable part may move in response to the movement in the third direction (Z-axis direction) of the second movable part. In addition, the second Hall sensor may detect a change in magnetic force according to the movement of the second magnet.

The rotating part 1170 may be positioned on the holder 1110 and supported by the holder 1110 . In addition, the rotating unit 1170 may support the optical member 1180 . In other words, the rotation unit 1170 may seat the optical member 1180 .

In an embodiment, a portion of the rotation unit 1170 may be yaw-tilted by the first driving unit. In addition, a portion of the rotation unit 1170 may be pitch-tilted by the second driving unit. In response to the rotation (yaw/pitch tilt) of the rotation unit 1170 , the optical member 1180 may also be yaw or pitch tilted.

The rotation unit 1170 may yaw and tilt by the pressure and coupling force of the first driving unit, and may tilt by the pressure and coupling force of the second driving unit (Pitch).

The optical member 1180 may include a reflective member such as a prism or a mirror. The optical member 1180 may further include at least one lens in front or behind the reflective member.

In addition, as described above, since the optical member 1180 performs a yaw tilt or a pitch tilt in response to the rotation of the rotating unit 1170 , as described above, the optical member 1180 moves in a direction perpendicular to the optical axis (Z-axis direction). Path changes may be made. Accordingly, the first camera actuator according to the embodiment may perform image stabilization (OIS).

6 is a perspective view of a holder of a first camera actuator according to an embodiment.

Referring to FIG. 6 , the holder 1110 of the first camera actuator according to the embodiment may be located outside the first camera actuator.

In an embodiment, the holder 1110 may include a side wall part 1111 , a first lower part 1112 , a second lower part 1113 , and a rotation support part 1114 .

The side wall part 1111 may be located on one side of the holder 1110 . The sidewall part 1111 may be in contact with the first substrate part.

The first lower portion 1112 may be in vertical contact with the sidewall portion 1111 . The first lower portion 1112 may be formed integrally with the side wall portion 1111 .

The first lower portion 1112 may be located at the lowermost side of the first camera actuator. In addition, the first lower part 1112 may support the first substrate part.

The second lower portion 1113 may be in contact with the first lower portion 1112 . The second lower portion 1113 may extend in the third direction (Z-axis direction) from the first lower portion 1112 . In this case, the second lower part 1113 and the first lower part 1112 may be integrally formed. A rotating part 1170 may be positioned on the second lower part 1113 .

The rotation support part 1114 may be in contact with the second lower part 1113 . The rotation support part 1114 may be in contact with the side surface of the second lower part 1113 and may extend in the first direction (X-axis direction).

Also, the rotation support 1114 may have an inclined surface 1114a inclined with respect to the plane YZ. The inclined surface 1114a may have a first inclination θa with respect to the plane YZ.

And the rotating part may be seated on the inclined surface 1114a. Accordingly, the rotation unit may also have a first inclination θa with respect to the plane YZ.

That is, the rotation support unit 1114 may support the rotation unit to be inclined at a predetermined angle (eg, a first inclination) while supporting the rotation unit. Accordingly, light incident through the upper portion may be reflected by the inclined optical member. Accordingly, the first camera actuator according to the embodiment may simultaneously change the optical path to minimize the thickness (eg, the length in the first direction) and improve the optical performance by improving the degree of freedom of the lens on the optical path.

7 is a perspective view of a bracket of a first camera actuator according to an embodiment.

Referring to FIG. 7 , the bracket 1120 of the first camera actuator may include a bracket support 1121 , a first protrusion 1122 , a second protrusion 1123 , and a third protrusion 1124 .

The bracket support 1121 may be located under the bracket 1120 . The bracket support 1121 may be located on the first lower portion and the second lower portion of the holder 1110 described above. Accordingly, the bracket support 1121 may overlap the first lower portion and the second lower portion in the first direction (X-axis direction).

The first protrusion 1122 , the second protrusion 1123 , and the third protrusion 1124 may be positioned at edges of the bracket support 1121 .

The first protrusion 1122 may be positioned on the upper surface of the bracket support 1121 and extend in the first direction (X-axis direction). The first protrusion 1122 may be formed perpendicular to the bracket support 1121 .

The first protrusion 1122 may be positioned adjacent to an edge of the bracket support 1121 . Specifically, the first protrusion 1122 may be located adjacent to one surface facing in the second direction (Y-axis direction).

In addition, the first protrusion 1122 may include a first hole 1122a. The first hole 1122a may be located above the first protrusion 1122 . The second link unit may be seated in the first hole 1122a.

The second protrusion 1123 may be positioned on the upper surface of the bracket support 1121 and extend in the first direction (X-axis direction). The second protrusion 1123 may be formed perpendicular to the bracket support 1121 .

The second protrusion 1123 may be located adjacent to the edge of the bracket support 1121 . Specifically, the second protrusion 1123 may be located adjacent to the other surface adjacent to the surface facing in the second direction (Y-axis direction). In an embodiment, the second protrusion 1123 may be positioned symmetrically with the first protrusion 1122 in the first direction (X-axis direction) and the third direction (Z-axis direction).

The second protrusion 1123 may include a second hole 1123a. The second hole 1123a may be located above the second protrusion 1123 . The first link unit may be seated in the second hole 1123a.

Also, the second hole 1123a may be positioned to correspond to the fourth hole 1123b of the third protrusion. For example, the second hole 1123a may be symmetrically disposed with the fourth hole 1123b in the first direction (X-axis direction). Accordingly, the first link unit may pass through the second hole 1123a and the fourth hole 1123b. In addition, the first link part is supported by the second hole 1123a and the fourth hole 1123b, and when the first link part moves in the third direction (Z-axis direction), a frictional force may be applied to the first link part. .

The third protrusion 1124 may be positioned adjacent to an edge of the bracket support 1121 . Specifically, the third protrusion 1124 may be positioned to face the first protrusion 1122 and the second protrusion 1123 . The third protrusion 1124 may be positioned to correspond to the first protrusion 1122 in the first direction (X-axis direction). Also, the third protrusion 1124 may be positioned to correspond to the second protrusion 1123 in the first direction (X-axis direction).

The third protrusion 1124 may include a third hole 1124a and a fourth hole 1124b. The third hole 1124a and the fourth hole 1124b may be located above the third protrusion 1124 .

In addition, the third hole 1124a may be positioned to correspond to the first hole 1122a. Also, the fourth hole 1124b may be positioned to correspond to the second hole 1123b. In an embodiment, the third hole 1124a may be positioned to face the first hole 1122a in the first direction (X-axis direction). Also, the fourth hole 1124b may be positioned to face the second hole 1123b in the first direction (X-axis direction). Accordingly, the second link part may pass through the first hole 1122a and the third hole 1124a and may be supported by the first protrusion part 1122 and the third protrusion part 1124 . Also, the first link part may pass through the second hole 1123a and the fourth hole 1124b and may be supported by the second protrusion 1123 and the third protrusion 1124 .

Also, the length of the third protrusion 1124 in the second direction (Y-axis direction) may be greater than the length of the first protrusion 1122 or the second protrusion 1123 in the second direction (Y-axis direction). Also, the first protrusion 1122 and the second protrusion 1123 may be spaced apart from each other. With this configuration, the support force for the first link portion and the second link portion by the third protrusion 1124 may be improved. In addition, by providing a separation space between the first protrusion 1122 and the second protrusion 1123 , an arrangement space of the first driving unit may be easily secured.

In addition, the first protrusion 1122 , the second protrusion 1123 , and the third protrusion 1124 may be integrally formed with the bracket support 1121 .

8A is a perspective view of a first driving unit of a first camera actuator according to an embodiment, FIG. 8B is an exploded perspective view of a first driving unit of a first camera actuator according to an embodiment, and FIG. 8C is a first camera actuator according to the embodiment It is a side view of the 1st movable part.

8A to 8B , the first driving unit 1130 of the first camera actuator includes a first piezoelectric unit 1131 , a first link unit 1132 , a first moving unit 1133 , and a first movable unit 1134 . ) and a first suction unit 1135 .

The first piezoelectric part 1131 may be formed of a piezoelectric element. In an embodiment, the first piezoelectric part 1131 may include a piezoelectric element made of a ceramic material.

In an embodiment, the first piezoelectric part 1131 may have an electric field formed due to voltage application and may change in length. More specifically, the first piezoelectric part 1131 may be formed of a crystal lattice in which positive and negative ions are elastically connected. Accordingly, in the first piezoelectric part 1131 , 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 first piezoelectric part 1131 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. At this time, when an electric field is applied to the first piezoelectric part 1131 , the polarization direction of the inside of the crystal is polarized according to the electric field direction, and the length of the crystal grains can 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 first piezoelectric unit 1131 may operate in an elongated state in which each crystal is stretched or a reduced state in which crystals are reduced according to a voltage. In other words, when an electrical signal such as a voltage is applied, the first piezoelectric part 1131 may perform mechanical deformation (contraction and contraction in the third direction (Z-axis direction)). With this configuration, the first camera actuator according to the embodiment has no electromagnetic interference and has little influence on the shape, thereby providing high reliability and improved energy efficiency.

The first link unit 1132 may be connected to the first piezoelectric unit 1131 . Accordingly, the first link part 1132 may move in the third direction (Z-axis direction) in response to the expansion and contraction of the first piezoelectric part 1131 .

The first link unit 1132 may be in the form of a shaft. In addition, the first link unit 1132 may pass through the second hole and the fourth hole as described above. Accordingly, the first link unit 1132 may be supported by the bracket 1120 .

The first moving unit 1133 may be connected to the first link unit 1132 . The first moving unit 1133 may cover the first link unit 1132 . Furthermore, the first moving part 1133 may be in contact with the first movable part 1134 . In an embodiment, one side of the first moving unit 1133 may be in contact with the first link unit 1132 , and the other side may be in contact with the first movable unit 1134 .

With this configuration, the first moving unit 1133 may move in the third direction (Z-axis direction) in response to the movement of the first link unit 1132 . However, the first moving unit 1133 may have a predetermined frictional force with the first link unit 1132 . For example, the first moving unit 1133 may not move in the third direction (Z-axis direction) due to the inertial force when the first link unit 1132 moves at a predetermined speed or more. That is, the position of the first moving unit 1133 may be changed relative to the first link unit 1132 . In other words, the position of the first moving unit 1133 may be changed with respect to the first link unit 1132 .

Contrary to this, the first moving unit 1133 may not move in the third direction (Z-axis direction) when the first link unit 1132 moves at a speed lower than a predetermined speed. That is, the position of the first moving unit 1133 may be relatively maintained with respect to the first link unit 1132 .

The first moving unit 1133 may include a coupling hole at the other side. This coupling hole may be in contact with the first movable part 1134 . A bonding member may be applied to the coupling hole. Accordingly, the first movable part 1134 and the first movable part 1133 may be coupled to each other.

The first movable part 1134 may include a first movable support part 1134a , a first movable extension part 1134b , a first seating part 1134c , and a first pressing part 1134d .

The first movable support part 1134a may be spaced apart from the first link part 1132 . In addition, the first movable support part 1134a may at least partially contact the first movable part 1133 . For example, the first movable support part 1134a may at least partially overlap the first movable part 1133 in the first direction (X-axis direction). For example, the bottom surface 1134as of the first movable support part 1134a may be coupled to the first movable part 1133 .

The first movable extension 1134b may be connected to the first movable support 1134a. The first movable extension portion 1134b may extend from a lower portion of the first movable support portion 1134a toward the first link portion 1132 . That is, the first movable extension part 1134b may be positioned between the first link part 1132 and the first movable support part 1134a.

The first seating part 1134c may be connected to the first movable support part 1134a, and an upper surface thereof may be inclined at a second inclination θb with respect to the plane ZY. The first suction part 1135 may be seated on the first seating part 1134c.

In an embodiment, the first seating part 1134c may include a first seating groove 1134h. The first seating groove 1134h may also be inclined at a second inclination θb with respect to the plane ZY. The second slope θb may correspond to the first slope. With this configuration, the suction force by the rotating part and the first suction part is uniformly provided, so that the yaw tilt can be accurately performed.

The first pressing part 1134d may be positioned adjacent to the first seating part 1134c. Also, the first pressing part 1134d may be in contact with the first seating part 1134c. The first pressing part 1134d may be positioned between the first seating part 1134c and the rotating part. Accordingly, the first pressing part 1134d may be located adjacent to the rotating part compared to the first seating part 1134c. With this configuration, the first pressing unit 1134d may press the rotating unit to yaw tilt. The first pressing part 1134d may have a first contact surface 1134ds in contact with the rotating part. The first contact surface 1134ds may also be inclined at a third inclination θc with respect to the plane ZY. The third slope θc may correspond to the second slope θb. With this configuration, since the first pressing unit uniformly presses the rotating part, the yaw tilt can be accurately performed.

Furthermore, the first seating part 1134c may be sucked so that the rotating part yaw-tilts through the first suction part 1135 . In other words, a yaw tilt may be performed by pressing the rotating part while the first pressing part 1134d moves in the third direction (Z-axis direction). In addition, even if the first pressing unit 1134d moves in the opposite direction to the third direction (Z-axis direction), the rotating unit maintains contact with the first pressing unit 1134d by the first suction unit 1135, so the yaw (Yaw) ) tilt can be performed.

The first suction part 1135 may be seated in the first seating groove 1134h. The first suction unit 1135 may be formed of a magnetic material. For example, the first suction unit 1135 may be a magnet, and may form an attractive force with a rotating unit made of a metal material. Accordingly, even if the first pressing part 1134d moves in the third direction (Z-axis direction), the contact between the rotating part and the first pressing part 1134d is maintained by the first suction part 1135, so that the yaw ( Yaw) tilt can be performed.

9A is a perspective view of a second driving unit of a first camera actuator according to an embodiment, FIG. 9B is an exploded perspective view of a second driving unit of a first camera actuator according to an embodiment, and FIG. 9C is a first camera actuator according to the embodiment is a perspective view of the first movable part of , and FIG. 9D is a side view of the first movable part of the first camera actuator according to the embodiment.

9A to 9D , the second driving unit 1140 of the second camera actuator includes a second piezoelectric unit 1141 , a second link unit 1142 , a second moving unit 1143 , and a second movable unit 1144 . ) and a second suction unit 1145 .

The second piezoelectric part 1141 may be formed of a piezoelectric element like the first piezoelectric part 1131 . In an embodiment, the second piezoelectric part 1141 may include a piezoelectric element made of a ceramic material.

In addition, the second piezoelectric part 1141 may have an electric field formed due to voltage application and may change in length. As described above, the second piezoelectric unit 1141 may operate in an elongated state in which each crystal is stretched or a reduced state in which crystals are reduced according to a voltage. In other words, the second piezoelectric part 1141 may expand and contract in the third direction (Z-axis direction). 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 second link unit 1142 may be connected to the second piezoelectric unit 1141 . Accordingly, the second link unit 1142 may move in the third direction (Z-axis direction) in response to the expansion/contraction of the second piezoelectric unit 1141 .

The second link unit 1142 may be in the form of a shaft. In addition, the second link unit 1142 may pass through the first hole and the third hole as described above. Accordingly, the second link unit 1142 may be supported by the bracket 1120 . In order to form a predetermined frictional force and coupling force between the first and second link parts 1142 and the first to fourth holes of the bracket 1120, a coupling member having frictional force is provided in the first to fourth holes. can be located

The second moving unit 1143 may be connected to the second link unit 1142 . The second moving unit 1143 may be positioned to surround the second link unit 1142 . Furthermore, the second moving part 1143 may be in contact with the second movable part 1144 . In an embodiment, one side of the second moving unit 1143 may be in contact with the second link unit 1142 , and the other side may be in contact with the second movable unit 1144 .

With this configuration, the second moving unit 1143 may move in the third direction (Z-axis direction) in response to the movement of the second link unit 1142 . However, the second moving unit 1143 may have a predetermined frictional force with the second link unit 1142 . For example, the second moving unit 1143 may not move in the third direction (Z-axis direction) due to the inertial force when the second link unit 1142 moves at a predetermined speed or more. That is, the position of the second moving unit 1143 may be changed relative to the second link unit 1142 . In other words, the position of the second moving unit 1143 may be changed with respect to the second link unit 1142 .

Contrary to this, the second moving unit 1143 may not move in the third direction (Z-axis direction) when the second link unit 1142 moves at a speed lower than a predetermined speed. That is, the position of the second moving unit 1143 may be relatively maintained with respect to the second link unit 1142 .

The second moving unit 1143 may include a coupling hole at the other side. This coupling hole may be in contact with the second movable part 1144 . A bonding member may be applied to the coupling hole. Accordingly, the second movable part 1144 and the second movable part 1143 may be coupled to each other.

The second movable part 1144 may include a second movable support part 1144a, a second movable extension part 1144b, a second seating part 1144c, and a second pressing part 1144d.

The second movable support part 1144a may be spaced apart from the second link part 1142 . In addition, the second movable support part 1144a may at least partially contact the second movable part 1143 . For example, the second movable support part 1144a may at least partially overlap the second movable part 1143 in the second direction (X-axis direction). For example, the bottom surface 1144as of the second movable support part 1144a may be coupled to the second movable part 1143 .

The second movable extension 1144b may be connected to the second movable support 1144a. The second movable extension portion 1144b may extend from a lower portion of the second movable support portion 1144a toward the first link portion 1132 . Alternatively, the second movable extension part 1144b may extend from a lower portion of the second movable support part 1144a toward the 1-1 driving part. That is, the second movable extension part 1144b may be positioned between the first link part 1132 and the second movable support part 1144a. Accordingly, by arranging both the first movable part and the second movable part in a predetermined space, it is possible to reduce the device size of the camera actuator.

The second seating part 1144c may be connected to the second movable support part 1144a, and an upper surface thereof may be inclined at a fourth inclination θd with respect to the plane ZY. The second suction part 1145 may be seated on the second seating part 1144c.

In an embodiment, the second seating portion 1144c may include a second seating groove 1144h. The second seating groove 1144h may also be inclined at a fourth inclination θd with respect to the plane ZY. The fourth inclination θd may correspond to the first inclination or the angle at which the rotating part is inclined with respect to the plane ZY. With this configuration, the suction force by the rotating unit and the second suction unit is uniformly provided, so that the pitch tilt can be performed accurately.

The second pressing part 1144d may be located adjacent to the second seating part 1144c. Also, the second pressing part 1144d may be in contact with the second seating part 1144c. The second pressing part 1144d may be positioned between the second seating part 1144c and the rotating part. Accordingly, the second pressing part 1144d may be located adjacent to the rotating part compared to the second seating part 1144c. With this configuration, the second pressing unit 1144d may press the rotating unit to tilt the pitch. The second pressing part 1144d may have a second contact surface 1144ds in contact with the rotating part. The second contact surface 1144ds may also be inclined at a fifth inclination θe with respect to the plane ZY. The fifth slope θe may correspond to the fourth slope θd. With this configuration, since the second pressing unit uniformly presses the rotating part, pitch tilt can be performed accurately.

Furthermore, the second seating part 1144c may suck the rotating part through the second suction part 1145 to tilt the pitch. In other words, a pitch tilt may be performed by pressing the rotating part while the second pressing part 1144d moves in the third direction (Z-axis direction). In addition, even if the second pressing part 1144d moves in the opposite direction to the third direction (Z-axis direction), the rotating part maintains contact with the second pressing part 1144d by the second suction part 1145, so the pitch (Pitch) ) tilt can be performed.

The second suction part 1145 may be seated in the second seating groove 1144h. The second suction unit 1145 may be formed of a magnetic material. For example, the second suction unit 1145 may be a magnet, and may form an attractive force with a rotating unit made of a metal material. Accordingly, even if the second pressing unit 1144d moves in the third direction (Z-axis direction), the contact between the rotating unit and the second pressing unit 1144d is maintained by the second suction unit 1145 and the pitch of the rotating unit is maintained ( pitch) tilt may be performed.

10 is a perspective view of a first substrate unit and a position sensor unit of a first camera actuator according to an exemplary embodiment;

Referring to FIG. 10 , the first camera actuator according to the embodiment may include a first substrate unit 1150 and a position sensor unit 1160 .

As described above, the first substrate unit 1150 may be seated on the holder 1110 . In addition, the first substrate unit 1150 may be electrically connected to the first driving unit to change lengths in the third direction (Z-axis direction) of the first piezoelectric unit and the second piezoelectric unit by the first driving unit. In other words, an electrical signal (eg, voltage) input through the first substrate unit 1150 may extend the first piezoelectric unit and the second piezoelectric unit in the third direction (Z-axis direction).

In addition, the first board unit 1150 includes a circuit board having a wiring pattern that can be electrically connected, such as a rigid printed circuit board (Rigid PCB), a flexible printed circuit board (Flexible PCB), and a rigid flexible printed circuit board (RigidFlexible PCB). may include However, it is not limited to this type.

The position sensor unit 1160 may include a first Hall sensor 1161b , a second Hall sensor 1162b , a first magnet 1161a , and a second magnet 1162a .

In an embodiment, the first magnet 1161a may be coupled to the first movable part. More specifically, the first magnet 1161a may be located on the bottom surface 1134as of the first movable support part 1134a of the first movable part. And the second magnet 1162a may be coupled to the second movable part. More specifically, the second magnet 1162a may be located on the bottom surface 1144as of the second movable support part 1144a of the second movable part.

In addition, the first Hall sensor 1161b and the second Hall sensor 1162b may be connected to the bracket 1120 or an additional substrate on the bracket.

Accordingly, the first magnet 1161a may move in response to the movement in the third direction (Z-axis direction) of the first movable part. In addition, the first Hall sensor 1161b may detect a change in magnetic force according to the movement of the first magnet 1161a.

In addition, the second magnet 1162a in contact with the second movable part may move in response to the movement in the third direction (Z-axis direction) of the second movable part. In addition, the second Hall sensor 1162b may detect a change in magnetic force according to the movement of the second magnet 1162a.

The first magnet 1161a and the second magnet 11262a are in contact with the bottom surface 1144as of the first movable support part 1134a and the bottom surface 1134as and the second movable support part 1144a, respectively, so as to be in contact with the above-described predetermined angle. can be tilted

11 is a perspective view of a rotating part and an optical member of a first camera actuator according to an embodiment, FIG. 12 is a perspective view of a rotating part of a first camera actuator according to an embodiment, and FIG. 13 is a rotating part of the first camera actuator according to the embodiment is a front view of

11 to 13 , the optical member 1180 may be seated on the rotating unit 1170 . As described above, the optical member 1180 may include a reflective member such as a prism or a mirror. Also, the optical member 1180 may further include at least one lens in front or behind the reflective member.

In an embodiment, the rotation unit 1170 may include a first rotation plate 1171 , a second rotation plate 1172 , a fixed plate 1173 , a first bridge BR1 , and a second bridge BR2 .

The first rotation plate 1171 may be located at the innermost side of the rotation unit 1170 . The first rotation plate 1171 may support the optical member 1180 . The area of the first rotation plate 1171 may be equal to or greater than that of the optical member 1180 . With this configuration, the optical member 1180 may also easily rotate in response to the rotation of the first rotation plate.

The second rotation plate 1172 may be located outside the first rotation plate 1171 . The second rotation plate 1172 may have an open inner side, and the first rotation plate 1171 may be positioned inside the second rotation plate 1172 . For example, the second rotation plate 1172 may be in the form of a closed loop or an open loop.

The second rotation plate 1172 may cover the first rotation plate 1171 . The second rotation plate 1172 may rotate independently of or dependent on the first rotation plate 1172 . For example, only the first rotation plate 1171 may rotate (eg, yaw tilt). Alternatively, both the first rotation plate 1171 and the second rotation plate 1172 may rotate (eg, pitch tilt).

The first bridge BR1 may be positioned between the first rotation plate 1171 and the second rotation plate 1172 . The first bridge BR1 may include a 1-1 bridge BR1a and a 1-2 th bridge BR1b. The 1-1 bridge BR1a may be located on the upper portion. And the 1-2-th bridge BR1b may be located in the lower part.

The 1-1 bridge BR1a and the 1-2 th bridge BR1b may be positioned at a point bisected in the pitch direction between the first rotation plate 1171 and the second rotation plate 1172 . As described above, the yaw direction may be defined in one direction in the plane XZ and when the rotating part is made a plane. And, as described above, the pitch direction may be defined in one direction in the plane YZ and when the rotating part is made a plane.

Also, the 1-1 bridge BR1a and the 1-2 th bridge BR1b may overlap in the yaw direction. With this configuration, rotation (yaw tilt) of the inner first rotation plate 1171 with respect to the 1-1 bridge BR1a and the 1-2 bridge BR1b may be accurately performed.

The fixing plate 1173 may be located at the outermost side of the rotating part 1170 . The fixing plate 1173 may be positioned on the inclined surface 1114a of the rotation support 1114 . Accordingly, the fixing plate 1173 may be supported by the rotation support 1114 and may not rotate.

The fixing plate 1173 may be coupled to the first rotation plate 1171 and the second rotation plate 1172 from the outside through the second rotation plate 1172 and the second bridge BR2 .

The second bridge BR2 may include a 2-1 th bridge BR2a and a 2-2 th bridge BR2b. The second-first bridge BR2a and the second-second bridge BR2b may overlap in the pitch direction. With this configuration, the rotation (pitch tilt) of the inner first rotation plate 1171 and the second rotation plate 1172 on the basis of the 2-1 bridge BR2a and the 2-2 bridge BR2b is accurately performed. can be done

The second-first bridge BR2a and the second-second bridge BR2b may be positioned in parallel with the first virtual line CV1 that bisects the rotation part in the pitch direction.

Also, the 1-1 bridge BR1a and the 1-2 bridge BR1b may be positioned in parallel with the second virtual line CV2 that bisects the rotating part in the yaw direction.

In addition, the first virtual line CV1 may be parallel to the pitch direction, and the second virtual line CV2 may be parallel to the yaw direction.

In an embodiment, the first rotation plate 1171 may be yaw-tilted by the driving of the above-described first driving unit. In this case, the contact points CP1 and CP2 of the first rotation plate 1171 and the first driving unit may be located at an edge of the first rotation plate 1171 . By this configuration, it is possible to easily perform the yaw tilt even with a small voltage. That is, the first camera actuator may provide improved power efficiency.

The contact points CP1 and CP2 of the first rotation plate 1171 may be points/points or regions. For example, in the case of a point (eg, the first point CP1 ), it may be located on the first imaginary line CV1 or on a bisector in the longitudinal direction of the first rotation plate 1171 . In addition, in the case of a region (eg, the first region CP2 ), it may be symmetrically positioned on the first virtual line CV1 . By this configuration, the rotation of the rotating part according to the pressure and suction force is not concentrated on one side, and the yaw tilt of the rotating part can be performed accurately.

Also, the second rotation plate 1172 may be pitch-tilted together with the first rotation plate 1171 by driving the second driving unit. In this case, the contact points CP3 and CP4 of the second rotation plate 1172 and the second driving unit may be located at an edge of the second rotation plate 1172 . With this configuration, pitch tilt can be easily performed.

The contact points CP3 and CP4 of the second rotation plate 1172 may be points/points or regions. For example, in the case of a point (eg, the second point CP3 ), it may be located on the second imaginary line CV2 or on a bisector in the longitudinal direction of the second rotation plate 1172 . In addition, in the case of the region (eg, the second region CP4 ), it may be symmetrically positioned on the second virtual line CV2 . With this configuration, the rotation of the rotating unit according to the pressure and suction force is not concentrated on one side, and the pitch tilt of the rotating unit can be performed accurately.

14 is an upper perspective view of the first camera actuator according to the embodiment, and FIG. 15 is a front view of the first camera actuator in which the rotating part and the optical member are removed.

14 and 15 , in the first camera actuator according to the embodiment, the first rotation plate 1171 of the rotation unit 1170 may be yaw-tilted by the first driving unit 1130 . At this time, in the first driving unit 1130 , the first link unit, the first connection unit, the first movable unit, and the first suction unit may move in a third direction (Z-axis direction). The first link part, the first connection part, the first movable part, and the first suction part may be stretched and contracted in a third direction (Z-axis direction).

For example, the first link part, the first connection part, and the first movable part may move in the third direction (Z-axis direction) (F1a) to press the rotating part (F1b). In addition, the first link part, the first connection part, and the first movable part may maintain contact with the rotating part by the suction force of the first suction part (F1c) while moving in a direction opposite to the third direction (Z-axis direction). Alternatively, a predetermined distance between the first suction unit and the rotating unit may be maintained.

In the first camera actuator according to the embodiment, the second rotation plate 1172 and the first rotation plate 1171 of the rotation unit 1170 may be pitch-tilted by the second driving unit 1140 . At this time, in the second driving unit 1140 , the second link unit, the second connection unit, the second movable unit, and the second suction unit may move in the third direction (Z-axis direction) (F2a). The second link part, the second connection part, the second movable part, and the second suction part may be stretched and contracted in a third direction (Z-axis direction).

For example, the second link part, the second connection part, and the second movable part may move in the third direction (Z-axis direction) to press the rotating part. In addition, the second link part, the second connection part, and the second movable part may maintain contact with the rotating part by the suction force of the second suction part (F2c) while moving in a direction opposite to the third direction (Z-axis direction). Alternatively, a predetermined distance may be maintained.

In addition, the first Hall sensor 1161b may be located under the first magnet 1161a. When there is no movement, the first Hall sensor 1161b may be positioned to overlap the first magnet 1161a in the first direction (X-axis direction).

In addition, the second Hall sensor 1162b may be located under the second magnet 1162a. Similarly, when there is no movement, the second Hall sensor 1162b may be positioned to overlap the second magnet 1162a in the first direction (X-axis direction).

With this configuration, the first camera actuator according to the embodiment may accurately detect the positional movement of the first movable part and the second movable part.

16A and 16B are views for explaining the advance by the first driving unit of the first camera actuator according to the embodiment, and FIGS. 17A and 17B are views for explaining the backward movement by the first driving unit of the first camera actuator according to the embodiment. is a drawing that

The piezoelectric part (corresponding to the first and second piezoelectric parts) 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. 16b) and shrink when the voltage decreases (F1ab, FIG. 17b).

16A and 16B , the expansion and contraction of the piezoelectric part is controlled according to the first driving signal PS1, and the moving part (corresponding to the first and second moving parts) is the link part (corresponding to the first and second link parts). location may change.

For example, when a voltage is applied for a predetermined time (t0 to t1) and the pressing unit and the link unit extend below a predetermined speed, the moving unit may have the same position in the link unit. That is, the distance between the moving part and the pressing part may be maintained (d1).

However, when the voltage is applied for a predetermined time (t1 to t2) and the pressing unit and the link unit are reduced at a speed greater than a predetermined speed, the position of the moving unit may be changed in the link unit. 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 part. Hereinafter, when a + voltage is applied to the piezoelectric part, the length of the piezoelectric part is extended in the third direction (Z-axis direction), and when a - voltage is applied to the piezoelectric part, the length of the piezoelectric part is reduced in the third direction (Z-axis direction).

Accordingly, the position of the moving part is maintained by inertia, so that the relative position of the link part may be the same as the extension direction. That is, the distance between the moving part and the pressing part may increase (increase from d1 to d2). That is, finally, even though the length of the piezoelectric part is the same by the application of the first driving signal PS1 , the position between the piezoelectric part and the moving part increases, so that the movable part and the suction part may move in the third 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 unit 100 times per second. Accordingly, the first driving signal of one cycle may move the first moving unit in the third direction to press the rotating unit and perform yaw tilt.

17A and 17B , the expansion and contraction of the piezoelectric part is adjusted according to the second driving signal PS1', and the moving part (corresponding to the first and second moving parts) corresponds to the link part (corresponding to the first and second link parts). ) may change location.

For example, when a voltage is applied for a predetermined time (t0' to t1') and the pressing unit and the link unit are reduced below a predetermined speed, the moving unit may have the same position in the link unit. That is, the distance between the moving part and the pressing part may be maintained (d3).

However, when the voltage is applied for a predetermined time (t1' to t2') and the pressing unit and the link unit are extended at a speed greater than a predetermined speed, the position of the moving unit may be changed in the link unit. 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 part as described above.

Accordingly, the position of the moving part is maintained by inertia, so that the relative position of the link part may be the same as the extension direction. That is, the distance between the moving part and the pressing part may be reduced (decreased from d3 to d4). That is, finally, even though the length of the piezoelectric part is the same by the application of the second driving signal PS1', the position between the piezoelectric part and the moving part is decreased, so that the movable part and the suction part may move in the opposite direction to the third direction.

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. Accordingly, the second driving signal of one cycle may move the first moving unit in the third direction to press the rotating unit and perform yaw tilt.

18 is a perspective view of a second camera actuator according to the embodiment, FIG. 19 is an exploded perspective view of the second camera actuator according to the embodiment, FIG. 20 is a cross-sectional view taken along line DD′ in FIG. 18, and FIG. 21 is FIG. 18 It is a cross-sectional view cut from EE'.

18 to 21 , the second camera actuator 1200 according to the embodiment includes a lens unit 1220 , a second housing 1230 , a third driving unit 1250 , a base unit (not shown), and a second camera actuator 1200 . Two substrate units 1270 may be included. Furthermore, 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 IS.

The second shield can (not shown) is located in an area (eg, the outermost side) of the second camera actuator 1200 and includes components (the lens unit 1220 , the second housing 1230 , and the elastic unit to be described later). (not shown), the third driving unit 1250, the base unit (not shown), the second substrate unit 1270, and the image sensor IS).

The second shield can (not shown) may block or reduce electromagnetic waves generated from the outside. Accordingly, the occurrence of a malfunction in the third driving unit 1250 may be reduced.

The lens unit 1220 may be located in a second shield can (not shown). The lens unit 1220 may move in a third direction (Z-axis direction). Accordingly, the above-described AF function may be performed.

Specifically, the lens unit 1220 may include a lens assembly 1221 and a bobbin 1222 .

The lens assembly 1221 may include at least one lens. In addition, there may be a plurality of lens assemblies 1221 , but hereinafter, one lens assembly will be used as a reference.

The lens assembly 1221 is coupled to the bobbin 1222 to move in the third direction (Z-axis direction) by electromagnetic force generated from the third magnet 1252a and the second magnet 1252b coupled to the bobbin 1222 . .

The bobbin 1222 may include an opening area surrounding the lens assembly 1221 . In addition, the bobbin 1222 may be coupled to the lens assembly 1221 by various methods. Also, the bobbin 1222 may include a groove in the side thereof, and may be coupled to the third magnet 1252a and the second magnet 1252b through the groove. A bonding member or the like may be applied to the groove.

In addition, the bobbin 1222 may be coupled to an elastic part (not shown) at the upper end and the rear end. Accordingly, the bobbin 1222 may be supported by an elastic part (not shown) to move in the third direction (Z-axis direction). That is, the position of the bobbin 1222 may be maintained while being maintained in the third direction (Z-axis direction). The elastic part (not shown) may be formed of a leaf spring.

The second housing 1230 may be disposed between the lens unit 1220 and the second shield can (not shown). In addition, the second housing 1230 may be disposed to surround the lens unit 1220 .

A hole may be formed in a side of the second housing 1230 . A third coil 1251a and a fourth coil 1251b may be disposed in the hole. The hole may be positioned to correspond to the groove of the bobbin 1222 described above.

The third magnet 1252a may be positioned to face the third coil 1251a. Also, the second magnet 1252b may be positioned to face the fourth coil 1251b.

The elastic part (not shown) may include a first elastic member (not shown) and a second elastic member (not shown). The first elastic member (not shown) may be coupled to the upper surface of the bobbin 1222 . The second elastic member (not shown) may be coupled to the lower surface of the bobbin 1222 . In addition, the first elastic member (not shown) and the second elastic member (not shown) may be formed of a leaf spring as described above. In addition, the first elastic member (not shown) and the second elastic member (not shown) may provide elasticity with respect to the movement of the bobbin 1222 .

The third driving unit 1250 may provide driving forces F3 and F4 for moving the lens unit 1220 in the third direction (Z-axis direction). The third driving unit 1250 may include a driving coil 1251 and a driving magnet 1252 .

The lens unit 1220 may move in the third direction (Z-axis direction) by the electromagnetic force formed between the driving coil 1251 and the driving magnet 1252 .

The driving coil 1251 may include a third coil 1251a and a fourth coil 1251b. The third coil 1251a and the fourth coil 1251b may be disposed in a hole formed in the side of the second housing 1230 . In addition, the third coil 1251a and the fourth coil 1251b may be electrically connected to the second substrate unit 1270 . Accordingly, the third coil 1251a and the fourth coil 1251b may receive current or the like through the second substrate unit 1270 .

The driving magnet 1252 may include a third magnet 1252a and a fourth magnet 1252b. The third magnet 1252a and the fourth magnet 1252b may be disposed in the aforementioned groove of the bobbin 1222 and may be positioned to correspond to the third coil 1251a and the fourth coil 1251b.

The base unit (not shown) may be positioned between the lens unit 1220 and the image sensor IS. A component such as a filter may be fixed to the base portion (not shown). Also, the base part (not shown) may be disposed to surround the image sensor IS. With this configuration, since the image sensor IS is free from foreign substances, the reliability of the device may be improved.

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

And the second camera actuator may be a fixed zoom or a continuous zoom. For example, the second camera actuator may provide movement of the lens assembly 1221 .

In addition, the second camera actuator may be formed of a plurality of lens assemblies. For example, the second camera actuator may include at least one of a first lens assembly (not shown), a second lens assembly (not shown), a third lens assembly (not shown), and a guide pin (not shown). can be placed. In this regard, the above description may be applied. Accordingly, the second camera actuator may perform a high-magnification zooming function through the driving unit. For example, the first lens assembly (not shown) and the second lens assembly (not shown) may be a moving lens that moves through a driving unit and a guide pin (not shown), and the third lens The assembly (not shown) may be a fixed lens, but is not limited thereto. For example, the third lens assembly (not shown) may perform a function of a concentrator to image light at a specific location, and the first lens assembly (not shown) may serve as a concentrator. (not shown) may perform a variator function to reimage the image formed in another place. Meanwhile, in the first lens assembly (not shown), the magnification change may be large because the distance or image distance from the subject is changed a lot, and the first lens assembly (not shown), which is the variable magnification, may have a focal length or magnification change of the optical system. can play an important role in On the other hand, the image formed in the first lens assembly (not shown), which is a variable changer, may be slightly different depending on the location. Accordingly, the second lens assembly (not shown) may perform a position compensation function for the image formed by the variable changer. For example, the second lens assembly (not shown) functions as a compensator to accurately image the image formed by the first lens assembly (not shown), which is a variable changer, at the actual image sensor position. can be done

The image sensor IS may be located inside or outside the second camera actuator. In an embodiment, as shown, the image sensor IS may be located inside the second camera actuator. The image sensor IS may receive light and convert the received light into an electrical signal. Also, the image sensor IS may have a plurality of pixels in the form of an array. And the image sensor IS may be located on the optical axis.

22 is a block diagram of a camera actuator according to an embodiment, FIG. 23 is a diagram for explaining the function of a control unit of the camera actuator according to the embodiment, and FIG. One view, Fig. 25 is a view showing the moving speed of the piezoelectric part or the moving part corresponding to temperature and frequency, Fig. 26 is a view showing the output of the driving signal corresponding to the first temperature and the second temperature, Fig. 27 is a view for explaining the operation of the comparison unit of the camera actuator according to the embodiment, FIG. 28 is a view for explaining the operation of the switch unit and the resistor unit according to the embodiment, and FIG. 29 is a view for explaining the operation by the control unit according to the embodiment is a drawing that

Referring to FIG. 22 , the camera actuator 1100 according to the embodiment may correspond to the above-described first camera actuator. Hereinafter, it will be described as a 'camera actuator'.

The camera actuator 1100 according to the embodiment may include a piezo driver 1130 , an optical member 1180 , a piezo driver 1190 , and a temperature sensor TS.

The piezoelectric driving unit 1130 may include a piezoelectric unit 1131 , a link unit 1132 , a moving unit 1133 , a movable unit 1134 , and a suction unit 1135 .

Here, the piezoelectric unit 1131 corresponds to the first and second piezoelectric units described above, the link unit corresponds to the first and second link units described above, and the moving unit 1133 moves to the first and second movement units described above. Corresponding to the part, the movable part 1134 may correspond to the above-described first and second movable parts, and the suction part 1135 may correspond to the first and second suction parts. Accordingly, the above description may be applied to the description of each component.

Accordingly, the piezoelectric part 1131 may expand and contract in one direction. For example, it can expand and contract along the optical axis or in a direction perpendicular to the optical axis. In addition, the link unit 1132 may be connected to the piezoelectric unit 1131 . Also, the moving unit 1133 may be connected to the link unit 1132 .

In addition, the moving unit 1133 may move the optical member 1180 by moving in one direction in response to the expansion/contraction speed of the piezoelectric unit 1131 . The optical member 1180 may correspond to the above-described optical member. That is, the optical member 1180 may move in the optical axis direction or in a direction perpendicular to the optical axis direction by the piezo driving unit 1130 .

In addition, the movable unit 1134 may be connected to the moving unit 1133 to come in contact with a rotation plate that moves the optical member 1180 . The rotation plate may correspond to the first rotation plate and the second rotation plate described above.

Also, the suction unit 1135 may be disposed adjacent to the rotation plate. Accordingly, the suction unit 1135 may pull the rotation plate to maintain a distance from the rotation plate in contact with the optical member 1180 .

The piezo driver 1190 may transmit a driving signal for driving the piezo driver 1130 to the piezo driver 1130 . For example, the driving signal may be a voltage that expands the piezoelectric unit 1131 of the piezoelectric driving unit 1130 . Accordingly, the piezo driver may be driven by a driving signal and move the above-described optical member 1180 .

According to an embodiment, the piezo driver 1190 may include a receiving unit 1191 , a control unit 1192 , a resistor unit 1193 , a switch unit 1194 , and a comparison unit 1195 .

The receiver 1191 may receive temperature data. The temperature data may be received from the temperature sensing unit TS. The temperature sensing unit TS may be present in the camera actuator as illustrated, or may be located in an optical device or electronic device including the camera actuator.

The controller 1192 may decrease the magnitude of the driving signal when the temperature data is greater than the first preset temperature.

Referring further to FIG. 23 , the piezo driver 1190 may further include a resistor unit 1193 connected to the output terminal Vout of the driving signal. Furthermore, the control unit 1192 may change the resistance of the resistor unit 1193 to reduce the magnitude of the driving signal.

For example, the controller 1192 may change the resistance of the resistor unit 1193 connected to the fixed resistor R5 connected to the output terminal Vout of the driving signal. Accordingly, the driving signal may be changed by the fixed resistor R5 and the resistor unit 1193 .

For example, when the resistance of the resistor unit 1193 is increased by the controller 1192 , the driving signal may decrease in size in response thereto.

24 and 25 , the dielectric constant of the piezoelectric driving unit including the piezoelectric unit may be diverged by changing the phase structure based on a predetermined temperature. That is, the nonlinearity of the piezoelectric part may increase. For example, when the driving voltage is 16V, a phase transition may occur due to a sudden increase in temperature under a condition of 60°C.

Furthermore, as the temperature of the piezoelectric driving unit including the piezoelectric unit increases, the speed or speed according to the peak voltage may decrease. As illustrated, the optimal driving frequency may decrease as the temperature increases as the temperature increases. Here, the optimal driving frequency means a frequency at which the driving speed of the piezo driving unit is maximum.

In addition, the driving speed of the piezo driving unit may increase as the driving signal increases (at the same frequency). In addition, when the temperature increases, the operating characteristics of the piezo driving unit may become non-linear according to the magnitude of the driving signal. In particular, at the first temperature (eg, 60° C.), the operating characteristic of the piezo actuator may change non-linearly.

In addition, the optimum driving frequency may be increased at a low temperature (maintaining the magnitude of the driving signal).

Referring further to FIG. 26 , the controller according to the embodiment increases the resistance of the resistor by applying (on) a control output when the temperature data is greater than the first temperature, which is a preset temperature, using the received temperature data as described above. can

Alternatively, the controller may reduce the resistance of the resistor by turning off the control output when the temperature data is smaller than the second temperature through the temperature data.

With this configuration, when the temperature data is greater than the first temperature, the resistance of the resistor may increase, and if the temperature data is less than the second temperature, the resistance of the resistor may decrease. In other words, when the temperature data is greater than the first temperature, the magnitude of the driving signal may decrease, and when the temperature data is less than the second temperature, the magnitude of the driving signal may increase. Accordingly, it is possible to output the maximum driving speed while suppressing the non-linearity according to the temperature. That is, the camera actuator according to the embodiment may maintain driving stability by maintaining the linear stone of the piezoelectric unit according to temperature, and may optimally output the moving speed of the optical member by the piezoelectric unit.

Furthermore, the second temperature may be less than the first temperature. Accordingly, since the magnitude of the driving signal is rapidly changed according to a change in temperature, deterioration of the reliability of the piezo driving unit can be suppressed. Accordingly, the piezoelectric part may not be destroyed by suppressing hysteresis through the first temperature and the second temperature.

Also, with further reference to FIGS. 27 and 28 , the piezo driver may include a switch unit 1194 connected to the front end of the resistor unit and a comparator 1195 connected to the front end of the switch unit.

The controller may adjust the input comparison signal applied to the comparator 1195 through the temperature data. For example, the controller may adjust the input comparison signal applied to the comparator 1195 by comparing the temperature data with the first temperature or the second temperature.

According to the input comparison signal, the comparator 1195 may transmit the output of the comparator to the switch unit 1194 . The switch unit 1194 may change the size of the resistor unit 1193 in response to the comparator output.

For example, when the temperature data is greater than the first temperature, the comparator 1195 may output the comparator output as high. In addition, when the temperature data is smaller than the second temperature, the comparator 1195 may output the comparator output as low. In this case, the switch unit 1194 may be driven on/off according to the output of the comparison unit 1195 corresponding to the input comparison signal.

In addition, the resistance of the resistor unit 1193 may change in response to on/off of the switch unit 1194 . Correspondingly, the switch unit 1194 may switch to increase the resistance of the resistor unit when the output of the comparator is high. Also, the switch unit 1194 may switch to reduce the resistance of the resistor unit when the output of the comparator is low. For example, the switch unit 1194 may include a Signal Pole Double Throw (SPDT).

Also, the comparator 1195 may adjust the applied input comparison signal. The comparator may be, for example, an op amp.

Referring further to FIG. 29 , the driving signal may be a pulse width modulation (PWM) signal. As for the driving signal, the description of the above-described driving signal may be applied except for the description below. In addition, the description will be based on progress.

In an embodiment, when the temperature is greater than the first temperature from the temperature data during forward movement, as described above, the controller may increase the resistance of the resistor to decrease the magnitude of the driving signal. Accordingly, the before-change driving signal V _before may be greater than the after-change driving signal V _after . In addition, the total voltage ST1 applied during the times t0 to t1 may also change before and after the change. For example, the total voltage ST1 may also decrease according to the change.

In addition, when the voltage is applied for a predetermined time (t1 to t2) and the pressing unit and the link unit are reduced at a speed greater than a predetermined speed, the position of the moving unit may be changed in the link unit. 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 part.

Similarly, when the temperature is greater than the first temperature from the temperature data at the time of reversing, as described above, the controller may increase the resistance of the resistor to decrease the magnitude of the driving signal PS1 ′. Accordingly, the before-change driving signal V _before may be greater than the after-change driving signal V _after . In addition, the total voltage ST1 applied during the times t0 to t1 may also change before and after the change. For example, the total voltage ST1 may also decrease according to the conversion.

Accordingly, when the temperature is greater than the first temperature, the camera actuator according to the embodiment may compensate for the speed decrease by the piezoelectric unit by changing the voltage. Accordingly, a decrease in reliability of the camera actuator due to heat generation or the like can be reduced.

30 is a view for explaining driving by a control unit according to a modified example.

Referring to FIG. 30 , when the temperature is greater than the first temperature from the temperature data when moving forward in the camera actuator according to the embodiment as described above, the controller increases the resistance of the resistor as described above to reduce the magnitude of the driving signal. . Accordingly, the before-change driving signal V _before may be greater than the after-change driving signal V _after . In addition, the total voltage ST1 applied during the times t0 to t1 may also change before and after the change. For example, the total voltage ST1 may also decrease according to the change.

Before the change, 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.

However, the total voltage ST2 applied during the time t1 to t2 after the change may be different from the total voltage ST1 applied during the time t0 to t1.

Also, as described above, the magnitude of the driving signal, that is, the voltage, may be different before and after the change during the times t0 to t1. On the other hand, the magnitude of the driving signal, that is, the voltage, may be maintained before and after the change during the times t1 to t2. Accordingly, when the pressing unit and the link unit are reduced at a speed greater than a predetermined speed, the position of the moving unit may be changed in the link unit. In particular, since the magnitude of the voltage does not decrease before and after the change, the speed of reduction can be maintained. Accordingly, the driving speed of the camera actuator may be maintained.

Similarly, when the temperature is greater than the first temperature from the temperature data at the time of reversing, as described above, the controller may increase the resistance of the resistor to decrease the magnitude of the driving signal PS1 ′. Accordingly, the before-change driving signal V _before may be greater than the after-change driving signal V _after . In addition, the total voltage ST1 applied during the times t0' to t1 may also change before and after the change. For example, the total voltage ST1 may also decrease according to the conversion. That is, these contents can be applied both when moving forward and when moving backward.

31 is a view for explaining an additional driving by a control unit according to an embodiment.

Referring to FIG. 31 , the controller according to the embodiment may decrease the frequency of the driving signal when the temperature data is greater than the first temperature again after reducing the magnitude of the driving signal.

In an embodiment, when the temperature is again greater than the first temperature from the temperature data during advance, as described above, the controller may increase the resistance of the resistor to further reduce the magnitude of the driving signal or decrease the frequency of the driving signal.

Accordingly, the frequency (f _before ) of the driving signal before the change may be greater than the frequency (f _after ) of the driving signal after the change. In other words, the period of the driving signal before the change may be smaller than the period of the driving signal after the change.

In addition, when the voltage is applied for a predetermined time (t1 to t2) and the pressing unit and the link unit are reduced at a speed greater than a predetermined speed, the position of the moving unit may be changed in the link unit. 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.

Similarly, when the temperature is greater than the first temperature from the temperature data when moving backward, as described above, the controller may increase the resistance of the resistor to decrease the size of the driving signal PS1 ′ or decrease the frequency of the driving signal. Accordingly, when the temperature is greater than the first temperature, the camera actuator according to the embodiment may compensate for the speed decrease by the piezoelectric unit by changing the voltage or the frequency of the voltage. Accordingly, a decrease in reliability of the camera actuator due to heat generation or the like can be reduced.

32 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied;

Referring to FIG. 32 , the mobile terminal 1500 according to the embodiment may include a camera module 1000 , a flash module 1530 , and an autofocus 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 the first camera module 1000 and the second camera module 1000 , and OIS may be implemented with the AF or zoom function by the first camera module 1000 . 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.

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

For example, FIG. 33 is an external view of a vehicle including a vehicle driving assistance device to which the camera module 1000 according to the embodiment is applied.

Referring to FIG. 33 , 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 will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (14)

optical member;
a piezo driving unit driven by a driving signal and moving the optical member; and
and a piezo driver connected to the piezo driving unit to drive the piezo driving unit;
The piezo driver is
a receiver for receiving temperature data; and
A camera actuator comprising a; when the temperature data is greater than a preset first temperature, the control unit to decrease the magnitude of the driving signal. According to claim 1,
The piezo driver further includes a resistor connected to the output terminal of the driving signal;
The controller is a camera actuator to change the resistance of the resistor to reduce the magnitude of the driving signal. 3. The method of claim 2,
The control unit is a camera actuator that increases the resistance of the resistance unit when the resistance is greater than the first temperature through the temperature data. 4. The method of claim 3,
When the temperature data through the temperature data is smaller than a second temperature, the controller decreases the resistance of the resistor unit. 5. The method of claim 4,
The second temperature is less than the first temperature of the camera actuator. 3. The method of claim 2,
The piezo driver is
The camera actuator further comprising; a switch unit connected to the front end of the resistor unit and a comparison unit connected to the front end of the switch unit. 7. The method of claim 6,
The control unit adjusts the input comparison signal applied to the comparison unit through the temperature data,
The switch unit drives on/off according to the output of the comparison unit corresponding to the input comparison signal,
The resistor unit is a camera actuator whose resistance changes in response to on/off of the switch unit. According to claim 1,
The driving signal is a pulse width modulation signal of the camera actuator. According to claim 1,
The control unit decreases the frequency of the driving signal when the temperature data is greater than the first temperature again after reducing the size of the driving signal. According to claim 1,
The camera actuator further comprising; a temperature sensing unit for generating the temperature data. According to claim 1,
The piezo drive unit,
a piezoelectric part that expands and contracts in one direction;
a link part connected to the piezoelectric part; and
A camera actuator comprising a; a moving unit connected to the link unit. 12. The method of claim 11,
The moving part is a camera actuator for moving the optical member by moving in the one direction in response to the expansion and contraction speed of the piezoelectric part. 13. The method of claim 12,
The piezo driving unit may include: a movable unit connected to the moving unit and in contact with a rotating plate for moving the optical member; and a suction unit disposed adjacent to the rotation plate. 14. The method of claim 13,
The suction unit is a camera actuator that pulls the rotation plate.

Images