WO2024056067A1

WO2024056067A1 - Piezoelectric actuator, driving device and camera module

Info

Publication number: WO2024056067A1
Application number: PCT/CN2023/119068
Authority: WO
Inventors: 唐磊; 傅强; 赵波杰; 郑雪莹
Original assignee: 宁波舜宇光电信息有限公司
Priority date: 2022-09-15
Filing date: 2023-09-15
Publication date: 2024-03-21

Abstract

Disclosed in the present application are a piezoelectric actuator, a driving device and a camera module. The piezoelectric actuator comprises: a piezoelectric vibrator, which comprises a front surface and a back surface, which are arranged opposite each other in a thickness direction; and a friction driving portion, which is fixed to the front surface of the piezoelectric vibrator in the thickness direction, wherein the friction driving portion is eccentrically arranged on the front surface of the piezoelectric vibrator in a lengthwise direction. In the above technical solution, by means of eccentrically providing the friction driving portion, the piezoelectric actuator may have different driving speeds in two opposite directions in the lengthwise direction of the piezoelectric actuator.

Description

Piezoelectric actuators, driving devices and camera modules

Technical field

This application relates to the field of camera module driving technology.

Background technique

With the popularity of mobile electronic devices, the related technologies of camera modules used in mobile electronic devices to help users obtain images (for example, videos or images) have developed rapidly and progressed, and in recent years, camera Modules have been widely used in many fields such as medical care, security, industrial production and so on.

In order to meet the increasingly broad market demand, high pixels and small size are the irreversible development trends of existing camera modules. The increased size of imaging lenses due to the need to use high-resolution image sensors brings new challenges to the driving elements used to drive optical components for optical performance adjustment.

Therefore, an adapted new driving solution for camera modules is needed to meet the driving requirements of the camera module for optical performance adjustment and to meet the development needs of lightweight and thin camera modules.

Contents of the invention

An object of the present application is to provide a piezoelectric actuator and a driving motor assembly that overcome the shortcomings of the prior art and can meet the driving requirements of camera modules at different driving speeds.

Another object of the present application is to provide a driving device and a camera module that overcome the shortcomings of the existing technology, can meet the driving requirements of the camera module for optical performance adjustment, and are suitable for achieving clear imaging.

Another object of the present application is to provide a camera module that overcomes the shortcomings of the existing technology, can meet the driving requirements of the camera module for optical performance adjustment, and is suitable for achieving fast and clear imaging.

According to one aspect of the present application, a piezoelectric actuator is provided, including:

A piezoelectric vibrator, the piezoelectric vibrator includes a front surface and a back surface arranged oppositely along the thickness direction; and

The friction driving part is fixed to the front surface of the piezoelectric oscillator along the thickness direction, wherein the friction driving part is eccentrically arranged on the front surface of the piezoelectric oscillator along the length direction.

In some embodiments, the piezoelectric vibrator includes two bending modes: a first bending mode and a second bending mode. The piezoelectric vibrator vibrates in the two bending modes, so that the piezoelectric actuator vibrates in the two bending modes. In the two bending modes, the driven object is driven to move in two opposite directions, the first direction and the second direction respectively.

In some embodiments, in the first bending mode, the piezoelectric vibrator forms a wave peak or a wave in its thickness direction. Mode bending vibration of a wave trough; in the second bending mode, the piezoelectric vibrator vibrates in a mode bending vibration of a wave peak and a wave trough in its thickness direction.

In some embodiments, the piezoelectric vibrator includes a first bending portion and a second bending portion connected in series along the length direction, the first bending portion is located below the friction driving portion, and in the first bending mode , the first bending part and the second bending part are axially symmetrical to each other; in the second bending mode, the first bending part and the second bending part are rotationally symmetrical to each other.

In some embodiments, the speed at which the piezoelectric actuator drives the driven object to move in the first direction is greater than the speed at which the piezoelectric actuator drives the driven object to move in the second direction, and the first direction is Refers to the eccentric direction of the friction driving part. The eccentric direction of the friction driving part is the direction in which the center of the piezoelectric vibrator points toward the friction driving part in the length direction.

In some embodiments, the piezoelectric vibrator includes multiple ceramic layers, multiple electrode layers spaced between adjacent ceramic layers, and side electrical conductive portions electrically connected to the multiple electrode layers. .

In some embodiments, the plurality of electrode layers includes at least a first electrode layer, at least a second electrode layer, at least a third electrode layer and at least a fourth electrode layer, and the side electrical conductive portion includes a first A side electrical connection part, a second side electrical connection part, a third side electrical connection part and a fourth side electrical connection part, the first side electrical connection part is electrically conductive with at least one of the first electrode layers, and the second side electrical connection part is electrically connected to at least one of the first electrode layers. The side electrical connection portion is in electrical conduction with at least one of the second electrode layers, the third side electrical connection portion is in electrical conduction with at least one of the third electrode layer, and the fourth side electrical connection portion is in electrical conduction with at least one of the third electrode layers. The four electrode layers are electrically conductive.

In some embodiments, at least one first electrode layer and at least one second electrode layer are arranged symmetrically with respect to the width direction of the piezoelectric oscillator, and at least one third electrode layer and at least one fourth electrode layer are arranged symmetrically with respect to the width direction of the piezoelectric oscillator. The electrode layers are arranged symmetrically with respect to the length direction of the piezoelectric vibrator.

In some embodiments, the friction driving portion is located between a quarter and a half of the length direction of the piezoelectric vibrator.

According to another aspect of the present application, a drive motor set is provided, including:

Piezoelectric actuators as previously described;

stator;

mover; and

Pre-pressure component, wherein the piezoelectric actuator is fixed to the stator through the pre-pressure component, and the piezoelectric actuator is frictionally coupled to the mover through the pre-pressure component and is It is configured to drive the mover to move along the length direction.

According to another aspect of the present application, a driving device is provided, including:

fixed part;

A movable part, the movable part is movably provided in the fixed part; and

A driving part, the driving part is provided between the fixed part and the movable part, the driving part drives the movable part to move in a first direction or a second direction, and the first direction is consistent with the movable part. The second direction is opposite, wherein the speed at which the driving part drives the movable part to move in the first direction is greater than the speed at which the driving part drives the movable part to move in the second direction.

In some embodiments, the driving part includes a piezoelectric oscillator and a friction driving part fixed to the piezoelectric oscillator, and the friction driving part is eccentrically disposed on the piezoelectric oscillator along a height direction.

In some embodiments, the piezoelectric vibrator includes two bending modes: a first bending mode and a second bending mode, and the driving part drives the movable part toward the first bending mode respectively in the two bending modes. direction or the second direction.

In some embodiments, along the height direction, the distance from the friction driving part to the top end of the piezoelectric oscillator is smaller than the distance from the friction driving part to the bottom end of the piezoelectric oscillator.

In some embodiments, the movable part includes a movable carrier and a friction plate, the friction plate is clamped between the movable carrier and the friction driving part, and the friction driving part is frictionally coupled. Connected to the friction plate.

In some embodiments, along the height direction, the distance from the friction driving part to the top end of the friction plate is smaller than the distance from the friction driving part to the bottom end of the friction plate.

In some embodiments, the driving device further includes a pre-pressure component, the pre-pressure component is disposed between the fixed part and the driving part, and the pre-pressure generated by the pre-pressure component causes the friction drive There is always frictional contact between the friction plate and the friction plate.

In some embodiments, the pre-pressure component includes two fixed ends and a connecting section integrally connected between the two fixed ends. The two fixed ends are fixed to the fixed part, and the connecting section is connected to the fixed part. There is a certain gap between the two parts, and the piezoelectric vibrator is arranged on the side of the connecting section away from the fixed part.

In some embodiments, the driving device further includes a guide device, the guide device is disposed between the fixed part and the movable part, and the movable part is clamped by the pre-pressure force. between components and the guide device.

According to another aspect of the present application, a camera module is provided, including:

optical lenses;

A photosensitive component, the optical lens is held on the photosensitive path of the photosensitive component; and

A driving device, wherein the optical lens is mounted on the movable portion of the driving device.

An optical lens, the optical lens includes a fixed group and a first movable group;

Driving device, the driving device includes a housing and a first driving component disposed in the housing, the fixed group is Fixed to the housing, the first driving assembly includes a first movable carrier, a first driving part and a first pre-pressure component, the first movable group is installed in the first movable carrier , the first driving part is frictionally coupled to the first movable carrier through the first pre-pressure component; and

A photosensitive component held on the light path of the optical lens, wherein the first driving part includes a first piezoelectric oscillator and a third piezoelectric oscillator that is eccentric along the length direction and is disposed on the front surface of the first piezoelectric oscillator. A friction driving part, when the first movable carrier is set in the initial position, the first movable carrier is eccentrically located on the working path of the first movable carrier, and the first movable carrier The eccentric direction of the initial position is opposite to the eccentric direction of the first friction drive part.

In some embodiments, the first driving speed at which the first driving part drives the first movable carrier to move in the eccentric direction of the first friction driving part is greater than the first driving speed at which the first driving part drives the first movable carrier. The second driving speed at which the moving carrier moves in the eccentric direction of the first friction driving part.

In some embodiments, the first driving part drives the first movable carrier to move in an eccentric direction of the first friction driving part at the first driving speed for coarse adjustment, so that the camera module The imaging of the group is close to clear, and then according to the clarity of the imaging, the first driving part drives the first movable carrier at the first driving speed to move in the eccentric direction of the first friction driving part or in the so-called first driving speed. The second driving speed drives the first movable carrier to move in a direction opposite to the eccentric direction of the first friction driving part for fine adjustment.

In some embodiments, when the first movable carrier is set to the initial position, the first movable carrier is located at one end of the working path of the first movable carrier biased toward the photosensitive component, and the The first driving part drives the first movable carrier to move in the direction toward the fixed group at the first driving speed for rough adjustment, and then the first driving part drives the first movable carrier in the direction of the fixed group according to the clarity of the imaging. The first driving speed drives the first movable carrier to move in a direction toward the fixed group or the second driving speed drives the first movable carrier to move in a direction toward the photosensitive component to perform Fine adjustments.

In some embodiments, the first driving part is elongated, and its length direction is consistent with the optical axis direction of the first movable group.

In some embodiments, the driving device further includes a first guide device configured to guide the movement of the first movable carrier, and the first guide device and the first driving part are respectively disposed on the first movable carrier. on both sides of the first movable carrier.

In some embodiments, the optical lens further includes a second movable group, the driving device further includes a second driving component movably disposed in the housing, the second driving component includes a Two movable carriers, a second driving part and a second pre-pressure component, the second movable group is installed in the second movable carrier, the second drive part passes through the second pre-pressure component Frictionally coupled to the second movable carrier, the second driving part includes a second piezoelectric oscillator and a second friction driving part eccentrically disposed on the front surface of the second piezoelectric oscillator along the length direction, When the second movable carrier is disposed in the initial position, the second movable carrier is eccentrically located on the working path of the second movable carrier, and the eccentric direction of the initial position of the second movable carrier with the second The eccentric direction of the friction drive part is opposite.

In some embodiments, the eccentric direction of the initial position of the second movable carrier is the same as the eccentric direction of the initial position of the first movable carrier.

In some embodiments, the second driving component is provided in the first driving component, and the second pre-pressure component is clamped between the first movable carrier and the second driving part. between.

In some embodiments, the camera module further includes a light turning component, which is fixed to the driving component and used to turn the imaging light.

Compared with the existing technology, this application has at least one of the following technical effects:

1. The piezoelectric vibrator vibrates in two bending modes, thereby driving the friction driving part to perform elliptical motion in two directions respectively, so as to drive the driven object to move in two opposite directions along the length of the piezoelectric vibrator to realize the camera model. Set of optical focus functions.

2. The piezoelectric vibrator vibrates in two bending modes to drive the friction driving part to perform elliptical motion in two directions, so that the driving device drives the first movable carrier along the optical axis direction of the first movable group. Moving in two opposite directions, the camera module can achieve clear imaging of subjects at different distances.

3. The friction driving part is eccentrically arranged on the piezoelectric oscillator along the length direction of the piezoelectric oscillator, so that the driven object moves at different speeds in two opposite directions along the length direction of the piezoelectric oscillator.

4. The friction driving part is eccentrically arranged on the piezoelectric oscillator along the length direction of the piezoelectric oscillator, so that the driving device drives the first movable group to move in two opposite directions along its optical axis at different speeds.

5. The optical lens is driven to move faster along the optical axis toward the object side to achieve rapid focusing of the camera module.

Additional embodiments and features are set forth in part in the description that follows, and will be apparent to those skilled in the art upon review of the specification, or may be learned by practice of the disclosed subject matter. A further understanding of the features and advantages of the present disclosure can be achieved by reference to the remainder of the specification and drawings, which form a part of this application.

Description of drawings

FIG. 1A is a schematic structural diagram of a piezoelectric actuator according to an embodiment of the present application.

FIG. 1B is a schematic structural diagram of another example of a piezoelectric actuator according to an embodiment of the present application.

2A and 2B are schematic side views and top views of a piezoelectric actuator according to embodiments of the present application.

3A and 3B are schematic diagrams of two bending modes of a piezoelectric vibrator when the piezoelectric actuator operates according to an embodiment of the present application.

FIG. 4 is a schematic diagram of the distribution of four regions of the piezoelectric vibrator of the piezoelectric actuator according to the embodiment of the present application.

FIG. 5A is a schematic structural diagram of a piezoelectric vibrator and its internal multi-layer electrode layers according to an embodiment of the present application.

FIG. 5B is an exploded schematic diagram of a piezoelectric vibrator according to an embodiment of the present application.

FIG. 6 is a schematic structural diagram of a multi-layer electrode layer inside a piezoelectric vibrator according to an embodiment of the present application.

FIG. 7 is a polarization diagram of a piezoelectric vibrator according to an embodiment of the present application.

Figure 8 is a schematic diagram of the mechanism of the drive motor set according to the embodiment of the present application.

Figure 9 is a schematic structural diagram of a camera module according to an embodiment of the present application.

FIG. 10 is a schematic top view of a driving device according to an embodiment of the present application.

Figure 11 is an exploded schematic diagram of a driving device according to an embodiment of the present application.

Figure 12 is a schematic cross-sectional view of a camera module according to an embodiment of the present application.

Figure 13 is a schematic cross-sectional view of a driving device according to an embodiment of the present application.

Figure 14 is a schematic diagram of the optical axis turning of the camera module according to the embodiment of the present application.

FIG. 15A is a schematic top structural view of the first embodiment of the camera module according to the embodiment of the present application.

FIG. 15B is a schematic side cross-sectional view of the first embodiment of the camera module according to the embodiment of the present application.

Figure 16 is a schematic structural diagram of a second embodiment of a camera module according to an embodiment of the present application.

Figure 17 is a schematic structural diagram of a third embodiment of a camera module according to an embodiment of the present application.

Detailed ways

Below, the present application will be further described with reference to specific implementation modes. It should be noted that, on the premise that there is no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

"Including", the term is open-ended. As used in the appended claims, this term does not exclude additional structures or steps.

In the description of this application, it should be noted that for directional words, such as the terms "center", "transverse", "vertical", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise" ", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation or be in a specific orientation. The construction and operation shall not be construed as limiting the specific scope of protection of this application.

It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

The terms "comprising" and "having" and any variations thereof in the description and claims of this application are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or product that includes a series of steps or units. Apparatus are not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such processes, methods, products or devices.

It should be noted that, as used in this application, the terms "substantially", "approximately" and similar terms are used to indicate approximation, rather than to indicate degree, and are intended to illustrate what would be expected by ordinary skill in the art. Inherent bias in measured or calculated values recognized by personnel.

In the description of this application, it should also be noted that, unless otherwise clearly stated and limited, the terms "setting", "installation", "connecting" and "connecting" should be understood in a broad sense. For example, it can be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, a contact connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

"Configured as," various units, circuits, or other components may be described or recited as being "configured to" perform one or more tasks. In such contexts, "configured to" is used to imply structure by indicating that the unit/circuit/component includes structure (eg, circuitry) that performs the task or tasks during operation. . Additionally, "configured to" may include general-purpose structures (eg, general-purpose circuitry) manipulated by software and/or firmware to operate in a manner capable of performing the task or tasks to be solved. "Configured to" may also include adjusting the system A manufacturing process (e.g., a semiconductor fabrication facility) to manufacture a device (e.g., an integrated circuit) suitable for realizing or performing one or more tasks.

The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the specification and the appended claims, the singular forms "a," "an," and "the" are intended to cover the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will also be understood that the terms "comprises" and/or "comprising" when used in this specification specify the presence of stated features, integers, steps, operations, elements and/or parts, but do not exclude the presence or addition of a or multiple other features, integers, steps, operations, elements, parts, and/or groupings thereof.

As used herein, the term "if" may be interpreted to mean "when" or "on" or "in response to determining" or "in response to detecting", depending on the context. Similarly, depending on the context, the phrase "if it is determined..." or "if [the stated condition or event] is detected" may be interpreted to mean "when it is determined..." or "in response to the determination... ” or “on detection of [stated condition or event]” or “in response to detection of [stated condition or event].”

Example piezoelectric actuator

A piezoelectric actuator is an actuator that uses the characteristics of piezoelectric ceramics to deform (elongate and contract) when applied voltage. It is an actuator that converts electrical energy into mechanical energy and is widely used in camera models. Among other equipment, it has the advantages of simple structure, high precision, fast response, low power consumption, and good stop and hold ability. 1A to 7 illustrate the structure and driving principle of the piezoelectric actuator described in this application.

Referring to FIGS. 1A and 1B , the piezoelectric actuator 10 described in the present application includes a piezoelectric vibrator 11 and a friction driving part 12 driveably connected to the piezoelectric vibrator 11 . The friction driving part 12 is fixed on the piezoelectric vibrator 11 . The electric vibrator 11 and therefore the friction drive unit 12 change the position information as the piezoelectric vibrator 11 deforms. The friction driving part 12 moves under the driving of the piezoelectric vibrator 11, so that the piezoelectric actuator 10 can drive the movement of the driven object through the friction force between the friction driving part 12 and the driven object. In a specific example, the friction driving part 12 generates an elliptical two-dimensional trajectory along with the deformation of the piezoelectric vibrator 11 , and the friction driving part 12 reciprocates under the driving of the piezoelectric vibrator 11 .

Since the piezoelectric actuator 10 drives the movement of the driven object through the friction force between the friction driving part 12 and the driven object, the material and shape of the friction driving part 12 become more important. The friction driving part 12 is made of a material with better friction performance and durability, for example, it can be made of a metal oxide material (for example, zirconia, aluminum oxide, etc.). The shape of the friction driving part 12 may be hemispherical, cylindrical, semi-cylindrical, truncated, rectangular, etc., for example, as shown in FIG. 1A . In one example of this application, the shape of the friction driving part 12 is cylindrical. The side surface of the friction driving part 12 is fixed to one side surface of the piezoelectric vibrator 11 by, for example, bonding. At this time, the friction driving part 12 can be in linear friction contact with the driven object. In another embodiment of this example, the cylinder The friction driving part 12 is fixed to one side of the piezoelectric vibrator 11 through its bottom surface, so that the friction driving part 12 can be in frictional contact with the surface of the driven object; in another example of this application, as shown in Figure 1B, the friction driving part 12 The shape of the portion 12 is hemispherical, and the bottom surface of the hemispherical friction driving portion 12 is fixed to one side surface of the piezoelectric oscillator 11 by, for example, bonding. At this time, the friction driving portion 12 can be in point frictional contact with the driven object.

FIG. 2A shows a side view of the piezoelectric actuator 10 shown in FIG. 1A . As shown in FIGS. 1A and 2A , the friction driving portion 12 is along the thickness direction of the piezoelectric vibrator 11 (that is, as shown in FIG. 1A Y-axis direction) is fixed to the front surface 114 of the piezoelectric oscillator 11 (that is, the first side surface of the piezoelectric oscillator 11). In this way, the piezoelectric actuator 10 is suitable for driving the driven object to move along the Z-axis direction. It is worth noting that in this application, the thickness direction of the piezoelectric actuator 10 is the Y-axis direction, and the driving direction of the piezoelectric actuator 10 is the Z-axis direction, perpendicular to the Y-axis direction as shown in FIG. 1A The direction of the axial direction and the Z-axis direction is the X-axis direction. Among them, the piezoelectric vibrator 11 is in a long strip shape, and the piezoelectric vibrator 11 has the longest length in the Z-axis direction. Therefore, the Z-axis direction can also be called the piezoelectric vibrator. The length direction of the vibrator 11 (piezoelectric actuator 10), the Y-axis direction is called the thickness direction of the piezoelectric vibrator 11 (piezoelectric actuator 10), and the X-axis direction can be called the thickness direction of the piezoelectric vibrator 11 (piezoelectric actuator 10). The width direction of the piezoelectric actuator 10). The longitudinal direction of the cylindrical friction drive portion 12 shown in FIG. 1A is perpendicular to the longitudinal direction of the piezoelectric vibrator 11 , and the cylindrical friction drive portion 12 extends in the X-axis direction.

Furthermore, the piezoelectric vibrator 11 has a rectangular parallelepiped or approximately rectangular parallelepiped shape, and the piezoelectric vibrator 11 has six sides: a first side, a second side, a third side, a fourth side, a fifth side and a sixth side. The piezoelectric vibrator 11 includes a front surface 114 and a back surface that are oppositely arranged along the thickness direction. The front surface 114 of the piezoelectric vibrator 11 on which the friction driving part 12 is installed is the first side, and the back surface opposite to the front surface 114 of the piezoelectric vibrator 11 is the second surface. The side, the third side and the fourth side are adjacent to the first side and the second side respectively and are symmetrical about the Z-axis direction. The fifth side and the sixth side are respectively adjacent to the other four sides and are symmetrical with respect to the X-axis direction. Using the dimensions shown in FIG. 1A , the fifth side and the sixth side are among the six sides of the piezoelectric vibrator 11 The two sides with the smallest area.

In this application, further, the friction driving part 12 is eccentrically arranged on the first side (ie, the front surface 114 ) of the piezoelectric oscillator 11 along the length direction of the piezoelectric oscillator 11 . FIG. 2B illustrates the front surface 114 of the piezoelectric actuator 10 shown in FIG. 1A from a top view. In one example, the front surface 114 of the piezoelectric vibrator 11 is in a rectangular or nearly rectangular shape, and the front surface 114 of the piezoelectric vibrator 11 has a relative shape. Two long sides 1141 are distributed and two short sides are distributed oppositely. The two short sides include a first short side 1142 and a second short side 1143. The friction driving part 12 is eccentrically arranged on the third side of the piezoelectric vibrator 11. A position closer to the first short side 1142 on one side. In one specific example, the piezoelectric actuator 10 is symmetrical with respect to the length direction, while it is asymmetrical with respect to the width direction.

Next, the driving process of the piezoelectric actuator 10 will be described. When the piezoelectric actuator 10 described in this application works, the piezoelectric vibrator 11 includes two bending modes: a first bending mode and a second bending mode. The first bending mode and the second bending mode are determined by inputting circuit signals of different frequencies. accomplish. The piezoelectric vibrator 11 vibrates in two bending modes, thereby respectively driving the eccentrically arranged friction driving part 12 to make elliptical motion in two directions, and then the piezoelectric actuator 10 drives the driven object in two bending modes respectively. The first direction and the second direction move in two opposite directions.

Referring further to Figures 3A, 3B and 4, specifically, Figures 3A and 3B illustrate two bending modes of the piezoelectric vibrator 11 when the piezoelectric actuator 10 is working, and Figure 4 illustrates the piezoelectric actuator. The four regions of the piezoelectric vibrator 11 of 10. Among them, FIG. 3A illustrates the first bending mode. In this first bending mode, the piezoelectric vibrator 11 bends and vibrates in a peak or a valley mode in its thickness direction, and is thus eccentrically fixed on the piezoelectric vibrator 11 The friction driving part 12 on the upper body can drive the driven object to move in the first direction. The first direction refers to the eccentric direction of the friction driving part 12 , that is, the eccentric direction of the friction driving part 12 , that is, the direction in which the center of the piezoelectric vibrator 11 points to the friction driving part 12 in the length direction, that is, in FIG. 2B The friction drive 12 is shown pointing in the direction of its adjacent nearest short side (first short side 1142).

In the first bending mode, the piezoelectric vibrator 11 bends and vibrates in a peak or a valley mode in its thickness direction. In other words, the piezoelectric vibrator 11 first bends upward from the straight state (M1) to the first bending state (M2) with only one wave peak. Then, the piezoelectric vibrator 11 returns to the straight state and then bends downward. There is a second bending state (M3) with only one trough. Then, the piezoelectric vibrator 11 becomes a flat state and repeats the above bending process, forming a bending vibration of the piezoelectric vibrator 11 in the first bending mode. Wherein, in the first bending mode, the bending state of the piezoelectric vibrator 11 includes a first bending state and a second bending state, and the first bending state of the piezoelectric vibrator 11 and the second bending state of the piezoelectric vibrator 11 are symmetrical with respect to the length direction. . It should be noted that in this application, the straight state refers to a relatively straight state relative to the curved state, and is not a completely straight state. In the first bending mode, the piezoelectric vibrator 11 has only one maximum amplitude in the bending state, and the piezoelectric vibrator 11 bends and vibrates in a symmetrical state, thereby driving the driven object toward the friction driving part 12 through the eccentrically arranged friction driving part 12 move in the eccentric direction.

Continuing to refer to FIG. 4 , the piezoelectric vibrator 11 includes a first bending portion 115 and a second bending portion 116 connected in series along the length direction, wherein the first bending portion 115 is located below the friction driving portion 12 . Further, along the width direction (ie, the X-axis direction), the piezoelectric vibrator 11 is divided into four regions. The piezoelectric vibrator 11 includes a first region 115a, a second region 115b, a third region 116c, and a fourth region 116d, where, The first area 115a and the second area 115b are located below the friction driving part 12. The third area 116c and the fourth area 116d are respectively adjacent to the first area 115a and the second area 115b, and are respectively the first area 115a in the counterclockwise direction. , the second area 115b, the fourth area 116d and the third area 116c. The first curved portion 115 includes a first region 115a and a second region 115b, the first region 115a and the second region 115b are parallel to each other; the second curved portion 116 includes a third region 116c and a fourth region 116d, the third region 116c and the fourth region 116d. The four areas 116d are parallel to each other.

In the first bending mode, after voltage is applied to the piezoelectric vibrator 11, the first region 115a elongates along the length direction, the second region 115b contracts along the length direction, the third region 116c elongates along the length direction, and the fourth region 116d Shrink along the length direction, thereby achieving the first bending state of the piezoelectric oscillator 11; and when the direction of the applied voltage is changed, the first region 115a shrinks along the length direction, the second region 115b elongates along the length direction, and the third region 116c contracts along the length direction, and the fourth region 116d extends along the length direction, thereby realizing the second bending state of the piezoelectric vibrator 11 . By repeatedly changing the direction of the voltage, the piezoelectric vibrator 11 can be switched between the first bending state and the second bending state, thereby realizing bending vibration with only one peak or one valley. When the piezoelectric vibrator 11 bends and vibrates in the first bending mode, the first bending part 115 and the second bending part 116 are axially symmetrical with each other. After the first bending part 115 is deformed, the second bending part 116 is deformed and together form the piezoelectric vibrator 11 A crest or trough in a curved state.

Part B of FIG. 3 illustrates the second bending mode. In this second bending mode, the piezoelectric vibrator 11 bends and vibrates in a mode of a peak and a valley in its thickness direction, and is thus eccentrically fixed on the piezoelectric vibrator 11 The friction driving part 12 can drive the driven object to move in the second direction. The second direction is opposite to the first direction, and the second direction is the direction in which the friction driving part 12 points to the center of the piezoelectric vibrator 11 in the length direction, that is, the friction driving part 12 shown in FIG. 2B points to its neighbor. The direction of the farthest short side (second short side 1143).

In the second bending mode, the piezoelectric vibrator 11 bends and vibrates in a mode of one peak and one valley in its thickness direction. In other words, the piezoelectric vibrator 11 first changes from the straight state (N1) to the third curved state (N2) with only one wave peak and one wave trough. Then, the piezoelectric vibrator 11 returns to the straight state and then bends in the opposite direction. It is the fourth bending state (N3) with only one wave peak and one wave trough. Then, the piezoelectric vibrator 11 becomes a flat state and repeats the above bending process, forming the bending vibration of the piezoelectric vibrator 11 in the second bending mode. Wherein, in the second bending mode, the bending state of the piezoelectric vibrator 11 includes a third bending state and a fourth bending state, and the third bending state of the piezoelectric vibrator 11 and the fourth bending state of the piezoelectric vibrator 11 are symmetrical with respect to the length direction. . It should be noted that in this application, the straight state refers to a relatively straight state relative to the curved state, and is not a completely straight state. In the second bending mode, the piezoelectric vibrator 11 has the maximum amplitude at only two places in the bending state. The piezoelectric vibrator 11 bends and vibrates in a rotationally symmetric state. The friction driving part 12 is provided in the second bending mode. The piezoelectric vibrator 11 has a maximum amplitude in the second bending mode. between the wave peaks and the wave troughs, so that the driven object is driven by the eccentrically arranged friction driving part 12 to move in the opposite direction (the second direction) of the eccentric direction of the friction driving part 12.

In the second bending mode, after voltage is applied to the piezoelectric vibrator 11, the first region 115a elongates along the length direction, the second region 115b contracts along the length direction, the third region 116c contracts along the length direction, and the fourth region 116d shrinks along the length direction. Elongate in the length direction, thereby realizing the third bending state of the piezoelectric oscillator 11; and when the direction of the applied voltage is changed, the first region 115a shrinks along the length direction, the second region 115b elongates along the length direction, and the third region 116c elongates along the length direction, and the fourth region 116d contracts along the length direction, thereby realizing the fourth bending state of the piezoelectric vibrator 11. By repeatedly changing the direction of the voltage, the piezoelectric vibrator 11 can be switched between the third bending state and the fourth bending state, thereby realizing bending vibration with only one peak and one valley. When the piezoelectric vibrator 11 bends and vibrates in the second bending mode, the first bending part 115 and the second bending part 116 are rotationally symmetrical to each other, and the first bending part 115 deforms to form a wave peak of the piezoelectric vibrator 11 in the bending state. The second bending part 116 is deformed to form a trough of the piezoelectric vibrator 11 in the bending state, which is the third bending state; or, the first bending part 115 is deformed to form a trough of the piezoelectric oscillator 11 in the bending state, and the second bending state is After the bending portion 116 is deformed, a wave peak of the piezoelectric vibrator 11 in the bending state is formed, which is the fourth bending state.

Specifically, in order for the friction driving part 12 on the piezoelectric vibrator 11 to move in two opposite directions respectively in the first bending mode and the second bending mode, the friction driving part 12 needs to be eccentrically arranged on the piezoelectric vibrator 11 at the same time. The front surface 114 of the vibrator 11 and the friction driving part 12 are disposed between the wave peaks and the wave troughs of the piezoelectric vibrator 11 in the second bending mode. Therefore, in this application, the friction driving part 12 is fixed to the front surface 114 of the piezoelectric vibrator 11 along the thickness direction, and the friction driving part 12 is located at a quarter to a half of the length direction of the piezoelectric vibrator 11 between. As shown in Figure 2B, Figure 3A and Figure 3B, the dotted line P represents one-half of the length of the piezoelectric vibrator 11, and the dotted line Q represents one-fourth of the length of the piezoelectric vibrator 11. Friction drive Part 12 is located between the dotted line Q and the dotted line P.

In one example, the friction driving part 12 is located between a quarter and a half of the length direction of the piezoelectric vibrator 11 , that is, the friction driving part 12 is disposed when the piezoelectric vibrator 11 is in the first bending mode. between its maximum amplitude point and one of its two maximum amplitude points of the piezoelectric vibrator 11 in the second bending mode. As shown in FIGS. 3A and 3B , the friction drive part 12 is disposed on one side of the highest point of the piezoelectric vibrator 11 in the first bending mode, and the friction drive part 12 is disposed on the piezoelectric vibrator in the third bending mode. The opposite side of the highest point of 11.

When the friction driving part 12 is located between one quarter and one half of the length of the piezoelectric vibrator 11, in the first bending mode, in the first bending state, the friction driving part 12 is located on one side of the crest of the piezoelectric vibrator 11, and the piezoelectric actuator 10 drives the driven object to move in a first direction through the friction driving part 12, wherein the direction in which the crest of the piezoelectric vibrator 11 points to the friction driving part 12 is the first direction; in the second bending mode, in the third bending state, the friction driving part 12 is located on the opposite side of the crest of the piezoelectric vibrator 11, and the piezoelectric actuator 10 drives the driven object to move in a second direction through the friction driving part 12, wherein the direction in which the friction driving part 12 points to the crest of the piezoelectric vibrator 11 is the second direction, and the second direction is opposite to the first direction.

In this application, in order to realize the deformation of the first bending portion 115 and the second bending portion 116 of the piezoelectric vibrator 11 in different bending modes, the first region 115a, the second region 115b and the second region of the first bending portion 115 can be configured respectively. The third area 116c and the fourth area 116d of the second bending part 116 are provided with piezoelectric layers, and then the first area 115a, the second area 115b, the third area 116c and the fourth area are respectively provided. The piezoelectric layer electrical signal of the region 116d is used to control the deformation states of the first region 115a, the second region 115b, the third region 116c and the fourth region 116d respectively. However, in this method, the piezoelectric actuator 10 requires the electrical signal to have a higher voltage, which affects the power consumption of the electronic device. A solution that can reduce the voltage is expected.

Figure 5A shows a schematic diagram of a stacked piezoelectric vibrator of the present application. Figure 5B shows an exploded schematic diagram of the stacked piezoelectric vibrator shown in Figure 5A. Figure 6 shows the stacked piezoelectric vibrator shown in Figure 5A. Schematic diagram of the multilayer electrode layers of a piezoelectric vibrator. As shown in FIGS. 5A , 5B and 6 , the piezoelectric vibrator 11 includes a multilayer ceramic layer 111 , a multilayer electrode layer 112 spaced between adjacent ceramic layers 111 and electrically connected to the multilayer electrode layer 112 The side electrical conduction part 113 provides electrical signals to the multi-layer electrode layers 112 to generate an electric field between adjacent electrode layers 112, and the ceramic layer 111 deforms (elongates) under the electric field of the adjacent electrode layers 112. ,shrink). By providing multiple electrode layers 112, the voltage required to drive the bending vibration of the piezoelectric vibrator 11 is reduced. The number of electrode layers 112 and the number of ceramic layers 111 are selected according to specific needs. In an example of this application , the number of ceramic layers 111 is greater than or equal to 5 layers. Among them, the ceramic layer 111 is made of ceramic material with piezoelectric effect, for example, it can be PZT piezoelectric ceramic; the electrode layer 112 is made of a material suitable for conduction, for example, it can be copper, gold, silver or silver alloy; side The electrical conduction part 113 is made of a material suitable for conducting electricity, for example, it can be copper, gold, silver or silver alloy, etc.; the fixation between the multi-layer ceramic layer 111 and the multi-layer electrode layer 112 can be achieved by using a ceramic co-firing process. A layer of ceramic slurry is laid, and then a layer of electrode slurry is laid, and then heated and fired together to form a stacked piezoelectric vibrator 11.

Continuing to refer to FIG. 5A, FIG. 5B and FIG. 6, the multi-layer electrode layer 112 includes at least a first electrode layer 112a, at least a second electrode layer 112b, at least a third electrode layer 112c and at least a fourth electrode layer according to functional division. 112d. Among them, at least one first electrode layer 112a and at least one second electrode layer 112b are arranged symmetrically with respect to the width direction (X-axis direction) of the piezoelectric oscillator 11, and at least one first electrode layer 112a and at least one second electrode layer 112b are symmetrical in length. Shorter short electrode layer, at least one first electrode layer 112a and at least one second electrode layer 112b are located on the same layer; at least one third electrode layer 112c and at least one fourth electrode layer 112d with respect to the length direction of the piezoelectric oscillator 11 ( Z-axis direction), at least one third electrode layer 112c and at least one fourth electrode layer 112d are respectively arranged on different layers. At least one third electrode layer 112c and at least one fourth electrode layer 112d are long electrodes with a longer length. layer. In this way, a long electrode layer formed of the first electrode layer 112a or the second electrode layer 112b is respectively provided on both sides of each third electrode layer 112c and each fourth electrode layer 112d.

In a specific example, at least one first electrode layer 112a is disposed in the first region 115a and the second region 115b of the first curved portion 115, and at least one second electrode layer 112b is disposed in the second region of the second curved portion 116. Among the three regions 116c and the fourth region 116d, at least one third electrode layer 112c is disposed in the second region 115b of the first curved portion 115 and the fourth region 116d of the second curved portion 116, and at least one fourth electrode layer 112d is It is provided in the first area 115a of the first bending part 115 and the third area 116c of the second bending part 116. Through such an arrangement, the deformation of the first region 115a, the second region 115b, the third region 116c and the fourth region 116d can be controlled respectively through electrical signals, thereby controlling the bending mode of the piezoelectric vibrator 11.

In order to facilitate the electrical connection between the multi-layer electrode layer 112 on the piezoelectric vibrator 11 and external equipment, the side electrical conduction part 113 is electrically connected to the external equipment. The side electrical conductive part 113 includes a first side electrical connection part 113a, a second side electrical connection part 113b, a third side electrical connection part 113c and a fourth side electrical connection part 113d. In one example, the first-side electrical connection part 113a, the second-side electrical connection part 113b, the third-side electrical connection part 113c and the fourth-side electrical connection part 113d are respectively provided on the piezoelectric vibrator 11 adjacent to the first side surface. on the third side and the fourth side, so that the piezoelectric vibrator 11 of the piezoelectric actuator 10 can be electrically connected to an external device from the side of the piezoelectric vibrator 11 . Specifically, the first-side electrical connection portion 113a is formed on the third side of the piezoelectric vibrator 11 and is electrically connected to at least one first electrode layer 112a; the second-side electrical connection portion 113b is formed on the third side of the piezoelectric vibrator 11 and is electrically connected to the first electrode layer 112a. It is electrically connected to at least one second electrode layer 112b; the third side electrical connection part 113c is formed on the fourth side of the piezoelectric vibrator 11 and is electrically connected to at least one third electrode layer 112c; the fourth side electrical connection part 113d is formed on the piezoelectric vibrator 11. The fourth side of the electric vibrator 11 is electrically connected to at least a fourth electrode layer 112d.

Through the above-mentioned arrangement of the multi-layer electrode layers 112, the multi-layer ceramic layers 111 disposed between the multi-layer electrode layers 112 can also be polarized by providing power to the multi-layer electrode layers 112. In a specific example, the third side electrical connection part 113c is connected to the positive voltage of the power supply, and the fourth side electrical connection part 113d is connected to the negative voltage of the power supply, thereby respectively providing at least a positive voltage of the third electrode layer 112c and providing at least A fourth electrode layer 112d has a negative voltage, thereby polarizing the multi-layer ceramic layer 111 disposed between the multi-layer electrodes. After the piezoelectric ceramics are polarized, the polarization directions are automatically arranged to form piezoelectricity. The polarization is carried out through the above specific examples. The polarization diagram of the piezoelectric vibrator 11 obtained is shown in Figure 7. It is worth noting that in order to clearly illustrate the polarization of the piezoelectric vibrator 11, the size ratio and the number of layers of the piezoelectric vibrator 11 are exaggerated.

After the polarization is completed, in order to drive the piezoelectric vibrator 11 of the piezoelectric actuator 10 to vibrate in the first bending mode or the second bending mode, respectively. Do not provide different electrical signals. Specifically, the third side electrical connection part 113c is connected to the ground wire to connect at least one third electrode layer 112c to the ground, and the fourth side electrical connection part 113d is connected to the ground wire to connect at least one fourth electrode layer 112d to the ground. , the first side electrical connection part 113a is connected to the first signal so that at least one first electrode layer 112a is connected to the first signal, and the second side electrical connection part 113b is connected to the second signal so that at least one first electrode layer 112a is connected to the first signal. The second electrode layer 112b is connected to the second signal, where the first signal and the second signal are the same, and are both sine wave or rectangular wave signals with the frequency F1. In this way, the piezoelectric vibrator 11 bends and vibrates in the first bending mode. , the piezoelectric actuator 10 can drive the driven object to move in the first direction at the first speed V1; the third side electrical connection portion 113c is connected to the ground wire to ground at least one third electrode layer 112c, so that the fourth The side electrical connection part 113d is connected to the ground wire so that at least one fourth electrode layer 112d is connected to the ground, and the first side electrical connection part 113a is connected to the third signal so that at least one first electrode layer 112a is connected to the third signal. , and connect the second side electrical connection portion 113b to the fourth signal so that at least one second electrode layer 112b is connected to the fourth signal, where the third signal and the fourth signal both have a frequency of F2 but a phase difference of A sine wave or rectangular wave signal of 180°, in other words, the frequency of the fourth signal and the third signal are equal, and the phase difference between the fourth signal and the third signal is 180°. In this way, the piezoelectric vibrator 11 is bent in the second direction. Mode bending vibration, the piezoelectric actuator 10 can drive the driven object to move in the second direction at the second speed V2. In a specific example, the frequency F1 of the first signal and the second signal is 225 kHz, and the frequency F2 of the third signal and the fourth signal is 463 kHz, that is, the electrical signal required for the bending vibration of the piezoelectric vibrator 11 in the second bending mode. The frequency is greater than the frequency of the electrical signal required for the bending vibration of the piezoelectric vibrator 11 in the first bending mode.

Further, in this application, the speed at which the piezoelectric actuator 10 drives the driven object to move in the first direction is greater than the speed at which the piezoelectric actuator 10 drives the driven object to move in the second direction, that is, the first speed V1 Greater than the second speed V2. In the first bending mode, the vibration frequency of the piezoelectric vibrator 11 is low but the vibration amplitude is large, so that the driving step length of the friction driving part 12 of the piezoelectric actuator 10 is longer but the driving frequency is low; while in the second bending mode , the vibration frequency of the piezoelectric vibrator 11 is high but the vibration amplitude is small, so that the driving step length of the friction driving part 12 of the piezoelectric actuator 10 is short but the driving frequency is higher. Therefore, the piezoelectric actuator 10 drives the driven object toward Two moving in opposite directions move at different speeds. In this application, the impact of the amplitude of the piezoelectric vibrator 11 on the driving speed of the piezoelectric actuator 10 is greater than the impact of the vibration frequency of the piezoelectric vibrator 11 on the driving speed of the piezoelectric actuator 10 . For example, in one example, the amplitude of the piezoelectric vibrator 11 in the first bending mode is more than five times greater than the amplitude of the piezoelectric vibrator 11 in the second bending mode, and the vibration frequency of the piezoelectric vibrator 11 in the first bending mode It is about half of the vibration frequency of the piezoelectric vibrator 11 in the second bending mode. Therefore, the first speed V1 at which the piezoelectric actuator 10 drives the driven object to move in the first direction is greater than the second speed V2 at which the piezoelectric actuator 10 drives the driven object to move in the second direction.

Example drive motor set

The present application further provides a driving motor set 20, as shown in Figure 8. The driving motor set 20 adopts the piezoelectric actuator 10 as shown in Figures 1 to 7, which is suitable for providing two opposite directions and speeds. Unequal linear drives.

As shown in FIG. 8 , the driving motor unit 20 includes a piezoelectric actuator 10 , a stator 21 , a mover 22 and a pre-pressure component 324 , wherein the piezoelectric actuator 10 is frictionally coupled to the mover through the pre-pressure component 324 22 and is configured to drive the mover 22 to move along the length direction. The piezoelectric actuator 10 can drive the mover 22 to move in two opposite directions at different speeds. The pre-pressure component 324 provides pressure of the piezoelectric actuator 10 toward the mover 22 so that the friction driving part 12 of the piezoelectric actuator 10 remains in contact with the mover 22 .

In one example, the piezoelectric actuator 10 is fixed to the stator 21 through a pre-pressure component 324. The pre-pressure component 324 may be an elastic piece, and the elastic piece is fixed to the piezoelectric actuator 10 and the stator 21 respectively. The piezoelectric actuator 10 is in frictional contact with the mover 22 through the friction driving part 12 , so that the mover 22 moves along the length direction of the piezoelectric actuator 10 under the action of friction. In this application, the friction driving part 12 of the piezoelectric actuator 10 used to drive the motor unit 20 is eccentrically arranged on the piezoelectric vibrator 11 of the piezoelectric actuator 10, and is driven by the piezoelectric actuator 10. The moving speed of the movable element 22 in the eccentric direction of the friction driving part 12 is greater than the moving speed of the driving movable element 22 in the opposite direction to the eccentric direction of the friction driving part 12 .

Example camera module

Figures 9 to 13 show the driving device 32 and the camera module 30 of the present application. The camera module 30 according to the embodiment of the present application is illustrated. It includes a photosensitive component 33 and is held on the photosensitive path of the photosensitive component 33. An optical lens 31, and a driving device 32 for driving the optical lens 31 to move to achieve optical performance adjustment, for example, to achieve anti-shake, focusing and other functions.

Correspondingly, the optical lens 31 includes a lens barrel and a plurality of optical lenses installed on the lens barrel. The optical lens 31 has an optical axis. The optical axis of the optical lens 31 is also the optical axis of the multiple optical lenses. The photosensitive component 33 It is arranged opposite to the optical lens 31 along the optical axis direction. For the convenience of description, the side of the camera module 30 facing the subject is called the object side, and the side of the camera module 30 facing the photosensitive component 33 is called the image side. side, the optical axis direction includes the direction along the optical axis pointing to the image side (referred to as the image side in this application), and the direction along the optical axis pointing to the object side (referred to as the object side in this application). The horizontal direction is perpendicular to the optical axis direction. direction, the height direction is the direction along the optical axis.

Continuing to refer to FIG. 12 , the optical lens 31 is fixed in the driving device 32 , and the photosensitive component 33 is fixed on the image side of the driving device 32 , and the optical lens 31 can be held on the photosensitive path of the photosensitive component 33 through the driving device 32 . The lens 31 is suitable to be driven by the driving device 32 to achieve anti-shake, focusing and other functions.

The photosensitive component 33 includes a chip circuit board 332 and a photosensitive chip 331 electrically connected to the chip circuit board 332 and a plurality of electronic components 333. The photosensitive chip 331 is used to receive the external light collected by the optical lens 31 and image it through the chip circuit board. 332 is electrically connected to external mobile electronic equipment. In one embodiment of the present application, the plurality of electronic components 333 may be one or more of passive electronic devices such as resistors and capacitors, and active electronic devices such as driver chips and memory chips.

The photosensitive component 33 further includes a filter component 334. The filter component 334 includes a filter element 3341. The filter component 3341 is held on the photosensitive path of the photosensitive chip 331. The filter component 3341 is disposed on the optical lens 31 and Between the photosensitive chips 331, it is used to filter the incident light entering the photosensitive chip 331, and filter out stray light such as infrared light that is not required for imaging in the incident light.

The filter assembly 334 also includes a filter element bracket 3342. The filter element 3341 is installed and fixed on the filter element bracket 3342 and corresponds to at least the photosensitive area of the photosensitive chip 331. The filter element bracket 3342 has a light hole that passes through The incident light of the optical lens 31 is incident on the photosensitive chip 331 through the light hole, and the filter element 3341 can be attached to the filter element holder 3342 upright or backward.

Further, the filter element bracket 3342 is fixed to the chip circuit board 332. In one embodiment of the present application, the photosensitive assembly 33 is fixed to the image side of the driving device 32 through the filter element bracket 3342. In another embodiment of the present application, In this example, the photosensitive element 33 can also be fixed on the image side of the driving device 32 through the chip circuit board 332 .

Among them, the filter element bracket 3342 can be pre-formed and then fixed to the chip circuit board 332 by bonding with an adhesive medium, or can be integrally formed on the chip circuit board 332 by a molding process. The molding method is directly fixed to the chip circuit board 332, and the present application is not limited by this.

Example drive unit

This application proposes a new type of driving device 32, which not only has relatively larger driving force and better driving performance (specifically including: higher precision driving control and longer driving stroke), but also has a small size. , low power consumption and other advantages to adapt to the current development trend of lightweight and thin camera modules.

In particular, this new type of driving device 32 is a piezoelectric actuator with a new structure, which can meet the technical requirements of the camera module 30 for the driver. Moreover, the piezoelectric actuator is further arranged in the camera module 30 in a suitable arrangement to drive the optical lens 31 to adjust its position so that it meets the structural design requirements and size design requirements of the camera module 30 .

In one embodiment of the present application, the driving device 32 drives the optical lens 31 to move along the optical axis direction, which can also be said to move along the height direction of the driving device 32, to adjust the distance between the optical lens 31 and the photosensitive component 33 to achieve the focusing function. In another embodiment of the present application, the driving device 32 drives the optical lens 31 to move along a plane perpendicular to the direction of the optical axis, so that the optical lens 31 moves in the horizontal direction relative to the photosensitive component 33 to achieve the anti-shake function.

Continuing to refer to FIGS. 9 to 13 , in one embodiment of the present application, the driving device 32 includes a fixed part 321 , a movable part 322 , a driving part 323 , a pre-pressure component 324 and a guide device 325 . Among them, the movable part 322, the driving part 323, the pre-pressure component 324 and the supporting device are accommodated in the fixed part 321, the optical lens 31 is arranged in the movable part 322, and the driving part 323 is arranged in the movable part 322 and The fixed part 321 drives the movable part 322 to move relative to the fixed part 321. The pre-pressure component 324 is provided between the driving part 323 and the fixed part 321 so that the movable part 322 and the driving part 323 always maintain frictional contact. , the guide device 325 is disposed between the movable part 322 and the fixed part 321 to provide guidance for the movement of the movable part 322. The driving device 32 includes an object side, an image side, and a peripheral side located between the object side and the image side. The peripheral side includes a first side, a second side, a third side, and a fourth side arranged in sequence around the optical axis.

Particularly, in the embodiment of the present application, the optical lens 31 is linkably installed on the movable part 322, and the photosensitive component 33 is fixedly installed on the fixed part 321. When realizing the optical focusing function of the camera module 30, the driving part 323 drives the optical lens 31 to move along the optical axis direction (or height direction) to adjust the distance between the optical lens 31 and the photosensitive component 33 so that the light from the subject passes through The optical lens 31 then reaches the photosensitive chip 331 of the photosensitive component 33, thereby achieving clear imaging.

Specifically, referring to Figure 11, in the embodiment of the present application, the fixed part 321 includes a base 3212 and an upper cover 3211 fastened on the base 3212. The base 3212 and the upper cover 3211 form a receiving cavity for placing the movable part 322 , the driving part 323, the pre-pressure component 324 and the supporting device are accommodated in it, which can not only protect the various components in the driving device 32 from being damaged by impact, but also can be used to prevent dust, dirt or stray light from entering the interior of the driving device 32 .

The upper cover 3211 includes an upper cover top 32111 and an upper cover side wall 32112 that integrally extends toward the base 3212, and is thereby fixed to the base 3212 through the upper cover side wall 32112, for example, by laser welding or adhesive medium bonding. Cover side walls 32112 and base 3212. Furthermore, the top 32111 of the upper cover and the base 3212 are both provided with openings corresponding to the optical lens 31 , so that the light reflected by the object can pass through the optical lens 31 and reach the photosensitive component 33 .

In particular, the fixed part 321 is a stator, and the movable part 322 is a mover. The movable part 322 is suspended in the receiving cavity of the fixed part 321, and the movable part 322 can be driven relative to the driving part 323. The fixing part 321 moves along the optical axis direction (or height direction) to realize the optical focusing function of the camera module 30 .

In the embodiment of the present application, continuing to refer to FIGS. 9 to 13 , the movable part 322 includes a movable carrier 3221 and a friction plate 3222 , and the optical lens 31 is disposed on the movable carrier 3221 , wherein the optical lens 31 is disposed on the movable carrier 3221 . The carrier 3221 includes but is not limited to bonding, threading or snapping. The movable carrier 3221 includes carrier side walls 32211 arranged sequentially along its circumference. In a specific example of this application, the number of carrier side walls 32211 is 4, namely the first carrier side wall 322111 and the second carrier side wall 322112. , the third carrier side wall 322113 and the fourth carrier side wall 322114, as shown in Figure 13. Among them, the first carrier side wall 322111 is located on the first side, the second carrier side wall 322112 is located on the second side, the third carrier side wall 322113 is located on the third side, and the fourth carrier side wall 322114 is located on the fourth side.

In another specific example of the present application, a first cut edge 32211a is provided at the corner of the first carrier side wall 322111 and the second carrier side wall 322112 of the movable carrier 3221, and on the second carrier side of the movable carrier 3221 A second cut edge 32211b is provided at the corner of the wall 322112 and the third carrier side wall 322113, and a third cut edge 32211c is provided at the corner of the third carrier side wall 322113 and the fourth carrier side wall 322114 of the movable carrier 3221. A fourth cutting edge 32211d is provided at the corner of the fourth carrier side wall 322114 and the first carrier side wall 322111 of the movable carrier 3221. That is, the number of carrier side walls 32211 of the movable carrier 3221 is 8, as shown in Figure Shown in 10.

The friction plate 3222 is provided on the carrier side wall 32211 of the movable carrier 3221. For example, the friction plate 3222 is integrally formed on the carrier side wall 32211. Of course, the friction plate 3222 and the carrier side wall 32211 can also be of a split structure, that is, the friction plate 3222 It is an independent component from the carrier side wall 32211 and is attached to the carrier side wall 32211 through adhesive. In a specific example of this application, the friction plate 3222 may be disposed on the first cutting edge 32211a; in another specific example of this application, the friction plate 3222 may be disposed on the first carrier side wall 322111.

Further, the friction plate 3222 is disposed on the side of the carrier side wall 32211 facing the driving part 323 , that is to say, the friction plate 3222 is clamped between the movable part 322 and the driving part 323 to pass the pre-pressure component 324 The driving part 323 is frictionally coupled to the friction plate 3222 due to the action of the friction plate 3222 . It should be understood that the function of the friction plate 3222 is to increase the friction force between the movable part 322 and the movable part 322 . The friction plate 3222 may be made of metal oxide material such as pickaxe oxide or aluminum oxide.

In the embodiment of the present application, the driving part 323 is disposed between the movable part 322 and the fixed part 321. The driving part 323 is fixed on the fixed part 321 and is in frictional contact with the movable part 322, thereby driving the movable part 322 along the light direction. Move in the axial direction (height direction) to achieve the optical focusing function. Among them, the driving part 323 is disposed on the peripheral side of the driving device 32 to avoid increasing the height of the driving device 32 .

It should be understood that in the technical solution of the present application, the driving part 323 adopts the piezoelectric actuator as mentioned above, wherein the driving part 323 includes a piezoelectric vibrator 11 and a friction driving part 12, and the friction driving part 12 is fixed on the piezoelectric actuator. The vibrator 11 and therefore the friction drive unit 12 change the position information as the piezoelectric vibrator 11 deforms. In one embodiment of the present application, the driving part 323 drives the movable part 322 to move in a first direction or a second direction, and the first direction is opposite to the second direction, wherein the driving part 323 drives the movable part 322 to move in the first direction. The speed of movement is greater than the speed of the driving part 323 driving the movable part 322 to move in the second direction. The first direction and the second direction are both the same as the height direction. For example, the first direction is toward the object side, and the second direction is toward the image side.

Specifically, the driving part 323 is provided between the fixed part 321 and the movable part 322, the piezoelectric vibrator 11 is fixed to the fixed part 321 through the pre-pressure member 324, the friction driving part 12 faces the movable part 322, and the friction plate 3222 is Clamped between the movable carrier 3221 and the friction driving part 12 , the friction driving part 12 is frictionally coupled to the friction plate 3222 . The friction driving part 12 is driven by the piezoelectric vibrator 11 to move Therefore, the driving part 323 can drive the movement of the movable part 322 through the friction force between the friction driving part 12 and the friction plate 3222 .

As can be seen from the above, the piezoelectric vibrator 11 has a rectangular parallelepiped or approximately rectangular parallelepiped structure. The length direction of the piezoelectric vibrator 11 is the height direction of the driving device 32. When the driving part 323 is provided with power excitation, the piezoelectric vibrator 11 generates a surface along the length direction. The shape changes, thereby driving the friction driving part 12 to reciprocate in the height direction. Due to the frictional contact between the friction driving part 12 and the friction plate 3222, the friction plate 3222 and the movable carrier 3221 are driven to move along the optical axis direction.

More specifically, the friction driving portion 12 is eccentrically provided on the piezoelectric vibrator 11 along the length direction of the piezoelectric vibrator 11 . It can also be said that the friction driving portion 12 is eccentrically provided on the piezoelectric vibrator along the height direction of the driving device 32 . 11 on. In one embodiment of the present application, along the height direction, the friction driving part 12 is disposed close to the top of the piezoelectric oscillator 11, that is, the distance from the contact point between the friction driving part 12 and the friction plate 3222 to the top of the piezoelectric oscillator 11 is smaller. It is smaller than the distance from the contact point between the friction driving part 12 and the friction plate 3222 to the bottom end of the piezoelectric vibrator 11 . Of course, along the height direction, the distance from the friction driving part 12 to the top end of the piezoelectric oscillator 11 is smaller than the distance from the friction driving part 12 to the bottom end of the piezoelectric oscillator 11 .

It should be understood that the piezoelectric vibrator 11 of the driving part 323 in this application has two bending modes: a first bending mode and a second bending mode. The first bending mode and the second bending mode are realized by inputting circuit signals of different frequencies. The piezoelectric vibrator 11 vibrates in two bending modes, thereby respectively driving the eccentrically arranged friction driving part 12 to make elliptical motion in two directions, and then the driving part drives the movable part 322 in the first direction respectively in the two bending modes. Or the second direction moves in these two opposite directions.

In the first bending mode, the piezoelectric vibrator 11 bends and vibrates in the form of a wave peak or a trough in its thickness direction, so that the friction driving part 12 eccentrically fixed on the piezoelectric vibrator 11 can drive the movable part 322 along the Move in the first direction; in the second bending mode, the piezoelectric vibrator 11 bends and vibrates in the form of a wave peak and a wave valley in its thickness direction, so that the friction driving part 12 eccentrically fixed on the piezoelectric vibrator 11 can The movable part 322 is driven to move in the second direction.

Furthermore, in the first bending mode, the piezoelectric vibrator 11 has only one maximum amplitude in the bending state, the piezoelectric vibrator 11 bends and vibrates in a symmetrical state, and the eccentrically arranged friction driving part 12 drives the movable part 322 to the friction direction. The eccentric direction (first direction) of the driving part 12 moves, that is, the movable part 322 moves toward the object side driven by the friction driving part 12; in the second bending mode, the piezoelectric vibrator 11 is in the bending state in only two places. With the maximum amplitude, the piezoelectric vibrator 11 bends in a rotationally symmetrical state, and the friction driving part 12 is disposed between the wave peak and the wave trough of the piezoelectric vibrator 11 in the second bending mode, so that it can be driven by the eccentrically arranged friction driving part 12 The movable part 322 moves in the opposite direction (second direction) to the eccentric direction of the friction driving part 12 , that is, the movable part 322 is driven by the friction driving part 12 to move toward the image side.

In the technical solution of the present application, the speed at which the movable part 322 is driven to move in the first direction is greater than the speed at which it is driven to move in the second direction, that is, the first speed V1 is greater than the second speed V2. In the first bending mode, the vibration frequency of the piezoelectric vibrator 11 is low but the vibration amplitude is large, so that the driving step length of the friction driving part 12 of the driving part 323 is longer but the driving frequency is low; while in the second bending mode, the piezoelectric vibrator 11 has a low vibration frequency but a large vibration amplitude. The vibration frequency of the vibrator 11 is high but the vibration amplitude is small, so that the driving step length of the friction driving part 12 of the driving part 323 is short but the driving frequency is higher. Therefore, the driving part 323 drives the movable part 322 in two opposite directions at different speeds. .

In the initial state, the optical lens 31 is closer to the image side, and the focus of the optical lens 31 falls behind the image plane of the photosensitive chip 331 . When performing optical focusing, the optical lens 31 can move toward the object side driven by the driving part 323 so that the focus of the optical lens 31 falls on the image plane of the photosensitive chip 331 . In this process, first, the driving part 323 drives the movable part 322 to drive the optical lens 31 to move along the first direction to reach the first position, where the subject can be blurred and imaged on the photosensitive chip 331 at the first position. ; Then, the driving part 323 drives the movable part 322 to drive the optical lens 31 to move along the first direction or the second direction to reach the second position, where the subject can be clearly imaged on the photosensitive chip 331 at the second position. It should be understood that since the optical lens 31 moves farther in the first direction, the optical lens 31 is driven to move faster in the first direction, which can make the optical lens 31 quickly move to the focus position, thereby achieving rapid focusing.

It should be understood that along the height direction, the distance from the friction driving portion 12 to the top end of the friction plate 3222 is smaller than the distance from the friction driving portion 12 to the bottom end of the friction plate 3222 . Since the optical lens 31 moves farther in the first direction, the distance from the friction driving part 12 to the bottom of the friction plate 3222 needs to be longer, so that the friction driving part 12 can always be in contact with the friction plate 3222 when it is driven to move in the first direction. Frictional contact is maintained between the friction plates 3222 . It can also be said that the distance from the friction driving part 12 to the bottom end of the friction plate 3222 is greater than or equal to the moving stroke of the movable carrier 3221, so that during the movement of the movable carrier 3221, the friction driving part 12 will not be damaged due to the insufficient length of the friction plate 3222. It is separated from the friction plate 3222, thereby affecting the driving effect.

More specifically, in one embodiment of the present application, the driving part 323 drives the movable part 322 to drive the optical lens 31 to move in the first direction to reach the first position, where the distance from the first position to the photosensitive chip 331 is greater than the distance between the first position and the photosensitive chip 331. The focal length of the lens 31; then, the driving part 323 drives the movable part 322 to drive the optical lens 31 to move in the second direction to reach the second position, where the distance from the second position to the photosensitive chip 331 is equal to the focal length of the optical lens 31, so that The focus of the optical lens 31 falls on the image surface of the photosensitive chip 331 .

In another embodiment of the present application, the driving part 323 drives the movable part 322 to drive the optical lens 31 to move along the first direction to reach the first position, where the distance from the first position to the photosensitive chip 331 is smaller than the distance between the optical lens 31 and the optical lens 31 . focal length; then, the driving part 323 drives the movable part 322 to drive the optical lens 31 to move along the first direction to reach the second position, where the distance from the second position to the photosensitive chip 331 is equal to the focal length of the optical lens 31, so that the optical lens 31 The focus of 31 falls on the image surface of the photosensitive chip 331.

Of course, in the technical solution of this application, after the optical lens 31 reaches the first position, it can move along the first direction or along the second direction multiple times to reach the second position, the third position, the fourth position, etc. , until the focus of the optical lens 31 falls on the image surface of the photosensitive chip 331, so that the photosensitive chip 331 can clearly image, and this application does not limit this.

In the embodiment of the present application, it is usually necessary to configure the pre-pressure component 324 to provide pre-pressure between the driving part 323 and the movable part 322 through the pre-pressure component 324. Under the action of the pre-pressure, the friction driving part of the driving part 323 is 12 is frictionally coupled to the friction plate 3222 of the movable part 322 to drive the movable part 322 to move in the driving direction through friction force.

The pre-pressure component 324 is disposed between the driving part 323 and the fixed part 321. The pre-pressure force generated by the pre-pressure component 324 keeps the frictional contact between the friction drive part 12 and the friction plate 3222 at all times. The pre-pressure component 324 includes two fixed ends 3241 and a connecting section 3242 integrally connected between the two fixed ends 3241 . The two fixed ends 3241 of the pre-pressure component 324 are fixed to the upper cover 3211 of the fixed part 321. The piezoelectric vibrator 11 of the driving part 323 is arranged on the connecting section 3242 of the pre-pressure component 324. The pre-pressure component 324 generates a force toward the movable part 322. Pre-pressure is applied so that the frictional contact between the friction driving part 12 of the driving part 323 and the friction plate 3222 of the movable carrier 3221 is always maintained.

Further, the inner side of the upper cover side wall 32112 is provided with a pre-pressure component 324 fixing position 321122, and the two fixed ends 3241 of the pre-pressure component 324 can be disposed on the pre-pressure component 324 fixing positions 321122, so that the pre-pressure component 324 can be easily installation, thereby making the structure of the driving device 32 more stable.

Since the connecting section 3242 and the piezoelectric vibrator 11 are in contact with each other, when the surface shape of the piezoelectric vibrator 11 changes, the connecting section 3242 of the pre-pressure component 324 will also deform accordingly. Therefore, a certain space is reserved between the connecting section 3242 and the inner surface of the upper cover side wall 32112 to provide sufficient space for the deformation of the pre-pressure component 324 . It can also be said that there is a certain gap between the connecting section 3242 and the fixed part 321 , and the piezoelectric vibrator 11 is arranged on the side of the connecting section 3242 away from the fixed part 321 , that is, the connecting section 3242 of the pre-pressure component 324 is away from the piezoelectric vibrator 11 One side is not in contact with the inner surface of the upper cover side wall 32112.

It should be understood that in one embodiment of the present application, the pre-pressure component 324 can be implemented as a spring piece; in another embodiment of the present application, the pre-pressure component 324 can be implemented as an elastic adhesive.

In order to improve the stability of the camera module 30 during the optical focusing process and improve the imaging quality, the guide device 325 is provided between the upper cover 3211 and the movable part 322. The guide device 325 can be used during the optical focusing process. The movable carrier 3221 is always supported so that it can move smoothly; the guide device 325 can also provide guidance for the movement of the movable part 322.

Specifically, a first guide groove 321121 is provided on the inner side of the upper cover side wall 32112 of the upper cover 3211. The first guide groove 321121 extends in the height direction, and a second guide groove is provided on the outer side of the carrier side wall 32211 of the movable carrier 3221. Groove 32212, the second guide groove 32212 extends along the height direction. The first guide groove 321121 and the second guide groove 32212 are arranged oppositely, and the guide device 325 is clamped between the first guide groove 321121 and the second guide groove 32212. The guide device 325 can avoid the movable carrier 3221 and the upper cover 3211 The direct contact between them reduces the generation of friction force during the movement of the movable carrier 3221. Further, the guide device 325 is disposed in the first guide groove 321121 and the second guide groove 32212, and the movement trajectory of the guide device 325 is limited to the first guide groove 321121 and the second guide groove 32212. The guide device 325 is in The first guide groove 321121 and the second guide groove 32212 move in the height direction, thereby providing guidance for the movement of the movable carrier 3221.

In one embodiment of the present application, the first guide groove 321121 may include two sub-guide grooves, the first sub-guide groove and the second sub-guide groove; the second guide groove 32212 may include two sub-guide grooves, and the third sub-guide groove and fourth sub-guide trough. Among them, the two sub-guide grooves of the first guide groove 321121 are arranged opposite to the two sub-guide grooves of the second guide groove 32212, and the number of the guide devices 325 is two. The two guide devices 325 are respectively clamped in two opposite sub-guide grooves. It should be understood that the first sub-guide groove and the second sub-guide groove are symmetrically provided on the inner side of the upper cover side wall 32112, and the third sub-guide groove and the fourth sub-guide groove are symmetrically provided on the movable carrier 3221. The outer surface of the carrier side wall 32211 enables the movable carrier 3221 to remain stable during movement without tilting.

As shown in Figure 10, in one embodiment of the present application, adapted to the structure of the movable carrier 3221, the pre-pressure component 324, the driving part 323 and the guide device 325 are all arranged on the cut edge of the movable carrier 3221 superior. This arrangement can make full use of the free space at the corner of the driving device 32, making the structure of the driving device 32 more compact, thereby reducing the size of the driving device 32. Specifically, the driving part 323 is disposed on the first cut edge of the movable carrier 3221, and the pre-pressure component 324 is fixed on the upper cover 3211 and abuts against the piezoelectric vibrator 11 of the driving part 323, so that the driving part 323 is driven by friction. The portion 12 is in frictional contact with the first cut edge of the movable carrier 3221. Of course, the first cutting edge of the movable carrier 3221 may be provided with a friction plate 3222, so that frictional contact is maintained between the friction driving part 12 and the friction plate 3222.

The two sub-guide grooves of the second guide groove 32212 are provided on the second and third cut edges of the movable carrier 3221, and the two sub-guide grooves of the first guide groove 321121 are provided on the upper cover side wall 32112 oppositely. In a specific embodiment, the second cut edge and the third cut edge of the movable carrier 3221 have inwardly extending grooves, and first sub-guide grooves and second sub-guide grooves are provided in the grooves. The side wall of the upper cover 32112 has an inwardly extending convex structure. The convex structure is provided with a third sub-guide groove and a fourth sub-guide groove. Of course, the grooves of the second and third cut edges of the movable carrier 3221 are in contact with the upper cover. The protruding structures of the side walls 32112 are arranged oppositely so that the guide device 325 can be clamped between the first guide groove 321121 and the second guide groove 32212.

Further, when the first sub-guide groove and the third sub-guide groove are arranged opposite to clamp the guide device 325, the opening directions of the first sub-guide groove and the third sub-guide groove are opposite; When the four sub-guide grooves are arranged oppositely to clamp the guide device 325, the opening directions of the second sub-guide groove and the fourth sub-guide groove are opposite. This arrangement can form a space between the first sub-guide groove and the third sub-guide groove to accommodate the guide device 325, and form a space between the second sub-guide groove and the fourth sub-guide groove to accommodate the guide device 325. Lead device 325. It should be understood that the opening directions of the first sub-guide groove and the second sub-guide groove may be the same or different, and the opening directions of the third sub-guide groove and the fourth sub-guide groove may be the same or different, which is not covered in this application. limit.

Along the optical axis direction, the two guide devices 325 are symmetrically arranged with respect to the center line of the friction driving part 12. Since the piezoelectric vibrator 11 deforms during the movement stroke, the friction driving part 12 generates an elliptical orbit shape along with the deformation of the piezoelectric vibrator 11. two-dimensional trajectory, thereby causing the friction driving part 12 to generate a tilting moment exerted on the friction plate 3222 of the movable carrier 3221 in the stroke trajectory, and the symmetrically arranged guide device 325 can disperse the tilting moment, so that the movable carrier 3221 The structure is more stable.

As shown in Figure 13, in another embodiment of the present application, the guide device 325 and the pre-pressure component 324 are disposed on opposite sides of the movable carrier 3221. For example, when the pre-pressure component 324 is disposed on the movable carrier On the first carrier side wall 322111 of 3221, the guide device 325 is disposed on the fourth carrier side wall 322114 opposite thereto. The pre-pressure component 324 generates a pre-pressure force in the horizontal direction toward the guide device 325. The effect of the pre-pressure force can not only maintain frictional contact between the friction drive part 12 and the movable carrier 3221, but also enable the guide device 325 to be always clamped. It is held between the upper cover 3211 and the movable carrier 3221.

The movable carrier 3221 is clamped between the guide device 325 and the driving part 323, and the driving part 323 and the movable carrier 3221 are clamped between the pre-pressure component 324 and the guide device 325, that is, the movable carrier 3221 is The guide device 325 and the pre-pressure component 324 are suspended in the upper cover 3211. This arrangement can make the structure of the driving device 32 more compact and the position of each component more reasonable.

It should be understood that the guide device 325 can be implemented as a ball. In a specific example of this application, the number of the ball is four, which are respectively clamped in the two sub-guide grooves of the first guide groove 321121 and the second guide groove 32212. Between the two sub-guide grooves, two balls are provided between each two sub-guide grooves, so that the movable carrier 3221 can remain stable. In another specific example of this application, the number of balls is six, and three balls are arranged between each two sub-guide grooves, and the three balls are stacked in the height direction. In particular, the diameter of the two balls located on the upper and lower sides of the three balls is larger than the diameter of the ball located in the middle to avoid interference during movement. Of course, the guide device 325 can also be implemented as a slider or a guide rod, which is not limited in this application.

Further, in the embodiment of the present application, the driving device 32 also includes an electrical connection part 326. The electrical connection part 326 is provided between the pre-pressure component 324 and the upper cover side wall 32112, and is used to electrically connect the piezoelectric connection of the driving part 323. The vibrator 11 is used to realize the circuit conduction of the driving device 32. Of course, the electrical connection portion 326 can be directly electrically connected to the mainboard of the electronic device, or can be extended to the photosensitive component 33 and electrically connected to the chip circuit board 332 , which is not limited in this application.

It should be understood that in the embodiment of the present application, the driving device 32 further includes a position sensing part 327. The position sensing part 327 It includes a position sensing element 3271 and a position sensing magnet 3272, wherein the position sensing element 3271 is provided on one of the movable carrier 3221 and the upper cover 3211, and the position sensing magnet 3272 is provided on the movable carrier 3221 and the upper cover 3211. On the other of the upper cover 3211, the position sensing element 3271 and the position sensing magnet 3272 are arranged oppositely. When the movable carrier 3221 is driven to move, the relative position of the position sensing element 3271 and the position sensing magnet 3272 changes. According to the magnetic field strength of the position sensing magnet 3272 sensed by the position sensing element 3271, it can be The position of the movable carrier 3221 is determined, and then the excitation voltage of the piezoelectric vibrator 11 is adjusted so that the movable carrier 3221 moves to the required position.

In a specific example of this application, the position sensing element 3271 is disposed on the upper cover side wall 32112 to achieve circuit conduction of the position sensing portion 327 through the electrical connection portion 326 disposed on the upper cover side wall 32112 to simplify Conductive structure of drive device 32 . In this application, the position sensing element 3271 may be a Hall element, a driver IC or a TMR.

Of course, in one embodiment of the present application, the position sensing portion 327 can be disposed on the third cutting edge of the movable carrier 3221 to make the structure of the driving device 32 more compact, thereby making the structure of the driving device 32 more stable. Of course, the position sensing portion 327 can also be disposed at other positions of the driving device 32. For example, the position sensing portion 327 is disposed on the second carrier side wall 322112, and this application does not limit this.

Exemplary driving device and corresponding camera module

The present application further provides a driving device 42 using the above-mentioned piezoelectric actuator 10 and a camera module 40 using the driving device 42 . As shown in FIGS. 14 to 17 , the camera module 40 described in this application includes an optical lens 41 , a driving device 42 and a photosensitive component 44 . Wherein, the optical lens 41 is arranged in the driving device 42. The optical lens 41 includes a fixed group 411 and at least one movable group arranged along the optical axis of the optical lens 41. The fixed group 411 is fixed to the driving device 42. At least one movable group is adapted to be driven by the driving device 42 to move relative to the fixed group 411, thereby changing the focal length of the optical lens 41. The photosensitive component 44 is maintained on the light path of the optical lens 41, and the photosensitive component 44 is suitable for receiving The light rays collected by the optical lens 41 form an image.

In this application, the camera module 40 further includes a light turning component 43. The light turning component 43 is fixed to the driving device 42 and is used to turn the imaging light. The light turning component 43 receives the imaging light from the photographed target and forms the image. The light is redirected to the optical lens 41. The light turning component 43 includes a light turning element 431. The light turning element 431 can turn light, so that the imaging light from the subject is turned at a certain angle and then projected to the optical lens 41. In an example of this application, as shown in Figure 14 Indicatively, the light turning element 431 is configured to turn the imaging light from the photographed target by 90°, so that the optical path in the camera module 40 described in this application is folded, and the overall height of the camera module 40 is reduced. Forming a periscope camera module. Here, considering manufacturing tolerances, in actual work, the angle at which the light turning element 431 turns the imaging light may have an error within 1°, which should be understood by those of ordinary skill in the art. In a specific example, the light-bending element 431 may be implemented as a mirror (eg, a planar mirror), or as a light-bending prism (eg, a triangular prism).

In an example of this application, the light turning component 43 also includes a light turning driver 432. The light turning element 431 is installed in the light turning driver 432. The light turning driver 432 can drive the light turning element 431 to rotate to realize the camera module. 40 degree of anti-shake function.

The driving device 42 includes a housing 421 and at least one driving component disposed in the housing 421 . The housing 421 includes an upper cover 4211 and a base 4212. The upper cover 4211 and the base 4212 engage with each other to form a receiving cavity to accommodate the at least one driving component. In one example of this application, the light turning component 43 and the photosensitive component 44 are respectively fixed to both sides of the driving device 42 in the form of a base 4212 fixed to the housing 421 to communicate with the light entrance side and the light exit side of the optical lens 41 respectively. Corresponding. The light incident side of the optical lens 41 is the light incident side of the driving device 42, and the light exit side of the optical lens 41 is the light exit side of the driving device 42. Specifically, the light turning component 43 is fixed on the light incident side of the driving device 42, Therefore, the imaging light that is turned by the light turning element 431 can be projected into the optical lens 41 from the light entrance side of the optical lens 41; the photosensitive component 44 is fixed on the light exit side of the driving device 42, so that the light that is converged by the optical lens 41 can be projected from the optical lens 41. The light emitted from the light exit side of 41 is then projected into the photosensitive component 44 .

In this application, the photosensitive component 44 corresponds to the optical lens 41 and is used to receive the imaging light from the optical lens 41 and perform imaging. The photosensitive component 44 includes a chip circuit board 442 and a circuit board electrically connected to the chip circuit board 442. Photosensitive chip 441 and at least one electronic component 443. The photosensitive chip 441 is used to receive the imaging light collected by the optical lens 41 for imaging and to be electrically connected to an external mobile electronic device through the chip circuit board 442. In an example of this application, the electronic component 443 may be one or more of passive electronic devices such as resistors and capacitors, and active electronic devices such as driver chips and memory chips.

The photosensitive component 44 also includes a filter component 444. The filter component 444 includes a filter element 4441. The filter component 4441 Being held on the photosensitive path of the photosensitive chip 441, the filter element 4441 is disposed between the optical lens 41 and the photosensitive chip 441, which is used to filter the incident light entering the photosensitive chip 441, and filter out the incident light, such as infrared rays. Wait for stray light that is not needed for imaging.

In a specific example, the filter assembly 444 also includes a filter bracket 4442. The filter element 4441 is installed and fixed on the filter bracket 4442 and corresponds to at least the photosensitive area of the photosensitive chip 441. The filter bracket 4442 has a light-passing The incident light passing through the optical lens 41 is incident on the photosensitive chip 441 through the light hole. Further, the filter bracket 4442 is fixed to the chip circuit board 442. In one specific example, the photosensitive component 44 is fixed to the light exit side of the driving device 42 through the filter bracket 4442; in another specific example, the photosensitive component 44 passes through the chip. The circuit board 442 is fixed on the light exit side of the driving device 42 . It is worth noting that the filter bracket 4442 can be pre-formed and then fixed to the chip circuit board 442 by bonding with an adhesive medium, or can be integrally formed on the chip circuit board 442 by a molding process. This application is not limited by this.

Referring further to FIGS. 15A and 15B , FIG. 15A shows a schematic diagram of the first embodiment of the camera module 40 described in this application, and FIG. 15B shows a schematic cross-sectional view of the camera module 40 described in FIG. 15A . In this embodiment, at least one movable group includes one movable group (first movable group 412), and at least one driving component includes one driving component (first driving component 422). Specifically, the optical lens 41 includes a fixed group 411 and a first movable group 412, wherein the first movable group 412 can be adjusted relative to the fixed group 411 under the action of the driving device 42, so that To adjust the optical performance of the camera module 40; the driving device 42 includes a housing 421 and a first driving component 422 disposed in the housing 421. The housing 421 includes an upper cover 4211 and a base 4212.

The fixed group 411 of the optical lens 41 includes a fixed lens barrel 4111 and at least one fixed lens 4112 accommodated in the fixed lens barrel 4111. In this application, the fixed group 411 is fixed to a non-moving part of the driving device 42 so that the position of the fixed group 411 in the optical lens 41 remains constant. For example, in one example, the fixed group 411 is fixed to 421 on the base 4212 of the housing of the driving device 42 . It is worth mentioning that in other examples of this application, the fixed group 411 may not be provided with a fixed lens barrel 4111, and may only include at least one fixed lens 4112. For example, it may only include one fixed lens 4112 or only include mutually embedded lenses. Combined multi-piece fixed lens 4112. That is, in other examples of this application, the fixed group 411 may be implemented as a "naked lens".

The first movable group 412 of the optical lens 41 includes a first movable lens barrel 4121 and at least one first movable lens 4122 accommodated in the first movable lens barrel 4121. The first movable group 412 is provided with an optical axis. Wherein, the first movable group 412 is adapted to be driven by the driving device 42 to move along the optical axis direction set by the first movable group 412, thereby realizing the focal length adjustment of the optical lens 41, so that The camera module 40 can achieve clear photography of subjects at different distances. It is worth mentioning that in other examples of this application, the first movable group 412 may not be provided with the first movable lens barrel 4121, and may only include at least one first movable lens 4122. For example, it may only include One first movable lens 4122 or only includes multiple first movable lenses 4122 that are fitted to each other. That is, in other examples of this application, the first movable group 412 can also be implemented as a "naked lens".

The first driving component 422 of the driving device 42 is disposed in the accommodation cavity formed by the mutual interlocking of the upper cover 4211 and the base 4212. The first driving component 422 includes a first movable carrier 4221, a first driving part 4222 and a The first pre-pressure component 4223. Specifically, in this embodiment, the first driving part 4222 is implemented as the piezoelectric actuator 10 as shown in FIGS. 1A to 8 , and the first movable group 412 is installed on the first movable carrier. 4221, wherein the first driving element is configured to drive the first movable carrier 4221 to drive the first movable group 412 to move along the direction set by the optical axis of the first movable group 412. It should be noted that in this application, the structure and characteristics of the first driving part 4222 are the same as the piezoelectric actuator 10 shown in FIGS. 1A to 8 . The piezoelectric actuator 10 shown in FIGS. 1A to 8 It can be fully applied to the first driving part 4222 described in this application.

The first driving part 4222 includes a first piezoelectric oscillator 11a and a first friction driving part 12a driveably connected to the first piezoelectric oscillator 11a, wherein after the first driving part 4222 is turned on, the first friction driving part The portion 12a is configured to provide a driving force for driving the first movable carrier 4221 under the action of the first piezoelectric vibrator 11a. The first movable carrier 4221 is movably provided in the housing 421 .

1A to 8 , the first friction driving part 12 a is fixed to the front surface of the first piezoelectric vibrator 11 a (that is, the first piezoelectric vibrator 11 a ) along the thickness direction (that is, the Y-axis direction shown in FIG. 1A ). the first side surface of the piezoelectric vibrator 11a). In one example, the first friction driving part 12a is eccentrically arranged on the front surface of the first piezoelectric vibrator 11a (that is, the first side surface of the first piezoelectric vibrator 11a) along the length direction of the first piezoelectric vibrator 11a, and In a specific example, the first friction driving part 12a is located between a quarter and a half of the length direction of the first piezoelectric vibrator 11a.

The first driving part 4222 is frictionally coupled to the first movable carrier 4221 through the first pre-pressure component 4223 and is configured to drive the first movable carrier 4221 and the first movable group 412 mounted thereon along the first The optical axes of a movable group 412 are directed toward two opposite direction movement. The first pre-pressure component 4223 is clamped between the base 4212 of the housing 421 and the first driving part 4222. The first pre-pressure component 4223 provides the pressure of the first driving part 4222 toward the first movable carrier 4221, so as to The first friction driving part 12a of the first driving part 4222 is kept in contact with the first movable carrier 4221, and further the first friction driving part 12a and the first movable carrier 4221 are in frictional contact. In a specific example, the first pre-pressure component 4223 may be implemented as a spring piece, and the first pre-pressure component 4223 is fixed between the base 4212 and the first driving part 4222.

In an example of this application, the first movable carrier 4221 includes a first carrier body 42211 and a first friction part 42212. The first movable group 412 is installed in the first carrier body 42211, the first friction part 42212 is provided between the first carrier body 42211 and the first driving part 4222, and the first friction driving part of the first driving part 4222 The portion 12a resists the first friction portion 42212 under the action of the first pre-pressure component 4223. In this way, the friction driving force provided by the first driving portion 4222 can act on the first carrier body 42211 through the first friction portion 42212. To drive the first carrier body 42211 to move.

In an example of this application, the first friction part 42212, the first driving part 4222 and the first pre-pressure component 4223 are all disposed on the side of the first carrier body 42211. Specifically, the first carrier body 42211 has a U-shaped cross-section, the first movable carrier 4221 is installed in the first carrier body 42211 from the opening along the height direction, and the first friction part 42212 is provided on the side of the first carrier body 42211 , correspondingly, the first driving part 4222 and the first pre-pressure component 4223 are provided on the same side, wherein the first pre-pressure component 4223 is fixed to the base 4212 and is opposite to the side of the first carrier body 42211 where the first friction part 42212 is provided. corresponding side.

It is worth mentioning that although in the examples shown in FIGS. 15A and 15B , the first friction part 42212 is provided as a separate component between the first driving part 4222 and the first carrier body 42211 , it should be understood that , in other examples of this application, the first friction part 42212 can also be integrally formed on the side surface of the first carrier body 42211. For example, the first friction part 42212 serves as a friction coating coated on the side surface of the first carrier body 42211. , this is not limited by this application. The first friction part 42212 can be made of a material with better friction performance and durability, for example, it can be made of a metal oxide material (for example, zirconia, alumina, etc.).

In an example of the present application, the driving device 42 further includes a guide device 424 configured to guide the first movable carrier 4221 to move. The guide device 424 includes a first guide device 4241. In one example, the driving device 42 includes a first guide device 4241 configured to guide the movement of the first movable carrier 4221. The first guide device 4241 is The first movable carrier 4221 is disposed on the right side where the first driving part 4222 is not provided. In other words, the first guide device 4241 and the first driving part 4222 are respectively disposed on both sides of the first movable carrier 4221. In this way, The internal components of the driving device 42 can be arranged more compactly, so that the volume of the driving device 42 can be reduced.

In a specific example of the present application, the first guide device 4241 is implemented as a guide rod to achieve the guide function. The first guide device 4241 includes two first fixing devices spaced apart from the base 4212 of the housing 421 . part 42412 and a first guide rod 42411 that is installed between the two first fixed parts 42412 and penetrates the first movable carrier 4221. The first guide rod 42411 is parallel to the optical axis of the first movable group 412, so that the first guide rod 42411 is parallel to the optical axis of the first movable group 412, so that the first guide rod 42411 is A movable carrier 4221 can be guided to move in a direction parallel to the optical axis of the first movable group 412 .

In this application, the first driving part 4222 is in a long strip shape, and its length direction is consistent with the optical axis direction of the first movable group 412. In this application, because the first driving part 4222 described in this application has A friction driving part 12a is eccentrically arranged on the first side of the first piezoelectric oscillator 11a along the length direction of the first piezoelectric oscillator 11a, and since the vibration frequency and bending amplitude of the first piezoelectric oscillator 11a are in two It is not the same in the bending mode. The first driving part 4222 implemented as the piezoelectric actuator 10 described in the present application drives the first movable carrier 4221 along two opposite directions of the optical axis of the first movable group 412 Movements do not move at the same speed. Therefore, the first movable carrier 4221 can be eccentrically arranged between the fixed group 411 and the photosensitive component 44, so that the property of the first driving part 4222 having different speeds in two opposite directions can be reasonably utilized.

The first movable carrier 4221 has a working path, and the first movable carrier 4221 moves on the working path driven by the first driving part 4222 to adjust the optical performance of the camera module 40 (for example, to realize the zoom function). Furthermore, the first movable carrier 4221 also has an initial position. The initial position of the first movable carrier 4221 refers to the position of the first movable carrier 4221 on the working path when the driving device 42 or the camera module 40 just enters the working state. The position, in other words, is the position where the first movable carrier 4221 is located when the driving device 42 or the camera module 40 is in the initial state.

In an example of this application, when the first movable carrier 4221 is set to the initial position, the first movable carrier 4221 is eccentrically located on the working path of the first movable carrier 4221. The initial position of the first movable carrier 4221 The eccentric direction is driven by the first friction The eccentric direction of the portion 12a is opposite. Wherein, the eccentric direction of the first friction driving part 12a refers to the direction in which the center of the first piezoelectric vibrator 11a points to the first friction driving part 12a in the length direction; the eccentric direction of the initial position of the first movable carrier 4221 refers to the direction in which The center of the working path of a movable carrier 4221 points in the direction of the initial position of the first movable carrier 4221. In this way, the first driving part 4222 has a faster driving speed in the eccentric direction of the first friction driving part 12a, so that the first movable carrier 4221 can reach the predetermined position faster, so as to quickly realize the camera module 40 to different positions. Clear shots of subjects at a distance.

In an example of this application, the first driving speed at which the first driving part 4222 drives the first movable carrier 4221 to move in the eccentric direction of the first friction driving part 12a is greater than the first driving speed at which the first driving part 4222 drives the first movable carrier 4221 to move in the eccentric direction of the first friction driving part 12a. A second driving speed for moving the friction driving portion 12a in the eccentric direction.

In an example of this application, after the camera module 40 starts to photograph the subject, the first driving part 4222 drives the first movable carrier 4221 at the first driving speed toward the eccentric direction of the first friction driving part 12a (that is, the first The movable carrier 4221 moves in the opposite direction of the eccentric direction of the initial position for rough adjustment so that the image of the camera module 40 is close to clear. Then, according to the clarity of the image, the first driving part 4222 drives at the first driving speed. Driving the first movable carrier 4221 to move in the eccentric direction of the first friction driving part 12a or driving the first movable carrier 4221 to move in the opposite direction of the eccentric direction of the first friction driving part 12a at the second driving speed for fine adjustment, In order to make the image of the camera module 40 clear. It is worth noting that in actual work, the camera module 40 may reach a clear value after rough adjustment without further fine adjustment. Since the speed of the first driving part 4222 in this application moving toward the eccentric direction of the first friction driving part 12a is relatively large, that is, in this example, the first driving speed is greater than the second driving speed. Therefore, the first possible The moving carrier 4221 can reach the target location at a faster speed.

In a specific example of this application, when the first movable carrier 4221 is set in the initial position, the first movable carrier 4221 is located at one end of the working path of the first movable carrier 4221 that is biased toward the photosensitive component 44 . When the camera module 40 starts to work, the first driving part 4222 drives the first movable carrier 4221 at the first driving speed to move in the direction toward the fixed group 411 for rough adjustment, and then based on the clarity of the imaging, the first The driving part 4222 drives the first movable carrier 4221 to move toward the fixed group 411 at a first driving speed or drives the first movable carrier 4221 to move toward the photosensitive component 44 at a second driving speed for fine adjustment. The direction toward the fixed group 411 is opposite to the direction toward the photosensitive component 44 . In this way, the first movable carrier 4221 can be driven to quickly reach the target position.

In another specific example of this application, when the first movable carrier 4221 is set in the initial position, the first movable carrier 4221 is located at one end of the working path of the first movable carrier 4221 that is biased toward the fixed group 411 . When the camera module 40 starts to work, the first driving part 4222 drives the first movable carrier 4221 at the first driving speed to move in the direction toward the photosensitive component 44 for rough adjustment, and then according to the clarity of the image, the first driving The part 4222 drives the first movable carrier 4221 to move toward the photosensitive component 44 at a first driving speed or drives the first movable carrier 4221 to move toward the fixed group 411 at a second driving speed for fine adjustment. The direction toward the fixed group 411 is opposite to the direction toward the photosensitive component 44 . In this way, the first movable carrier 4221 can be driven to quickly reach the target position.

In yet another specific example of this application, when the first movable carrier 4221 is set in the initial position, the first movable carrier 4221 is not located on the working path of the first movable carrier 4221 and is biased toward the photosensitive component 44 or the fixed group. 411, but is located between the two end points on the working path of the first movable carrier 4221 and not in the middle. When the camera module 40 starts to work, the first driving part 4222 drives the first movable carrier 4221 to move toward the farther end point at the first driving speed or drives the first movable carrier 4221 toward the farther end point at the second driving speed. The closer endpoint moves for rough adjustment, and then depending on the clarity of the imaging, the first driving part 4222 drives the first movable carrier 4221 at the first driving speed to move to the farther endpoint or drives at the second driving speed. The first movable carrier 4221 moves toward the closer endpoint for fine adjustment. In this way, users can obtain a more balanced focusing speed, allowing them to obtain clear images in a shorter time regardless of whether they are shooting distant or close-up shots.

To sum up, in the first embodiment of the camera module 40 described in this application, when the first movable carrier 4221 is set in the initial position, the first movable carrier 4221 is eccentrically located on the first movable carrier On the working path of the first movable carrier 4221, the eccentric direction of the initial position of the first movable carrier 4221 is opposite to the eccentric direction of the first friction driving part 12a. The first driving part 4222 drives the first movable carrier 4221 to move at different speeds in the two opposite directions of the optical axis of the first movable group 412, wherein the first driving part 4222 drives the first movable carrier 4221 to move toward the first The speed at which the friction driving part 12a moves in the eccentric direction (first driving speed) is greater than the speed at which the first driving part 4222 drives the first movable carrier 4221 to move in the opposite direction to the eccentric direction of the first friction driving part 12a (the second driving speed). ). In other words, the first driving part 4222 drives the first movable carrier 4221 to move in the opposite direction to the eccentric direction of the initial position of the first movable carrier 4221. The speed (first driving speed) is greater than the speed (second driving speed) at which the first driving part 4222 drives the first movable carrier 4221 to move in the eccentric direction of the initial position of the first movable carrier 4221 .

The present application further provides a second embodiment of the camera module 40. FIG. 11 illustrates the second embodiment of the camera module 40 of the present application. As shown in Figure 16, compared with the first embodiment, in this embodiment, at least one movable group includes two movable groups (a first movable group 412 and a second movable group 413) , at least one driving component includes two driving components (the first driving component 422 and the second movable group 413). Specifically, the optical lens 41 includes a fixed group 411, a first movable group 412 and a second movable group 413, wherein the first movable group 412 and the second movable group 413 The relative fixed group 411 can be adjusted under the action of the driving device 42 to adjust the optical performance of the camera module 40; the driving device 42 includes a housing 421 and a movably arranged in the housing 421. There is a first driving component 422 and a second driving component 423. The housing 421 includes an upper cover 4211 and a base 4212.

Further, the second movable group 413 includes a second movable lens barrel 4131 and at least one second movable lens 4132 accommodated in the second movable lens barrel 4131. The second movable group 413 An optical axis is provided. Wherein, the second movable group 413 is adapted to be driven by the driving device 42 to move along the optical axis direction set by the second movable group 413, thereby realizing the focal length adjustment of the optical lens 41, so that The camera module 40 can achieve clear photography of subjects at different distances. It is worth mentioning that in other examples of this application, the second movable group 413 may not be provided with the second movable lens barrel 4131, and may only include at least one second movable lens 4132. For example, it may only include One second movable lens 4132 or only includes multiple second movable lenses 4132 that are fitted to each other. That is, in other examples of this application, the second movable group 413 can also be implemented as a "naked lens".

In this embodiment, the fixed group 411, the first movable group 412 and the second movable group 413 are arranged sequentially along the optical axis direction of the optical lens 41. In other words, the first movable group 412 is arranged on between the fixed group 411 and the second movable group 413. In one example, the first movable group 412 may be a zoom group, and the second movable group 413 may be a focus group. The first movable group 412 is driven to move to achieve optical zoom, and the second movable group 413 is driven to move. The movable group 413 moves to achieve optical focusing; in another example of the present application, the first movable group 412 can be a focus group, and the second movable group 413 can be a zoom group. By driving the first movable group 413 The group 412 moves to achieve optical focusing, and the second movable group 413 is driven to move to achieve optical zoom.

The second driving component 423 is disposed together with the first driving component 422 in the accommodation cavity formed by the mutual interlocking of the upper cover 4211 and the base 4212. The second driving component 423 includes a second movable carrier 4231 and a second driving part. 4232 and a second pre-pressure component 4233. Specifically, in this embodiment, the second driving part 4232 is implemented as the piezoelectric actuator 10 as shown in FIGS. 1A to 8 , and the second movable group 413 is installed on the second movable carrier. 4231, wherein the second driving element is configured to drive the second movable carrier 4231 to drive the second movable group 413 to move along the direction set by the optical axis of the second movable group 413. It should be noted that in this application, the structure and characteristics of the second driving part 4232 are the same as the piezoelectric actuator 10 shown in FIGS. 1A to 8 . The piezoelectric actuator 10 shown in FIGS. 1A to 8 It can be fully applied to the second driving part 4232 described in this application. It is worth noting that in this embodiment, although both the second driving part 4232 and the first driving part 4222 can be implemented as the piezoelectric actuator 10 illustrated in FIGS. 1A to 8 , it is easy to imagine that the second driving part 4232 can be implemented as the piezoelectric actuator 10 illustrated in FIGS. 1A to 8 The parameter specifications of the driving part 4232 and the first driving part 4222 may be different, and may be designed according to the space reserved in the driving device 42 and the requirements for driving force and driving speed.

The second driving part 4232 includes a second piezoelectric vibrator 11b and a second friction driving part 12b driveably connected to the second piezoelectric vibrator 11b. After the second driving part 4232 is turned on, the second friction driving part 4232 is turned on. The portion 12b is configured to provide a driving force for driving the first movable carrier 4221 under the action of the second piezoelectric vibrator 11b. The second movable carrier 4231 is movably provided in the housing 421 .

1A to 8 , the second friction driving part 12 b is fixed to the front surface of the second piezoelectric vibrator 11 b (that is, the second piezoelectric vibrator 11 b ) along the thickness direction (that is, the Y-axis direction shown in FIG. 1A ). the first side surface of the piezoelectric vibrator 11b). In one example, the second friction driving part 12b is eccentrically arranged on the front surface of the second piezoelectric vibrator 11b (that is, the first side surface of the second piezoelectric vibrator 11b) along the length direction of the second piezoelectric vibrator 11b, and In a specific example, the second friction driving part 12b is located between a quarter and a half of the length direction of the second piezoelectric vibrator 11b.

The second driving part 4232 is frictionally coupled to the second movable carrier 4231 through the second pre-pressure component 4233 and is configured to drive the second movable carrier 4231 and the second movable group 413 mounted thereon along the first The optical axes of the two movable groups 413 move in two opposite directions respectively. The second pre-pressure component 4233 is clamped between the base 4212 of the housing 421 and the second driving part 4232. The second pre-pressure component 4233 provides the pressure of the second driving part 4232 toward the second movable carrier 4231, so as to The second friction driving part 12b of the second driving part 4232 is kept in contact with the second movable carrier 4231, and then the second friction driving part 12b and the second movable carrier 4231 are in contact with each other. Frictional contact. In a specific example, the second pre-pressure component 4233 may be implemented as a spring piece, and the second pre-pressure component 4233 is fixed between the base 4212 and the second driving part 4232.

In an example of this application, the second movable carrier 4231 includes a second carrier body 42311 and a second friction part 42312. The second movable group 413 is installed in the second carrier body 42311, the second friction part 42312 is provided between the second carrier body 42311 and the second driving part 4232, and the second friction driving part of the second driving part 4232 The portion 12b resists the second friction portion 42312 under the action of the second pre-pressure component 4233. In this way, the friction driving force provided by the second driving portion 4232 can act on the second carrier body 42311 through the second friction portion 42312. To drive the second carrier body 42311 to move.

In an example of this application, the second friction part 42312, the second driving part 4232 and the second pre-pressure component 4233 are all disposed on the side of the second carrier body 42311. Specifically, the second carrier body 42311 has a U-shaped cross section, the second movable carrier 4231 is installed in the second carrier body 42311 from the opening along the height direction, and the second friction part 42312 is provided on the side of the second carrier body 42311 , correspondingly, the second driving part 4232 and the second pre-pressure component 4233 are provided on the same side, wherein the second pre-pressure component 4233 is fixed to the base 4212 and is opposite to the side of the second carrier body 42311 where the second friction part 42312 is provided. corresponding side.

It is worth mentioning that although in the example shown in Figure 11, the second friction part 42312 is provided as a separate component between the second driving part 4232 and the second carrier body 42311, it should be understood that in this In other examples of the application, the second friction part 42312 can also be integrally formed on the side surface of the second carrier body 42311. For example, the second friction part 42312 serves as a friction coating coated on the side surface of the second carrier body 42311. In this regard , is not limited by this application. The second friction part 42312 may be made of a material with better friction performance and durability, for example, it may be made of a metal oxide material (for example, zirconia, alumina, etc.).

In an example of this application, the first guide rod 42411 of the first guide device 4241 further penetrates the second movable carrier 4231, and the first guide rod 42411 is parallel to the optical axis of the second movable group 413. In this way, The second movable carrier 4231 is also moved along the first guide rod 42411, so that the second movable carrier 4231 can be guided to move along the direction of the optical axis of the second movable group 413.

In another example of the present application, the guide device 424 further includes a second guide device 4242, so that the first movable carrier 4221 and the second movable carrier can be guided through the first guide device 4241 and the second guide device respectively. When the carrier 4231 moves, the second guide device 4242 may be disposed on the same side of the driving device 42 as the first guide device 4241, or may be disposed on opposite sides. Specifically, the driving device 42 also includes a second guide device 4242 configured to guide the movement of the second movable carrier 4231. The second guide device 4242 includes two second guide devices 4242 spaced apart from the base 4212 of the housing 421. The fixed part 42422 and the second guide rod 42421 installed between the two second fixed parts 42422 and penetrating the second movable carrier 4231, the second guide rod 42421 is parallel to the optical axis of the second movable group 413, so that The second movable carrier 4231 can be guided to move in a direction parallel to the optical axis of the second movable group 413 .

In this application, the second driving part 4232 is elongated, and its length direction is consistent with the optical axis direction of the second movable group 413. In this application, because the second driving part 4232 described in this application has The two friction driving parts 12b are eccentrically arranged on the second side of the second piezoelectric oscillator 11b along the length direction of the second piezoelectric oscillator 11b, and since the vibration frequency and bending amplitude of the second piezoelectric oscillator 11b are in two It is not the same in the bending mode. The second driving part 4232 implemented as the piezoelectric actuator 10 described in the present application drives the second movable carrier 4231 along two opposite directions of the optical axis of the second movable group 413 Movements do not move at the same speed. Therefore, the second movable carrier 4231 can be eccentrically arranged between the fixed group 411 and the photosensitive component 44, so that the property of the second driving part 4232 having different speeds in two opposite directions can be reasonably utilized.

The second movable carrier 4231 has a working path, and the second movable carrier 4231 moves on the working path driven by the second driving part 4232 to adjust the optical performance of the camera module 40 (for example, to achieve optical zoom or optical focus functions). ). Furthermore, the second movable carrier 4231 also has an initial position. The initial position of the second movable carrier 4231 refers to the position of the second movable carrier 4231 on the working path when the driving device 42 or the camera module 40 just enters the working state. The position, in other words, is the position where the second movable carrier 4231 is located when the driving device 42 or the camera module 40 is in the initial state.

In an example of this application, when the second movable carrier 4231 is set to the initial position, the second movable carrier 4231 is eccentrically located on the working path of the second movable carrier 4231, and the initial position of the second movable carrier 4231 The eccentric direction of the second friction drive portion 12b is opposite to the eccentric direction of the second friction drive portion 12b. The eccentric direction of the second friction driving part 12b refers to the direction in which the center of the second piezoelectric vibrator 11b points to the second friction driving part 12b in the length direction; the eccentric direction of the initial position of the second movable carrier 4231 refers to the direction in which the center of the second piezoelectric vibrator 11b points to the second friction driving part 12b. The center of the working path of the two movable carriers 4231 points in the direction of the initial position of the second movable carrier 4231. In this way, the second driving part 4232 has a faster driving speed in the eccentric direction of the second friction driving part 12b, so that the second movable carrier 4231 can reach the predetermined position faster. This enables the camera module 40 to quickly take clear shots of subjects at different distances.

It is worth noting that the eccentric direction of the initial position of the second movable carrier 4231 and the eccentric direction of the initial position of the first movable carrier 4221 may be the same or different. When the eccentric direction of the initial position of the second movable carrier 4231 is different from the eccentric direction of the initial position of the first movable carrier 4221, the first movable carrier 4221 and the second movable carrier 4231 are in opposite directions when the driving device 42 is working. Move; when the eccentric direction of the initial position of the second movable carrier 4231 is the same as the eccentric direction of the initial position of the first movable carrier 4221, the first movable carrier 4221 and the second movable carrier 4231 operate when the driving device 42 By moving in the same direction, the internal space of the drive assembly can be fully utilized and the size of the drive assembly can be shortened.

In an example of this application, the third driving speed at which the second driving part 4232 drives the second movable carrier 4231 to move in the eccentric direction of the second friction driving part 12b is greater than the third driving speed at which the second driving part 4232 drives the second movable carrier 4231 to move in the eccentric direction of the second friction driving part 12b. The second friction driving part 12b moves in the eccentric direction at a fourth driving speed.

In an example of this application, when the camera module 40 starts to photograph the subject, the second driving part 4232 drives the second movable carrier 4231 at the third driving speed toward the eccentric direction of the second friction driving part 12b (that is, the third The second movable carrier 4231 moves in the opposite direction of the eccentric direction of the initial position for rough adjustment so that the imaging of the camera module 40 is close to clear, and then based on the clarity of the imaging, the second driving part 4232 drives at a third driving speed Driving the second movable carrier 4231 to move in the eccentric direction of the second friction driving part 12b or driving the second movable carrier 4231 to move in the opposite direction of the eccentric direction of the second friction driving part 12b at the fourth driving speed for fine adjustment, In order to make the image of the camera module 40 clear. It is worth noting that in actual work, the camera module 40 may reach a clear value after rough adjustment without further fine adjustment. Since the speed of the second driving part 4232 in the present application moving toward the eccentric direction of the second friction driving part 12b is relatively large, that is, in this example, the third driving speed is greater than the fourth driving speed. Therefore, the second possible The moving carrier 4231 can reach the target location at a faster speed.

In a specific example of this application, when the second movable carrier 4231 is set in the initial position, the second movable carrier 4231 is located at one end of the working path of the second movable carrier 4231 that is biased toward the photosensitive component 44 . When the camera module 40 starts to work, the second driving part 4232 drives the second movable carrier 4231 at the third driving speed to move in the direction toward the fixed group 411 for rough adjustment, and then based on the clarity of the imaging, the second The driving part 4232 drives the second movable carrier 4231 to move toward the fixed group 411 at a third driving speed or drives the second movable carrier 4231 to move toward the photosensitive component 44 at a fourth driving speed for fine adjustment. The direction toward the fixed group 411 is opposite to the direction toward the photosensitive component 44 . In this way, the second movable carrier 4231 can be driven to quickly reach the target position.

In another specific example of this application, when the second movable carrier 4231 is set in the initial position, the second movable carrier 4231 is located at one end of the working path of the second movable carrier 4231 that is biased toward the fixed group 411 . When the camera module 40 starts to work, the second driving part 4232 drives the second movable carrier 4231 at the third driving speed to move toward the photosensitive component 44 for rough adjustment, and then according to the clarity of the image, the second driving The part 4232 drives the second movable carrier 4231 to move toward the photosensitive component 44 at a third driving speed or drives the second movable carrier 4231 to move toward the fixed group 411 at a fourth driving speed for fine adjustment. The direction toward the fixed group 411 is opposite to the direction toward the photosensitive component 44 . In this way, the second movable carrier 4231 can be driven to quickly reach the target position.

In yet another specific example of this application, when the second movable carrier 4231 is set in the initial position, the second movable carrier 4231 is not located on the working path of the second movable carrier 4231 and is biased toward the photosensitive component 44 or the fixed group. 411, but is located between the two end points on the working path of the second movable carrier 4231 and not in the middle. When the camera module 40 starts to work, the second driving part 4232 drives the second movable carrier 4231 at the third driving speed to move toward the farther end point or drives the second movable carrier 4231 at the fourth driving speed toward the farther end point. The closer endpoint moves for rough adjustment, and then, depending on the clarity of the imaging, the first driving part 4222 drives the second movable carrier 4231 at the third driving speed to move to the farther endpoint or drives at the fourth driving speed. The second movable carrier 4231 moves toward the closer endpoint for fine adjustment. In this way, users can obtain a more balanced focusing speed, allowing them to obtain clear images in a shorter time regardless of whether they are shooting distant or close-up shots.

To sum up, in the second embodiment of the camera module 40 described in this application, when the second movable carrier 4231 is set in the initial position, the second movable carrier 4231 is eccentrically located on the second movable carrier On the working path of the second movable carrier 4231, the eccentric direction of the initial position of the second movable carrier 4231 is opposite to the eccentric direction of the second friction driving part 12b. The second driving part 4232 drives the second movable carrier 4231 to move at different speeds in the two opposite directions of the optical axis of the second movable group 413, wherein the second driving part 4232 drives the second movable carrier The speed at which the body 4231 moves in the eccentric direction of the second friction driving part 12b (third driving speed) is greater than the speed at which the second driving part 4232 drives the second movable carrier 4231 to move in the opposite direction to the eccentric direction of the second friction driving part 12b. (4th drive speed). In other words, the speed at which the second driving part 4232 drives the second movable carrier 4231 to move in the opposite direction to the eccentric direction of the initial position of the second movable carrier 4231 (the third driving speed) is greater than the speed at which the second driving part 4232 drives the second movable carrier 4231 . The speed at which the carrier 4231 moves toward the eccentric direction of the initial position of the second movable carrier 4231 (the fourth driving speed).

The present application further provides a third embodiment of the camera module 40. FIG. 17 illustrates the third embodiment of the camera module 40 of the present application. As shown in Figure 17, compared with the second embodiment, in this embodiment, the second driving component 423 is disposed in the first driving component 422, and the second movable carrier 4231 is movably disposed in the first movable carrier. in moving carrier 4221. Specifically, the second pre-pressure component 4233 is clamped and disposed between the first movable carrier 4221 and the second driving part 4232, and the second pre-pressure component 4233 provides the second driving part 4232 with a force toward the second movable carrier 4231. Pressure is applied to keep the second friction driving part 12b of the second driving part 4232 in contact with the second movable carrier 4231, and then the second friction driving part 12b is in frictional contact with the second movable carrier 4231. The second driving part 4232 is frictionally coupled to the second movable carrier 4231 through the second pre-pressure component 4233 and is configured to drive the second movable carrier 4231 and the second movable group 413 mounted thereon along the first The optical axes of the two movable groups 413 move in two opposite directions respectively.

In this embodiment, the guide device 424 includes a first guide device 4241 and a second guide device 4242. The first guide device 4241 includes two first fixing parts spaced apart from the base 4212 of the housing 421. 42412 and the first guide rod 42411 installed between the two first fixed parts 42412 and penetrating the first movable carrier 4221. The first guide rod 42411 is parallel to the optical axis of the first movable group 412, so that the first The movable carrier 4221 can be guided to move in a direction parallel to the optical axis of the first movable group 412; the second guiding device 4242 includes two second guides spaced apart from the first movable carrier 4221. The fixed part 42422 and the second guide rod 42421 installed between the two second fixed parts 42422 and penetrating the second movable carrier 4231. The second guide rod 42421 is parallel to the optical axis of the second movable group 413, so that The second movable carrier 4231 can be guided to move in a direction parallel to the optical axis of the second movable group 413 . In one example, the first guiding device 4241 and the second guiding device 4242 are respectively disposed on both sides of the driving device 42, and the first driving part 4222 and the second driving part 4232 are also respectively disposed on both sides of the driving device 42. side.

It is worth mentioning that in this application, the camera module 40 can include more fixed groups 411 and more movable groups, and the fixed group 411 can also be set between two movable groups. Applications are not limited to this.

It is worth mentioning that in this application, the driving device 32 may further include an optical axis for maintaining the fixed group 411 and at least one movable group (the first movable group 412 and the second movable group 413), a position sensing component for obtaining position information of at least one movable group (the first movable group 412 and the second movable group 413), and a An electrical connection component for driving power is provided for at least one driving part (the first driving part 4222 and the second driving part 4232). Among them, the suspension component can use common methods such as springs, balls, sliders, etc.; the position sensing component can be composed of Hall elements and magnets; the electrical connection component can use embedded conductive, soft board (FPC) or soft and hard combination The board is electrically connected.

The above describes the basic principles, main features and advantages of the present application. Those skilled in the industry should understand that the present application is not limited by the above-mentioned embodiments. What is described in the above-mentioned embodiments and descriptions is only the principle of the present application. The present application will have various applications without departing from the spirit and scope of the present application. changes and improvements that fall within the scope of the claimed application. The scope of protection claimed in this application is defined by the appended claims and their equivalents.

Claims

A piezoelectric actuator, characterized by including:

A piezoelectric vibrator, the piezoelectric vibrator includes a front surface and a back surface arranged oppositely along the thickness direction; and

The friction driving part is fixed to the front surface of the piezoelectric oscillator along the thickness direction, wherein the friction driving part is eccentrically arranged on the front surface of the piezoelectric oscillator along the length direction.
The piezoelectric actuator according to claim 1, wherein the piezoelectric vibrator includes two bending modes: a first bending mode and a second bending mode, and the piezoelectric vibrator vibrates in the two bending modes, Thereby, the piezoelectric actuator drives the driven object to move in two opposite directions, the first direction and the second direction respectively in the two bending modes.
The piezoelectric actuator according to claim 2, wherein in the first bending mode, the piezoelectric vibrator bends and vibrates in a mode of a peak or a valley in its thickness direction; In the second bending mode, the piezoelectric vibrator bends and vibrates in a mode of one peak and one valley in its thickness direction.
The piezoelectric actuator according to claim 3, wherein the piezoelectric vibrator includes a first bending part and a second bending part connected in series along the length direction, the first bending part being located below the friction driving part , in the first bending mode, the first bending part and the second bending part are axially symmetrical with each other; in the second bending mode, the first bending part and the second bending part are axially symmetrical with each other. rotational symmetry.
The piezoelectric actuator according to claim 3, wherein the speed at which the piezoelectric actuator drives the driven object to move in the first direction is greater than the speed at which the piezoelectric actuator drives the driven object to move in the second direction. The first direction refers to the eccentric direction of the friction driving part, and the eccentric direction of the friction driving part is the direction in which the center of the piezoelectric vibrator points to the friction driving part in the length direction.
The piezoelectric actuator according to claim 2, wherein the piezoelectric vibrator includes a plurality of ceramic layers, a plurality of electrode layers spaced between adjacent ceramic layers, and a plurality of electrode layers. The side electrical conductive portion is electrically connected to the electrode layer.
The piezoelectric actuator according to claim 6, wherein the plurality of electrode layers includes at least a first electrode layer, at least a second electrode layer, at least a third electrode layer and at least a fourth electrode layer, The side electrical conductive portion includes a first side electrical connection portion, a second side electrical connection portion, a third side electrical connection portion and a fourth side electrical connection portion, and the first side electrical connection portion is connected to at least one of the first side electrical connections. The electrode layers are electrically connected, the second side electrical connecting part is electrically connected to at least one of the second electrode layers, the third side electrical connecting part is electrically connected to at least one of the third electrode layers, and the fourth side The electrical connection part is electrically connected to at least one of the fourth electrode layers.
The piezoelectric actuator according to claim 7, wherein at least one of the first electrode layer and at least one of the second electrode layer are arranged symmetrically with respect to the width direction of the piezoelectric vibrator, and at least one of the third electrode layer The electrode layer and at least one fourth electrode layer are arranged symmetrically with respect to the length direction of the piezoelectric vibrator.
The piezoelectric actuator according to any one of claims 1 to 8, wherein the friction driving portion is located between a quarter and a half of the length direction of the piezoelectric vibrator.
A drive motor set, characterized by including:

The piezoelectric actuator according to any one of claims 1 to 9;

stator;

mover; and

Pre-pressure component, wherein the piezoelectric actuator is fixed to the stator through the pre-pressure component, and the piezoelectric actuator is frictionally coupled to the mover through the pre-pressure component and is It is configured to drive the mover to move along the length direction.
A driving device, characterized in that it includes:

fixed part;

A movable part, the movable part is movably provided in the fixed part; and

A driving part, the driving part is provided between the fixed part and the movable part, the driving part drives the movable part to move in a first direction or a second direction, and the first direction is consistent with the movable part. The second direction is opposite, wherein the speed at which the driving part drives the movable part to move in the first direction is greater than the speed at which the driving part drives the movable part to move in the second direction.
The driving device according to claim 11, wherein the driving part includes a piezoelectric oscillator and a friction driving part fixed to the piezoelectric oscillator, and the friction driving part is eccentrically disposed on the piezoelectric oscillator in the height direction. On the vibrator.
The driving device according to claim 12, wherein the piezoelectric vibrator includes two bending modes: a first bending mode and a second bending mode, and the driving part drives the movable oscillator in the two bending modes respectively. The part moves in the first direction or the second direction.
The driving device according to claim 13, wherein the distance from the friction driving part to the top end of the piezoelectric oscillator is smaller than the distance from the friction driving part to the bottom end of the piezoelectric oscillator in the height direction.
The driving device according to claim 14, wherein the movable part includes a movable carrier and a friction plate, the friction plate is clamped between the movable carrier and the friction driving part, and the friction plate The driving part is frictionally coupled to the friction plate.
The driving device according to claim 15, wherein the distance from the friction driving part to the top end of the friction plate is smaller than the distance from the friction driving part to the bottom end of the friction plate in the height direction.
The driving device according to claim 16, wherein the driving device further includes a pre-pressure component disposed between the fixed part and the driving part, and the pre-pressure component generated by the pre-pressure component The pressure keeps frictional contact between the friction driving part and the friction plate.
The driving device according to claim 17, wherein the pre-pressure component includes two fixed ends and a connecting section integrally connected between the two fixed ends, the two fixed ends are fixed to the fixed part, and the There is a certain gap between the connecting section and the fixed part, and the piezoelectric vibrator is disposed on a side of the connecting section away from the fixed part.
The driving device according to claim 18, wherein the driving device further includes a guide device, the guide device is provided between the fixed part and the movable part, the movable part is clamped held between the pre-pressure component and the guide device.
A camera module, characterized by including:

optical lenses;

A photosensitive component, the optical lens is held on the photosensitive path of the photosensitive component; and

The driving device according to any one of claims 11 to 19, wherein the optical lens is mounted on the movable portion of the driving device.
A camera module, characterized by including:

Optical lens, the optical lens includes a fixed group and a first movable group;

Driving device, the driving device includes a housing and a first driving component disposed in the housing, the fixed group is fixed to the housing, the first driving component includes a first movable carrier , a first driving part and a first pre-pressure component, the first movable group is installed in the first movable carrier, the first drive part is frictionally coupled through the first pre-pressure component on the first movable carrier; and

A photosensitive component held on the light path of the optical lens, wherein the first driving part includes a first piezoelectric oscillator and a third piezoelectric oscillator that is eccentric along the length direction and is disposed on the front surface of the first piezoelectric oscillator. A friction driving part, when the first movable carrier is set in the initial position, the first movable carrier is eccentrically located on the working path of the first movable carrier, and the first movable carrier The eccentric direction of the initial position is opposite to the eccentric direction of the first friction drive part.
The camera module according to claim 21, wherein the first driving speed of the first driving part driving the first movable carrier to move in the eccentric direction of the first friction driving part is greater than the first driving speed. A second driving speed at which the first friction driving portion drives the first movable carrier to move in an eccentric direction of the first friction driving portion.
The camera module according to claim 22, wherein the first driving part drives the first movable carrier to move in the eccentric direction of the first friction driving part at the first driving speed for rough adjustment. , so that the imaging of the camera module is close to clear, and then according to the clarity of the imaging, the first driving part drives the first movable carrier toward the first friction driving part at the first driving speed. to move in the eccentric direction or drive the first movable carrier to move in the opposite direction of the eccentric direction of the first friction driving part at the second driving speed for fine adjustment.
The camera module according to claim 23, wherein when the first movable carrier is set in the initial position, the first movable carrier is located on the working path of the first movable carrier and is biased toward the At one end of the photosensitive component, the first driving part drives the first movable carrier to move in the direction toward the fixed group at the first driving speed for rough adjustment, and then based on the clarity of the image, the The first driving part drives the first movable carrier to move toward the fixed group at the first driving speed or drives the first movable carrier toward the fixed group at the second driving speed. The direction of the photosensitive element moves for fine adjustments.
The camera module according to claim 21, wherein the first driving part is elongated, and its length direction is consistent with the optical axis direction of the first movable group.
The camera module of claim 21, wherein the driving device further includes a first guide device configured to guide the movement of the first movable carrier, the first guide device and the first The driving parts are respectively arranged on the first Both sides of a movable carrier.
The camera module according to any one of claims 21 to 26, wherein the optical lens further includes a second movable group, and the driving device further includes a second movably disposed in the housing. Driving assembly, the second driving assembly includes a second movable carrier, a second driving part and a second pre-pressure component, the second movable group is installed in the second movable carrier, the third Two driving parts are frictionally coupled to the second movable carrier through the second pre-pressure component. The second driving part includes a second piezoelectric oscillator and an eccentrically arranged second piezoelectric vibrator along the length direction. The second friction driving part on the front side of the electric vibrator, when the second movable carrier is set in the initial position, the second movable carrier is eccentrically located on the working path of the second movable carrier, and the The eccentric direction of the initial position of the second movable carrier is opposite to the eccentric direction of the second friction drive part.
The camera module according to claim 27, wherein the eccentric direction of the initial position of the second movable carrier is the same as the eccentric direction of the initial position of the first movable carrier.
The camera module according to claim 27, wherein the second driving component is disposed in the first driving component, and the second pre-pressure component is clamped and disposed on the first movable carrier and the second driving part.
The camera module according to claim 27, wherein the camera module further comprises a light turning component, the light turning component is fixed to the driving component and used to turn imaging light.