CN217932225U

CN217932225U - Lens module, camera module and electronic equipment

Info

Publication number: CN217932225U
Application number: CN202221891928.XU
Authority: CN
Inventors: 李东
Original assignee: Shenzhen Jsl Electronics Ltd
Current assignee: Shenzhen Jsl Electronics Ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2022-11-29
Anticipated expiration: 2032-07-21

Abstract

The utility model relates to a camera lens module, camera module and electronic equipment. The lens module comprises a shell, an inner frame, a first actuating assembly, a lens assembly and a second actuating assembly, wherein the shell comprises the outer frame; the inner frame is movably arranged in the outer frame and moves along a first direction; the first actuating combination is connected between the outer frame and the inner frame and comprises at least one first piezoelectric actuator, and the first actuating combination can drive the inner frame to move; the lens component is movably arranged in the inner frame and moves along a second direction; the second actuating combination is connected between the inner frame and the lens assembly and comprises at least one second piezoelectric actuator, and the second actuating combination can drive the lens assembly to move; the first direction, the second direction and the optical axis direction of the lens component are mutually perpendicular. The lens module improves the stability of optical anti-shake performance, and further improves the reliability of the shooting function of the electronic equipment.

Description

Lens module, camera module and electronic equipment

Technical Field

The utility model relates to an electronic product technical field especially relates to a camera lens module, camera module and electronic equipment.

Background

With the development of multi-functionalization of various electronic products, the camera function becomes a standard configuration of many electronic products, such as smart phones, tablet computers, and the like having the camera function. In application scenes such as photographing and video, it is often necessary to change the focal position of a camera or a lens to achieve Auto Focus (AF) and Optical Image Stabilization (OIS) for improving imaging quality.

The automatic focusing is realized by utilizing the principle of object light reflection, imaging and receiving the reflected light on an image sensor after passing through a lens, obtaining the object distance of an object through computer processing, and then automatically moving the lens according to the object distance to finish focusing.

The optical anti-shake is to avoid or reduce the shake phenomenon of the device during capturing optical signals by setting optical components, such as a lens, in the imaging device, so as to improve the imaging quality. It is common practice to perform shake detection by a gyroscope and then to translate or rotate the entire lens in the opposite direction by an OIS motor to compensate for image blur caused by shaking of the imaging device during exposure.

The VCM is the most widely used in auto focus and optical anti-shake, and is also called a Voice Coil Motor (VCM), which is one of motors. Because the principle is similar to that of a loudspeaker, the voice coil motor is called as a voice coil motor and has the characteristics of high frequency response and high precision. The main principle of the voice coil motor is that in a permanent magnetic field, the extension position of a spring piece is controlled by changing the direct current of a coil in the motor, so that the spring piece is driven to move up and down. The mobile phone camera widely uses the voice coil motor to realize the automatic focusing function, and the position of the lens can be adjusted through the voice coil motor to present clear images.

For the optical anti-shake function, the micro movement can be detected through a gyroscope in the lens, then a signal is transmitted to a microprocessor, the microprocessor immediately calculates the displacement required to be compensated, and then compensation is carried out through a compensation lens group according to the shake direction and the displacement of the lens; thereby effectively overcoming the image blur caused by the vibration of the camera. Among them, the most commonly used is the suspension wire structure, and the suspension wire in the suspension wire structure is one of the most vulnerable components in the voice coil motor, so the stability of optical anti-shake using the voice coil motor needs to be improved.

SUMMERY OF THE UTILITY MODEL

Therefore, the lens module is provided, and aims to improve the stability of the optical anti-shake performance and improve the reliability of the shooting function of the electronic equipment.

A lens module, comprising:

a housing comprising an outer frame;

the inner frame is movably arranged in the outer frame and moves along a first direction;

the first actuating combination is connected between the outer frame and the inner frame and comprises at least one first piezoelectric actuator, and the first actuating combination can drive the inner frame to move;

the lens assembly can be movably arranged in the inner frame and can move along a second direction; and

a second actuation assembly coupled between the inner frame and the lens assembly and including at least a second piezoelectric actuator, the second actuation assembly being configured to drive movement of the lens assembly;

the first direction, the second direction and the optical axis direction of the lens assembly are arranged in a pairwise mode and are perpendicular to each other.

In one embodiment, the outer frame is provided with a first guide portion, and the inner frame is provided with a second guide portion which is connected with the first guide portion in a guiding manner and can move along the first direction.

In one embodiment, the outer frame comprises two opposite outer edge parts, the first guide part is arranged on one outer edge part, and the first actuating assembly is connected with the inner side of the other outer edge part; the inner frame comprises two opposite inner edge parts, the second guide part is arranged on one inner edge part, and the first actuating assembly is connected with the outer side of the other inner edge part.

In one embodiment, the inner frame is provided with a third guide portion, and the lens assembly is provided with a fourth guide portion which is connected with the third guide portion in a guiding manner and can move along the second direction in a guiding manner.

In one embodiment, the inner frame further comprises two opposite connecting edges, each connecting edge is connected between two of the inner edges, the third guide portion is arranged on one of the connecting edges, and the second actuating assembly is connected with the inner side of the other connecting edge; the lens assembly is provided with two opposite connecting surfaces, the fourth guide part is arranged on one connecting surface, and the second actuating assembly is connected with the other connecting surface.

In one embodiment, the first actuation assembly includes two of the first piezoelectric actuators arranged in series, and the second actuation assembly includes two of the second piezoelectric actuators arranged in series.

In one embodiment, the lens assembly includes:

the displacement amplification mechanism comprises two opposite connecting pieces and two opposite displacement amplification pieces, each displacement amplification piece is connected between the two connecting pieces, and a through hole is formed in each displacement amplification piece;

a third piezoelectric actuator, one of the third piezoelectric actuators is connected with the inner side surface of one of the connecting pieces, and the other of the third piezoelectric actuators is connected with the inner side surface of the other of the connecting pieces; and

the lens module is connected between the two third piezoelectric actuators and comprises a lens base which can move along the direction of the optical axis, and the lens base is connected with the displacement amplification piece and extends out of the through hole;

the lens module and all the third piezoelectric actuators between the two connecting pieces can drive the two connecting pieces to move in the first direction in a face-to-face or back-to-back mode, and the displacement amplifying pieces are linked to move in a telescopic mode so as to drive the lens base to move in the optical axis direction.

In one embodiment, each of the first piezoelectric actuator, the second piezoelectric actuator and the third piezoelectric actuator includes a piezoelectric deformation sheet and two elastic clamping sheets, the piezoelectric deformation sheet is located between the two elastic clamping sheets, two ends of each elastic clamping sheet are connected with two ends of the piezoelectric deformation sheet in a one-to-one correspondence manner, and each elastic clamping sheet is arched from two ends to the middle; wherein, the lateral surface of elasticity clamping piece is used for connecting.

In one embodiment, the displacement amplification piece is arranged from two sides to the middle in an arched manner from inside to outside, and the two sides are two sides connected with the connecting piece; the displacement amplification piece comprises a middle part positioned between the two sides, and the middle part is provided with a connecting part which is connected with the microscope base.

In one embodiment, the lens module further includes:

the guide ring is provided with two opposite side parts, the two side parts of the guide ring are connected between the two third piezoelectric actuators, and one end of the mirror base is connected with the guide ring and can move along the guide ring in a guiding mode.

In one embodiment, the lens module further includes:

and one end of the fixing ring is connected with the guide ring and can be guided to move along the guide ring, and the other end of the fixing ring is connected with the other displacement amplification piece.

In one embodiment, one end of the fixing ring is provided with a sliding groove, and the sliding groove is sleeved with one end of the guide ring and is arranged on two side parts of the guide ring in a clearance manner.

The camera module comprises a base, wherein the base comprises an image sensor, the camera module further comprises a lens module, and the lens module corresponds to the image sensor of the base.

An electronic device, comprising:

a camera module; and

the power supply module is electrically connected with the camera module;

the camera module is as above, and the power supply module is electrically connected with the piezoelectric actuator of the camera module and supplies power to the piezoelectric actuator.

According to the lens module, the first actuating combined driving inner frame and the lens assembly in the first actuating combined driving inner frame move along the first direction, the second actuating combined driving lens assembly moves along the second direction, the lens assembly is controlled to move in the first direction and the second direction, the displacement is compensated, the influence of shaking on imaging is eliminated, and optical anti-shaking is achieved. The first actuating combination plays a driving role through electrostriction of the first piezoelectric actuator, the second actuating combination also plays a driving role through electrostriction of the second piezoelectric actuator, and the electrostriction performance of the piezoelectric actuator is stable, so that the stability of the optical anti-shake performance of the lens module is improved, and the reliability of the shooting function of the electronic equipment is further improved. In addition, the displacement of the lens assembly in the first direction and the second direction is independently controlled by the first actuating combination and the second actuating combination respectively, namely, the displacement required to be compensated in the first direction and the displacement required to be compensated in the second direction are obtained by calculation, and then the first actuating combination and the second actuating combination are controlled respectively to compensate the displacements, so that the optical anti-shake can be realized, and the algorithm is simplified.

Drawings

Fig. 1 is a schematic structural diagram of a lens module according to an embodiment of the present invention;

FIG. 2 is a schematic view of another view angle of the lens module shown in FIG. 1;

FIG. 3 is an exploded view of the lens module shown in FIG. 1;

FIG. 4 is a schematic structural diagram of a piezoelectric actuator of the lens module shown in FIG. 3;

FIG. 5 is a schematic diagram of the operation of the piezoelectric actuator of FIG. 4;

FIG. 6 is a schematic view of a view angle of a lens assembly of the lens module shown in FIG. 3;

FIG. 7 is a schematic view of another view angle of the lens assembly of the lens module shown in FIG. 3;

FIG. 8 is an exploded view of the lens assembly of FIG. 6;

FIG. 9 is a schematic diagram of the displacement magnification mechanism of the lens assembly of FIG. 8;

fig. 10 is a schematic diagram of a camera module according to an embodiment of the present invention;

fig. 11 is a block diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Referring to fig. 1 to 3, fig. 1 shows a schematic structural diagram of a lens module according to an embodiment of the present invention, fig. 2 shows a schematic structural diagram of another viewing angle of the lens module in fig. 1, and fig. 3 shows an exploded view of the lens module in fig. 1, an embodiment of the present invention provides a lens module 100, which includes a housing 200, an inner frame 300, a first actuating assembly 400, a lens assembly 500, and a second actuating assembly 600. The housing 200 includes an outer frame 210. The inner frame 300 is movably disposed in the outer frame 210 and moves along a first direction. The first actuator assembly 400 is connected between the outer frame 210 and the inner frame 300 and includes at least one first piezoelectric actuator 410, and the first actuator assembly 400 is capable of driving the inner frame 300 to move. The lens assembly 500 can be movably disposed in the inner frame 300 and can move along a second direction. The second actuating assembly 600 is connected between the inner frame 300 and the lens assembly 500 and includes at least one second piezoelectric actuator 610, and the second actuating assembly 600 can drive the lens assembly 500 to move. The first direction, the second direction, and the optical axis direction of the lens assembly 500 are perpendicular to each other.

The lens module 100 drives the inner frame 300 and the lens assembly 500 therein to move along the first direction by arranging the first actuating assembly 400, and drives the lens assembly 500 to move along the second direction by arranging the second actuating assembly 600, so as to control the lens assembly 500 to move in the first direction and the second direction, compensate the displacement, eliminate the influence of shake on imaging, and thus realize optical anti-shake. The first actuating assembly 400 is driven by electrostriction of the first piezoelectric actuator 410, and the second actuating assembly 600 is driven by electrostriction of the second piezoelectric actuator 610, so that the stability of the optical anti-shake performance of the lens module 100 is improved due to the stability of the electrostriction performance of the piezoelectric actuators, and the reliability of the shooting function of the electronic device is further improved. In addition, the displacements of the lens assembly 500 in the first direction and the second direction are independently controlled by the first actuating assembly 400 and the second actuating assembly 600, i.e. only the displacement required to be compensated in the first direction and the displacement required to be compensated in the second direction need to be calculated, and then the first actuating assembly 400 and the second actuating assembly 600 are respectively controlled to compensate the displacements, so that optical anti-shake can be realized, which is beneficial to simplifying the algorithm.

In the present embodiment, the first direction is the X-axis direction shown in fig. 3, the second direction is the Y-axis direction shown in fig. 3, and the optical axis direction is the Z-axis direction shown in fig. 3. It should be noted that, in other embodiments, the first direction may be the Y-axis direction shown in fig. 3, and the second direction may be the X-axis direction shown in fig. 3

The outer frame 210 has a first guide portion 212, the inner frame 300 has a second guide portion 302, and the second guide portion 302 is connected to the first guide portion 212 in a guiding manner and is movable in a first direction. Under the guiding action of the first guiding portion 212, the second guiding portion 302 moves along the first direction, that is, the inner frame 300 moves along the first direction in the outer frame 210, which is beneficial to accurately controlling the displacement of the inner frame 300 and the lens assembly 500 therein, and improving the optical anti-shake performance.

The outer frame 210 includes two opposing outer edges 214 and two opposing connecting strips 216, each connecting strip 216 being connected between the two outer edges 214. The inner frame 300 includes two opposing inner edge portions 304 and two opposing connecting edge portions 306, each connecting edge portion 306 being connected between two inner edge portions 304.

Further, the first guide portion 212 is disposed on one outer edge portion 214, and the first actuating assembly 400 is connected to an inner side of the other outer edge portion 214. The second guide portion 302 is disposed on one inner side portion 304, and the first actuating assembly 400 is connected to the outside of the other inner side portion 304. The first actuating assembly 400 can be fixedly connected to the outer edge portion 214 and the inner edge portion 304 by laser welding, bonding, or other connecting methods.

In this embodiment, the first guiding portion 212 is a guiding shaft, and the number of the guiding shafts may be, but is not limited to, two; the second guide portion 302 is a guide hole, and the number of the guide holes may be, but is not limited to, two. It is understood that in other embodiments, the first guide portion 21 is a guide hole and the second guide portion 302 is a corresponding guide shaft; alternatively, the first guide portion 212 is a guide rail provided on the inner side of the connecting frame strip 216, and the second guide portion 302 is a guide groove provided on the outer side of the connecting side portion 306; alternatively, the first guide portion 212 is a guide groove provided on the inner side of the connecting frame strip 216, and the second guide portion 302 is a guide rail provided on the outer side of the connecting side portion 306.

The inner frame 300 is provided with a third guiding portion 308, the lens assembly 500 is provided with a fourth guiding portion 502, and the fourth guiding portion 502 is connected with the third guiding portion 308 in a guiding manner and can move along the second direction in a guiding manner. Under the guiding action of the third guiding portion 308, the fourth guiding portion 502 is guided to move along the second direction, that is, the lens assembly 500 is guided to move along the second direction in the inner frame 300, which is beneficial to accurately controlling the displacement of the lens assembly 500 and improving the optical anti-shake performance.

Further, a third guiding portion 308 is disposed on one connecting edge 306, and the second actuating assembly 600 is connected to the inner side of the other connecting edge 306. Lens assembly 500 has two opposing connecting surfaces 504, fourth guide 502 is disposed on one connecting surface 504, and second actuation assembly 600 is coupled to the other connecting surface 504. Wherein, the second actuating assembly 600 can be fixedly connected with the connecting edge portion 306 and the connecting surface 504 by laser welding, bonding or other connecting methods.

In this embodiment, the third guiding portion 308 is a guiding shaft, and the number of the guiding shafts may be, but is not limited to, two; the fourth guide portion 502 is a guide hole, and the number of the guide holes may be, but is not limited to, two. It is understood that in other embodiments, the third guide portion 308 is a guide hole and the fourth guide portion 502 is a corresponding guide shaft; alternatively, the third guide portion 308 is a guide rail disposed inside the inner side portion 304, and the fourth guide portion 502 is a guide groove disposed on a side surface of the lens assembly 500; alternatively, the third guide portion 308 is a guide groove provided inside the inner side portion 304, and the fourth guide portion 502 is a guide rail provided on a side surface of the lens assembly 500.

In this embodiment, the first actuating assembly 400 includes two first piezoelectric actuators 410 arranged in series, so that the expansion displacement of the first actuating assembly 400 is increased, that is, the displacement of the inner frame 300 and the lens assembly 500 therein in the first direction is increased, the displacement can be compensated in a wider range, and the optical anti-shake performance is improved. The second actuating assembly 600 includes two second piezoelectric actuators 610 arranged in series, so that the amount of telescopic displacement of the second actuating assembly 600 is increased, that is, the displacement of the lens assembly 500 in the second direction is increased, the amount of displacement can be compensated in a wider range, and the optical anti-shake performance is improved. It should be noted that the number of the first piezoelectric actuators 410 of the first actuating assembly 400 is not limited to two, and the specific number thereof may be set according to actual requirements; the number of the second piezoelectric actuators 610 of the second actuation assembly 600 is not limited to two, and the specific number can be set according to actual requirements.

With reference to fig. 4 and 5, fig. 4 shows a schematic structural diagram of a piezoelectric actuator of a lens module in this embodiment, fig. 5 shows an operational schematic diagram of the piezoelectric actuator in fig. 4, the first piezoelectric actuator 410 and the second piezoelectric actuator 610 have the same operational principle and the same structural components, but the specification and the amount of expansion and contraction displacement can be set to be the same or different according to actual requirements. Therefore, each of the first piezoelectric actuator 410 and the second piezoelectric actuator 610 includes a piezoelectric deformation piece 412 and two elastic clamping pieces 414, the piezoelectric deformation piece 412 is located between the two elastic clamping pieces 414, two ends of each elastic clamping piece 414 are connected to two ends of the piezoelectric deformation piece 412 in a one-to-one correspondence, and each elastic clamping piece 414 is arched from two ends to the middle. Wherein the outer side of the resilient clip 414 is used to connect different structures. The outer side surfaces of the two adjacent piezoelectric actuators are fixedly connected in series, and the outer side surfaces of the two piezoelectric actuators which are arranged in parallel are fixedly connected through a connecting structure.

Further, notches 416 are formed at both ends of each elastic clip 414, and a portion of the piezoelectric deformation sheet 412 is exposed as a driving electrode 418. The electrostriction of the piezoelectric actuator utilizes the inverse piezoelectric effect of the piezoelectric deformation piece 412, and a driving voltage is applied to a driving electrode 418 of the piezoelectric deformation piece 412 to deform the piezoelectric deformation piece 412, so that the deformation generated by the piezoelectric deformation piece 412 can be amplified and utilized according to design requirements by selecting the appropriate thickness and inclination angle of the elastic clamping piece 414 in combination with the triangular orthogonal displacement amplification principle.

The specific working principle of the piezoelectric actuator of the embodiment is as follows:

when a reverse (negative) voltage is applied to the piezoelectric deformation piece 412 through the driving electrode 418, in an unconstrained state, the piezoelectric deformation piece 412 is shortened in the Y-axis direction, assuming that the total deformation of the piezoelectric deformation piece 412 shortened in the Y-axis direction is Δ Y, while the two ends of the piezoelectric deformation piece 412 are respectively shortened by Δ Y/2, and the two ends of the two elastic clamping pieces 414 are respectively shortened by Δ Y/2, at this time, the total deformation of the two elastic clamping pieces 414 in the X-axis direction is Δ X, and each elastic clamping piece 414 is extended by Δ X/2 in the X-axis direction, obviously, in a constrained state, the elastic clamping piece 414 on the unconstrained side is extended by Δ X in the X-axis direction;

when a forward (positive) voltage is applied to the piezoelectric deformation piece 412 through the driving electrode 418, the piezoelectric deformation piece 412 is extended in the Y-axis direction in the unconstrained state, and both ends of the two elastic clamping pieces 414 are extended in the Y-axis direction, respectively, and at this time, the two elastic clamping pieces 414 are shortened in the X-axis direction, respectively, and obviously, the elastic clamping piece 414 on the unconstrained side is shortened in the X-axis direction in the constrained state.

Referring to fig. 6 to 8, fig. 6 is a schematic structural diagram illustrating a view angle of a lens assembly of a lens module in the present embodiment, fig. 7 is a schematic structural diagram illustrating another view angle of the lens assembly of the lens module in the present embodiment, and fig. 8 is an exploded view illustrating the lens assembly of fig. 6, wherein the lens assembly 500 includes a displacement magnification mechanism 510, a third piezoelectric actuator 520, and a lens module 530. The displacement amplification mechanism 510 includes two opposite connection members 511 and two opposite displacement amplification members 512, each displacement amplification member 512 is connected between the two connection members 511, and a through hole 513 is formed on the displacement amplification member 512. A third piezoelectric actuator 520 is connected to the inner side of one of the connectors 511, and another third piezoelectric actuator 520 is connected to the inner side of the other connector 511. The lens module 530 is connected between the two third piezoelectric actuators 520, the lens module 530 includes a lens holder 540 movable along the optical axis, and the lens holder 540 is connected to a displacement amplifier 512 and extends through the through hole 513. All the third piezoelectric actuators 520 between the lens module 530 and the two connecting members 511 can drive the two connecting members 511 to move toward or away from each other along the first direction, so as to link the displacement amplifying members 512 to move in an extending and contracting manner, thereby driving the lens holder 540 to move along the optical axis direction.

When a reverse (negative) voltage is applied to the third piezoelectric actuator 520 through the driving electrode 418, the third piezoelectric actuator 520 expands to push the two connecting members 511 to move back and forth, the displacement amplifying member 512 contracts inward to drive the lens base 540 to contract inward along the optical axis direction, and at this time, the position of the lens base 540 is close to the image sensor; when a forward (positive) voltage is applied to the third piezoelectric actuator 520 through the driving electrode 418, the third piezoelectric actuator 520 contracts and drives the two connecting members 511 to move toward each other, the displacement amplifying member 512 protrudes outward and drives the lens holder 540 to extend outward along the optical axis, and the position of the lens holder 540 is away from the image sensor, thereby achieving the auto-focusing function of the lens module 100. Therefore, compared with the auto-focus using the Voice Coil Motor (VCM), the lens module 100 increases the movement displacement of the lens holder 540, thereby increasing the focusing range, and has the outstanding advantages of fast response speed (microsecond), low energy consumption (microwatt), large driving force (gram), no electromagnetic interference, and the like. It should be noted that in other embodiments, the number of the third piezoelectric actuators 520 between the lens module 530 and each of the connection pieces 511 is not limited to one, and two third piezoelectric actuators 520 connected in series may be disposed according to actual requirements, for example, between the side of the lens module 530 and the inner side of one of the connection pieces 511.

The displacement amplification member 512 is arched from two sides, which are two sides connected to the connection member 511, toward the middle and from the inside to the outside. The displacement amplification member 512 performs a telescopic motion by using a vaulted (convex) design, and when the distance between the two connection members 511 increases, the displacement amplification member 512 is elongated, resulting in a reduced degree of vaulting and inward contraction; when the distance between the two connection pieces 511 is reduced, the displacement amplification piece 512 is shortened, resulting in a greater degree of arching to protrude outward.

In particular, the displacement amplification element 512 comprises a middle portion 514 between the two sides, the middle portion 514 being provided with a connection portion 515, the connection portion 515 being connected to the mirror base 540. Since the range of telescopic movement of the intermediate part 514 is greater relative to the other parts, the provision of the connecting part 515 in the intermediate part 514 facilitates improved displacement of the mirror base 540 to which it is connected. The displacement amplification member 512 further comprises two side portions 516, each side portion 516 is connected between the middle portion 514 and a connecting member 511, and the size of the inclination angle and the length of the side portion 516 can affect the telescopic displacement of the displacement amplification member 512, so that the telescopic displacement of the displacement amplification member 512 can be adjusted by setting the inclination angle and the length of the side portion 516, thereby meeting the requirement for different displacement amplification.

In this embodiment, the displacement amplification element 512 is generally in the shape of an isosceles trapezoid, i.e., the middle portion 514 corresponds to the top side of the isosceles trapezoid, and the two side portions 516 correspond to the two isosceles sides of the isosceles trapezoid. It will be appreciated that in other embodiments, each side portion 516 of the displacement amplifying member 512 may include two portions that are bent, or the displacement amplifying member 512 may not be provided with the middle portion 514.

In this embodiment, the connecting portion 515 is a connecting hole, and the matching portion of the lens holder 540 can be inserted into the connecting hole and fixedly connected to the displacement amplifier 512 by laser welding, bonding or other connecting methods. The number of the connection portions 515 may be set according to actual requirements. It is understood that in other embodiments, a screw hole may be formed in the lens holder 540, and the lens holder 540 is fixedly connected to the displacement amplifier 512 by connecting the screw hole to the connection portion 515 via a screw. The connecting portion 515 may also be a connecting surface or a connecting protrusion, and the connecting surface or the connecting protrusion is fixedly connected with the matching portion of the lens holder 540 by laser welding, bonding, integral forming connection or other connection methods.

In this embodiment, the displacement amplifying element 512 is disposed in a sheet shape and has elasticity, and the material thereof may be, but not limited to, metal, and has elastic and telescopic properties. The thickness and the inclination angle of the displacement-amplifying element 512 can be set according to actual requirements, and can be determined according to the required amount of telescopic displacement and the driven object.

In this embodiment, the connecting member 511 is a long strip or a plate, and the thickness thereof can be set according to actual requirements on the premise of satisfying the connection strength, and the material thereof can be, but is not limited to, plastic. An avoiding through hole 517 is formed in one of the connecting pieces 511, and the avoiding through hole 517 is arranged corresponding to the first guide portion 212 and the second guide portion 302 to provide a moving space for the first guide portion 212. Meanwhile, in order to prevent the first guide portion 212 from interfering with the movement of the lens assembly 500 in the second direction (Y-axis direction), the aperture of the escape through hole 517 is large or the escape through hole 517 is long, so that the space in the second direction is larger than the stroke of the lens assembly 500 in the second direction. The connection piece 511 and the displacement amplification piece 512 may be laser welded, bonded, integrally formed, or otherwise connected to form the displacement amplification mechanism 510.

In the present embodiment, the third piezoelectric actuator 520 has the same operation principle and the same structural components as the first piezoelectric actuator 410 and the second piezoelectric actuator 610, but has a different specification and a different amount of expansion and contraction displacement from the first piezoelectric actuator 410 and the second piezoelectric actuator 610.

Referring to fig. 9, fig. 9 is a schematic diagram illustrating an operation principle of the displacement magnifying mechanism of the lens module in this embodiment, and the specific operation principle of the displacement magnifying member 512 in this embodiment is as follows:

when a reverse (negative) voltage is applied to the piezoelectric deformation piece 412 of the third piezoelectric actuator 520 through the driving electrode 418, in the constrained state, assuming that the elastic clamping piece 414 on the unconstrained side extends by Δ X in the X-axis direction, and drives each connecting piece 511 to move back by Δ X in the X-axis direction, the total displacement of the two connecting pieces 511 in the X-axis direction is 2 Δ X, and the two displacement amplification pieces 512 respectively shorten by Δ X on both sides in the X-axis direction, at this time, the two displacement amplification pieces 512 shorten in the Z-axis direction and contract inward toward each other;

when a positive (positive) voltage is applied to the piezoelectric deformation piece 412 of the third piezoelectric actuator 520 through the driving electrode 418, in the constrained state, the elastic clamping piece 414 on the unconstrained side is shortened in the X-axis direction, and each connecting piece 511 is driven to move relatively in the X-axis direction, assuming that the total displacement of the connecting piece 511 in the X-axis direction is 2 Δ X, and the two connecting pieces 511 move relatively in the X-axis direction Δ X, and the two displacement amplification pieces 512 are also shortened by Δ X on both sides in the X-axis direction, at this time, the total deformation of the two displacement amplification pieces 512 in the Z-axis direction is Δ Z, and each displacement amplification piece 512 is extended by Δ Z/2 in the Z-axis direction.

Therefore, the expansion and contraction movement of the third piezoelectric actuator 520 can realize the amplification of the movement displacement, and the movement displacement of the third piezoelectric actuator 520 is further amplified by the displacement amplification mechanism 510, so that the two-stage amplification of the movement displacement is realized, and the output of the movement displacement is increased.

Referring to fig. 8, the lens module 530 further includes a guide ring 550. The guide ring 550 has two opposite sides 552, the two sides 552 of the guide ring 550 are connected between the two third piezoelectric actuators 520, and one end of the lens holder 540 is connected with the guide ring 550 and can move along the guide ring 550 in a guiding way. Two side portions 552 of the guide ring 550 are fixedly connected to a third piezoelectric actuator 520, respectively, and the guide ring 550 can move along the optical axis toward the lens holder 540, and the two side portions 552 of the guide ring 550 can be moved in the direction by the displacement amplification mechanism 510 and converted into the axial movement of the guide ring 550. Therefore, the guide ring 550 not only serves to guide the movement of the lens holder 540, but also serves to fix the connection. Wherein, the two side portions 552 of the guide ring 550 may be provided as sides, but not limited thereto. The side portion 552 of the guide ring 550 may be fixedly coupled to the outer side surface of the third piezoelectric actuator 520 by laser welding, adhesive bonding, integral molding, or other coupling methods.

The mirror base 540 includes a bracket 542 and a lens 544, the lens 544 being mounted in the bracket 542. One end of the bracket 542 is guided in the guide ring 550, and the other end is connected to the displacement amplifier 512. Specifically, the outer circumferential surface of one end of the bracket 542 is fitted to the inner circumferential surface of the guide ring 550, thereby achieving a guiding connection.

The bracket 542 includes a sleeve 546 and a retaining collar 548. One end of the sleeve 546 is sleeved with the lens 544, and the other end is guided and arranged in the guide ring 550. A stop collar 548 is provided at an end of the sleeve 546 remote from the guide ring 550, the stop collar 548 being connected to the displacement amplifier 512 and being stopped by an end of the guide ring 550. The guiding stroke of the sleeve 546 in the guide ring 550 is greater than the amount of telescopic displacement of the displacement amplification member 512, preventing the sleeve 546 from separating from the guide ring 550.

Further, the sleeve 546 is provided with internal threads, the lens 544 is provided with external threads, and the lens 544 is installed in the sleeve 546 through threaded connection, so that the lens 544 is convenient to detach and install, and replacement of different types of lenses 544 is facilitated. The limit protrusion ring 548 is provided with a first protrusion 549, and the first protrusion 549 is inserted into the connection portion 515 of the displacement amplification member 512 and fixedly connected thereto by laser welding, bonding, or other connection means.

The lens module 530 further includes a fixing ring 560, one end of the fixing ring 560 is connected to the guide ring 550 and can move along the guide ring 550 in a guiding manner, and the other end of the fixing ring 560 is connected to the other displacement amplification member 512. Since the fixing ring 560 is guide-coupled to the guide ring 550, it can move in the optical axis direction in accordance with the expansion and contraction motion of the displacement amplification member 512.

One end of the fixing ring 560 is provided with a sliding groove 562, and the sliding groove 562 is sleeved with one end of the guide ring 550 and is provided with two side portions 552 of the clearance guide ring 550. Due to the clearance treatment of the part of the sliding groove 562 corresponding to the side portion 552 of the guide ring 550, the sliding groove 562 is prevented from interfering with the fixed connection between the guide ring 550 and the third piezoelectric actuator 520, and the requirement of the guide connection between the fixed ring 560 and the guide ring 550 is met. The other end of the fixing ring 560 is provided with a second projection 564, and the second projection 564 is inserted into the connecting portion 515 of the displacement amplifier 512 and fixedly connected thereto by laser welding, bonding, or other connection means. Wherein the opposing connection surfaces 504 of the lens assembly 500 are disposed on the retaining ring 560.

Referring to fig. 3, the assembly process of the lens module 100 of the present embodiment is as follows:

first, a connecting surface 504 of lens assembly 500 is fixedly connected to second actuation assembly 600, which may be, but is not limited to, laser welding or adhesive bonding;

secondly, guiding and connecting the fourth guiding portion 502 on the other connecting surface 504 of the lens assembly 500 with the third guiding portion 308 on one connecting side 306 of the inner frame 300, and fixedly connecting the second actuating assembly 600 with the other connecting side 306 of the inner frame 300, wherein the fixed connection mode can be, but is not limited to, laser welding or bonding;

then, an inner edge 304 of the inner frame 300 is fixedly connected to the first actuating assembly 400, which may be, but not limited to, laser welding or adhesive bonding;

finally, the second guiding portion 302 of the other inner side 304 of the inner frame 300 is guided and connected to the first guiding portion 212 of the one outer side 214 of the outer frame 210, and the first actuating assembly 400 is fixedly connected to the other outer side 214 of the outer frame 210 by, but not limited to, laser welding or bonding.

The outer shell 200 further includes a connecting wall 220, the connecting wall 220 is connected to one end of the outer frame 210 to form a receiving space, and the receiving space receives the inner frame 300. The connecting wall 220 is provided with an avoiding hole 222 for avoiding the movement of the mirror seat 540. The connecting wall 220 is spaced apart from the displacement amplifying member 512 to prevent interference with the expansion movement of the displacement amplifying member 512.

Referring to fig. 8, the lens assembly 500 of the present embodiment is assembled through the following steps, but the assembling manner is not limited thereto:

firstly, the fixing ring 560, the guide ring 550 and the bracket 542 are sequentially nested and connected;

then, the outer side surface of an elastic clip 414 of a third piezoelectric actuator 520 is fixedly connected with one side portion 552 of the guide ring 550, and the outer side surface of an elastic clip 414 of another third piezoelectric actuator 520 is fixedly connected with the other side portion 552 of the guide ring 550, wherein the fixing connection mode can be, but is not limited to, laser welding or bonding connection;

secondly, fixedly connecting a connecting piece 511 with the outer side surface of another elastic clamping piece 414 of a third piezoelectric actuator 520, fixedly connecting another connecting piece 511 with the outer side surface of another elastic clamping piece 414 of another third piezoelectric actuator 520, and correspondingly and fixedly connecting two displacement amplification pieces 512 with two connecting pieces 511, wherein the fixed connection mode can be, but is not limited to, laser welding or bonding connection;

finally, the lens 544 is mounted in the bracket 542, and the assembly of the lens assembly 500 is completed.

Referring to fig. 10, fig. 10 is a schematic diagram of a camera module according to an embodiment of the present invention, and the camera module 700 according to an embodiment of the present invention includes a base 710 and a lens module 100, where the base 710 includes an image sensor 712. The specific structure of the lens module 100 refers to the above embodiments, and since the camera module 700 of this embodiment adopts all the technical solutions of all the embodiments, all the beneficial effects brought by the technical solutions of the embodiments are also achieved, and are not described in detail herein. The lens 544 of the lens module 100 is disposed corresponding to the image sensor 712, and the distance between the image sensors 712 is adjusted by controlling different positions of the lens 544, so as to achieve auto-focusing. The image sensor 712, which may also be referred to as a light-sensing chip or light-sensing element, may convert received optical signals into electrical signals. The present application is not limited to a specific type of the image sensor 712, and thus any type of photoelectric conversion device that can capture an optical signal and generate an electrical signal may be applied to the present application. By way of example, the Image Sensor 712 may include, but is not limited to, a CCD (Charged Coupled Device), a CMOS (Complementary Metal-Oxide Semiconductor), a CIS (Contact Image Sensor) Device.

In this embodiment, the base 710 further includes a base plate 714, a mounting groove 716 is formed on the base plate 714, and the image sensor 712 is mounted in the mounting groove 716. The housing 200 of the lens module 100 is mounted on the substrate 714.

When the camera module 700 of this embodiment is applied to a mobile phone, the actual working process of the automatic focusing is as follows:

when it is detected that the user turns on the camera function, a reverse (negative) voltage is applied to the third piezoelectric actuator 520 to drive the third piezoelectric actuator to a predetermined position, at this time, the elastic clip 414 of the third piezoelectric actuator 520 expands outward, and the displacement magnifying element 512 of the displacement magnifying mechanism 510 contracts inward, that is, the lens 544 moves to a position relatively close to the image sensor 712, that is, a so-called far focus position, and in general, the camera module 700 of the mobile phone uses the far focus position as the starting point of auto-focusing; then, the magnitude of the driving voltage of the third piezoelectric actuator 520 is adjusted according to the actual requirement of the user to obtain the required position of the lens 544, so that the imaging of the photographic subject on the image sensor 712 required by the user is clearest. The maximum stroke of the lens 544 of the camera module 700 is from the position of the lens 544 at which the third piezoelectric actuator 520 is applied with the maximum forward voltage to the position of the lens 544 at which the third piezoelectric actuator 520 is applied with the maximum reverse voltage.

Referring to fig. 11, fig. 11 is a block diagram of an electronic device according to an embodiment of the present invention, in which the electronic device 800 includes a power supply module 810 and a camera module 700, and the power supply module 810 is electrically connected to the camera module 700. The specific structure of the camera module 700 refers to the above embodiments, and since the electronic device 800 of this embodiment adopts all the technical solutions of all the embodiments, all the beneficial effects brought by the technical solutions of the embodiments are also achieved, and are not described in detail herein. The power supply module 810 is electrically connected to the piezoelectric actuator of the camera module 700 to supply power to the piezoelectric actuator. The piezoelectric actuators include, but are not limited to, the first piezoelectric actuator 410, the second piezoelectric actuator 610, and the third piezoelectric actuator 520.

This electronic device 800 includes and is not limited to smart phones, tablet computers, notebook computers, pan-tilt shooting devices, surveillance cameras, and other imaging devices.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A lens module, comprising:

a housing comprising an outer frame;

the lens component is movably arranged in the inner frame and moves along a second direction; and

2. The lens module as claimed in claim 1, wherein the outer frame has a first guide portion, and the inner frame has a second guide portion, the second guide portion being connected to the first guide portion and movable along the first direction.

3. The lens module as recited in claim 2,

the outer frame comprises two opposite outer edge parts, the first guide part is arranged on one outer edge part, and the first actuating assembly is connected with the inner side of the other outer edge part;

the inner frame comprises two opposite inner edge parts, the second guide part is arranged on one inner edge part, and the first actuating assembly is connected with the outer side of the other inner edge part.

4. The lens module as claimed in claim 3, wherein the inner frame has a third guiding portion, and the lens assembly has a fourth guiding portion, the fourth guiding portion being connected to the third guiding portion and being guided to move along the second direction.

5. The lens module as recited in claim 4,

the inner frame further comprises two opposite connecting edge parts, each connecting edge part is connected between the two inner edge parts, the third guide part is arranged on one connecting edge part, and the second actuating combination is connected with the inner side of the other connecting edge part;

the lens assembly is provided with two opposite connecting surfaces, the fourth guide part is arranged on one connecting surface, and the second actuating assembly is connected with the other connecting surface.

6. The lens module as recited in claim 1, wherein the first actuation assembly comprises two of the first piezoelectric actuators arranged in series, and the second actuation assembly comprises two of the second piezoelectric actuators arranged in series.

7. The lens module according to any one of claims 1 to 6, wherein the lens assembly comprises:

8. The lens module as claimed in claim 7, wherein the first piezoelectric actuator, the second piezoelectric actuator and the third piezoelectric actuator each comprise a piezoelectric deformation piece and two elastic clamping pieces, the piezoelectric deformation piece is located between the two elastic clamping pieces, two ends of each elastic clamping piece are connected with two ends of the piezoelectric deformation piece in a one-to-one correspondence, and each elastic clamping piece is arched from two ends to the middle; wherein, the lateral surface of elasticity clamping piece is used for connecting.

9. The lens module as recited in claim 7,

the displacement amplification piece is arranged from two sides to the middle in an arched manner from inside to outside, and the two sides are connected with the connecting piece;

the displacement amplification piece comprises a middle part positioned between the two sides, and the middle part is provided with a connecting part which is connected with the lens base.

10. The lens module as claimed in claim 7, wherein the lens module further comprises:

11. The lens module as claimed in claim 10, wherein the lens module further comprises:

12. The lens module as claimed in claim 11, wherein a sliding groove is formed at one end of the fixing ring, and the sliding groove is sleeved on one end of the guide ring and spaced from two sides of the guide ring.

13. A camera module, comprising a base including an image sensor, characterized in that the camera module further comprises the lens module of any one of claims 1 to 12, the lens module being disposed corresponding to the image sensor of the base.

14. An electronic device, comprising:

a camera module; and

the power supply module is electrically connected with the camera module;

the camera module of claim 13, wherein the power supply module is electrically connected to the piezoelectric actuator of the camera module to supply power to the piezoelectric actuator.