Lens assembly and camera module

Abstract

A lens assembly and an imaging module are disclosed. The lens assembly includes at least two coaxially arranged lens portions, and in a working state, a relative position relationship between the at least two lens portions is adjusted by a driver so that an effective focal length of an optical system formed by the at least two lens portions is within a preset range. In this way, the imaging module has a relatively small height dimension in a non-working state, and the imaging module has a relatively large effective focal length in a working state, thus solving the technical contradiction between the overall height dimension and the relatively large effective focal length of a conventional upright imaging module.

Description

Technical Field

[0001] This application relates to the field of camera modules, and particularly to lens assemblies and camera modules. Background Art

[0002] With the popularization of mobile electronic devices, the related technologies of camera modules used in mobile electronic devices to help users obtain images (such as videos or pictures) have developed rapidly. Currently in the market, camera modules configured in mobile electronic devices (such as smart phones) need to implement multi - zoom shooting functions.

[0003] To meet the technical requirements of multi - zoom shooting or long - focal - length shooting, at least one long - focal - length camera module needs to be configured. Here, a long - focal - length camera module refers to a camera module with a relatively large effective focal length. As the zoom multiple increases, the total effective focal length of the long - focal - length camera module increases, resulting in a continuous increase in the overall height dimension of the camera module, which is obviously difficult to adapt to the development trend of the thin and light of electronic devices.

[0004] To solve the technical contradiction between the height dimension and the relatively large effective focal length of traditional upright camera modules, most manufacturers use periscope camera modules to replace traditional upright camera modules. Compared with traditional upright camera modules, periscope camera modules change their imaging optical path through optical turning elements (such as prisms, mirrors, etc.), so as to reduce the overall height dimension of the camera module while meeting the optical design requirements of having a relatively large effective focal length.

[0005] However, periscope camera modules have a relatively more complex structure, which on the one hand leads to an increase in their cost, and on the other hand, directly increases their processing difficulty. In addition, periscope camera modules sacrifice the dimensions in the length and width directions to obtain a reduction in their height direction, and periscope camera modules with relatively large length and width dimensions are not aesthetically pleasing on terminal devices, affecting the user experience.

[0006] Moreover, in terms of optical performance, although periscope camera modules have a relatively large effective focal length, their effective focal length is a fixed value, that is, the optical performance of periscope camera modules has relatively poor adjustability. To meet the diverse needs of consumers for camera modules, multiple camera modules usually need to be configured for electronic devices, that is, multi - camera modules are configured for electronic devices, which not only brings a sharp increase in cost, but also further exacerbates the processing difficulty.

[0007] Therefore, an optimized camera module solution is needed to solve the technical contradiction between the height dimension and the relatively large effective focal length of the camera module. Summary of the Invention

[0008] One advantage of the present application is to provide a lens assembly and a camera module, wherein the camera module staggers the contradiction between the overall height dimension and the larger effective focal length of the upright camera module in time distribution. Specifically, the camera module has a relatively small height dimension when not in operation, and has a relatively large effective focal length when in operation, so as to meet the terminal device's requirements for the overall height dimension of the camera module when not in operation, and meet the requirements for the larger effective focal length of the camera module when in operation.

[0009] Another advantage of the present application is to provide a lens assembly and a camera module, wherein the camera module uses a split lens including at least two lens parts as its imaging lens, and in a working state, a driver is used to adjust the relative position relationship between the at least two lens parts so that the effective focal length of the optical system formed by the at least two lens parts is within a preset range. In this way, the camera module has a relatively small height dimension in a non-working state, and has a relatively large effective focal length in a working state. In this way, the technical contradiction between the overall height dimension and the larger effective focal length of the traditional upright camera module is solved.

[0010] Another advantage of the present application is to provide a lens assembly and a camera module, wherein, through the driver and the split lens, the camera module can adjust optical performance such as optical zoom and / or optical focus. That is, the camera module according to the embodiment of the present application has a relatively strong optical performance adjustment capability.

[0011] Other advantages and features of the present application will become apparent from the following description, and may be achieved by the means and combinations particularly pointed out in the claims.

[0012] To achieve at least one of the above advantages, the present application provides a lens assembly, comprising:

[0013] An optical lens having an optical axis, comprising a first lens portion and a second lens portion arranged along the optical axis, wherein the first lens portion comprises at least one optical lens, and the second lens portion comprises at least one optical lens, wherein a gap is provided between the first lens portion and the second lens portion; and

[0014] A driving assembly includes a first driving element, wherein the first driving element is configured to drive the first lens portion to move along a direction set by the optical axis to adjust the first lens portion and the second lens portion to a predetermined position, wherein, at the predetermined position, an effective focal length of an optical system formed by the first lens portion and the second lens portion is within a preset range.

[0015] In the lens assembly according to the present application, the driving assembly further includes a second driving element, which is configured to drive the second lens portion to move along the direction set by the optical axis for optical focusing after the first driving element adjusts the first lens portion and the second lens portion to the predetermined position; wherein, during the process of driving the second lens portion to move by the second driving element, the effective focal length of the optical system formed by the first lens portion and the second lens portion remains within the preset range.

[0016] In the lens assembly according to the present application, the driving assembly further includes a second driving element, which is configured to drive the second lens portion to move along the direction set by the optical axis for optical zooming after the first driving element adjusts the first lens portion and the second lens portion to the predetermined position.

[0017] In the optical system formed by the first lens portion and the second lens portion in the lens assembly according to the present application, the distance between the lowermost optical lens in the first lens portion and the uppermost optical lens in the second lens portion is the largest.

[0018] In the lens assembly according to the present application, the lens assembly further includes a base and a housing supported on the base. The housing has a receiving cavity and a first opening communicating with the receiving cavity. Among them, the optical lens is received in the receiving cavity of the housing. The first lens portion of the optical lens corresponds to the first opening, and the aperture of the first opening is larger than the outer diameter of the first lens portion to allow the first lens portion to extend out of or retract into the receiving cavity through the first opening under the drive of the first driving element.

[0019] In the lens assembly according to the present application, the lens assembly further includes a lens bracket. The lens bracket has a mounting cavity and a second opening formed at the upper end of the lens bracket and communicating with the mounting cavity. Among them, the first lens portion is mounted in the mounting cavity of the lens bracket, and the first driving element is configured to drive the lens bracket to move along the direction set by the optical axis to drive the first lens portion to move along the direction set by the optical axis.

[0020] In the lens assembly according to the present application, the first driving element is implemented as a piezoelectric actuator.

[0021] In the lens assembly according to the present application, the driving assembly further includes a guiding mechanism for guiding the lens bracket to move along the direction set by the optical axis.

[0022] In the lens assembly according to the present application, the first driving element and the guiding mechanism are located on the opposite first side and second side of the lens bracket.

[0023] In the lens assembly according to the present application, the outer diameter of the upper end portion of the lens bracket is equal to the inner diameter of the first opening, so that the lens bracket is clamped within the first opening.

[0024] In the lens assembly according to the present application, the lens assembly further includes a light-transmissive cover plate for sealing the second opening.

[0025] In the lens assembly according to the present application, the lens bracket includes a cylindrical bracket body and support legs extending outward and downward from the cylindrical bracket body, wherein the inner cavity of the cylindrical bracket body forms the installation cavity.

[0026] In the lens assembly according to the present application, the second driving element is implemented as an electromagnetic motor, and the second lens portion is mounted on the electromagnetic motor.

[0027] In the lens assembly according to the present application, the second driving element is located inside the first driving element.

[0028] In the lens assembly according to the present application, the second driving element is implemented as an electromagnetic motor, wherein the second driving element is located inside the first driving element.

[0029] In the lens assembly according to the present application, the second driving element is disposed within the space formed by the support legs of the lens bracket, such that the second driving element is located inside the first driving element.

[0030] In the lens assembly according to the present application, the lens assembly further includes a limiting element disposed above the second lens portion for limiting the maximum height of upward movement of the second lens portion.

[0031] In the lens assembly according to the present application, the lens assembly further includes an isolation element disposed around the second lens portion, the isolation element forms an isolation cavity, and the second lens portion is located within the isolation cavity.

[0032] According to another aspect of the present application, there is also provided an imaging module, which includes:

[0033] A photosensitive component, including a circuit board and a photosensitive chip electrically connected to the circuit board; and

[0034] The lens assembly as described above, wherein the lens assembly is held on the light-sensitive path of the photosensitive component.

[0035] In the camera module according to the present application, the driving assembly further includes a third driving element, and the third driving element is configured to drive the photosensitive assembly to move in a plane perpendicular to the optical axis for optical image stabilization.

[0036] In the camera module according to the present application, the third driving element is configured to drive the photosensitive chip of the photosensitive assembly to move in a plane perpendicular to the optical axis for optical image stabilization.

[0037] In the camera module according to the present application, the third driving element is implemented as a shape memory alloy actuator.

[0038] In the camera module according to the present application, the lens assembly is mounted on the substrate in such a way that the lens assembly is held on the light sensing path of the photosensitive assembly.

[0039] Through the understanding of the subsequent description and the drawings, the further objects and advantages of the present application will be fully realized.

[0040] These and other objects, features, and advantages of the present application will be fully realized through the following detailed description, drawings, and claims. Description of the Drawings

[0041] By describing the embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application, and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0042] Illustrated is a three-dimensional schematic diagram of the camera module according to the embodiment of the present application in a non-working state.

[0043] Illustrated is a three-dimensional exploded view of the camera module according to the embodiment of the present application.

[0044] Illustrated is a cross-sectional schematic diagram of the camera module according to the embodiment of the present application.

[0045] Illustrated is a three-dimensional schematic diagram of the camera module according to the embodiment of the present application switching from a non-working state to a working state.

[0046] Illustrated is one of the schematic diagrams of the camera module according to the embodiment of the present application in a working state.

[0047] Illustrates the second schematic diagram of the imaging module according to an embodiment of the present application in the working state.

[0048] and Illustrates the schematic diagram of the first driving element according to an embodiment of the present application.

[0049] and Illustrates the schematic diagram of a modified implementation of the first driving element according to an embodiment of the present application.

[0050] Illustrates the first schematic diagram of the electronic device according to an embodiment of the present application.

[0051] Illustrates the second schematic diagram of the electronic device according to an embodiment of the present application. Detailed implementation

[0052] Next, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein.

[0053] Exemplary imaging module

[0054] As shown, the imaging module according to an embodiment of the present application is illustrated. Among them, the imaging module 300 includes a photosensitive component 10, a substrate 21 mounted on the photosensitive component 10, a housing 22 mounted on the substrate 21, an optical lens 23 housed in the housing 22 and held on the light-sensitive path of the photosensitive component 10, and a driving component 30 for driving the optical lens 23 to move for optical performance adjustment. In particular, in the embodiment of the present application, the optical lens 23 and the driving component 30 have a special structural configuration such that the imaging module 300 can switch between the working state and the non-working state. Among them, in the non-working state, the imaging module 300 has a relatively small height dimension, and in the working state, the imaging module 300 has a relatively large effective focal length to solve the technical contradiction between the overall height dimension and the large effective focal length of the traditional upright imaging module 300.

[0055] Correspondingly, as As shown, in the embodiment of the present application, the photosensitive component 10 includes: a circuit board 11, a photosensitive chip 12, a bracket 13, and a filter element 14. Specifically, the photosensitive chip 12 is electrically connected to the circuit board 11 to provide the control circuit and electrical energy required for the operation of the photosensitive chip 12 through the circuit board 11. For example, in one example, the photosensitive chip 12 is mounted on the upper surface of the circuit board 11 and electrically connected to the circuit board 11 by wire bonding. Of course, in other examples of the present application, the photosensitive chip 12 can also be arranged on the circuit board 11 in other ways and / or electrically connected to the circuit board 11 in other ways. For example, it can be attached to the lower surface of the circuit board 11 by chip flip-chip, but this is not limited to the present application.

[0056] The bracket 13 is formed on the circuit board 11 to support other components. Among them, the bracket 13 has a light window corresponding to at least the photosensitive area of the photosensitive chip 12. In a specific example of the present application, the bracket 13 is implemented as a separately formed plastic bracket 13, which is attached to the surface of the circuit board 11 by an adhesive and used to support other components. Of course, in other examples of the present application, the bracket 13 can also be formed on the circuit board 11 in other ways. For example, the bracket 13 is implemented as a molded bracket 13, which is integrally formed at a preset position on the circuit board 11 by a molding process, but this is not limited to the present application.

[0057] The filter element 14 can be mounted on the bracket 13 to be held on the photosensitive path of the photosensitive chip 12. In this way, during the process that external light passes through the filter element 14 to reach the photosensitive chip 12, the stray light in the external light can be filtered by the filter element 14 to improve the imaging quality. It is worth mentioning that in other examples of the present application, the filter element 14 can also be mounted on the bracket 13 in other ways. For example, a filter element bracket (not shown in the figure) is first set on the bracket 13, and then the filter element 14 is mounted on the filter element bracket. That is, in this example, the filter element 14 can be indirectly mounted on the bracket 13 through other supporting members. And, in other examples of the present application, the filter element 14 can also be mounted at other positions of the imaging module 300. For example, the filter element 14 is formed in the optical lens 23 (for example, as a layer of filter film attached to the surface of a certain optical lens of the optical lens 23), but this is not limited to the present application.

[0058] To increase the bottom strength of the photosensitive component 10, in some examples of the present application, the photosensitive component 10 further includes a reinforcing plate (not shown in the figure) disposed on the lower surface of the circuit board 11. For example, a steel plate can be provided on the lower surface of the circuit board 11 to strengthen the strength of the circuit board 11 through the steel plate. Correspondingly, the reinforcing plate can be configured to have the same shape and size as the circuit board 11 to strengthen the whole of the circuit board 11 after being stacked on the lower surface of the circuit board 11.

[0059] As shown, in the embodiment of the present application, the base 21 is mounted on the bracket 13. Among them, the housing 22 mounted on the base 21 has a receiving cavity 220 and a first opening 221 communicating with the receiving cavity 220, and the optical lens 23 is received in the receiving cavity 220 of the housing 22. In particular, in the embodiment of the present application, the aperture of the first opening 221 is larger than the outer diameter of the optical lens 23 to allow the optical lens 23 to extend out of or retract into the receiving cavity 220 through the first opening 221.

[0060] In particular, in the embodiment of the present application, the optical lens 23 is implemented as a split lens, which includes at least two lens parts. For example, in the example shown, the split lens includes two lens parts: a first lens part 231 and a second lens part 232. Among them, the first lens part 231 includes a first lens barrel 2311 and at least one optical lens 230 installed in the first lens barrel 2311, and the second lens part 232 includes a second lens barrel 2321 and at least one optical lens 230 installed in the second lens barrel 2321. At least one optical lens 230 of the first lens part cooperates with at least one optical lens 230 of the second lens part 232 to form an imaging optical system.

[0061] Those of ordinary skill in the art should know that for the imaging optical system formed by the first lens part 231 and the second lens part 232, within the range of the predetermined number of optical lenses 230, the effective focal length of the imaging optical system is proportional to the number of optical lenses 230, and its resolution is also proportional to the number of optical lenses 230. That is, within the predetermined number range, the larger the effective focal length of the imaging optical system, the more the number of optical lenses 230 it contains; the better the resolution of the imaging optical system, the larger the number of optical lenses 230 it contains.

[0062] As described above, in the embodiments of the present application, with the popularization of mobile electronic devices, the related technologies of the camera module 300 applied to mobile electronic devices to help users obtain images have developed rapidly and made great progress. Currently in the market, it is expected that the camera module 300 configured in a mobile electronic device can achieve a multi - zoom shooting function or a telephoto shooting function, that is, it is required that the configured camera module 300 has a relatively large effective focal length. This requires that the imaging optical system of the configured optical lens 23 has a relatively large effective focal length, that is, the imaging optical system of the optical lens 23 needs to be configured with a relatively larger number of optical lenses 230.

[0063] Under such technical requirements, if the split - type lens is implemented as a conventional split - type lens, that is, there is a fixed relative position relationship between the first lens part 231 and the second lens part 232, then the split - type lens will have a relatively large height dimension, which will further cause the overall camera module 300 to have a relatively large height dimension, making it difficult to meet the assembly requirements of the thin and light of mobile electronic devices.

[0064] To solve the above - mentioned technical problems, the inventor of the present application attempts to configure the split - type lens as a dynamic split - type lens, that is, the relative position relationship between the first lens part 231 and the second lens part 232 can be adjusted. In this way, in the working state, the first lens part 231 and the second lens part 232 of the split - type lens are adjusted to a predetermined position to form a complete imaging optical system. In the non - working state, the first lens part 231 and the second lens part 232 of the split - type lens approach each other to reduce its overall height dimension, and thus reduce the overall height dimension of the camera module 300 to meet the assembly requirements of the thin and light of mobile electronic devices.

[0065] Therefore, in the embodiments of the present application, the driving component 30 is configured for the split - type lens to drive the split - type lens to switch between the working state and the non - working state through the driving component 30. Among them, in the working state, the driving component 30 drives the split - type lens to adjust the first lens part 231 and the second lens part 232 of the split - type lens to a predetermined position to form a complete imaging optical system; in the non - working state, the driving component 30 drives the first lens part 231 and the second lens part 232 in the split - type lens to approach each other to reduce its overall height dimension, and thus reduce the overall height dimension of the camera module 300 to meet the assembly requirements of the thin and light of mobile electronic devices.

[0066] Specifically, as As shown, in the embodiment of the present application, the driving assembly 30 includes a first driving element 31. Wherein, in the working state, the first driving element 31 is configured to drive the first lens part 231 to move along the direction set by the optical axis to adjust the first lens part 231 and the second lens part 232 to a predetermined position. Wherein, at this predetermined position, the effective focal length of the imaging optical system formed by the first lens part 231 and the second lens part 232 is within a preset range.

[0067] Specifically, in the embodiment of the present application, the first lens part 231 of the optical lens 23 corresponds to the first opening 221 and the aperture of the first opening 221 is larger than the outer diameter of the first lens part 231. Such a size configuration allows the first lens part 231 to extend or retract from the receiving cavity 220 through the first opening 221 under the drive of the first driving element 31, as shown. That is, in the embodiment of the present application, through the size configuration of the first opening 221, the first lens part 231 has a relatively large upward movement stroke. In this way, in the working state, the first lens part 231 can extend out of the housing 22 under the action of the first driving element 31 so that the first lens part 231 and the second lens part 232 can be adjusted to this predetermined position.

[0068] Furthermore, as shown, in the embodiment of the present application, the driving assembly 30 further includes a second driving element 32. Wherein, in the working state, the second driving element 32 is configured to drive the second lens part 232 to move along the direction set by the optical axis for optical focusing after the first driving element 31 adjusts the first lens part 231 and the second lens part 232 to this predetermined position. Specifically, in the embodiment of the present application, during the process of driving the second lens part 232 to move by the second driving element 32, the effective focal length of the optical system formed by the first lens part 231 and the second lens part 232 still remains within this preset range.

[0069] That is, in a specific example of the present application, in the working state, first, the second lens part 232 remains stationary, and the first driving element 31 drives the first lens part 231 to move along the optical axis to a predetermined position. Wherein, at this predetermined position, the effective focal length of the imaging optical system formed by the first lens part 231 and the second lens part 232 is within a preset range; then, the first lens part 231 remains stationary, and the second driving element 32 drives the second lens part 232 to move along the optical axis for optical focusing. In particular, during the process of driving the second lens part 232 to move by the second driving element 32, the effective focal length of the optical system formed by the first lens part 231 and the second lens part 232 still remains within this preset range, as shown.

[0070] It is worth mentioning that in other examples of the present application, the mode of the working state can also be set to other types. For example, in another specific example, the working state of the imaging module 300 is as follows: First, the second lens part 232 remains stationary, and the first driving element 31 drives the first lens part 231 to move along the optical axis to a predetermined position. Wherein, at this predetermined position, the effective focal length of the imaging optical system formed by the first lens part 231 and the second lens part 232 is within a preset range; then, the first driving element 31 and the second driving element 32 simultaneously drive the first lens part 231 and the second lens part 232 to move along the same direction of the optical axis for optical focusing. In this way, the rate of optical focusing can be improved. In particular, during the process of simultaneously driving the first lens part 231 and the second lens part 232 to move along the same direction of the optical axis by the first driving element 31 and the second driving element 32, the effective focal length of the optical system formed by the first lens part 231 and the second lens part 232 still remains within this preset range, as shown.

[0071] For another example, in yet another specific example, the working state of the imaging module 300 is as follows: First, the second lens portion 232 remains stationary, and the first driving element 31 drives the first lens portion 231 to move along the optical axis to a predetermined position, where the effective focal length of the imaging optical system formed by the first lens portion 231 and the second lens portion 232 is within a preset range at this predetermined position; then, the first lens portion 231 remains stationary, and the second driving element 32 drives the second lens portion 232 to move along the optical axis for optical zoom. That is, in this working mode, during the process of driving the second lens portion 232 to move by the second driving element 32, the effective focal length of the optical system formed by the first lens portion 231 and the second lens portion 232 changes.

[0072] It should be understood that in other examples of the present application, the working state mode of the imaging module 300 can also be set to other types, and this is not limited by the present application.

[0073] Correspondingly, in the non-working state, the first driving element 31 and / or the second driving element 32 drive the first lens portion 231 and / or the second lens portion 232 to approach each other, so as to reduce the overall size occupied by the first lens portion 231 and the second lens portion 232. For example, in a specific example, the non-working state is: the second lens portion 232 remains stationary, and the first driving element 31 drives the first lens portion 231 to approach the second lens portion 232 to reduce the distance between the first lens portion 231 and the second lens portion 232.

[0074] It is worth mentioning that in order to reduce the overall height size of the split lens in the non-working state as much as possible, preferably, in the embodiment of the present application, in the optical system formed by the first lens portion 231 and the second lens portion 232, the distance between the lowermost optical lens 230 in the first lens portion 231 and the uppermost optical lens 230 in the second lens portion 232 is the largest. That is, in the imaging optical system formed by the optical lens 23, a division is made between the two optical lenses 230 with the largest gap to divide the imaging optical system into two sub-optical system parts: the first lens portion 231 has a first sub-optical system, and the second lens portion 232 has a second sub-optical system. In this way, in the non-working state, the first lens portion 231 and the second lens portion 232 can be as close as possible to minimize the overall height size of the optical lens 23 in the non-working state.

[0075] Of course, in the embodiments of the present application, other methods may also be used to divide the imaging optical system formed by the optical lens 23, and the present application is not limited thereto.

[0076] It is worth mentioning that, in the embodiments of the present application, when in the working state, the gap between the first lens part 231 and the second lens part 232 reaches the gap required for the complete optical design. When in the non-working state, the first lens part 231 and the second lens part 232 approach each other. In this state, there may not necessarily be a continuous gap between the first lens part 231 and the second lens part 232, that is, the first lens part 231 and the second lens part 232 may be completely separated to have a continuous gap, or the first lens part 231 and the second lens part 232 may be partially in contact to have a discontinuous gap, and the present application is not limited thereto.

[0077] Specifically, in the embodiments of the present application, the first driving element 31 is implemented as a piezoelectric actuator. The imaging module 300 further includes a lens holder 24, wherein the lens holder 24 includes a cylindrical holder body 243 and support legs 242 extending outward and downward from the cylindrical holder body 243. An inner cavity of the cylindrical holder body 243 forms an installation cavity 240, and the first lens part 231 is installed in the installation cavity 240 of the lens holder 24. Further, the lens holder 24 further has a second opening 241 formed at an upper end of the lens holder 24 and communicating with the installation cavity 240. Correspondingly, the first driving element 31 is configured to drive the lens holder 24 to move along the direction set by the optical axis to drive the first lens part 231 to move along the direction set by the optical axis. That is, the piezoelectric actuator drives the lens holder 24 to drive the first lens part 231 to move along the direction set by the optical axis.

[0078] and The figure shows a schematic diagram of a specific example of the piezoelectric actuator according to the embodiments of the present application. As and shown, the piezoelectric actuator 100 includes: a piezoelectric active part 110, a driven shaft 120 drivably connected to the piezoelectric active part 110, and a driving part 130 tightly fitted with the driven shaft 120. The driving part 130 is configured to drive the lens holder 24 to drive the first lens part 231 to move along the direction set by the optical axis under the action of the piezoelectric active part 110 and the driven shaft 120.

[0079] In as and In the illustrated example, the piezoelectric active part 110 includes an electrode plate 111 and at least one piezoelectric substrate stacked on the electrode plate 111. The piezoelectric substrate is a substrate having an inverse piezoelectric effect and contracting or expanding according to the polarization direction and the electric field direction. For example, it can be made and used by polarizing a single crystal or polycrystalline ceramic, polymer, etc. in the thickness direction. Here, the inverse piezoelectric effect means that when an electric field is applied in the polarization direction of a dielectric, the dielectric will undergo mechanical deformation when a potential difference is generated.

[0080] More specifically, in the example as and shown in the illustration, the at least one piezoelectric substrate includes a first piezoelectric substrate 112 and a second piezoelectric substrate 113, and the electrode plate 111 is sandwiched between the first piezoelectric substrate 112 and the second piezoelectric substrate 113. And, in this example, the piezoelectric active part 110 further includes electrode layers 115 respectively formed on the upper surface and the lower surface of the first piezoelectric substrate 112, and electrode layers 115 respectively formed on the upper surface and the lower surface of the second piezoelectric substrate 113, so as to provide a pulsed voltage to the first piezoelectric substrate 112 and the second piezoelectric substrate 113 through the electrode layers 115 and the electrode plate 111.

[0081] In this example, the electrode plate 111 can be composed of a plate-shaped element with a certain elasticity. For example, it is composed of a metal plate with a certain elasticity. In the example as and shown in the illustration, the piezoelectric active part 110 further includes at least one electrically conductive part 114 electrically connected to the electrode plate 111. For example, the at least one electrically conductive part 114 can be welded to the electrode plate 111 by welding, or the at least one electrically conductive part 114 is integrally formed with the electrode plate 111. It is worth mentioning that when the number of the electrically conductive parts 114 is multiple, preferably, the multiple electrically conductive parts 114 are symmetrically distributed on the outer surface of the electrode plate 111.

[0082] In this example, the first piezoelectric substrate 112 and the second piezoelectric substrate 113 are respectively attached to the first side surface of the electrode plate 111 and the second side surface opposite to the first side surface through the electrode layers 115. For example, in this example, the first piezoelectric substrate 112 and the second piezoelectric substrate 113 can be fixed to the electrode plate 111 in a face-to-face meshing manner, or the first piezoelectric substrate 112 and the second piezoelectric substrate 113 are attached to the electrode plate 111 through conductive silver paste.

[0083] Preferably, in this example, the shapes and sizes of the first piezoelectric substrate 112 and the second piezoelectric substrate 113 are similar to or consistent with those of the electrode plate 111, so that the piezoelectric active part 110 has better vibration efficiency. In this specific example, the first piezoelectric substrate 112, the second piezoelectric substrate 113, and the electrode plate 111 are circular plates.

[0084] In the example illustrated as and the driven shaft 120 is fixed to the piezoelectric active part 110. For example, it is attached to the center of the piezoelectric active part 110 by an adhesive. Specifically, the driven shaft 120 can be attached to the electrode layer 115 on the outer surface of the first piezoelectric substrate 112 by an adhesive, or nestedly attached to the center hole of the electrode layer 115 on the outer surface of the first piezoelectric substrate 112 by an adhesive. Alternatively, the first piezoelectric substrate 112 has a center hole, and the driven shaft 120 is further fitted into the center hole of the first piezoelectric substrate 112. Or, the piezoelectric active part 110 has a center hole penetrating through its upper and lower surfaces, and the driven shaft 120 is fitted into the center hole of the piezoelectric active part 110 by an adhesive. In a specific implementation, the driven shaft 120 can be implemented as a carbon rod. The cross-sectional shape of the driven shaft 120 is circular or polygonal, preferably circular.

[0085] In the example illustrated as and the drive part 130 and the driven shaft 120 are in frictional engagement so that the drive part 130 is movably and tightly fitted on the driven shaft 120. In a specific implementation, the drive part 130 can be implemented as a clamping mechanism for clamping the driven shaft 120. Among them, preferably, the clamping mechanism can be a clamping mechanism with adjustable clamping force, or a clamping mechanism made of elastic material in part or in whole.

[0086] As and As shown, the electrode layer 115 exposed on the surface of the piezoelectric active part 110 is electrically connected to the positive electrode 117 of the power control part 116, and the electrode plate 111 is electrically connected to the negative electrode 118 of the power control part 116 through the electrical conduction part 114. In this way, when the power control part 116 repeatedly applies a pulsed voltage to the electrode layer 115 and the electrode plate 111, the first piezoelectric substrate 112 and the second piezoelectric substrate 113 deform in one direction under the action of the inverse piezoelectric effect, and quickly return to a flat shape under the elastic action of the electrode plate 111. During the above deformation process, the driven shaft 120 moves back and forth in its set axial direction. Since the driving part 130 and the driven shaft 120 are in frictional engagement, when the piezoelectric active part 110 deforms in one direction, the driving part 130 and the driven shaft 120 move together. When the piezoelectric active part 110 quickly returns to its original state, the driven shaft 120 moves reversely while the driving part 130 cannot follow the movement of the driven shaft 120 due to inertia and fails to return to its original position, but can only stay in its current position. Therefore, during one deformation process, the position of the driving part 130 changes. Accordingly, by repeatedly applying a pulsed voltage, the above movement can be repeated, so that the driving part 130 is moved to the target position.

[0087] FIG. illustrates one of the schematic diagrams of another embodiment of the piezoelectric actuator 100 according to an embodiment of the present application. FIG. illustrates another schematic diagram of another embodiment of the piezoelectric actuator 100 according to an embodiment of the present application. As and shown, in this example, the piezoelectric actuator 100 includes: a piezoelectric active part 110, a driven shaft 120 drivably connected to the piezoelectric active part 110, and a driving part 130 tightly fitted to the driven shaft 120, wherein the driving part 130 is configured to drive the first carrier 44 or the second carrier 45 under the action of the piezoelectric active part 110 and the driven shaft 120 to drive the zoom part or the focusing part to move along the optical axis.

[0088] As and shown, in this example, the piezoelectric active part 110 includes a piezoelectric element 111A, and the piezoelectric element 111A has a stacked structure as shown in. Specifically, as As shown, the piezoelectric element 111A includes a plurality of piezoelectric stack members 112A and a plurality of electrodes 113A, and the plurality of piezoelectric stack members 112A and the plurality of electrodes 113A are alternately stacked. In particular, with the above-described stacked structure, the piezoelectric element 111A can obtain a relatively large amount of deformation even when a very small electric field is applied.

[0089] In this example, for ease of explanation, the electrodes 113A sandwiching the plurality of piezoelectric stack members 112A alternately are defined as internal electrodes, and the electrodes 113A disposed on the surfaces of the piezoelectric stack members 112A and located on the upper and lower surfaces of the piezoelectric element 111A are defined as the upper electrode and the lower electrode, respectively. At the same time, the electrodes 113A disposed on the surfaces of the piezoelectric stack members 112A and located on the side surfaces of the piezoelectric element 111A are defined as side electrodes. Accordingly, in the case of multiple layers, the electrodes 113A of the same polarity are electrically connected through the side electrodes.

[0090] As shown, in this example, the driven shaft 120 has a cylindrical shape and is attached to the middle region of the upper surface of the piezoelectric element 111A by an adhesive so that the driven shaft 120 is joined to the piezoelectric element 111A. Of course, in other examples of the present application, the shape of the driven shaft 120 can also be adjusted, and this is not limited to the present application.

[0091] Moreover, the driven shaft 120 is made of a material having any one of "carbon, heavy metals, carbides of heavy metals, borides of heavy metals, and nitrides of heavy metals" as the main component. The piezoelectric element 111A has a cuboid shape and has sides along the X-axis, Y-axis, and Z-axis that are orthogonal to each other. In this example, the length of the piezoelectric element 111A in the X-axis direction is 1 mm, the length of the piezoelectric element 111A in the Y-axis direction is 1 mm, and the length (height) of the piezoelectric element 111A in the Z-axis direction is 2 mm.

[0092] It is worth mentioning that compared with traditional electromagnetic actuators, and as shown, the piezoelectric actuator 100 has the advantages of small volume, large thrust, and high precision. Moreover, compared with and the piezoelectric actuator 100 shown, and as shown, the piezoelectric active part 110 of the piezoelectric actuator 100 has a relatively smaller cross-sectional size and is suitable for use in a module with a compact space. However, its thickness dimension is relatively large, and at the same time, the internal structure of the piezoelectric element 111A is relatively complex.

[0093] Accordingly, the piezoelectric actuator 100 according to the embodiment of the present application can provide a relatively high driving force. More specifically, the driving force that the selected piezoelectric actuator 100 of the present application can provide ranges from 0.6 N to 2 N, which is sufficient to drive a component with a weight greater than 100 mg.

[0094] Moreover, in addition to being able to provide a relatively large driving force, compared with the traditional electromagnetic motor solution and the shape memory alloy motor solution, the piezoelectric actuator 100 also has other advantages, including but not limited to: relatively small size (elongated shape), better response accuracy, relatively simpler structure, relatively simpler drive control, high product consistency, no electromagnetic interference, relatively larger stroke, short settling time, relatively small weight, etc.

[0095] More specifically, in the embodiment of the present application, and the piezoelectric actuator 100 shown is used as the first driving element 31. And, in the embodiment of the present application, the driving part 130 of the piezoelectric actuator 100 is installed on the side of the lens holder 24, and the piezoelectric active part 110 of the piezoelectric actuator 100 is installed on the base 21. In a specific example, the driving part 130 and the lens holder 24 are integrally formed, that is, the driving part 130 and the lens holder 24 have an integrated structure.

[0096] In order to make the movement of the first lens part 231 smoother and the first lens part 231 not tilt greatly, preferably, in the embodiment of the present application, as shown, the driving assembly 30 further includes a guiding mechanism 33 for guiding the lens holder 24 to move along the direction set by the optical axis. As shown, in this embodiment, the guiding mechanism 33 is implemented as a guide rod structure. It is worth mentioning that in other examples of the present application, the guiding mechanism 33 can also be implemented as a slider structure or a ball structure, and the present application is not limited thereto.

[0097] Particularly, in the embodiment of the present application, the first driving element 31 and the guiding mechanism 33 are located on the opposite first side and second side of the lens holder 24. That is, the piezoelectric actuator 100 and the guiding mechanism 33 are located on the opposite sides of the lens holder 24. In this way, the piezoelectric actuator 100 drives the lens holder 24 on the first side of the lens holder 24, and the guiding mechanism 33 guides the movement of the lens holder 24 on the second side of the lens holder 24 to improve the smoothness of the movement of the lens holder 24 and prevent it from tilting during the movement.

[0098] It is worth mentioning that, preferably, in the embodiments of the present application, the outer diameter of the upper end portion of the lens holder 24 is equal to the inner diameter of the first opening 221, so that the lens holder 24 is clamped in the first opening 221. That is, the lens holder 24 is tightly fitted in the first opening 221, and, more preferably, the first opening 221 and the upper end portion of the lens holder 24 have the same shape, so as to improve the sealing performance of the housing 22 in this way and prevent sundries such as dust and water vapor from entering the interior of the housing 22 through the gap between the lens holder 24 and the first opening 221. More preferably, in order to further improve the sealing performance of the imaging module 300, the second opening 241 of the lens holder 24 is further sealed. For example, a light-transmitting cover plate 25 (such as a glass cover plate) is provided on the second opening 241, so as to prevent sundries such as dust and water vapor from entering the interior of the lens holder 24 through the second opening 241 by means of the light-transmitting cover plate 25.

[0099] It is also worth mentioning that, although in the example shown as taking the first lens portion 231 including a lens barrel as an example, it should be understood that in other examples of the present application, the first lens portion 231 may not be provided with the first lens barrel 2311, and the lens holder 24 may be used as a carrier member for at least one optical lens 230 of the first lens portion 231. That is, in other examples of the present application, the first lens portion 231 only includes at least one optical lens 230, and the at least one optical lens 230 is installed in the installation cavity 240 of the lens holder 24.

[0100] Furthermore, in the embodiments of the present application, the second driving element 32 is implemented as a conventional electromagnetic motor, including but not limited to a leaf spring type electromagnetic motor, a ball type electromagnetic motor, etc. Specifically, the second driving element 32 includes a driving carrier having an installation cavity 240 and a coil-magnet pair for driving the driving carrier to move, wherein the second lens portion 232 is installed in the installation cavity 240 of the driving carrier, and the driving carrier moves along the optical axis under the action of the coil-magnet pair to drive the second lens portion 232 to move.

[0101] Particularly, as As shown, in the embodiment of the present application, the first driving element 31 and the second driving element 32 are arranged side by side in the height direction of the imaging module 300, and the second driving element 32 is located inside the first driving element 31. Such a position setting is beneficial to the layout of the first driving element 31 and the second driving element 32 in the housing 22. Moreover, since the first driving element 31 is a piezoelectric actuator 100 and the second driving element 32 is an electromagnetic motor, there will be no interference between the first driving element 31 and the second driving element 32. Also, in the embodiment of the present application, the first lens portion 231 requires a relatively large stroke, and the stroke of the second lens portion 232 is relatively small. Therefore, configuring the piezoelectric actuator 100 for the first lens portion 231 and the electromagnetic motor for the second lens portion 232 can also meet the stroke requirements of both.

[0102] More specifically, as shown, the second driving element 32 is disposed in the space formed by the support legs 242 of the lens bracket 24, such that the second driving element 32 is located inside the first driving element 31 in this way.

[0103] It is worth mentioning that although in the example shown as shown, the second lens portion 232 includes a lens barrel as an example, those of ordinary skill in the art should know that in other examples of the present application, the second lens portion 232 may also not be configured with the second lens barrel 2321 and instead select the motor carrier of the second driving element 32 as its bearing component. That is, in other examples of the present application, the second lens portion 232 only includes at least one optical lens 230, and the at least one optical lens 230 is installed in the installation cavity 240 of the motor carrier.

[0104] Furthermore, in order to prevent the first lens portion 231 and the second lens portion 232 from colliding and further limit the second lens portion 232, as shown, in the embodiment of the present application, the imaging module 300 further includes a limiting element 26 disposed above the second lens portion 232, for limiting the maximum height of the upward movement of the second lens portion 232. It should be noted that the limiting element 26 is disposed between the first lens portion 231 and the second lens portion 232. Therefore, it can also prevent crosstalk between the first lens portion 231 and the second lens portion 232, for example, collisions and the like.

[0105] Specifically, as As shown, in this embodiment, the limiting element 26 has a limiting cavity 260 formed on its side. The second lens barrel 2321 includes a second lens barrel main body 2322 and a blocking arm 2323 extending outward from the second lens barrel main body 2322 and extending into the limiting cavity 260, so as to limit the movement of the second lens part 232 within the height range set by the limiting cavity 260 through the blocking arm 2323 and the limiting cavity 260. Specifically, when the second lens part 232 is driven by the second driving element 32 to move upward, the upper limit of its stroke is that the blocking arm 2323 touches the upper surface of the limiting cavity 260. In this way, the maximum height of the upward movement of the second lens part 232 is limited.

[0106] Particularly, when the imaging module 300 is in a non-operating state, the first lens part 231 can rest on the upper surface of the limiting element 26 to provide support for the first lens part 231. And, in this way, the space inside the housing 22 can also be fully utilized to compress the overall height of the housing 22, thereby realizing the miniaturization of the structure of the imaging module 300.

[0107] In order to protect the second lens part 232, as shown, in the embodiment of the present application, the imaging module 300 further includes an isolation element 27 disposed around the second lens part 232. The isolation element 27 forms an isolation cavity, and the second lens part 232 is located in the isolation cavity.

[0108] In the example shown as shown, the isolation element 27 and the limiting element 26 have an integral structure. Specifically, in this example, the limiting element 26 is disposed around the second lens part 232 to form the isolation element 27. That is, in this example, the limiting element 26 has an annular structure, and the isolation element 27 and the limiting element 26 are the same component. It is worth mentioning that in other examples of the present application, the isolation element 27 and the limiting element 26 can also be implemented as separate components, and this is not limited by the present application.

[0109] It should be noted that as As shown, in the embodiment of the present application, the lens holder 24 has an irregular outer surface shape, and the limiting element 26 has an irregular outer surface shape. In this way, the lens holder 24 and the limiting element 26 can cooperate with the housing 22 to form at least one meandering flow channel. When external dust, water vapor and other sundries enter the interior of the housing 22 through the gap, these sundries can occur and deposit in the at least one flow channel to prevent them from entering the first lens portion 231 and the second lens portion 232 or touching the photosensitive chip 12.

[0110] Further, as shown, the driving assembly 30 further includes a third driving element 34, and the third driving element 34 is configured to drive the photosensitive assembly 10 to move in a plane perpendicular to the optical axis for optical image stabilization. In a specific embodiment, the third driving element 34 can drive the entire photosensitive assembly 10 to move in a plane perpendicular to the optical axis for optical image stabilization, or the third driving element 34 only drives the photosensitive chip 12 to move in a plane perpendicular to the optical axis for optical image stabilization. However, this is not limited by the present application.

[0111] Particularly, in the embodiment of the present application, the third driving element 34 is implemented as a shape memory alloy actuator. That is, in the embodiment of the present application, the driving assembly 30 combines three types of motors, namely a piezoelectric actuator, an electromagnetic motor, and a shape memory alloy actuator, to meet the optical performance adjustment requirements of the imaging module 300: the optical focusing and / or optical zoom functions are realized through the piezoelectric actuator 100 and the electromagnetic motor, and the optical image stabilization function is realized through the shape memory alloy actuator.

[0112] In summary, the camera module 300 based on the embodiment of the present application is explained, wherein the camera module 300 staggers the contradiction between the overall height dimension and the larger effective focal length of the upright camera module 300 in time distribution. Specifically, the camera module 300 has a relatively small height dimension in the non-working state, and has a relatively large effective focal length in the working state, so as to meet the terminal device's requirements for the overall height dimension of the camera module 300 in the non-working state, and meet the requirements for the larger effective focal length of the camera module 300 in the working state. More specifically, the camera module 300 uses a split lens including at least two lens parts as its imaging lens, and in a working state, a driver is used to adjust the relative position relationship between the at least two lens parts so that the effective focal length of the optical system formed by the at least two lens parts is within a preset range. In this way, the camera module 300 has a relatively small height dimension in a non-working state, and has a relatively large effective focal length in a working state. In this way, the technical contradiction between the overall height dimension and the larger effective focal length of the traditional upright camera module 300 is solved.

[0113] According to another aspect of the present application, a lens assembly 20 is also provided, wherein the lens assembly 20 includes an optical lens 23 provided with an optical axis, including a first lens portion 231 and a second lens portion 232 arranged along the optical axis, the first lens portion 231 including at least one optical lens 230, the second lens portion 232 including at least one optical lens 230, wherein there is a gap between the first lens portion 231 and the second lens portion 232; and a driving assembly 30, including a first driving element 31, the first driving element 31 is configured to drive the first lens portion 231 to move along the direction set by the optical axis to adjust the first lens portion 231 and the second lens portion 232 to a predetermined position, wherein, at the predetermined position, the effective focal length of the optical system formed by the first lens portion 231 and the second lens portion 232 is within a preset range.

[0114] In the above-mentioned lens assembly 20, in a specific example, the driving assembly 30 also includes a second driving element 32, and the second driving element 32 is configured to drive the second lens part 232 to move along the direction set by the optical axis for optical focusing after the first driving element 31 adjusts the first lens part 231 and the second lens part 232 to the predetermined position; wherein, in the process of the second driving element 32 driving the second lens part 232 to move, the effective focal length of the optical system formed by the first lens part 231 and the second lens part 232 remains within the preset range.

[0115] In the above lens assembly 20, in a specific example, the driving assembly 30 further includes a second driving element 32, which is configured to drive the second lens portion 232 to move along the direction set by the optical axis for optical zooming after the first driving element 31 adjusts the first lens portion 231 and the second lens portion 232 to the predetermined position.

[0116] In the above lens assembly 20, in a specific example, in the optical system formed by the first lens portion 231 and the second lens portion 232, the distance between the optical lens 230 at the lowermost part in the first lens portion 231 and the optical lens 230 at the uppermost part in the second lens portion 232 is the largest.

[0117] In the above lens assembly 20, in a specific example, the lens assembly 20 further includes a base 21 and a housing 22 supported by the base 21. The housing 22 has a receiving cavity 220 and a first opening 221 communicating with the receiving cavity 220. Among them, the optical lens 23 is received in the receiving cavity 220 of the housing 22. The first lens portion 231 of the optical lens 23 corresponds to the first opening 221, and the aperture of the first opening 221 is larger than the outer diameter of the first lens portion 231 to allow the first lens portion 231 to extend out of or retract into the receiving cavity 220 through the first opening 221 under the drive of the first driving element 31.

[0118] In the above lens assembly 20, in a specific example, the lens assembly 20 further includes a lens bracket 24. The lens bracket 24 has a mounting cavity 240 and a second opening 241 formed at the upper end of the lens bracket 24 and communicating with the mounting cavity 240. Among them, the first lens portion 231 is mounted in the mounting cavity 240 of the lens bracket 24, and the first driving element 31 is configured to drive the lens bracket 24 to move along the direction set by the optical axis to drive the first lens portion 231 to move along the direction set by the optical axis.

[0119] In the above lens assembly 20, in a specific example, the first driving element 31 is implemented as a piezoelectric actuator 100.

[0120] In the above lens assembly 20, in a specific example, the driving assembly 30 further includes a guiding mechanism 33 for guiding the lens bracket 24 to move along the direction set by the optical axis.

[0121] In the above lens assembly 20, in a specific example, the first driving element 31 and the guiding mechanism 33 are located on the opposite first side and second side of the lens holder 24.

[0122] In the above lens assembly 20, in a specific example, the outer diameter of the upper end portion of the lens holder 24 is equal to the inner diameter of the first opening 221, so that the lens holder 24 is clamped in the first opening 221.

[0123] In the above lens assembly 20, in a specific example, the lens assembly 20 further includes a light-transmitting cover plate 25 for sealing the second opening 241.

[0124] In the above lens assembly 20, in a specific example, the lens holder 24 includes a cylindrical bracket 13 main body and support legs 242 extending outward and downward from the cylindrical bracket 13 main body, wherein the inner cavity of the cylindrical bracket 13 main body forms the installation cavity 240.

[0125] In the above lens assembly 20, in a specific example, the second driving element 32 is implemented as an electromagnetic motor, and the second lens portion 232 is mounted on the electromagnetic motor.

[0126] In the above lens assembly 20, in a specific example, the second driving element 32 is located inside the first driving element 31.

[0127] In the above lens assembly 20, in a specific example, the second driving element 32 is implemented as an electromagnetic motor, wherein the second driving element 32 is located inside the first driving element 31.

[0128] In the above lens assembly 20, in a specific example, the second driving element 32 is disposed in the space formed by the support legs 242 of the lens holder 24, so that the second driving element 32 is located inside the first driving element 31.

[0129] In the above lens assembly 20, in a specific example, the lens assembly 20 further includes a limiting element 26 disposed above the second lens portion 232 for limiting the maximum height of the upward movement of the second lens portion 232.

[0130] In the above lens assembly 20, in a specific example, the lens further includes an isolation element 27 disposed around the second lens portion 232, and the isolation element 27 forms an isolation cavity, and the second lens portion 232 is located in the isolation cavity.

[0131] Exemplary electronic device

[0132] According to another aspect of the present application, an electronic device is also provided.

[0133] The schematic diagram of the electronic device according to the embodiment of the present application is shown. As shown, the electronic device 200 according to the embodiment of the present application includes an electronic device body 210 and the above-described camera module 300 assembled to the electronic device body 210.

[0134] In a specific implementation, the camera module 300 can be deployed on the back of the electronic device body 210 and applied as a rear camera module 300. Of course, it can also be set on the front of the electronic device body 210 and applied as a front camera module 300. The specific installation position of the camera module 300 on the electronic device body 210 is not limited by the present application.

[0135] Particularly, compared with the conventional upright camera module 300, in its working state, the camera module 300 can extend the first lens portion 231 of its optical lens 23 to increase its total optical length until the shooting requirement is met, as shown.

[0136] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments. Without departing from the above principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. A lens assembly, characterized in that, Comprising: An optical lens having an optical axis, including a first lens portion and a second lens portion arranged along the optical axis, the first lens portion including at least one optical lens, the second lens portion including at least one optical lens, wherein there is a gap between the first lens portion and the second lens portion; A substrate; A housing supported by the substrate, the housing having a receiving cavity and a first opening communicating with the receiving cavity, wherein the optical lens is received in the receiving cavity of the housing; and A driving assembly, including a first driving element and a second driving element; the first driving element is configured to drive only the first lens portion to move along the direction set by the optical axis so that the first lens portion moves to a predetermined position, wherein, at this predetermined position, the effective focal length of the optical system formed by the first lens portion and the second lens portion is within a preset range; the second driving element is configured to drive the second lens portion to move along the direction set by the optical axis for optical focusing or optical zooming after the first driving element adjusts the first lens portion and the second lens portion to this predetermined position; during the process of driving the second lens portion to move by the second driving element for optical focusing, the effective focal length of the optical system formed by the first lens portion and the second lens portion remains within this preset range; the first driving element is implemented as a piezoelectric actuator; the second driving element is implemented as an electromagnetic motor, and the second lens portion is mounted on the electromagnetic motor; the second driving element is located inside the first driving element; The first lens portion of the optical lens corresponds to the first opening and the aperture of the first opening is larger than the outer diameter of the first lens portion to allow the first lens portion to extend out of or retract into the receiving cavity through the first opening under the drive of the first driving element; The second lens portion of the optical lens is always limited within the receiving cavity.

2. The lens assembly according to claim 1, wherein, In the optical system formed by the first lens portion and the second lens portion, the distance between the lowermost optical lens in the first lens portion and the uppermost optical lens in the second lens portion is the largest.

3. The lens assembly according to claim 1, further comprising a lens holder having a mounting cavity, and a second opening formed at an upper end portion of the lens holder and communicating with the mounting cavity, wherein, The first lens portion is mounted in the mounting cavity of the lens bracket, and the first driving element is configured to drive the lens bracket to move along the direction set by the optical axis to drive the first lens portion to move along the direction set by the optical axis.

4. The lens assembly according to claim 3, wherein, The driving assembly further includes a guiding mechanism for guiding the lens bracket to move along the direction set by the optical axis.

5. The lens assembly according to claim 4, wherein, The first driving element and the guiding mechanism are located on the first side and the second side opposite to the lens bracket.

6. The lens assembly according to claim 5, wherein, The outer diameter of the upper end portion of the lens bracket is equal to the inner diameter of the first opening so that the lens bracket is clamped in the first opening.

7. The lens assembly according to claim 6, further comprising a light-transmissive cover plate for sealing the second opening.

8. The lens assembly according to claim 7, wherein, The lens bracket includes a cylindrical bracket body and support legs extending outward and downward from the cylindrical bracket body. Among them, the inner cavity of the cylindrical bracket body forms the installation cavity.

9. The lens assembly according to claim 8, wherein, The second driving element is disposed in the space formed by the support legs of the lens bracket, so that the second driving element is located inside the first driving element.

10. The lens assembly according to claim 9, further comprising a limiting element disposed above the second lens portion for limiting the maximum height of upward movement of the second lens portion.

11. The lens assembly according to claim 10, further comprising an isolation element disposed around the second lens portion. The isolation element forms an isolation cavity, and the second lens portion is located in the isolation cavity.

12. An imaging module, characterized in that, Comprising: a photosensitive component, including a circuit board and a photosensitive chip electrically connected to the circuit board; and The lens assembly according to any one of claims 1 to 11, wherein the lens assembly is held on the photosensitive path of the photosensitive component.

13. The camera module according to claim 12, wherein, The driving assembly of the camera module further includes a third driving element configured to drive the photosensitive component to move in a plane perpendicular to the optical axis for optical image stabilization.

14. The imaging module according to claim 13, wherein, The third driving element is configured to drive the photosensitive chip of the photosensitive component to move in a plane perpendicular to the optical axis for optical image stabilization.

15. The imaging module according to claim 14, wherein, The third driving element is implemented as a shape memory alloy actuator.

Images