CN115086509A - Periscopic camera module - Google Patents

Abstract

Disclosed is a periscopic camera module, which comprises: a housing; a light turning assembly pivotably mounted within the housing, including a carrier and a light turning element mounted to the carrier, the light turning element configured to turn imaging light rays from a subject; a lens group held on a light turning path of the light turning component; the photosensitive assembly is held on the light emitting path of the lens group and comprises a circuit board and a photosensitive chip electrically connected with the circuit board; and a drive assembly, wherein the drive assembly comprises a piezoelectric actuator configured to provide a linear force to drive the light turning assembly to pivot. In particular, the periscopic camera module uses a piezoelectric actuator as a driver to pivot the light turning component so as to realize optical anti-shake. And moreover, the piezoelectric actuators are arranged in the periscopic camera module by adopting a reasonable arrangement scheme.

Description

Periscopic camera module

Technical Field

The application relates to the module field of making a video recording, especially relates to periscopic module of making a video recording, wherein, periscopic module of making a video recording adopts piezoelectric actuator to pivot light turn subassembly as the driver in order to realize optics anti-shake. And moreover, the piezoelectric actuators are arranged in the periscopic camera module by adopting a reasonable arrangement scheme.

Background

With the popularization of mobile electronic devices, technologies related to camera modules used in mobile electronic devices for assisting users in capturing images (e.g., videos or images) have been rapidly developed and advanced. In recent years, in order to meet the functional demand that mobile electronic devices (e.g., smartphones) can realize multi-zoom photographing, periscopic camera modules capable of solving the technical contradiction between the height size of the camera module and the high zoom have been widely used.

Compare in traditional vertical type camera module, the periscopic camera module is equipped with the light turning component (for example, prism, speculum etc.) and changes its optical imaging route to satisfy the optical design demand that has great effective focal length when realizing reducing the whole height dimension of camera module.

In order to improve the stability of the imaging performance of the periscopic camera module, in some existing periscopic camera modules, the scheme of driving the light turning element to rotate by the driving element is adopted to realize optical anti-shake. The driving element in the mainstream is an electromagnetic Motor, such as Voice Coil Motor (VCM), Shape Memory Alloy Actuator (SMA), and the like. The electromagnetic motor is well used in the conventional upright camera module, but when the electromagnetic motor is used in the periscopic camera module to achieve the optical anti-shake, the performance is not good, for example, the structure is relatively complex, the driving force provided by the electromagnetic motor is relatively small, the driving stroke is relatively small, and the like.

Compare in traditional vertical type module of making a video recording, periscopic module of making a video recording etc. neotype module of making a video recording has changed the module of making a video recording for mobile electronic equipment's structure and position relation, provides bigger space for drive element's arrangement and selection.

Therefore, an optical anti-shake driving scheme for a periscopic imaging module is desired.

Disclosure of Invention

An advantage of the present application is to provide a periscopic camera module, wherein, the periscopic camera module adopts piezoelectric actuator to pivot light turning subassembly as the driver in order to realize optics anti-shake, and it not only can provide the drive power that is big enough, moreover, can provide the drive performance that the precision is higher and the stroke is longer.

Another advantage of the present application is to provide a periscopic camera module, wherein the piezoelectric actuator has a relatively small size and a more simplified structure to facilitate the arrangement of the piezoelectric actuator in the periscopic camera module.

Yet another advantage of the present application is to provide a periscopic camera module, wherein the piezoelectric actuators are arranged in the periscopic camera module using a reasonable arrangement scheme, so as to meet the structural and dimensional requirements of the periscopic camera module.

Other advantages and features of the present application will become apparent from the following description and may be realized by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to realize above-mentioned at least one advantage, this application provides a periscopic module of making a video recording, and it includes:

a housing;

a light turning assembly pivotably mounted within the housing, wherein the light turning assembly includes a carrier and a light turning element mounted to the carrier, the light turning element configured to turn imaging light rays from a subject;

a lens group held on a light turning path of the light turning component;

the photosensitive assembly is held on the light emitting path of the lens group and comprises a circuit board and a photosensitive chip electrically connected with the circuit board; and

a drive assembly, wherein the drive assembly comprises a piezoelectric actuator configured to provide a linear force to drive the light-turning assembly to pivot.

In a periscopic camera module according to the present application, the carrier comprises a carrier body and a pivot shaft protrudingly extending from the carrier body, the pivot shaft being pivotably mounted within the housing such that the light turning assembly can pivot about the pivot shaft.

In the periscopic camera module according to the present application, the carrier body has an upper corner edge, a lower corner edge and a carrying surface extending obliquely between the upper corner edge and the lower corner edge, and the light turning element is mounted on the carrying surface.

In a periscopic camera module according to the present application, the pivot axis is adjacent to the upper corner edge.

In a periscopic camera module according to the present application, the pivot axis is adjacent to the lower corner edge.

In the periscopic camera module according to the application, the pivot shaft is arranged in the middle area of the carrier body.

In a periscopic camera module according to the present application, the carrier body has a pushing surface, the driving assembly further comprises a pushing block drivingly connected to the piezoelectric actuator, the pushing block has a contact surface abutting against the pushing surface, wherein when the piezoelectric actuator is configured to provide a linear force to the pushing block, the contact surface of the driven pushing block acts on the pushing surface of the carrier body to drive the carrier body and the light-turning element to pivot about the pivot axis.

In the periscopic camera module according to the application, piezoelectric actuator includes piezoelectricity active part, from the driven shaft that piezoelectricity active part extends and the drive division of tight fit with the driven shaft, wherein, the drive division is set up in promote the piece, the drive division is in piezoelectricity active part with the effect of driven shaft is configured as and provides linear effort in promote the piece.

In the periscopic camera module according to the present application, the piezoelectric actuator is configured to provide a linear force to the push block so that the push block is laterally moved leftward or rightward.

In the periscopic camera module according to the present application, the piezoelectric actuator is configured to provide a linear force to the push block so that the push block is vertically moved upward or downward.

In a periscopic camera module according to the present application, the driven shaft of the piezoelectric actuator extends transversely with respect to the carrier.

In a periscopic camera module according to the present application, the driven shaft of the piezoelectric actuator extends longitudinally relative to the carrier.

In the periscopic camera module according to the application, the piezoelectric active part of the piezoelectric actuator is mounted on the bottom wall of the shell.

In the periscopic camera module according to the application, the piezoelectric active part of the piezoelectric actuator is mounted on the side wall of the shell.

In the periscopic camera module according to the present application, when the piezoelectric actuator does not work, the contact surface of the pushing block abuts against the pushing surface of the carrier body.

In the periscopic camera module according to the application, the cross-sectional shape of the carrier main body is triangular, and the carrier main body is provided with the pushing surface which forms a preset angle with the bearing surface of the carrier main body.

In the periscopic camera module according to the present application, the predetermined angle is greater than or equal to 25 degrees and less than 45 degrees.

In the periscopic camera module according to the application, the carrier main body is provided with an inwards sunken pushing cavity which is provided with the pushing surface.

In the periscopic camera module according to the application, at least one part of the piezoelectric actuator is accommodated in the pushing cavity.

In a periscopic camera module according to the present application, the driven shaft of the piezoelectric actuator extends laterally within the push chamber.

In a periscopic camera module according to the present application, the piezoelectric actuator driven shaft extends longitudinally within the push chamber.

In the periscopic camera module according to the present application, the magnitude of the linear acting force generated by the piezoelectric actuator is 0.6N to 2N.

Further objects and advantages of the present application will become apparent from an understanding of the ensuing description and drawings.

These and other objects, features and advantages of the present application will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.

Fig. 1 illustrates a schematic diagram of a periscopic camera module according to an embodiment of the present application.

Fig. 2 illustrates a schematic view of an optical system of the periscopic camera module according to an embodiment of the present application.

Fig. 3 illustrates a schematic view of a specific example of a light blocking element of the periscopic camera module according to an embodiment of the present application.

Fig. 4A and 4B illustrate schematic views of the piezoelectric actuator of the periscopic camera module according to the embodiment of the present application.

Fig. 5A illustrates one of schematic views of another embodiment of the piezoelectric actuator of the periscopic camera module according to an embodiment of the present application.

Fig. 5B illustrates a second schematic diagram of another embodiment of the piezoelectric actuator of the periscopic camera module according to the present application.

Fig. 6A is a schematic diagram illustrating a light turning component of the periscopic camera module acted on by the piezoelectric actuator according to an embodiment of the present application.

Fig. 6B illustrates a second schematic diagram of the optical turning element of the periscopic camera module acted on by the piezoelectric actuator according to the embodiment of the present application.

Fig. 6C is a third schematic diagram illustrating the light turning element of the periscopic camera module being acted on by the piezoelectric actuator according to the embodiment of the present application.

Fig. 7A illustrates one of the schematic diagrams of the light-turning component being acted on by the piezoelectric actuator in a variant implementation of the periscopic camera module according to an embodiment of the present application.

Fig. 7B is a second schematic diagram illustrating the light turning component being acted on by the piezoelectric actuator in a variant implementation of the periscopic camera module according to an embodiment of the present application.

Fig. 7C is a third schematic diagram illustrating the light turning element being acted on by the piezoelectric actuator in a modified implementation of the periscopic camera module according to an embodiment of the present application.

Fig. 8 illustrates a schematic diagram of the light-turning component and the piezoelectric actuator in another variant implementation of the periscopic camera module according to an embodiment of the present application.

Detailed Description

Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein.

Summary of the application

As described above, conventional driving elements for driving the optical turning element in the periscopic camera module to perform optical anti-shake are electromagnetic motors, such as Voice Coil Motors (VCM), Shape Memory Alloy actuators (SMA), and the like. Since the conventional upright camera module is disposed along the thickness direction of an electronic device such as a mobile phone, the components in the camera module tend to be light, thin and small, and in this case, the electromagnetic motor can provide a sufficient driving force. However, the structure and the positional relationship of the camera module relative to the electronic device are changed along with the periscopic camera module and other novel camera modules, that is, the camera module can be arranged along the length or the width direction of the electronic device, so that the camera module is not limited by the thickness direction of the electronic device, and the camera module can obtain a larger degree of freedom in the aspect of size increase.

And, along with the improvement of the requirement to the imaging performance of the module of making a video recording, higher requirement has been put forward to the sensitization chip of the module of making a video recording. With the reduction of the limitation in terms of the increase in size, in order to realize a stronger function, the size of the components (including the optical lens, the light turning element, and the like) in the camera module, which are fitted to the photosensitive chip, is also increased accordingly, resulting in a further increase in the weight of the components, for example, the light turning element.

Under the circumstances, the conventional electromagnetic motor can no longer provide enough driving force, and in view of that, the existing voice coil motor driver can only drive the part (for example, the optical lens) with the weight less than 100mg, while the memory alloy motor needs a larger stroke space, that is, if the weight of the component to be driven in the camera module exceeds 100mg, the existing driver cannot meet the application requirement of the optical anti-shake of the periscopic camera module, so a new generation of driving scheme must be developed for the camera module.

Based on this, the technical route of this application provides one kind and satisfies the optical anti-shake's of periscopic camera module design requirement based on the piezoelectric actuator that can provide bigger drive power to satisfy the demand to subassembly drive power after the subassembly in the novel periscopic camera module is upsized.

Here, as can be understood by those skilled in the art, since the technical requirements of the novel periscopic camera module are completely opposite to those of the conventional periscopic camera module which needs to be miniaturized, a whole set of design scheme based on the technical requirements of the novel periscopic camera module is required in the technical route for the novel periscopic camera module, and not only is the novel actuating element simply applied to the design of the conventional periscopic camera module.

Specifically, the technical scheme of this application provides a periscopic camera module, includes: a housing; a light-turning assembly pivotably mounted within the housing, wherein the light-turning assembly includes a carrier and a light-turning element mounted to the carrier, the light-turning element configured to turn imaging light from a subject; a lens group held on a light turning path of the light turning component; the photosensitive assembly is held on the light emitting path of the lens group and comprises a circuit board and a photosensitive chip electrically connected with the circuit board; and a drive assembly, wherein the drive assembly comprises a piezoelectric actuator configured to provide a linear force to drive the light turning assembly to pivot.

In this way, by configuring the overall structure of the periscopic camera module based on the piezoelectric actuator capable of providing a larger driving force, and using the piezoelectric actuator as the driving element of the light turning component that needs to be rotated, the light turning component of the periscopic camera module with a larger weight, that is, the light turning component with a weight much larger than 100mg, for example, until the weight exceeds 1 g, can be driven. Moreover, even if the stroke provided by the single deformation of the piezoelectric actuator is limited, the optical component to be moved can be moved for a long distance in a mode of superposing the strokes provided by multiple deformations, and the time of the single deformation and recovery of the piezoelectric actuator is short, so that the requirement on zooming time can be completely met.

Exemplary periscopic camera module

Fig. 1 illustrates a schematic diagram of a periscopic camera module according to an embodiment of the present application. As shown in fig. 1, the periscopic camera module according to the embodiment of the present application includes: light turning component 10, lens group 20, photosensitive component 30 and driving component 40.

As shown in fig. 1, in the embodiment of the present application, the light turning component 10 includes: a carrier 11 and a light turning element 12 mounted on the carrier 11, wherein the light turning element 12 is used for receiving imaging light from a subject and turning the imaging light to the lens group 20. That is, the lens group 20 is held on the light-turning path of the light-turning assembly 10, as shown in fig. 2. In particular, in the embodiment of the present application, the light turning element 12 is configured to turn the imaging light from the object by 90 °, so that the overall height dimension of the periscopic camera module can be reduced. Here, in consideration of manufacturing tolerance, in an actual operation, an error of within 1 ° may exist in the angle at which the light bending element 12 bends the imaging light, as will be understood by those skilled in the art.

In a specific example of the present application, the light-turning element 12 may be implemented as a mirror (e.g., a plane mirror), or a light-turning prism (e.g., a triangular prism). For example, when the light turning element 12 is implemented as a light turning prism, the light incident surface and the light exiting surface of the light turning prism are perpendicular to each other and the light reflecting surface of the light turning prism is inclined at an angle of 45 ° to the light incident surface and the light exiting surface, so that when the imaging light enters the light turning prism perpendicularly to the light incident surface, the imaging light can be turned by 90 ° at the light reflecting surface and output from the light exiting surface perpendicularly to the light exiting surface.

As shown in fig. 1, in the embodiment of the present application, the carrier 11 has a carrying surface 111, and in an implementation, the light turning element 12 may be attached on the carrying surface 111 of the carrier 11 by an adhesive. It should be understood that the inclination angle of the supporting surface 111 influences the angle of the light reflecting surface of the light turning element 12, in this embodiment, the angle of the supporting surface 111 with respect to the horizontal plane is 45 °, so that when the light turning element 12 is attached to the supporting surface 111, the light turning element 12 can turn the imaging light at the light reflecting surface thereof by only 90 °.

Further, in the embodiment of the present application, the lens group 20 corresponds to the light turning element 12, and is configured to receive the imaging light from the light turning element 12 to converge the imaging light. That is, in the embodiment of the present application, the lens group 20 is maintained on the light-turning path of the light-turning assembly 10, as shown in fig. 2.

In the embodiment of the present application, the lens assembly 20 includes at least one optical lens 21 for converging the imaging light. In some examples of the present application, the lens assembly 20 further includes a lens barrel 22 for accommodating the at least one optical lens 21. Of course, in other examples of the present application, the lens group 20 may not include the lens barrel 22, i.e., the lens group 20 is implemented as a bare lens.

It is worth mentioning that in some examples of the present application, the lens group 20 includes, along the optical axis direction set by the lens group,: the zoom portion and the focusing portion are suitable for being respectively adjusted in position relative to the fixed portion under the action of a driver, so that the adjustment of the optical performance of the periscopic camera module, including but not limited to optical focusing, optical zooming and the like, is realized.

Further, in the embodiment of the present application, the photosensitive element 30 corresponds to the lens group 20 and is configured to receive the imaging light from the lens group 20 and perform imaging, that is, in the embodiment of the present application, the photosensitive element 30 is retained on the light emitting path of the lens group 20, as shown in fig. 2.

Specifically, as shown in fig. 1, in the embodiment of the present application, the photosensitive assembly 30 includes a circuit board 31, a photosensitive chip 32 electrically connected to the circuit board 31, and a filter element 33 held on a photosensitive path of the photosensitive chip 32, where the filter element 33 is used for filtering stray light in the imaging light. In the example illustrated in fig. 1, the photosensitive assembly 30 further includes a bracket 34 disposed on the circuit board 31, wherein the filter element 33 is mounted on the bracket 34 to be held on a photosensitive path of the photosensitive chip 32.

It should be noted that, in other examples of the present application, the specific implementation manner of the filter element 33 being held on the photosensitive path of the photosensitive chip 32 is not limited in the present application, for example, the filter element 33 may be implemented as a filter film and coated on a surface of one of the optical lenses 21 of the lens set 20 to play a filtering effect, and for example, the photosensitive assembly 30 may further include a filter element support (not shown) mounted on the support 34, wherein the filter element 33 is held on the photosensitive path of the photosensitive chip 32 in a manner of being mounted on the filter element 33 support 34.

In order to limit the imaging light entering the photosensitive assembly 30, in some examples of the present application, the periscopic camera module further includes a light blocking element 50 disposed on the photosensitive path of the photosensitive assembly 30, wherein the light blocking element 50 can at least partially block the projection of the imaging light, so as to reduce the influence of stray light on the imaging quality of the periscopic camera module as much as possible.

Fig. 3 illustrates a schematic view of a specific example of a light blocking element 50 of the periscopic camera module according to an embodiment of the present application. As shown in fig. 3, in this specific example, the light blocking element 50 is installed at the light emitting surface of the light turning element 12, wherein the light blocking element 50 has a light transmitting hole 500 adapted to allow the effective portion of the imaging light to pass through and block at least part of the stray light in the imaging light. Preferably, the light hole 500 is a circular hole to match the circular effective optical area of the lens assembly 20, so as to reduce the influence of stray light on the imaging quality as much as possible.

It should be noted that, in other examples of the present application, the light blocking element 50 may be disposed at other positions of the light turning element 12, for example, a light incident surface or a light reflecting surface of the light turning element 12, which is not limited by the present application. It should also be noted that, in other examples of the present application, the light blocking element 50 may also be disposed on the photosensitive path of the photosensitive component 30 as a separate component, for example, as a separate component disposed between the light turning element 12 and the lens group 20, and further, as a separate component disposed between the lens group 20 and the photosensitive component 30, which is not limited by the present application.

Further, as shown in fig. 1, in the embodiment of the present application, the driving assembly 40 includes a driving element 41 configured to provide a linear force for driving the light turning assembly 10 to pivot, so as to implement an optical anti-shake function of the periscopic camera module through the driving element 41, thereby improving stability of shooting performance of the periscopic camera module. It should be understood that during the shooting process, the image captured by the periscopic camera module is blurred due to the unintentional shaking, and accordingly, the influence of the unintentional shaking on the imaging performance can be counteracted by rotating the light turning assembly 10 through the driving element 41, so as to ensure the stability of the imaging performance.

As described above, in the conventional periscopic camera module, the driving element mainly used is an electromagnetic Motor, such as a Voice Coil Motor (VCM), a Shape Memory Alloy Actuator (SMA), and the like. However, when the electromagnetic motor is used as a driving element in a periscopic camera module to achieve optical anti-shake, the electromagnetic motor is not good, for example, the structure is relatively complex, the driving force provided by the electromagnetic motor is relatively small, and the driving stroke is relatively small. That is, the electromagnetic motor as a driving element cannot satisfy the technical requirements of the periscopic camera module for the optical anti-shake driver.

Specifically, the technical requirements are mainly focused on three aspects: first, a relatively greater driving force; second, better driving performance (specifically including higher precision drive control and longer drive stroke); thirdly, the structure is simplified and the size is reduced, so that the spatial arrangement of the periscopic camera module is facilitated.

After research and experiment, the inventors of the present application found that the technical requirements of the periscopic camera module for the driver can be satisfied by selecting a piezoelectric actuator, that is, in the embodiment of the present application, the driving element 41 is implemented as a piezoelectric actuator 100, and the driving assembly 40 includes a piezoelectric actuator configured to provide a linear force for driving the light-turning assembly 10 to pivot.

Fig. 4A and 4B illustrate schematic views of the piezoelectric actuator of the periscopic camera module according to an embodiment of the present application. As shown in fig. 4A and 4B, the piezoelectric actuator 100 includes: the light-turning device comprises a piezoelectric driving part 110, a driven shaft 120 which is drivingly connected to the piezoelectric driving part 110, and a driving part 130 which is tightly matched with the driven shaft 120, wherein the driving part 130 is configured to drive the light-turning component 10 to move under the action of the piezoelectric driving part 110 and the driven shaft 120.

In the example illustrated in fig. 4A and 4B, 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 a polarization direction and an electric field direction, and for example, it may be made and used by using substrate polarization in a thickness direction in a single crystal or polycrystalline ceramic, a polymer, or the like. Here, the inverse piezoelectric effect means that an electric field is applied in a polarization direction of a dielectric, and the dielectric is mechanically deformed when a potential difference is generated.

More specifically, in the example illustrated in fig. 4A and 4B, 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. Also, in this example, the piezoelectric active part 110 further includes electrode layers 115 formed on the upper and lower surfaces of the first piezoelectric substrate 112, respectively, and electrode layers 115 formed on the upper and lower surfaces of the second piezoelectric substrate 113, respectively, to supply a pulse voltage to the first piezoelectric substrate 112 and the second piezoelectric substrate 113 through the electrode layers 115 and the electrode plates 111.

In this example, the electrode plate 111 may be formed of a plate-shaped member with certain elasticity, for example, a metal plate with certain elasticity. In the example illustrated in fig. 4A and 4B, the piezoelectric active part 110 further includes at least one electrically conductive site 114 electrically connected to the electrode plate 111, for example, the at least one electrically conductive site 114 may be welded to the electrode plate 111 by welding, or the at least one electrically conductive site 114 may be integrally formed with the electrode plate 111. It is worth mentioning that when the number of the electric conduction sites 114 is plural, it is preferable that the plural electric conduction sites 114 are symmetrically distributed on the outer surface of the electrode plate 111.

In this example, the first piezoelectric substrate 112 and the second piezoelectric substrate 113 are attached to a first side surface and a second side surface opposite to the first side surface of the electrode plate 111 through the electrode layer 115, respectively. For example, in this example, the first piezoelectric substrate 112 and the second piezoelectric substrate 113 may be fixed to the electrode plate 111 in a surface-to-surface engagement with each other, or the first piezoelectric substrate 112 and the second piezoelectric substrate 113 may be attached to the electrode plate 111 by conductive silver paste.

Preferably, in this example, the shapes of the first piezoelectric substrate 112 and the second piezoelectric substrate 113 are similar or identical in size to 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.

In the example illustrated in fig. 4A and 4B, the driven shaft 120 is fixed to the piezoelectric active part 110, for example, attached to the center of the piezoelectric active part 110 by an adhesive. Specifically, the driven shaft 120 may be attached to the electrode layer 115 on the outer surface of the first piezoelectric substrate 112 by an adhesive, or nestingly attached to the center hole of the electrode layer 115 on the outer surface of the first piezoelectric substrate 112 by an adhesive, or 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 the upper and lower surfaces thereof, 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 may be implemented as a carbon rod. The cross-sectional shape of the driven shaft 120 is circular or polygonal, preferably circular.

In the example shown in fig. 4A and 4B, the driving portion 130 is frictionally engaged with the driven shaft 120, so that the driving portion 130 is movably tightly fitted on the driven shaft 120. In a specific implementation, the driving part 130 may be implemented as a clamping mechanism that clamps the driven shaft 120, wherein preferably, the clamping mechanism may be a clamping mechanism with adjustable clamping force, or a clamping mechanism made of an elastic material partially or entirely.

In the example illustrated in fig. 4A and 4B, the electrode layer 115 exposed at 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, so that, when the power control part 116 repeatedly applies a pulse voltage to the electrode layer 115 and the electrode plate 111, the first piezoelectric substrate 112 and the second piezoelectric substrate 113 are deformed in one direction by the reverse piezoelectric effect and rapidly return to a flat plate shape by the elasticity of the electrode plate 111. In the above deformation process, the driven shaft 120 reciprocates in the set axial direction, and since the driving part 130 and the driven shaft 120 are in frictional engagement, when the piezoelectric driving part 110 is deformed in one direction, the driving part 130 and the driven shaft 120 move together, and when the piezoelectric driving part 110 is rapidly restored to its original shape, the driven shaft 120 also moves in the reverse direction and the driving part 130 cannot return to its original position due to the inertia effect and cannot follow the movement of the driven shaft 120, and only stays at the position. Accordingly, the position of the driving part 130 is changed during one deformation process, and accordingly, the movement can be repeated by repeatedly applying the pulse voltage, so that the driving part 130 is moved to a target position.

Figure 5A illustrates one of the schematic diagrams of another embodiment of the piezoelectric actuator according to an embodiment of the present application. Figure 5B illustrates a second schematic diagram of another embodiment of the piezoelectric actuator in accordance with embodiments of the present application. As shown in fig. 5A and 5B, in this example, the piezoelectric actuator 100 includes: the light-turning device comprises a piezoelectric driving part 110, a driven shaft 120 which is drivingly connected to the piezoelectric driving part 110, and a driving part 130 which is tightly matched with the driven shaft 120, wherein the driving part 130 is configured to drive the light-turning component 10 to move under the action of the piezoelectric driving part 110 and the driven shaft 120.

As shown in fig. 5A and 5B, in this example, the piezoelectric active part 110 includes a piezoelectric element 111A, and the piezoelectric element 111A has a laminated structure. Specifically, as shown in fig. 5A, the piezoelectric element 111A includes a plurality of piezoelectric expanders 112A and a plurality of electrodes 113A, and the plurality of piezoelectric expanders 112A and the plurality of electrodes 113A are alternately stacked. In particular, with the laminated structure as described above, the piezoelectric element 111A can obtain a relatively large amount of deformation even in the case where a small electric field is applied.

In this example, for convenience of explanation, the electrodes 113A alternately sandwiching the plurality of piezoelectric expanders 112A are defined as internal electrodes, the electrodes 113A disposed on the surface of the piezoelectric expanders 112A and located on the upper and lower surfaces of the piezoelectric element 111A are defined as upper and lower electrodes, respectively, and the electrodes 113A disposed on the surface of the piezoelectric expanders 112A and located on the side surfaces of the piezoelectric element 111A are defined as side electrodes. Accordingly, in the case of the multilayer, the electrodes 113A of the same polarity are electrically connected through the side electrodes.

As shown in fig. 5B, in this example, the driven shaft 120 has a cylindrical shape and is attached to a middle region of the upper surface of the piezoelectric element 111A by an adhesive so that the driven shaft 120 is coupled to the piezoelectric element 111A. Of course, in other examples of the present application, the shape of the driven shaft 120 may be adjusted, and is not limited to the present application.

The driven shaft 120 is made of a material containing, as a main component, any one of "carbon, a heavy metal, a carbide of a heavy metal, a boride of a heavy metal, and a nitride of a heavy metal", and the piezoelectric element 111A has a rectangular parallelepiped shape having sides along X, Y, and Z axes orthogonal to each other. In this example, the length of the piezoelectric element 111A in the X-axis direction is 1mm, the length of the piezoelectric element 111A in the Y-axis direction is 1mm, and the length (height) of the piezoelectric element 111A in the Z-axis direction is 2 mm.

It should be noted that the piezoelectric actuator 100 illustrated in fig. 5A and 5B has advantages of small volume, large thrust and high precision compared to a conventional electromagnetic actuator. Moreover, compared to the piezoelectric actuator 100 illustrated in fig. 4A and 4B, the piezoelectric active portion 110 of the piezoelectric actuator 100 illustrated in fig. 5A and 5B has a relatively smaller cross-sectional size, and is suitable for being used in a module with a compact space, but the thickness dimension thereof is relatively large, and the internal structure of the piezoelectric element 111A is relatively complex.

Accordingly, the piezoelectric actuator 100 according to the embodiment of the present application can provide a relatively high driving force. More specifically, the piezoelectric actuator 100 selected for the present application is capable of providing a driving force of 0.6N to 2N, which is sufficient to drive components having a weight greater than 100 mg.

Also, in addition to being able to provide a relatively large driving force, the piezoelectric actuator 100 has other advantages over conventional electromagnetic motor solutions and memory alloy motor solutions, including but not limited to: the size is relatively small (with slender shape), the response precision is better, the structure is relatively simpler, the driving control is relatively simpler, the product consistency is high, no electromagnetic interference exists, the stroke is relatively large, the stabilization time is short, the weight is relatively small, and the like.

Specifically, the periscopic camera module requires that the driver configured for the periscopic camera module has the characteristics of long driving stroke, good alignment precision and the like. In current voice coil motor scheme, need additionally to design guide arm or ball guide in order to guarantee the motion linearity, need simultaneously at the large-size drive magnet of camera lens lateral part adaptation/coil etc. need set up auxiliary positioning device such as ball, shell fragment, suspension wire simultaneously, for holding more parts, guarantee structural strength and reservation structure clearance, often lead to the module horizontal size to be big partially, and structural design is complicated, and module weight is heavier. The memory alloy motor scheme is limited by relatively few strokes that the memory alloy scheme can provide in the same proportion, and meanwhile, the reliability risks of potential wire breakage and the like exist.

The piezoelectric actuator 100 has a relatively simple structure, the assembly structure is simpler, and the sizes of the active elements such as the piezoelectric active part 110, the driven shaft 120 and the driving part 130 are basically independent of the size of the movement stroke, so that the piezoelectric actuator 100 can realize the advantages of large thrust, small size, small weight and the like in optical zoom products, and simultaneously, the design is performed by matching with larger stroke or heavier weight of the devices, and the integration level in the design is higher.

Further, the piezoelectric actuator 100 utilizes friction and inertia during vibration to push the object to be pushed to perform micron-scale motion in a friction contact manner, and compared with an electromagnetic scheme in which the object to be pushed is driven in a non-contact manner and gravity needs to be offset by means of electromagnetic force, the friction manner has the advantages of greater thrust, greater displacement and lower power consumption, and meanwhile, the control precision is higher, and high-precision continuous zooming can be realized. In addition, when a plurality of motor mechanisms are provided, the piezoelectric actuator 100 has no magnetic coil structure and has no magnetic interference problem. In addition, the piezoelectric actuator 100 can be self-locked by means of friction force between components, so that shaking abnormal sound of the periscopic camera module during optical zooming can be reduced.

When the piezoelectric actuator 100 is selected as the driving element 41 to drive the light turning component 10 for optical anti-shake, on one hand, the driving force provided by the piezoelectric actuator 100 is a linear acting force (here, the linear acting force indicates that the direction of the acting force is along a straight line), that is, the piezoelectric actuator 100 cannot directly drive the light turning component 10 to rotate; on the other hand, since the piezoelectric actuator 100 has a structure different from that of the electromagnetic motor, it is necessary to arrange the piezoelectric actuator 100 in the periscopic camera module by using a reasonable arrangement scheme. That is, in the embodiment of the present application, when the piezoelectric actuator 100 is selected as the driving element 41 to realize the optical anti-shake function of the periscopic imaging module, not only the problem of the conversion of the driving direction but also the problem of the spatial arrangement of the periscopic imaging module need to be solved.

Specifically, in the embodiment of the present application, in order to enable the linear force provided by the piezoelectric actuator 100 to drive the light-turning component 10 to rotate, the light-turning component 10 is selected to be pivotally mounted. Specifically, as shown in fig. 1, in the embodiment of the present application, the periscopic camera module further includes a housing 60 for enclosing the light turning component 10 therein, wherein the light turning component 10 is pivotally mounted in the housing 60. More specifically, in the embodiment of the present application, the carrier 11 includes a carrier main body 111 and a pivot shaft 112 protrudingly extending from the carrier main body 111, and the pivot shaft 112 is pivotally mounted on the housing 60 so that the light turning assembly 10 can pivot about the pivot shaft 112.

It should be noted that, in other examples of the present application, the light-turning device 10 may be pivotally installed in the housing 60 by other means, for example, in a specific example of the present application, a support seat (not shown) having a receiving groove is provided in the housing 60, and the carrier 11 is pivotally installed on the support seat in a manner that the pivot axis 112 of the carrier is installed in the receiving groove, so that the light-turning device 10 is pivotally installed in the housing 60, which is not limited by the present application.

In particular, in the example illustrated in fig. 1, the carrier body 111 has an upper corner edge, a lower corner edge and the bearing surface 111 extending obliquely between the upper corner edge and the lower corner edge, wherein the pivot axis 112 is adjacent to the upper corner edge. It should be understood that in other examples of the present application, the pivot shaft 112 may also be disposed at other positions of the carrier main body 111, for example, the pivot shaft 112 is adjacent to the lower corner edge (as shown in fig. 7A), or the pivot shaft 112 is disposed at a middle region (not shown) of the carrier main body 111. That is, in the embodiment of the present application, the position of the pivot shaft 112 is not limited to the present application.

It should also be noted that, in the present application, the shape of the pivot shaft 112 is not limited to the present application, and may be implemented as a "straight" pivot shaft 112, an "L" or "Z" pivot shaft 112, etc.

It should be understood that when the light turning component 10 is pivotally mounted in the housing 60, the linear driving force provided by the piezoelectric actuator 100 can drive the light turning component 10 to pivot around the pivot axis 112 thereof to perform optical anti-shake adjustment when acting on the light turning component 10. That is, in this way, the problem of the inversion of the driving direction is solved.

More specifically, as shown in fig. 1, in the present embodiment, the carrier body 111 has a pushing surface 113, and the driving assembly 40 further includes a pushing block 42 drivingly connected to the piezoelectric actuator 100, wherein the pushing block 42 has a contact surface 420 abutting against the pushing surface 113. Thus, when the piezoelectric actuator 100 is configured to provide a linear force to the push block 42, the contact surface 420 of the driven push block 42 acts on the push surface 113 of the carrier body 111 to drive the carrier body 111 and the light-turning element 12 to pivot about the pivot axis 112.

In particular, in the periscopic camera module as illustrated in fig. 1, the cross-sectional shape of the carrier body 111 is triangular, that is, the prism body has a triangular prism shape. It should be noted that the pushing surface 113 of the carrier body 111 forms a predetermined angle with the carrying surface 111, wherein the predetermined angle is greater than or equal to 25 degrees and less than 45 degrees. It should be understood that, when the preset angle is equal to or greater than 25 degrees and less than 45 degrees, the pushing surface 113 is inclined inward with respect to the axis set by the carrier main body 111 to form the arrangement space 100 between the pushing surface 113 and the side wall of the housing 60. Accordingly, as shown in fig. 1, in the embodiment of the present application, the piezoelectric actuator 100 and the pushing block 42 are accommodated in the arrangement space 100, so that the space in the housing 60 can be more fully utilized to reduce the overall transverse dimension of the housing 60. Here, the piezoelectric actuator 100 can be installed in the arrangement space 100 because the piezoelectric actuator 100 has a slim structure unlike an electromagnetic motor.

Further, in the periscopic camera module as illustrated in fig. 1, the driven shaft of the piezoelectric actuator 100 extends longitudinally with respect to the carrier 11, that is, the piezoelectric actuator 100 is disposed longitudinally within the arrangement space 100, wherein the piezoelectric actuator 100 is configured to provide a linear force to the pushing block 42, so that the pushing block 42 is vertically moved upward or downward. In a specific implementation, a piezoelectric active portion of the piezoelectric actuator 100 may be mounted to a bottom wall of the housing 60 by an adhesive having elasticity, so that the piezoelectric actuator 100 is longitudinally disposed within the arrangement space 100.

Fig. 6A illustrates one of the schematic diagrams of the periscopic camera module according to the present application, in which the light-turning component 10 is acted on by the piezoelectric actuator 100. Fig. 6B illustrates a second schematic diagram of the light turning component 10 of the periscopic camera module according to the embodiment of the present application being acted on by the piezoelectric actuator 100. Fig. 6C illustrates a third schematic diagram of the light turning element 10 of the periscopic camera module according to the present application being acted on by the piezoelectric actuator 100. As shown in fig. 6A, when the piezoelectric actuator 100 is not operated, the light-turning component 10 is located at the initial position. As shown in fig. 6B, when the piezoelectric actuator 100 pushes the pushing block 42 to move upward, the light turning component 10 is driven to rotate counterclockwise around the pivot shaft 112. As shown in fig. 6C, when the piezoelectric actuator 100 drives the pushing block 42 to move downward, the light-turning component 10 performs instantaneous needle rotation around the pivot shaft 112 under the action of the self-gravity of the light-turning component 10.

In particular, in some examples of the present application, when the piezoelectric actuator 100 is not operating, the contact surface 420 of the pushing block 42 abuts against the pushing surface 113 of the carrier body 111, and the pushing block 42 is facilitated to push the carrier body 111 by such a surface type arrangement, as shown in fig. 6A.

Of course, in other examples of the present application, the piezoelectric actuator 100 and the pusher block 42 can also be arranged in other ways within the housing 60. For example, in one variant embodiment of the present application, the driven shaft of the piezoelectric actuator 100 extends transversely with respect to the carrier 11, i.e., the piezoelectric actuator 100 is disposed transversely within the arrangement space 100, wherein the piezoelectric actuator 100 is configured to provide a linear force to the pushing block 42 such that the pushing block 42 is moved vertically to the left or to the right, as shown in fig. 7A to 7C. In a specific implementation, the piezoelectric active part of the piezoelectric actuator 100 may be mounted to the sidewall of the housing 60 by an adhesive having elasticity, so that the piezoelectric actuator 100 is laterally disposed within the arrangement space 100.

Fig. 7A illustrates one of the schematic diagrams of the light-turning component 10 acted on by the piezoelectric actuator 100 in a variant implementation of the periscopic camera module according to the embodiments of the present application. Fig. 7B illustrates a second schematic diagram of the light-turning component 10 being acted on by the piezoelectric actuator 100 in a variant implementation of the periscopic camera module according to the embodiment of the present application. Fig. 7C illustrates a third schematic diagram of the light-turning element 10 being acted on by the piezoelectric actuator 100 in a variant implementation of the periscopic camera module according to the present application. As shown in fig. 7A, when the piezoelectric actuator 100 is not operated, the light-turning component 10 is located at the initial position. As shown in fig. 7B, when the piezoelectric actuator 100 pushes the pushing block 42 to move to the right, the light-turning component 10 is driven to rotate counterclockwise around the pivot shaft 112. As shown in fig. 7C, when the piezoelectric actuator 100 drives the pushing block 42 to move leftward, the light-turning component 10 performs instantaneous needle rotation around the pivot shaft 112 under the action of the self-gravity of the light-turning component 10.

It should be noted that, in order to solve the problem of spatial arrangement of the piezoelectric actuator 100 and the pushing block 42 in the periscopic camera module, in other examples of the present application, the shape of the carrier body 111 may be adjusted. For example, in some examples of the present application, the carrier body 111 has a push cavity 114 recessed inward, wherein at least a portion of the push block 42 or at least a portion of the push block 42 and the piezoelectric actuator 100 are received within the push cavity 114, as shown in fig. 8. For example, in the example illustrated in fig. 8, at least a portion of the piezoelectric actuator 100 is housed in the push cavity 114, and the driven shaft of the piezoelectric actuator 100 extends laterally within the push cavity 114 (of course, in other examples of this variant implementation, the driven shaft of the piezoelectric actuator 100 may also extend longitudinally within the push cavity 114, and this is not a limitation of the present application).

It will be appreciated that by providing the push chamber 114 in the carrier body 111, the space within the housing 60 can be more fully utilized, and the overall structure can be made more compact and miniaturized when the piezoelectric actuator 100 and the push block 42 are provided in the push chamber 114.

In summary, the periscopic camera module according to the embodiment of the present application is illustrated, wherein the periscopic camera module uses the piezoelectric actuator 100 as a driver to pivot the light turning component 10 to achieve optical anti-shake, which not only can provide a sufficiently large driving force, but also can provide a driving performance with higher precision and longer stroke to meet the optical anti-shake requirement of the periscopic camera module.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims (22)

1. The utility model provides a periscopic module of making a video recording which characterized in that includes:

a housing;

a light turning assembly pivotably mounted within the housing, wherein the light turning assembly includes a carrier and a light turning element mounted to the carrier, the light turning element configured to turn imaging light rays from a subject;

a lens group held on a light turning path of the light turning component;

the photosensitive assembly is held on the light emitting path of the lens group and comprises a circuit board and a photosensitive chip electrically connected with the circuit board; and

a drive assembly, wherein the drive assembly comprises a piezoelectric actuator configured to provide a linear force to drive the light-turning assembly to pivot.

2. The periscopic camera module of claim 1, wherein the carrier includes a carrier body and a pivot shaft that extends protrudingly from the carrier body, the pivot shaft being pivotally mounted within the housing such that the light turning assembly is pivotable about the pivot shaft.

3. The periscopic camera module of claim 2, wherein said carrier body has an upper corner edge, a lower corner edge, and a bearing surface extending obliquely between said upper corner edge and said lower corner edge, said light turning element being mounted on said bearing surface.

4. The periscopic camera module of claim 3, wherein the pivot axis is adjacent to the upper corner edge.

5. The periscopic camera module of claim 3, wherein said pivot axis is adjacent to said inferior corner edge.

6. A periscopic camera module according to claim 3, wherein said pivot axis is provided in a central region of said carrier body.

7. The periscopic camera module of any one of claims 4 to 6, wherein the carrier body has a pushing surface, the driving assembly further comprising a pushing block drivingly connected to the piezoelectric actuator, the pushing block having a contact surface that abuts the pushing surface, wherein when the piezoelectric actuator is configured to provide a linear force to the pushing block, the contact surface of the pushing block that is driven acts on the pushing surface of the carrier body to drive the carrier body and the light turning element to pivot about the pivot axis.

8. The periscopic camera module of claim 7, wherein the piezoelectric actuator comprises a piezoelectric active portion, a driven shaft extending from the piezoelectric active portion, and a driving portion tightly fitting to the driven shaft, wherein the driving portion is disposed on the pushing block, and the driving portion is configured to provide a linear force to the pushing block under the action of the piezoelectric active portion and the driven shaft.

9. The periscopic camera module of claim 8, wherein the piezoelectric actuator is configured to provide a linear force to the pusher block such that the pusher block is moved laterally left or right.

10. The periscopic camera module of claim 8, wherein the piezoelectric actuator is configured to provide a linear force to the push block such that the push block is moved vertically up or down.

11. The periscopic camera module of claim 9, wherein the driven shaft of the piezoelectric actuator extends transversely relative to the carrier.

12. A periscopic camera module according to claim 10, wherein said driven shaft of said piezoelectric actuator extends longitudinally with respect to said carrier.

13. The periscopic camera module of claim 11, wherein the piezoelectric active portion of the piezoelectric actuator is mounted to a bottom wall of the housing.

14. The periscopic camera module of claim 12, wherein the piezoelectric active portion of the piezoelectric actuator is mounted to a side wall of the housing.

15. A periscopic camera module according to claim 11 or 12, wherein the contact surface of the pusher block engages the pusher surface of the carrier body when the piezoelectric actuator is not operating.

16. The periscopic camera module of claim 15, wherein the cross-sectional shape of the carrier body is triangular, and the carrier body has the pushing surface forming a predetermined angle with its carrying surface.

17. The periscopic camera module of claim 16, wherein the predetermined angle is in a range of 25 degrees or greater and less than 45 degrees.

18. The periscopic camera module of claim 15, wherein the carrier body has an inwardly recessed push cavity having the push surface.

19. The periscopic camera module of claim 18, wherein at least a portion of the piezoelectric actuator is housed within the push chamber.

20. The periscopic camera module of claim 19, wherein the driven shaft of the piezoelectric actuator extends laterally within the push chamber.

21. The periscopic camera module of claim 19, wherein the piezoelectric actuator driven shaft extends longitudinally within the push cavity.

22. The periscopic camera module of claim 1, wherein the magnitude of the linear force generated by the piezoelectric actuator is 0.6N to 2N.

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