Driving device, camera module and electronic equipment

Abstract

The invention discloses a driving device, a camera module and electronic equipment, and belongs to the technical field of camera shooting. The driving device comprises a rotor, a stator, a conducting rod and an elastic conducting piece; the stator is provided with a groove, and the conducting rod and the rotor are arranged in the groove. The elastic conductive part is arranged between the first side surface of the rotor and the first inner side wall of the groove, the elastic conductive part deforms under the condition that the rotor slides relative to the stator, and the deformation direction of the elastic conductive part is the same as the extension direction of the conductive rod; a first conductive piece is arranged on the rotor, the first end of the first conductive piece is electrically connected with the first end of the elastic conductive piece, and the second end of the first conductive piece is electrically connected with the conductive rod; the stator is provided with a second conductive piece and a third conductive piece, the first end of the second conductive piece and the first end of the third conductive piece are respectively provided with an electrifying terminal, and the second end of the second conductive piece is electrically connected with the conductive rod; the second end of the third conductive piece is electrically connected with the second end of the elastic conductive piece.

Description

Technical Field

[0001] This application belongs to the field of imaging technology, and particularly relates to a driving device, an imaging module, and an electronic device. Background Art

[0002] With the development of camera technology and the fierce competition in the market, the closed-loop focusing solution has become a standard configuration for electronic devices such as mobile phones.

[0003] In the related art, the mode adopted by the guide rod type closed-loop focusing system is the Tunnel Magnetoresistance (TMR) solution; as Figure 1 shown, the closed-loop focusing system in the guide rod type closed-loop focusing camera module includes: a TMR magnetic grating 101, a TMR element 102, and a TMR Flexible Printed Circuit (FPC) 103. Among them, the TMR magnetic grating 101 needs to be attached to the mover 104, the TMR element 102 needs to be soldered to the TMR FPC 103 by reflow soldering process, and the TMR FPC 103 needs to be adhered to the inner wall of the stator 105.

[0004] As can be seen from the above, the TMR solution in the related art is affected by the characteristics of the TMR magnetic grating 101 and the TMR element 102, which will cause magnetic interference between cameras and a large temperature drift effect, thereby reducing the imaging clarity of the imaging module. Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide a driving device, an imaging module, and an electronic device, which can solve the problem of low imaging clarity of the imaging module caused by the guide rod type closed-loop focusing system in the related art.

[0006] In a first aspect, the embodiments of this application provide a driving device, which includes: a mover, a stator, a conductive rod, and an elastic conductive member;

[0007] A groove is provided on the stator, the conductive rod and the mover are both arranged in the groove, and the mover is slidably connected to the conductive rod;

[0008] The elastic conductive member is arranged between the first side surface of the mover and the first inner side wall of the groove. When the mover slides relative to the stator, the elastic conductive member deforms, and the direction of deformation of the elastic conductive member is the same as the extending direction of the conductive rod;

[0009] A first conductive member is provided on the mover, the first end of the first conductive member is electrically connected to the first end of the elastic conductive member, and the second end of the first conductive member is electrically connected to the conductive rod;

[0010] A second conductive member and a third conductive member are provided on the stator. Power supply terminals are respectively provided at the first ends of the second conductive member and the third conductive member, and the second end of the second conductive member is electrically connected to the conductive rod; the second end of the third conductive member is electrically connected to the second end of the elastic conductive member.

[0011] In a second aspect, an embodiment of the present application provides an imaging module, which includes: a lens assembly and the driving device as described in the first aspect, and a zoom lens in the lens assembly is fixedly connected to a mover in the driving device.

[0012] In a third aspect, an embodiment of the present application provides an electronic device, which includes the driving device as described in the first aspect, or the electronic device includes the imaging module as described in the second aspect.

[0013] In the embodiment of the present application, the mover moves along the conductive rod in the groove on the stator. By connecting the region between the second end of the first conductive member and the second end of the second conductive member on the conductive rod in series in a circuit including the third conductive member, the elastic conductive member, the first conductive member, and the second conductive member, in this way, during the process of the mover sliding along the conductive rod, the length of the region between the second end of the first conductive member and the second end of the second conductive member on the conductive rod changes, so that the total resistance value of the circuit path composed of the third conductive member, the elastic conductive member, the first conductive member, the region between the second end of the first conductive member and the second end of the second conductive member on the conductive rod, and the second conductive member changes. Based on this change, the sliding distance and sliding direction of the mover along the conductive rod can be reflected, and thus the position of the mover can be determined, and closed-loop focus control can be achieved according to the position of the mover. This structure is not sensitive to temperature changes and does not introduce a magnetic structure, so it can reduce the magnetic interference between cameras and has the advantage of small temperature drift effect, and can improve the imaging clarity of the imaging module. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of a guide rod type driving device adopting a TMR scheme in the related art;

[0015] Figure 2 is a schematic structural diagram of the driving device in some embodiments of the present application;

[0016] Figure 3 is along Figure 2 a sectional view taken along the A-A direction in

[0017] Figure 4 is along Figure 3 a sectional view taken along the B-B direction in

[0018] Figure 5 is a schematic structural diagram of the mover in some embodiments of the present application;

[0019] Figure 6 is a cross-sectional view along the Figure 5 C-C direction in it;

[0020] Figure 7 is a schematic structural diagram of a stator in some embodiments of the present application;

[0021] Figure 8 is a cross-sectional view along the Figure 3 D-D direction in it;

[0022] Figure 9 is one of the assembly schematic diagrams of the first conductive member, the second conductive member, the third conductive member, the elastic conductive member and the conductive rod in the embodiments of the present application;

[0023] Figure 10 is another assembly schematic diagram of the first conductive member, the second conductive member, the third conductive member, the elastic conductive member and the conductive rod in the embodiments of the present application;

[0024] Figure 11 is the equivalent circuit schematic diagram of the first conductive member, the second conductive member, the third conductive member, the elastic conductive member and the conductive rod in the embodiments of the present application;

[0025] Figure 12 is the schematic diagram of the closed-loop focusing logic of a camera module provided by the embodiments of the present application. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0027] The terms "first", "second", etc. in the specification of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0028] To facilitate the understanding of the driving device provided by the embodiments of the present application, the following explanations are made on the technologies related to the embodiments of the present application:

[0029] As Figure 1In the shown guide-bar type driving device adopting the TMR scheme, on the one hand, it is necessary to attach the TMR magnetic grating 101, and the TMR element 102 also needs to be soldered onto the TMR FPC 103 by using the reflow soldering process, and then the TMR FPC 103 is bonded to the inner wall of the stator 105. Thus, it can be seen that the assembly process of the guide-bar type driving device in the related art is complex; on the other hand, the TMR magnetic grating 101, the TMR element 102, and the TMR FPC 103 are all deployed inside the motor housing, which requires a relatively large space inside the motor housing and is not conducive to the miniaturization development of the lens motor; on the third hand, the TMR magnetic grating 101 has magnetic radiation, and the TMR element 102 is sensitive to temperature changes, resulting in magnetic interference between cameras and a large temperature drift effect; on the fourth hand, the device costs of the TMR magnetic grating 101, the TMR element 102, and the TMR FPC 103 are relatively high, and the production costs of the surface mount technology and the reflow soldering technology adopted in the assembly process are also relatively high, resulting in a relatively high assembly cost of the guide-bar type driving device.

[0030] However, the driving device provided by the embodiment of the present application has a simple structure and a simple assembly process, occupies a small amount of space between the stator and the rotor, is conducive to the miniaturization development of the lens motor, and has a relatively low production cost; in addition, this structure is not sensitive to temperature changes and does not introduce a magnetic structure, so as to reduce the magnetic interference between cameras and have the advantage of a small temperature drift effect, and can improve the imaging clarity of the camera module.

[0031] The following will combine the accompanying drawings and specifically illustrate the driving device, camera module, and electronic device provided by the embodiment of the present application through specific embodiments and their application scenarios.

[0032] Refer to Figure 2 、 Figure 3 and Figure 4 The driving device provided by the embodiment of the present application includes: a rotor 1, a stator 2, a conductive bar 3, and an elastic conductive member 4;

[0033] A groove 21 is provided on the stator 2, the conductive bar 3 and the rotor 1 are both arranged in the groove 21, and the rotor 1 is slidably connected to the conductive bar 3;

[0034] The elastic conductive member 4 is arranged between the first side surface 11 of the rotor 1 and the first inner side wall 212 of the groove 21. When the rotor 1 slides relative to the stator 2, the elastic conductive member 4 deforms, and the deformation direction of the elastic conductive member 4 is the same as the extending direction of the conductive bar 3;

[0035] A first conductive member 12 is provided on the rotor 1. The first end of the first conductive member 12 is electrically connected to the first end of the elastic conductive member 4, and the second end of the first conductive member 12 is electrically connected to the conductive bar 3;

[0036] A second conductive member 22 and a third conductive member 23 are provided on the stator 2. Power supply terminals are provided at the first ends of the second conductive member 22 and the third conductive member 23. The second end of the second conductive member 22 is electrically connected to the conductive rod 3; the second end of the third conductive member 23 is electrically connected to the second end of the elastic conductive member 4.

[0037] In some embodiments, the driving device in the embodiments of the present application may be a driving device for driving the focusing lens or lens to move in a rail-type closed-loop focusing system. At this time, the conductive rod 3 can be reused as the sliding rail between the mover 1 and the stator 2.

[0038] In some embodiments, the conductive rod 3 may be disposed at the bottom 211 of the groove 21, and the mover 1 is pressed on the conductive rod 3.

[0039] Of course, in other embodiments, the conductive rod 3 may be disposed on the side wall of the groove 21, which is not specifically limited herein. For the convenience of description, in the embodiments of the present application, the case where the conductive rod 3 is disposed at the bottom 211 of the groove 21 is taken as an example for illustration.

[0040] In some embodiments, such as Figure 2 or Figure 3 as shown, a cover plate 25 may be provided. The cover plate 25 covers the open end of the groove 21 so that the mover 1, the conductive rod 3, and the elastic conductive member 4 are received in the receiving cavity jointly surrounded by the cover plate 25 and the stator 2. In this way, the structural integrity of the driving device can be improved.

[0041] In some embodiments, the direction in which the elastic conductive member 4 deforms is the same as the extending direction of the conductive rod 3. It may be that the spacing direction between the first side surface 11 and the first inner side wall 212 is the same as the extending direction of the conductive rod 3. As Figure 3 shown, there is a gap 10 between the first side surface 11 of the mover 1 and the first inner side wall 212 of the groove 21. The mover 1 can move along the conductive rod 3 in the groove 21 so that the width of the gap 10 is adjustable.

[0042] In some embodiments, power supply terminals are provided at the first ends of the second conductive member 22 and the third conductive member 23. The power supply terminals may be exposed on the outer surface of the stator 2. In this way, an external circuit can collect electrical signals through the power supply terminals at the first ends of the second conductive member 22 and the third conductive member 23 to judge the position of the mover 1 relative to the stator 2 according to the electrical signals.

[0043] It should be noted that the mover 1 moves along the conductive rod 3 within the groove 21 of the stator 2. By connecting the region on the conductive rod 3 between the second end of the first conductive member 12 and the second end of the second conductive member 22 in series in a circuit including the third conductive member 23, the elastic conductive member 4, the first conductive member 12, and the second conductive member 22. In this way, during the process of the mover 1 sliding along the conductive rod 3, the length of the region on the conductive rod 3 between the second end of the first conductive member 12 and the second end of the second conductive member 22 changes, causing the total resistance value of the circuit path formed by the third conductive member 23, the elastic conductive member 4, the first conductive member 12, the region on the conductive rod 3 between the second end of the first conductive member 12 and the second end of the second conductive member 22, and the second conductive member 22 to change. This resistance value is positively correlated with the length of the region on the conductive rod 3 between the second end of the first conductive member 12 and the second end of the second conductive member 22. Therefore, based on the change in the total resistance value of the circuit path, the distance and sliding direction of the mover sliding along the conductive rod can be reflected, and thus the position of the mover can be determined accordingly.

[0044] In this way, when applying the drive device in the embodiment of the present application to the closed-loop focusing scenario of a camera module, the zoom lens in the lens of the camera module can be fixedly connected to the mover 1 in the drive device, while components such as the photosensitive chip in the camera module can be relatively fixed to the stator 2 in the drive device. At this time, the axial direction of the conductive rod 3 in the drive device is the same as the optical axis direction of the camera module. In this way, during the process of the mover 1 moving along the conductive rod 3, the distance between the zoom lens and the photosensitive chip changes, thereby realizing the zoom function. At this time, by the drive device feeding back the position of the mover 1, it can be determined whether the zoom lens has accurately moved to the position corresponding to the target focal length. And when the zoom lens has not moved to the position corresponding to the target focal length, according to the actual position of the zoom lens, the lens motor is closed-loop controlled to drive the mover 1 to move until the zoom lens accurately moves to the position corresponding to the target focal length, where the target focal length is the focal length that can make the photosensitive chip form a clear image.

[0045] In some embodiments, the elastic conductive member 4 can be any conductive structure such as a spring, a spring sheet, a wire, etc. that can deform. In this way, during the process of the mover 1 moving along the conductive rod 3 within the groove 21, the width of the gap 10 changes, and the elastic conductive member 4 also deforms accordingly, so that the opposite ends of the elastic conductive member 4 are always connected to the first end of the first conductive member 12 and the second end of the third conductive member 23 provided on the opposite side walls of the gap 10.

[0046] In some embodiments, when the elastic conductive member 4 is a structure such as a spring or a spring piece that generates an elastic force upon deformation, when the mover 1 approaches the first inner sidewall 212 of the groove 21, an elastic force can be provided to the mover 1 in a direction away from the first inner sidewall 212; when the mover 1 moves away from the first inner sidewall 212 of the groove 21, an elastic force can be provided to the mover 1 in a direction towards the first inner sidewall 212. In this way, the mover 1 can be prevented from hitting the stator 2, and the problem of abnormal noise generated when the mover 1 hits the stator 2 can be solved.

[0047] In some embodiments, as Figure 3 shown, the first end of the first conductive member 12 is the upper end of the first conductive member 12, and the upper end of the first conductive member 12 extends to the first side surface 11 to achieve electrical connection with the first end of the elastic conductive member 4, and the first end of the elastic conductive member 4 is Figure 2 the left end of the elastic conductive member 4 in Figure 3 . Figure 4 . Figure 5 And Figure 6 shown, the second end of the first conductive member 12 is the lower end of the first conductive member 12, and the lower end of the first conductive member 12 extends to the bottom surface 14 of the mover 1 to achieve electrical connection with the conductive rod 3 located between the mover 1 and the bottom 211 of the groove 21.

[0048] In some embodiments, as Figure 3 , Figure 7 and Figure 8 shown, the first end of the second conductive member 22 is the end exposed outside the outer surface of the stator 2, and the second end of the second conductive member 22 penetrates the housing of the stator 2 and extends to the bottom 211 of the groove 21 to achieve electrical connection with the conductive rod 3.

[0049] In some embodiments, as Figure 3 shown, the first end of the third conductive member 23 is the end exposed outside the outer surface of the stator 2, and the second end of the third conductive member 23 penetrates the housing of the stator 2 and extends to the first inner sidewall 212 to be electrically connected to the second end of the elastic conductive member 4, and the second end of the elastic conductive member 4 is Figure 3 the right end of the elastic conductive member 4 in

[0050] In some embodiments, the first end of the elastic conductive member 4 can be electrically connected to the first end of the first conductive member 12 by using a resistance welding process; and / or, the second end of the elastic conductive member 4 can be electrically connected to the second end of the third conductive member 23 by using a resistance welding process. In this way, the assembly process of the elastic conductive member 4 can be simplified.

[0051] In some embodiments, during the working process, when the mover 1 moves along the conductive rod 3 within the groove 21 of the stator 2, the second end of the first conductive member 12 abuts against the conductive rod 3 and moves along the conductive rod 3 in a direction closer to or farther from the second end of the second conductive member 22. That is to say, the second end of the second conductive member 22 is fixedly connected to the conductive rod 3, while the second end of the first conductive member 12 is movably connected to the conductive rod 3, such that the length of the conductive rod 3 between the second end of the first conductive member 12 and the second end of the second conductive member 22 changes as the mover 1 moves.

[0052] For example: as Figure 9 and Figure 10 shown, assuming that the point where the second end of the first conductive member 12 is electrically connected to the conductive rod 3 is X, and the second end of the second conductive member 22 is electrically connected to the first part Y on the conductive rod 3. When the mover 1 moves along the conductive rod 3 towards or away from the first inner wall 212, the point X gradually approaches or moves away from the first part Y. At this time, since the region X - Y on the conductive rod 3 between the second end of the first conductive member 12 and the second end of the second conductive member 22 is connected in series in the circuit including the third conductive member 23, the elastic conductive member 4, the first conductive member 12, and the second conductive member 22. Thus, during the process of the mover 1 sliding along the conductive rod 3, the length of the region X - Y changes, causing the total resistance value of the circuit path formed by the third conductive member 23, the elastic conductive member 4, the first conductive member 12, the region X - Y, and the second conductive member 22 to change. Based on this change, the distance and sliding direction of the mover 1 sliding along the conductive rod 3 can be reflected, and thus the position of the mover 1 can be determined accordingly, and closed-loop focus control can be achieved based on the position of the mover 1.

[0053] In some embodiments, the second end of the second conductive member 22 is electrically connected to the first part Y of the conductive rod 3. During the process of the mover 1 sliding relative to the stator 2, the second end of the first conductive member 12 is located on the side of the first part Y facing away from the first inner wall 212.

[0054] In this embodiment, during the process of the mover 1 sliding relative to the stator 2, the second end of the first conductive member 12 is always located on the side of the first part Y facing away from the first inner wall 212. In this way, when the mover 1 moves along the conductive rod 3 towards the first inner wall 212, the point X gradually approaches the first part Y, causing the length of the region X - Y to gradually decrease and the resistance value of the region X - Y to also gradually decrease. When the mover 1 moves along the conductive rod 3 away from the first inner wall 212, the point X gradually moves away from the first part Y, causing the length of the region X - Y to gradually increase and the resistance value of the region X - Y to also gradually increase. The changing trend of the resistance value of X - Y can reflect the moving direction and moving distance of the mover 1.

[0055] In addition, the second conductive member 22 electrically connected to the first portion Y of the conductive rod 3 needs to be electrically connected to the third conductive member 23 and the electrical signal acquisition unit together. Based on the fact that one end of the third conductive member 23 is exposed outside the first inner wall 212, the first portion Y is arranged on the side where the second end of the first conductive member 12 faces the first inner wall 212, which can shorten the distance between the second conductive member 22 and the third conductive member 23 and facilitate the electrical connection of the second conductive member 22 and the third conductive member 23 to the same electrical signal acquisition unit.

[0056] Of course, in some other embodiments, during the sliding of the mover 1 relative to the stator 2, the second end of the first conductive member 12 can always be located on the side where the first portion Y faces the first inner wall 212.

[0057] Alternatively, during the sliding of the mover 1 relative to the stator 2, the second end of the first conductive member 12 can move from one side of the first portion Y to the other side of the first portion Y. For example: as Figure 3 shown, during the sliding of the mover 1 relative to the stator 2, the second end of the first conductive member 12 can move from the left side of the first portion Y to the right side of the first portion Y. In this embodiment, during the sliding of the mover 1 relative to the stator 2, the electrical signals on the second conductive member 22 and the third conductive member 23 can be sampled multiple times. In this way, the moving direction and moving distance of the mover 1 can be determined according to the change trend of the differential pressure change between the second conductive member 22 and the third conductive member 23.

[0058] In some embodiments, the second end of the second conductive member 22 is electrically connected to the first portion Y of the conductive rod 3 through solder paste.

[0059] In this embodiment, the second end of the second conductive member 22 is electrically connected to the first portion Y of the conductive rod 3 by using solder paste, which can simplify the assembly process of electrically connecting the second end of the second conductive member 22 to the first portion Y of the conductive rod 3.

[0060] In some embodiments, the first conductive member 12 can be attached to the surface of the mover 1.

[0061] In some other embodiments, the first conductive member 12 can be at least partially embedded in the mover 1 with both ends of the first conductive member 12 exposed.

[0062] For example: the material of the second body portion 13 of the mover 1 includes a plastic material;

[0063] The first conductive member 12 is embedded in the second body portion 13, and the first end of the first conductive member 12 is exposed outside the first side surface 11, and the second end of the first conductive member 12 is exposed outside the bottom surface 14 of the mover 1 facing the conductive rod 3.

[0064] In some embodiments, an injection molding process may be adopted to embed the first conductive member 12 in the plastic material on the second body portion 13.

[0065] In this embodiment, the structure of the mover 1 can be simplified, and the production process of the mover 1 can be simplified.

[0066] In some embodiments, two through holes may be formed in the stator 2, and the second conductive member 22 and the third conductive member 23 are passed through their respective corresponding through holes, so as to connect the signal acquisition unit outside the driving device and the electrical structure inside the driving device, such as the elastic conductive member 4 and the conductive rod 3, respectively.

[0067] In some other embodiments, the second conductive member 22 and / or the third conductive member 23 may be at least partially embedded in the stator 2, and both ends of the second conductive member 22 and the third conductive member 23 are exposed.

[0068] For example: the material of the first body portion 24 of the stator 2 includes plastic material;

[0069] The second conductive member 22 is embedded in the first body portion 24, and the first end of the second conductive member 22 is exposed on the outer surface of the stator 2, and the second end of the second conductive member 22 is exposed on the bottom 211 of the groove 21; and / or,

[0070] The third conductive member 23 is embedded in the first body portion 24, and the first end of the third conductive member 23 is exposed on the outer surface of the stator 2, and the second end of the third conductive member 23 is exposed on the first inner side wall 212.

[0071] In some embodiments, an injection molding process may be adopted to embed the second conductive member 22 and / or the third conductive member 23 in the plastic material on the first body portion 24.

[0072] In this embodiment, the structure of the stator 2 can be simplified, and the production process of the stator 2 can be simplified.

[0073] To facilitate understanding of the working principle of the driving device provided in the embodiments of the present application, taking the equivalent circuits of the first conductive member 12, the second conductive member 22, the third conductive member 23, the elastic conductive member 4 and the conductive rod 3 as shown in Figure 11 as an example, the working principle of the driving device provided in the embodiments of the present application will be illustrated by way of example.

[0074] As shown in Figure 9 , Figure 10 and Figure 11As shown in the figure, assume that the point where the second end of the first conductive member 12 is electrically connected to the conductive rod 3 is X, and the second end of the second conductive member 22 is electrically connected to the first part Y on the conductive rod 3. When the mover 1 moves along the conductive rod 3 in a direction close to or away from the first inner wall 212, the area X - Y of the first conductive member 12, the second conductive member 22, the third conductive member 23, the elastic conductive member 4, and the conductive rod 3 is regarded as a variable resistor 5. In this way, when current is input to the variable resistor 5 through the first end of the second conductive member 22 and the first end of the third conductive member 23, based on the change in the resistance value or voltage value on the variable resistor 5, the distance that the point X moves relative to the first part Y is reflected, that is, the distance that the mover 1 moves along the conductive rod 3 is reflected.

[0075] For example: Assume Figure 9 is the initial state of the mover 1 relative to the stator 2. At this time, the distance between the point X and the first part Y is d1, and d1 represents the maximum distance between the point X and the first part Y. Define the resistance value of the variable resistor 5 at this time as R;

[0076] When the mover 1 moves relative to the stator 2 to Figure 10 the point X shown in the figure, the distance between the point X and the first part Y is d2, and the displacement change △d of the mover 1 is d1 - d2. Therefore, the resulting resistance change is

[0077] The signal acquisition unit outside the driving device can obtain the voltage change amount between the first end of the second conductive member 22 and the first end of the third conductive member 23 wherein, V represents the voltage value between the first end of the second conductive member 22 and the first end of the third conductive member 23 in the initial state of the mover 1 relative to the stator 2. In this way, the resistance change amount △R can be converted into the voltage change amount △V in the circuit system. After that, the signal acquisition unit can process the voltage change amount △V and perform ADC sampling and then convert it into a digital signal for the closed-loop zoom control system to know the position change distance of the mover 1 based on this digital signal and complete the closed-loop zoom feedback control execution process accordingly.

[0078] The embodiment of the present application also provides a camera module, which includes: a lens assembly and the driving device provided in the foregoing embodiment of the present application, and the zoom lens in the lens assembly is fixedly connected to the mover 1 in the driving device.

[0079] In this embodiment, the zoom lens is fixed on the mover 1 so that the zoom lens moves in the direction of approaching or departing from the photosensitive chip following the mover 1, thereby realizing the zoom function. In addition, based on the structure of the driving device provided by the embodiments of the present application being simple and the assembly process being simple, the space occupied between the stator and the mover is small, which is conducive to the miniaturization development of the imaging module, and the production cost is low; in addition, the driving device provided by the embodiments of the present application is not sensitive to temperature changes and does not introduce a magnetic structure, so that the magnetic interference between cameras can be reduced and the advantage of small temperature drift effect can be achieved, and the imaging clarity of the imaging module can be improved.

[0080] In some embodiments, when the mover 1 slides along the conductive rod 3 in the driving device to the first position, the distance between the second end of the first conductive member 12 and the first part Y of the conductive rod 3 is greater than or equal to the maximum focusing stroke of the imaging module, wherein the first part Y of the conductive rod 3 is the part where the conductive rod 3 is electrically connected to the second conductive member 22;

[0081] The first position is the position of the mover 1 when the distance between the first side surface 11 and the first inner side wall 212 is the largest.

[0082] For example: as Figure 9 shown, when the mover 1 slides along the conductive rod 3 to the leftmost side, the distance between the first side surface 11 and the first inner side wall 212 is the maximum distance that the mover 1 can move along the conductive rod 3, that is, the maximum distance that the point X can move relative to the first part Y. By making this distance greater than or equal to the maximum focusing stroke of the imaging module, the mover 1 can drive the focusing lens to move to meet the focusing requirements of the imaging module. In addition, by making the maximum distance that the point X can move relative to the first part Y greater than or equal to the maximum focusing stroke of the imaging module, during the process that the mover 1 can drive the focusing lens to move, the change amount of the resistance value or the change amount of the voltage difference between the point X and the first part Y can reflect the distance and direction of the mover 1 moving along the conductive rod 3, so as to know the position of the focusing lens accordingly and realize the closed-loop focusing feedback accordingly.

[0083] In some embodiments, as Figure 12 shown, the imaging module further includes: a signal acquisition unit 6, a controller 7, and a driving member 8;

[0084] The first end of the signal acquisition unit 6 is electrically connected to the energized terminal of the first end of the second conductive member 22, the second end of the signal acquisition unit 6 is electrically connected to the energized terminal of the first end of the third conductive member 23, and the third end of the signal acquisition unit 6 is electrically connected to the first end of the controller 7; the second end of the controller 7 is electrically connected to the first end of the driving member 8, and the second end of the driving member 8 is connected to the mover 1;

[0085] The signal acquisition unit 6 is configured to determine the position information of the zoom lens based on the electrical signal between the first end of the second conductive member 22 and the first end of the third conductive member 23, and send the position information of the zoom lens to the controller 7;

[0086] The controller 7 is configured to implement a closed-loop focusing control function according to the position information of the zoom lens during the zooming process.

[0087] In some embodiments, the driving member 8 may be a motor. In this case, the mover 1 may also be referred to as a motor mover.

[0088] In some embodiments, the electrical signal collected by the signal acquisition unit 6 may be a voltage signal, such as the change amount of the voltage difference between the first end of the second conductive member 22 and the first end of the third conductive member 23. At this time, the signal acquisition unit 6 can determine the displacement amount of the zoom lens according to the change amount of the voltage difference between the first end of the second conductive member 22 and the first end of the third conductive member 23, and determine whether the zoom lens accurately moves to the target position indicated by the zoom command according to the displacement amount of the zoom lens, so as to realize the closed-loop feedback of the focal length.

[0089] In some embodiments, during the zooming process, the controller 7 implements the closed-loop focusing control function according to the position information of the zoom lens, which may be: after the controller 7 issues a zoom command to the driving member 8, the driving member 8 drives the mover 1 to move according to the zoom command, aiming to move the zoom lens to the target position corresponding to the focal length indicated by the zoom command. At this time, the area X-Y of the first conductive member 12, the second conductive member 22, the third conductive member 23, the elastic conductive member 4 and the conductive rod 3 can be regarded as a variable resistor. By detecting the change amount of the resistance or voltage of the variable resistor by the signal acquisition unit 6, the displacement amount and displacement direction of the mover 1 can be determined, so that the actual position offset amount of the zoom lens can be determined. In this way, after the signal acquisition unit 6 feeds back the actual position offset amount of the zoom lens to the controller 7, the controller 7 can judge whether the zoom lens actually moves to the target position according to the actual position offset amount of the zoom lens. If so, it means that the focusing is completed and shooting can be performed; if not, the displacement increment required for the zoom lens to move to the target position can be determined according to the actual position offset amount of the zoom lens, and then a control signal is sent to the driving member 8 to enable the driving member 8 to drive the mover 1 to move along the conductive rod 3 according to the control signal, driving the zoom lens to perform a position offset according to the displacement increment until the zoom lens actually moves to the target position.

[0090] In some embodiments, as Figure 12 shown, the imaging module further includes a comparator 9. The comparator 9 can compare the offset amount between the actual position of the mover 1 and the position of the mover 1 when the imaging is clear, and judge whether the zoom lens moves to the target position where clear imaging can be achieved.

[0091] For example, the shooting process of the camera module may include the following steps:

[0092] Step 1: Turn on the camera module to take a picture;

[0093] Step 2: In the camera preview mode state, based on the electrical signal output by the driving device, determine the current position of the mover 1; and determine whether the shooting scene is clear. If it is clear, perform the shooting action. If it is not clear, then perform Step 3;

[0094] Step 3: Through the focusing algorithm of the imaging system, search for and record the position of the mover 1 corresponding to when the picture is clear;

[0095] Step 4: The controller 7 drives the chip to issue a focusing instruction to the driving part 8 according to the recorded position of the mover 1 when it is clear;

[0096] Step 5: After receiving the focusing instruction, the driving part 8 gives a certain control amount to the controlled object, the mover 1, so that the mover 1 moves to the position indicated by the focusing instruction;

[0097] Step 6: The signal acquisition unit 6 feeds back the resistance change amount to the comparator 9;

[0098] Step 7: After receiving the feedback amount, the comparator 9 in the imaging system determines whether the mover 1 has moved to the position indicated by the focusing instruction; if it has reached the position indicated by the focusing instruction, perform the shooting action; if it has not reached the instruction position, then re - execute Steps 2 to 7 until the mover 1 reaches the position indicated by the focusing instruction, and then perform the shooting action.

[0099] In the camera module provided by the embodiment of the present application, since its driving device does not introduce magnetic interference, it can reduce the magnetic interference between cameras. On the one hand, it can improve the imaging clarity of the camera module. On the other hand, it can also improve the degree of freedom of layout of the camera module in the whole machine. In addition, the metal parts in the driving device can be embedded in the housings of the mover 1 and the stator 2, reuse the slide bar between the mover 1 and the stator 2 as the conductive bar 3, and arrange the elastic conductive part 4 in the motor stroke spacing between the mover 1 and the stator 2, which occupies extremely little space inside the motor and is beneficial to the miniaturization of the camera module. In addition, the structure of the driving device in the embodiment of the present application is simple, which can simplify the overall structural complexity of the camera module and reduce the production cost of the camera module. Moreover, the driving device provided by the embodiment of the present application is not sensitive to temperature changes and does not introduce a magnetic structure, so it can reduce the magnetic interference between cameras and has the advantage of small temperature drift effect, and can improve the imaging clarity of the camera module.

[0100] The embodiment of the present application further provides an electronic device, which includes the driving device provided in the foregoing embodiment of the present application; or, the electronic device includes the imaging module provided in the foregoing embodiment of the present application.

[0101] In some embodiments, the electronic device in the embodiment of the present application may be a terminal or other devices other than terminals. Exemplarily, the electronic device may be a mobile phone, a tablet computer, a laptop computer, a handheld computer, an in-vehicle electronic device, a Mobile Internet Device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a personal digital assistant (PDA), etc., and may also be a server, a Network Attached Storage (NAS), a personal computer (PC), a television (TV), a teller machine or a self-service machine, etc. The embodiments of the present application do not make specific limitations.

[0102] The electronic device provided by the embodiment of the present application has the same beneficial effects as the foregoing driving device or imaging module of the present application. To avoid repetition, it will not be elaborated here.

[0103] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitations, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0104] The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all belong to the protection scope of the present application.

Claims

1. A driving device, characterized in that: include: A mover, a stator, a conductive rod and an elastic conductive member; The stator is provided with a groove, the conductive rod and the mover are both arranged in the groove, and the mover is slidably connected to the conductive rod; The elastic conductive member is disposed between the first side surface of the mover and the first inner side wall of the groove. When the mover slides relative to the stator, the elastic conductive member is deformed, and the deformation direction of the elastic conductive member is the same as the extension direction of the conductive rod. The mover is provided with a first conductive member, a first end of the first conductive member is electrically connected to a first end of the elastic conductive member, and a second end of the first conductive member is electrically connected to the conductive rod; The stator is provided with a second conductive member and a third conductive member, the first end of the second conductive member and the first end of the third conductive member are respectively provided with power terminals, the second end of the second conductive member is electrically connected to the conductive rod; the second end of the third conductive member is electrically connected to the second end of the elastic conductive member.

2. The driving device according to claim 1, characterized in that: The second end of the second conductive member is electrically connected to the first portion of the conductive rod. When the mover slides relative to the stator, the second end of the first conductive member is located on a side of the first portion facing away from the first inner wall.

3. The driving device according to claim 1, characterized in that: The second end of the second conductive member is electrically connected to the first portion of the conductive rod through solder paste.

4. The driving device according to claim 1, characterized in that: The material of the first body portion of the stator includes plastic material; The second conductive member is embedded in the first body portion, and a first end of the second conductive member is exposed on the outer surface of the stator, and a second end of the second conductive member is exposed on the bottom of the groove; The third conductive member is embedded in the first main body, and a first end of the third conductive member is exposed on the outer surface of the stator, and a second end of the third conductive member is exposed on the first inner wall.

5. The driving device according to claim 1, characterized in that: The material of the second body portion of the mover includes plastic material; The first conductive member is embedded in the second main body, and a first end of the first conductive member is exposed on the first side surface, and a second end of the first conductive member is exposed on a bottom surface of the mover facing the conductive rod.

6. A camera module, characterized in that: The camera module comprises: a lens assembly and a driving device as described in any one of claims 1 to 5, and the zoom lens in the lens assembly is fixedly connected to the mover in the driving device.

7. The camera module according to claim 6, characterized in that: When the mover slides to the first position along the conductive rod in the driving device, the distance between the second end of the first conductive member and the first portion of the conductive rod is greater than or equal to the maximum focus stroke of the camera module, wherein the first portion of the conductive rod is a portion where the conductive rod is electrically connected to the second conductive member; The first position is the position of the mover when the distance between the first side surface and the first inner side wall is the largest.

8. The camera module according to claim 6, characterized in that: Also includes: Signal acquisition unit, controller and driver; The first end of the signal acquisition unit is electrically connected to the power-on terminal of the first end of the second conductive member, the second end of the signal acquisition unit is electrically connected to the power-on terminal of the first end of the third conductive member, and the third end of the signal acquisition unit is electrically connected to the first end of the controller; The second end of the controller is electrically connected to the first end of the driving member, and the second end of the driving member is connected to the mover; The signal acquisition unit is used to determine the position information of the zoom lens according to the electrical signal between the first end of the second conductive member and the first end of the third conductive member, and send the position information of the zoom lens to the controller; The controller is used to realize a focus control function according to the position information of the zoom lens during the zooming process.

9. The camera module according to claim 8, characterized in that: The electrical signal includes a voltage signal, and the signal acquisition unit is used to determine the displacement of the zoom lens according to the change in the voltage difference between the first end of the second conductive element and the first end of the third conductive element.

10. An electronic device, characterized in that: The electronic device includes the driving device as described in any one of claims 1 to 5; or, the electronic device includes the camera module as described in any one of claims 6 to 9.

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