Multi-stage telescopic camera module and mobile terminal

Abstract

The present application discloses a multi-stage telescopic camera module, comprising: a circuit board; a lens holder, arranged on the circuit board; a photosensitive component, comprising a photosensitive chip and a color filter, wherein the photosensitive chip is arranged on the circuit board, and the color filter is arranged on the lens holder; a housing, arranged on the circuit board or the lens holder; a stator, arranged on the circuit board or the lens holder; a driver, arranged on the circuit board or the lens holder, and connected to the stator for driving the stator to move; a rotor, arranged in the stator, and the outer wall of the rotor is connected to the inner wall of the stator by threads; a lens barrel, arranged in the rotor, and the outer wall of the lens barrel is provided with a guide column, and the inner wall of the rotor is provided with a guide groove adapted to the guide column, and the guide column is arranged in the guide groove. The present application simplifies the internal structure of the module, reduces the cost and assembly difficulty.

Description

Technical Field

[0001] The present application relates to the technical field of camera equipment, and in particular to a multi-stage camera module and a mobile terminal. Background Art

[0002] With the popularity of mobile electronic devices, camera modules used in mobile electronic devices have also been developing and improving. Camera modules have been widely used in many fields such as medical, security, industrial production, etc. In recent years, due to the development of mobile communication technology, camera modules are increasingly widely used in portable terminals such as smart phones and tablets. With the continuous advancement of technology, and in order to meet market demand, the requirements for high pixels and high frame rates of camera modules are also getting higher and higher.

[0003] Therefore, multi-zoom shooting has become a necessary function of today's camera modules. Generally speaking, multi-zoom shooting requires at least one telephoto module to achieve it. However, as the zoom factor increases, the total focal length of the telephoto module will also increase, which causes the total height of the camera module to increase. In order to solve the height problem, periscope modules or telescopic sleeves are generally used. The periscope module is difficult to be widely used due to its high cost and difficulty in assembly. The nesting of multiple sleeves requires the simultaneous installation of multiple motors, which is costly and difficult to assemble. Therefore, there are also major disadvantages. Summary of the invention

[0004] Based on the problems of the above-mentioned background technology, the present application provides a multi-stage camera module and a mobile terminal to solve the shortcomings of the existing module such as complex structure, high cost, and difficult assembly.

[0005] In a first aspect, the present application provides a multi-stage telescopic camera module, comprising:

[0006] Circuit board;

[0007] A mirror holder, arranged on the circuit board;

[0008] A photosensitive component, comprising a photosensitive chip and a color filter, wherein the photosensitive chip is arranged on the circuit board, and the color filter is arranged on the lens holder;

[0009] A housing, arranged on the circuit board or the mirror base;

[0010] A stator, arranged on the circuit board or the mirror base;

[0011] A driver, disposed on the circuit board or the mirror base, the driver is connected to the stator and is used to drive the stator to move;

[0012] A rotor is disposed in the stator, wherein the outer wall of the rotor is connected to the inner wall of the stator via threads;

[0013] The lens barrel is arranged in the rotor, the outer wall of the lens barrel is provided with a guide column, the inner wall of the rotor is provided with a guide groove adapted to the guide column, and the guide column is arranged in the guide groove.

[0014] Optionally, the guide groove includes a first horizontal section, a second horizontal section, and an inclined section connected between the first horizontal section and the second horizontal section.

[0015] Optionally, the friction coefficient of the inner wall of the first horizontal section is less than the friction coefficient of the inner wall of the inclined section and less than the friction coefficient of the inner wall of the second horizontal section.

[0016] Optionally, a guide post installation section is provided in communication with the port of the first horizontal section, and the guide post installation section is in communication with one of the end faces of the rotor.

[0017] Optionally, the cross-section of the outer wall of the stator is a regular polygon, and the driver adopts a piezoelectric sheet, and the piezoelectric sheet is arranged on each side wall of the stator.

[0018] Optionally, the cross-section of the stator is a regular hexagon.

[0019] Optionally, the piezoelectric sheet is bonded and fixed to a side wall of the stator.

[0020] Optionally, a Hall element is further provided in the housing, and a magnet cooperating with the Hall element is provided on the rotor.

[0021] In a second aspect, the present application provides a mobile terminal, including:

[0022] main housing;

[0023] The camera module described in any one of the first aspects is arranged in the main shell.

[0024] Optionally, the height of the lens barrel protruding from the back of the main shell is 0-5mm.

[0025] The beneficial technical effects of this application are as follows:

[0026] When the camera module is not working, that is, the camera of electronic devices such as mobile phones and tablets is not enabled, the rotor and the lens barrel are retracted into the housing of the electronic device. At this time, the distance between the lens barrel and the photosensitive chip is the shortest. At this time, the height of the entire camera module is at its minimum, and the height of the lens barrel protruding from the back of the terminal device housing is the smallest.

[0027] When the camera module is running, that is, when the camera is started, the driver drives the stator to vibrate intermittently. Since the rotor and the stator are engaged through threads, under the action of the exciting force, the rotor is subjected to the friction from the contact surface of the threads, and a relative motion trend is generated between the inner surface of the stator and the outer surface of the rotor. The rotor rotates and rises along the threads. It should be understood that the friction between the threads here serves as the driving force for the rotor to move. At the microscopic level, every time the stator vibrates, the rotor rotates and rises a short distance, which is reflected in the macroscopic level as the continuous rise and fall of the rotor.

[0028] Since the movement of the rotor is driven by continuous exciting force, the overall movement of the rotor is understood as the synthesis of multiple movements. Each time the rotor moves, the guide post will move a short distance along the guide groove. It should be understood that the principle of the movement of the guide post along the guide groove is the same as the principle of the rotor rising along the thread. In the absence of external force, there is friction between the threads of the stator and the rotor, so the two are in a relatively static state. When the driver applies exciting force to the stator, the rotor overcomes the inertia force and moves along the thread, and the friction between the threads is the driving force; similarly, in the absence of external force, there is friction between the guide post and the inner wall of the guide groove, and the two are in a relatively static state. When the rotor moves, the guide post overcomes the static friction between it and the inner wall of the guide groove and moves forward. At this time, the friction of the inner wall of the guide groove is the driving force to drive the guide post forward. Therefore, it can be understood that the driving force of the guide post movement comes from the driver and the rotor. So at the microscopic level, it is the rotor that moves step by step to push the guide post forward step by step. At the macroscopic level, it is that the rotor moves along the inner wall of the stator while the lens barrel moves along the inner wall of the rotor.

[0029] Through this application, only a single driver is used to make the rotor and the lens barrel move linearly along the optical axis at the same time, that is, the purpose of a single driving element driving the two-stage assembly to extend and retract is achieved, which effectively reduces the cost, simplifies the internal structure of the module, and reduces the difficulty of assembling the module. In addition, the two-stage telescopic movement in this application is achieved by means of a threaded structure and a guide post and guide groove matching method. Compared with the traditional motor guide rod matching structure, the number of parts is reduced, the volume is reduced, a series of transmission devices are omitted, the production cost and the difficulty of assembly are reduced, and the thread matching and the guide post and guide groove matching methods are more stable and will not produce large-scale vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without exceeding the scope of protection required by the present application.

[0031] Figure 1It is a structural schematic diagram of a multi-stage camera module provided in an embodiment of the present application;

[0032] Figure 2 is another structural schematic diagram of a multi-stage camera module provided in an embodiment of the present application;

[0033] Figure 3 It is a three-dimensional exploded diagram of a multi-stage camera module provided in an embodiment of the present application;

[0034] Figure 4 It is a schematic diagram showing the stator, rotor, lens barrel and their positional relationship;

[0035] Figure 5 It is a structural schematic diagram of a guide groove.

[0036] In the figure, 11, circuit board; 12, lens holder; 13, housing; 2, photosensitive component; 21, photosensitive chip; 22, color filter; 3, stator; 4, rotor; 41, guide groove; 411, first horizontal section; 412, second horizontal section; 413, inclined section; 414, guide column mounting section; 5, driver; 6, lens barrel; 61, guide column; 71, Hall element; 72, magnet. DETAILED DESCRIPTION

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0041] The following is a clear and complete description of the technical solution of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0042] As people's requirements for the camera quality of mobile electronic devices become higher and higher, the height of camera modules is also getting larger and larger. However, the production design of smart phones, tablets and other devices tends to be thinner and lighter. As a result, the lens barrel in the camera module of smart phones, tablets and other devices often protrudes from the back of the device shell. This will cause the back of the device to be unable to be placed stably on the desktop during use. In addition, due to the influence of human and external environmental factors, the part of the lens barrel protruding from the back of the shell may cause bumps and wear during the use of the device, which will greatly reduce the user experience.

[0043] In order to overcome the above problems, the relevant technologies use periscope modules or telescopic modules. The periscope module changes the optical path by setting a light-converting element, which can be understood as folding the optical path. Although this can achieve the purpose of reducing the total height of the camera module, its cost is relatively high, and its structural form makes assembly difficult. In addition, the periscope module occupies a large amount of space inside the device. Under the condition of a certain device volume, the device installed with the periscope module needs to sacrifice in terms of battery, heat dissipation, etc.

[0044] In terms of structure, the telescopic sleeve module generally uses a stepper motor, voice coil motor, etc. as a driving element, and sets a guide rod and other components in the module to control the sleeve to move linearly along the optical axis of the lens. Therefore, when multi-stage telescopic movement is required, multiple sets of driving structures need to be set, which not only increases the cost, but also makes the internal structure of the module complicated and increases the difficulty of assembling the equipment. Therefore, both of the above methods have great disadvantages.

[0045] Reference Figure 1 , Figure 2 and Figure 3 , is a multi-stage telescopic camera module disclosed in an embodiment of the present application, including a circuit board 11, a lens holder 12, a housing 13, a photosensitive component 2, a stator 3, a rotor 4, a driver 5 and a lens barrel 6.

[0046] The circuit board 11 is used to connect to the control system of terminal devices such as mobile phones and tablets. It is the mounting substrate of the photosensitive component 2 and serves as a carrier for the electrical connection between the entire camera module and the terminal device. The lens holder 12 is fixedly arranged on the circuit board 11, and the diameter of the lens holder 12 is not larger than the size of the circuit board 11. According to the size of the lens holder 12, the housing 13 can be fixedly arranged on the circuit board 11 or on the lens holder 12. The housing 13 is a cylindrical structure, which serves as the outer contour of the entire camera module and protects the components inside the module.

[0047] The photosensitive component 2 includes a photosensitive chip 21 and a color filter 22, wherein the photosensitive chip 21 is fixedly arranged on the circuit board 11, and the color filter 22 is fixedly arranged on the lens holder 12, the color filter 22 is located in front of the photosensitive chip 21, and the optical axes of the color filter 22 and the photosensitive chip 21 are located on the same straight line, and the light passes through the color filter 22 and is projected onto the photosensitive chip 21.

[0048] According to the size of the mirror base 12, the stator 3 can be fixedly arranged on the circuit board 11 or on the mirror base 12. The stator 3 is a cylindrical structure located inside the housing 13, and the inner wall of the stator 3 is a curved surface with a threaded structure on the inner wall.

[0049] The rotor 4 is located inside the stator 3. The rotor 4 is also a cylindrical structure. The outer wall of the rotor 4 is provided with an external thread that matches the stator 3. The rotor 4 and the stator 3 are connected by threads. A wear-resistant coating can be applied on the threaded surface where the stator 3 and the rotor 4 match to reduce the wear of the contact surface in long-term relative motion.

[0050] The driver 5 is connected to the stator 3 and is used to drive the stator 3 to intermittently move. Since the rotor 4 and the stator 3 are engaged by threads, when the stator 3 moves, the rotor 4 is driven to spirally rise.

[0051] The lens barrel 6 is arranged in the rotor 4. A plurality of stacked lens structures are arranged in the lens barrel 6. A glass plate is sealed at the end surface of the lens barrel 6. Light enters the lens barrel 6 through the glass plate, and then passes through the lens structures in sequence and is finally projected onto the photosensitive component 2. A guide post 61 is fixedly arranged on the outer wall of the lens barrel 6. The guide post 61 is cylindrical. A guide groove 41 adapted to the guide post 61 is opened on the inner wall of the rotor 4. The guide post 61 is slidably arranged in the guide groove 41.

[0052] It should be noted that in the present application, the trajectory of the guide groove 41 is not parallel to the axis of the rotor 4, and an angle is formed between the guide groove 41 and the axis direction of the rotor 4, which is embodied in a spiral shape. There is friction between the guide post 61 and the inner wall of the guide groove 41, and the magnitude of the friction is such that when the lens barrel 6 is not subjected to external force, there is no relative movement between the guide post 61 and the guide groove 41; at the same time, the exciting force generated by the intermittent movement of the rotor 4 can push the guide post 61 to move along the guide groove 41. Optionally, two guide posts 61 are symmetrically arranged on the outer wall of the lens barrel 6, and correspondingly, two guide grooves 41 are also opened on the inner wall of the rotor 4, so that two points of force are provided and symmetrically distributed on the lens barrel 6 to ensure that the lens barrel 6 is balanced by force.

[0053] When the camera module is in a non-working state, that is, when the camera of an electronic device such as a mobile phone or tablet is not enabled, the rotor 4 and the lens barrel 6 are both retracted into the housing of the electronic device. At this time, the distance between the lens barrel 6 and the photosensitive chip 21 is the shortest. At this time, the height of the entire camera module is at a minimum, and the height of the lens barrel 6 protruding from the back of the terminal device housing is the smallest.

[0054] When the camera module is running, that is, when the camera is started, the driver 5 drives the stator 3 to vibrate intermittently. Since the rotor 4 is engaged with the stator 3 through threads, under the action of the exciting force, the rotor 4 is subjected to the friction force from the contact surface of the threads, and a relative motion trend is generated between the inner surface of the stator 3 and the outer surface of the rotor 4. The rotor 4 rotates and rises along the threads. It should be understood that the friction force between the threads here serves as the driving force for the movement of the rotor 4. At the microscopic level, each time the stator 3 vibrates, the rotor 4 rotates and rises a short distance, which is reflected in the continuous rise and fall of the rotor 4 at the macroscopic level.

[0055] Since the movement of the rotor 4 is driven by continuous exciting force, the overall movement of the rotor 4 is understood as the synthesis of multiple movements. Each time the rotor 4 moves, the guide post 61 will move a short distance along the guide groove 41. It should be understood that the principle of the movement of the guide post 61 along the guide groove 41 is the same as the principle of the rotor 4 rising along the thread. In the absence of external force, there is friction between the threads of the stator 3 and the rotor 4, so the two are in a relatively static state. When the driver 5 applies exciting force to the stator 3, the rotor 4 overcomes the inertia force and moves along the thread, and the friction between the threads is the driving force; similarly, in the absence of external force, there is friction between the guide post 61 and the inner wall of the guide groove 41, and the two are in a relatively static state. When the rotor 4 moves, the guide post 61 overcomes the static friction between it and the inner wall of the guide groove 41 and moves forward. At this time, the friction of the inner wall of the guide groove 41 is the driving force for driving the guide post 61 forward. Therefore, it can be understood that the driving force for the movement of the guide column 61 comes from the driver 5 and the rotor 4. So at the microscopic level, the rotor 4 moves step by step to push the guide column 61 forward step by step. At the macroscopic level, while the rotor 4 moves spirally along the inner wall of the stator 3, the lens barrel 6 moves spirally along the inner wall of the rotor 4.

[0056] Through the present application, only a single driver 5 is used to make the rotor 4 and the lens barrel 6 move linearly along the optical axis at the same time, thereby achieving the purpose of a single driving element driving the extension and retraction of the two-stage components, effectively reducing costs, simplifying the internal structure of the module, and reducing the difficulty of assembling the module.

[0057] Reference Figure 3 and Figure 4 As an optional technical solution of the embodiment of the present application, the cross section of the side wall of the stator 3 is set to be a regular polygon. Specifically, the number of sides of the regular polygon is preferably an even number. The driver 5 uses a piezoelectric sheet, which is a rectangular thin sheet. One piezoelectric sheet is fixedly provided on each side wall of the stator 3. The polarization direction of the piezoelectric sheet is the thickness direction thereof. The piezoelectric sheet is electrically connected to the circuit board 11.

[0058] When piezoelectric sheets are used for driving, the specific principle is as follows: first, the circuit board 11 transmits the AC signal to the piezoelectric sheets, and the piezoelectric sheets will vibrate back and forth along the radial direction of the stator 3, thereby applying an exciting force to the outer wall of the stator 3; all the piezoelectric sheets on the side walls of the stator 3 are divided into two groups, and the piezoelectric sheets that alternate with each other are one group. In the same time period, the voltage signals on the piezoelectric sheets of different groups are opposite. Therefore, when the voltage signal is applied, one group of piezoelectric sheets will extend along the radial direction of the stator 3, and the other group of piezoelectric sheets will contract along the radial direction of the stator 3. When the extension or contraction of the piezoelectric sheets reaches the maximum value, the voltage direction changes, and the two groups of piezoelectric sheets move in opposite directions. Therefore, the above-mentioned actions are repeated, and the expansion and contraction direction of the piezoelectric film is changed by continuously changing the direction of the voltage. The piezoelectric film intermittently expands and contracts to drive the inner wall of the stator 3 to move. Each piezoelectric film excites a standing wave. The standing waves excited by all piezoelectric films are superimposed to form an elliptical traveling wave that propagates in the circumferential direction of the stator 3. A relative motion trend is generated between the inner surface of the stator 3 and the outer surface of the rotor 4. The rotor 4 is subjected to the friction force from the thread contact surface. The friction force serves as a driving force to drive the rotor 4 to rise and fall along the thread spiral.

[0059] In the above driving process, from a microscopic point of view, it is the intermittent exciting force generated by the deformation of the piezoelectric piece that drives the stator 3 to move. Under the action of the friction between the stator 3 and the inner wall of the rotor 4, the rotor 4 completes an action every time it vibrates. Therefore, it is manifested as the spiral lifting and lowering motion of the rotor 4 on a macroscopic level, and in the direction of the optical axis, the spiral lifting and lowering is manifested as the linear motion of the rotor 4 along the optical axis.

[0060] Each time the voltage direction changes, the rotor 4 rotates and rises once. When the piezoelectric sheet reaches the maximum deformation, the rotor 4 rotates instantly, and the guide pillar 61 overcomes the friction force and generates relative movement with the guide groove 41, thereby pushing the guide pillar 61 to rotate forward once; in the process of changing the voltage direction again, the deformation of the piezoelectric sheet decreases, the force on the rotor 4 decreases, and the guide pillar 61 is self-locked in the guide groove 41. When the piezoelectric sheet reaches the maximum deformation again, the rotor 4 and the guide pillar 61 spiral forward again. Therefore, through the reciprocating vibration of the piezoelectric sheet, the rotor 4 and the lens barrel 6 can be extended and retracted at the same time.

[0061] It should be understood that in the present application, a multi-phase power supply is used. When the number of piezoelectric sheets is 4, it is a two-phase power supply; when the number is 6, it is a three-phase power supply; and when the number is 8, it is a four-phase power supply.

[0062] When a voltage signal is applied, by changing the duration of the high level or low level in each pulse signal, the distance that the rotor 4 and the guide pillar 61 move each time, that is, the step size of the rotation of the rotor 4 and the guide pillar 61, can be changed, thereby controlling the stability of the movement process of the rotor 4 and the guide pillar 61.

[0063] It should be noted that in this application, the self-locking or movement between the stator 3 and the rotor 4, and the self-locking or movement between the guide post 61 and the rotor 4 are all caused by the friction of the contact surface. Therefore, it is theoretically feasible to drive the multi-stage components to extend and retract by a single driving element, but the excitation force generated by the piezoelectric film is attenuated during the transmission process, so it is necessary to ensure that the force can drive the next stage component to move when it is transmitted to the next stage. For the piezoelectric film used as the power source in this application, it is sufficient to make the guide post 61 move along the guide groove 41.

[0064] In the present application, the two-stage telescopic movement is achieved by means of a threaded structure and the cooperation of the guide column 61 and the guide groove 41. Compared with the traditional motor guide rod cooperation and other structures, the number of parts is reduced, the volume is reduced, a series of transmission devices are eliminated, the production cost and the difficulty of assembly are reduced, and the threaded cooperation and the cooperation of the guide column 61 and the guide groove 41 are more stable and will not produce large vibrations.

[0065] Optionally, the piezoelectric sheet and the side wall of the stator 3 are fixed by bonding in the embodiment of the present application, which simplifies the assembly process and simplifies the structure. It should be noted that when the voltage signal is connected, the outer surface of the piezoelectric sheet is the positive electrode and the inner surface is the negative electrode.

[0066] Reference Figure 4 As an optional technical solution of the embodiment of the present application, the cross-section of the side wall of the stator 3 is set to a regular hexagon. Correspondingly, the stator 3 has a total of six side walls, and the piezoelectric sheets are pasted on the side walls of the stator 3 one by one.

[0067] Since the number of piezoelectric sheets is six, a three-phase power supply should be used at this time. The three-phase ends of the three-phase power supply are connected to the positive pole of each group of piezoelectric sheets in sequence, and the neutral line end is connected to the negative pole of each piezoelectric sheet. It should be understood that if the rotor 4 is a metal conductive material, the piezoelectric sheet is estimated to be directly short-circuited with the rotor 4, that is, the neutral line end can be directly connected to the rotor 4. The cross-section of the side wall of the stator 3 is set to a regular hexagon, and its appearance is similar to a nut structure. Under the premise of being able to realize the driving function, it is less difficult to manufacture and process than regular octagons, regular decagons and other structures; and the use of a regular quadrilateral, due to the fewer points of force application, the torque generated is smaller. Taking all factors into consideration, the regular hexagon is used in this application.

[0068] Reference Figure 1As an optional technical solution of the embodiment of the present application, the diameter of the mirror base 12 is equal to the diameter of the circuit board 11, and the housing 13, the stator 3 and the piezoelectric sheet are all connected to the mirror base 12. It should be noted that a space for the piezoelectric sheet to expand and contract is reserved between the stator 3 and the housing 13, and at this time, a gap is reserved between the mirror base 12 and the lens barrel 6, and the piezoelectric sheet can be connected to the circuit board 11 through a wire. Specifically, a conductive terminal is provided on the outer surface of the piezoelectric sheet, and the wire is connected between the conductive terminal and the circuit board. The wires are gathered from the piezoelectric sheet to the circuit board 11, thereby reducing the avoidance space caused by the dispersion of the wires and improving the compactness of the overall structure.

[0069] Reference Figure 2 In another possible implementation of the present application, the housing 13, the stator 3 and the piezoelectric sheet can be directly connected to the circuit board 11. In this case, the diameter of the housing 13 is equal to the diameter of the circuit board 11, the diameter of the mirror seat 12 is smaller than the diameter of the circuit board 11, and the mirror seat 12 is located on the inner side of the rotor 4. Similarly, a space for the piezoelectric sheet to expand and contract should be reserved between the side wall of the stator 3 and the housing 13. In this case, the piezoelectric sheet can be directly connected to the circuit board 11 without the need to set a wire, thereby eliminating the avoidance space caused by the setting of the wire, making the structure more compact.

[0070] At the same time, when the above method is adopted, since the outer shell 13, piezoelectric sheet and stator 3 are all arranged on the outside of the lens holder 12, the size of the lens barrel 6 and the internal lens group is larger than the size of the photosensitive chip 21, which is beneficial to the structural design of the large aperture module under the condition of the same volume.

[0071] Reference Figure 5 As an optional technical solution of the embodiment of the present application, the guide groove 41 includes a first horizontal section 411, a second horizontal section 412 and an inclined section 413, wherein the inclined section 413 is connected and arranged between the first horizontal section 411 and the second horizontal section 412. It should be understood that the figure shows a schematic diagram of the inner wall of the rotor 4 when it is unfolded into a plane state, the first horizontal section 411 and the second horizontal section 412 are both perpendicular to the optical axis, the inclined section 413 is in a spiral state in the volume space, and is in an inclined straight section in the unfolded state. There is a smooth transition between the first horizontal section 411, the second horizontal section 412 and the inclined section 413, and it should be noted that the first horizontal section 411 is located at the end close to the photosensitive chip 21, and the second horizontal section 412 is located at the end away from the photosensitive chip.

[0072] In the initial position, the guide post 61 is located in the first horizontal section 411. At this time, the distance between the lens barrel 6 and the photosensitive chip 21 is the smallest. When the camera module is started, the friction force on the guide post 61 is perpendicular to the optical axis, that is, the horizontal direction in the figure. At this time, the guide post 61 rotates along the guide groove 41, and there is no displacement along the optical axis. Therefore, the function of the first horizontal section 411 is equivalent to a starting process, and no expansion or contraction occurs.

[0073] Under the action of the exciting force of the stator 3, the guide post 61 enters the inclined section 413. In the inclined section 413, the guide post 61 receives the support force from the inner wall of the guide groove 41 and the friction force perpendicular to the support force. The friction force drives the guide post 61 to move along the guide groove 41. In the inclined section 413, the guide post 61 has a displacement perpendicular to the optical axis direction and a displacement parallel to the optical axis direction, that is, it rotates forward. Due to the displacement along the optical axis direction, the lens barrel 6 can be pushed to the specified position to achieve telescoping.

[0074] Finally, the guide post 61 enters the second horizontal section 412, and in the second horizontal section 412, the displacement of the lens barrel 6 along the optical axis direction will not change. It should be noted that after the guide post 61 enters the second horizontal section 412, the rotor 4 continues to move to complete the focusing process, and during the focusing process, the guide post 61 rotates in the second horizontal section 412, and does not generate displacement in the optical axis direction, so the lens barrel 6 will not affect the focusing process. Therefore, the second horizontal section 412 is set up to make the extension of the lens barrel 6 only used to change the focal length, and not participate in the focusing process, so as to prevent the two-stage components from moving at the same time and affecting the focusing accuracy.

[0075] Optionally, the friction coefficient of the inner wall of the first horizontal section 411 is less than the friction coefficient of the inner wall of the inclined section 413 and less than the friction coefficient of the inner wall of the second horizontal section 412 .

[0076] In order to ensure sufficient friction between the guide post 61 and the guide groove 41, in practice, the friction can be increased by providing textures or coating on the inner wall of the guide groove 41, so as to achieve self-locking and movement of the guide post 61. In the present application, the friction coefficient of the inner wall of the first horizontal section 411 is set to the minimum to facilitate the start of the guide post 61 and enable the guide post 61 to quickly enter the moving state; and the friction coefficient of the inner wall of the second horizontal section 412 is set to the maximum to prevent the guide post 61 from continuing to move due to inertia at the end of the movement, so that the guide post 61 quickly reaches a stationary state.

[0077] Optionally, in some other embodiments of the present application, the port of the first horizontal section 411 is further connected to a guide post installation section 414. In the present application, the guide post installation section 414 is a vertical section, that is, parallel to the optical axis direction, and the guide post installation section 414 is connected to one of the end surfaces of the rotor 4. The guide post 61 can be installed into the first horizontal section 411 through the port of the guide post installation section 414. In the actual production and assembly process, the guide post installation section 414 can be blocked after the installation is completed.

[0078] Reference Figure 1 As an optional technical solution of the embodiment of the present application, a Hall element 71 is further provided in the housing 13. According to the space requirement, the Hall element 71 can be fixedly provided on the stator 3, the lens holder 12 or the housing 13, and a magnet 72 cooperating with the Hall element 71 is fixedly provided on the rotor 4. After the guide column 61 moves into the second horizontal section 412, the Hall element 71 cooperates with the magnet 72 to control the displacement of the rotor 4 to ensure the focusing accuracy.

[0079] As some optional technical solutions of the present application, the minimum height range of the entire camera module is 9-10mm, so as to control its height protruding from the back of the shell of terminal devices such as mobile phones when not enabled, ensure its lightness and thinness, and improve the aesthetics of the entire terminal device.

[0080] As some optional technical solutions of the present application, the maximum height range of the entire camera module is 28-30mm.

[0081] The present application also discloses a mobile terminal, including a main housing and a multi-stage camera module in any of the above embodiments. It should be understood that the mobile terminal described in the present application includes but is not limited to mobile phones, tablet computers, cameras, e-readers, medical devices and other electronic devices that can be used for camera functions.

[0082] The camera module is installed in the main housing, and a through hole is provided on the back of the main housing for the lens barrel 6 to pass through, and the lens barrel 6 can pass through the through hole for framing. When the camera module is not activated, the distance between the end face of the lens barrel 6 and the back of the main housing is the shortest. When the stator 3 drives the rotor 4 and the lens barrel 6 to move, the lens barrel 6 extends outward along the through hole and protrudes from the back of the main housing.

[0083] Optionally, with regard to the overall size of the mobile terminal, it should be ensured that when the camera module is not enabled, that is, when the camera module is at a minimum height, the end surface of the lens barrel 6 protrudes from the back of the main housing by a height of 0-5 mm.

[0084] Ideally, the end face of the lens barrel 6 and the back face of the main shell are in the same plane for the best effect. However, considering many factors in actual production and processing, the thickness of the main shell and the total height of the camera module should be comprehensively considered. The lens barrel 6 can protrude slightly from the back face of the main shell, but the principle is to keep the protruding height as small as possible.

[0085] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core ideas of the present application. Therefore, changes or deformations made by those skilled in the art based on the ideas of the present application, the specific implementation methods and the scope of application of the present application, all belong to the scope of protection of the present application. In summary, the contents of this specification should not be construed as limiting the present application.

Claims

1. A multi-stage telescopic camera module, characterized in that: include: Circuit board; A mirror holder, arranged on the circuit board; A photosensitive component, comprising a photosensitive chip and a color filter, wherein the photosensitive chip is arranged on the circuit board, and the color filter is arranged on the lens holder; A housing, arranged on the circuit board or the mirror base; A stator, arranged on the circuit board or the mirror base; A driver, disposed on the circuit board or the mirror base, connected to the stator and used to drive the stator to move; A rotor is disposed in the stator, wherein the outer wall of the rotor is connected to the inner wall of the stator via threads; A lens barrel is arranged in the rotor, a guide column is arranged on the outer wall of the lens barrel, a guide groove adapted to the guide column is opened on the inner wall of the rotor, the guide column is arranged in the guide groove, the guide groove includes a first horizontal section, a second horizontal section and an inclined section connected between the first horizontal section and the second horizontal section, when the guide column is located in the first horizontal section and the second horizontal section, there is no displacement along the optical axis, and the friction coefficient of the inner wall of the first horizontal section is less than the friction coefficient of the inner wall of the inclined section and less than the friction coefficient of the inner wall of the second horizontal section.

2. The multi-stage telescopic camera module according to claim 1, characterized in that: The port of the first horizontal section is connected to a guide post installation section, and the guide post installation section is connected to one of the end surfaces of the rotor.

3. The multi-stage telescopic camera module according to claim 1, characterized in that: The cross section of the outer wall of the stator is a regular polygon. The driver adopts a piezoelectric sheet, and the piezoelectric sheet is arranged on each side wall of the stator.

4. The multi-stage telescopic camera module according to claim 3, characterized in that: The cross section of the stator is a regular hexagon.

5. The multi-stage telescopic camera module according to claim 3, characterized in that: The piezoelectric sheet is bonded and fixed to the side wall of the stator.

6. The multi-stage telescopic camera module according to any one of claims 1 to 5, characterized in that: A Hall element is also arranged in the shell, and a magnet cooperating with the Hall element is arranged on the rotor.

7. A mobile terminal, characterized in that: include: main housing; The camera module described in any one of claims 1 to 6 is arranged in the main shell.

8. The mobile terminal according to claim 7, characterized in that: The height of the lens barrel protruding from the back of the main housing is 0-5mm.

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