Telescopic driving device and camera module

Abstract

The application discloses a camera module and a telescopic driving device thereof, wherein the driving device comprises a driving mechanism, a transmission mechanism and a telescopic mechanism, the transmission mechanism is connected between the driving mechanism and the telescopic mechanism; the driving mechanism comprises an annular fixed part and an M-block magnet, the annular fixed part is provided with N coils, and the M-block magnet is fixedly connected to the transmission mechanism; M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2; when the driving mechanism works, the energization state of the N coils is controlled according to a set energization time sequence and a set current direction, so that the transmission mechanism rotates and drives the telescopic mechanism to extend or retract a lens assembly of the camera module. The driving device has a more simplified structure and a lighter weight, and can further improve the miniaturization and light weight of the camera module.

Description

Technical Field

[0001] This application relates to the field of camera technology, and in particular to a telescopic drive device and a camera module. Background Technology

[0002] With the increasing demands for camera capabilities in mobile electronic devices and the growing diversity of shooting scenarios, a series of camera modules, including wide-angle, ultra-wide-angle, telephoto, and macro lenses, have been developed for mobile electronic devices, among which telephoto lenses have attracted much attention.

[0003] Taking mobile phones as an example, one current option for telephoto lenses on mobile phones is the periscope method. This method uses a prism to reflect light through a lens onto the image sensor. This camera module has a complex structure and large size, impacting space optimization within the phone. This is because the periscope camera's image sensor is vertically positioned on the phone. As the number of pixels increases, the image sensor size increases, and the required thickness of the phone increases accordingly. Therefore, due to the size limitations in the thickness direction of the phone, improvements in large-sensor, large-pixel image sensors are quite difficult.

[0004] Telephoto lenses on mobile phones can also be achieved through retractable lenses. In related technologies, retractable lenses can be driven by stepper motors to extend and retract vertically. However, because stepper motors themselves are large and heavy, and require corresponding gearboxes, retractable lenses driven by stepper motors are bulky and heavy, making them unsuitable for the further miniaturization and weight reduction requirements of mobile phones. If voice coil motors are used instead, they suffer from insufficient driving force and short stroke, failing to meet the requirements for telephoto lens extension. Summary of the Invention

[0005] This invention provides a camera module and its telescopic drive device to solve or partially solve the technical problems of large size and weight of motor-driven telephoto lenses currently used in mobile electronic devices, which cannot be further miniaturized or lightweighted.

[0006] To address the aforementioned technical problems, in a first aspect, the present invention provides a telescopic driving device applied to a camera module; the driving device includes: a driving mechanism, a transmission mechanism, and a telescopic mechanism, wherein the transmission mechanism is connected between the driving mechanism and the telescopic mechanism;

[0007] The driving mechanism includes an annular fixing part and M magnets. The annular fixing part is provided with N coils, and the M magnets are fixedly connected to the transmission mechanism; M ≥ 2 and are integers, N ≥ 2 and are integers;

[0008] When the drive mechanism is working, the energizing state of the N coils is controlled according to the set energizing sequence and the set current direction, so that the transmission mechanism rotates and drives the telescopic mechanism to extend or retract the lens assembly of the camera module.

[0009] In some alternative embodiments, the N coils have the same winding direction.

[0010] In some optional embodiments, the magnetization direction of the M magnets is parallel to the winding direction of the N coils, and adjacent magnets have opposite magnetization directions.

[0011] In some alternative embodiments, M and N satisfy the equation: 2M = 3N.

[0012] In some alternative embodiments, the telescopic mechanism includes:

[0013] The base sleeve is fixedly connected to the base;

[0014] Lens sleeve, used to mount the lens assembly;

[0015] An intermediate sleeve is disposed between the base sleeve and the lens sleeve; the intermediate sleeve is connected to the transmission mechanism, and the intermediate sleeve rotates and extends under the drive of the transmission mechanism.

[0016] In some optional embodiments, the intermediate sleeve includes a first sleeve and a second sleeve; the first sleeve is sleeved inside the base sleeve and fixedly connected to the transmission mechanism; the second sleeve is sleeved between the first sleeve and the lens sleeve.

[0017] In some alternative embodiments,

[0018] The inner wall of the base sleeve is provided with at least one first vertical opening groove and at least one first spiral sliding groove;

[0019] The outer side wall of the first sleeve is provided with a number of first sliders equal to the number of first spiral grooves, and one first slider is disposed in one first spiral groove; the inner side wall of the first sleeve is provided with at least one second spiral groove.

[0020] The second sleeve is provided with a second vertical opening groove equal in number to the second spiral groove; the outer wall of the second sleeve is provided with a second slider equal in number to the first vertical opening groove, and one of the second sliders is disposed in one of the first vertical opening grooves;

[0021] The outer wall of the lens sleeve is provided with a third slider equal in number to the second spiral groove; one of the third sliders passes through a second vertical opening groove and is disposed within a second spiral groove.

[0022] In some alternative embodiments, the first helical groove has the opposite helical direction to the second helical groove.

[0023] In some alternative embodiments, the transmission mechanism includes a first ring gear, a spur gear, and a second ring gear;

[0024] The M-block magnets are fixedly connected to the first ring gear;

[0025] The spur gear is disposed between the first ring gear and the second ring gear;

[0026] The second ring gear is connected to the telescopic mechanism.

[0027] In some alternative embodiments, the spacing between any two magnets on the first ring gear is equal; the spacing between any two adjacent coils on the ring fixing part is equal.

[0028] Secondly, the present invention provides a camera module, the camera module comprising:

[0029] Base;

[0030] Lens assembly;

[0031] The driving device according to any one of the foregoing technical solutions; wherein the driving mechanism is fixedly connected to the base; and the lens assembly is sleeved within the telescopic mechanism.

[0032] Thirdly, the present invention provides an electronic device, the electronic device comprising the camera module provided in the second aspect.

[0033] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0034] This invention provides a telescopic drive device for a camera module, comprising: a drive mechanism, a transmission mechanism, and a telescopic mechanism. The telescopic mechanism, under the control of the drive mechanism, drives the lens assembly of the camera module to extend and retract. The drive mechanism utilizes N coils mounted on an annular fixing portion and M magnets mounted on the transmission mechanism to achieve telescopic drive. When the drive mechanism is operating, the energizing state of the N coils is controlled by setting the energizing timing and current direction. When the coils are energized, the magnets are subjected to force, which drives the transmission mechanism connected to the magnets to rotate. The rotation of the transmission mechanism causes the telescopic mechanism to extend or retract the lens assembly. By using coils and magnets and controlling the energizing timing and current direction to achieve drive, compared to camera modules that use motors to drive lens extension and retraction, this device provides sufficient telescopic force while simplifying the structure and reducing the number of magnets and coils. Therefore, it allows for further reduction in camera size and weight. Furthermore, the configuration of the coils and the annular fixing portion simplifies the wiring of the drive device and the camera module.

[0035] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0037] In the attached diagram:

[0038] Figure 1 A front view of a drive mechanism according to an embodiment of the present invention is shown;

[0039] Figure 2 An embodiment of the present invention is shown. Figure 1 AA cross-sectional view of the drive mechanism;

[0040] Figure 3 A schematic diagram of an annular fixing part, a coil, and the coil's orientation around an axis is shown according to an embodiment of the present invention.

[0041] Figure 4 A schematic diagram of a camera module in a retracted state according to an embodiment of the present invention is shown;

[0042] Figure 5 A schematic diagram of the transmission mechanism according to an embodiment of the present invention is shown;

[0043] Figure 6 A schematic diagram of the structure of a base sleeve according to an embodiment of the present invention is shown;

[0044] Figure 7 A schematic diagram of the structure of a first sleeve according to an embodiment of the present invention is shown;

[0045] Figure 8 A schematic diagram of the structure of a second sleeve according to an embodiment of the present invention is shown;

[0046] Figure 9 A schematic diagram of the structure of a lens sleeve according to an embodiment of the present invention is shown;

[0047] Figure 10 A schematic diagram of a camera module in an extended state according to an embodiment of the present invention is shown;

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Base;

[0050] 2. Drive mechanism; 21. Annular fixing part; 22. Coil; 23. Magnet;

[0051] 3. Transmission mechanism; 31. First ring gear; 32. Spur gear; 33. Second ring gear;

[0052] 4. Telescopic mechanism; 41. Base sleeve; 411. First vertical opening groove; 412. First spiral groove; 42. First sleeve; 421. First slider; 422. Second spiral groove; 43. Second sleeve; 431. Second slider; 432. Second vertical opening groove; 44. Lens sleeve; 441. Third slider;

[0053] 5. Lens assembly. Detailed Implementation

[0054] To enable those skilled in the art to more clearly understand this application, the technical solution of this application is described in detail below with reference to the accompanying drawings and specific embodiments. Throughout this specification, unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art. In case of any conflict, this specification takes precedence. Unless otherwise specified, all devices, etc., used in this invention can be purchased commercially or prepared by existing methods.

[0055] The following detailed description of embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0056] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0057] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0058] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0059] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0060] To address the size and weight issues arising from motor-driven lens extension and retraction in telephoto lenses currently used in mobile electronic devices, this invention provides a telescopic drive device. Its overall structure includes a drive mechanism, a transmission mechanism, and a telescopic mechanism, with the transmission mechanism connected between the drive mechanism and the telescopic mechanism.

[0061] like Figures 1-2As shown, the driving mechanism includes an annular fixing part 21 and M magnets 23. The annular fixing part 21 is provided with N coils 22, and the M magnets 23 are fixedly connected to the transmission mechanism; M ≥ 2 and are integers, N ≥ 2 and are integers; when the driving mechanism is working, the energizing state of the N coils 22 is controlled according to the set energizing timing and the set current direction, so as to make the transmission mechanism rotate and drive the telescopic mechanism to extend or retract the lens assembly of the camera module.

[0062] Specifically, the annular fixing part 21 of the drive mechanism can be fixedly connected to the base or base of the camera module. N coils 22 are fixedly connected, such as by adhesive, to the annular fixing part 21 to form the fixed part of the drive mechanism. The magnets 23 of the drive mechanism can be fixedly connected to the transmission mechanism by adhesive. M magnets 23 and the magnets 23 form a movable part at the connection part of the transmission mechanism, driving the transmission mechanism to perform transmission.

[0063] The improved principle of the above-mentioned telescopic drive device is as follows: When the drive mechanism is working, the N coils 22 are energized by setting the energizing timing and current direction. After the coils 22 are energized, the magnet 23 is subjected to force, which drives the transmission mechanism connected to the magnet 23 to rotate. The rotation of the transmission mechanism causes the telescopic mechanism to extend or retract. By setting the coils 22 and the magnet 23, and controlling the energizing timing and current direction of the coils 22 to achieve drive, compared with the camera module that drives the lens to extend and retract by a motor, its structure is simpler, and fewer magnets 23 and coils 22 are used. Therefore, the size of the camera can be further reduced and the weight is lighter. The configuration of the coils 22 and the annular fixing part 21 also makes the wiring of the drive device and the camera module simpler.

[0064] Specifically, to improve the driving efficiency of the magnetic force between the coil 22 and the magnet 23, optionally, N coils 22 are evenly arranged in the circumferential direction of the annular fixing part 21, that is, the distance between any two adjacent coils 22 is equal or the arc length distance is equal. The connection part between the transmission mechanism and the M magnets 23 can be annular, and the M magnets 23 are evenly arranged in the circumferential direction on the transmission mechanism.

[0065] Optionally, the axis of the annular fixing part 21 is coaxial with the axis of the ring formed by the M magnets 23 or the distance between them does not exceed a first preset threshold. The ring formed by the coils 22 and the ring formed by the magnets 23 can have the same radius, or the difference between their radii does not exceed a second preset threshold. This allows the magnets 23 and the coils 22 to be arranged opposite each other in the vertical direction, thereby improving the driving efficiency.

[0066] The energizing sequence of coil 22 refers to the periodic time sequence in which each coil 22 is energized and de-energized. The direction of the current when coil 22 is energized determines the direction of the force on coil 22 in the magnetic field. Combined with the magnetization direction of magnet 23 (i.e., the north and south poles), the direction of the magnetic force between coil 22 and magnet 23 is determined, which in turn determines the direction of the force that drives the transmission mechanism to rotate, and thus determines whether the lens assembly extends or retracts.

[0067] For example, if N coils are arranged in a clockwise or counterclockwise direction, and coils with odd numbers are connected in series and coils with even numbers are connected in series, then one possible energizing sequence is that at the current moment, the coil with an odd number (e.g., 1, 3) is energized, and the coil with an even number (e.g., 2, 4) is de-energized; after a time interval of T / 2, the coil with an odd number is de-energized, and the coil with an even number is energized; after another time interval of T / 2, the coil with an odd number is energized, and the coil with an even number is de-energized, and so on in a cycle.

[0068] For ease of control, the N coils 22 can have the same winding direction, so that all energized coils 22 will have the same current direction. The winding direction refers to the helical winding direction of the conductor wire of the coil 22, such as a clockwise or counterclockwise winding direction. Correspondingly, the magnetization direction of the M magnets 23 is parallel to the winding axis direction of the N coils 22, and adjacent magnets 23 have opposite magnetization directions. Here, the winding axis direction refers to the helical extension direction of the coil 22 during winding. Figure 3 The diagram shows the axial direction of coil 22, which is perpendicular to the cross-section of coil 22. By making the magnetization direction of magnet 23 parallel to the axial direction of N coils 22, magnet 23 experiences a reaction force in the tangential direction along the circumference of the coils 22 after they are energized. This causes the transmission mechanism to rotate in a set direction. Combined with the energizing sequence of coils 22, the transmission mechanism always rotates in the set direction.

[0069] An alternative solution is as follows: Figure 1 , Figure 3 As shown, coil 22 is arranged such that its axial direction extends vertically. The magnetization direction of the corresponding magnet 23 is parallel to the axial direction and is also vertical. That is, the top surface of magnet 23 in the vertical direction is the south pole (or north pole), and the bottom surface is the north pole (or south pole). Furthermore, the magnetization directions of any two adjacent magnets 23 are opposite, i.e., the north and south poles are opposite. For example, when the coil to be energized is located in the area below between two adjacent magnets, after the coil is energized, since the current directions at both ends of the coil are opposite, and the magnetic field directions at both ends are opposite, the magnetic forces acting on both ends of the coil are in the same direction, and the reaction forces fed back to the magnets are also in the same direction, thereby causing the drive mechanism to rotate in the set direction.

[0070] Another option is to arrange the coil 22 so that its axis is along the circumference of the annular fixing part 21. In this case, the magnetization direction of the magnet 23 is also along the circumference, and the magnetization directions of two adjacent magnets 23 are opposite. Its rotation principle is similar to the above option and will not be described again.

[0071] Optionally, the ratio of coil 22 to magnet 23 can be 2:3. A combination of coil 22 and magnet 23 with this ratio will have a better driving effect.

[0072] Optionally, any two magnets 23 may be evenly spaced at the connection point of the transmission mechanism, i.e., with equal intervals. The magnets 23 may be permanent magnets, such as neodymium iron boron permanent magnets, which have high magnetic field strength and can improve control sensitivity.

[0073] In some optional embodiments, the connection between the transmission mechanism and the magnet 23 is annular, and the transmission method can be gear transmission, belt transmission, chain transmission, etc., to transmit kinetic energy to the telescopic mechanism connected to the transmission mechanism.

[0074] The telescopic mechanism can adopt a sleeve telescopic structure or a bracket telescopic structure. Taking the sleeve telescopic structure as an example, such as... Figures 4 to 10 As shown, it should include at least two sleeves. The first sleeve is connected to the transmission mechanism 3, and the second sleeve is driven by the transmission mechanism 3 to extend and retract. The second sleeve is used to mount the lens assembly 5. Taking the telescopic bracket structure as an example, it can include two-stage brackets. The first-stage bracket is connected to the transmission mechanism 3, and the lens assembly 5 is mounted on the second-stage bracket. The first-stage bracket and the second-stage bracket can be connected by a connecting arm. The first-stage bracket extends and retracts to the second-stage bracket through the connecting arm driven by the transmission mechanism 3, thereby realizing the extension and retraction of the lens assembly 5.

[0075] In some optional embodiments, the telescopic mechanism 4 may include: a base sleeve 41, fixedly connected to the base 1; a lens sleeve 44, for mounting the lens assembly 5; and an intermediate sleeve disposed between the base sleeve 41 and the lens sleeve 44. The intermediate sleeve is connected to the transmission mechanism 3, and the intermediate sleeve rotates and extends under the drive of the transmission mechanism 3. By providing the intermediate sleeve, two-stage telescopic movement of the lens assembly 5 can be achieved: a first-stage telescopic movement between the intermediate sleeve and the base sleeve 41, and a second-stage telescopic movement between the lens sleeve 44 and the intermediate sleeve.

[0076] To illustrate the above solution more intuitively, in an optional embodiment, the structure of the camera module specifically used in the driving device will be further explained.

[0077] Figure 4 This embodiment shows a camera module in a retracted state, including:

[0078] Base 1;

[0079] Drive mechanism 2 is fixedly connected to the base 1;

[0080] Telescopic mechanism 4;

[0081] The transmission mechanism 3 connects the drive mechanism 2 and the telescopic mechanism 4, and is located between the drive mechanism 2 and the telescopic mechanism 4;

[0082] Lens assembly 5 is connected to telescopic mechanism 4; telescopic mechanism 4, under the control of drive mechanism 2, drives lens assembly 5 to extend or retract.

[0083] The printed circuit board (not shown in the figure) of the camera module is mounted on the base 1; a photosensitive element is electrically connected to the printed circuit board.

[0084] In this embodiment, the drive mechanism 2 uses a configuration of 4 coils 22 and 6 magnets 23. The transmission mechanism 3 uses a gear transmission scheme. Figure 5 As shown, the transmission mechanism 3 includes: a first ring gear 31, a spur gear 32, and a second ring gear 33; the six magnets 23 are fixedly connected to the first ring gear 31; the spur gear 32 is disposed between the first ring gear 31 and the second ring gear 33; the second ring gear 33 is connected to the telescopic mechanism 4.

[0085] When coil 22 is energized, magnet 23 is driven by force to rotate the first ring gear 31; through the meshing action of spur gear 32, the rotation of the first ring gear 31 drives the rotation of spur gear 32, which in turn drives the rotation of the second ring gear 33; the second ring gear 33 drives the telescopic mechanism 4 to extend and retract. To ensure transmission accuracy and provide sufficient force, two or more spur gears 32 can be provided, and the rotation shaft of the spur gear 32 can be connected between the base 1 and the base sleeve 41.

[0086] In this embodiment, any two magnets 23 are spaced at equal distances on the first ring gear 31, meaning that all magnets 23 are evenly distributed in the circumferential direction of the first ring gear 31; any two adjacent coils 22 are spaced at equal distances on the ring fixing part 21, meaning that all magnets 23 are evenly distributed on the ring fixing part 21.

[0087] In this embodiment, the drive mechanism 2 adopts the following... Figures 1-2The arrangement of coils 22 and magnets 23 shown involves four coils 22 evenly distributed around the circumference of the annular fixing part 21, which are numbered C1, C2, C3, and C4 for ease of description. C1 and C3 are connected in series, and C2 and C4 are connected in series. All coils 22 have the same winding direction, and the winding direction of all coils 22 is vertical. Six magnets 23 are evenly distributed around the circumference of the first ring gear 31, numbered M1, M2, M3, M4, M5, and M6. The magnetization direction of all magnets 23 is also vertical, meaning the line connecting the N and S poles of the magnet 23 is vertical and perpendicular to the plane of the first ring gear 31. The magnetization directions of adjacent magnets 23 are opposite, i.e., opposite polarities. For example, if the N pole of magnet M1 is on top and the S pole is on the bottom, then the N poles of magnets M2 and M6 are on the bottom and the S poles are on top.

[0088] When the telescopic mechanism 4 is in the retracted state, according to the set energizing sequence, clockwise current is applied to coils C1 and C3 at the current moment, while no current is applied to C2 and C4. Since the current directions at both ends of coil C1 are opposite, and the magnetic field directions at both ends of coil C1 are also opposite (because the magnetization directions of adjacent magnets 23 are opposite), the magnetic forces acting on both ends of coil C1 are in the same direction, both counterclockwise. The same applies to coil C3. Since coil 22 is a fixed part and magnet 23 is a movable part, under the drive of the clockwise reaction force, magnet 23 and the first ring gear 31 rotate clockwise. During rotation, the magnetic fields at both ends of coils C1 and C3 gradually change from opposite to the same, and the force disappears. Meanwhile, the magnetic field directions at both ends of coils C2 and C4 gradually change from the same to opposite. According to the set power-on sequence, the current in coils C1 and C3 is disconnected, and clockwise current is supplied to C2 and C4, so that magnet 23 continues to be subjected to a clockwise reaction force, which continues to drive the first ring gear 31 to move in a clockwise direction, thereby driving the telescopic mechanism 4 to extend the lens assembly 5.

[0089] To retract the telescopic mechanism 4, simply control the current direction of the energized coil 22 to be opposite to that when it is extended, while keeping the energizing sequence unchanged, so that the first ring gear 31 can rotate counterclockwise.

[0090] like Figures 6 to 10 As shown, the telescopic mechanism 4 in this embodiment is a sleeve telescopic mechanism, including: a base sleeve 41, an intermediate sleeve, and a lens sleeve 44; wherein the intermediate sleeve further includes: a first sleeve 42 and a second sleeve 43; the first sleeve 42 is sleeved inside the base sleeve 41 and is fixedly connected to the second ring gear 33; the second sleeve 43 is sleeved between the first sleeve 42 and the lens sleeve 44.

[0091] To achieve the extension, retraction, and limiting of the sleeve, grooves and sliders are provided on the sleeve to achieve at least two levels of extension and retraction, as detailed below:

[0092] The inner wall of the base sleeve 41 is provided with at least one first vertical opening groove 411 and at least one first spiral groove 412. The outer wall of the first sleeve 42 is provided with a number of first sliders 421 equal to the number of first spiral grooves 412, and one of the first sliders 421 is disposed within one of the first spiral grooves 412. The inner wall of the first sleeve 42 is provided with at least one second spiral groove 422. The second sleeve 43 is provided with a number of second vertical opening grooves 432 equal to the number of second spiral grooves 422; the outer wall of the second sleeve 43 is provided with a number of second sliders 431 equal to the number of first vertical opening grooves 411, and one of the second sliders 431 is disposed within one of the first vertical opening grooves 411, located below the second ring gear 33. The outer wall of the lens sleeve 44 is provided with a number of third sliders 441 equal to the number of second spiral grooves 422; one of the third sliders 441 passes through one of the second vertical opening grooves 432 and is disposed within one of the second spiral grooves 422.

[0093] The above-mentioned sleeve mechanism will now be explained in conjunction with a specific implementation structure:

[0094] Figure 6 An optional base sleeve 41 structure is shown, wherein the inner sidewall is provided with three first spiral grooves 412 and the sidewall is provided with a first vertical opening groove 411; the base sleeve 41 is the first layer sleeve and is fixedly connected to the base 1. Specifically, the spiral grooves are spirally rising grooves, and the first vertical opening groove 411 is a strip-shaped opening groove that penetrates the sidewall in a vertical direction.

[0095] Figure 7 An optional first sleeve 42 structure is shown, with three second spiral grooves 422 on its inner sidewall and three first sliders 421 on its outer sidewall, each first slider 421 being adapted to one first spiral groove 412; the first sleeve 42 serves as a second sleeve and is fixedly connected to the second ring gear 33; wherein, the second spiral grooves 422 have opposite spiral directions to the first spiral grooves 412, the first spiral grooves 412 spiraling downward in the clockwise direction, while the second spiral grooves 422 spiraling upward in the clockwise direction.

[0096] Figure 8An optional second sleeve 43 structure is shown, which has three second vertical opening slots 432 on its sidewall, the second vertical opening slots 432 penetrating the sidewall of the second sleeve 43. The second sleeve 43 serves as a third layer sleeve, and its outer sidewall has a second slider 431, which slides within the first vertical opening slot 411 of the first layer sleeve: the base sleeve 41. The assembled second slider 431 is located below the second ring gear 33 and does not affect the rotation and upward movement of the second ring gear 33 and the first sleeve 42.

[0097] Figure 9 An optional lens sleeve 44 structure is shown, which has three third sliders 441 on its outer side wall. Each third slider 441 is configured to slide through a second vertical opening slot 432 and within a second spiral groove 422.

[0098] Next, the complete extension process of the telescopic camera module will be described in conjunction with the drive mechanism 2, the transmission mechanism 3, and the sleeve telescopic mechanism:

[0099] Appendix Figure 4 A cross-sectional view of the camera module in its retracted state is shown. When the lens needs to extend, the controller controls the energization state of coil 22 according to the set energization sequence and current direction. When coil 22 is energized, it experiences a force under the magnetic field, while magnet 23 experiences a reaction force. This reaction force drives the first ring gear 31 connected to magnet 23 to rotate clockwise. The first ring gear 31 drives the spur gear 32 to rotate, which in turn drives the second ring gear 33 to rotate counterclockwise, thereby causing the first sleeve 42 connected to the second ring gear 33 to rotate counterclockwise. Since the first sleeve 42 and the second ring gear 33 are fixedly connected, the second ring gear 33 will rise and fall synchronously within the range defined by the spur gear 32 during the extension and retraction process.

[0100] When the first sleeve 42 rotates counterclockwise, the first slider 421 slides counterclockwise within the first spiral groove 412. Since the first spiral groove 412 spirals upward in the counterclockwise direction, the first sleeve 42 rotates and extends counterclockwise relative to the base sleeve 41. This is the first stage of rotational extension of the lens assembly 5.

[0101] Since the third slider 441 of the lens sleeve 44 is disposed within the second spiral groove 422 on the inner wall of the first sleeve 42, the lens sleeve 44 will rotate counterclockwise along with the first sleeve 42 without extension or retraction when the first sleeve 42 rotates counterclockwise, provided there are no other restrictions. The third slider 441 of the lens sleeve 44 is disposed through the second vertical opening groove 432 of the second sleeve 43. The second vertical opening groove 432 on the second sleeve 43 restricts the rotation of the lens sleeve 44 because the second slider 431 on the outer wall of the second sleeve 43 is disposed within the first vertical opening groove 411 of the base sleeve 41. Since the base sleeve 41 is fixed, the second sleeve 43 will not rotate under the restriction of the first vertical opening groove 411, thus restricting the rotation of the lens sleeve 44. Under the combined effect of the rotation of the first sleeve 42 and the restricted rotation of the second sleeve 43, the third slider 441 of the lens sleeve 44 slides clockwise spirally upward in the second spiral groove 422, and under the restriction of the second vertical opening groove 432, the lens sleeve 44 extends out relative to the vertical direction of the base sleeve 41 without rotating. This is the second stage of extension of the lens assembly 5.

[0102] During the extension of the lens sleeve 44, the second sleeve 43 is initially in a closed state relative to the base sleeve 41. As the lens sleeve 44 rises, the third slider 441 reaches the top of the second vertical opening slot 432. The continued extension of the lens sleeve 44 causes the third slider 441 to drive the second sleeve 43 to extend relative to the base sleeve 41.

[0103] The retraction control principle of lens assembly 5 is the same as the extension control principle. The only difference is that the current in the control coil 22 is reversed, causing the first ring gear 31 to rotate in the opposite direction. Therefore, the lens retraction process will not be described in detail here.

[0104] During the extension and retraction process, the height range of the first spiral groove 412 determines the extension and retraction range of the first sleeve 42, and the height range of the second spiral groove 422 determines the extension and retraction range of the lens sleeve 44. The first vertical opening groove 411 on the base sleeve 41 cooperates with the second slider 431 to limit the second sleeve 43 and prevent it from rotating. The second vertical opening groove 431 on the second sleeve 43 cooperates with the third slider 441 to limit the lens sleeve 44 and prevent it from rotating during the extension and retraction process.

[0105] It should be noted that the spiral directions of the first spiral groove 412 and the second spiral groove 422, as well as the clockwise and counterclockwise rotation directions, described above are only in conjunction with the appendix of this invention. Figures 6-10The illustrative structural design does not limit the rotation and extension method of the camera module provided by this invention. In this embodiment, the first ring gear 31 in the drive mechanism 2 rotates clockwise to extend the lens, as shown in the attached figure. Figure 10 As shown; the drive mechanism 2 rotates counterclockwise to retract the lens; of course, by configuring the magnetization direction of the magnet 23, the winding direction of the energized coil 22, or the current direction, the drive mechanism 2 can also rotate counterclockwise to extend the lens and rotate clockwise to retract the lens, which is not limited here.

[0106] The driving device and corresponding camera module provided in this embodiment have the following advantages:

[0107] 1) The drive mechanism 2 uses 4 coils 22 fixed on the annular fixing part 21 to form a fixed part, and 6 magnets 23 fixed on the first ring gear 31 to form a rotating part; with a simpler structure, smaller volume and lighter weight, it achieves a telescopic drive effect similar to stepper motors and voice coil motors, which helps to further miniaturize and lighten the telephoto telescopic lens for mobile electronic devices.

[0108] 2) The drive mechanism 2 drives the first ring gear 31 to rotate, and the second ring gear 33 drives the first sleeve 42 to rotate. The first-stage rotational extension is achieved by the first slider 421 on the outer wall of the first sleeve 42 sliding in the first spiral groove 412 on the inner wall of the base sleeve 41 (fixed sleeve). The third slider 441 on the outer wall of the lens sleeve 44 passes through the second vertical opening groove 432 on the side wall of the second sleeve 43 and slides in the second spiral groove 422 on the inner wall of the first sleeve 42. Under the limit of the second sleeve 43, the second-stage extension of the lens sleeve 44 relative to the base sleeve 41 is achieved. No rotation occurs during the extension process. On the one hand, compared with the stepper motor driving the lens assembly 5 to perform linear up-and-down telescopic movement, the above structural design enables the camera module to achieve rotational telescopic movement while reducing its size. On the other hand, by designing a telescopic structure that does not rotate the lens sleeve 44 during telescopic movement, it is possible to ensure that the lens assembly 5 does not rotate during telescopic movement. This makes it easier to lay out the lens assembly 5 and eliminates the stress and torque applied to the lens assembly 5 during the rotation of the lens sleeve 44, thereby improving the service life of the lens assembly 5.

[0109] Based on the same inventive concept as the foregoing embodiments, in another optional embodiment, an electronic device is provided, which includes the retractable camera module of the foregoing embodiments. The electronic device can be a mobile electronic device such as a mobile phone or tablet computer.

[0110] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0111] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A telescopic drive device, characterized in that, Applied to camera modules, the driving device includes: a driving mechanism, a transmission mechanism, and a telescopic mechanism, wherein the transmission mechanism is connected between the driving mechanism and the telescopic mechanism; The driving mechanism includes an annular fixing part and M magnets. The annular fixing part is provided with N coils, and the M magnets are fixedly connected to the transmission mechanism; M ≥ 2 and are integers, N ≥ 2 and are integers; The telescopic mechanism includes a base sleeve, a lens sleeve, and an intermediate sleeve, disposed between the base sleeve and the lens sleeve; the intermediate sleeve is connected to the transmission mechanism, and the intermediate sleeve rotates and extends under the drive of the transmission mechanism; the intermediate sleeve includes a first sleeve and a second sleeve; the first sleeve is sleeved inside the base sleeve and fixedly connected to the transmission mechanism; the second sleeve is sleeved between the first sleeve and the lens sleeve. The inner wall of the base sleeve is provided with at least one first vertical opening groove and at least one first spiral sliding groove; The outer side wall of the first sleeve is provided with a number of first sliders equal to the number of first spiral grooves, and one first slider is disposed in one first spiral groove; the inner side wall of the first sleeve is provided with at least one second spiral groove. The second sleeve is provided with a second vertical opening groove equal in number to the second spiral groove; the outer wall of the second sleeve is provided with a second slider equal in number to the first vertical opening groove, and one of the second sliders is disposed in one of the first vertical opening grooves; The outer wall of the lens sleeve is provided with a third slider equal in number to the second spiral groove; one of the third sliders passes through a second vertical opening groove and is disposed within a second spiral groove; When the drive mechanism is working, the energizing state of the N coils is controlled according to the set energizing sequence and the set current direction, so that the transmission mechanism rotates and drives the telescopic mechanism to extend or retract the lens assembly of the camera module.

2. The driving device as described in claim 1, characterized in that, The N coils have the same winding direction.

3. The driving device as described in claim 1, characterized in that, The magnetization direction of the M magnets is parallel to the winding direction of the N coils, and adjacent magnets have opposite magnetization directions.

4. The driving device as described in claim 1, characterized in that, The M and the N satisfy the equation: 2M = 3N.

5. The driving device as described in claim 1, characterized in that, The first spiral groove has the opposite spiral direction to the second spiral groove.

6. The driving device as claimed in claim 1, characterized in that, The transmission mechanism includes a first ring gear, a spur gear, and a second ring gear; The M-block magnets are fixedly connected to the first ring gear; The spur gear is disposed between the first ring gear and the second ring gear; The second ring gear is connected to the telescopic mechanism.

7. The driving device as claimed in claim 6, characterized in that, The distance between any two magnets on the first ring gear is equal; the distance between any two adjacent coils on the ring fixing part is equal.

8. A camera module, characterized in that, The camera module includes: Base; Lens assembly; The driving device as described in any one of claims 1 to 7; wherein the driving mechanism is fixedly connected to the base; and the lens assembly is sleeved within the telescopic mechanism.

Images