Lens assembly, actuator and assembling method thereof, and camera module

Abstract

The invention discloses a lens assembly, which comprises a lens, the side wall of the lens is provided with a step part, the step surface of the step part divides the outer side surface of the lens into a first outer side surface and a second outer side surface, the first outer side surface is adjacent to the light incident end of the lens, and the second outer side surface is adjacent to the light emergent end of the lens; the variable aperture device abuts against the step face of the step part, a first protruding part is arranged at the position, close to the light emitting end of the variable aperture device, of the variable aperture device, and adhesives are filled between the end face of the light emitting end of the variable aperture device and the step face of the step part and between the inner side face of the first protruding part of the variable aperture device and the second outer side face of the variable aperture device. The invention also discloses an actuator using the lens assembly, an assembly method of the actuator, and a camera module using the actuator.

Description

Technical Field

[0001] The present invention relates to the field of optical lenses, and specifically, to a lens assembly, an actuator, an assembly method thereof, and an imaging module. Background Art

[0002] In recent years, the volume of imaging modules installed on portable devices such as smart phones and tablets has become smaller and smaller, resulting in an increase in the aperture index of the camera. However, in many traditional imaging modules, the aperture index is uniquely determined and cannot be generally changed, making it unable to adapt to different shooting scenarios, difficult to meet consumers' pursuit of high-quality photos, and affecting the user experience.

[0003] The variable aperture device of the optical lens assembly has an aperture diameter. By adjusting the area of the aperture diameter, the amount of light entering the imaging module can be adjusted, enabling the imaging module to have different brightness and depth of field. When the area of the aperture diameter is larger, the imaging module has a larger amount of light entering, resulting in a high-brightness image with a good background blurring effect. When the area of the aperture diameter is smaller, the imaging module has a smaller amount of light entering, making the details in the formed image very clear. For example, when shooting at a long focal length, a large aperture is used to increase the amount of light entering and the bokeh effect. When shooting at a short focal length, the aperture is switched to a small one to improve the resolution of the short focal length shooting.

[0004] As an important component of the imaging module, the variable aperture device of the optical lens assembly needs to be reliably connected to the lens. Since the weight of components such as the variable aperture device is relatively large (≥500 mg), much larger than the self-weight of a conventional lens, in the prior art, when the variable aperture device is bonded to the optical lens, the bottom side of the variable aperture device and the lens rely on a stepped surface for bonding, resulting in insufficient bonding area or insufficient bonding strength, and thus there is a risk of the variable aperture device falling off, with poor reliability. At the same time, if a large amount of glue is used for bonding to increase the bonding strength between the variable aperture device and the optical lens, due to the excessive amount of glue applied between the variable aperture device and the lens, the excessive glue amount will vary during the curing process and reliability tests such as high and low temperatures or high temperature and high humidity, which is also likely to cause variations in the optical performance inside the optical lens. Summary of the Invention

[0005] The purpose of the present invention is to provide a lens assembly with better reliability.

[0006] Another purpose of the present invention is to provide an actuator applying the foregoing lens assembly.

[0007] Another purpose of the present invention is to provide an assembly method of the foregoing actuator.

[0008] Another purpose of the present invention is to provide an imaging module applying the foregoing actuator.

[0009] To achieve at least one of the above purposes, the technical solution adopted by the present invention is: a lens assembly, comprising: a lens, a side wall of which is provided with a step portion, the step surface of the step portion divides the outer side surface of the lens barrel into a first outer side surface and a second outer side surface, the first outer side surface is adjacent to the light incident end of the lens, and the second outer side surface is adjacent to the light output end of the lens; a variable aperture device, supported by the step surface of the step portion, the variable aperture device is provided with a first convex portion at a position adjacent to its light output end, and adhesive is filled between the end surface of the light output end of the variable aperture device and the step surface of the step portion, and between the inner side surface of the first convex portion of the variable aperture device and the second outer side surface.

[0010] As a preference, the first convex portion extends from the light output end of the variable aperture device toward the light output end of the lens.

[0011] As a preference, the second outer side surface is recessed inwardly at a position adjacent to the step surface of the step portion to form a notch for accommodating the first convex portion.

[0012] Preferably, the first protrusion includes a first section and a second section, the first section extends from the light output end of the variable aperture device toward the light output end of the lens, and the second section extends circumferentially from the extended end of the first section, so that the first protrusion is L-shaped, and the first protrusion and the end face of the light output end of the variable aperture device jointly define a first groove, and the second outer side surface is provided with a second protrusion protruding outward, and the second protrusion is inserted into the first groove.

[0013] As a preference, in the longitudinal direction, the gap between the end face of the light emitting end of the variable aperture device and the step surface of the step portion is equal everywhere; and / or, in the transverse direction, the gap between the inner side face of the first convex portion of the variable aperture device and the second outer side face is equal everywhere.

[0014] As a preference, there are at least two convex portions, which are spaced apart in the circumferential direction; wherein the angle between two adjacent convex portions in the circumferential direction is α, and 60°≤α≤120°.

[0015] As a preferred embodiment, the variable aperture device includes a shell, an outer wall of which is provided with a first power connection point, and an inner wall of which is provided with a driving magnet and a brush wire, and the first end of the brush wire is coupled to the first power connection point; a rotating ring is arranged inside the shell, and the outer wall of the rotating ring is provided with a driving coil and a slip ring, the driving coil is opposite to the driving magnet, and the slip ring is coupled to the driving coil and conflicts with the second end of the brush wire; a blade group is transmission-connected to the rotating ring.

[0016] As a preference, there are at least two groups of the brush filaments, which are evenly spaced along the circumferential direction; each group of brush filaments has two brush filaments arranged in a V shape, and the opening of the V shape faces the rotating ring.

[0017] As a preference, on one end face of the rotating ring adjacent to the light-emitting end of the variable aperture device, there is a receiving groove, and inside the receiving groove, there are balls that contact the inner end face of the housing.

[0018] To achieve at least one of the above purposes, the technical solution adopted by the present invention is: An actuator, comprising: a carrier, and the above-mentioned lens assembly is installed on the carrier.

[0019] As a preference, the brake further includes a base, and the carrier is constrained to the base in a movable manner; on the base and / or the carrier, there is a second power connection point, and on the variable aperture device, there is a circuit board coupled to the second power connection point.

[0020] As a preference, on the second outer side surface of the lens, there is a third convex portion, inside the carrier, there is a lens mounting hole, and on the inner wall of the lens mounting hole, there is an L-shaped second groove, and the second groove includes a third section and a fourth section. The third section axially extends from the edge of the first end of the lens mounting hole towards the second end of the lens mounting hole, and the fourth section circumferentially extends from the extending end of the third section for the third convex portion to be inserted into the fourth section through the third section.

[0021] To achieve at least one of the above purposes, the technical solution adopted by the present invention is: An assembling method of an actuator as described above, which sequentially includes the following steps: Step 1, insert the lens into the lens mounting hole and insert the third convex portion into the fourth section of the second groove; Step 2, apply an adhesive on the step surface of the step portion of the lens; Step 3, align the circuit board of the variable aperture device with the second power connection point of the base, and then place the variable aperture device against the step surface of the step portion, so that the variable aperture device and the lens are bonded through the adhesive.

[0022] To achieve at least one of the above purposes, the technical solution adopted by the present invention is: An imaging module that applies the actuator as described above.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] (1) The variable aperture device is connected to the lens through the laterally extending gluing area and the longitudinally extending gluing area, so as to increase the bonding area, further improve the connection strength between the variable aperture device and the lens, and is beneficial to reducing the risk of the variable aperture device falling off from the lens.

[0025] (2) The first convex part and the second outer side surface cooperate to limit the relative position of the variable aperture device and the lens in the radial direction, which is beneficial to reducing the deviation between the optical axis of the variable aperture device and the optical axis of the lens;

[0026] (3) The cooperation between the first convex part and the second convex part can not only further increase the contact area with the adhesive, but also limit the relative position of the variable aperture device and the lens in both the circumferential and axial dimensions, making the connection between the variable aperture device and the lens more firm, thus making the reliability of the lens assembly better, and can also pre-position the variable aperture device and the lens during the assembly process;

[0027] (4) By designing the longitudinal gap between the light-emitting end face of the variable aperture device and the step surface of the step part, and the transverse gap between the inner side surface of the first convex part of the variable aperture device and the second outer side surface, the thickness of the adhesive can be made more uniform, thereby avoiding variations caused by different shrinkage degrees during the curing process, which ultimately affects the alignment of the optical axis of the variable aperture device and the optical axis of the lens.

[0028] (5) By arranging the brush filaments at intervals along the axial direction and making the "V" - shaped openings of the brush filaments face the rotating ring, the second end of the brush filaments can press against the slip ring. This can not only ensure good contact between the brush filaments and the slip ring, but also, by reasonably setting the distribution mode of the brush filaments, enable the brush filaments to evenly press the rotating ring, which is beneficial to keeping the rotating ring coaxial with the housing;

[0029] (6) First, the lens is positioned and fixedly installed with the carrier through the third convex part and the second groove, and then the variable aperture device is positioned and welded with the carrier through the solder joints on the circuit board and the second electrical connection points, and then the variable aperture device is bonded to the lens. That is to say, both the lens and the variable aperture device are aligned with reference to the carrier and / or the base, so as to improve the assembly accuracy of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1A FIG. is a schematic structural diagram of a lens assembly according to some embodiments of the present application;

[0031] Figure 1B FIG. is a cross - sectional view of a lens assembly according to some embodiments of the present application;

[0032] Figure 2A FIG. is a schematic structural diagram of a lens assembly according to some other embodiments of the present application;

[0033] Figure 2B FIG. is a cross - sectional view of a lens assembly according to some other embodiments of the present application;

[0034] Figure 3A FIG. is a schematic structural diagram of a lens assembly according to some other embodiments of the present application;

[0035] Figure 3B A cross-sectional view of a lens assembly according to some other embodiments of the present application;

[0036] Figure 4A A schematic structural diagram of a variable aperture device according to some embodiments of the present application;

[0037] Figure 4B An exploded view of a variable aperture device according to some embodiments of the present application;

[0038] Figure 4C A partial exploded view of a variable aperture device according to some embodiments of the present application

[0039] Figure 4D An assembly structure diagram of a rotating ring according to some embodiments of the present application;

[0040] Figure 4E A structural diagram of a housing according to some embodiments of the present application;

[0041] Figure 5A A structural diagram of a lens assembly according to some embodiments of the present application;

[0042] Figure 5B An exploded view of a lens assembly according to some embodiments of the present application;

[0043] Figure 6A A structural diagram of a brake according to some embodiments of the present application;

[0044] Figure 6B A cross-sectional view of a brake according to some embodiments of the present application;

[0045] Figure 6C Of the present application Figure 6B A partial enlarged view of location A in;

[0046] Figure 6D A partial exploded view one of a brake according to some embodiments of the present application;

[0047] Figure 6E Of the present application Figure 6D A partial enlarged view of location B in;

[0048] Figure 6F A partial exploded view two of a brake according to some embodiments of the present application.

[0049] In the figure: 1, lens assembly; 2, lens; 21, step portion; 211, step surface; 22, first outer side surface; 23, second outer side surface; 24, notch; 25, second convex portion; 26, third convex portion; 3, variable aperture device; 31, light-emitting end face; 32, first convex portion; 321, first section; 322, second section; 323, first groove; 33, housing; 331, first electrical connection point; 34, rotating ring; 351, driving magnet; 352, driving coil; 36, brush wire; 361, first end; 362, second end; 37, slip ring; 381, receiving groove; 382, ball; 383, magnetic part; 384, magnetic attracting part; 39, circuit board; 4, brake; 41, carrier; 411, lens mounting hole; 412, second groove; 4121, third section; 4122, fourth section; 42, base; 421, second electrical connection point; 43, adhesive. Detailed implementation manners

[0050] Next, in combination with the detailed implementation manners, the present invention will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0051] In the description of the present invention, it should be noted that for the orientation terms, if there are terms such as "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation and position relationship is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention 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 cannot be understood as limiting the specific protection scope of the present invention.

[0052] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence.

[0053] In some embodiments of the present application, as Figures 1A to 3B shown, the lens assembly 1 includes a lens 2 and a variable aperture device 3. A step portion 21 is provided on the side wall of the lens 2, and the step surface 211 of the step portion 21 divides the outer side surface of the lens barrel into a first outer side surface 22 and a second outer side surface 23. The first outer side surface 22 is adjacent to the light incident end of the lens 2 (i.e., Figure 6A the upper end of the lens 2 shown), and the second outer side surface 23 is adjacent to the light emitting end of the lens 2 (i.e., Figure 6AThe lower end of the lens 2 shown). Among them, "the first outer side surface 22 is adjacent to the light incident end of the lens 2" means that in the axial direction, the distance between the first outer side surface 22 and the light incident end of the lens 2 is less than the distance between the first outer side surface 22 and the light exiting end of the lens 2. "The second outer side surface 23 is adjacent to the light exiting end of the lens 2" means that in the axial direction, the distance between the second outer side surface 23 and the light exiting end of the lens 2 is less than the distance between the first outer side surface 22 and the light incident end of the lens 2.

[0054] In some embodiments of the present application, the variable aperture device 3 abuts against the step surface 211 of the step portion 21, that is, in the optical path, the variable aperture device 3 is located upstream of the lens 2. The variable aperture device 3 is provided with a first convex portion 32 at a position adjacent to its light exiting end, and an adhesive 43 is filled between the light exiting end face 31 of the variable aperture device 3 and the step surface 211 of the step portion 21, and between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23, so as to improve the connection strength between the variable aperture device 3 and the lens 2.

[0055] It can be understood that in the prior art, only the adhesive 43 is filled between the light exiting end face 31 of the variable aperture device 3 and the step surface 211 of the step portion 21, so that the variable aperture device 3 is only mounted and connected to the lens 2 by relying on the laterally extending glued area, and the bonding area is insufficient, resulting in low bonding strength. Since the variable aperture device 3 is heavy, the variable aperture device 3 is likely to be separated from the lens 2, resulting in low reliability of the lens assembly 1. In some embodiments of the present application, by filling the adhesive 43 between the light exiting end face 31 of the variable aperture device 3 and the step surface 211 of the step portion 21, and between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23, in addition to the laterally extending glued area between the variable aperture device 3 and the lens 2, a longitudinally extending glued area is also added, which can not only increase the bonding area, but also the design of the first convex portion 32 can increase the dimension of the constraint between the variable aperture device 3 and the lens 2, mainly reflected in that the first convex portion 32 physically blocks the lens 2 in the lateral direction, and also reflected in that the adhesive 43 connects the first convex portion 32 and the second outer side surface 23 in the lateral direction. Both of these aspects can improve the connection strength between the variable aperture device 3 and the lens 2, which is beneficial to reducing the risk of the variable aperture device 3 falling off from the lens 2.

[0056] In some embodiments, such as Figure 1A and Figure 1BAs shown, the first convex portion 32 extends from the light-emitting end of the variable aperture device 3 toward the light-emitting end of the lens 2. It can be understood that due to the parameter limitation of the field of view angle of the optical lens 2, the diameter of the aperture of the variable aperture device 3 needs to be larger than the diameter of the incident aperture of the lens 2, so that the housing 33 and the blades of the variable aperture device 3 are necessarily located outside the periphery of the incident end of the lens 2. If the first convex portion 32 extends radially outward, a local swelling structure needs to be made on the side wall of the lens 2 to form a dispensing groove, which will cause local swelling of the outer periphery of the lens 2. This local swelling structure will not only occupy the AF (Auto Focus) stroke space of the lens 2, resulting in the compression of the AF stroke. If the original AF stroke needs to be maintained, the overall height of the camera module needs to be increased; this local swelling structure will also occupy the OIS stroke of the lens 2. In order to ensure the safety distance (anti-collision) between the lens 2 and the side wall of the outer cover during OIS (Optical Image Stabilization) adjustment, the circumferential dimension of the camera module also needs to be increased, which is not conducive to the miniaturization of the camera module and will cause the lens mounting hole 411 of the terminal product to increase accordingly. In this embodiment, the first convex portion 32 extends from the light-emitting end of the variable aperture device 3 toward the light-emitting end of the lens 2, which can increase the connection firmness between the variable aperture device 3 and the lens 2 while avoiding increasing the size of the lens assembly 1. For this design of the first convex portion 32, when applying the adhesive 43, only the step surface 211 of the step portion 21 is coated with the adhesive 43, and then the variable aperture device 3 is abutted against the step surface 211 of the step portion 21. In this way, the excess adhesive 43 can overflow from the gap between the light-emitting end face 31 of the variable aperture device 3 and the step surface 211 of the step portion 21 into the gap between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23, so that the adhesive 43 is also filled in the gap between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23, realizing the bonding of the variable aperture device 3 and the lens 2. The coating process of this adhesive 43 is relatively simple.

[0057] In some other embodiments, such as Figure 2A and Figure 2BAs shown, the second outer side surface 23 is recessed inward at a position adjacent to the step surface 211 of the step portion 21, forming a notch 24 for accommodating the first convex portion 32. The design of this notch 24 can further increase the bonding area and filling region of the adhesive 43, thereby enabling a more secure connection between the variable aperture device 3 and the lens 2. Moreover, the cooperation between the notch 24 and the first convex portion 32 can also limit the circumferential rotation of the variable aperture device 3. For this design of the first convex portion 32, when applying the adhesive 43, it is necessary to first apply the adhesive 43 to the step surface 211 of the step portion 21, and then place the variable aperture device 3 against the step surface 211 of the step portion 21. In this way, the excess adhesive 43 can overflow from the gap between the light-emitting end face 31 of the variable aperture device 3 and the step surface 211 of the step portion 21 into the gap between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23, so that the adhesive 43 is also filled between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23. However, since the amount of overflowing glue is not sufficient to fill the notch 24, it is necessary to reapply the adhesive 43 to the notch 24 to fill the notch 24 with a sufficient amount of adhesive 43, making the bonding between the variable aperture device 3 and the lens 2 more secure, and the amount of overflowing glue more controllable and the bonding quality better. However, due to the notch 24, the side wall of the lens 2 is locally thinned, and the risk of the side wall of the lens 2 cracking is higher.

[0058] In some other embodiments, as Figure 3A and Figure 3B shown, the first convex portion 32 includes a first section 321 and a second section 322. The first section 321 extends from the light-emitting end of the variable aperture device 3 towards the light-emitting end of the lens 2, and the second section 322 extends circumferentially from the extending end of the first section 321, so that the first convex portion 32 is L-shaped, and the first convex portion 32 and the light-emitting end face 31 of the variable aperture device 3 jointly define a first groove 323 that extends circumferentially. The second outer side surface 23 is provided with an outwardly protruding second convex portion 25, and the second convex portion 25 is inserted into the first groove 323.

[0059] When the lens 2 rotates relative to the variable aperture device 3, the second convex portion 25 is adapted to slide from the opening end of the first groove 323 that is far from the first section 321 into the first groove 323 and is located between the second section 322 and the light-emitting end face 31 of the variable aperture device 3, realizing the pre-positioning of the variable aperture device 3 and the lens 2. It can be understood that by providing the protruding second convex portion 25 on the second outer side surface 23, it is possible to avoid the local wall thickness reduction of the lens 2 from affecting the optical performance of the lens 2. However, during the processing of the first convex portion 32 and the second convex portion 25, rotational processing is required, the manufacturing difficulty is relatively large, and the requirements for processing equipment are higher.

[0060] For the design of the first convex portion 32, when applying the adhesive 43, first apply the adhesive 43 to the step surface 211 of the step portion 21, and then place the variable aperture device 3 against the step surface 211 of the step portion 21. In this way, the excess adhesive 43 can overflow from the gap between the light-emitting end face 31 of the variable aperture device 3 and the step surface 211 of the step portion 21 into the gap between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23, so that the adhesive 43 is also filled in the gap between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23. In addition, it is necessary to reapply the adhesive 43 to the edge of the second convex portion 25 in the first groove 323 to further increase the bonding area between the variable aperture device 3 and the lens 2, thereby improving the connection strength. The cooperation between the first convex portion 32 and the second convex portion 25 can not only limit the relative position of the variable aperture device 3 and the lens 2 in the circumferential direction, but also limit the relative position of the variable aperture device 3 and the lens 2 in the axial direction, so as to reduce the risk of relative axial movement between the variable aperture device 3 and the lens 2, which is beneficial to improving the connection reliability between the variable aperture device 3 and the lens 2.

[0061] In some embodiments of the present application, as Figures 1A to 3B shown, in the longitudinal direction, the gap between the light-emitting end face 31 of the variable aperture device 3 and the step surface 211 of the step portion 21 is equal everywhere; and / or, in the transverse direction, the gap between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23 is equal everywhere. It can be understood that the gap between the light-emitting end face 31 of the variable aperture device 3 and the step surface 211 of the step portion 21 of the lens 2, and the gap between the inner side surface of the first convex portion 32 of the variable aperture device 3 and the second outer side surface 23 of the lens 2, the gap values are allowed to be equal within the allowable tolerance range of processing, that is to say, the gap values can deviate within the tolerance range. The longitudinal direction in this embodiment is not limited to the axial direction, but refers to the direction perpendicular to the step surface 211 of the step portion 21; the transverse direction is not limited to the radial direction, but refers to the direction perpendicular to the extension direction of the second outer side surface 23.

[0062] It is worth mentioning that the thicker the colloid between the light-emitting end face 31 of the variable aperture device 3 and the step face 211 of the step portion 21 of the lens 2, the greater the shrinkage amount after the colloid is cured. Excessive differences in the thickness of the adhesive 43 are likely to cause variations after curing. In the above-mentioned embodiment, the gaps between the light-emitting end face 31 and the step face 211 are equal everywhere, and the gaps between the inner side surface of the first convex portion 32 and the second outer side surface 23 are equal everywhere, so that the thickness of the colloid between the light-emitting end face 31 and the step face 211 is more uniform, and the thickness of the colloid between the inner side surface of the first convex portion 32 and the second outer side surface 23 is more uniform, reducing the differences in the thickness of the colloid in different regions, further reducing the differences in the shrinkage amounts of the colloid in different regions after curing, making the adhesive force between the variable aperture device 3 and the lens 2 more uniform, and further reducing the variations generated by the shrinkage during the curing of the glue.

[0063] In some embodiments, such as Figures 1A to 3B shown, there are at least two first convex portions 32, which are arranged at intervals in the circumferential direction, so as to ensure the bonding area between the variable aperture device 3 and the lens 2. It can be understood that the more the first convex portions 32 are provided, the larger the bonding area between the variable aperture device 3 and the lens 2, and the variable aperture device 3 and the lens 2 can be connected more firmly. In some embodiments, the included angle between two adjacent first convex portions 32 in the circumferential direction is α, and 60° ≤ α ≤ 120°. The reason for this design is as follows: When using UV thermosetting glue as the adhesive 43, it is necessary to irradiate the gluing area with an ultraviolet lamp after applying the glue so that the UV thermosetting glue is cured to bond the variable aperture device 3 and the lens 2. If the included angle between two adjacent first convex portions 32 in the circumferential direction is too large, that is, the distance between two adjacent first convex portions 32 in the circumferential direction is far, it is beneficial to the exposure of the gluing area between the first convex portion 32 and the second outer side surface 23, which is beneficial to improving the bonding quality. However, the far distance between two adjacent first convex portions 32 in the circumferential direction will reduce the number and circumferential length of the first convex portions 32, which is not conducive to increasing the bonding area to improve the bonding strength; if the included angle between two adjacent first convex portions 32 in the circumferential direction is too small, that is, the distance between two adjacent first convex portions 32 in the circumferential direction is close, it is beneficial to increase the number and circumferential length of the first convex portions 32, and further increase the bonding area, and the gluing area between the first convex portion 32 and the second outer side surface 23 is exposed. However, the close distance between two adjacent first convex portions 32 in the circumferential direction will be unfavorable to the exposure of the gluing area between the first convex portion 32 and the second outer side surface 23, resulting in difficulty for the UV thermosetting glue to be completely cured, and further reducing the bonding quality. Considering both the bonding area and the bonding quality, preferably, the included angle between two adjacent first convex portions 32 in the circumferential direction is 60° ≤ α ≤ 120°.

[0064] In some embodiments, such as Figures 4A to 4EAs shown, the variable aperture device 3 includes a housing 33 and a rotating ring 34 disposed inside the housing 33. The outer sidewall of the housing 33 is provided with a first electrical connection point 331, and its inner sidewall is provided with a driving magnet 351 and a brush wire 36. The first end 361 of the brush wire 36 is coupled to the first electrical connection point 331. The outer sidewall of the rotating ring 34 is provided with a driving coil 352 and a slip ring 37. The driving coil 352 is opposite to the driving magnet 351, and the slip ring 37 is coupled to the driving coil 352 and abuts against the second end 362 of the brush wire 36; a blade group is drivingly connected to the rotating ring 34.

[0065] Specifically, the housing 33 of the variable aperture device 3 is fixedly mounted on the stepped portion 21 of the lens 2, the rotating ring 34 is rotatably accommodated in the housing 33, the blades of the blade group are symmetrically distributed relative to the optical axis center, one end of the blade is rotatably connected to the housing 33, and the other end of the blade is slidably connected to the rotating ring 34. When the rotating ring 34 rotates relative to the housing 33, the blade group can be driven to rotate to further change the diameter of the aperture, so as to adjust the light incident amount of the lens assembly 1. As Figure 4D shown, the driving coil 352 is fixed on the outer sidewall of the rotating ring 34, the driving magnet 351 is fixed on the inner sidewall of the housing 33, and the driving magnet 351 and the driving coil 352 are oppositely arranged, so that the driving coil 352 is located in the magnetic field of the driving magnet 351. When the driving coil 352 is energized, the driving coil 352 can cooperate with the driving magnet 351 to generate a Lorentz force, further causing the driving coil 352 and the rotating ring 34 to rotate relative to the housing 33 to change the size of the aperture formed by the blades. A slip ring 37 is also provided on the outer sidewall of the rotating ring 34. The slip ring 37 extends circumferentially along the outer sidewall of the rotating ring 34 and is coupled to the driving coil 352 to be electrically connected to the driving coil 352; the brush wire 36 is disposed between the housing 33 and the rotating ring 34. The first end 361 of the brush wire 36 is coupled to the first electrical connection point 331 on the outer sidewall of the housing 33. Since the brush wire 36 is usually a metal wire and is easily deformed under pressure, the second end 362 of the brush wire 36 elastically presses against the slip ring 37. When the rotating ring 34 rotates relative to the housing 33, the second end 362 of the brush wire 36 abuts against and slides relative to the slip ring 37. That is to say, the driving coil 352 is sequentially connected to other circuits of the variable aperture device 3 through the slip ring 37, the brush wire 36, and the first electrical connection point 331.

[0066] It can be understood that in the prior art, the driving magnet 351 is fixed to the rotating ring 34, and the driving coil 352 is fixed to the housing 33, which is convenient for connecting the driving coil 352 to an external circuit. In this embodiment, the driving coil 352 is fixed to the rotating ring 34, and the driving magnet 351 is fixed to the housing 33, so as to reduce the weight of the load on the rotating ring 34, which is beneficial to reducing the driving force required to drive the rotation of the rotating ring 34. And through the slip ring 37 and the brush wire 36, the connection between the driving coil 352 and the external circuit can be realized.

[0067] In some embodiments, there are at least two groups of brush wires 36, which are evenly spaced along the circumferential direction; each group of brush wires 36 has two brush wires 36 arranged in a V shape, and the opening of the V shape faces the rotating ring 34. That is to say, the two brush wires 36 of each group are arranged in a "V" shape between the housing 33 and the rotating ring 34. The second ends 362 of the two brush wires 36 are far away from each other, that is, the opening of the "V" shape faces the rotating ring 34 and abuts against the slip ring 37 on the rotating ring 34. When the rotating ring 34 slides relative to the housing 33, the brush wire 36 can move relative to the slip ring 37 and be electrically connected to the slip ring 37; the first ends 361 of the two brush wires 36 are close to each other, that is, the tip of the "V" shape faces the housing 33 and is coupled to the first power connection point 331, so as to be connected to other circuits of the variable aperture device 3. Each group of brush wires 36 is evenly spaced along the circumferential direction between the rotating ring 34 and the housing 33. The second end 362 of the brush wire 36 abuts against the slip ring 37, and the "V" shape opening of the brush wire 36 faces the rotating ring 34, which further enables the rotating ring 34 to be evenly squeezed, which is beneficial to keeping the rotating ring 34 coaxially arranged with the housing 33, that is, reducing the risk that the center of the rotating ring 34 deviates from the optical axis.

[0068] It can be understood that there is no limit to the circumferential extension angle of the slip ring 37. It can be a complete ring shape, an open ring, or a slip ring 37 composed of multiple arc-shaped strips.

[0069] In some embodiments, as Figure 4C shown, a receiving groove 381 is provided on one end face of the rotating ring 34 adjacent to the light exit end of the variable aperture device 3. A ball 382 in contact with the inner end face of the housing 33 is provided inside the receiving groove 381, which can reduce the friction between the rotating ring 34 and the housing 33. At the same time, the ball 382 is received in the receiving groove 381, which is beneficial to reducing the distance between the rotating ring 34 and the light exit end adjacent to the variable aperture device 3, and further reducing the axial dimension of the variable aperture device 3.

[0070] Furthermore, as Figure 4CAs shown in the figure, a magnetic member 383 such as a magnet is provided on one end face of the rotating ring 34 adjacent to the light-emitting end of the variable aperture device 3, and a magnetic attracting member 384 such as a metal sheet is provided on the outer shell 33. Through the attraction between the magnetic member 383 and the magnetic attracting member 384, the ball 382 can be constrained between the rotating ring 34 and the outer shell 33.

[0071] In some embodiments, the blade group and the rotating ring are drivingly connected by means of convex posts and sliding grooves.

[0072] The actuator in the present application includes: a carrier 41, and the carrier 41 is mounted with the lens assembly 1 as described above.

[0073] In some embodiments, as Figures 5A to 6F shown, the brake 4 further includes a base 42, and the carrier 41 is constrained to the base 42 in a movable manner; a second power connection point 421 is provided on the base 42 and / or the carrier 41, and a circuit board 39 coupled to the second power connection point 421 is provided on the variable aperture device 3. The circuit board 39 is also coupled to the first power connection point 331, so that the second power connection point 421 can supply power to the brush wire 36 through the circuit board 39 and the first power connection point 331. That is to say, the carrier 41 can carry the lens assembly 1 and move relative to the base 42 together to achieve the AF function and / or the OIS function.

[0074] Among them, the carrier 41 can be constrained to the base 42 through a suspension device such as a shrapnel, an SMA wire, etc., and a driving device such as a component of a magnet and a coil, a piezoelectric device, etc. is provided between the base 42 and the carrier 41.

[0075] In some embodiments, as Figures 6A to 6E shown, a third convex portion 26 is provided on the second outer side surface 23 of the lens 2, a lens mounting hole 411 is provided inside the carrier 41, and an L-shaped second groove 412 is provided on the inner wall of the lens mounting hole 411. The second groove 412 includes a third section 4121 and a fourth section 4122. The third section 4121 extends axially from the edge of the first end of the lens mounting hole 411 (i.e., Figure 6D the upper end of the lens mounting hole 411 in the figure) toward the second end of the lens mounting hole 411 (i.e., Figure 6D the lower end of the lens mounting hole 411 in the figure), and the fourth section 4122 extends circumferentially from the extending end of the third section 4121 for the third convex portion 26 to be inserted into the fourth section 4122 through the third section 4121.

[0076] Specifically, as Figure 6E shown, the third section 4121 of the second groove 412 starts from the edge of the first end of the lens mounting hole 411, that is, the edge of the end close to the light incident end of the carrier 41 (i.e., Figure 6D the upper edge of the lens mounting hole 411 in the figure) and faces the light emitting end of the carrier 41 (i.e., Figure 6DIt extends in the direction of the lower end of the lens mounting hole 411 of the middle lens. The fourth section 4122 of the second groove 412 extends circumferentially along the wall surface of the lens mounting hole 411 of the carrier 41 from the end of the third section 4121 to define an "L"-shaped second groove 412. The second outer side surface 23 of the lens 2 is provided with a radially outwardly protruding and circumferentially extending "I"-shaped third protrusion 26. The third protrusion 26 is adapted to the second groove 412. When the lens 2 is mounted on the carrier 41, the third protrusion 26 is adapted to first axially move along the third section 4121 of the second groove 412, that is, a part of the lens 2 axially enters the lens mounting hole 411 of the carrier 41, and the third protrusion 26 is adapted to then circumferentially move along the fourth section 4122 of the second groove 412, that is, rotate the lens 2 relative to the carrier 41.

[0077] It can be understood that the second groove 412 and the third protrusion 26 cooperate to limit the relative position of the lens assembly 1 and the carrier 41 axially, reducing the risk of relative axial movement between the lens assembly 1 and the carrier 41, which is beneficial to improving the connection reliability between the lens assembly 1 and the carrier 41. More preferably, after the lens 2 and the carrier 41 are connected through the cooperation of the second groove 412 and the third protrusion 26, an adhesive 43 is applied in the second groove 412 to encapsulate the connection position between the second groove 412 and the third protrusion 26, thereby further enhancing the firmness of the connection between the lens 2 and the carrier 41.

[0078] Based on the actuator with the above structure, the assembly method of the actuator successively includes the following steps: Step 1: Insert the lens 2 into the lens mounting hole 411 and insert the third protrusion 26 into the fourth section 4122 of the second groove 412.

[0079] Step 2: Apply the adhesive 43 to the step surface 211 of the step portion 21 of the lens 2.

[0080] Step 3: Align the circuit board 39 of the variable aperture device 3 with the second power connection point 421 of the base 42, and then place the variable aperture device 3 against the step surface 211 of the step portion 21 to bond the variable aperture device 3 and the lens 2 through the adhesive 43.

[0081] Step 4: Apply the adhesive 43 in the second groove 412 of the carrier 41.

[0082] Specifically, in this embodiment, as Figure 6D shown, first pre-position the lens 2 and the carrier 41 through the third protrusion 26 and the second groove 412, and inject glue to fix the lens 2 and the carrier 41, which is beneficial to avoiding axial movement and circumferential rotation of the lens 2 relative to the carrier 41; as Figure 6FAs shown in the figure, an adhesive 43 such as UV thermosetting glue is applied to the step surface 211 of the step portion 21 of the lens 2. It can be understood that at this time, the UV thermosetting glue has not been exposed and cured, and the variable aperture device 3 can move and rotate relative to the lens 2. The solder joints on the circuit board 39 of the variable aperture device 3 are aligned with the second power connection points 421 on the carrier 41 and welded. Finally, the UV thermosetting glue between the variable aperture device 3 and the lens 2 is cured, so that the variable aperture device 3 and the lens 2 can be reliably bonded, effectively reducing the risk of the variable aperture device 3 falling off. The circuit board 39 is an FPC board.

[0083] In addition, if the variable aperture device 3 and the lens 2 are assembled first, and then the lens assembly 1 and the carrier 41 are assembled, it is difficult to ensure the alignment of the circuit board 39 with the second power connection points 421, as well as the third convex portion 26 and the second groove 412 at the same time. When the same alignment accuracy needs to be guaranteed, the actuator assembly process is more difficult. In this embodiment, the lens 2 and the carrier 41 are first positioned and fixedly installed through the third convex portion 26 and the second groove 412, and then the variable aperture device 3 and the carrier 41 are positioned and welded through the solder joints on the circuit board 39 and the second power connection points 421. Finally, the variable aperture device 3 and the lens 2 are bonded. That is to say, both the lens 2 and the variable aperture device 3 are aligned with reference to the carrier 42, so as to improve the assembly accuracy.

[0084] Furthermore, this embodiment avoids applying glue to the variable aperture device 3 and the lens 2 in an inverted manner, that is, it avoids placing the lens 2 on top and the variable aperture device 3 at the bottom, which can prevent the end face of the light incident end of the variable aperture device 3 from being worn and scratched. At the same time, the first convex portion 32 where the adhesive 43 needs to be injected is located on the outer periphery of the second outer side surface 23 of the lens 2, which can avoid the limited space for the injection needle to extend when injecting the adhesive 43, facilitating the insertion, withdrawal, and adjustment of the injection needle when injecting the adhesive 43, and also being beneficial to the exposure to completely cure the UV thermosetting glue, further improving the bonding efficiency and bonding quality between the variable aperture device 3 and the lens barrel lens 2.

[0085] In some embodiments, the imaging module includes a photosensitive component, which is assembled with the aforementioned actuator, and the lens assembly 1 is located on the light sensing path of the photosensitive component.

[0086] The above describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A lens assembly, It is characterized in that include: A lens, a side wall of which is provided with a step portion, wherein the step surface of the step portion divides the outer side surface of the lens into a first outer side surface and a second outer side surface, wherein the first outer side surface is adjacent to the light incident end of the lens, and the second outer side surface is adjacent to the light exit end of the lens; A variable aperture device is supported by the step surface of the step portion. The variable aperture device is provided with a first convex portion at a position adjacent to its light emitting end, and adhesive is filled between the end surface of the light emitting end of the variable aperture device and the step surface of the step portion, as well as between the inner side surface of the first convex portion of the variable aperture device and the second outer side surface.

2. The lens assembly according to claim 1, It is characterized in that The first convex portion extends from the light-emitting end of the variable aperture device toward the light-emitting end of the lens.

3. The lens assembly according to claim 2, It is characterized in that The second outer side surface is recessed inwardly at a position adjacent to the step surface of the step portion to form a notch for accommodating the first convex portion.

4. The lens assembly according to claim 1, It is characterized in that The first convex portion includes a first section and a second section, the first section extends from the light output end of the variable aperture device toward the light output end of the lens, and the second section extends circumferentially from the extended end of the first section, so that the first convex portion is L-shaped, and the first convex portion and the end surface of the light output end of the variable aperture device jointly define a first groove, and the second outer side surface is provided with a second convex portion protruding outward, and the second convex portion is inserted into the first groove.

5. The lens assembly according to claim 1, It is characterized in that In the longitudinal direction, the gap between the light-emitting end face of the variable aperture device and the step surface of the step portion is equal everywhere; and / or, in the transverse direction, the gap between the inner side face of the first convex portion and the second outer side face of the variable aperture device is equal everywhere.

6. The lens assembly according to claim 1, It is characterized in that There are at least two first protrusions, which are spaced apart in the circumferential direction; wherein the angle between two adjacent first protrusions in the circumferential direction is α, and 60°≤α≤120°.

7. The lens assembly according to any one of claims 1 to 6, It is characterized in that The variable aperture device comprises: The outer wall of the housing is provided with a first power connection point, and the inner wall of the housing is provided with a driving magnet and a brush wire, wherein the first end of the brush wire is coupled to the first power connection point; A rotating ring is arranged inside the housing, and a driving coil and a slip ring are arranged on the outer wall of the rotating ring, wherein the driving coil is opposite to the driving magnet, and the slip ring is coupled to the driving coil and contacts the second end of the brush wire; The blade group is transmission-connected to the rotating ring.

8. The lens assembly according to claim 7, It is characterized in that There are at least two groups of brush filaments, which are spaced apart in the circumferential direction; each group of brush filaments has two brush filaments arranged in a V shape, and the opening of the V shape faces the rotating ring.

9. The lens assembly according to claim 7, It is characterized in that One end face of the rotating ring adjacent to the light-emitting end of the variable aperture device is provided with a receiving groove, and balls contacting the inner end face of the housing are arranged inside the receiving groove.

10. An actuator, characterized in that, comprising: a carrier, and the lens assembly as described in any one of claims 1 to 9 is mounted on the carrier.

11. The actuator according to claim 10, characterized in that, further comprising a base, and the carrier is movably constrained to the base; a second power connection point is provided on the base and / or the carrier, and a circuit board coupled to the second power connection point is provided on the variable aperture device.

12. The actuator according to claim 11, characterized in that, a third convex portion is provided on the second outer side surface of the lens, a lens mounting hole is provided inside the carrier, an L-shaped second groove is provided on the inner wall of the lens mounting hole, the second groove includes a third section and a fourth section, the third section axially extends from the edge of the first end of the lens mounting hole towards the second end of the lens mounting hole, and the fourth section circumferentially extends from the extending end of the third section for the third convex portion to be inserted into the fourth section through the third section.

13. An assembling method of the actuator as described in claim 12, characterized in that, successively comprises the following steps: Step 1, inserting the lens into the lens mounting hole and inserting the third convex portion into the fourth section of the second groove; Step 2, applying an adhesive to the step surface of the step portion of the lens; Step 3, aligning the circuit board of the variable aperture device with the second power connection point of the base, and then placing the variable aperture device against the step surface of the step portion, so that the variable aperture device and the lens are bonded by the adhesive.

14. An imaging module, characterized in that, the actuator as described in any one of claims 10 to 12 is applied.

Images