Lens driving mechanism

Abstract

The utility model discloses a lens driving mechanism, which comprises a base, a plurality of support rods, a frame and a carrier, and a first bump is arranged on the top surface of the base. The bottom ends of the multiple supporting rods are connected with the base. The frame is located above the base and connected with the top end of the supporting rod, the frame is arranged to move in the horizontal direction, a first groove for containing the first protruding block is formed in the bottom face of the frame, and damping glue is arranged between the top wall of the first groove and the first protruding block. The carrier is located in the frame, elastically connected with the frame and arranged to be capable of moving in the vertical direction, and the carrier is used for installing a lens.

Description

Technical Field

[0001] The utility model relates to the technical field of optical element driving, in particular to a lens driving mechanism. Background Art

[0002] With the development of technology, many electronic devices (such as smart phones or digital cameras) now have the function of taking photos or recording videos. These electronic devices are becoming more and more popular and are developing in the direction of convenient and lightweight designs to provide users with more choices.

[0003] Some electronic devices with camera or video recording functions are equipped with a lens driving module to drive an optical component such as a lens to move, thereby achieving the functions of autofocus and optical image stabilization (OIS). Light can pass through the aforementioned optical component to form an image on a photosensitive component.

[0004] In the prior art, the lens driving mechanism includes a frame, a carrier, an upper spring leaf, a lower spring leaf and a base, wherein the carrier is provided with a coil and can be movably mounted in the frame, and the carrier is used to mount the lens. The upper spring leaf is elastic and connected to the top of the frame and the top of the carrier, and the lower spring leaf is also elastic and connected to the bottom of the carrier and the bottom of the frame, and the upper spring leaf and the lower spring leaf movably connect the carrier to the frame. The frame is movably mounted above the base through a plurality of suspension wires, and can move in a direction perpendicular to the optical axis of the lens to prevent the lens from shaking. The carrier is mounted in the frame and can move in the direction of the optical axis of the lens to adjust the focal length of the lens.

[0005] As electronic devices are designed to be more and more lightweight, the requirements for the size of the lens drive mechanism that drives the lens movement are becoming higher and higher. It is not only required to have a lighter weight, but also a smaller size. Therefore, there is a need to continuously improve the size of the lens drive mechanism. Utility Model Content

[0006] The utility model aims to provide a lens driving mechanism to solve the problems of the prior art.

[0007] In order to solve the above technical problems, the embodiment of the utility model provides a lens driving mechanism, comprising:

[0008] A base, wherein a first protrusion is provided on a top surface of the base;

[0009] A plurality of support rods, wherein the bottom ends of the plurality of support rods are respectively connected to the base;

[0010] a frame, the frame being located above the base and connected to the top end of the support rod, the frame being configured to be movable in a horizontal direction, the bottom surface of the frame being provided with a first groove for accommodating the first protrusion, and a damping rubber being provided between the top wall of the first groove and the first protrusion; and

[0011] A carrier is located in the frame and elastically connected to the frame and is configured to be movable in a vertical direction, and is used for mounting a lens.

[0012] In one embodiment, a convex strip is provided on the top surface of the first convex block, and the convex strip extends along a portion of the radial inner edge of the first convex block;

[0013] A second convex block is disposed on the top wall of the first groove, and a bottom surface of the second convex block is located inside the convex strip;

[0014] The damping glue is located in the convex strip and between the second convex block and the first convex block.

[0015] In one embodiment, a second groove is disposed on the radial outer side of the second protrusion, and the second groove is formed by the bottom surface of the second protrusion being recessed to the top wall of the first groove.

[0016] In one embodiment, a third groove is disposed on the top wall of the first groove, and the third groove is located on the top surface of the second groove.

[0017] In one embodiment, the first protrusion is located at an edge of the base, and the support rod is located radially inside the first protrusion.

[0018] In one embodiment, the lens driving mechanism further includes:

[0019] an upper spring sheet connected to the frame and the top of the carrier; and

[0020] A lower spring sheet connected to the frame and the bottom of the carrier;

[0021] The top wall of the first groove is provided with an avoidance through hole, the avoidance through hole extends to the top surface of the frame and is located radially inward of the second protrusion;

[0022] The top end of the support rod passes through the avoidance through hole and is connected to the upper spring sheet.

[0023] In one embodiment, the four first protrusions are respectively located at four corners of the base;

[0024] The four first grooves are located at four corners of the frame and open toward the radial outside of the frame;

[0025] The convex strip extends along the radial inner edge of the first convex block;

[0026] The bottom ends of the four support rods are respectively connected to the base, and the top ends respectively pass through the avoidance through holes of the four first grooves and are connected to the upper spring sheet.

[0027] In one embodiment, the top surface of the first protrusion and / or the bottom surface of the second protrusion are provided with protrusions or corrugations.

[0028] In one embodiment, the top surface of the frame is provided with a recessed area;

[0029] The top end of the avoidance through hole is connected to the recessed area;

[0030] The upper spring sheet includes a connecting portion, which is located at the top of the recessed area and connected to the supporting rod.

[0031] In one embodiment, the connecting portion comprises two N-shaped segments connected to each other;

[0032] The support rod is connected to the connecting parts of the two N-shaped segments.

[0033] The base of the utility model is provided with a first protrusion, and the frame is provided with four first grooves for accommodating the first protrusion. The damping rubber is arranged between the first protrusion and the top wall of the first groove, which can reduce the distance between the frame and the base, and the first protrusion can also limit the range of radial movement of the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1-Figure 3 The invention discloses a lens driving mechanism according to an embodiment of the present invention.

[0035] Figure 4 yes Figure 1 Assembly diagram of the frame, carrier and lower spring in the illustrated embodiment.

[0036] Figure 5 and Figure 6 yes Figure 1 A perspective view of the frame in the illustrated embodiment.

[0037] Figure 7 yes Figure 1 An assembly diagram of the base, the first protrusion and the support rod in the illustrated embodiment.

[0038] Reference numerals: 100, lens driving mechanism; 1, base; 11, first protrusion; 12, protrusion strip; 2, frame; 21, first groove; 22, second groove; 23, third groove; 24, avoidance through hole; 25, recessed area; 26, magnet strip; 27, second protrusion; 3, carrier; 4, upper spring sheet; 41, connecting portion; 42, N-shaped segment; 5, lower spring sheet; 6, circuit board; 7, housing; 8, support rod; DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0040] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, ie, should be interpreted as "including, but not limited to."

[0041] The following will be combined with the accompanying drawings to describe the various embodiments of the present invention in detail, so as to more clearly understand the purpose, characteristics and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0042] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0043] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0044] In the following description, in order to clearly demonstrate the structure and working mode of the utility model, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0045] The utility model relates to a lens driving mechanism 100, such as Figure 1-3 As shown, the lens driving mechanism 100 includes a base 1, a frame 2, a carrier 3, an upper spring 4, a lower spring 5, four support rods 8 and a housing 7. The housing 7 is connected to the base 1 and forms a receiving space for receiving the frame 2, the carrier 3, the upper spring 4, the lower spring 5 and the four support rods 8. The base 1 is a rectangular plate and has a built-in circuit inside. A circuit board 6 is stacked on the top surface of the base 1, and the circuit board 6 is electrically connected to the built-in circuit in the base 1.

[0046] The frame 2 is annular and extends around a vertical axis and is suspended above the base 1, and is connected to the base 1 through four support rods 8. Specifically, the bottom ends of the four support rods 8 are respectively located at the four corners of the base 1 and are respectively connected to the base 1, and the top ends are connected to the frame 2 so that the frame 2 is suspended above the base 1. The support rods 8 have a certain elasticity and hardness, and can support the frame 2. After the frame 2 moves in the horizontal direction, the support rods 8 can also drive the frame 2 to reset. It should be understood that in other embodiments, the top ends of the support rods 8 can also be directly connected to the frame 2, and do not need to be connected to the frame 2 through the upper spring 4.

[0047] The frame 2 is provided with a plurality of magnet strips 26 .

[0048] The carrier 3 is also annular and is located inside the ring of the frame 2. The carrier 3 is used to mount the lens. A first coil is wound around the outside of the carrier 3. The first coil cooperates with the magnet bar 26 on the frame 2 to drive the carrier 3 to move along the optical axis of the lens, that is, vertically, to adjust the focal length.

[0049] The upper spring leaf 4 and the lower spring leaf 5 are both elastic, the upper spring leaf 4 is located at the top of the frame 2 and the carrier 3, and the lower spring leaf 5 is located at the bottom of the frame 2 and the carrier 3. The upper spring leaf 4 and the lower spring leaf 5 are respectively connected to the frame 2 and the carrier 3. After the carrier 3 moves, the upper spring leaf 4 and the lower spring leaf 5 can drive the carrier 3 to reset.

[0050] In addition, the support rod 8 can also conduct electricity and be electrically connected to the built-in circuit of the base 1, and to the upper spring leaf 4, and the upper spring leaf 4 is also electrically connected to the first coil. After the built-in circuit of the base 1 is connected to an external power supply, it can power the first coil.

[0051] A second coil is also provided in the circuit board 6. The second coil cooperates with the magnet bar 26 to drive the frame 2 to move in the first direction or the second direction to prevent the lens from shaking. The first direction and the second direction are perpendicular to the optical axis direction of the lens. The first direction and the second direction are two horizontal directions perpendicular to each other, and the optical axis direction extends in the vertical direction.

[0052] The top surface of the base 1 is provided with four first protrusions 11, and the four first protrusions 11 are respectively located at the four corners of the base 1, and the bottom surface of the frame 2 is provided with a first groove 21 for accommodating each of the first protrusions 11 respectively, and damping glue is provided between the top wall of the first groove 21 and the first protrusion 11.

[0053] In the prior art, the damping glue is arranged between the base 1 and the frame 2, which increases the distance between the frame 2 and the base 1, and further increases the overall height of the lens driving mechanism 100, which is not conducive to the lightweight design of the electronic device. In addition, the carrier 3 moves in the vertical direction in the frame 2 to adjust the focal length, and in order to ensure the focusing distance of the carrier 3, that is, the movement space of the carrier 3 in the vertical direction, the thickness of the frame 2 in the vertical direction cannot be changed too much, so in order to reduce the overall height of the lens driving mechanism 100 in the vertical direction, it is necessary to minimize the distance between other components, so it is very important to reduce the distance between the frame 2 and the base 1.

[0054] In the utility model, the base 1 is provided with four first protrusions 11, and the frame 2 is provided with four first grooves 21 for accommodating the first protrusions 11. The damping glue is arranged between the first protrusions 11 and the top walls of the first grooves 21. The depth of the first grooves 21 and the height of the first protrusions 11 can determine the distance between the base 1 and the frame 2. That is, the damping glue is arranged between the first protrusions 11 and the top walls of the first grooves 21, which can reduce the distance between the frame 2 and the base 1, and the first protrusions 11 can also limit the range of radial movement of the frame 2.

[0055] Optionally, in other embodiments, the first protrusion 11 may also be disposed at the side edge of the base 1, and the number of the first protrusions 11 is preferably greater than or equal to three, which can ensure the stability of the frame 2. Of course, due to the effect of the support rod 8, one or two first protrusions 11 may also be provided, for example, two first protrusions 11 are symmetrically disposed relative to the center of the base 1.

[0056] Preferably, a convex strip 12 is provided on the top surface of the first protrusion 11, and the convex strip 12 extends along a portion of the radial inner edge of the first protrusion 11. A second protrusion 27 is provided on the top wall of the first groove 21, and the bottom surface of the second protrusion 27 is located in the convex strip 12. The damping glue is located in the convex strip 12 and between the second protrusion 27 and the first protrusion 11.

[0057] exist Figure 7 In the illustrated embodiment, the convex strip 12 extends along the radial inner edge of the first protrusion 11 to form an arc-shaped strip, that is, the convex strip 12 is open to the outside, which facilitates the glue coating operation and can also be used to limit the damping glue from overflowing from the inside during the glue coating process.

[0058] Furthermore, a second groove 22 is provided on the radial outer side of the second protrusion 27, and the second groove 22 is formed by the bottom surface of the second protrusion 27 being recessed to the top wall of the first groove 21. When too much glue of the damping glue is applied, a certain amount of excess glue overflows from the end surface of the second protrusion 27 to the position of the second groove 22, which will not affect the outer diameter of the entire frame 2, thereby avoiding collision between the frame 2 and the shell 7. If the outer diameter of the second protrusion 27 is designed to be flush with the side wall of the frame 2, a rubber block protrusion structure will be formed on the outer side of the end corner position of the frame 2 after the glue overflows and solidifies, which is easy to collide with the shell 7 when the frame 2 performs OIS movement.

[0059] Furthermore, the top wall of the first groove 21 is provided with a third groove 23, and the third groove 23 is located on the top surface of the second groove 22. The third groove 23 is connected to the second groove 22, and when the damping glue overflows during the gluing process, it can flow from the second groove 22 into the third groove 23 to prevent it from flowing into the frame 2. In addition, the radial inner edge of the second protrusion 27 can also be provided with a convex strip 12 to prevent the glue from flowing into the first groove 21 during the gluing process.

[0060] The first protrusion 11 is located at the edge of the base 1, and the support rod 8 is located radially inside the first protrusion 11. This prevents the support rod 8 from touching the housing 7. "Radial" refers to multiple horizontal directions radiating from the axis of the frame 2 as the center, which are perpendicular to the vertical direction.

[0061] Furthermore, a relief hole 24 is provided on the top wall of the first groove 21, and the relief hole 24 extends to the top surface of the frame 2 and is located radially inward of the second protrusion 27. The top end of the support rod 8 passes through the relief hole 24 and is connected to the upper spring sheet 4. Figure 7 In the illustrated embodiment, the first grooves 21 are located at the four corners of the frame 2 and are formed by a radially outer recess of the frame 2, that is, the first grooves 21 are open toward the radially outer side of the frame 2, and the second protrusions 27 are closer to the radially outer side relative to the avoidance through-holes 24, that is, the avoidance through-holes 24 are closer to the center of the frame 2. The bottom ends of the four support rods 8 are respectively connected to the four corners of the base 1, and the top ends respectively pass through the avoidance through-holes 24 of the four first grooves 21 and are connected to the upper spring 4. The four support rods 8 are closer to the center of the base 1 relative to the first protrusions 11, that is, the first protrusions 11 are closer to the radially outer side of the base 1.

[0062] Optionally, a fourth groove is provided on the radial outer edge of the first protrusion 11, and the fourth groove is formed by the depression of the top surface of the first protrusion 11 and extends to the top surface of the base 1. The fourth groove is formed by the depression of the outer side of the first protrusion 11 away from the center of the base 1, that is, it is located on the side of the first protrusion 11 away from the convex strip 12. During the gluing process, if there is too much glue, the glue overflows from the fourth groove, and the convex strip 12 can prevent the damping glue from overflowing into the base 1.

[0063] Optionally, a recessed area 25 is provided on the top surface of the frame 2, and the recessed area 25 is located above the first groove 21, and the top of the avoidance through hole 24 is connected to the recessed area 25. The upper spring leaf 4 is located at the top of the frame 2 and is provided with a connecting portion 41, and the connecting portion 41 is located at the top of the recessed area 25 and connected to the support rod 8. When the frame 2 moves, the upper spring leaf 4 will be pulled to deform, and the support rod 8 will also move, and the support rod 8 will also drive the connecting portion 41 to move, and the recessed area 25 is used to avoid the movement of the connecting portion 41.

[0064] Further, the connecting portion 41 includes two N-shaped segments 42 connected to each other. The support rod 8 is connected to the connecting portions 41 of the two N-shaped segments 42. The connecting portion 41 includes two symmetrically arranged N-shaped segments 42, which are arranged in an N shape and connected to each other in an M shape. The opening of the M shape and the opening of the N shape are both arranged toward the center of the frame 2, and the connection point of the two N-shaped segments 42 is the center thereof, which is connected to the support rod 8, which helps to drive the support rod 8 to reset after movement.

[0065] In addition, the top surface of the first protrusion 11 or the bottom surface of the second protrusion 27 is also corrugated or convex to increase the friction between the damping rubber, or the top surface of the first protrusion 11 and the bottom surface of the second protrusion 27 are respectively provided with corrugations or convexities to increase the friction between the damping rubber. Accordingly, when connected, the second protrusion 27 at the bottom end of the frame 2 can either contact the damping rubber applied to the first protrusion 11 through the bottom end surface, or a part of the bottom end of the second protrusion 27 can be inserted into the damping rubber, for example, a boss is integrally formed at the bottom end of the second protrusion 27 to be inserted into the damping rubber.

[0066] Preferred embodiments of the present invention have been described in detail above, but it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide further embodiments.

[0067] These and other changes can be made to the embodiments in light of the above detailed description.In general, in the claims, the terms used should not be considered limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which these claims are entitled.

[0068] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A lens driving mechanism, characterized in that: include: A base, wherein a first protrusion is provided on a top surface of the base; A plurality of support rods, wherein the bottom ends of the plurality of support rods are respectively connected to the base; a frame, the frame being located above the base and connected to the top end of the support rod, the frame being configured to be movable in a horizontal direction, the bottom surface of the frame being provided with a first groove for accommodating the first protrusion, and a damping rubber being provided between the top wall of the first groove and the first protrusion; and A carrier is located in the frame and elastically connected to the frame and is configured to be movable in a vertical direction, and is used for mounting a lens.

2. The lens driving mechanism according to claim 1, characterized in that: A convex strip is provided on the top surface of the first convex block, and the convex strip extends along a portion of the radial inner edge of the first convex block; A second convex block is disposed on the top wall of the first groove, and a bottom surface of the second convex block is located inside the convex strip; The damping glue is located in the convex strip and between the second convex block and the first convex block.

3. The lens driving mechanism according to claim 2, characterized in that: A second groove is provided on the radial outer side of the second protrusion, and the second groove is formed by the bottom surface of the second protrusion being sunken to the top wall of the first groove.

4. The lens driving mechanism according to claim 3, characterized in that: A third groove is disposed on the top wall of the first groove, and the third groove is located on the top surface of the second groove.

5. The lens driving mechanism according to claim 2, characterized in that: The first protrusion is located at the edge of the base, and the support rod is located radially inside the first protrusion.

6. The lens driving mechanism according to claim 5, characterized in that: The lens driving mechanism also includes: an upper spring sheet connected to the frame and the top of the carrier; and A lower spring sheet connected to the frame and the bottom of the carrier; The top wall of the first groove is provided with an avoidance through hole, the avoidance through hole extends to the top surface of the frame and is located radially inward of the second protrusion; The top end of the support rod passes through the avoidance through hole and is connected to the upper spring sheet.

7. The lens driving mechanism according to claim 6, characterized in that: The four first protrusions are respectively located at four corners of the base; The four first grooves are located at four corners of the frame and open toward the radial outside of the frame; The convex strip extends along the radial inner edge of the first convex block; The bottom ends of the four support rods are respectively connected to the base, and the top ends respectively pass through the avoidance through holes of the four first grooves and are connected to the upper spring sheet.

8. The lens driving mechanism according to claim 2, characterized in that: The top surface of the first convex block and / or the bottom surface of the second convex block are provided with protrusions or corrugations.

9. The lens driving mechanism according to claim 6, characterized in that: The top surface of the frame is provided with a recessed area; The top end of the avoidance through hole is connected to the recessed area; The upper spring sheet includes a connecting portion, which is located at the top of the recessed area and connected to the supporting rod.

10. The lens driving mechanism according to claim 9, characterized in that: The connecting portion includes two N-shaped segments connected to each other; The support rod is connected to the connecting parts of the two N-shaped segments.

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