Lens driving mechanism

Abstract

The utility model discloses a lens driving mechanism, which comprises a base, a frame, a carrier, an elastic piece and a plurality of supporting reeds, and the frame is suspended above the base. The carrier is connected with the frame and can move in the vertical direction. And the elastic piece is elastically connected with the frame and the carrier. The supporting reeds comprise bent reed wires, the bottom ends of the supporting reeds are connected with the base, and the top ends of the supporting reeds are connected with the elastic piece.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical element drive technical field, especially relate to a lens drive mechanism. BACKGROUND

[0002] With the development of science and technology, nowadays many electronic devices (for example, smart mobile phone or digital camera) all have the function of taking pictures or recording videos. These electronic devices are more and more popular, and develop towards the direction of convenience and thinning, to provide users with more choices.

[0003] Some electronic devices with photographing or video recording function are provided with a lens driving device to drive the optical components of the lens to move, thereby achieving the functions of automatic focusing and optical anti-shake.

[0004] In the prior art, an upper spring sheet is connected between the top end of the frame and the top end of the carrier, and a lower spring sheet is connected between the bottom end of the frame and the bottom end of the carrier. The upper spring sheet and the lower spring sheet are used for reset operation of the carrier, and the upper spring sheet is also used for connection of the suspension wire and the carrier and transmission of current. The frame is connected with the base through the suspension wire and is completely supported by the elastic sheet, so that the frame and the carrier are in a suspended state.

[0005] The suspension wire is rod-shaped, has weak elasticity, strong rigidity, is easy to be broken due to overwork, and does not meet the market requirements. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a lens drive mechanism to solve the problems in the prior art.

[0007] To solve the above technical problems, the embodiment of the utility model provides a lens drive mechanism, which comprises:

[0008] a base;

[0009] a frame, which is suspended above the base;

[0010] a carrier, which is connected with the frame and is arranged to be movable in the vertical direction;

[0011] an elastic member, which is elastically connected with the frame and the carrier;

[0012] a plurality of support spring sheets, which comprise curved spring wires, the bottom ends of the support spring sheets are connected with the base, and the top ends of the support spring sheets are connected with the elastic member.

[0013] In one embodiment, the bottom surface of the plurality of support spring sheets is attached to the outer side wall of the base, and the top end is attached to the radial outer side wall of the frame.

[0014] In one embodiment, the base includes a base plate and a plurality of mounting protrusions, the plurality of mounting protrusions being located at the top edge of the base;

[0015] The bottom end of the support spring is connected to the outer wall of the mounting protrusion.

[0016] In one embodiment, the base plate is rectangular;

[0017] The four mounting protrusions are respectively located at the four corners of the base plate;

[0018] At least four of the support springs are respectively connected to the four mounting protrusions.

[0019] In one embodiment, every two of the support springs are abutted against the two adjacent outer sidewalls of one of the mounting protrusions.

[0020] In one embodiment, the elastic element includes an upper spring and a lower spring, the upper spring being located at the top of the frame and elastically connected to the frame and the carrier, and the lower spring being located at the bottom of the frame and elastically connected to the frame and the carrier.

[0021] The top end of the support spring is connected to the upper spring.

[0022] In one embodiment, the base further includes built-in wiring located within the base plate and electrically connected to the support spring.

[0023] The carrier is provided with a coil assembly, which is electrically connected to the upper spring plate;

[0024] The frame is equipped with a magnet group, which, in conjunction with the coil group, can drive the carrier to move in the vertical direction.

[0025] In one embodiment, the lens driving mechanism further includes:

[0026] A first electrode plate, which is connected to the carrier;

[0027] A first sensing plate is connected to the frame and is positioned opposite to the first electrode plate to form a sensing capacitor, used to sense the position of the carrier.

[0028] A first metal frame, located within the carrier and electrically connected to the first electrode plate and the upper spring; and

[0029] A second metal frame is located within the frame and is electrically connected to the first induction plate.

[0030] In one embodiment, the top surface of the frame is provided with a groove;

[0031] The two first sensing plates are attached to the inner wall of the groove;

[0032] The top end of the first electrode plate is connected to the carrier, and the bottom end extends into the groove.

[0033] In one embodiment, the lens driving mechanism further includes:

[0034] The second electrode plate is connected to the bottom surface of the frame;

[0035] The second sensing plate is connected to the circuit board and is positioned opposite the first electrode plate to form another sensing capacitor, which is used to sense the position of the frame. Attached Figure Description

[0036] Figure 1 , Figure 2 and Figure 3 This is an exploded view of the lens driving mechanism according to one embodiment of the present invention.

[0037] Figure 4 yes Figure 1 The assembly diagram of the frame, carrier, and multiple supporting springs in the illustrated embodiment is shown.

[0038] Figure 5 and Figure 6 yes Figure 1 Exploded view of the base in the illustrated embodiment.

[0039] Figure 7 yes Figure 1 Exploded view of the frame and carrier in the illustrated embodiment.

[0040] Figure 8 and Figure 9 This is a perspective view of a first metal frame, a second metal frame, an AF coil group, a first electrode plate, and a first induction plate, according to an embodiment of this utility model.

[0041] Figure 10 This is a cross-sectional view of a lens driving mechanism according to an embodiment of the present invention.

[0042] Reference numerals: 10. Lens drive mechanism; 1. Base; 11. Base plate; 12. Mounting protrusion; 13. Clearance groove; 2. Frame; 21. Magnet assembly; 22. Second metal frame; 23. First sensing plate; 24. Second electrode plate; 25. Groove; 26. Metal protective sheet; 3. Carrier; 31. AF coil assembly; 32. First metal frame; 33. First electrode plate; 4. Upper spring; 5. Lower spring; 6. Supporting spring; 7. Circuit board; 71. Second sensing plate; 72. Sensing chip; 8. Housing. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0044] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0045] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of this utility model. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of this utility model, but are merely illustrative of the essential spirit of the technical solution of this utility model.

[0046] Throughout this specification, references to "an 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. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0047] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0048] In the following description, in order to clearly demonstrate the structure and working method of this utility model, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0049] This utility model relates to a lens driving mechanism 10, including a housing 8, a frame 2, a magnet assembly 21, an elastic element, a carrier 3, a circuit board 7, multiple supporting springs 6, and a base 1. The housing 8 and base 1, when fastened together, form a hollow cavity. The frame 2 is located within the hollow cavity and suspended above the base 1. The magnet assembly 21 is installed inside the frame 2, and the carrier 3 is installed within a ring of the frame 2. An OIS coil is installed inside the circuit board 7. Under the action of the OIS coil and the magnet assembly 21, the frame 2, along with the magnet assembly 21 and the carrier 3, moves along the X and Y axes within the hollow cavity. An AF coil assembly 31 is installed on the outside of the carrier 3. Under the action of the AF coil assembly 31 and the magnet assembly 21, the carrier 3 moves relative to the frame 2 along the Z axis (vertical direction). The lens is installed inside the carrier 3 and can move along the Z axis with the carrier 3, thus realizing three-axis movement of the lens.

[0050] The elastic element includes an upper spring plate 4 and a lower spring plate 5, which are used for the reset operation of the carrier 3. The upper spring plate 4 is located at the top of the frame 2 and is elastically connected to the frame 2 and the carrier 3, while the lower spring plate 5 is located at the bottom of the frame 2 and is elastically connected to the frame 2 and the carrier 3. After the carrier 3 moves, the elastic element can help the carrier 3 reset.

[0051] The top end of the support spring 6 is connected to the frame 2, and the bottom end is connected to the base 1. The frame 2 is connected to the base 1 through the support spring 6, and the support spring 6 completely supports the frame 2 and the carrier 3, making them suspended in the air to reduce friction during driving. At the same time, after the frame 2 is driven, the elasticity of the support spring 6 can play a certain role in resetting.

[0052] In a specific embodiment, such as Figures 1-10 As shown, the base 1 includes a base plate 11, a mounting protrusion 12 located on the top surface of the base plate 11, and built-in wiring located within the base plate 11.

[0053] The base plate 11 is rectangular, and the circuit board 7 is stacked on the top surface of the base plate 11 with clearance notches at the four corners. Four mounting protrusions 12 are connected to the top surface of the base plate 11 and are located in the four clearance notches of the circuit board 7, that is, the four mounting protrusions 12 are connected to the four corners of the base plate 11.

[0054] The built-in circuit is embedded in the base plate 11 and electrically connected to the circuit board 7. When the circuit board 7 is powered on, it supplies power to the OIS coil.

[0055] Eight support springs 6 form four pairs of support springs 6. The bottom end of each pair of support springs 6 is connected to each mounting protrusion 12, while the top end is connected to the upper spring 4.

[0056] The four pairs of support springs 6 are sheet-shaped, and the two support springs 6 of each pair are respectively attached to the two adjacent outer side walls of each mounting protrusion 12. The middle part is a bent spring wire, and the top end is connected to the upper spring 4.

[0057] In other words, the support spring 6 is not a straight rod, but a bent one. The frame 2 can be supported by increasing the diameter of the bent support spring 6, but this will not affect its elasticity. Therefore, the structure is stable and has resilience. It can also stably support the frame 2, and can repeatedly drive the frame 2 to reset. It is not easy to break and its lifespan is much longer than that of a straight rod suspension wire.

[0058] In addition, during the drive operation, the built-in circuit in the base 1 is electrically connected to the support spring 6, and the current of the built-in circuit is transmitted to the support spring 6. A part of the support spring 6 is electrically connected to the upper spring 4, which transmits the current to the upper spring 4, and then to the AF coil group 31 on the outer periphery of the carrier 3 for power supply.

[0059] It should be understood that in other embodiments, the multiple support springs 6 may also be directly connected to the top surface of the base plate 11 or abut against the radial outer side wall, without limiting the specific connection method between the support springs 6 and the base 1. If the base plate 11 is circular, multiple mounting protrusions 12 may be disposed at the edge of the base 1, and the bottom end of each support spring 6 may be connected to the radial outer side wall of each mounting protrusion 12.

[0060] In one embodiment, the lens driving mechanism 10 further includes a first electrode plate 33 and a first sensing plate 23. The first electrode plate 33 is connected to the radial outer side of the carrier 3, while the first sensing plate 23 is connected to the radial inner side of the frame 2 and is disposed opposite to the first electrode plate 33 to form a sensing capacitor. When the carrier 3 moves, the first electrode plate 33 will move with the carrier 3, thereby changing the capacitance of the sensing capacitor. The position of the carrier 3 can be determined by the change in capacitance.

[0061] Furthermore, the lens driving mechanism 10 also includes a first metal frame 32 and a second metal frame 22. The first metal frame 32 is located inside the carrier 3 and is electrically connected to the first electrode plate 33 and the upper spring 4. The AF group of the carrier 3 is also electrically connected to the first metal frame 32. When the first metal frame 32 and the upper spring 4 are energized, the first electrode plate 33 and the AF coil group 31 can be energized.

[0062] The second metal frame 22 is located inside the frame 2 and is electrically connected to the first sensing plate 23 and the other upper spring 4. That is to say, when the second metal frame 22 is powered on, it can power the first sensing plate 23.

[0063] In one embodiment, the top surface of the frame 2 has a groove 25, and two first sensing plates 23 are attached to the inner wall of the groove 25. The top end of the first electrode plate 33 is connected to the carrier 3, and the bottom end extends into the groove 25 and is positioned opposite to the two first sensing plates 23. By inserting one first electrode plate 33 between the two first sensing plates 23, the sensing accuracy can be increased, and when the carrier 3 or the frame 2 is deformed by compression, the first electrode plate 33 will not fall out of the sensing range of the first sensing plate 23, so that its sensing capacitance effect is not affected. At the same time, this design increases the distance between the first electrode plate 33 and the first sensing plate 23, reducing the reliability change when the first electrode plate 33 moves, thereby making its capacitance structure sensing more accurate.

[0064] The lens driving mechanism 10 also includes a second electrode plate 24 and a second sensing plate 71. The second electrode plate 24 is connected to the bottom surface of the frame 2 and electrically connected to the second metal frame 22. The second sensing plate 71 is connected to the circuit board 7 and is positioned opposite to the first electrode plate 33 to form another sensing capacitor. After the frame 2 moves along the X and Y axes, the capacitance value of the corresponding sensing capacitor will change. Based on this change, the X and Y axis moving positions of the frame 2 and the carrier 3 can be determined, thus achieving the effect of an X and Y axis position sensor.

[0065] Magnet groups 21 are arranged on three sides of frame 2. Correspondingly, OIS coil groups are arranged on three sides of circuit board 7. The second sensing plate 71 is positioned to avoid the OIS coil groups on circuit board 7, thus preventing the sensing plate from affecting the Lorentz force between the OIS coil groups and magnet groups 21. It also avoids the second sensing plate 71 occupying the mounting space of the OIS coil groups on circuit board 7, reducing the thickness of circuit board 7. A sensing chip 72 is located at the bottom of circuit board 7, electrically connected to the second sensing plate 71. The sensing chip 72 detects the capacitance value of the formed capacitor structure to determine the movement position of the lens in the X and Y axes. Correspondingly, a clearance groove 13 is provided on the upper surface of base 1 to avoid the sensing chip 72.

[0066] A metal protective plate 26 is embedded in the frame 2. It is located on the outside of the second metal frame 22. One end is welded to the upper spring plate 4 and energized. It can fix the potential and prevent the external electric field from affecting the sensing accuracy of the above-mentioned capacitor structure.

[0067] The preferred embodiments of the present invention have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to utilize aspects, features, and concepts from various patents, applications, and publications to provide other embodiments.

[0068] In light of the detailed description above, these and other changes can be made to the embodiments. Generally, the terminology used in the claims should not be considered limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

[0069] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them 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: Base; A frame, which is suspended above the base; A carrier, which is connected to the frame and is configured to move in a vertical direction; An elastic element, which is elastically connected to the frame and the carrier; Multiple support springs, each of which includes a bent spring wire and has its bottom end connected to the base and its top end connected to the elastic element.

2. The lens driving mechanism according to claim 1, characterized in that, The bottom surfaces of the plurality of support springs are attached to the outer side wall of the base, and the top surfaces are attached to the radial outer side wall of the frame.

3. The lens driving mechanism according to claim 2, characterized in that, The base includes a base plate and a plurality of mounting protrusions, the plurality of mounting protrusions being located at the top edge of the base; The bottom end of the support spring is connected to the outer wall of the mounting protrusion.

4. The lens driving mechanism according to claim 3, characterized in that, The base plate is rectangular in shape; The four mounting protrusions are respectively located at the four corners of the base plate; At least four of the support springs are respectively connected to the four mounting protrusions.

5. The lens driving mechanism according to claim 4, characterized in that, Each pair of the support springs is attached to the two adjacent outer sidewalls of one of the mounting protrusions.

6. The lens driving mechanism according to claim 3, characterized in that, The elastic element includes an upper spring and a lower spring. The upper spring is located at the top of the frame and is elastically connected to the frame and the carrier. The lower spring is located at the bottom of the frame and is elastically connected to the frame and the carrier. The top end of the support spring is connected to the upper spring.

7. The lens driving mechanism according to claim 6, characterized in that, The base also includes built-in wiring, which is located inside the base plate and electrically connected to the support spring. The carrier is provided with a coil assembly, which is electrically connected to the upper spring plate; The frame is equipped with a magnet assembly, which, in conjunction with the coil assembly, can drive the carrier to move in the vertical direction.

8. The lens driving mechanism according to claim 6, characterized in that, The lens driving mechanism also includes: A first electrode plate, which is connected to the carrier; A first sensing plate, connected to the frame and positioned opposite the first electrode plate to form a sensing capacitor, is used to sense the position of the carrier. A first metal frame, located within the carrier and electrically connected to the first electrode plate and the upper spring; and A second metal frame is located within the frame and is electrically connected to the first induction plate.

9. The lens driving mechanism according to claim 8, characterized in that, The top surface of the frame is provided with a groove; The two first sensing plates are attached to the inner wall of the groove; The top end of the first electrode plate is connected to the carrier, and the bottom end extends into the groove.

10. The lens driving mechanism according to claim 8, characterized in that, The lens driving mechanism also includes: The second electrode plate is connected to the bottom surface of the frame; The second sensing plate is connected to the circuit board and is positioned opposite the first electrode plate to form another sensing capacitor, which is used to sense the position of the frame.

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