Lens driving device

Abstract

The utility model belongs to optical component technology field, concretely relates to a lens drive device, including shell, base, drive mechanism and carrier, shell and base constitute hollow cavity, drive mechanism and carrier are located in the hollow cavity, drive mechanism includes the coil on the two side walls of base adjacent and the magnet on the two side walls of carrier adjacent, two magnets are respectively with two coils one -to -one opposite setting, realize carrier in base relative to base longitudinal motion under the cooperation of magnet and coil. The utility model adopts double coil drive, to increase the driving force of AF direction, makes the lens drive device obtain stable zoom purpose.

Description

Technical Field

[0001] This utility model belongs to the field of optical component technology, specifically relating to a lens driving device. Background Technology

[0002] With the development of technology, many electronic devices today (such as smartphones or digital cameras) have the function of taking pictures or recording videos. The use of these electronic devices is becoming more and more common, and they are developing towards convenient and thinner designs to provide users with more choices.

[0003] Some electronic devices with photographic or video recording capabilities are equipped with a lens drive mechanism to move optical components such as a lens, thereby achieving autofocus. Light can pass through the optical components to form an image on the photosensitive element.

[0004] With the widespread use of smartphones and other electronic devices, optimizing the lens drive mechanisms built into these devices to achieve more stable zoom and image quality is a task that those skilled in the art need to actively consider. Utility Model Content

[0005] The present invention addresses the aforementioned technical problems by providing a lens driving device.

[0006] A lens driving device includes a housing, a base, a driving mechanism, and a carrier, wherein the housing and the base form a hollow cavity, and the driving mechanism and the carrier are located within the hollow cavity.

[0007] The driving mechanism includes coils located on adjacent side walls of the base and magnets located on adjacent side walls of the carrier. The two magnets are respectively arranged opposite to the two coils. Under the combined action of the magnets and the coils, the carrier moves longitudinally relative to the base within the base.

[0008] Optionally, the base has clearance openings on its adjacent side walls, and a circuit board is fixedly connected to the outside of the two clearance openings. Two coils are provided on the inside of the circuit board, and the two coils are located in the two clearance openings respectively.

[0009] Optionally, the circuit board is an FPC board.

[0010] Optionally, the driving mechanism is divided into two sets, which are arranged diagonally opposite each other and share the same circuit board.

[0011] Optionally, a carrier guide groove is provided on the side wall of the carrier, the length direction of the carrier guide groove is longitudinal, and the carrier guide groove is located at the corner position of the carrier between two adjacent magnets;

[0012] A base guide groove is provided on the inner sidewall of the base. The length direction of the base guide groove is longitudinal, and the base guide groove is located at the corner of the base between two adjacent coils.

[0013] The lens driving device also includes a guide rod, which is located between the carrier guide groove and the base guide groove. When the carrier moves longitudinally, the guide rod guides and limits the carrier.

[0014] Optionally, each of the coils has an adsorption iron sheet fixedly connected to the circuit board on its outer side, and each adsorption iron sheet is attracted to the magnet on its inner side.

[0015] Optionally, a guide hole that communicates vertically is provided at another corner of the carrier opposite to the carrier guide groove;

[0016] The lens driving device also includes an auxiliary guide rod, the outer diameter of which is smaller than the inner diameter of the guide hole, and the auxiliary guide rod passes through the guide hole.

[0017] Optionally, the top end of the guide rod and the top end of the auxiliary guide rod are respectively fixed to the outer casing, and the bottom end of the guide rod and the bottom end of the auxiliary guide rod are respectively fixed to the base.

[0018] Optionally, when the top end of the guide rod and the top end of the auxiliary guide rod are fixed to the outer shell, and when the bottom end of the guide rod and the bottom end of the auxiliary guide rod are fixed to the base, at least one of the following fixing methods, namely, adhesive fixing and welding, is used respectively.

[0019] Optionally, the outer casing is provided with two diagonally arranged upper positioning holes, and the top end of the guide rod and the top end of the auxiliary guide rod are respectively connected to their respective upper positioning holes.

[0020] Optionally, the base is provided with two diagonally arranged lower positioning holes, and the bottom end of the guide rod and the bottom end of the auxiliary guide rod are respectively connected to their respective lower positioning holes.

[0021] Optionally, the base is provided with an internal metal for fixing, and part of the upper surface of the internal metal is exposed outside the base. The bottom end of the guide rod and the bottom end of the auxiliary guide rod are respectively welded to the internal metal.

[0022] Beneficial effects: This utility model has at least one or more of the following advantages:

[0023] 1. This utility model adopts dual coil drive to increase the driving force in the AF direction (longitudinal direction) so that the lens drive device can achieve stable zoom.

[0024] 2. In existing electronic product designs, multiple zoom lenses are sometimes required for photography, necessitating multiple drive mechanisms to operate the lenses. In this invention, the two magnets and two coils in a single drive mechanism are respectively positioned on either side of a corner of the carrier or base. Another drive mechanism can be installed on the other sides of the carrier or base. When adjacent coils in the two drive mechanisms are energized, no potential interference occurs, thus improving the zoom effect of the lens drive device.

[0025] 3. This utility model uses a guide rod to guide and limit the longitudinal movement of the carrier, which facilitates product assembly. Simultaneously, the use of double-adsorption iron plates increases the compactness of the connection structure between the carrier, base, and guide rod, ensuring its guiding effect.

[0026] 4. This utility model can prevent the carrier from deflecting at a large angle by using an auxiliary guide rod. The diameter of the guide hole is slightly larger than the outer diameter of the auxiliary guide rod to avoid the slight movement of the carrier when it comes into contact with the guide rod under the action of the adsorption iron sheet. Attached Figure Description

[0027] Figure 1 This is an exploded view of the present invention;

[0028] Figure 2 for Figure 1 Further explosion diagram;

[0029] Figure 3 for Figure 2 Further explosion diagram;

[0030] Figure 4 This is a diagram showing the positional relationship between the base and the carrier of this utility model;

[0031] Figure 5 for Figure 4 An explosion diagram;

[0032] Figure 6 for Figure 5 Further explosion diagram;

[0033] Figure 7 This is a schematic diagram of one structure of the base of this utility model;

[0034] Figure 8 This is an exploded schematic diagram of the carrier of this utility model;

[0035] Figure 9 This is a top view of the present invention;

[0036] Figure 10 for Figure 9 AA section view;

[0037] Figure 11 for Figure 9 BB cross-sectional view. Detailed Implementation

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0039] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0040] 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.

[0041] 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.

[0042] Reference Figures 1 to 11 This utility model provides a lens driving device, which includes a housing 10, a base 20, a driving mechanism, and a carrier 30. The housing 10 and the base 20 form a hollow cavity, preferably connected by a snap-fit ​​connection. The driving mechanism and the carrier 30 are located within the hollow cavity. A longitudinally communicating lens through-hole is provided in the middle of the housing 10, the base 20, the driving mechanism, and the carrier 30 along the longitudinal direction (i.e., vertical direction) to avoid or accommodate the lens. The lens is installed inside the carrier 30. Under the action of the driving mechanism, the carrier 30 and the lens move longitudinally relative to the base 20 within the hollow cavity, achieving a zoom effect.

[0043] The driving mechanism includes two coils 41 and two magnets 42. The two coils 41 are located on adjacent side walls of the base 20, and the two magnets 42 are located on adjacent side walls of the carrier 30. Each magnet 42 is positioned opposite to a single coil 41. Under the combined action of the magnets 42 and the coils 41, the magnets 42, together with the carrier 30, move longitudinally relative to the base 20 within the base 20. This invention employs a dual-coil drive to increase the driving force in the AF direction (longitudinal), enabling the lens drive device to achieve stable zooming.

[0044] In one embodiment, reference is made to Figure 8 The carrier 30 has magnet mounting grooves 31 on its adjacent side walls. The outer side of the magnet mounting groove 31 is an open structure, and the magnet 42 is installed in the magnet mounting groove 31.

[0045] In one embodiment, reference is made to Figure 3 , Figure 6 and Figure 7 The base 20 has clearance openings 21 on its adjacent side walls. A circuit board 50 is fixedly connected to the outside of the two clearance openings 21. Two coils 41 are arranged inside the circuit board, and the two coils 41 are located in the two clearance openings 21 respectively. The clearance openings 21 allow the inner side of each coil 41 to be the corresponding magnet 42.

[0046] Since the two coils 41 are located within the two clearance openings 21 on the adjacent sidewalls of the base 20, the circuit board 50 includes at least two adjacent side plates, each with a coil 41 disposed on its inner side. The circuit board 50 is preferably a horizontal L-shaped structure.

[0047] In one embodiment, the circuit board 50 is an FPC board.

[0048] In one embodiment, there are two sets of drive mechanisms, which are arranged diagonally opposite each other and share the same circuit board 50.

[0049] In this embodiment, each drive mechanism has two coils 41 and two magnets 42. The coils 41 are all disposed inside the circuit board 50, and each coil 41 is located within the clearance opening 21 of the base 20. At this time, the circuit board 50 includes at least four side plates, which are adjacent to each other in pairs.

[0050] Preferably, the base 20 is a rectangular frame structure, the carrier 30 is a rectangular structure, and the circuit board 50 is a rectangular frame structure. The carrier 30 is disposed inside the base 20, and the circuit board 50 is sleeved on the outer side wall of the base 20. A coil 41 is disposed on the inner side of each of the four side walls of the circuit board 50. The four coils 41 are respectively located in the clearance openings 21 of the four side walls of the base 20, and four magnets 42 are respectively located on the outer side of the four side walls of the carrier 30.

[0051] Of course, the base 20, carrier 30, and circuit board 50 can also have other structures. For example, the base 20 and circuit board 50 can be hexagonal frame structures, and the corresponding carrier 30 can be rectangular or hexagonal structures. When the driving mechanism of this utility model is a set, the base 20, carrier 30, and circuit board 50 each have at least two side walls. When the driving mechanism of this utility model is a set, the base 20, carrier 30, and circuit board 50 each have at least four side walls.

[0052] In existing electronic product designs, multiple zoom lenses are sometimes required for photography, necessitating multiple drive mechanisms to operate the lenses. In this invention, the two magnets 42 and two coils 41 in a single drive mechanism are respectively positioned on either side of a corner of the carrier 30 and base 20. Another drive mechanism can be installed on the other sides of the carrier 30 and base 20. When adjacent coils 41 in the two drive mechanisms are energized, no potential interference occurs, improving the zoom effect of the lens drive device.

[0053] In one embodiment, reference is made to Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 8 The carrier 30 has a carrier guide groove 32 on its side wall. The length direction of the carrier guide groove 32 is longitudinal, and the carrier guide groove 32 is located at the corner of the carrier between two adjacent magnets 42.

[0054] Reference Figure 3 , Figure 6 and Figure 7 The base 20 has a base guide groove 22 on its inner side wall. The length direction of the base guide groove 22 is longitudinal, and the base guide groove 22 is located at the corner of the base between two adjacent coils 41.

[0055] Reference Figure 4 The lens driving device also includes a guide rod 61, which is located between the carrier guide groove 32 and the base guide groove 22. The carrier guide groove 32 and the base guide groove 22 clamp and position the guide rod 61. When the carrier 30 moves longitudinally, the guide rod 61 guides and limits the carrier 30.

[0056] In one embodiment, reference is made to Figures 2 to 6 , Figure 11 Each coil 41 has an adsorption iron sheet 62 fixedly connected to the circuit board 50 on its outer side, and each adsorption iron sheet 62 is attracted to the corresponding magnet 42 on its inner side.

[0057] Since the coil 41 is positioned opposite to the corresponding magnet 42 on its inner side, the adsorption iron sheet 61 on the outer side of the coil 41 is also positioned opposite to the magnet 41 on its inner side and they attract each other. In this embodiment, by using double adsorption iron sheets 62, the compactness of the connection structure between the carrier 30, the base 20 and the guide rod 61 is increased, ensuring its guiding effect.

[0058] In one embodiment, reference is made to Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 8 A guide hole 33, which is connected vertically, is provided at the other corner of the carrier opposite the carrier guide groove 32.

[0059] Reference Figure 4 The lens driving device also includes an auxiliary guide rod 63, the outer diameter of which is smaller than the inner diameter of the guide hole 33, and the auxiliary guide rod 63 passes through the guide hole 33.

[0060] In this embodiment, the auxiliary guide rod 63 can prevent the carrier 30 from deflecting at a large angle. The diameter of the guide hole 33 is slightly larger than the outer diameter of the auxiliary guide rod 63 to avoid the slight movement of the carrier 30 when it comes into contact with the guide rod 61.

[0061] In one embodiment, the top end of the guide rod 61 and the top end of the auxiliary guide rod 63 are respectively fixed to the outer casing 10, and the bottom end of the guide rod 61 and the bottom end of the auxiliary guide rod 63 are respectively fixed to the base 20.

[0062] In one embodiment, when the top end of the guide rod 61 is fixed to the housing 10, and when the top end of the auxiliary guide rod 63 is fixed to the housing 10, at least one of the following fixing methods is used: adhesive fixing and welding.

[0063] When the bottom end of the guide rod 61 is fixed to the base 20, and when the bottom end of the auxiliary guide rod 63 is fixed to the base 20, at least one of the following fixing methods is used: adhesive fixing and welding.

[0064] In one embodiment, reference is made to Figures 1 to 3 The outer casing 10 is provided with two diagonally arranged upper positioning holes 11, and the top ends of the guide rod 61 and the auxiliary guide rod 63 are respectively connected to their respective upper positioning holes 11.

[0065] When the top end of the guide rod 61 is connected to the upper positioning hole 11, and when the top end of the auxiliary guide rod 63 is connected to the upper positioning hole 11, at least one of the following fixing methods is used: adhesive fixing and welding.

[0066] For ease of connection, the upper positioning hole 11 is preferably a through hole that connects the upper and lower parts.

[0067] At this point, the sidewalls of the outer casing 10 form a rectangular frame structure with a top portion thereon, such that the top portion has two diagonally positioned corners, and the two upper positioning holes 11 are located at these two corners respectively. Of course, the sidewalls of the outer casing 10 can also be a hexagonal frame structure or other structures, as long as the top portion of the outer casing 10 has two opposite corners for the two upper positioning holes 11 to be positioned.

[0068] In one embodiment, reference is made to Figure 3 and Figure 7 The base 20 is provided with two diagonally arranged lower positioning holes 23, and the bottom ends of the guide rod 61 and the auxiliary guide rod 63 are respectively connected to their respective lower positioning holes 23.

[0069] When the bottom end of the guide rod 61 is connected to the lower positioning hole 23, and when the bottom end of the auxiliary guide rod 63 is connected to the lower positioning hole 23, at least one of the following fixing methods is used: glue fixing and welding.

[0070] For ease of connection, the lower positioning hole 23 is preferably a through hole that connects the upper and lower parts.

[0071] At this point, the sidewalls of the base 20 form a rectangular frame structure with a bottom surface, resulting in two diagonally positioned base corners on the bottom surface. The two lower positioning holes 23 are located at these two base corners respectively. Of course, the sidewalls of the base 20 can also be hexagonal frame structures or other structures, as long as the bottom surface of the base 20 has two oppositely positioned base corners for the two lower positioning holes 23 to be installed.

[0072] In one embodiment, a built-in metal for fixing is provided inside the base 20, and part of the upper surface of the built-in metal is exposed outside the base 20. The bottom end of the guide rod 61 and the bottom end of the auxiliary guide rod 63 are respectively welded to the built-in metal.

[0073] In practice, the built-in metal welded to the bottom of the guide rod 61 and the built-in metal welded to the bottom of the auxiliary guide rod 63 can share the same built-in metal or be two separate built-in metals.

[0074] The driving mechanism in the above embodiments of this utility model adopts a moving magnet structure, that is, the coil is located on a relatively stationary base, while the magnet is located on a carrier that moves longitudinally relative to the base. This utility model can also be used in a moving coil structure, that is, by interchanged between the positions of the coil and the magnet, it can achieve the same technical effects as this utility model.

[0075] The preferred embodiments of this utility model have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to this utility model. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A lens driving device, the lens driving device comprising a housing, a base, a driving mechanism and a carrier, wherein the housing and the base form a hollow cavity, and the driving mechanism and the carrier are located within the hollow cavity; Its features are, The driving mechanism includes coils located on adjacent side walls of the base and magnets located on adjacent side walls of the carrier. The two magnets are respectively arranged opposite to the two coils. Under the combined action of the magnets and the coils, the carrier moves longitudinally relative to the base within the base.

2. The lens driving device as described in claim 1, characterized in that, The base has clearance openings on its adjacent side walls. A circuit board is fixedly connected to the outside of the two clearance openings. Two coils are arranged inside the circuit board, and the two coils are located in the two clearance openings respectively.

3. The lens driving device as described in claim 2, characterized in that, The circuit board is an FPC board.

4. The lens driving device as described in claim 2, characterized in that, The drive mechanism consists of two sets, which are arranged diagonally opposite each other and share the same circuit board.

5. The lens driving device according to any one of claims 2 to 4, characterized in that, The carrier sidewall is provided with a carrier guide groove, the length direction of the carrier guide groove is longitudinal, and the carrier guide groove is located at the corner of the carrier between two adjacent magnets; A base guide groove is provided on the inner sidewall of the base. The length direction of the base guide groove is longitudinal, and the base guide groove is located at the corner of the base between two adjacent coils. The lens driving device also includes a guide rod, which is located between the carrier guide groove and the base guide groove. When the carrier moves longitudinally, the guide rod guides and limits the carrier.

6. The lens driving device as described in claim 5, characterized in that, Each of the coils has an adsorption iron sheet fixedly connected to the circuit board on its outer side, and each adsorption iron sheet is attracted to the magnet on its inner side.

7. The lens driving device as described in claim 6, characterized in that, A guide hole with vertical communication is provided at another corner of the carrier opposite the guide groove; the lens driving device also includes an auxiliary guide rod, the outer diameter of which is smaller than the inner diameter of the guide hole, and the auxiliary guide rod passes through the guide hole.

8. The lens driving device as described in claim 7, characterized in that, The top end of the guide rod and the top end of the auxiliary guide rod are respectively fixed to the outer shell, and the bottom end of the guide rod and the bottom end of the auxiliary guide rod are respectively fixed to the base.

9. The lens driving device as described in claim 8, characterized in that, When the top end of the guide rod and the top end of the auxiliary guide rod are fixed to the outer shell, and when the bottom end of the guide rod and the bottom end of the auxiliary guide rod are fixed to the base, at least one of the following fixing methods, namely, adhesive fixing and welding, is used respectively.

10. The lens driving device as claimed in claim 9, characterized in that, The outer casing is provided with two diagonally arranged upper positioning holes, and the top end of the guide rod and the top end of the auxiliary guide rod are respectively connected to their respective upper positioning holes; And / or, the base is provided with two diagonally arranged lower positioning holes, and the bottom end of the guide rod and the bottom end of the auxiliary guide rod are respectively connected to their respective lower positioning holes; or, the base is provided with an internal metal for fixing, and part of the upper surface of the internal metal is exposed on the base, and the bottom end of the guide rod and the bottom end of the auxiliary guide rod are respectively welded to the internal metal.

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