Lens drive module

Abstract

The present invention provides a lens driving module. 【Solution means】It includes a base, a support holder provided on the base, a magnet steel assembly connected to the support holder, an OIS coil provided in a corresponding region of the base and the magnet steel assembly and electrically connected to the output point of the base, a lens barrel provided on the inner ring of the support holder, an upper spring sheet and a lower spring sheet respectively provided at the upper and lower ends of the support holder, and a suspension wire with both ends respectively connected to the upper spring sheet and the base. The lens driving module of the present invention can reduce production costs and improve the competitive advantage in terms of price of the lens driving module.

Description

Technical Field

[0001] The present invention relates to the technical field of optical devices, and particularly to a lens driving module.

Background Art

[0002] In recent years, it has been common for electronic devices to be equipped with high-performance lens driving modules. This high-performance lens driving module has an auto focusing (AF) function and an optical image stabilization (OIS) function. Here, the main role of OIS is to adjust the camera's field of view to correct the user's hand shake.

[0003] In the prior art, it is common to adopt an FPC coil (FPC COIL). However, the installation of the FPC COIL increases the production cost and reduces the competitive advantage in terms of the price of the lens driving module.

[0004] Therefore, it is necessary to provide a lens driving module that reduces the production cost and has an obvious advantage in terms of price.

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a lens driving module that reduces the production cost and has an obvious advantage in terms of price.

Means for Solving the Problems

[0006] The technical concept of the present invention is as follows.

[0007] A lens drive module, comprising a base, a support holder provided on the base, a magnet steel assembly connected to the support holder, an OIS coil provided in a region of the base corresponding to the magnet steel assembly and electrically connected to an output point of the base, a lens barrel provided on an inner ring of the support holder, an upper spring sheet and a lower spring sheet respectively provided at upper and lower ends of the support holder, and a suspension wire having both ends connected to the upper spring sheet and the base respectively.

[0008] Preferably, the magnet steel assembly includes a first magnet steel respectively provided on both opposite sides of the support holder, and a second magnet steel respectively provided on both opposite sides of the other side of the support holder. The first magnet steel includes a double magnet steel stacked along the optical axis direction of the lens barrel. The second magnet steel is a single magnet steel, and the OIS coil is an air-core coil.

[0009] Preferably, the OIS coil includes a first OIS coil installed corresponding to the first magnet steel and a second OIS coil installed corresponding to the second magnet steel.

[0010] Preferably, AF coils are respectively provided in regions of an outer wall of the lens barrel corresponding to the first magnet steel. The AF coils are connected to each other, and a winding plane of the AF coils is parallel to a plane composed of an x-axis and a z-axis.

[0011] Preferably, a magnetization direction of the double magnet steel is perpendicular to and opposite to the optical axis direction.

[0012] Preferably, a collision prevention mechanism is provided in a region of the base corresponding to an outer periphery of the OIS coil.

[0013] Preferably, the lens driving module further includes a housing connected to the base, and the housing and the base surround and form an accommodation space for accommodating the support holder, the magnet steel assembly, the lens barrel, the upper spring sheet, the lower spring sheet, and the OIS coil.

[0014] Preferably, the upper spring sheet is connected to the upper end corner region of the support holder, the lower spring sheet is connected to the lower end corner region of the support holder, the upper end of the lens barrel and the upper end corner region of the support holder are respectively provided with a first positioning post connected to the upper spring sheet, the upper spring sheet is provided with a first positioning hole aligned with the first positioning post, the lower end of the lens barrel and the lower end corner region of the support holder are respectively provided with a second positioning post connected to the lower spring sheet, the lower spring sheet is provided with a second positioning hole aligned with the second positioning post, and a suspension wire spring sheet is provided between the upper spring sheet and the upper end of the suspension wire, and at least a part of the suspension wire spring sheet overlaps with the upper spring sheet. The assembling method of the upper spring sheet includes steps of providing a soldering lug in advance on the support holder by in-mold molding, the soldering lug including a first soldering lug connected to the upper spring sheet and a second soldering lug connected to the suspension wire spring sheet; assembling the upper spring sheet; installing the first positioning post and thermally riveting the first positioning post to the support holder; and laser welding the upper spring sheet and the first soldering lug, and the suspension wire spring sheet and the second soldering lug respectively.

[0015] Preferably, the support holder is provided with mounting grooves for respectively installing the first magnet steel, the second magnet steel, and the counterweight, and a support frame connected to the first magnet steel, the second magnet steel, and the counterweight is fitted on the groove wall of the mounting groove.

[0016] Preferably, a first viscoelastic member is provided in the corner region between the lens barrel and the support holder, and a second viscoelastic member is provided between the lower end corner region of the support holder and the upper end corner region of the base.

Advantages of the Invention

[0017] The beneficial effects of the present invention are that the OIS coil in the present invention is directly electrically connected to the insert of the base. Compared with the prior art, in the lens drive module of the present invention, instead of the FPC COIL of the prior art, an air-core coil is adopted, and the OIS coil manufactured by the air-core coil is directly connected to the output point of the base, thereby reducing the manufacturing cost and enhancing the competitive advantage in terms of price of the lens drive module. The performance of the OIS coil manufactured by the air-core coil is close to or better than that of the FPC COIL of the prior art.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 7

Best Mode for Carrying Out the Invention

[0019] Hereinafter, the present invention will be further described in combination with the accompanying drawings and embodiments.

[0020] Note that all directional indications in the embodiments of the present invention, such as up, down, top, bottom, inside, outside, etc., are used only to explain the relative positional relationship between components in a specific posture, for example, as shown in the drawings. When the specific posture is changed, the directional indications also change accordingly.

[0021] When a component is said to be "fixed" or "installed" on another component, the component may be directly located on the other component, or there may be an intermediate component at the same time. When a component is said to be "connected" to another component, it may be directly connected to the other component, or there may be an intermediate component at the same time. The x-axis direction, y-axis direction, and z-axis direction described in the present invention are spatially perpendicular. Example 1

[0022] FIG. 1 is a diagram showing the lens driving module of the present invention, FIG. 2 is an exploded perspective view of the lens driving module of the present invention, FIG. 3 is an assembly schematic diagram of the magnet steel assembly. As shown in FIGS. 1 to 3, the lens driving module includes a base 1, a support holder 2 provided on the base 1, a magnet steel assembly 3 connected to the support holder 2, an OIS coil 4 provided in a region of the base 1 corresponding to the magnet steel assembly 3 and electrically connected to the output point of the base 1, a lens barrel 5 provided on the inner ring of the support holder 2, an upper spring sheet 6 and a lower spring sheet 7 respectively provided at the upper and lower ends of the support holder 2, and a suspension wire 8 having both ends connected to the upper spring sheet 6 and the base 1 respectively. The OIS coil 4 is directly spot-welded to the output end of the base 1. Specifically, an IC (integrated circuit) is provided on the base 1, the output points include out1 and out2 of the IC, and the OIS coil 4 is directly connected to out1 and out2 of the IC through an internal circuit.

[0023] The magnet steel assembly 3 includes a first magnet steel 31 respectively provided on both opposite sides of the support holder 2, and a second magnet steel 32 respectively provided on both opposite sides of the other side of the support holder 2. The first magnet steel 31 is installed parallel to the x-axis direction, and the second magnet steel 32 is installed parallel to the y-axis direction.

[0024] The first magnet steel 31 includes double magnet steel laminated along the optical axis direction of the lens barrel. The first magnet steel 31 is adhesively laminated along the optical axis direction of the lens barrel. By laminating the double magnet steel, the first magnet steel 31 drives OIS X, and at the same time, AF provides greater driving ability and better linearity. The second magnet steel 32 is single magnet steel, and the second magnet steel 32 is N-pole magnet steel. The OIS coil 4 is an air-core coil. The outer shapes of the base 1 and the support holder 2 are rectangular, and the suspension wires 8 are respectively provided in four corner regions of the base 1. The OIS coil in the present invention is directly spot-welded to the insert of the base and connected to out1 and out2 of the IC via an internal circuit. Compared with the prior art, in the lens driving module of the present invention, instead of the FPC COIL of the prior art, an air-core coil is adopted, and the OIS coil manufactured with the air-core coil is directly provided on the base, thereby reducing the manufacturing cost and enhancing the competitive advantage in terms of price of the lens driving module. The performance of the OIS coil manufactured with the air-core coil is close to or better than that of the FPC COIL of the prior art.

[0025] The OIS coil 4 includes a first OIS coil 41 installed corresponding to the first magnet steel 31 and a second OIS coil 42 installed corresponding to the second magnet steel 32. The first OIS coil 41 is installed parallel to the x-axis, and the second OIS coil 42 is installed parallel to the y-axis.

[0026] In some embodiments, a collision prevention mechanism is provided in a region corresponding to the outer periphery of the OIS coil 4 of the base 1. The collision prevention layer can be made of plastic, and the function of the collision prevention layer is to protect the OIS coil 4 to ensure its reliability and avoid problems caused by the collision of the OIS coil 4.

[0027] Figure 4 is an exploded view of the AF coil. As shown in Figure 4, AF coils 9 are respectively provided in regions of the outer wall of the lens barrel 5 corresponding to the first magnet steels 31. The AF coils 9 are connected to each other. The winding plane of the AF coil is parallel to the plane formed by the x-axis and the z-axis. The magnetization directions of the double magnet steels are perpendicular to and opposite to the optical axis direction. During use, the AF coil 9 is located in the magnetic field of the first magnet steel 31. The first magnet steel 31 drives the AF coil 9 to move along the optical axis direction of the lens barrel 5. By providing a restoring force through the upper spring sheet 6 and the lower spring sheet 7, the AF coil 9 drives the lens barrel 5 to move, realizing the autofocus (AF) function. Support columns for winding the AF coil 9 are provided on the outer wall of the lens barrel 5. During use, the OIS coil 4 is directly spot-welded and fixed to the output point of the base 1. The first OIS coil 41 is located within the magnetic field range of the nearby magnet steel and is driven to move the magnet steel along the first direction perpendicular to the optical axis direction. By providing a restoring force through the suspension wire 8, the OIS-X function for preventing camera shake in the horizontal X direction is realized. The second OIS coil 42 is located within the magnetic field range of the second magnet steel 32 and is driven to move the second magnet steel 32 along the second direction perpendicular to the optical axis direction. By providing a restoring force through the suspension wire 8, the OIS-Y function for preventing camera shake in the horizontal Y direction is realized. Figure 5 is an exploded view of the upper spring sheet, Figure 6 is an exploded view of the lower spring sheet, and Figure 7 is a diagram showing the structure of the support holder. As shown in Figures 1 to 7, the lens drive module further includes a housing 10 connected to the base 1. The housing 10 and the base 1 surround and form an accommodation space for accommodating the support holder 2, the magnet steel assembly 3, the lens barrel 5, the upper spring sheet 6, the lower spring sheet 7, and the OIS coil 4.

[0028] The upper spring sheet 6 is connected to the upper end corner region of the support holder 2, the lower spring sheet 7 is connected to the lower end corner region of the support holder 2, the upper end of the lens barrel 5 and the upper end corner region of the support holder 2 are respectively provided with first positioning posts connected to the upper spring sheet 6, the upper spring sheet 6 is provided with first positioning holes aligned with the first positioning posts, the lower end of the lens barrel 5 and the lower end corner region of the support holder 2 are respectively provided with second positioning posts connected to the lower spring sheet 7, and the lower spring sheet 7 is provided with second positioning holes aligned with the second positioning posts.

[0029] Preferably, the first positioning post is a plastic post hot riveted to the upper end of the lens barrel 5 and the upper end of the support holder 2.

[0030] A suspension wire spring sheet is provided between the upper spring sheet 6 and the upper end of the suspension wire 8, and at least a part of the suspension wire spring sheet overlaps the upper spring sheet 6.

[0031] The assembling method of the upper spring sheet 6 includes steps of: providing a soldering lug on the upper end of the support holder 2 in advance by in-mold molding, the soldering lug including a first soldering lug connected to the upper spring sheet 6 and a second soldering lug connected to the suspension wire spring sheet; assembling the upper spring sheet 6, specifically assembling the upper spring sheet 6 at the mounting positions of the upper end of the support holder 2 and the upper end of the lens barrel 5; installing the first positioning post and hot riveting the first positioning post to the support holder 2; and laser welding the upper spring sheet 6 and the first soldering lug, and the suspension wire spring sheet and the second soldering lug respectively.

[0032] The support holder 2 is provided with mounting grooves 23 for respectively installing the first magnet steel 31 and the second magnet steel 32, and a support frame 24 connected to the first magnet steel 31 and the second magnet steel 32 is fitted on the groove walls of the mounting grooves 23.

[0033] As shown in FIG. 7, in some embodiments, in order to avoid magnetic interference when the lens drive module is attached to the device body, the number of settings of the OIS coil is set to 3. Here, the number of settings of the second magnet steel 32 is 1, and a counterweight 33 is provided on the side corresponding to the second magnet steel 32. Correspondingly, the OIS coil includes two first OIS coils 41 provided corresponding to the first magnet steel 31 and one second OIS coil 42 provided corresponding to the second magnet steel 32. Further, the magnet steel assembly has a three-sided magnet steel structure, reducing the number of settings of the magnet steel and further lowering the production cost of the lens drive module.

[0034] A first viscoelastic member is provided in the corner region between the lens barrel 5 and the support holder 2, and a second viscoelastic member is provided in the lower end corner region of the support holder 2 and the upper end corner region of the base 1.

[0035] What has been described above is only one embodiment of the present invention. Those skilled in the art can make improvements without departing from the creative idea of the present invention, and these are hereby noted as being included in the protection scope of the present invention.

Claims

1. A lens drive module comprising a base, a support holder provided on the base, a magnet steel assembly connected to the support holder, an OIS coil provided in a region of the base corresponding to the magnet steel assembly and electrically connected to an output point of the base, a lens barrel provided on an inner ring of the support holder, an upper spring sheet and a lower spring sheet respectively provided at upper and lower ends of the support holder, and a suspension wire having both ends connected to the upper spring sheet and the base respectively. The lens drive module is characterized by the above.

2. The magnet steel assembly includes a first magnet steel respectively provided on both opposite sides of the support holder, and a second magnet steel respectively provided on both opposite sides of the other side of the support holder. The first magnet steel includes a double magnet steel laminated along the optical axis direction of the lens barrel. The second magnet steel is a single magnet steel, and the OIS coil is an air-core coil. The lens drive module according to claim 1, characterized by the above.

3. The OIS coil includes a first OIS coil installed corresponding to the first magnet steel, and a second OIS coil installed corresponding to the second magnet steel. The lens drive module according to claim 2, characterized by the above.

4. AF coils are respectively provided in regions of an outer wall of the lens barrel corresponding to the first magnet steel. The AF coils are connected to each other, and a winding plane of the AF coils is parallel to a plane formed by an x-axis and a z-axis. The lens drive module according to claim 2, characterized by the above.

5. The magnetization direction of the double magnet steel is perpendicular to and opposite to the optical axis direction. The lens drive module according to claim 2, characterized by the above.

6. A collision prevention mechanism is provided in a region of the base corresponding to an outer periphery of the OIS coil. The lens drive module according to claim 1, characterized by the above.

7. The lens drive module further includes a housing connected to the base. The housing and the base surround to form an accommodation space for accommodating the support holder, the magnet steel assembly, the lens barrel, the upper spring sheet, the lower spring sheet, and the OIS coil. The lens drive module according to claim 1, characterized by the above.

8. The upper spring sheet is connected to the upper end corner region of the support holder, the lower spring sheet is connected to the lower end corner region of the support holder, and the upper end of the lens barrel and the upper end corner region of the support holder are respectively provided with a first positioning post connected to the upper spring sheet. The upper spring sheet is provided with a first positioning hole that aligns with the first positioning post. The lower end of the lens barrel and the lower end corner region of the support holder are respectively provided with a second positioning post connected to the lower spring sheet. The lower spring sheet is provided with a second positioning hole that aligns with the second positioning post. A suspension wire spring sheet is provided between the upper spring sheet and the upper end of the suspension wire. At least a part of the suspension wire spring sheet overlaps the upper spring sheet. The method for assembling the upper spring sheet includes the steps of providing a soldering lug in advance on the support holder by in-mold molding, where the soldering lug includes a first soldering lug connected to the upper spring sheet and a second soldering lug connected to the suspension wire spring sheet; assembling the upper spring sheet; installing the first positioning post and thermally riveting the first positioning post to the support holder; and laser welding the upper spring sheet and the first soldering lug, and the suspension wire spring sheet and the second soldering lug respectively. The lens drive module according to claim 1, characterized in that.

9. The support holder is provided with mounting grooves for installing the first magnet steel and the second magnet steel respectively. A support frame connected to the first magnet steel and the second magnet steel is fitted on the groove wall of the mounting groove. The lens drive module according to claim 2, characterized in that.

10. A first viscoelastic member is provided in the corner region between the lens barrel and the support holder, and a second viscoelastic member is provided between the lower end corner region of the support holder and the upper end corner region of the base. The lens drive module according to claim 1, characterized in that.

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