A resistance welding structure, a lens driving device and a camera module

Abstract

A resistance welding structure includes metal parts and plastic parts fixed by resistance welding. The metal parts are provided with welding parts in the welding areas welded to the plastic parts. There is a gap between the welding parts and the adjacent areas around them, and the welding parts and the adjacent areas around them are connected by at least one metal bridge. The present invention also provides a lens driving device and a camera module. The resistance welding structure, lens driving device and camera module provided by the present invention can reduce the heat attenuation of the welding parts to the surroundings by setting a gap between the welding parts and the adjacent areas around them, improve the welding effect, and can reduce the heat transfer of the welding parts to the edges of the shrapnel, so as to avoid burning the plastic parts, thereby protecting the appearance of the plastic parts.

Description

Technical Field

[0001] The present invention relates to the field of imaging technology, and particularly to a resistance welding structure, a lens driving device and a camera module. Background Art

[0002] With the progress of science and technology, camera modules are more and more widely used. At present, in addition to cameras, camera modules are equipped on electronic devices such as mobile phones and computers to facilitate people to take pictures anytime and anywhere, bringing convenience and fun to people's lives. The camera module includes a fixed focus (FF) camera module and an autofocus (AF) camera module. In the autofocus (AF) camera module, the lens can be driven to move by a lens driving device (motor) to achieve focusing.

[0003] The lens driving device generally includes structures such as a base, a shrapnel, a carrier, a coil and a housing. The shrapnel is fixed on the carrier and restricts the movement of the carrier in the vertical direction by cooperating with the coil.

[0004] There can be various different fixing methods between the shrapnel and the carrier, such as resistance welding. At present, during resistance welding, the metal to be welded (shrapnel) is directly abutted against a plastic carrier with a lower melting point. Because the melting point of the plastic carrier is low, the plastic around the solder joint will melt during welding, resulting in poor appearance and insufficient welding strength, which cannot meet the high-precision and high-reliability requirements of the lens driving device.

[0005] The foregoing description is for providing general background information and does not necessarily constitute prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a resistance welding structure, a lens driving device and a camera module that can improve the welding effect.

[0007] The present invention provides a resistance welding structure, including a metal part and a plastic part fixed by resistance welding. The metal part is provided with a welding part in the welding area where it is welded to the plastic part. There is a gap between the welding part and the adjacent areas around it, and the welding part and the adjacent areas around it are connected by at least one metal bridge.

[0008] Further, the welding part is rectangular, and there are four metal bridges, which are respectively connected to the four sides of the welding part.

[0009] Further, a connecting piece for further fixing the metal part and the plastic part is provided in the gap.

[0010] Further, the plastic part is provided with a boss in the welding area where it is welded to the metal part, and the metal part is connected by the melt generated by the melting of the boss during welding.

[0011] Further, the plastic part is provided with a groove at the position of the boss, the groove corresponds to the welding part, the boss is located in the groove, and the melt generated by the melting of the boss during welding fills into the groove.

[0012] The present invention also provides a lens driving device, including a carrier and a metal shrapnel fixed on the carrier. The carrier and the metal shrapnel are fixed by resistance welding. The metal shrapnel is provided with a welding part in the welding area welded to the carrier. There is a gap between the welding part and the adjacent areas around it, and the welding part and the adjacent areas around it are connected by at least one metal bridge.

[0013] Further, the welding part is rectangular, and there are four metal bridges, which are respectively connected to the four sides of the welding part.

[0014] Further, a connecting piece for further fixing the metal shrapnel and the carrier is provided in the gap.

[0015] Further, the carrier is provided with a boss in the welding area welded to the metal shrapnel, and the metal shrapnel is connected by the melt generated by the melting of the boss during welding.

[0016] Further, the carrier is provided with a groove at the position of the boss, the groove corresponds to the welding part, the boss is located in the groove, and the melt generated by the melting of the boss during welding fills into the groove.

[0017] The present invention also provides a camera module, including the lens driving device as described above.

[0018] For the resistance welding structure, lens driving device and camera module provided by the present invention, by setting a gap between the welding part and the adjacent areas around it, the heat attenuation of the welding part to the surrounding can be reduced, the welding effect can be improved, and the heat transfer of the welding part to the edge of the shrapnel can be reduced to avoid burning the plastic part, thereby protecting the appearance of the plastic part. Description of the Drawings

[0019] Figure 1 It is a top view schematic diagram of a metal part in the resistance welding structure of an embodiment of the present invention.

[0020] Figure 2 is Figure 1 The front view schematic diagram of the shown metal part.

[0021] Figure 3 It is a top view schematic diagram of a plastic part in the resistance welding structure of an embodiment of the present invention.

[0022] Figure 4 is Figure 3 The front view schematic diagram of the shown plastic part.

[0023] Figure 5 This is a top view schematic diagram of the resistance welding structure before welding in the embodiment of the present invention.

[0024] Figure 6 It is Figure 5 the front view schematic diagram of the resistance welding structure shown before welding.

[0025] Figure 7 It is Figure 5 the front view schematic diagram of the resistance welding structure shown after welding. Specific Embodiments

[0026] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0027] As Figures 1 to 7 shown, in this embodiment, a resistance welding structure includes a metal part 1 and a plastic part 2 fixed by resistance welding.

[0028] As Figure 1 , Figure 2 shown, in the welding area where the metal part 1 is welded to the plastic part 2, a welding portion 11 is provided. A gap 12 is provided between the welding portion 11 and its adjacent surrounding areas, and the welding portion 11 and the adjacent surrounding areas are connected by at least one metal bridge 13. In this embodiment, the welding portion 11 is rectangular, and there are four metal bridges 13, which are respectively connected to the four sides of the welding portion 11. The main function of the metal bridge 13 is to connect the welding portion 11 to the adjacent surrounding areas through the welding portion 11 and fix the welding portion 11 on the metal part 1.

[0029] In this embodiment of the resistance welding structure, by providing a gap 12 between the welding portion 11 and its adjacent surrounding areas, the heat attenuation of the welding portion 11 to the surrounding can be reduced, the welding effect can be improved, and the heat transfer of the welding portion 11 to the edge of the metal part can be reduced to avoid burning the plastic part 2, thereby protecting the appearance of the plastic part 2. In this embodiment, the welding portion 11 is rectangular, and there are four metal bridges 13, which are respectively connected to the four sides of the welding portion 11. This structure makes the welding portion 11 firmly fixed, and has a simple structure and convenient processing. Of course, in other embodiments, according to needs, the welding portion 11 can adopt other shapes, and the number of metal bridges 13 can also be set differently and other structures can be adopted.

[0030] In this embodiment, a connecting member (not shown) for further fixing the metal part 1 and the plastic part 2 is also provided in the gap 12, thereby increasing the connection strength between the metal part 1 and the plastic part 2. The connecting member can be formed by applying glue in the gap 12 and curing after welding.

[0031] As Figure 3 ,Figure 4 As shown, in this embodiment, the plastic part 2 is provided with a groove 21 at a position corresponding to the welding part 11. A boss 22 is arranged in the groove 21. During welding, the melted material 23 generated by the melting of the boss 22 fills into the groove 21 and connects the metal part 1, realizing the welding and fixing of the metal part 1 and the plastic part 2. In this embodiment, the melted material 23 generated by the melting of the boss 22 is used to connect the metal part 1, which can avoid the contact between the adjacent areas around the welding part 11 on the metal part 1 and the plastic part 2, causing the non-welding areas around the plastic part 2 to melt and burn due to high temperature, resulting in the serious consequences that the whole metal part 1 sinks downward and the overall appearance is poor.

[0032] In this embodiment, the groove 21 can limit the flow of the melted material 23, so that the melted material 23 is controlled in the groove 21 corresponding to the welding part 11 of the metal part 1 to obtain the best welding effect. Of course, in other embodiments, the groove 21 may not be provided, and the boss 22 may be directly arranged on the plastic part 2, and the flow of the melted material 23 is controlled by the surface tension of the melted material 23.

[0033] Of course, in other embodiments, the plastic part 2 may adopt other structures, such as the existing structure without protrusions and grooves.

[0034] The present invention also provides an embodiment of a lens driving device. The lens driving device includes a carrier and a metal elastic sheet fixed on the carrier, and the carrier and the metal elastic sheet are welded and fixed by resistance welding. The lens driving device in this embodiment adopts the above-mentioned resistance welding structure, with the carrier as the plastic part of the resistance welding structure and the metal elastic sheet as the metal part of the resistance welding structure. The structures and connection relationships of the carrier and the metal elastic sheet are the same as those of the plastic part and the metal part of the above-mentioned resistance welding structure, and will not be elaborated here.

[0035] The present invention also provides an embodiment of a camera module, and the camera module includes the lens driving device as described above.

[0036] In this article, the orientation or regional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. are based on the orientation or regional relationships shown in the drawings, and are only for the convenience of clearly expressing the technical solution and description, and therefore cannot be understood as a limitation to the present invention.

[0037] In this article, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to the listed elements, it may also include other elements not explicitly listed.

[0038] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described.

Claims

1. A resistance welding structure, comprising a metal part and a plastic part fixed by resistance welding. Characterized in that, The metal part is provided with a welding portion in the welding area where it is welded to the plastic part. There is a gap between the welding portion and its adjacent surrounding areas, and the welding portion and the adjacent surrounding areas are connected by at least one metal bridge. The plastic part is provided with a boss in the welding area where it is welded to the metal part, and the melted material generated by the melting of the boss during welding connects the metal part.

2. The resistance welding structure according to claim 1, Characterized in that, The welding portion is rectangular, and there are four metal bridges, which are respectively connected to the four sides of the welding portion.

3. The resistance welding structure according to claim 1, Characterized in that, A connecting piece for further fixing the metal part and the plastic part is provided in the gap.

4. The resistance welding structure according to claim 1, Characterized in that, The plastic part is provided with a groove at the position of the boss. The groove corresponds to the welding portion, and the boss is located in the groove. The melted material generated by the melting of the boss during welding fills into the groove.

5. A lens driving device, comprising a carrier and a metal shrapnel fixed on the carrier, Characterized in that, The carrier and the metal shrapnel are fixed by resistance welding. The metal shrapnel is provided with a welding portion in the welding area where it is welded to the carrier. There is a gap between the welding portion and its adjacent surrounding areas, and the welding portion and the adjacent surrounding areas are connected by at least one metal bridge.

6. The lens driving device according to claim 5, Characterized in that, The welding portion is rectangular, and there are four metal bridges, which are respectively connected to the four sides of the welding portion.

7. The lens driving device according to claim 5, Characterized in that, A connecting piece for further fixing the metal shrapnel and the carrier is provided in the gap.

8. The lens driving device according to claim 5, Characterized in that, The carrier is provided with a boss in the welding area where it is welded to the metal shrapnel, and the melted material generated by the melting of the boss during welding connects the metal shrapnel.

9. The lens driving device according to claim 8, Characterized in that, The carrier is provided with a groove at the position of the boss. The groove corresponds to the welding portion, and the boss is located in the groove. The melted material generated by the melting of the boss during welding fills into the groove.

10. A camera module, Characterized in that, It includes the lens driving device according to any one of claims 5 to 9.

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