Lens driving device base and lens driving device

Abstract

The invention relates to the technical field of optical anti-shake, in particular to a lens driving device base and a lens driving device.The lens driving device base comprises a body, a circuit layer and an OIS coil, the circuit layer is embedded in the body, the OIS coil is arranged in the body and located above the circuit layer, the OIS coil is electrically connected with the circuit layer, the body is provided with a through hole, and the through hole is communicated with the circuit layer. The through hole at least exposes part of the circuit layer; in the injection molding process of the base, the circuit layer is directly embedded in the base in advance, and the OIS coil is synchronously welded on the circuit layer and then is subjected to injection molding, so that additional parts do not need to be designed to provide protection for the coil, the condition that the OIS coil is collided to cause skin breakage is avoided on the premise that the overall thickness of the base is not increased, and the service life of the OIS coil is prolonged. And the service life of the lens driving device is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of optical image stabilization, and particularly to a base of a lens driving device and a lens driving device. Background Art

[0002] Currently, people's demand for the camera function of portable electronic devices (such as tablet computers, smartphones, etc.) is still growing rapidly. In order to meet people's diverse requirements for the imaging of the camera function, it is usually necessary to add an anti-shake motor as the driving device of the lens in the camera module to perform motion compensation on the camera module during the shooting process, so as to achieve the effect of improving the imaging quality.

[0003] At present, the anti-shake motors on the market basically adopt the driving method of coil + magnet, but in the conventional layout structure, there may be a problem that the magnet and the coil collide with each other, resulting in the coil being damaged. Chinese Patent with Publication No. CN218767525U discloses a lens driving device, which discloses that a limiting block and a wire winding block are arranged on the base to protect the coil. However, this solution undoubtedly increases the thickness of the base, resulting in an increase in the overall volume of the anti-shake motor.

[0004] It should be noted that the information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0005] In order to solve the technical problems that the base of the conventional anti-shake motor cannot provide protection for the coil or has a large thickness, the present invention provides a base of a lens driving device, which includes a body, a circuit layer, and an OIS coil. The circuit layer is buried inside the body, the OIS coil is arranged inside the body and above the circuit layer, the OIS coil is electrically connected to the circuit layer respectively, and through holes are provided on the body, and at least part of the circuit layer is exposed by the through holes.

[0006] Further, the circuit layer has a plurality of first solder joints and a plurality of second solder joints, the through holes expose the first solder joints, and the OIS coil is electrically connected to the plurality of second solder joints.

[0007] Further, the height of the first solder joints is lower than the height of the second solder joints.

[0008] Further, a heat insulation layer is coated on the OIS coil and the second solder joints.

[0009] Further, the OIS coil at least includes two relatively arranged first coils and two relatively arranged second coils. The two first coils are electrically connected to the second solder joints, and the two second coils are electrically connected to the second solder joints.

[0010] Further, the lens driving device base further includes a first IC and a second IC. The first IC and the second IC are arranged inside the body and below the circuit layer, and the first IC and the second IC are respectively electrically connected to the circuit layer.

[0011] Further, the present invention also provides a lens driving device, including the lens driving device base described in any one of the above; The lens driving device further includes an OIS frame and a lens holder. The OIS frame is movably arranged on the upper surface of the lens driving device base, the lens holder is movably arranged in the OIS frame, and the lens holder is electrically connected to the circuit layer.

[0012] Further, a plurality of magnets are provided on the OIS frame, and the plurality of magnets are distributed around the OIS frame.

[0013] Further, an AF coil is provided on the lens holder. The AF coil is sleeved on the lens holder, and the AF coil is electrically connected to the circuit layer.

[0014] Further, the lens driving device further includes a first elastic sheet, a second elastic sheet and a suspension wire. The first elastic sheet is located between the OIS frame and the lens driving device base, the first elastic sheet is respectively connected to the OIS frame and the lens holder, the second elastic sheet is arranged above the OIS frame, the second elastic sheet is respectively connected to the OIS frame and the lens holder, and the second elastic sheet is electrically connected to the third coil; Both ends of the suspension wire are electrically connected to the first solder joint and the second elastic sheet respectively.

[0015] Based on the above, for a lens driving device base and a lens driving device provided by the present invention, compared with the prior art, during the injection molding process of the base, the circuit layer is directly buried inside the base in advance, and the OIS coil is synchronously welded on the circuit layer and then injection molded. There is no need to design additional components to protect the coil. On the premise of not increasing the overall thickness of the base, the situation that the OIS coil is knocked and skinned is avoided, and the service life of the lens driving device is improved. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the following description of the positional relationship of the drawings, unless otherwise specified, the direction shown by the components in the drawings is taken as the reference.

[0017] Figure 1 Exploded structural schematic diagram of a lens driving device provided by an embodiment of the present invention; Figure 2 Exploded structural schematic diagram of a base of a lens driving device provided by an embodiment of the present invention; Figure 3 Schematic diagram of the lower surface structure of a circuit layer provided by an embodiment of the present invention; Figure 4 Schematic diagram of the structure of an OIS frame provided by an embodiment of the present invention; Figure 5 Schematic diagram of the lens holder structure provided by an embodiment of the present invention.

[0018] Reference numerals: Detailed implementation manners

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. Additionally, the term "comprising" and any variations thereof mean "including at least".

[0021] Please refer to Figure 1 and Figure 2 , Figure 1 which is an exploded structural schematic diagram of a lens driving device provided by an embodiment of the present invention; Figure 2 which is an exploded structural schematic diagram of a base of a lens driving device provided by an embodiment of the present invention.

[0022] To solve the above technical problems that the conventional anti - shake motor base cannot provide protection for the coil or has a large thickness, or to achieve at least one of the above advantages or other advantages, an embodiment of the present invention provides a base 10 of a lens driving device. As shown in the figure, the base 10 of the lens driving device includes a body 11, a circuit layer 12, and an OIS coil 13.

[0023] The circuit layer 12 and the OIS coil 13 are pre - embedded inside the body 11, and the OIS coil 13 is electrically connected to the circuit layer 12. The circuit layer 12 can be a metal circuit after stamping. The circuit layer 12 has a plurality of first solder joints 121 and second solder joints 122. An electrical connection is formed between the OIS coil 13 and the plurality of second solder joints 122. Preferably, the circuit layer 12 also has pins 123 to realize the overall circuit lead - out of the power supply and signals of the base 10 of the lens driving device.

[0024] In specific implementation, taking the direction shown in the figure as a reference, the metal circuit is stamped to form the circuit layer 12. The OIS coil 13 is fixed on the upper surface of the circuit layer 12 by means of dispensing or the like, and the OIS coil 13 is welded to the plurality of second solder joints 122. Subsequently, the circuit layer 12 and the OIS coil 13 are integrally injection - molded to form the base 10 of the lens driving device.

[0025] Since the OIS coil 13 is directly pre-embedded inside the body 11, protection for the OIS coil 13 is achieved without the need to design additional components or structures for protecting the OIS coil 13. On the premise of not increasing the thickness, the situation where the OIS coil 13 is knocked and scratched to cause skin breakage is avoided, and the service life of the lens driving device is prolonged.

[0026] Preferably, a heat insulation layer (not shown in the figure) can be coated on the OIS coil 13 and the second solder joint 122 to avoid problems such as loosening and false soldering of the solder joints between the OIS coil 13 and the second solder joint 122 caused by high temperature during the injection molding process.

[0027] Of course, the circuit layer 12 is not limited to the metal circuit formed by stamping, and a flexible board circuit can also be used instead, without limitation thereto.

[0028] Furthermore, as Figure 3 shown, the lens driving device base 10 further includes a first IC 14 and a second IC 15. The first IC 14 and the second IC 15 are pre-embedded inside the body 11 and located below the circuit layer 12. The first IC 14 and the second IC 15 are electrically connected to the circuit layer 12 respectively.

[0029] During specific implementation, the OIS coil 13 at least includes two oppositely arranged first coils 131 and two oppositely arranged second coils 132. The two first coils 131 are electrically connected to the circuit layer 12 and the first IC 14 through the second solder joint 122. The first IC 14 can control the two first coils 131 to be energized to generate a magnetic field.

[0030] The two second coils 132 are electrically connected to the circuit layer and the second IC 15 through the second solder joint 122. The second IC 15 can control the two second coils 132 to be energized to generate a magnetic field. This facilitates the normal operation of the anti-shake function.

[0031] On the basis of the above, through holes 111 can be provided on the body 11. The through holes 111 expose at least part of the circuit layer 12. Specifically, the through holes 111 expose the first solder joints 121 of the circuit layer 12. This facilitates welding during subsequent manufacturing processes and assembly processes.

[0032] Preferably, the height of the first solder joint 121 is lower than the height of the second solder joint 122 to improve strength and avoid damage.

[0033] Please combine Figure 1 refer to Figure 4 In some preferred embodiments, the present invention further provides a lens driving device, including the above-mentioned lens driving device base 10, OIS frame 20, and lens holder 30.

[0034] Taking the illustrated direction as the standard, the OIS frame 20 is movably arranged on the upper surface of the lens driving device base 10. In specific implementation, the OIS frame 20 can move relative to the lens driving device base 10 along the X-axis direction and / or the Y-axis direction. A plurality of magnets 40 are provided on the OIS frame 20. The plurality of magnets 40 are distributed on the inner peripheral side of the OIS frame 20. Preferably, the number of the magnets 40 is 4, and they are respectively arranged on the inner peripheral sides of the four sides of the OIS frame 20.

[0035] After the two first coils 131 and / or the two second coils 132 are energized, an Ampere force is generated under the magnetic field of the magnet 40 to perform a cutting magnetic induction line movement, thereby driving the OIS frame 20 to move relative to the lens driving device base 10 along the X-axis direction and / or the Y-axis direction, achieving the purpose of anti-shake and improving the imaging quality.

[0036] The lens base 30 is movably arranged in the OIS frame 20. In specific implementation, the lens base 30 can move relative to the OIS frame 20 along the Z-axis direction. As Figure 5 shown, an AF coil 50 is provided on the lens base 30. Specifically, the AF coil 50 is an annular coil. The AF coil 50 is sleeved on the lens base 30. The AF coil 50 is electrically connected to the circuit layer 12.

[0037] After the AF coil 50 is energized to generate a magnetic field, an Ampere force is generated under the magnetic field of the magnet 40 to perform a cutting magnetic induction line movement, thereby driving the lens base 30 to move relative to the OIS frame 20 along the Z-axis direction to achieve the focusing and zooming functions and improve the imaging quality.

[0038] On the basis of the above, the lens driving device may further include a first elastic sheet 60, a second elastic sheet 70, and a suspension wire 80. In specific implementation, the first elastic sheet 60 is located between the OIS frame 20 and the lens driving device base 10, and the first elastic sheet 60 is respectively connected to the OIS frame 20 and the lens base 30. The first elastic sheet 60 can provide a restoring force for the lens base 30, and at the same time make the movement of the lens base 30 more linear, which is beneficial to the normal realization of the focusing and zooming functions.

[0039] The second elastic sheet 70 is arranged above the OIS frame 20. The second elastic sheet 70 is respectively connected to the OIS frame 20 and the lens base 30. The second elastic sheet 70 is electrically connected to the AF coil 50. The second elastic sheet 70 can also provide a restoring force for the lens base 30, and at the same time lead out the power supply and signal lines of the AF coil 50 to the second elastic sheet 70.

[0040] One end of the suspension wire 80 is electrically connected to the first solder joint 121, and the other end is electrically connected to the second elastic sheet 70, thereby realizing the electrical connection between the AF coil 50 and the circuit layer 12.

[0041] In some embodiments, the anti-shake motor may further include an outer cover 90. The outer cover 90 covers the lens driving device base 10.

[0042] In summary, for the lens driving device base and the lens driving device provided by the present invention, compared with the prior art, during the injection molding process of the base, the circuit layer is directly embedded inside the base in advance, and the OIS coil is synchronously welded onto the circuit layer and then injection molded. There is no need to design additional components to protect the coil. On the premise of not increasing the overall thickness of the base, the situation that the OIS coil is knocked and skinned is avoided, and the service life of the lens driving device is improved.

[0043] Although terms such as body and OIS coil are used more frequently in this article, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

[0044] In addition, those skilled in the art should understand that although there are many problems in the prior art, each embodiment or technical solution of the present invention can be improved in only one or several aspects, and it is not necessary to solve all the technical problems listed in the prior art or the background art at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be regarded as a limitation to that claim.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lens driving device base, characterized in that: include ontology; A circuit layer, wherein the circuit layer is buried inside the body; An OIS coil, wherein the OIS coil is disposed inside the body and above the circuit layer, and the OIS coil is electrically connected to the circuit layer respectively; Wherein, the main body is provided with a through hole, and the through hole at least exposes a portion of the circuit layer.

2. The lens driving device base according to claim 1, characterized in that: The circuit layer has a plurality of first welding points and a plurality of second welding points, the through holes expose the first welding points, and the OIS coil is electrically connected to the plurality of second welding points.

3. The lens driving device base according to claim 2, characterized in that: The height of the first welding point is lower than the height of the second welding point.

4. The lens driving device base according to claim 2, characterized in that: The OIS coil and the second welding point are coated with a heat insulation layer.

5. The lens driving device base according to claim 2, characterized in that: The OIS coil at least includes two first coils arranged opposite to each other and two second coils arranged opposite to each other, the two first coils are electrically connected to the second welding points, and the two second coils are electrically connected to the second welding points.

6. The lens driving device base according to claim 1, characterized in that: The lens driving device base further includes a first IC and a second IC, wherein the first IC and the second IC are arranged inside the body and below the circuit layer, and the first IC and the second IC are electrically connected to the circuit layer respectively.

7. A lens driving device, characterized in that: A lens driving device base comprising the lens driving device base as described in any one of claims 1 to 5; The lens driving device further comprises an OIS frame and a lens seat, wherein the OIS frame is movably arranged on the upper surface of the lens driving device base, the lens seat is movably arranged in the OIS frame, and the lens seat is electrically connected to the circuit layer.

8. The lens driving device according to claim 7, characterized in that: The OIS frame is provided with a plurality of magnets, and the plurality of magnets are distributed around the OIS frame.

9. The lens driving device according to claim 7, characterized in that: An AF coil is provided on the lens base, the AF coil is sleeved on the lens base, and the AF coil is electrically connected to the circuit layer.

10. The lens driving device according to claim 9, characterized in that: The lens driving device further comprises a first spring sheet, a second spring sheet and a suspension wire, wherein the first spring sheet is located between the OIS frame and the base of the lens driving device, the first spring sheet is connected to the OIS frame and the lens holder respectively, the second spring sheet is arranged above the OIS frame, the second spring sheet is connected to the OIS frame and the lens holder respectively, and the second spring sheet is electrically connected to the third coil; Two ends of the suspension wire are electrically connected to the first welding point and the second elastic piece respectively.

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