Lens driving device, camera module and electronic device

Abstract

This utility model relates to a lens driving device, a camera module, and an electronic device, including a base and a carrier that moves relative to the base along a first axis, and further including a plurality of driving coil groups. At least two driving coil groups are distributed on at least one side of the first axis. The driving coil groups distributed on the same side are arranged in parallel to form a dual-channel driving group. The dual-channel driving group and the driving magnet group are distributed alternately, with one of them located on the base and the remaining one located on the carrier. The advantages are: the use of dual-channel driving coil groups eliminates the defect of insufficient thrust of single-channel coil groups in the prior art under large stroke requirements, and the design precision of dual channels is higher. At the same time, since the power supply lines of the dual-channel coil groups are independent, the failure of a single coil will not cause the entire coil group to fail, greatly improving the reliability of the driving device.

Description

Technical Field

[0001] This utility model belongs to the field of digital photography components, and particularly relates to a lens driving device, a camera module and an electronic device. Background Technology

[0002] In the existing technology, most lens driving devices use a single-channel driving coil, and the driving coils are connected in series, which makes it difficult to meet the driving force requirements under long stroke. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned problems by providing a lens driving device, camera module, and electronic device that can solve the above-mentioned technical issues.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A lens driving device includes a base and a carrier that moves relative to the base along a first axis, and also includes a plurality of driving coil groups, at least two of the driving coil groups being distributed on at least one side of the first axis, the driving coil groups distributed on the same side being arranged in parallel to form a dual-channel driving group, the dual-channel driving group and the driving magnet group being distributed at intervals, and either one of them being disposed on the base, and the remaining one being disposed on the carrier.

[0006] Furthermore, each group of the drive coils includes a first drive coil, and the first drive coils are arranged along the first axis.

[0007] Furthermore, each group of the drive coils includes at least two second drive coils, which are connected in series to form a group of the drive coils.

[0008] Furthermore, the second drive coils of one group of drive coils and the second drive coils of another group of drive coils are arranged alternately along the first axis.

[0009] Furthermore, the driving magnet group is either a Helbeck array magnet group or a permanent magnet array magnet group.

[0010] Furthermore, there are two carriers, defined as carrier one and carrier two, which are movably disposed on carrier one and can follow carrier one to move along the first axis. Carrier one moves along the first axis by cooperating with the dual-channel drive group and the drive magnet group distributed on one side of the first axis. Carrier two moves relative to carrier one along the first axis by cooperating with the dual-channel drive group and the drive magnet group distributed on the other side of the first axis.

[0011] Furthermore, the first carrier is provided with a stop portion, and the second carrier is provided with a buffer portion facing the stop portion.

[0012] Furthermore, the carrier one and the base are movably connected by a first guide mechanism, and the carrier one and the carrier two are movably connected by a second guide mechanism. The first guide mechanism and the second guide mechanism are any one or a combination of two of the ball bearing guide mechanism and the guide rod pair guide mechanism.

[0013] As one application, this application also provides a camera module, which includes the lens driving device described above.

[0014] As one application, this application also provides an electronic device, which includes the aforementioned camera module.

[0015] Compared with existing technologies, the advantages of this application are: the use of a dual-channel drive coil group eliminates the defect of insufficient thrust of the single-channel coil group under large stroke requirements in the prior art, and the dual-channel design has higher precision. At the same time, since the power supply lines of the dual-channel coil group are independent, a single coil failure will not cause the entire coil group to fail, which greatly improves the reliability of the drive device. Attached Figure Description

[0016] Figure 1 A front view diagram of the main components of the lens driving device of this utility model.

[0017] Figure 2 A top view of the main components of the lens driving device of this utility model.

[0018] Figure 3 This is a partial exploded front view schematic diagram of the lens driving device of this utility model;

[0019] Figure 4 This is a schematic diagram of the assembly of the carrier component of this utility model.

[0020] Figure 5 This is a schematic diagram of the explosion of the carrier component of this utility model;

[0021] Figure 6 Two exploded schematic diagrams of the carrier component of this utility model;

[0022] Figure 7 Three exploded schematic diagrams of the carrier component of this utility model;

[0023] Figure 8 This is a schematic diagram of the interaction of the driving component of this utility model;

[0024] Figure 9This is a schematic diagram showing the distribution of the guiding mechanism of this utility model;

[0025] Figure 10 This is a schematic diagram illustrating an example of an electronic device in Embodiment 4.

[0026] In the figure, there are: base 1, carrier 2, carrier one 21, stop part 211, carrier two 22, buffer part 221, dual-channel drive group 3, drive coil group 31, first drive coil 311, second drive coil 312, drive magnet group 4, first guide mechanism 5, second guide mechanism 6, and first axis X. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] Example 1

[0032] like Figures 1-2 As shown, the lens driving device includes a base 1 for supporting components, and a carrier 2 that moves along a first axis X within the base 1. The carrier 2 is used to support optical components. In this embodiment, the carrier 2 is used for focusing and / or zooming movements. It also includes a plurality of drive coil groups 31 for providing driving force. At least two drive coil groups 31 are distributed on at least one side of the first axis X. The drive coil groups 31 distributed on the same side are arranged in parallel to form a dual-channel drive group 3. The dual-channel drive group 3 and the drive magnet group 4 are distributed at intervals, and one of them is located on the base 1, while the other is located on the carrier 2. In this embodiment, at least one carrier 2 is included.

[0033] In this embodiment, to optimize the internal circuitry of the device and reduce manufacturing difficulty, such as... Figure 3 As shown, the aforementioned driving magnet group 4 is placed on the moving carrier 2, and the dual-channel driving group 3 is placed on the base 1 which is fixed relative to the carrier 2.

[0034] The aforementioned drive coil group 31 has two schemes in this embodiment (such as...) Figure 8 (as shown)

[0035] Option 1: Each group of drive coils 31 includes a first drive coil 311, and the first drive coils 311 are arranged along the first axis X.

[0036] In this scheme, each group of drive coils 31 consists of an independent first drive coil 311 extending along the first axis X. Two or more first drive coils 311 located on the same side of the first axis X are connected in parallel to form a dual-channel drive group 3. The parallel connection means that the current of each channel can be controlled independently or operate simultaneously, enabling individual channel operation (only one channel is energized) or cooperative operation (both channels are energized simultaneously), greatly improving the electromagnetic drive thrust of the device.

[0037] Option 2: Each group of drive coils 31 includes at least two second drive coils 312, which are connected in series to form a group of drive coils 31; specifically, the second drive coils 312 of one group of drive coils 31 and the second drive coils 312 of another group of drive coils 31 are arranged alternately along the first axis X.

[0038] The core of this scheme lies in the fact that each group of driving coils 31 consists of at least two smaller second driving coils 312 connected in series. For example, a group of driving coils 31 may contain driving coils C1 + C2 connected in series, arranged alternately to make the driving magnetic field more fine and uniformly distributed in the direction of motion (first axis X). Figure 8 As shown, four second drive coils 312 are mentioned above. Two second drive coils 312 are connected in series and the other two second drive coils 312 are connected in series with each other. The two sets of drive coils 31 connected in series are evenly arranged on the first axis X. During the movement, the magnet on the carrier 2 can always generate interaction force with the coils of two different channels at the same time, which reduces the fluctuation of driving force and is conducive to achieving smoother and more precise motion control.

[0039] In this embodiment, the base 1 of the lens driving device has a dual-channel drive group 3 of scheme one on one side wall, and a dual-channel drive group 3 of scheme two on the other side of the base 1. At the same time, drive magnet groups 4 are distributed at intervals with the two dual-channel drive groups 3 on the carrier 2. In addition, as shown in FIG4, there are two carriers 2 in this embodiment, which are defined as carrier one 21 and carrier two 22. Carrier two 22 is movably disposed on carrier one 21 and can follow carrier one 21 to move along the first axis X. The two drive magnet groups 4 are respectively disposed on carrier one 21 and carrier two 22. Carrier one 21 moves along the first axis X by cooperating with the dual-channel drive group 3 and drive magnet group 4 distributed on one side of the first axis X. Carrier two 22 moves relative to carrier one 21 along the first axis X by cooperating with the dual-channel drive group 3 and drive magnet group 4 distributed on the other side of the first axis X.

[0040] Furthermore, in this embodiment, the driving magnet group 4, which is spaced apart from the dual-channel driving group 3 in Scheme 1, is a Helbeck array magnet group, while the driving magnet group 4, which is spaced apart from the dual-channel driving group 3 in Scheme 2, is a permanent magnet array magnet group. However, it is not limited to the above combination method, and it can be optimized according to the actual working conditions.

[0041] Example 2

[0042] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that, for the lens driving device of Embodiment 1, this embodiment describes other designs for the carrier of the lens driving device.

[0043] like Figures 5-7 As shown, a stop portion 211 is provided on carrier 1 21, and a buffer portion 221 facing the stop portion 211 is provided on carrier 22.

[0044] The two work together to achieve a dual function: when the displacement of the second carrier 22 exceeds the limit due to accidental impact or overdrive, its buffer part 221 will come into contact with the stop part 211 of the first carrier 21, and prevent the second carrier 22 from moving further through physical interference, thus avoiding damage to the coil and the magnet assembly; the intermittent contact between the buffer part 221 and the stop part 211 is used to achieve the inertial drive of the second carrier 22 when the first carrier 21 moves.

[0045] Carrier 1 21 and base 1 are movably connected by a first guide mechanism 5, and carrier 1 21 and carrier 2 22 are movably connected by a second guide mechanism 6. The first guide mechanism 5 and the second guide mechanism 6 are any one or a combination of two of the following: a ball bearing guide mechanism and a guide rod pair guide mechanism. Figure 9 As shown, in this embodiment, ball bearing guide mechanisms are used between the carrier 21 and the base 1, and between the first guide mechanism 5 and the second guide mechanism 6. Both sets of ball bearing guide mechanisms are supported by three balls, achieving high stability and high precision. At the same time, the three-ball bearing design has better space efficiency. Compared with other designs such as four or more balls, the three-ball bearing design maintains the same stability while occupying less space.

[0046] Example 3

[0047] The structure and principle of this embodiment are basically the same as those of Embodiment 1 and Embodiment 2. The difference is that, in relation to the lens driving devices of Embodiment 1 and Embodiment 2, the camera module of this embodiment includes a lens driving device.

[0048] A camera module is a complete photographic device, typically including multiple components such as a lens, storage medium, display screen, and control panel. Outside the camera module, it also includes an external housing, control interface, display screen, memory card slot, etc., forming a complete working system capable of performing various functions such as image capture, real-time preview, storage, playback / transmission, etc., representing a more advanced application.

[0049] Example 4

[0050] The structure and principle of this embodiment are basically the same as those of Embodiment 3. The difference lies in that, in relation to the camera module of Embodiment 3, the electronic device in this embodiment includes a camera module.

[0051] like Figure 10 As shown, electronic devices refer to those devices that rely on electronic technology to perform specific functions, such as processing signals, data, or converting energy. They are widely used in fields such as communication, computing, entertainment, and industrial control, including but not limited to smartphones, computers, televisions, audio systems, and medical instruments, which greatly improve the convenience and efficiency of modern life.

[0052] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A lens driving device, comprising a base (1) and a carrier (2) moving relative to the base (1) along a first axis (X), and further comprising a plurality of drive coil groups (31), at least two of the drive coil groups (31) being distributed on at least one side of the first axis (X), characterized in that, The drive coil group (31) distributed on the same side is arranged in parallel to form a dual-channel drive group (3). The dual-channel drive group (3) and the drive magnet group (4) are distributed at intervals, and one of them is located on the base (1), while the other is located on the carrier (2).

2. The lens driving device according to claim 1, characterized in that, Each of the drive coil groups (31) includes a first drive coil (311), and the first drive coils (311) are arranged along the first axis (X).

3. The lens driving device according to claim 1, characterized in that, Each of the drive coil groups (31) includes at least two second drive coils (312), which are connected in series to form a group of drive coil groups (31).

4. The lens driving device according to claim 3, characterized in that, The second drive coil (312) of one set of the drive coil group (31) and the second drive coil (312) of another set of the drive coil group (31) are arranged alternately along the first axis (X).

5. The lens driving device according to claim 1, characterized in that, The driving magnet group (4) is either a Heilbeck array magnet group or a permanent magnet array magnet group.

6. The lens driving device according to any one of claims 1-5, characterized in that, The carrier (2) has two carriers, defined as carrier one (21) and carrier two (22) which is movably disposed on carrier one (21) and can follow carrier one (21) to move along the first axis (X). Carrier one (21) moves along the first axis (X) by the cooperation of the dual-channel drive group (3) and the drive magnet group (4) distributed on one side of the first axis (X). Carrier two (22) moves relative to carrier one (21) along the first axis (X) by the cooperation of the dual-channel drive group (3) and the drive magnet group (4) distributed on the other side of the first axis (X).

7. The lens driving device according to claim 6, characterized in that, The carrier one (21) is provided with a stop part (211), and the carrier two (22) is provided with a buffer part (221) facing the stop part (211).

8. The lens driving device according to claim 6, characterized in that, The carrier one (21) and the base (1) are movably connected by the first guide mechanism (5), and the carrier one (21) and the carrier two (22) are movably connected by the second guide mechanism (6). The first guide mechanism (5) and the second guide mechanism (6) are any one or a combination of two of the ball guide mechanism and the guide rod pair guide mechanism.

9. A camera module, characterized in that, The camera module includes the lens driving device according to any one of claims 1-8.

10. An electronic device, characterized in that, The electronic device includes the camera module as described in claim 9.

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