Lens driving mechanism, camera module and electronic equipment

Abstract

The utility model relates to a lens driving mechanism, camera module and electronic equipment, including base and moving carrier that moves along optical axis relative to base linear under the drive of driving subassembly, said driving subassembly includes the coil group that is formed by at least two parallel drive coil, and monopole magnet that the coil group is distributed with interval, any one of the coil assembly and the monopole magnet is arranged on the base, and the other one is arranged on the movable carrier. The driving assembly has the advantages that the driving coils and the single monopole magnet which are connected in parallel are adopted, the resistance is effectively reduced while the layout of the driving assembly is optimized, and insufficient thrust caused by series connection due to overlong stroke and large resistance is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of electronic equipment camera, especially relates to a lens drive mechanism, camera module and electronic equipment. BACKGROUND

[0002] Lens drive mechanism is a key component for camera equipment and optical instruments, responsible for accurately adjusting the position of the lens to achieve focusing and zooming. It is usually composed of a drive system, a lens group and a control system, which converts the motion into linear or rotational movement of the lens through the rotation of the motor. The advantages of this mechanism include high precision, real-time control, reduced wear and tear and intelligent automatic control, widely used in cameras, microscopes and projectors and other devices to improve image clarity and user experience.

[0003] In the prior art, the required stroke of the drive system is large, and the length of the carrier is short. Multiple magnets on a single coil base on the carrier will result in complex wiring process, and placing multiple-pole magnets on the carrier will result in insufficient end thrust. At the same time, the series-connected coils have a large resistance, and a higher voltage is required to generate sufficient current to power the drive system. UTILITY MODEL CONTENT

[0004] The utility model aims at the above problem, provides a lens drive mechanism, camera module and electronic equipment that can solve the above technical problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The lens drive device comprises a base and a dynamic carrier which linearly moves along the optical axis relative to the base under the drive of a drive assembly. The drive assembly comprises a coil group formed by at least two parallel drive coils, and a single-pole magnet distributed in space with the coil group. Any one of the coil group and the single-pole magnet is arranged on the base, and the other is arranged on the dynamic carrier.

[0007] Further, the length of the coil group in the axial direction of the optical axis is longer than the length of the single-pole magnet.

[0008] Further, the drive coil has two and is distributed in the axial direction of the optical axis. The drive coil has a first part and a second part perpendicular to the optical axis and distributed along the optical axis, and the first part of one of the drive coils and the second part of the other drive coil are close to each other. When the two drive coils are energized respectively, the first part and the second part cooperate with the single-pole magnet to generate a driving force for driving the linear movement of the dynamic carrier.

[0009] Further, the projection of the single pole magnet on the coil group covers at least the first part and the second part close to each other and does not cover the first part and the second part far from each other.

[0010] Further, the driving coil is a square ring coil, and the first part and the second part close to each other are in face-to-face contact.

[0011] Further, the driving coil is connected or formed on a flexible circuit board.

[0012] Further, the flexible circuit board comprises a plurality of circuit layers arranged in parallel, and the plurality of circuit layers constitute the driving coil.

[0013] Further, the moving carrier is connected to the base through a guide mechanism, and the guide mechanism comprises any one or a combination of the other of a guide shaft pair and a ball set.

[0014] As an application scheme, the application further provides a camera module, which comprises the lens driving mechanism.

[0015] As an application scheme, the application further provides an electronic device, which comprises the camera module.

[0016] Compared with the prior art, the application has the advantages that the parallel driving coil and the single pole magnet are adopted, the driving assembly layout is optimized, the resistance is effectively reduced, and the insufficient thrust caused by the long stroke and large resistance in series connection is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an internal main body structure assembly drawing of the lens driving device of the application;

[0018] Figure 2 It is an exploded left front view of the main body structure of the lens driving device of the application;

[0019] Figure 3 It is an exploded right front view of the main body structure of the lens driving device of the application;

[0020] Figure 4 It is a left side view of the base and the main components fixed on the base of the application;

[0021] Figure 5 It is a right side view of the base and the main components fixed on the base of the application;

[0022] Figure 6 It is a comparison drawing of the flexible circuit board before and after current modification of the application;

[0023] Figure 7An example schematic diagram for the electronic device in Example Four.

[0024] In the figure, base 1, drive assembly 2, coil set 20, drive coil 200, first portion 200-1, second portion 200-2, single pole magnet 21, moving carrier 3, focusing carrier 30, zoom carrier 31, flexible circuit board 4, guide mechanism 5, guide shaft pair 50, ball set 51, housing 6, optical axis Z. DETAILED DESCRIPTION

[0025] The utility model will be described in further detail below in connection with the drawings and examples. It can be understood that the specific examples described herein are merely for the purpose of explaining the utility model and are not a limitation on the utility model. In addition, it should be noted that, for the purpose of description, only the parts related to the utility model are shown in the drawings, not all the structures.

[0026] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0027] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0028] In the description of the embodiment, the terms "upper", "lower", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0029] Example One

[0030] As Figure 1As shown, the lens driving mechanism comprises a base 1 carrying various components, and a shell 6 fixedly connected with the base 1 for protecting the internal components, and a moving carrier 3 linearly moving along the optical axis Z relative to the base 1 under the driving of a driving assembly 2 is arranged on the base 1, and the moving carrier 3 is used for carrying the lens for the zooming movement, and in the embodiment, in order to achieve the zooming effect, the moving carrier 3 is provided with a driving assembly 2 for driving the moving carrier 3 to move along the optical axis Z, and the driving assembly 2 is arranged on the base 1. Figure 1 As shown, the moving carrier 3 has two, and the two moving carriers 3 are distributed in the axial direction of the optical axis Z, and each moving carrier 3 is equipped with an independently operated driving assembly 2, and in the embodiment, the two moving carriers 3 are divided into a focusing carrier 30 and a zooming carrier 31 as shown in Figure 1 The driving assembly 2 for driving the focusing carrier 30 and the driving assembly 2 for driving the zooming carrier 31 are respectively arranged on the two sides of the lens driving mechanism, which is to prevent the crosstalk problem between the two driving assemblies 2, and also to maintain the weight balance of the two sides of the lens driving mechanism.

[0031] Specifically, in order to ensure the smooth movement of the focusing carrier 30 and the zooming carrier 31, the above-mentioned driving assembly 2 comprises a coil group 20 formed by at least two parallel driving coils 200, and a single pole magnet 21 distributed in the interval of the coil group 20, and any one of the coil group 20 and the single pole magnet 21 is arranged on the base 1, and the other is arranged on the moving carrier 3, and in the embodiment, in order to consider the simplicity and durability of the circuit design, the coil group 20 is arranged on the side wall of the base 1, and the single pole magnet 21 is arranged on the side wall of the moving carrier 3, and the coil group 20 and the single pole magnet 21 are oppositely arranged in the interval, and the parallel driving coils 200 can effectively reduce the resistance and avoid the insufficient thrust caused by the long stroke and large resistance in series;

[0032] In the embodiment, the driving coil 200 has two and is distributed in the axial direction of the optical axis Z, as shown in Figure 2As shown, the drive coils 200 are square annular coils, each of which has a first portion 200-1 and a second portion 200-2 perpendicular to and distributed along the optical axis Z, which can also be designed into other shapes according to specific use conditions, wherein the first portion 200-1 of one drive coil 200 and the second portion 200-2 of the other drive coil 200 are close to or abut each other, the second portion 200-2 of one drive coil 200 and the first portion 200-1 of the other drive coil 200 are away from each other, in this embodiment, the drive coils 200 in the drive assembly 2 for driving the focusing carrier 30 abut each other, while the drive coils 200 in the drive assembly 2 for zoom movement are close to each other, the close and abutting portions have the same direction of current flow, the above-mentioned first portion 200-1 and second portion 200-2 are used to drive the single pole magnet 21, when the two drive coils 200 are energized respectively, the first portion 200-1 and the second portion 200-2 together with the single pole magnet 21 cooperate to generate a driving force for linear movement of the drive carrier 3; At the same time, the length of the coil set 20 in the optical axis Z is longer than the length of the single pole magnet 21, the purpose is to enable the single pole magnet 21 to be always within the driving force range of the above-mentioned coil set 20, to ensure that the coils at both ends of the drive coil 200 are away from the single pole magnet 21, to avoid generating reverse current, wherein the projection of the single pole magnet 21 on the coil set 20 covers at least the close first portion 200-1 and the second portion 200-2 and does not cover the away first portion 200-1 and the second portion 200-2, specifically, the above-mentioned first portion 200-1 and second portion 200-2 are always within the operating range of the single pole magnet 21, and are used to push the single pole magnet 21 to move.

[0033] As Figure 3 shown, in order to ensure stable power supply of the above-mentioned drive coil 200 and optimize the space occupation inside the lens driving mechanism, in this embodiment, two parallel drive coils 200 are formed using a flexible circuit board 4, the flexible circuit board 4 is FPC, thereby solving the problem of insufficient end thrust of the large-stroke motor with the least channel, and the flexible circuit board 4 is attached to the outer side wall of the above-mentioned base 1, this design can provide stable current output for the drive coil 200 while occupying smaller space. In other embodiments, the flexible circuit board 4 is used to supply power to the drive coil 200, and the drive coil 200 is connected in parallel with the flexible circuit board 4.

[0034] The flexible circuit board 4 includes two groups of circuit layers with multiple layers and in parallel, each group of circuit layers constitutes a drive coil 200, by integrating two drive coils 200 on the same flexible circuit board and in parallel, the space can be effectively saved and the driving force can be improved. Secondly, the flexible circuit board 4 can also be called FPC circuit board, the flexible circuit board 4 is an insulation + a layer of copper + a layer of insulation + a layer of copper, and the insulation layer is hollowed out between different layers to connect, that is, the flexible circuit board 4 is obtained.

[0035] Regarding the parallel details of the above-mentioned flexible circuit board 4 and the drive coil 200, as shown in Figure 6 , when the N layers of the prior art flexible circuit board 4 are in series with the resistance of R, the total resistance is NR, limited by the voltage, the length of the drive coil 200 is L, the driving voltage is U, the magnetic induction intensity is B, and the driving force is BUL / R; when the N layers of the present embodiment are in parallel, it is equivalent to each layer being connected to the total power supply, when the length of the drive coil 200 is increased to X times of the original, and the width is changed to 1 / Y of the original (that is, the cross-sectional area of the coil is changed), the driving force is N 2 BUL / (YXR).

[0036] It can be seen that when XY is less than N 2 , the driving force will increase.

[0037] It can be seen through comparison that the parallel flexible circuit board 4 can increase the length of the drive coil 200 (change X) and change the width (change Y), and after reducing the resistance, more lines can be wound to obtain greater thrust.

[0038] Embodiment two

[0039] The structure and principle of the present embodiment are basically the same as those of embodiment one, the difference between the structures is that, for the lens driving mechanism of the above-mentioned embodiment one, the present embodiment describes the carrier guide structure in the lens driving mechanism.

[0040] As shown in Figures 4-5 , in order to reduce the moving loss of the moving carrier 3 in embodiment one, the guide mechanism 5 is provided, so that the moving carrier 3 is connected to the base 1, the guide mechanism 5 plays a guiding and reducing friction role,

[0041] Specifically, the guide mechanism 5 includes any one or a combination of the guide shaft pair 50 and the ball set 51.

[0042] As shown in the figure, in this embodiment, both moving carriers 3 are connected to the base 1 through a guide mechanism 5. One of the guide mechanisms 5 consists of a guide shaft pair 50 and a ball set 51. The guide shaft pair 50 and the ball set 51 are respectively arranged in the bottom space of the moving carrier 3. The guide shaft pair 50 is designed to provide a precise and stable guiding effect, while the ball set 51 provides support and has low friction, which greatly reduces the energy consumption of the entire drive assembly 2.

[0043] Example 3

[0044] 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 mechanism of Embodiment 1 and Embodiment 2, the camera module of this embodiment includes a lens driving mechanism.

[0045] A camera module is a device used to adjust the position or focal length of a lens, typically through mechanical, electric, or other means. The main function of a camera module is to adjust the position of the lens to control the focal length, focusing, or other focusing capabilities of the optical system.

[0046] Example 4

[0047] The structure and principle of this embodiment are basically the same as those of Embodiment 3. The difference is that, in relation to the camera module of Embodiment 3, the electronic device in this embodiment includes a camera module.

[0048] like Figure 7 As shown, electronic devices include camera modules, which are modular components that integrate cameras, lenses, sensors, and other related elements. Camera modules typically include components such as image sensors, image processors, lenses, optical filters, focus adjusters, and autofocus modules, and can be directly used in various devices and applications, such as smartphones, tablets, surveillance cameras, and vehicle cameras.

[0049] 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. Lens drive mechanism comprising a base (1) and a moving carrier (3) linearly movable along an optical axis (Z) relative to the base (1) under drive of a drive assembly (2), characterized in that The driving assembly (2) comprises a coil group (20) formed by at least two parallel driving coils (200) and a single pole magnet (21) spaced from the coil group (20), and any one of the coil group (20) and the single pole magnet (21) is arranged on the base (1), and the other is arranged on the moving carrier (3).

2. The lens driving mechanism according to claim 1, characterized by, The length of the coil group (20) in the axial direction of the optical axis (Z) is longer than the length of the single pole magnet (21).

3. The lens driving mechanism according to claim 1 or 2, characterized by The driving coil (200) has two and is distributed in the axial direction of the optical axis (Z), and the driving coil (200) has a first part (200-1) and a second part (200-2) perpendicular to the optical axis (Z) and distributed along the optical axis (Z), wherein the first part (200-1) of one of the driving coils (200) and the second part (200-2) of the other driving coil (200) are close to each other. When the two driving coils (200) are energized respectively, the first part (200-1) and the second part (200-2) together cooperate with the single pole magnet (21) to generate a driving force for driving the linear movement of the moving carrier (3).

4. The lens driving mechanism according to claim 3, characterized by, The projection of the single pole magnet (21) on the coil group (20) covers at least the first part (200-1) and the second part (200-2) close to each other and does not cover the first part (200-1) and the second part (200-2) far away from each other.

5. The lens driving mechanism according to claim 3, characterized by The driving coil (200) is a square ring coil, and the first part (200-1) and the second part (200-2) close to each other are in contact with each other by face to face.

6. The lens driving mechanism according to claim 1, characterized by, The driving coil (200) is connected or formed on a flexible circuit board (4).

7. The lens driving mechanism according to claim 6, characterized by The flexible circuit board (4) comprises a plurality of layers of circuit layers arranged in parallel, and the plurality of layers of circuit layers constitute the driving coil (200).

8. The lens driving mechanism according to claim 1, characterized by, The moving carrier (3) is connected to the base (1) through a guide mechanism (5), and the guide mechanism (5) comprises any one or a combination of the two of a guide shaft pair and a ball set.

9. A camera module characterized by, The camera module comprises the lens driving mechanism according to any one of claims 1-8.

10. An electronic device, characterized by The electronic device comprises the camera module according to claim 9.

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