Driving device, camera module and electronic equipment

Abstract

The utility model belongs to the technical field of 3C product accessories, and particularly relates to a driving device, a camera module and electronic equipment. The defects of unreasonable design and the like in the prior art are overcome. The driving device comprises a shell, a focusing assembly is arranged in the shell, a driving rotor which moves in the axial direction of an optical axis along with the focusing assembly is rotationally connected to the focusing assembly, and a plurality of aperture blades are movably connected to the driving rotor. A first driving group formed by at least one driving coil located on the periphery of the circumferential surface of the driving rotor is arranged on the shell, a second driving group formed by at least one driving magnet is arranged in the circumferential direction of the driving rotor, and the first driving group and the second driving group are distributed at intervals; and the first driving group and the second driving group are matched to drive the driving rotor to rotate so as to force the aperture blade to form an incidence hole with a variable size. The method has the advantage that the focusing driving cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3C product accessories, and in particular relates to a driving device, a camera module and an electronic device. Background Art

[0002] Chinese patent number CN202221531119.8 discloses an imaging lens having an optical axis, and the imaging lens includes a lens carrier and a variable through hole group. The lens carrier is used to provide at least one lens, and the lens carrier includes a mounting structure. The variable through hole group includes a plurality of movable blades and a rotating element. The movable blades can be movably arranged together around the optical axis to form a through hole, and the through hole has a variable size through the movement of the movable blades. The rotating element connects the movable blades, and the rotating element drives the movable blades to adjust the size of the through hole. At least one of the movable blades of the variable through hole group and the rotating element is arranged on the mounting structure. The utility model also discloses a camera module having the above-mentioned imaging lens and an electronic device having the camera module.

[0003] The above solution can achieve the change of the aperture size of the aperture, but the above solution has the following defects: during the focusing movement, the magnet and coil driving the aperture will move synchronously with the focusing driving power, and this solution makes the cost of the focusing drive higher. Utility Model Content

[0004] The purpose of the utility model is to provide a driving device, a camera module and an electronic device that can solve the above technical problems.

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

[0006] The driving device includes a shell, a focusing assembly is arranged inside the shell, a driving rotor is rotatably connected to the focusing assembly and moves axially along the optical axis following the focusing assembly, a plurality of aperture blades are movably connected to the driving rotor, a first driving group formed by at least one driving coil located on the periphery of the driving rotor is arranged on the shell, a second driving group formed by at least one driving magnet is arranged in the circumferential direction of the driving rotor, the first driving group and the second driving group are distributed at intervals, and the first driving group and the second driving group cooperate to drive the driving rotor to rotate so as to force the aperture blades to form an incident hole of variable size, and a circuit board for supplying power to the first driving group is arranged on the shell.

[0007] In the above-mentioned driving device, the length of the driving coil in the axial direction of the optical axis is longer than the length of the driving magnet in the axial direction of the optical axis.

[0008] In the above driving device, projected onto a plane perpendicular to the optical axis, the driving coils are located at corresponding corners of the housing.

[0009] In the above-mentioned driving device, a fixing frame is provided on the top surface of the housing, and the circuit board is located in the space surrounded by the fixing frame.

[0010] In the above-mentioned driving device, the circuit board includes a first circuit part distributed parallel to the optical axis, and a second circuit part vertically connected to the first circuit part, and one driving coil is fixed on each of the first circuit parts.

[0011] In the above-mentioned driving device, the first circuit part is fixed in the first positioning groove of the fixing frame, the second circuit part is fixed in the second positioning groove of the fixing frame, and the second circuit part has a lead-out part radially led out from the fixing frame.

[0012] In the above-mentioned driving device, the focusing assembly includes a movable part and a fixed part, and the movable part moves along the optical axis of the driving device. The driving device also includes:

[0013] A main body bracket, the main body bracket is fixed on the movable part and is provided with a light hole;

[0014] The driving rotor is rotatably connected to the main support;

[0015] The aperture blades are rotationally connected to one of the main body bracket or the drive rotor;

[0016] A corner hole is provided on the aperture blade;

[0017] A corner guide column is fixed on the other of the main support or the driving rotor; the corner guide column is inserted into the corner hole, and the corner guide column slides relative to the corner hole in a plane perpendicular to the axis of the light hole.

[0018] In the above-mentioned driving device, the fixing frame is in any one of a closed annular structure and a non-closed annular structure, and at least a part of the main body support is located in the space surrounded by the fixing frame.

[0019] The present application also provides a camera module, which includes the driving device.

[0020] The present application also provides an electronic device, which includes the camera module.

[0021] Compared with the existing technology, the advantages of this application are:

[0022] The driving coil that drives the aperture blades is fixed to the outer shell, and the driving magnet is fixed to the focusing assembly. At this time, the focusing assembly only drives the driving magnet to follow the movement under the drive of the focusing coil and the focusing magnet, which can effectively reduce the material cost of the focusing coil and the focusing magnet in the same focusing stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the driving device provided by the utility model.

[0024] Figure 2 yes Figure 1 Schematic diagram of the top view structure.

[0025] Figure 3 yes Figure 2 Schematic diagram of the cross-section structure along line BB.

[0026] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the middle CC line.

[0027] Figure 5 It is a partial structural schematic diagram of the driving device provided by the utility model.

[0028] Figure 6 It is a schematic diagram of the explosion structure of the driving device provided by the utility model.

[0029] Figure 7 It is a schematic diagram of the exploded structure of the driving device provided by the utility model from another perspective.

[0030] Figure 8 It is a structural schematic diagram of embodiment 3 provided by the utility model.

[0031] In the figure, the outer shell 1, the focusing assembly 2, the focusing magnet 20, the focusing coil 21, the driving rotor 3, the aperture blades 4, the driving coil 40, the driving magnet 41, the corner hole 42, the corner guide post 43, the guide post hole 44, the circuit board 5, the first circuit part 50, the second circuit part 51, the lead-out part 52, the fixing frame 6, the first positioning groove 60, the second positioning groove 61, the main body bracket 7, the guide post 70, and the light hole a. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments.

[0033] This embodiment provides three coordinates: X-axis, Y-axis and Z-axis, the Z-axis is the optical axis, and the axial movement along the optical axis realizes the focusing function.

[0034] Embodiment 1

[0035] like Figure 1 , Figure 3 As shown, the driving device includes a lens driving assembly and an aperture driving assembly. Furthermore, the lens driving assembly includes a housing 1, in which a focusing assembly 2 is arranged. The focusing assembly 2 includes a movable part and a fixed part. The focusing assembly 2 generates a Lorentz force along the optical axis direction by the cooperation of a focusing magnet 20 and a focusing coil 21 to drive the movable part to move. The movable part is fixed to the base (not shown) by springs distributed front and back on the optical axis.

[0036] Secondly, if Figure 1 , Figure 3 and Figure 4 As shown, the aperture drive assembly includes a main frame 7, a drive rotor 3 and a plurality of aperture blades 4. Specifically, the drive rotor 3 is rotatably connected to the focus assembly 2 and moves along the optical axis with the focus assembly 2. The drive rotor 3 and the focus assembly 2 are rotatably connected through a plurality of balls 30 around the circumference of the optical axis. The plurality of aperture blades 4 are movably connected to the drive rotor 3. In order to achieve stable movement of the aperture blades 4 to form an incident hole of variable size, this embodiment is implemented by the following structure:

[0037] The main body support 7 is fixed on the movable part and a light hole a is provided on the main body support 7. The driving rotor 3 and the main body support 7 are connected in rotation by a plurality of balls around the circumference of the optical axis.

[0038] The first method: Figure 5 As shown, the aperture blade 4 and the main body bracket 7 are rotatably connected; for example, the rotatable connection is achieved by the matching of the shaft and the hole. Specifically, a guide post hole 44 is provided on the aperture blade 4, and a guide post 70 inserted into the guide post hole 44 is provided on the main body bracket 7. The guide post hole 44 and the guide post 70 are rotatably matched and connected, that is, the aperture blade 4 slides relative to the main body bracket 7 on the plane with the axis of the guide post 70 as a reference. Of course, the guide post 70 and the guide post hole 44 can also be exchanged, which can also meet the use requirements.

[0039] The corner hole 42 is provided on the aperture blade 4; the corner hole 42 is a waist-shaped hole, for example, provided in the position area of ​​the guide post hole 44 of the aperture blade 4 relatively closer to the optical axis. The corner guide post 43 is fixed on the driving rotor 3; the guide post 70 and the corner guide post 43 are parallel to each other, and can also be parallel to the optical axis. The corner guide post 43 is inserted into the corner hole 42, and the corner guide post slides relative to the corner hole 42 in a plane perpendicular to the axis of the light hole a. At this time, the aperture of the incident hole surrounded by the aperture blade 4 can be changed.

[0040] In another embodiment (not shown), the aperture blade 4 is rotatably connected to the driving rotor 3; specifically, a guide post hole 44 is provided on the aperture blade 4, and a guide post 70 inserted into the guide post hole 44 is provided on the driving rotor 3. The guide post hole 44 and the guide post 70 are rotatably connected, that is, the aperture blade 4 slides relative to the driving rotor 3 on the plane with the axis of the guide post 70 as a reference. Of course, the guide post 70 and the guide post hole 44 can also be exchanged, which can also meet the use requirements. And the corner guide post 43 is fixed to the main bracket 7.

[0041] like Figure 1 , Figure 5 As shown, a first driving group formed by at least one driving coil 40 located on the periphery of the driving rotor 3 is provided on the outer shell 1, and the driving coil 40 is a hollow coil. A second driving group formed by at least one driving magnet 41 is provided in the circumferential direction of the driving rotor 3. The first driving group and the second driving group are distributed at intervals, and the first driving group and the second driving group cooperate to drive the driving rotor 3 to rotate so as to force the aperture blades 4 to form an incident hole of variable size. The driving coil 40 driving the aperture blades 4 is fixed to the outer shell 1, and the driving magnet 41 is fixed to the focusing assembly 2. At this time, the focusing assembly 2 only drives the driving magnet 41 to follow the movement under the drive of the focusing coil and the focusing magnet, which can effectively reduce the material cost of the focusing coil and the focusing magnet in the same focusing stroke.

[0042] The number of driving coils is 1-N, a second driving group formed by at least one driving magnet is arranged in the circumferential direction of the driving rotor, the number of driving magnets is 1-N, the first driving group and the second driving group are spaced apart, and the first driving group and the second driving group cooperate to drive the driving rotor to rotate so as to force the aperture blades to form an incident hole of variable size. N is, for example, 2, 3, 4 or 5, etc.

[0043] In a preferred embodiment, the length of the driving coil 40 in the axial direction of the optical axis is longer than the length of the driving magnet 41 in the axial direction of the optical axis. Because during focusing, the driving coil 40 and the driving magnet 41 will move relative to each other in the axial direction of the optical axis, and the above characteristics can ensure that the aperture drive can also be executed synchronously during the focusing drive.

[0044] Secondly, in the circumferential direction around the optical axis, the length of the driving magnet 41 is longer than the length of the driving coil 40. For example, the driving magnet 41 in the circumferential direction around the optical axis is tile-shaped, and the driving coil in the circumferential direction around the optical axis can also be tile-shaped, or of course, it can be a planar coil, to ensure that the aperture blades 4 can reach the corresponding position in both clockwise and counterclockwise motions. And

[0045] Projected onto a plane perpendicular to the optical axis, the driving coil 40 is located at a corresponding corner of the housing 1. This structure can make the entire driving device more compact.

[0046] In addition, if Figure 1-Figure 6 As shown, a circuit board 5 for supplying power to the first drive group is provided on the housing 1, and the circuit board 5 can be understood as an FPC flexible circuit board. A fixing frame 6 is provided on the top surface of the housing 1, and the circuit board 5 is located in the space surrounded by the fixing frame 6, and the fixing frame 6 is fixed to the top surface of the housing 1 through a glue layer. In order to improve the fixing stability, a plurality of glue storage grooves are provided on one end surface of the fixing frame 6 close to the housing 1, and the glue storage grooves are any one of a circular hole groove, a strip groove and an annular groove. The circuit board 5 and the fixing frame 6 can be pre-assembled into a module, and then the entire module can be installed on the top surface of the housing 1 to complete the installation, so as to improve the efficiency of disassembly and assembly, and at the same time, the firmness of the circuit board 5 and the drive coil 40 installed on the circuit board 5 can also be ensured.

[0047] Specifically, Figure 6-Figure 7 As shown, the circuit board 5 includes a first circuit part 50 distributed parallel to the optical axis, and a second circuit part 51 vertically connected to the first circuit part 50, and a driving coil 40 is fixed on each first circuit part 50. The first circuit part 50 is fixed in the first positioning groove 60 of the fixing frame 6, and the two can be fixedly connected by a glue layer, or the above-mentioned glue storage groove method for enhancing the connection firmness can be adopted, and the thickness of the first circuit part 50 is less than the groove depth of the first positioning groove 60, and the second circuit part 51 is fixed in the second positioning groove 61 of the fixing frame 6, and the thickness of the second circuit part 51 is less than the groove depth of the second positioning groove 61 to prevent the circuit board from contacting the housing 1, and the two can also be fixedly connected by a glue layer, and the first positioning groove 60 and the second positioning groove 61 are connected, and the second circuit part 51 has a lead-out part 52 led out radially from the fixing frame 6. The lead-out part 52 is used to connect with the power supply end.

[0048] As another alternative, the first circuit part 50 can be designed as a ring-shaped structure. A plurality of driving coils 40 are arranged on the inner wall of the first circuit part 50 .

[0049] The fixing frame 6 is in any one of a closed annular structure and a non-closed annular structure, and at least a part of the main support 7 is located in the internal space of the fixing frame 6. The fixing frame 6 can protect the components inside it.

[0050] The working principle of this embodiment is as follows:

[0051] The focusing assembly 2 generates a Lorentz force along the optical axis direction by the cooperation of the focusing magnet 20 and the focusing coil 21 to drive the movable part to move and complete the focusing.

[0052] While focusing, the first drive group and the second drive group can cooperate to drive the drive rotor 3 to rotate so as to force the aperture blades 4 to form an entrance hole of variable size. Of course, the aperture blades 4 can also be driven separately, that is, the aperture blades 4 are driven without focusing.

[0053] Embodiment 2

[0054] Based on the first embodiment, this embodiment further provides a camera module, which includes the driving device of the first embodiment.

[0055] Embodiment 3

[0056] like Figure 8 As shown, based on the second embodiment, this embodiment provides an electronic device, which includes the camera module of the second embodiment, such as a mobile phone.

[0057] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A driving device, comprising a housing (1), a focusing assembly (2) being arranged in the housing (1), a driving rotor (3) being rotatably connected to the focusing assembly (2) and moving along the axial direction of the optical axis with the focusing assembly (2), and a plurality of aperture blades (4) being movably connected to the driving rotor (3), characterized in that: The housing (1) is provided with a first drive group formed by at least one drive coil (40) located on the periphery of the drive rotor (3), and a second drive group formed by at least one drive magnet (41) is provided in the circumferential direction of the drive rotor (3). The first drive group and the second drive group are arranged at intervals, and the first drive group and the second drive group cooperate to drive the drive rotor (3) to rotate so as to force the aperture blades (4) to form an incident hole of a variable size. The housing (1) is provided with a circuit board (5) for supplying power to the first drive group.

2. The driving device according to claim 1, characterized in that: The length of the driving coil (40) in the axial direction of the optical axis is longer than the length of the driving magnet (41) in the axial direction of the optical axis.

3. The driving device according to claim 1, characterized in that: Projected onto a plane perpendicular to the optical axis, the drive coil (40) is located at a corresponding corner of the housing (1).

4. The driving device according to claim 1, characterized in that: A fixing frame (6) is provided on the top surface of the housing (1), and the circuit board (5) is located in a space enclosed by the fixing frame (6).

5. The driving device according to claim 4, characterized in that: The circuit board (5) comprises a first circuit part (50) arranged parallel to the optical axis, and a second circuit part (51) vertically connected to the first circuit part (50), and a driving coil (40) is fixed on each of the first circuit parts (50).

6. The driving device according to claim 5, characterized in that: The first circuit part (50) is fixed in a first positioning groove (60) of the fixing frame (6), the second circuit part (51) is fixed in a second positioning groove (61) of the fixing frame (6), and the second circuit part (51) has a lead-out part (52) radially led out from the fixing frame (6).

7. The driving device according to claim 4, characterized in that: The focusing assembly (2) comprises a movable part and a fixed part, the movable part moves along the optical axis of the driving device, and the driving device further comprises: A main body support (7), the main body support (7) being fixed on the movable part and having a light hole (a) provided on the main body support (7); The driving rotor (3) is rotatably connected to the main body support (7); The aperture blades (4) are rotationally connected to one of the main body bracket (7) or the driving rotor (3); A corner hole (42) is provided on the aperture blade (4); A corner guide column (43) is fixed to the other of the main body bracket (7) and the driving rotor (3); the corner guide column (43) is inserted into the corner hole (42), and the corner guide column (43) slides relative to the corner hole (42) in a plane perpendicular to the axis of the light hole (a).

8. The driving device according to claim 7, characterized in that: The fixing frame (6) is in any one of a closed annular structure and a non-closed annular structure, and at least a portion of the main body support (7) is located in the space enclosed by the fixing frame (6).

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

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

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