CN-122003639-A - Aperture module and camera module including the same

Abstract

Embodiments of the present invention are directed to providing a diaphragm module capable of reducing magnetic interference between an AF magnet and a ring magnet, which is more smoothly driven by appropriately adjusting magnetic pole positions of the AF magnet and the ring magnet, ensuring a diversity of a plurality of coils, a fixed shaft, a number of rolling members, or positions inside the diaphragm module by increasing the number of magnetic poles of a second magnet, thereby enabling more free design of the diaphragm module, and asymmetrically arranging two or more position sensors according to the arrangement of the coils to more accurately measure rotational displacement of the ring magnet, and also adjusting thrust of the diaphragm module by the size, number of turns of the coils, by utilizing the correlation between the number of magnetic poles of the AF magnet and the ring magnet, and a camera module including the diaphragm module.

Inventors

• LI TAIXUN
• Gao Zhonglie
• QUAN ZAIYU

Assignees

• LG伊诺特有限公司

Dates

Publication Date

20260508

Application Date

20250711

Priority Date

20241018

Claims (19)

1. 1. A camera module, comprising: a first magnet including a plurality of first magnet units spaced apart from each other, and The aperture module is provided with a lens module, Wherein, the aperture module includes: a coil unit including a plurality of coils, and A second magnet of annular shape disposed to face the coil unit, the second magnet being configured to rotate about a first axis by interacting with the coil unit, Wherein the second magnet comprises a plurality of N poles and a plurality of S poles which are alternately arranged, Wherein the plurality of first magnet units includes 1-1 magnet units and 1-2 magnet units adjacent to the 1-1 magnet units, Wherein the plurality of S poles of the second magnet includes a first S pole and a second S pole adjacent to the first S pole, and Wherein when a virtual 1-1 line perpendicular to the first axis and passing through the center of the 1-1 magnet unit and the first axis and a virtual 2-1 line perpendicular to the first axis and passing through the center of the first S pole and the first axis overlap each other when viewed in plan view, a virtual 1-2 line perpendicular to the first axis and passing through the center of the 1-2 magnet unit and the first axis and a virtual 2-2 line perpendicular to the first axis and passing through the center of the second S pole and the first axis do not overlap each other when viewed in plan view.
2. 2. The camera module of claim 1, wherein the first magnet and the second magnet do not overlap each other in a direction parallel to the first axis.
3. 3. The camera module of claim 1, wherein the center of the 1-1 magnet is a center of a side forming an inner surface of the 1-1 magnet, and Wherein the center of the 1-2 magnet is a center of a side forming an inner surface of the 1-2 magnet.
4. 4. A camera module according to claim 3, wherein a first angle formed by the 1-1 line and the 1-2 line and a second angle formed by the 2-1 line and the 2-2 line satisfy the following condition when viewed in a top view: the first angle +.q.the second angle x N (N is a natural number of 1 or greater).
5. 5. A camera module according to claim 3, wherein the aperture module comprises: A fixing unit having the coil unit disposed on the fixing unit; A movable unit having the second magnet provided on the movable unit, and A vane unit coupled to the fixed unit and the movable unit, the vane unit forming a variable orifice.
6. 6. The camera module according to claim 5, wherein the movable unit includes a protruding portion provided outside the second magnet, the protruding portion having an inner surface including a flat surface, and Wherein the second magnet includes a flat portion formed on an outer circumferential surface of the second magnet, the flat portion facing the inner surface of the protruding portion.
7. 7. The camera module of claim 5, wherein the plurality of coils are symmetrically disposed with respect to a virtual plane including the first axis.
8. 8. The camera module of claim 7, further comprising a plurality of position sensors disposed on the coil unit, Wherein the plurality of position sensors are disposed between the plurality of coils and asymmetrically disposed with respect to the first axis.
9. 9. The camera module according to claim 5, further comprising a ring-shaped yoke disposed between the second magnet and the movable unit.
10. 10. The camera module of claim 5, wherein the blade unit includes a plurality of blade layers stacked in a direction of the first axis, each of the plurality of blade layers including a plurality of blades.
11. 11. The camera module of claim 10, wherein the plurality of blades included in the blade layer are symmetrically disposed with respect to the first axis.
12. 12. The camera module according to claim 5, wherein the fixing unit includes a plurality of fixing shafts spaced apart from each other at regular angular intervals with respect to the first axis, Wherein the movable unit includes a plurality of movable shafts spaced apart from each other at regular angular intervals with respect to the first axis, and Wherein each of the plurality of blades includes a fixed shaft hole coupled to the fixed shaft and a moving shaft hole coupled to the moving shaft.
13. 13. The camera module according to claim 12, further comprising a rolling member disposed between the fixed unit and the movable unit, Wherein the plurality of coil units are disposed in a first space among a plurality of spaces defined between the plurality of fixed shafts, and Wherein the rolling member is disposed in a second space other than the first space among the plurality of spaces.
14. 14. The camera module according to claim 12, further comprising a rolling member disposed between the fixed unit and the movable unit, Wherein the rolling members, the plurality of coils, and the plurality of fixed shafts do not overlap each other in a direction parallel to the first axis.
15. 15. The camera module of claim 12, wherein the plurality of blades rotate about the plurality of fixed axes when the plurality of movement axes rotate about the first axis, and Wherein the moving shaft hole has a path for rotation of the plurality of blades to allow a size of a variable orifice formed by the plurality of blades to increase as the plurality of moving shafts rotate and approach the plurality of fixed shafts.
16. 16. The camera module of claim 12, wherein a size of the variable aperture formed by the vane unit increases as a distance between the plurality of moving axes coupled to the plurality of vanes and the plurality of fixed axes coupled to the plurality of vanes decreases.
17. 17. The camera module of claim 12, wherein the blade unit includes three blade layers, and Wherein the blade layer comprises three blades arranged point symmetrically with respect to the first axis.
18. 18. The camera module according to claim 17, wherein the three blades are disposed such that an angle between a plurality of virtual lines connecting the first axis and respective fixed shaft holes of the three blades is 120 °.
19. 19. The camera module of claim 17, wherein the blade unit includes a plurality of blade layers, each blade layer including a plurality of blades, Wherein the blade unit includes a first blade and a second blade provided in different blade layers of the plurality of blade layers so as to be adjacent to each other, and Wherein a virtual line connecting the first axis to the fixed shaft hole in the first blade and a virtual line connecting the first axis to the fixed shaft hole in the second blade form an angle therebetween in a range of 35 ° to 45 ° when viewed in a plan view.

Description

Aperture module and camera module including the same Technical Field The present disclosure relates to an aperture module and a camera module including the aperture module. Background The matters described in this section merely provide background information about the embodiments and do not constitute conventional techniques. The camera device is a device that takes a picture or video of an object, and is mounted on a portable device, a drone, a vehicle, or the like. The camera apparatus may include a lens moving device having an Image Stabilization (IS) function, such as an Optical Image Stabilizer (OIS) and an Auto Focus (AF) function, to correct or prevent image shake caused by a user's motion, so as to improve the quality of an image. Such a lens moving apparatus may include a fixed body and a movable body configured to move in an optical axis direction or in a direction perpendicular to the optical axis direction within the fixed body, and the lens module may be coupled to the movable body. In addition, the camera device includes an aperture (aperture) module configured to adjust the amount of incoming light (the amount of incident light), similar to a human iris. The aperture module may be attached to an upper portion of the lens module or may be disposed between a plurality of lens modules. The aperture module may adjust the amount of incident light by changing the size of the aperture using rotation of a plurality of blades forming the aperture about the rotation axis. The movement of the movable body in the lens movement device and the rotation of the plurality of blades in the aperture module may be achieved by an interaction between a coil and a magnet provided in the lens movement device and the aperture module. In this case, the AF magnet for the auto-focusing function and the ring magnet configured to drive the diaphragm module may cause magnetic field interference according to the position of the AF magnet and the position of the ring magnet, thereby generating an external force that interferes with the rotation of the driving magnet. Disclosure of Invention Technical problem An aspect of the present disclosure is directed to solving at least one of the above-mentioned technical problems. Embodiments of the present disclosure propose an aperture module capable of reducing magnetic field interference between an AF magnet and a ring magnet, and a lens moving apparatus including the aperture module. In addition, embodiments may implement various arrangements of coils included in the aperture module. Aspects to be achieved by the present disclosure are not limited to the above aspects, and other aspects not mentioned herein will be clearly understood by those skilled in the art from the following description. Technical proposal A camera module according to an embodiment of the present disclosure may include a first magnet including a plurality of first magnet units spaced apart from each other, and an aperture module. The aperture module may include a coil unit including a plurality of coils, and a second magnet of an annular shape disposed to face the coil unit and configured to rotate about a first axis by interacting with the coil unit. The second magnet may include a plurality of N poles and a plurality of S poles alternately arranged, and the plurality of first magnet units may include 1-1 magnet units and 1-2 magnet units adjacent to the 1-1 magnet units. The plurality of S poles of the second magnet may include a first S pole and a second S pole adjacent to the first S pole. When a virtual 1-1 line perpendicular to the first axis and passing through the center of the 1-1 magnet unit and a virtual 2-1 line perpendicular to the first axis and passing through the center of the first S-pole overlap each other when viewed in plan, a virtual 1-2 line perpendicular to the first axis and passing through the center of the 1-2 magnet unit and a virtual 2-2 line perpendicular to the first axis and passing through the center of the second S-pole do not overlap each other when viewed in plan. In an example, the first magnet and the second magnet may not overlap each other in a direction parallel to the first axis. In an example, the center of the 1-1 magnet may be the center of a side forming the inner surface of the 1-1 magnet, and the center of the 1-2 magnet may be the center of a side forming the inner surface of the 1-2 magnet. In an example, a first angle formed by 1-1 lines and 1-2 lines and a second angle formed by 2-1 lines and 2-2 lines may satisfy a condition that the first angle is not equal to the second angle×n (N is a natural number of 1 or more) when viewed in a top view. In an example, the aperture module may include a fixed unit having a coil unit disposed on the fixed unit, a movable unit having a second magnet disposed on the movable unit, and a vane unit coupled to the fixed unit and the movable unit and forming a variable aperture. In an example, the movable unit may include a pr