阅读说明：本技术 镜头致动器 (Lens actuator ) 是由 金敬源 催岘镐 于 2019-02-27 设计创作，主要内容包括：实施例涉及一种镜头致动器以及一种包括镜头致动器的相机模块。根据一实施例的镜头致动器可以包括：基部；销,联接到基部；壳体,包括一组镜头,以沿着销在光轴方向上移动；磁体,设置在壳体的一侧上；轭部,与磁体间隔开；以及线圈,设置在磁体与轭部之间。壳体可以包括设置在其一侧处的引导孔和设置在其另一侧处的引导槽。销可以包括设置在引导孔中的第一销和设置在引导槽中的第二销。吸引力可以被施加在轭部与磁体之间。(Embodiments relate to a lens actuator and a camera module including the same. A lens actuator according to an embodiment may include: a base; a pin coupled to the base; a housing including a group of lenses to move in an optical axis direction along pins; a magnet disposed on one side of the housing; a yoke spaced apart from the magnet; and a coil disposed between the magnet and the yoke. The housing may include a guide hole provided at one side thereof and a guide groove provided at the other side thereof. The pin may include a first pin disposed in the guide hole and a second pin disposed in the guide hole. An attractive force may be exerted between the yoke and the magnet.)

1. A lens actuator, comprising:

a base;

a pin coupled to the base;

a housing including a group of lenses and moving in an optical axis direction along the pins;

a magnet disposed on at least one side of the housing;

a yoke disposed to be spaced apart from the magnet; and

a coil disposed between the magnet and the yoke,

wherein the housing includes a guide hole on one side thereof and a guide groove on the other side thereof, and the pin includes a first pin provided in the guide hole and a second pin provided in the guide groove, and

wherein an attractive force is applied between the yoke and the magnet.

2. The lens actuator of claim 1, wherein a portion of the first pin is in contact with one side of the guide hole by the attractive force between the yoke and the magnet.

3. The lens actuator of claim 2, wherein a side of the guide hole that contacts the pin is an area adjacent to the group of lenses.

4. The lens actuator of claim 3, wherein the second pin is spaced apart from a bottom surface of the guide groove.

5. The lens actuator of claim 1, wherein the guide groove is open in a direction parallel to a direction in which the attractive force acts.

6. The lens actuator of claim 1, wherein the guide groove is open in a direction perpendicular to the magnet facing the coil.

7. The lens actuator of claim 1, wherein the height of the magnet is lower than the height of the coil, and the length of the magnet is greater than the length of the coil.

8. The lens actuator of claim 1, wherein an outer circumferential surface of the second pin contacts a side wall of the guide groove, and

wherein a center of the group of lenses is located on a line connecting a center of the first pin and a center of the second pin.

9. A lens actuator, comprising:

a base;

a pin coupled to the base;

a housing including a group of lenses and moving in an optical axis direction along the pin;

a magnet disposed on one side of the housing;

a yoke disposed to be spaced apart from the magnet; and

a coil disposed between the magnet and the yoke,

wherein the housing includes a first guide groove on one side thereof and a second guide groove on the other side thereof, and

wherein the pin includes a first pin disposed in the first guide groove and a second pin disposed in the second guide groove,

wherein an attractive force is applied between the yoke and the magnet.

10. The lens actuator of claim 9, wherein each of the first guide groove and the second guide groove includes an open portion in a different direction.

Technical Field

Background

The camera module performs a function of photographing an object and storing it as an image or video, and is mounted on a mobile terminal such as a mobile phone, a notebook computer, a drone, or a vehicle.

On the other hand, portable devices (such as smartphones, tablet computers, and notebook computers) have built-in micro camera modules, and these camera modules can automatically adjust the distance between an image sensor and a lens to align the focal length of the lens through an auto-focus function.

Recently, the camera module may perform a zoom function of zooming in (zoom up) or zooming out (zoom out) by increasing or decreasing a magnification (magnification) of a distant object using a zoom lens. For the camera module, the demand for high magnification zoom of more than 2 times increases.

On the other hand, when the camera is moved in the camera module using the mechanical movement of the lens actuator to realize the zoom function (zoom function), a friction torque is generated and such a friction torque reduces the driving force, so that technical problems such as an increase in power consumption or a decrease in control characteristics arise.

In particular, to obtain optimal optical characteristics in a camera module, the alignment between the lenses must be well matched. However, when decentering (center) or tilting (tilt) (i.e., lens inclination phenomenon) of the spherical center between lenses from the optical axis occurs, the angle of view is changed or defocusing (defocus) occurs, which adversely affects image quality and resolution.

On the other hand, in the case of increasing the separation distance between moving objects when the lens is moved in the camera module to implement the zoom function, the frictional moment resistance may be reduced. However, if the separation distance between the objects increases, there is a contradiction in technical problems that lens decentering or lens tilting occurs when the zooming movement or the zooming movement is reversed.

Further, there is a technical problem in that, since a compact camera module has a size limitation, it is difficult to implement a zoom function applied to a general large camera because there is a space limitation for zooming.

For example, as the height of a mobile phone becomes thinner (slim), the thickness of the lens is limited.

On the other hand, the contents described in this item (item) provide only background information on the embodiment and do not constitute prior art.

Disclosure of Invention

Technical problem

Drawings

Fig. 1 is a perspective view of a camera module according to an embodiment.

Fig. 2 is a sectional view of a camera module according to the embodiment shown in fig. 1.

Fig. 3 is a perspective view of a camera module with a base and lens cover removed according to the embodiment shown in fig. 1.

Fig. 4a is a perspective view of a first lens assembly and a first driving unit in the camera module according to the embodiment shown in fig. 3.

Fig. 4b is a view illustrating an example of interaction between the first magnet and the first coil unit in the camera module according to the embodiment illustrated in fig. 4 a.

Fig. 5 is a front view of the first lens assembly and the first driving unit shown in fig. 4 a.

Fig. 6a and 6b are conceptual views of driving the first lens assembly and the first driving unit shown in fig. 5;

fig. 7 is a plan view of the first lens assembly and pin shown in fig. 4 a.

Fig. 8a and 8b are conceptual views illustrating the operation of the camera driving device shown in fig. 7.

Fig. 9 is a front view of the camera driving device according to the embodiment shown in fig. 2.

Fig. 10a is a partial perspective view of the camera actuator shown in fig. 4.

Fig. 10b is a graph illustrating hall sensor linearity according to the stroke of the camera actuator shown in fig. 10 a.

Fig. 11 is a front view of a camera driving device according to the second embodiment.

Fig. 12 is a front view of a camera driving device according to a third embodiment.

Fig. 13 is a front view of a camera driving device according to the fourth embodiment.

Embodiments relate to a lens actuator and a camera module including the same.