Lens driving device and camera module including same

Abstract

One embodiment relates to a lens driving device and a camera module including same. The lens driving device according to the one embodiment can comprise: a base; a pin coupled to the base; and a housing including a lens group and moving in the optical axis direction along the pin. The housing can comprise, in one side thereof, a ball accommodation part and a plurality of balls arranged in the ballaccommodation part. The pin is arranged in the ball accommodation part so as to be capable of guiding the housing while coming in contact with the plurality of balls.

Description

technical field [0001] Embodiments relate to a lens driving device and a camera module including the same. Background technique [0002] Camera modules capture objects and store them as images or videos. The camera module is mounted on a mobile terminal such as a mobile phone, a laptop, a drone or a vehicle. [0003] On the other hand, portable devices such as smartphones, tablets, and laptops have small camera modules, and the camera modules have an auto-focus function that makes the lens In focus. [0004] Currently, camera modules are able to perform zooming by zooming in or out on a remote object by a zoom lens. There is an increasing demand for high magnification zooms that are twice the size of camera modules. [0005] On the other hand, when the lens is moved by mechanical movement using the lens driving device for the zoom function in the camera module, frictional torque is generated. Such frictional torque causes technical problems such as reduction in driving ...

AI Technical Summary

Problems solved by technology

However, when the center of the sphere between the lenses is decentered from the optical axis or tilted (which is a lens skew phenomenon), the viewing angle changes or defocus occurs, which adversely affects image quality and resolution

[0007] Meanwhile, in the camera module, when the lens is moved for the zoom function, the gap in the moving zone may be increased to reduce the frictional torque resistance

However, when the gap is increased, there is a technical contradiction, that is, lens decentering or lens tilt occurs when the zoom is moved or the zoom is reversed

[0008] Furthermore, since a compact camera module has a size limitation, there is a space limitation for zooming, which makes it difficult to realize the zoom function applied to a general large camera

For example, as the height of mobile phones becomes slim, there are restrictions on lens thickness

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