Camera module

Abstract

A camera module according to an embodiment of the present invention may include: a housing including an upper plate portion and a side plate portion extending from the upper plate portion; a first lens disposed on an upper plate portion of the housing; a first lens barrel disposed in the housing below the upper plate portion; a second lens barrel disposed in the housing below the first lens barrel; a second lens disposed in the first lens barrel; a third lens disposed in the second lens barrel; a first piezoelectric motor disposed in the housing and coupled to the first lens barrel, and moving the first lens barrel; and a second piezoelectric motor disposed in the housing and coupled to the second lens barrel, and moving the second lens barrel.

Description

technical field [0001] The present invention relates to a camera module. Background technique [0002] A portable device such as a tablet computer or a smartphone is provided with a camera module that acquires image information from a subject. Camera modules for such portable devices are increasingly required to have high pixel density and high performance, and products capable of auto focus (AF) and optical zoom (in which the focal length can be changed) are being introduced recently. [0003] Generally, a camera module provided in a portable device moves a lens in the direction of the optical axis to adjust auto focus and / or optical zoom. To move the lens, a Voice Coil Motor (VCM) type actuator is widely used, by placing a coil and a magnet in the camera module, the actuator moves the lens by electromagnetic force, and a Hall sensor is used to detect the position and position of the lens and move. [0004] However, since the actuator of the existing VCM method has a wea...

AI Technical Summary

Problems solved by technology

[0004] However, since the actuator of the existing VCM method has a weak driving force, it is difficult to realize a long stroke for high magnification zoom

[0005] In addition, when increasing the stroke length of the existing VCM actuator to achieve high-magnification zoom control, the size of the coil and magnet is also increasing, making it difficult to miniaturize the camera module

[0006] In addition, the position control range of the Hall sensor in the prior art is smaller than that used for high-magnification zooming, so there is a problem that it is difficult to achieve high-magnification zooming

[0007] In addition, in recent years, in order to provide optimal optical characteristics, the number of lenses has increased, and as the weight of lenses has increased, there has been a problem that it is difficult to perform an optimal zoom function with one drive unit

[0008] In particular, there is a problem that it is difficult to move a lens with high magnification and high weight due to the small driving force of the conventional ball drive unit

[0009] In addition, as the number of lenses increases, the prior art spring-type driving unit requires a large driving force due to the drooping of the spring, and there is a problem that it is difficult to shoot a video due to the vibration of the spring

Images