1. Field
Example embodiments relate to a zoom lens module mounted on a portable terminal.
2. Description of the Related Art
Portable terminals, for example, personal digital assistants (PDAs) or mobile terminals, have increasingly come into wide use. These portable terminals have a high-grade camera module having a zoom function and an auto focus function according to customer's requirements.
The zoom function refers to a function in which the focal length of a lens is varied and thus the size of an image of a subject for photography produced on an image sensor is varied. Further, the auto focus function refers to a function in which a distance between a lens and an image sensor is adjusted or the curvature of the lens is varied and thus an image of a subject for photography is most clearly produced on the image sensor.
A lens module having the above-described two functions including the zoom function and the auto focus function, i.e., a zoom lens module, generally includes at least two lens groups, and adjusts a distance between the at least two lens groups, thus embodying the zoom function.
Such a zoom lens module has a structure including mechanical components, such as a gear, a screw member, and a clip member, to convert a rotary motion of a driving source into a rectilinear motion of the lens group, and a cam member to achieve the interlocking movements of the at least two lens groups.
However, the above zoom lens module has the above-described plural mechanical components to vary the distance between the respective lens groups, and thus has an increased volume and a relatively long assembly time.