1. Technical Field
The disclosure relates to imaging technology and, particularly, to a zoom lens and an image capturing module with reduced overall length and high resolution.
2. Description of Related Art
To optimize image quality of an image capturing module used in an internet protocol (IP) camera, manufacturers tend to employ imaging lenses with high resolution and minimized overall length (the distance between the object-side surface of the imaging lens and the image plane of the image capturing module) to fill user demand for compact devices. There are factors that affect both the resolution and the overall length of the imaging lens, such as the number and positions of lenses employed, the optical power distribution of the employed lenses, and the shape of each employed lens. To achieve a smaller IP camera, the number of lenses can be reduced to decrease the overall length of the imaging lens, but resolution will suffer. To achieve better image capturing ability, generally, increasing the number of the lenses which have high resolution, but also increases the overall length of the image capturing modules.
Therefore, it is desirable to provide a zoom lens and an image capturing module, which can overcome or at least alleviate the described limitations.