Camera lens system for image pickup devices

本发明通常涉及用于图象拾取装置的照相机透镜系统，它安装在移动电话或者个人数字助理中，并且更加具体地，涉及用于图象拾取装置的照相机透镜系统，它具有最小化的整体长度来实现微型透镜，并且其中透镜被形成为具有适合的非球面系数来降低透镜上的光的入射角并且提高照相机透镜系统的分辨能力。透镜系统包括：第一组透镜，具有面对物体的凸起的非球面表面；第二组透镜，其上入射有从第一组透镜来的光线并且形成为非球面形状；光圈，位于第一组透镜的一侧，靠近物体；滤光片，位于第二组透镜的一侧，靠近物体的图象；以及图象传感器，用于将通过第一和第二组透镜形成的图象转换成为电信号。照相机透镜系统满足下面的条件，其中第一组透镜的焦距f1在4.7≤f1≤4.9的范围内，第二组透镜的焦距在23≤f2≤24的范围之内，并且照相机透镜系统整个焦距在3.8≤f≤4.0的范围内，并且照相机透镜系统的整体长度等于或者小于4.9mm。 The present invention relates generally to a camera lens system for image pickup devices, which is mounted in a mobile phone or personal digital assistant, and more particularly to a camera lens system for image pickup devices, which has a minimized overall length thereof to implement a micro lens, and in which lenses are formed to have suitable aspheric coefficients to reduce an incident angle of light on the lenses and improve the resolving power of the camera lens system. The camera lens system includes a first group lens having a convex, aspheric surface facing an object, a second group lens on which a light beam is incident from the first group lens and which is formed in an aspheric shape, an iris disposed at a side of the first group lens close to the object, a filter disposed at a side of the second group lens close to an image of the object, and an image sensor for converting the image formed through the first and second group lenses into an electrical signal. The camera lens system satisfies the conditions in which a focal length f1 of the first group lens is within a range of 4.7