| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner zoom lens system for use in a camera module having an image sensor and appropriate for an inner focus type. SOLUTION: The inner zoom lens system is equipped with an aperture diaphragm, and includes, sequentially from an object side, a first lens group which is fixed and has minus refractive power, a second lens group which has plus refractive power and performs variable power by moving such that an interval between the first and the second lens groups is reduced when performing the variable power from a wide angle end to a telephoto end, a third lens group which has minus refractive power and moves such that a position of an image plane is corrected depending on the variable power due to the movement of the second lens group, and a fourth lens group which is fixed and has plus refractive power. Lenses used in the first to the fourth lens groups comprise six or less lenses. COPYRIGHT: (C)2006,JPO&NCIPI
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