| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens device suitable for a digital camera equipped with a zoom lens system which is bright even in the longest focal distance state though a zoom ratio is large, and whose length in an optical axis direction in housing is very short. SOLUTION: In the zoom lens device equipped with the zoom lens system and an imaging device for converting an optical image formed by the zoom lens system into electric image data in order from an object side, the zoom lens system is constituted of a 1st group having negative power, a 2nd group having positive power, a 3rd group having positive power and a 4th group in order from the object side. In the case of zooming from the shortest focal distance state to the longest focal distance state, space between the respective groups is changed by moving the 2nd and the 3rd groups, especially, moving the 2nd group to the object side, and focusing in accordance with the change of an object distance is performed by moving the 3rd group. COPYRIGHT: (C)2005,JPO&NCIPI |
