Patent ID: 9678319
Date: 2017-06-13
CPC Classifications: G02B

Claim:
1. A zoom lens having a macro mode that includes a first mode allowing zooming and focusing including infinity and a second mode allowing obtaining an imaging magnification absolute value greater than 0.25 times, the zoom lens comprising: a lens group A having a positive refractive power; a lens group B having a negative refractive power and arranged at the image side relative to the lens group A so as to be neighbored by the lens group A with an interval of air interposed between them; a focus lens group having a negative refractive power and arranged at the object side relative to the lens group A so as to be movable in the direction of the optical axis in a focusing operation; and a lens group D moving at the time of zooming, arranged at the object side relative to the focus lens group so as to change the distance between itself and the focus lens group at the time of the focusing operation; wherein, in the first mode, at the time of zooming from the wide-angle end to the telephoto end, the lens group A is adapted to move so as to be located at the object side to reduce the distance between itself and the focus lens group at the telephoto end rather than at the wide-angle end; and the lens group B is adapted to move so as to be located at the object side to increase the distance between itself and the lens group A at the telephoto end rather than at the wide-angle end; the zoom lens operating for focusing including infinity focusing by moving the focus lens group having a negative refractive power in the direction of the optical axis; and in the second mode, the lens group A is located within the moving range of the lens group A in the first mode for zooming from the wide-angle end to the telephoto end; and the lens group B is located at the image side relative to a first position and at the object side relative to a second position; the first position being a position at which the lens group B is located in the first mode when the lens group A in the first mode is located at the position same as the position of the lens group A in the second mode or in a zooming state in which the lens group A in the first mode is located at the position same as the position of the lens group A in the second mode, the second position being a position of the lens group B at the wide-angle end in the first mode, the zoom lens operating for focusing by moving the focus lens group having a negative refractive power in the direction of the optical axis.