ZOOM LENS

摘要

There is provided a zoom lens, consisting of sequentially from an object side: a first lens group having a positive refractive power and a focusing function; a second lens group having a negative refractive power and having a variator function of performing zooming; a third lens group having a positive refractive power and a diaphragm; a fourth lens group having a positive refractive power, and having a compensator function of correcting a position of an imaging plane at the time of zooming; and a fifth lens group having a positive or negative refractive power, wherein the second lens group is moved to the imaging plane side from the object side along an optical axis, and the fourth lens group is moved along the optical axis in a state of fixing the first lens group, the third lens group, and the fifth lens group at the time of zooming from a wide angle end to a telephoto end, and only the first lens group is moved along the optical axis at the time of focusing.

主权项

1. A zoom lens, consisting of sequentially from an object side:
a first lens group having a positive refractive power and a focusing function; a second lens group having a negative refractive power and having a variator function of performing zooming; a third lens group having a positive refractive power and a diaphragm; a fourth lens group having a positive refractive power, and having a compensator function of correcting a position of an imaging plane at the time of zooming; and a fifth lens group having a positive or negative refractive power, wherein the second lens group is moved to the imaging plane side from the object side along an optical axis, and the fourth lens group is moved along the optical axis, in a state of fixing the first lens group, the third lens group, and the fifth lens group at the time of zooming from a wide angle end to a telephoto end, and only the first lens group is moved along the optical axis at the time of focusing.