Zoom Lens and Image Pickup Apparatus Using the Same

摘要

A zoom lens includes a first positive lens unit, a first negative lens unit, a stop, and a second positive lens unit, and at the time of zooming, the first positive lens unit is stationary, the first negative lens unit and the second positive lens unit move, and at the time of focusing, the first positive lens unit is stationary, and the first positive lens unit includes a reflecting member and a first positive lens unit object-side system, and the first positive lens unit-object side system is positioned on the object side of the reflecting member, and has a negative refractive power, and the following conditional expressions are satisfied.;3.7

主权项

1. A zoom lens comprising:
a first positive lens unit having a positive refractive power; a first negative lens unit having a negative refractive power; a stop; and a second positive lens unit having a positive refractive power, wherein the first positive lens unit and the first negative lens unit are disposed in order of the first positive lens unit and the first negative lens unit from an object side to an image side, and the second positive lens unit is disposed on the image side of the first negative lens unit, and the stop is disposed between the first negative lens unit and the second positive lens unit, and each of the first positive lens unit, the first negative lens unit, and the second positive lens unit includes a lens component, and at the time of zooming from a wide angle end to a telephoto end, the first positive lens unit is stationary, and the first negative lens unit moves toward the image side and comes closer to the stop, and the second positive lens unit moves toward the object side and comes closer to the stop, and at the time of focusing, the first positive lens unit is stationary, and the first positive lens unit includes a reflecting member having a reflecting surface which bends an optical path, and a first positive lens unit object-side system, and the first positive lens unit object-side system is positioned on the object side of the reflecting surface, and has a negative refractive power, and the following conditional expressions (1), (2), and (3) are satisfied
3.7D1N=D1NIt−D1NIw, D2P=D2PIt−D2PIw, where D1NIt denotes a distance between the first negative lens unit and an image plane, at the telephoto end, D1NIw denotes a distance between the first negative lens unit and the image plane, at the wide angle end, D2PIt denotes a distance between the second positive lens unit and the image plane, at the telephoto end, and D2PIw denotes a distance between the second positive lens unit and the image plane, at the wide angle end, and each of D1NIt, D1NIw, D2PIt, and D2PIw is a focal length when focused to an object at infinity, and f2P is a focal length of the second positive lens unit, and the lens component is a component which has two surfaces namely an object-side surface and an image-side surface, as refracting surfaces in contact with air.