Zoom lens barrel capable of changing photographing magnification and image pickup apparatus having the same

摘要

A zoom lens barrel capable of decreasing a distance between a lens and a diaphragm in an optical axis direction to thereby increase the photographing magnification and at the same time to reduce the lens barrel size, and capable of changing a diaphragm aperture diameter according to zoom control. The lens barrel has a lens relatively movable toward and away from an iris diaphragm in the optical axis direction with a change in the photographing magnification. An operation of the iris diaphragm is controlled in such a manner that a minimum diameter of an aperture of diaphragm blades of the iris diaphragm changes according to an amount of intrusion of a part of the lens into the aperture of the diaphragm blades in a range where the diaphragm blades do not interfere with the lens.

主权项

1. A zoom lens barrel comprising:
a diaphragm unit having diaphragm blades that define an aperture; a lens unit configured to be relatively movable toward and away from said diaphragm unit in a direction of an optical axis with a change in a photographing magnification, wherein said lens unit has a lens a part of which intrudes into the aperture of the diaphragm blades when said lens unit moves close to said diaphragm unit, and has a lens holding member which holds the lens; and a control unit configured to control an operation of said diaphragm unit, wherein the control unit controls a minimum diameter of the aperture of the diaphragm blades according to an amount of intrusion of the part of the lens into the aperture of the diaphragm blades within a range where the diaphragm blades do not interfere with the lens.