Patent ID: 8855477
Filing Date: 2014-10-07
Classification: G02B,G03B

Abstract:
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.