Patent ID: 8325428
Filing Date: 2012-12-04
Classification: G03B

Abstract:
1. A lens barrel having a first lens, a second lens, a lens holding unit adapted to hold the second lens in such a manner that the second lens moves relatively closer to or apart from the first lens in an optical axis direction of the lens barrel, and a diaphragm arranged between the first lens and the second lens and having an inner circumferential portion defining an opening changing in size to adjust an amount of incident light, the lens barrel moving between a photographing position and a stored position in the optical axis direction to change the photographing magnification, wherein a first lens side-surface of the second lens is shaped in a convex form, protruding toward the first lens, and the second lens is arranged close to the first lens and the inner circumferential portion of the diaphragm, the opening of which is changed in size to a full aperture, is arranged inwardly in the radial direction with respect to the lens holding unit and oppositely to the first lens side-surface of the second lens in the radial direction, when the lens barrel is in the stored position.