Patent ID: 9116345
Filing Date: 2015-08-25
Classification: G02B,Y10T

Abstract:
1. A lens unit for use with an object to be photographed, comprising: a first lens group; a second lens group a third lens group; a fourth lens group; and a tube-shaped holder which holds the first lens group, the second lens group, the third lens group, the and fourth lens group; wherein the first lens group, the second lens group, the third lens group, and the fourth lens group are arranged in sequential order from an object side closest to the object to be photographed; wherein the tube-shaped holder is provided with a second lens group holding part which holds a second lens group located at a second position from the object side; wherein the second lens group holding part is provided with a protruded part which surrounds an outer peripheral end part of the second lens group through a gap space between the outer peripheral end part of the second lens group and the protruded part in a first direction intersecting an optical axis direction and in a second direction intersecting the optical axis direction and the first direction; and wherein the protruded part is provided with a caulked part which is deformed so as to cover the outer peripheral end part from the object side.