Patent ID: 7835085

Claim:
A lens barrel, comprising: a first moving barrel having a first cam that is operable to perform a focusing operation and holds an optical system used for the focusing operation, a second moving barrel having a second cam and provided in relation to the first moving barrel, a third moving barrel having a third cam operable to perform a zooming operation, a driving cam pin engaged with the first cam, the second cam and the third cam, and a holding member holding the driving cam pin to rotate around an optical axis and move along the optical axis with respect to the first moving barrel, the second moving barrel and the third moving barrel, wherein the third moving barrel is able to rotate at a first angle (α) corresponding to a rotation of a zoom operation ring, the first angle (α) corresponds to a sum of a second angle (γ), in which the driving cam pin rotates along with the second cam, and a third angle (δ), in which the driving cam pin rotates along with the third cam, at a time of performing the zooming operation, the driving cam pin moves in a distance determined by a combination of the second cam and the third cam, and the optical system is moved along the optical axis in accordance with a movement of the driving cam pin, and at a time of performing the focusing operation, the optical system is moved along with the optical axis by rotating the first moving barrel with respect to the driving cam pin.