| 摘要 |
PROBLEM TO BE SOLVED: To suppress increase in a diameter of a lens barrel.SOLUTION: The lens barrel includes: a first barrel; a second barrel that is disposed inside the first barrel, and rotates with respect to the first barrel to move in an optical axis direction; a main cam groove and a sub cam groove that are formed on one of the first barrel and the second barrel; a main protrusion that is formed on the other of the first barrel and the second barrel and engages with the main cam groove, and when the second barrel rotates with respect to the first barrel, moves the second barrel in the optical axis direction with respect to the first barrel; and a sub protrusion that is formed also on the other of the first barrel and the second barrel and engages with the sub cam groove, and when the second barrel rotates with respect to the first barrel, moves the second barrel in the optical axis direction with respect to the first barrel. When the second barrel rotates with respect to the first barrel to move in the optical axis direction, the lens barrel has a state where the main cam groove does not engage with the main protrusion, and the sub cam groove and the sub protrusion engage with each other, and the sub cam groove is formed by a side wall protruded from a surface where the sub cam groove is formed. |
