A lens barrel with a shutter unit. While the lens barrel is retracted to obtain a collapsed state or advanced to obtain a photographing state, the flexible printed circuit board of the shutter unit is bendable so as to provide a variable length for the rotation of the shutter unit 71 around the rotary axis J 2 parallel with the optical axis J 1 . When the lens barrel is operated in the photographing state, the flexible printed circuit board is foldable so as to provide a variable length for the movement of the shutter unit 71 in the optical axis J 1 . The flexible printed circuit board can support flexibly without twisting and loosening. The lens barrel further includes a restraint member to bring the shutter unit 71 rotating around the central axis and to restrain the rotation of the shutter unit 71.
1. A lens barrel comprising:
a shutter unit comprising a shutter blade and an actuator;
a driving mechanism driving the shutter unit to move along an optical axis and rotate around a rotary axis parallel with the optical axis in the lens barrel; and
a flexible printed circuit board, comprising a first flexible portion and a second flexible portion, connecting the actuator of the shutter unit and a driving circuit outside the lens barrel, wherein the first flexible portion is foldable so as to provide a first variable length for the movement of the shutter unit in the optical axis, and the second flexible portion is bendable so as to provide a second variable length for the rotation of the shutter unit around the rotary axis parallel with the optical axis.
2. The lens barrel as claimed in claim 1 , further comprising a restraint member bringing the shutter unit rotating around a central axis of the lens barrel and restraining the rotation of the shutter unit.
3. The lens barrel as claimed in claim 2 , wherein the flexible printed circuit board further comprises a central portion located between the first flexible portion and the second flexible portion, and the central portion is fixed to the restraint member.
4. The lens barrel as claimed in claim 1 , wherein the lens barrel is retracted to obtain a collapsed state or advanced to obtain a photographing state, the shutter unit is moved and rotated by the driving mechanism when the lens barrel is operated from the collapsed state to the photographing state, and is simply moved when the lens barrel is operated in the photographing state.
5. The lens barrel as claimed in claim 4 , further comprising a restraint member bringing the shutter unit rotating around a central axis of the lens barrel and restraining the rotation of the shutter unit.
6. The lens barrel as claimed in claim 5 , wherein the flexible printed circuit board further comprises a central portion located between the first flexible portion and the second flexible portion, and the central portion is fixed to the restraint member.