| 摘要 |
A barrier device that is capable of being configured simply and thinly without enlarging an external diameter of an image pickup lens barrel even if an aperture in front of an image pickup lens is large. A pair of principal blade members that can open and close are arranged facing to the aperture. A plurality of pairs of auxiliary blade members are driven to open and close interlocked with open-close operations of the principal blade members. A pair of barrier driving springs are disposed between a barrier driving member that rotates around an optical axis of an image pickup optical system and the principal blade members, and to force to pull them each other in a direction to close the principal blade members. The open-close operations of the principal blade members are performed using spring forces of the barrier driving springs as the barrier driving member rotates.
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