Patent ID: 8035733

Claim:
A lens barrel rotation detection apparatus for detecting a rotational state of a lens barrel to which a lens for image pickup is attached and which is rotated in a horizontal direction or a vertical direction by driving force of a driving section, comprising: a single rotatable member rotatable together with rotation of said lens barrel; and three rotation detection means for detecting a rotational state of said rotatable member; said rotatable member having a fixed pattern of indicia formed on said rotatable member so as to be detected by said rotation detection means and a rotation limit section indicative of limit positions of a range of rotation of said lens barrel; and said rotation detection means being disposed for detection of presence or absence of rotation of said rotatable member and the limit positions of the range of rotation, said three rotation detection means detecting a first arrangement of said indicia when said rotatable member rotates in a first direction to a first limit position and a second arrangement of said indicia when said rotatable member rotates in an opposite direction to a second limit position, wherein said first and second arrangement of said indicia differ from each other.