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  • Lens apparatus, projection type optical apparatus and projection type image display apparatus
    Patent number: 7019916
    Abstract: An optical apparatus according to the present invention has a plurality of lens units which can move in the direction of an optical axis, each of the lens units has a cam follower, a guide member which guides the each lens unit in the direction of the optical axis, and a cam member which has cams engaging with the cam followers and drives the lens units in the direction of the optical axis by rotating. The cam followers of the lens units are disposed substantially straight in the direction of the optical axis.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: March 28, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shoji Suzuki