Patent ID: 9304281
Filing Date: 2016-04-05
CPC Classification: G02B,G03B,H04N

Claim Text:
1. A lens device, comprising: a lens barrel configured to accommodate an image-formation optical system including at least one movable optical element, the lens barrel including an operation ring provided to be rotatable about an optical axis of the image-formation optical system to adjust the movable optical element; and a drive unit including a drive part configured to rotatably drive the operation ring, the drive unit being detachably fixed to a predetermined portion on an outer circumference of the lens barrel, wherein: the drive unit moves in relation to the lens barrel in a direction of the optical axis to be attached to or detached from the lens barrel, the operation ring and the drive unit are respectively provided with engaging parts, wherein, when the operation ring is at a predetermined rotation angle about the optical axis, the engaging parts being configured to be engaged with each other during the attachment or detachment of the drive unit in relation to the lens barrel to allow the attachment or detachment of the drive unit, the image-formation optical system includes a plurality of movable optical elements, a plurality of operation rings is provided to correspond to the plurality of movable optical elements, respectively, and the engaging part of each of the operation rings is aligned in the direction of the optical axis when each of the operation rings is at the predetermined rotation angle.