US Patent No. 9,279,954

LENS BARREL CAPABLE OF INCREASING SHOOTING MAGNIFICATION WHILE BEING MINIATURIZED, AND IMAGE PICKUP APPARATUS


Patent No. 9,279,954
Issue Date March 08, 2016
Title Lens Barrel Capable Of Increasing Shooting Magnification While Being Miniaturized, And Image Pickup Apparatus
Inventorship Tomoyuki Kudoh, Tokyo (JP)
Assignee Canon Kabushiki Kaisha, Tokyo (JP)

Claim of US Patent No. 9,279,954

4. An image pickup apparatus comprising:
an image pickup device; and
a lens barrel comprising a first cam ring that has a first cam groove and a rectilinear groove formed on an inner periphery,
a drive ring that has a second cam groove on an inner periphery and is disposed on an outer periphery of the first cam ring,
a second cam ring that is disposed on the inner periphery of the first cam ring and is caused to follow the first cam groove
and move in a direction of an optical axis by rotation of the drive ring, a first lens group that is caused to move in the
direction of the optical axis by rotation of the second cam ring following rotation of the drive ring, a second lens group
that is disposed on an image surface side of the first lens group, and a holding unit that has a follower, which is to engage
with the second cam groove, and holds the second lens group, wherein rotation of the drive ring causes the follower to follow
the second cam groove while being guided to move rectilinearly by the rectilinear groove in the direction of the optical axis,
and the follower following the second cam groove causes the holding unit to move in the direction of the optical axis,

wherein
said drive ring does not move in the direction of the optical axis,
said second cam ring is provided with a rectilinear unit in an inner periphery thereof,
the rectilinear unit moves in the direction of the optical axis integrally with said second cam ring and is rotatable relatively
to said second cam ring, and

the rectilinear unit restricts rotation of said first lens group and rectilinearly moves by a rectilinear guide of said holding
unit.