Title:
LENS BARREL
Document Type and Number:
Japanese Patent JPH0483212
Kind Code:
A
Abstract:
PURPOSE:To eliminate the need for a guide cylinder and to decrease the number of components by moving a lens holding frame in the optical-axis direction by a cam cylinder which has a cam part formed at its internal-diameter part. CONSTITUTION:A key 2 is held by a fixation part 1 and extends in the optical- axis direction. When a zoom operation part 5a is rotated, the cam cylinder 5c which is coupled (integrated) by a bridge 5d turns at a fixed position. A 2nd lens holding frame 6 which is fitted inside the cam cylinder 5c is movable only in the optical-axis direction because the key 2 is fitted and a cam follower 6b holds a cam projection 5e, formed at the inner peripheral part of the cam cylinder 5c, slidably, so as the cam cylinder 5c rotates, the 2nd lens holding frame 6 moves in the optical axis direction. The cam 9c of a straight moving cylinder 9 and a cam follower 5f engage each other and the straight moving cylinder 9 moves in the optical-axis direction by the rotation of the cam cylinder 5c. As the straight moving cylinder 9, a 1st lens holding frame 8 moves for zooming. Consequently, the need for the guide cylinder is eliminated and the number of components can be decreased.
Inventors:
IIZUKA TOSHIMI
Application Number:
JP19885790A
Publication Date:
March 17, 1992
Filing Date:
July 25, 1990
Export Citation:
Assignee:
CANON KK
International Classes:
G02B7/02; G02B7/10; (IPC1-7): G02B7/02
Attorney, Agent or Firm:
Giichi Marushima (1 person outside)
Next Patent: JPH0483213