Title:
LENS BARREL AND OPTICAL EQUIPMENT PROVIDED WITH THE SAME
Document Type and Number:
Japanese Patent JP3689493
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent optical performance from getting low because a key member for straight advancing a moving lens barrel for zooming is deformed due to the relation of the strength of material or collision at a telephoto end or a wide end in a zoom lens barrel.
SOLUTION: In the case a 2nd group moving lens barrel 8 is guided to be moved in an optical axis direction by the straight advance key 1 fixed on a fixed barrel 1 in accordance with the turning amount of a cam ring 3 rotated by the operation of a zoom operation ring 2, it is stopped by allowing either end face of the projected part 2b of the ring 2 to abut on the pillar part 1d of the fixed barrel 1 at the telephoto end for zoom operation, and the other end face of the projected part 2b to abut thereon at the wide end. Then, it is stopped by allowing a stopper part provided on the side of the cam follower 8a of the lens barrel 8 to abut on a bent part provided at the front end of the projected cam 3b of the cam ring 3 in order to prevent the key 11 from being deformed in the case the ring 2 is rotated vigorously only on the telephoto end side.
Inventors:
Tadanori Okada
Application Number:
JP18690096A
Publication Date:
August 31, 2005
Filing Date:
June 28, 1996
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B7/04; G02B7/10; (IPC1-7): G02B7/04; G02B7/10
Domestic Patent References:
| JP3075407U | ||||
| JP4083212A | ||||
| JP4104112A | ||||
| JP8146278A |
Attorney, Agent or Firm:
Keizo Nishiyama
Yuichi Uchio
Yuichi Uchio
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