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 Barrel driving device for camera

Details
Inventors: Namai, Akihiro; Egawa, Akira; Kodaira, Takanori;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Hix; L. T.
Assistant Examiner: Brown; Brian W.
Attorney, Agent or Firm: Toren, McGeady & Associates

A barrel driving device for a camera including a distance adjusting ring having cam portions for axially moving a photographic lens barrel forward, ratchet teeth formed in the outer periphery of the distance adjusting ring, a ratchet arranged upon movement from an initial or first position to a second position to turn the distance adjusting ring in engagement with one of the ratchet teeth, and a pawl arranged upon engagement with one of the ratchet teeth to hinder the reverse movement of the distance adjusting ring, wherein there is provided a limiting member having an abutment surface against which the head of the ratchet abuts so that the ratchet is hindered from turning outwardly of the distance adjusting ring when it goes in the second position.

DETAILED DESCRIPTION An object of the present invention is to eliminate the above-described problem, and to prevent the distance adjusting ring from turning a longer distance than necessary by providing a member for hindering the ratchet from operating more than necessary.
Other objects of the invention will become apparent from the following description of embodiments thereof.



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