Barrier opening and closing mechanism

Details Barrier opening and closing mechanism Barrier opening and closing mechanism

2005-01-04

2005-01-04

Mahoney, Christopher E (Department: 2851)

Photography

Having means to reflect image to film

C396S448000

Reexamination Certificate

active

06837628

ABSTRACT:
A barrier opening and closing mechanism includes a refractive optical system having a plurality of lens elements and disposed so as to refract light substantially at right angles; a lens barrel holding the refractive optical system; a rotary cam ring disposed concentrically with the lens barrel, having a first cam groove, and rotating on an optical axis of subject light having been refracted; a lens driving mechanism driving, in a direction of the optical axis, at least one lens element included in the refractive optical system engaged with the first cam groove; and a barrier member protecting a most subject side lens element of the refractive optical system. In the barrier opening and closing mechanism, the rotary cam ring has, in a predetermined angle range on an outer surface thereof, a second cam groove including a region extending obliquely to the optical axis, a driving member is provided that has a cam follower engaged with the second cam groove and is driven in a direction substantially parallel to the optical axis, and the barrier is opened and closed by moving in response to a movement of the driving member in the predetermined angle range.

REFERENCES:
patent: 4609270 (1986-09-01), Kohno et al.
patent: 5761556 (1998-06-01), Ichino
patent: 6033130 (2000-03-01), Muroi et al.
patent: 6264380 (2001-07-01), Omiya
patent: 6278844 (2001-08-01), Takeshita
patent: 6312168 (2001-11-01), Naruse et al.
patent: 6334718 (2002-01-01), Akiba et al.

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