Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-08-01
2006-08-01
Mack, Ricky (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S694000
Reexamination Certificate
active
07085074
ABSTRACT:
A lens barrel includes a lens-holding cylinder which supports a lens and is provided with a cam-follower and a rectilinear key; a cam-cylinder having a cam-groove which engages with the cam-follower so as to apply a driving force to the lens-holding cylinder in the optical-axis direction; and a guide cylinder which is enclosed by the cam-cylinder and has a rectilinear guide opening that engages with the rectilinear key so as to guide the lens-holding cylinder in the optical-axis direction. A segment of the cam-cylinder adjacent to an object to be photographed has a greater wall thickness such that the cam-cylinder has a level difference. A portion of the guide cylinder adjacent to an object to be photographed, which corresponds to the level difference of the cam-cylinder, is made thinner by the amount of the level difference.
REFERENCES:
patent: 5410432 (1995-04-01), Kobayashi
patent: 5515135 (1996-05-01), Katayama et al.
patent: 5587754 (1996-12-01), Katayama et al.
patent: 5602607 (1997-02-01), Kato et al.
patent: 6437924 (2002-08-01), Azegami
patent: 2002-277711 (2002-09-01), None
Fitzpatrick ,Cella, Harper & Scinto
Hasan M.
Mack Ricky
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