Lens barrel

Details Lens barrel Lens barrel

2007-05-24

2008-10-14

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S699000, C359S694000, C359S819000, C359S823000

Reexamination Certificate

active

07436602

ABSTRACT:
A lens barrel includes a helicoid ring provided with a helicoid; a retractable rotational ring which is guided by the helicoid to move along an optical axis while rotating, wherein the retractable rotational ring includes a pair of split retractable rotational rings which are supported so as to integrally rotate and to be relatively movable in the optical axis direction with respect to each other; first and second slide-engaging portions provided on one and the other of the pair of split retractable rotational rings, wherein the first and second slide-engaging portions are slidably engaged with the helicoid; and a biasing device which biases the pair of split retractable rotational rings in opposite directions in the optical axis direction so that the first and second slide-engaging portions are pressed in opposite directions against an opposing pair of first and second guide surfaces, respectively, of the helicoid of the helicoid ring.

REFERENCES:
patent: 4012124 (1977-03-01), Toda et al.
patent: 4272174 (1981-06-01), Teramoto et al.
patent: 5268794 (1993-12-01), Chan
patent: 5386740 (1995-02-01), Nomura et al.
patent: 5485315 (1996-01-01), Nomura et al.
patent: 6064533 (2000-05-01), Kenin et al.
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patent: 6115190 (2000-09-01), Hirai
patent: 6195212 (2001-02-01), Miyamoto
patent: 7079762 (2006-07-01), Nomura
patent: 7265918 (2007-09-01), Sasaki
patent: 2001/0024573 (2001-09-01), Nomura et al.
patent: 2002/0039241 (2002-04-01), Nomura et al.
patent: 2003/0081325 (2003-05-01), Nomura et al.
patent: 1133014 (1989-05-01), None
patent: 593835 (1993-04-01), None
patent: 11119079 (1999-04-01), None
patent: 2004170961 (2004-06-01), None
English language translation of JP 01-133014, May 25, 1989.
English language Abstract and translation of JP 11-119079, Apr. 30, 1999.

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