Helicoid structure used to drive a lens barrel in a vari-focal a

Details Helicoid structure used to drive a lens barrel in a vari-focal a Helicoid structure used to drive a lens barrel in a vari-focal a

1997-11-24

1999-01-19

Perkey, W. B.

Photography

Having variable focal length of camera objective

359704, G03B 1700

Patent

active

058624163

ABSTRACT:
A helicoid structure is disclosed that includes a male helicoid provided on an inner barrel and a female helicoid provided on an outer barrel. The female helicoid includes long female crests having engagement ends positioned near a forward end of the outer barrel and short female crests having engagement ends positioned further from the forward end of the outer barrel. At least one of the short female crests is connected to an adjacent long female crest by a guiding crest respectively formed along a plane extending orthogonally to an axis of the outer barrel. When the inner barrel having the male helicoid is rotated relative to the outer barrel having the female helicoid in order to assemble the inner barrel into the outer barrel, the engagement ends of the male helicoid crests are guided by the guiding crests so that the inner barrel may be rotated without any linear movement relative to the outer barrel.

REFERENCES:
patent: 3142239 (1964-07-01), Meixner
patent: 5018832 (1991-05-01), Terunuma et al.
patent: 5701206 (1997-12-01), Sasaki et al.

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