Zoom lens barrel with cam ring having a helicoid surface

Details Zoom lens barrel with cam ring having a helicoid surface Zoom lens barrel with cam ring having a helicoid surface

1998-04-14

1999-06-15

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359700, G02B 1514

Patent

active

059127724

ABSTRACT:
A zoom lens barrel has a rotatable cam ring which is provided on an inner peripheral surface thereof with a female helicoid which can be engaged by a male helicoid formed on an outer peripheral surface of a lens support and a cam groove in which a cam follower pin formed on a lens frame can be fitted. At least a part of said cam groove penetrates in an area of said female helicoid in the axial direction of said cam ring. The cam ring is provided with a first area in which the female helicoid is formed and a second area separate from the first area, in which the cam groove is formed, so that the cam groove does not interfere with the female helicoid.

REFERENCES:
patent: 5231449 (1993-07-01), Nomura
patent: 5467227 (1995-11-01), Nomura
patent: 5469300 (1995-11-01), Nomura
patent: 5488513 (1996-01-01), Tanaka
patent: 5589987 (1996-12-01), Tanaka
patent: 5636064 (1997-06-01), Nomura et al.
patent: 5659810 (1997-08-01), Nomura et al.
patent: 5701208 (1997-12-01), Sato et al.
patent: 5748388 (1998-05-01), Nomura et al.

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