Multi-stage extension type zoom lens barrel

Details Multi-stage extension type zoom lens barrel Multi-stage extension type zoom lens barrel

1998-05-22

2000-09-05

Mack, Ricky

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

061151890

ABSTRACT:
A zoom lens barrel includes a stationary barrel; a first rotational feed barrel which is engaged with the stationary barrel by means of helicoids; a first linear movement barrel which is engaged with the first rotational feed barrel so as to relatively rotate and to relatively move together along the optical axis and which is provided on the inner peripheral surface thereof with a female helicoid; a second rotational feed barrel which has a male helicoid and a female helicoid on the outer and inner peripheral surfaces thereof respectively; a rotational transmission barrel which is engaged with the first rotational feed barrel so as to relatively move along the optical axis and to rotate together, and which is integrally connected to the second rotational feed barrel; a second linear movement barrel which is provided on outer peripheral surface thereof with a male helicoid which engages with the female helicoid of the second rotational feed barrel; a lens group that is held by said second rotational feed barrel; and at least one lens group which is guided to linearly move independently of the second linear movement barrel.

REFERENCES:
patent: 5349475 (1994-09-01), Nomura et al.
patent: 5467227 (1995-11-01), Nomura
patent: 5659810 (1997-08-01), Nomura et al.
patent: 5774748 (1998-06-01), Ito et al.
patent: 5862416 (1999-01-01), Nishimura

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