Zoom lens drive mechanism

Details Zoom lens drive mechanism Zoom lens drive mechanism

1993-03-22

1994-04-19

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359814, 359823, 354286, 352140, G02B 1514

Patent

active

053051491

ABSTRACT:
A zoom lens drive mechanism, for translationally driving and positionally locating a lens subgroup of a zoom lens to a zooming position along an optical axis of the zoom lens, comprises a base ring member having an aperture concentrically defined about the optical axis of the zoom lens and a drive ring member rotatably mounted on the base member for concentric rotation about the optical axis with axial constraint. A translatable lens subgroup ring member is suspended concentrically from the base and drive ring members by means of rods independently coupled at first ends thereof to the base and drive ring members and joined at second ends thereof to a common pivot point on the translatable ring member. Alternative split ball joint arrangements are described for coupling the suspension rods to the translatable ring member.

REFERENCES:
patent: 3405991 (1968-10-01), Seedhouse
patent: 4081812 (1978-03-01), Flother
patent: 4290684 (1981-09-01), Hines
patent: 4291958 (1981-09-01), Frank et al.
patent: 4796974 (1989-01-01), Brakenhoff
patent: 5058993 (1991-10-01), Wakugawa

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