Zoom lens assembly

Details Zoom lens assembly Zoom lens assembly

1992-08-07

1993-12-07

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359826, G02B 1514

Patent

active

052687945

ABSTRACT:
A zoom lens assembly for a camera includes front and rear lens assemblies and a cam assembly mounted in a cylindrical lens barrel. Rotation of the cam assembly results in axial movement of the lens assemblies and change of the focal length. The cam assembly includes discrete front and rear sections respectively defining front lens and rear lens cam surfaces. The sections are attached together with the lens assemblies captured internally. Integral projections on the front lens assembly engage the front lens cam surface and axial grooves in the barrel. Integral projections on the rear lens assembly engage the rear lens cam surface and axial grooves in the front lens assembly. A coil spring urges the lens assemblies apart and against the cam surfaces.

REFERENCES:
patent: 3744884 (1973-07-01), Filopovich et al.
patent: 4255020 (1981-03-01), Yukio
patent: 4763999 (1988-08-01), Lawther
patent: 4834514 (1989-05-01), Atsuta et al.
patent: 4993815 (1991-02-01), Yamazaki et al.
patent: 5037187 (1991-08-01), Oda et al.

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