Zoom lens

Details Zoom lens Zoom lens

1993-03-08

1995-05-09

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359676, 359684, G02B 1514

Patent

active

054145627

ABSTRACT:
A compact zoom lens with a high magnification ratio composed of, from an object side, a first lens group having a positive refractive power provided at a fixed position; a second lens group having negative refractive power including a meniscus single lens, the convex surface of which faces the object side, a biconcave single lens and a positive single lens, being movable along the optical axis in accordance with a change of magnification; a third lens group having a positive refractive power, including a lens having a weak refractive power with at least one aspherical surface, provided at a fixed position; a fourth lens group having a positive refractive power, being movable in accordance with a change of magnification; and a fifth lens group having a weak refractive power provided at a fixed position.

REFERENCES:
patent: 5299064 (1994-03-01), Hamano et al.
English-language Abstract, Japanese Patent Publication Open to Public Inspection No. 4-13109 (Jan. 17, 1992).

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