Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

1992-02-14

1994-06-28

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359715, G02B 1514, G02B 1318

Patent

active

053252357

ABSTRACT:
The present invention relates to a compact zoom lens system having a long back focus and a zoom ratio of about 1.7, which comprises a first lens unit G1 having a positive focal length, a second lens unit G2 having a positive focal length and a third lens unit G3 having a negative focal length, said first, second and third lens units G1, G2 and G3 being all movable toward the object side during zooming from the wide angle to telephoto side such that the first and second lens units G1 and G2 are spaced away from each other, while the second and third lens units G2 and G3 are moved toward each other, and is characterized by conforming to the following conditional formula:

REFERENCES:
patent: 4726668 (1988-02-01), Nakayama et al.
patent: 5002373 (1991-03-01), Yamanashi
patent: 5069536 (1991-12-01), Ogata
patent: 5087988 (1992-02-01), Nakayama
patent: 5148321 (1992-09-01), Goto et al.

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