Magnification changing lens

Details Magnification changing lens Magnification changing lens

1990-08-31

1992-01-07

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359686, 359676, G02B 1500

Patent

active

050784811

ABSTRACT:
This specification discloses a magnification changing lens which has, in succession from the object side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of negative refractive power and a fourth lens unit of positive or negative refractive power and in which at least the second and third lens unit are moved toward the object side to thereby accomplish the magnification change from the wide angle end to the telephoto end. This magnification changing lens particularly satisfies the following condition:

REFERENCES:
patent: 3771853 (1973-11-01), Nakamura
patent: 4591235 (1986-05-01), Tokumaru et al.
patent: 4653873 (1987-03-01), Kawamura
patent: 4846562 (1989-07-01), Tokumaru et al.

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