Inner focus zoom lens

Details Inner focus zoom lens Inner focus zoom lens

1995-07-12

1997-09-02

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

056638353

ABSTRACT:
An inner focus zoom lens is, sequentially from an object side, constructed of a first lens unit exhibiting a negative refracting power, a second lens unit exhibiting a positive refracting power, a third lens unit exhibiting a negative refracting power and a fourth lens unit exhibiting a positive refracting power. Focusing from a long distance object to a short distance object is performed by integrally moving the second lens unit and the third lens unit toward an image-surface direction. Alternatively, an inner focus zoom lens is, sequentially from the object side, constructed of a first lens unit exhibiting a positive refracting power, a second lens unit exhibiting a negative refracting power, a third lens unit exhibiting a positive refracting power and a fourth lens unit exhibiting a positive refracting power. The focusing from the long distance object to the short distance object is effected by integrally moving the second lens unit and the third lens unit toward the image-surface direction.

REFERENCES:
patent: 4516839 (1985-05-01), Tokumaru
patent: 4591235 (1986-05-01), Tokumaru et al.
patent: 4636040 (1987-01-01), Tokumaru
patent: 4653873 (1987-03-01), Kawamura
patent: 4846562 (1989-07-01), Tokumaru et al.
patent: 5132848 (1992-07-01), Nishio et al.
patent: 5276553 (1994-01-01), Tatsuno

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