Zoom lens focusing system

Details Zoom lens focusing system Zoom lens focusing system

1980-07-28

1984-07-17

Corbin, John K.

350453, G02B 964, G02B 1312, G02B 1518

Patent

active

044602510

ABSTRACT:
A zoom lens system in which aberration degradation due to focusing to a closer position, particularly a rapid increase in distortion of the focused image at the peripheral image field, is well compensated for. The lens system includes, from the object side, a first convergent lens component, a second convergent lens component, either a third convergent or divergent lens component and a fourth convergent lens component with the second and third components being movable for zooming. An afocal region is provided either in the space between the third and fourth lens components or within the fourth lens component.

REFERENCES:
patent: 3659921 (1972-05-01), Hirose et al.
patent: 3679292 (1972-07-01), Motoaki
patent: 3751136 (1973-08-01), Kirchhoff
patent: 3884555 (1975-05-01), Suwa et al.
patent: 3990785 (1976-11-01), Hirose
patent: 4015895 (1977-04-01), Hirose
patent: 4054371 (1977-10-01), Yasukuni
patent: 4298251 (1981-11-01), Hartmann

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