Zoom lens using elements made of plastic materials

Details Zoom lens using elements made of plastic materials Zoom lens using elements made of plastic materials

1983-10-27

1987-04-21

Corbin, John K.

G02B 1514

Patent

active

046591877

ABSTRACT:
A zoom lens with a frontmost lens group made to have the focusing function, said focusing lens group being provided with at least one member made of a plastic material. The other part of the lens system than the focusing lens group is constructed with lenses made of materials which assure that the focal length will not vary with variation of the surrounding temperature and humidity so that when focusing is followed by zooming displacement of the image plane can be prevented.

REFERENCES:
patent: 3912379 (1975-10-01), DeJager
patent: 3920315 (1975-11-01), Linke
patent: 3972592 (1976-08-01), Ruben
patent: 4557567 (1985-12-01), Azumi et al.

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