Lens system with plastic lenses compensating for temperature cha

Details Lens system with plastic lenses compensating for temperature cha Lens system with plastic lenses compensating for temperature cha

1983-01-05

1985-12-10

Corbin, John K.

350475, 350469, G02B 704

Patent

active

045575673

ABSTRACT:
In a zoom lens system with plastic lenses, shifting of an image forming plane of the zoom lens caused by resultant deformation and optical characteristic changes due to temperature changes of plastic single lenses and of plastic lenses included in compound lenses in the zoom lens system is corrected by a compound lens of a plastic lens and a glass lens cemented together or by a compound lens of a plastic lens and a glass lens spaced apart from each other with a slight air gap between opposing surfaces thereof of substantially the same radius of curvature, the compound lens having a temperature change dependent shifting of image forming plane to correct that of other plastic lenses.

REFERENCES:
patent: 3912379 (1975-10-01), DeJager

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