Optical system for copying

Details Optical system for copying Optical system for copying

1981-06-03

1983-05-24

Corbin, John K.

350475, G02B 936, G02B 1708

Patent

active

043847668

ABSTRACT:
Positive lens-negative lens type complete symmetrical lens system varies in focal length with the change of temperature. According to the invention, such change of the focal length caused by the change of temperature is compensable between the two adjoining positive and negative lenses. Furthermore, the possible displacement of focus is reduced to a value less than 0.3 mm in the temperature range at which the lens system is generally used.

REFERENCES:
patent: 3731990 (1973-05-01), Van Orden
patent: 3912379 (1975-10-01), De Jager

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