Color corrected projection lens

Details Color corrected projection lens Color corrected projection lens

1988-10-28

1990-02-13

Arnold, Bruce Y.

350463, 350412, G02B 1318, G02B 900, G02B 300

Patent

active

049001396

ABSTRACT:
A lens comprising from the image side a first lens unit which is a positive element with at least one aspheric surface; a three element lens unit consisting of a biconcave element, a biconvex element and another positive component, in that order; a third lens unit having a strongly concave image side surface and which serves as a field flattener and to correct the Petzval sum of the lens.

REFERENCES:
patent: 3446547 (1969-05-01), Jeffree
patent: 4620773 (1986-11-01), Fukuda
patent: 4682862 (1987-07-01), Moskovich
patent: 4776681 (1988-10-01), Moskovich
patent: 4810075 (1989-03-01), Fukuda
patent: 4824224 (1989-04-01), Fukuda et al.

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