Objective lenses

Details Objective lenses Objective lenses

1978-09-12

1982-05-11

Buczinski, S. C.

350412, 350 49, G02B 960

Patent

active

043290248

ABSTRACT:
The invention provides an objective lens with a front lens group and a rear lens group spaced apart from the front group. The front group comprises at least two doublet components one of which is a crown positive element cemented to a flint negative element which has a higher refractive index and dispersion values than those of the crown glass. The other doublet component of the front group is a crown positive element and a flint negative element in which the flint and crown glasses have similar refractive indices but dissimilar dispersions with the flint glass having a positive red relative partial dispersion deviant.

REFERENCES:
patent: 3236151 (1966-02-01), Solisch et al.
patent: 3270616 (1966-09-01), Hopkins
patent: 3333053 (1967-07-01), Back
patent: 3658406 (1972-04-01), Karube et al.

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