Three-element projection lenses

Details Three-element projection lenses Three-element projection lenses

1974-01-09

1976-02-03

Smith, Alfred E.

G02B 904

Patent

active

039361551

ABSTRACT:
A triplet-type three element lens comprises three lens elements made of substantially the same optical glass. The glass may be crown glass having an Abbe number greater than 50, a refractive index of less than 1.535 and a specific gravity of less than 2.7. The lens may be symmetrical comprising front and rear planoconvex lenses and a central biconcave lens.

REFERENCES:
patent: 540122 (1895-05-01), Taylor
patent: 1937168 (1933-11-01), Repp
patent: 3408135 (1968-10-01), Appeldorn et al.
patent: 3773404 (1973-11-01), Moore

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