All plastic projection lens assembly with aspheric surface

Details All plastic projection lens assembly with aspheric surface All plastic projection lens assembly with aspheric surface

1978-06-12

1980-12-23

Evans, F. L.

350175NG, 350223, G02B 304, G02B 934

Patent

active

042407010

ABSTRACT:
An all plastic lens assembly having a lens cell or housing and at least four separate airspaced lens elements mounted in the cell or housing, the lens elements are formed of plastic and at least one of the lens elements has an aspheric surface.

REFERENCES:
patent: 3205774 (1965-09-01), Estes
patent: 3361512 (1968-01-01), Fuller
patent: 3423146 (1969-01-01), Weavar
patent: 3516735 (1970-06-01), Goodell
patent: 3998527 (1976-12-01), Ikeda
patent: 4015897 (1977-04-01), Konoma et al.
patent: 4035063 (1977-07-01), Ikeda
patent: 4060312 (1977-11-01), Linke et al.

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