Band filters for use in protective glasses

Details Band filters for use in protective glasses Band filters for use in protective glasses

1975-06-23

1977-08-30

Henry, Jon W.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351 44, 427166, G02B 528

Patent

active

040451259

ABSTRACT:
A band filter adapted to pass only a band of determined wave length of the electromagnetic spectrum and comprising a support, at least partially transparent in the considered band, covered on one of its surfaces by a filtering element constituted of three metallic layers separated respectively by two layers of transparent material. The filter can employ anti-reflection coatings and binding and adherency layers.

REFERENCES:
patent: RE27473 (1972-09-01), Mauer
patent: 2758510 (1956-08-01), Auwater
patent: 3649359 (1972-03-01), Apfel et al.

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