Band filters for use in protective glasses

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks


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351 44, 427166, G02B 528




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.

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


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