Neutral density (ND) filter

Details Neutral density (ND) filter Neutral density (ND) filter

1996-05-22

1998-02-03

Dzierzynski, Paul M.

Optical: systems and elements

Absorption filter

Neutral or graded density

359885, 359589, 359580, G02B 522, G02B 528, G02B 110

Patent

active

057151032

ABSTRACT:
A thin-film-type ND filter which attenuates the amount of light transmission is formed on a transparent substrate by using two or more types of metallic oxide having a refractive index n and an attenuation coefficient k which are in the range of 1.0 to 3.0 in the wavelength region of the visible region, making it possible to obtain flat transmittance characteristics.

REFERENCES:
patent: 4128303 (1978-12-01), Onoki et al.
patent: 4793669 (1988-12-01), Perilloux
patent: 4940636 (1990-07-01), Brock et al.
patent: 5246803 (1993-09-01), Hanrahan et al.

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