ND filter and aperture device including the same

Details ND filter and aperture device including the same ND filter and aperture device including the same

2005-01-11

2005-01-11

Boutsikaris, Leo (Department: 2872)

Optical: systems and elements

Absorption filter

Neutral or graded density

C359S885000, C396S108000

Reexamination Certificate

active

06842301

ABSTRACT:
An ND filter includes a substrate formed in a plastic sheet and a deposit film deposited on a surface of the substrate. The plastic sheet is composed of a norbornene resin and the deposit film is composed of a nickel-chromium alloy. The norbornene resin has a small thermal shrinkage factor and prevents the plastic sheet from wrinkling. The nickel-chromium alloy has a good oxidation resistance and ensures a uniform light transmittance of the deposit film over the entire visible light region.

REFERENCES:
patent: 3897140 (1975-07-01), Tuthill
patent: 5715103 (1998-02-01), Amano et al.
patent: 5726797 (1998-03-01), Zhang et al.
patent: 6671109 (2003-12-01), Kunii

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