ND filter, method for producing the ND filter, and aperture...

Details ND filter, method for producing the ND filter, and aperture... ND filter, method for producing the ND filter, and aperture...

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

06842302

ABSTRACT:
An ND filter includes a substrate formed in a plastic sheet and a deposited film formed on a surface of the substrate. The plastic sheet has at least 120° C. of a glass transition temperature. In producing the ND filter, the deposited film is formed on the surface of the substrate at a temperature below the glass transition temperature of the plastic sheet to suppress deformation due to expansion and contraction and to prevent the plastic sheet from wrinkling.

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
patent: 20030008136 (2003-01-01), Bliznyuk et al.
patent: 20040021967 (2004-02-01), Yanagi et al.
patent: 10-133253 (1998-05-01), None

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