Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1976-03-22
1977-12-27
Bashore, S. Leon
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 33, 65 30R, 65 37, 65 60C, 65 61, C03C 1500, C03B 1108, C03C 1900
Patent
active
040652831
ABSTRACT:
Glass-based soft-edged aperture filters having good thermal stability are produced by diffusing a coloring element such as Ag into a glass, thus providing a transmittance gradient in the colored portion thereof. A glass composition comprising a basic glass, such as a silicate, borosilicate or phosphate glass, and 1 to 10% by weight of As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3 is especially suitable for producing such soft-edged aperture filters.
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Asahara Yoshijuki
Izumitani Tetsuro
Bashore S. Leon
Hoya Glass Works, Ltd.
Miga Frank W.
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