Polarizing glass plate and method for manufacturing same, polarizing glass plate set for optical isolator, and method for manufacturing optical element for optical isolator

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United States of America Patent

PATENT NO 10202298
APP PUB NO 20170174547A1
SERIAL NO

15321320

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A method of manufacturing a polarizing glass sheet includes subjecting, while heating, a glass preform sheet containing metal halide particles to down-drawing, to thereby provide a glass member having stretched metal halide particles dispersed in an aligned manner in a glass matrix, and subjecting the glass member to reduction treatment to reduce the stretched metal halide particles, to thereby provide a polarizing glass sheet. A shape of the glass preform sheet during the down-drawing satisfies a relationship of the following expression:

description='In-line Formulae' end='lead'L1/W1≥1.0description='In-line Formulae' end='tail'

where L1 represents a length between a portion in which a width of the glass preform sheet has changed to 0.8 times an original width and a portion in which the width of the glass preform sheet has changed to 0.2 times the original width W0, and W1 represents a length equivalent to 0.5 times the original width W0 of the glass preform sheet.

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Patent Owner(s)

  • NIPPON ELECTRIC GLASS CO. LTD

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawamura, Tomoaki Shiga, JP 53 538
Takeuchi, Hirokazu Shiga, JP 53 527
Yabuuchi, Kouichi Shiga, JP 4 19

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