The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 27, 2014
Filed:
Mar. 05, 2010
Akio Koike, Chiyoda-ku, JP;
Chikaya Tamitsuji, Chiyoda-ku, JP;
Kunio Watanabe, Chiyoda-ku, JP;
Tomonori Ogawa, Chiyoda-ku, JP;
Akio Koike, Chiyoda-ku, JP;
Chikaya Tamitsuji, Chiyoda-ku, JP;
Kunio Watanabe, Chiyoda-ku, JP;
Tomonori Ogawa, Chiyoda-ku, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
The present invention relates to an optical member including a TiO-containing silica glass having: a TiOconcentration of from 3 to 10% by mass; a Ticoncentration of 100 wt ppm or less; a thermal expansion coefficient at from 0 to 100° C., CTE, of 0±150 ppb/° C.; and an internal transmittance in the wavelength range of 400 to 700 nm per a thickness of 1 mm, T, of 80% or more, in which the optical member has a ratio of variation of Ticoncentration to an average value of the Ticoncentration, ΔTi/Ti, on an optical use surface, is 0.2 or less.