Title:
GLASS SUBSTRATE
Document Type and Number:
WIPO Patent Application WO/2024/034360
Kind Code:
A1
Abstract:
A circular glass substrate having a first and a second main surface facing each other and an edge between the two main surfaces and having a notch in part of the edge, wherein the specific gravity is 3.00 or more, the radius r is 75 mm or more, the refractive index nd is 1.800 or more, the ratio (Tf/Tg) of the fictive temperature Tf (°C) and the glass transition temperature Tg (°C) is less than 1.00, λ70 is 425 nm or less when the lowest wavelength at which the internal transmittance becomes 70% in the relationship of the internal transmittance to the wavelength is taken to be λ70, and the ratio (g/r) of the deviation (mm) of the center of gravity G of the glass substrate relative to the center P of the glass substrate in top view and the radius r is in the range of 0.05-1.2%.
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Inventors:
SAWAMURA SHIGEKI (JP)
KANNO NAOKI (JP)
KANNO NAOKI (JP)
Application Number:
PCT/JP2023/026793
Publication Date:
February 15, 2024
Filing Date:
July 21, 2023
Export Citation:
Assignee:
AGC INC (JP)
International Classes:
C03C3/12; C03C19/00; C03C3/15; G02B1/00; G02B5/00
Domestic Patent References:
| WO2020045417A1 | 2020-03-05 | |||
| WO2013031548A1 | 2013-03-07 | |||
| WO2019082616A1 | 2019-05-02 |
Foreign References:
| JP2018095514A | 2018-06-21 | |||
| JP2021102549A | 2021-07-15 |
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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