| 摘要 |
The present invention provides a glass sheet that has high transmission in the visible light region and, when used as a light-guide plate of an edge-light-type surface light emitter, has high luminance uniformity. The present invention pertains to a glass sheet having a first main surface and a second main surface, wherein the glass sheet is characterized in that: the glass sheet has a coefficient of the absorption of 550-nm-wavelength light of 1m-1 or less; the ratio (αmax/αmin) of the maximum value αmax (m-1) of the coefficient of the absorption of 400-700-nm-wavelength light to the minimum value αmin (m-1) is 10 or less; one or more bubbles are present inside the glass sheet; and the ratio Lmax/Lave of the maximum luminance Lmax (cd/m2) to the average luminance Lave (cd/m2) of light emitted from the second main surface when light in the visible-light wavelength region is directed from a light source toward a reference end face is such that 1≤Lmax/Lave≤1.1. |
