Patent ID: 7087307

Claim:
A glass sheet formed on molten tin, wherein a difference between a visible light reflectance of a surface formed in contact with the molten tin and a visible light reflectance of a surface on the opposite side thereof is not greater than 0.25%; wherein, when the glass sheet's thickness is 4 mm, a light transmittance at 540 nm wavelength is at least 91.5%, and a light transmittance of at 450 nm wavelength is at least 91.0%, and wherein after irradiating UV light for 6 hours as specified in the radiation-proofing test according to Japanese Industrial Standard (JIS) R3212, a light transmittance at 540 nm wavelength is at least 91.0% and a light transmittance at 450 nm wavelength is at least 90.5%; wherein a maximum value of tin oxide concentration in terms of SnO 2 , in the glass sheet at a depth of up to 10 μm from the surface formed in contact with the molten tin, measured by a wavelength dispersive X-ray detector (WDX) mounted to an electron probe micro-analyzer (EPMA), is not greater than 1 mass %; and wherein a maximum value of iron oxide concentration in terms of Fe 2 O 3 , in the glass sheet at a depth of up to 5 μm from the surface formed in contact with the molten tin, measured by a wavelength dispersive X-ray detector (WDX) mounted to an electron probe micro-analyzer (EPMA), is not greater than 0.2 mass %.