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US 2014/0152914 A1Published application
Low-Fe Glass for IR Touch Screen Applications
AssigneeCorning Incorporated
InventorJeffrey Stapleton King
Life of this patent
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Abstract
A high optical transmittance glass for use in electronic touch screen applications is disclosed. The glass materials are principally directed to use in frustrated total internal reflection applications. The glass compositions are composed of either low concentrations of light-absorbing compounds or have low levels of scattering centers to minimize the amount of light attenuation as the light propagates through the material.
Claims20
A high optical transmittance glass comprising:
- a. less than 10 imperfections per cm3, wherein
- i. the imperfection comprises an inclusion or bubble;
- and
- ii. the size of the imperfection is less than about 100 μm along the axis of the longest dimension of the imperfection;
- or
- b. less than 200 ppm Fe2O3;
- and
- c. the absorption coefficient of the glass is less than 2.0 m−1 at 900 nm;
- and
- d. the absorption coefficient of the glass is less than 2.0 m−1 from about 400 to about 800 nm.
7 more elements
Dependencies are inferred from the claim text.