Glass plate and heater using same
AssigneeAsahi Glass Company, Limited
InventorsJunko MIYASAKA, Suguru MURAYAMA, Seiki OHARA, Manabu NISHIZAWA
Life of this patent
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Abstract
To provide a glass plate which is hardly broken and which has a high infrared transmittance. A glass plate, which has a thickness of from 1 to 8 mm, has an infrared transmittance T3000 at a wavelength of 3,000 nm of at least 4%, an average thermal expansion coefficient a at from 50 to 350° C. of from 15 to 35×10−7/° C., and a glass composition comprising, as represented by mol% based on oxides, from 50 to 85% of SiO2, from 0.1 to 25% of Al2O3, from 0.1 to 20% of B2O3, from 0 to 20% in total of at least one member selected from MgO, CaO, SrO, BaO and ZnO, and from 0 to 20% in total of at least one member selected from Li2O, Na2O and K2O.
Claims13
A glass plate, which has a thickness of from 1 to 8 mm,
- an infrared transmittance T3000 at a wavelength of 3,000 nm of at least 4%,
- an average thermal expansion coefficient a at from 50 to 350° C. of from 15×10−7 to 35×10−7/° C., and
- a composition comprising, as represented by mol % based on oxides:
- SiO2:
- 50 to 85%,
- Al2O3:
- 0.1 to 25%,
- B2O3:
- 0.1 to 20%,
- MgO+CaO+SrO+BaO+ZnO:
- 0 to 20%, and
- Li2O+Na2O+K2O:
- 0 to 20%.
A heater comprising a top surface on which an object to be heated is to be placed, and an infrared sensor, the top surface being composed of a glass plate,
- wherein the glass plate has a thickness of from 1 to 8 mm,
- an infrared transmittance T3000 at a wavelength of 3,000 nm of at least 4%,
- an average thermal expansion coefficient a at from 50 to 350° C. of from 15×10−7 to 35×10−7/° C., and
- a composition comprising, as represented by mol % based on oxides:
- SiO2:
- 50 to 85%,
- Al2O3:
- 0.1 to 25%,
- B2O3:
- 0.1 to 20%,
- MgO+CaO+SrO+BaO+ZnO:
- 0 to 20%, and
- Li2O+Na2O+K2O:
- 0 to 20%.
Dependencies are inferred from the claim text.