Process for producing a planar glass substrate coated with a dielectric layer system
First Claim
1. In a process for producing a planar glass substrate having one or more dielectric layers of optical quality, the improvement comprising heating a glass tube having one or more dielectric layers on one or both sides of said glass tube applied by chemical vapor deposition or modified chemical vapor deposition to a sufficient temperature so that the glass tube can be blown, flowing the glass tube to expand it and reduce the thickness of the dielectric layers, measuring the optical properties of the blown glass tube and continuing to expand the tube until desired optical properties are obtained, cutting the blown glass tube and heating it to its softening point, and flattening it to produce a planar glass substrate.
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Abstract
A process is provided for producing a planar glass substrate coated with a dielectric layer system in which the individual layers are formed by a chemical vapor deposition coating process. After the layers have been applied, the glass substrate is either drawn, compressed, or its surface enlarged until the coating layers are reduced in thickness. A planar glass substrate having a multiplicity of extremely thin dielectric layers can be fabricated according to this process.
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6 Claims
- 1. In a process for producing a planar glass substrate having one or more dielectric layers of optical quality, the improvement comprising heating a glass tube having one or more dielectric layers on one or both sides of said glass tube applied by chemical vapor deposition or modified chemical vapor deposition to a sufficient temperature so that the glass tube can be blown, flowing the glass tube to expand it and reduce the thickness of the dielectric layers, measuring the optical properties of the blown glass tube and continuing to expand the tube until desired optical properties are obtained, cutting the blown glass tube and heating it to its softening point, and flattening it to produce a planar glass substrate.
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