Method of and apparatus for determining optical quality of an article
AssigneePPG Industries, Inc.
InventorAloysius W. Farabaugh
Life of this patent
Estimating the term…
Abstract
An interlayer material is scanned prior to laminating same with glass sheets to generate a thickness variation signal, a wedge angle signal and an optical power signal. The signals are then selectively filtered to determine the thickness variation, wedge angle and optical power of the interlayer after lamination.
Claims14
A method of determining optical property of a transparent plastic sheet defined as a worked sheet exposed to heat or pressure from a transparent plastic sheet defined as an unworked sheet prior to exposure to the heat or pressure, comprising the steps of:
- scanning the unworked sheet to generate an optical profile of the unworked sheet;
- and
- altering portions of the optical profile of the unworked sheet to provide an altered optical profile which is the expected optical profile of the worked sheet.
An electrical system for determining optical property of a transparent plastic sheet defined as a worked sheet exposed to heat or pressure from a transparent plastic sheet defined as an unworked sheet prior to exposure to the heat or pressure, comprising:
- means for scanning the unworked sheet to generate optical profile of the unworked sheet;
- and
- means operatively connected to said scanning means for altering portions of the optical profile to provide an altered optical profile which is the expected optical profile of the worked sheet.
Dependencies are inferred from the claim text.