Optics: measuring and testing – Inspection of flaws or impurities – Transparent or translucent material
Patent
1992-11-23
1994-08-30
Rosenberger, Richard A.
Optics: measuring and testing
Inspection of flaws or impurities
Transparent or translucent material
359 13, G01N 2188
Patent
active
053432886
ABSTRACT:
A system for evaluating the head-up display aperture of a vehicle windshield with respect to established optical standards, independently of the projection system with which it is to be utilized. A fixture is provided for mounting a windshield in a predetermined position. An object plate having a series of accurately spaced parallel slits therethrough is positioned so that a light source positioned behind the object plate directs a series of narrow elongated light beams corresponding to the slits against the interior surface of the windshield within the display area. A line scan camera array system scans the display area and produces signals indicative of the apparent positions of the primary and secondary images of the beams reflected by the opposite surfaces of the windshield. The signals are transmitted to and stored within a computer system as a measured data base or map. An illuminated calibration plate identical to the object plate and positioned at the ideal virtual image plane of the windshield and camera system, is similarly scanned by the line scan camera array system in the absence of a windshield. The camera produces signals indicative of the positions of the lines and transmits them to the computer system for storage as a reference or calibration data base or map.
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Cohen Brian E.
Greenberg William M.
Pagryzinski William V.
Smith Brian E.
Libbey-Owens-Ford Co.
Pham Hoa Q.
Rosenberger Richard A.
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