Optics: measuring and testing – Inspection of flaws or impurities – Transparent or translucent material
Patent
1996-09-25
1998-07-14
Hantis, K.
Optics: measuring and testing
Inspection of flaws or impurities
Transparent or translucent material
348 86, G01N 2100
Patent
active
057812888
ABSTRACT:
A method of inspecting the location of a polarization-direction changing film relative to a transparent plate at a predetermined position. The method comprises the following steps: (a) disposing a first polarizing plate to face a first surface of the transparent plate and at a standard position at which the first polarizing plate has inner and outer peripheries, in section, defining therebetween an area corresponding to a permissible range for location of a peripheral edge of the polarization-direction changing film; (b) disposing a second polarizing plate to face a second surface of the transparent plate, in which the polarization-direction changing film is located relative to the transparent plate; and (c) observing a locational relationship between the peripheral edge of the polarization-direction changing film and the area of the first polarizing plate through the second polarizing plate so as to make a judgment as to whether the peripheral edge of the. polarization-direction changing film is within the allowable range.
REFERENCES:
patent: 3187185 (1965-06-01), Milnes
patent: 5343288 (1994-08-01), Cohen et al.
Asakura Motoh
Kobayashi Kazuya
Nishikawa Shinji
Central Glass Company Limited
Hantis K.
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