Method for producing optical polarizing elements
Abstract
Abstract OPTICAL POLARIZING ELEMENTS ARE PRODUCED BY CUTTING FROM A RIGID SHEET OF POLARIZING PLASTIC MATERIAL, SCREENS OF APPROPRIATE FROM WITH SUITABLE AXIAL DIRECTION. THESE SCREENS ARE THEN CURVED UNDER VACCUM WHEN HOT. THE CURVED SCREENS ARE COATED WITH AN ATTACHMENT VARNISH AND THEN PLACED IN A MOLD WHICH IS FILLED WITH A POLYMERIZABLE OR POLYCONDENSABLE LIQUID RESIN. IF THE SCREEN IS OF HIGHER SPCIFIC GRAVITY THAN THE RESIN THEN THE CURVATURE OF THE SCREEN WILL BE LESS THAN THAT OF THE RESIN; WHILE IF TGE SCREEN IS OF LOWER SPECIFIC GRAVITY THAN THE RESIN, THEN THE SCREEN IS MORE SHARPLY CURVED THAN THE MOLD, SO THAT IN EITHER EVENT THE SCREEN FALLING OR RISING THROUGH THE RESIN WILL CONTACT THE MOLD ONLY ABOUT THE EDGES OF THE SCREEN.
Inventors
- 👤 C Ortlieb
Bibliographic Details
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