| 摘要 |
An apparatus and method for making a wide angle light diffusing lens of the type which includes a peripherally extending lip for supporting the lens in a downwardly opening light fixture. The lens includes a downwardly and inwardly converging light translucent side walls as well as downwardly and inwardly extending end walls and which are connected together. These walls effectively form a prismatically shaped lens which permits dispersion of light from planes at a wide angle. The apparatus of the invention includes a form or mold having an upwardly extending rib on its upper surface which generally defines a lower edge of the lens and aids in defining the other edges of the prismatically shaped lens. A plastic sheet as, for example, an acrylic plastic sheet, is heated to a temperature where it softens and is somewhat flowable, moldable and bendable and which is then draped over the rib on the mold. A mold top is then disposed over the mold encapsulating the plastic sheet therein. When the sheet is cooled, it will assume the form of the wide angle light diffusing lens.
|
