Abstract: A seal is formed by compressing a cured layer of a composition applied on a substrate. The composition is any liquid, liquefiable, or mastic, which, after application to a surface, is converted or cured to a compressible solid film. The composition includes a flexible polymer as a binding material. The layer on the substrate eliminates the need for a gasket on a contact surface of a mold. The contact surface of the mold compresses the layer during an encapsulation process. The layer remains on the substrate in a finished product. A minimum separation or wall thickness of the mold is defined by the material properties of the mold. The seal eliminates yield loss due to leakage of an encapsulant and reduces maintenance costs associated with the procurement and repeated installation of gaskets on mold tooling.

Abstract: In one embodiment, a lens has an object surface and an image surface, with the shape of the image surface being defined by an equation having a conic component and a cone component. The lens may be incorporated into an optical receiver having a photodetector that is positioned to receive light emitted from the image surface of the lens. In some uses, the image surface of the lens mitigates return loss through the lens.