Abstract: The present invention provides a high-performance, thin wide-angle lens suitable for imaging elements with high pixel counts. The wide-angle lens includes, from an object side to an image plane side: a first lens group including a first lens having a negative refractive power and a second lens having a positive refractive power; and a second lens group including a third lens having a negative refractive power, a fourth lens having a positive refractive power, and a fifth lens having a positive refractive power. The fourth lens is bonded to the third lens. The fifth lens is formed with at least one of its convex surfaces being an aspherical surface.

Abstract: Disclosed is a getter assembly for a gas discharge device in which the getter assembly consists of a snap-ring wherein the snap-ring includes a depression or trough for holding the getter material. The getter assembly is intended to be placed in an opening in a gas discharge device providing the function of a getter.

Abstract: There is provided by this invention a semiconductor laser which achieves high-power operation due to full aperture emission from a broad emitting facet. The semiconductor laser's full aperture emission is enabled by the physical structure and alignment of the semiconductor layers which are deposited upon the corrugated substrate.