Abstract: An optical imaging lens adapted to limited working distance is disclosed. The optical imaging lens includes a first, a second, a third, a fourth, a fifth, a sixth lens elements and an image sensing element sequentially along an optical axis from an object-side to an image-side. The first to the sixth lens element each includes an object-side surface facing toward an object-side as well as an image-side surface facing toward an image-side. The first lens element is a wide-angle lens element. The second to the sixth lens element are a combination of aspherical lens element, molded glass lens element, and free-form surface lens element. A field of view of the optical imaging lens is greater than or equal to 100 degrees, and the optical imaging lens is a wide-angle lens.

Abstract: A polyurethane prepolymer composition is provided. The polyurethane prepolymer composition includes a first prepolymer, a second prepolymer and a third prepolymer. The first prepolymer includes a polyol and diisocyanates. The two ends of the polyol are connected with the diisocyanates. The second prepolymer includes a diisocyanate monomer. The third prepolymer includes a first diisocyanate, polyols and second diisocyanates. The two ends of the first diisocyanate are connected with the polyols. The other ends of the polyols are connected with the second diisocyanates. A polyurethane elastomer and a preparation method thereof are also provided.

Abstract: The disclosure provides a Butler Matrix. The Butler Matrix includes: a plurality of couplers having a circuit of a cuboid structure, a plurality of crossover lines, a plurality of three-dimensional crossover lines having a three-dimensional structure, and a plurality of phase shifters. The phase shifters, the crossover lines, and the three-dimension crossover lines are been coupled between one of the couplers and the other of the couplers.

Abstract: The disclosure provides a Butler Matrix. The Butler Matrix includes: a plurality of couplers having a circuit of a cuboid structure, a plurality of crossover lines, a plurality of three-dimensional crossover lines having a three-dimensional structure, and a plurality of phase shifters. The phase shifters, the crossover lines, and the three-dimension crossover lines are been coupled between one of the couplers and the other of the couplers.

Abstract: In a SECS-to-XML message converting method and apparatus, SECS messages transacted in a semiconductor equipment system are parsed into sets of SECS items that are subsequently coded. Coded SECS items of the SECS messages from a semiconductor equipment are paired with the coded SECS items of the SECS messages from a tool control unit and corresponding to preset items of interest SECS items corresponding to the preset items of interest according to the dependency thereof. The paired coded SECS items are then converted into XML messages.