| 摘要 |
A multi-layer composite screen (1) having filters of a plurality of layers superposed one upon another is provided. Each filter (2, 3) of the plurality of layers has wires (4, 6) of a substantially triangular or trapezoidal cross section arranged in parallel to one another with a continuous slit (5, 7) of a substantially V-shaped cross section being formed between respective adjacent wires, said slit widening increasingly inwardly from the surface (4a) of the screen. The wires (4) of one filter (2) of the respective adjacent filters cross the wires (6) of the other filter (3) and the respective adjacent filters (2, 3) are fixed to each other at crossing points of the wires of the respective filters. In one aspect of the invention, the wires (6) of the lower layer are formed with linear projections (8) extending in the longitudinal direction of the wires which facilitate electrical welding of the filters of the adjacent layers. <IMAGE> |
