Relates to improved design of the light receiving element or the transmission of optical touch screen sensor waveguide-based, the present invention is incorporated into the body of the receiving element 1 of the converging lens or transmitting element at least. Optical device improved design is robust mechanically more, it is easy to capture touch screen assembly, is not substantially affected by the penetration of external agents and stray light. In one embodiment, the converging lens for collimating the light reciprocating the plane wave. In another embodiment, a converging lens to focus the light back and forth outside point. In another embodiment, the receiving device is provided with a diverging lens at least one further transmission or element. Waveguide and associated transmit and receive elements, preferably is provided with a polymer that can be exposure pattern formation. [Selection Figure Figure 3
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