Abstract: A light-reflective device for determining positional information relative to an external magnetic field having a housing, a light-reflective compass assembly, a light generating and detecting assembly, a processor, and a display. The light-reflective compass assembly further includes a balanced disk magnet mounted on a compass card. The compass card includes a reflective pattern representative of the position of the housing with respect to the external magnetic field. The reflective compass assembly reflects light generated by the light generating and detecting assembly back toward the light generating and detecting assembly. The light generating and detecting assembly generates a signal representative of the position of the housing relative to the external magnetic field. The processor processes the signal received from the light generating and detecting assembly to determine the position of the housing relative to the external magnetic field and outputs the position to the display.

Abstract: An apparatus and method are disclosed for preparing electrically conductive traces on a circuit board using an additive technology. The traces are directly written in a serial process with each trace being able to be individually insulated. The apparatus includes an extrusion element for extruding a first material and a stage. The stage is for holding the extrusion element and the circuit board in relative proximity and for producing relative motion between the extrusion element and the circuit board in order to extrude the first material onto the surface of the circuit board along preselected paths to produce the electrically conductive traces. According to the method of invention, a first polymerizable material is extruded onto a circuit substrate support along preselected paths to form traces, and the first polymerizable material is polymerized, the first polymerizable material being conductive after polymerization.