| 摘要 |
A motion detector includes a plurality of electrically conductive spheres contained within a chamber having a height slightly greater than the sphere diameter. In a first embodiment, a top wall of the chamber consists of a circuit board having a pattern of conductive metal installed thereon including one pattern for one conductor and another pattern for another conductor with the two patterns being interrelated so that spheres rolling within the chamber can make and break electrical circuits. In a second embodiment, both the top and bottom walls of the chamber consist of circuit boards having patterns of conductive metal thereon. In either embodiment, the pattern of conductive metal may be spiral-shaped, either circular or elliptical, concentric circles or concentric ellipses, an array of dots or an array of rectangles.
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