| 摘要 |
<p>Apparatus for detecting the angular position of a fruit machine reel, has magnets (50-54) and Hall devices (16-20) arranged in pairs and fixed. A coding disc (14) rotates with the reel (10) and has code elements (21) which pass between the various magnet and Hall device pairs. The elements (21) are either metal slugs (55) in a dielectric disc or apertures (56) in a metal disc and shunt magnetic field to effect coded switching of the Hall devices. A ferro-magnetic U-shaped bracket (27) provides a return path shunt for the magnets enhancing field strength at the Hall devices.</p> |
