| 摘要 |
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. <IMAGE> |
