| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary pattern display device for a pattern combining game machine which can suppress oscillation caused by the rotation and is improved in energy saving effect. SOLUTION: This device changes the display of patterns by supplying a motor-drive voltage VM to a motor coil L1 (the same with other motor coils L2 and the like) with a transistor TR1 turned on with a mutual excitation signal ϕ1. The electric current blowing through the motor coil L1 is automatically controlled so that a feed back voltage VF detected by a resistance R8 and the reference voltage VR preliminarily set at the optimum voltage by a D/A converter according to digital control signals from a microcomputer are inputted to and compared by a comparator IC1 and TR6, TR5 are turned on/off by the output thereof the keep the feed back voltage VF at the value same as the reference voltage VR. Hysteresis properties are given to the comparator IC1 by a resistance 7 to prevent oscillation. |
