Card reader for electronic goods ordering system, has read heads that communicate with processor through optocouplers

摘要

The read heads (28,30) and a processor (36) are arranged on opposite sides of a transparent disk (12). The read heads and processor communicate through the optocouplers (32,34). Preferably, the read head and a transmission part (32) of the optocoupler are provided with a power supply in one housing which is glued onto the disk.