Barcodes can be produced by feeding reel-stock media and receiving a drive signal from a printing device. The media receives, exterior of the printing device, print imaging as a barcode pattern or barcode indicia corresponding to the drive signal. Barcode-bearing media is thereby produced externally...http://www.google.com.hk/patents/US20030193530?utm_source=gb-gplus-share專利 US20030193530 - Barcode printing module
