The optical information equipped container, from reading mannered null

摘要

PROBLEM TO BE SOLVED: To provide a container added with optical information which can be changed from an unreadable state to a readable state.;SOLUTION: A black QR code Q cannot be read by an information code reader 20 in a state where a PET bottle container 10 shown in Fig. 2(A) is filled with coffee drink 12 since the contrast to background (coffee drink) is low. When the container 10 is empty as shown in Fig. 2(B), the contrast to background (white plate) is increased by placing a white plate (reflector) 14 on the back, and the black QR code can be read by the information code reader 20.;COPYRIGHT: (C)2007,JPO&INPIT