OBJECT IDENTIFYING APPARATUS

摘要

There is disclosed object identifying apparatus for an object carrying an identifying label having an identifying electrical circuit and moving or being moved through a region where the identifying circuit is read. Typically, the object is a mail sack or baggage which is to be directed along a predetermined path. When the object moves through the region, the label is randomly positioned in the region. A substantially homogeneous electromagnetic field is produced in the region and as the object moves through the region, the circuit on the label is powered by, and reacts with, the field, absorbing energy from the field. The circuit on the label includes counter elements such, as a chain of multivibrators which are flopped from OFF to ON in predetermined succession. A circuit is connected to the field which differentiates the energy absorbed by the flopping of the multivibrators responding to the changes in the conduction of the multivibrators. A succession of pulses are thus produced which serve as a code to identify the object.