What is the principle of anti-theft of library books? Not a magnetic stripe. If the whole book has no magnetic stripe label, there will be no magnetic field lines and no chips.
The present anti-theft system of the library, like the anti-theft system of the supermarket, adopts the form of bar code. In the past, putting magnetic stripes in books was a relatively backward and outdated technology, which was inefficient to use. After scanning enters the system, it needs to pass through the degaussing machine. Sometimes if the degausser is insensitive, it needs to be repeated. . .