1. Field of the Invention
The present invention relates to a clasp utilizing the attraction of a permanent magnet, and more particularly to obviating such inconveniences as disruption of magnetic records by magnetic flux from such clasps by preventing the flux lines of the magnet from leaking externally.
2. Description of the Prior Art
There have been proposed various clasps which utilize the attraction of a permanent magnet, and almost all of them are conventionally aimed at effectively using the magnetic attraction of a permanent magnet rather than taking counter-measures to prevent disruption of magnetic records by the permanent magnet.
As great innovations have been achieved in the recording technology recently and magnetic recording means such as tapes, cards or notes have become household items, safeguarding those means demands special attention and care.
We have entered an era where articles having magnetic records are used daily, such as various magnetic tapes and magnetic disks to tickets for transportation, admission tickets, or cash cards for bank accounts.
The content of such magnetic records as recording tapes, etc., however, can be lost because they are easily destroyed when placed under the influence of the magnetic flux lines of a magnet and the occurrence of such a disruption can not easily be observed from outside appearance.