| 摘要 |
<p>A master disk for simultaneous recording of all information upon a thermo-magnetic recording disk, has a layer of a heating-energy-reflecting material supported by a substrate of a material substantially transparent to the form of heating energy used. The reflecting material layer is apertured at locations at which the disk-to-be-recorded is to have a bit of digital information of opposite binary value from the binary value of locations at which the reflecting layer remains intact. The master disk is placed adjacent to a recording disk previously having all domains therein magnetized in a first direction, and a beam of heating energy, such as light and the like, is directed through the master disk, in the presence of a magnetic field of direction opposite to the direction of the previous magnetization of the domains. The magnetization of domains situated under apertures in the reflecting layer is reversed, responsive to the heating energy beam and the opposite-direction external field, to rapidly write the binary information from the master disk onto the recording disk.</p> |
