Hermetic Sealing of Magneto-Optical Disks
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-29
Magneto-optical coatings used on magneto-optical thin film disks are very sensitive to oxidation and attack by water vapor. Therefore, the two glass disks, shown in the figure as a typical example of a double- sided disk, must be sealed hermetically. Unfortunately, high temperature processing above 150oC cannot be used after the magneto-optical thin film material is deposited. Sealing by epoxy resins does not work, as the gas transpiration is too high. Macro defect free (MDF) cements have outstanding strength and extremely low gas permeability. These MDF cements or new polyelectrolyte cements processed by MDF techniques, which are known to adhere well to metals and clean glass, or even combinations of the two, can be used as sealing material for the two disks.