公开(公告)号：US3671351A

公开(公告)日：1972-06-20

申请号：US3671351D

申请日：1969-06-23

Applicant: INT COMPUTERS LTD

Inventor： TIES SIDNEY

IPC: G11B5/74 ,  G11B5/84 ,  B44C1/06

CPC classification number: G11B5/84 ,  G11B5/74 ,  Y10T156/1093

Abstract: A METHOD FOR PRODUCING A MAGNETIC RECORDING MEMBER HAVING A FILM OF MAGNETIC MATERIAL WITH A HIGHLY FINISHED SURFACE ON A BACKING LAYER IS DISCLOSED. THE METHOD INCLUDES THE STEPS OF PREPARING A GLASS DISC SUCH THAT THE DISC SURFACE IS OF NEAR OPTICAL FLATNESS, DEPOSITING A FILM OF MAGNETIC MATERIAL ON THE DISC, BONDING A BACKING LAYER TO THE FILM AND STRIPPING THE GLASS DISC FROM THE FILM TO REVEAL A HIGHLY FINISHED SURFACE ON THE FILM OF MAGNETIC MATERIAL, THE FILM BEING BONDED TO THE BACKING LAYER. A TWOSIDED MAGNETIC RECORDING MEMBER MAY BE PRODUCED BY PLACING TWO THREE-LAYER STRUCTURES BACK TO BACK AND STRIPPING BOTH GLASS DISCS TO REVEAL TWO HIGHLY FINISHED MAGNETIC FILMS.