公开(公告)号：US3588771A

公开(公告)日：1971-06-28

申请号：US3588771D

申请日：1967-12-14

Applicant: RCA CORP

Inventor： MARTIN DAVID F

IPC: G11B5/00 ,  G11B5/02 ,  G11B5/845 ,  H01F13/00

CPC classification number: H01F13/00 ,  G11B5/00 ,  G11B5/02 ,  G11B5/845

Abstract: A METHOD OF MANUFACTURING MAGNETIC RECORDING TAPE HAVING AT LEAST TWO TRACKS WHICH ARE TRANSVERSELY ORIENTED WITH RESPECT TO EACH OTHER COMPRISES COATING A TAPE WEB AND THEN PASSING THE WET COATING THROUGH A SPECIAL MAGNET HAVING A PAIR OF OPPOSED ZIGZAG GAPS WHICH PRODUCES A MAGNETIC FIELD HAVING LONGITUDINALLY DIRECTED AND TRANSVERSELY DIRECTED PORTIONS. THE COATING IS THEN SOLIDIFIED AND THE WEB SLIT INTO TAPES. THE MAGNET FOR ORIENTING THE MAGNETIC PARTICLES COM-

PRISES A CORE HAVING A LONGITUDINAL AXIS AND TWO SPACED CONFRONTING PORTIONS ON EACH SIDE OF THE AXIS. EACH OF THE PORTIONS HAVE TWO PIECES AND ARE SPACED TO PROVIDE A GAP OF A PREDETERMINED DISTANCE. THE GAPS DESCRIBE ZIGZAG COURSES IN THE TRANSVERSE DIRECTION TO THE AXIS AND THE GAPS ARE OPPOSED TO ONE ANOTHER. THE APPARATUS INCLUDES MEANS FOR INDUCING MAGNETIC FLUX IN EACH OF THE CONFRONTING PORTIONS.

公开(公告)号：US3162792A

公开(公告)日：1964-12-22

申请号：US1751660

申请日：1960-03-25

Applicant: RCA CORP

Inventor： HACKLEY REGINALD A ,  MARTIN DAVID F

IPC: G11B5/845

CPC classification number: G11B5/845