公开(公告)号：JPH10283630A

公开(公告)日：1998-10-23

申请号：JP8609098

申请日：1998-03-31

Applicant: EMTEC MAGNETICS GMBH

Inventor： GOETZ KLAUS ,  JAKUSCH HELMUT DR ,  LOCH WERNER DR ,  HOFFMANN ERICH ,  GOTTMANN HANS-GEORG ,  JENOR HANS-JOACHIM ,  VOIT JOHANN DR

IPC: G11B5/706 ,  G11B5/716

Abstract: PROBLEM TO BE SOLVED: To obtain a magnetic recording medium with which the audible linear distortions in association with a Dolby noise suppression system are eliminated, the production is simplified and the output levels at low frequencies and high frequencies are improved. SOLUTION: This magnetic recording medium consists of a nonmagnetic base 1 and at least two magnetic layers 2, 3 formed on this nonmagnetic base 1. These two layers 2, 3 contain magnetizable metal oxides as magnetic pigments. These magnetic pigments consist of cobalt-contg. FeOx (1.33

公开(公告)号：DE19714161A1

公开(公告)日：1998-10-08

申请号：DE19714161

申请日：1997-04-05

Applicant: EMTEC MAGNETICS GMBH

Inventor： GOETZ KLAUS DIPL ING ,  GOTTMANN HANS-GEORG ,  HOFFMANN ERICH ,  JAKUSCH HELMUT DR ,  JENOR HANS-JOACHIM ,  LOCH WERNER DR ,  VOIT JOHANN DR

IPC: G11B5/706 ,  G11B5/716

Abstract: In a magnetic recording carrier having two magnetic layers, in which the upper layer contains a cobalt-containing FeOx (x = 1.33 to 1.5) magnetic pigment with a higher BET value than that of the lower layer magnetic pigment, the thicknesses of the upper and lower layers (3, 2) are 3.1-5 mu m and 1.1-3 mu m, respectively. Preferably, the coercive field strengths of the upper and lower layers are 55-60 kA/m and 50-55 kA/m respectively or, when the magnetic pigment of the lower layer is CrO2, the coercive field strength of the lower layer is 40-55 kA/m.