Patent ID: 7494728
Filing Date: 2009-02-24
Classification: G11B

Abstract:
1. A magnetic tape comprising a non-magnetic support, a magnetic layer containing a magnetic powder which is formed on one side of the non-magnetic support, wherein said magnetic powder comprises plate or granular magnetic particles with a particle diameter of 5 to 50 nm, and a thickness of said magnetic layer is 0.01 μm to 0.05 μm, a primer layer containing non-magnetic powder which is formed between the non-magnetic support and the magnetic layer, and a backcoat layer containing non-magnetic powder which is formed on the other side of the non-magnetic support, wherein the coefficient of temperature expansion in the tape widthwise direction is (0 to 8) ×10 −6 /° C., and the coefficient of humidity expansion in the tape widthwise direction is (0 to 10) ×10 −6 /%RH; wherein the amount of edge weave present on either edge of the magnetic tape as the reference side for the running of the tape is less than 0.8 μm; and wherein a rate of fluctuation in reproducing output in at least one of a tape lengthwise direction and a tape widthwise direction is 10% or less.