Magnetic tape and magnetic tape cartridge
First Claim
1. A magnetic tape comprising a non-magnetic support, a primer layer containing non-magnetic powder formed on a surface of the non-magnetic support, a magnetic layer containing magnetic powder formed on the upper surface of the primer layer, and a backcoat layer containing non-magnetic powder formed on the other surface of the non-magnetic support, characterized in that the magnetic powder comprises needle-like iron-based magnetic particles, the thickness of the magnetic layer is 0.09 μ
- m or less, and the non-magnetic powder in the primer layer comprises plate-like non-magnetic oxide particles with an average particle size of 10 to 100 nm.
1 Assignment
0 Petitions
Accused Products
Abstract
There is provided a magnetic tape comprising a non-magnetic support, and a primer layer and a magnetic layer both formed on a surface of the non-magnetic support, and a backcoat layer formed on the other surface of the non-magnetic support, wherein the magnetic layer contains magnetic powder which comprises needle-like iron-based magnetic particles, and has a thickness of 0.09 μm or less; and the primer layer contains non-magnetic powder which comprises plate-like non-magnetic oxide particles with an average particle size of 10 to 100 nm. Further, the thermal expansion coefficient of the magnetic layer in the tape widthwise direction is (0 to 8)×10−6/° C., and the humidity expansion coefficient of the magnetic layer in the tape widthwise direction is (0 to 10)×10−6/% RH; and the amount of edge weave which is formed on either of the edges of the tape serving as the side of reference for the feeding of the tape is 0.8 μm or less. This magnetic tape is excellent in performance for recording/reproducing signals with short wavelengths and hardly causes a decrease in reproducing output due to off-track.
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Citations
13 Claims
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1. A magnetic tape comprising a non-magnetic support, a primer layer containing non-magnetic powder formed on a surface of the non-magnetic support, a magnetic layer containing magnetic powder formed on the upper surface of the primer layer, and a backcoat layer containing non-magnetic powder formed on the other surface of the non-magnetic support, characterized in that
the magnetic powder comprises needle-like iron-based magnetic particles, the thickness of the magnetic layer is 0.09 μ - m or less, and
the non-magnetic powder in the primer layer comprises plate-like non-magnetic oxide particles with an average particle size of 10 to 100 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11, 12, 13)
- m or less, and
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8. A magnetic tape comprising a non-magnetic support, a primer layer containing non-magnetic powder formed on a surface of the non-magnetic support, a magnetic layer containing magnetic powder formed on the upper surface of the primer layer, and a backcoat layer containing non-magnetic powder formed on the other surface of the non-magnetic support, characterized in that
the magnetic powder comprises needle-like iron-based magnetic particles, the thermal expansion coefficient of the magnetic layer in the tape widthwise direction is (0 to 8)× - 10−
6/°
C., and the humidity expansion coefficient of the magnetic layer in the tape widthwise direction is (0 to
10)×
10−
6/% RH, andthe amount of edge weave which is formed on either of the edges of the tape serving as the side of reference for the feeding of the tape is 0.8 μ
m or less. - View Dependent Claims (9)
- 10−
Specification