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US 6,607,156 B2Granted
Magnetic tape cassette
AssigneeFuji Photo Film Co., Ltd.
InventorsNaoto Murao, Hiroaki Araki, Tomohiro Ichikawa
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AssigneeFuji Photo Film Co., Ltd.
InventorsNaoto Murao, Hiroaki Araki, Tomohiro Ichikawa
Estimating the term…
A 2 reel type data storage magnetic tape cassette (20) is provided with reels (28, 30) around which a magnetic recording medium (26) is wound. The magnetic recording medium (26) includes a support, a non-magnetic layer comprising a non-magnetic powder and a binder on one surface of the support, a magnetic layer comprising a ferromagnetic metal powder and a binder on top of the non-magnetic layer, and a back layer comprising a carbon black powder and a binder on the other side of the support. The magnetic tape cassette (20) is further provided with a rotating guide roller (36) made of a resin within the cassette (20). The rotating guide roller (36) has a ten-point average roughness Rz of 3.0 to 4.5 μm and is in contact with the surface of the magnetic layer having a center plane average roughness SRa of 2.0 to 3.5 nm.
A magnetic tape cassette of a two reel type comprising a reel around which a magnetic recording medium is wound, the magnetic recording medium comprising a support, a non-magnetic layer comprising a non-magnetic powder and a binder on one surface of the support, a magnetic layer comprising a ferromagnetic metal powder and a binder on top of the non-magnetic layer, and a back layer comprising a carbon black powder and a binder on the other side of the support, said magnetic tape cassette further comprising:
Dependencies are inferred from the claim text.