MAGNETIC TAPE AND MAGNETIC RECORDING AND REPRODUCING DEVICE

• Main Authors: OZAWA EIKI, KUROKAWA TAKUTO
• Format: Patent
• Language: English; Japanese
• Published: 12.02.2021
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

To suppress degradation in travelling stability due to temperature changes from a low temperature to a high temperature under high humidity conditions in a magnetic tape having increased surface smoothness of a back coating layer.SOLUTION: A magnetic tape is provided, including a magnetic layer comprising a ferromagnetic powder and a binder on one surface side of a nonmagnetic support and a back coating layer comprising a nonmagnetic powder and a binder on the other surface side of the nonmagnetic support, in which a center line average surface roughness Ra measured regarding the surface of the back coating layer is 7.0 nm or less, and a difference between a spacing Safter measured by optical interferometry regarding the surface of the back coating layer after methyl ethyl ketone cleaning and a spacing Sbefore measured by optical interferometry regarding the surface of the back coating layer before methyl ethyl ketone cleaning is greater than 0 nm and 30.0 nm or less. A magnetic recording and reproducing device including the magnetic tape is also provided.SELECTED DRAWING: None 【課題】バックコート層の表面平滑性を高めた磁気テープにおいて高湿下での低温から高温への温度変化に起因する走行安定性の低下を抑制すること。【解決手段】非磁性支持体の一方の表面側に強磁性粉末および結合剤を含む磁性層を有し、他方の表面側に非磁性粉末および結合剤を含むバックコート層を有する磁気テープであって、上記バックコート層の表面において測定される中心線平均表面粗さＲａは７．０ｎｍ以下であり、かつ上記バックコート層の表面においてメチルエチルケトン洗浄後に光学干渉法により測定されるスペーシングＳａｆｔｅｒとメチルエチルケトン洗浄前に光学干渉法により測定されるスペーシングＳｂｅｆｏｒｅとの差分は０ｎｍ超３０．０ｎｍ以下である磁気テープ。この磁気テープを含む磁気記録再生装置。【選択図】なし