Magnetic recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsKiyomi Ejiri, Hiroo Inaba, Shinji Saito, Satoru Hayakawa
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AssigneeFuji Photo Film Co., Ltd.
InventorsKiyomi Ejiri, Hiroo Inaba, Shinji Saito, Satoru Hayakawa
Estimating the term…
A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising a binder having dispersed therein a ferromagnetic powder which has been coated on said lower non-magnetic layer while the lower non-magnetic layer is wet, wherein the upper magnetic layer has an average dry thickness (d) of not more than 1.0 .mu.m and an average thickness variation (.sup..DELTA. d) at the interface between the upper magnetic layer and lower non-magnetic layer is not more than d/2. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.
A magnetic recording medium, comprising a flexible support having provided thereon, at least a lower layer comprising a binder and a non-magnetic powder component dispersed therein and an upper magnetic layer comprising a binder and an acicular ferromagnetic powder dispersed therein which is coated over the lower layer while the lower layer is in a wet state, wherein said upper magnetic layer has an average dry thickness (d) in a range of from 0.05 to 0.8 um and a thickness variation (.sup..DELTA. d) at the interface between said upper magnetic layer and lower layer of not more than d/2, and said non-magnetic powder component comprises an inorganic powder having a Mohs hardness of not less than 3 and an average particle size of not more than 1/3 the major axis length of said acicular ferromagnetic powder in the upper magnetic layer.
Dependencies are inferred from the claim text.