Magnetic recording medium having a dimensional variation
摘要
說明書
The elastic limit value σMD in the longitudinal direction of the magnetic recording medium 10 is preferably 0.8 [N]≤σMD. When the elastic limit value σMD falls within the range mentioned above, the width change of the magnetic recording medium 10 can be further reduced by adjusting the tension in the longitudinal direction of the magnetic recording medium 10 with the recording/reproducing device. Furthermore, the drive side is easily controlled. The upper limit value of the elastic limit value σMD in the longitudinal direction of the magnetic recording medium 10 is not particularly limited, but σMD≤5.0 [N], for example. The elastic limit value σMD is preferably not dependent on the velocity V in making the elastic limit measurement. This is because the elastic limit value σMD is not dependent on the velocity V mentioned above, thereby making it possible to reduce the width change of the magnetic recording medium 10 in an effective manner, without being affected by the running speed of the magnetic recording medium 10 in the recording/reproducing device, or the tension adjustment speed and responsiveness of the recording/reproducing device. The elastic limit value σMD is set to a desired value, depending on, for example, the selection of the curing conditions for the base layer 12, the recording layer 13, and the back layer 14, and the selection of the material of the substrate 11. For example, as the curing time is made longer for a paint for base layer formation, a paint for recording layer formation, and a paint for back layer formation, or as the curing temperature is raised therefor, the reaction between the binder and curing agent included in each of the paints is accelerated. Thus, the elastic characteristic is improved, and the elastic limit value σMD is improved.
