Magnetic recording medium having a dimensional variation and cartridge
AssigneeSony Corporation
InventorsMinoru Yamaga, Noboru Sekiguchi
Life of this patent
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Abstract
A tape-type magnetic recording medium, includes a substrate; and a magnetic layer provided on the substrate. The magnetic recording medium is configured such that (1) (wmax−wmin)/wmin≤400 [ppm] where wmax and wmin are respectively maximum and minimum of average values of width of the magnetic recording medium measured under four environments whose temperature and relative humidity are (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), respectively, and the magnetic layer has a squareness ratio of 65% or more in the vertical direction, and (2) 4.4≤TB/(TA−TB) where TA is an average thickness of the magnetic recording medium and TB is an average thickness of the substrate.
Claims30
A tape-type magnetic recording medium, comprising:
- a substrate;
- and
- a magnetic layer provided on the substrate, wherein
- (wmax−wmin)/wmin≤400 [ppm] (1)
- where wmax and wmin are respectively maximum and minimum of average values of width of the magnetic recording medium measured under four environments whose temperature and relative humidity are (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), respectively,
- the magnetic layer having a squareness ratio of 65% or more in a vertical direction, and
- 4.0≤TB/(TA−TB) (2)
- where TA is an average thickness of the magnetic recording medium and TB is an average thickness of the substrate.
Dependencies are inferred from the claim text.