Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1980-11-17
1982-06-29
Silverman, Stanley S.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
360134, 360135, 360136, 427128, 427130, 428328, 428329, 428330, 428409, 428694, 428900, G11B 570
Patent
active
043372880
ABSTRACT:
A magnetic recording medium comprising a coated magnetic recording layer having video and chroma S/N ratios appropriately balanced with tape transporting characteristics is attained by controlling the magnetic layer to have a surface roughness such that the maximum value of the arithmetical average roughness (Ra) is about 80 A or greater in the surface roughness pitch region greater than about 300 .mu.m while in the surface roughness pitch region of about 5 .mu.m to about 100 .mu.m the maximum value of the arithmetical average roughness (Ra) is about 40 A or less.
REFERENCES:
patent: 3817785 (1974-06-01), Abitoul
patent: 4015042 (1977-03-01), Chassaigne
patent: 4071654 (1978-01-01), Ogama et al.
patent: 4100326 (1978-07-01), Somezawa et al.
patent: 4272602 (1981-06-01), Stemme et al.
Fujiyama Masaaki
Tadokoro Eiichi
Takenaka Haruo
Fuji Photo Film Co. , Ltd.
Silverman Stanley S.
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