The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 1996
Filed:
Jun. 23, 1995
Takao Mori, Miyagi, JP;
Kazunobu Chiba, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magnetic recording medium comprising a non-magnetic support, a magnetic metal thin film formed on one surface of the non-magnetic support and a back coating layer formed on the opposite surface of the non-magnetic support. The back coating layer is composed of non-magnetic pigment powders containing carbon powders and a binder, and the content of the carbon powders based on the total weight of the non-magnetic pigment powders is not less than 20 wt %. The weight ratio of the non-magnetic pigment powders to the binder is 0.5 to 2, while the coating thickness of the back coating layer is not less than 0.2 .mu.m. The surface resistivity of both the magnetic metal layer and the back coating layer is not higher than 10.sup.6 .OMEGA./sq. The stable running performance may be achieved even if the thickness of the back coating layer is reduced, if within a range of 0.2 .mu.m or higher. In this manner, the tape cassette may be reduced in size and the quantity of the storable information may be increased to contribute to reduction in size of the magnetic recording/reproducing apparatus.