摘要:
A magnetic recording medium composed of a non-magnetic support having thereon at least one magnetic layer containing a ferromagnetic fine powder dispersed in a binder, wherein (a) the magnetic layer further contains at least one of (i) carbon black having a sodium content of at most 100 ppm, (ii) carbon black having a chlorine content of less than 400 ppm, and (iii) an abrasive having a Mohn' hardness of at least 8 and a mean particle size of 0.05 to 0.5 .mu.m and a sodium content of at most 100 ppm; (b) the ferromagnetic fine powder is a magnetic metal powder having a sodium content of at most 200 ppm; and/or (c) the magnetic recording medium further has a back layer provided on the side of the non-magnetic support opposite to the magnetic layer, containing carbon black having a chlorine content of at most 300 ppm dispersed in a binder. The magnetic recording medium has superior storage stability, with remarkably limited dropout increase, head clogging, C S/N decrease and RF output decrease.
摘要:
A magnetic recording medium in which the generation of white powder is suppressed, which recording medium maintains an appropriate running tension and exhibits a reduced level of dropouts and head clogging, comprising a non-magnetic support having thereon a magnetic layer, the magnetic layer containing a ferromagnetic powder and a binder, the ferromagnetic powder is a ferromagnetic metal powder and the magnetic layer contains a branched chain fatty acid represented by formula (I):R.sub.2 CH(CH.sub.2).sub.m COOH (I)wherein R represents CH.sub.3 (CH.sub.2).sub.n, n represents an integer of 8 or more, and m represents 0 or 1 in an amount of from 0.5 to 3 parts by weight per 100 parts by weight of said ferromagnetic metal powder.
摘要:
A magnetic recording medium comprises a magnetic layer containing a ferromagnetic powder, a binder and an abrasive material having a Mohs hardness of 8 or more on a non-magnetic support, wherein the average protrusion height, which represents the length between the central line of the surface roughness of the sectional curve of the magnetic layer and the upper end of the abrasive material existing (i) above the central line of the surface roughness of the magnetic layer and (ii) in the surface layer of the magnetic layer, is 15 nm or less. A process for preparing the magnetic recording medium comprises coating on a non-magnetic support a magnetic layer containing a ferromagnetic powder, a binder and an abrasive material having a Mohs hardness of 8 or more, and then polishing the surface of the magnetic layer with an abrasive tape, wherein as the abrasive tape there is used one containing at least one abrasive material having a higher Mohs hardness than the abrasive material to be incorporated in the magnetic layer.
摘要:
A magnetic recording medium having well-balanced properties with respect to head abrasion characteristics, head cleaning characteristics and drop out characteristics is disclosed, which comprises a non-magnetic support having thereon a magnetic layer containing a ferromagnetic powder and a binder, wherein the magnetic layer has been brought into contact with a carbon steel alloy or super hard alloy made from powders having a Mohs' hardness of at lease 6 and rubbed therewith. A process of producing the magnetic recording medium is also disclosed.
摘要:
A magnetic recording medium using a biaxially oriented aromatic polyamide film as a nonmagnetic support resulting in hardly any improper windings or edge damages. The magnetic recording medium includes a magnetic layer containing ferromagnetic powders dispersed in a binder formed on the nonmagnetic support, wherein the biaxially oriented aromatic support has a ratio of the loss tangent at a temperature of 40° C. to the loss tangent at a temperature of 100° C. of 0.7 or higher.
摘要:
Provided is a magnetic recording medium with a total thickness equal to or less than 8 &mgr;m having good electromagnetic characteristics and good repeat running durability in which the dropping of powder onto the running path and tape edge deformation are prevented and a magnetic recording medium with a total thickness equal to or less than 8 &mgr;m having good electromagnetic characteristics, good repeat running durability, and good dimensional stability. A magnetic recording medium having on one surface of a nonmagnetic support a lower layer comprising an inorganic powder and a binder and an upper magnetic layer comprising a ferromagnetic powder and a binder in that order, and having on the other surface thereof a backcoat layer, wherein: said nonmagnetic support comprises inorganic powder particles with a mean primary particle diameter in a range of from 40 to 200 nm; the number of particles of said inorganic powder in the cross-section of said nonmagnetic support is in a range of from 10 to 200/100 &mgr;m2, said nonmagnetic support exhibits a coercivity in a range of from 159 to 239 kA/m; and the overall thickness is equal to or less than 8 &mgr;m. A magnetic recording medium having on one surface of a nonmagnetic support a lower layer comprising an inorganic powder and a binder and an upper magnetic layer comprising a ferromagnetic powder and a binder in that order, and having on the other surface thereof a backcoat layer, wherein: said nonmagnetic support comprises inorganic powder particles with a mean primary particle diameter in a range of from 10 to 200 nm; the number of particles of said inorganic powder in the cross-section of said nonmagnetic support is in the range of from 10 to 200/100 &mgr;m2, the amount of curl d in the direction of width of said magnetic recording medium is equal to or higher than 0.4 mm and equal to or less than 1.0 mm in the direction of protrusion of the magnetic layer at a width of 6.35 mm; and the overall thickness is equal to or less than 8 &mgr;m.
摘要:
An optical element is provided with a wavelength-selective reflection layer having a five-layer configuration in which high-refractive-index layers and metal layers are alternately stacked. The present invention is designed so that the ratio α of an optical film thickness db of the entire metal layer relative to an optical film thickness da of the high-refractive-index layers as a whole, and the ratio β (=d3/d1) of an optical film thickness d3 of the third high-refractive-index layer with respect to the optical film thickness d1 of the first high-refractive-index layer as viewed from either the first optical layer side or the second optical layer side are included within a predetermined range.
摘要:
Provided are an image processing apparatus and method of controlling same for detecting, in pixel units, an edge that exists prior to encoding, thereby protecting an edge that exists prior to encoding and reducing noise produced by encoding. To accomplish this, the image processing apparatus compares a threshold value generated from quantization information of each pixel when decoding is performed, and the absolute values of differences between a pixel of interest and pixel peripherals thereto, detects, in pixel units, an edge that existed prior to encoding, and corrects only noise produced by encoding.
摘要:
An optical element includes a first surface, a second surface positioned to face the first surface, and a plurality of reflecting surfaces arrayed in a first region defined by the first surface and the second surface, wherein the reflecting surfaces have a first length in a first direction vertical to the first surface and are arrayed at a pitch in a second direction perpendicular to the first direction, light incident on one of the first surface and the second surface is reflected by the reflecting surfaces toward the other surface, and predetermined parameters satisfy predetermined relational formulae representing conditions for ensuring total reflection at the reflecting surfaces and for avoiding total reflection at a light emergent surface.
摘要:
An optical element includes a first surface, a second surface positioned to face the first surface, and a plurality of reflecting surfaces arrayed in a first region defined by the first surface and the second surface, wherein the reflecting surfaces have a first length in a first direction vertical to the first surface and are arrayed at a pitch in a second direction perpendicular to the first direction, light incident on one of the first surface and the second surface is reflected by the reflecting surfaces toward the other surface, and predetermined parameters satisfy predetermined relational formulae representing conditions for ensuring total reflection at the reflecting surfaces and for avoiding total reflection at a light emergent surface.