Abstract: A magnetic head having at least a main pole having a profile on a magnetic head air bearing surface composed of a first portion having a length in a cross-track direction which continuously increases from a leading edge to a trailing edge, and a second portion located on the side of the trailing edge of the first portion. A length of the second portion in the cross-track direction at the trailing edge is substantially equal to a length in the cross-track direction at the point of contact between the first and second portions. A rate of change in the length of the second portion in the cross-track direction from the leading edge to the trailing edge is different from a rate of increase in the length of the first portion in the cross-track direction.

Abstract: A method of fabricating a thin film magnetic recording head including a perpendicular recording head having an auxiliary pole, a main pole and a shield against an external magnetic field. The shield against the external magnetic field is formed so that an edge of the shield against the external magnetic field is disposed at a position recessed at least from an edge of the main pole relative to a surface against a medium.

Abstract: A single-pole type magnetic head for perpendicular recording which reduces the amount of side writing even in the presence of a yaw angle and prevents the effective track width from decreasing, and a magnetic recording disk apparatus using the same. A main pole is composed of at least two portions where the width of the first portion continuously increases from the upstream side to the downstream side in the medium moving direction and the width of the second portion is the same as the width of the first portion's downstream edge in the medium moving direction and is constant from the upstream side to the downstream side in the medium moving direction. This prevents the recording magnetic field strength from decreasing at the track edge and increases the effective track width while suppressing side writing, thereby realizing a magnetic recording disk apparatus with a high track density.

Abstract: The invention fabricates a perpendicular recording head eliminating influence of external magnetic field and provides a magnetic disk drive having high stability by using the magnetic recording head and constructs a structure in which shield against external magnetic field is formed from a main pole via a gap layer and an edge portion thereof is recessed from a surface against a medium. By providing the shield against the external magnetic field, the influence of the external magnetic field is restrained and by recessing the edge from the surface against the medium, leakage of magnetic field from the shield against the external magnetic field to the medium is prevented to thereby prevent a magnetization signal from being erased.

Abstract: A single-pole type magnetic head for perpendicular recording which reduces the amount of side writing even in the presence of a yaw angle and prevents the effective track width from decreasing, and a magnetic recording disk apparatus using the same. A main pole is composed of at least two portions where the width of the first portion continuously increases from the upstream side to the downstream side in the medium moving direction and the width of the second portion is the same as the width of the first portion's downstream edge in the medium moving direction and is constant from the upstream side to the downstream side in the medium moving direction. This prevents the recording magnetic field strength from decreasing at the track edge and increases the effective track width while suppressing side writing, thereby realizing a magnetic recording disk apparatus with a high track density.

Abstract: The invention fabricates a perpendicular recording head eliminating influence of external magnetic field and provides a magnetic disk drive having high stability by using the magnetic recording head and constructs a structure in which shield against external magnetic field is formed from a main pole via a gap layer and an edge portion thereof is recessed from a surface against a medium. By providing the shield against the external magnetic field, the influence of the external magnetic field is restrained and by recessing the edge from the surface against the medium, leakage of magnetic field from the shield against the external magnetic field to the medium is prevented to thereby prevent a magnetization signal from being erased.

Abstract: In the thermal process air flow meter according to the invention first, second and third electrode terminals are arranged on the same surface at one end of a substrate. A first exothermic resistor is connected between the first and second terminals, and a second exothermic resistor is connected between the second and third terminals, with the first exothermic resistor on a front surface of a substrate and the second exothermic resistor on the opposite (back) surface. The substrate may also carry the semiconductor elements of an electronic circuit used to analyze electric signals from the terminals. In a preferred embodiment of the invention, the substrate is mounted at an incline relative to the direction of unobstructed air flow in the air passage.

Abstract: A thermal head which comprises an electrically insulating substrate, a glaze layer laid thereon, a heating resistor layer laid on the glaze layer, a plurality of first layer conductors laid on the heating resistor layer and provided at predetermined distances, a protective film laid on the heating resistor layer, and a plurality of second layer conductors counterposed to the first layer conductors and laid on the first layer conductors through an interlayer insulating film, where the interlayer insulating layer is in a two layer structure of an inorganic insulating material layer having a compressive stress and an organic insulating material layer, and the organic insulating material layer is positioned on the second layer conductor side. The thermal head as structured above is free from a problem of crack formation on the interlayer insulating layer, causing a short circuit and free from a problem of discontinuation of the second layer conductors.