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EP0070907A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Vertical recording-type single pole magnetic head

Assignee: Individual
•
Filing: 1982-02-05
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Granted: —
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Expires: 2002-02-05
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Abstract

Abstract A vertical recording-type single pole magnetic head in which with a medium (21) the surface (16) contacting of a pillar-shaped core (12) is so formed, that the medium entering-side edge (15) is not parallel to the medium leaving-side edge (14) by the length of several times working wavelength (À). The pillar-shaped core (12) has a trapezoid pillar shape. The azimuth effect at the time of reproduction makes it possible to increase the average thickness of the core (12) in the direction (v) the medium advances without any sacrifice of the reproduction resolution, so that the magnetic flux transfer efficiency between the top (16) of the core and the coil-wound portion thereof is so increased as to make recording and reproduction from the one side of the medium (21) possible. Especially in using a tape medium, soft magnetic material (12b) with a higher saturation magnetization is put by vacuum evaporation onto the side wall of the pillar-shaped core (12) on the medium leaving side thereof so as to narrow the distribution of the vertical recording magnetic field with the result of increasing the recording efficiency.

Inventors

  • 👤 Akio Ohtsubo

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 15:24
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1278

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 124 words
A vertical recording type single pole magnetic head comprising a prism-shaped core (12) and a coil (13) magnetically coupled to said prism-shaped core, said magnetic head magnetically recording an electrical signal applied across said coil (13) and magnetically reproducing the recorded signal from one side of a surface of a magnetic medium (21) which moves relative to the prism-shaped core (12), said prism-shaped core having a surface (16) adjacent to and parallel with said surface of the magnetic medium, characterized in that the edge (15) of said surface (16) at the upstream side with respect to the direction (v) of the movement of the medium and the edge (14) thereof at the downstream side form different angles with said direction (v) of the movement.
Claim 2
Dependent Claim 124 words
A vertical recording type single pole magnetic head comprising a prism-shaped core (12) and a coil (13) magnetically coupled to said prism-shaped core, said magnetic head magnetically recording an electrical signal applied across said coil (13) and magnetically reproducing the recorded signal from one side of a surface of a magnetic medium (21) which moves relative to the prism-shaped core (12), said prism-shaped core having a surface (16) adjacent to and parallel with said surface of the magnetic medium, characterized in that the edge (15) of said surface (16) at the upstream side with respect to the direction (v) of the movement of the medium and the edge (14) thereof at the downstream side form different angles with said direction (v) of the movement.
Claim 3
Dependent Claim 17 words
A magnetic head as claimed in claim 1, characterized in that said surface (16) forms a trapezoided.
Claim 4
Dependent Claim 17 words
A magnetic head as claimed in claim 1, characterized in that said surface (16) forms a pentagon.
Claim 5
Dependent Claim 77 words
A magnetic head as claimed in claim 1, characterized in that said prism-shaped core (12) comprises a prism-forming core (12a) formed of a first magnetic material, and a magnetic-pole-forming layer (12b) formed of a second magnetic material of greater magnetic saturation than said first magnetic material, said magnetic-pole-forming layer (12b) being secured-on a surface of said prism-forming core (12a) which is on the downstream side with respect to said direction (v) of the movement of the medium.
Claim 6
Dependent Claim 19 words
A magnetic head as claimed in claim 1, characterized in that said prism-shaped core (12) is formed of sendust.
Claim 7
Dependent Claim 40 words
A magnetic head as claimed in claim 4, characterized in that said prism-forming core (12a) is formed of a ferrite and said magnetic-pole-forming layer (12b) is formed of a magnetic material selected from the group consisting of permalloy and sendust.

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