Magnetic head for effecting perpendicular magnetic recording

Claim 1

A magnetic head for magnetization of a magnetic tape in a thickness direction perpendicular to the length and width of the tape as the tape moves in the longitudinal direction of its length, comprising: a main magnetic pole having a top surface, and having a thin layer of high permeability magnetic material, extending in said thickness direction and having an end in said top surface for facing the tape moving thereacross in said longitudinal direction, nonmagnetic supporter means for holding said thin layer at a top portion of said main magnetic pole adjacent to the magnetic tape, and a first block of high permeability magnetic material magnetically connected to said thin layer; a second block of high permeability magnetic material adjacent said main magnetic pole; and a third block of high permeability magnetic material, facing said top surface is spaced relation thereto so as to define a path for longitudinal movement of the tape therebetween; said magnetic head having such dimensions that d/Sd>U/Su d/Sd>V/Sv, where Sd is a facing area of said first block to said high permeability magnetic layer, d is a mean distance valve therebetween, Su is a facing area between said second and third blocks, u is a mean distance value therebetween, Sv is a facing area between said first and second blocks, and V is a mean distance value therebetween.