Static magnetic reading head having a plurality of elementary heads

Claim 2

A static magnetic recording head, comprising: a plurality of excitation wires arranged substantially parallel to each other; a plurality of signal wires arranged substantially parallel to each other such that said excitation and signal wires intersect to form a matrix; and a plurality of elementary heads, each having a magnetic circuit with a substantially linear magnetization characteristic, including a non-linear magnetic element having a gap for reading a magnetic tape, each of said elementary heads being disposed at an intersection of said excitation and signal wires; wherein said plurality of elementary head comprises: a plurality of substantially trapezoidal blocks separated by grooves to form a matrix of said blocks; said non-linear magnetic elements being disposed on diagonally adjacent of said blocks; and said signal and excitation wires being disposed in said grooves.

Claim 3

A head according to claim 1, wherein the excitation wires are supplied with DC current on which high frequency signals are superimposed.

Claim 4

A head according to claim 1 connected to operate as a line-scanning and tape-exploring head.

Claim 5

A head according to claim 2, wherein the high frequency signals are wave trains with a frequency such that, during a period of excitation of the excited lines, at least ten alternations of these waves are sent.

Claim 6

A head according to claim 2, wherein the DC current is sent only to the excitation wires of the elementary heads to be excited.

Claim 7

A head according to claim 2, wherein the frequency of the high frequency signal has a value close to the value of the resonance frequency of the distributed circuit formed by the corresponding line and the elementary heads that border it.

Claim 8

A head according to claim 2, wherein all the lines of excitation wires are excited simultaneously but at different frequencies, and corresponding filters are connected to the different columns.

Claim 9

A head according to claim 1 comprising said elementary heads being arranged in lines and columns, wherein the lines of said elementary heads are obliquely disposed to a running direction of the magnetic tape to be read.

Claim 10

A head according to claim 8, wherein the columns of said elementary heads are perpendicularly disposed to the running direction of the magnetic tape.

Claim 11

A head according to claim 1, wherein said wires form a substantially orthogonal network, and wherein the non-linear element of each magnetic circuit is disposed obliquely with respect to each of the wires of the network. PG,19

Claim 12

A head according to claim 1, wherein the linear part of each magnetic circuit is made of a material with low relative permeability such as ferrite, and wherein its non-linear part is made of a material with high magnetic permeability such as Permalloy or Sendust.

Claim 13

A static magnetic recording head, comprising: a plurality of excitation wires arranged substantially parallel to each other; a plurality of signal wires arranged substantially parallel to each other such that said excitation and signal wires intersect to form a matrix; and a plurality of elementary heads, each having a magnetic circuit with a substantially linear magnetization characteristic, including a non-linear magnetic element having a gap for reading a magnetic tape, each of said elementary heads being disposed at an intersection of said excitation and signal wires; wherein the length of the parts of the magnetic circuits with a non-linear characteristic is substantially equal to the product of the relative permeability of these non-linear parts by their thickness.

Claim 14

A static magnetic recording head, comprising: a plurality of excitation wires arranged substantially parallel to each other; a plurality of signal wires arranged substantially parallel to each other such that said excitation and signal wires intersect to form a matrix; and a plurality of elementary heads, each having a magnetic circuit with a substantially linear magnetization characteristic, including a non-linear magnetic element having a gap for reading a magnetic tape, each of said elementary heads being disposed at an intersection of said excitation and signal wires; wherein the length of the parts of the magnetic circuits with a non-linear characteristic is substantially equal to the product of the relative permeability of these non-linear parts by their thickness.

Claim 15

A static magnetic recording head, comprising: a plurality of excitation wires arranged substantially parallel to each other; a plurality of signal wires arranged substantially parallel to each other such that said excitation and signal wires intersect to form a matrix; and a plurality of elementary heads, each having a magnetic circuit with a substantially linear magnetization characteristic, including a non-linear magnetic element having a gap for reading a magnetic tape, each of said elementary heads being disposed at an intersection of said excitation and signal wires; wherein the gaps of the elementary heads corresponding to successive tracks of the magnetic tape to be read are alternately oriented in a first direction and a second direction, these two directions forming substantially symmetrical angles with respect to a third direction perpendicular to the running direction of the tape.

Claim 16

A static magnetic recording head, comprising: a plurality of excitation wires arranged substantially parallel to each other; a plurality of signal wires arranged substantially parallel to each other such that said excitation and signal wires intersect to form a matrix; and a plurality of elementary heads, each having a magnetic circuit with a substantially linear magnetization characteristic, including a non-linear magnetic element having a gap for reading a magnetic tape, each of said elementary heads being disposed at an intersection of said excitation and signal wires; wherein the gaps of the elementary heads corresponding to successive tracks of the magnetic tape to be read are alternately oriented in a first direction and a second direction, these two directions forming substantially symmetrical angles with respect to a third direction perpendicular to the running direction of the tape.

Claim 17

A head according to claim 13, wherein the said two directions each make an angle of 10° to 45° with said third direction.

Claim 18

A static magnetic head, comprising: a back plate having a plurality of substantially trapezoidal blocks arranged in a matrix and separated by a first and second plurality of substantially parallel intersecting grooves; a plurality of excitation wires disposed in said first plurality of grooves; a plurality of signal wires disposed in said second plurality of grooves; a pair of pole pieces with a gap therebetween disposed on corresponding of said blocks such that said gap is disposed over each intersection of one of said excitation wires with one of said signal wires.

Claim 19

A static magnetic head, comprising: a back plate having a plurality of substantially trapezoidal blocks arranged in a matrix and separated by a first and second plurality of substantially parallel intersecting grooves; a plurality of excitation wires disposed in said first plurality of grooves; a plurality of signal wires disposed in said second plurality of grooves; a pair of pole pieces with a gap therebetween disposed on corresponding of said blocks such that said gap is disposed over each intersection of one of said excitation wires with one of said signal wires.