JPS62273615A - Recording and reproducing head for magnetic tape - Google Patents

Abstract

PURPOSE:To prevent the S/N from being lowered even if an offtrack takes place by selecting an azimuth angle of recording and reproducing head cores opposite to each other alternately in a direction at a right angle to a track for every adjacent tracks. CONSTITUTION:A recording/reproducing head 1 consists of recording head cores 31-34, reproduction head cores 21-24 and an erasure head 4. An azimuth angle theta is given to the gaps 61-64 of the cores 31-34 in a direction at a right angle of the recording direction D of the track and an inverted angle theta is given to every adjacent tracks. Then the angle theta of the gasp 51-54 of the cores 21-24 is selected the same as the gaps 61-64 of the same track. Thus, a signal from adjacent tracks is reduced at reproduction and even if an offtrack takes place, the S/N is not reduced, then the track density is improved.

Description

[Detailed description of the invention] Detailed description of the invention Field of industrial use] The present invention relates to a magnetic tape recording/reproducing head.

[Conventional technology]

In a conventional magnetic tape device, as shown in FIG. 3, a recording/reproducing head 1 is composed of a recording head core 3, a reproducing head core 2, and an erasing head core 4.

The recording head gap 6 of the recording head core 3 is disposed perpendicular to the recording direction of the track 9, and the read head gap 5 of the read head core 2 and the erase head gap 7 of the erase head core 4 are arranged in the same manner. Recording and reproduction were performed at right angles to the recording direction of 9.

[Problem that the invention seeks to solve]

In the conventional magnetic tape device described above, the recording head gap part of the recording head core and the reproduction head gap part of the reproducing head core are perpendicular to the recording direction of the track.
When an off-track occurs in which the magnetic tape shifts in a direction perpendicular to the recording edge direction of the track, the signal recorded in the overlapping portion with the rad gap portion is transferred to the reproduction device that reproduces the signal of the adjacent track and the track that should originally be reproduced. The problem is that the signal is reproduced and output without being reduced, resulting in a noise signal compared to the signal recorded on the track that should originally be reproduced, which promotes a decrease in the S/N ratio and worsens the data error rate.

[Means for solving problems]

The magnetic tape recording/reproducing head of the present invention includes a plurality of recording head cores arranged substantially perpendicularly to the recording direction of a track, each having a gap portion, and a predetermined approximately constant distance between each of the recording head cores in the perpendicular direction. A magnetic tape recording/reproducing head comprising a plurality of reproducing head cores arranged at intervals and each having a gap portion, and an erasing head core disposed at a predetermined interval from each of the recording head cores and having a gap portion. , the gap portions of the adjacent recording head cores are inclined in opposite directions by a predetermined angle with respect to the vertical direction, and the gap portions of the read head cores are substantially parallel to the gap portions of the adjacent recording head cores. This is a characteristic feature.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing a state of signal recording on a recording track of a magnetic tape device according to an embodiment of the present invention. Figure 1(a)
As shown in FIG.
It is composed of a recording head group having adjacent recording head cores 1 to 34, a reproducing head group having reproducing head cores 21 to 24 adjacent to each other, and an erasing head core 4.

Recording head gap portion 61 of recording head cores 31 to 34
64 records a signal on the magnetic tape 8 at a certain angle θ (this certain angle is hereinafter referred to as an azimuth angle) with respect to the direction perpendicular to the recording direction of the track 9, and radiates it to the recording of the adjacent recording head core. Tracks recorded with the same azimuth angle of the gap portion in opposite directions are arranged alternately.

Rad gap section 51 for reproduction of the reproduction head cores 21 to 24
The azimuth angle of ~54 is recorded by Radgear on the same track.
The azimuth angle is set to be the same as that of the protrusions 61 to 64, and the signal recorded on the magnetic tape 8 is read out.

If this is done, as shown in FIG. 1(b), even if the magnetic tape 8 is off-track with respect to the recording/reproducing head 1 and the track 91 is covered by the reproducing head core 22, the reproducing head gap 52 will be closed. Since the azimuth angle is twice that of the magnetization pattern 10 recorded on the track 91, if the azimuth angle is set to a predetermined size, the magnetization pattern of the adjacent track 92 will hardly affect the magnetization pattern.

FIG. 2 is a diagram showing the state of signal recording on the recording track of the magnetic tape device according to the embodiment of the present invention.

FIG. 2 (a> is the recording head width WW and track pitch TP.
FIG. 2(b) shows an example in which the reproducing head width RW, the recording head width WW, and the track width TP are made equal.

〔Effect of the invention〕

As explained above, the present invention allows the azimuth angle of the recording head core and the reproducing head core to be adjusted for each adjacent track.
・By recording tracks alternately in opposite directions to the right angle direction, and reducing signals from adjacent tracks during playback,
Even if off-track occurs, where the recording/reproducing head and the magnetic tape are relatively misaligned, the track density can be greatly improved without reducing the S/N ratio.
This has the effect of significantly improving the off-track margin and reducing the data error rate.

[Brief explanation of drawings]

FIGS. 1(a) and (b) are schematic diagrams of the first embodiment of the present invention, and FIGS. 2(a) and (b) are schematic diagrams of the second and third embodiments of the present invention. FIG. 3 is a schematic diagram of a conventional example. l...recording/reproducing head, 21-24...to playback/soto core, 31-34...recording head core, 4...erasing head core, 51-54...rad gap to playback,
61-64... Rad gap for recording, 7... Rad gap for erasing, 8... Magnetic tape, 9... Track, 91... Track, 92... Track, D...
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Claims (1)

[Claims] A plurality of recording head cores are arranged substantially perpendicularly to the recording direction of the track and each has a gap portion; In the magnetic tape recording/reproducing head, the magnetic tape recording/reproducing head includes a plurality of reproducing head cores having a plurality of reproducing head cores, and an erasing head core disposed at a predetermined distance from each of the recording head cores and having a gap portion, wherein the gap portion of the adjacent recording head cores is A recording/reproducing head for a magnetic tape, characterized in that the reproducing head cores are inclined in opposite directions by a predetermined angle with respect to the vertical direction, and the gap portions of the reproducing head cores are substantially parallel to the gap portions of the adjacent recording head cores.