JPH03225608A - Rotary magnetic head and its production - Google Patents

Abstract

PURPOSE:To improve the yield of a rotary magnetic head and to enhance productivity by butting 1st and 2nd core chips against each other and shifting the butt surfaces to a dull angle type. CONSTITUTION:The rotary magnetic head is constituted by forming grooves 11 on ferrite blocks 10, providing sputtered films 12 of 'SENDUST(R)' on the surfaces on one side of the grooves 11, and forming 2nd grooves 13. A recessed part 16 for winding is formed to the ferrite core 14 worked in such a manner and this core is superposed on the other core 15. The sputtered films layers of 'SENDUST(R)' are so superposed that the butt surfaces constitute a magnetic gap. The glass layers are then welded to fix the cores. The block is sliced like dotted lines to obtain plural pieces of the rotary magnetic heads. The reference position for cutting of the grooves 11, 13 or the reference plane for superposing of the ferrite blocks is extremely slightly shifted so that the end faces of the magnetic gap are shifted and many of the magnetic heads having nearly the dull angle type as shown in Figs. are obtd.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a rotating magnetic head having an azimuth angle and a method for manufacturing the same, and in particular, to a rotary magnetic head having an azimuth angle and a method for manufacturing the same. The present invention relates to the rotating magnetic spatula 1 and its manufacturing process.

rSummary of the Invention The rotary cylinder and its manufacturing method of the present invention are V T
In R, etc., when performing two guard pan dress lines with a rotating head that records signals in the diagonal direction of &fl air, the core shift in the butt blood of the magnetic gap with the azimuth fft is caused by a specific By aligning the direction in the same direction, the signal area erased in the 1n track portion during solid recording can be reduced, and the chisel method in which such rotary FFI heads are often manufactured can be used. It provides:

[Prior art 1: V recording video signals on magnetic tape using a rotating head
TR1 usually has a guard band between the convex recording tracks.
It is possible to adopt recording in the SP mode in which the recording tracks disappear, and in the LP mode in which guard bands are not provided between adjacent recording tracks.

In the case of recording in LP mode (called guard panless recording or solid recording), in order to reduce crosstalk signals reproduced from adjacent tracks, the magnetic gap between the two rotating heads is The azimuth angle is provided to reduce crosstalk (i.e., the azimuth angle to the track formed by the first rotating head and the second rotating head as shown in FIG. 5). The azimuth angle of track B formed at IF5 is set to 6 to 7 degrees (41°), and the level of the crosstalk signal picked up by the rotating 1a air head from the adjacent track is determined by the difference in the azimuth angle. is made smaller.

However, in the case of such a solid recording method, when recording track A, a portion of the adjacent track B that has already been recorded is slightly ascribed, so the track width W of the rotating magnetic head is The width of the track that has already been recorded becomes narrower by the overwriting width W1.

['R, the problem that Akira attempts to solve] As shown in Fig. 6(a) and (b), the width of the gap G (track width) of the co-rotating head is assumed to be W. 1, even when the gap G is closed, a leakage magnetic flux φ is generated at the end face of the gap G as shown by the dotted line.
There is one problem.

(No signal is recorded in the area affected by the leakage 6ft east, and it appears that the recorded edge signal has been erased.) This erased edge side side (RecordingSide: r rs
sc) width (hereinafter referred to as R5E width) is usually 2 to 3 μm, and the track width is 29.2 μm ((3
In the case of I+ 1 and 20.5 μm (8 mm SP), this was not considered to be much of a problem, but in the future, if the track width is reduced due to improvements in magnetic heads, and the track width is reduced to about 10 μm, for example, it will become a value that cannot be ignored. become.

In other words, when the track width becomes 10 μm, the actual track width of the recording signal area will decrease by 20 to 30% depending on the width of the PSE.
Makoto decided to make this track I! The S/N ratio at the time of recording becomes thicker (deteriorating).

Means for Solving Problem E 1 The present invention was made for the purpose of alleviating this problem, and in a rotating magnetic head to which an azimuth angle is added, the A rotating magnetic head in which the deviation angle θ caused by the deviation is an obtuse angle is used as a recording head.

In addition, it is likely that such rotating magnetic heads will be mass-produced.
l 1m method.

[Function] ...A deviation angle O at the end face of the abutting surfaces that forms the air gap.
The width of the PSE is smaller than that of the UL magnetic head where the deviation is an obtuse angle, and the magnetic head where the deviation of 1N is an acute angle.
In particular, when the track width becomes narrow, the S/N ratio can be reduced.

[Example 1] Figure 1 is a perspective view of an example of a rotating magnetic head which is a counter dye of the present invention, and 1 and 2 are first and second core chips made of monocrystalline ferrite. , 3 is a sendust layer attached to the first and second core chips by 7 km or the like. 4 indicates a magnetic gap formed by joining the first and second core chips 1 and 2 across.

As shown in an enlarged view described later, this magnetic gap has an azimuth angle slightly inclined by 11 with respect to the direction of movement of the rotating magnetic head.

Note that 5 indicates a welded glass layer.

The magnetic gap 4 is 0.2 to 0.3 μm, and the width of the magnetic gap (head width) varies depending on the model.
．． It is said to be 5 μm.

FIGS. 2(a) and 2(b) show the magnetic gap 4 in FIG.
The magnetic gap 4 is formed to have an inclined azimuth angle (7°).

By the way, as will be explained later in the manufacturing method of a rotary magnetic head, in such a magnetic head, the end face of the magnetic gap 4 is set at Δt due to the precision of abutment between the first core 1 and the second core 2 that form the magnetic gap. If you add only
Depending on the direction of the deviation, magnetic heads with an obtuse angle θ1 as shown in FIG. 2(a) and magnetic heads with an acute angle θ2 as shown in FIG. 2(b) are mass-produced.

As the deviation △ of the end face of this magnetic gap increases, the recording track width becomes wider (and products with this deviation △ exceeding the standard are excluded at the finished product stage. If it is within 3 μm, it is considered a standard product.
It was adopted for the rotating drum of VTR.

Then, as this deviation Δt increases, the width of R2H becomes thicker (T·measured) as before +ia L/.

However, when the width of RSE was measured using an obtuse angle type rotating magnetic head and an acute angle type rotating magnetic head before the present invention, data as shown in FIG. 3 was obtained.

According to this data diagram, even if the obtuse-angle type rotating magnetic head has a deviation △L of about 3 μm, there is almost no increase in the width of R2H, but with the acute-angle type rotating magnetic head, even if the deviation △E is the same, the width of RSE It turned out to be thick.

Although the reason for this is not clear, it is thought that the leakage in the east from the end face of the obtuse-angle type rotating magnetic head tends to be directed toward the gap side.

Therefore, the M-angle type rotating magnetic head can maintain the width w2 of 115E when performing solid recording as described above.

Therefore, especially when manufacturing a rotary magnetic head with a narrow gap width, it is desirable to increase the proportion of obtuse-angle type rotary magnetic heads.

Then, it can be predicted that a track will be formed on a VTR or the like at 2, which has a better S/N ratio than before.

It goes without saying that even with the obtuse angle type, the deviation Δt is larger than the standard value (if this happens, the recording track width (W) itself becomes larger, which is not preferable).

By the way, the above-mentioned rotating magnetic head is shown in FIG. 4(a).
), a groove 11 is formed in the ferrite block IO by primary processing, and a sendust sputtered film 12 is provided on one side of the groove 11.

Then, the second full 13 is formed by secondary processing.

The other processed ferrite core 15, which has a recess 16 for winding wire, is placed on top of the processed ferrite core 14 described above, positioned so that the abutting surfaces of the sendust sputtered layers form a magnetic gap, and the glass layer is welded and fixed. do.

By slicing along the dotted lines as shown in FIG. 4(f), a plurality of rotating magnetic heads can be obtained in one process.

In this case, the above-mentioned deviation of the magnetic gap end face is t
Iη11 or +3 depends on the cutting accuracy, and the fourth
In the figure, it is affected by the overlapping accuracy of two ferrite blocks.

Therefore, in the method for manufacturing a rotating 6n air head according to the present invention, the groove 1! , 13 or the overlapping reference plane of the ferrite block is shifted very slightly from the center, and in the state shown in Fig. 4(f), the deviation of the magnetic gear end face is often close to the obtuse angle type marked m1. (Make it so.

In other words, in the case of U.S.-produced balls, the reference position where the deviation of the magnetic gap end face is O is slightly shifted by 5, and the proportion of obtuse-angle type magnetic heads is increased. To increase the yield of heads.

[Requirements of the Invention 1] As explained above, the rotating magnetic head of the present invention and the iNR method for manufacturing the same can be used for solid recording by using an obtuse type magnetic head for solid recording. The width by which the recorded edge track area is erased can be reduced, and the S/N ratio when recording and reproducing the magnetic tape can be improved.

In addition, by setting the reference plane during manufacturing so that the proportion of such obtuse-angle type magnetic heads increases, the yield of rotating magnetic heads useful for solid recording can be improved and productivity can be increased. be.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a rotating magnetic head showing an embodiment of the present invention, Fig. 2 is an enlarged view of the magnetic gap of the rotating U-magnetic head, and Fig. 3 shows the displacement, angle, and erase width of recording tracks. FIG. 4 is a schematic diagram of the JI method for manufacturing a magnetic head, FIG. 5 is an explanatory diagram of a solid recording track, and FIG. 6 is an explanatory diagram of a magnetic head. In the figure, 1.2 is a single crystal ferrite, 3 is a sendust layer 4 which is a magnetic gap, 5 is a glass layer, and θ1 θ2 is a deviation angle.

Claims (1)

[Claims] (1) A rotating magnetic head in which a first core chip and a second core chip are butted against each other, and a gap formed on the abutting surfaces has an inclined azimuth angle, characterized in that the deviation of the abutting surfaces is of an obtuse angle type. Rotating magnetic head for recording (2) The abutting surfaces of the first and second cores constituting the gip of the magnetic head are arranged so as to be slightly deviated from the center position, and an obtuse type is placed in the finished product. A method for manufacturing a rotating magnetic head, characterized in that the probability that a rotating head exists is increased.