JPS6177120A - Method and device for azimuth adjustment of rotary reverse type magnetic head - Google Patents

Abstract

PURPOSE:To attain easily and accurately azimuth adjustment by moving a holder along a straight line which passes through the center of rotation of a rotating body by eliminating a position shift which is made during the azimuth adjustment between a tape guide and a magnetic tape for inspection. CONSTITUTION:The magnetic tape 13 for inspection which is little bit narrower in width than a magnetic tape 7 in use, and run in a direction A, and a gap line alpha is set at right angles to the tape traveling direction while looking at the playback output of a magnetic head 9 for sound recording. The rotating body 2 and holder 6 are rotated by a fine angle theta according to the clamping quantity of an adjusting screw 4 and azimuth deviation in the tape traveling direction (arrow A) is adjusted. The tape guide 8 at a distance apart from the center P of rotation is displaced considerably upward and downward and the tape guide 8 and magnetic tape 13 for inspection shifts in center position upward and downward by DELTAx. This position shift is eliminated by moving the holder to and away from the rotating body, so the azimuth adjustment is made easily and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention rotates a rotating body and a holding body in forward and reverse directions to move a magnetic head attached to a holding body to tracks in the forward and backward directions of a magnetic tape. The present invention relates to a rotating reverse type magnetic head that can be selectively positioned in a trunk, and more particularly to a method and apparatus for adjusting the azimuth thereof.

[Background of the invention]

2. Description of the Related Art Hitherto, auto-reverse type tape recorders have employed 1) rotary reverse type magnetic heads as shown in FIGS. 5 and 6;

Fig. 5 is an exploded perspective view, and Fig. 6 is a front view. In these figures, ■ indicates the main body (not shown) of the tape recorder K.
The fixed support base 2 is a disk-shaped rotating body rotatably supported by the support base 1, and the rotating body 2 is selectively rotated forward or reverse by a rotation drive mechanism (not shown). It has become.

Two adjusting screws 4 and 5 are screwed into the upper wall of the support stand 2 at a predetermined interval via a leaf spring 3, and the lower ends of both adjustment screws 4 and 5 are connected to the upper wall of the support stand 2. Rotating body 2 through the wall
It has reached the vicinity of . On the other hand, a protrusion 2a is integrally formed on a part of the outer peripheral edge of the rotor 2, and the rotation stop angle of the rotor 2 is regulated by the collision between the protrusion 2a and the adjustment screws 4 and 5. It has become so.

Reference numeral 6 denotes a holder, and a tape guide 8 for guiding the running of the magnetic tape 70, a recording/reproducing magnetic head 9, and an erasing magnetic head 10 are fixed to the holder 6, respectively. The holding body 6 is attached to the rotating body 2 by two screws 1) and 12, and is selectively rotated in the reverse direction in conjunction with the rotating body 2.

When recording and reproducing with the rotating reverse type magnetic head constructed as described above, the running direction of the magnetic tape 70 and the relative position of each magnetic head 9.degree. 10 with respect to the magnetic tape 7 are selected respectively. That is, when recording from the state shown in FIG. 6, the magnetic tape 7 is run in the direction of the arrow in the figure, erased by the erasing magnetic head 10, and then the lower side of the magnetic tape 7 is moved by the recording/reproducing magnetic head 9. track. In addition, when reproducing, the recording/reproducing magnetic head 9
only operate.

On the other hand, when the magnetic tape 7 is to be run in the direction of arrow B in FIG. Both magnetic heads 9 and 10 are positioned on the upper track of the magnetic tape 7 by bringing them into contact with the screw 5, and recording or reproduction is performed.

In this manner, in the rotational reverse type magnetic head, the magnetic head 9°IQ changes between the upper and lower directions depending on the running direction of the magnetic tape 7.
Since it is rotated and displaced to different positions, it is necessary that there be no azimuth deviation at each position, and adjustments are made for this purpose. Hereinafter, the azimuth adjustment method in the above-mentioned conventional example will be explained based on FIGS. 7 to 9.

When recording on or reproducing from the magnetic tape 7, the gap line of the recording/reproducing magnetic head 9 is basically perpendicular to the longitudinal direction of the track. For this reason, the tape guide 8 and both magnetic heads 9. When installing to and 5[,
After fixing both magnetic heads 9 and 10 to the holder 6, a reference imaginary line β is drawn at right angles to the gap line α of the recording/reproducing magnetic head 9, and the tape guide 8 is drawn with respect to the reference imaginary line β.
Fix the tape guide 8 to the holder 6 so that the tape guide 8 is in a predetermined positional relationship. The distance j1 is set to be 0.08±o, os, m).

After fixing the tape guide 8 and both magnetic heads 9 and 10 to the holder 6 in a predetermined positional relationship in this manner, the holder 6 is fixed to the holder 6 with the screws 1). 12 to fix it to the rotating body 2.

Next, as shown in FIG. 8, the magnetic tape used, 8.
. 5 Same width as 7 (current standard is 3.81 mm)
), using a test magnetic tape 13 on which a total of four measurement tracks are recorded on the top and bottom, the test magnetic tape 13 is
is run in the direction of the arrow in the figure, and while watching the reproduction signal output from the recording/reproducing magnetic head 9, the gap line α of the recording/reproducing magnetic head 9 is aligned at right angles to the tape running direction. This work is done by turning the adjustment screw 4 shown in Figure 6, which was explained earlier, in either the forward or reverse direction. ! (
The rotation stop angle of the rotating body 2 by S2a may be finely adjusted.

For example, in order to correctly adjust the gap line α of the recording/reproducing magnetic head 9, which is tilted in the direction shown in FIG. 7 at the rotation stop position, as shown in FIG. The holder 6 is rotated by a small angle θ in the counterclockwise direction shown in the figure to adjust the azimuth deviation in one tape running direction (in the direction of the arrow).

Next, move the rotating body 2 and the holding body 6 about 1 in the clockwise direction as shown in the figure.
By rotating 80 degrees and bringing the protrusion 2a into contact with the lower end of the other adjusting screw 5, both magnetic heads 9 and 10 are positioned upward as shown in FIG. Then, at this rotation stop position, the test magnetic tape 13 is run in the direction of arrow B in the figure, and while observing the playback output of the recording/playback magnetic head 9,
The gap line α of the recording/reproducing magnetic head 9 is aligned perpendicular to the tape running direction. This work is the same as the work described above, except that the rotating body 2 and the holder 6 are rotated by the adjusting screw 5 instead of the adjusting screw 4, and by kneading, the other tape running direction (direction of arrow B) is rotated. Adjust the azimuth deviation in.

However, in the above-mentioned prior art (1, holder 6
Tape guide 8 and both magnetic heads 9.10 attached to
are located at predetermined distances from the rotation center P of the rotating body 2 and the holder 60, so the azimuth adjustment of the recording/reproducing main magnetic head 9 is performed by rotating the holder 6 around point P.
In addition to A, the tape guide 8 located further away from the center of rotation P may also fluctuate, and the center of the tape guide 8 may be offset from the center of the magnetic tape 13 for inspection. If the tape guide 8 is greatly misaligned in this way,
According to the current standards, the width of the magnetic tape 13 for inspection is t'! 3.81+0m
m, the end of the running magnetic tape 7 or test magnetic tape 13 will strongly contact the tape guide 8 and be deformed, making it impossible to perform normal recording playback or accurate azimuth adjustment. There was a drawback.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for adjusting the azimuth of a rotating reverse type magnetic head, which can easily and accurately adjust the azimuth, while eliminating the drawbacks of the prior art described above.

[Summary of the invention]

To achieve this objective, the present invention corrects the positional deviation between the tape guide and the inspection magnetic tape that occurs during azimuth adjustment by moving the holder along a straight line passing through the center of rotation of the rotating body. There is a zero sign at the point where it is done like this.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a rotating reverse type magnetic head according to an embodiment of the present invention, and FIG. 2 is a perspective view of a part of the holder shown in FIG. Portions corresponding to the explained ff15 diagram are given the same reference numerals.

In this FIG. 1 VC, reference numeral 14 denotes a ring-shaped convex portion provided integrally with the rotating body 2, and the convex portions 14 are provided at opposing positions on a straight line passing through the center of rotation of the rotating body 2. A screw hole 15 is provided at the center of each convex portion 14.

On the other hand, elongated through holes 16 are provided at two locations on the upper and lower sides of the holding body 6.
A recess 17 is provided on the back side of the holder 6 at the outlet of each of the page through holes 16. Although the kneading recess 17 is not visible in FIG. 1 when the holder 6 is viewed from the front, it has an oval shape as shown in FIG. 2 when the holder 6 is viewed from the back. The longitudinal directions of the protrusions 14 are on the same line, and the widthwise dimension of each protrusion 14 is set to be slightly thicker than the outer diameter dimension of the convex portion 14 .

The holding body 6 configured in this manner has the concave portion 17 connected to the convex portion 14.
After fitting, the screws 1) and 12 are passed through the through hole 16 and screwed into the screw hole 15 to be fixed to the rotating body 2.

At this time, do not completely tighten screws 1) and 12, and
When the holding body 6 and the holding body 6 are temporarily fixed, the fitting between the convex portion 14 and the concave portion 17 allows the both 2 and 6 to be slid a small distance along a straight line passing through the center of rotation of the rotating body 2.

Next, a method for adjusting the azimuth in the rotational reverse type magnetic head having the above structure will be explained.

Also in the azimuth adjustment method in this embodiment, in advance,
Tape guide 8 and both magnetic heads 9. lO is fixed to the holder 6 in a predetermined positional relationship. That is, as described above, a reference imaginary line β is drawn perpendicularly to the gap line α of the recording/reproducing magnetic head 9, and the lower guide end of the tape guide 8 is set at 0. 08±o,os
The tape guide 8 and both magnetic heads 9 and 10 are respectively attached to the holder 6 so that the distance is 2 mm (see FIG. 7).

Next, the concave portions 17 provided on the back surface of the holding body 6 are fitted into the convex portions 14 provided on the rotating body 2, and the screws 1). 12 is screwed into the screw hole 15 through the through hole 16, thereby fixing the holder 6 to the rotating body 2. This fixation is not very strong, and may be merely a temporary fixation in which the holding body and the rotating body 2 do not move.

Next, as shown in FIG.
Width (current standard: 3.81±ll-o It mm
), using a test magnetic tape 13 that is somewhat narrower than (...).
This is run in the direction of the arrow in the figure, and the recording/reproducing magnetic head 9
While watching the playback output, align the gap line α of the recording/playback magnetic head 9 at right angles to the tape running direction. This work is performed by rotating the integrated rotating body 2 and holding body 6 by a minute angle θ depending on the amount of tightening of the adjusting screw 4, as in the prior art explained earlier. Azimuth deviation in the tape running direction (arrow A direction) is adjusted.

At this time, the tape guide 8, which is farther from the rotation center P than the recording/reproducing magnetic head 9, is displaced more vertically than the recording/reproducing magnetic head 9 due to the 60 rotations of the holder, and therefore The center position of the guide 8 and the center position of the inspection magnetic tape 13 are shifted by ΔX in the vertical direction.

In such a case, loosen both screws 1) and 12 and remove the holder 6.
The fitting between the concave portion 17 and the convex portion 14 allows the rotor to slide over the rotating body 2. And, as shown in Figure 4,
The holder 6 is moved along a straight line passing through the rotation center P of the rotating body 20 so that the center of the magnetic tape 13 for inspection and the center of the tape guide 8 coincide, that is, the above-mentioned ΔX becomes O. In this state, firmly tighten both screws 1) and 12 to permanently fix the holding body 6 to the rotating body 2 (in some cases,
Screw 1). 12 may be permanently fixed using adhesive to prevent it from loosening).

Note that the azimuth adjustment in the tape running direction opposite to the above has already been performed by adjusting the rotation center P of the holder 60.
Since the relative positional relationship between the tape guide 8 and the recording/reproducing magnetic head 9 is shown accurately, simply rotate the rotating body 2 approximately 180 degrees clockwise in the figure, and then turn the adjusting screw 5.
The amount of tightening can be adjusted so that the gap line α of the recording/reproducing magnetic head 9 is perpendicular to the upper track of the test magnetic tape 13 running in the direction opposite to the arrow A.

In this way, the azimuth adjustment in the forward and backward directions is performed, and the inspection magnetic tape 1 used for such adjustment is
As explained earlier, the tape width of 3 is slightly shorter than the tape width of the magnetic tape 7 that is actually used, specifically, the tape width is 3, OO~3.70 +t++n
It is recommended to use the magnetic tape 13 for inspection. That is, in the above embodiment, the tape guide 8 and the inspection magnetic tape 13
Although the center positions R of each of the positions R are almost the same when the adjustment is completed, they are shifted by ΔX during the adjustment stage. Therefore, as in the past, the width is the same as that of the magnetic tape 7 (3,76~
The test magnetic tape 13 of 3.81 mm) is strongly contacted with the field 8 and deformed, and as a result, the playback output signal from the recording/playback magnetic head 9 fluctuates, making accurate azimuth adjustment difficult. Be elegant.

On the other hand, the tape width is 3. OO~3.70 mm, in other words, when using the inspection magnetic tape 13 which is 0.12 to 0.87 mm shorter than the tape guide 8 whose guide width is 3.82 to 3.87 mm, Deformation of the magnetic tape 13 can be prevented and accurate azimuth adjustment becomes possible. Note that if a test magnetic tape 13 with a tape width of less than 3.00 mff1 is used, the test magnetic tape 13 will move significantly in the vertical direction during tape running, causing the recording/reproducing hunting head 9 to deviate from the measurement track. Therefore, in order to reliably obtain a playback output from the recording/playback magnetic head 9, the lower limit of the tape width of the test magnetic tape 13 is 3.5mm. OOmm is appropriate.

In the above embodiment, the circular convex portion 14 provided on the rotating body 2 and the oval concave portion 17 provided on the holding body 6 fit together, so that the holding body 6 is aligned with a straight line passing through the center of rotation of the rotating body 2. Although the explanation has been given on a device that can be moved along
The rotating body 2 may be provided with an elongated recess, and the holding body 6 may be provided with a protrusion that is movable along the recess.

〔Effect of the invention〕

As explained above, according to the present invention, the positional misalignment between the tape guide and the inspection magnetic tape that occurs during azimuth adjustment can be eliminated by moving the holding body relative to the rotating body. can be done easily and accurately.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a rotating reverse type magnetic head according to an embodiment of the present invention, FIG. 2 is a perspective view of a part of the holder shown in FIG. FIG. 4 is an explanatory diagram showing the azimuth adjustment method according to the present invention, FIG. 5 is an exploded perspective view of a conventional rotating reverse type magnetic head, FIG. 6 is a front view thereof, and FIGS. 7, 8, and 9. FIG. 2 is an explanatory diagram showing a conventional azimuth adjustment method. 1... Support stand, 2... Rotating body, 2a.
... Protrusion, 3 ... Leaf spring, 4.5 ...
... Adjustment screw, 6 ... Holding body, 8 ...
・Tape guide, 9... Recording/playback magnetic head, 1
0...Magnetic head for erasing, 1). 12...
...Screw, 13...Magnetic head for inspection, 14.
...Protrusion, 15...Screw hole, 16...
...Through hole, 17...Recess. tIFj:l 12T 2 @ Sai3ku Sai4Sho'f5' Nagi76 Mouthsai 7121 i V'! ' B 79 views

Claims (4)

[Claims] (1) A rotating body capable of forward and reverse rotation having a center of rotation at the center of the magnetic tape, a holder fixed to the rotating body, and a magnetic head and a tape guide attached to the holder; In the method for adjusting the azimuth of a rotating reverse type magnetic head, the gap line of the magnetic head is aligned perpendicularly to the tape running direction of the magnetic tape by adjusting the rotation stop angle of the rotating body. Adjust the rotation stop angle of the rotating body while it is temporarily fixed to the body, thereby aligning the gap line of the magnetic head so that it is perpendicular to the tape running direction of the magnetic tape for inspection, and then moving the body along a straight line passing through the center of rotation of the rotating body, thereby
A method for adjusting the azimuth of a rotating reverse type magnetic head, comprising aligning the center of the tape guide with the center of a magnetic tape for inspection, and then permanently fixing the holding body to the rotating body. (2) In claim (1), the magnetic tape for inspection may be
．． A method for adjusting the azimuth of a rotating reverse type magnetic head, characterized in that a short magnetic tape having a width of 12 to 0.87 mm is used. (3) a rotating body capable of forward and reverse rotation with its rotation center located at the center of the magnetic tape, a holder fixed to the rotating body, and a magnetic head and tape guide attached to the holder;
A device comprising: a stopper that regulates a rotation stop angle of the rotating body; and adjusting the relative position between the stopper and the rotating body to adjust azimuth deviation of the magnetic head in forward and backward positions with respect to the magnetic tape. An azimuth adjustment device for a rotating reverse type magnetic head, characterized in that a guide means is provided for guiding the holding body along a straight line passing through the center of rotation of the rotary body. (4) In claim (3), the guide means is provided on either one of the rotating body and the holding body, and includes a recess that is elongated in a linear direction passing through the rotation center of the rotating body; 1. An azimuth adjustment device for a rotating reverse type magnetic head, comprising a convex portion provided on the other side and slidably fitted into the concave portion.