JPS6032256B2 - How to assemble a magnetic head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for assembling a magnetic head device, and in particular, after a head piece is attached to a head substrate, azimuth adjustment and track alignment of the head piece are performed with respect to a frame to which the head substrate is attached. After that, we propose a method for assembling a magnetic head device in which these are connected via a supporting spring plate.

2. Description of the Related Art Conventionally, as a centrifugal force type magnetic head device for a video tape recorder, the one shown in FIG. 1 has been known.

That is, this magnetic head device 1 includes a frame 2 attached to a rotating member such as a rotating drum, a head substrate 5 attached to this frame 2 via two support spring plates 3 and 4, and a head substrate 5 attached to the tip of this head substrate 5. It consists of a head piece 6 attached. These are integrally connected using a predetermined jig using the frame surface as a reference plane. Therefore, the track position and azimuth relative to the frame are approximately properly adjusted. However, in reality, when cutting the head pieces 6 into fragments from the rod-shaped core, the cutting accuracy deteriorates, or when attaching the head pieces 6 to the head substrate 5, dust may be generated between them. If dust adheres to the magnetic head, it is no longer possible to perform the azimuth adjustment or track alignment after changing the type of magnetic head device. In other words, the relationship of the headpiece 6 to the frame 2 remains fixed and therefore there is no adjustment between them. Therefore, it was necessary to improve the cutting precision of the above-mentioned head pieces and the line density of the pasting work. In particular, in recent years, video tape recorders and the like that require highly efficient recording and reproduction have come to require azimuth accuracy within ±10'. In the present invention, even if the cutting accuracy deteriorates to some extent or dust is present between the head piece and the head substrate,
Adjust the azimuth and track alignment using the frame 2 above.
The present invention proposes a new technique that ultimately allows the head piece 5 to be appropriately positioned in relation to the frame 2 by performing this process when attaching the head board 5 via the springs 3 and 4. .

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.

First, FIG. 2 is a perspective view of each component showing the process of assembling the magnetic head device constituting the present invention. First, the above-mentioned head substrate 5 and head piece 6 are prepared. They are attached to each other in the same way.

Note that on one side of the head substrate 5, excluding the tip where the head piece 6 is attached, there are iron matching grooves 7 of the spring plates 3 and 4.
8 is provided. Further, a notch 9 is also provided in the head substrate 5 at a position corresponding to the hollow portion (between the two pole cores) of the attached head piece 6 to facilitate the coil winding bag operation in the next step. 10 is the coil.

Next, the head substrate 5 with the coil 10 wound thereon and the frame 2 having Fujiai grooves 11 and 12 for supporting the spring plates 3 and 4 are prepared, and the frame 2 is assembled as shown in FIGS. 2 and 3. 2 is placed on the fixed jig 13, and the head substrate 5 is placed on the movable holder 14. The jig 13 is fixed to the azimuth adjustment jig A, and its mounting surface is configured to precisely accommodate the frame 2. On the other hand, the moving jig 14 is configured to fix the head board 5 with a stopper (not shown), and its base is fixed to the rotating shaft body 15 of the azimuth adjustment jig device A. A support ring 16 that supports the rotating shaft 15 is fixed on a drive plate 17 that can be raised and lowered and can be moved back and forth and left and right. In other words, the gap azimuth of the head piece attached to the head substrate 5 on the movable band member 14 can be arbitrarily varied with respect to the frame 2, and track alignment can be performed.
The moving jig 14 is opposed to the fixing jig 13 so that the center 0 of the head piece 6 coincides with the center line X of the frame 2, as shown in FIG. Also,
The azimuth adjustment pick-up A is equipped with a drum 19 having a magnetic tape 18 facing on its circumferential surface, and the magnetic tape 18 is arranged so that the gap portion 6a of the head piece 6 is covered with the magnetic tape 18. On the other hand, the magnetic tape 18 has a master head 20 disposed at the most appropriate azimuth and track height.
is in close contact with the master head 20 so that maximum output can always be obtained from the master head 20. That is, with respect to the frame 2 mounted on the fixed pick-up tool 13, the head substrate 5, which is separately housed in the moving jig 14, is moved in any direction in the front, back, left, right, and up and down directions of the drive plate 17. The track height and azimuth of the head piece 6 are adjusted by any rotational operation of the rotary shaft body 15.

This adjustment is performed based on the level of the reproduction output from the coil 10 of the head piece.
This can be done manually or automatically, compared to the output of 0. When the reproduction output from the coil 10 of the head piece is at its maximum, the spring plates 3,
4 is carried in and stretched, and finally the above-mentioned mating portion is fixed with adhesive. Therefore, by using a master head that serves as a reference of a standard prepared in advance, the magnetic head devices described above can be reliably produced with uniform performance and high output. That is, according to the present invention, if there is some inaccuracy in cutting the head core block, or if the head piece and the head substrate are bonded together,
Even if these are not perfectly smoothly combined, the magnetic head device after being integrally combined has perfectly azimuth adjustment and is compatible. As described above, the present invention
A head mounting member having a reference surface is attached to the fixed member of the azimuth adjustment jig, and the azimuth is located at a position opposite to the head mounting member and is configured to be movable in front and rear, left and right, up and down directions, and rotational directions. A head board having a head piece is attached to the moving member of the adjustment member, and the moving part is moved to adjust the output level of the signal reproduced from the magnetic tape that is in contact with the head piece. The head board is fixed to the head mounting member via an elastic support plate while the azimuth of the head gap is adjusted in comparison with the reference reproduction signal from the traversing master head. This provides excellent azimuth accuracy. An excellent magnetic head device that does not require adjustment of the track height position can be provided on the market.

[Brief explanation of the drawing]

The figure shows a method of assembling a magnetic head device according to the present invention,
Figure 1 is a perspective view of the completed magnetic head device, Figure 2 is a perspective view of the components showing the assembly process, Figure 3 is a schematic plan view of the azimuth adjustment device, and Figure 4 is the same azimuth adjustment. FIG. 3 is a front view showing the relationship between two jigs of the device. A: Azimuth adjustment, 1: Magnetic head attachment, 2: Head mounting member, 3, 4.
...Elastic plate, 5...Head board, 6...
・Headpiece. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A head mounting member having a reference surface is attached to the fixed member of the azimuth adjustment jig, and the azimuth is located at a position opposite to the head mounting member and is configured to be movable in the front and rear, left and right, vertical and rotational directions. A head board having a head piece is attached to the moving member of the adjustment jig, and the moving member is moved to adjust the output level of the signal reproduced from the magnetic tape that is in contact with the head piece to the master head that is in contact with the magnetic tape. A method for assembling a magnetic head device, in which the head substrate is fixed to the head mounting member via an elastic support plate with the azimuth of the head gap adjusted in comparison with a reference reproduction signal from the magnetic head.