JPH0325289Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head holding metal plate that blocks eddy currents in the holding metal plate.

Conventionally, a magnetic head for recording and reproducing information signals on a magnetic disk has a recording/reproducing gap 4 as shown in Fig. 2.
A pair of erasing cores 9 to 12 having erasing gaps 7 and 8 are disposed on both sides of recording and reproducing cores 5 and 6 having a width of 1.5 mm to form a magnetic head chip. The recording/reproducing cores 5 and 6 and erasing cores 9 to 12 are inserted into the rectangular core protrusion hole 2a of the holding metal plate 2 shown in FIG. It is fixed in place.

When the magnetic head 1 is placed and fixed on the holding metal plate 2 as described above, an eddy current Vi is generated in the holding metal plate by the magnetic flux of the recording/reproducing core of the magnetic head, and the third harmonic component of the recording/reproducing signal is generated. These losses are especially large, and as a result, the resolution of the magnetic head, that is, the frequency characteristics, deteriorates, resulting in an increase in errors and a reduction in reproduction output.

In view of the above-mentioned drawbacks, the purpose of the present invention is to provide a notch in the core protrusion hole of the holding metal plate to cut the eddy current loop, prevent the generation of eddy current, and improve the frequency characteristics of the magnetic head. A further object of the present invention is to propose a magnetic head holding metal plate in which a reduction in fixing strength of the magnetic head is minimized by forming a notch.

The present invention is characterized by comprising a recording/reproducing core having a recording/reproducing gap and an erasing core having erasing gaps for erasing both sides of a recording track recorded by the recording/reproducing gap, and the erasing core having both sides of the erasing core. A magnetic head whose outer side is sandwiched between a wide slider and a narrow slider is provided with a core protrusion hole through which the recording/reproducing core and erasing core protrude, and a plurality of core protrusion holes located around the protrusion hole. In the magnetic head holding metal plate, the recording/reproducing core and the erasing core are made to protrude from the core protrusion hole and the magnetic head is placed and fixed on the metal plate having a long hole. Eddy currents are prevented by forming a notch so as to be continuous with the elongated hole located on the narrow slider side.

The present invention will be explained below with reference to illustrated embodiments. As shown in FIGS. 3 to 5, the magnetic head 1 is mounted and fixed on the magnetic head holding metal plate 2. As shown in FIGS.

As shown in FIG. 2, the magnetic head 1 includes recording/reproducing cores 5 and 6 made of ferrite material having a recording/reproducing gap 4, and a magnetic disk (not shown) on which information is recorded by the recording/reproducing gap 4. A magnetic head chip is formed by erase cores 9, 10, 11, 12 made of ferrite material or the like and having a pair of erase gaps 7, 8 for erasing both sides of the recording track, and ceramic sliders 13, 14, 15. It is formed into a rectangular body by being sandwiched between a wide slider 16 and a narrow slider 17 made of ceramic material or the like on both sides.

The holding metal plate 2 is formed of a thin spring plate material as shown in FIG. 6, and has a rectangular core protruding hole 2a in the center.
A notch 2c is formed so as to be continuous with a plurality of elongated holes 2b located around the core protrusion hole 2a and a narrow elongated hole 2b' located on the slider side.

When the magnetic head 1 is fixed to the holding metal plate 2, the recording/reproducing cores 5, 6 and erasing cores 9 to 12, around which the recording/reproducing coil 18 and erasing coil 19 are wound, are inserted into the core protruding hole 2a. The recording and reproducing cores 5 and 6 are insulated from the holding metal plate 2, and as shown in FIG. 1, the recording and reproducing coil 18 and the erasing coil 19 are fitted to the cores 6 and 1012, respectively, and the back cores 20 and 21 are fixed, respectively. The ends of the coils 18 and 19 are connected to the terminals of the lead wires 22 as shown in FIG.

When the holding metal plate 2 of the magnetic head 1 is formed as described above, the loop of eddy current around the core protruding hole 2a generated in the holding metal plate 2 by the recording/reproducing cores 5 and 6 is formed at the notch 2c. , in the plurality of long holes 2b,
In particular, the elongated hole 2b' connected to the notch 2c prevents the generation of the eddy current, preventing the loss of the third harmonic component of the recording/playback signal due to the generation of eddy current, and improving the resolution, that is, the frequency characteristics of the head. improved, errors are reduced, and reductions in playback output are prevented.

Furthermore, since the notch 2c is formed so as to be continuous with the core protruding hole 2a and the elongated hole 2b' located on the narrow slider side, there is no notch on the wide slider side. As shown in Figure 4, all parts of the wide slider placed on the holding metal plate 2 are placed and fixed in contact with the holding metal plate, which minimizes the reduction in fixing strength. .

In other words, if a notch is drilled so as to be continuous with the core protrusion hole and the long hole located on the wide slider side, the slider and the metal plate will not fit together because the slider corresponding to the notch is wide. This is because the area where the slider and the metal plate do not come in contact becomes larger, and as a result, the contact area between the slider and the metal plate becomes smaller, and the fixing strength also decreases accordingly.

Since the present invention is configured as described above, it has a simple configuration in which a notch is formed so as to be continuous with the core protrusion hole into which the recording/reproducing core is inserted and fixed and the elongated hole located on the narrow slider side. The eddy current loop is cut and the generation of eddy current is prevented, and the resolution and frequency characteristics of the magnetic head are significantly improved.
It is possible to provide a magnetic head holding metal plate which has excellent practical effects such as preventing a reduction in reproduction output, and which can also reduce the reduction in the strength of fixing the magnetic head to the holding metal plate due to the notch.

[Brief explanation of the drawing]

Figure 1 is an exploded external perspective view of a magnetic head fixed to a conventional holding metal plate, Figure 2 is an external perspective view of the magnetic head, and Figure 3 is a magnetic head fixed to a holding metal plate of the present invention. 4 is a side view of the same, FIG. 5 is a back view of the same, and FIG. 6 is a plan view of the holding metal plate of the present invention. DESCRIPTION OF SYMBOLS 1... Magnetic head, 2... Holding metal plate, 2a... Core protrusion hole, 2c, 2d, 2e, 2f, 3b... Notch, 4... Gap for recording/reproduction, 5, 6... Core for recording/reproduction, 7, 8... Erasing gap, 9-12... Erasing core, 16, 17... Slider.

Claims (1)

[Claims for Utility Model Registration] A recording/reproducing core having a recording/reproducing gap and an erasing core having an erasing gap for erasing both sides of a recording track recorded by the recording/reproducing gap, said erasing core. A magnetic head whose both outer sides are sandwiched between a wide slider and a narrow slider is provided with a core protrusion hole through which the recording/reproducing core and erasing core protrude, and a plurality of core protrusion holes located around the protrusion hole. In the magnetic head holding metal plate, the recording/reproducing core and the erasing core are made to protrude from the core protrusion hole, and the magnetic head is placed and fixed on the metal plate having a long hole. A magnetic head holding metal plate characterized in that a notch is formed so as to be continuous with the elongated hole located on the narrow slider side.