JPS628324A - Magnetic head - Google Patents

Abstract

PURPOSE:To effectively prevent the deterioration in recording and reproducing efficiency which arises from the environmental change of an adhesive material by providing a notch to the region of sliders except the surface to slide with a magnetic recording medium thereby decreasing the adhering area of cores and sliders. CONSTITUTION:The notch 13 is provided in a groove shape to the rear part of the sliders 4, 5 sandwiching the erasing core 3 and recording and reproducing core 10, i.e., the part without including the surface 8 to slide with the recording medium. Since the area of the adhering surface is decreased by the notch 13, the decrease of the recording and reproducing efficiency by the resin for adhesion as in the prior art and the consequent deterioration of the asymmetry of the reproduction output waveform are effectively prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a magnetic head, in particular, a magnetic head composed of a magnetic core and a slider that sandwiches the magnetic core, which is arranged so as to sandwich a magnetic recording medium. The present invention relates to a magnetic head that performs magnetic recording and reproduction on the surface of a medium.

[Prior Art] Conventionally, magnetic heads have been used in magnetic disk devices that record and reproduce information on both sides of magnetic disks, disks, such as floppy disks, which are well-known as flexible magnetic recording media. is well known.

The conventional structure of this magnetic head will be explained with reference to FIGS. 2 and 3.

Figure 2 shows a pair of catamaran-type magnetic heads.
FIG. The reference numeral 9 in FIG. 2 is an elastic plate made of stainless steel or copper alloy. A spatula is provided.

Here, FIG. 2 shows the part of the magnetic head on the sliding surface (hereinafter simply referred to as sliding surface) side of the magnetic disk, and the illustration and description of the part provided on the opposite side of the elastic plate 9 will be omitted. .

The magnetic head 1 has a recording/reproducing core 2 formed into a thin plate shape, and a magnetic gap 2a is formed on the upper end surface of the recording/reproducing core 2 facing the sliding surface, and reinforcing plates 10 are formed on both sides of the magnetic gap 2a. .10'.

Also, those indicated by symbols 3 and 3' are erased cores, respectively.
Similarly, it is formed into a thin plate shape, and magnetic gaps 3a and 3a' are formed on the upper end face facing the sliding surface, and the reinforcing plate 11 is held between them. The erasing cores 3, 3' are provided side by side with the recording/reproducing core 2, with their end faces abutted against the end faces of the reinforcing plates 10, 10'.

The above-mentioned recording/reproducing core and erasing core are held between sliders indicated by reference numeral 4.5. The slider 4.5 supports and reinforces the above-mentioned cores 2 and 3 on the elastic plate 9, and also allows the cores 2 and 3 to slide smoothly on a floppy disk (not shown). The sliders 4 and 5 are reinforcing plates 10.10" on both sides of the recording/reproducing core 2, the erasing core 3,
It is fixed by adhesive so as to sandwich 3'.

The slider 4 on one side is formed into a rectangular thick plate shape and has a sliding surface 7 flush with both the cores 2 and 3. The other slider is formed in the shape of a rectangular parallelepiped block with a larger width than the slider 4, and similarly has a sliding surface 8 that is flush with both cores 2 and 3. A wide groove 6 is formed parallel to the cores on the side closer to both cores 2.3 from the center. Therefore, when the entire magnetic head 1 is viewed as a block, the recording/reproducing core 2 and the erasing core 3,3' are arranged at positions closer to one side than the center.

The magnetic head configured as shown in FIG. 2 performs recording and reproduction by pressing against a magnetic disk 12, which is a magnetic recording medium, from both sides as shown in FIG.

3 is the same magnetic head as in FIG. 2, and on the opposite side of the magnetic disk 12, a magnetic head 1' having exactly the same structure is placed on an elastic plate 9'. It is located. The magnetic head 1' is the magnetic head 1 described above.
It has the same structure as , but the reference numerals of each part in the figure are distinguished by a dash.

As shown in the figure, each of the recording heads l and 1' has a recording/reproducing core and an erasing core arranged at positions shifted to the left and right from the center position, and a track width of A is secured on both the front and back sides of the magnetic disk 12. It is configured like this. While rotating the magnetic disk 12, the recording and reproducing cores 2 and 2' of the magnetic heads l and 1' and the magnetic gaps of the erasing cores 3 and 3' are used to record tracks at different positions on both the upper and lower surfaces of the magnetic disk 12. Information can be recorded, reproduced, or erased by sliding contact.

[Problems to be Solved by the Invention] In this type of magnetic head described above, the magnetic core is held and fixed by the slider using adhesive such as epoxy resin. There is a drawback that the dimensional accuracy after bonding is unstable due to such reasons. In particular, the contactability of the recording medium changes due to seepage of the resin, which deteriorates the recording and reproducing efficiency. As a result, leakage magnetic flux from the erasing core 3 interferes with the recording/reproducing magnetic flux, resulting in problems such as extremely aggravating recording/reproducing asymmetry.

[Means for Solving the Problems] In order to solve the above problems, the present invention consists of a magnetic core and a slider that adhesively holds the magnetic core, and performs magnetic recording and reproduction by slidingly contacting a magnetic recording medium. In the magnetic head, a notch portion is provided in an area other than the sliding surface of the magnetic recording medium of the slider to reduce the bonding area between the core and the slider.

[Function] Cutouts 13 are provided at the rear of the sliders 4 and 5 that fix the cores via reinforcing plates, as shown in FIG. 1, and the area of the adhesive surface is reduced, thereby reducing the amount of adhesive used.
To prevent deterioration of recording and reproducing efficiency as described above.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings. However, in the following, an example relating to the catamaran type magnetic head will be exemplified. In the drawings referred to below, the same or corresponding members as in FIGS. 2 and 3 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 shows the structure of a magnetic head 1 according to an embodiment of the invention.

As shown in the figure, in this embodiment, the erase core 3
A notch 13 is provided in the form of a groove at the rear of the slider 4.5 that holds the recording/reproducing core 10, that is, at a portion that does not include the recording medium sliding surface 8. The structure of other parts is the same as that of the conventional example.

Adhesion of the magnetic core to the slider is carried out by applying an adhesive only to the part without the notch 13, and only to this part.

The magnetic head shown in FIG. 1 can be used in the same manner as described above to perform magnetic recording and reproducing, but since the area of the adhesive surface is reduced by the notch 13, adhesive resin cannot be used as in the conventional example described above. A decrease in recording/reproduction efficiency and a deterioration in the asymmetry of the reproduction output waveform due to this are effectively prevented.

The above example uses a catamaran type magnetic head, but
The present invention can be implemented in various magnetic heads in which a core is held and fixed by sliders.

[Effect] As is clear from the above description, according to the present invention, in a magnetic head that is composed of a magnetic core and a slider adhesively sandwiching the magnetic core, and performs magnetic recording and reproduction by slidingly contacting a magnetic recording medium, A notch is provided in the area of the slider other than the sliding surface of the magnetic recording medium, and the adhesive area between the core and the slider is reduced, which effectively reduces the deterioration of recording and reproducing efficiency caused by environmental changes in the adhesive material. Therefore, it is possible to provide an excellent magnetic head with high reliability that can prevent the above-mentioned problems.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of main parts showing the structure of a magnetic head according to the present invention, FIG. 2 is a perspective view showing the structure of a conventional magnetic head,
FIG. 3 is a sectional view illustrating the recording and reproducing operation by the magnetic head of FIG. 2. FIG. 1... Magnetic head 2... Recording/reproducing core 2a
, 3a...Magnetic gap 3...Erasing core 4, 5...Slider 6...
・Groove 9...Elastic plate 10.11...Reinforcement plate 12...Disk 13...Notch 1
4.15...Break plate 31in

Claims (1)

[Claims] Consists of a magnetic core and a slider that adhesively holds the magnetic core.
A magnetic head that performs magnetic recording and reproducing by slidingly contacting a magnetic recording medium, characterized in that a notch is provided in an area of the slider other than the sliding surface of the magnetic recording medium to reduce the bonding area between the core and the slider. magnetic head.