JPS62125570A - Magnetic head device - Google Patents

Abstract

PURPOSE:To concentrate the pressing force that puts a gap part close to a medium at the gap part and to prevent the gap variance of the gap part, by providing a projection which functions to press the medium to a gap at the position when the medium rubbing faces of both magnetic heads set opposite to each other are opposite to the magnetic gap parts of the magnetic cores of both heads. CONSTITUTION:The medium rubbing faces 7a and 8a of sliders 7 and 8 of both magnetic heads 10 are set opposite to each other. Then a record/ reproduction gap G1 is formed together with erasion gaps G2 and G3 respectively. Thus a magnetic head device is obtained. Then three hemispherical projections 15 are provided to the face 7a of the head 10. Both heads 10 containing projections 15 and set opposite to each other for formation of a magnetic head device. These projections 15 are set at the positions opposite to those gaps G1-G3 respectively. Thus a medium is concentrically set close to the gaps G1-G3 by means of those projections 15. This prevents the variance of the gaps G1-G3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head device, and in particular to a magnetic head device in which two magnetic heads disposed facing each other are brought into pressure contact with both the front and back sides of a magnetic recording medium, and are slid relative to the medium. The present invention relates to a magnetic head device that records and reproduces information by moving the magnetic head.

[Prior Art] In this type of magnetic head device, a magnetic head for a magnetic disk device uses a flexible magnetic disk, a so-called floppy disk, as a magnetic recording medium, and records and reproduces information on both the front and back sides (top and bottom) of the disk. This magnetic head device is widely used, and the conventional structure of the magnetic head of this magnetic head device is as shown in FIG.

As shown in FIG. 4, the magnetic head 10 is fixed on an elastic plate 9 and can be elastically swung through four L-shaped long holes 9a formed around the magnetic head fixing part of the elastic plate 9. It is supported by the following members.

The symbols 1, 2, and 3 are magnetic cores, respectively.
These are a recording/reproducing core and an erasing core, each of which has a recording/reproducing gap G1 and an erasing gap G2. It has G3.

Then, both sides of the recording/reproducing core 1 are sandwiched between reinforcing plates 4.4,
A magnetic core section 6 is constructed by arranging the recording/reproducing core 1 and the erasing cores 2 and 3 one after another along the medium sliding direction of arrow A, with a reinforcing plate 5 sandwiched between the erasing cores 2 and 3. has been done.

The magnetic head 10 is constructed by sandwiching the magnetic core portion 6 on both sides by sliders 7.8, which are sliding and reinforcing members, and fixing the entire magnetic core portion 6 onto an elastic plate 9 by adhesive or the like.

The slider 7 is formed in the shape of a rectangular block having a groove 7b on the upper surface in the figure, and the slider 8 is formed in the shape of a rectangular plate. The upper surface serves as medium sliding surfaces 7a, 8a, and 6a that slide uniformly on the medium.

The lower end portions (not shown) of the recording/reproducing core 1 and the erasing core 2.3 are inserted under the elastic plate 9, and a coil (not shown) is wound around these lower end portions.

Next, the main structure of a magnetic head device using the magnetic head having the above structure is shown in FIG.

5 is a carriage, which supports the entire apparatus and is driven along the radial direction of the medium 11 (left-right direction in the figure) by a driving means (not shown).

An arm 12 is cantilevered on the carriage 13 via a support member (not shown) so as to be elastically displaceable in the vertical direction, and is biased downward in the figure by a suppression spring 14.

The magnetic head 10.10 having the above-described structure is supported on the upper surface of the distal end of the carriage 13 and the lower surface of the distal end of the arm 12 by fixing respective elastic plates 9.9 with adhesive or the like. The magnetic head 10° 10 is arranged such that the magnetic core portions 6 and the medium sliding surfaces 6a and 7a of the slider 7 face each other with the medium 11 in between, and the suppressing spring 14
By pressing the arms 12 downward, the arms 12 are brought into pressure contact with the medium 11, and the medium 11 is pressed against each other. ing.

Based on the above structure, during recording and reproduction, the medium 11 is rotationally driven by a driving means (not shown), and the magnetic head 10.
Recording and reproduction are performed by sliding the ten gaps G1, G2 and G3 relative to the upper and lower surfaces of the medium 11.

[Problems to be Solved by the Invention] However, according to the above-described magnetic head device, the magnetic head 1
Since the medium sliding surface 7a of the slider 7 that presses the medium 11 against the medium sliding surface 6a of each magnetic core part 6 of 0.10 is a flat surface, the pressing force is equal to each gap Gl of the medium sliding surface 6a.
, G2, and parts other than G3 are dispersed and applied. For this reason, the pressing force that brings each gap portion into close contact with the medium 11 becomes weak, and there are cases in which fluctuations in the gap occur between the two. As is well known, when this gap becomes large, the recording, reproducing or erasing characteristics of the head deteriorate due to spacing loss.

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, two magnetic heads arranged facing each other as described above are brought into pressure contact with both the front and back sides of a magnetic recording medium. In a magnetic head device that records and reproduces information by sliding relative to each other, each fi body of the head [on one side, the medium is placed at a position facing the magnetic gap portion of the magnetic core of each head. A protrusion was provided to press the gap portion against the gap portion.

[Function] According to this structure, the magnetic recording medium is locally pressed against the magnetic gap part within the medium sliding surface of the magnetic head by the above-mentioned protrusion, so that the pressure that brings the medium and the magnetic gap part into close contact is exerted. Unlike before, the pressure is concentrated in the magnetic gap, and is much larger than before. Therefore, the adhesion between the magnetic gap portion and the medium is improved, and fluctuations in the air gap between the two are prevented.

[Example] Hereinafter, details of an example of the present invention will be described with reference to FIGS. 1 to 3. Here, the magnetic head device for the above-mentioned magnetic disk device is used as an embodiment, and FIG. 4 of the conventional example is shown in FIGS. 1 to 3.

The same reference numerals are given to the same or corresponding parts as in FIG. 5, and the explanation of the same parts will be omitted.

In this embodiment, only the structure of the slider 7 of the magnetic head 10 used is different from the conventional example, and as shown in FIG. is provided. Each of the protrusions 15 is connected to two magnetic heads to, 10 as shown in FIG.
are arranged facing each other as in the conventional example, and when recording and reproducing are carried out by press-contacting the upper and lower surfaces of the medium 11, the magnetic fields of the recording, reproducing core 1 and erasing core 2 and 3 of each head are Gap Gl, G2. It is arranged at a position facing each of G3.

According to such a structure, during recording and reproduction, the medium 11 which is bent as shown in an exaggerated manner in FIG.
A large deflection is removed by the planar portion of the entire sliding surface including the projections 15, and the recording/reproducing gap G1 and the erasing gaps G2 and G3 facing each other are formed by the protrusions 15, respectively.
is pressed on each of the parts.

Here, the medium 11 is locally moved to each gap Gl, within the medium sliding surface of the magnetic head 10 by each of the protrusions 15.
Since the pressure is applied to each of G2 and G3, the pressing force for bringing the medium 11 into close contact with each gap is concentrated at each gap, unlike in the past, and is significantly larger than in the past.

Therefore, the adhesion between each gap Gl, G2, G3 and the medium 11 is significantly improved compared to the conventional one, and fluctuations in the air gap between them can be prevented, and deterioration of the recording, reproducing or erasing characteristics of the magnetic head 10 due to spacing loss can be prevented. can.

Note that the shape and number of the protrusions 15 are not limited to those mentioned above; for example, as shown in the modified example of FIG. The pressure may be applied to each of the gaps Gl, G2, and G3 of the head in common.

Note that the structure in which the above-mentioned protrusions are provided on the medium sliding surface of the magnetic head is not limited to the magnetic head device for the magnetic disk device of the embodiment, but can also be used in flexible head devices of the type described in the industrial application field. Similar effects can be expected by applying this method to all devices that use various media.

[Effects] As is clear from the above description, according to the present invention, two magnetic heads disposed facing each other are brought into pressure contact with both the front and back surfaces of a magnetic recording medium, and are made to slide relative to the medium to read information. In a magnetic head device for recording and reproducing, a protrusion for pressing the medium against the gap portion is provided at a position facing the magnetic gap portion of the magnetic core of each head on the medium sliding surface of each of the heads. , the pressing force that brings the magnetic gap part and the medium into close contact is significantly greater than before, improving the adhesion between the medium and the magnetic gap, improving the recording, reproducing, or erasing characteristics of the head, and stably recording and reproducing. An excellent magnetic head device that can perform well can be provided.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of a magnetic head of a magnetic head device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a state in which the medium is suppressed by the device according to the embodiment, and FIG. 3 is a modification of the present embodiment. FIG. 4 is a perspective view of a magnetic head of a conventional magnetic head device, and FIG. 5 is a side view schematically showing the main structure of a conventional magnetic head device. 1... Recording/reproducing core 2.3... Erasing core 6a
, 7a, 8a...Medium sliding surface 7.8...Slider 9...Elastic plate 10...Magnetic head 11...Medium 15, 15'...Protrusion Gl...Recording/reproduction gap for

Claims (1)

[Claims] In a magnetic head device in which two magnetic heads arranged facing each other are brought into pressure contact with both the front and back surfaces of a magnetic recording medium and are slid relative to the medium to record or reproduce information,
A magnetic head device characterized in that a protrusion for pressing the medium against the gap portion is provided on each medium sliding surface of the two heads at a position facing the magnetic gap portion of the magnetic core of each head. .