JPH0457250A - Magnetic head - Google Patents

Abstract

PURPOSE:To suppress a spacing quantity low by providing a roller on the magnetic recording medium sliding part of a magnetic head so as to be smoothly slid between the magnetic head and a medium in contact with the medium rotatably. CONSTITUTION:In the case of recording or reproducing, when the medium to be rotated to medium sliding faces S1 and S2 of a main body 10 the magnetic head is slid in a direction (a), a roller 14 is rotated in contact with the medium and by the rotation, the medium and the medium sliding faces S1 and S2 are slid more smoothly than conventional. Therefore, the warp of the medium is hardly generated, and undulation or vibration caused by the warp is reduced. Then, the spacing quantity is hardly fluctuated and suppressed low, and the characteristic of the magnetic head is stablized and improved. Further, since the spacing quantity is suppressed low in such a manner, it is not necessary to strengthen the pressure for pressing the magnetic head to the medium, and the durability of the medium can be improved.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic head that magnetically records or reproduces information by slidingly contacting a magnetic recording medium, and is particularly applicable to a flexible disk-shaped rotating magnetic recording medium. The present invention relates to a magnetic head that performs recording and reproduction on a magnetic head.

[Prior Art] As this type of magnetic head, there is a magnetic head used in an FDD (floppy disk drive device) that records or reproduces information on a magnetic disk, which is a flexible rotating magnetic recording medium called a floppy disk. , FDDs are rapidly becoming smaller and larger in capacity, and accordingly, magnetic heads for FDDs are required to have higher recording densities. An effective method is to shorten the wavelength of the signal recorded on the medium (hereinafter referred to as ``medium'').However, playback output loss caused by the gap between the medium and the magnetic head (hereinafter referred to as ``spacing'') , so-called spacing loss increases as the recording wavelength becomes shorter, and a small change in the amount of spacing greatly affects the reproduction characteristics of the magnetic head.Therefore, it is necessary to stabilize the contact state between the magnetic head and the medium and reduce the amount of spacing. (This is an important point in achieving high recording density. With this in mind, conventional FDD #i magnetic heads employ structures as shown in FIGS. 5 to 7.

The magnetic head body 1o is constructed by assembling the components shown in FIG. 5 as shown in FIG. 6, and the magnetic head is constructed by fixing the magnetic head upper body 10 to the elastic plate 8 as shown in FIG. . Each component of the magnetic head and its assembly will be explained below.

First, the reference numeral 1 is a recording/reproducing core (magnetic core for recording/reproducing), and a recording/reproducing gap (magnetic gap for recording/reproducing) 2 is formed on the upper surface in the figure where it slides on a medium (not shown).
is provided. Sliders 6.7 are joined to both sides of the recording/reproducing core 1 along the longitudinal direction.

The slider 6.7 is a member that holds (pinches) the recording/reproducing core 1, comes into sliding contact with the medium together with the recording/reproducing core 1, and stabilizes the sliding movement between the recording/reproducing core 1 and the medium. Slider 6.
7 has a block shape with a substantially L-shaped cross section, and a groove 7a is provided in the upper surface of one slider 7 in the portion closer to the core l side.
is formed along the medium sliding direction. Slider 6.
7 is joined to the recording/reproducing core l, the top surface of the slider 6 and core l, and the portion on the near side in the figure of the groove 7a on the top surface of the slider 7 constitute a first medium sliding surface S1, and the groove on the top surface of the slider 7 The portion farther back than 7a becomes the second medium sliding surface S2.

After the slider 6.7 is joined to the recording/reproducing core l, a coil pobbin 5° around which the coil 5 is wound is fitted to the recording/reproducing core l, thereby constructing the magnetic head main body lO of FIG.

Then, as shown in FIG.
The back core 3 is fixed to the lower end of the recording/reproducing core l protruding below the elastic plate 8, and a magnetic circuit of the magnetic core is constructed. Further, a flexible printed circuit board 9 for leading to the outside is coupled to the elastic plate 8, and the terminal of the coil 5 is connected to this circuit board 9 to form a magnetic head.

The magnetic heads constructed in this way perform recording and reproduction within an FDD by sandwiching a medium (floppy disk) 11 between them, as shown in FIG.

In FIG. 8, reference numeral 12 denotes a carriage that carries a magnetic head and moves along the radial direction of the medium 11 (horizontal direction in the figure) by driving by a drive means (not shown).

An arm 13 is supported on the carriage 12 so as to be elastically movable in the directions of arrows A and B by a plate spring (not shown).
It is biased in the direction of arrow B by a coil spring (not shown). The above-described magnetic heads are attached to the upper surface of the distal end of the carriage 12 and the lower surface of the distal end of the arm 13 by fixing respective elastic plates 8.8 with adhesive.

The magnetic head main body 10.10 is arranged with the medium 11 in between so that the medium sliding surfaces S1 and S2 face each other, and the magnetic head main body 10.10 is arranged so that the medium sliding surfaces S1 and S2 face each other. The media 11 are pressed against each other, and the media 11 are pressed against each other. The reason why the track position of the magnetic head main body 1O110, that is, the position of the recording/reproducing core l, is shifted in this way is to prevent mutual interference between the cores.

With this structure, during recording and reproduction, the medium 11 is rotated by the drive of a drive motor (not shown), and the medium sliding surfaces S1 . medium l in S2
l slides, and the medium 11 is inserted into each recording/reproducing gap 2.
slides to perform recording and playback. The sliding direction of the medium 11 with respect to the magnetic head is the direction of arrow a in FIG.

[Problems to be Solved by the Invention] In the conventional FDD magnetic head described above, the amount of spacing is reduced by the elastically movable support structure by the elastic plate 8 and the elastic pressing by the spring.

However, in the conventional FDD magnetic head, the medium sliding surface S
1. Both S2 are flat, and as shown in FIG.
Surface contact with 1. For this reason, while undulations and vibrations occur in the medium 11 due to the deflection of the medium 11 as the medium 11 rotates, the second recording/reproducing gap cannot follow the displacement of the surface of the medium 11, and the spacing amount fluctuates. do.

One way to always reduce the amount of spacing is to increase the pressure applied to the medium 11 on the magnetic head via a spring (not shown), but this method tends to cause scratches on the medium 11, and its durability is limited. This is not preferable because it causes significant deterioration.

Therefore, an object of the present invention is to provide a magnetic head of this type.
The purpose is to make it possible to keep the amount of spacing small with a configuration that does not cause damage to the medium.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a magnetic head that magnetically records or reproduces information by slidingly contacting a flexible disk-shaped rotating magnetic recording medium. A structure is adopted in which the magnetic recording medium sliding portion of the magnetic head is provided with a roller that rotatably contacts the medium and smoothes the sliding movement between the magnetic head and the medium.

[Function J] According to such a structure, the magnetic head and the rotating magnetic recording medium are smoothly slid by the rollers, so that deflection of the medium is less likely to occur during recording or reproduction.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to FIGS. 1 to 4. Here, FDD magnetism/sodium is taken as an example.
Portions common or corresponding to those in FIG. 8 are designated by common reference numerals, and explanations of the common portions will be omitted.

First Embodiment FIGS. 1 and 2 are an exploded perspective view and an assembled perspective view showing the structure of a main body of a magnetic head according to a first embodiment of the present invention.

As shown in both figures, this embodiment differs from the conventional example shown in FIG.
is formed, and the roller 14 is inserted into the shaft 14 in this groove 7b.
It is rotatably provided with respect to a.

7b is provided on the medium sliding surface S2 of the slider 7 on the upstream side (medium entry side) of the recording/reproducing gap 2 of the recording/reproducing core l in the medium sliding direction (direction a in FIG. 2). , are formed along the track width direction perpendicular to the medium sliding direction.

Further, the roller 14 is rotatably provided in the groove 7b with both ends of the shaft 14a fixed in the groove Tb with an adhesive 17. The shaft 14a of the roller 14 is fixed parallel to the track width direction. The roller 14 is arranged so that the upper end of its outer peripheral surface in FIG. 2 coincides with a plane extending from the medium sliding surface S2.

The structure of the magnetic head main body IO of this embodiment other than the above is the same as that of the conventional example described above, and the assembled magnetic head main body 10 is fixed to the elastic plate 8 shown in FIG. 7 in the same manner as the conventional example, and the coil 5 A magnetic head is constructed by connecting the terminal to the flexible printed circuit board 9.

According to the structure of this embodiment as described above, during recording or reproduction, the medium sliding surface S1. of the magnetic head main body IO in FIG. S
When the medium rotating with respect to 2 slides in the direction a, the roller 14 rotates in contact with the medium, and this rotation allows the medium to slide more smoothly between the medium sliding surfaces Sl and S2 than before. . As a result, deflection of the medium is less likely to occur, waviness and vibration due to deflection of the medium are reduced, and the amount of spacing is less likely to fluctuate and can be kept small, thereby stabilizing and improving the characteristics of the magnetic head. Furthermore, since the amount of spacing can be kept small in this way, it is not necessary to increase the pressing force with which the magnetic head is pressed against the medium, and the durability of the medium can be improved.

Note that in the above structure, the roller 14 may be provided on the downstream side of the recording/reproducing gap 2 in the medium sliding direction (on the exit side of the medium).

Second Embodiment Next, FIGS. 3 and 4 are an exploded perspective view and an assembled perspective view showing the structure of a magnetic head main body according to a second embodiment of the present invention.

In this embodiment, in order to cope with higher density recording, the recording/reproducing core 1 is a two-piece core that butts together without using a back core, and the dimensions are quite small (to shorten the magnetic path). A window 1a for coil winding is formed in the recording/reproducing core 1, and the coil 5 is directly wound around the recording/reproducing core 1 through this window 1a.

On the other hand, the slider 4 is made by integrating the sliders 6 and 7 of the first embodiment to form first and second medium sliding surfaces S1 and S2 with a groove 4a corresponding to the groove 7a of the slider 7 in between. ,
Furthermore, the medium sliding surface S1 side where the recording/reproducing core 1 is provided is formed in a shape in which a half portion up to the recording/reproducing gap 2 portion is cut out as a notch portion 4c toward the medium sliding direction a. Furthermore, a groove 4b is formed in the slider 4 at the corner of the medium sliding surface S1 and the side surface of the notch 4c, and the recording/reproducing core 1 has a portion around which the coil 5 is wound around the groove 4b. The opposite parts are fitted and fixed and held by the slider 4.

In this embodiment, a roller holder 15 rotatably supporting the roller 14 is fixed to the notch 4c of the slider 4. The roller 14 is mounted in the holder I5 by a U-shaped bearing 16, and both ends of the shaft 14a of the roller 14 are connected to grooves 15a and 16a formed in the holder 15 and the bearing 16.
By being sandwiched between them, they are rotatably supported. The outer peripheral surface of the roller 14 is exposed through an opening 15b formed in the holder 15. The holder 15 supporting the roller I4 in this manner is fixed within the notch 4c by fitting the convex portion 15c into the hole 4d formed on the side surface of the notch 4c.

In this way, the roller 14 is supported within the notch 4C and is rotatably provided near the upstream side of the recording/reproducing core I in the medium sliding direction (direction a). As in the first embodiment, the shaft 14a of the roller 14 is parallel to the track width direction, and the upper end of the outer peripheral surface of the roller 14 in FIG.
1. The openings I4 are arranged so as to coincide with the plane extending from S2.

According to the structure of this embodiment as described above, the roller 14 rotates in contact with the medium sliding against the head, as in the case of the first embodiment, and the rotation causes the medium and the medium sliding surface S1,
The sliding movement with S2 becomes smoother, the deflection of the medium is less likely to occur, and the same effect can be obtained. Moreover, in this embodiment, by making the recording/reproducing core 1 smaller and shortening the magnetic path, it is possible to cope with higher density recording.

Note that in this embodiment as well, the roller 14 may be provided on the downstream side of the recording/reproducing core l in the medium sliding direction, or may be provided on the medium sliding surface S2 side. Since the spacing generation condition differs depending on the shapes of the elastic plate 8, carriage 12, arm 13, etc., as described above, the arrangement of the rollers 14 may be appropriately selected according to this.

[Effects of the Invention] As is clear from the above description, according to the present invention, in a magnetic head that magnetically records or reproduces information by slidingly contacting a flexible disk-shaped rotating magnetic recording medium, the magnetic head A structure is adopted in which the magnetic recording medium sliding part is provided with a roller that rotatably contacts the medium and smoothes the sliding and movement of the magnetic head and the medium. Since the medium slides smoothly, the medium is less likely to bend during recording or playback, and the amount of spacing can be kept small.

The characteristics of the magnetic head can be improved. Further, it is not necessary to increase the pressing force for pressing the magnetic head against the medium, and the excellent effect of improving the durability of the medium can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the structure of a magneto-magnetic head body for FDD according to a first embodiment of the present invention, FIG. 2 is a perspective view of the assembled magnetic head body, and FIG. 3 is a second embodiment of the present invention. Fig. 4 is an exploded perspective view of the magnetic head main body according to the same technology, Fig. 5 is a perspective view of the assembled state of the magnetic head main body, and Fig. 5 is a conventional FD.
FIG. 6 is an exploded perspective view showing the structure of the D magneto-electromagnetic head body, FIG. 6 is a perspective view of the assembled magnetic head body, FIG. 7 is an overall perspective view of the magnetic head, and FIG. 8 is the magnetic head. FIG. ■...-Recording/reproducing core 2---Recording/reproducing gap 4
．． 6.7--Slider 5--Coil 8--Elastic plate 9--Flexible printed circuit board 10--Magnetic head body 11--Medium 14--Roller 15--
・Roller holder 16... - Bearing patent applicant Canon Electronics Co., Ltd. Agent Patent attorney Takashi Kato r A-z ト':c#/1Nli7Figure 4

Claims (1)

[Claims] 1) In a magnetic head that magnetically records or reproduces information by slidingly contacting a flexible disk-shaped rotating magnetic recording medium, a magnetic recording medium sliding portion of the magnetic head is rotatably contacted with the medium. 1. A magnetic head characterized in that a roller is provided for smooth sliding between the magnetic head and the medium.