JPH01116954A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the generation of a spacing by providing the means energizing a magnetic head approximately in a reverse direction to the rocking direction that the magnetic head is energized by the sliding with a medium. CONSTITUTION:A 1st magnetic head 1 for performing recording or reproducing is supported and fixed to the upper face of the tip of a carriage 9. A 2nd magnetic head 2 for performing recording or reproducing is supported on the lower face of the tip of an arm 8 by the elastic gimbal plate 3 whose peripheral edge part is fixed to the arm 8. A leaf spring 12 is provided by fixing it on the lower face of the arm 8 for supporting a magnetic head 2, pressing the gimbal plate 3 elastically in the lower direction of a figure and energizing the magnetic head 2 in the same direction. Namely the leaf spring 12 energizes the magnetic head 2 in a direction E, the magnetic head 2 receives rocking force D by its sliding with a medium 6, energizing approximately in the reverse direction to the G direction intending to rocking and constraining the rocking in the G direction of the head 2. The generation of spacing can thus be prevented.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device for magnetically recording or reproducing information on a magnetic recording medium, and in particular, the present invention relates to a magnetic recording/reproducing device for magnetically recording or reproducing information on a magnetic recording medium. The present invention relates to a magnetic recording/reproducing device that magnetically records or reproduces information by bringing the device into contact with the magnetic recording device.

[Prior Art] As a magnetic recording/reproducing device of this type, a flexible disk device (hereinafter referred to as FDD) is used as an external storage device of a computer and performs magnetic recording or reproduction of information on a flexible magnetic disk of a magnetic recording medium. In recent years, FDDs have been rapidly becoming smaller and larger in capacity, and accordingly higher recording density is required.
An advantageous method for this purpose is to narrow the gap width of the magnetic gap of the magnetic head. However, when the gap width is narrowed, a change in the size of the gap (hereinafter referred to as spacing) between the magnetic recording medium (hereinafter abbreviated as medium) and the magnetic head appears as a large change in the output of the magnetic head. For this reason, the state of contact between the magnetic head and the medium is important, and it is necessary to stably keep the spacing small.

Against this background, in conventional FDDs, a structure as shown in FIG. 5 is adopted as the structure of the magnetic head support section.

In FIG. 5, reference numeral 9 denotes a carriage for transporting the magnetic head, which is driven along the radial direction of the medium 6 (direction perpendicular to the plane of the drawing) by a driving means (not shown).

A first magnetic head 1 for recording or reproducing information on the lower surface of the medium 6 is supported and fixed on the upper surface of the leading end of the carriage 9 via a support plate 4.

An arm 8 is cantilevered on the carriage 9 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 pressing spring 7.

A second magnetic head 2 for recording or reproducing information on the upper surface of the medium 6 is supported on the lower surface of the tip of the arm 8 by an elastic gimbal plate 3 whose peripheral portion is fixed to the arm 8. The magnetic head 2 is disposed facing the magnetic head 1, and its upward position in the figure is regulated by a pivot 5 provided on an arm 8. The magnetic head 2 swings about the pivot 5 as a fulcrum through the elasticity of the gimbal plate 3. possible.

Note that reference numerals 10 and 11 indicate shield members for shielding the magnetic head 1.2 from external noise, respectively.

With this structure, during recording and reproduction, the suppression spring 7 presses the arm 8 downward in the figure, and this pressing force causes the magnetic head 1.2 to press against the medium 6, and while holding it, the medium 6 is rotationally driven in the direction of arrow A in the figure by a drive means (not shown), and the magnetic heads 1 and 2 come into sliding contact with the medium 6 to perform recording or reproduction.

In such a conventional structure, the magnetic head 1.2 is brought into pressure contact with the medium 6 by the pressing force of the suppression spring 7, and the magnetic head 2 is supported swingably so that it follows the medium 6. It keeps the pacing down.

[Problems to be Solved by the Invention] In the conventional structure as described above, as shown in FIG. 6(A), the pressing force B of the suppression spring 7 is transmitted to the magnetic head 2 via the pivot 5, and A distributed pressure C is transmitted to the sliding surface.

On the other hand, since the medium 6 moves in the direction of arrow A and slides on the magnetic head 2, the sliding resistance causes a rocking force to act on the magnetic head 2 with the rocking center at the point of contact with the pivot 5. . This rocking force appears in the sliding portion as a force indicated by an arrow. Normally, by applying a pressing force B sufficient to suppress this force, the magnetic head 2 and the medium 6 are brought into close contact.

However, when the sliding resistance between the magnetic head 2 and the medium 6 increases, the force becomes larger than the distributed pressure C, as shown in FIG. 6(B). The magnetic head 2, whose displacement downward from the sliding contact surface with the medium 6 is regulated by the magnetic head l on the lower surface side, has a sliding contact F at the left end in the figure on the side where the medium 6 enters the magnetic head 2. The center swings in the direction of arrow G as shown by the broken line.

This movement creates a spacing between the magnetic head 2 and the medium 6 on the side where the medium 6 exits.
There was a problem in that the recording and reproducing characteristics of the fruiting device were significantly deteriorated.

There is also a method of increasing the pressing force B to suppress the occurrence of spacing as described above, but in that case, the pressure on the sliding contact portion on the entrance side of the medium 6 to the magnetic head 2 is abnormal. This may result in damage to the medium 6.

[Means for Solving the Problems] In order to solve these problems, according to the present invention, a swingably supported magnetic head is brought into sliding contact with a magnetic recording medium to magnetically record or reproduce information. In a magnetic recording/reproducing apparatus for performing the above, a structure is adopted in which means is provided for urging the magnetic head in a direction substantially opposite to the swinging direction in which the magnetic head is urged by sliding contact with the medium.

[Function] According to such a structure, the magnetic head is prevented from swinging due to the biasing force of the above-mentioned biasing means due to sliding contact with the medium, and the occurrence of spacing can be suppressed. .

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to FIGS. 1 to 4.

Note that the above-mentioned FDD is used as an example here, and the first
In FIGS. 4 to 4, parts common to those in FIGS. 5 and 6 of the conventional example are designated by the same reference numerals, and their explanations will be omitted.

Figure 1 shows the structure of the magnetic head support section of an FDD according to the first embodiment of the present invention.As shown in the figure, this embodiment has the same structure as the conventional example described above. In addition, a leaf spring indicated by reference numeral 12 is fixedly provided on the lower surface of the arm 8 for supporting the magnetic head 2.

In this case, the leaf spring 12 as a whole is bent into a substantially U-shape, and its tip portion is formed into a substantially semicircular arc shape. The base end side of the leaf spring 12 is fixed to the lower surface of the arm 8, and the tip end of the leaf spring 12 is placed near the magnetic head 2 on the upper surface of the gimbal plate 3 supporting the magnetic head 2. It is arranged so as to be in contact with the region on the downstream side in the A direction of the sliding direction.

The leaf spring 12 elastically presses the gimbal plate 3 downward in the figure and urges the magnetic rod 2 in the same direction. That is, the leaf spring 12 biases the magnetic head 2 in the E direction as shown in FIG. The magnetic head 2 is urged in a direction substantially opposite to the above direction. Therefore, the biasing of the magnetic head 2 in the G direction due to sliding contact with the medium 6 is offset by the biasing of the leaf spring 12 in the E direction, making it possible to suppress the swinging in the G direction. It is possible to suppress the occurrence of pacing.

As described above, according to this embodiment, the occurrence of spacing can be suppressed, the output characteristics of the magnetic head can be improved and stabilized, and efficient and stable magnetic recording and reproduction can be performed. In addition, since it is not necessary to increase the pressing force B of the pressing spring 7 in order to suppress the occurrence of spacing, the medium 6
damage can be prevented.

Note that in the structure of the present embodiment described above, other elastic members may be used in place of the leaf spring 12 to provide the same biasing force.

FIG. 3 shows the structure of a magnetic head support portion of an FDD according to a second embodiment of the present invention.

As shown in FIG. 3, in the case of this embodiment, a leaf spring 12 that provides the same bias as the leaf spring 12 of the first embodiment is attached to the lower surface of the arm 8 together with a spring 13 by a screw 14. The leaf spring 12 is held by pressing the base end of the leaf spring 12 against the head of the screw 14. With this structure, the supporting position of the plate spring 12 can be adjusted in the vertical direction in the figure by adjusting the tightening of the screw 14, and the urging force of the plate spring 12 on the magnetic head 2 can be adjusted.

According to the structure of this embodiment, the same effect as in the first embodiment can be obtained by biasing the leaf spring 12, and by adjusting the biasing force, the magnetic herad 2, which differs depending on the individual FDD, can be obtained. It can cope with the urging force in the direction G in FIG. 2, and the output characteristics of the FDD can be made uniform.

Note that the structure for adjusting the support position of the leaf spring 12 is not limited to this, and can also be realized using, for example, a piezoelectric element that expands and contracts in response to changes in applied voltage.

FIG. 4 shows the structure of a magnetic head support portion of an FDD according to a third embodiment of the present invention.

As shown in the figure, in this embodiment, a plate spring 12 for applying bias to suppress spacing is constructed integrally with a shield member 10 for shielding noise from the magnetic head 2.

According to this structure, the conventional arm 8 in FDD
The above-mentioned biasing can be easily performed by simply replacing the shield member IO without changing the structure of the shield member IO. Further, the above-mentioned integration can reduce the number of parts of the device and the number of assembly steps, leading to cost reduction.

[Effects of the Invention] As is clear from the above description, the present invention provides a magnetic recording and reproducing apparatus that magnetically records or reproduces information by bringing a swingably supported magnetic head into sliding contact with a magnetic recording medium. , a structure is adopted in which means is provided for urging the magnetic head in a direction substantially opposite to the direction of the swinging force applied by the magnetic head through sliding contact with the medium, so that the magnetic head is biased by the urging of the urging means. It is possible to extremely effectively suppress the occurrence of spacing between the media and the media, improving and stabilizing the output characteristics of the device, and achieving the excellent effect that recording and playback can be performed efficiently, favorably, and stably. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of the magnetic head support part of an FDD according to an embodiment of the present invention, and FIG. 2 shows the rocking force acting on the magnetic head 2 in FIG. 3 is a longitudinal sectional view of the magnetic head support portion of the FDD according to the second embodiment of the present invention, and FIG. 4 is a diagram illustrating the action of the urging force.
FIG. 5 is a vertical cross-sectional view of a magnetic head support portion according to an embodiment, and FIG. 6 is a vertical cross-sectional view of a magnetic head support portion of a conventional FDD.
A) and (B) are explanatory diagrams of the rocking force acting on the magnetic head 2 in FIG. 5, respectively.

Claims (1)

[Claims] In a magnetic recording/reproducing device that performs magnetic recording or reproduction of information by bringing a swingably supported magnetic head into sliding contact with a magnetic recording medium, the swinging direction in which the magnetic head is urged by sliding contact with the medium; A magnetic recording/reproducing device characterized by being provided with means for biasing a magnetic head in substantially the opposite direction.