JPS6246473A - Magnetic head supporting device - Google Patents

Abstract

PURPOSE:To make good following up of a head possible despite simple structure by providing upper and lower arms to which a magnetic head is attached to allow oscillation around a rotation shaft on the extension of a media face. CONSTITUTION:Upper and lower arms 5 to which a magnetic head 3 is attached are mounted on a supporting stand 8 by a supporting spring 6a having chevronlike side form and a set-screw 7. The rotation shaft of the supporting stand 8 is provided on the extension of a media face and pressure is given by an auxiliary spring 10 in the direction of closing. Accordingly, even when the magnetic head 3 moves vertically following displacement of the media 1, relative position of the head 3 in radial direction of the media does not deviate theoretically. Thus, the head can be made to follow up movement of the media nicely despite simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support structure for a magnetic head in a double-sided floppy disk drive.

[Summary of the invention]' By setting the rotation axis of the arm supporting the upper and lower magnetic heads within the extended plane of the magnetic media surface during operation of the floppy disk drive device, fluctuations in the media surface can be prevented. The trackability of the magnetic head surface has been improved, and the off-track tendency has been theoretically eliminated.

[Conventional technology]

In order to record and reproduce information on a flexible double-sided magnetic disk, a magnetic head is pressed against both sides of the disk, and the following technique is known for clamping the disk.

■The upper and lower heads are each supported by gimbal springs, and the media (
(floppy disk) so that it adapts well to the vibrations that occur during rotation. (Japanese Patent Publication No. 58-43826) (1) Fix the lower head to the carriage arm, support and pressurize the soil head with a Zinopal spring, and force the media surface and the upper head to follow the lower head surface.

(Special Publication No. 58-15866) [Problems to be Solved by the Invention] Conventional example (■) has the advantage that each head fits smoothly on the media surface. radial direction [carriage advance/retreat direction]
, the other direction is normally taken in the tangential direction) are parallel to and apart from the media surface, so when the head tilts to follow the displacement of the media surface, the contact position between the head and the imaginary stationary media surface changes. . In particular, when the media is tilted in the radial direction, there is a tendency for the head to deviate from the recording track, so-called track misalignment.

In the conventional example (■), there is almost no tendency for track deviation because the other parts conform to the head surface under the national standard, but this has the drawback that it interferes with the free movement of the media, so depending on the state of friction with the media surface, it may affect the lifespan of the media. There is.

The present invention solves the above-mentioned drawbacks, adapts well to the displacement of the media surface, and is less likely to cause track misalignment. 18
ga, □□,. A6゜: [Means for solving the problem] In the present invention, each of the upper and lower heads is fixed to an arm, respectively, or made relatively rigid (particularly - throat medallion) □A Increased rigidity against inclination in the radial direction ) At the same time, each of the upper and lower arms is supported by a leaf spring □ so that each of the upper and lower arms has a rotation axis within the extended plane of the media surface.

[Effect]

Since each arm has a rotation axis on the extended surface of the media surface, the relative position of the head □ in the media radial direction will not shift in principle even if the head moves up and down following the displacement of the media.

[Embodiment 1] FIG. 1 is a sectional view of a main part of a magnetic head support structure showing a first embodiment of the present invention. 1 is a media, 2 is a plastic cartridge that stores the media 1, 3 is a magnetic head for reading/writing with the same top and bottom shape, 4 is a stand for the magnetic head, 5 is an arm that supports the head 3, and 6a is a chevron-shaped 7 is a set screw for connecting the support spring 6a to other members; 8 is a support stand for the arm 5; 9 is a stopper for the support stand 8; 1o is a head for closing both arms 5; Reference numeral 3 indicates an auxiliary spring that applies preload to the medium 1 in the operating state, and reference numeral 11 indicates a carriage that moves the magnetic head 3 in the radial direction of the medium.

FIG. 2 shows that in this embodiment, the support base 8 of the upper and lower arms is connected to the auxiliary spring 10 in order to insert the cartridge 2 containing the media 1.
FIG. 3 is a cross-sectional view of a main part showing a state in which the arm 5 is opened and separated from the stopper 9 against the closing force of the arm 5 (the opening/closing mechanism of the arm 5 is not shown). FIGS. 3 and 4 are perspective views showing two types of support springs 6a and 6b, each having a chevron shape, used in this embodiment.

The support spring 6a16b is shaped so that the intersection line of the extended surfaces of the respective slopes is substantially an extension of the plane of the media 1 (ignoring the thickness). It is known that the easiest deformation of such a chevron spring is that when both legs of the chevron are fixed, an object fixed to the top of the chevron will swing around the intersection line. , it will be clear that the effects described in the previous section occur. However, since this shape has considerably high rigidity, the angle spring may be constructed from a considerably thin plate. Furthermore, if the slope element of the angle spring is made thin as shown in Figure 4, the rigidity of rotation (torsion) around other axes perpendicular to the rotational axis will be lower than that of a spring with a wide slope part as shown in Figure 3. This can be done by carefully considering the compatibility with the media 1 and determining the shape.

Embodiment 2] FIG. 5 is a sectional view of a main part of a magnetic head support structure showing a second embodiment of the present invention. The main feature of this embodiment is that the support spring 6c is not a chevron-shaped but a flat leaf spring as shown in FIG. The support spring □6C has three branches, and the right end connecting portion is fixed to the carriage 11. The tips on both sides of the branch are fixed to one of the upper and lower arms 5, and the tips on the inner side of the branch are fixed to the other side with set screws 7. The plate surface of the main support spring 6c is the plane of the media 1.
It is positioned so that it almost coincides with the extension surface of □.

The axis of rotation of each arm 5 passes approximately through the center of the spring-action part of the branch to which it is attached, and lies in the plane of the spring perpendicular to the direction of the branch, thus meeting the requirements for the action described above. I will be H4L. The auxiliary spring 10 is different in form from the tith embodiment, but the auxiliary spring 5 also provides a preload. Note that the stopper 9 is omitted.

In each of the embodiments described above, the magnetic head 3 and the stand 4 are fixed to the arm 5. However, when the media 1 is tilted in the tangential direction, each head surface must follow closely. That is, it is necessary that the magnetic head 3 be able to rotate to some extent around the forward and backward axis (in the left-right direction in the figure) due to the displacement of the carriage 11, including in order to absorb assembly errors. This includes chevron-shaped or flat support springs 6a, 6b around the axis,
This can be achieved by the springiness of 6C. However, if the springiness is insufficient, the magnetic head 6 or the stand 4 may be
It may be attached to the arm 5 via the uniaxial Zinopal spring 12 shown in the figure (the axis of rotation is in the forward and backward direction of the head).

〔Effect of the invention〕

Although the magnetic head support device of the present invention has a simple W shape, the magnetic head follows the movement of the medium well, and the track deviation is extremely small.

[Brief explanation of the drawing]

1 and 2 are sectional views of essential parts showing a first embodiment of the present invention, FIGS. 3 and 4 are perspective views of a support spring used in the first embodiment, and FIG. FIG. 6 is a plan view of a support spring used in the second embodiment, and FIG. 7 is a plan view of a gimbal spring used in conjunction with the present invention. 1... Media, 6... Magnetic head,
5...Arm, 6a, 6b, 6C...Support spring, 1-...
,,゛・ Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (3)

[Claims] (1) In a double-sided floppy disk drive device,
Each of the upper arm and the lower arm, which carry the upper and lower magnetic heads, is supported by a support spring so as to be swingable around a rotation axis that is substantially within an extended plane of the magnetic media surface, and is supported by a support spring so as to be able to swing toward the media. A magnetic head support device is characterized in that it performs read/write operations while being pressed into contact with the magnetic head. (2) The magnetic head support device according to claim 1, wherein the support springs are angle-shaped springs, and a line of intersection of the slope portions of each angle-shaped spring substantially coincides with an extended surface of the magnetic medium. (3) The magnetic head support device according to claim 1, wherein the support springs are flat springs, and a plate surface of each flat spring substantially coincides with an extended surface of the magnetic medium.