JPS59112463A - Magnetic head - Google Patents

Abstract

PURPOSE:To suppress a position variation of a recording medium without working steadily an excessive pressing force by providing the second pressing energizing member which works only in case when the position variation of the recording medium exceeds a prescribed value, in addition to the first enegizing member for giving a pressing force to the recording medium. CONSTITUTION:A titled magnetic head is provided with the second load springs 18, 19 which work only in case when a position variation of a floppy disk 8 exceeds a prescribed value, and for instance, it shows the same movement as a conventional magnetic head while the position variation of the floppy disk 8 is smaller than a limit value of a gap (g), but when the variation exceeds the limit value of the gap (g), the magnetic head also moves following it, a hook 14 or 14' contacts by pressing with the second load spring 18 or 19, and its pressing force is added to a pressing force of a supporting spring 4 or 5. In this way, the further position variation of the floppy disk 8 is suppressed, and a stable contact of the magnetic head and the floppy disk 8 is kept.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic head for a magnetic recording device using a flexible recording medium.

[Prior art]

FIG. 1 shows the structure of a magnetic head conventionally used in a double-sided 70-bit disk device. This magnetic head is pushed onto the carriage 1.

The swing arm 2, which is attached to the springs 9 and 10 together with the leaf springs 9' and 10' at 11.12,
3. It is composed of head support springs 4 and 5 attached to the swing arms 2 and 3, respectively, and a twin-body slider 6.7 that incorporates an electromagnetic conversion element attached to the head support springs and 5.

The swing arms 2 and 3 are located on both sides of the floppy disk 8, and during operation, the swing arms 2 and 3 are located on the reference plane 21 of the carriage.
．． 22, and is used in a state where it is pressed by presser springs 9 and 1o. In this state, 1 [) the twin body slider 6
．． Head support spring hands 7 are operated by being pressed from both sides to sandwich the floppy disk 8.

Figure 2 is a perspective view showing details of the upper head support spring;
FIG. 2(B) is a side view of the same. In addition, the bottom side.

The head support spring 5 also has a similar structure. .

Upper head support spring (hereinafter simply referred to as "support spring").

) 4 is a gimbal portion 13 . A load arm 15 having a load force and attached to the load arm 15.

The double-bodied slider 6 is pressed against the floppy disk 8 by the attached hook 14 via the p-dove pull 16.

The problem with this magnetic head is the positional fluctuation of the 70-tube disk 8. Since the 70-tube disk 8 is a flexible medium, waviness deformation of 300 to 500 μm can generally occur. -, the cylinder slider 6.7 becomes difficult to follow, and this causes disturbance in the recording/reproducing waveform. In other words, as shown in Figure 3 (A),
When the 7p double disk 8 is operating at the reference position (indicated by a dashed line 17) without any positional change, the pressing force F applied from the support spring to the load dimple 16 is The data is added equally from the left and right sliders to the floppy disk 8 using Fl-F. However, as shown in FIG. 3(B).

When the 70-tube disk 8 moves by 8 from the reference position, the twin-body slider 6 shifts in the height direction, so the pressing force applied to the floppy disk 8 by the left and right sliders becomes F+) Fs, resulting in an uneven force of 1.

FIG. 4 shows an example of the relationship between the amount of positional variation δ of the floppy disk 8 and the pressing force of the left and right sliders of the twin-body slider 6. In this example, a component force of 5 gf or more (the shaded area in the figure) is an allowable range. When pressing the slider on either side, if the force falls outside the above-mentioned allowable range and becomes small, a problem will occur in which the recording and reproducing waveforms will be disturbed. In the above example, if the positional fluctuation of the floppy disk 8 exceeds O03, disturbances occur in the recording/reproducing waveform. H
1. As a solution to the above-mentioned problem,

α) Head pressing is a method of increasing force to suppress positional fluctuations of the recording medium within a specified value.

? ) A method of making the recording medium follow the head by restricting the degree of freedom of the head (for example, by fixing a twin-body slider on one side).

etc. have been proposed. However, in these methods, constant excessive pressure on the recording medium causes force to act on it, so
A drawback is that contact wear shortens the life of the recording medium. 2゜[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to eliminate the above-mentioned drawbacks of conventional magnetic heads, and to eliminate constant and excessive pressure on the recording medium. The object of the present invention is to provide a magnetic head that can suppress positional fluctuations of a recording medium without applying force and prevent characteristic deterioration due to changes in the relative position between the magnetic head and the recording medium.

[Summary of the invention]

The gist of the invention is for use in magnetic recording devices that use flexible recording media. pressed against the recording medium, and
In the magnetic head having a support structure that has a degree of freedom in no direction with respect to positional fluctuations of the recording medium, in addition to the first biasing member that applies force, the pressing against the recording medium is caused by positional fluctuations of the recording medium. The second magnetic head pressing, which is activated only when the constant value 5 is exceeded, is provided with a biasing member.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings. 2. FIG. 5 shows a magnetic head which is an embodiment of the present invention.

FIG. 3 is a side view showing main parts. The magnetic head shown in this embodiment is compatible with the conventional double-sided floppy disk M shown in FIG.
A second load spring 1 acts on the LT magnetic head only when the positional fluctuation of the floppy disk exceeds a predetermined value.
8.19 is installed. Note that numerals 2 to 8 indicate the same constituent elements as shown in Figure 1 of the rod, and 14 and 14' are the same hooks as shown in Figure 2 (A) and 2).

The second load springs 18 and 19 are arranged so that the second load springs 18 and 19 contact the hooks 14 and 14' and exert a biasing force only when the floppy disk 8 moves by a predetermined value g from the reference position. They are attached to the swing arm 2.3 with a gap of g from the reference position of 14'. The above-mentioned gap value g is, for example, based on the limit value Q of 3 m shown in FIG.

A small 0.25 seagull is used. Also, a second load.

The rigidity of the springs 18 and 19 is, for example, 5 gf/w+. .

The magnetic head of this embodiment is constructed as described above.

The positional fluctuation of the floppy disk 8 is smaller than the above g.

The gap exhibits the same behavior as a conventional magnetic head. .

However, when the positional fluctuation of the floppy disk 8 exceeds the above g, the magnetic head also moves accordingly and the hook 1 is moved.
4 (or 14') contacts the second load spring 18 (or 19), and the second load spring 18 (or 19)
The pressing of the support spring 4 (or 5) adds to the force. .

As a result, further positional fluctuations of the floppy disk 8 are suppressed, and the double body slider 6 (or 7).

Since this prevents the zero pressing force applied to the floppy disk 8 from decreasing, stable contact between the magnetic head and the floppy disk 8 is maintained. .

The material, shape, etc. of the second load springs 18 and 19 can be arbitrarily selected. Also, its rigidity.

and the value g of the rl*1 gap can be freely determined within an allowable range.

〔Effect of the invention〕

As described above, according to the present invention, in the magnetic head of a magnetic recording device using a flexible recording medium, the pressing force against the recording medium is A biasing member is provided to press the second magnetic head, which acts only when the positional fluctuation exceeds a certain value. Therefore, if the pressure is constantly excessively applied to the recording medium, the position of the recording medium can be changed without applying any force. This has a remarkable practical effect in that it is possible to realize a magnetic bowl and a head that can suppress fluctuations and prevent characteristic deterioration due to changes in the relative position between the magnetic head and the recording medium.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing a conventional magnetic head, Figs. 2 (A) and (B) are perspective and side views showing details of the support spring, and Figs. 3 (8) and 3) are A diagram explaining the relationship between the change in force between the positional fluctuation of the floppy disk and the pressing of the twin slider, and Figure 4 is a graph illustrating the quantitative relationship.
FIG. 5 is a side view of one embodiment of the present invention. 1: Career, 2.3! swing arm, 4. . 5; Hook, 6, 7 + twin body slider, 8: Flora. B disk, 13. 13'i gimbal section, 14. . 14': Hook, 1f1.16'i road dimple,
1 (118, 1Qj second load spring. Patent applicant: Hitachi, Ltd. No. 1 Fig. 0 Fig. 2 ■ Fig. 2 [available])

Claims (1)

[Claims] Used in magnetic recording devices that use flexible recording media,
In a magnetic head having a support structure that is pressed against the recording medium and has a degree of freedom in no direction with respect to positional fluctuations of the recording medium, the pressing against the recording medium is performed by a first biasing member that applies a force, and the like. The magnetic head is characterized in that the second magnetic head press is provided with a biasing member that acts only when the positional fluctuation of the recording medium exceeds a certain value.