JPS626457A - Head device - Google Patents

Abstract

PURPOSE:To reduce the shear of a track position and to prevent a recording medium from abrasion and damage by setting up the freedom of rotation in one of elements to an almost equal value in both directions, and in the other element, setting up the freedom of track width direction to almost a half of the freedom of the sliding direction. CONSTITUTION:Like an ordinary magnetic head, an upper magnetic head is pivotally supported with almost similar freedom in both the track width direction and sliding direction. A lower magnetic head 4B is fitted to an arm part through an elastic plate 18 and opposed U-shaped long holes 18a, 18b are punched into the elastic plate 18 with different directions of 90 deg.. A frame part 18c is formed on the inside of the long hole 18a and coupled with the peripheral edge by a blidge part 18f and a fitting part 18e for fitting the magnetic head 4B is formed on the inside of the long hole 18b and coupled with the frame part 18c by a bridge part 18d. The length of the bridge part 18d is equal to that of the bridge part 18f, but the width of the bridge part 18f is twice the bridge part 18d.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a head device, and more specifically, the present invention relates to a head device, and more specifically, a disk-shaped recording medium is held between two head elements, and information is recorded and reproduced by sliding. The present invention relates to a head device in which an element is elastically supported to be rotatable with a predetermined degree of freedom in the recording track width direction and the sliding direction.

[Summary of the Disclosure] This specification and drawings describe a head device of the type described above,
Regarding the degree of freedom of rotation of the two head elements in the track width direction and the sliding direction, one of the elements is made almost equal in both directions, and the other head element has the degree of freedom in the track width direction equal to the freedom in the sliding direction. The present invention discloses a technology that uses an extremely simple and inexpensive structure in which the magnetic field is approximately less than 100 mm in diameter, thereby reducing the deviation in track position and preventing abrasion and damage to the recording medium.

[Prior Art] As a head device of the type described in the industrial application field, for example, a head device is used for recording information on a magnetic disk, which is a magnetic recording medium.
Magnetic head devices that perform reproduction are widely used, and their conventional structures are as shown in FIGS. 2 to 4.

In FIG. 2, the entire magnetic head device is designated by the symbol l, and a magnetic head 4B is mounted on the upper surface of the tip of an arm portion 3B that is integrally formed on the lower side of the support case 2 that supports the entire magnetic head device.
is provided. Further, an upper arm portion 3A is supported opposite to a lower arm portion 3B via an elastic support plate 5 fixed to the upper surface of the support housing 2, and a magnetic field is attached to the lower surface of the tip of the arm portion 3A. A helad 4A is provided.

The upper arm portion 3A is rotated by the biasing force of a coil spring 7 elastically loaded between the tip of a column 6 whose rear end is fixed to the upper surface of the support portion 2 and the rear end of the arm portion 3A. 3
It is being pushed towards B. As a result, the upper magnetic head 4A is configured to be pressed toward the lower magnetic head 4B with the disk 8, which is a magnetic recording medium, in between.

With the above configuration, during recording and playback, the disk 8 is moved by an unillustrated motor around the center line indicated by the dashed line in the figure by the arrow W.
The upper and lower surfaces of the disk 8 slide against the magnetic heads 4A and 4B, respectively, thereby performing recording and reproduction.

In order for this recording and playback to be performed stably and properly,
It is necessary for the sliding surfaces of the magnetic heads 4A and 4B to follow the displacement caused by the deflection of the surface of the disk 8, and to always slide uniformly parallel to the surface.

For this reason, as shown in FIG. 3, the magnetic helad 4A is installed on an elastic plate 9 installed in the opening at the tip of the arm portion 3A that protrudes downward, and is inserted into a predetermined position via the elastic plate 9. It is rotatably supported with degrees of freedom. The other magnetic head 4B is also rotatably supported with a similar structure, except that it is different in the vertical direction.

The elastic plate 9 is called a gimbal and is formed from a thin plate of elastic metal or the like in the structure shown in FIG. In other words, the elastic plate 9 has a substantially rectangular outer shape, and inside thereof there are a pair of substantially U-shaped elongated holes 9 facing each other with a slight interval between them.
a, 9a, 9b.

9b is double punched with the outside and inside directions different by 90''. By this punching, the long holes 9a, 9a
A substantially rectangular frame portion 9C is formed inside the frame portion 9C, and a substantially rectangular mounting portion 9e is formed inside the elongated holes 9b and 9b.
In the figure, two bridge parts 9d, 9d are located approximately in the center on both the left and right sides.
The mounting portion 9e is connected to the periphery of the elastic plate 9 by two bridge portions 9f approximately at the center of the front and back sides in the figure.

It is connected to the frame portion 9C by 9f (the back side is not shown).

With this structure, the mounting portion 9e is attached to the bridge portion 9.
The bridge portion 9d has a degree of freedom limited by the elasticity, length, and thickness of d, 9d, 9f, and 9f.

It is rotatably supported around the axis X of 9d and the axis Y of bridge parts 9f and 9f, respectively.

That is, it is rotatably supported in the directions of arrows C and D in FIG. 4 with the intersection of axes x and Y (indicated by reference numeral A in FIG. 3) as the center of rotation.

In the above installation, the core part 10 of the magnetic helad 4A is inserted and fixed vertically into a hole (not shown) formed in the part 9e, as shown in FIG. This recording/reproducing core section 10 is composed of a thin plate-shaped core and a spacer, and is mounted with mask blocks 11 and 12 sandwiching both sides of the lower half of the core section 10 that protrudes below the section 9e. Installation is part 9
It is fixed to the bottom surface of e.

The mask blocks 11 and 12 support and protect the core section 10, and the lower end surfaces of the mask blocks 11 and 12 and the lower end surface of the core section 10 constitute a sliding surface 13 that is flush with the magnetic disk 8.

In addition, a winding coil 14 for electromagnetic conversion is wound around the upper half of the core portion 10 that protrudes above the portion 9e.
The winding coil 14 has its tip connected via a lead wire 16 to a flexible printed circuit board 15 fixed to one end of the mounting section 9e.

In the above configuration, the magnetic head 4A is mounted with the thickness direction of the core portion 10, that is, the recording track width direction parallel to the axis X, and the longitudinal direction, that is, the orthogonal direction parallel to the axis Y, as shown in FIG. It is attached to part 9e. Thereby, the magnetic head 4A is rotatably supported with a predetermined degree of freedom in the C direction along the track width direction and the D direction along the sliding direction. Note that the degree of freedom of rotation is set to be approximately equal in both directions C and D depending on the length and thickness of the bridge portions 9d and 9f.

Further, as shown in FIG. 3, when mounting the elastic plate 9, the rotation center A of the portion 9e is pressed at one point, which is the pressing fulcrum B of the pivot 17 of the pressing column.

With the support structure described above, the magnetic helad 4A can be rotated in the direction of arrow C in FIG. 4 even with an extremely small force. The result will be as shown in the figure. The dashed line indicated by the symbol V in FIG. 5 is a vertical line. In this way, the magnetic head 4
A is rotated even by an extremely small force, and is configured so that it can always follow the displacement of the disk 8 during recording and reproduction. As mentioned above, the other magnetic head 4B is also supported by the same structure as above, except that the vertical direction is reversed, and it is supported rotatably with almost the same degree of freedom in the track width direction and the sliding direction. There is.

[Problems to be Solved by the Invention] According to the structure of the conventional magnetic head device described above, during recording and reproduction, the magnetic head is displaced from the normal almost horizontal state shown in FIG. 6(A) due to the deflection of the disk 8. When the core section 10 is rotated in the track width direction as shown in FIG. 6(B), as shown in FIG. ′
If the deviation is large, recording and reproduction will not be performed correctly.

On the other hand, in order to eliminate such a deviation in track position, a structure is also adopted in which one magnetic head, for example, the lower magnetic head 4B, is directly fixed to the arm portion 3B without using the elastic plate 9.

However, in this case, although the deviation of the track position becomes smaller, the ability of the magnetic head 4B to follow the disk 8 deteriorates, and a gap is created between the disk 8 and the core section 10, which similarly prevents correct recording and playback. Put it away. In order to reduce the above-mentioned gap, it is necessary to increase the pressing force of the upper magnetic head 4A, which accelerates the wear of the disk 8 and makes the disk 8 more likely to be damaged.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention provides a head device of the type described in the field of industrial application, in which two head elements are arranged in the track width direction. Regarding the degree of freedom of rotation in the sliding direction, one of the head elements has approximately the same degree of freedom in both directions, and the degree of freedom in the track width direction of the other head element is approximately equal to or less than the degree of freedom in the sliding direction.

[Function] According to such a support structure, when the magnetic head 4B rotates in the track width direction following the displacement due to the deflection of the disk, the degree of freedom of rotation is less than half that of the conventional one, and the degree of rotation is limited. Since the angle is smaller, the deviation in track position is significantly smaller than in the past.

Correspondingly, the track position deviation of the upper magnetic disk 4A is also reduced. Further, due to the support structure which is rotatable in both directions, the ability of the magnetic head 4B to follow the disk is not impaired as much as in the past.

[Example] Hereinafter, details of an embodiment of the present invention are shown in FIG. 1(A).

This will be explained with reference to (B). Note that the above-mentioned magnetic head device is used as an example here, and a detailed explanation of the same parts of this example as those of the above-mentioned conventional example will be omitted.

In this embodiment, the upper magnetic head 4A is attached to the arm portion 3A via the elastic plate 9 in the conventional side movement described above.
It is rotatably supported with approximately the same degree of freedom in the track width direction and sliding direction.

On the other hand, the lower magnetic head 4B is attached to the arm portion 3B via an elastic plate 18 shown in FIG. 1(A). The elastic plate 18 is formed in a rectangular shape substantially similar to the conventional elastic plate 9 shown in FIG. 4, and has two pairs of opposing U-shaped long holes 18a,
18b, 18b are double punched with 90'' different directions. A rectangular frame 18C is formed inside the elongated holes 18a, 18a, and is connected to and supported by the periphery by bridge parts 18f, 18f. A rectangular mounting portion 18e for mounting the magnetic head 4B is formed inside the elongated holes 18b, 18b, and is connected to and supported by the frame portion 18c by bridge portions 18d.

18f has the same length as the conventional one and is equal to each other,
Regarding the width), the bridge portion 18d is the same as the conventional one, and the bridge portion L8f is more than twice the width.

The magnetic head 4B has a bridge portion 18d in the thickness direction (track width direction) of the core portion lO, as in the case of the conventional example described above.
, 18d, which is parallel to the arrow X direction in FIG. (B) Mount parallel to the direction of the middle arrow Y at section 18.
Attached to e.

With such a support structure, the magnetic head 4B is supported rotatably in the C direction along the track width direction (X direction) and the D direction along the orthogonal direction (Y direction). Due to the thickness relationship (that is, making 18f thicker), the degree of freedom of rotation in the sliding direction is the same as in the conventional case, and the degree of freedom in the track width direction is less than that of a waboso.

According to the support structure of the magnetic head 4B of this embodiment as described above, when the magnetic head 4B rotates in the track width direction following the displacement due to the deflection of the disk 8 during recording and reproduction, the degree of freedom of rotation is reduced. This is less than the conventional h, and since the angle of rotation is smaller, the deviation of the track position is significantly smaller than in the conventional case. Correspondingly, the deviation in the track position of the upper magnetic heald 4A is also reduced.

Further, the followability of the magnetic head 4B with respect to the disk 8 is not significantly impaired compared to the conventional example due to the above-described rotatable support structure by the elastic plate 18. There is no need to increase the pressure, and wear and damage to the disk 8 can be prevented.

The degree of freedom relationship of ``the degree of freedom in the track width direction is less than or equal to the degree of freedom in the sliding direction'' was confirmed to be appropriate after conducting experiments to balance the above-mentioned reduction in track position deviation and followability. It is what was done.

In addition, the lower magnetic head 4B is supported by the conventional elastic plate 9, and the upper head 4A is supported by the elastic plate 18, so that the rotational freedom of the upper and lower magnetic heads 4A, 4B is controlled.
may be reversed from this embodiment. However, in this embodiment, the re-magnetic head 4A,
Excellent followability of 4B.

In addition, in this embodiment, the thickness of the bridge portions 18d and 18f is +
The degree of freedom of rotation was determined by 111), but depending on the length,
Alternatively, it may be determined based on the ratio of both thickness and length.

Furthermore, I would like to add that the configuration of the present invention related to the degree of freedom of rotation as described above is not limited to magnetic head devices, but can of course be applied to all types of head devices described in the field of industrial application. It is.

[Effects] As is clear from the above description, according to the bed device of the present invention, regarding the degree of freedom of rotation of the two head elements that sandwich the disk-shaped recording medium, one of the elements has the width of the recording track. The track width direction is almost the same as the sliding direction of the element, and the degree of freedom in the track width direction is almost equal to the degree of freedom in the sliding direction.The structure is extremely simple and can be implemented at low cost, making it possible to follow the recording medium. It is possible to reduce the deviation in track position without impairing the performance of the recording medium, and to prevent damage and wear of the recording medium.

[Brief explanation of the drawing]

FIG. 1(A) is a top view of an elastic plate supporting one magnetic head of a magnetic head device according to an embodiment of the present invention.
B) is the magnetic field in Figure 1 (A). An explanatory diagram of the direction of rotation of the magnet.
Figure 2 is a side view of the entire device;
FIG. 3 is a cross-sectional view of the area around the upper magnetic head, FIG. 4 is a perspective view of the bottom side of the elastic plate, FIG. 5 is a cross-sectional view of the magnetic head in a rotated state, and FIG. 6 (A). (B) is an explanatory diagram showing track position deviation due to head rotation. 4A, 4B...Magnetic head 9.18...Elastic plate 10...Core portion 18a, 1
8b...Long hole 18c...Frame portion 18d, 18f.
...Bridge part 18e...Mounting is done in the part

Claims (1)

[Claims] A head device that records and reproduces information by sandwiching a disk-shaped recording medium between two head elements, and elastically supports the elements so as to be rotatable with a predetermined degree of freedom in a recording track width direction and in a direction perpendicular thereto. With respect to the degree of freedom of rotation, one of the elements has approximately the same degree of freedom in both directions, and the degree of freedom of the other element in the track width direction is approximately 1/2 or less of the degree of freedom in the orthogonal direction. head device.