JP2853826B2 - Magnetic head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device in which a head body facing a recording medium is mounted on a support member, and in particular, the head body is positioned and mounted on the support member with high precision. The present invention relates to a magnetic head device described above.

[0002]

2. Description of the Related Art FIG. 6 is a plan view showing a conventional example of a magnetic head device used in a magneto-optical disk device, and FIG. 7 is a side view of FIG. The magnetic head device includes a support member 2 and a head body 1 attached to the support member 2. The head body 1 has a slider 1a facing the recording medium, and a core assembly 1b is held on the slider 1a. The core assembly 1b includes a core and a coil wound on the core, and the magnetic gap G of the core assembly 1b appears on the lower surface of the slider 1a.

The support member 2 includes a load beam 4, an adapter 3a fixed to the lower surface of the front end of the load beam 4, and an adapter 3a.
The slider 1a is attached to the flexure 3b. The load beam 4 has a leaf spring function portion at a portion 4a, and a mount member 5 is mounted on the base end thereof in an overlapping manner. Base of load beam 4 and mounting member 5
Are provided with fixing holes 6, 6 penetrating both members.
The load beam 4 is fixed to a drive arm or the like by the fixing holes 6, 6, and the fixing holes 6, 6 serve as a mounting reference for the entire magnetic head device.

[0004] A pair of reference holes 4 are provided at the tip of the load beam 4.
b, 4b are drilled. The adapter 3a is aligned with the reference holes 4b, 4b and fixed by means such as welding. The head body 1 is attached to the flexure 3b by bonding or the like. At this time, a jig is used, and the head body 1 is referenced with respect to the reference holes 4b.
Is determined. In the magneto-optical disk, the head body 1 is formed by the elastic force of the leaf spring function portion 4a of the load beam 4.
Is lightly pressed against the upper surface of the disk. When the disk rotates, the head body 1 is brought into a floating posture by the airflow on the upper surface of the disk. Then, the recording film in the disk is irradiated with laser light from the lower surface of the disk and heated. At this time, a perpendicular magnetic field is applied to the recording surface from the magnetic gap G of the head main body 1, thereby recording a signal.

[0005]

When the magnetic head device shown in FIGS. 6 and 7 is installed in the disk device, the fixing holes 6 and 6 of the load beam 4 are attached to the drive arm. In the recording operation, the head body 1 is driven in the X direction by the drive arm, whereby the magnetic gap G moves in the radial direction of the disk. By this tracking operation, control is performed so that the moving position of the heating spot of the laser beam and the moving position of the magnetic gap G match. In order for the recording operation to be performed accurately, the magnetic gap G of the head main body 1 needs to be positioned within a predetermined tolerance range with respect to a predetermined reference position of the drive arm.
Therefore, when the magnetic head device shown in FIG. 6 is assembled, the distance L1 in the X direction from the center of the fixing hole 6 to the magnetic gap G must be set within a predetermined tolerance range. The magnetic gap G must be located within a predetermined tolerance range in the Y direction with respect to the fixing holes 6, 6 formed at intervals of L2. In the magnetic head device shown in FIG. 6, the tolerance of the position of the magnetic gap G with respect to the centers of the fixing holes 6 and 6 is ± 0.5 in the X and Y directions.
About 15 mm is common.

In order to satisfy the above-mentioned tolerance, conventionally, when the head body 1 is bonded to the flexure 3b, a jig is used to refer to the center of one of the reference holes 4b as a reference.
The distance (a) to the side surface of the head body 1 is determined, and the distance (b) to the leading end surface of the head main body 1 is determined with reference to the center of the other reference hole 4b. However, even in the head body 1 itself, there is a manufacturing error in the distance from the side surface and the end surface to the magnetic gap G, and in the bonding operation, the head body 1 is likely to be displaced due to curing distortion of the adhesive immediately after bonding. . Therefore, after assembly is completed,
Errors in the X and Y directions of the distance between the fixing holes 6 and 6 and the magnetic gap G often deviate from within the above-mentioned tolerances, and the defect rate is high. Further, at the time when the assembly of the magnetic head device is completed, it is difficult to measure the distance between the magnetic gap G that appears on the recording medium facing surface side of the head main body 1 and the center of the fixing holes 6 and 6. It is difficult to inspect whether or not the position of G is actually within the tolerance range, and it is also difficult to determine a defective product.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is easy to determine whether or not a magnetic function portion of a head main body is accurately positioned with respect to a reference position on a support member. On the other hand, it is an object of the present invention to provide a magnetic head device in which a magnetic function portion of a head body can be positioned and mounted with high precision.

[0008]

SUMMARY OF THE INVENTION The present invention provides a load beam.
A flexure formed by a leaf spring is attached to the lower surface of the tip of
The flexure has a head having a magnetic function part.
In the magnetic head device to which the main body is fixed,
A hole or notch is formed in the head beam and the head
Indicates the center of the magnetic function of the body or the center of this magnetic function.
Mark is inserted into the load beam through the hole or notch.
With the load beam directly visible from the top side of the
And the head body is positioned and fixed to the flexure
It is characterized by having been done.

In the above, the center of said hole or notch
The position is determined with reference to the fixed part of the load beam.
The opening dimension of the hole or notch is
Within the tolerance of the positioning error of the magnetic function part
It is preferable to set as follows.

[0010]

In the above means, the load beam of the head main body is directed.
The center of the magnetic function part or the center of this magnetic function part
Markings are provided, which are the holes in the load beam.
Or by being within the notch view range, the magnetic function
Precisely positioned with respect to the specified position of the load beam
Can be determined. With this, the load beam and magnetic machine
Dimensional accuracy of flexures and other parts between the active part
Of the magnetic function part on the head body.
The tolerances of the tolerances are also widened, and
Can be.

Here, the opening size of the hole or notch
Is the positioning error of the magnetic function part with respect to the load beam.
Hole or cutout if it is set within the allowable range of
From the center of the magnetic function part or the center of this magnetic function part
When the mark indicating
Tolerance of positioning error with respect to fixed part of beam
It can be determined that it is positioned in the enclosure.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a partially exploded perspective view showing a floating type magnetic head device provided in a magneto-optical disk device as one embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a core assembly held by a slider of a head main body. , FIG. 3 is a development view of the load beam,
FIG. 4 is a plan view of the magnetic head device in an assembled state, and FIG. 5 is a partially enlarged view of FIG. This magnetic head device
It is composed of a head body 21 and a support member 40 that supports the head body 21. The head main body 21 has a slider 22 and a core assembly 25 held in the slider 22. The slider 22 is formed of a non-magnetic material such as ceramic. The lower surface in FIG. 1 is a surface facing the recording medium, and the upper surface in FIG. 1 is a support side supported by the support member 40. On the support side, a projection 22a,
22b, 22c, 22d, 22e and 22f are formed. Grooves 23a, 23 are provided in the protrusions 22a, 22b, 22c.
b, 23c are formed. The core assembly 25 includes the protrusion 2
The lower surface of the core assembly 25, which is held between 2a and 22b, is flush with the surface of the slider 22 facing the recording medium.

As shown in FIG. 2, a core assembly 25 includes a center core 26 and side cores 2 joined to both sides thereof.
7, 27, a center core 26 and side cores 27, 2
7 and a back core 31 joined to the upper surface of the base 7.
A bobbin 30 around which a coil 29 is wound is extrapolated to the center core 26. Center core 26 and side core 27,
27 are joined by non-magnetic materials 28, 28 such as glass. On the lower surface of the core assembly 25, a pair of magnetic gaps G are formed on the opposing surfaces of the center core 26 and the side cores 27, 27.
Are formed adjacent to each other. When the core assembly 25 is mounted on the slider 22 shown in FIG. 1, the back core 31 is fitted in the grooves 23a and 23b, and the pair of magnetic gaps G, G appear on the lower surface of the slider 22. I have.

In the core assembly 25, a magnetic function portion is formed by the pair of magnetic gaps G, G. On the upper surface of the back core 31, a mark M corresponding to the center point of the magnetic function portion is formed. The mark M is a confirmation unit. The mark M is formed at a position where the center of the pair of magnetic gaps G and G, that is, the center line 26a of the center core 26 is extended upward. The mark M is formed by imprinting an indentation on the upper surface of the back core 31 with a very sharp punch or the like. The marking operation of the mark M can be performed in a state where the core assembly 25 is incorporated in the slider 22. For example, a prism is arranged on the lower surface of the slider 22, and the magnetic gaps G, G
Is reflected by this prism, and the image is projected on the upper surface side of the slider 22 by a plurality of prisms. In this image, a mark M may be imprinted on the back core 31 at a position that is the center of the magnetic gaps G and G.

Alternatively, without providing the back core 31, the side cores 27 and 27 may be formed in a C shape so that the upper end surface of the center core 26 appears on the upper surface of the slider 22, and a mark M may be stamped at the center of the center core 26. In this case, the mark M may not be provided, and the center of the upper end surface of the core 26 may be used as the confirmation unit. In the case of a slider provided with only one magnetic gap G, a mark M is marked on the upper surface of the slider at a vertically symmetric position of the magnetic gap. Also in this case, the mark may not be provided, and the upper end surface of the core may be made to appear on the upper surface of the slider 22, and the edge of the core may be used as the confirmation portion.

The support member 40 includes a load beam 41, an adapter 45, and a flexure 50. The load beam 41 is formed of a leaf spring material, and has bent portions 41a, 41a formed on both sides from an intermediate position to a front portion, and this portion has a rigid structure. Positioning holes 42, 42 of the adapter 45 and a hole 43 for visually recognizing the mark M are formed at the tip of the flat portion 41b sandwiched between the bent portions 41a, 41a.
The load beam 41 is a leaf spring function part 41c from the end of the bent parts 41a, 41a to the rear part, and further the rear part is a fixing part 41d. The fixing portion 41d has fixing holes 44a, 44a and positioning holes 4a.
4b is formed. A mount member 60 is attached to and fixed to the fixing portion 41d of the load beam 41 in an overlapping manner. The mounting member 60 has fixing holes 60a, 60a.
And a positioning hole 60b. As shown in FIG. 4, the fixing holes 60a, 60a coincide with the fixing holes 44a, 44b of the load beam 41 in the Y direction, and the positioning holes 60b are formed.
Coincides with the positioning hole 44b of the load beam 41 in the Y direction.

As shown in a developed view in FIG. 3, since the outer dimensions of the load beam 41 and the processing of each hole are performed by etching, the dimensional accuracy can be made extremely high. Similarly, the outer shape and the hole of the mount member 60 are processed with high precision, and the load beam 41 and the mount member 60 are positioned with high precision based on the fixing holes 44a, 44a and the positioning hole 44b of the load beam 41. Being welded. Therefore, when the mount member 60 is fixed to the load beam 41, first, the fixing holes 60a,
The distance L1 in the X direction from the center of the hole 60a to the center of the hole 43 is set with high accuracy. A center line O extending in the X direction through the hole 43 coincides with the center of the positioning hole 60b. The pair of fixing holes 60a, 60a
Are located with a high-precision distance L2 at a position allocated to.

Therefore, when the base of the load beam 41 and the mount member 60 are attached to the drive arm,
The positioning of the hole 43 in the X direction is performed with high precision based on the fixing holes 60a and 60a, and the positioning of the hole 43 in the Y direction is performed with high precision based on the positioning hole 60b. Further, the opening size, that is, the diameter (d) of the hole 43 is set so as to be within the allowable tolerance range in the X and Y directions of the magnetic function part with reference to the fixing holes 60a, 60a and the positioning hole 60b. . In a general magneto-optical disk drive, the hole 60
X of the magnetic function part with reference to a, 60a and the hole 60b
Since the tolerance between the position in the direction and the position in the Y direction is ± 0.15 mm, in this case, the diameter (d) of the hole 43 is set to 0.3 mm or less.

As shown in FIG. 1, the adapter 45 is formed in a concave shape, and the positioning holes 4
6a and 47a are formed. Positioning holes 46a, 4
The adapter 45 is welded to the load beam 41 with 7a aligned with the positioning holes 42 of the load beam 41. The adapter 45 has a bottom 48a via a step.
And 48b are formed. One bottom 48a is formed with a pivot 49 projecting downward in a spherical shape, and the other bottom 48 is formed.
A positioning hole 48c is formed in b.

The flexure 50 is formed by a thin leaf spring.
5 and is fixed to the bottom 48b of the adapter 45 by welding or the like. On both sides of the tip of the flexure 50, projecting pieces 53,5
3, and a tongue piece 52 separated by a groove 52a is formed at the center. With the protruding pieces 53, 53 inserted into the grooves 24a, 24b on the leading side of the slider, the area indicated by (b) of the tongue piece 52 is adhered to the concave bottom surface 22g of the slider 22. The upper surface of the tongue piece 52 of the flexure 50 is abutted against the pivot 49 of the adapter 45, and the slider 22 is moved by the elasticity of the flexure 50.
The posture can be freely changed with the vertex of the pivot 49 as a fulcrum.

Next, the assembly of the magnetic head device will be described. A mounting member 60 is provided at the base of the load beam 41.
Are welded, an adapter 45 is welded to the tip, and a flexure 50 is welded to the adapter 45. The slider 22 is bonded to the flexure 50. As one method of this assembling, the same operation as in the related art is performed. That is, the jig is used to position the side surface and the leading-side end surface of the slider 22 with reference to the positioning holes 42 formed in the load beam 41, and the slider 22 is bonded to the flexure 50. Thus, the positioning dimensions (a) and (b) of the slider 22 are set based on the positioning holes 42, 42 (see FIG. 6).

When the bonding operation is completed, the completed magnetic head device is positioned by a jig, and the hole 43 is visually recognized from above the flexure 50 using an optical device. At this time, as shown in FIG. 5, if the mark M stamped on the back core 31 of the head main body 21 is located within the opening area of the hole 43, it can be confirmed that the product is good. That is,
The holes 43 are fixed holes 60a, 60a and positioning holes 60b.
The hole is drilled at a high precision position based on
3 is set within a tolerance range (for example, a diameter of 0.3 mm) of the position of the magnetic function part with respect to each hole, the mark M is set within the opening area of the hole 43. If it is located, the magnetic function unit is located within the tolerance range. When the mark cannot be visually recognized within the opening area of the hole 43, it means that the position of the magnetic function part is out of the above-mentioned tolerance, so that it is determined to be defective.

As another method of assembling, the mark M can be confirmed through the hole 43 during the bonding operation. That is, in the operation of bonding the slider 22, the hole 43 is observed by an optical device, and when the mark M is within the visible range of the hole 43, the adhesive is cured by, for example, ultraviolet irradiation. In this assembling method, since the bonding operation is performed while accurately positioning the magnetic function portion with respect to the load beam 41, the probability of occurrence of defective products is extremely low.
If this assembling method is adopted, the dimensional accuracy of components such as the adapter 45 and the flexure 50 can be made rougher than before, and the tolerance of the mounting tolerance of the core assembly 25 in the head main body 21 becomes wider, thereby reducing the processing cost. Can be lowered.

The diameter (d) of the hole 43 described above is set according to the accuracy when the load beam 41 is attached to the drive arm. When the positioning accuracy between the load beam 41 and the drive arm is high, in the magnetic head device shown in FIG. (D) can be increased. When a certain error occurs in the mounting structure between the load beam and the drive arm, the diameter (d) may be reduced in consideration of the error. In the above embodiment,
A circular hole 43 is formed in the load beam 41,
For example, when a large positional tolerance of the magnetic function unit in any of the X direction and the Y direction is allowed, a long slot may be used in this allowable method. Instead of the hole 43, a notch formed in a concave shape inward from the edge of the load beam may be formed, and the confirmation portion may be visually recognized in the notch.

In the above embodiment, since the mark M indicating the magnetic function portion of the head body is located within the width of the load beam 41 as shown in FIG. 43 is formed, but when the position of the magnetic function part is deviated upward from the edge of the load beam 41 in FIG. 5, for example, the magnetic function part extends in the direction of the magnetic function part from the edge of the load beam 41. An arm may be provided, and a hole 43 may be formed in the arm. The hole 43 or the notch does not necessarily have to be provided in the load beam 41. For example, when only the adapter 45 is located above the magnetic function part, a hole for visual recognition may be formed in the adapter 45. In this case, the opening size of the hole may be formed slightly smaller in consideration of the mounting tolerance between the adapter and the load beam.

The adapter 45 may not be provided, and the flexure 50 may be directly attached to the load beam 41. Also, the mark M serving as a confirmation portion is provided at two positions with high precision at an arbitrary position on the head body, not at a symmetric position such as the magnetic gap G, and two holes 43 are formed in the load beam 41 and the like. Two holes 43
It may be determined that the mark M is good when each of the marks M is visually recognized.

[0027]

According to the present invention, a load beam is formed on a load beam.
The magnetic function of the head body is
Visual inspection reduces the failure rate during assembly
Or, it is easy to determine a good product after assembly. Also, Lord Bee
Check the magnetic function part from the hole or notch formed in the
Positioning can be performed while flexures and other parts
The dimensional accuracy of the product can be made rough, and the magnetic
The allowable range of the mounting tolerance of the air function part can be widened.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a floating magnetic head device installed in a magneto-optical disk device as one embodiment of the present invention;

FIG. 2 is an exploded perspective view of a core assembly held by the head body.

FIG. 3 is a development plan view of a load beam,

FIG. 4 is a plan view showing the magnetic head device after assembly is completed.

FIG. 5 is a partially enlarged view of FIG. 4,

FIG. 6 is a plan view showing a conventional example of a magnetic head device.

7 is a side view of FIG. 6,

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Head main body 22 Slider 25 Core assembly 40 Supporting member 41 Load beam 41a Bending part 41b Flat part 41c Leaf spring function part 41d Fixed part 42 Positioning hole 43 Hole 45 Adapter 46a Positioning hole 47a Positioning hole 48c Positioning hole 49 Pivot 50 Flexure 51 Positioning hole 52 Tongue piece 60 Mounting member 60a Fixing hole 60b Positioning hole G Gap M mark (confirmation part)

Claims (2)

(57) [Claims] 1. A leaf spring is formed on a lower surface of a front end of a load beam.
The flexure is attached, and this flexure
The magnetic body to which the head body having the magnetic function section is fixed
In the air head device, holes or cuts are made in the load beam.
A notch is formed, and the center of the magnetic function part of the head main body is formed.
Alternatively, the mark indicating the center of the magnetic function part is
Is directly visible from the top side of the load beam through the notch
The head body with respect to the load beam
And a magnetic head device fixed to the flexure . 2. The method according to claim 1 , wherein the center position of said hole or notch is
It is determined based on the fixed part of the load beam, and
Or the notch opening size is
Set so that the positioning error
The magnetic head device according to claim 1, wherein that.