JP3440554B2 - Magnetic head support device and method of assembling the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable optical recording medium, and a disk-shaped recording medium such as a rewritable magneto-optical recording medium which is rewritable by optical modulation or magnetic field modulation. The present invention relates to a magnetic head supporting device used in a recording and / or reproducing device for reading a signal and a method for assembling the same.

[0002]

2. Description of the Related Art Conventionally, a recording and / or reproducing apparatus uses a disk-shaped recording medium (hereinafter referred to as a magneto-optical disk) as an optical recording medium for information signals to record in a signal recording area of the magneto-optical disk. The read information signal is recorded or the information signal is recorded in the signal recording area.

Here, as an example, a recording / reproducing operation is performed in which an information signal is read from and reproduced from the magneto-optical disk by an optical pickup, and an information signal is written and recorded by sliding a magnetic head in contact with the magneto-optical disk. The device will be described.

A conventional recording / reproducing apparatus is generally composed of a recording / reproducing unit, a driving unit for driving the magneto-optical disk and the recording / reproducing unit, a chassis provided with the recording / reproducing unit and the driving unit, and a housing. Has been done. The recording / reproducing unit includes an optical pickup for reading an information signal from a signal recording area of the magneto-optical disk, a magnetic head supporting device for supporting the magnetic head, and a magnetic head for writing an information signal in the signal recording area of the magneto-optical disk. Composed of and.

The magnetic head supporting device is composed of a leaf spring member that swingably supports the magnetic head, a head arm that supports the magnetic head via the leaf spring member, and a bracket that supports the head arm. . The bracket is
The head arm has a substantially U-shaped cross section, and a fixed end portion of the head arm is joined and fixed to one end portion thereof, and an optical pickup is provided at the other end portion thereof. The head arm is formed in a substantially rectangular plate shape, and a leaf spring member is fixed to the free end portion. A magnetic head is welded to the free end of this leaf spring member.

The magnetic head supporting device supports the magnetic head via a leaf spring member so as to be swingable in the vertical direction with respect to the main surface of the magneto-optical disk. The magnetic head supporting device causes the magnetic head to follow the blur of the recording surface of the information signal of the magneto-optical disk by elastically deforming the leaf spring member.

Therefore, the magnetic head supporting device is required to press the magnetic head into contact with the main surface, which is the signal recording area of the magneto-optical disk, at a constant pressure during recording. Therefore, the magnetic head support device is required to set the position of the magnetic head in the vertical direction with respect to the main surface of the magneto-optical disk (hereinafter, referred to as the position in the height direction of the magnetic head) with high accuracy. .

Further, the magnetic head supporting device is moved by the drive unit with respect to the signal recording area of the magneto-optical disk together with the magnetic head and the optical pickup provided on the bracket so as to face the magnetic head. Then, the magnetic head supporting device searches and accesses the signal recording area of the magneto-optical disk. Therefore, in the magnetic head supporting device, alignment adjustment (centering) is performed so that the axis of the magnetic head and the axis of the objective lens included in the optical pickup match.

[0009]

By the way, in the conventional magnetic head supporting device, the head arm for swingably supporting the magnetic head is directly bonded and fixed to the joint surface of the bracket. Therefore, the position of the magnetic head in the height direction is affected by the dimensional accuracy of a plurality of members provided from the chassis to the magnetic head and supporting the magnetic head. That is, the position of the magnetic head in the height direction is
Since the dimensional tolerances of the respective members in the height direction are accumulated and variations occur, there is a problem that they are not stable.

The position of the magnetic head in the height direction is also affected by the fact that the joint surface of the bracket to which the head arm supporting the magnetic head is joined and fixed is inclined. That is, the position of the magnetic head in the height direction is also affected by the parallelism of the joint surface of the bracket.

Further, in the magnetic head supporting device, a clearance for bonding is not set between the joint surfaces of the head arm and the bracket. Therefore, in the magnetic head supporting device, the adhesive does not sufficiently penetrate between the joint surfaces of the head arm and the bracket, so that the adhesive area is small. Therefore, the magnetic head supporting device has a problem in that the bonding surface of the head arm and the bracket has low adhesive strength and peels off.

Furthermore, the above-described bonding work between the head arm and the bracket is manually performed by an operator. In this bonding work, since there is no quantitative guideline for the amount of adhesive applied, the amount of adhesive applied varies depending on the operator. Therefore, there is a problem that the bonding strength of the joint surface between the head arm and the bracket varies.

In view of the above, the present invention stabilizes the adhesive strength of the joint surface between the head arm and the bracket to position the magnetic head in the height direction with high accuracy and to operate the magnetic head reliably. It is to provide a head support device.

Further, according to the present invention, it is possible to eliminate the influence that the position of the magnetic head in the height direction is affected by the variation in the dimensional tolerance of each member supporting the magnetic head,
An object of the present invention is to provide a method of assembling a magnetic head supporting device that can be stabilized.

[0015]

In order to achieve the above object, a magnetic head supporting device according to the present invention comprises an optical pickup, a holding member for holding the optical pickup, and a holding member for holding the optical pickup.
One end is fixed to the bottom surface of the holding member of the optical pickup, the free end extends to the main surface side of the optical pickup to form a joint surface, and the adhesive is located at the approximate center of the joint surface. An approximately U-shaped head support member having a groove portion to be filled, and a fixed end portion is joined and fixed to the joining surface of the head support member with an adhesive, and the adhesive agent is filled in the groove portion at a position facing the groove portion. A head arm having an opening for confirming the state, an elastic member joined and fixed to the free end of the head arm, and a magnetic member fixed to the free end of the elastic member at a position facing the optical pickup. A head is provided, and the head arm and the head support member are joined and fixed by an adhesive in a state where a gap having a predetermined size is provided between the head arm and the head support member.

Further, the head arm is provided with an adhesion promoting portion including a notch and / or a protrusion at the outer peripheral edge portion on the fixed end side.

In the method of assembling the magnetic head supporting device according to the present invention, one end is fixed to the bottom surface of the optical pickup, the holding member for holding the optical pickup, and the holding member of the optical pickup, and the free end is A substantially U-shaped head support member extending to the main surface side of the optical pickup and having a joint surface, a head arm having a fixed end joined and fixed to the joint surface of the head support member with an adhesive, and a head arm A magnetic head supporting device comprising an elastic member joined and fixed to the free end of the elastic member, and a magnetic head fixed to the free end of the elastic member facing the optical pickup. A lower guide jig formed with a pair of support parts for supporting the bottom surface of the magnetic head, and a head arm supporting the magnetic head through an elastic member, which is provided so as to be movable in parallel with the lower guide jig. A guide jig composed of an upper guide jig that holds the optical head is used to position the magnetic head in the height direction with the bottom surface of the holding member that holds the optical pickup as a position reference. The first step of aligning the axis and the axis of the optical pickup with each other to provide a gap of a predetermined size between the head arm and the head support member, and the step of forming the head support member at a substantially central portion of the joint surface. By filling the groove portion with the adhesive and checking the state of the adhesive filled in the groove from the opening formed at the position facing the groove portion of the head arm, by adjusting the application amount of the adhesive, A second step of joining and fixing the head arm and the head support member with an adhesive in a state where a gap having a predetermined size is provided is performed.

[0018]

[0019]

[0020]

As described above, in the magnetic head supporting device according to the present invention, since the groove is formed on the joint surface of the head supporting member, the adhesive agent flows into the groove, so that it is bonded to the head arm. The agent penetrates easily. Also, due to the opening formed at the position facing the groove of the head arm,
The amount of the adhesive filled with the head supporting member can be visually confirmed. Then, the head arm and the head support member are joined and fixed with an adhesive in a state where a gap having a predetermined size is provided, so that the variation due to the dimensional tolerance of each member that supports the magnetic head is canceled. Further, an adhesion promoting portion including a notch and / or a protrusion is formed on the outer peripheral edge of the head arm on the side of the fixed end, so that the notch and / or the protrusion bites into the solidified adhesive. Since the effect is produced, the adhesive strength is increased.

Further, in the method of assembling the magnetic head supporting apparatus according to the present invention, the guide jig is used to position the magnetic head in the height direction with the bottom surface of the holding member holding the optical pickup as a position reference. By aligning the axis of the magnetic head with the axis of the optical pickup, the positioning of the magnetic head is accurately performed. Further, while filling the groove formed in the joint surface of the head support member with the adhesive, while checking the state of the adhesive filled in the groove from the opening formed at the position facing the groove of the head arm, By adjusting the amount of adhesive applied, the adhesive is applied in proper quantity, and the head arm is securely joined and fixed to the head support member. Further, since a space having a predetermined dimension is provided between the lower guide jig and the upper guide jig, the variation in the dimensional tolerance of each member supporting the magnetic head is absorbed by this space.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic head supporting device 1 in which an embodiment of the present invention is applied to a magneto-optical disk recording / reproducing apparatus will be described with reference to FIGS. The magnetic head supporting device 1 according to the embodiment includes a magnetic head 19, a leaf spring member 23 that supports the magnetic head 19, a head arm 6 that supports the magnetic head 19 via the leaf spring member 23, and the head arm 6. It is composed of a bracket 10 for supporting and an optical pickup 21 provided on the bracket 10.

The bracket 10 has a substantially U-shaped cross section and has a joint surface with the head arm 6 at one end. The bracket 10 is provided with a groove portion 10A having a substantially elliptical shape, which is located at a substantially central portion of the joint surface. Accordingly, since the bracket 10 is provided with the groove portion 10A when the head arm 6 is fixed, the adhesive flows into the groove portion 10A, so that the bracket 10 easily penetrates into the joint surface with the head arm 6. You can Further, the bracket 10 is provided with an optical pickup 24 at the other end.

The head arm 6 is formed in a substantially rectangular plate shape, and its fixed end is fixed to the joint surface of the bracket 10. The head arm 6 has a leaf spring member 2 at its free end.
One end of 3 is joined and fixed. The head arm 6 has a substantially elliptical opening 6A formed at a position facing the groove 10A provided on the bracket 10 such that the axes of the head arm 6 and the groove 10A are orthogonal to each other. Head arm 6
When the joint is fixed to the bracket 10, the state of the adhesive that has penetrated into the groove 10A provided in the bracket 10 is visually confirmed.

As shown in FIG. 2, the head arm 6 has a first cut 12A and a second cut 12B formed at the corner and the one end on the fixed end side. Further, the head arm 6 is provided with semicircular first notch portions 16A to fourth notch portions 16D at both end portions, respectively.

The leaf spring member 23 is formed in a substantially rectangular shape,
One end is fixed to the head arm 6, and the magnetic head 19 is welded and fixed to the other end. Therefore, the magnetic head 19 is supported by the head arm 6 via the leaf spring member 23 so as to be swingable in the vertical direction with respect to the main surface of the magneto-optical disk.

The optical pickup 24 has an objective lens 24A.
And is provided at one end of the bracket 10. Also. The optical pickup 24 is provided with the optical axis of the objective lens 24A and the axis of the magnetic head 19 supported by the head arm 6 aligned with each other.

As described above, the magnetic head supporting device 1
As shown in FIG. 3, the adhesive penetrates into the groove 10A provided in the bracket 10 and the head arm 6 is fixed in a state of being floated by the adhesive.

The magnetic head supporting device 1 according to the embodiment is not limited to the head arm 6 and the bracket 10 described above, but may be applied to the magnetic head supporting device using other head arms and brackets described below. Be expanded.

As shown in FIG. 4A, the head arm 7 which is the main part of the magnetic head support device 2 of the second embodiment will be described. The head arm 7 has a circular opening 7A at a position facing the groove 10A provided on the bracket 10.
Are formed. In addition, the head arm 7 has a corner portion on the fixed end side and a first notch 13A at one end portion.
And the second notch 13B are formed respectively.
Further, the head arm 7 is formed with semicircular first protrusions 17A to third protrusions 17C along both side ends.

As shown in FIG. 4B, the head arm 8 which is a main part of the magnetic head support device 3 of the third embodiment.
Will be described. The head arm 8 has a bracket 1
A substantially rectangular opening 8A is formed at a position facing the groove 10A provided at 0. In addition, the head arm 8 has a first cut 14A and a second cut 14B formed at the corner and the one end on the fixed end side, respectively. Further, the head arm 8 is formed with first to third semicircular cutouts 18A to 18C along both side ends.

Further, as shown in FIG. 4C, the bracket 11 and the head arm 9 which are the main parts of the magnetic head support device 4 of the fourth embodiment will be described. The bracket 11 is provided with a substantially elliptical groove portion 11A located at a substantially central portion of the joint surface. A substantially elliptical opening 9A is formed in the head arm 9 at a position facing the groove 11A provided in the bracket 11. Further, the head arm 9 has a first cut 15A and a second cut 15B formed at the corner and the one end on the fixed end side, respectively.

Therefore, the magnetic head supporting apparatus according to the embodiment can accurately position the position of the magnetic head 19 in the height direction with respect to the bracket without being affected by the dimensional accuracy of each member. Therefore, the magnetic head 19 can be accurately operated in the vertical direction with respect to the main surface of the magneto-optical disk.

Further, in the magnetic head supporting device, since the adhesive is easily penetrated along the groove by providing the groove in the bracket, the adhesive area is widened and the adhesive strength between the bracket and the head arm is improved. To be done. In the magnetic head supporting device of the embodiment, the adhesive strength can be increased by increasing the width dimension of the groove portion provided in the bracket, if necessary. Further, in the magnetic head supporting device, since the notch and / or the protrusion is formed on the outer peripheral edge of the head arm, the head arm bites into the solidified adhesive, so that the adhesive strength is improved.

In the magnetic head supporting device, since the opening is formed in the head arm, the amount and permeation state of the adhesive can be easily confirmed visually. Therefore, in this magnetic head supporting device, there is no variation in the coating amount such as an insufficient coating amount of the adhesive during the bonding work, so that the bonding strength is stabilized.

A method of assembling the magnetic head supporting device 1 having the above-described structure will be described below. The magnetic head supporting device 1 is assembled using a guide jig 20 as shown in FIGS. Guide jig 20
Is composed of a lower guide jig 21 and an upper guide jig 22 provided so as to be movable in parallel with the lower guide jig 21.

The lower guide jig 21 has a pair of substantially rectangular first support projections 29A and second support projections 29B integrally formed on the main surface of the base 21A. Also,
The lower guide jig 21 is composed of a table portion 21B integrally formed by folding one end of the base portion 21A in an L shape.

The upper guide jig 22 is formed in a substantially rectangular plate shape, and one end thereof is provided on the table portion 21B. The upper guide jig 22 holds the head arm 6 on the surface of the lower guide jig 21 at the other end facing the base portion 21A. A gap having a predetermined dimension D is provided between the sliding surfaces of the upper guide jig 21 and the lower guide jig 22.

Using the guide jig 20 having the above-described structure, the magnetic head supporting device 1 has the first step and the second step.
It is assembled through the process of. First, in the first step, as shown in FIG. 5, the magneto-optical disk recording / reproducing apparatus 5 including the magnetic head supporting apparatus 1 is arranged on the guide jig 20.

The magneto-optical disc recording / reproducing apparatus 5 is
In general, it is composed of a magnetic head supporting device 1, a main shaft 25 and a sub shaft 26 for driving the magnetic head supporting device 1, a disk cartridge 30 having a magneto-optical disk 31, and a chassis member 27. The optical pickup 24 provided on the magnetic head supporting device 1 is held by the chassis member 27.

The recording / reproducing apparatus 5 is provided with a shift lever 28 for retracting the magnetic head 19 from the inside of the disk cartridge 30 to the outside by pushing up the leaf spring member 23 of the magnetic head supporting device 1. There is. Therefore, in the recording / reproducing apparatus 5, the magnetic head 19 is prevented from coming into contact with the disk cartridge 30 when the disk cartridge 30 is inserted and ejected.

In the magnetic head supporting device 1, the bottom surface of the chassis member 27 for holding the optical pickup 24 has a first supporting projection 29A and a second supporting projection 29A formed on the base 21A of the lower guide jig 21. It is supported by the portion 29B. That is, the magnetic head supporting device 1 uses the bottom surface of the chassis member 27 that holds the optical pickup 24 as a position reference.
The position of the magnetic head 19 in the height direction is determined by the upper guide jig 22. The magnetic head support device 1 also performs alignment adjustment in a state where the axis of the magnetic head 19 and the optical axis of the objective lens 24A of the optical pickup 24 are aligned.

Next, the bracket 10 and the head arm 6
In the second step of joining and fixing and with the adhesive, the head arm 6 is attached by causing the adhesive to flow into the groove portion 10A provided in the bracket 10. Then, from the opening 6A formed in the head arm 6 to the bracket 10
By confirming the state of the adhesive that has penetrated into the groove portion 10A, the application amount of the adhesive is adjusted and the adhesive is fixed. Therefore, the adhesive is applied to the bracket 10 without excess or deficiency, and the head arm 6 is securely joined and fixed.

Further, the head arm 6 includes the lower guide jig 2
1 and the upper guide jig 22 are provided with a gap of a predetermined dimension D, so that they are floated by an adhesive, so that they are fixedly joined together with the gap of a predetermined dimension D provided with the bracket 10. Has been done.

As described above, the method of assembling the magnetic head supporting apparatus according to the embodiment is performed by the lower guide jig 21 and the upper guide jig 22.
A guide device 20 in which a gap of a predetermined dimension D is provided between
The head arm 6 with a predetermined dimension D using an adhesive.
By joining and fixing in a floating state, it is possible to cancel the variation due to the dimensional tolerance of each member supporting the magnetic head 19. Therefore, this magnetic head supporting device assembling method can stabilize the position of the magnetic head in the height direction.

Further, in the method of assembling the magnetic head supporting apparatus of the embodiment, since the groove portion 10A is provided in the bracket 10, the dimensional tolerance of each member for supporting the magnetic head 19 varies remarkably. And bracket 1
Even when 0 comes into surface contact, the adhesive penetrates into the groove 10 </ b> A to secure the adhesive area. Therefore, this magnetic head supporting device assembling method can maintain the adhesive strength.

Further, in the method of assembling the magnetic head supporting device of the embodiment, the opening 6A is formed in the head arm 6 at the position facing the groove 10A provided in the bracket 10, so that the bracket 10 is provided in the bracket 10. The state of the amount of the adhesive penetrating into the groove portion 10A and the like can be easily visually confirmed from the opening portion 6A. Therefore, in this method of assembling the magnetic head supporting device, there is no variation in the amount of adhesive applied by the operator, and the amount of adhesive applied is stabilized. Therefore, in the magnetic head supporting device 1, since the adhesive strength is made constant, peeling is prevented from occurring at the joint surface between the head arm 6 and the bracket 10.

[0048]

As described above, according to the present invention, since the groove is formed in the head supporting member, the bonding strength between the head arm and the head supporting member is stabilized. Also, by checking the state of the adhesive filled in the groove from the opening formed at the position facing the groove of the head arm, the amount of adhesive applied can be made uniform and the adhesive strength is stabilized. It In addition, since the head arm and the head supporting member are fixedly bonded with an adhesive in a state where a gap having a predetermined size is provided, it is possible to cancel the variation due to the dimensional tolerance of each member supporting the magnetic head. The position of the magnetic head in the height direction can be stabilized. Further, by providing the notch and / or the protrusion on the outer peripheral edge of the head arm, it is possible to improve the adhesive strength between the head arm and the head support member.

Further, according to the present invention, by assembling using the guide jig, the position of the magnetic head in the height direction can be easily and surely positioned and the position accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head support device according to the present invention.

FIG. 2 is a plan view showing a joint between a head arm and a bracket, which is a main part of the magnetic head support device.

FIG. 3 is a vertical cross-sectional view showing a joint between a head arm and a bracket, which is a main part of the magnetic head support device.

FIG. 4 is a plan view showing an example of a joint between a head arm and a bracket, which is a main part of the magnetic head support device.

FIG. 5 is a vertical cross-sectional view showing a state in which the magnetic head supporting device is assembled using a guide jig.

FIG. 6 is a perspective view showing a guide jig used in the method of assembling the magnetic head supporting device.

[Explanation of symbols]

1 Magnetic head support device 5 Recording / reproducing device 6 head arm 6A opening 10 Bracket (head support member) 10A groove 19 magnetic head 20 Guide jig 21 Lower guide jig 22 Upper guide jig 23 Leaf spring member (elastic member) 24 Optical pickup 29A First support protrusion 29B Second support protrusion

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Claims (3)

(57) [Claims] 1. An optical pickup, a holding member for holding the optical pickup, and one end portion fixed to a bottom surface portion of the holding member of the optical pickup, and a free end portion extending to a main surface side of the optical pickup. To form a joint surface, and place it in the approximate center of this joint surface.
A head supporting member having a U-shape in which a groove portion is formed to be filled with an adhesive, and a fixing end portion is bonded and fixed to the joint surface of the head supporting member with an adhesive and faces the groove portion. In the groove above
The opening for checking the state of the adhesive filled in
Comprising a head arm which is formed, and an elastic member which is joined and fixed to the free end of the head arm, a magnetic head which is fixed to the optical pickup and the position facing the free end of the elastic member, the head A certain distance between the arm and the head support member
Bonded and fixed with an adhesive in the state that the gap of the method is provided
A magnetic head supporting device characterized in that 2. The magnetic head support according to claim 1, wherein the head arm is provided with an adhesion promoting portion including a notch portion and / or a protrusion portion at an outer peripheral edge portion on the fixed end side. apparatus. 3. An optical pickup, a holding member for holding the optical pickup, and a bottom portion of the holding member of the optical pickup, one end of which is fixed and a free end of which extends to a main surface side of the optical pickup. Substantially U-shaped head support member having a joint surface formed thereon, a head arm having a fixed end joined and fixed to the joint surface of the head support member with an adhesive, and a joint end fixed to a free end portion of the head arm. And a magnetic head fixed to the free end of the elastic member facing the optical pickup, the magnetic head supporting device being assembled. A lower guide jig formed with a pair of supporting portions for supporting, and the head which is provided so as to be movable in parallel to the lower guide jig and supports the magnetic head through the elastic member. A guide jig composed of an upper guide jig that holds the arm is used to perform positioning in the height direction of the magnetic head with the bottom surface of the holding member that holds the optical pickup as a position reference. A first axial axis of the magnetic head and an optical axis of the optical pickup are aligned with each other, and a gap having a predetermined size is provided between the head arm and the head supporting member.
And the step of filling the adhesive in the groove formed at approximately the center of the joint surface of the head support member, and
From the opening formed at the position facing the groove of the chamber
While checking the state of the adhesive filled in the groove,
A second step of joining and fixing the head arm and the head supporting member with an adhesive in a state where a gap of a predetermined size is provided by adjusting the application amount of the adhesive. And method for assembling a magnetic head supporting device.