JP2000339610A - Magnetic head device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic head device which allows the easy formation of a head holding part and a mounting plate in a shortest stage and is capable surely positioning magnetic heads to hold the heads. SOLUTION: The mounting plate 21 and the head holding part 22 are integrally formed by one metallic sheet. The magnetic head H2 and an erasing head H3 are elastically held in the head holding part 22. At this time, both heads are positioned on the basis of a tape guide part 23. The heads and the head holding part 22 may be surely grounded and connected by elastic holding.

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 installed in a tape recorder or the like, and more particularly to a magnetic head device in which a holding portion for holding a magnetic head and a mounting plate for mounting the device are formed of a single metal plate. Magnetic head device.

[0002]

2. Description of the Related Art FIG. 10 is a perspective view showing a conventional magnetic head device. In this magnetic head device, the magnetic head H is held in contact with the head holding unit 2. The head holder 2 is provided with a mounting part 2 a for mounting the head holder 2 to the mounting plate 1. The head holding portion 2 and the mounting portion 2a are formed by sheet metal working of a conductive plate material. The mounting plate 1 is also formed by sheet metal processing of a conductive material.

[0003] A head holding portion 2 holding a magnetic head H is joined to a mounting plate 1 by spot welding at a mounting portion 2a. The mounting plate 1 is fixed by inserting mounting screws into the mounting holes 1a and the mounting grooves 1b, and screwing the mounting plate 1 to a head base (not shown) of a device such as a tape recorder.

The azimuth angle of the magnetic gap G of the magnetic head H is adjusted by adjusting the amount of tightening of the screw inserted into the groove 1b of the mounting plate 1 and adjusting the bending degree of the mounting plate 1. .

[0005] The head holding section 2 is provided with a tape guide section 3 for guiding the running of the magnetic tape. The magnetic tape runs while the position in the track width direction is regulated by the guide groove 3 a of the tape guide section 3, and slides on the sliding surface Ha of the magnetic head H. By the guiding operation of the tape guide section 3, the magnetic tape and the magnetic gap G are aligned in the track width direction.

[0006]

However, the magnetic head device shown in FIG. 10 has the following disadvantages.

(1) The head holding part 2 and the mounting plate 1 are formed separately, and it is necessary to mount the head holding part 2 and the mounting plate 1 by spot welding or the like, and the assembling work is complicated. .

(2) When the magnetic tape slides on the sliding surface Ha of the magnetic head H, it is charged with static electricity. If the static electricity is not grounded from the mounting plate 1 to the head base of the apparatus main body, it may cause a discharge noise or the like. Become. In the conventional magnetic head device, since the magnetic head H is inserted and held in the head holding unit 2 with a gap, the magnetic head H and the head holding unit 2
The electrical grounding is not sufficient. Therefore, it is necessary to secure the ground by bonding the magnetic head H and the head holding unit 2 with a conductive adhesive such as a silver paste.
Use of a conductive adhesive such as the silver paste increases costs.

(3) As described above, the magnetic head H is held in the head holding unit 2 with a gap therebetween and is fixed by the adhesive as described above. The magnetic head H cannot be positioned reliably. Therefore, a large adjustment such as the azimuth angle when the magnetic head device is attached to the device is required.

(4) Since the conventional magnetic head device shown in FIG. 10 is mounted on the main body of the apparatus with reference to the mounting hole 1a of the mounting plate 1, the position of the top Hb of the sliding surface Ha of the magnetic head H is determined. It is necessary to set a predetermined value (A) based on the center of the mounting hole 1a. However, in order to determine the position of the top Hb based on the center of the mounting hole 1a,
A complicated positioning jig is required, and the positioning operation is complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a magnetic head device which can easily form a head holding portion and a mounting plate in the shortest steps, and can reliably position and hold a magnetic head. It is intended to provide.

Another object of the present invention is to provide a magnetic head device which can reliably secure the ground of the magnetic head and can easily adjust the position of the sliding surface of the magnetic head.

[0013]

According to the present invention, there is provided a magnetic head device in which a holding portion for holding a magnetic head and a mounting plate for mounting the magnetic head to a device are integrally formed by a conductive metal plate. Wherein the holding portion is bent from the mounting plate to form a frame, and the magnetic head is fitted and held in the frame-shaped holding portion.

For example, the conductive metal plate has a pair of frame pieces bent at right angles to the plate surface of the mounting plate.
This frame piece is further bent parallel to the mounting plate,
The frame portions are swaged together at the parallel portions to form the frame-shaped holding portion.

As described above, when the holding portion and the mounting plate are integrally formed by bending one metal plate, the holding portion and the mounting plate can be easily formed only by the pressing step. Further, when the frame-shaped holding portion is fixed by caulking, formation of the holding portion is easy.

In particular, it is preferable that the frame-shaped holding portion is elastically deformable, and the magnetic head is elastically held by the holding portion.

When the magnetic head is elastically held by the holding portion as described above, the magnetic head can be reliably positioned with respect to the holding portion, and the magnetic head and the holding portion can be securely contacted to ground the magnetic head. Can be surely secured.

However, the magnetic head may be bonded and fixed to the holding portion while being elastically held by the holding portion.

Further, a first magnetic head and a second magnetic head may be held side by side by the holding section.

Further, the second magnetic head has a smaller width dimension in the track width direction than the first magnetic head, and the holding portion has a smaller interval in the track width direction than the holding portion. A pair of bent holding pieces is formed, and both side faces of the second magnetic head in the track width direction are held by the holding pieces, so that the second magnetic head and the holding piece are attached to the first magnetic head. That can be inserted into the cassette half together with the magnetic head.

With the above arrangement, the second magnetic head such as an erase head having a small width can be reliably positioned and held on the holding portion. In addition, since the second magnetic head and the holding piece are accommodated within the width of the first magnetic head, the second magnetic head can be inserted into the cassette half while being held by the holding piece.

The holding portion is provided with a positioning portion extending toward the sliding surface side of the magnetic head and provided at intervals in the sliding direction of the recording medium.
It is preferable that the positions of the sliding surfaces of the two magnetic heads can be set with reference to the positioning portion.

For example, a tape guide is formed integrally with the holding section, and the leading end of the tape guide is the positioning section.

When the sliding surface of the magnetic head is positioned with reference to the tip of the holding portion, the structure of the jig for positioning the magnetic head can be simplified.

Further, in this case, the first holding part includes the first part.
A tape guide adjacent to the magnetic head is provided, and the sliding surface of the first magnetic head and the sliding surface of the second magnetic head are positioned with reference to the leading end of the tape guide and the leading end of the holding piece. It may be possible.

The holding section is provided with a tape guide adjacent to the first magnetic head, and the first magnetic head and the second magnetic head are held against the tape guide by the elasticity of the holding section. It is possible that

[0027]

1 to 3 are a plan view, a front view, and a side view, respectively, of a magnetic head device showing a first embodiment of the present invention.

In this embodiment, the mounting plate 11, the head holding portion 12, and the tape guide portion 13 are integrally formed by stamping a sheet of metal, which is a conductive leaf spring material, and performing sheet metal processing. I have.

When the metal plate is punched, band-shaped frame pieces 12a, 12a are formed integrally with the upper part of the mounting plate 11. The frame pieces 12a, 12a
The frame pieces 12a, 12a are bent at a right angle on the way, and a wedge-shaped convex portion and a wedge-shaped concave portion are integrally formed in a portion parallel to the mounting plate 11. By fitting the convex portion and the concave portion, a caulked portion 12b for connecting the frame piece 12a to the frame piece 12a is formed. The formation of the caulking portion 12b forms the frame-shaped head holding portion 12 having a square planar shape.

The tape guides 13, 13 are integrated with the head holder 12 on both sides of the head holder 12. As shown in FIG. 3, a tape guide groove 13a is formed in the tape guide portions 13, 13.

The magnetic head H1 is used for both recording and reproduction. The magnetic head H1 is a shield case whose surface is formed of a metal plate having a high magnetic permeability. A core is housed in the shield case, and a gap G1 formed at a joint portion of the core is a magnetic head H1. It appears in the window of the sliding surface H1a.

The magnetic head H1 includes a head holder 12
Is pressed into the frame from below, and is temporarily fixed to the head holding portion 12 by being fitted. In the present embodiment, after the magnetic head H1 is elastically held and positioned by the head holding unit 12, the resin is filled over the entire circumference or partially between the head holding unit 12 and the magnetic head H1. It is fixed by bonding.

Since the head holding portion 12 is formed of an elastic metal plate, the magnetic head H1 is
A plate portion facing the Y direction (tape guide portions 13, 13)
Is held between the plate portions (between the tape guide portion 13 and the tape guide portion 13) by the elastic deformation of the plate portion on which is formed. That is, the magnetic head H1 is positioned and held in the Y direction with reference to the plate surface on which the tape guide portion 13 is formed.

Therefore, by bending a frame piece for forming the head holding portion 12 at a right angle with respect to the mounting plate 11, the perpendicularity between the gap G1 of the magnetic head H1 and the mounting plate 11 can be reduced. The azimuth adjustment of the gap can be minimized when the magnetic head device is mounted on the apparatus main body.

Further, the magnetic head H1 is
Is slightly movable in the X direction, so that the magnetic head H
The head 1 is held by the head holder 12 in a state where the position 1 is adjusted in the X direction by a jig or the like. However, the magnetic head H1 may be elastically pressed and held not only in the Y direction but also in the X direction by the elastic deformation force of the head holding member 12. The magnetic head H1 is moved to X by the head holding unit 12.
When the elastic pressure is clamped in both the Y direction and the Y direction, the magnetic head H1 is simply fitted to the head holding portion 12 and the mounting plate 1
1, the magnetic gap G1 can be positioned with high accuracy in the X direction and the Y direction.

Further, since the shield case of the magnetic head H1 is elastically sandwiched between the frame-shaped head holders 12, the magnetic head H1 can be reliably grounded to the head holder 12. That is, as the structure of the magnetic head H1,
When the core provided inside is grounded to the shield case, the earth path of the core is securely connected to the head holding portion 12 via the shield case in a state where the magnetic head H1 is fitted to the head holding portion 12. Can be set.

The head holding portion 12 and the mounting plate 1
In the magnetic head device of the present invention, when the magnetic head H1 is fitted to the head holding portion 12, the magnetic head H1 and the mounting plate 11 are electrically connected. Will be connected. The mounting plate 11 is grounded by being conductively fixed to a head base such as a tape recorder.

In the present embodiment, the leading end 13b of the tape guides 13, 13 and the sliding surface H of the magnetic head H1 are used.
The mounting reference plane H1b, which is the top of 1a, is set to be the same height in the Z direction on the reference plane L1 shown in FIG. That is, in the embodiment shown in FIGS. 1 to 3,
Tip portions 13b, 13b of the tape guide portions 13, 13
Are positioning portions for positioning the magnetic head H1 in the Z direction.

The tape guides 13, 13 are located on both sides of the magnetic head H1 in the direction of travel of the magnetic tape when the magnetic head H1 is mounted on the head holder 12. Therefore, the tip portions 13b of the tape guide portions 13, 13
Is applied to the jig, so that the head holding portion 12
And the height of the reference mounting surface H1b of the magnetic head H1 can be set with reference to the jig.

For example, as shown in FIG. 7, the leading ends 13b, 13b of the tape guides 13, 13 are pressed against the flat surface of the jig 41 and positioned. In this state, the magnetic head H1 is inserted into the head holding unit 12, and the mounting reference surface H1b is simply pressed against the flat surface of the jig 41.
The magnetic head can be positioned.

Since the head holding part 12 and the mounting plate 11 are formed integrally, the head holding part 12 and the mounting plate 11
That is, it is possible to determine the relative positions with high accuracy. By making the tip portions 13b, 13b of the tape guide portions 13, 13 formed integrally with the head holding portion 12 and the mounting reference surface H1b of the magnetic head H1 the same, the mounting reference surface H1b of the magnetic head H1 is provided. And the relative position with respect to the mounting plate 11 can be determined with high accuracy.

FIG. 8 shows the tape guide portions 13 and 13.
Using the tip portions 13b, 13b of the
A method for positioning the magnetic head H1 at a position different from the mounting reference plane H1b in the Z direction is shown.

In the jig 42 used in this case, a raised portion is formed on the flat surface 42b, and the upper surface of the raised portion serves as a magnetic head positioning surface 42a. in this case,
The tip portions 13b, 13b of the tape guide portions 13, 13 are pressed against the flat surface 42b for positioning, and the magnetic head H
1 is inserted into the head holding portion 12, and the mounting reference surface H1b
Is pressed against the positioning surface 42a, the magnetic head H1 and the head holding unit 12 can be positioned.

In the process shown in FIG. 7 or FIG. 8, the magnetic head H1 is elastically held and positioned by the head holding unit 12. In this state, a resin is supplied between the magnetic head H <b> 1 and the head holding unit 12 to be bonded and fixed.

When the mounting reference surface of the magnetic head is set so as to protrude from the leading end of the tape guide, contrary to FIG. 8, positioning is performed in the opposite direction to the jig 42 shown in FIG. A jig whose reference surface 42a is lower than the flat surface 42b may be used.

When the magnetic head device assembled in this manner is mounted on a device such as a tape recorder, mounting screws are inserted into mounting holes 11a and grooves 11b of the mounting plate 11, and the head base such as the tape recorder is screwed. Stopped and fixed. At this time, the azimuth angle of the magnetic gap G1 of the magnetic head H1 can be adjusted by adjusting the amount of tightening of the screw inserted into the groove 11b and adjusting the bending degree of the mounting plate 11.

FIGS. 4 to 6 show a second embodiment of the present invention.
It is a top view and a rear view.

The second embodiment is a combined type head apparatus in which a recording and reproducing magnetic head H2 is mounted as a first magnetic head and an erasing head H3 is mounted as a second magnetic head.

Also in the present embodiment, the mounting plate 21 and the head holder 2 are made of a conductive metal plate having a spring property.
2 and the tape guide portion 23 are integrally formed.

As shown in FIG. 1 and subsequent figures, the frame pieces 22a, 22a are bent at right angles from the mounting plate 21, and further bent in parallel with the mounting plate 21 to form frame pieces 22a.
Are connected by wedge-shaped concave and convex fitting to form a swaged portion 22b. Then, a square frame-shaped head holding portion 22 is formed.

A tape guide 23 is integrally formed on one plate surface of the head holder 22 in the Y direction.
The tape guide section 23 has a guide groove 23a.

As shown in FIG. 6, a pressing piece 22c is formed by bending a tip of the plate surface of the head holding portion 22 on the side opposite to the side on which the tape guide portion 23 is formed. When the magnetic head H2 and the erasing head H3 are inserted into the frame-shaped head holder 22, the pressing piece 2
The erasing head H3 and the magnetic head H2 are pushed together in the Y direction by the elastic deformation force of 2c, and the tape guide portion 23
Pressed to. This pressing force causes the magnetic head H2
And the erasing head H3 are positioned in the Y direction with reference to the tape guide portion 23. Note that a plate piece that is not bent may be used as long as the pressing piece 22c has elasticity.

Since the magnetic head H2 and the erasing head H3 are elastically held by the head holder 22,
The magnetic head H2 and the erasing head H3 are
Is securely connected to ground. That is, the magnetic head H2
Is strongly pressed against the tape guide portion 23, so that the shield case of the magnetic head H2 and the tape guide portion 23 can be electrically and reliably conducted. Therefore, if the inner core and the shield case are grounded in the magnetic head H2, the core and the head holder 2 can be connected.
2 can be reliably grounded. As shown in FIG. 5, the erasing head H3 has a structure in which a core H3c forming two magnetic gaps and a resin mold body H3d are joined, but the pressing piece 22c is directly connected to the core H3c. The core H3c of the erasing head H3 is made
And the head holding portion 22 can be reliably grounded.

The tape guide 23 is attached to the mounting plate 2.
1, the azimuth angle of the magnetic gap G2 of the magnetic head H2 can be reduced
It can be set to a state close to a right angle to 1 and the adjustment of the azimuth angle when incorporated in a tape recorder or the like becomes easy.

As shown in FIGS. 4 and 5, in the head holding portion 22, the holding piece 2 bent inward in the X direction is formed at the portion where the erasing head H3 is inserted.
4 and 24 are integrally bent. Further, claws 24a, 24a serving as positioning portions of the erasing head H3 are formed at the distal ends of the holding pieces 24, 24 by bending.

As shown in FIGS. 4 and 5, the width of the erase head H3 in the track width direction (X direction) is smaller than the width of the magnetic head H2. Then, both side surfaces in the X direction of the erasing head H3 are elastically held by the holding pieces 24, 24.

As shown in FIG. 4, the holding pieces 24, 24
Is the width dimension W1 of the magnetic head H2.
Dimensions shorter than or slightly equivalent to 2. Therefore, when mounted on the tape recorder, the erasing head H3 and the holding pieces 24, 24 for holding the erasing head H3 become the magnetic head H2.
Together with the tape exposure window of the cassette half.

As shown in FIG. 6, the projecting position of the leading end portions 23b and 23b of the tape guide portion 23 in the Z direction is determined by the mounting reference surface H2 which is the top of the sliding surface H2a of the magnetic head H2.
The position of b in the Z direction is set so as to be located on the same reference plane L2. Similarly, the mounting reference surface H3b, which is the top of the sliding surface H3a of the erasing head H3, and the upper surfaces of the claws 24a, 24a at the tips of the holding pieces 24, 24 are on the same reference surface L3 in the Z direction. It is set to be located.

Although the reference plane L2 and the reference plane L3 may be at the same position in the Z direction, generally, the reference plane L2
However, it slightly protrudes in a direction away from the mounting plate 21 beyond the reference plane L3.

In the assembly work of the magnetic head device shown in FIG. 4, a jig 43 shown in FIG. 9 is used. In this jig 43, two positioning surfaces 43a and 43b are formed via steps.

In the head holding section 22, a tape guide section 23 and a holding piece 24 formed at intervals in the running direction (Y direction) of the recording medium function as a positioning section.
As shown in FIG. 9, the distal end portion 23b of the tape guide portion 23
Is pressed against the positioning surface 43a of the jig 43, and the claws 24a, 24a at the tips of the holding pieces 24, 24 are pressed against the positioning surface 43b of the jig 43.

Then, the magnetic head H2 and the erasing head H3 are inserted into the head holding portion 22, and the respective mounting reference surfaces H2b and H3b are respectively aligned with the positioning surfaces 43a.
43b, and the magnetic head H2, the erasing head H3, and the head holder 22 are positioned.

As described above, the erasing head H3 is positioned between the holding pieces 24, 24 in the X direction. However, since the magnetic head H2 has a margin in the X direction in the head holding portion 22, the magnetic head H2 has a magnetic head. The head H2 is finely adjusted in the X direction.
In this state, the magnetic head H2 and the erasing head H3 are sandwiched and positioned between the tape guide portion 23 and the pressing piece 22c. Note that the magnetic head H2 may be elastically held by the head holder 22 from both sides in the X direction. With this configuration, by inserting the magnetic head H2 and the erasing head H3 into the head holding unit 22, the magnetic head H2 is positioned and held in the X direction by the head holding unit 22, and the erasing head H3 is also held by the holding piece 2.
4 and 24, are positioned and held in the X direction. Then, both heads H2 and H3 are positioned in the Y direction by the pressing piece 22c.

In the state where the magnetic head H2 and the erasing head H3 are positioned as described above, the process can be shifted to the resin bonding step without moving the position of each magnetic head. In this bonding step, the resin is entirely or partially filled between the magnetic head H2, the erasing head H3, and the head holding portion 22.

Also in this embodiment, the tip 23a of the tape guide 23 and the mounting reference surface H2b of the magnetic head H2 are not at the same position in the Z direction, and the mounting reference surface H3b of the erase H3 and the claws 24a, 24a. When is not the same plane, positioning can be performed by using a jig having a step as shown in FIG.

[0066]

As described above, according to the present invention, since the head holding portion and the mounting plate are formed of a single conductive leaf spring material, the magnetic head device can be constructed with a minimum number of components.

Further, when the magnetic head is fitted to the head holding portion having the frame structure, the magnetic head can be positioned and the magnetic head and the mounting plate are electrically connected. The ground of the magnetic head can be taken.

Further, the sliding surface of the magnetic head can be positioned by using a jig by using the tape guide portion and the holding piece provided on the holding portion as the positioning portion, and the magnetic head can be elastically held in the completed position. Therefore, in this state, the assembly can be completed by fixing with an adhesive such as a resin.

Even if the widths of the two magnetic heads are different, both heads can be held by forming the holding pieces.

[Brief description of the drawings]

FIG. 1 is a plan view showing a magnetic head device according to a first embodiment of the present invention.

FIG. 2 is a front view showing the magnetic head device according to the first embodiment of the present invention;

FIG. 3 is a side view showing the magnetic head device according to the first embodiment of the present invention;

FIG. 4 is a perspective view showing a magnetic head device according to a second embodiment of the present invention;

FIG. 5 is a plan view showing a magnetic head device according to a second embodiment of the present invention.

FIG. 6 is a rear view showing a magnetic head device according to a second embodiment of the present invention;

FIG. 7 is an exemplary front view showing a state where the magnetic head is positioned in the height direction in the magnetic head device according to the first embodiment of the present invention;

FIG. 8 is an exemplary front view showing a modification of the magnetic head device according to the first embodiment of the present invention in which the magnetic head is positioned in the height direction;

FIG. 9 is an exemplary front view showing a state where the magnetic head is positioned in the height direction in the magnetic head device according to the second embodiment of the present invention;

FIG. 10 is a perspective view of a conventional magnetic head device.

[Explanation of symbols]

 11, 21 Mounting plate 12, 22 Head holding part 12a, 22a Frame piece 12b, 22b Caulking part 13, 23 Tape guide part 13a, 23a Guide groove 13b, 23b Tip part 24, 24 Holding piece H1, H2 Magnetic head H3 Erase head H1a, H2a, H3a Sliding surface H1b, H2b, H3b Mounting reference surface 41, 42, 43 Jig

Claims (10)

[Claims] 1. A magnetic head device in which a holding portion for holding a magnetic head and a mounting plate for mounting the magnetic head to a device are integrally formed by a conductive metal plate. A magnetic head device which is bent from a mounting plate to be formed in a frame shape, and wherein the magnetic head is fitted and held in the frame-shaped holding portion. 2. The conductive metal plate has a pair of frame pieces bent at right angles to the plate surface of the mounting plate, and the frame pieces are further bent in parallel with the mounting plate, and 2. The magnetic head device according to claim 1, wherein the frame pieces are caulked at each other to form the frame-shaped holding portion. 3. The magnetic head device according to claim 1, wherein the frame-shaped holding portion is elastically deformable, and the magnetic head is elastically held by the holding portion. 4. The magnetic head device according to claim 3, wherein the magnetic head is bonded and fixed to the holding portion while being elastically held by the holding portion. 5. The magnetic head device according to claim 1, wherein a first magnetic head and a second magnetic head are held side by side on the holding unit. 6. The second magnetic head has a smaller width dimension in the track width direction than the first magnetic head, and the holding section has a smaller interval in the track width direction than the holding section. A pair of bent holding pieces is formed, and both side faces of the second magnetic head in the track width direction are held by the holding pieces, so that the second magnetic head and the holding piece are attached to the first magnetic head. 6. A magnetic head device according to claim 5, wherein said magnetic head device can be inserted into a cassette half together with said magnetic head. 7. A positioning portion extending toward the sliding surface side of the magnetic head and provided at intervals in the sliding direction of the recording medium, is projected from the holding portion, and the one or two positioning portions are provided. 7. The magnetic head device according to claim 1, wherein the position of the sliding surface of the magnetic head can be set with reference to the positioning portion. 8. The magnetic head device according to claim 7, wherein a tape guide is formed integrally with the holding portion, and a tip of the tape guide is the positioning portion. 9. A tape guide adjacent to the first magnetic head is provided in the holding section, and the first magnetic head slides on the basis of the tip of the tape guide and the tip of the holding piece. 7. The magnetic head device according to claim 6, wherein the surface and the sliding surface of the second magnetic head can be positioned. 10. A tape guide adjacent to the first magnetic head is provided in the holding section, and the first magnetic head and the second magnetic head are pressed and held against the tape guide by the elasticity of the holding section. The magnetic head device according to claim 6, wherein: