JPH04351703A - Magnetic head device - Google Patents

Abstract

PURPOSE:To surely magnetically and mechanically couple a front core and a back core and to perform automatic assembling. CONSTITUTION:In a magnetic head device where a front core 1 and a back core 2 are put one over the other and are magnetically and mechanically coupled by pressing and supporting by a core retainer 5, a connecting member 28 is mechanically reinforced which connects core retaining pieces 26 and 27 which are inserted to coil bobbins 3 and 4 together with side core parts 11 and 12 of the front core 1 and side leg parts 18 and 19 of the back core 2.

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 suitable for writing or reading information signals on, for example, a floppy disk.

0002

BACKGROUND OF THE INVENTION Conventionally, a magnetic head device for recording and reproducing information signals on a floppy disk, etc. has, for example, a front core in which a magnetic gap for recording and reproducing and a magnetic gap for erasing are formed, and a front core coupled to the front core. A magnetic head element is proposed in which a pair of sliders sandwich a magnetic head element whose magnetic circuit section is made up of a back core that is approximately E-shaped in plan and forms a closed magnetic path, and a coil bobbin around which a drive coil is wound. has been done.

In the magnetic head device, the front core and the back core are stacked on top of each other in a so-called stacked state within the coil bobbin, thereby achieving magnetic coupling. Therefore, in this type of magnetic head, it is extremely important to bring the front core and back core into close contact with each other without any gaps in order to improve the electromagnetic conversion characteristics. In other words, if there is even a slight gap between the front core and the back core, this gap acts as a gap (back gap), leading to a decrease in output during recording and reproduction and a decrease in erasure rate.

As a means for fixing the front core and the back core, hitherto, for example, a pair of metal plate springs bent into a dogleg shape so as to be elastically deformable are inserted into each coil bobbin. A means for bringing the front core and back core into close contact with each other using the elastic force of the metal plate spring, a means for sandwiching the front core and the back core by a metal plate spring bent to have a substantially U-shaped cross section, and a protrusion are provided. A method has been proposed in which a core holder made of a plastic molded product is inserted into a coil bobbin and the core holder is bent to bring the front core and back core into close contact with each other.

[0005] In the method of inserting the pair of bent metal plate springs into the coil bobbin, it is necessary to press-fit the metal plate springs into a minute gap between the back core to be fitted into the coil bobbin and the coil bobbin. There is. For this reason,
Inserting a metal plate spring into a coil bobbin is extremely difficult and must be done manually. Furthermore, since the metal plate spring itself is very small, it is not easy to handle it.

On the other hand, with the method of sandwiching the front core and back core with a metal plate spring, the part where the front core and back core are brought into close contact is limited to the part that protrudes from the coil bobbin, so the front core and back core cannot be brought into close contact with each other. It is difficult to do so. As a result, the bonding area between the front core and the back core becomes insufficient, resulting in an unstable magnetic path, which impedes electromagnetic conversion characteristics.

[0007] Furthermore, when using a core holder made of a plastic molded product, unless the core thickness of the front core and back core within the coil bobbin is improved and kept constant, the front core and back core may The pressing force changes.

[0008]

[Problems to be Solved by the Invention] The present invention has been proposed in view of the above-mentioned conventional circumstances, and it is capable of magnetically and mechanically securely fixing the front core and back core, and of automatically assembling the front core and the back core. The object of the present invention is to provide a highly productive magnetic head device that can be used in a variety of applications.

[0009]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the magnetic head device of the present invention has a front core formed by a pair of side core parts abutting each other on both sides of a center core part with gap materials interposed therebetween. , a back core having a center leg portion and a side leg portion respectively facing the center core portion and side core portions of the front core; and a side core portion of the front core and side leg portions of the back core each having a coil wound around its circumferential surface. A pair of coil bobbins are fitted and arranged so that they overlap, a pair of core holding pieces are inserted into the coil bobbin together with the side core portion and side leg portions, and press and support these side core portions and side leg portions, and these core holding pieces are connected. and a core holder having a connecting member, and the connecting member of the core holder is mechanically reinforced.

0010

[Operation] In the magnetic head device according to the present invention, a pair of core holding pieces that press and support a side core portion and a side leg portion that are fitted into a coil bobbin are connected by a connecting member, and the core holding pieces are connected. Since the connecting member is mechanically reinforced, even if the connecting member is pushed and the core presser piece is press-fitted into the coil bobbin, the connecting portion will not be deformed or bent. Further, in the present invention, since the core holding pieces are connected by the connecting member, handling is improved, and automation of the work of inserting the core holding piece into the coil bobbin can be expected.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described below with reference to the drawings. Note that in this example,
This is an example in which the present invention is applied to a magnetic head device for a floppy disk that records and reproduces information signals on a floppy disk. As shown in FIGS. 1 and 2, the magnetic head device of this embodiment includes a magnetic head element consisting of a front core 1, a back core 2, a pair of coil bobbins 3 and 4 around which drive coils are wound, and these front cores. 1. It consists of a core holder 5 for magnetically coupling the back core 2, and a pair of sliders 6 and 7 for ensuring contact with the floppy disk.

[0012] The front core 1 has a pair of rod-shaped center core parts 9 and 10 joined together via a non-magnetic material 8 to prevent magnetic interference, and a substantially L-shaped center core part 9 and 10 are formed on both sides of the center core parts 9 and 10 through gap materials, respectively. The side core portions 11 and 12 are butted against each other, and a first magnetic gap and a second magnetic gap (both not shown) are formed on the abutting surfaces, respectively. This first magnetic gap is
The second magnetic gap operates as a recording/reproducing magnetic gap, and the second magnetic gap operates as an erasing magnetic gap.

On the other hand, the back core 2 includes a pair of core members 13 formed to correspond to the core shape of the front core 1.
, 14 are joined on the side surfaces via a non-magnetic material 15. The core members 13 and 14 are
It has center leg parts 16, 17 and side leg parts 18, 19 at positions facing the center core parts 9, 10 and side core parts 11, 12 of the front core 1, respectively,
They are connected by connecting members 20 and 21 and have a substantially U-shaped planar shape. Therefore, the center legs 16, 17
By providing the side legs 18 and 19, it is possible to secure a bonding area between the cores that increases the length of the front core 1 in the depth direction, and it is possible to improve the electromagnetic conversion characteristics.

The coil bobbins 3 and 4 are manufactured by insert molding into external terminals 22 and 23 formed by punching a hoop material. A single drive coil 24 is wound a predetermined number of times around the circumferential surface of a body portion having a rectangular cross section in the coil bobbin 3 into which the side core portion 11 of the front core 1 on the side where the erasing magnetic gap is formed is inserted. The beginning and end of the winding are respectively wound around the external terminal 22. On the other hand, a predetermined number of two drive coils 25 are wound around the coil bobbin 4 into which the side core portion 12 of the front core 1 on the side where the recording/reproducing magnetic gap is formed is inserted. (common)
are wound around three external terminals 25, respectively. The coil bobbins 3 and 4 have receiving portions 3a and 4a that serve as supports for projections (pivots) that are head pressing members of a magnetic head support mechanism (not shown) provided on the back side of the magnetic head element. is formed protrudingly.

[0015] The front core 1 and the back core 2 are connected to the through holes 3 provided in the coil bobbins 3 and 4.
side core parts 11, 12 of the front core 1 within b, 4b
and the side legs 18 and 19 of the back core 2 are brought into contact with each other and overlapped in a so-called stacked state. That is, one side 11a of the side core portion 11 and one side 1 of the side leg portion 18.
8a to achieve magnetic coupling, and one side surface 12a of side core portion 12 and one side surface 21a of side leg portion 21 to establish magnetic coupling, thereby forming a closed magnetic path. Therefore, these front core 1, back core 2, and coil bobbins 3 and 4 form a magnetic head element having a first magnetic gap that operates as a magnetic gap for recording and reproduction, that is, a recording and reproduction head, and a magnetic gap that operates as a magnetic gap for erasing. A magnetic head element, that is, an erase head is constructed having a second magnetic gap.

Furthermore, the through holes 3 of the coil bobbins 3 and 4
A core holder 5 for magnetically coupling the front core 1 and back core 2 is inserted in b and 4b. The core presser 5 is formed by bending a resilient metal plate, and includes the side core parts 11 and 12 of the front core 1 and the side leg parts 18 and 1 of the back core 2.
It has core holding pieces 26, 27 which are inserted into the coil bobbins 3, 4 together with the coil bobbins 9, and a connecting member 28 which connects these pieces.

The core holding pieces 26 and 27 are provided so as to hang down in the direction of the front core 1 from both ends of the connecting member 28 in the longitudinal direction, and are provided integrally with the connecting member 28. The tip sides of the core holding pieces 26, 27 are bent into a dogleg shape, and the bent portions 26a,
The back core 2 is pressed against the front core 1 by the elastic force of 27a. On the other hand, the connecting member 28 has a portion protruding from the coil bobbins 3 and 4 that is bent toward the side opposite to the back core 2, so that the mechanical strength of this portion is increased and reinforced. In other words, in the connecting part that connects the core holding pieces 26 and 27, one side edge of the connecting member 28 that protrudes from the coil bobbins 3 and 4 is bent into a substantially L shape on the opposite side from the back core 2, so that the plate thickness is reduced. The mechanical strength is twice as high as that of other parts.

The core presser 5 formed as described above is
As shown in FIG. 3, the through holes 3b of the coil bobbins 3, 4,
4b, the tips of the core holding pieces 26 and 27 are connected to the through hole 3.
b, 4b, the bent portions 26a, 27a contact the back core 2, and the unbent portions of the connecting member 28 contact the outer peripheral edges of the through holes 3b, 4b and are bent, and the back core The side leg portions 18 and 19 of No. 2 are pressed and supported by the side core portions 11 and 12 of the front core 1. As a result, the side core parts 11 and 12 and the side leg parts 18 and 19 are supported by pressure, and these side core parts 11 and 19 are supported by pressure.
, 12 and the side legs 18, 19 are ensured magnetically and mechanically. Therefore, the front core 1
There is no gap between the back core 2 and the back core 2, and the gap does not operate as a back gap when the magnetic head is driven.

The magnetic head element having the above structure has a pair of sliders 6 and 7 attached to the side where the recording/reproducing magnetic gap and the erasing magnetic gap are provided to ensure contact characteristics with the floppy disk. There is. One slider 6 of the pair of sliders 6 and 7
Core reinforcing legs 29, 30, 3 contact the center core parts 9, 10 and each side core part 11, 12 of the front core 1, respectively, and reinforce the mechanical strength of these core parts.
1. Note that this core reinforcing leg portions 29, 30,
31 is inserted into the coil bobbins 3 and 4 together with the side core parts 11 and 12. On the other hand, the other slider 7 is provided with a gimbal (
Illustration is omitted. ) for joining leg part 3 for joining with
2, 33, and 34.

As mentioned above, the pair of sliders 6,
The magnetic head element sandwiched by 7 is fitted into a magnetic shield member 35 formed as a planar rectangular frame, and mounted on a gimbal to which a printed wiring board is attached. The magnetic shield member 35 is formed in a size large enough to house the magnetic head element sandwiched between the pair of sliders 6 and 7, and fits around the outer periphery of the sliders 6 and 7. It is set up like this.

By the way, in order to manufacture the magnetic head device constructed as described above, first, a pair of sliders 6 and 7 are attached to both sides of the front core, and then each side core portion 11 and 12 of the front core 1 is attached. Fit the coil bobbins 3 and 4 to the coil bobbins 3 and 4. Next, the through holes 3b of the coil bobbins 3 and 4
, 4b, the side legs 18, 19 of the back core 2 are exposed, and the side legs 18, 19 and the side core parts 11, 1
Contact with 2. Next, the core presser pieces 26 and 27 of the core presser 5 are press-fitted into the through holes 3b and 4b of the coil bobbins 3 and 4, respectively.

At this time, in the core holder 5,
Since the connecting member 28 that connects the core holding pieces 26 and 27 is mechanically reinforced, by holding the connecting member 28 and pushing it in, each of the core holding pieces 26 and 27 can be securely connected.
27 can be press-fitted into the empty spaces of the coil bobbins 3 and 4. For example, if the connecting member 28 of the core presser 5 is a single plate that is not bent, if you hold the connecting member 28 and push it in, the connecting member 28 will break due to its weak mechanical strength. The core pressing pieces 26, 27 cannot be reliably press-fitted because of the deformation. Further, when the core holding pieces 26 and 27 are pushed in separately, the back core 2 tends to tilt, and the pushed-in portion is deformed. However, the core presser 5 according to this embodiment
Since the connecting member 28 is mechanically reinforced, it will not be deformed even if the connecting member 28 is held and pushed. Therefore, the core presser 5 can be press-fitted while holding the connecting portion. This will enable automatic assembly using labor-saving equipment such as robots, and can be expected to significantly improve productivity. Furthermore, since the core presser pieces 26 and 27 are connected by the connecting member 28, handling of the core presser 5 becomes extremely easy.

As a result of the above, the front core 1 and the back core 2 are reliably coupled magnetically and mechanically by the core presser 5. Finally, the magnetic head device is completed by fitting the magnetic shield member 35 around the outer periphery of the pair of sliders 6 and 7.

Although one embodiment of the magnetic head device to which the present invention is applied has been described above, the present invention is not limited to the above-described embodiment and can be modified in various ways. for example,
In the above-mentioned embodiment, one side edge of the connecting member 28 of the core presser 5 was bent to the side opposite to the back core 2, but as shown in FIG. Even if it is bent to the second side, the same effect can be obtained. In addition, as shown in FIG.
Similar effects can be obtained by increasing the thickness of the connecting portion 36 that connects the parts 6 and 27. Note that in the above example,
Although the present invention has been applied to a magnetic head for a floppy disk, the present invention can be applied to all types of magnetic heads in which a front core and a back core are overlapped and coupled magnetically and mechanically, and the present invention can be applied to any type of magnetic head in which a front core and a back core are overlapped and coupled magnetically and mechanically. The same effects as in the example can be expected.

[0025]

As is clear from the above description, according to the present invention, the core holding pieces inserted into the coil bobbin together with the side core portion and the side leg portions are connected by a connecting member, and the mechanical strength of the connecting member is Since the strength is reinforced, even if the connecting member is held and pushed in, the connecting part will not be deformed, and the magnetic and mechanical connection between the side core part and the side leg part will be ensured. be able to. Therefore, a significant improvement in electromagnetic conversion characteristics can be expected.
Good recording and playback can be performed.

Furthermore, in manufacturing the magnetic head device of the present invention, since the strength of the core holder is high and it is easy to handle, automatic assembly by a robot or the like is possible, and productivity can be greatly improved. .

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an example of a magnetic head to which the present invention is applied.

FIG. 2 is a perspective view of the assembled magnetic head.

FIG. 3 is a cross-sectional view of the magnetic head of FIG. 2;

FIG. 4 is a perspective view showing another example of a core presser to which the present invention is applied.

FIG. 5 is a perspective view showing still another example of a core presser to which the present invention is applied.

[Explanation of symbols]

1...Front core 2...Back core 3, 4...Coil bobbin 5... Core holding 26, 27... Core holding piece 28...Connection member

Claims (1)

[Claims] 1. A front core comprising a pair of side core parts abutted against each other on both sides of a center core part through gap materials, and a center leg part and side legs facing the center core part and side core part of the front core, respectively. a pair of coil bobbins having coils wound around their circumferential surfaces and fitted so that the side core portions of the front core and the side leg portions of the back core overlap, respectively; and the side core portion and the side leg portions. and a core presser having a pair of core presser pieces that are inserted into the coil bobbin and press and support these side core parts and side leg parts, and a connecting member that connects these core presser pieces, and the connecting member of the core presser is connected to the machine. A magnetic head device characterized by being reinforced.