JP2529277B2 - Magnetic head device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device particularly useful for a floppy disk drive device.

2. Description of the Related Art In general, a magnetic head device for a floppy disk drive device is a front core in which a core having a recording / reproducing gap and a core having an erasing gap for tunnel erase are integrated. The front core is attached to a support frame called a slider, and the support frame is attached to a gimbal or the like. Hereinafter, an example of the magnetic head device configured as described above will be described with reference to the drawings.

In FIGS. 4 and 5, 25 is a front core, 26 and 27 are sliders that sandwich and hold the front core 25, and 28.
Is a gimbal that holds the sliders 26 and 27. 29 is a recording / reproducing coil, 30 is a coil bobbin, 31 is a back core attached to the rear end of the front core, and 32 is a back core 30.
It is a U-shaped pressure spring for fixing the.

Problems to be Solved by the Invention However, with the above configuration, the sliders 26, 2
Since 7 has a slightly complicated shape, it is very difficult to process, and the joint area between the sliders 26, 27 and the front core 25 becomes very small, so that the joint strength decreases. A recording / reproducing coil and an erasing coil (not shown)
Has a structure in which a bobbin 30 made of synthetic resin is wound in advance and is fitted to the rod-shaped part at the rear of the front core 25. Had increased.

The present invention has been made in view of the above problems,
An object of the present invention is to provide a magnetic head device capable of maintaining a strong strength with a simple structure, the number of parts can be suppressed to a small number, processing is not troublesome.

Means for Solving the Problems In order to solve the above problems, the present invention has a front core having a recording / reproducing gap and an erasing gap, and three rear end portions, and a rear end portion thereof is inserted. A tubular body having a through hole and a central hole communicating with the through hole,
The recording / reproducing coil and the erasing coil provided on the tubular body, the back core inserted into the central hole, and the dummy core held by the tubular body are provided, and the recording / reproducing coil and the aforesaid coil are provided between the rear ends. The rear end portions are inserted into the through holes so that the erasing coils are arranged, and the rear end portion and the back core are in contact with each other at the central hole.

Operation With the above structure, if the tubular body is fixed to the holding member such as a gimbal, the front core and the back core are fixed to the gimbal via the tubular body. That is, the tubular body functions as a holding member that holds the front core and the back core. On the other hand, since the coil wound around the tubular body surrounds the rod-shaped back core, the tubular body also serves as a bobbin for writing the recording / reproducing coil and the erasing coil.

Example Hereinafter, a magnetic head device according to an example of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a base body that also serves as a coil bobbin and a front core holding member,
A synthetic resin is used as the material. Reference numeral 2 is a recording / reproducing coil wound around one end of the substrate 1, and 3 is an erasing coil wound around the other end. Reference numeral 4 denotes a central through hole that penetrates substantially the center of the base 1. Reference numerals 5, 6 and 7 are through holes for housing the front core 8. The through holes 5 and 7 are provided at both ends of the base body 1, and the through hole 6 is provided between the recording / reproducing coil 2 and the erasing coil 3 respectively. Are pierced). The through holes 5, 6, 7 intersect with the central through hole 4 in the central portion.
On the other hand, 9,10,11 are through holes for housing the dummy core 12,
Similar to the through holes 5, 6, 7, it penetrates from one side surface to the other side surface. The central through hole 4 is not formed in the center of the substrate 1, but is offset to some extent toward the through holes 5, 6, 7. Therefore, the central through hole 4 is defined by the through holes 5, 6, 7
However, it does not intersect with the through holes 9, 10, 11.

In the front core 8, 13 is a recording / reproducing I-type core, 14 is a recording / reproducing L-type core, the I-type core 13 and the L-type core 14 are joined by glass welding, and the joining portion is recorded. -The reproduction gap 15 is formed. on the other hand,
Reference numeral 16 is an erasing I-shaped core, and 17 is an erasing L-shaped core, which are joined by glass welding similarly to the recording / reproducing core, and an erasing gap 18 is formed at the joining portion. Then, the I-type core 13 and the I-type core 16 are joined via a spacer.

On the other hand, the dummy core 12 is processed into substantially the same shape as the front core 8, and as the material thereof, ceramic or the like having substantially the same hardness as the front core 8 is used.

The front core 8 and the dummy core 12 are fitted to the base body 1 as shown in FIG. 1 after the winding of the coils 2 and 3 is completed, and are fixed by an adhesive of synthetic resin. The back core 19 and the leaf spring 20 are inserted into the central through hole 4. The back core 19 inserted into the central through hole 4 is pressed against the L-shaped cores 14 and 17 and the I-shaped cores 13 and 16 of the front core 8 internally by the repulsive force of the leaf spring 20 and has a good magnetic contact. Will be obtained. The back core 19 is also fixed by the synthetic resin adhesive.

2 and 3 show a state in which the front core 8, the dummy core 12, and the back core 19 have been attached. The media sliding surfaces 21 and 22 of the front core 8 and the dummy core 12 respectively project from the base 1 by the same height. The sides of the coils 2 and 3 are covered with silicon rubber or the like to protect them from damage. After that, the media sliding surface is further polished and processed so that the height from the lower end surface 23 of the base 1 to the media sliding surfaces 21 and 22 becomes a specified dimension.

As described above, according to the present invention, the front core having the recording / reproducing gap and the erasing gap and having the three rear end portions, the through hole into which the rear end portion is inserted, and the through hole are connected. A cylindrical body having a central hole, a recording / reproducing coil and an erasing coil provided in the cylindrical body, a back core inserted into the central hole, and a dummy core held in the cylindrical body, The rear end portions are inserted into the through holes so that the recording / reproducing coil and the erasing coil are arranged between the rear end portions, and the rear end portion and the back core are in contact with each other in the central hole. With this configuration, the tubular body shares the front core holding member and the coil bobbin of the recording / reproducing and erasing coil, and the front core has the rod-shaped rear end portion of the tubular body. Firmly fixed to Therefore, the structure can be made very simple with a simple structure and a small number of parts. Further, by providing the dummy core, the slidability with respect to the medium is improved, and damage to the medium and the front core can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a magnetic head device according to an embodiment of the present invention, FIG. 2 is a perspective view of the magnetic head device, and FIG. 3 is a reverse perspective view of the magnetic head device. FIG. 4 is a perspective view of a conventional magnetic head device, and FIG. 5 is a side view of the same magnetic head device. 1 ... Base, 2, 3 ... Coil, 4 ... Central through hole, 5, 6, 7
...... Through hole, 8 ...... Front core, 12 …… Dummy core,
19 ... Backcore

Claims (1)

(57) [Claims] 1. A front core having a recording / reproducing gap and an erasing gap, a media contact portion, and at least three rear end portions projecting rearward from the media contact portion, and the rear end portion, respectively. A cylindrical body having a through hole to be inserted and a central hole communicating with the through hole, a recording / reproducing coil and an erasing coil provided in the cylindrical body so as to surround the central hole, and the center. The recording / reproducing coil and the dummy core held in the tubular body, the back core being inserted into the hole and arranged in the recording / reproducing coil and the erasing coil, and the dummy coil being held by the tubular body. The rear end portion is inserted into the through hole so that the erasing coil is arranged, and the rear end portion and the back core are in contact with each other in the central hole. Magnetic head device that.