JPH0333928Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention penetrates the back core into the winding frame of the coil,
By providing an open part in the winding frame, the winding frame and the back core are fixed using the winding of the coil, and the winding frame is used as an assembly member, so that assembly is easy, the winding frame space is expanded, and the characteristics are uniform. The present invention relates to a recording/reproducing magnetic head used in a magnetic recording/reproducing device for digital signals.

[Conventional technology]

As a recording/reproducing head for a floppy disk, there is a tunnel erase type magnetic head in which an erasing head is provided with an erasing magnetic gap in the same direction as the magnetic gap on both sides of the core of the recording/reproducing head, and a recording/reproducing head. A straddle erase type magnetic head in which erase head cores are arranged at a fixed interval on both sides of a read head, and erase is performed by a leakage magnetic field generated between the erase head core and the recording/playback head core. There is. By magnetically trimming and eliminating distortions or disturbances on both sides of the recorded signal in any magnetic head, the signal-to-noise ratio caused by misalignment of the magnetic head's tracks is improved. As shown in FIG. 1, a conventional straddle erase type magnetic head has two magnetic cores 1 and 2 made of soft magnetic material butted against each other to form a magnetic gap, and the magnetic core 2 is connected to a winding frame 13 by winding the head. The magnetic head is inserted into the prepared recording/reproducing head coil 4, and the back core 3 connects the magnetic cores 1 and 2 to form a closed magnetic path to form a recording/reproducing magnetic head. The erase head core members 5, 5' form an erase magnetic gap with the magnetic cores 1, 2, and the erase head core members 5, 5' form an erase magnetic gap with the magnetic cores 1, 2.
A magnetic yoke 6 having bent portions 8 and 8' inserted through the erase head coil 7 is magnetically coupled to the erase head 5' to form an erase head. That is, as shown in FIG. 2, these cores form a magnetic gap 14 by abutting two magnetic cores 1 and 2 made of soft magnetic material, and erase head cores are placed on both sides of these magnetic cores 1 and 2. An erase magnetic gap 15 is formed between the magnetic cores 1, 2 and the erase head core members 5, 5' by sandwiching a non-magnetic slider 9 that holds the members 5, 5'. However, in magnetic heads with conventional structures, especially magnetic heads for recording and reproducing, when the two ends of the back core 3 are placed between the magnetic cores 1 and 2 and brought into close contact with each other as shown in FIG. 1, these cores may be damaged. It has the disadvantage that a complicated jig is required to join the joint without any problem and to maintain the correct position, resulting in extremely poor workability. Therefore, the inventors of the present invention filed the application No. 144 in 1981.
No. 926, in order to eliminate the above-mentioned drawbacks, in a magnetic head for recording and reproducing, in which the tips of two magnetic cores made of two soft magnetic materials are butted against each other to form a magnetic gap, there is a magnetic head that is located outside the flanges at both ends of the reel. A prismatic insulating pawl with a length equal to the thickness of the magnetic core protrudes in the direction of In addition, a magnetic head is provided in which a magnetic core is clamped and fixed between each pawl and a back core.

[Problem that the idea aims to solve]

However, the present inventors discovered that if the entire part where the coil is wound is covered with a winding frame made of an insulating material, the winding frame space becomes narrower, and the back core becomes stuck between the winding frame and the back core. I noticed that there was an inconvenience caused by rattling inside. The present invention has been devised in view of the above points, and its purpose is to provide a magnetic head that is easy to assemble, improves workability, and has an expanded winding space.

[Means to solve the problem]

According to the present invention, for recording and reproducing, a closed magnetic path is formed by two magnetic cores made of soft magnetic material and whose tips abut against each other to form a magnetic gap, and a back core that contacts the rear end of the magnetic core at both ends. In the magnetic head, prismatic claws made of an insulating material and having a length equal to the thickness of the magnetic core are formed in the outer direction on the flanges at both ends of the winding frame around which the coil is wound, and At least one of the four sides of the part of the winding frame around which the coil is wound is open, and the width of the part of the winding frame around which the coil is wound is narrower than the width of the back core; The back core penetrates the winding frame, and a portion of the winding frame around which the coil is wound is insulated by an insulating sheet material and is wound by the coil in order to fix the back core. ,
A magnetic head is obtained in which the magnetic core is clamped and fixed between the pawl and the back core.

[Effect]

According to the above structure, since the back core is held by the winding frame, assembly is easy and workability is improved. In addition, by providing an open surface on the winding frame, the winding can be easily done between the winding frame and the back core, which is wider than the winding frame, which prevents the back core from moving or swinging, and also reduces the winding space. Expanding.

【Example】

Hereinafter, the present invention will be explained with reference to the drawings. In the embodiment of the winding frame used in the magnetic head of the present invention, as shown in FIG. A prismatic core-holding pawl 11 protruding in the direction shown in FIG. Further, the core holding pawl 11 is provided with a protrusion 12 that protrudes inward. Further, open surfaces 17 and 17' are provided in the part of the winding frame 13 where the coil is wound (winding part) for the purpose of enlarging the winding space and fixing the winding frame 13 and the back core. There is. When using the winding frame 13 according to the present invention, the back core 3 is inserted into the winding frame 13 as shown in FIG. Apply a line. FIG. 5 shows an embodiment in which a coil 4 wound around a winding frame 13 of the present invention is incorporated into an actual magnetic head. As described above, the back core 3 is inserted into the winding frame 13, the winding part is insulated with the insulating sheet material 18, and the coil 4 is formed by winding. A spacing approximately equal to the thickness of 1 or 2 is maintained. When the already assembled magnetic cores 1 and 2 are inserted into the gap between the ends created here, the protrusion 12 of the pawl 11 sandwiches and fixes the magnetic cores 1 and 2 with the back core 3. Therefore, the winding frame 13 used in the magnetic head of the present invention allows the back core 3 and the magnetic cores 1 and 2 to be brought into close contact and fixed by the claws 11. Further, when the back core 3 is in the normal position, the lower end of the stretching collar 10 comes into contact with the upper surface of the already assembled slider 9, so that the position of the back core 3 is naturally regulated. Therefore, the magnetic head using this winding frame 13 has a larger space for winding.
The magnetic head itself can be made smaller, and the back core 3
is fixed to the winding frame 13, so that the magnetic core 1
This provides a magnetic head that is always fixed in the correct position, can be easily assembled without damaging the cores, and has excellent workability.

[Effects of the invention] As described above, according to the invention, by opening at least one of the four winding surfaces of the winding frame, the winding frame and the back core are fixed, and the back core can swing and move. In addition, the winding space is expanded, and by providing claws on the flanges at both ends of the winding frame, the back core can be reliably brought into close contact with the magnetic core for recording and reproducing, which improves magnetic efficiency. Good workability and improved reliability. In the above description, a recording/reproducing magnetic head has been described, but the method of using the reel of the present invention can also be applied to an erasing head, and can also be used for a straddle erase type magnetic head.

[Brief explanation of drawings]

Figure 1 is an external perspective view of a conventional straddle erase type magnetic head, Figure 2 is an exploded perspective view showing the arrangement of the recording/reproducing and erasing cores in Figure 1, and Figure 3 is the magnetic head of the present invention. Fig. 4 is an external perspective view of an embodiment of the winding frame used in the head, Fig. 4 is an external perspective view of an embodiment in which the back core is penetrated and insulated, and Fig. 5 is an erasing head according to an embodiment of the magnetic head of the present invention. FIG. 3 is an external perspective view excluding relationships. In the figure, 1, 2: magnetic core, 3: back core, 4: coil, 5, 5': core member for erasing head, 6: magnetic yoke, 7: coil for erasing head, 10: stretching collar, 11: pawl. , 12: protrusion,
13: Winding frame, 14: Magnetic gap, 15: Erasing magnetic gap, 16: Tsuba, 17, 17': Open surface,
18: Insulating sheet material.

Claims (1)

[Scope of utility model registration request] two magnetic cores 1 and 2 made of soft magnetic material and whose tips abut against each other to form a magnetic gap 14;
In a magnetic head for recording and reproducing in which a closed magnetic path is formed by the rear end of the magnetic core and the back core 3 which is in contact with the magnetic core at both ends, flanges 16 at both ends of the winding frame 13 around which the coil 4 is wound are provided with an outward direction. A prismatic pawl 11 made of an insulating material with a length equal to the thickness of the magnetic core is formed, and at least one of the four sides of the portion of the winding frame around which the coil is wound is open. The width of the part of the winding frame around which the coil is wound is narrower than the width of the back core, and the back core penetrates the winding frame, and the coil of the winding frame is wound. A magnetic head in which a portion is insulated by an insulating sheet material 18 and is wound by the coil to fix the back core, and the magnetic core is clamped and fixed between the pawl and the back core.