JPS61289508A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent generation of a chip or crack of a magnetic core by installing, on the outer surface of the magnetic core, a member which is made of a nonmagnetic material and separates a coil from the magnetic recording medium sliding surface of the magnetic core. CONSTITUTION:Conventional coil grooves 2 and 2 are not formed on end surfaces at both outer sides facing the collating surfaces of core half bodies 11 and 12. Instead of them, projecting parts 9 and 9 made of the nonmagnetic material are additionally installed on the upper ends at the side of the sliding surface of the end surface by jointing them with an adhesive. In this case the sections of the projecting parts 9 and 9 are formed approximately in an arc shape. By the projecting parts 9 and 9 a coil 7 is wound in an area at the lower side on the outer surface of the magnetic core through a coil window 3, and the projecting parts 9 and 9 prevents the coil 7 from becoming loose and shifting to the side of the sliding surface 4. Accordingly the coil 7 is separated from the sliding surface 4. Thus the crack of the magnetic core can be prevented, and the titled head can be manufactured at a moderate price due to the simple structure and simple steps.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a magnetic head, and more particularly to a magnetic core that slides on a magnetic recording medium, and a magnetic core that is wound on the outer surface of the magnetic core near the sliding surface of the magnetic recording medium. The present invention relates to a magnetic head composed of windings.

[Prior Art] As an example of a conventional magnetic head of this type, in a video head used in a video tape recorder, a winding wire is wound around a magnetic core by stacking several tens of turns. It may fray and move to the media sliding surface, causing wire breakage during sliding surface processing or when the media slides. To prevent this, generally a winding groove is formed at the end of the magnetic core on both sides closer to the medium sliding surface, the winding is applied through this groove, and the winding is separated from the sliding surface. There is.

The structure of such a conventional video head is shown in FIG.

In FIG. 1, the core half-holes indicated by reference numerals 11 and 12 are each made of a ferromagnetic material in the shape of a substantially rectangular thin plate.
The magnetic core is constructed by glass welding and joining at the part indicated by .

The upper surface of the magnetic core in the figure, that is, the upper surface of the core half-opening 11° 12, is formed as a magnetic tape sliding surface (hereinafter abbreviated as sliding surface) 4 that slides on a magnetic tape (not shown). A magnetic gap 5 is formed between the abutting surfaces of the core half-holes 11 and 12 facing each other.

In addition, winding grooves 2, 2 are formed in the upper end of the outer end surface facing the abutting surface of each core half body 11 and 12, which is closer to the sliding surface 4 side, and the abutting surface of one core half body 12 A winding window 3 is formed at the upper end portion closer to the sliding surface 4 side.

The winding 7 is then passed through the winding grooves 2, 2 and the winding window 3.
A magnetic head is constructed by winding a predetermined number of turns on the outer surface of a magnetic core.

By the way, a video head with this structure has a frequency of several MHz.
Since recording and reproduction are performed in a high frequency band, in order to generate a high-density leakage flux in the magnetic gap 5, the depth of the magnetic gap 5 should be made as shallow as possible, and the winding 5 should be placed on the sliding surface 4. You need to wrap it close.

However, for this purpose, the winding grooves 2, 2 are brought closer to the sliding surface 4,
When the width W of the edges 8, 8 between the sliding surface 49 and the winding groove 2 is reduced, the mechanical strength of the edges 8, 8 becomes weaker, and even when the winding 7 is wound in layers, the winding force direction The lateral force is 1 against
When this moves and presses against the edge 8.8, there is a problem in that chipping or cracking occurs in this area.

Further, in the above structure, precision machining using a slicer or the like was required to form the winding grooves 2, 2.

[Purpose] The present invention has been made in view of the above-mentioned problems, and is intended to solve problems such as disconnection of one winding not only in the above-mentioned video heads but also in the types of magnetic heads described in the first technical field. It is an object of the present invention to provide a magnetic head that is free from inconveniences, can prevent chipping and cracking of the magnetic core, and can be manufactured at low cost with a simple structure and simple process.

[Structure of the Invention] In order to achieve the above object, the present invention provides a magnetic head of the type described in the technical field, in which a winding made of a non-magnetic material is provided on the outer surface of the magnetic core for magnetic recording of the magnetic core. A structure with a member separating it from the media sliding surface was adopted.

[Example] Hereinafter, details of embodiments of the present invention will be described.

FIG. 2 is a perspective view showing the structure of a video head according to an embodiment of the present invention. In the figure, the same or corresponding parts as in FIG. 1 of the conventional example are given the same reference numerals. Explanation will be omitted.

As shown in FIG. 2, in the head of this embodiment, the conventional winding grooves 2.2 are not formed on the end surfaces of the core half-holes 11 and 12 on both sides opposite to the abutting surfaces. A convex portion 9.9 made of a non-magnetic material is attached to the upper end of the end face on the side of the sliding surface 4 by, for example, bonding with an adhesive.

In this case, the convex portions 9, 9 are formed in a columnar shape with a substantially arc-shaped cross section.

The winding 7 is then passed through the convex portion 9.9 and the conventional winding window 3 formed on one core half 12 to the area below the convex portion 9.9 on the outer surface of the magnetic core. It is wound and is prevented from unraveling and moving toward the sliding surface 4 by the convex portion 9.9, and is separated from the sliding surface 4. The structure of other parts is the same as that of the conventional example described above.

According to the structure of this embodiment as described above, since there is no mechanically weak part like the edge 8 of the conventional example in the area where the winding 7 of the magnetic core is wound, the pressing force of the winding is reduced. This prevents chips and cracks from occurring. Further, since the convex portion 9 can be attached to the conventional winding groove 2 which requires precision machining by an extremely simple process such as gluing, the manufacturing process of the entire head can be simplified.

In the configuration of this embodiment, synthetic resin, ceramics, non-magnetic metal, etc. are preferably used as the non-magnetic material forming the convex portion 9, and a composite material combining multiple types of these materials may be used. Also good. In addition, when using a synthetic resin, it may be a thermosetting resin or a thermoplastic resin.
Further, additives such as fillers, plasticizers, extenders, lubricants, etc. may be added to this.

Furthermore, as for the method of attaching the convex portion 9 to the outer surface of the magnetic core, it may be attached directly to the outer surface of the magnetic core other than by bonding with an adhesive, or may be bonded to the magnetic core using another structure.

Furthermore, the shape and structure of the convex portions 9 is not limited to that of the above embodiment, but any shape may be used as long as the winding 7 can be separated from the sliding surface 4, and the number of the convex portions 9 is also two. There is no limitation, and the number of protrusions 9 may be one or three or more, and the location on the outer surface of the magnetic core where the protrusion 9 is provided is not limited to that in the above embodiment, but may be provided in another location, for example in the case of the embodiment. It may also be provided below the winding area of the winding 7 on the outer side of the core halves 11,12.

Furthermore, as mentioned above, the structure of the present invention in which a member made of a non-magnetic material and separating the winding from the medium sliding surface is attached on the outer surface of the magnetic core is not limited to the video head of the embodiment. Of course, the present invention can be applied to all types of magnetic heads mentioned in the field.

[Effects] As is clear from the above description, according to the present invention, in the magnetic head of the type described in the technical field section, a winding made of a non-magnetic material is placed on the outer surface of the magnetic core to connect to the magnetic core. Adopting a structure with a member separating it from the recording medium sliding surface, there is no inconvenience such as winding breakage, and the magnetic core can be prevented from chipping or cracking.The structure is simple and the process is simple, making it inexpensive. It is possible to provide an excellent magnetic head that can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a conventional video magnetic head, and FIG. 2 is a perspective view showing the structure of a magnetic head according to an embodiment of the present invention. 3... Winding window 4... Magnetic tape sliding surface 5
...Magnetic gap 6...Glass welded part 7...
・Winding 9...Convex part 11.12...Core half-closed

Claims (1)

[Scope of Claims] 1) A magnetic head comprising a magnetic core that slides on a magnetic recording medium, and a winding wound on the outer surface of the magnetic core in the vicinity of the sliding surface of the magnetic recording medium. A magnetic head characterized in that a member made of a non-magnetic material and separating the winding from the sliding surface is attached on the outer surface of the magnetic core. 2) The magnetic head according to claim 1, wherein at least one of synthetic resin, ceramics, and metal is used as the nonmagnetic material.