JPS6125060Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a core holder for a magnetic head that is provided with a core insertion groove into which a magnetic core is inserted. In general, magnetic heads require relative positional accuracy between a recording medium such as a tape and a magnetic core. For this reason, the position of the magnetic core 1 in the magnetic head has heretofore been precisely regulated by means such as inserting and fitting the magnetic core 1 into the core insertion groove 3 of the core holder 2 and fixing it as appropriate, as shown in FIG. However, the magnetic core 1 is usually created by laminating thin plates after pressing them, and unfortunately, it is accompanied by punching burrs (hereinafter referred to as burrs) such as press burrs or sag that occur during the pressing process. It is something that cannot be avoided. On the other hand, when the core holder 2 is cast, flash is generated at various places. When inserting and fitting the magnetic core 1 into the core insertion groove 3, the magnetic core 1
If there is burr or casting burr on core holder 2,
These burrs tend to cause the magnetic core 1 and the core insertion groove 3 to be misaligned with each other. If you try to forcefully insert and fit the magnetic core 1 while the misalignment that has occurred in this way exists, the magnetic core 1 will be deformed, and the magnetic properties such as magnetic permeability of the magnetic core 1 will deteriorate. There were some shortcomings.

As a measure to solve this drawback, as shown in FIG. 2, a chamfered portion 44 is provided on the edge facing upward of the core insertion groove 43 and parallel to the bottom surface portion 42 of the core holder 40, so that the magnetic core 1 was also attempted to be inserted and fitted in the direction B upward in the figure. The bottom surface portion 42 of the core holder 40 serves as a reference surface against which the rear portion 11 of the magnetic core 1 comes into contact when the magnetic core 1 is inserted and fitted. In this way, even if burrs or cast burrs exist as described above, the core insertion groove 4
A chamfered portion 4 provided on an edge facing upward of 3 and parallel to the bottom surface portion 42 of the core holder 40.
4 can play the role of a guide during insertion and fitting, so that the magnetic core 1 can be inserted and fitted smoothly, and defects such as deformation of the magnetic core 1 can be eliminated. However, in the rear part 45 of the core insertion groove 43, space is required for a coil bobbin (not shown) to be inserted into the rear part 11 of the magnetic core 1, so the core insertion groove 43 is formed shallowly. Core insertion groove 4
If a chamfered portion 44 is provided on the edge facing upward and parallel to the bottom surface portion 42 of the core holder 40, the height at which the magnetic core 1 of the side wall portion 46 facing parallel to each other is fitted is chamfered. The portion corresponding to the portion 44 is made smaller, so that even when the magnetic core 1 is inserted and fitted, the rear portion 11 of the magnetic core 1 does not fit into the core insertion groove 43.
The rear part 11 of the magnetic core 1 may be tilted because it cannot be held securely in the rear part 45 of the magnetic core 1, and the space between the core pieces constituting the magnetic core 1 may become wider.
The need arose to pre-glue each magnetic core piece. Further, even if each magnetic core piece is attached at the front, it is not perfect, and the coil bobbin cannot be easily fitted into the rear part 11 of the magnetic core 1, making it impossible to automate the assembly.

In order to eliminate these inconveniences, the present invention provides a magnetic core 1 into which a coil bobbin is fitted to the rear part 11 of the magnetic core 1, as shown in FIG. 3, and a core holder 30 into which this magnetic core 1 is inserted and fitted. A chamfered portion 34 is provided only on the edge of the groove 33 facing the rear side opposite to the recording medium sliding contact side and perpendicular to the bottom surface 32 of the core holder 30. The core holder 3 faces the rear side opposite to the recording medium sliding contact side of the core insertion groove 33 described above.
The chamfered portion 34 provided only on the edge perpendicular to the bottom surface 32 of the magnetic core 1 is the edge facing opposite to the recording medium sliding contact side where the magnetic core 1 slides on the recording medium, that is, the edge A in FIG. with an edge facing the magnetic core 1
This figure shows a chamfered portion 34 provided on an edge perpendicular to the bottom surface 32 of the core holder 30, which one side of the rear portion 11 of the core holder 30 comes into contact with and serves as a reference surface when the magnetic core 1 is inserted and fitted.

The magnetic core is made of permalloy or the like, and the core holder 30 is made of plastic, die-casting, or the like. The chamfered portion 34 is formed into a tapered or curved shape, and the magnetic core 1 is inserted and fitted into the core insertion groove 33 from the rear side, that is, from the direction A in the figure. .

Therefore, the rear part 35 of the core insertion groove 33 faces the side walls parallel to the full depth of the insertion groove 33, and the rear part 11 of the magnetic core 1 faces the core insertion groove 3.
It is securely held by the rear part 35 of No. 3. Therefore, the rear part 11 of the magnetic core 1 can be firmly held without being tilted or the core pieces constituting the core being expanded, and the coil bobbin can be easily fitted into the rear part 11 of the magnetic core 1. Further, the chamfered portion 34 can have a sharp inclination angle α, thereby making it easier to insert and fit the magnetic core 1.

As described above, in the present invention, the chamfer is provided only on the edge of the core insertion groove of the core holder that faces the rear side opposite to the recording medium sliding contact side and is perpendicular to the bottom surface of the core holder. Both side walls of the core insertion groove can be made parallel to each other throughout the depth of the groove, which allows the magnetic core to be securely held between them.Furthermore, it is also possible to make the chamfered portion large, which prevents deformation of the magnetic core. It has excellent practical effects, such as eliminating deterioration of magnetic properties, making insertion and fitting of the magnetic core easier, and allowing the chamfered portion to more effectively serve as an insertion guide for the magnetic core. It is.

[Brief explanation of the drawing]

1 and 2 are external views of a conventional core holder, and FIG. 3 is an external perspective view showing an embodiment of this invention. 1... Magnetic core, 30... Core holder, 3
2... Bottom surface of core holder, 33... Core insertion groove, 34... Chamfered portion.

Claims (1)

[Scope of utility model registration request] In a core holder for a magnetic head, which has a shallow core insertion groove at the rear portion into which a magnetic core for fitting a coil bobbin is inserted, there is a core insertion groove on the rear side opposite to the recording medium sliding contact side of the core insertion groove. A core holder for a magnetic head, characterized in that a chamfer is provided only on an edge that faces and is perpendicular to the bottom surface of the core holder.