JPH03156708A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce the possibility of damaging the insulation sheath of a winding and to prevent part of a coil from being wound on a part with less magnetic reluctance by extending the end of a winding ditch opposite to a magnetic gap from the part at the end of the winding window. CONSTITUTION:The end of a winding ditch 4 at the side of a sliding face 1 is nearly coincident with the end of a winding window 3, but the end at the opposite side is deviated opposite to the slide face 1 largely from the end of the winding window 3. A core main body formed by bonding core halves A,B is fitted to a head base C so that a front end 6 of the head base C is resident in the winding ditch 4. Then even when the width of the coil 6 is made widened, since the coil 5 is wound onto a part with a larger magnetic reluctance formed by the winding ditch 4, the inductance L is unchanged in the actual measurement and the possibility of the insulation sheath scratched at the end of the winding ditch 4 resulting in causing short-circuit is precluded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head attached to a rotating drum used in tape recorders for video, digital audio, etc.

[Conventional technology]

Conventionally, in this type of magnetic head, as shown in FIG. 2, two core halves A and B are butted against each other to form a magnetic gap 2 on the sliding surface 1 of the magnetic tape.

In one core half A, a winding window 3 is formed on the surface that abuts against the core half B, and a winding recess 4 is formed on the opposite surface.

The positions and widths of the winding window 3 and the winding recess 4 are set to match the width of the coil 5 multiplied by the number of turns in order to increase the number of coils 5 wound thereon.

Then, the core body, in which the core halves A and B are joined so that the winding recess 4 and the helad base C do not overlap, is attached to the head base C, and the coil 5 is inserted into the winding window 3 and into the winding recess. The wire is wound around the section 4.

[Problem to be solved by the invention]

When winding the coil 5 around the core body in which the core halves A and B are joined in this way, the width of the winding recess 4 is very narrow (wire diameter of the coil 5 x number of turns), as shown in Fig. 3. Thus, the winding wire is wound across the entire width of the winding recess 4.

However, during the winding work, the wire may accidentally run onto the outside of the winding recess 4 and be wound, as shown in Figure 4, or the winding may be caught on the end of the winding recess 4, damaging its insulation coating. It ends up.

However, a magnetic head requires a constant inductance L, but the inductance is limited and the head output e is as follows.

From the above, it is better to obtain the predetermined inductance L and maximize the winding capacity. Therefore, the winding window 3 and the winding recess should be arranged so that the magnetic resistance is large, that is, the cross-sectional area is small. The coil 5 will be wound around 4 and 4.

On the other hand, if a part of the coil 5 is wound protruding from the winding recess 4, the magnetic resistance of that part becomes small, and the predetermined inductance L cannot be obtained.

Furthermore, if the insulation coating of the winding is damaged, there is a high risk of short-circuiting.

[Purpose of the invention]

The present invention solves the above-mentioned problems with the winding in conventional magnetic heads, makes the winding work easier, has less risk of damaging the insulation coating of the winding, and furthermore, the coil is placed in a part with low magnetic resistance. It is an object of the present invention to provide a magnetic head in which the portion is not wound.

[Summary of the invention]

The present invention relates to means for a magnetic head to achieve the above-mentioned object, and includes a head body in which two core halves are butted against each other, and at least one core is formed with a winding window and a winding recess. , attaching the head body to the head base with the end of the winding recess opposite to the magnetic gap extending beyond the end of the winding window, and the front end of the head base being positioned within the winding recess; This purpose can be achieved by winding the coil through the winding window into the winding recess.

[Embodiments of the invention]

Next, an example of implementation of the present invention will be described with reference to FIG.

This magnetic head has a winding window 3 and a winding recess 4 in a core half A which is joined to a core half B to form a core body and forms a magnetic gap 2 on a sliding surface 1 of a magnetic tape. The structure is no different from that of conventional magnetic heads.

However, the end of the winding recess 4 on the sliding surface l side substantially coincides with the end of the winding window 3, as in the conventional case, but the end on the opposite side is the end of the winding window 3. It is largely shifted toward the side opposite to the rubbing surface 1 than the section.

For example, when the wire diameter of the coil 5 is 0.03 mm and the number of turns is 10, the width of the winding recess 4 is conventionally about 0.3 mm, but in this embodiment it is 0.7 mm.

The core body, in which the core halves A and B are joined, is attached to the head base C, conventionally with a gap of about 0.2 mm between the end of the winding recess 4 and the front end 6 of the helad base C. , was attached to head base C.

However, in the present invention, the core body is attached to the head base C such that the front end 6 of the head base C is within the winding recess 4.
can be attached to.

Therefore, conventionally, when the coil 5 is wound correctly, the windings fit tightly together in the winding recess 4 as shown in FIG. 3, but in the present invention, some gaps are allowed between the windings. Therefore, the winding width of the coil 5 may increase in the winding vA recess 4 as shown in FIG.

In this way, even if the winding width of the coil 5 is increased, the coil 5 is wound in the area of high magnetic resistance formed by the winding recess 4, so that even when the coil 5 is wound in a close-winding manner as shown in FIG. ,
Inductance does not change.

When winding the coil 5, the end of the winding recess 4 opposite to the rubbing surface 1 is located within the hend head C, and the front end 6 of the head base C serves as a guide during winding. Therefore, the winding is wound around this part and the inductance decreases,
It is possible to eliminate the risk of the insulation coating being caught on the end of the winding recess 4 and being damaged, resulting in a short circuit.

[Effects of the Invention] The present invention provides the following advantages:
Coils are often wound from the end of the winding recess on the rubbing surface side of the core body, but there is a gap between the windings, and the winding at the end of the coil is wound outside the winding recess. Alternatively, problems in the conventional winding process, such as the winding wire being caught on the end of the winding vA recess and damaging its insulation coating, can be solved.

Even if the inside of the coil in the winding recess expands, its inductance does not change, so the characteristics of the magnetic head do not deteriorate.

As described above, according to the present invention, it is possible to reduce caution and errors in the work of winding the coil around the core body, and to improve work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a plan view of a conventional magnetic head, Fig. 3 is a cross-sectional view of the winding recessed portion showing a good winding state, and Fig. 4 is a plan view of a conventional magnetic head. FIG. 5 is a cross-sectional view of the winding wire protruding from the wire recess. FIG. 5 is an explanatory diagram of the state in which the winding wire is hooked onto the end of the winding recess during winding work. A, B... Core half, C... Head base, ■...
- Tape sliding surface, 2... Magnetic gap, 3... Winding window, 4... Winding vA recess, 5... Coil, 6...
front end.

Claims (1)

[Claims] In a head body in which two core halves are butted against each other and at least one core has a winding window and a winding recess, the end of the winding recess opposite to the magnetic gap is used for winding. The head body is attached to the head base so that it extends beyond the end of the window and the front end of the head base is located within the winding recess, and the coil is wound from the winding window into the winding recess. magnetic head.