JPS619810A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the workability and the yield for production of an audio erasing head by providing a head case with a groove part opened to the side face opposite to the joint surface side of a combinational head and setting a structure material consisting of an erasing head core and a winding into this groove part. CONSTITUTION:Since a groove part 101 is opened to the side face opposite to the AC head attaching face, an adhering and fixing epoxy resin has no influences upon AC head attaching dimensions even if it is flowed out, and it is unnecessary to remove the flowed-out resin. Since a spring groove 102 is provided in the direction orthogonal to the groove part 101, the mechanical strength of the whole of a head case 100 is enhanced in comparison with the case where they are provided in the same direction, and cracks or the like of the head case 100 at the mechanical working time are prevented. The head case 100 is made of ceramic materials which can be subjected to injection molding, and the head case 100 is obtain by injection molding; and further, the head case 100 is ground under the same condition as a magnetic core 3 (ferrite material) because ceramic materials have the same hardness as the magnetic core.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention provides a combination head (combination head) in which a gutter and a control head are integrated for audio recording and reproduction used in a VTR.
The present invention relates to a magnetic head consisting of a magnetic head (hereinafter referred to as an AC head) and an audio erasing head attached to the side of the head for erasing the signal of the audio recording/reproducing head, and is particularly suitable for simplifying the manufacturing and assembling method of the audio erasing head. It is related to magnetism.

[Background of the invention]

Previously, the sound of the head of the current price... was the first
As shown in Figure (a), the molded case 1 and the non-magnetic dummy 2 made of ferrite are separated, and the structure consisting of the throat core 3 and winding 4 is assembled into the ferrite eraser. -. This was done from the rear of the throat case 1, and after gluing these together with epoxy resin, the tape sliding surface was ground and finished, and the sound was erased with the structure shown in FIG. 2(h).

However, the sound erasing head having the above structure has poor workability such as adhesion of the non-magnetic dummy 2 and assembly of the structure consisting of the core 3 and the winding 4, and also has problems such as poor adhesion of the non-magnetic dummy 2. As a result, cracks may occur in the non-magnetic dummy 2 during the grinding process, causing a decrease in yield. In addition, 5 is the screw hole when combining the AC head, 3
g, 3A is the erase gap.

Furthermore, as shown in Fig. 2 (α), in the head case 6 in which the case material forms the tape channel and moving surface, ferrite material is conventionally used for the magnetic core of the head case 6. Therefore, injection molding is impossible because it is made of steatite, which has the same hardness, and compression molding must be used.Due to the structure of the mold, pressure cannot be applied in one direction, and the structure is simple. I had no choice but to make it my own. Furthermore, the surface properties of the tape sliding surface were unreliable as a sliding surface of a magnetic tape for VTR because steatite was porous.

In addition, since the groove in which the structure consisting of the eraser rad core 3 and the winding 4 is installed is opened on the side where the AC head is installed, when the structure is installed and fixed with epoxy resin, the epoxy resin The resin protrudes from the joint surface with the head, causing variations in the assembled dimensions.To eliminate this problem, the protruding resin must be removed, which causes a decrease in workability.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems.5 It is an object of the present invention to improve workability and yield during the production of audio erasing heads, and to improve the surface quality of the magnetic tape sliding surface. An object of the present invention is to provide a magnetic head that can improve reliability.

[Summary of the invention]

A feature of the present invention is that the tape sliding surface is used as a head case of an audio erasing head for erasing the signal of the audio recording and reproducing head, which can be seen on the side surface of a combination head in which an audio recording and reproducing head and a control head are integrated. A ceramic material is used in which the parts other than the erasing helide core are made of the same material, and a groove opening is provided on the side surface of the head case opposite to the joint surface of the combination head, and the groove is formed in the groove. The main feature is that the structure incorporates a structure consisting of a rad core and a winding wire.

[Embodiments of the invention]

The present invention will be explained in detail below using the embodiments shown in FIGS. 3 and 4.

FIG. 3 is a configuration diagram showing an embodiment of the audio erasing head of the magnetic head of the present invention, FIG. 3 (α) is an exploded perspective view, and FIG. 3 (h)
is a perspective view after completion, and (c) is a rear perspective view of FIG. 6 (Al). In FIG. The groove portion 101 provided in the head case 100 of the AC
It has an opening on the side opposite to the head mounting surface, and after incorporating the above structure into the groove 101, it is adhesively cured with 5 epoxy resin, and the tape sliding surface is ground.
) as a finished product. In addition, head case 100
is constructed of a non-magnetic, injection moldable ceramic material. Further, as shown in FIG. 3(C), a spring groove 102 for combination with the AC head is provided in the rear part of the head case 100 in a direction perpendicular to the direction of the groove part 101. It is hidden from the front side of the case 100.

According to the embodiment of the present invention described above, since the groove portion 101 is open on the side surface opposite to the AC head additional surface, even if the epoxy resin for adhesive fixing protrudes, it does not affect the AC head image attached size. This eliminates the need to remove protruding resin, and improves workability.

Furthermore, since the spring grooves 102 are provided in a direction perpendicular to the direction of the groove portion 101, the mechanical strength of the entire head case 100 can be increased compared to a case where the spring grooves 102 are provided in the same direction.
Problems such as cracking of the head case 100 during machining do not occur.

Further, the head case 100 is made of a ceramic material that can be injection molded, and can be injection molded into the shape described above. Furthermore, the ceramic material has the same hardness as the magnetic core 3 (ferrite material). Therefore, the grinding process can be performed under the same conditions as the magnetic core 3, and the flatness of the tape sliding surface is also good. In addition, injection moldable ceramic materials have uniform material distribution density in each part, so they have good dimensional stability after firing, and the ground surface has higher dimensional accuracy than conventional steatite ceramic materials. Since the porosity of the parts is significantly small, there is less dust adhering to the minute holes when the tape slides, and reliability can be improved.

In addition, as shown in FIG. 3 (α), the head case 100
Cut off the outer edge of the sliding surface of the tape diagonally to form a slope 10.
6, the cutting allowance during processing of the tape sliding surface can be reduced by 71%, and the amount of grindstone used during processing can be reduced.

FIG. 4 is a diagram showing an embodiment of the magnetic head of the present invention in which an AC head and an audio erasing head are combined.
α) is a front view, and bl is a plan view. In FIG. 4, 7 is an AC head, 71 is an audio head, and 72 is a control head.

The AC head 7 and the sound erasing head 8 according to the present invention are engaged with each other by an AC head combination spring 9 using a spring groove 102.

As described above, according to the embodiments of the present invention described above.

+11 Since injection moldable ceramic material is used for the head case 100, the porosity after firing is small, there is little strain on the magnetic tape when running, and the tape sliding surface is formed into the head case without impairing reliability. Can be configured by itself.

(2) There is no need to specifically incorporate a non-magnetic dummy into (11), and the workability of head assembly can be improved.

(3) Since the groove 101 for assembling the structure consisting of the magnetic core 3 and the winding 4 opens on the side opposite to the surface where it is combined with the AC head, the epoxy resin for fixing the structure protrudes. Also, it does not affect the dimensions of the AC head, and there is no need to remove it, improving work efficiency.

(4) Since the head case 100 is made of a ceramic material that can be injection molded, it can be molded into a complicated shape.

When combined with an AC head, it can be connected by a spring, and the workability of one assembly can be improved.

(5) Since the spring groove 102 is provided in a direction perpendicular to the opening direction of the groove portion 101, mechanical strength can be increased.
Moreover, such a configuration means that the head case 1
Since 00 is an injection moldable ceramic material, it can be easily realized by injection molding.

[Effects of the Invention] As explained above, according to the present invention, it is possible to improve workability and yield when manufacturing an audio erasing head, and to improve the reliability of the surface quality of the magnetic tape sliding surface. It has the effect of being able to improve.

[Brief explanation of the drawing]

1 and 2 are block diagrams of a conventional audio erasing head, FIG. 3 is a diagram showing an embodiment of the audio erasing head of the magnetic head of the present invention, and FIG. 4 is a block diagram of the magnetic head of the present invention. A
It is a figure which shows one Example of the state in which the sound erasing head is combined with the C throat. 3...Audio erasure magnetic core 4...Winding 7...AC
Head 8...Audio erasing head 9...Combination spring 71...Audio head 72...Control head 100...Head case 101...Groove portion 102
...Spring groove

Claims (1)

[Claims] 1. A tape sliding surface used as a head case for an audio erasing head that erases the signal of the audio recording and reproducing head, which is attached to the side surface of a combination head in which an audio recording and reproducing head and a control head are integrated. The erasing head is made of a ceramic material in which the parts other than the core part are integrally made of the same material, and a groove opening is provided in the side surface of the head case opposite to the joint surface side of the combination head, and the groove is formed in the groove. A magnetic head characterized in that it incorporates a structure consisting of an erasing head core and a winding. 2. The magnetic head according to claim 1, wherein the ceramic material is a non-magnetic and injection moldable ceramic material.