JP2546058Y2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic head, and more particularly, to an assembly structure of a magnetic head.

(Prior art) Generally, a magnetic head serving as a 1 / 2-inch VTR audio control head has a recording / reproducing head section and an erasing head section, and the erasing head section is disposed adjacent to the recording / reproducing head section. Have been.

In this type of magnetic head, for example, as described below, for example,
A recording / reproducing head body and a control head body are arranged in a recording / reproducing head holder to form a recording / reproducing head section, and an erasing head body (ferrite core) is arranged in an erasing head holder to form an erasing head section. It is joined by a clamp spring or a screw to form an integrated magnetic head for audio control.

By the way, in this type of magnetic head, the erasing head generally includes a dummy head together with the erasing head.

Here, with reference to FIG. 5, the structure of the erasing head section in the conventional magnetic head will be described.

A head body storage space is defined in the resin holder 51. In the head storage space, an erasing head body (ferrite core) 52 is arranged first, and then a dummy head body (ferrite core made of the same material as the erasing head body) 53 is arranged. At this time, in order to position the dummy head body 53 and temporarily hold the erasing head body 52 and the dummy head body 53 in the head storage space, a metal spring member 54 is inserted into the head storage space to remove the dummy head body 53. Press to bring the erase head body 52 and dummy head body 53 into close contact. Thereafter, the head housing space is filled with resin, the erasing head body 52 and the dummy head body 53 are held in the holder 51, and the head surface is polished.

(Problems to be Solved by the Invention) As described above, in the conventional magnetic head, when the erasing head body 52 and the dummy head body 53 are temporarily held, a metal spring member must be inserted, and thus the head There is a problem that not only the assembly is troublesome but also the number of parts increases.

An object of the present invention is to provide a magnetic head which is easy to assemble and has a small number of parts.

(Means for Solving the Problems) According to the present invention, in a magnetic head having a recording / reproducing head portion for performing recording / reproducing and an erasing head portion provided adjacent to the recording / reproducing head portion, The erase head is
A resin holder in which a predetermined storage space is defined, an erasing head body and a dummy head body, and an arc-shaped thin elastic holding portion integrally formed with the holder on the inner wall of the storage space and protruding inside the storage space. The erasing head body and the dummy head body are temporarily filled with the resin by temporarily holding the erasing head body and the dummy head body in the housing space by the elastic force of the thin elastic holding portion. The characteristic magnetic head is obtained.

(Operation) In the present invention, an arc-shaped thin elastic holding portion projecting into the storage space is integrally formed on the inner wall of the storage space defined by the holder. The thin elastic holding portion is formed by, for example, injection molding together with the holder. When the erasing head body is placed in the storage space, and then the dummy head body is pushed in, the dummy head body is pressed into the storage space by the elastic force of the thin elastic holding portion, whereby the erasing head body and the dummy head body Is temporarily held in the storage space.

Thus, in the present invention, the erasing head body and the dummy head body can be temporarily held in the storage space only by pushing the dummy head body into the storage space. As a result, it is extremely easy to assemble the head and the number of parts can be reduced.

(Example) Hereinafter, the present invention will be described with an example. First,
Referring to FIG. 1 (a), the illustrated magnetic head includes a recording / reproducing head section 11 and an erasing head section 12, and the recording / reproducing head section 11 and the erasing head section 12 are fixed by a clamp spring or a screw. Are joined.

The recording / reproducing head unit 11 includes a recording / reproducing holder 11a and a recording / reproducing head body 1.
The recording / reproducing head body 11b and the control head body 11c are made of a metal core such as permalloy. Recording play head 11b
The control head 11c is held in a storage space defined by the recording / playback holder 11a.

On the other hand, the erasing head section 12 includes an erasing holder 12a, an erasing head body (ferrite core) 12b, and a dummy head body 12c.
Erasing head body 12b and dummy head body 12c
Are held in a storage space defined by the erasing holder 12a. This dummy head body is formed of a ferrite core similarly to the erase head body 12b, and the erase head body 12b
It is provided in order to maintain uniformity (abrasion) of sliding contact with the tape in other parts.

As shown in FIG. 1B, the recording band of the 1 / 2-inch VTR tape includes an audio signal recording area 111 (stereo or monaural), a video signal area 112, and a control signal area 113.
Are defined, and the recording / reproducing head 11a records and reproduces the audio signal and the video signal. At this time (at the time of recording and reproduction), recording and reading of control signals are simultaneously executed by the control head 11c. The erasing of the audio signal is performed by the erasing head body 12b.

Here, the structure of the erasing head unit will be described in detail with reference to FIGS. 2 and 3. FIG.

The erasing head holder 12a is made of resin, and a storage space is defined in the holder 12a. On the inner wall of the storage space, a resin holding body 121 protruding inside the space has a holder 12a.
The holding body 121 is formed in a thin elastic portion in an arc shape that is convex inward as shown in the figure.
Such a holder 12a is formed by, for example, injection molding.

When assembling the erasing head section 12, first, the erasing head body 12b is arranged in the storage space of the holder 12a, and then the dummy head body 12c is inserted into the storage space. During this insertion,
Since the holding body 121 is made of resin, it slightly deforms outward,
The dummy head body 12c can be easily inserted. After the insertion of the dummy head body 12c, the dummy head body 12c is pressed rightward in FIG. 3 by the restoring force of the holding body 121. As a result, the dummy head body 12c and the erasing head body 12b are brought into close contact with each other and are temporarily held by the holder 12a. Thereafter, the storage space is filled with resin, and the head surface is polished while holding the erase head body 12b and the dummy head body 12c in the holder 12a.

Further, the formation location of the holding body 121 is not limited to the location shown in FIG. 2 and FIG. 3, and for example, as shown in FIG. The holding body 121 may be formed on the inner wall of the storage space in relation. In this case, after placing the dummy head body 12c in the storage space, the dummy head body 12c is moved in the direction of the erase head body 12b.
By pressing, the dummy head body 12c is sandwiched between the holding body 121 and the inner wall of the storage space in a state where the erase head body 12b and the dummy head body 12c are in close contact with each other, so that the erase head body 12b and the dummy head body 12c Can be temporarily held.

(Effects of the Invention) As described above, in the present invention, in the voice erasing head, the arc-shaped thin elastic holding portion projecting into the storage space is integrally formed on the inner wall of the storage space defined by the holder. Just insert the dummy head body into
Since the holder can temporarily hold the erasing head and the dummy head body, there is an effect that the head assembly becomes extremely easy and the number of parts can be reduced.

[Brief description of the drawings]

1 (a) is a perspective view showing the structure of a magnetic head, FIG. 1 (b) is a diagram schematically showing a recording band of a 1 / 2-inch VTR tape, and FIGS. 2 and 3 are the present invention. FIG. 4 is a diagram showing the configuration of an embodiment of the erasing head section of the magnetic head according to the present invention, FIG. 4 is a diagram showing the configuration of another embodiment of the erasing head section of the magnetic head according to the present invention, and FIG. FIG. 3 is a diagram illustrating a configuration of an erasing head unit. 11… Recording / playback head section, 11a …… Recording / playback holder, 11b ……
Recording / playback head, 11c ... Control head, 12 ...
Erasing head section, 12a: Erase holder, 12b: Erase head body, 12c: Dummy head body, 121: Holder.

Claims (1)

(57) [Scope of request for utility model registration] 1. A magnetic head having a recording / reproducing head for performing recording / reproducing and an erasing head provided adjacent to the recording / reproducing head, wherein the erasing head has a predetermined storage space. A predetermined resin holder, an erasing head body and a dummy head body, and an arc-shaped thin elastic holding portion integrally formed with the holder on the inner wall of the storage space and protruding inside the storage space; A magnetic head, wherein the storage space is filled with resin by temporarily holding the erasing head body and the dummy head body in the storage space of the head body and the dummy head body by the elastic force of the thin elastic holding portion. .