JPH0453004B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a head device, and more particularly, an external conductor for connecting a recording/reproducing head whose relative position changes and an external circuit is provided by passing through a support member of the head. This invention relates to a head device.

[Prior Art] As this type of head device, a so-called rotating (autorotating) magnetic head device is known, and conventionally it is constructed as shown in FIGS. 1 and 2.

In both figures, the reference numeral 1 designates a magnetic head, which records and reproduces information by sliding its upper sliding surface facing the magnetic core 2 on a magnetic tape of a magnetic recording medium (not shown). A tape guide 3 is attached to the side surface adjacent to the sliding surface, and connection terminals 4, 4 connected to the ends of a coil winding (not shown) wound around the magnetic core 2 are implanted on the bottom surface. There is.

Reference numeral 5 designates a rotary holder which is a support member for the magnetic head, and is formed hollow, and the magnetic head 1 is fitted and held in an opening 5a at the upper part of the rotary holder. The rotary holder 5 has a cylindrical shaft portion 5b at its lower part, and is rotatably supported on a magnetic recording/reproducing device (not shown) via this shaft portion 5b in the directions of arrows A and B. . Also, the shaft portion 5b
A through hole 5c is formed to penetrate in the axial direction, through which a plurality of external conductors 6 are inserted into the rotary holder 5, and one end 6a of the external conductor wire 6 is connected to the connection terminal 4 of the magnetic head 1. The other end 6b is connected to an external circuit (not shown) fixedly provided to the magnetic recording device.

In such a configuration, during recording and reproduction, the rotating holder 5 is rotated 180 degrees alternately in the directions of arrows a and b by driving means (not shown) as shown in FIGS. 3A and 3B according to the running direction of the magnetic tape. At the same time, the end 6a side of the external conductor 6 connected to the magnetic head 1 and its connecting terminals 4, 4 also rotates.

However, during this rotation, the end 6b of the external conductor 6
Since the side is fixed to the external circuit and does not rotate,
The external conducting wire 6 is twisted and force is applied to the end portion 6a and the connecting portion of the connecting terminal 4. As a result, there is a drawback that the connection portion frequently breaks due to frequent use.

Also, in such a rotary magnetic head, the fourth
As shown in the figure, there is also a configuration in which the external conductor 6 is inserted into a tube 7 such as a heat shrink tube, held in a bundle, and inserted into the through hole 5c of the rotary holder 5 via the tube 7, but in this configuration, It is the same that force is applied to the connection part mentioned above when rotating, so
The above-mentioned disconnection cannot be prevented.

[Purpose] The present invention has been made in view of the above circumstances, and is applicable not only to the above-mentioned rotary magnetic head but also to connection between a recording/reproducing head whose relative position changes and an external circuit, as mentioned at the beginning. To provide a head device in which an external conductor is provided by passing through a supporting member of the head, and which can ensure reliable connection between the head and the external conductor with a simple and inexpensive configuration.

[Structure of the Invention] In order to achieve the above object, the present invention provides a head device of the type described above, in which an external conductor is inserted through a support member through an elastic tube, and a support member for passing the external conductor through the support member. A structure is adopted in which the width of a part of the through hole is made smaller than the outer diameter of the tube, and the tube is press-fitted into the through-hole and the external conductive wire is fixed at the press-fitted portion.

[Example] Hereinafter, details of an example of the present invention will be described with reference to FIG. 5 and subsequent figures. Here, the above-mentioned rotary magnetic head device is used as an example, and in each figure, the same or corresponding parts as in Figs. 1 to 4 of the above-mentioned conventional example are given the same reference numerals, and the same parts are Detailed explanation will be omitted.

[First Embodiment] FIGS. 5 and 6 illustrate the configuration of the first embodiment of the present invention. FIG. 5 is a longitudinal cross-sectional side view of the rotary holder 5, and FIG. 6 is a rotary type in an assembled state. FIG. 3 is a longitudinal sectional side view of the magnetic head device.

As shown in FIG. 5, in this embodiment, the through hole 5c of the rotary holder 5 for passing the external conductor is formed in the shape of an inverted truncated cone, and its inner diameter (width) is on the entrance side on the magnetic head mounting side. The diameter is gradually reduced from the inner diameter K1 of the outlet to the inner diameter K2 of the outlet at the lower end of the shaft portion 5b.

An external conductor 6 having an end 6b connected to a connecting terminal 4 of a magnetic head 1 constructed in a conventional manner as shown in FIG.
After being inserted into the through hole 5c with the end 6a first, the magnetic head 1 is fitted into the opening 5a and fixed.

However, in this embodiment, the external conductor 6 is designated by the reference numeral 7 in the figure.
It is inserted into the heat shrink tube shown in . The heat-shrinkable tube 7 is already known to shrink by heating and has elasticity. In this case, the heat-shrinkable tube 7 shrinks by heat treatment so that its outer diameter K3 becomes the above-mentioned value when the external conductor 6 is held and no external force is applied. Inner diameter K1,
The configuration is such that K1>K3>K2 with respect to K2.

Due to this relationship, the heat-shrink tube 7 is caught in the middle part of the through hole 5c during the above-mentioned insertion, but at that time, it is necessary to apply further force to pull out the end 6b side of the external conductor 7 that has already come out from the through hole 5c. by the 6th
As shown in the figure, the heat-shrinkable tube 7 is further contracted and deformed through its own elasticity, and is press-fitted into the through-hole 5c and inserted.

As a result, the heat-shrinkable tube 7 is pressed into contact with the through hole 5c at the press-fitting portion and is fixed, and the external conducting wire 6 at this press-fitting portion is also fixed.

As described above, in this embodiment, the external conductive wire 6 is fixed to the rotary holder 5 at the press-contact portion, so that the portion on the side of the magnetic head 1 from the fixed portion is attached to the rotary holder 5 during rotation during recording and reproduction as described above. rotates with Therefore, no force is applied to the connecting portion between the connecting terminal 4 and the external conductor 6, and occurrence of disconnection at this portion is prevented.

[Second Embodiment] FIGS. 7 to 9 illustrate the configuration of a second embodiment of the present invention.

As shown in the vertical side view and top view of FIGS. 7A and 7B, in the rotary holder 5 of this embodiment, the through hole 5c through which the external conductor 6 is inserted is formed in a cylindrical shape with an inner diameter (width) of K4. , a protrusion 5d is formed on one inner surface thereof. The protrusion 5d has a substantially triangular cross section when viewed from above, and is formed as a protrusion from the vicinity of the entrance of the through hole 5c on the side where the magnetic head 1 is attached to the exit of the through hole 5c, and gradually extends from the vicinity of the entrance. It is raised and has a constant height below the middle part. The width K5 between the top and the inner surface of the through hole 5c facing the through hole 5c, the inside diameter K4 of the through hole 5c, and the outside diameter K3 of the heat shrink tube 7 have a size relationship of K4>K3>K5. There is.

In the structure of the rotary holder 5, as shown in FIGS. 8A and 8B, the heat shrink tube 7
an external conductor 6 held in the magnetic head 1 and connected to the magnetic head 1;
is inserted, and the magnetic head 1 is fixed to the rotary holder 5. And when inserting the above, K4>K as mentioned above.
Due to the relationship 3>K5, heat shrink tube 7 has through hole 5
It is inserted by press-fitting into c. That is, as shown in the enlarged view of FIG. 9, the heat-shrinkable tube 7 is deformed, press-fitted, and inserted between the protrusion 5d and the inner surface of the through hole 5c. As a result, the heat-shrinkable tube 7 is fixed to the rotary holder 5 at this press-fitted portion, and the external conducting wire 6 is fixed at this press-fitted portion, similarly to the first embodiment described above.

Even with such a structure, since the external conducting wire 6 is fixed to the rotary holder 5, the same effect as described above can be obtained. In short, the width of a part of the through-hole 5c is made smaller than the outer diameter of the heat-shrinkable tube 7, and the heat-shrinkable tube 7 is press-fitted into the through-hole 5c and inserted, thereby fixing the external conductor 6 at the press-fitted part. Good.

Note that, of course, other elastic tubes may be used instead of the heat-shrinkable tubes.

Furthermore, the above-mentioned external conductor fixing structure can of course be applied to magnetic head devices in which the head is swingably supported, and can also be applied to head devices of systems other than magnetic recording and reproducing. Of course, it can be widely applied.

[Effects] As is clear from the above description, according to the present invention, an external conductor connecting a recording/reproducing head whose relative position changes and an external circuit is inserted through a supporting member of the head via an elastic tube. In the head device provided as Since we have adopted a structure in which the external conductor is fixed at a certain point, the structure is extremely simple and inexpensive, and has the excellent effect of preventing disconnection at the connection between the head and external conductor and improving the reliability of the head device. can get.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are a perspective view and a longitudinal sectional side view showing the configuration of a conventional rotary magnetic head device, respectively;
3A and 3B are top views showing the rotation of the device, FIG. 4 is a vertical cross-sectional side view of another conventional device, FIG. 5 is a vertical cross-sectional side view of the rotary holder according to the first embodiment of the present invention, and FIG. The figure is a vertical side view of the rotary magnetic head device according to the same embodiment, FIG. 7A is a vertical side view of the rotary holder according to the second embodiment, and FIG. 7B is a cross-sectional view taken along line X-X of FIG. 7A. , FIG. 8A is a vertical sectional side view of the same embodiment device, FIG. 8B is a sectional view along the Y-Y line of FIG. 8A, and FIG. 9 is an enlarged view of the shaft portion of FIG. 8B. . 1... Magnetic head, 5... Rotating holder, 5c...
...Through hole, 5d...Protrusion, 6...External conductor, 7...
...Heat shrink tube.

Claims (1)

[Claims] 1. In a head device in which an external conductor connecting a recording/reproducing head whose relative position changes and an external circuit is inserted through a support member of the head via an elastic tube, the support member through which the external conductor is inserted is provided. A head device characterized in that the width of a part of the through hole is made smaller than the outer diameter of the tube, and the tube is press-fitted into the through-hole to be inserted therethrough, thereby fixing an external conducting wire at the press-fitted portion.