JPH0633529Y2 - Magnetic head device - Google Patents

Description

The present invention relates to a magnetic head device mounted on, for example, a video tape recorder (VTR). More specifically, the present invention relates to a magnetic head device and an external lead wire for achieving electrical continuity between the magnetic head body and an external lead wire. Regarding improvement of a connector for connection.

[Outline of device]

The present invention relates to a magnetic head device including a magnetic head body in which a front core and a back core are integrally joined and a coil conductor is wound around a bobbin, and a mold case for housing the magnetic head body. , The bobbin is provided integrally with a connecting portion into which the connecting pins are respectively inserted in the flange portions, and the connecting portions provided in the state of being divided into two are combined to form an external connecting connector, which facilitates handling. This is intended to facilitate the work, simplify the assembling work, and reduce the size around the drum.

[Conventional technology]

Among various magnetic head devices mounted on a magnetic recording / reproducing device such as a VTR, for example, a fixed type magnetic erasing head device that simultaneously erases signals recorded on a magnetic tape over the entire width is
The magnetic head body, in which a coil conductor is wound around a magnetic core portion having an erasing gap via a bobbin, is housed in a mold case, and is located near the rotary drum to which the recording / reproducing head of the apparatus body is attached. Be incorporated.

In order to exchange information signals with the drive circuit on the magnetic head body and the apparatus body side, it is necessary to electrically connect the coil conductor wire and the lead wire from the drive circuit by some means. As this connection method, the head terminal connected to the coil conductor and the lead wire are directly connected by soldering.

A method of mounting a commercially available connector on a molded case, winding the end of the coil conductor around the connector, and inserting and fitting an external connector.

Etc. are known.

[Problems to be solved by the invention]

However, in the above method, this wiring work is complicated and requires a lot of man-hours for the assembly work, and there are problems in terms of reliability of soldering. In addition, although the above-mentioned method eliminates the drawbacks of the above-mentioned method, the number of parts increases and the material cost increases, the winding process of the coil end is complicated, and the end of the coil conductor is routed for a long distance. There were many defects such as disconnection defects.

From such a situation, for example, in Japanese Utility Model Publication No. 61-105907,
A connector is integrally molded on the flange of the bobbin,
A magnetic head device is disclosed that simplifies assembly work, improves yield, and reduces the number of parts.

The bobbin (100) incorporated in this magnetic head device is
As shown in FIG. 9, it comprises a coil wire winding part (101) and flange parts (102a) and (102b) provided at both ends thereof, and one flange part (102a) is externally connected. The connector (103) is integrally molded.
Then, approximately L-shaped connection pins (104) and (105) are planted in the connector (103), and the connection pins (104) and (1)
05) has a structure in which one end is a winding connection part (104a), (105a) for terminating the coil conductor, and the other end is a connector part (104b), (105b) into which an external connector is inserted and fitted. ing.

By the way, in the magnetic head device using the bobbin (100) described above, as shown in FIG.
A magnetic head main body (112) formed by winding a coil conductor (111) through a housing is housed in a mold case (113). Then, the terminal (1
11a) and (111b) are connected to the winding connection parts (104a) and (105), respectively.
Around (a) and connect the connector parts (104b), (105
An external (female) connector (not shown) is inserted in b) for wiring.

However, in this magnetic head device, the connector portions (104b) and (105b) have the sliding contact surface (115) of the magnetic tape.
Since it is provided on the back side of the device, when installing the magnetic head device in a magnetic recording / reproducing device such as a VTR, secure an extra space for inserting an external connector between the magnetic head device and the rotating drum. It must be done, and it is difficult to reduce the size around the drum. Therefore, this is a major obstacle to miniaturization of the magnetic recording / reproducing apparatus.

Therefore, the present invention has been proposed in view of such a conventional situation, and it is easy to handle and easy to assemble, and the size around the drum can be reduced when it is incorporated in the drive device, and the height is high. It is an object to provide a reliable magnetic head device.

[Means for solving problems]

In order to achieve the above-mentioned object, a magnetic head device of the present invention comprises a magnetic head body in which a front core and a back core are joined and integrated with each other, and a coil wire is wound around a bobbin, and the magnetic head body. In a magnetic head device including a mold case for accommodating, the bobbin includes a winding portion of a coil conductor and flange portions provided at both ends of the winding portion, and connecting pins are respectively inserted into both flange portions. In addition, a guide part for guiding the external connector is integrally provided along the connection pin, and the connection pin and the guide part provided in the state of being divided into two are for external connection for connecting to the external connector. It is characterized in that a connector is configured.

[Action]

In the magnetic head device of the present invention, the external connection connector is divided into two parts, and the connection parts in the divided two parts are integrally formed on both flange parts of the bobbin, respectively, and the connection pin inserted into each connection part is inserted. One end side is used for terminal treatment of the coil conductor, and the other end side is used as an insertion terminal of the external connector. Therefore, since the external connector is arranged on the lateral side surface side of the magnetic head device and the external connector is inserted from the lateral side surface side, the magnetic head device can be arranged close to the rotary drum.

Further, since the connecting portions in the state of being divided into two are integrally formed on both flange portions, a gap is formed between these connecting portions, so that there is no hindrance to the winding work of the coil conductor.

〔Example〕

Next, a specific embodiment of a magnetic head device to which the present invention is applied will be described with reference to the drawings. Hereinafter, a so-called double gearup type magnetic erasing head device in which two erasing gaps are arranged in parallel with respect to the magnetic tape running direction will be described as an example, but the present invention is not limited to this embodiment. Needless to say.

As shown in FIGS. 1 and 2, the magnetic head device of this embodiment comprises a front core (1), a back core (5), and a bobbin (7) around which a coil conductor (6) is wound. A magnetic head body and a mold case (9) for protecting the magnetic head body and ensuring contact with the magnetic tape.
It consists of and.

In the magnetic head body, side cores (3) and (4) are joined to both sides of an elongated center core (2) through gap spacers (not shown) to form a pair of magnetic gaps (erasure gap in this embodiment). On the rear end surface of the front core (1) formed by forming g ₁ , g ₂ ), a back core (5) having a substantially U-shaped cross section which is joined and integrated with the front core (1) to form a closed magnetic circuit is formed. The back core (5) is joined and wound with a coil conductor (6) around the bobbin (7).

Here, as shown in FIGS. 3 to 5, the bobbin (7) has, for example, a hollow coil winding portion (11) whose outer shape is a rectangular parallelepiped and through which the back core (5) is inserted.
And a pair of thin flange flange portions (12) and (13) provided at both ends of the winding portion (11), and one short side portion of the flange portions (12) and (13). The connection parts (14) and (15) are integrally molded in the respective parts. And
The connection part (14) provided in the state of being divided into two,
Together (15) is used as the external connection connector (20). In addition, these winding parts (11), flange parts (12),
The (13) and the connecting portions (14) and (15) are integrally formed of a highly insulating resin such as polyphenylene sulfide (trade name Ryton).

The connection portions (14) and (15) are formed by integrally molding the thick base portions (14a) and (15a) and the guide portions (14b) and (15b), respectively. ), (15a) rear end faces (14A), (15A) are formed to be flush with one of the long side portions (12A), (13A) of the flange portions (12), (13). The tip portions of the guide portions (14b) and (15b) are integrally formed so as to project from the other long side portions (12B) and (13B) of the flange portion.

Here, the base portions (14a) and (15a) are formed in parallel so that the rod-shaped connecting pins (16) and (17) can be inserted respectively. In the connection pins (16) and (17), the rear end faces (14A) and (1) of the bases (14a) and (15a) are
The connection pins projecting to the 5A) side are the winding connection parts (16a) and (17a) for terminal treatment of the coil conductor, and the base parts (14a) and (1
5a) external connector (21) on the connecting pin protruding to the front side.
It has a function as a connector part (16b), (17b) into which is inserted. As described above, in this embodiment, the pair of connection pins (16) and (17) respectively have the terminal processing function of the coil conductor and the function of the external connection connector. The connecting pins (16) and (17) are connected to the connecting portion (1
5) and (16) may be integrally formed, or the connection pins (16) and (1) may be formed after the connection parts (15) and (16) are formed.
7) may be inserted.

On the other hand, the guide portions (14b) and (15b) are engaged with the slide portions (22) and (24) so as to be flush with the outer surfaces of the slide portions (22) and (24), respectively. Department (23),
(25) and the outer shape of each is approximately L.
It has a letter shape. In addition, engaging protrusions (23a) and (25a) corresponding to the outer shape of the external connector (21) are formed at the tips of the engaging portions (23) and (25).

In this embodiment, the external connector (21) is provided with notches (21a) and (21b) at its ridge and has a substantially convex cross section. Therefore, the external connector (21) is easily and highly accurately inserted into the space formed by the slide portions (22) and (24) and the engaging portions (23) and (25), and the connection pins (16), It is configured to be electrically connected to (17).

Although not shown, for example, the guide portions (14b), (1
The slide portions (22) and (24) of 5b) are provided with engaging grooves, and the external connector (21) is provided with a projection that engages with the engaging grooves, and the external connector (21) is inserted and fitted. The connector (21) may be sometimes fixed. By thus providing the guide portions (14b) and (15b) with the locking mechanism, the reliability of the wiring is further improved.

As described above, in this embodiment, the bobbin (7) has the winding portion (11).
It has a symmetrical structure centered on the
A gap equal to the winding width m of the coil wire is formed between 4) and (15). Therefore, the external connection connector (20) is arranged so as to extend over both flange portions (12) and (13).
In the present invention, the connector (20) is divided into two parts, and a gap corresponding to the winding width m of the winding part (11) is formed between the connecting parts (14) and (15) even if they are integrally molded. Therefore, there is no problem in winding the coil conductor.

As shown in FIG. 1, the magnetic head device incorporating the bobbin (7) having such a structure has an external connector (20).
Are arranged so as to project to the lateral side of the head device. Therefore, the external connector (21) is inserted and fitted from the lateral side of the head device. At this time, the external connector (21) is easily inserted and fitted while being positioned by the guide portions (14b) and (15b).

As described above, in this embodiment, the external connector (21) is configured to be inserted from the lateral side surface side of the magnetic head device.
As shown in FIG. 6, no extra space is required for inserting the external connector (21) between the rotary drum (30) and the head device. Therefore, since the magnetic head device can be arranged in close proximity to the rotary drum (30), the size around the drum can be reduced, and as a result, the magnetic recording / reproducing device can be downsized.

Further, in this embodiment, since the external connection connector (20) of the bobbin (7) is integrally formed, it is possible to shorten the length of the terminal of the coil conductor wire, so that disconnection defects and the like are drastically reduced and the yield is reduced. Improves reliability. Further, the terminal treatment can be performed immediately after winding the coil conductor, which facilitates handling. Furthermore, by inserting and fitting the external connector (21) into the connector parts (16b) and (17b), the wiring connection can be completed easily, and therefore the number of steps required for assembly and wiring can be greatly reduced. Furthermore, since the number of parts can be reduced, it is also advantageous in terms of material cost.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and it goes without saying that various structures can be adopted without departing from the spirit of the present invention.

For example, as shown in FIG. 7, the winding part (3
The winding width m of 1) may be formed larger than the gap n between the connecting portions (32) and (33) to secure the winding space of the coil conductor. That is, for example, each flange part (1
2) and (13) are thinly formed to secure a winding width m, and the base portion (32a) of the external connection connector (20),
The (33a) may be formed so as to spread toward the winding section (31).

If the winding width m is made larger than the gap n between the connecting portions (31) and (32) to secure the winding space, the size of the bobbin can be reduced due to the demand for further downsizing of the magnetic head device. Even if the pitch of the connecting pins becomes narrower, a sufficient number of windings can be secured by using a conventional wire (thick wire). Therefore, the insulation of the coil conductor and the reliability against disconnection can be maintained, and the DC resistance of the winding can be suppressed to a low level, so the temperature rise during operation can be controlled and the Q can be improved to improve the simplification of the starting circuit. Can be achieved.

Alternatively, as shown in FIG. 8, each connecting portion (41), (4
It is also possible to use a bobbin having a structure in which the connecting pins (43) and (44) bent into a substantially L shape are planted in 2). In this case, the connector parts (43b) and (44b) fitted with the external connector are located parallel to the guide parts (41b) and (42b), and the ends of the coil conductors are the connector parts (43b) and (44b). Is processed at the winding connection parts (43a) and (44a) that project in the orthogonal direction.

With such a structure, there are advantages such as facilitating the terminal treatment work of the coil conductor, especially the fixing work by soldering. In addition, as described above, the connection pins (43), (4
Even if 4) is L-shaped, it does not hinder miniaturization around the drum.

[Effect of device]

As will be apparent from the above description, in the present invention, the external connection connector is divided into two parts, and the connection part in the divided two parts is integrally formed on both flange parts of the bobbin.
It is easy to handle, and the number of assembly and wiring steps is greatly reduced. Further, since the coil conductor can be terminated immediately after being wound, the disconnection defect and the like are drastically reduced, the yield is improved, and the magnetic head device having excellent reliability can be provided.

Further, since the external connector is inserted from the side surface side of the magnetic head device, the head device can be made thin, and at the same time, the size around the dot can be reduced. Therefore, the present invention greatly contributes to miniaturization of the magnetic recording / reproducing apparatus.

Further, since the terminal treatment of the coil conductor is made offline, the assembly of the magnetic head device can be automated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head device to which the present invention is applied with a part cut away, and FIG. 2 is a sectional view taken along the line AA in FIG. 3 to 5 show a bobbin incorporated in a magnetic head device to which the present invention is applied. FIG. 3 is a perspective view seen from the base direction, and FIG. 4 is a perspective view seen from the guide part direction. FIG. 5 is a front view. FIG. 6 is a schematic side view showing the positional relationship between the magnetic head device of the present invention and the drum. 7 and 8 show another embodiment of the present invention.
FIG. 7 is a perspective view showing a bobbin having a large winding width, and FIG.
The figure is a perspective view of a bobbin in which a substantially L-shaped connecting pin is erected. FIG. 9 is a perspective view showing a conventional bobbin, and FIG. 10 is a partial sectional view of a conventional magnetic head device incorporating the bobbin shown in FIG. 1 …… Front core 5 …… Back core 6 …… Coil conductor 7 …… Bobbin 9 …… Mold case 11 …… Winding part 12,13 …… Flange part 14,15 …… Connecting part 16,17 …… Connecting Pin 20: Connector for external connection

Continuation of the front page (72) Koichi Kusano Inventor, Koichi Kusano 6-5-6 Kitashinagawa, Shinagawa-ku, Tokyo Inside Sony Magne Products Co., Ltd. (56) Reference JP-A-59-148116 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A magnetic head device comprising: a magnetic head main body, in which a front core and a back core are joined and integrated, and a coil conductor is wound around a bobbin; and a mold case for housing the magnetic head main body. In the above, the bobbin is composed of a winding portion of the coil conductor and flange portions provided at both ends of the winding portion, and the connecting pins are respectively inserted into the flange portions, and the external connector is provided along the connecting pins. The magnetic head device is characterized in that a guide part for guiding the magnetic head is integrally provided, and the external connection connector for connecting to the external connector is constituted by the connecting pin and the guide part provided in a state of being divided into two. .