JPH0636483Y2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a dielectric type magnetic head for magnetically recording or reproducing information by slidingly contacting a magnetic core with a magnetic recording medium such as a magnetic tape or a magnetic card. It is a thing.

[Prior Art] According to a general structure of this type of magnetic head, a magnetic core wound with a coil is fitted and fixed to a shield case that constitutes an exterior of the magnetic head and shields external noise. It The magnetic core is held in the shield case by a core support which is a magnetic core holding member.

In such a magnetic head, it is necessary to ground the magnetic core to prevent electrostatic noise. For this reason, many conventional magnetic heads do not have a special ground terminal structure. In that case, the structure is such that the ground wire is soldered to the shield case, or the screw for the magnetic head mounting member mounted to the shield case. The structure is used to take the ground by using the. Further, when the ground terminal is provided, the magnetic core and the ground terminal are connected by soldering or spot welding.

[Problems to be Solved by the Invention] However, the conventional ground structure for a magnetic head as described above has the following drawbacks. First, in the case of the structure in which the ground wire is soldered to the shield case without providing the ground terminal, soldering is poor due to the material of the shield case, and the reliability of the connection of the ground wire is low. Also, the heat generated during soldering may cause distortion in the structure inside the shield case,
Due to the adverse effect of heat on the resin or other adhesive that fixes the magnetic core, the dimensions of the magnetic cap of the magnetic core may change, and problems such as poor conduction between the magnetic core, core support, and shield case may occur. is there. Also, in the case of a structure in which a ground terminal is specially provided, the number of parts increases by the amount of the ground terminal, and the number of steps in the assembly process increases,
The cost will increase considerably.

Therefore, an object of the present invention is to provide a structure capable of reliably grounding the magnetic core in the above-mentioned magnetic head without increasing the cost.

[Means for Solving the Problems] According to the present invention to solve the above problems, in a magnetic head having a holding member for holding a magnetic core in an outer case of the magnetic head, the holding member is made of a conductive material. In addition, a structure is adopted in which a part of the holding member is extended to form an extension portion, and the extension portion serves as a ground terminal for grounding the magnetic core.

[Operation] According to such a structure, since the ground terminal is an extension of the holding member of the magnetic core and is integral with the holding member, the number of parts of the magnetic head is smaller than that when the ground terminal is provided as a separate part. Can be reduced, and the number of assembling steps can be reduced. Further, it is not necessary to connect the magnetic core and the ground terminal by soldering or the like, assuming that the holding member of the magnetic core is made of a conductive material. Therefore, it is possible to avoid adverse effects of heat such as soldering. Even when the ground terminal is connected to an external conductor by soldering, spot welding, or the like, by making the ground terminal largely protrude from the magnetic core holding member, it is possible to suppress adverse effects due to heat at the time of connection.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view illustrating the structure of a magnetic head according to an embodiment of the present invention. In the structure of FIG. 1, first, reference numeral 1 is an outer case for accommodating the constituent members of the magnetic head to form an outer case of the magnetic head and a shield case for shielding external noise. The shield case 1 is made of a ferromagnetic material such as permalloy and a good conductor. In the shield case 1, an opening 1a for exposing the magnetic core is formed in the central portion of the upper surface in the figure which constitutes the magnetic recording medium sliding surface of the magnetic head.

Further, reference numerals 2 and 2 ′ are magnetic core halves each made of a ferromagnetic material, which are joined together via a magnetic gap 3 to form a magnetic core. A coil bobbin 6 around which the coil 5 is wound is fitted to the rear end of the magnetic core. Terminals 7, 7 to which both ends of the coil 5 are connected are planted in the coil bobbin 6.

Reference numerals 4 and 4'indicate core supports which are magnetic core holding members for holding the magnetic cores. The core supports 4, 4'are made of a good non-magnetic conductor, and the magnetic core halves 2, 2'are respectively formed.
Convex portions 4a, 4b and 4a ', 4b' for holding the are projected. As shown in FIG. 2, one core support 4 is provided with a pair of convex portions 4a, 4b to 4a ', 4b' facing each other. The magnetic core half body 2 is held by the core support 4 by press-fitting and fitting the magnetic core half body 2 between the convex portions 4a, 4a and between the convex portions 4b, 4b. Similarly, the magnetic core half body 2'is press-fitted into the core support 4 ', fitted and held.

Further, at the rear end portion of one core support 4 shown in FIG. 2, a ground terminal 4c for grounding the magnetic core is integrally provided with the core support 4 made of a good conductor as a structure related to the present invention. .

With this structure, the assembly of the magnetic core consisting of the magnetic core halves 2, 2 ', the core supports 4, 4', and the coil bobbin 6 is fitted in the shield case 1, and the tip of the magnetic core provided with the magnetic gap 3 is provided. Facing the opening 1a, shield case 1
A magnetic head is constructed by filling an adhesive agent (not shown) made of resin or the like and curing it to fix the above assembly.

Here, the ground terminal 4c projects from the shield case 1 together with the terminals 7 and 7, and the magnetic core is grounded via the ground terminal 4c. Since the core support 4 made of a good conductor is in close contact with the magnetic core, the magnetic core can be surely grounded via the ground terminal 4c integral with the magnetic core. The reliability of the ground is high when the ground is taken from the shield case of the conventional example.

If the material of the core support 4 is suitable for soldering, the ground terminal 4c can be designed as both a soldering terminal and a connector terminal. Also, if the material of the core support 4 is not suitable for soldering, the ground terminal
4c can be a connector or spot welding terminal. In any case, by providing the ground terminal 4c, connection with an external conductor for grounding becomes easy and highly reliable, and it is possible to mount a connector or a printed board including the external conductor. Become.

As described above, according to this embodiment, the magnetic core can be reliably grounded via the ground terminal 4c. Since the ground terminal 4c is integral with the core support 4, the number of parts does not increase even if the ground terminal 4c is provided, the number of assembly steps does not increase, and the cost does not increase. Further, since the connection between the magnetic core and the ground terminal is unnecessary, it is possible to avoid the adverse effect of the heat of soldering for the connection. Even if the ground terminal 4c is connected to the outside by soldering or spot welding, the ground terminal 4c projects from the core support 4, so that adverse effects due to heat at that time can be reduced.

[Effects of the Invention] As is apparent from the above description, according to the present invention, in a magnetic head having a holding member for holding a magnetic core in an outer case of the magnetic head, the holding member is formed of a conductive material, Further, since a structure is adopted in which a part of the holding member is extended to form an extended portion and the extended portion is used as a ground terminal for grounding the magnetic core, the magnetic core can be reliably grounded and the magnetic head The number of parts is reduced, the number of assembly steps is reduced, the cost can be reduced, and the adverse effects of heat such as soldering and spot welding for ground connection can be reduced. The effect is obtained.

[Brief description of drawings]

1 is a sectional view showing the structure of a magnetic head according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the structure of the core support shown in FIG. 1 ... Shield case, 2, 2 '... magnetic core half body 3 ... magnetic gap, 4, 4' ... core support 4c ... ground terminal, 5 ... coil 6 ... coil bobbin, 7 ... terminal

Claims (1)

[Scope of utility model registration request] 1. A magnetic head having a holding member for holding a magnetic core in an outer case of the magnetic head, wherein the holding member is made of a conductive material, and a part of the holding member is extended to form an extension portion. The magnetic head is characterized in that the extension is used as a ground terminal for grounding the magnetic core.