JPH05298607A - Magnetic head - Google Patents

Abstract

PURPOSE:To decrease the number of components of the magnetic head which is used for a magnetic tape recorder, a magnetic card reader, etc., and also reduce its size by incorporating magnetic cores which are almost in a channel shape integrally in a rectangular holding frame although two holding frames are conventionally fitted with the nearly channel-shaped magnetic cores and fixed with screws. CONSTITUTION:The magnetic cores 2 which are almost in the channel shaped and have high specific magnetic permeability characteristics are assembled on a bobbin 1 formed by providing a core barrel part 2a with winding 8, and inserted and incorporated in the rectangular holding frame 9 made of a nonmagnetic material, and the magnetic cores and rectangular holding frame are frazed; and the rectangular holding frame is incorporated in a metallic shield case 6 which has high specific magnetic permeability characteristics, filling resin 7 is charged, and the butting surfaces of the magnetic cores 2 are ground into an R surface, thus constituting the magnetic head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a magnetic tape recorder,
The present invention relates to a magnetic head used for a magnetic card reader or the like.

[0002]

2. Description of the Related Art The structure of a conventional general ring type magnetic head is as shown in FIG. 2, and is made of a resin molded product having a winding 8 preliminarily applied thereto as shown in FIG. A bobbin 1 and two magnetic cores 2 made of metal or ferrite having a substantially C-shaped high relative magnetic permeability characteristic are housed in respective holding frames 3 made of non-magnetic metal or resin. The magnetic gap member 4 which is usually made of a thin metal plate is interposed between the head abutting portions of the two holding frames 3 which house the magnetic cores 2, respectively, and the two screws 5 are passed through the one holding frame 3. The screw 5 is screwed into the other holding frame 3 and tightened to form a magnetic head element, the magnetic head element is housed in the shield case 6, and the inside is filled with the embedding resin 7. This assembled product is a magnetic head completed by polishing the surface of the magnetic gap portion into an arc shape as shown in FIG.

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The abutting of the magnetic cores attached to the holding frame is screwed to the abutting portion of the head using two screws with a magnetic gap material interposed, and the two holding frames are attached. For this reason, the conventional magnetic head with the fixed head has to use two holding frames and two screws, has a large number of parts and is large in shape, and is not suitable for downsizing.

[0004]

According to the present invention, two holding frames for holding the magnetic core are combined into a single unit, and a magnetic gap member is interposed between the head butting portions to fix the magnetic core. A holding frame, and by brazing the magnetic core to the square-shaped holding frame, the two magnetic cores are made to abut each other without using screws, housed in a shield case, and the inside is filled with embedded resin. The surface of the magnetic gap portion is polished into an arc shape to obtain the magnetic head of the present invention.

That is, according to the present invention, two substantially C-shaped magnetic cores having a high relative magnetic permeability characteristic are incorporated in a resin bobbin having a core core body having a winding, and each of the magnetic cores is held. And a holding frame held by the holding frame, the magnetic core being inserted and abutted with a magnetic gap material made of a non-magnetic material, and the magnetic core, the holding frame, and a shield case made of a metal soft magnetic material. In a magnetic head formed by polishing the magnetic gap side of R to the R surface, a square bracket with a brazing part of a conductor is provided at the joint with the magnetic core such as epoxy glass made of a non-magnetic material or a metal plate. The magnetic head is characterized in that the magnetic core is incorporated and brazed and fixed to a holding frame, and the magnetic gap portions of the magnetic core are butted against each other.

[0006]

In the case of the magnetic head of the present invention, the two magnetic cores are fixed to each other by brazing them to a square-shaped holding frame such as one non-magnetic metal or glass epoxy plate and abutting each other. For this reason, the number of parts can be reduced by one holding frame and two screws, and the structure is simplified, which facilitates miniaturization.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is an exploded perspective view of the essential part of an embodiment of a magnetic head of the present invention. The two magnetic cores 2 made of sendust block, laminated permalloy, soft magnetic ferrite, or the like are substantially C-shaped magnetic cores, and the winding 8 is preliminarily applied to the core body portion 2a of the resin bobbin 1. . In the square-shaped holding frame 9, the magnetic head element obtained by inserting the magnetic gap member 4 made of a non-magnetic material into the head-butting portion of the magnetic core 2 and abutting the magnetic head element is shown in FIG. 1) Inserted as shown in FIG. 1B, and brazed between the magnetic core 2 and the brazing portion 2b of the square-shaped holding frame 9 as shown in FIG. Then, as shown in FIG. 1 (d), it is housed in a shield case made of permalloy or the like, the inside is filled with an embedding resin 7, and the surface on the magnetic gap side is polished into an arc shape to obtain a finished product.

[0008]

According to the magnetic head of the present invention, two magnetic cores are brazed and fixed to one holding frame having a square V shape, and a magnetic gap material is inserted in the butting portion to hold the square V shape. The magnetic core is fixed in a frame, then housed in a shield case, and the shield case is filled with resin to form a magnetic head.The number of parts is smaller than in the past, and the structure is simplified and the magnetic head is small and inexpensive. You can do it.

[Brief description of drawings]

1 is a view showing a magnetic head according to the present invention, FIG. 1 (a) is a perspective view in which two magnetic cores are incorporated in a core body of a wound bobbin, and FIG. 1 (b) is A perspective view of the magnetic core with a bobbin assembled to the holding frame. Fig. 1 (c) is a perspective view of the magnetic core brazed and fixed to the holding frame. Fig. 1 (d) shows a magnetic core with the holding frame attached to the shield case. FIG. 3 is an external perspective view of a magnetic head according to the present invention, in which an embedded resin is filled and a sliding surface of a magnetic tape is polished into an R surface.

2 is an external perspective view of a conventional magnetic head, FIG. 2 (a) is an external perspective view in which a winding is applied to a core body of a bobbin and a magnetic core is incorporated and assembled in a holding frame; b)
Is an external perspective view of the completed magnetic head.

[Explanation of symbols]

 1 Bobbin 2 Magnetic Core 2a Core Body 2b Brazing Part 3 Holding Frame 4 Magnetic Gap Material 5 Screw 6 Shield Case 7 Embedded Resin 8 Winding 9 Square-shaped Holding Frame

Claims (1)

[Claims] 1. A holding frame for holding two respective substantially C-shaped magnetic cores having a high relative magnetic permeability characteristic in a resin bobbin having a central core body having a winding. A magnetic gap of the holding frame, the magnetic core being held by the holding frame, the magnetic core being inserted and abutted with a magnetic gap material made of a non-magnetic material, and the magnetic core, the holding frame, and a shield case made of a soft metal magnetic material. In a magnetic head formed by polishing the side to the R surface, epoxy glass made of non-magnetic material with a conductor brazing part provided at the joint with the magnetic core, or a square-shaped holding of a metal plate, etc. A magnetic head, characterized in that the magnetic core is assembled and brazed and fixed to a frame, and the magnetic gap portions of the magnetic core are butted against each other.