JPS6043209A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a strong, high-reliability magnetic head by welding weld zones of magnetic circuit half bodies together by using a laser. CONSTITUTION:A couple of left and right magnetic circuit half bodies 1 and 1 are put opposite to each other across a gap material 10 of a nonmagnetic body so as to form a gap, and abutting parts 1a and 1a are joined together to weld the weld zones A by using the laser. Said joing part is welded by the laser and the run surfaces 12, etc., for a magnetic recording medium 11 are polished and a coil 13 is wound at a specific position to complete the magnetic head.

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a magnetic head in which a pair of left and right magnetic circuit halves constituting the magnetic head are joined together with a gap made of non-magnetic material in between. .

<Prior Art> Generally, a magnetic head is constructed by joining a pair of left and right magnetic circuit halves with a predetermined gap in between, then polishing the running surface of the magnetic recording medium, and winding a coil. In both processes, joining a pair of left and right magnetic circuit half-circuits is a heavy process, such as joining two magnetic circuit half-circuits around which a coil has been wound in advance with a gap in between.

However, in joining the above magnetic circuits,
Mechanical means such as screws and springs are used, adhesives, fillers, etc. are used, brazing methods such as glass and solder are used, or a combination of these methods is used. be.

Therefore, for devices with relatively simple structures, such as the V-T/R recording head, even if a combination of the divine methods described above is adopted, there is a space problem and the optical effect cannot be achieved. There were other difficulties.

In particular, it was necessary to devise measures to protect the beach from external stress and environmental changes.

<A means to eliminate the problem> The present invention has been made to achieve the above object, and is a method in which the welded parts of each half of the magnetic circuit constituting the magnetic head are joined using a laser. The purpose is to use laser welding to join each half of the magnetic circuit, and to obtain a strong and highly reliable magnetic head.

<Example> Hereinafter, an example according to the present invention will be described in detail based on the attached drawings.

1 to 4 are perspective views of the magnetic circuit half-circuit constituting the magnetic head f according to the present invention. In the figures, 1 is a bulk-shaped magnetic circuit half-circuit cut out from a block-shaped magnetic material, and 2 is a 4 is a half-magnetic circuit formed by stacking a large number of thin magnetic plates 3; 4 is a half-magnetic circuit in which a magnetic body 6 is sandwiched and bonded in a Sanderschich shape between upper and lower non-magnetic bodies 5; 7 is a half-half magnetic circuit; Each half of the magnetic circuit is shown in which only one side is a non-magnetic material 8 and the magnetic material 9 is bonded to protect it.

FIG. 5 is an explanatory view showing the manufacturing process of the magnetic head according to the present invention. A welding part A is welded by using a laser by sandwiching the gear scoop 10 of the body and joining the abutting parts 1a and la surfaces.

After laser welding the joint, the running surface 12 of the magnetic recording medium 11 and the like are polished, and the coil 13 is wound at a predetermined position to complete the magnetic head.

<Effects> As described in detail above, in the magnetic head according to the present invention, a pair of left and right magnetic circuit halves are joined so as to sandwich a gap made of non-magnetic material, and the joining of the magnetic circuit halves is welded using a laser. Since the magnetic head has a welded part that is strong and reliable, a strong and highly reliable magnetic head can be manufactured efficiently.

Also, according to laser welding, due to its excellent light focusing ability,
Since the temperature rise in the welded area is extremely localized, changes in quality and degeneration due to welding are extremely small, and the electromagnetic conversion characteristics are the same regardless of whether the magnetic material is in bulk form, a laminate of thin plates, or a thin film. There is no occurrence of chromatic tube.

Furthermore, in a magnetic material whose one or both sides are protected by a non-magnetic material, it is also possible to be on the non-magnetic material.
In addition to being able to join without any problems such as "", the non-magnetic material is transparent at the wavelength of the laser used, and it has the advantage that it is possible to directly weld the magnetic material instead of the non-magnetic material.

[Brief explanation of the drawing]

1 to 4 are perspective views showing an embodiment of a magnetic circuit half-closed according to the present invention, and FIG. 5 is an explanatory diagram showing a manufacturing process of a magnetic head according to the present invention. 1.2.4.7---Magnetic circuit half off, 10...
...Gap material, A...Laser welding patent Applicant: TDC Co., Ltd. Agent
Patent attorney Hideaki Sato

Claims (1)

[Claims] (11) In a magnetic head in which a pair of left and right magnetic circuits constituting a magnetic head are butted against each other and joined so as to sandwich a non-magnetic material in the gap, each of the magnetic circuits is partially closed using a laser. (2) The magnetic head according to claim 11, wherein each of the magnetic circuit half-circuits is a magnetic material. (3) Each half of the magnetic circuit described above is a magnetic material sandwiched between transparent non-magnetic materials at the laser wavelength used, or a magnetic material whose only one side is covered with a transparent non-magnetic material. A magnetic head according to claim (1), characterized in that: