JPH02239410A - Magnetic head device - Google Patents

Abstract

PURPOSE:To eliminate a need using an adhesive and a jig by superposing each extended leg part on the open end part of each core and binding them into one body by contraction of a thermally contractible tube fitted to the superposition part. CONSTITUTION:Thermally contractible tubes 2a, 2b, and 2c are fitted to the superposition part of a head core 11 and an extended leg part 1a, that of a head core 12 and extended leg part 1b, and that of a center core 13 and an extended leg part 1c respectively to temporarily fix a back bar 1. Thereafter, these tubes are heated and contracted to bind them into one body in each part. That is, extended leg parts 1a to 1c of the back bar 1 are pressed and bound to respective cores 11 to 13 of the magnetic head by the contraction of thermally contractible tubes 2a to 2c fitted to respective extended leg parts 1a to 1c of the back bar 1. Thus, a closed magnetic circuit free from magnetic loss is formed without an adhesive which may age or a jig requiring a labor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a means for attaching a back bar for forming a closed magnetic circuit in a magnetic head device. [Prior Art] FIG. 5 is a perspective view showing the mounting state of a conventional magnetic head device used in a magnetic disk device.
l) is the recording/reproducing head core, (12) is the erasing head core, (13) is the center core, (14) is the recording/reproducing coil, (15) is the erasing coil, (1.6)
is a back bar made of a magnetic material such as ferrite, which forms a closed magnetic circuit of each of the head cores (11) and (12) via the center core (13). (17) is a gimbal spring on which each of the above head cores is mounted, and (is) is a head cable that connects each of the above coils (14) and (15) to the FDD main body. [Problems to be Solved by the Invention] Adhesive and a clamping jig are used to fix the back bar in a conventional magnetic head device. Therefore, it takes time for the adhesive to dry, and the jig is There were problems such as the back bar shifting from the specified attachment position due to loosening of the back bar. This invention was made to solve the above problems and aims to eliminate the use of adhesives and jigs. [1! ! Means for Solving Problem i In the case of this invention, the back bar is fixed by shrinking heat shrinkable tubes fitted into its extended legs. [Function] In the case of this invention, each extension leg of the back bar is tightly pressed against each core of the magnetic head by the contraction action of the heat shrinkable tube fitted into each extension leg of the back bar. [Embodiment N] An embodiment of this invention will be described below. That is, in FIG. 1, (11) is the recording/reproducing head core, (12)
) is the head core for erasing. (13) is a center core that is shared by both head cores, (l) is a back bar that forms a closed magnetic circuit for both head cores (l1) and (12) via this center core (13), and this back bar has an extension leg (lg) whose horizontal cross-sectional shape and dimensions are the same as those of each head core and center core.
(lb) and (lc) are provided, and the overall shape is E-shaped. (2a), (2b), and (2c) are heat-shrinkable tubes, and Figure 1 is a perspective view of each of them before being inserted. Figure 2 shows each of the heat shrink tubes (2a) (2b) (
2c) is a perspective view of the state in which the head core (1
A heat-shrinkable tube (2a) is placed at the point where 1) and the extension leg (1a) overlap, a heat-shrinkable tube (2b) is placed at the point where the head core (12) and the extension leg (lb) overlap, and the center core ( 13) and the extension leg (1c), a heat-shrinkable tube (2c) is inserted and the back bar is temporarily fixed, and then heat is applied to these to shrink them so that the respective parts are integrated. Things are getting tighter. In the above embodiment, each extension leg (1) of the back bar (1) is attached to each head core (11) (12) and center core (13).
la) (lb) and (lc) are brought into close contact with each other, and the respective heat shrink tubes (2a), (2b) and (2c) are inserted over these to heat shrink them, and the overlapping parts are tightened. However, as shown in the other embodiments in FIGS. 3 and 4, heat shrink tubes (2a) (2b) and (2c) is inserted and fixed, and then each extension leg (la
) (lb) and (lc) may be inserted into the respective heat shrinkable tubes (2a), (2b) and (2c) and tightened together by the heat shrinkage. In other embodiments, each extension leg (2a) of the back bar
(2b) In the case where the horizontal cross-sectional shape and dimensions of (2c) are configured to be the same as those of each head core and center core to be overlapped, at least the width of each extension leg is the same as that of each head core and center core to be overlapped. It is also possible to make the width the same as the core width. The heat-shrinkable tube may also be composed of a wrapped body of heat-shrinkable tape. [Effects of the Invention] As described above, the magnetic head device of the present invention uses heat-shrinkable tubes to bind each head core, center core, and back bar, thereby eliminating the need for adhesives that may deteriorate and time-consuming work. This has the effect of making it possible to form a closed magnetic circuit with low magnetic loss without using any jigs.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the main part of the magnetic head device of the present invention before a heat shrink tube is attached, FIG. 2 is a perspective view after attachment, and FIGS. 3 and 4 are views of the present invention. A similar perspective view showing another embodiment, FIG. 5 is a perspective view showing a conventional magnetic head device mounted, and FIG. 6 is a perspective view showing a conventional head core and back bar coupling structure. In the figure, (1) is the back bar, (la) (lb)
(lc) is an extension leg, (2a) (2b) (2c) is a heat shrink tube. (ii) is a recording/reproducing head core;
(12) is the erasing head core, and (I3) is the center core.

Claims (1)

[Claims] A back bar forming a closed magnetic circuit of a recording/reproducing head core and an erasing head core via a center core is provided with an extended leg portion having at least the same width as each of the cores, thereby forming the entire body into an E-shape; A magnetic device characterized in that each of these extended leg portions is overlapped with the open end portion of each of the cores, and the portions are tightened together by contraction of heat-shrinkable tubes inserted into each of these overlapping portions. head device.