JPH01294207A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to simplify the process by projecting both end parts in the track breadthwise direction of a magnetic recording medium slide part of one magnetic core half body along both side edges in the track breadthwise direction of the magnetic recording medium slide part of the other magnetic core half body to suppress the partial wear of an effective track width part of a magnetic core. CONSTITUTION:Both end parts 2a and 2b in the track breadthwise direction of the front end part of a magnetic core half body 2 are so formed that they are projected along upper side edges 2a' and 2a' in the track breadthwith direction of the front end part of the other magnetic core half body 2' at the time of joining magnetic core half bodies 2 and 2'. Consequently, they are formed into one body to function as a mask block which suppresses the partial wear of the effective track width part of the magnetic core, and the partial wear of the magnetic core part is prevented. Thus, the number of parts of the magnetic head is reduced and the process is simplified.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head for magnetically recording or reproducing information on a magnetic recording medium, and particularly relates to a magnetic head formed by joining a pair of magnetic core halves through a magnetic gap. The present invention relates to a magnetic head that magnetically records or reproduces information by bringing a core into sliding contact with a magnetic recording medium.

[Prior Art] This type of magnetic head, especially heads for magnetic card readers and banknote reading, uses resin, rubber, hair, etc. in order to bring the magnetic recording medium into close contact with the magnetic gap of the magnetic head during recording and reproduction. A magnetic recording medium is pressed against a magnetic head with a strong pressing force of about 100 gr to 800 gr by a pressing member configured as a suppressing roller or a suppressing plate. On the other hand, the wear resistance of the magnetic core, shield case, resin, and other components that make up the magnetic recording medium sliding surface of the magnetic head differs, and the amount of wear due to sliding with the medium differs. Uneven wear will occur.

Therefore, in order to prevent the above-mentioned uneven wear in this type of magnetic head, a structure is adopted in which mask blocks made of the same material as the magnetic core are provided on both sides of the magnetic core in the track width direction on the medium sliding surface.

[Problems to be Solved by the Invention] However, in the structure in which the mask block is provided as described above, the number of parts increases by the relatively expensive mask block. Furthermore, it is difficult to accurately position and fix the mask block in the process of assembling the magnetic head, and a large number of man-hours are required. For this reason, there have been problems in that the manufacturing cost of the magnetic head is high and the yield of the magnetic head is poor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure in which the number of parts can be reduced and the manufacturing process can be simplified in a magnetic head provided with a mask block as described above.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, a magnetic core formed by joining a pair of magnetic core halves through a magnetic gap is brought into sliding contact with a magnetic recording medium. In a magnetic head that magnetically records or reproduces information, both ends in the track width direction of the magnetic recording medium sliding portion of one magnetic core half are the same as the ends of the magnetic recording medium sliding portion of the other magnetic core half in the track width direction. We adopted a structure that extends along both side edges of the magnetic core and functions as a mask block to suppress uneven wear of the effective track width portion of the magnetic core.

[Function] According to this structure, the mask block is integrally formed with one half of the magnetic core, so the number of parts can be reduced by the amount of the mask block compared to the conventional example described above. This also eliminates the need for mask block positioning and fixing steps in the manufacturing process.

[Embodiments] Hereinafter, details of embodiments of the present invention will be explained with reference to the attached drawings.

1 to 4 illustrate the structure of a magnetic head for a magnetic card reader according to an embodiment of the present invention. FIG. 1 is a perspective view showing the overall appearance of the magnetic head, and FIG. 2 is an exploded view of the head. FIG. 3 is a perspective view of a magnetic core half that constitutes the magnetic core of the head, and FIG. 4 is a front view of a medium sliding portion of the magnetic core. In the magnetic head of FIG. 1, the surface on the near side in the figure is a medium sliding surface 7 that slides on a magnetic recording medium (not shown) in the direction of arrow A or the opposite direction.

In these figures, reference numeral 1 denotes a shield case, which accommodates and supports the components of the magnetic head and shields external noise.

In the shield case 1, the first
An opening 1a for exposing the magnetic core is formed in the center of the front surface in the figure.

Next, reference numerals 2 and 2' indicate magnetic core halves constituting the respective magnetic cores. As shown in FIG. 3, the tip of one of the magnetic core halves 2, which slides on a medium (not shown), is formed with a recess 2b and is formed into a substantially U-shape. Both ends 2a, 2 in the track width direction of the tip of this magnetic core half 2
a is the magnetic core half 2.2' shown in FIGS. 2 and 4;
In the state where they are joined, the other magnetic core half 2
' upper edge 2a' in the track width direction at the tip.

It is formed to protrude along 2a'.

Further, a coil 5 is wound around the middle part of the magnetic core half 2. Note that the other magnetic core half 2' is formed into a substantially rectangular shape as a whole.

The magnetic core halves 2.2' are joined together as shown in FIG. 2 with the coil 5 wound around the magnetic core halves 2.

That is, the tip of the magnetic core half 2' is fitted into the recess 2b at the tip of the magnetic core half 2, and the magnetic core half 2' is joined to the bottom of the recess 2b via the magnetic gap 4. .

At this time, as shown in FIGS. 2 and 4, both ends 2a, 2a of the magnetic core half 2 and both side edges 2a of the magnetic core half 2' are
', 2a' are configured so that there is a small gap between them. A magnetic core is constructed by joining the magnetic core halves 2° 2' in this manner.

Next, reference numeral 6 denotes a core support for holding the magnetic core, and as shown in FIG. 2, two sets of arms 6a, 6a and 6b for holding the magnetic core.

6b. Furthermore, terminals 3, 3 for connecting both ends of the coil 5 are implanted at the rear end of the core support 6. The magnetic core consisting of the magnetic core halves 2.2' is fitted and fixed between the arms 6a, 6a and the arms 6b, 6b of the core support 6. Also, both ends of the coil 5 are connected to the terminal 3.3.

The assembly of the magnetic core and core support 6 is then fitted into the shield case 1 as shown by the arrow in FIG. The distal end surface of the magnetic core faces the opening 1a, and the above assembly is fixed within the shield case 1 by filling an adhesive such as epoxy resin into the shield case 1. Then, the medium sliding surface 7 shown in FIG. 1 is ground and polished to form a magnetic head.

In the magnetic head constructed in this way, the width of the magnetic core half 2' in the track width direction in the medium sliding portion of the magnetic core shown in FIG. 4 is the effective track width Tw. Recording and reproduction are performed using this effective track width Tw. Here, both ends 2a, 2a of the magnetic core half 2 and both side edges 2a' of the magnetic core half 2'.

2a' is perpendicular to the magnetic gap 4, so it does not act as a so-called pseudo gap and does not affect recording and reproduction, allowing good recording and reproduction.

According to the structure of this embodiment, the magnetic core half 2'
Both sides Q 2 a' in the track width direction.

Uneven wear of the effective track width Tw portion of the magnetic core 2 is suppressed through both ends 2a, 2a of the magnetic core half body 2 in the track width direction extending along 2a'. That is, both ends 2a, 2a of the magnetic core half 2 function as mask blocks. In this way, this embodiment has a structure in which the mask block is integrally formed with the magnetic core half 2, so the number of parts is reduced by the number of parts required for the mask block, compared to the conventional case where the mask block is provided separately from the magnetic core. can be reduced. Also, the mask block is the magnetic core half 2
Since it is integrated with the mask block, there is no need to position and fix the mask block in the magnetic head assembly process.

When joining the magnetic core halves 2.degree. 2', the mutual positional relationship may be made accurate.

As described above, according to this embodiment, the number of parts of the magnetic head can be reduced, the manufacturing process can be simplified, costs can be significantly reduced, and the yield of the magnetic head can be improved.

[Effects of the Invention] As is clear from the above description, according to the present invention, a magnetic core formed by joining a pair of magnetic core halves through a magnetic gap is brought into sliding contact with a magnetic recording medium to magnetically record information. Or, in a magnetic head that performs reproduction, both ends in the track width direction of the magnetic recording medium sliding part of one magnetic core half are on both sides of the track width direction of the magnetic recording medium sliding part of the other magnetic core half. The structure is designed to function as a mask block that protrudes along the magnetic core and suppresses uneven wear on the effective track width portion of the magnetic core, thereby preventing uneven wear on the magnetic core and improving the durability of the magnetic head. At the same time, the number of components of the magnetic head can be reduced, the manufacturing process can be simplified, the manufacturing cost can be significantly reduced, and the yield can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall appearance of a magnetic head according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same head, and FIG. 3 is a perspective view of a magnetic core half that constitutes the magnetic core of the head. 4 are front views of the medium sliding portion of the magnetic core of the same head. 1... Shield case 2. 2'... Magnetic core half 3... Terminal 4... Magnetic gap 5...
・Coil 6...Ki to core support stone 11
'' 4 tan 1 vine 1st day 10th

Claims (1)

[Claims] 1) In a magnetic head that magnetically records or reproduces information by bringing a magnetic core formed by joining a pair of magnetic core halves through a magnetic gap into sliding contact with a magnetic recording medium, the magnetic recording of one magnetic core half A mask in which both ends of the medium sliding section in the track width direction overhang along both edges of the magnetic recording medium sliding section of the other magnetic core half in the track width direction, thereby suppressing uneven wear of the effective track width portion of the magnetic core. A magnetic head characterized in that it is formed to function as a block.