JPH0732704U - Magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the process of attaching the L-shaped erasing back bar between the ends of the central leg portion and the one end side leg portion of the composite core member, and improve the attaching accuracy. [Structure] A step 3 in which one piece portion 5a of an L-shaped erasing back bar 5 is provided on a side portion 3a of a central leg portion 3 of a composite core member 1.
the other end portion 5b to the upper end surface 2a of the leg portion 2 on the one end side.
After positioning to, the portion where the other piece portion 5b and the one end side leg portion 2 are in contact is fixed with an adhesive.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic head used in a floppy disk device or the like.

[0002]

[Prior art]

 A magnetic head used in a general floppy disk device is called a tunnel erase head, and a typical structure of its main part is shown in FIG. Reference numeral 1 denotes a composite core member forming a core portion of the tunnel razor head, which is called a laminate type, and is provided with three legs 2, 3 and 4 and formed into a flat E-shape.

There are two erasing gaps in the portion connecting the central leg 3 and the one leg 2 and a recording / reproducing gap in the portion connecting the central leg 3 and the other leg 4 There is. An erasing coil 7 is mounted around the leg 2 on one end side of the E-shaped composite core member 1, and an L-shaped erasing back bar 5 is mounted between the ends of the leg 2 and the central leg 3. The magnetic circuit of the erasing head.

Similarly, a recording / reproducing coil 8 is mounted around the leg 4 on the other end side of the E-shaped composite core member 1, and a recording / reproducing back bar is provided between the leg 4 and the end of the central leg 3. A magnetic circuit of the recording / reproducing head is constructed by mounting -6.

A ceramic slider is joined so as to sandwich the peripheral portion of the composite core member 1 from both sides, and the ceramic slider is attached to the gimbal plate. The ceramic slider and the gimbal plate are shown in FIG. The description in this specification is omitted.

The L-shaped erasing back bar 5 is a component in which a ferromagnetic material plate is L-shaped, and one piece portion 5a thereof is connected to the side end surface 3c of the central leg portion 3 and the other piece portion 5b is connected to the leg portion 2 on one end side. After positioning by hitting against the upper end surface 2a of the L-shaped erasing back bar 5, the other part 5b of the L-shaped erasing part and the part where the leg part 2 on the one end side are in contact are fixed with an adhesive. There is no holding function, so hold the posture by some means until the adhesive cures.

[0007]

[Problems to be solved by the device]

 However, in such a conventional magnetic head, in the assembly process, one piece portion 5a of the L-shaped erasing back bar 5 is attached to the side end surface 3c of the central leg portion 3 of the composite core member 1 and the other piece portion 5b is attached to the composite core. There is a problem that it is very troublesome to position and fix the upper end surface 2a of the leg portion 2 on one end side of the member 1 with an adhesive, and it is difficult to improve the accuracy of the mounting position.

In the example as shown in FIG. 4, one piece portion 5a of the L-shaped erasing back bar 5 is connected to the side end surface 3c of the central leg portion 3 and the other piece portion 5b is connected to the upper end surface of the leg portion 2 on one end side. It is positioned to 2a, and the part where the other piece part 5b and the leg part 2 on the one end side are in contact is fixed with an adhesive. However, since there is no function to maintain the posture in the positioning state, until the adhesive cures, If the L-shaped erasing back bar 5 is not securely held by some means, the L-shaped erasing back bar 5 will be fixed in a state displaced from the normal position.

Therefore, the bonding process of the L-shaped erasing back bar 5 becomes very troublesome, and if an attempt is made to simplify this process, the L-shaped erasing back bar 5 will be misaligned and the erase characteristics will be improved. Getting worse.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide an L-shaped erasing back bar 5 at the central leg portion 3 and one end side of the composite core member 1. Another object of the present invention is to provide a magnetic head having a structure that can be easily and accurately attached between the ends of the legs 2.

[0011]

In order to achieve the above object, in the present invention, the stepped portion of the protrusion is provided on the side of the central leg of the composite core member to position the L-shaped erasing back bar. The structure is used to maintain the posture. Further, a stepped portion is also provided on the upper end of the leg portion on one end side of the composite core member for positioning, or a groove for fitting to the side portion of the central leg portion of the composite core member is provided in one piece of the L-shaped erasing back bar. It is also possible to fit and position the groove on the side of the central leg.

[0012]

[Action]

 According to the present invention having the above-mentioned structure, the step of receiving the step formed on the side of the central leg of the composite core member and the upper part of the leg on the one end side and the groove formed in one piece of the L-shaped erasing back bar are used. The L-shaped back bar for erasing can be easily positioned. Also, since the posture can be held securely after positioning, it is not necessary to hold the L-shaped erasing back bar until the adhesive hardens even if it is fixed by the adhesive.

[0013]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the structure of a magnetic head according to a first embodiment of the present invention. The protrusions are provided on the side portions 3a of the central portion sandwiched from both sides of the three core members forming the central leg portion 3 of the composite core member 1 to form the step 3b, and the L-shaped erasing back bar 5 is provided. A positioning receiver is provided.

An L-shaped ferromagnetic backing plate 5 for erasing one piece 5a is placed on the step 3b, and the other piece 5b is placed on the upper end surface of the leg 2 on one end side of the composite core member 1. Position it on 2a. A portion where the other piece portion 5b of the L-shaped erasing back bar 5 contacts the leg portion 2 on one end side of the composite core member 1 is fixed by an adhesive.

In the second embodiment shown in FIG. 2, in the first embodiment described above, a protrusion is provided on the side portion 3a of the central leg portion 3 of the composite core member 1 to attach the step 3b to the L-shape. Although the erasing back bar 5 is positioned, a step 2c is also provided on the upper portion of the leg portion 2 on one end side of the composite core member 1, and the one-piece portion 5a of the L-shaped erasing back bar 5 is provided at the central leg portion. 3 to the receiving of the step 3b of the projecting portion of the side portion 3a, and the other piece 5b to the receiving of the step 2c attached to the upper portion 2b of the leg 2 on the one end side. The portion where the one-sided portion 5b contacts the leg portion 2 on the one end side of the composite core member 1 is fixed with an adhesive.

FIG. 3 shows a third embodiment. (A) is a perspective view in which one piece portion 5a of an erasing backbar 5 having an L-shaped ferromagnetic plate is provided with a groove 5c to be fitted to the side portion 3a of the central leg portion 3 of the composite core member 1. Is. The L-shaped erasing back bar 5 having the groove 5c is attached to the central leg portion 3 and the one end side leg portion 2 of the stepped composite core member 1 described in the first and second embodiments. That is, the L-shaped erasing back bar, which is a component common to the first and second embodiments, is replaced with the L-shaped erasing back bar having the groove 5c.

FIG. 3B shows an example in which the L-shaped erasing back bar having the groove 5 c is combined with the composite core member described in the second embodiment. The groove 5c formed in the one-piece portion 5a of the L-shaped erasing backer 5 is fitted to the side end surface 3a of the central leg portion 3 provided with the receiver of the step 3b, and the other end 5b is positioned. The positioning is performed on the step 2c provided on the upper portion 2b of the leg portion 2 on the one end side. The other portion 5b of the L-shaped erasing back bar 5 is fixed with an adhesive at a portion in contact with the leg portion 2 on one end side of the composite core member 1.

Although not shown, when the L-shaped erasing back bar having the groove 5c is combined with the first embodiment, the one-piece portion 5a of the L-shaped erasing back bar-2 having the groove 5c is located at the center. The positioning of the leg portion 3 on the step 3b is similar to that described in FIG. 3 (b), but since the other piece portion 5b is not attached to the leg portion 2 on one end side in FIG. As shown, the other piece portion 5b is placed on the upper end surface 2a, positioned, and the contacting portion is fixed with an adhesive.

It should be noted that the step 3b of the protruding portion of the side portion 3a of the central leg portion 3 of the composite core member 1 described in the embodiment of FIGS. Although only the central portion sandwiched from both sides of the core member is projected to form the step, both side portions may be projected to project in the same manner as the central portion.

As is clear from the above embodiments, the step 3b of the protrusion provided on the central leg 3 of the composite core member 1 and the step 2c attached to the leg 2 on one end side are received. The L-shaped erasing back bar-2 and the groove 5c that can be attached to it can be configured in various ways. Positioning is easy and the posture can be maintained reliably, and it can be fixed in the correct position, thus improving the mounting position accuracy. However, it is not necessary to press the L-shaped erasing back bar by other means until the adhesive is hardened.

[0021]

[Effect of device]

 As described above in detail, when the stepped portion of the protruding portion is attached to the central leg of the composite core member, the L-shaped erasing back bar is positioned on the stepped portion and fixed with adhesive. As a result, the L-shaped erasing backbar can be attached in a simpler process and the posture can be reliably maintained, and the mounting position accuracy is improved, so that stable erase characteristics can be obtained.

That is, high-performance magnetic heads having uniform characteristics can be mass-produced efficiently. In addition, positioning or fixing is not possible when a step is attached to the leg on one end side of the composite core member or when a groove that fits in the center leg is attached to one piece of the L-shaped erasing back bar. It becomes more reliable and the grooved structure eliminates lateral displacement.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a main part of a magnetic head according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a structure of a main part of a magnetic head according to a second embodiment of the present invention.

3A is a perspective view of a grooved L-shaped erasing back bar, and FIG. 3B is a perspective view showing a configuration of a main part of a magnetic head according to a third embodiment of the present invention.

FIG. 4 is a perspective view showing a configuration of a main part according to a conventional example.

[Explanation of symbols]

 1 composite core member 2 leg part 2a upper end face 2b upper part 2c step 3 leg part 3a side part 3b step 3c side end face 4 leg part 5 erasing back bar 5a one piece part 5b other part 5c groove 6 recording and reproducing back bar 7 erasing Coil 8 Recording / playback coil

Claims (3)

[Scope of utility model registration request] 1. An E-shaped flat composite core member, an erasing coil mounted around one end side leg of the composite core member, and one end side end and a central leg end of the composite core member. An L-shaped erasing back bar as a yoke arranged between
A recording / reproducing coil mounted around the other end side leg of the composite core member, and a recording / reproducing coil mounted so as to bridge between the other end side leg and the end of the central leg of the composite core member. A magnetic head having a recording / reproducing back bar as a yoke, characterized in that a step is formed on a side portion of a central leg portion to serve as a receiver for holding a positioning posture of an L-shaped erasing back bar. head. 2. The magnetic head according to claim 1, wherein a step is formed on an upper portion of the leg portion on one end side of the composite core member to form a receiver for positioning the L-shaped erasing back bar. 3. A piece of L-shaped erasing back bar,
3. The magnetic head according to claim 1 or 2, wherein a groove is formed on the side of the central leg of the composite core member to position the L-shaped erasing back bar.