JPS63161510A - Composite magnetic head - Google Patents

Abstract

PURPOSE:To improve the practicality, reliability and mass-productivity by making a core block length from a gap of a recording/reproducing head till a nonmagnetic member from a core block length from a gap of an erasure head till the nonmagnetic member so as to easily confirm the distinction of each head. CONSTITUTION:The core block 4b and the core block 9b of the recording/ reproducing head 1 and the erasure head 6 are formed in a way that the length of the former is longer than the latter. The nonmagnetic member bonding the recording/reproducing head 1 and the erasure head 6 is biased to either magnetic head and the asymmetry is confirmed easily in a composite magnetic head single body. Thus, the composite magnetic head with high reliability, practicality and mass-productivity is manufactured without changing the conventional processing technology.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a magnetic head used for recording and reproducing information on, for example, a floppy disk.

(Prior Art) An advanced wide erase type composite magnetic head is known as a composite magnetic head used for recording and reproducing on a floppy disk.

As shown in FIGS. 3, 4(a) and 4(b), the recording/reproducing head 1 of this composite magnetic head has a coil groove 2, a track regulating groove, and a glass bonding groove 3 machined with high precision. A first core block 4a made of a processed magnetic material such as ferrite, and a second core block 4b made of the same material and having track regulation grooves and glass bonding grooves 3 formed in the same manner are arranged facing each other, SiO2 on the opposite surface,
A gap 5 is formed by sputtering a non-magnetic material such as Zr 02, and the two are glass-welded.

On the other hand, the erase head 6 also has a first core block 9a made of a magnetic material such as ferrite, which is formed by highly accurate machining of the coil grooves 7, track regulating grooves, and glass bonding grooves 8.
and a second core block 9b made of the same material in which track regulating grooves and glass bonding grooves 8 are formed in the same way are arranged facing each other, and a non-magnetic material such as Si 02 or Zr 02 is sputtered on the opposing surfaces to form a gap 10. It is constructed by welding glass so that it is formed.

The recording/reproducing head 1 and the erasing head 6 are formed symmetrically on the left and right, and are bonded with a bonding agent such as glass through a non-magnetic plate 11 located at the center, indicated by A-A', to form a composite magnetic head. be done. On both sides of this composite magnetic head, a non-magnetic holder 12 made of a non-magnetic material such as ceramic, and a non-magnetic holder 14 having a groove 13 are arranged with high precision and bonded together with a bonding agent. Furthermore, excitation coils 15.16 are wound around the winding grooves 2.7 provided in both heads 1.6, thereby forming a leading wide erase head.

In such a conventional composite magnetic head, as shown in FIG. 4, the gap distance between the recording/reproducing head 1 and the erasing head 6 and the lengths Ll and L2 of the second core blocks 4b and 9b are determined. The external dimension B is set with high precision, and the non-magnetic holder 1 is attached to the single composite magnetic head during the manufacturing process.
2.14, since the groove 13 provided in the non-magnetic holder 12 is provided on the inner peripheral side of the recording medium, it is necessary to confirm the direction when attaching this composite magnetic head alone.

(Problem to be Solved by the Invention) However, as shown in FIG. 4, in a single composite magnetic head, the recording/reproducing head 1 and the erasing head 6 are constructed with the same shape, so the two heads cannot be distinguished in the manufacturing process. There has been a problem in that it is very complicated to check. In other words, this distinction has conventionally been confirmed using an optical microscope, marks placed on the external shape of the magnetic head, or marks on the sliding surface of the magnetic head, but both methods take time to measure, increase the number of steps, and hinder mass production. There was a problem of lowering the .

The present invention has been made in response to the above-mentioned circumstances, and its purpose is to improve the basic structure of a single composite magnetic head, that is, without changing the distance between the gaps between the recording/reproducing head and the erasing head. An object of the present invention is to provide a composite magnetic head in which the distinction between the two types can be easily confirmed.

[Structure of the Invention] (Means for Solving the Problems) A composite magnetic head of the present invention is a composite magnetic head in which a non-magnetic member is interposed between a recording/reproducing head and an erasing head and is fixed integrally with a V. The core block length from the gap of the recording/reproducing head to the non-magnetic member is different from the core block length from the gap of the erasing head to the non-magnetic member.

(Function) In the single composite magnetic head of the present invention, the non-magnetic member that joins the recording/reproducing head and the erasing head is brought to the side of one of the magnetic heads, so that the asymmetry thereof can be easily recognized. Therefore, a highly reliable, practical, and mass-producible composite magnetic head can be manufactured without changing conventional processing technology.

(Example) The present invention will be described in detail below with reference to the drawings.

In the following figures, parts corresponding to those in FIGS. 3, 4(a), and 4(b) are designated by the same reference numerals as those in these figures, and redundant explanation will be omitted.

As shown in FIGS. 1(a) and 1(b), the single composite magnetic head of this embodiment has a first core made of a magnetic material and having a coil groove 2, a track regulating groove, and a glass bonding groove 3. The block 4a and a second core block 4b made of the same material and having track regulation grooves and glass bonding grooves 3 formed in the same manner are arranged facing each other, and a gap 5 is formed by sputtering a non-magnetic material on the opposing surfaces. It is constructed by welding the two together with glass.

On the other hand, the erase head 6 also includes a first core block 9a made of a magnetic material having a coil groove 7, a track regulation groove and a glass bonding groove 8, and a first core block 9a made of the same material and having a track regulation groove 111 and a glass bonding groove 8 formed in the same manner. 2 core block 9b
are placed facing each other, and a non-magnetic material is sputtered on the opposing surfaces to form a G1? It is constructed by welding glass so that a tip 10 is formed.

In this embodiment, the core blocks 4b and 9b of the recording/reproducing head 1 and the erasing head 6 are formed so that the length of the core block is longer than that of the latter.

In other words, the distance between the gaps required for this composite magnetic head alone is 700 μm, and the thickness of the bonding plate 11 is 200 μm.
For example, when the length Ll of the core block 4b is 3
50 μm 1 Length Ll of core block 9b 150
Set it to μm. In the embodiment configured as described above, the gap distance and outer diameter dimension B of the conventional composite magnetoresistive head are unchanged, and the length of the core block 4b and the core block 9b are unchanged.
The recording/reproducing head 1 and the erasing head 6 can be distinguished at a glance from the difference in length.

In this embodiment as well, a non-magnetic holder made of a non-magnetic material such as ceramic and a non-magnetic holder having grooves are arranged with high precision on both sides of the composite magnetic head and are bonded with a bonding agent. Excitation coils 15 and 16 are wound around the winding grooves 2 and 7 provided in the winding grooves 2 and 6, thereby forming a leading wide erase head.

2(a) and 2(b) show another embodiment of the present invention, in which the length Ll of the core block 4b on the recording/reproducing head 1 side is the same as the length Ll of the core block 4b on the erasing head 6 side. It is formed to be longer than the length Ll of the block 9b. In this embodiment as well, the recording/reproducing head 1 and the erasing head 6 can be distinguished at a glance from the difference in length between the core block 4b and the core block 9b.

In addition, although the above embodiment describes an example in which the present invention is applied to a preceding wide erase head, the present invention is not limited only to such an embodiment, and may be modified without departing from the gist of the present invention. It can also be applied to a composite magnetic head.

[Effects of the Invention] As explained above, according to the composite magnetic head of the present invention,
Since the lengths of adjacent core blocks are made different through the non-magnetic members of the recording/reproducing head and the erasing head, the position of the recording/reproducing head or the erasing head can be easily seen with the naked eye from the position of the non-magnetic member. Practicality, reliability, and productivity can be improved without changing conventional processing technology.

[Brief explanation of the drawing]

FIG. 1(a) is a perspective view of an embodiment in which the joint member of a single composite magnetic head of the advanced wide erase type is moved closer to the erasing head side, FIG. 1(b) is a plan view thereof, and FIG. 2(a)
3 is a perspective view of a single composite magnetic head of an embodiment in which the joint member of a single composite magnetic head of the advanced wide erase type is moved closer to the recording/reproducing head side, FIG. 3(b) is a plan view thereof, and FIG. FIG. 4(a) is a perspective view of a single composite magnetic head, and FIG. 4(b) is a plan view of the single composite magnetic head. 1... Recording/playback head 2...
......Coil groove 3.8...Track regulation groove and glass bonding groove 4a19a...First core block 4b, 9b...Second core block 5.10 ···gap

Claims (2)

[Claims] (1) In a composite magnetic head in which a non-magnetic member is interposed between the recording/reproducing head and the erasing head and they are fixed together,
A composite magnetic head characterized in that the core block length from the gap of the recording/reproducing head to the non-magnetic member and the core block length from the gap of the erasing head to the non-magnetic member are different from each other. (2) The composite magnetic head according to claim 1, wherein the gap between the recording/reproducing head and the gap between the erasing head is sufficient to prevent crosstalk.