JP2006031827A - Magnetic head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic head which can decrease the shaving amount of the case in a polishing process compared with before by preparing a positioning means which regulates not only height dimension of a magnetic core, but also the height dimension of the case especially reference position of the holder. <P>SOLUTION: When a prescribed section of a holder 24 is made a reference position C, a positioning means which regulates dimensional of the height direction from the above reference position C to each sliding surface direction of the above case 20 and magnetic cores 13 and 14 is prepared in the above holder 24. That is, since the height dimensions of both of the above case and the magnetic core are positioned on the reference of the holder, variations in height dimension of the above case are suppressed between each of products at assembly time. As a result, at the final process of polishing the sliding surface, reduction of shaving amount of a sliding surface becomes possible in the above case compared with before. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a magnetic head including a magnetic core, a case, and a holder for attaching the magnetic core, and in particular, the case is properly positioned in the height direction with respect to the holder to reduce the polishing amount of the case. The present invention relates to a magnetic head that can be minimized.

  The following patent document 1 (microfilm of Japanese Utility Model Application No. 2-84744 (Japanese Utility Model Application Publication No. 4-45304)) relates to a composite magnetic head composed of a voice / control head and an erasing head, and more particularly, FIG. The state where the core 5 is attached to the connecting member 10 shown in 1 etc. at the core positioning reference position with the case 8 is disclosed.

  Patent Document 2 (Japanese Patent Application No. 62-1066 (Japanese Utility Model Publication No. 63-176907) microfilm) discloses, for example, as shown in FIG. A magnetic head having a member 2, hold cases 3a and 3b for holding the constituent members 1 and 2, a case 4 for storing the hold cases 3a and 3b, and a coupling spring member 5 is disclosed.

As shown in FIG. 3 of Patent Document 2, the standing piece 51 of the coupling spring member 5 is provided with wedge-shaped projections 51a, 51b and an oval projection 51c, and the projections 51a, 51b, 51c press the hold case 3a. Then, the hold cases 3a and 3b are positioned and fixed in the case 4 (page 5, line 6 to line 10, etc. of the specification of Patent Document 2).
Microfilm of Japanese Utility Model Application No. 2-84744 (Japanese Utility Model Application Publication No. 4-45304) Microfilm of Japanese Utility Model No. 62-1066 (Japanese Utility Model Application No. 63-176907)

  FIG. 9 attached to this specification is a partial sectional view of a conventional magnetic head. Reference numeral 1 denotes a case, and a magnetic core 3 in which the magnetic core halves 2 and 2 are joined on the sliding surface 3a side and the joint becomes a magnetic gap G is provided in the case 1.

  The case 1 is provided with a window 1b on the sliding surface 1a, and the magnetic gap G of the magnetic core 3 is exposed from the window 1b.

  A bobbin 4 around which a coil (not shown) is wound is attached to the side of the magnetic core 3 opposite to the sliding surface 3a.

  Further, as shown in FIG. 9, the magnetic core 3 is attached to a holder (corresponding to the connecting member 10 of Patent Document 1 and the hold cases 3 a and 3 b of Patent Document 2) 5, and the holder 5 is located inside the case 1. It is fixedly supported on the wall surface 1c.

  In the structure of the magnetic head shown in FIG. 9, the height dimension h1 from the reference position A to the sliding surface 3a where the magnetic gap G of the magnetic core 3 is located, with the bottom surface 5a of the holder 5 as the reference position A, for example, The height dimension h2 to the surface 3b opposite to the sliding surface 3a where the magnetic gap G is located is appropriately regulated. The length from the sliding surface 3a to the reverse surface 3b in the magnetic gap G is the gap depth Gd, and after attaching the magnetic core 3, the bobbin 4 and the holder 5 in the case 1 as shown in FIG. The magnetic head shown in FIG. 9 is attached to the jig at the reference position A, the jig is rotated from the rotation center B of the jig with a predetermined rotation radius R, and the case 1 and the magnetic core 3 are rotated by a grindstone (not shown). The sliding surfaces 1a and 3a are polished.

  This polishing step is performed in order to keep the length dimension of the gap depth Gd within a predetermined range. For this reason, in the polishing step, the polishing amount is determined so that the gap depth Gd falls within a predetermined dimension. However, the conventional example shown in FIG. 9 and the magnetic heads shown in Patent Document 1 and Patent Document 2 In either case, since the height dimension of the case 2 from the reference position A is not regulated, the following problems occur.

  That is, since the height direction of the case 1 is not positioned at all with respect to the holder 5, in the assembly stage before polishing, the sliding surface 1a of the case 1 from the reference position A serving as a reference in the polishing process. The height dimension up to is easy to vary between products. For this reason, the dimensions in the height direction of the case 2 and the magnetic core 3 are designed from the beginning by considering that the case 2 is considerably cut away. As a result, in the polishing step, the case 1 slides. Since the surface 1a was shaved in a large amount, there was a problem that the polishing process time was long.

  Therefore, the present invention is for solving the above-described conventional problems, and in particular, with respect to the reference position of the holder, a positioning means for regulating not only the height dimension of the magnetic core but also the height dimension of the case is provided, and polishing is performed. It is an object of the present invention to provide a magnetic head capable of reducing the amount of cutting of the case in the process as compared with the conventional case.

The magnetic head in the present invention is
A magnetic core having a magnetic gap formed on the sliding surface side with the magnetic medium;
A magnetic functional member having a coil for inducing a magnetic field in the magnetic core and / or detecting a magnetic field in the magnetic core;
A window is formed that exposes the magnetic gap to the sliding surface, and a case having an opening in which a back surface opposite to the sliding surface is opened,
Attaching the magnetic core, and having a holder fixedly supported on the inner wall surface of the case,
When the predetermined part of the holder is a reference position, the holder is provided with positioning means for restricting the height dimension from the reference position to the sliding surface direction of each of the case and the magnetic core. It is characterized by being.

  Thus, in the present invention, the holder is provided with positioning means for regulating the height dimensions of the case and the magnetic core from the same reference position. That is, since the height dimension of both the case and the magnetic core is positioned on the basis of the holder, variation in the height dimension of the case between the products during assembly is suppressed, and as a result, the final process of polishing the sliding surface Thus, the amount of cutting of the sliding surface of the case can be reduced as compared with the conventional case.

  In the present invention, the positioning means is an uneven fitting portion provided between an inner wall surface of the case and a case-facing surface facing the inner wall surface of the holder, and the case and the holder It is preferable that the case and the holder are positioned by being fitted by the fitting portion. Accordingly, the case and the holder can be positioned by an appropriate and simple method.

  In the present invention, the inner wall surface of the case is provided with a convex portion protruding toward the holder, the upper end portion of the holder is provided with a notch at a position facing the convex portion, and the holder Preferably, the case is inserted into the case from the opening surface side, and the notch is abutted against the convex portion of the case to position the case and the holder. Accordingly, the case and the holder can be positioned by a simpler method.

  Further, in the present invention, at least two or more concave / convex fitting portions are provided, and the holder and the case are fitted by the two or more concave / convex fitting portions, thereby positioning the holder and the case. Is preferred. As a result, the holder and the case can be more accurately positioned. As a result, the magnetic core is accurately positioned in the track width direction with respect to the window of the case.

  In the present invention, an uneven fitting portion is provided between the holder and the magnetic core, and the magnetic core and the holder are fitted by the uneven fitting portion to position the magnetic core and the holder. Is preferably made. Thereby, it is possible to accurately position the magnetic core and the holder.

  In the present invention, the holder is a flat plate material, and the holder is brought into contact with the inner wall surface of the case by a locking member in a state where the case facing surface of the holder is in contact with the inner wall surface of the case. It is preferably fixedly supported. As a result, the holder is appropriately fixed and supported on the case, and as a result, the magnetic core is accurately positioned in a direction perpendicular to the track width direction with respect to the window of the case.

  In the present invention, it is preferable that the reference position is a reference for polishing the sliding surfaces of the magnetic core and the case. Thereby, it is possible to more appropriately reduce the amount of cutting of the case during the polishing process.

  In the present invention, it is preferable that the holder is provided with a leg portion extending in the reverse surface direction on the side opposite to the sliding surface direction, and the bottom surface of the leg portion is set as the reference position.

  In the present invention, the holder is provided with positioning means for regulating the height dimensions of the case and the magnetic core from the same reference position. That is, since the height dimensions of both the case and the magnetic core are positioned with respect to the holder, variation in the height dimensions of the case between the products during assembly is suppressed, and as a result, in the final process of polishing the sliding surface The amount of cutting the sliding surface of the case can be reduced as compared with the conventional case.

  1 is a partial perspective view showing a magnetic head of the present invention, FIG. 2 is a partial cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a component before assembling a case, a holder, a magnetic core half, and a bobbin. FIG. 4 and FIG. 5 are partial cross-sectional views showing the steps for attaching the holder in the case, and FIG. 6 is a partial enlarged cross-sectional view of the magnetic core half and the holder. 7 is a partial cross-sectional view of the magnetic head for explaining the polishing process, and FIG. 8 is a partially exploded perspective view for explaining the shape of the holder having a configuration different from that in FIG.

  2, the magnetic core 18 in the erasing head 11 is omitted from the drawing. In FIGS. 3, 4 and 5, the magnetic core 13 and the bobbin (magnetic functional member) attached to the magnetic core 13 are shown in the drawing. Omitted.

  The magnetic head shown in FIG. 1 is a fixed head for VTR, for example. Here, the Z1-Z2 direction shown in FIG. 1 is “height direction”, the X1-X2 direction is “track width direction”, and the Y1-Y2 direction is “direction orthogonal to the track width direction”. To do.

  As shown in FIG. 1, a magnetic head 13 for recording / reproducing and a magnetic core 14 are attached to a magnetic head 10 at a predetermined interval in the track width direction (X1-X2 direction). The magnetic core 13 is for recording / reproducing audio signals, and the magnetic core 14 is for recording / reproducing control signals.

  As shown in FIG. 1, reference numeral 11 denotes an erasing head, and an erasing magnetic core 18 is mounted on the erasing head 11. The erasing magnetic core 18 is provided at a position aligned with the magnetic core 13 in the Y1-Y2 direction.

  The magnetic head 10 includes a case 20, magnetic cores 13 and 14, a bobbin 22, and a holder 24.

  As shown in FIGS. 2 and 3, the case 20 is a box-shaped member formed of a magnetic material having an opening 28 on the back side (Z2 direction side in the drawing) and having an internal space.

  As shown in FIGS. 1, 2 and 3, the sliding surface 20a of the case 20 is provided with two windows 25, 25 at a predetermined interval in the X1-X2 direction. The window portion 25 penetrates from the sliding surface 20 a to the internal space of the case 20.

  As shown in FIG. 3, the inner wall surface 20 c (one inner wall surface formed by the X1-X2 direction and the Z1-Z2 direction in the drawing) on which the holder 24 abuts, of the inner wall surface of the case 20, Two positioning convex portions 26 and 26 are formed so as to protrude in the inner direction (X2 direction in the drawing) of the case 20 in the X1-X2 direction. The positioning projections 26 and 26 are both formed in the same shape, and the positioning projections 26 and 26 are formed by embossing, for example, and as shown in FIG. A recessed portion 27 is formed on the outer side surface 20d at a position facing each other in the film thickness direction.

  In the embodiment shown in FIG. 3, the positioning convex portions 26 and 26 are formed in a direction parallel to the X1-X2 direction, and the height dimension h7 from the center of the positioning convex portion 26 to the sliding surface 20a of the case 20 is shown. Is regulated to a predetermined dimension (see FIG. 4).

  As shown in FIG. 3, the holder 24 is a flat plate-shaped nonmagnetic member made of brass or the like. The holder 24 shown in FIG. 3 is inserted into the internal space of the case 20 through the opening 28 of the case 20 and is in contact with and fixedly supported on the inner wall surface 20c. Hereinafter, a surface of the holder 24 facing the magnetic core 14 side is referred to as a magnetic core facing surface 24b, and a surface facing the inner wall surface 20c of the case 20 is referred to as a case facing surface 24c.

  The holder 24 is formed with two notches (positioning recesses) 29, 29 formed at the upper end 24a with a predetermined interval in the X1-X2 direction and extending in the Z2 direction in the drawing.

  As shown in FIG. 3, the holder 24 has a positioning projection protruding in the direction of the magnetic cores 13 and 14 (the X2 direction in the drawing, and as described above, the magnetic core 13 is omitted in FIG. 3 in the drawing). 30 and 30 are provided. The positioning protrusions 30 and 30 are both formed in the same shape, and the positioning protrusions 30 and 30 are formed in a direction parallel to the X1-X2 direction. The positioning protrusions 30 are formed by embossing, for example.

  As shown in FIG. 6 (partially enlarged sectional view in which the magnetic core half 14a and the holder 24 are cut in the direction parallel to the Y1-Y2 direction in the Z1-Z2 direction), the positioning protrusion 30 and the Y1-Y2 A recessed portion 31 is formed in the case facing surface 24c facing in the direction.

  As shown in FIG. 3, the holder 24 has two leg portions 32, 32 extending downward from the lower end 24d (Z2 direction in the drawing) at a predetermined interval in a direction parallel to the X1-X2 direction. The core opposing surface 24b and the case opposing surface 24c are formed so as to protrude on the same plane. The two leg portions 32, 32 are both formed in the same shape.

  As shown in FIG. 3, the lower end portion 24d has two notch portions 33 inside the leg portions 32 and 32 in the X1-X2 direction and at a predetermined interval in the illustrated X1-X2 direction. , 33 are formed in the Z1 direction in the figure.

  As shown in FIGS. 3 and 6, the magnetic core half body 14a extends in the Z1-Z2 direction, and extends upward (in the Z1 direction) in the side 35 and tilts in the Y2 direction. The upper portion 36 and the lower portion 37 extending in the Y2 direction from the lower end of the side portion 35 are configured.

  As shown in FIGS. 3 and 6, a positioning recess 34 is formed on a side surface 35a of the side portion 35 of the magnetic core half 14a facing the holder 24 at a position facing the positioning projection 30 formed on the holder 24. Is formed.

  As shown in FIG. 6, the positioning concave portion 34 of the magnetic core half 14 a and the positioning convex portion 30 formed on the holder 24 are concavo-convexly fitted so that the magnetic core half 14 a faces the magnetic core of the holder 24. It is fixedly supported on the surface 24b.

  As shown in FIG. 6, the upper surface 36a of the upper portion 36 of the magnetic core half body 14a is a position that becomes the sliding surface 14c of the magnetic core 14, and the upper portion 36 has the other magnetic core half body 14b of the other magnetic core half body 14b. A facing surface 36b facing the upper portion 36 is formed.

  As shown in FIG. 6, the lower surface 37 of the magnetic core half body 14a is formed with a facing surface 37a facing the lower portion 37 of the other magnetic core half body 14b.

  As shown in FIG. 3, the other magnetic core half 14b is formed, for example, in a contrasting shape with the magnetic core half 14a.

  As shown in FIG. 3, the bobbin 22 is provided with a through hole 22a penetrating the lower portions 37, 37 of the magnetic core halves 14a, 14b, and a coil (not shown) is provided around the through hole 22a. A winding region 22b for winding is provided. The coil is for inducing a magnetic field in the magnetic cores 13 and 14 and / or detecting a magnetic field in the magnetic cores 13 and 14. As shown in FIG. 3, on the bobbin 22, two terminal pins 38, 38 which are electrically connected to the coil extend downward (Z2 direction in the drawing). In the embodiment of FIG. 3, the bobbin 22 and the coil constitute a “magnetic function unit”.

  Hereinafter, a method for attaching the magnetic core 14 to the holder 24 and a method for attaching the holder 24 to the case 20 will be described.

  As shown in FIG. 6, the magnetic core half body 14 a is positioned on the holder 24 by an uneven fitting between a positioning concave portion 34 provided on the magnetic core half body 14 a and a positioning convex portion 30 provided on the holder 24. Fixed.

  At this time, the bottom surface 32a of the leg 32 formed on the holder 24 is a reference position C when the sliding surface 14c of the magnetic core 14 is polished, which will be described later, and from the reference position C to the holder 24. The height dimension h3 to the center of the positioning projections 30 and 30 provided in is formed with a predetermined dimension. Therefore, the height h4 from the reference position C to the upper surface 36a of the magnetic core half 14a, and the lower edge 36b1 of the opposing surface 36b provided on the upper part 36 of the magnetic core half 14a from the reference position C. The height dimension h5 is accurately determined by the concave / convex fitting.

  The magnetic core half 13a is similarly attached to the positioning convex portion 30 provided on the right side of the holder 24 shown in FIG.

  Next, the lower portion 37 of the magnetic core half body 14a is passed through the through hole 22a provided in the bobbin 22 shown in FIG. 3, and the lower portion 37 of the other magnetic core half body 14b shown in FIG. 22a, the opposing surfaces 36b and 37a of the magnetic core halves 14a and 14b are brought into contact with each other to join the magnetic core halves 14a and 14b with resin, glass or the like. A junction between the opposing surfaces 36b and 36b of the upper part 36 of the magnetic core halves 14a and 14b forms a magnetic gap G.

  The bobbin 22 is provided with a protrusion 22c directed toward the notch 33. When the bobbin 22 is attached to the magnetic core half body 14a, the protrusion 22c is unevenly fitted to the notch 33. (See FIG. 4).

  Then, the respective side portions 35 of the magnetic core halves 21a and 21b are sandwiched and locked from both sides by a locking member 40 such as an elastic spring shown in FIG.

  As described with reference to FIG. 6, the magnetic core 14 has a height dimension from the reference position C by concave and convex fitting between the positioning convex portion 30 provided on the holder 24 and the positioning concave portion 34 of the magnetic core 14. h4 and h5 are accurately positioned.

  Next, in the present invention, the holder 24 to which the magnetic cores 13 and 14 are attached is inserted from the opening 28 side of the case 20 and fixedly supported in the internal space of the case 20.

  4 and 5 are partial cross-sectional views of the case 20, the magnetic core 14 and the bobbin 22 cut from the same plane as the plane formed by the X1-X2 direction and the Z1-Z2 direction. Although only one magnetic core 14 is provided on the left side of the figure, the magnetic core 13 attached to the right side of the holder 24 is simply omitted in order to make the positioning of the holder 24 and the case 20 easier to see in the drawing. The magnetic core 13 is also attached to the right side of the holder 24 in the figure.

  As shown in FIG. 4, the holder 24 to which the magnetic cores 13 and 14 (and the bobbin 22) are attached is inserted into the internal space of the case 20 from the opening 28 side of the case 20.

  As shown in FIG. 5, the notches 29 and 29 formed in the upper end portion 24 a of the holder 24 are abutted against the positioning convex portions 26 and 26 provided on the inner wall surface 20 c of the case 20. At this time, part of the magnetic cores 13 and 14 enter the window portions 25 and 25 provided in the case 20, and the magnetic gap G of the magnetic cores 13 and 14 is exposed from the window portions 25 and 25. Further, as shown in FIG. 5, the leg portions 32, 32 of the holder 24 extend downward from the back surface of the case 20 (in the Z2 direction in the drawing), so that the bottom surfaces 32a, 32a of the leg portions 32, 32 are provided. Is exposed from the back surface of the case 20. For this reason, a jig is attached to the bottom surfaces 32a and 32a, and the low surface 32a can be set as a reference position C in the polishing process.

  The holder 24 and the case 20 are positioned by abutment between the positioning convex portion 26 and the notch 29, and the height dimension h6 from the reference position C to the sliding surface 20a of the case 20 is accurately determined. .

  Further, the height h7 from the positioning convex portion 26 to the sliding surface 20a of the case 20 is regulated by a predetermined dimension, and the height from the reference position C to the sliding surfaces 13c, 14c of the magnetic cores 13, 14 is controlled. Since the length h4 is also regulated by a predetermined dimension, the holder 24 and the case 20 are positioned by the abutment of the positioning convex portion 26 and the notch 29, and the magnetic cores 13 and 14 are positioned. The amount of protrusion from the sliding surface 20a is regulated to a predetermined dimension.

  The track width with respect to the window portion 25 provided in the case 20 of the magnetic cores 13 and 14 by the case 20 and the holder 24 being concavo-convexly fitted by the two positioning convex portions 26 and 26 and the notches 29 and 29. Positioning in the direction (X1-X2 direction) is also performed accurately.

  Further, as shown in FIGS. 2 and 5, with the holder 24 in contact with the inner wall surface 20c of the case 20, the outer side surface of the case 20 and the magnetic core facing surface 24b of the holder 24 are viewed from both sides. The holder 24 is fixedly supported on the inner wall surface 20c of the case 20 by being sandwiched and locked by a locking member 41 such as a spring having elasticity, and the magnetic core 21 attached to the holder 24 is thereby supported. Positioning in the direction (Y1-Y1 direction) perpendicular to the track width direction is accurately performed with respect to the window portion 25 of the case 20.

  As described above, in the present invention, the height dimension h4 from the reference position c to the sliding surfaces 13c and 14c of the magnetic cores 13 and 14 with respect to the reference position C serving as a reference in the polishing step is used. The height dimension h5 to the lower edge part 36b1 of the facing surface 36b of the upper part 36 of the cores 13 and 14 and the height dimension h6 from the reference position C to the sliding surface 20a of the case 20 are defined by the case 20. Is determined by positioning by the concave and convex fitting between the notch 29 and the positioning convex portion 26 between the holder 24 and the positioning convex portion 26 and positioning by the concave and convex fitting between the positioning concave portion 34 and the positioning convex portion 30 between the holder 24 and the magnetic core 21. As shown in FIG. 7, the magnetic head 10 is attached to the jig at the reference position C, and the jig is rotated from the rotation center B of the jig with a predetermined rotation radius R1 to obtain an unillustrated abrasive. When polishing the sliding surface 20a, 13c, 14c of the case 20 and the magnetic cores 13 and 14 makes it possible to reduce than the amount of polishing in the prior art.

  That is, since the case 20 has not been positioned at all with respect to the reference position C in the past, the height dimension from the reference position C to the sliding surface 20a of the case 20 varies depending on each product. In the polishing step of keeping the gap depth Gd at the magnetic gap G of the magnetic cores 13 and 14 within a predetermined length range, the sliding surface 20a of the case 20 may have to be scraped in a large amount. In the present invention, since the sliding surface 20a of the case 20 together with the magnetic cores 13 and 14 is also assembled with reference to the reference position C from the time of assembly, the height dimensions h4, h5 and h6 vary at the time of assembly. Can be reduced in each product.

  As a result, it is not necessary to design the dimensions in the height direction of the magnetic cores 13 and 14 and the case 20 in anticipation of cutting a considerable amount of the case 20, and the sliding surface 20a of the case 20 at the time of assembly. It is possible to design each of the height dimensions h4, h5, and h6 in a state where it is almost unnecessary to cut, and the sliding surfaces 20a, 13c, 14c of the case 20 and the magnetic core 13 as shown in FIG. It is possible to obtain a gap depth Gd of a predetermined dimension by slightly polishing. In the polishing step, the erasing head 11 shown in FIG. 1 is also attached, and the sliding surface of the erasing head 11 is similarly polished.

  3 and 4, the upper end 24a of the holder 24 is provided with two notches (positioning recesses) 29 and 29 formed at predetermined intervals in the X1-X2 direction. Positioning convex portions 26 and 26 formed at predetermined intervals in the X1-X2 direction shown in the figure are provided on the inner wall surface 20c of the case 20, and the holder 24 is inserted into the case 20 from the opening portion 28 of the case 20. The notches 29 and 29 of the holder 24 are abutted against the projections 26 and 26 to position the holder 24 and the case 20, but as another form, as shown in FIG. The holder 24 is provided with two through holes 50 and 50 that are formed at a predetermined interval in the X1-X2 direction, penetrating from the case facing surface 24c to the magnetic core facing surface 24b. 0,50 said convex portion 26 of the case 20 side is fitted in may perform positioning of the holder 24 and the case 20. Even if the through holes 50 and 50 are not penetrated, a concave portion is provided at a position facing the convex portions 26 and 26 of the case facing surface 24 c of the holder 24, and the concave portion and the convex portion 26 are provided. May be a form in which concave and convex are fitted.

  The reference position C may not be the bottom surfaces 32a and 32a of the leg portions 32 and 32 of the holder 24, and other parts may be used as the reference position.

  However, in order to appropriately reduce the positional displacement accumulated by assembling the case 20, the magnetic cores 13 and 14, and the holder 24, the case 20 and the magnetic cores 13, 14 is preferably regulated, and therefore, in this embodiment, the bottom surfaces 32a and 32a of the leg portions 32 and 32, which are reference positions for polishing, are set as the reference position C.

  Although explanation is omitted, after the magnetic cores 13 and 14 and the holder 24 are assembled in the case 20, the resin is filled from the opening 28 of the case 20.

The partial perspective view which shows the magnetic head of this invention, FIG. 1 is a partial sectional view taken along line II-II in FIG. A partially exploded perspective view for explaining the structure of each component before assembling the case, the holder, the magnetic core half, and the bobbin; The fragmentary sectional view which shows the process at the time of attaching a holder in a case, The fragmentary sectional view which shows the process at the time of attaching a holder in a case, Partial enlarged sectional view of the magnetic core half and the holder, Partial sectional view of a magnetic head for explaining a polishing process; FIG. 4 is a partially exploded perspective view for explaining the shape of a holder having a configuration different from that of FIG. Partial sectional view showing a conventional magnetic head,

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnetic heads 13 and 14 Magnetic core 20 Case 22 Bobbin 24 Holder 25 Window part 26, 30 Positioning convex part 29 Notch part (positioning concave part)
32 Leg 34 Positioning recess 40 Locking member 50 Through hole C Reference position

Claims (8)

A magnetic core having a magnetic gap formed on the sliding surface side with the magnetic medium;
A magnetic functional member having a coil for inducing a magnetic field in the magnetic core and / or detecting a magnetic field in the magnetic core;
A window is formed that exposes the magnetic gap to the sliding surface, and a case having an opening in which a back surface opposite to the sliding surface is opened,
Attaching the magnetic core, and having a holder fixedly supported on the inner wall surface of the case,
When the predetermined part of the holder is a reference position, the holder is provided with positioning means for restricting the height dimension from the reference position to the sliding surface direction of each of the case and the magnetic core. A magnetic head.   The positioning means is an uneven fitting portion provided between an inner wall surface of the case and a case-facing surface facing the inner wall surface of the holder, and the case and the holder are formed by the uneven fitting portion. The magnetic head according to claim 1, wherein the case and the holder are positioned by being fitted.   A convex portion protruding in the holder direction is provided on the inner wall surface of the case, and a notch portion is provided at a position facing the convex portion at an upper end portion of the holder, and the holder is open to the opening of the case. The magnetic head according to claim 2, wherein the magnetic head is inserted into the case from a portion side, and the notch is abutted against the convex portion of the case to position the case and the holder.   At least 2 or more said uneven | corrugated fitting parts are provided, The said holder and said case are fitted by the said 2 or more uneven | corrugated fitting parts, and the positioning of the said holder and a case is made | formed. The magnetic head described.   An uneven fitting part is provided between the holder and the magnetic core, and the magnetic core and the holder are fitted by the uneven fitting part to position the magnetic core and the holder. The magnetic head according to any one of 1 to 4.   The holder is a flat plate material, and the holder is fixedly supported on the inner wall surface of the case by a locking member in a state where the case facing surface of the holder is in contact with the inner wall surface of the case. Item 6. The magnetic head according to any one of Items 1 to 5.   7. The magnetic head according to claim 1, wherein the reference position is a reference when the sliding surfaces of the magnetic core and the case are polished.   The said holder is provided with the leg part extended in the reverse direction to the said sliding surface direction in the lower end part of the said holder, The bottom face of the said leg part is made into the said reference position. Magnetic head.

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