KR100376342B1 - magnetic head device - Google Patents

Abstract

In the conventional magnetic head, since the bottom surface of the case in which the core is accommodated is fixed to the base substrate, and the base substrate is positioned, the core and the magnetic gap cannot be accurately positioned on the base substrate.

The cores 41 and 56 of the magnetic functional members 12, 13 and 14 are positioned in the plurality of positioning portions 23 and 51 formed in the holder 10, and the recording and reproducing of the holder 10 is performed. The lower surface of the first mounting region 21 in which the magnetic functional members 12 and 13 are held directly contacts the base substrate 17 so that the holder 10 is positioned. In addition, the holder 10 and the case 15 are held by the holding pieces 71 and 71 formed on the base substrate 17. Therefore, the magnetic gaps G1, G2, G3 formed by the respective cores 41, 56 are positioned with high accuracy with respect to the base substrate 17.

Description

Magnetic head device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device provided with a plurality of magnetic functional members consisting of a core and a coil, and more particularly, to a magnetic head device capable of positioning a plurality of magnetic functional members with respect to a base with high accuracy.

In a combination head or the like for a VTR, a magnetic functional member composed of a plurality of cores and coils is held in a shield case. The head device is fixed on the base substrate and attached to the device body through the base substrate.

In the conventional magnetic head of this kind, a holder holding each of a plurality of cores is inserted into a shield case and fixed with resin, and the bottom surface of the shield case is connected to the base by means of welding, caulking or bolting. It was fixed.

However, in the conventional magnetic head device, the shield case is fixed with respect to the base, and since the core is positioned through the holder in the shield case, the dimensional tolerances and positions of the shield case and the holder are used for positioning from the base substrate to the core. The crystallization tolerances accumulate. Therefore, the gap of the position of the magnetic gap of the core with respect to the base substrate becomes large.

In addition, the magnetic head device for a VTR in which a plurality of cores are housed in the shield case has a thin, long and high shield case, so that when it is attached to the base substrate based only on the bottom of the shield case, the inclination tolerance of the shield case relative to the base substrate Becomes large. Moreover, the position of the sliding surface of the shield case with respect to the base substrate is also easy to spread.

Therefore, when attaching the base substrate to the chassis of the device body or the like, it is necessary to perform inclination adjustment and height adjustment between the base substrate and the chassis in a three-dimensional and large adjustment width. Therefore, assembly and adjustment work is complicated.

In the case where the recording / reproducing core and the erasing core are formed in the shield case, it is necessary to preferentially position the recording / reproducing core and the magnetic gap with respect to the base of the apparatus body. However, it is difficult to prioritize the recording / reproducing cores with respect to the base if the shielding case in which the recording / reproducing cores and the erasing cores are housed is positioned on the base.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and can accurately position the core and the magnetic gap with respect to the base, reduce the adjustment width when attaching the base to the device body, or eliminate the need for adjustment of the magnetic head device. The purpose is to provide.

According to the present invention, even if a plurality of cores are formed in the case to increase the height dimension of the case, unnecessary tolerance of the case to the base can be minimized, and both the recording / reproducing core and the erasing core are formed. It is an object of the present invention to provide a magnetic head device in which a recording / reproducing core is preferentially positioned on a base in a case where the recording / reproducing core is set.

The present invention covers a magnetic functional member having a core forming a magnetic gap and a coil for inducing a magnetic field in the core and / or detecting a magnetic field in the core, a holder to which the magnetic functional member is mounted, and the magnetic functional member. A magnetic head device fixed to the holder in a state and having a case for exposing the magnetic gap and a base for attaching to the device body,

The cores of the plurality of magnetic functional members are positioned by a positioning portion formed in the holder, and the holder is positioned on the base by directly contacting the base positioning portion provided on the holder. It is characterized by.

Thus, the case is preferably positioned and fixed relative to the holder without contacting the base.

In addition, the case of this invention may be a case which has a shield function, and may not have a shield function. For example, in a case of covering a magnetic function member for recording and reproduction, a shield function may not be required.

In the present invention, the holder is directly positioned on the base by directly contacting the base positioning portion of the holder with respect to the base, and the core and the case are positioned with respect to the holder. Therefore, the positioning of the core relative to the base can be determined by the degree of molding of the holder, and the core and the magnetic gap can be positioned with high accuracy with respect to the case without intervening dimensional tolerances of the case. Therefore, the adjustment width at the time of attaching the base to the apparatus main body can be reduced, and the adjustment can be made unnecessary.

The present invention also applies to a case in which one magnetic functional member is housed in a holder, but is also effective in a magnetic head device in which a plurality of magnetic functional members are held in a holder.

That is, the holder has a first mounting area for holding the magnetic function member for recording and reproduction, and a second mounting area for the magnetic function member for erasing parallel to the sliding direction of the magnetic function member and the magnetic tape. The base positioning portion may be formed in the first mounting region, and the first mounting region of the holder may be positioned on the base. The base positioning portion may be formed from a first mounting region to a part of the second mounting region.

For example, in the first mounting area, a first magnetic function member for recording and reproduction and a second magnetic function member are held in parallel with the base in a direction perpendicular to the base, and the magnetic function member for erasing is At least one of the first and second magnetic functional members is held at a position parallel to the sliding direction with the magnetic tape.

Therefore, it is preferable that a gap is formed between at least a part of the second mounting area of the holder and the case while the base positioning portion provided in the first mounting area is in contact with the base.

Thus, in the case where a plurality of magnetic functional members are provided, the holder is positioned on the base relative to the first mounting region on which the magnetic functional members for recording and reproduction are mounted, or the first mounting region and the first mounting region. By positioning the holder on the base on the basis of a part of the second mounting area, the position of the magnetic gap for recording and reproduction on the base can be determined with high accuracy.

Moreover, in this invention, it is preferable that the holding piece which opposes is provided in the said base, and the said 1st mounting area of the said holder is hold | maintained directly by the holding piece or via a case.

Further, preferably, the holding piece and a part of the holder abut on a line extending in the vertical direction with respect to the base, thereby ensuring a perpendicularity between the holder and the base, and furthermore, a sliding surface of the magnetic tape is formed. When the side is turned forward, positioning of the holder in front of the holder is performed by the holding piece.

In this way, when the first mounting area is held by the holding piece formed on the base, the inclination tolerance can be reduced with respect to the base of the holder having a relatively high dimension, and the positioning accuracy of the sliding surface with the magnetic tape can also be increased. have.

1 is an exploded perspective view showing a combination head for a VTR as an example of the magnetic head device of the present invention.

2 is a front view of the case in which the case is not attached.

3 is a cross-sectional view taken along line 3-3 of FIG.

4 is a cross-sectional view taken along the line 4-4 of FIG.

5 is a perspective view of a state in which a case and a shield plate are attached and mounted on a base substrate.

6 is a front view of a state in which a case and a shield plate are attached and installed on a base substrate.

Fig. 7 is a side view of a state in which a case and a shield plate are attached and installed on a base substrate.

8 is a partial cross-sectional view showing an example of a mold for molding the holder and the elastic pressing member.

Fig. 9 is a front view of the magnetic head device showing the second embodiment.

Fig. 10 is a partial front view of the magnetic head device showing the third embodiment.

* Description of the symbols for the main parts of the drawings *

10: holder 10a: mold through hole 10e: protrusion

10f: base positioning unit 10g: step

12: first magnetic functional member 13: second magnetic functional member

14 third magnetic functional member 15 case

15a, 15b: Window 15a1: Bottom edge

15b1: Upper edge

16 case 16b window 17 base substrate

21: first mounting area 22: second mounting area

23, 51: positioning section 24, 52: elastic pressing section

24a, 52a: facing part 24b, 52b: 2nd facing part

31, 32: support wall 33, 53: transverse positioning part

34, 54: transverse elastic pressing part 35, 55: longitudinal positioning part

41, 56: core 42, 58: bobbin 43, 59: coil

44, 61: terminals C1, G2, G3: magnetic gap 62: shield plate

71: Retention piece 72: Positioning stud

1 is an exploded perspective view showing a combination head for a VTR as an example of the magnetic head device of the present invention, FIG. 2 is a front view showing a state in which a case is removed, FIG. 3 is a sectional view taken along the line 3-3 of FIG. 2 is a sectional view taken along line 4-4, FIG. 5 is a perspective view showing a state positioned on a base substrate, FIG. 6 is a front view showing a state positioned on a base substrate, FIG. 7 is a side view thereof, and FIG. 8 is a mold forming a holder. Fig. 9 is a front view showing another embodiment of the present invention.

The magnetic head device includes a magnetic functional member 12 for recording and reproducing sound, a second magnetic functional member 13 for recording and reproducing control signals, and an eraser for the holder 10 made of synthetic resin. The third magnetic function members 14 are all mounted in the same direction. Further, the case 5 which covers the first magnetic function member 12 and the second magnetic function member 13 from the front after the magnetic function members 12, 13, 14 are mounted on the holder 10. And a case 16 covering the third magnetic function member 14.

It is preferable that the case 15 covering the first magnetic function member 12 and the second magnetic function member 13 has a shield function. However, the case 16 covering the erasing third magnetic function member 14 does not have to have a shield function.

The magnetic head device is fixed on the base substrate 17 with respect to the holder 10.

The holder 10 is made of synthetic resin as a whole. As shown in FIGS. 1 and 2, the holder 10 has a first mounting area 21 in which the right half of the holder 10 is mounted on which the first magnetic function member 12 and the second magnetic function member 13 are mounted. ), And the left half is the second mounting area 22 on which the third magnetic function member 14 is mounted.

On the upper part of the first mounting area 21, a pair of support walls 31, 32 are integrally arranged in the transverse direction (Y1-Y2 direction: driving direction of the magnetic tape: gap length direction of the magnetic gap) with a gap between them. Formed. Positioning portions 23 and 23 are formed on the upper portions of the supporting walls 31 and 32. Moreover, a pair of elastic pressing parts 24 and 24 are formed integrally with the holder 10 in the part which opposes the positioning parts 23 and 23. As shown in FIG. The elastic pressing portions 24 and 24 are elastically deformable opposing portions 24a and 24a opposed to the positioning portions 23 and 23 and a second point identified from the opposing portions 24a and 24a. Has opposing portions 24b and 24b.

As shown in Fig. 3, the front (X1 direction) in which the first magnetic functional member 12 is mounted from the opposing portions 24a, 24a of the elastic pressing portions 24, 24 and the rear portion of the holder 10 on the X2 side. It extends toward, and inclines so as to become closer to the positioning parts 23 and 23 as it goes toward the front (X1 direction). 3, the said holder is formed with the through-hole 10a which penetrates backward from the said inclined opposing parts 24a and 24a.

As the opposing portions 24a and 24a move forward, they are inclined in the direction of the positioning portions 23 and 23, so that the front end of the core 41 mounted on the holder 10, that is, the G1 portion forming a magnetic gap. The part close to can be suppressed by the opposing parts 24a and 24a. Therefore, the magnetic gap forming portion of the first magnetic function member 12 can be positioned with high accuracy by the positioning portions 23 and 23.

FIG. 8 is a cross-sectional view showing a part of a mold used for injection molding the holder 10. As shown in FIG. In the first mold 25, particles 25a for forming the mold through hole 10a and the inclined opposing surfaces 24a and 24a are integrally formed. In addition, although the cavity 10A for forming the holder 10 is formed in the joint part of the 1st metal mold | die 25 and the 2nd metal mold | die 26, the said 2nd metal mold | die 26 is the said classification | fraction. A cavity 24A for forming one elastic pressing part 24 is formed.

After the resin is injected into the cavities 10A and 24A, the second mold 26 is separated in the X1 direction according to the guide mold 27, whereby the first mold 25 and the second mold 26 are formed. This can be carried out in the X1-X2 direction. As the particle 25a is formed and the through-hole 10a penetrating in the rear-end direction is formed as shown in FIG. 3, the opposing part 24a which inclines toward the positioning part 23 as it goes forward as mentioned above. , 24a) can be formed by resin molding.

As shown in FIG. 1 and FIG. 2, one supporting wall 31 is provided with a transverse positioning portion 33 extending upwardly than the positioning portion 23 as shown in FIG. The supporting wall 32 is formed by separating the elastically deformable transverse elastic pressing portion 34 opposed to the transverse positioning portion 33 from the transverse direction (Y direction). In this embodiment, the transverse elastic pressing portion 34 is resin-molded integrally with the holder 10, but the transverse elastic pressing portion 34 is formed of a metal leaf spring material, and the transverse elastic pressing portion 34 is formed. The press part 34 may be insert molded to the holder 10 and may be integrated.

4, a pair of longitudinal positioning parts 35 and 35 are formed inside the part which opposes the said horizontal positioning part 33 and the lateral elastic pressing part 34. As shown in FIG.

The first magnetic functional member 12 includes a core 41 having a core half body 41a and 41a joined to form a first magnetic gap G1 and a bobbin 42 mounted to the core 41. ) And a coil 43 wound around the bobbin 42. Moreover, the said bobbin 42 is provided with a pair of terminals 44, 44 which extend in the rear (X2 direction), and both ends of the winding of the coil 43 are connected to these terminals 44, 44, respectively. It is. The core half bodies 41a and 41a are elastically held by an elastic clip 45 formed of a metal leaf spring material.

2, 3, and 4 show a state in which the first magnetic function member 12 is attached to the holder 10. The first magnetic function member 12 can be positioned in the three-dimensional direction only by inserting it from the front of the holder 10 to the rear (X2 direction). First, the core of the first magnetic function member 12 is inserted between the positioning portions 23 and 23 of the holder 10 and the elastic pressing portions 24 and 24. At this time, by pushing the first magnetic functional member 12 until the core 41 comes in contact with the longitudinal positioning portions 35 and 35, the gap depth direction of the core 41 (longitudinal direction: X2 direction) You can set the position of.

In addition, the core 41 is pressed in the Z1 direction by the elastic force of the opposing portions 24a and 24a of the elastic pressing portions 24 and 24, and is pressed so as to be pressed against the positioning portions 23 and 23. As a result, the core 41 is positioned in the track width direction (Z direction). In addition, the core 41 is pressed in the Y2 direction by the transverse elastic pressing portion 34, the side surface of the core 41 is pressed against the transverse positioning portion 33, and the core 41 is in the transverse direction (gap). In the longitudinal direction).

In this way, the core 41 of the first magnetic function member 12 is accurately positioned in the three-dimensional direction by the positioning portions 23, 23 and 35. Here, the elastic holding force by the elastic clip 45 holding the core half 41a of the core 41 and the core half 41a is applied to the opposing portions 24a, 24a of the elastic pressing parts 24, 24. By the pressing force and the pressing force by the transverse elastic pressing part 34 are set sufficiently larger. Therefore, even when the core 41 is subjected to the elastic pressing force of the opposing portions 24a and 24a and the transverse elastic pressing portion 34, the core half body 41a and the core half body 41a are firmly held by the clip 45. It is. Therefore, the core half body 41a and the core half body 41a are displaced in the Z direction, or the core half body 41a and the core half body 41a are inverted so as to be bent in the Z direction with respect to the magnetic gap G1. There is no problem such as.

In addition, as shown in FIG. 2, the bobbin 42 of the first magnetic functional member 12 is sandwiched by both of the elastic pressing portions 24 and 24 on both sides in the transverse direction (Y direction) to move in the transverse direction. This is regulated. Although some gaps may be formed between the pair of elastic pressing parts 24 and 24 and both sides of the bobbin 42, the bobbin 42 is preferably elastic with the elastic pressing part 24. The pressing section 24 is held with a weak elastic force from both sides in the Y direction. Therefore, in the first magnetic function member 12, the bobbin 42 and the coil 43 do not move unnecessarily in the lateral direction and are not inclined. Since the bobbin 42 can be prevented from inclining with respect to the Z line, the directivity of the recording magnetic field applied to the core 41 is biased or the magnetic field in the core 41 can be detected by the coil 43. It is possible to prevent the directivity of the detection intensity at the time of bias.

3, the pair of terminals 44, 44 extending backward from the bobbin 42 of the first magnetic functional member 12 is in the small hole 10b opening at the rear of the holder 10. As shown in FIG. It is inserted and protrudes behind the holder 10. In the state where the core 41 is pressed against the positioning portions 23 and 23 so that the position of the core 41 in the Z1 direction is determined, the terminal 44 has the small hole 10b on the Z1 side (the positioning portion ( 23 and 23 are in contact with the edge portion 10b1 of the side opposite to the positioning direction. In this state, the core 41 inserted into the hole 42a of the bobbin 42 is in contact with the edge portion 42a1 on the Z2 side of the hole 42a. Therefore, in the first magnetic function member 12, the bobbin 42 can be prevented from swinging in the Z direction with respect to the core 41.

The second magnetic function member 13 has a structure substantially the same as that of the first magnetic function member 12. In other words, the second magnetic function member 13 also forms the second magnetic gap G2 by joining the core half body 41a and the core half body 41a. In the first mounting region 21 of the holder 10, the first magnetic function member 12 and the second magnetic function member 13 are mounted in a direction symmetrical to the Z direction.

Under the first mounting area 21 of the holder 10, a mechanism for positioning the second magnetic function member 13 is up and down with a mechanism for positioning the first magnetic function member 12. It is formed symmetrically. Then, the second magnetic function member 13 is positioned in the same manner as the first magnetic function member 12. That is, in the lower portion of the first mounting region 21 of the holder 10, the positioning portion 23, which is the same as the positioning of the first magnetic functional member 12, and the elastic pressing portion 24 opposed thereto. And a transverse positioning portion 33, a transverse elastic pressing portion 34 and a longitudinal positioning portion 35 opposed thereto.

As described above, the core 41 of the first magnetic function member 12 is pressed by the positioning portion 23 in the Z1 direction to be positioned by the positioning mechanism formed upside down and symmetrically, and the second magnetic function member ( The core 41 of 13 is pressed by the positioning section 23 in the Z2 direction and positioned. That is, the core 41 of the first magnetic function member 12 and the core 41 of the second magnetic function member 13 are both positioned as the positioning reference on the side surfaces of the cores 41 opposite to each other.

Accordingly, the second magnetic gap G1 formed by the core 41 of the first magnetic function member 12 and the second magnetic gap G1 formed by the core 41 of the second magnetic function member 13 are formed. The magnetic gap G2 can determine the relative positions in the track width direction (Z direction) with high accuracy. Also, by forming the positioning portions 23 and 23 positioned up and down in the holder 10 so as to be parallel to each other, the deviation of the azimuth angle between the magnetic gap G1 and the magnetic gap G2 is eliminated. Can be kept to a minimum

In addition, both the core 41 of the first magnetic function member 12 and the core 41 of the second magnetic function member 13 are close to the lateral positioning portions 33 and 33 located in the Y2 direction. It is positioned in the horizontal direction. Accordingly, the second magnetic gap G1 formed by the core 41 of the first magnetic function member 12 and the second magnetic gap G1 formed by the core 41 of the second magnetic function member 13 are formed. The magnetic gap G2 can coincide the quantum group gaps G1 and G2 on substantially the same line without shifting their positions in the Y direction.

In addition, the core 41 of the first magnetic function member 12 and the core 41 of the second magnetic function member 13 are connected to the longitudinal positioning portions 35 and 35 formed in the same holder 10. By this, the relative position in the gap depth direction can all be determined with high precision.

Next, a mechanism for positioning the third magnetic function member 14 is provided on the upper part of the second mounting region 22 of the holder 10. This positioning mechanism is substantially the same as the mechanism for positioning the first magnetic function member 12 and the second magnetic function member 13.

On the upper part of the second mounting region 22, a pair of positioning portions 51, 51 with a gap in the Y direction are opposed to the elastic pressing portions 52, 52 opposite to the positioning portions 51, 51. Formed. The elastic pressing portions 52 and 52 are formed by integrally forming the opposing portions 52a and 52a for pressing the core and the second opposing portions 52b and 52b identified from the opposing portions 52a and 52a.

Moreover, above the positioning part 51, the horizontal positioning part 53 is formed in the Y2 side, and the elastically deformable horizontal elastic pressing part 54 which opposes the said horizontal positioning part 53 is provided in the Y1 side. Is formed. 4, longitudinal positioning portions 55 and 55 are formed on the rear side of the holder 10 between the lateral positioning portion 53 and the lateral elastic pressing portion 54. As shown in FIG. .

The third magnetic function member 14 is a magnetic head for erasing, the core 56 is a center core piece 56a and a pair of side core pieces 56b and 56b joined together, and the two parts for erasing are provided. Three magnetic gaps G3 are formed. Moreover, the bobbin 58 is attached to the core 56, and the coil 59 for giving an erase magnetic field to this bobbin is wound. Moreover, the pair of terminals 61 and 61 extends backward from the bobbin 58.

The third magnetic function member 14 is also positioned by mounting it to the holder 10 from the front. That is, the core 56 of the third magnetic function member 14 is pressed against the positioning portions 51 and 51 by the opposing portions 52a and 52a of the elastic pressing portion 52, and positioning in the Z1 direction. This is done. In addition, the core 56 is pressed by the lateral positioning unit 53 by the lateral elastic pressing unit 54 to perform positioning in the lateral direction (Y direction). In addition, the core 56 is pressed in the longitudinal positioning portions 55 and 55 to position the core 56 in the gap depth direction.

In addition, as shown in FIG. 2, the bobbin 58 of the third magnetic functional member 14 is sandwiched between the opposing portions 52a, 52a of the pair of elastic pressing portions 52, 52, so that the bobbin 58 is It is prevented from moving in the lateral direction (Y direction) with respect to the core 56, and the bobbin 58 is prevented from inclining.

As described above, the core of each magnetic functional member 12, 13, 14 can be positioned in the three-dimensional direction only by inserting the respective magnetic functional members 12, 13, 14 with respect to the holder 10 from the front. .

3 to 7, the case 15 is covered with the first mounting region 21 of the holder 10. It is preferable that the case 15 has a shielding function. For example, the magnetic material such as stainless steel / permalloy or the three-layer structure of stainless steel or the surface (sliding surface with the tape) is made of stainless steel and the inner surface thereof is magnetic such as permalloy. The two-layer structure of the material is used. As shown in FIG. 4, the end of the case 15 is fitted into grooves 10c and 10d formed in the bases on the outer side of the support walls 31 and 32 of the holder 10. At this time, as shown in FIG. 3, the upper and lower walls of the case 15 are formed on the inner side by the second opposing portions 24b of the elastic pressing portion 24 formed above and below the first mounting region 21 of the holder 10. Is pressed down, and the case 15 is hold | maintained so that it may not move to an up-down direction (Z direction) by this. In this manner, the case 15 is positioned in such a manner as to cover the first mounting region 21 by the groove portions 10c and 10d formed in the holder 10, and the holder (by the second opposing portion 24b). 10) It is firmly fixed to.

The window 15a and the second magnetic function exposed by the core 41 of the first magnetic function member 12 and the first magnetic gap G1 are exposed on the tape sliding surface 15a of the front surface of the case 15. The window 15b which the core 41 of the member 13 and the magnetic gap G2 expose is formed.

3 and 6, the bottom edge of the window 15a on the upper side of the case 15 is positioned at the upper side of the holder 10 in the state where the case 15 is mounted on the holder 10. It is located slightly on the Z2 side than the portion 23, and the upper edge 15b1 of the lower window 15b is located slightly on the Z1 side than the positioning portion 23 on the lower side of the holder 10. Accordingly, when the case 15 is mounted, the core 41 of the first magnetic functional member 12 is formed by the bottom portion 15a1 of the upper window 15a by the opposing portion 24a of the elastic pressing portion 24. It is pressed down and positioned. In addition, the core 41 of the second magnetic function member 13 is pressed against the upper edge 15b1 of the lower window 15b by the opposing portion 24a of the elastic pressing portion 24 to be positioned.

Thus, before the case 15 is mounted, the core 41 of the first magnetic function member 12 and the second magnetic function member 13 is positioned by the positioning portion 23 of the holder 10. Although determined, the core 41 of the first magnetic functional member 12 and the core 41 of the second magnetic functional member 13 are each of the windows 15a and () when the case 15 is mounted. It is pressed against the edge portions 15a1 and 15b1 on the opposite side of 15b and positioned. Accordingly, the magnetic gap G1 formed in the core 41 of the first magnetic function member 12 and the magnetic gap G2 formed in the core 41 of the second magnetic function member 13 are formed of a case ( 15) can be accurately positioned, and the relative position of the quantum group gaps G1 and G2 in the height direction (Z direction) can be determined with high precision.

In addition, the case 16 is mounted in the second mounting region 22 of the holder 10. The case 16 may have a shield function or may be formed of stainless steel that does not have a shield function. Protruding pieces 16a are formed on the upper and lower surfaces of the case 16. The protruding pieces 16a are pressed against the upper and lower surfaces of the holder 10, thereby fixing the case 16 to the holder 10. . The protruding piece 16a protruding on the upper surface side of the case 16 intervenes between the projections 10e and 10e protruding from the upper surface of the holder 10 to position the holder 10 in the Y direction. This is done.

A window 16b is formed on the upper portion of the case 16, and the core 56 and the magnetic gap G3 of the third magnetic functional member 14 with the case 16 fixed to the holder 10. , G3) exposes from the window 16b.

5, 6 and 7, a shield plate 62 is attached to the upper surface of the case 15 and the case 15. As shown in FIG. An opening 62a is formed in the upper surface of the shield plate 62, and a pair of projections 10e and 10e projecting from the upper surface of the holder 10 are caught by the inner edge of the opening 62a.

Moreover, the pair of projections 63a and 63a are formed in the side bending piece 63 in the shield plate 62, and the rear bending piece 64 is formed in the rear part of the shield plate 62. As shown in FIG. As shown in FIG. 7, in the state where the shield plate 62 is mounted, the side ends of the holder 10 are fitted into the rear bent pieces 64 and the projections 63a and 63a so that the shield plate 62 is moved forward and backward ( X direction).

As described above, the assembly of the magnetic head apparatus in which the magnetic functional members 12, 13 and 14 are attached to the holder 10, and the cases 15 and 16 and the shield plate 62 is attached is It is attached on the base substrate 17. As shown in Fig. 2, base positioning portions 10f and 10f are formed on the lower surface of the holder 10, and the base positioning portions 10f and 10f abut against the upper surface of the base substrate 17 so that the holder is closed. It is positioned. At this time, holders other than the base positioning portions 10f and 10f (the lower surface of the second mounting region 22 of the holder 10) and the cases 15 and 16 do not touch the base substrate 17. . That is, the assembly of the magnetic head device on the base substrate 17 is positioned with respect to the holder 10.

Therefore, the magnetic gaps G1, G2, G3 of each of the magnetic functional members 12, 13, 14 can be accurately positioned with respect to the base substrate 17 only by the tolerance existing only in the dimensional accuracy of the holder 10.

In particular, since the base positioning portions 10f and 10f formed in the first mounting region 21 of the holder 10 are positioned in direct contact with the base substrate 17, the first mounting region 21 The cores 41 of the first and second magnetic functional members 12 and 13 for recording and reproducing are held in the height direction (Z direction) preferentially on the base substrate 17. In this manner, the core 41 and the magnetic gaps G1 and G2 of the first and second magnetic functional members 12 and 13 for recording and reproduction are accurately positioned with respect to the base substrate 17, so that the base substrate ( 17) in the device body, the adjustment width for positioning the magnetic gaps G1 and G2 in the device body can be made small, or unadjustable.

The base substrate 17 is formed of a metal plate, and a pair of holding pieces 71 and 71 are bent from the base substrate 17 of the metal plate. Although the case 15 is elastically held by these holding pieces 71 and 71, as shown in FIG. 7, the holding piece 71 touches the step 10g of the holder 10. As shown in FIG. In addition, the part of the 1st mounting area 21 of the said holder 10 may be hold | maintained directly by the said holding pieces 71 and 71, without passing through the case 15. As shown in FIG.

5 to 7, the case 15 is held in the Y direction in the holding pieces 71 and 71 so that the first mounting region 21 moves in the Y direction with respect to the base substrate 17. Positioning can be done accurately without work. In addition, the vertical positioning of the holder 10 can be ensured by bringing the base positioning portions 10f and 10f into close contact with the upper surface of the base substrate 17. Further, the step 10g of the holding pieces 71 and 71 and the holder 10 abut through a vertical line from the base substrate 17, so that the front and rear directions of the sliding surface 15A of the case 15 (the X-direction) ) Is also possible.

In this magnetic head device, the base substrate 17 is attached to the device body. As described above, the holder 10 is directly positioned on the base substrate 17, and the magnetic gaps G1, G2, and G3 of the respective magnetic functional members 12, 13, and 14 are positioned on the holder 10. Since the magnetic gaps G1, G2, and G3 are positioned with high accuracy with respect to the device body.

9 shows a second embodiment of the present invention.

In this embodiment, the positioning stud 72 is fixed vertically to the base substrate 17. The positioning stud 72 has a metal column or resin column of a circular or rectangular cross section fixed to the base substrate 17. Alternatively, the positioning stud 72 may be bent vertically from the base substrate 17. A positioning hole formed vertically from the bottom is formed in the second mounting region 22 of the holder 10. This positioning hole is inserted into or fitted to the positioning stud 72.

Accordingly, the holder 10 has a magnetic gap on the base substrate 17 by closely contacting the base positioning portions 10f and 10f formed on the bottom of the first mounting region 21 on the base substrate 17. The height positions of the G1 and G2 can be determined, and the vertical position of the holder 10 on the base substrate 17 can be ensured by the positioning studs 72.

In the embodiment shown in FIG. 9, the height position and the inclination accuracy of each core can be determined on the base substrate 17 with respect to the holder 10.

FIG. 10 shows a third embodiment of the present invention, and shows the state where the holder 10 is positioned on the base substrate 17, with the illustration of the cases 15 and 16 omitted.

In each of the above embodiments, the base positioning portions 10f and 10f are formed only at the bottom of the first mounting region 21 of the holder 10, and as shown in FIGS. 2 and 9, the first mounting region ( A gap is formed between the entire bottom portion of the second mounting region 22 of the holder 10 and the surface of the base substrate 17 in a state where the bottom portion of the holder 21 is in close contact with the base substrate 17. .

However, in the third embodiment shown in FIG. 10, at the bottom of the holder 10, the base positioning portion is formed not only at the bottom of the first mounting region 21 but also at a part of the second mounting region 22. The base positioning portion is formed in the range indicated by L from the bottom of the first mounting region 21 to the bottom of the second mounting region 22. In the above range L, the holder 10 and the base substrate 17 are in close contact with each other and positioned. A gap is formed between the bottom of the second mounting region 22 and the base substrate 17 outside the above range L.

Also in the embodiment shown in FIG. 10, the cores 41 and the retainer gaps G1 and G2 of the first and second magnetic functional members 12 and 13 for recording and reproducing are accurately positioned with respect to the base substrate 17. Can be positioned.

As described above, in the present invention, since the holder is positioned in direct contact with the base, the core and the magnetic gap can be accurately positioned with respect to the base. Therefore, when the base is attached to the device body, the adjustment width for adjusting the base with respect to the chassis of the device body or the like can be made small, or the adjustment can be made unnecessary.

In addition, when the recording / reproducing core and the erasing core are provided, the recording / reproducing core can be preferentially positioned relative to the base.

Claims (8)

A magnetic functional member having a core forming a magnetic gap and a coil for inducing a magnetic field in the core and / or detecting a magnetic field in the core, a holder in which a plurality of the magnetic functional members are mounted, and the magnetic functional member covered. A magnetic head device fixed to the holder and having a case for exposing the magnetic gap and a base for attaching to the device body, Cores of the plurality of magnetic functional members are positioned by positioning portions formed in the holder, The holder has a first mounting area for holding a magnetic function member for recording and reproduction, and a second mounting area for holding a magnetic function member for erasing parallel to the sliding direction of the magnetic function member and the magnetic tape. And a base positioning portion is formed in the first mounting region and directly contacts the base, whereby the first mounting region of the holder is positioned on the base. The magnetic head device according to claim 1, wherein the case is positioned and fixed with respect to the holder. delete 2. The magnetic field device according to claim 1, wherein in said first mounting region, a first magnetic function member and a second magnetic function member for recording and reproduction are held in parallel with the base in a perpendicular direction. A magnetic head device, characterized in that the functional member is held at a position parallel to the sliding direction of the magnetic tape with respect to at least one of the first and second magnetic functional members. 2. A gap is formed between at least a portion of the second mounting region of the holder and the base in a state where the base positioning portion formed in the first mounting region is in contact with the base. Magnetic head device. 2. The magnetic head device according to claim 1, wherein the base is provided with a pair of holding pieces, and the first mounting region of the holder is held directly on the holding piece or through a case. The magnetic head device as set forth in claim 1, wherein the holding piece and a part of the holder abut on a line extending in a vertical direction with respect to the base, so that the perpendicularity between the holder and the base is secured. 8. The magnetic head device as set forth in claim 7, wherein the holding piece is positioned in front of the holder when the side on which the sliding surface with the magnetic tape is formed is moved forward.