KR100415445B1 - magnetic head device - Google Patents

Abstract

In the conventional magnetic head, since the core half body is held by the holder, the holder and the core half body are joined together, and the assembly is inserted into the case, the gap depth is uniformly uniform with respect to the tape sliding surface formed on the case. Could not be formed.

With respect to the holder 10, the cores 41, 56 of the plurality of magnetic functional members 12, 13, 14 are inserted and positioned from the front. In addition, the cases 15 and 16 are similarly inserted into the holder 10 from the front and positioned. Therefore, assembly work is easy. In addition, when the front surfaces of the cases 15 and 16 and the cores 41 and 56 are polished to form a tape sliding surface, the gap depths of the magnetic gaps G1, G2 and G3 can be set uniformly.

Description

Magnetic head device

The present invention relates to a magnetic head device for recording and / or reproducing a magnetic signal with respect to a magnetic tape. In particular, a magnetic functional member consisting of a core and a coil and a case covering the magnetic tape can be reliably positioned in the holder in the same direction. It relates to a magnetic head device that can be.

A conventional magnetic head device for magnetic tape combines holders holding the core half bodies to form magnetic gaps at opposing surfaces of the core half bodies, and fixes the holders with a leaf spring or the like to be stored in the shield case. The center was fixed by resin.

However, in the magnetic head device of the conventional structure, since the holder holding the core is accommodated in the shield case, positioning of the shield case and the magnetic gap, in particular, of the magnetic gap with respect to the magnetic tape sliding surface of the shield case The setting accuracy of gap depth is bad.

In other words, when the tape sliding surface is polished on the front surface of the shield case, the tape sliding surface and the core exposed to the window of the shield case are polished by maintaining the back surface of the shield case or the like. It was difficult to uniformly match the gap depth of the magnetic gap with respect to. Therefore, there exists a fault which the gap of a gap depth produces for every magnetic head. Also, in the case of a compound magnetic head (combination head) in which a plurality of cores are stored in a shield case, in each magnetic gap formed of a plurality of cores located in the same shield case, the gap depth in the tape sliding surface There is also the problem of scattering.

Moreover, in the conventional magnetic head device, since the holder holding the core is inserted into the shield case from the bottom side, the assembling work of the core, the holder and the shield case is complicated, and particularly in the magnetic head device having a plurality of cores The assembly work was more complicated.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and allows a magnetic function member having a core and a case to be mounted to a holder in the same direction, thereby facilitating the assembling work of the magnetic function member and the case with the holder. The purpose is to provide.

It is also an object of the present invention to provide a magnetic head device capable of setting the gap depth of the magnetic gap with respect to the tape sliding surface polished on the front surface of the case with high accuracy and uniformity.

It is also an object of the present invention to provide a magnetic head device capable of positioning both a core of a magnetic functional member and a case in a two-dimensional direction, preferably in a three-dimensional direction with high accuracy.

The present invention provides a magnetic functional member having a core having 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 on which the magnetic functional member is mounted, and covering the magnetic functional member. A magnetic head device having a case fixed to the holder in a state and formed with a window for exposing the magnetic gap,

When the magnetic tape is slid to the front, the magnetic functional member is inserted into the holder from the front so that the core is positioned on the holder, and the case is also mounted on the holder from the front and positioned. will be.

It is also preferable that the holder is made of a resin, and the holder is provided with a longitudinal positioning portion in which the core is inserted from the front and touches, and a positioning portion in which the case is inserted from the front and touches.

Moreover, the case in this invention may be a case which has a shield function, and may not have a shield function. For example, in the case of the case covering the magnetic function member for recording and reproduction, it is preferable to have a shield function, but in the case of the case covering the magnetic function member for erasing, the shield function is not particularly required.

In this magnetic head device, the core and the case are mounted together and positioned from the same direction with respect to the holder. Therefore, the attachment work of the core and the case is simple. Further, since the core and the holder can be positioned by simply pressing the core and the case to the holder from the front, the relative position between the front of the case and the front part of the core can be determined with high accuracy. Therefore, if the tape sliding surface is formed by polishing the core exposed from the front surface of the case and the window of the case, such as by holding the rear portion of the holder, the gap depth of the magnetic gap can be uniformly determined with respect to the tape sliding surface.

In the present invention, one magnetic function member may be attached to the holder, but it is also possible to mount and position a plurality of magnetic function members. In this case, the gap of the gap depth of the magnetic gap of each core with respect to the tape sliding surface of a case can be prevented.

The holder may be provided with a transverse positioning portion for positioning the core in the gap length direction of the magnetic gap.

In this case, two magnetic functional members are held in the holder in parallel in the track width direction, and the quantum functional member is positioned together in the gap length direction by the lateral positioning portion, thereby producing a quantum functional member. It can be assumed that the magnetic gap formed by the core of is located on substantially the same line.

By positioning the individual cores in the lateral positioning portions of the common holder, the magnetic gap formed in the cores of the two magnetic mechanism members can be set on the same line with high accuracy.

In addition, the cores of the respective magnetic functional members are positioned on the basis of the surface on the side of which both cores face each other. In this way, the positioning portion of the holder can be formed two-dimensionally or three-dimensionally.

In the case, a window is formed in which the cores of the respective magnetic functional members are exposed, and the cores of the respective magnetic functional members are positioned on the basis of the edge portions of the opposite sides of the window.

With respect to the holder, when the core and the case are attached, the opposite positions of the core can be determined based on the edge portion of the window of the case. By positioning both cores with respect to the edge portion of the case facing the window, the gap between the two cores in the track width direction can be minimized.

The holder may also be provided with a positioning wall for positioning the case in the magnetic tape sliding direction.

Further, the holder is provided with a first mounting area in which the magnetic function member for recording and reproduction is positioned, and a second mounting area in which the magnetic function member for erasing is positioned, and the first mounting area and the second mounting area are formed. Each case is mounted in the mounting area from the front, and is positioned, and the upper surfaces of the two cases are approximately the same surface, and a shield plate covering both cases is attached to the upper surface.

In the case of forming two cases, since each case can be accurately positioned in the holder, the upper surface of both cases can be the same surface, and the shield plate can be fixed in close contact with the upper surface of both cases. do.

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 a state where the case is not installed;

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

4 is a cross-sectional view taken along line 4-4 of FIG. 2;

5 is a perspective view of a state in which a case and a shield plate are installed and installed on a base board;

6 is a front view of a case in which a case and a shield plate are installed and installed on a base board;

7 is a side view of a state in which a case and a shield plate are installed and installed on a base board;

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

9 is a partial sectional view showing a second embodiment;

10 is a perspective view showing a third embodiment;

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

10 holder 10a through hole

Grooves for positioning of 10c and 10d cases

10e protrusion 10f base positioning part

10h, 10i tape guides

Positioning section for the 10k case 12 First magnetic functional member

13 Second Magnetic Functional Member 14 Third Magnetic Functional Member

15 cases for 15a, 15b window

15a1 bottom edge 15b1 top edge

16 case 16b window

17 Base board 21 First mounting area

22 2nd mounting area 23, 51 positioning part

24, 52 Elastic presser 24a, 52a Opposite part

24b, 52b 2nd opposing part 31, 32 support wall

33, 53 Lateral positioning section 34, 54 Lateral elastic pressing section

35, 55 Longitudinal positioning part 41, 56 core

42, 58 bobbin 43, 59 coil

44, 61 terminal G1, G2, G3 magnetic gap

62 Shield Plate 71 Maintenance Piece

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 15 covering 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 to 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 and 32 are provided 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. It is formed integrally. 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 minimized. Can be suppressed

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, 52 are formed by integrally forming the opposing portions 52a, 52a for pressing the core and the second opposing portions 52b, 52b identified from the opposing portions 52a, 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. Further, as shown in Fig. 5, 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. .

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 59.

The third magnetic function member 14 is also positioned by mounting the holder 10 from the front side. In other words, the core 56 of the third magnetic function member 14 is pressed by the positioning portions 51 and 51 by the opposing portions 52a and 52a of the elastic pressing portion 52 to be positioned in the Z1 direction. In addition, the core 56 is pressed by the transverse elastic pressing unit 54 by the transverse positioning unit 53 to perform positioning in the transverse direction (Y direction). Moreover, since the core 56 is pressed against the longitudinal positioning parts 55 and 55 shown in FIG. 4, the core 56 is positioned in the gap depth direction.

2, the bobbin 58 of the 3rd magnetic functional member 14 is pinched by the opposing parts 52a and 52a of the said pair of elastic pressing parts 52 and 52, and the bobbin 58 Movement to the core 56 in the lateral direction (Y direction) is prevented, and the bobbin 58 is prevented from tilting.

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

3 to 7, the case 15 is covered with the first mounting region 21 of the holder 10. The case 15 preferably has a shielding function. For example, the stainless steel is a wear-resistant material on the side of the tape sliding surface, and a three-layer structure of magnetic material / stainless steel such as stainless steel / permalloy in the plate thickness direction, or the surface (tape and The sliding surface) is a stainless steel, and the inner surface has a two-layer structure made of magnetic material such as permalloy. As shown in FIG. 4, the end part of the case 15 is fitted in the groove parts 10c and 10d formed in the base of the outer side of the said support wall 31 and 32 of the holder 10. As shown in FIG. In this embodiment, when the bottom face of the said groove part 10c, 10d of the holder 10 is a positioning part with respect to a case, and the said case 15 is mounted in the X2 direction from the front, the case 16 A cross section of the end portion is inserted into the positioning portion of the bottom face of the groove portions 10c and 10d so that the case 15 is positioned in the X direction with respect to the holder 10.

At this time, as shown in FIG. 3, the upper and lower walls of the case 15 are formed 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. This is pressed down from the inner surface, whereby the case 15 is positioned without moving in the vertical direction (Z direction) and firmly fixed to the holder 10.

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. This case 16 may have a shield function, or may be formed with the stainless steel of the wear-resistant material which 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. . When the case 16 is mounted in the X2 direction from the front, the end surface of the end portion of the case 16 is inserted into the positioning portion of the holder 10 to perform positioning in the X direction of the case 16. In addition, the projecting 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 and in the Y direction of the holder 10. Positioning is made.

The upper part of the case 16 has a window 16b formed thereon, with the case 16 being fixed to the holder 10, the core 56 and the magnetic gap G3 of the third magnetic functional member 14. , G3) exposes from the window 16b.

After the case 15 and the case 16 are attached to the holder 10, the front surface of the case 15 and the front surface of the case 16 are polished to form a tape sliding surface, but at this time, the case 15 The cores 41 of the first and second magnetic function members 12 and 13 exposed to the windows 15a and 15b of the same are also polished together to expose the third magnets exposed from the window 16b of the case 16. The core 56 of the functional member 14 is also polished together.

Each of the cores 41, 41, and 56 is mounted in the X2 direction with respect to the holder 10, and is positioned in the X direction by the longitudinal positioning units 35, 35, and 55, and the case ( 15) and 16 are also inserted and positioned with respect to the holder 10 in the X2 direction. Therefore, the front end of each core 41, 41 and 56, and each case 15 and 16 in the state which each core 41, 41 and 56 and each case 15 and 16 are attached, ) Are positioned with high precision with respect to the rear end surface (cross section on the X2 side) of the holder 10. Therefore, when the front surfaces of the cases 15 and 16 are polished on the basis of the rear end surface of the holder 10 and the tape sliding surfaces are polished, the cores 41, 41 and 56 are subjected to the tape sliding surfaces. The gap depths of the magnetic gaps G1, G2, and G3 formed in Fig. 2) can be set uniformly.

As shown in FIG. 5, FIG. 6, and FIG. 7, the shield plate 62 is attached to the upper surface of the case 15 and the case 16. As shown in FIG. Since the case 15 and the case 16 are positioned together in the same holder 10 together and positioned, the upper surfaces of both the cases 15 and 16 can be approximately the same surface. Therefore, the shield plate 62 can be attached so as to be in uniform contact with the upper surfaces of the case 15 and the case 16.

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, a pair of protrusions 63a and 63a are recessed in the side bending piece 63 of 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 on the upper surface of the base substrate 17 so that the holder ( 10). At this time, holders and cases 15 and 16 of portions other than the base positioning portions 10f and 10f 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.

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. As a result, the holder 10 is positioned in the front-rear direction (X direction) with respect to the base substrate 17.

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.

Fig. 9 shows a second embodiment of the present invention and is a cross sectional view of a magnetic head device cut into a portion where a magnetic core is not formed.

In FIG. 9, in the 2nd mounting area, in the front part of the holder 10, projection shape or protrusion positioning parts 10k and 10k are integrally formed, and the tape sliding surface of the case 16 is shown. The case 16 is positioned in the holder 10 by inserting the rear surface of the case into the positioning portions 10k and 10k. In the same manner as in the case 15, the back surface of the tape sliding surface may be inserted into and positioned in the positioning portion of the holder.

10 shows a third embodiment of the present invention. In this embodiment, the upstream tape guides 10h and 10h and the downstream tape guides 10i and 10i are integrally formed in the holder 10. The cases 15 and 16 are attached and positioned with respect to the holder 10 so as to be fitted into the tape guides 10h and 10h and 10i and 10i. With the cases 15 and 16 attached, the tape guides 10h and 10h and 10i and 10i protrude toward the tape sliding surface through the sides of the cases 15 and 16.

In this embodiment, since the tape guides 10h and 10h and 10i and 10i are formed in the holder 10 which positions the cases 15 and 16, the window of each case 15 and 16 is provided. The relative positions of the magnetic gaps G1, G2 and G3 exposed to the 15a, 15b and 16b and the tape guide can be determined with high precision, and the running position of the tape T with respect to each magnetic gap can be stabilized.

As described above, in the present invention, since the core and the case of the magnetic functional member can be mounted from the same direction with respect to the common holder, the mounting operation of the core and the case is easy. In addition, the gap depth of the magnetic gap of the core with respect to the tape sliding surface formed in the case can be formed uniformly.

In the case where a plurality of cores are held in the core, the gap between the gap depths of the magnetic gaps of the individual cores can be reduced.

Claims (8)

A magnetic function member having a core having 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 on which the magnetic function member is mounted, and the holder in a state covering the magnetic function member; A magnetic head apparatus having a case having a window fixed to the upper surface and exposing the magnetic gap, wherein the core of the magnetic functional member is inserted into and touched to the holder when the side on which the magnetic tape slides is moved forward. A longitudinal positioning portion in which the core is positioned in the holder, a support portion for elastically supporting the core of the magnetic function member inserted in the holder, and a position in which the case is inserted into and touched by the front to be mounted and positioned in the holder Magnetic head device, characterized in that the crystal portion is formed. The magnetic head device according to claim 1, wherein the holder is made of resin. The magnetic head device according to claim 1, wherein the holder is formed with a transverse positioning portion for positioning the core in the gap length direction of the magnetic gap. 4. The holder according to claim 3, wherein two magnetic functional members parallel to each other in the track width direction are held in the holder, and the quantum functional members are positioned together in the gap length direction by the lateral positioning section. A magnetic head device, characterized in that the magnetic gap formed by the core of the functional member is located approximately on the same line. 5. The magnetic head device as set forth in claim 4, wherein the cores of the respective magnetic functional members are positioned with respect to the surface of the side where both cores face each other. The said case is formed with the window which the core of each magnetic functional member exposes, The core of each magnetic functional member is positioned with respect to the edge part of the opposite side of the window. Magnetic head device. The magnetic head device according to claim 1, wherein the holder is provided with a positioning wall for positioning the case in the magnetic tape sliding direction. 2. The holder according to claim 1, wherein the holder is provided with a first mounting region in which the magnetic function member for recording and reproduction is positioned, and a second mounting region in which the magnetic function member for erasing is positioned. Each case is mounted and positioned in the area and the second mounting area from the front, and the upper surfaces of both cases are approximately the same plane, A magnetic head device, characterized in that a shield plate covering both cases is attached to the upper surface.