JPH08106609A - Magnetic head device - Google Patents

Abstract

PURPOSE: To provide a magnetic head having excellent magnetic properties by sticking a holding member to the back core section of a magnetic circuit section. CONSTITUTION: The magnetic head is provided with a head core section 2 which has a magnetic gap that conducts at least one of magnetic recording, reproducing and erasing, and a back core section 3 which forms a magnetic path together with the head core section 2. Furthermore, it has a magnetic circuit which includes a winding coil installed in the back core section 3 and a holding member 5 which holds the magnetic circuit and is stuck to the back core section 3 of the magnetic circuit. As the holding member 5 does not catch nor touch the head core section 2, adverse effect of sticking and fixing of the holding member 5 to the magnetic gap can be prevented to provide a magnetic head excellent in magnetic property.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device, and more particularly to a magnetic head device for a flexible magnetic disk device.

[0002]

2. Description of the Related Art A conventional magnetic head device is shown in FIGS.
0 is shown. FIG. 7 is an external view of a conventional magnetic head device (tunnel erase type), FIG. 8 is an exploded perspective view of the magnetic head device (a supporting plate and a printed circuit board are not shown), and FIG.
Shows an example of mounting the magnetic head device in the case of the double-sided recording type.
7 and 8, 20 is a conventional magnetic head device, 21 is a head core portion having a recording / reproducing magnetic gap and an erasing magnetic gap, and 21a is a substantially T-shaped recording made of a magnetic material. .Playback core, 21b
Is a leg of a recording / reproducing core 21a into which the following recording / reproducing coil is inserted, 21c is a substantially T-shaped erasing core made of a magnetic material, and 21d is an erasing in which the following erasing coil is inserted and arranged. The core 21c is a leg portion, 21e is a center core that forms a magnetic gap with the recording / reproducing core 21a and the erasing core 21c and serves as a magnetic path of a magnetic circuit, 21f is a recording / reproducing magnetic gap, and 21g is erasing. The magnetic gap 21h is for joining the recording / reproducing core 21a and the center core 21e, and the erasing core 21c.
And glass for joining the center core 21e with the leg portion 2
1b is a recording / reproducing coil portion, 22a is a recording / reproducing coil, 22b is a bobbin around the recording / reproducing coil 22a, 23 is an erasing coil portion which is inserted into a leg portion 21d, and 23a is An erasing coil, 23b is a bobbin around which the erasing coil 23a is wound, and 24 is a back core after the recording / reproducing coil portion 22 is inserted and then adhesively fixed to the leg portion 21b and the center core 21e to close the recording / reproducing magnetic circuit. ,
25 is after inserting the erasing coil portion 23 into the leg portion 21d,
The back core portions 26 and 27, which are fixedly adhered to the leg portion 21d and the center core 21e and close the erasing magnetic circuit, are polished so that the head core portion 21 is sandwiched and the recording medium fixed to the head core portion 21 can slide smoothly. A holding member having a processed sliding surface, 26a and 27a are joint surfaces with the head core portion 21, 28 is a gimbal spring of a support plate, 29 is a recording / reproducing coil portion 22 and an erasing coil portion 23. It is a printed circuit board connected to the coil terminal of.

In FIG. 9, 30 is an upper magnetic head device, 31
Is a lower magnetic head device, and 32 is a recording medium.
The head portion of the upper magnetic head device 30 is arranged symmetrically with respect to the lower magnetic head device 31 with respect to the support plate. The recording medium 32 is disposed so as to sandwich the upper magnetic head device 30 and the lower magnetic head device 31, and the holding member 27 of the upper magnetic head device 30 and the head core portion 21 and the lower magnetic head device 31 of the lower magnetic head device 31 are arranged. The head core portion 21 and the holding member 27 of the upper magnetic head device 30 face each other and are in contact with each other suitable for recording / reproducing and erasing.

FIG. 10 shows another magnetic head device (a back core portion, a coil portion, a support plate, a printed circuit board, etc., not shown). In FIG. 10, 33 is a head core portion and 34 is a head core portion. 33 is a holding member having a sliding surface 34a that is polished so as to slide smoothly on a medium that is adhesively fixed to 33 from one side.

Next, the manufacturing method will be described. First, the head core portion 2 whose thickness and gap depth are appropriately processed
1 is sandwiched between the holding members 26 and 27 and bonded with an adhesive, which is heat-cured and fixed. Since excess adhesive has squeezed out and hardened on the sliding surface of the magnetic gap of the head assembly thus formed with the medium and the sliding surface with other media, after removing this adhesive residue with a blade etc. Then, the polishing amount is obtained, the depth of the gap is adjusted, and the sliding surface is polished to adjust the surface roughness so that the surface can slide smoothly on the recording medium. After that, measurement of the gap depth, cleaning, and the like are performed. Then, after inserting the recording / reproducing coil portion 22 into the leg portion 21b and the erasing coil portion 23 into the leg portion 21d without breaking the leg portion 21b and the leg portion 21d, the back cores 24 and 25 are adhered to each other. Close the road. Then, the holding members 26 and 27 are attached to the support plate 28.
Then, the recording / reproducing coil and the erasing coil terminal are connected to the printed circuit board 29.

Next, the operation will be described. As shown in FIG. 9, an electric signal at the time of recording or erasing from the flexible magnetic disk or the like is recorded via the printed circuit board 29 to the magnetic head device connected to the flexible magnetic disk or the like. A recording medium with a magnetic field flowing through the reproducing coil 22a or the erasing coil 23a, electromagnetically converted by the magnetic circuit including the head core portion 21 and the back cores 24, 25, and generated from the recording / reproducing magnetic gap 21f or the erasing magnetic gap 21g. A magnetic signal is recorded on 32 or the magnetic signal is erased. Also, recording / playback
The magnetic flux recovered by the reproducing magnetic gap 21f is converted into an electric signal by the recording / reproducing coil 22a and transmitted to the flexible magnetic disk device or the like via the printed board 29.

[0007]

Since the conventional magnetic head device is constructed as described above, it has the following problems. Since the head core part having the magnetic gap part is sandwiched by the holding members and heat-cured and bonded,
Unnecessary stress is applied to the magnetic gap portion of the head core portion, which adversely affects the magnetic characteristics. FIG.
In the case of the magnetic head device shown in Fig. 4, there is no adverse effect due to the pinching, but since the head core portion and the holding member are directly bonded, the stress generated at the bonding end portion between the holding member and the head core portion and the bonding end on the other side. It is not possible to eliminate the adverse effect of adhesion because unbalance is likely to occur in the stress generated in the portion and unnecessary stress is generated in the magnetic gap portion. Further, since the magnetic gap portion and the holding member are in contact with each other, the adhesive agent wraps around the magnetic gap portion, and extra adhesive debris appears on the sliding surface of the magnetic gap portion with the recording medium. Was there. Further, the recording / reproducing core and the erasing core of the head core portion are substantially T-shaped, and the leg portions are easily broken, and the yield of the high-value-added head core portion is poor. Also, the recording / reproducing coil and the erasing coil are relatively large because they are wound around the bobbin, and it is necessary to increase the distance between the leg portions of the head core into which the coil portion is inserted in order to allow a margin during assembly. However, it is an excessive design than what is actually required as a magnetic circuit and is an obstacle to miniaturization.

The present invention has been made to solve the above problems, and it is an object of the present invention to reduce or eliminate the adverse effect of the holding member on the magnetic gap portion, and to reduce the problems caused by the bobbin.

[0009]

In order to solve the above problems, a magnetic head device according to the present invention has a head core portion having a magnetic gap for performing at least one of magnetic recording, reproduction or erasing, and this head core. A magnetic circuit part having a back core part forming a magnetic path with the magnetic core part, a winding coil provided in the back core part, and a holding member for holding the magnetic circuit part, wherein the holding member is the magnetic circuit. Part is fixed to the back core part.

Further, there is a gap between the holding member and the head core portion.

There is a gap between the holding member and the magnetic gap of the head core portion.

The gap is 1.2 mm or less.

Further, the holding member has a notch portion in a portion facing the magnetic gap in the head core portion.

The head core portion has a recording / reproducing core for forming a recording / reproducing magnetic gap for performing magnetic recording or reproduction and an erasing core for forming an erasing magnetic gap. The core and the erasing core are formed in a substantially prismatic shape except in the vicinity of the magnetic gap.

Further, a sliding member for sliding on the recording medium is provided on the recording / reproducing core and the erasing core.

The head core portion has a recording / reproducing core and a center core for forming a recording / reproducing magnetic gap for performing magnetic recording or reproduction, and an erasing core for forming an erasing magnetic gap together with the center core. A sliding member that slides on a recording medium is provided on the recording / reproducing core and the erasing core.

Further, the back core portion has a non-magnetic layer in a portion forming a magnetic path with the center core portion.

The winding coil is wound around the back core portion.

Further, the winding coil is wound around the back core portion, and the winding coil is molded with synthetic resin.

Further, the area of the joint surface where the magnetic fluxes of the back core portion and the head core portion intersect at right angles, and the area of the back core portion is equal to or larger than the area of the head core portion.

Further, the magnetic material forming the head core portion has a characteristic of higher saturation magnetic flux density than the magnetic material forming the back core portion.

Further, the back core portion has a terminal portion for connecting an end of the winding coil.

The head core portion and the back core portion are joined with synthetic resin or glass.

Recording / recording for magnetic recording or reproduction
A head core section having a recording / reproducing core and a center core forming a reproducing magnetic gap, and an erasing core forming an erasing magnetic gap together with the center core;
The head core part includes a back core part forming a magnetic path, a magnetic circuit part having a winding coil provided in the back core part, and a holding member for holding the magnetic circuit part. It is fixed to the center core.

[0025]

Since the back core portion of the magnetic circuit portion is fixed to the holding member and the head core portion having the magnetic gap is not fixed to the holding member, it is possible to prevent the magnetic gap from being adversely affected by the attachment of the holding member.

Further, since there is a gap between the holding member and the head core portion, it is possible to prevent the magnetic gap from being adversely affected by the attachment of the holding member, and at the time of attaching the holding member to the sliding surface of the head core portion with the recording medium. It is possible to prevent adverse effects due to the wraparound of the adhesive.

Further, since there is a gap between the holding member and the magnetic gap of the head core portion, it is possible to prevent the adverse effect on the vicinity of the magnetic gap due to the wraparound of the adhesive when the holding member is attached.

Further, since the gap is within 1.2 mm, even when the magnetic head devices are arranged so as to sandwich the recording medium, the respective magnetic gaps are recorded at a predetermined contact pressure with the holding members of the magnetic head devices facing each other. Sandwich the medium,
Recording, playback, or erasing is possible.

Further, since the holding member has a notch portion in the portion of the head core portion facing the magnetic gap, it is possible to prevent the adverse effect on the vicinity of the magnetic gap due to the wraparound of the adhesive when the holding member is attached. .

Further, since the recording / reproducing core and the erasing core forming the head core portion are formed in a substantially prismatic shape except in the vicinity of the magnetic gap, there is no fear of leg breakage which has been a problem in the past.

Further, since the recording / reproducing core and the erasing core are provided with sliding members for sliding on the recording medium,
It is possible to prevent abrasion between the reproducing core and the erasing core.

The head core portion has a recording / reproducing core and a center core for forming a recording / reproducing magnetic gap, and an erasing core for forming an erasing magnetic gap together with the center core. Since a sliding member that slides on the recording medium is provided on the erasing core, it is possible to prevent wear between the recording / reproducing core and the erasing core in the same manner.

Further, the back core portion has a non-magnetic layer,
Since the recording / reproducing magnetic circuit and the erasing magnetic circuit can be separated by the non-magnetic layer, mutual interference is small and magnetic characteristics are excellent.

Further, since the winding coil is wound directly on the back core portion without passing through the bobbin, there is no space for inserting the bobbin and the bobbin, the magnetic path can be made small, and an efficient magnetic circuit can be realized. can do.

Further, since the winding coil is molded with synthetic resin, the winding coil can be easily fixed and protected.

Further, since the area of the joint surface where the magnetic fluxes of the back core portion and the head core portion intersect at right angles is equal to or larger than the area of the head core portion, the joint workability is excellent.

Furthermore, by making the magnetic material forming the head core portion have a higher saturation magnetic flux density than the magnetic material forming the back core portion, a magnetic head device having excellent magnetic characteristics can be obtained.

Further, since the back core portion has the terminal portion for connecting the terminal of the winding coil, it is not necessary to draw the terminal of the winding coil between the supporting plates, so that the disconnection can be prevented and the connection is easy.

Further, the head core portion and the back core portion are joined to each other with a synthetic resin so that the workability is excellent, and the joining with glass enhances the strength.

Further, since the holding member is fixed to the center core of the magnetic circuit section and unnecessary stress is not applied to the recording / reproducing core and the erasing core, it is possible to prevent the magnetic gap from being adversely affected by mounting the holding member.

[0041]

【Example】

Example 1. An embodiment of the present invention will be described. FIG.
1 is an external view of a magnetic head device (tunnel erase type) showing Embodiment 1 of the present invention, and FIG. 2 is an exploded perspective view (a supporting plate and a printed circuit board are not shown). 1 and 2, reference numeral 1 is a magnetic head device, 2 is a head core portion having a recording / reproducing magnetic gap and an erasing magnetic gap of the magnetic head device 1, and 2a is a recording / reproducing magnetic material. A reproducing core 2b is a slider which is a sliding member provided on the sliding side of the recording / reproducing core 2a with respect to the recording medium, 2c is an erasing core made of a magnetic material, and 2d is an erasing core 2c recording medium. Sliders, 2e, which are sliding members provided on the sliding side of and, are center cores that form the recording / reproducing core 2a and the erasing core 2c and the recording / reproducing magnetic gap and the erasing magnetic gap, and 2f is Recording / reproducing magnetic gap, 2g erase magnetic gap, 2g
h joins the recording / reproducing core 2a and the center core 2e,
Glass for joining the erasing core 2c and the center core 2e,
Reference numeral 3 denotes a back core portion which is adhesively fixed to the head core portion 2 and constitutes a magnetic circuit together with the head core portion 2, 3a denotes a substantially E-shaped back core made of a magnetic material, and 3b has legs around which a recording / reproducing coil is wound. The portion 3c is a leg portion around which an erasing coil is wound, and the portion 3d is joined to the center core 2e for recording.
Legs for closing the reproducing magnetic circuit and the erasing magnetic circuit, 3
e is a recording / reproducing coil, 3f is a recording / reproducing coil 3
Molded synthetic resin for fixing and protecting e, 3 g
Is an erasing coil and 3h is a molded synthetic resin that fixes and protects the erasing coil 3g. Since the coil end treatment is performed by soldering, a resin having a heat resistance of 300 ° C. is preferable. Reference numerals 4a, 4b and 4c respectively denote a joint portion between the head core portion 2 and the back core portion 3 and are bonded and fixed with an epoxy adhesive to form a back gap. Reference numeral 5 is a holding member that holds the back core portion 3 that constitutes a magnetic circuit and that has a sliding surface that is polished so that it can slide smoothly on the recording medium. Reference numeral 5a denotes a sliding surface and 5b denotes a head core portion 2. Notch 5c provided so as not to contact with
Reference numeral 6 is a joint portion that is adhered to the leg portion 3d, 6 is a gimbal spring that is a support plate that is adhered to the back core portion 3 and the holding member 5, and 7 is a coil terminal of the recording / reproducing coil 3e and an erasing coil. It is a printed circuit board connected to a 3 g coil terminal.

W1 and W2 are the thicknesses of the head core portion 2 and the back core portion 3, respectively. W1 is W2
In general, in a flexible disk device, the thickness W1 of the head core portion 2 is 0.3 mm to 0.35 mm, the pair of magnetic head devices sandwiches the recording medium, and the center of the magnetic gap is 1.5 mm. Arranged to have. Further, when the pair of magnetic head devices is used as described above, the notch portion 5b of the holding member is formed by the notch portion so that the medium contact pressure is applied to the magnetic gap of the magnetic head device where the sliding surface 5a is opposed. Is about 1.2 mm
It is provided as follows. W1 can be set to 0.3 mm or more and 3 mm or less depending on the mounted device, and the interval between the cutouts is set by the interval between the centers of the magnetic gaps arranged to face each other.

D1 and D2 are the widths of the center core 2e of the head core portion 2 and the leg portions 3d of the back core portion 3, respectively, and D1 is D2 or less.

Next, the manufacturing method will be described. First, the sliders 2b and 2d are provided, and the recording / reproducing coil 3e and the erasing coil 3g are wound around the head core portion 2 whose thickness and gap depth are appropriately processed, and the back core 3a which is approximately E-shaped. The back core portion 3 fixed and protected by molding with a rotating synthetic resin is connected to the back gaps 4a, 4
The thickness of b and 4c is adjusted and bonded. Also, the holding member 5
The joint portion 5c is adhered to the leg portion 3d and is heat-cured and fixed. Then, the polishing amount is obtained, the depth of the magnetic gap is adjusted, and the sliding surface is polished to adjust the surface roughness so that it can slide smoothly on the recording medium. Then measure the magnetic gap depth,
Wash etc. Then, the holding member 5 and the back core portion 3 are adhered to the support plate 6, and the recording / reproducing coil terminal and the erasing coil terminal are laid out and soldered to the printed circuit board 7 for electrical connection.

Since the operation is the same as the conventional one, the explanation is omitted.

Since the first embodiment is configured as described above, it has the following effects. Since the holding member does not sandwich the head core portion having the magnetic gap portion and is not in contact with the head core portion, it is possible to prevent adverse effects on the magnetic gap due to the adhesive fixing of the holding member, and it is possible to obtain a magnetic head device having good magnetic characteristics.

Further, since the head core portion and the holding member are not in contact with each other, the adhesive agent does not wrap around the magnetic gap portion and the sliding surface of the other recording medium, and the step of removing excess adhesive residue is eliminated.

Further, since the head core portion has the sliding member on the sliding surface with respect to the recording medium, the wear of the head core portion can be prevented.

Further, the recording / reproducing core and the erasing core of the head core portion are substantially prismatic, and there is no fear of leg breakage, and it is expected that the yield of the head core portion with high added value is improved.

Further, even when the holding member sandwiches the recording medium and uses a pair of magnetic head devices, the holding member can be slid so as to give an optimum contact pressure to the magnetic gap portion of the other magnetic head device when sliding. It has an area and can be formed into a simple shape as compared with a conventional holding member.

Further, by increasing the thickness W2 of the back core part, the head core can be stably bonded and at the same time relatively bonded to the support plate. Furthermore, when the thickness W2 of the back core portion is sufficiently thicker than the thickness W1 of the head core portion, it is not necessary to provide the holding member with a notch portion for preventing contact with the head core portion 2, and a simpler shape display is possible. It can be a member.

Further, since the cross-sectional area of the back core portion orthogonal to the flow direction of the magnetic flux is larger than that of the head core portion, even if a material having a relatively small relative magnetic permeability is used for the back core portion, the required magnetic flux as a whole is obtained. Can be secured.

On the contrary, by using a magnetic material having a high saturation magnetic flux density for the head core portion which needs to concentrate the magnetic flux, magnetic recording / reproducing characteristics are excellent.

Further, since the back gap is formed in the cross section orthogonal to the winding direction, the head core portion and the back core portion can be easily adhered, and the amount of the back gap is adjusted by the adhesive layer to perform recording / reproduction. The magnetic interference between the magnetic flux and the erase magnetic flux can be easily adjusted. The workability is improved by using an epoxy adhesive as the adhesive member, and the strength can be increased by using glass. In this case, glass having a melting point lower than that of the glass joining the recording / reproducing core and the erasing core and the center core is used.

Further, by increasing the width D of the leg portion of the back core portion, the back core portion and the holding member can be more stably fixed and can be further stably fixed on the support plate.

Further, since the coil is wound directly on the magnetic body (leg portion) without passing through the bobbin, the size can be relatively reduced, and since the coil is fixed by molding with synthetic resin, the coil is protected and insulative. Excellent in.

Although the first embodiment describes the preceding erase type magnetic head device, the same effect can be obtained even with the tunnel erase type magnetic head device.

Example 2. Another embodiment of the present invention will be described. FIG. 3 is an external view of a magnetic head device showing a second embodiment of the present invention (a supporting plate and a printed circuit board are not shown).
Is. In FIG. 3, the description of the same components as those in the above-described first embodiment will be omitted. Reference numeral 8 is a magnetic head device (a supporting plate and a printed circuit board are not shown), 9 is a back core portion which constitutes a magnetic circuit together with the head core portion 2, 9a is a recording / reproducing back core made of a magnetic material, and 9b. Is a record
Legs wound with a reproducing coil, 9c is a center core 2e
A leg portion joined to and closing the recording / reproducing magnetic circuit, 9d an erasing back core made of a magnetic material, 9e a leg portion wound with an erasing coil, and 9f an erasing magnetic circuit joined to the center core 2e. Closing leg, 9g is a separation layer for separating the recording / reproducing magnetic circuit and the erasing magnetic circuit, and 9h is a recording / reproducing magnetic circuit.
A reproducing coil, 9i is a molded synthetic resin for fixing and protecting the recording / reproducing coil 9h, 9j is an erasing coil, and 9k is a molded synthetic resin for fixing and protecting the erasing coil 9j. s is the width of the separation layer 9g, which is less than or equal to the width D1.

The second embodiment is different from the first embodiment in the back core portion 9, but the manufacturing method and operation are the same as those shown in the first embodiment, and detailed description thereof will be omitted.

Since the invention shown in the second embodiment is configured as described above, it has the following effects. Example 1
In addition to the effect shown in (1), since it has a separation layer that separates the recording / reproducing magnetic circuit and the erasing magnetic circuit, magnetic interference between recording / reproducing and erasing can be prevented and magnetic characteristics can be improved. An excellent magnetic head device can be obtained.

Example 3. Another embodiment of the present invention will be described. 4 is an external view of a magnetic head device showing a third embodiment, and FIG. 5 is an exploded perspective view (a supporting plate is not shown). 4 and 5, the description of the same components as those in the above-described embodiment will be omitted. Reference numeral 10 is a magnetic head device, 11 is a back core portion that constitutes a magnetic circuit together with the head core portion 2, and 1
Reference numeral 1a is a back core made of a magnetic material, 11b is a leg portion around which a recording / reproducing coil is wound, 11c is a leg portion around which an erasing coil is wound, and 11d is a recording / reproducing portion joined to the center core 2e. A leg portion for closing the magnetic circuit and the erasing magnetic circuit, 11e is a recording / reproducing coil, 11f is a molded synthetic resin for fixing and protecting the recording / reproducing coil 11e, 11g is an erasing coil, and 11h is erasing. Is a molded synthetic resin that fixes and protects the coil 11g for insulation, 11i is an insulating layer, and 11j to 1j.
1n is a terminal portion to which terminals of the recording / reproducing coil 11e and the erasing coil 11g are connected, 12 is a gimbal spring as a support plate, 13 is a printed circuit board, and 13a to 13e are terminal portions 11j to 11n, respectively. Is a connection part corresponding to.

In the third embodiment, the back core portion shown in the first embodiment is provided with a terminal portion for connecting the coil terminals of the recording / reproducing coil and the erasing coil, and the description of the overlapping portions will be omitted.

Explaining the manufacturing method as an excerpt, the head core portion 2 and the back core portion 11 provided with the coil terminal connection terminals and connected to the coil terminals are bonded by adjusting the back gaps 4a, 4b and 4c. Then, the holding member 5 is adhered and cured by heating to be fixed. After that, after performing the above-described processing and the like, the terminal portions 11j to 11n of the back core portion are joined to the terminal portions 13a to 13e of the printed circuit board 13 and soldered for electrical connection.

Since the invention shown in the third embodiment is configured as described above, it has the following effects. In addition to the effect shown in the first embodiment, since the coil terminal is provided in the back core portion, it is not necessary to draw the coil end around and it is possible to prevent disconnection due to contact with the support plate or the like. Further, the connection with the printed circuit board is made only by joining and soldering the terminal parts of the printed circuit board provided so as to match the terminal parts of the back core part, and electrical connection can be facilitated.

Example 4. Another embodiment of the present invention will be described. 6 is an external view of a magnetic head device (tunnel erase type) showing a fourth embodiment of the present invention (a supporting plate and a printed circuit board are not shown). In FIG. 6, the description of the same components as those in the above-described embodiment will be omitted. Reference numeral 14 is a magnetic head device, 15 is a head core portion having a recording / reproducing magnetic gap and an erasing magnetic gap of the magnetic head device 14, 15a is a recording / reproducing core made of a magnetic material, and 15b is a recording medium. A slider, which is a sliding member provided on the sliding side of the reproducing core 15a with the recording medium,
c is an erasing core, 15d is a slider which is a sliding member provided on the sliding side of the erasing core 15c with the recording medium, 1
5e is a recording / reproducing core 15a and an erasing core 15c.
A center core forming a recording / reproducing magnetic gap and an erasing magnetic gap, 15f is a recording / reproducing magnetic gap, and 15g is an erasing magnetic gap. Reference numeral 15h is glass for joining the recording / reproducing core 15a, the erasing core 15c and the center core 15e, and 16 is the head core portion 15
Also, a back core part that constitutes a magnetic circuit for recording / reproduction, 16a is a substantially L-shaped back core made of a magnetic material, 16b is a leg part around which a recording / reproducing coil is wound, 1
6c is a recording / reproducing coil, 16d is a molded synthetic resin for fixing and protecting the recording / reproducing coil 16c, 16e is an insulating layer, and 16f to h are connections for connecting recording / reproducing coil terminals. 17 is a back core portion that forms an erasing magnetic circuit together with the head core portion 15, 17a is a substantially L-shaped back core made of a magnetic material, 17b is a leg portion around which an erasing coil is wound, 17b
c is an erasing coil, 17d is a molded synthetic resin for fixing and protecting the erasing coil 17c, and 17e
Is an insulating layer, 17f and 17g are connecting portions for connecting the erasing coil terminals, and 18a and 18b are back gaps between the head core portion 15, the back core portion 16 and the back core portion 17, respectively, which are fixed by adhesion. ing. Reference numerals 18c and 18d denote back gaps between the head core portion 15, the back core portion 16 and the back core portion 17, which are adhesively fixed. Glasses 19a to 19d connect the head core portion 15, the back core portion 16 and the back core portion 17, respectively, and have a melting point lower than that of the glass 15h. A holding member 5a is fixed to the center core 15e of the head core portion 15 forming a magnetic circuit and has a sliding surface that slides smoothly on the recording medium.
Is a sliding surface, and 5b is a notch provided so as not to contact the recording / reproducing core 15a and the erasing core 15c of the head core portion 15.

Next, the manufacturing method will be described. First, the sliders 15b and 15d are provided, and the recording / reproducing coil 16c is wound around the head core portion 15 whose thickness and gap depth are appropriately processed, and the leg portion 16b of the back core 16a which is substantially L-shaped. A recording / reproducing back core portion 16 molded and protected by a synthetic resin, provided with coil terminal connection terminals and connected to the coil terminals, and an erasing coil on the leg portions 17b of the substantially L-shaped back core 17a. 17c is wound and molded and protected by a synthetic resin, and the erasing back core portion 17 provided with the coil terminal connection terminal and the coil terminal is connected to the back gaps 18a, 18
The thicknesses of b, 18c and 18d are adjusted and joined. Also,
The joining portion 5c of the holding member 5 is adhered to the center core 15e, and is heat-cured and fixed. Then, the polishing amount is obtained, the depth of the magnetic gap is adjusted, and the sliding surface is polished to adjust the surface roughness so that it can slide smoothly on the recording medium. After that, the depth of the magnetic gap is measured, and cleaning is performed. Then, the holding member 5 and the back core portions 16 and 17 are bonded to the support plate 12, and the connection portions 16f to h of the back core portion 16 and the connection portions 17f and 17g of the back core portion 17 are connected to the terminal portion 13 of the printed circuit board 13.
Electrical connection is made by joining a to e and soldering.

The operation is the same as that of the above-mentioned embodiment, so the explanation is omitted.

Since the invention shown in the fourth embodiment is constituted as described above, it has the following effects. Since the holding member does not sandwich the head core portion having the magnetic gap portion and is not in contact with the magnetic gap portion, it is possible to prevent an adverse effect on the magnetic gap due to the adhesive fixing of the holding member, and to obtain a magnetic head device having good magnetic characteristics. it can.

Further, since the magnetic gap portion of the head core portion and the holding member are not in contact with each other, it is possible to prevent the adhesive from wrapping around the magnetic gap portion and eliminate the step of removing excess adhesive residue.

Further, since the head core portion has the sliding member on the sliding surface with respect to the recording medium, the wear of the head core portion can be prevented.

Further, even when the holding member sandwiches the recording medium and uses a pair of magnetic head devices, the holding member can slide to the magnetic gap portion of the other magnetic head device to provide an optimum contact pressure when sliding. It has an area and can be formed into a simple shape as compared with a conventional holding member.

Further, the magnetic interference between the recording / reproducing magnetic flux and the erasing magnetic flux can be easily adjusted by adjusting the amount of the back gap with the adhesive layer.

Further, since the coil is wound directly on the magnetic body (leg) without passing through the bobbin, it can be made relatively small, and since it is fixed by molding with a synthetic resin, the coil is protected and insulated. Excellent in.

By making the back core substantially L-shaped, the coil winding work can be facilitated. Although the substantially L-shape has been described, it goes without saying that the I-shape or the like can similarly facilitate the winding work.

Although the fourth embodiment has been described with respect to the preceding erase type magnetic head device, the same effect can be obtained even with the tunnel erase type magnetic head device.

[0076]

Since the magnetic head device according to the present invention is constructed as described above, it has the following effects. Since the holding member does not sandwich the head core portion having the magnetic gap portion and is not in contact with the head core portion, it is possible to prevent adverse effects on the magnetic gap due to the adhesive fixing of the holding member, and it is possible to obtain a magnetic head device having good magnetic characteristics.

Further, since the head core portion and the holding member are not in contact with each other, the adhesive agent does not go around the magnetic gap portion and the sliding surface of the other recording medium, and the step of removing excess adhesive residue is eliminated.

Further, since the magnetic gap and the holding member are not in contact with each other, the adhesive does not wrap around the magnetic gap, and the step of removing excess adhesive residue is eliminated.

Further, even when the holding member sandwiches the recording medium and uses a pair of magnetic head devices, the holding member can slide the magnetic gap of the other magnetic head device so as to provide an optimum contact pressure when sliding. It has an area and can be formed into a simple shape as compared with a conventional holding member.

Further, since the holding member has the notch so as not to contact the magnetic gap, the adhesive does not wrap around the magnetic gap, and the step of removing excess adhesive residue is eliminated.

Further, the recording / reproducing core and the erasing core of the head core portion are substantially prismatic, and there is no fear of breakage of the leg portion, and it is expected that the yield of the head core portion with high added value is improved.

Further, since the head core portion has the sliding member on the sliding surface with respect to the recording medium, the wear of the head core portion can be prevented.

The same applies to a magnetic head device of the type in which the magnetic circuit portion has a recording / reproducing core and a center core that form a recording / reproducing magnetic gap and the center core and the erasing core form an erasing magnetic gap. It is possible to prevent an adverse effect of the holding member and also prevent wear of the head core portion.

Further, since the non-magnetic layer for separating the recording / reproducing magnetic circuit and the erasing magnetic circuit is provided in the back core portion joined to the center core, the magnetic characteristics are excellent.

Further, since the coil is directly wound around the back core portion (leg portion) without passing through the bobbin, the magnetic circuit portion can be made relatively small.

Further, since the mold is fixed with the synthetic resin, the coil is excellent in protection and insulation.

Further, since the cross-sectional areas of the magnetic fluxes of the back core portion and the head core portion are orthogonal to each other and the cross-sectional area of the back core portion is greater than or equal to the cross-sectional area of the head core portion, the back core portion is made of a material having a relatively small relative magnetic permeability. It is possible to secure the required magnetic flux as a whole by using.

Further, by using a magnetic material having a high saturation magnetic flux density for the head core portion, magnetic recording / reproducing characteristics are excellent.

Since the back core portion has the terminal portion of the winding coil, it is not necessary to draw the coil end.
It is possible to prevent disconnection due to contact with the support plate or the like.

Workability is improved by using an epoxy adhesive as the adhesive member, and strength can be increased by using glass.

Similarly, since the holding member does not sandwich the head core portion having the magnetic gap portion and is not in contact with the magnetic gap portion, it is possible to prevent an adverse effect on the magnetic gap due to the adhesive fixing of the holding member, and to provide a magnetic material having good magnetic characteristics. A head device can be obtained.

[Brief description of drawings]

FIG. 1 is an external view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the first embodiment of the present invention.

FIG. 3 is an external view showing a second embodiment of the present invention.

FIG. 4 is an external view showing a third embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a third embodiment of the present invention.

FIG. 6 is an external view showing a fourth embodiment of the present invention.

FIG. 7 is an external view showing a conventional magnetic head device.

FIG. 8 is an exploded perspective view showing a conventional magnetic head device.

FIG. 9 is a mounting example of a conventional magnetic head device.

FIG. 10 is an external view showing another conventional magnetic head device.

[Explanation of symbols]

1,8,10,14 magnetic head device, 2,15 head core part, 3,9,11 back core part, 16 recording /
Playback back core part, 17 erasing back core part, 5
Holding member, 5b Notch.

Claims (16)

[Claims] 1. A head core portion having a magnetic gap for performing at least one of magnetic recording, reproduction, and erasing, a back core portion forming a magnetic path with the head core portion, and a winding coil provided in the back core portion. And a holding member for holding the magnetic circuit unit, wherein the holding member is fixed to the back core part of the magnetic circuit unit. 2. The magnetic head device according to claim 1, wherein a gap is provided between the holding member and the head core portion. 3. The magnetic head device according to claim 1, wherein a gap is provided between the holding member and the magnetic gap of the head core portion. 4. The magnetic head device according to claim 3, wherein the gap is 1.2 mm or less. 5. The magnetic head device according to claim 1, wherein the holding member has a cutout portion at a portion facing the magnetic gap of the head core portion. 6. The head core portion has a recording / reproducing core for forming a recording / reproducing magnetic gap for magnetically recording or reproducing, and an erasing core for forming an erasing magnetic gap. 2. The magnetic head device according to claim 1, wherein the core and the erasing core are formed in a substantially prismatic shape except near the magnetic gap. 7. The magnetic head device according to claim 6, wherein the recording / reproducing core and the erasing core are provided with a sliding member that slides on the recording medium. 8. The head core portion has a recording / reproducing core and a center core for forming a recording / reproducing magnetic gap for performing magnetic recording or reproduction, and an erasing core for forming an erasing magnetic gap together with the center core. 2. The magnetic head device according to claim 1, wherein the recording / reproducing core and the erasing core are provided with a sliding member that slides on a recording medium. 9. The magnetic head device according to claim 8, wherein the back core portion has a non-magnetic layer in a portion forming a magnetic path with the center core portion. 10. The magnetic head device according to claim 1, wherein the winding coil is wound around the back core portion. 11. The magnetic head device according to claim 10, wherein the winding coil is wound around the back core portion, and the winding coil is molded with synthetic resin. 12. The magnetic head device according to claim 1, wherein the area of the back core portion is equal to or larger than the area of the head core portion in the area of the joint surface where the magnetic fluxes of the back core portion and the head core portion are orthogonal to each other. 13. The magnetic head device according to claim 12, wherein the magnetic material forming the head core portion has a characteristic of higher saturation magnetic flux density than the magnetic material forming the back core portion. 14. The magnetic head device according to claim 1, further comprising a terminal portion for connecting a terminal of the winding coil to the back core portion. 15. The magnetic head device according to claim 1, wherein the head core portion and the back core portion are joined by a synthetic resin or glass. 16. A head core part having a recording / reproducing core and a center core for forming a recording / reproducing magnetic gap for magnetic recording or generation, and an erasing core for forming an erasing magnetic gap together with the center core. A magnetic circuit section having a back core section that forms a magnetic path with the head core section, a winding coil provided in the back core section, and a holding member that holds the magnetic circuit section are provided. A magnetic head device characterized by being fixed to a center core.