JPH08153317A - Rotary magnetic head device - Google Patents

Abstract

PURPOSE: To eliminate the deterioration of performance and to enhance the productivity of assembling work by calking a relay terminal for electrical connection of a lead wire of a coil end of a rotary transformer. CONSTITUTION: Lead wires 20a and 20b are surely brought into contact with the relay terminal even at slit-formed pieces 24a and 25a successively after Y-shaped notches 24d and 25d as well, and moreover, the slit-formed pieces 24a and 25a are calked so that the relay terminal side is also plastically deformed to be surely in contact with the lead wires 20a and 20b. At this time, the lead wires are copper wires while the relay terminal is phosphor bronze, so that since the hardness of the copper wires are lower when they are compared, the constitution of plural contact spots is naturally attended with plastic deformation on the side of the lead wires. Thus, by performing on ultimate end parts of the lead wires, a disturbance element imposed on the ultimate end parts of the lead wires becomes difficult to be transmitted to other adjacent continuous contact parts, so that each contact part is maintained under its initial state to ensure stability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a video tape recorder (VTR) and a digital audio tape recorder (D).
The present invention relates to an improvement of a rotary magnetic head device used for AT) or the like.

[0002]

2. Description of the Related Art Conventionally, a rotary magnetic head device incorporates a rotary transformer for exchanging signals with a magnetic head. However, this rotary transformer can be treated as a fixed part which is a constituent member of the rotary magnetic head device. Currently, it is common to use a relay member for electrical connection integrally with an insulating member. The end of the signal transmission coil provided in the rotary transformer is an insulating member arranged in the rotary transformer. It is electrically connected to the relay member integrated with.
This electrical connection is generally made by soldering, but this is a method that requires skill, and the problem that unbalance with respect to rotational dynamic balance occurs due to a slight difference in the amount of solder at the connecting portion. was there. To solve this problem, various methods have been proposed that do not rely on soldering, but when the coil conductor is made thinner as the rotary magnetic head device becomes smaller and more multifunctional, for example, the coil end lead wire is fitted into the relay member. In the conventional method that responds only by plastic deformation of the coil lead wire conductor, there is a problem in reliability such as disconnection of the coil end lead wire, strength deterioration of the plastically deformed part, and disconnection over time depending on the deformation state. In addition, the manufacturing yield of the rotary transformer for electrically connecting the coil ends is reduced, and it is expensive because it requires a relay member with high molding accuracy.

Prior art relating to the conventional rotary magnetic head device includes, for example, the following techniques. As shown in FIG. 17, in electrical connection between a magnetic head (not shown) and a rotating-side transformer element 40 that constitutes a rotating transformer, a connector member 42 having a connecting terminal member 41 that is a relay member is integrated with a rotor core. An example of using the same after being disclosed is disclosed in Japanese Patent Application Laid-Open No. 62-250502, but this technique is one in which the coil member end portion 40a of the rotating side transformer element 40 and the connection terminal member 41 are connected by soldering. there were. Further, as shown in FIG. 18, in the electrical connection between the magnetic head 43 on the rotating side and the rotary transformer (rotor) 44, a terminal plate 46 having an elastic contactor 45 which is a relay member is integrated with the rotor 44. Japanese Patent Laid-Open No. 9012/1990 discloses an example in which an elastic contactor 45 is connected to a connection pattern 48 on a head base 47 to which the magnetic head 43 is connected. The terminal 49, which is the other end of 45, and the coil of the rotor of the rotary transformer are connected by soldering.

Further, as shown in FIG. 19, in the electrical connection between the rotor portion 50 of the rotary transformer and the magnetic head (not shown), the pressure contact type contactor 51 having the elastic cut-and-raised piece 51a is attached to the magnetic head. Japanese Patent Laid-Open No. 4-167201 discloses an example in which the connection is made by pressing the head substrate (not shown).
As disclosed in Japanese Patent Laid-Open Publication No. JP-A-2003-13869, this technique is to connect the end portion 52 of the coil of the rotary transformer and the pressure contact type contact 51 to the V-shaped groove 53 provided at the end of the pressure contact type contact 51. , The end portion 52 of the coil from which the insulation coating has been peeled off is fitted. Further, as shown in FIG. 20, the lead terminal 54 of the signal transmission coil of the rotary transformer and the slit-shaped conductive relay 5 are provided.
5 is electrically connected to the slit-shaped conductive relay 5
An example in which the lead end 54 of the coil is directly press-fitted into the slit portion 56 of No. 5 in a state where the insulating film is attached and the insulating film of the lead end 54 is cut to be connected is disclosed in JP-A-4-30.
As disclosed in Japanese Unexamined Patent Publication No. 1202, the technique is to press the conductor of the coil lead end 54 by the elastic force of the slit portion 56 to make the connection.

Further, as shown in FIG. 21, in an erasing magnetic head, a copper foil pattern 59 is provided on a terminal plate 58 which is a connecting member for relaying the head winding 57, and a resonance chip capacitor 60 is mounted in parallel. An example of doing is
As disclosed in Japanese Patent No. 5569, this technique was one in which a capacitor 60 was faced with solder. Further, as shown in FIG. 22, it is a relay member provided on the rotary portion 62 side of the rotary transformer for balance adjustment of the rotational dynamic balance in the rotary body including the upper cylinder (not shown) and the flywheel 61. Japanese Utility Model Publication No. 3-20901 discloses an example in which a printed board 63 is used and solder 65 is placed on a printed pattern 64 on the printed board 63 to perform balance adjustment.

[0006]

In order to make the structure of the rotary magnetic head device easy to assemble, it is relatively difficult to automate it by a robot or the like because it requires skill at each part to be electrically connected. It is very effective to reduce or eliminate the mounting work, and a structure in which each part is electrically connected by simply mechanically assembling the parts is desirable. Furthermore, it is important to ensure the reliability of the connecting portion while allowing the electrically connecting portion to perform the connection easily. Further, it is not preferable to use a special material in order to realize the above, because the price of a product such as a VTR for consumer use is increased and it is important to limit the use to a minimum necessary amount. Further, since the rotary magnetic head device is a rotating body, it is important to balance the rotation with respect to rotation and reduce the vibration in order to realize high performance of recording and reproduction (particularly with respect to jitter characteristics and noise). In addition, how easily the dynamic balance is taken is also important in terms of price for products such as VTRs for consumer use.

The above-mentioned prior art shows an example in which the connection between the rotor side of the rotary transformer and the magnetic head is improved, but there is a problem that the electrical connection is completed by soldering. In the prior art, an example in which the connection between the rotor side of the rotary transformer and the magnetic head is improved is shown, but the electrical connection is completed by the elastic contact between the elastic contactor and the connection pattern. However, the number of soldering points in the portion for making electrical connection in the assembly of the rotary magnetic head device is smaller than in the case of the prior art, but soldering still remains at the terminal on the terminal plate for connecting to the coil. There was a problem.

In the prior art, an example in which the connection between the rotor side of the rotary transformer and the magnetic head is improved is shown, and the elastic cut-and-raised piece of the pressure contact type contactor and the elastic contact between the head substrate and The V-shaped groove is formed in the terminal of the pressure contact type contactor so that the electrical connection is completed by fitting the coil with the coil instead of by soldering, but soldering is still necessary in other parts. However, there was a problem that the number of soldering points was not reduced as a whole. Further, the related art is an example of improvement on the stator side of the rotary transformer, but in order to secure reliability in the electrical connection between the slit-shaped conductive repeater and the coil, the relationship between the slit width and the conductor diameter is used. Has to be strictly controlled, and the slit width needs to be made narrower as the conductor diameter becomes smaller. Therefore, there is a problem that those with strictly controlled slit width are expensive in price. Further, since the wire rod becomes thin, there is a problem that the wire rod is inserted into the slit portion, which causes a problem of disconnection, which causes a problem of a decrease in manufacturing yield, resulting in an increase in price.

In the prior art, the coil and the relay member are electrically connected to each other without brazing such as soldering, but the forming is performed to lead the coil end lead wire to the end of the relay member. No consideration was given to the work. For this forming work, for example, in the case of a disk-shaped rotary transformer, it is common to guide the work through the outer peripheral portion of the transformer core, and the transformer core on the side opposite to the facing surface side as the rotary transformer. There is also a method of pulling out from a hole penetrating the surface, but it is not so common. In any case, the coil end lead wire is linearly arranged from the coil outlet provided in the transformer core to the connection portion with the relay terminal. In this case, the forming work is easier if the extra length of the coil end lead wire is pulled,
After the connection with the relay member is completed and the extra length is removed, the rotary transformer is assembled, but at this time, the other end of the relay member or the like is placed on the line in the direction in which the extra length of the coil end lead wire is pulled. If there is a relay member of the above, there is a problem that these members interfere with each other to cause deformation of the relay member etc. (especially when using elastic deformation to connect to the magnetic head side, its contact part However, in the case of the prior art, these considerations were not made.

Since each of the prior arts 1 to 3 uses soldering, the use of a solder having a high specific gravity among the constituent members of the rotary magnetic head device means that the amount of solder used in the connecting portion is large. The slight difference between the two causes the rotational movement balance of the rotary drum to be lost. When a rotary magnetic head device is assembled using a rotary transformer (rotor) having a factor that causes imbalance due to solder, any one of the members that finally constitutes the rotary drum of the rotary magnetic head device is Method (a method for making additional holes in the component members) to balance the rotational movement, and to reduce the number of assembly steps of the rotary magnetic head device, the electrical connection with the magnetic head, etc. Although some areas were improved, other areas needed further improvement. Also, reduce the rotating drum diameter,
Further, as a consideration for a rotary magnetic head device in which a relatively large number of magnetic heads are arranged, the reduction in the size of the head base, which is the connecting member on the magnetic head side, shown in the prior art means that the size of the conventional art is small. There is a problem that there is no space on the magnetic head side to attach a capacitor arranged when functioning as the erase head shown.

According to the present invention, in order to solve the above problems, the electrical connection of the coil end lead wire of the rotary transformer is performed by caulking with a relay terminal, there is no performance deterioration, reliability is good, work is easy, and assembly is easy. An object of the present invention is to provide a high-performance rotary magnetic head device that has high productivity of work, can be easily assembled automatically by a robot, etc., and can easily balance rotational motion by using an assembled rotary transformer. And

[0012]

In order to achieve the above-mentioned object, a rotary magnetic head device of the present invention comprises a magnetic head, and a rotary rotary transformer composed of a rotary transformer core and a signal transmission coil is attached. The magnetic head comprises: a rotary drum; and a fixed drum having a fixed-side rotary transformer, which is composed of a fixed-side transformer core and a signal transmission coil, facing the rotary-side rotary transformer. In a rotary magnetic head device for transmitting and receiving a signal to and from, a disk-shaped insulating member R provided with a conductive relay member on the rotating-side transformer core.
The T end is fixed, and the coil end lead wire of the signal transmission coil embedded in the groove of the rotating-side transformer core is brought into contact with a predetermined portion of the conductive relay member, and the coil end lead wire and the conductive portion are contacted at the contact portion. The rotary relay has a rotary transformer in which the sex relay member is plastically deformed to make electrical connection by contact at a plurality of locations.

Further, in the rotary magnetic head device of the present invention, the coil end lead wire at the contact portion between the coil end lead wire of the signal transmission coil and the conductive relay member is soldered on the conductor surface after the insulating film is removed. The alloy is welded. Further, in the rotary magnetic head device of the present invention, the conductive relay member at the contact portion between the coil end lead wire of the signal transmission coil and the conductive relay member has a metal film different from the metal of the conductive relay member on the surface. It has been applied to.

Further, in the rotary magnetic head device of the present invention, the conductive relay member is a cut-and-raised piece for connecting the coil end lead wire of the signal transmission coil to a predetermined portion of the conductive relay member by caulking. Is to have. Further, in the rotary magnetic head device of the present invention, the conductive relay member has a cut-and-raised piece that is erected to make a hole at a predetermined portion of the conductive relay member.

Further, in the rotary magnetic head device of the present invention, the conductive relay member is cut along a diagonal line of the square so as to make a square hole at a predetermined portion of the conductive relay member, and the conductive relay member is erected on both sides from the center side. It has a raised raised piece.
Further, in the rotary magnetic head device of the present invention, the rotary side rotary transformer is a cut-and-raised piece whose one end is connected by caulking the coil end lead wire to the RT tank on the rotary side transformer core attached to the rotary side rotary transformer. And a conductive relay member having an elastic contactor having the other end elastically connected to the relay substrate for connecting the magnetic head, wherein the coil end lead wire is bent in a substantially central direction from an outer peripheral portion of the rotating-side transformer core. The position of the cut-and-raised piece of the conductive relay member is on an extension line in the bending direction of the coil end lead wire of the rotating side transformer core, and the coil end lead wire is an outer peripheral portion of the rotating side transformer core. The elastic contact of the conductive relay member is located at all the coil end lead wires within a range where the elastic relay is bent in the substantially central direction and reaches the center of the rotation-side transformer core. Ri bending is obtained by so as not on the extension of the direction.

Further, in the rotary magnetic head device of the present invention, the rotating side rotary transformer has two conductive relay members for connecting to the coil end lead wires corresponding to one signal transmission coil, which are insulating members. A plurality of integrated relay unit members are arranged on the disk-shaped insulating member on the same circumference, and an RT tank is fixed on the rotating-side transformer core. Further, in the rotary magnetic head device of the present invention, the rotary rotary transformer is arranged in the RT tank on the rotary transformer core attached to the rotary rotary transformer, and the two conductive relay members are integrated by an insulating member. A capacitor is connected between two conductive relay members of at least one of the relay unit members that have been converted into a relay unit member.

Further, in the rotary magnetic head device of the present invention, the rotary transformer includes the disk-shaped insulating member of the RT transformer on the rotary transformer core attached to the rotary transformer and the same circle on the RT transformer. A relay unit member in which two conductive relay members arranged on the circumference are integrated by an insulating member is constituted by an insulating member made of a different material,
Regarding the heat resistance of the insulating member, the heat insulating property of the insulating member of the relay unit member is higher than that of the disc-shaped insulating member. Further, the rotary magnetic head device of the present invention is
The rotating-side rotary transformer has a plurality of mounting bosses arranged on the same circumference on a disk-shaped insulating member forming an RT tank on the rotating-side transformer core mounted on the rotating-side rotary transformer. The relay unit member in which the members are integrated by an insulating member is fitted, and a part of the mounting boss is plastically deformed to fix the relay unit member.

Further, in the rotary magnetic head device according to the present invention, the rotary transformer has the signal transmission coil embedded in the groove of the mounted transformer core, and the conductor diameter of the coil wire of the coil is small. It is 0.1 mm or more.
In the rotary magnetic head device of the present invention, the rotary drum is
Arranging a plurality of mounting bosses on the same circumference on a disk-shaped insulating member that constitutes an RT tank fixed on the rotating-side transformer core of the rotating-side rotating transformer mounted on the rotating drum,
The balancer is equipped with a required relay unit member, and in order to correct the rotational motion balance of the rotary drum, a balancer is fitted into a required mounting boss on the RT tank, and a part of the mounting boss is plastically deformed to balance the balancer. Is fixed.

[0019]

A rotary magnetic head device according to the present invention is provided with a magnetic head, and a rotary drum to which a rotary rotary transformer composed of a rotary transformer core and a signal transmission coil is attached, and a rotary drum facing the rotary drum. A rotary magnetic head device, comprising: a fixed drum having a fixed rotary transformer composed of a fixed transformer core and a signal transmission coil, and transmitting and receiving a signal to and from the magnetic head via the rotary transformer. And a disk-shaped insulating member provided with a conductive relay member on the rotating-side transformer core.
The T end is fixed, and the coil end lead wire of the signal transmission coil embedded in the groove of the rotating-side transformer core is brought into contact with a predetermined portion of the conductive relay member, and the coil end lead wire and the conductive portion are contacted at the contact portion. The sex relay member is caulked at the same time to be plastically deformed, and electrical contact is made by contact at a plurality of places to assemble and manufacture a rotary transformer.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before explaining the embodiments, the basic matters of the present invention will be explained. The following is performed on the contact portion of the relay member that electrically connects the coil end lead wire of the rotation side rotation transformer. The surface of the relay member is surface-treated by plating with a dissimilar metal such as gold. As the material of the relay member having the spring portion at the end, a phosphor bronze material is generally used in many cases, but since the surface is easily corroded, the surface state of the contact portion is stabilized by performing a treatment such as gold plating. As the coil, a polyurethane insulating film copper wire having a self-welding layer that exhibits an adhesive force with a solvent or the like is generally used on the outer circumference of the coil wire. When the coil end lead wire with this insulation layer is dipped in a molten solder bath and pulled up, the insulating film in the dipped portion is melted by heat, and a coil end lead wire with a solder alloy attached to the lead conductor surface is obtained. Therefore, it is used as it is as a contact portion for contact with a relay member or the like.

The insulating film is removed, and the coil end lead wire to which the solder alloy is attached is subjected to a surface treatment such as gold plating so as to wrap it with a relay member having a chemically stable surface to perform caulking. This wrapping caulking structure is very effective for disconnection because it does not change the conductor cross-sectional area when it comes into contact with the coil end lead wire that has a small conductor diameter. Although the contact state can be stabilized, it cannot be effectively used for a coil end lead wire having any thin conductor diameter. Therefore, the conductor diameter is limited to 0.10 mm or more. The electrical connection has a structure in which the respective members are in contact with each other at a plurality of points with plastic deformation. This is because it is not reliable to form the contact part only by plastic deformation of the member on one side, so that in one connection, there are multiple places to contact so that both members plastically deform. Stabilizes the connection as a simple structure. Furthermore, by performing the caulking part, which is one contact part, on the coil end side, the external force applied to the final end part of the coil will not be transmitted to other parts and the displacement of other contact parts will be eliminated. The structure is such that the initial state of the contact area can be maintained.

In the caulking structure, a cut-and-raised piece is provided in a part of the relay member, and the cut-and-raised piece is used to plastically deform the relay member so as to wrap the coil end lead wire from the outer periphery. The cut-and-raised piece is formed so as to make a hole in the relay member, so that it is not necessary to enlarge the expanded shape of the relay member, and the relay member corresponding to the lead wire at the winding start and the winding end of the coil is arranged closely. To do. This is effective in reducing the diameter of the rotary transformer (rotary magnetic head device). In addition,
The cut-and-raised pieces should be separated at a position along the diagonal line of the cut-and-raised hole and evenly raised on both sides parallel to the extension direction of the coil end lead wire, and the shape of the cut-and-raised pieces in the direction perpendicular to the extension direction should be set. The cut-off part has a mountain shape with a ridgeline, and the peak of the mountain has an acute angle. By using the cut-and-raised piece having such a structure, a large winding margin around the lead wire conductor in the caulking portion can be taken, and the height of the cut-and-raised piece can be maximized with a minimum space margin. be able to. Moreover, mechanical stability of the caulked portion can be achieved without affecting the distance between terminals.

The rotary transformer incorporated in the rotary magnetic head device not only stabilizes the contact portion by electrical connection without brazing the signal transmission coil and the relay member, but also the coil end to the relay member. A VTR for consumer use by taking into consideration the structure and arrangement of the relay member that simplifies the way of leading the lead wire and the connection work and the material of the insulating member that fixes the relay member. As a result, it is an extremely important factor because it has the effects of being able to speed up the assembly per unit time, being able to perform automatic assembly by a robot, etc., and being able to be constructed from inexpensive materials. In the rotary magnetic head device, when the connection between the rotary transformer and the magnetic head is configured to make elastic contact with the other end of the relay member provided on the rotor side of the rotary transformer, the other end of the relay member is The structure has a contact portion that makes elastic contact with the head side, and this elastic contact portion is relatively easily deformed by an external factor because of the structure. Therefore, when the end portion of the coil for signal transmission is guided to the end portion of the relay member, the relay member is arranged so that the extra length portion (for all coils) of the coil end lead wire does not interfere with the elastic contact portion. . This is important for improving workability in assembling the rotary transformer and improving yield and reliability regarding connection with the magnetic head on the rotary magnetic head device.

When the rotary transformer has a disk shape, the insulating member having the relay member attached to the rotor core of the rotary transformer is attached to the surface opposite to the opposite surface side functioning as the rotary transformer, and the signal transmission coil is attached. Has a structure in which it is bent from the outer peripheral side of the rotor core in a substantially central direction and is linearly guided to one end of the relay member. in this case,
The coil end lead wire is longer than the length to connect to the relay member, and the excess length is pulled into contact with the contact point with the relay member. The part is removed. This extra length portion does not interfere with all of the elastic contact portion that is the other end portion of the relay member, which improves the workability of forming the coil end lead wire,
The probability of deforming the elastic contact portion associated with this work can be reduced. The relay member attached to the disk-shaped rotary transformer is integrated as an relay unit member by integrating two relay members that make contact with the coil end lead wires corresponding to the winding start and winding end of one signal transmission coil with an insulating member. Because of the function of the coil, the coil ends corresponding to the winding start and winding end are located at approximately the same position (if the winding start and winding end are separated, the number of windings as a coil will not be an integer). However, the corresponding relay members must necessarily be arranged close to each other, but shortening the distance between the relay members leads to downsizing of the relay unit member, and consequently the rotary magnetic head device (rotary transformer).
This is an important factor in reducing the size and diameter of the.

Further, by arranging a plurality of the relay unit members on the disc-shaped insulating member, an insulating member made of a material different from the insulating member used for the relay unit member is selected for the disc-shaped insulating member. be able to. This is effective when the chip capacitor is connected (soldered) between the terminals of the relay unit member or when the above-mentioned signal transmission coil and the relay member cannot be connected without brazing. For the insulating member used for this relay unit member, select a material that has heat resistance that does not deform due to the heat of soldering, and use it as a disc-shaped insulating member that has a larger volume than these members (the amount of material used is large). Selects an inexpensive material because it does not need to have such heat resistance. It is possible to suppress an increase in the price of the rotary magnetic head device (rotary transformer) by limiting the use of high-grade and expensive materials to the minimum necessary amount. Moreover, the connection by soldering of the chip capacitor can be performed independently only in the unit relay member, and if the unit relay member to which the chip capacitor is connected in advance is attached to the disc-shaped insulating member, the disc-shaped insulating member due to heat such as solder will Any deformation can be removed.

Arranging the relay unit members on the same circumference on the disk-shaped insulating member at positions symmetrical with respect to the rotation axis is important for maintaining the rotational dynamic balance. When the relay unit members are arranged and fixed on the same circumference on the disk-shaped insulating member, if the shape is such that a part of the disk-shaped insulating member is plastically deformed so as to fill the recess provided in the relay unit member, Since the shape of plastic deformation partly changes but does not change in volume, the degree of influence on the rotational dynamic balance of the disk-shaped insulating member is very small because the change of the center of gravity is extremely small. However, when the magnetic head and other components arranged in the rotary drum cannot be symmetrical with respect to the rotation axis,
Place a balancer to forcibly balance the rotational movement. If a method of plastically deforming a part of the component part used when fixing the relay unit member provided on the disk-shaped insulating member is attached to this balancer, a balancer corresponding to the amount of unbalance expected in advance can be arranged. Even if it is fixed, the change of its center of gravity is extremely small, so that a highly accurate balance can be maintained.

The relay unit member is generally formed by insert-molding a pair of relay terminals made of a flat metal material press-molded from a single base material into a predetermined shape into an insulating member such as plastic to form an integral unit. It is manufactured by bending the relay terminal portion into a predetermined shape after being formed. At this time, if a cut-and-raised piece that is crimped so as to wrap around the coil end lead wire is formed on the outer peripheral portion of the relay terminal, the distance between the terminals of the relay terminals arranged in close proximity is apparent when the cut-and-raised piece is expanded. To
About twice the height of the cut-and-raised piece will be separated further,
In order to reduce the distance between the relay terminals, the height of the cut-and-raised piece must be reduced, which is contrary to the stability of the connecting portion. Therefore, if the cut-and-raised piece is configured to make a hole in the relay terminal, the cut-and-raised piece having a height substantially equal to the width of the relay terminal can be formed within the width of the relay terminal, so that the expanded shape of the terminal is large. Therefore, the distance between the relay terminals can be reduced.

FIG. 1 shows a rotary magnetic head device according to the present invention.
~ It demonstrates using the Example shown in FIG. Figure 1
FIG. 3 is a sectional view of a main part of the rotary magnetic head device according to the present invention.
In FIG. 1, 1 is a fixed drum, 2 is a rotating drum, 3
Is a shaft for rotatably holding the rotary drum 2, 16
Is a bearing that allows the shaft 3 to rotate, and 13 is
A motor member (rotor) connected to the shaft 3, 14 is a motor member (stator), 6 is a magnetic head attached to the outer peripheral portion of the rotary drum 2, 7 is a head base to which the magnetic head 6 is attached, and 8 is , A relay board 4 for electrical connection of the magnetic head 6 provided on the head base 7, 4 is a fixed side transformer core (stator core) fixed to the fixed drum 1 side of the rotary transformer (rotary transformer), and 5 is a rotary transformer. A rotating-side transformer core (rotor core) 9 fixed to the rotating drum 2 side is an RT tank made of a disk-shaped insulating member fixed on the rotating-side transformer core 5.

A fixed-side transformer core 4 is fixed to the fixed drum 1 of the rotary magnetic head device according to the present invention, and a signal transmission coil is embedded in a surface of the fixed-side transformer core 4 facing the rotating-side transformer core 5. The flexible insulating substrate 12 provided with a wiring pattern for connection with the signal transmission coil is fixed to the core back surface opposite to the facing surface. An end portion of the flexible insulating substrate 12 is drawn out from a hole provided in a lower side surface of the fixed drum 1 and is connected to an external circuit for signal transmission of the rotary magnetic head device. Further, below the fixed drum 1, a rotor 1 that is a motor member of a motor that generates a driving force for the rotating drum 2.
3, the stator 14, and the signal board 15 are assembled.

The rotary drum 2 of the rotary magnetic head device is rotatably held by a shaft 3 via a fixed drum 1 and a bearing 16, and a plurality of magnetic heads 6 are arranged on the outer peripheral portion of the rotating rotary drum 2. Has been done. Transmission and reception of signals to and from the plurality of magnetic heads 6 arranged on the rotating rotary drum 2 are performed by a plurality of fixed-side transformer cores 4, a rotating-side transformer core 5, and a plurality of buried in grooves provided in each transformer core 4, 5. This is performed by a known rotary transformer composed of a number of signal transmission coils corresponding to the number of magnetic heads 6 in FIG.
The embodiment of FIG. 1 shows an example of five channels in which five signal transmission coils and two short rings are arranged in seven grooves.

FIG. 2 is a plan view (a), a sectional view taken along the line A--A, and a sectional view (c) of the rotating side rotary transformer used in the rotary magnetic head device according to the present invention, which has, for example, a 5-channel structure. It is a bottom view. In FIG. 2, 20 is a signal transmission coil buried in a groove on the lower surface of the rotating transformer core 5, 22 is a relay unit member, 23 is an insulating member for relay unit member that constitutes the relay unit member 22, and 24 and 25. Is
Relay terminals constituting relay unit member 22, 24a and 2
5a is a cut-and-raised piece provided at the ends of the relay terminals 24 and 25,
24b and 25b are elastic contacts provided at the ends of the relay terminals 24 and 25, 26 is a balancer, and 20a and 20b.
b is a lead wire of the signal transmission coil 20, and 5a is a lead wire 20a, 20b provided on the lower surface of the rotating-side transformer core 5.
Draw-out grooves 5b for drawing out are shown as cutout grooves provided on the outer peripheral surface of the rotating-side transformer core 5 following the draw-out groove 5a.

As shown in FIG. 2, the electrical connection in the rotary side rotary transformer of the rotary transformer is such that the surface of the rotary side transformer core 5 opposite to the surface facing the fixed side rotary transformer (see FIG. 2B). ), An RT tank 9 including a disk-shaped insulating member and a relay unit member that are coaxially bonded and fixed.
Do it above. On the RT tank 9 (see FIG. 2 (a)),
The two relay terminals 24, 25 for connecting the coil end lead wires of one signal transmission coil are connected to the relay unit member insulating member 2
The relay unit members 22 integrated in 3 are arranged and fixed on the same circumference with respect to the rotation axis according to the number of magnetic heads. In the embodiment, the number of the magnetic heads 6 is 5, and in the arrangement of the embodiment, the dynamic balance with respect to the rotating shaft is unbalanced. Therefore, for example, a brass material balancer 26 is arranged at a required position in order to achieve the rotational dynamic balance. are doing. The relay unit member 22 and the balancer 26 are fixed onto the RT tank 9 by attaching the mounting boss 2 provided in advance to the RT tank 9.
7 is fitted with the relay unit member 22 and the balancer 26,
The tip side of the mounting boss 27 is plastically deformed and fixed. The coil end lead wires 20 a and 20 b of each signal transmission coil 20 embedded in the groove provided on the lower surface of the rotating-side transformer core 5 (see FIG. 2C) are integrated with the relay unit member 22. The cut-and-raised pieces 24a and 25a provided at one end of the relay terminals 24 and 25, which are conductive relay members, are caulked and connected. It should be noted that the coil shown in FIG. 2C is expressed only partially, and the short ring is omitted.

Further, the other ends of the relay terminals 24 and 25 integrated with the relay unit member 22 have elastic contacts 24b and 25b having a shape having elasticity, and the head base 7 (see FIG. 1). It makes elastic contact with the upper relay substrate 8 to electrically connect to the magnetic head 6. Note that the relay terminal 2 is provided for a portion that is electrically connected to the magnetic head by elastic contact.
Both surfaces of the wiring patterns 4 and 25 and the pattern of the relay substrate 8 on the head base 7 are subjected to surface treatment by gold plating or the like to stabilize the contact portion. A brass material having a high specific gravity is used for the head base 7.

The disc-shaped insulating member 9'constituting the RT tank 9 is made of a plastic material having a lower heat resistance than the insulating member 23 for the relay unit member constituting the relay unit member 22. There is. As an example, a PPS (Poli-phenylene Sulfide) resin is used for the disk-shaped insulating member 9 ′ in order to share it with a rotary magnetic head device in which a chip-type capacitor is connected on a relay unit member 22 described later. A liquid crystal polymer (Liquid C
rystal Polymer) resin was used. However, when it is not necessary to dispose the chip type capacitor on the relay unit member 22, the relay unit member insulating member 23 and the disk-shaped insulating member 9'are made of a lower grade ABS (Acrylonitril).
e-Butadiene-Styrene) resin or the like may be used.

Signal transmission coil 20 (see FIG. 2C)
The coil end lead wires 20a (start of winding) and 20b (end of winding) of the coil end lead wire 5a are formed on the lower surface side of the rotating-side transformer core 5 through the radially extending lead-out grooves 5a, and cutout grooves 5b provided on the outer peripheral portion of As described above, it is bent to the upper surface side of the rotating-side transformer core 5 provided with the relay unit member 22. At this time,
Relay terminals 24, 25 for coil end lead wires 20a and 20b
The insulating film is removed from the portions that come into contact with the cut-and-raised pieces 24a and 25a and subjected to soldering treatment (not shown). The coil end lead wires 20a and 20b are
Notch 2 for guiding the lead wire provided on the outer periphery of the tank 9
A forming process is performed by pulling the rotating transformer core 5 in a substantially central direction via 8.

This forming process will be briefly described with reference to FIGS. 9 to 11 which are explanatory views concerning forming of the coil end lead wire of the rotating rotary transformer.
The detailed description of FIGS. 9 to 11 will be given later.
FIG. 9A is an enlarged plan view of an essential part in a state where the forming is finished and the lead wire is arranged at the center of the caulking cut-and-raised piece, and FIG. 9B is a side view. FIG. 10 (a) is shown in FIG.
From the state of (a), the cut-and-raised piece is laid down and caulked,
FIG. 10B is an enlarged plan view of an essential part in a state where the extra length of the lead wire is cut, and FIG. FIG. 11 is an explanatory view of the caulking operation for changing the state of FIG. 9 to the state of FIG.
FIG. 11A is a sectional view taken along line AA of FIG.

In the forming process, as described above, the end portions of the lead wires 20a and 20b pulled from the lower surface side of the rotating-side transformer core 5 through the lead wire guide notch 28 are moved to the inner diameter side of the RT tank 9. The rising grooves 29 provided are guided so as to pass therethrough and pulled, and the rising grooves 29 are bent and plastically deformed. As a result, the lead wires 20a and 20b linearly pulled from the lead wire guide notch 28 toward the rising groove 29 are provided for crimping provided at the ends of the relay terminals 24 and 25 which are fixed in advance. The cut-and-raised pieces 24a and 25a are located at substantially the center of each. In this way, the lead wire 20
After arranging a and 20b on the cut-and-raised pieces 24a and 25a, push them down to crimp the cut-and-raised pieces 24a and 25a, and crimp the lead wires 20a and 20b so as to wrap them. The electrical connection is made without any twist.

The elastic contact 24b at the other end of the relay terminals 24, 25 is located on the extension line between the outermost circumference and the innermost circumference of the rotating transformer core 5 in the direction in which the lead wires 20a, 20b are pulled. , 25b are not located. This forming process is performed by the lead wire 20.
a and 20b and the elastic contacts 24b and 25b do not interfere with each other, and the positioning of the relay terminals 24 and 25 by simply pulling the lead wires 20a and 20b linearly is taken into consideration. The assemblability can be greatly simplified. In addition, a forming process was performed (see FIGS. 9A and 9B).
The subsequent caulking process is performed by the caulking tool 3 as shown in FIG.
Since the caulking at a plurality of locations can be performed only by performing the operation in one direction at 8, the assembling property can be greatly simplified as compared with the conventional method of performing connection work by soldering which requires skill.

After the caulking process, the extra length portions of the lead wires 20a and 20b are cut and removed (see FIG. 1).
0 (a), (b)), the rotary transformer is completed, but as another means, it is possible to carry out the caulking process and the extra length cutting at substantially the same time. Note that the example is an example of using a thin wire having a coil conductor diameter of about 0.2 mm, but generally, when the wire becomes thin, even if the lead wire is bent, the shape does not become constant when the tensile force is released. It is normal. For this reason, the lead wire is positioned at a linearly stretched portion as in the embodiment, and for example, a rising groove 29 for guiding is used to hold the straight portion.
It is necessary to consider bending the extra length of the lead wire and plastically deforming it.

FIGS. 3A and 3B are (a) a plan view, (b) an AA sectional view, and (c) a fixed-side rotary transformer used in the rotary magnetic head device according to the present invention, for example, having a 5-channel configuration. It is a bottom view. In FIG. 3, reference numeral 30 denotes a signal transmission coil embedded in a groove on the upper surface of the fixed transformer core 4, and reference numerals 30 a and 30 b denote coil end lead wires of the signal transmission coil 30. Note that the same reference numerals as those used in FIG. 3 used so far are the same, and the description thereof will be omitted. In the embodiment of FIG. 3, the fixed-side transformer core 4
5 in the 7 grooves on the surface facing the rotating side transformer core 5
One signal transmission coil 30 and two short rings 31
Are embedded, and a flexible insulating substrate 12 provided with a wiring pattern for connection with the signal transmission coil 30 is fixed to the core back surface opposite to the facing surface. The signal transmission coil 3 is provided on the connection pattern portion provided on the arc-shaped portion fixed to the fixed-side transformer core 4 of the flexible insulating substrate 12.
The coil ends 30a and 30b of 0 are connected by soldering or the like. It should be noted that with respect to FIG. 3, description of the coil and the short ring is omitted.

FIG. 4 shows a rotary side rotary transformer of another embodiment used in the rotary magnetic head device according to the present invention, for example (a) a plan view in the case of a three-channel configuration,
(B) A-A sectional view, (c) is a bottom view. The rotating side rotary transformer of FIG. 4 is an example in which the number of channels is three, which is smaller than that of the five channels shown in the embodiment of FIG.
One of the channels is made to function as an erasing magnetic head, a capacitor is added to the rotating side of the rotary transformer to cause resonance, and the erasing power is reduced. In particular, a contact member used for the electrical connection between the rotary transformer and the magnetic head used in the embodiment of FIG. 2, a relay unit member such as a relay terminal to which a signal transmitting coil of the rotary transformer is connected, and RT. This is an embodiment in which the tank and other members are shared with the 5-channel rotary side rotary transformer used in the embodiment of FIG.

The capacitor added for resonance of the erasing magnetic head is electrically connected in parallel to the inductance of the magnetic head and the rotating rotary transformer, and is a coil of the magnetic head or the rotating rotary transformer. Need to be placed near. On the other hand, when the rotary magnetic head device is reduced in size and diameter and the electrical connection between the rotary transformer and the magnetic head is made by elastic contact, the elastic contact portion is stabilized against relative displacement of the elastic contact portion. Need to be considered. When the capacitor is arranged near the magnetic head while considering the stabilization of the elastic contact portion, the head base 7 to which the magnetic head is fixed (see FIG. 1).
It is not possible to make the elastic contact pattern on the surface of the relay substrate 8 to which the end portion of the magnetic head coil provided above is relatively small relative to the size of the head base 7 to be downsized. It is physically difficult to dispose the capacitor on the relay board 8. Further, it is preferable that the pattern on which the coil end for the magnetic head is soldered is close to the elastic contact pattern because the reliability of the elastic contact is deteriorated by contaminating the elastic contact pattern with solder flux or the like. Instead, it is desirable that the capacitor is connected to the rotary transformer side. In FIG. 4, only a part of the coil is represented, and the short ring is omitted.

FIG. 5 shows an RT tank 9 in which a relay unit member 22 is arranged on a disk-shaped insulating member 9'used in the embodiment of the rotary rotary transformer shown in FIG. ) Plan view, (b) A-O-A sectional view,
FIG. 6C is a bottom view, and FIG. 6 is a cross-sectional view of the relay unit member 22 of the RT tank 9 shown in FIG. The RT tank 9 shown in FIG. 5 is used when the diameter of the coil lead wire conductor is 0.2 mm, which is relatively small. As in the embodiment shown in FIG. 2, RT is used as five channels.
When the tank 9 is used, it can be dealt with by increasing the number of the relay unit members 22. As will be described later, the relay unit member 22 includes two types of relay unit members 22 depending on the arrangement direction of the elastic contacts 24b and 25b.
As shown in FIG. 6, the elastic contacts 24 at the ends of the relay terminals 24 and 25 of the relay unit member 22 arranged on the RT tank 9.
When the b and 25b elastically contact the pattern of the relay substrate 8 on the head base 7 (see FIG. 1), the operation is not limited by the recessed portion provided in the RT tank 9.

In FIG. 7, the relay terminal 24,
25 is another example of the RT tank 9 in which 25 is arranged, (a) plan view, (b) AOA sectional view, (c) bottom view.
The RT tank 9 shown in FIG. 7 is used when the coil end lead wire conductor diameter is 0.4 mm, which is relatively large.
The relay terminals 24 and 25 are directly inserted and fixed onto the disk-shaped insulating member 9 ′ without disposing the relay unit member 22 such as the RT tank 9 shown in FIG. 8 is shown in FIG.
It is a detailed explanatory view of the RT tank 9 shown in FIG. Figure 8 (a)
Is an enlarged view of the portion P in the plan view of FIG. 7A, and FIG.
8A is a sectional view taken along line X-X of the enlarged view of the P portion in FIG.
8A is a sectional view taken along line YY of the enlarged view of the P part in FIG. 8A, and FIG.
FIG. 8A is a ZZ sectional view of the enlarged view of the P portion. FIG.
As shown in FIGS. 8A and 8B, the relay terminal 24,
25 is positioned and fixed by inserting the fixing ribs 24e and 25e into the disk-shaped insulating member 9'which is a base material.

The RT tank 9 shown in FIG. 7A has a structure capable of handling up to 12 channels.
4 shows an example in which 4 and 25 are arranged for 10 channels, and the arrangement and the number of relay terminals 24 and 25 can be set up to a predetermined number when the number of magnetic heads is increased or decreased like the RT tank 9 shown in FIG. It is a form that can be changed and handled. In addition,
Illustration of a rotary transformer using this RT tank 9 is omitted. Generally, the end portion of the coil end lead wire has a property that, even if the lead wire portion is shortened, the end portion of the coil end lead wire has a large diameter of about 0.4 mm, but maintains a constant shape even if the pulling force is released. There is. In this case, it is not necessary to consider the rising groove 29 or the like provided for coil guidance such as the RT tank 9 shown in FIG. Further, since it is not necessary to provide the extra length portion of the lead wire, the elastic contactors 24b and 25b for making elastic contact with the magnetic head are positioned on the extension line of the lead wire bending direction.

FIG. 9 is an explanatory diagram of forming around the relay unit member which makes electrical contact with the coil end lead wire of the rotary rotary transformer shown in FIG. 2, and FIG. FIG. 3B is an enlarged plan view of an essential part showing a state before crimping one piece, and FIG. FIG. 10 is an explanatory diagram of forming around the relay unit member that makes electrical contact with the coil end lead wire of the rotary rotary transformer shown in FIG.
9A is an enlarged plan view of an essential part showing a state in which the cut-and-raised piece is tilted and caulked from the state of FIG. 9A, and the extra length portion of the lead wire is cut, and FIG. 9B is a side view. Show. FIG. 11 is an explanatory view of a morphological change of the cut-and-raised piece before and after the crimping from the state of FIG. 9 to the state of FIG. 10, and FIGS.
It is an AA principal part sectional view of (a).

As shown in FIGS. 9 (a) and 9 (b), the coil end lead wires 20a, 20b pass through the lead-out groove 5a provided on the lower surface side of the rotating transformer core 5, and are provided on the outer peripheral side surface. The relay unit member 22 is bent along the cutout groove 5b to the upper surface side of the rotating-side transformer core 5. When the lead wire conductor diameter has a small conductor diameter of about 0.2 mm, the coil end lead wires 20a and 20b are bent and subjected to the above-described forming process to cut and raise the relay terminals 24 and 25. The lead wire is positioned at the center of 24a and 25a. When the lead wire conductor diameter is increased to about 0.4 mm, R as shown in FIG.
A forming process is performed by using the T-tans 9 and bending the lead wires in the substantially central direction of the transformer core without providing an extra length portion of the lead wire, and then, the cut-and-raised portion 24 of the relay terminals 24, 25 is formed.
The lead wire is positioned at the center of a, 25a. In addition, the lead wire which has been subjected to the forming treatment to be positioned at the contact portion is subjected to the soldering treatment by removing the insulating film of the lead wire in advance. Further, the height of the cut-and-raised pieces of the cut-and-raised pieces 24a, 25a of the relay terminal is set according to the diameter of the lead wire conductor used.

Further, during the forming process, the relay terminals which come into contact when the coil end lead wires 20a and 20b are bent toward the upper surface side of the rotating transformer core 5 along the cutout groove 5b and the lead wire guide cutout 28. Relay terminals Y-shaped portions 24c, 25c are provided at the end portions of 24, 25, and when lead wires 20a, 20b hit, they must be positioned at the center of the relay terminal which is the bottom of the Y-shape. become.
At the bottom of this Y-shape, a relay terminal Y with a diameter of the lead wire conductor that is approximately equal to
The lead-shaped wire 2 is provided with the notches 24d and 25d.
By pulling 0a, 20b toward the center of the rotating transformer core 5, the lead wires 20a,
20b is plastically deformed, and the lead wire 20 is first formed at the bottom of the Y-shape.
The relay terminals a and 20b come into contact with each other. Then,
With the lead wires 20a, 20b arranged in the center of the cut-and-raised pieces 24a, 25a of the relay terminal, the cut-and-raised pieces 24a,
As shown in FIG. 11, the caulking tool 25a is tilted down using the caulking tool 38, and caulking is performed so as to wrap the lead wires 20a and 20b. By this caulking, the lead wires 20a and 20b are cut into the Y-shaped portion 2 as shown in FIGS. 10 (a) and 10 (b).
4d and 25d, the cut and raised pieces 24a and 25a also make sure contact with the relay terminal, and further cut and raised pieces 24a and 25a.
By crimping 25a, the relay terminal side is also plastically deformed and contact with the lead wires 20a, 20b is surely made.

At this time, since the lead wire is a copper wire and the relay terminal is a phosphor bronze, the hardness of the copper wire is lower than that of the copper wire. It is accompanied by plastic deformation. Since the caulking is performed at the final end of the lead wire in this way, the disturbance factor applied to the final end of the lead wire is difficult to be transmitted to other adjacent contact parts, which are adjacent to each other. The initial state of is maintained and becomes stable. It should be noted that the method of crimping the cut and raised pieces so as to wrap the lead wire cannot be carried out smoothly for all the lead wires, and if the lead wire conductor diameter becomes smaller than 0.10 mm, any of the contact parts will be lost. Since problems such as wire breakage occur in this case, it is desirable to apply the above caulking method to a lead wire conductor having a diameter of 0.10 mm or more. Generally, a wire rod for a rotary transformer develops an adhesive force with a solvent or the like on the outermost periphery of the conductor,
Polyurethane insulation film copper wire with a self-welding layer that bonds between wires when wound as a coil is used,
A soldering process is carried out in which a desired portion of the coil end portion is melted by utilizing the heat of the molten solder while at the same time a solder alloy is attached to the outer peripheral portion of the conductor.

A phosphor bronze material is used for the relay terminals 24 and 25 having the elastic contacts 24b and 25b. However, since the surface is easily oxidized, nickel (N
i) A film of about 5 μm is plated, and a film of gold (Au) of about 0.1 μm is plated on the film to chemically stabilize the contact portion. The relay terminal may be plated with solder (Pb-Sn), silver (Ag), or the like, in addition to the above-mentioned plating. The cut-and-raised pieces 24a, 25a described above
Is the relay terminal 2 as shown in FIGS.
At predetermined positions on 4 and 25, pieces 24a, 2
5a, and the configuration in which the cut-and-raised piece is present becomes a hole, whereby the expanded shape of the relay terminal can be made small. When the cut-and-raised pieces 24a and 25a are raised from the inside of the material, the relay terminals 24 and 25 can be arranged close to each other, and when the insert molding used for forming the above-mentioned relay unit member is adopted. Is an effective means, and thus an effective means for realizing a small and small diameter rotary magnetic head device.

The cut-and-raised pieces 24a and 25a are the relay terminals 2
It is possible to reduce the distance between the terminals of the relay member by arranging the members to rise from the center side to both sides so as to cut apart a part of the component member at a predetermined position on Nos. 4 and 25. 16 is a relay unit member shown in FIG.
An example will be described with reference to a press-molded drawing of the relay terminal shown in FIG.
FIG. 16 (a) is a plan view showing a state in which the relay terminals 24, 25 are press-molded in an embodiment in which cut-raised pieces 24a, 25a are provided on the outer edge portions at predetermined positions on the relay terminals 24, 25. Indicates. FIG. 16 (b) shows that at predetermined positions on the relay terminals 24 and 25, parts are cut up and raised from the center to both sides so as to cut a part of the constituent members and cut and raised into pieces 24a and 25a. In the embodiment having a different configuration, the cut-and-raised pieces 24a, 2
5A is a plan view showing a state in which the relay terminals 24 and 25 are press-molded before cutting and raising 5a. FIG. The relay unit member 22 shown in FIG. 13 of the present invention is manufactured by insert molding, and the relay terminals 24 and 25 to be inserted are continuously press molded as shown in FIG.
The continuous relay terminals 24 and 25 are inserted into a mold, integrally molded with the insulating member 23, and the ends of the relay terminals are bent or cut into a predetermined shape to complete the process.

The cut and raised pieces 24a, 25 shown in FIG. 16 (b).
The part to be a is completed by rising to a predetermined shape after insert molding, and the part shown by the dotted line is the part to be cut and raised to become the pieces 24a and 25a. FIG.
As is clear from (a) and (b), the relay terminals 24, 2
The distance L between the five is L ₁ > L ₂ , and the inter-relay terminal distance L can be made smaller by cutting and raising the cut-and-raised pieces 24 a, 25 a shown in FIG. 16B from within the relay terminal member.
The original part of the relay terminal member, which is cut and raised to make a hole, has a square shape, and the ridgeline of the cut and raised piece is the diagonal line of the square, and cut along this diagonal line. Separate the raised piece. Therefore, the apex of the cut-and-raised piece becomes an acute angle mountain shape, and cutting the cut-and-raised piece along the diagonal line of the rectangle makes it possible to maximize the height of the peak of the cut-and-raised piece. Become. This makes it possible to widen the width of the cut-and-raised piece as a caulking member, and to increase the winding margin of the cut-and-raised piece with respect to the outer circumference of the lead wire conductor to be caulked.

FIG. 12 shows a forming state of the coil end lead wire in the electrical connection between the coil end and the relay member, which is performed by the rotating side rotary transformer shown in FIG. 4, and is an embodiment in which a capacitor is additionally connected. (A) is an enlarged plan view of a main part around the relay unit member, (b) is a sectional view taken along line AA,
(C) shows a side view. As will be described later, an embodiment of a relay unit member to which a capacitor can be added is shown in FIG.
3, shown in FIG. A mounting boss 27 is provided at a predetermined position on the RT tank 9, and the relay unit member 22 is
It is mounted by fitting a mounting hole 35 (see FIGS. 13 and 14) formed in the center of the relay unit member insulating member 23. After the relay unit member 22 is mounted, the tip of the mounting boss 27 is plastically deformed, so that the relay unit member 22 is fixed at a predetermined position on the RT tank 9. When it corresponds to the erasing head like the rotating side rotary transformer shown in FIG. 4, the capacitor mounting portion 3 between the terminals of the relay unit member 22 is used.
6 (see FIGS. 13 and 14), the capacitor 32 is attached by soldering, but this capacitor 32 does not affect the forming of the coil lead wire.

The coil end lead wires 20a and 20b pass through the lead lead-out groove 5a provided on the lower surface side of the rotating transformer core 5 and are led out to the upper surface side from the notch groove 5b in the outer peripheral portion, but the outer periphery of the RT tank 9 The position of the lead wire guide notch 28 provided in the portion coincides with the position of the notch groove 5b corresponding to each signal transmission coil 20. Therefore,
Connect the lead wires 20a and 20b to the lead wire notch 28
If the lead wires 20a and 20b are pulled linearly so as to hang over the rising groove 29 for lead forming, the lead wires 20a and 20b are centered between the Y-shaped portions 24c and 25c of the relay terminals 24 and 25 and the cut-and-raised pieces 24a and 25a. The lead wires 20a, 20b can be placed in the rising groove 29 in this state.
If the lead wires 20a and 20b are bent and plastically deformed, the forming state of the lead wires 20a and 20b can be maintained. After this,
As shown in FIG. 1, the cut-and-raised pieces 24a, 25a are tilted by a caulking tool 38 to wrap the lead wires 20a, 20b, and caulking is performed to complete the electrical connection.

13 and 14 show an RT according to the present invention.
Only the relay unit member 22 used for the tongue is shown in FIG.
(A) is a plan view of the relay unit member 22 in which the capacitor mounting portion 36 is on the back side and is referred to as “bending R direction”, (b)
14C is a side view, FIG. 14A is a plan view of the relay unit member 22 referred to as “bending L direction” with the capacitor mounting portion 36 on the front side, and FIG. 14B is a side view.
FIG. 13 and FIG.
The press-molded shape of the relay terminal shown in (b) is the same, but the bending direction is reversed at the cut-and-raised piece and the elastic contactor. With such a structure, only one type of external press molding die can be used, and the die cost can be reduced.

15A and 15B show a balancer 26 used for an RT tank according to the present invention. FIG. 15A is a plan view and FIG. 15B is a side view. In the balancer 26, the mounting holes 26a and 26b provided at both ends are fitted into the mounting boss 27 on the RT tank 9, and the tip of the mounting boss 27 is made plastic by the same manner as the fixing of the relay unit member 22 described above. Transform and R
It can be fixed at a desired position on the T-tanshi 9. The mounting position of the balancer 26 shown in FIGS. 2 and 4 is R
Positioning notch 33 provided on the outer peripheral portion of the T-tanch 9
However, if the intervals between the mounting holes 26a and 26b of the balancer 26 and the intervals between the mounting bosses 27 on the RT tank 9 (the same applies to the RT tank shown in FIG. 5) are made the same. , RT tank 9 can be fixed at a desired position. In the rotary drum, since the head base 7 for mounting the magnetic head 6 is the heaviest component, the mounting position of the balancer 26 is determined by a relative unbalanced positional relationship with the rotation axis of the head base 7. The weight is determined to be substantially the same as that of the head base 7, and the weight is determined in consideration of the specific gravity of the material, and due to the mounting means and the like, a rotary magnetic head device is used when the rotary transformer having the balancer 26 is used. The rotational motion balance of can be accurately obtained.

8 (b), 12 (b) and 13 (c)
As can be seen from the relay terminals 24, 2 according to the invention.
The cut-and-raised pieces 24a and 25a of No. 5 have a mountain shape whose apex has an acute angle. This means that when crimping, the width of the crimping member that rises on both sides in the direction perpendicular to the extension direction of the lead wire is evenly widest, and a pair of cut and raised parts wound around the outer periphery of the crimped lead wire conductor. Piece 24a,
The winding allowance of 25a can be evenly maximized, and the mechanical contact state can be stabilized in the limited space without increasing the distance between the terminals.

[0058]

According to the present invention, the coil end lead wire of the rotary transformer is electrically connected by caulking with the relay terminal, the performance is not deteriorated, the reliability is good, the work is easy, and the productivity of the assembling work is high. Therefore, it is possible to provide a high-performance rotary magnetic head device capable of easily performing automatic assembly work by a robot or the like, and easily balancing the rotational movement by using the assembled rotary transformer.

Further, in the electrical connection between the signal transmission coil of the rotary transformer and the conductive relay member, (1) the connection can be made without brazing such as soldering, so that the relay member can be attached to the insulating member. A material having no heat resistance can be selected, and an inexpensive material structure can be obtained. (2) Since the connection can be made without brazing such as soldering, the solder having a high specific gravity at the connection portion in the rotary drum is significantly reduced, and thus the rotational motion balance can be highly accurate. A high-performance rotary magnetic head device can be obtained. (3) The coil end lead wire of the rotary transformer is soldered and crimped by wrapping it with a relay member plated with gold, etc., to provide a mechanically and chemically stable contact area and to be reliable. A highly reliable electrical connection can be obtained.

(4) The conductor diameter is as thin as 0.10 mm for the connection without brazing such as soldering by crimping by plastic deformation of the relay member such that the coil end lead wire is wrapped with the relay member. Since it can handle even wire rods, the width of the coil groove of the rotary transformer can be narrowed, which is advantageous for increasing the number of channels, and the rotary magnetic head device can be downsized and have multiple functions. Also,
Since the width of the coil groove in the rotary transformer can be narrowed, the area of the core per channel is increased, and a high-performance rotary magnetic head device with a reduced transmission loss and an improved coupling coefficient can be obtained. (5) By performing crimping by plastic deformation of the relay member such that the coil end lead wire is wrapped with the relay member, the lower limit value of the conductor diameter is defined in the connection without brazing such as soldering, so that the coil Even if the conductor becomes thin, the reliability of the connection can be secured without using brazing such as soldering. (6) By crimping at the coil end so that the lead wire is wrapped in the relay member, the external force applied to the final end of the coil will not be transmitted to other adjacent contact points that are adjacent to each other, and the contact points will be displaced. Will not do. This makes it possible to maintain the initial state of other contact portions that are close to and continuous with each other, and electrical connection with high mechanical reliability can be obtained.

(7) By crimping the lead wire with the relay member using a cut-and-raised piece obtained by making a rectangular hole in the relay member, the relay member corresponding to one coil is brought into close proximity. They can be arranged, which is effective for downsizing the rotary magnetic head device. Also, by obtaining the cut and raised piece by cutting and raising it at a position along the diagonal line of the rectangle, it is possible to increase the winding allowance of the cut and raised piece around the lead wire conductor during crimping, and to improve mechanical strength. A reliable electrical connection is obtained. (8) By specifying the rotary transformer as a disc type (flat type), the relay member can be arranged on the plane in a well-balanced manner, and the coil end portion and the relay member are connected by being wrapped by the cut-and-raised pieces of the relay member. By doing so, the connection by caulking can be performed at a large number of places at the same time by an operation from one direction. This can reduce the number of steps in manufacturing the rotary transformer. (9) Even when the lead wire conductor diameter is thin and it is generally difficult to standardize the lead wire, it is important to consider the fact that the coil end lead wire can be treated linearly. Can be done accurately. Furthermore, by taking care that the coil end lead wire does not interfere with the elastic contact that is the other end of the relay terminal, the work of forming the lead wire accompanying the coil end connection can be simplified. Etc., which leads to automation, and further reduces the probability of deforming the elastic contact,
The reliability of the connecting portion with the magnetic head can be improved.

In addition, a relay unit member in which two relay terminals corresponding to a winding start and a winding end of one of the signal transmission coils forming the rotary transformer are integrated by an insulating member is formed into a disc-shaped insulating member. By adopting a configuration in which a plurality of concentric circles can be arranged on the RT tank which is (10), even for rotary magnetic head devices having different numbers of magnetic heads, a number of relays corresponding to the number of magnetic heads are relayed. Since it can be dealt with only by increasing or decreasing the number of unit members, new mold investment for constructing the relay unit member is not required. (11) When the relay unit members are concentrically arranged and mounted on the RT tank, they can be mounted by plastically deforming the mounting boss that is a part of the RT tank, so the movement of the center of gravity accompanying the mounting is extremely small. Therefore, it is possible to maintain a highly accurate rotational motion balance without disturbing a predetermined balance. This also makes it possible to obtain the same effect when attaching the balancer by utilizing the RT boss attachment boss. (12) Since the materials of the insulating member used for the relay unit member and the insulating member used for the RT tank base material can be selected separately, other members (capacitors) can be soldered to the relay terminals forming the relay unit member. When connecting the coil end lead wire by soldering or connecting the coil end lead wire by soldering, it is only necessary to use a heat resistant grade material only for the insulating member used for the relay unit member. Since the base material can be an inexpensive material with a low grade, the cost of the constituent members of the rotary magnetic head device can be kept low.

(13) Even if another member (capacitor) needs to be connected to the relay terminal by soldering or the like, if the other member is connected in advance and then attached to the RT tank, the caulking connection can be performed. Any deformation and change of connection due to heat can be eliminated. (14) When the rotary transformer and the magnetic head are connected by the elastic contactor and the capacitor is required to be connected, it is possible to connect the capacitor on the constituent members of the relay unit member that has the relay substrate. Since the base can be made small, it is advantageous in reducing the size and diameter of the rotary magnetic head device. (15) In manufacturing a rotary magnetic head device having a different number of magnetic heads, not only can the number of relay unit members corresponding to the number of magnetic heads be increased or decreased, but also unbalance with respect to the rotation axis. Even with an odd number of heads, the balancer can be attached using the attachment boss for the relay unit member, so a high-performance rotary magnetic head with balanced rotational motion by only supporting the rotary rotary transformer. The device can be manufactured.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a rotary magnetic head device according to the present invention.

FIG. 2 (a) is a plan view of a rotary side rotary transformer having a 5-channel configuration of a rotary magnetic head device according to the present invention;
(B) is an AA sectional view and (c) is a bottom view.

FIG. 3A is a plan view of a fixed-side rotary transformer having a 5-channel structure of a rotary magnetic head device according to the present invention;
(B) is an AA sectional view and (c) is a bottom view.

FIG. 4A is a plan view of a rotary rotary transformer having a three-channel configuration of a rotary magnetic head device according to the present invention;
(B) is an AA sectional view and (c) is a bottom view.

FIG. 5 (a) is a plan view of an RT tank for arranging a relay unit member used in a rotating rotary transformer according to the present invention;
(B) is a cross-sectional view taken along line AO-A, and (c) is a bottom view.

FIG. 6 is an X-X cross-sectional view of the plan view shown in FIG. 5A of the RT tank for arranging the relay unit member used in the rotation side rotary transformer according to the present invention.

FIG. 7 is a schematic diagram of an RT tank of another embodiment in which the relay unit member used in the rotary rotary transformer according to the present invention is not arranged;
(A) is a plan view, (b) is an AOA sectional view, and (c) is a bottom view.

FIG. 8 is a schematic diagram of an RT tank of another embodiment in which the relay unit member used in the rotary rotary transformer according to the present invention is not arranged;
FIG. 7A is an enlarged view of a portion P of the plan view shown in FIG.
Is a cross-sectional view taken along line X-X of the enlarged P portion, and (c) is Y of the enlarged P portion.
-Y sectional drawing, (d) is ZZ sectional drawing of a P section enlarged view.

9A and 9B are explanatory diagrams of forming around the relay unit member in the rotating side rotary transformer according to the present invention. FIG. 9A is an enlarged plan view of an essential part before forming is completed and before caulking.
Is a side view.

FIG. 10 is an explanatory view of forming around the relay unit member in the rotating side rotary transformer according to the present invention, (a) is an enlarged plan view of an essential part after forming is completed and caulking is performed;
(B) is a side view.

FIG. 11 is an explanatory view of forming around the relay unit member in the rotating-side rotary transformer according to the present invention, and is a change diagram of the cut-and-raised pieces before and after caulking after forming is completed.

12A and 12B are explanatory views of forming around the relay unit member in the rotating side rotary transformer according to the present invention, in which (a) is an enlarged plan view of an essential part, particularly when a capacitor is added;
Is a cross-sectional view taken along line AA, and (c) is a side view.

FIG. 13A is a plan view, and FIGS. 13B and 13C are side views of a relay unit member constituting an RT tank according to the present invention.

FIG. 14 is another embodiment of the relay unit member constituting the RT tank according to the present invention, (a) is a plan view and (b) is a side view.

15A and 15B show a balancer used in the RT tank according to the present invention, FIG. 15A is a plan view, and FIG. 15B is a side view.

16A and 16B show a relay terminal used in a relay unit member according to the present invention, FIG. 16A is a plan view in which a cut and raised piece is provided on the outer periphery of the member, and FIG. 16B is a plan view showing the cut and raised piece provided inside the member. FIG.

FIG. 17 is a connection explanatory view of a coil end portion and a connection terminal member according to a conventional technique.

FIG. 18 is a connection explanatory view of the elastic contactor and the coil end portion according to the related art.

FIG. 19 is an explanatory diagram of a rotor of a rotary transformer using a pressure contact type contactor according to a conventional technique.

FIG. 20 is a connection explanatory diagram of a signal transmission coil of a rotary transformer using a slit-shaped relay according to a conventional technique.

FIG. 21 is an explanatory diagram of an erasing magnetic head in which a resonance capacitor is arranged on a relay member of a head winding according to a conventional technique.

FIG. 22 is a balance adjustment explanatory diagram in which solder is placed on a relay member printed circuit board provided in a rotating portion in order to adjust the rotational movement balance inherent in the rotating body according to the related art.

[Explanation of symbols]

1 ... Fixed drum, 2 ... Rotating drum, 3 ... Shaft, 4 ...
Fixed-side transformer core, 5 ... Rotating-side transformer core, 5a ...
Lead wire drawing groove, 5b ... Notch groove, 6 ... Magnetic head,
7 ... Head base, 8 ... Relay board, 9 ... RT tank,
9 '... Disk-shaped insulating member, 12 ... Flexible insulating substrate, 13 ...
Motor member (rotor), 14 ... Motor member (stator), 15 ... Motor member (signal board), 16 ... Bearing, 20 ... Signal transmission coil (rotation side), 20a,
20b ... Coil end lead wire, 21 ... Short ring (rotating side), 22 ... Relay unit member, 23 ... Insulating member for relay unit member, 24, 25 ... Relay terminal, 24a, 25a ... Cut and raised piece, 24b, 25b … Elastic contacts, 24c, 25c…
Y-shaped portion, 24d, 25d ... Relay terminal Y-shaped portion cutout,
24e, 25e ... Fixing rib, 26 ... Balancer, 27
… Mounting boss, 28… Lead wire guide notch, 29…
Lead forming riser groove, 30 ... Signal transmission coil (fixed side), 30a, 30b ... Coil end lead wire, 3
1 ... Short ring (fixed side), 32 ... Capacitor, 3
3 ... Positioning notch, 35 ... Mounting hole, 36 ... Capacitor mounting part, 38 ... Caulking tool, 40 ... Rotating side transformer element, 41 ... Connection terminal member, 42 ... Connector member, 43 ... Magnetic head, 44 ... Rotor, 45 ... Elastic contactor, 46 ... Terminal plate, 47 ... Head base, 48 ... Connection pattern, 49 ... Terminal, 50 ... Rotating transformer rotor section,
51 ... Pressure contact type contactor, 52 ... Coil wire, 53 ... V-shaped groove, 54 ... Lead end of signal transmission coil, 55 ...
Slit-shaped conductive relay element, 56 ... Slit portion, 57 ... Head winding, 58 ... Terminal plate, 59 ... Copper foil pattern, 60 ...
Condenser, 61 ... Flywheel, 62 ... Rotating part, 6
3 ... Printed circuit board, 64 ... Print pattern, 65 ... Solder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Zama 1410 Inada, Hitachinaka City, Ibaraki Pref., Hitachi, Ltd. Personal Media Equipment Division

Claims (13)

[Claims] 1. A rotary drum equipped with a magnetic head and having a rotary transformer composed of a rotary transformer core and a signal transmission coil, and a fixed transformer core and a signal so as to face the rotary drum transformer. A rotary magnetic head device, comprising: a fixed drum having a fixed rotary transformer formed of a transmission coil; and a signal exchange with the magnetic head via the rotary transformer. , A RT-tank made of a disk-shaped insulating member having a conductive relay member is fixed, and the coil end lead wire of the signal transmission coil embedded in the groove of the rotating-side transformer core is fixed to a predetermined portion of the conductive relay member. , And the coil end lead wire and the conductive relay member are plastically deformed at the contact portion to make an electrical connection by contact at a plurality of locations. Rotary magnetic head apparatus characterized by having made a rotation-side rotary transformer. 2. The conductor according to claim 1, wherein the insulation coating is removed from the coil end lead wire at the contact portion between the coil end lead wire of the signal transmission coil and the conductive relay member, and the solder alloy is formed on the conductor surface. A rotary magnetic head device characterized by being welded. 3. The metal film according to claim 1, wherein the conductive relay member at a contact portion between the coil end lead wire of the signal transmission coil and the conductive relay member is different from the metal of the conductive relay member. A rotary magnetic head device, characterized in that the surface is provided with. 4. The conductive relay member according to claim 1, wherein a cut-and-raised piece for connecting the coil end lead wire of the signal transmission coil by caulking to a predetermined portion of the conductive relay member. A rotary magnetic head device characterized by having. 5. The conductive relay member according to claim 1 or 4, wherein the conductive relay member has a cut-and-raised piece that is erected so as to make a hole at a predetermined portion of the conductive relay member. A rotary magnetic head device characterized by the above. 6. The conductive relay member according to claim 1 or 5, wherein the conductive relay member is cut along a diagonal line of the square so as to form a square hole at a predetermined portion of the conductive relay member from the center side. A rotary magnetic head device having cut-and-raised pieces raised on both sides. 7. The rotating-side rotary transformer according to claim 1 or 4, wherein one end of the rotating-side rotary transformer is attached to the RT-side transformer on the rotating-side transformer core by caulking a coil end lead wire. A conductive relay member having a cut-and-raised piece for connection, and the other end having an elastic contact for elastically connecting to the relay substrate for connecting the magnetic head, wherein the coil-end lead wire is from the outer peripheral portion of the rotating-side transformer core. It is bent in a substantially central direction, the position of the cut-and-raised piece of the conductive relay member is on an extension line of the coil end lead wire of the rotating-side transformer core in the bending direction, and the coil end lead wire is Within the range from the outer peripheral portion of the side transformer core to the center of the rotating side transformer core, the elastic contacts of the conductive relay member are all positioned. Rotary magnetic head device, characterized in that is obtained by the so not on bending direction of extension of the coil end leads. 8. The rotating-side rotary transformer according to claim 1, wherein two conductive relay members for connecting to a coil end lead wire corresponding to one signal transmission coil are integrated by an insulating member. A rotary magnetic head device, characterized in that a plurality of relay unit members formed into a disc-shaped insulating member are arranged on the same circumference and an RT tank is fixed on a rotating-side transformer core. 9. The rotating-side rotary transformer according to claim 1, wherein the rotating-side rotary transformer is arranged in an RT tank on a rotating-side transformer core attached to the rotating-side rotary transformer. At least one of the relay unit members integrated by an insulating member
A rotary magnetic head device comprising a capacitor connected between two conductive relay members. 10. The rotating-side rotary transformer according to claim 1 or 8, wherein the rotating-side rotary transformer has a disk-shaped insulating member of the RT-tans on the rotating-side transformer core, and the RT-tanch on the rotating-tank. The two conductive relay members arranged on the same circumference are configured by a relay unit member integrated with an insulating member by an insulating member made of a different material. A rotary magnetic head device, wherein the insulating member of the unit member has higher heat resistance than the disk-shaped insulating member. 11. The rotating-side rotary transformer according to claim 1, wherein the rotating-side rotary transformer has the same circle on a disk-shaped insulating member that constitutes an RT tank on the rotating-side transformer core attached to the rotating-side rotary transformer. A plurality of mounting bosses are arranged on the circumference, a relay unit member in which two conductive relay members are integrated by an insulating member is fitted, and a part of the mounting boss is plastically deformed to form the relay unit member. A rotary magnetic head device characterized by being fixed. 12. The rotating-side rotary transformer according to claim 1, wherein a signal transmission coil is embedded in a groove of a mounted rotating-side transformer core, and the conductor diameter of a coil wire of the coil is 0. A rotary magnetic head device having a size of 1 mm or more. 13. The RT according to claim 1 or 11, wherein the rotary drum is fixed on a rotary transformer core of a rotary rotary transformer mounted on the rotary drum.
A plurality of mounting bosses are arranged on the same circumference on the disk-shaped insulating member that constitutes the tank, and a required relay unit member is provided,
In order to correct the rotational motion balance of the rotary drum, a balancer is fitted into a required mounting boss on the RT tank and a part of the mounting boss is plastically deformed to fix the balancer. Characteristic rotary magnetic head device.