JP3407440B2 - Magnetic head using thin film coil - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head using a thin film coil.

[0002]

2. Description of the Related Art A conventional magnetic head using a thin film coil will be described with reference to FIG. This magnetic head is
It is called a short magnetic path magnetic head and is used as a rotary magnetic head for recording, reproducing or recording / reproducing of a video recording / reproducing device, an audio recording / reproducing device, a video / audio recording / reproducing device, a data recording / reproducing device and the like.

Reference numeral 5 indicates a magnetic head, that is, a head chip as a whole. Reference numeral 1 denotes an insulating block made of an insulating material such as glass, which is a rectangular parallelepiped joined by using an adhesive or the like, and is composed of upper and lower substrates 2B and 2A having different shapes and sizes.

Spiral-shaped thin film coils are formed by printing on the flat surface 2a of the lower substrate 2A and on the flat surface of the upper substrate 2B that is in contact with the flat surface 2a. The flat surface is glued onto the flat surface 2a of the lower substrate 2A, and thus the thin film coil is not visible in this FIG. When the flat surface 2a of the lower substrate 2A and the flat surface of the upper substrate 2B are joined, the spiral thin film coils on the flat surface 2a of the lower substrate 2A and the flat surface of the upper substrate 2B Terminals 4'wherein the ends on the center side are electrically connected to each other, and the ends on the outer peripheral side of the thin film coil on the plane of the upper substrate 2B are formed on the plane 2a of the lower substrate 2A. The terminal 4 is led out from the end portion on the outer peripheral side of the thin film coil on the flat surface 2a of the lower substrate 2A. These terminals 4, 4'are formed by printing on the flat surface 2a of the lower substrate 2A.

Then, the other ends of the lead wires 6, 6 each having one end connected to both ends of a part of a coil of a rotary transformer (not shown) are electrically connected to the terminals 4, 4'by a solder 8. It is mechanically connected. Of the plane 2a of the lower substrate 2A, the terminals 4, 4'and the lead wires 6, 6 connected to these are exposed to the outside without being covered by the upper substrate 2B.

In such a magnetic head, one lead wire 6-terminal 4-the outer peripheral side end of the thin film coil on the plane of the lower substrate 2A-the center side end of the thin film coil-the upper substrate 2B. Of the thin film coil on the plane, the end portion on the outer peripheral side of the thin film coil, the terminal 4 ', and the other lead wire 6 are formed.

In the upper and lower substrates 2A and 2B, magnetic cores M1 and M2 are buried so as to sandwich the above-mentioned thin film coils, and one ends of the magnetic cores 3M1 and M2 are arranged close to each other, and the substrate 1 and A gap G is formed between the two side faces of the magnetic core 3 so as to face the outside, and the other ends of the magnetic cores 3M1 and M2 are arranged close to each other to form a back gap.

The head chip 5 is mounted on the head substrate of the rotary drum of the tape guide drum device such as the video recording / reproducing device, the audio recording / reproducing device, the video / audio recording / reproducing device, and the data recording / reproducing device described above.

FIG. 7 shows another conventional magnetic head (head chip) using a thin film coil, and instead of the lead wires 6 and 6 in the conventional example of FIG. 4, a flexible printed wiring board having two conductor wires. The two wires of 7 are terminals 4,
4 ', the other structure is the same as the conventional example of FIG.

Since the coil of the short magnetic path magnetic head shown in FIGS. 6 and 7 is formed of a thin film, the cross-sectional area of the coil can be made small and the space occupied by the coil can be made small. It has the feature that the length of the magnetic path formed is shortened. In the thin film head, the magnetic core is formed of a thin film so as to substantially surround a part of the coil. In the short magnetic path magnetic head, however, the magnetic core is constructed by joining the core halves. ing.

[0011]

In the conventional magnetic head shown in FIGS. 4 and 5, the connecting portions of the lead wires 6 and 6 or the terminals 4 and 4'of the flexible printed wiring board 7 are exposed to the outside. When the lead wires 6, 6 or the flexible printed wiring board 7 is pulled relatively to the insulating block 1, the angle range of the pulling direction with respect to the surfaces of the terminals 4, 4'is 0 ° to 90 °. The lead wires 6, 6 or the flexible printed wiring board 7 separate from the terminals 4, 4'even with a small pulling force as the angle of the pulling direction with respect to the surface of the terminals 4, 4 'approaches 90 °. On the contrary, as the angle becomes closer to 0 °, the lead wires 6 and 6 or the flexible printed wiring board 7 are hard to separate from the terminals 4 and 4 'unless the pulling force is large.

In view of the above point, the present invention provides a thin-film coil formed on a predetermined surface in the insulating block, a terminal led out from the end of the thin-film coil, and the thin-film coil inside the insulating block so as to sandwich the thin-film coil. In a magnetic head using a thin film coil having a pair of magnetic cores provided and a gap formed on the side surface of an insulating block by the pair of magnetic cores, a connecting conductor electrically and mechanically connected to a terminal is provided. However, even if it is pulled relatively to the insulating block, it is intended to propose one that is hard to be separated from the terminal.

[0013]

A first aspect of the present invention is a thin film coil 3 formed on a predetermined surface 2a in an insulating block 1.
And terminals 4 and 4 derived from the end of the thin film coil 3.
And a thin film having a pair of magnetic cores M1 and M2 provided in the insulating block 1 so as to sandwich the thin film coil 3 and a gap G formed on the side surface of the insulating block 1 by the pair of magnetic cores M1 and M2. In the magnetic head using the coil 3, a part of the insulating block 1 is provided with a groove 9 having one surface 9a continuous with the predetermined surface 2a and another surface 9b opposite to the one surface 9a. A magnetic head using a thin-film coil, characterized in that the terminals 4 and 4 are provided on one surface 9a and the size of the groove 9 is set so that the connecting conductors 6 and 6 can be connected to the terminals 4 and 4. Is.

The second aspect of the present invention is the same as the first aspect of the present invention.
The insulating block 1 is a pair of insulating substrates 2 bonded to each other.
It is composed of A and 2B, and the predetermined surface is a pair of insulating substrates 2
A pair of magnetic cores M1 and M2 are embedded in a pair of insulating substrates 2A and 2B, respectively, and a groove 9 is a pair of insulating substrates 2
A magnetic head using a thin-film coil characterized by being formed between A and 2B.

The third aspect of the present invention is the same as the first or second aspect of the present invention, in which a predetermined surface in the insulating block 1 is close to each other in which thin film coils 3a and 3b each having one end connected to each other are formed. The two surfaces 2a and 2b are formed on the one surface 9a and the other surface 9b of the groove 9, and the terminals 4a and 4b are respectively derived from the other ends of the thin film coils 3 formed on the two surfaces 2a and 2b. And a magnetic head using a thin-film coil.

[0016]

According to the first aspect of the present invention, the insulating block 1
A groove 9 having one surface 9a continuous with the predetermined surface 2a and the other surface 9b opposite to the one surface 9a is provided in a part of the above, and the terminals 4 and 4 are provided on the one surface 9a of the groove 9. Since the size of the groove 9 is set so that the connecting conductors 6 and 6 can be connected to the terminals 4 and 4, the connecting conductors 6 and 6 connected to the terminals 4 and 4 are relatively arranged with respect to the insulating block 1. When pulled, even if the angle of the pulling direction with respect to the surface of the terminals 4, 4 is changed in the range of 0 ° to 90 °, the movement of the connecting conductors 6, 6 is restricted by the edges of the groove 9, The angle in which the connecting conductors 6, 6 are pulled in the groove 9 with respect to the surface of the terminals 4, 4 is less than or equal to a predetermined angle close to 0 °. Four
Will not leave. Further, in this way, the angle of the connecting conductors 6, 6 in the direction of pulling in the groove 9 with respect to the surface of the terminals 4, 4 is less than or equal to a predetermined angle close to 0 °, so that the connecting conductors 6, 6 are 4, it is only necessary to take measures (for example, to make the connection area between the connection conductors 6 and 6 and the terminals 4 and 4 as large as possible) so as not to be separated from the connection conductors 4. Therefore, it is easy to take measures.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic head according to an embodiment of the present invention will be described below with reference to FIG. 1 together with its assembling method. This magnetic head is called a short magnetic path magnetic head, and is a video recording / reproducing device, an audio recording / reproducing device, a video / audio recording / reproducing device,
It is used as a rotary magnetic head for recording, reproducing, or recording / reproducing of a data recording / reproducing apparatus or the like. Reference numeral 5 indicates a head chip (magnetic head) as a whole. Reference numeral 1 is a block made of an insulating material such as glass, and upper and lower insulating substrates 2B and 2B having different shapes and sizes which are joined together by using an adhesive or the like.
Composed of A.

As shown in FIG. 1A, a spiral thin film coil 3 is formed by printing on a plane 2a of a lower substrate 2A having a rectangular parallelepiped shape, and terminals 4 led out from both ends of the thin film coil 3 are formed. Similarly, 4 is formed on the flat surface 2a. In the drawing of the upper substrate 2B, a step portion is formed on the lower surface side to divide into a thick portion and a thin portion, and the thick portion covers the thin film coil 3 as shown in FIG. 1B. It is bonded to the flat surface 2a of the substrate 2A with an adhesive (FIG. 1B). Thus, a groove 9 having a substantially rectangular parallelepiped cross section is formed between the lower surface (flat surface) 9b of the thin portion of the upper substrate 2B and a surface substantially perpendicular thereto and the flat surface 2a (9a) of the lower substrate 2A. It is formed.

In the upper and lower substrates 2A and 2B, magnetic cores M1 and M2 are embedded so as to sandwich the thin film coil 3, and one ends of the magnetic cores M1 and M2 are arranged in close proximity to each other so that the substrates 1 and 2 can be connected. The gap G is formed so as to face the outside on a common side surface, and the other ends of the gap G are arranged in proximity to form a back gap.

Then, as shown in FIG. 1C, solder is attached to each one end of the lead wires 6, 6 whose ends are connected to both ends of a part of a coil of a rotary transformer (not shown). 9a
The upper ends of the leads 4 and 4 are brought into contact with each other, a half-trowel is inserted into the groove 9 and the part is heated to electrically and mechanically connect each end of the lead wires 6 and 6 to the terminals 4 and 4. To do.

The head chip 5 is mounted on the head substrate of the rotary drum of the tape guide drum device.

According to the embodiment shown in FIG. 1, the terminals 4, 4 are
When the lead wires 6 connected to the insulating block 1 are pulled relative to the insulating block 1, even if the angle of the pulling direction with respect to the surface of the terminals 4 is changed in the range of 0 ° to 90 °, Since the movement of the wires 6 and 6 is restricted by the edges of the groove 9, the angle of the lead wires 6 and 6 in the groove 9 in the pulling direction with respect to the surface of the terminals 4 and 4 is less than a predetermined angle close to 0 °. Therefore, the lead wires 6, 6 cannot be separated from the terminals 4, 4 unless the pulling force is large. Further, in this way, the angle of the lead wires 6, 6 in the groove 9 with respect to the surface of the terminals 4, 4 in the pulling direction is less than or equal to the predetermined angle close to 0 °. 4, it is only necessary to take measures to prevent the wires from being separated from each other (for example, to make the connection area between the lead wires 6 and 6 and the terminals 4 and 4 as wide as possible), and therefore it is easy to take measures.

FIG. 2 shows another embodiment of the head chip 5
Is the same as that of FIG. 1B. Then, solder is attached to the other end of each of the two conductive layers of the flexible printed wiring board 7 in which one end of each of the two conductive layers is connected to both ends of a part of the coil of the rotary transformer, and a plane of the groove 9 is formed. Terminals 4 and 4 on 9a
The flexible printed wiring board 7 is brought into contact with the terminals 4, the soldering iron is inserted into the groove 9 and the portion is heated,
4 electrically and mechanically.

Next, referring to FIG. 3, a magnetic head of still another embodiment will be described together with its assembling method. Reference numeral 5 indicates the head chip as a whole. Reference numeral 1 is a block made of an insulating material such as glass, and is composed of upper and lower plane-symmetrical substrates 2B and 2A joined by an adhesive or the like.

As shown in FIG. 3A, the lower and upper substrates 2
Spiral-shaped thin-film coils 3a and 3b are formed by printing on flat surfaces 2a and 2b facing each other of A and 2B, respectively, and tapered surfaces 9a whose intervals increase toward the outer sides continuous with the flat surfaces 2a and 2b. Terminals 4a and 4b led out from one end on the outer peripheral side of each of the thin film coils 3a and 3b are formed by printing on 9b (constituting the groove 9).

Then, the pressure-applied portions of the lower and upper substrates 2A, 2B are abutted against each other and joined by an adhesive as shown in FIG. 3B, but the flat surfaces 2a of the substrates 2A, 2B facing each other,
The coils 3a and 3b formed on the substrate 2b are covered with an insulating layer except for the ends on the center side, and the substrate 2A,
When 2B is joined, each thin film coil 3a, 3b is electrically and mechanically connected at its center end. A groove 9 having a triangular cross section is formed from the tapered surfaces 9a and 9b facing each other.

Then, as shown in FIG. 3C, one end is connected to both ends of a part of the coil of the rotary transformer.
Flexible printed wiring board 7 provided with a conductive layer of a book
Solder is attached to the other end of each of the conductive layers a and 7b,
The flexible printed wiring boards 7a and 7b are connected to the terminals 4a and 4b on the tapered surfaces 9a and 9b of A and 2B respectively, the soldering irons are inserted into the grooves 9, and the portions are heated to connect the flexible printed wiring boards 7a and 7b to the terminals. Electrically and mechanically connected to 4a and 4b.

In the upper and lower substrates 2A and 2B, magnetic cores M1 and M2 are embedded so that the thin film coil 3 is sandwiched between them. A gap G is formed on the common side surface so as to face the outside, and the other ends of the gaps G are arranged in proximity to form a back gap.

Next, referring to FIG. 4, a magnetic head of still another embodiment will be described together with its assembling method.
Since the steps A, B and C are substantially the same as the steps A, B and C of FIG.

Similar to the magnetic head of FIG. 3, the magnetic head of FIG. 4 has thin film coils 3a and 3b formed on the plane 2a of the lower substrate 2A and the plane 2b of the upper substrate 2B, respectively. Although the same applies to the magnetic head shown in FIG. 3, terminals 4 and 4 respectively derived from the outer peripheral sides of the thin film coils 3a and 3b are the same on both substrates 2A and 2A.
It is formed on one side of B, for example, the plane 2a of the lower substrate 2A. Further, unlike the magnetic head of FIG. 3, a step is formed in the portion of the upper substrate 2B opposite to the portion of the lower substrate 2A where the terminals 4 and 4'are formed. The point is that the groove 9 similar to that of the example is formed.

The thin-film coil 3a has its outer peripheral end extended and connected to the terminal 4, whereas the thin-film coil 3b has
The alternation end of the thin film coil 3b is formed on the flat surface 2a of the lower substrate 2A so as to be connected to the terminal 4 ', and when the flat surfaces 2a and 2b of both substrates 2A and 2B are joined, The outer peripheral end of the coil 3b is the flat surface 2a of the lower substrate 2A.
The thin film coil 3b formed above is electrically connected to the alternation end.

The terminals 4 and 4'formed on the flat surface 2a of the lower substrate 2A are respectively connected to lead wires 6 and 6 each having one end connected to both ends of a coil of a rotary transformer. Solder is attached to the other end, a soldering iron is inserted into the groove 9, and is brought into contact with the terminals 4, 4'on one surface 9a of the groove 9 (surface on the lower substrate 2A side), By heating that portion, the ends of the lead wires 6,6 are electrically and mechanically connected to the terminals 4,4 '.

In such a magnetic head, one lead wire 6
-Terminal 4-End of the thin film coil 3a on the plane of the lower substrate 2A on the outer peripheral side-End of the thin film coil 3a on the center side-End of the thin film coil 3b on the plane of the upper substrate 2B on the center side A series circuit of a part-the end of the thin-film coil 3b on the outer peripheral side-the terminal 4'-the other lead wire 6 is formed.

FIG. 5 shows still another embodiment, and the structure of the head chip 5 is the same as that of the embodiment of FIG. Then, solder is attached to the other end of the conductive layer of the flexible printed wiring board 7 having one conductive layer, one end of which is connected to both ends of some coils of the rotary transformer, and the solder is inserted into the groove 9. By inserting a trowel into contact with the terminals 4 and 4'on one surface 9a of the groove 9 (the surface on the lower substrate 2A side) and heating that portion, the flexible printed wiring board 7 This is the case where the other end of the conductive layer is electrically and mechanically connected to the terminals 4, 4 '.

In each of the above-described embodiments, the case where the lead wires 6, 6 or the flexible printed wiring boards 7, 7a, 7b are soldered to the terminals 4, 4 or 4a, 4b has been described. And the flexible printed wiring boards 7, 7a, 7b having terminals 4 and 4a having a structure capable of being press-fitted.
You may make it press-fit into 4b.

After the above-mentioned assembly, the head chip 5 of each of the above-described embodiments is subjected to sliding surface formation and contact width processing chip cutting on the side surface of the insulating block 1 where the gap G is formed with respect to the magnetic tape.

According to the first embodiment, the thin-film coil 3 formed on the predetermined surface 2a in the insulating block 1, the terminals 4 and 4 led out from the end of the thin-film coil 3, and the thin-film coil 3 are formed. And a pair of magnetic cores M1 and M2 provided in the insulating block 1 so as to sandwich
In the magnetic head using the thin-film coil 3 having the gap G formed on the side surface of the insulating block 1 by 2, a part of the insulating block 1 has one surface 9a continuous with the predetermined surface 2a and one surface 9a thereof. The groove 9 having the other surface 9b facing the groove 9 is provided, the terminals 4 and 4 are provided on the one surface 9a of the groove 9, and the terminals 4 and 4 are provided with a connection conductor (lead wire, flexible printed wiring board, etc.) 6 Since the size of the groove 9 is set so that the terminals 6 and 6 can be connected, when the connection conductors 6 and 6 connected to the terminals 4 and 4 are pulled relatively to the insulating block 1, the terminals in the pulling direction Even if the angle with respect to the planes 4 and 4 is changed in the range of 0 ° to 90 °, the movement of the connecting conductors 6, 6 is restricted by the edge portion of the groove 9, so that the connecting conductors 6, 6 in the groove 9 are not moved. Terminal 4 in the pulling direction,
Since the angle with respect to the surface of 4 is a predetermined angle close to 0 ° or less, the connecting conductors 6, 6 do not separate from the terminals 4, 4 unless a large pulling force is applied. Further, in this way, the angle of the connecting conductors 6, 6 in the direction of pulling in the groove 9 with respect to the surface of the terminals 4, 4 is less than or equal to a predetermined angle close to 0 °, so that the connecting conductors 6, 6 are 4, it is only necessary to take measures (for example, to make the connection area between the connection conductors 6 and 6 and the terminals 4 and 4 as large as possible) so as not to be separated from the connection conductors 4. Therefore, it is easy to take measures.

According to the second embodiment, in the first embodiment, the insulating block 1 is composed of a pair of insulating substrates 2A and 2B joined to each other, and a predetermined surface of the pair of insulating substrates 2A and 2B. The pair of magnetic cores M1 and M2, which are either of the surfaces 2a and 2b facing each other, are embedded in the pair of insulating substrates 2A and 2B, respectively, and the groove 9 is the pair of insulating substrates 2A and 2B.
Since it is formed between A and 2B, in addition to the effect of the first embodiment, manufacturing and assembling of such a magnetic head becomes easy.

According to the third embodiment, in the first or second embodiment, thin film coils 3a and 3b each having one end connected to each other are formed on a predetermined surface in the insulating block 1. It is composed of two surfaces 2a and 2b which are close to each other, and one surface 9a of the groove 9 and the other surface 9b have two surfaces 2a,
In addition to the effect of the first or second embodiment, the thin film coil in the insulating block 1 is provided with the terminals 4a and 4b respectively led out from the other ends of the thin film coils 3 formed in 2b. Terminal 4 derived from 3a and 3b
The area required for forming a and 4b is small, and the number of magnetic heads formed in one large insulating block can be increased.

[0040]

According to the first aspect of the present invention described above, the thin-film coil formed on a predetermined surface in the insulating block, the terminal led out from the end of the thin-film coil, and the thin-film coil are sandwiched. In a magnetic head using a thin film coil having a pair of magnetic cores provided in an insulating block and a gap formed on the side surface of the insulating block by the pair of magnetic cores, a predetermined surface is provided on a part of the insulating block. A groove having one continuous surface and the other surface facing the one surface is provided, a terminal is provided on the one surface of the groove, and the size of the groove is set so that the connection conductor can be connected to the terminal. Because I did
When the connecting conductor connected to the terminal is pulled relative to the insulating block, the movement of the connecting conductor will not change even if the angle of the pulling direction with respect to the surface of the terminal is changed in the range of 0 ° to 90 °. Since it is limited by the edge, the angle of the connection conductor in the groove in the direction of pulling with respect to the surface of the terminal is less than or equal to a predetermined angle close to 0 °, so the connection conductor does not separate from the terminal unless a large pulling force is applied. . Further, as described above, since the angle of the connection conductor in the groove in the pulling direction with respect to the surface of the terminal is less than or equal to a predetermined angle close to 0 °, a measure for preventing the connection conductor from separating from the terminal (for example, connection The connection area between the conductor and the terminal should be as wide as possible), so that it is easy to take measures.

According to the second aspect of the present invention described above, in the first aspect of the present invention, the insulating block is composed of a pair of insulating substrates bonded to each other, and the predetermined surface is a surface of the pair of insulating substrates facing each other. In either case, since the pair of magnetic cores are embedded in the pair of insulating substrates and the groove is formed between the pair of insulating substrates, in addition to the effect of the first invention,
The manufacture and assembly of such a magnetic head is facilitated.

According to the third aspect of the present invention described above, in the first or second aspect of the present invention, the predetermined surface in the insulating block is
It is composed of two surfaces adjacent to each other on which thin film coils each having one end connected to each other are formed, and one surface and the other surface of the groove are respectively formed from the other ends of the thin film coils respectively formed on the two surfaces. Since the lead-out terminal is provided, in addition to the effect of the first or second aspect of the present invention, the area necessary for forming the lead-out terminal from the thin-film coil in the insulating block is small and one large The number of magnetic heads formed on the insulating block can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing an assembly process of an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is a perspective view showing an assembly process of still another embodiment of the present invention.

FIG. 4 is a perspective view showing an assembly process according to still another embodiment of the present invention.

FIG. 5 is a perspective view showing still another embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional example.

FIG. 7 is a perspective view showing a conventional example.

[Explanation of symbols]

1 insulating block 2A substrate 2B substrate 2a side 2b side 3 coils 3a coil 3b coil 4 terminals 4'terminal 4a terminal 4b terminal 5 head chips 6 lead wire 7 Flexible printed wiring board 7a Flexible printed wiring board 7b Flexible printed wiring board 8 solder M1 magnetic core M2 magnetic core 9 grooves 9a side 9b side

Claims (3)

(57) [Claims] 1. A thin film coil formed on a predetermined surface in an insulating block, a terminal led out from an end of the thin film coil, and a pair of thin film coils provided in the insulating block so as to sandwich the thin film coil. In a magnetic head using a thin-film coil having a magnetic core and a gap formed on the side surface of the insulating block by the pair of magnetic cores, a part of the insulating block has one surface continuous with the predetermined surface and A groove having another surface facing the one surface is provided, the terminal is provided on the one surface of the groove, and the size of the groove is set so that a connecting conductor can be connected to the terminal. A magnetic head using a thin film coil. 2. The magnetic head using the thin film coil according to claim 1, wherein the insulating block is composed of a pair of insulating substrates bonded to each other, and the predetermined surface is opposed to each other of the pair of insulating substrates. A magnetic head using a thin film coil, wherein the pair of magnetic cores are embedded in the pair of insulating substrates, and the groove is formed between the pair of insulating substrates. . 3. A magnetic head using the thin film coil according to claim 1 or 2, wherein predetermined surfaces in the insulating block are close to each other and thin film coils each having one end thereof connected to each other are formed. A thin film, which is composed of two surfaces and is provided with terminals led out from the other ends of the thin film coils respectively formed on the two surfaces on one surface and the other surface of the groove. A magnetic head that uses a coil.