JP2995864B2 - Multilayer chip coil component and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a laminated chip type coil component such as a solid transformer and a common mode choke coil.

BACKGROUND ART FIG. 10 is a sectional view showing a conventional example of a solid transformer. This involves forming a coil-shaped internal conductor pattern by printing an electrode paste mainly composed of Ag or Ag-Pd on the surface of a raw magnetic sheet made of a ferrite such as Ni-Zn based material. The raw magnetic sheet on which the conductor pattern is formed is laminated together with the dummy sheet on which the internal conductor pattern is not formed, pressed and pressed, and then fired and integrated.

Thus, the primary coil 105 is constituted by the two layers of internal conductor patterns 103 and 104 which are laminated at the center in the laminated chip 102 formed by laminating the magnetic sheets. The secondary coil 110 is constituted by a total of four layers of the internal conductor patterns 106 to 109 which are stacked. Therefore, the structure of the solid transformer 101 is such that the primary coil 105 is sandwiched between the secondary coils 110 from both sides, and electromagnetic induction coupling is generated between the primary coil 105 and the secondary coil 110. It is represented in FIG. In this equivalent circuit, C _d is the primary coil 105
When the coupling stray capacitance between the secondary coil 110, C ₁ and C ₂ represent the parallel stray capacitance generated between the internal conductor patterns 106 to 109 each between the primary side of the inner conductor patterns 103, 104 and the secondary side, 111 indicates an external electrode of the primary coil 105, 112 indicates an external electrode of the secondary coil 110, and 113 indicates an external electrode serving as an intermediate tap of the secondary coil 110.

[Problems to be Solved by the Invention] In the solid transformer 101 having the structure as shown in FIG. 10, in order to increase the electromagnetic induction coefficient between the primary coil 105 and the secondary coil 110, the internal conductor pattern on the primary side is required. Ten
Distance d between 3,104 and secondary side internal conductor patterns 107,108
It is effective to reduce the distances t ₁ and t ₂ between the internal conductor patterns (particularly, the secondary-side internal conductor patterns).

However, when the distance d between the primary-side internal conductor patterns 103, 104 and the secondary-side internal conductor patterns 107, 108 is reduced, the withstand voltage between the primary and secondary coils 105, 110 decreases. Also, the coupling stray capacitance _Cd increases. Similarly, reducing the distances t ₁ and t ₂ between the internal conductor patterns increases the parallel stray capacitances C ₁ and C ₂ . When the coupling stray capacitance _Cd and the parallel stray capacitances C ₁ and C ₂ increase, there is a problem that the high-frequency characteristics of the transformer deteriorate.

For this reason, it has been difficult to increase the electromagnetic induction coupling coefficient between the primary and secondary coils by reducing the distance between the internal conductor patterns.

The present invention has been made in view of the above-described drawbacks of the conventional example, and aims to reduce the withstand voltage between the primary and secondary coils and to increase each stray capacitance. It is another object of the present invention to provide a solid transformer capable of increasing the electromagnetic induction coupling coefficient between the primary and secondary coils and a method for manufacturing the same.

[Means for Solving the Problems] A laminated chip type coil component according to the present invention comprises a magnetic sheet and an internal conductor pattern laminated, a laminated chip formed by the laminated magnetic sheets, and a laminated chip formed by the internal conductor pattern. In a laminated chip type coil component having two coils formed therein, a low magnetic permeability region is formed in the laminated chip so as to surround each internal conductor pattern constituting each coil.

In addition, the method of manufacturing a laminated chip coil component of the present invention includes applying an electrode paste containing an inorganic compound to the surface of a raw magnetic sheet to form an internal conductor pattern, and laminating these raw magnetic sheets. And forming two coils in the laminated raw chip by the internal conductor pattern, and firing the laminated raw chip to convert the inorganic compound contained in the internal conductor pattern into a magnetic material sheet. It is characterized in that a low magnetic permeability region is formed by diffusing and surrounding each internal conductor pattern.

Further, another manufacturing method of the laminated chip type coil component of the present invention applies an inorganic compound paste to a predetermined portion of the surface of the raw magnetic sheet, and then applies an electrode paste on the portion where the inorganic compound paste is applied. Apply to form an internal conductor pattern, apply an inorganic compound paste on this internal conductor pattern, make the internal conductor pattern sandwiched by the inorganic compound paste, and laminate these raw magnetic sheets. While forming a raw chip, two coils are formed in the laminated raw chip by the internal conductor pattern, and by baking the laminated raw chip, the inorganic compound is diffused into the magnetic material sheet to wrap each internal conductor pattern. It is characterized by forming a low magnetic permeability region.

[Operation] In the multilayer chip type coil component of the present invention, since the periphery of each internal conductor pattern constituting the two coils is a low magnetic permeability region, the magnetic flux generated by each coil is generated by each internal conductor pattern. It becomes difficult to leak to the outside from the gap between them. That is, the leakage magnetic flux is reduced, and the magnetic flux penetrates through both coils from end to end of both coils, so that the electromagnetic induction coupling coefficient of the two coils increases.

As a result, even if the distance between the internal conductor patterns constituting the two coils is increased, the electromagnetic induction coupling coefficient can be increased by forming a low magnetic permeability region therebetween, and therefore, the distance between the internal conductor patterns of the two coils can be increased. By increasing the distance between the coils, the insulation withstand voltage between the two coils can be increased and the coupling stray capacitance can be reduced while keeping the electromagnetic induction coupling coefficient high. Moreover, if the electromagnetic induction coupling coefficient is increased by such a structure, as in the method of reducing the distance between the internal conductor patterns, the insulation withstand voltage is reduced,
There is no problem such as an increase in coupling stray capacitance and parallel stray capacitance.

Further, in each of the manufacturing methods of the present invention, the inorganic compound is diffused into the magnetic material sheet during firing only by adding the inorganic compound to the electrode paste (or applying the inorganic compound paste above and below the internal conductor pattern). The low magnetic permeability region is formed, so that there is no difference from the conventional manufacturing method except that the additive of the electrode paste is different (or the application process of the inorganic compound paste is added). A laminated chip type coil component with good quality can be manufactured.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

1, 2 and 3 are a sectional view, an external perspective view, and a perspective view showing a state before stacking and firing of a solid transformer 31 having a winding ratio of a primary coil and a secondary coil of 2: 4. is there. The solid transformer 31 will be described according to the manufacturing order.

First, a binder is mixed with Ni-Zn ferrite powder,
The Ni—Zn ferrite raw material was formed into a sheet having a predetermined thickness by a doctor blade method or the like, and the sheet was punched into a predetermined size to obtain a raw magnetic sheet 1. In FIG.
Reference numerals 2 and 3 denote printing sheets of the primary coil configuration group, and the coiled internal conductor patterns 4 and
5 are formed. External lead electrodes 6, 7 connected to one ends of the internal conductor patterns 4, 5, respectively, are provided at the corners of the printed sheets 2, 3, and the internal conductor patterns 4, 5 are connected to the upper layer. Are connected at the time of lamination through a through hole 8 formed at the other end of the internal conductor pattern 4,
A primary coil 9 is configured. These internal conductor patterns
The outer lead electrodes 4, 5 and the external lead electrodes 6, 7 and the through holes 8 are formed by printing an electrode paste on the raw magnetic sheet 1. This electrode paste is made of Ag or Ag-Pd
And the like, and an inorganic compound described below is added to form the low magnetic permeability region 32.

10 to 13 are printed sheets of the secondary coil configuration group,
Coiled inner conductor pattern on the surface of the raw magnetic sheet 1
14 to 17 are formed. Of these, printing sheets 10, 11
Are laminated above the printing sheets 2 and 3 of the primary coil configuration group, and an external lead electrode 18 communicating with one end of the internal conductor pattern 14 is provided at a corner portion of the printing sheet 10 of the upper layer. On the side edge of the printed sheet 11, an intermediate lead electrode 19 communicating with one end of the internal conductor pattern 15 is provided, and both internal conductor patterns 14, 15 are provided at the other end of the upper layer internal conductor pattern 14. Through the through hole 20 to form a half of the secondary coil 24. Further, the printing sheets 12 and 13 are laminated below the printing sheets 2 and 3 of the primary coil configuration group, and an external lead electrode connected to one end of the internal conductor pattern 17 is provided at a corner of the lower printing sheet 13. 21 is provided and the upper printing sheet 12
An intermediate lead electrode 22 communicating with one end of the internal conductor pattern 16 is provided on a side edge of the internal conductor pattern 16.
7 are connected via a through hole 23 provided at the other end of the internal conductor pattern 16 in the upper layer, and 1 /
2 are configured. These internal conductor patterns 14-1
7. The external extraction electrodes 18 and 21, the intermediate extraction electrodes 19 and 22 and the through holes 20 and 23 are also formed by printing an electrode paste on the raw magnetic sheet 1. This electrode paste also contains Ag or Ag-Pd as a main component, and further contains an inorganic compound described below to form the low magnetic permeability region 32.

Then, as shown in FIG. 3, the printing sheets 12 and 13 constituting half of the secondary coil 24 are placed on the dummy sheet 25 (the plurality of raw magnetic sheets 1 on which nothing is printed). Laminated, two printed sheets 2 and 3 for constituting the primary coil 9 are superimposed thereon, and printed sheets 10 and 11 constituting one half of the secondary coil 24 are further laminated, and finally a plurality of sheets are laminated. The dummy sheets 26 are laminated, and then they are pressed and compressed to form a laminated green chip, which is then fired. Fired laminated chip 27
After the surface is barrel-polished, as shown in FIG. 2, an external electrode 28 for the primary coil 9 electrically connected to the external extraction electrodes 6 and 7 and an external extraction electrode 18 and External electrode 2 for secondary coil 24 conducted to 21
9 and the external electrode 30 electrically connected to the intermediate extraction electrodes 19 and 22 are formed, and the solid transformer 31 is manufactured.

In the laminated chip 27 in which the magnetic sheets are laminated and fired, the primary coil 9 is constituted by the internal conductor patterns 4 and 5 on the primary side, and the external electrode 30 and the intermediate extraction electrode 1 are formed.
Secondary internal conductor patterns 14 to connected via 9,22
The secondary coil 24 is constituted by 17. In addition, the inorganic compound contained in the internal conductor pattern and the like diffuses into the surrounding magnetic sheet while reacting with the raw magnetic sheet 1 during firing, and lowers the magnetic permeability of the magnetic sheet. As shown, a low magnetic permeability region 32 is formed around each of the internal conductor patterns 4, 5, 14 to 17. For this reason, the amount of leakage of magnetic flux φ between the inner conductor patterns 4, 5, 14 to 17 of the primary coil 9 and the secondary coil 24 is reduced, and almost all of the magnetic flux φ is concentrated at the center of both coils 9, 24. However, the electromagnetic induction coupling coefficient of both coils 9, 24 increases. In addition, the region where the inorganic compound is diffused not only lowers the magnetic permeability of the magnetic sheet but also functions to increase the insulation resistance and increase the withstand voltage. Can be. As the inorganic compound, a compound of at least one metal included in the α group in Table 1 below, for example, an oxide, or a nitride, boride, silicide, or the like that changes to an oxide when fired is used. And the effect is great. Or,
At least one or more metal compounds included in the α group may be combined with any one or more metal compounds included in the β group. Note that the additive for generating the low magnetic permeability region 32 may be a metal of the α group or the β group, or a combination of metals of both groups. The amount of these metal compounds added is Ag
Or 0.5 to 30 wt% of solid content of Ag-Pd electrode paste
Is preferred.

The thickness d _k of low magnetic permeability region 32 and the diffusion by adjusting the type and the firing temperature of the inorganic compounds, it can be controlled.

Also, if the electromagnetic induction coupling coefficient between the primary coil and the secondary coil is increased by such a method, various methods can be used without reducing the withstand voltage as in the method of reducing the distance between the internal conductor patterns. There is no increase in stray capacitance. Conversely, since the electromagnetic induction coupling coefficient can be increased even if the space between the primary printed sheets 2 and 3 and the secondary printed sheets 10 to 13 is increased, the primary internal conductor patterns 4 and 5 and the secondary of possible to increase the distance between the inner conductor patterns 14 to 17, dielectric withstand voltage is high, bond stray capacitance C _d is reduced.

In the above manufacturing method, the inorganic compound is added to the electrode paste for forming the internal conductor pattern.In addition to this, first, the inorganic compound paste is applied to a predetermined portion of the surface of the magnetic sheet, and then this Apply the electrode paste on the portion where the inorganic compound paste is applied to form an internal conductor pattern, further apply the inorganic compound paste on the internal conductor pattern, and sandwich the internal conductor pattern with the inorganic compound paste. It is also possible to do this. Further, in the above manufacturing method, a laminated raw chip is produced by laminating a raw magnetic sheet printed with an inner conductor pattern or a raw magnetic sheet printed with a paste of an inorganic compound, but in addition to this, A method of manufacturing a laminated raw chip by alternately printing the internal conductor pattern and the raw magnetic sheet is also possible.

A solid transformer having the structure shown in FIGS. 1 to 3 was actually manufactured as follows, and its characteristics were examined. First, a binder was mixed with Ni-Zn ferrite powder having an initial magnetic permeability of about 150 to obtain a raw magnetic sheet having a thickness of 120 µm. Thereafter, an internal conductor pattern was formed on the surface of the raw magnetic sheet, and each required printing sheet was produced.
As an electrode paste for printing an internal conductor pattern or the like, an Ag-Pd-based paste composed of an alloy powder, an inorganic compound, an organic binder, and a solvent having a weight ratio of Ag to Pd of 90:10 each was used. Each internal electrode pattern and the like were formed using the electrode paste containing the inorganic compound. Where Ag−
As an inorganic compound to be added to the Pd-based paste, four types of electrode pastes were prepared using additives of compositions No. A, B, C, and D having the respective composition ratios shown in Table 2, and these electrode pastes were prepared. An internal conductor pattern and the like were formed using the same. These dummy sheets and printed sheets are laminated in the order shown in FIG. 3, pressed, laminated and integrated, and fired in air at 900 to 960 ° C. for 2 hours to obtain different compositions (No. A, B , C, D) using inorganic compounds (these samples are referred to as samples A ₁ , B ₁ , C ₁ , and D ₁ ).

FIG. 4 shows each sample prepared as described above.
For A ₁ , B ₁ , C ₁ , and D ₁ , the inductance was measured at 1 MHz, and the results were obtained for the relationship between the amount of inorganic compound added to the electrode paste (wt%) and the electromagnetic induction coupling coefficient k. I have.
Sample A uses a paste combining the compositions of only the β groups, Sample B uses a paste combining the compositions of the α group and the β group,
In each case, the rate of increase of the electromagnetic induction coupling coefficient k with the increase in the firing temperature T is relatively small. On the other hand, Samples C and D using pastes combining the compositions of only the α group
In the figure, the electromagnetic induction coupling coefficient k increases significantly as the firing temperature T increases.

As for Sample D which was effective in most of the electromagnetic induction coupling coefficient increases, the amount of the inorganic compound produced nine samples D ₁₁ to D ₁₉ with varying (wt%), each sample D ₁₁ to D _{For 19} , the inductance of the primary coil L ₁ (μH) and the inductance of the secondary coil L ₂ (μ
H), mutual inductance M (μH) and electromagnetic induction coupling coefficient k (%) were measured. Table 3 shows the results.

FIGS. 5, 6, and 7 are a sectional view, an external perspective view, and a perspective view showing a state before lamination and firing, respectively, showing a common mode choke coil according to another embodiment of the present invention. In the common mode choke coil 41, as shown in FIG. 7, print sheets 42 to 44 of the primary coil configuration group and print sheets 45 to 47 of the secondary coil configuration group are alternately stacked one by one. The internal conductor patterns 48 to 50 on the primary side formed on the printing sheets 42 to 44 are connected via through holes 51 and 52 provided on the printing sheets 45 and 46 on the secondary side, whereby the primary coil 53 is formed. It is configured. Printing sheet 45 ~
The internal conductor patterns 54 to 56 on the secondary side formed in 47 are formed with through holes 57,
A secondary coil 59 is formed by the connection via the second coil 58. That is, to explain the configuration of the primary coil 53, the internal electrode pattern 48 extends from the external lead-out electrode 60 at the corner of the first-layer printed sheet. The other end of this internal electrode pattern 48 has a through hole 61
Are formed, and the internal electrode pattern 48 is formed on the internal electrode provided on the second layer printing sheet 43 via the through hole 61 and the through hole 51 provided on the secondary side printing sheet 45 thereunder. Connected to pattern 49. further,
The other end of the internal electrode pattern 49 of the second layer also has a through hole 62.
The internal electrode pattern 49 is provided on the third layer printed sheet 44 via the through hole 62 and the through hole 52 provided on the secondary side printed sheet 46 thereunder. Connected to pattern 50. further,
The other end of the internal conductor pattern 50 is connected to an external lead electrode 63 at the corner. Similarly, to explain the configuration of the secondary coil 59, the internal electrode pattern 54 extends from the external lead-out electrode 64 at the corner of the printed sheet 45 of the first layer, and a through-hole 65 is formed at the other end. The internal electrode pattern 54 is formed on the second layer printing sheet 46 through the through hole 65 and the through hole 57 provided on the primary side printing sheet 43 thereunder. It is connected to the. Further, a through hole 66 is also provided at the other end of the internal electrode pattern 55 of the second layer, and the internal electrode pattern 55 is provided in the through hole 66 and the through hole provided in the primary printing sheet 44 thereunder. It is connected to the internal conductor pattern 56 provided on the third layer printing sheet 47 via 58. Further, the other end of the internal conductor pattern 56 is connected to an external lead electrode 67 at the corner.

Here, the internal conductor pattern and the like are formed by printing the electrode paste on the raw magnetic sheet 1,
The electrode paste is the same as that used for the solid transformer of the first embodiment. That is, the electrode paste is added with an inorganic compound such as a compound of a metal included in the α group and the β group in Table 1 above. The amount of the inorganic compound added is the same as in the first embodiment.

Then, as shown in FIG. 7, dummy sheets 68 and 69 are further laminated on the upper and lower sides, and these are pressed and pressed to form a laminated green chip, and the laminated green chip is fired. After the surface of the baked laminated chip 70 is barrel-polished, application and baking of an electrode paste results in external extraction electrodes 60, 63.
An external electrode 71 for the primary coil 53 electrically connected to the external electrode 72 and an external electrode 72 for the secondary coil 59 electrically connected to the external lead electrodes 64 and 67 are formed. The external appearance as shown in FIG. 6 is equivalent to the external appearance as shown in FIG. A common mode choke coil 41 having a circuit is manufactured.

In the laminated chip 70 thus manufactured, the primary coil 53 is configured by the primary-side internal conductor patterns 48 to 50, and the secondary coil 59 is formed by the secondary-side internal conductor patterns 54 to 56. As shown in FIG. 5, the internal conductor patterns 48 to 50 on the primary side and the internal conductor patterns 54 to 56 on the secondary side are alternately laminated. Also,
Since the inorganic compound contained in the internal conductor pattern and the like diffuses into the surrounding magnetic sheet while reacting with the raw magnetic sheet during firing, around each internal conductor pattern,
A low magnetic permeability region 73 is formed so as to surround the internal conductor pattern. For this reason, the amount of leakage of magnetic flux φ between the internal conductor patterns 48 to 50 of the primary coil 53 and the internal conductor patterns 54 to 56 of the secondary coil 59 decreases, and the electromagnetic induction coupling coefficient of both coils 53 and 59 decreases. Get higher.

A common mode choke coil having the structure shown in FIGS. 5 to 7 was actually manufactured as follows, and its characteristics were examined. First, a binder was mixed with Ni-Zn ferrite powder having an initial magnetic permeability of about 150 to obtain a raw magnetic sheet having a thickness of 120 µm. Thereafter, an internal conductor pattern was formed on the surface of the raw magnetic sheet, and each required printing sheet was produced. As an electrode paste for printing an internal conductor pattern, etc., an Ag and Pd alloy containing 90% by weight of each alloy powder, an inorganic compound, an organic binder and a solvent having a weight ratio of 90:10, respectively.
-A Pd-based paste was used. Each internal electrode pattern and the like were formed using the electrode paste containing the inorganic compound. Here, as the inorganic compound to be added to the Ag-Pd-based paste, four types of electrode pastes were prepared using additives of compositions No. A, B, C, and D having the respective composition ratios shown in Table 2 above. An internal electrode paste and the like were formed using these electrode pastes. These dummy sheets and printed sheets are laminated in the order shown in FIG.
Baking for 2 hours at a temperature of 0 to 960 ° C, different compositions (No.A, B,
Four types of common mode choke coils using inorganic compounds (C, D) (these samples are referred to as samples A ₂ , B ₂ , C ₂ , and D ₂ ) were produced.

Each sample A ₂ , B ₂ , C ₂ , D ₂ prepared as described above
The relationship between the amount of the inorganic compound added to the electrode paste (wt%) and the electromagnetic induction coupling coefficient k was determined under the same conditions as for the solid transformer. The result is shown in FIG. In case of common mode choke coil, sample A ₂
And B ₂ rate of increase in the electromagnetic induction coupling coefficient k according to any increase in the firing temperature T is relatively small. On the other hand, sample C ₂ and
In D ₂ , the electromagnetic induction coupling coefficient k increases significantly as the firing temperature T increases.

Also, for the most electromagnetic induction coupling Sample D ₂ which had effective was the increase of the coefficient, the addition amount of the inorganic compound by changing the (wt%) to prepare a seven samples D ₂₁ to D _27, each of the samples D ₂₁ ~ inductance L ₁ of each primary coil for D ₂₇ (μH), the secondary coil inductance L ₂ (mu
H), mutual inductance M (μH), electromagnetic induction coupling coefficient k (%), and DC breakdown voltage BDV (volt) between the primary coil and the secondary coil were measured. Table 4 shows the results.

From this, it can be seen that the common mode choke coil (sample D ₂ ) using the internal conductor pattern of composition No. D greatly increases both the electromagnetic coupling coefficient and the DC breakdown voltage.

[Effects of the Invention] According to the present invention, the magnetic flux leakage from between the internal conductor patterns of both coils can be reduced by the low magnetic permeability region, and the electromagnetic induction coupling coefficient between the two coils can be increased. . In addition, it is possible to increase the withstand voltage between the two coils while increasing the electromagnetic induction coefficient between the two coils. Further, while the electromagnetic induction coupling coefficient is increased, the coupling stray capacitance between both coils can be reduced, and the high-frequency characteristics of the transformer can be improved.

Moreover, unlike the method of reducing the distance between the internal conductor patterns, problems such as a decrease in insulation withstand voltage and an increase in coupling stray capacitance and parallel stray capacitance do not occur.

Therefore, according to the present invention, it is possible to manufacture a laminated chip coil component having a high electromagnetic induction coupling coefficient, a high dielectric strength voltage, a reduced stray capacitance, and a good high-frequency characteristic.

Further, according to the manufacturing method of the present invention, the multilayer chip coil component of the present invention can be manufactured using the conventional manufacturing process as it is, and the productivity is excellent.

[Brief description of the drawings]

1 is a cross-sectional view showing one embodiment of the present invention, FIG. 2 is an external perspective view of the same, FIG. 3 is a perspective view showing a state before lamination and firing, and FIG. FIG. 5 is a diagram showing the relationship between the amount of compound added to the electrode paste and the electromagnetic induction coupling coefficient, FIG. 5 is a cross-sectional view showing another embodiment of the present invention, FIG. FIG. 8 is a perspective view showing the same state before lamination and firing, FIG. 8 is an equivalent circuit diagram of the above, and FIG. 9 is a diagram showing the relationship between the amount of inorganic compound added to the electrode paste and the electromagnetic induction coupling coefficient in the above embodiment. FIG. 10 is a sectional view of a conventional example, and FIG. 11 is an equivalent circuit diagram of the same. 1 ... Raw magnetic sheet 4,5; 48-50 ... Inner conductor pattern on primary side 9; 53 ... Primary coil 14-17; 54-56 ... Inner conductor pattern on secondary side 24; 59 ... Secondary coil 27; 70 ... Laminated chip 32; 73 ... Low magnetic permeability area

Continuation of front page (72) Inventor Katsuhisa Imada 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Murata Manufacturing Co., Ltd. (56) References JP-A-64-24407 (JP, A) JP-A-2-165607 (JP, A) JP-A-2-260405 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01F 17/00 H01F 41/04

Claims (3)

(57) [Claims] 1. A laminated chip type coil component comprising a magnetic material sheet and an internal conductor pattern laminated, a laminated chip formed by the laminated magnetic material sheets, and two coils formed in the laminated chip by the internal conductor pattern. A laminated chip type coil component, wherein a low magnetic permeability region is formed in a laminated chip so as to surround each internal conductor pattern constituting each coil. 2. An electrode paste to which an inorganic compound is added is applied to the surface of a raw magnetic sheet to form an internal conductor pattern, and these raw magnetic sheets are laminated to form a laminated raw chip, Two coils are formed in the laminated raw chip by the conductor pattern, and the inorganic compound contained in the internal conductor pattern is diffused into the magnetic material sheet by firing the laminated raw chip so as to wrap each internal conductor pattern. A method for manufacturing a laminated chip coil component, wherein a low magnetic permeability region is formed. 3. An inorganic compound paste is applied to a predetermined portion of the surface of the raw magnetic sheet, and then an electrode paste is applied on the portion where the inorganic compound paste is applied to form an internal conductor pattern. An inorganic compound paste is applied on the internal conductor pattern, the internal conductor pattern is sandwiched between the inorganic compound pastes, and a laminated raw chip is formed by laminating these magnetic raw sheets, and is laminated by the internal conductor pattern. Two coils are formed in the raw chip, and the inorganic compound is diffused into the magnetic material sheet by firing the laminated raw chip, and a low magnetic permeability region is formed so as to surround each internal conductor pattern. A method for manufacturing a laminated chip type coil component.