JPH09129477A - Laminated capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated capacitor having a low electrostatic capacitance and a high quality factor and having no defect in its internal structure. SOLUTION: The size of a dielectric layer 21 and the shape of internal electrode pieces 22b are set in such a manner that the ratio of the width D of the internal electrode pieces 22b and the width W of the dielectric layer 21 becomes the prescribed value in the range of 0.1 to 0.4, and at the same time, the ratio (L1/L) of the length L1 of the internal electrode pieces 22b and the length L of the dielectric layer 21 becomes in the range of 0.5 to 0.9. As a result, the dielectric layers of the upper and the lower layers of the dielctric layer 1 can be sufficiently adhered directly with each other on the area, in the widthwise direction and the longitudinal direction of the internal electrode pieces without intermediary of the internal electrode pieces 22b. As a result, the generation of the structural defects such as cracks, delamination, etc., can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer capacitor, and more particularly to a high-frequency multilayer capacitor having a small capacitance.

[0002]

2. Description of the Related Art FIGS. 2 to 4 show a conventional multilayer capacitor. 2 is an exploded perspective view, FIG. 3 is a plan view, and FIG.
3 is a sectional view taken along line AA of FIG.

[0003] In the drawing, reference numeral 10 denotes a multilayer capacitor in which a dielectric body 13 formed by alternately laminating dielectric layers 11 and internal electrodes 12 and internal electrodes are alternately connected in parallel at both ends of the dielectric body 13. And a pair of external electrodes 14.

The internal electrode 12 is composed of an internal electrode piece 12a provided near the central region of the dielectric layer 11 and an internal electrode lead portion 12b provided along the external electrode 14 and connected to the external electrode 14. The internal electrode piece 12a is connected to the external electrode 14 via the internal electrode lead-out portion 12b.

[0005] The dielectric layer 11 is formed of a ceramic sintered body on a rectangular sheet, and the ceramic sintered body is formed of a dielectric ceramic material containing, for example, barium titanate as a main component. The internal electrode 12 is formed of a metal thin film obtained by sintering a metal paste. As the metal paste, for example, an electrode mainly containing a noble metal material such as Pd or Ag-Pd is used. It is formed of the same material as the part electrode 12 without the external electrode 14, and its surface is plated with solder to improve solder wettability.

[0006]

In recent years, communication frequencies used in mobile communication devices and the like have been changed to high frequency bands (G-bands).
(Hz band), and accordingly, multilayer capacitors used in mobile communication devices and the like have to be adapted to the high frequency band.

In order to make a multilayer capacitor compatible with a high frequency band, it is necessary to increase the Q value of a multilayer capacitor having a low capacitance, for example, a capacitance of 10 pF or less in a high frequency range.

As described above, in order to increase the Q value of a low-capacitance multilayer capacitor in a high-frequency range, it is necessary to reduce the electric resistance of internal electrodes.

As a method of reducing the electric resistance of the internal electrode, there are methods of increasing the area of the internal electrode and increasing the thickness of the internal electrode.

However, when the area of the internal electrodes is increased, the capacitance becomes too large. Therefore, it is necessary to increase the distance between the internal electrodes and reduce the number of layers.
For this reason, the electric resistance between the internal electrodes increases or the Q value decreases.

When the internal electrode is made thicker, the electric resistance of the internal electrode is lowered. However, due to the local accumulation of the internal electrode, the portion is locally thickened and the internal strain is increased.
Due to oxidative expansion of the internal electrode made of d or the like, the incidence of structural defects (delamination, cracks, etc.) increases.

In view of the above problems, an object of the present invention is to provide a multilayer capacitor having a low capacitance, a high Q value and no internal structural defects.

[0013]

In order to achieve the above object, the present invention provides a rectangular parallelepiped shaped element body in which dielectric layers and internal electrode layers are alternately laminated, and the element body. A pair of external electrodes in which the internal electrodes formed in the internal electrode layer are alternately connected in parallel at both ends of the internal electrode, the internal electrodes being formed in the same layer,
It has two internal electrode pieces that extend substantially in parallel at a predetermined interval, and the ratio (D / W) of the width D of the internal electrode pieces to the width W of the dielectric layer is 0.1 or more and 0.4 or less. We propose a multilayer capacitor set to a predetermined value within the range.

According to the multilayer capacitor, the ratio (D / W) of the width D of the internal electrode piece to the width W of the dielectric layer is 0.
Since it is set to a predetermined value within the range of 1 or more and 0.4 or less, it is necessary and sufficient that the area of the internal electrode piece and the ratio in which the upper and lower dielectric layers directly adhere to each other in the width direction without interposing the internal electrode piece Can be obtained.

According to a second aspect of the present invention, a rectangular parallelepiped element body formed by alternately laminating dielectric layers and internal electrode layers and internal electrodes formed on the internal electrode layer at both ends of the element body are provided. A multilayer capacitor comprising a pair of external electrodes that are alternately connected in parallel, wherein the internal electrodes have two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. Proposing a multilayer capacitor in which the ratio (L1 / L) of the length L1 of the internal electrode piece to the length L of the dielectric layer is set to a predetermined value within the range of 0.5 or more and 0.9 or less. To do.

According to the multilayer capacitor, the ratio of the length L1 of the internal electrode piece to the length L of the dielectric layer (L1 /
L) is set to a predetermined value within the range of 0.5 or more and 0.9 or less, so that the upper and lower dielectric layers can be directly connected in the area of the internal electrode piece and in the length direction without the internal electrode piece. A necessary and sufficient ratio of close contact can be obtained.

According to a third aspect of the present invention, a rectangular parallelepiped element body formed by alternately laminating dielectric layers and internal electrode layers and internal electrodes formed on the internal electrode layer at both ends of the element body are provided. A multilayer capacitor comprising a pair of external electrodes that are alternately connected in parallel, wherein the internal electrodes have two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. , The ratio (D / W) of the width D of the internal electrode piece to the width W of the dielectric layer is set to a predetermined value within the range of 0.1 or more and 0.4 or less, and Length L1
A multilayer capacitor is proposed in which the ratio (L1 / L) of the dielectric layer to the length L of the dielectric layer is set to a predetermined value within the range of 0.5 or more and 0.9 or less.

According to the multilayer capacitor, the ratio (D / W) of the width D of the internal electrode piece to the width W of the dielectric layer is 0.
It is set to a predetermined value within the range of 1 or more and 0.4 or less, and the length L1 of the internal electrode piece and the length L of the dielectric layer are set.
(L1 / L) is set to a predetermined value within the range of 0.5 or more and 0.9 or less, the area of the internal electrode piece and the dielectric material of the upper and lower layers directly without the internal electrode piece. A sufficient ratio of the layers to be in close contact can be obtained.

According to a fourth aspect of the present invention, a rectangular parallelepiped element body formed by alternately laminating dielectric layers and internal electrode layers and internal electrodes formed on the internal electrode layer at both ends of the element body are provided. A multilayer capacitor comprising a pair of external electrodes that are alternately connected in parallel, wherein the internal electrodes have two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. , In a cross section perpendicular to the axis connecting the external electrodes at both ends, the length T in the longitudinal direction of the cross section and the outside of the cross section extending parallel to the internal electrode surface from the peripheral edge of the formation region of the internal electrode in the cross section. Ratio to the distance T1 to the side (T
1 / T) is the lateral length W of the cross section and the distance W from the peripheral edge of the internal electrode formation region in the cross section to the outer edge of the cross section extending in the direction perpendicular to the internal electrode surface.
A multilayer capacitor that is set to be substantially equal to the ratio (W1 / W) to 1 and these ratios (T1 / T, W1 / W) are set to a predetermined value within the range of 0.15 to 0.4. suggest.

According to the multilayer capacitor, the ratio (T) to the distance T1 from the peripheral edge of the area where the internal electrode is formed in the cross section to the outer side of the cross section that extends parallel to the internal electrode surface.
1 / T) is the lateral length W of the cross section and the distance W from the peripheral edge of the internal electrode formation region in the cross section to the outer edge of the cross section extending in the direction perpendicular to the internal electrode surface.
It is set to be almost equal to the ratio (W1 / W) to 1 and these ratios (T1 / T, W1 / W) are set to a predetermined value within the range of 0.15 or more and 0.4 or less. A sufficient distance can be obtained between the conductor existing outside the body and the internal electrode piece.

Further, in the present invention, a rectangular parallelepiped element body formed by alternately laminating dielectric layers and internal electrode layers and internal electrodes formed on the internal electrode layers at both ends of the element body are provided. A multilayer capacitor comprising a pair of external electrodes that are alternately connected in parallel, wherein the internal electrodes have two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. , The ratio (T2 / T) of the vertical length T of the cross section perpendicular to the axis connecting the external electrodes at both ends to the vertical length T2 of the internal electrode formation region in the cross section is 0.
We propose a multilayer capacitor set to a predetermined value within the range of 2 or more and 0.7 or less.

According to the multilayer capacitor, the ratio (T2 / T) of the length T in the vertical direction of the cross section to the length T2 in the vertical direction of the area where the internal electrodes are formed is 0.2 or more and 0.7. Since it is set to a predetermined value within the following range, a sufficient distance can be obtained between the conductor existing outside the element body and the surface of the internal electrode piece.

According to a sixth aspect of the present invention, a rectangular parallelepiped element body formed by alternately laminating dielectric layers and internal electrode layers and internal electrodes formed on the internal electrode layer at both ends of the element body are provided. A multilayer capacitor comprising a pair of external electrodes that are alternately connected in parallel, wherein the internal electrodes have two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. , The length T2 in the vertical direction of the formation region of the internal electrodes in a cross section perpendicular to the axis connecting the external electrodes at both ends.
And a thickness T3 of the internal electrode piece (T3 / T2) is set to a predetermined value within the range of 0.004 or more and 0.1 or less.

According to the multilayer capacitor, the ratio (T3 / T2) of the longitudinal length T2 of the internal electrode formation region in the cross section to the internal electrode piece thickness T3 is 0.00.
Since it is set to a predetermined value within the range of 4 or more and 0.1 or less, the thickness of the internal electrode piece can be made sufficiently thick and the resistance thereof can be reduced.

According to a seventh aspect of the present invention, a rectangular parallelepiped element body formed by alternately laminating dielectric layers and internal electrode layers and internal electrodes formed on the internal electrode layer at both ends of the element body are provided. A multilayer capacitor comprising a pair of external electrodes that are alternately connected in parallel, wherein the internal electrodes have two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. , In a cross section perpendicular to the axis connecting the external electrodes at both ends, the length T in the longitudinal direction of the cross section and the outside of the cross section extending parallel to the internal electrode surface from the peripheral edge of the formation region of the internal electrode in the cross section. Ratio to the distance T1 to the side (T
1 / T) is the lateral length W of the cross section and the distance W from the peripheral edge of the internal electrode formation region in the cross section to the outer edge of the cross section extending in the direction perpendicular to the internal electrode surface.
It is set to be almost equal to the ratio (W1 / W) to 1 and these ratios (T1 / T, W1 / W) are set to a predetermined value within the range of 0.15 or more and 0.4 or less and both ends. And a longitudinal length T of a cross section perpendicular to the axis connecting the external electrodes, and a longitudinal length T of the formation region of the internal electrode in the cross section.
A multilayer capacitor having a ratio (T2 / T) with 2 set to a predetermined value within the range of 0.2 or more and 0.7 or less is proposed.

According to the multilayer capacitor, the ratio (T) to the distance T1 from the peripheral edge of the area where the internal electrode is formed in the cross section to the outer side of the cross section extending parallel to the internal electrode surface.
1 / T) is the lateral length W of the cross section and the distance W from the peripheral edge of the internal electrode formation region in the cross section to the outer edge of the cross section extending in the direction perpendicular to the internal electrode surface.
The ratio (T1 / T, W1 / W) is set to be substantially equal to the ratio (W1 / W) to 1 and is set to a predetermined value within the range of 0.15 or more and 0.4 or less. The length T in the vertical direction and the length T2 in the vertical direction of the formation region of the internal electrode.
Since the ratio (T2 / T) is set to a predetermined value within the range of 0.2 or more and 0.7 or less, between the conductor existing outside the element body and the internal electrode piece and the internal electrode surface. You can get enough distance.

Further, according to the present invention, a rectangular parallelepiped element body formed by alternately laminating dielectric layers and internal electrode layers and internal electrodes formed on the internal electrode layer at both ends of the element body are provided. A multilayer capacitor comprising a pair of external electrodes that are alternately connected in parallel, wherein the internal electrodes have two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. , In a cross section perpendicular to the axis connecting the external electrodes at both ends, the length T in the longitudinal direction of the cross section and the outside of the cross section extending parallel to the internal electrode surface from the peripheral edge of the formation region of the internal electrode in the cross section. Ratio to the distance T1 to the side (T
1 / T) is the lateral length W of the cross section and the distance W from the peripheral edge of the internal electrode formation region in the cross section to the outer edge of the cross section extending in the direction perpendicular to the internal electrode surface.
It is set to be almost equal to the ratio (W1 / W) to 1 and these ratios (T1 / T, W1 / W) are set to a predetermined value within the range of 0.15 or more and 0.4 or less and both ends. The longitudinal length T2 of the area where the internal electrode is formed and the thickness T of the internal electrode piece in a cross section that intersects at right angles with the axis connecting the external electrodes.
A multilayer capacitor is proposed in which the ratio (T3 / T2) with respect to 3 is set to a predetermined value within the range of 0.004 or more and 0.1 or less.

According to the multilayer capacitor, the ratio of the distance (T1) from the peripheral edge of the area where the internal electrode is formed in the cross section to the outer edge of the cross section extending parallel to the internal electrode surface (T
1 / T) is the lateral length W of the cross section and the distance W from the peripheral edge of the internal electrode formation region in the cross section to the outer edge of the cross section extending in the direction perpendicular to the internal electrode surface.
It is set to be substantially equal to the ratio (W1 / W) to 1 and these ratios (T1 / T, W1 / W) are set to a predetermined value within the range of 0.15 or more and 0.4 or less. The ratio (T3 / T2) of the length T2 in the vertical direction of the formation region of the internal electrode and the thickness T3 of the internal electrode piece is set to a predetermined value within the range of 0.004 or more and 0.1 or less. Therefore, it is possible to obtain a necessary and sufficient distance between the conductor existing outside the element body and the internal electrode piece, and it is possible to form the internal electrode piece to a necessary and sufficient thickness and reduce its resistance.

According to a ninth aspect, in the multilayer capacitor according to the eighth aspect, a longitudinal length T of a cross section perpendicular to an axis connecting the external electrodes at both ends and a formation region of the internal electrode in the cross section. Of the vertical length of T2 (T2
We propose a multilayer capacitor in which / T) is set to a predetermined value within the range of 0.2 or more and 0.7 or less.

According to the multilayer capacitor, the ratio (T) to the distance T1 from the peripheral edge of the area where the internal electrode is formed in the cross section to the outer side of the cross section extending parallel to the internal electrode surface.
1 / T) is the lateral length W of the cross section and the distance W from the peripheral edge of the internal electrode formation region in the cross section to the outer edge of the cross section extending in the direction perpendicular to the internal electrode surface.
It is set to be substantially equal to the ratio (W1 / W) to 1 and these ratios (T1 / T, W1 / W) are set to a predetermined value within the range of 0.15 or more and 0.4 or less. The ratio (T3 / T2) of the length T2 in the vertical direction of the formation region of the internal electrode to the thickness T3 of the internal electrode piece is set to a predetermined value within the range of 0.004 or more and 0.1 or less. , The ratio (T2 / T) of the vertical length T of the cross section perpendicular to the axis connecting the external electrodes at both ends to the vertical length T2 of the internal electrode forming region in the cross section is 0. 2 or more 0.7
Since it is set to a predetermined value within the following range, a sufficient distance can be obtained between the conductor existing outside the element body and the internal electrode piece, and the thickness of the internal electrode piece can be formed to be sufficiently thick. Therefore, the resistance can be reduced.

According to a tenth aspect of the present invention, in the multilayer capacitor according to any of the fourth to ninth aspects, the ratio (D / W) of the width D of the internal electrode piece to the width W of the dielectric layer is 0. ．
We propose a multilayer capacitor set to a predetermined value within the range of 1 or more and 0.4 or less.

According to the multilayer capacitor, a sufficient distance can be obtained between the conductor existing outside the element body and the internal electrode piece, and further, the internal electrode piece can be formed to have a necessary and sufficient thickness, and the resistance thereof can be increased. In addition, the area of the internal electrode piece and the ratio of the upper and lower dielectric layers directly contacting each other in the width direction without interposing the internal electrode piece can be obtained sufficiently.

In the eleventh aspect, the fourth to tenth aspects are provided.
In the multilayer capacitor according to any one of items 1 to 5, the ratio of the length L1 of the internal electrode piece to the length L of the dielectric layer (L1 /
We propose a multilayer capacitor in which L) is set to a predetermined value within the range of 0.5 or more and 0.9 or less.

According to the multilayer capacitor, the distance between the conductor existing outside the element body and the internal electrode piece can be obtained sufficiently, and further, the thickness of the internal electrode piece can be formed to be necessary and sufficient, and the resistance thereof can be increased. In addition, the area of the internal electrode piece and the ratio of the upper and lower dielectric layers directly adhering to each other without interposing the internal electrode piece can be sufficiently obtained.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a multilayer capacitor of a first example in one embodiment, FIG. 5 is a plan sectional view, and FIG. 6 is a sectional view taken along line BB in FIG. In the figure, reference numeral 20 denotes a multilayer capacitor, which is a dielectric layer 2
Element body 23 formed by alternately laminating 1 and internal electrodes 22;
It is composed of a pair of external electrodes 24 that alternately connect the internal electrodes 22 in parallel at both ends of the element body 23.

The dielectric layer 21 is made of a rectangular sheet-shaped ceramic sintered body, and the sintered body is made of a dielectric ceramic material formed by firing a green sheet containing barium titanate as a main component, for example.

Each of the pair of internal electrodes 22 adjacent to each other via the dielectric layer 21 has two internal electrode pieces 22b adjacent to each other via one slit 22a. Each internal electrode piece 22b has a rectangular shape, and the long side of the internal electrode piece 22b is substantially perpendicular to the external electrode 24. Further, the width of the two internal electrode pieces 22b in the same internal electrode 22 and the internal electrode 22 facing each other with the dielectric layer 21 in between.
The widths of the internal electrode pieces 22b between them are formed to be equal to each other.

Further, the base end portion of the internal electrode piece 22b is connected to the external electrode 24 via an internal electrode lead-out portion 22c provided along the external electrode 24.

On the other hand, in the pair of internal electrodes 22 adjacent to each other with the dielectric layer 21 in between, all the side edge portions of the internal electrode 22 of one layer facing one side of the internal electrode piece 22b are the other layers. The inner electrode 22 faces all the side edges of the inner electrode piece 22b facing the other side.

These internal electrodes 22 are made of a metal thin film obtained by sintering a thin film of a conductive paste, and as the conductive paste, for example, one containing palladium powder as a main component is used. The external electrode 24 is also formed of the same material as the internal electrode 22, and its surface is plated with solder to improve solder wettability.

Here, as shown in FIG. 5, the internal electrode piece 2
The ratio (D / W) between the width D of 2b and the width W of the dielectric layer 21 becomes a predetermined value within the range of 0.1 or more and 0.4 or less, and
The size of the dielectric layer 21 is set so that the ratio (L1 / L) of the length L1 of the internal electrode piece 22b and the length L of the dielectric layer 21 becomes a predetermined value within the range of 0.5 or more and 0.9 or less. The shape of the inner electrode piece 22b is set.

In this embodiment, the lengths of D, W, L1 and L are 100 μm, 460 μm, 600 μm and 900, respectively.
It was set to μm.

This multilayer capacitor was manufactured as follows. First, an organic binder was added to the dielectric raw material powder.
% By weight, and further 50% by weight of water, and these were put into a ball mill and mixed well to prepare a slurry of a dielectric ceramic raw material.

Next, after putting this slurry in a vacuum defoamer to defoam it, put it in a reverse roll coater to form a thin film of this slurry on a polyester film,
This thin film is dried by heating to 100 ° C. on a polyester film, punched out, and 10 cm square, about 2 mm thick.
A green sheet of 0 μm was obtained.

On the other hand, 10 g of palladium powder having an average particle diameter of 1.5 μm and 0.9 g of ethyl cellulose dissolved in 9.1 g of butyl carbitol were placed in a stirrer.
By stirring for 10 hours, a conductive paste for an internal electrode was obtained.

After that, the internal electrode pattern described above is applied to 5
Using each of the screens having zero, a pattern of the internal electrode made of the conductive paste was printed on one surface of the green sheet, and dried.

Next, a plurality of green sheets were laminated with the printing surface facing upward, and further, unprinted green sheets were laminated on the upper and lower surfaces of this laminate. Then
This laminate was pressed at a temperature of about 50 ° C. by applying a pressure of about 40 tons in the thickness direction. Thereafter, the laminate was cut into a lattice to obtain about 50 laminated chips.

Next, this laminated chip is placed in a furnace capable of firing in an atmosphere and heated to 600 ° C. in the atmosphere to burn the organic binder, and then the atmosphere in the furnace is set in the atmosphere to heat the laminated chip. The temperature was maintained at 600 ° C. to 1150 ° C. (maximum temperature), which is the firing temperature, for 3 hours. After this, 1
The temperature was lowered to 600 ° C. at a rate of 00 ° C./hr and cooled to room temperature to obtain a sintered body chip.

Next, a conductive paste composed of silver, glass frit and vehicle is applied to the side surface of the sintered body chip where the internal electrodes are exposed and dried, and this is dried in air at 800 ° C.
Baking at a temperature of 15 minutes to form a silver electrode layer, further depositing copper thereon by electroless plating, and providing a Pb-Sn solder layer thereon by electroplating to form a pair of external electrodes did. As a result, a multilayer capacitor was obtained.

According to the multilayer capacitor having the above-described structure, the area of the internal electrode piece 22b and the proportion of the upper and lower dielectric layers 21 directly adhering to each other in the width direction and the length direction without interposing the internal electrode piece 22b. Because you can get enough,
It is possible to prevent the occurrence of structural defects such as cracks and delamination.

Next, a second embodiment of the present invention will be described.
In the second embodiment, in addition to the structure of the first embodiment, as shown in FIG. 7, the length T in the vertical direction of the cross section and the inner electrode forming region 25 in the cross section are parallel to the inner electrode surface. The ratio (T1 / T) with the distance T1 to the outer edge of the cross section extending to
The ratio (W1 / W) of the lateral length W of the cross section and the distance W1 from the peripheral edge of the internal electrode formation region 25 to the outer edge of the cross section extending in the direction perpendicular to the internal electrode surface is set to be substantially equal to, These ratios (T1 / T, W1 / W) are set to predetermined values within the range of 0.15 or more and 0.4 or less. Along with this, the ratio (T2 / T) of the vertical length T of the cross section to the vertical length T2 of the internal electrode forming region 25 is 0.2.
It is set to a predetermined value within the range of not less than 0.7 and not more than 0.7.

In this embodiment, T1, T2, and T are set to 100 μm, 260 μm, and 460 μm, respectively, and W1 and W are set.
Are set to 100 μm and 460 μm, respectively.

According to the multilayer capacitor having the above structure, the ratio (T1 / T) between the distance T1 and the distance T is set to be substantially equal to the ratio (W1 / W) between the length W and the distance W1. Ratio (T1 / T, W1 / W) is 0.15 or more 0.4
Since the ratio (T2 / T) of the length T and the length T2 is set to a predetermined value within the range of 0.2 or more and 0.7 or less as well as being set to a predetermined value within the following range, Since a sufficient distance can be obtained between the conductor such as a circuit board existing outside the element body 23 and the internal electrode piece 22b, the stray capacitance between the conductor existing outside the element body 23 and the internal electrode piece 22b can be reduced. Generation can be suppressed, and the capacitance of the designed value can be obtained even in a low-capacity capacitor.

Therefore, when this multilayer capacitor is mounted on a circuit board, the stray capacitance generated between the internal electrode 22 and the conductor pattern on the circuit board is mounted so that the internal electrode surface is parallel to the circuit board. At this time, or even when mounted so that the internal electrode surface is perpendicular to the circuit board, it will be very small and almost the same, so depending on the mounting state of the multilayer capacitor on the circuit board, The obtained capacitance does not change, and a nearly specified value can be obtained.

Next, a third embodiment of the present invention will be described.
In the third embodiment, in addition to the configuration of the first or second embodiment, as shown in FIG. 8, the longitudinal length T2 of the internal electrode formation region 25 and the thickness T3 of the internal electrode piece 22b in the cross section are shown.
(T3 / T2) is set to a predetermined value within the range of 0.004 or more and 0.1 or less. In this embodiment, T3,
T2 was set to 8 μm and 260 μm, respectively.

According to the multilayer capacitor having the above-described structure, the ratio (T3 / T) of the length T2 of the internal electrode forming region 25 in the cross section in the vertical direction to the thickness T3 of the internal electrode piece 22b is obtained.
Since 2) is set to a predetermined value within the range of 0.004 or more and 0.1 or less, the internal electrode piece 22b can be formed to a necessary and sufficient thickness, and its resistance can be reduced. A high Q value can be obtained in the range.

Incidentally, these embodiments are merely examples, and the present invention is not limited to these. For example, FIGS.
As shown in, two internal electrode pieces 22b existing in the same layer
The same effect can be obtained even if the length and width of the are different.

[0058]

As described above, according to the first aspect of the present invention, the ratio (D) of the width D of the internal electrode piece to the width W of the dielectric layer is set.
/ W) is set to a predetermined value within the range of 0.1 or more and 0.4 or less, the upper and lower dielectric layers can be directly formed in the area of the internal electrode piece and in the width direction without interposing the internal electrode piece. Since a sufficient adhesion ratio can be obtained, the occurrence of structural defects such as cracks and delamination can be prevented.

According to claim 2, the ratio (L1 / L) of the length L1 of the internal electrode piece to the length L of the dielectric layer is 0.5.
Since it is set to a predetermined value within the range of 0.9 or more, the area of the internal electrode piece and the proportion of the upper and lower dielectric layers directly adhering in the length direction without interposing the internal electrode piece are necessary and sufficient. As a result, structural defects such as cracks and delamination can be prevented from occurring.

According to the third aspect of the invention, the ratio (D / W) of the width D of the internal electrode piece to the width W of the dielectric layer is 0.1 or more.
It is set to a predetermined value within the range of 4 or less, and the ratio of the length L1 of the internal electrode piece to the length L of the dielectric layer (L1
/ L) is set to a predetermined value within the range of 0.5 or more and 0.9 or less, the area of the internal electrode piece and the ratio of the upper and lower dielectric layers directly adhering to each other without interposing the internal electrode piece. Therefore, it is possible to prevent structural defects such as cracks and delamination from occurring.

Further, according to claim 4, the distance T1 from the peripheral edge of the area where the internal electrode is formed in the cross section perpendicular to the axis connecting the external electrodes at both ends to the outer edge of the cross section extending parallel to the internal electrode surface. And the ratio (T1 / T) to the lateral length W of the cross section and the outer edge of the cross section extending in the direction perpendicular to the internal electrode surface from the peripheral edge of the internal electrode formation region in the cross section. Is set to be approximately equal to the ratio of the distance W1 to W1 (W1 / W), and these ratios (T1 / T, W1 / W)
Is set to a predetermined value within the range of 0.15 or more and 0.4 or less, so that the distance between the conductor existing inside the element body and the internal electrode piece can be obtained sufficiently, It is possible to suppress the generation of stray capacitance between the conductor and the internal electrode piece existing in, and it is possible to obtain the designed capacitance even in a low-capacity capacitor.

According to the present invention, the length T in the vertical direction of the cross section intersecting at right angles with the axis connecting the external electrodes at both ends, and the length T2 in the vertical direction of the formation region of the internal electrode in the cross section. Since the ratio (T2 / T) is set to a predetermined value within the range of 0.2 or more and 0.7 or less, the distance between the conductor existing outside the element body and the surface of the internal electrode piece is necessary and sufficient. Therefore, it is possible to suppress the generation of stray capacitance between the conductor existing outside the element body and the internal electrode piece, and it is possible to obtain the designed capacitance even in the case of a low capacitance capacitor.

According to the sixth aspect, the ratio (T3) of the vertical length T2 of the internal electrode forming region to the internal electrode piece thickness T3 in the cross section perpendicular to the axis connecting the external electrodes at both ends. Since / T2) is set to a predetermined value within the range of 0.004 or more and 0.1 or less, the internal electrode piece can be formed to have a necessary and sufficient thickness and its resistance can be reduced. A high Q value can be obtained in the high frequency range.

According to claim 7, the distance from the peripheral edge of the formation region of the internal electrode in the cross section perpendicular to the axis connecting the external electrodes at both ends to the outer edge of the cross section extending parallel to the internal electrode surface. The ratio (T1 / T) to T1 is the lateral length W of the cross section and the outer edge of the cross section extending from the peripheral edge of the internal electrode formation region in the cross section in the direction perpendicular to the internal electrode surface. Ratio to distance W1 (W1 / W)
Are set to be approximately equal to and the ratio of these (T1 / T, W1 /
W) is set to a predetermined value within the range of 0.15 or more and 0.4 or less, and the ratio of the vertical length T2 of the cross section to the vertical length T2 of the internal electrode formation region ( Since T2 / T) is set to a predetermined value within the range of 0.2 or more and 0.7 or less, the distance between the conductor existing outside the element body and the internal electrode piece and the internal electrode surface is necessary and sufficient. Therefore, it is possible to suppress the generation of stray capacitance between the conductor existing outside the element body and the internal electrode piece, and it is possible to obtain the designed capacitance even in the case of a low capacitance capacitor.

According to the eighth aspect, the distance from the peripheral edge of the internal electrode forming region in the cross section perpendicular to the axis connecting the external electrodes at both ends to the outer edge of the cross section extending parallel to the internal electrode surface. The ratio (T1 / T) to T1 is the lateral length W of the cross section and the outer edge of the cross section extending from the peripheral edge of the internal electrode formation region in the cross section in the direction perpendicular to the internal electrode surface. Ratio to distance W1 (W1 / W)
Are set to be approximately equal to and the ratio of these (T1 / T, W1 /
W) is set to a predetermined value within the range of 0.15 or more and 0.4 or less, and further, the ratio of the longitudinal length T2 of the formation region of the internal electrode in the cross section to the thickness T3 of the internal electrode piece. Since (T3 / T2) is set to a predetermined value within the range of 0.004 or more and 0.1 or less, a sufficient distance can be obtained between the conductor existing outside the element body and the internal electrode piece. , The thickness of the internal electrode piece can be formed sufficiently thick,
Since the resistance can be reduced, it is possible to suppress the generation of stray capacitance between the conductor existing outside the element body and the internal electrode piece, and it is possible to obtain the designed capacitance even in a low-capacity capacitor. In addition, it is possible to obtain a high Q value in a high frequency range.

Further, according to claim 9, in addition to the above effects, the generation of stray capacitance between the conductor existing outside the element body and the internal electrode piece can be further suppressed, and even in a low capacitance capacitor. The designed capacitance can be obtained.

According to the tenth aspect, in addition to the above effect, the ratio (D) of the width D of the internal electrode piece to the width W of the dielectric layer is obtained.
/ W) is set to a predetermined value within the range of 0.1 or more and 0.4 or less, the upper and lower dielectric layers can be directly formed in the area of the internal electrode piece and in the width direction without interposing the internal electrode piece. Since a sufficient adhesion ratio can be obtained, the occurrence of structural defects such as cracks and delamination can be prevented.

According to claim 11, in addition to the above effects, the ratio (L1 / L) of the length L1 of the internal electrode piece to the length L of the dielectric layer is 0.5 or more and 0.9 or more. Since it is set to a predetermined value within the following range, the area of the internal electrode piece and the ratio in which the upper and lower dielectric layers directly adhere to each other in the length direction without interposing the internal electrode piece can be obtained sufficiently. It is possible to prevent the occurrence of structural defects such as cracks and delamination.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a multilayer capacitor according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a conventional multilayer capacitor.

FIG. 3 is a cross-sectional plan view showing a conventional multilayer capacitor.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a plan sectional view showing a multilayer capacitor of a first embodiment of the present invention.

6 is a sectional view taken along the line BB in FIG.

FIG. 7 is a vertical sectional view of a multilayer capacitor according to a second embodiment of the present invention.

FIG. 8 is a vertical sectional view of a multilayer capacitor according to a third embodiment of the present invention.

FIG. 9 is a diagram showing a shape of an internal electrode piece according to another embodiment of the present invention.

FIG. 10 is a view showing a shape of an internal electrode piece according to another embodiment of the present invention.

FIG. 11 is a view showing a shape of an internal electrode piece according to another embodiment of the present invention.

FIG. 12 is a diagram showing a shape of an internal electrode piece according to another embodiment of the present invention.

FIG. 13 is a view showing a shape of an internal electrode piece according to another embodiment of the present invention.

FIG. 14 is a diagram showing a shape of an internal electrode piece according to another embodiment of the present invention.

FIG. 15 is a view showing the shape of an internal electrode piece according to another embodiment of the present invention.

FIG. 16 is a diagram showing a shape of an internal electrode piece according to another embodiment of the present invention.

FIG. 17 is a diagram showing the shape of internal electrode pieces in another embodiment of the present invention.

[Explanation of symbols]

20 ... Multilayer capacitor, 21 ... Dielectric layer, 22 ... Internal electrode, 22a ... Slit, 22b ... Internal electrode piece, 22c ...
Internal electrode lead-out portion, 23 ... Element body, 24 ... External electrode, 25 ...
Internal electrode formation area.

Claims (11)

[Claims] 1. A rectangular parallelepiped element body in which dielectric layers and internal electrode layers are alternately laminated, and internal electrodes formed on the internal electrode layers at both ends of the element body are alternately connected in parallel. And a pair of external electrodes, the internal electrode having two internal electrode pieces formed in the same layer and extending substantially in parallel with each other at a predetermined interval. Of the width D of the dielectric layer to the width W of the dielectric layer (D
/ W) is set to a predetermined value within the range of 0.1 or more and 0.4 or less. 2. A rectangular parallelepiped element body in which dielectric layers and internal electrode layers are alternately laminated, and internal electrodes formed on the internal electrode layers at both ends of the element body are alternately connected in parallel. And a pair of external electrodes, the internal electrode having two internal electrode pieces formed in the same layer and extending substantially in parallel with each other at a predetermined interval. The multilayer capacitor, wherein the ratio (L1 / L) between the length L1 of the dielectric layer and the length L of the dielectric layer is set to a predetermined value within the range of 0.5 or more and 0.9 or less. 3. A rectangular parallelepiped shaped element body in which dielectric layers and internal electrode layers are alternately laminated, and internal electrodes formed in the internal electrode layers at both ends of the element body are alternately connected in parallel. And a pair of external electrodes, the internal electrode having two internal electrode pieces formed in the same layer and extending substantially in parallel with each other at a predetermined interval. Of the width D of the dielectric layer to the width W of the dielectric layer (D
/ W) is set to a predetermined value within the range of 0.1 or more and 0.4 or less, and the ratio (L1 / L) between the length L1 of the internal electrode piece and the length L of the dielectric layer is A multilayer capacitor, which is set to a predetermined value within a range of 0.5 or more and 0.9 or less. 4. A rectangular parallelepiped element body in which dielectric layers and internal electrode layers are alternately laminated and internal electrodes formed on the internal electrode layers at both ends of the element body are alternately connected in parallel. And a pair of external electrodes, the internal electrode having two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. In the cross section that intersects at right angles to the axis connecting
The ratio (T1 / T) of the length T in the vertical direction of the cross section to the distance T1 from the peripheral edge of the formation region of the internal electrode in the cross section to the outer side of the cross section extending parallel to the internal electrode surface is
The ratio (W) of the lateral length W of the cross section and the distance W1 from the peripheral edge of the formation region of the internal electrode in the cross section to the outer side of the cross section extending in the direction perpendicular to the internal electrode surface.
1 / W) and the ratio (T1 / T, W1 / W) of these is 0.15 or more and 0.1.
A multilayer capacitor, which is set to a predetermined value within a range of 4 or less. 5. A rectangular parallelepiped shaped element body in which dielectric layers and internal electrode layers are alternately laminated, and internal electrodes formed on the internal electrode layers at both ends of the element body are alternately connected in parallel. And a pair of external electrodes, the internal electrode having two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. The ratio (T2 / T) of the vertical length T of the cross section that intersects at right angles to the axis connecting the two and the vertical length T2 of the internal electrode formation region in the cross section is 0.2 or more and 0.7.
A multilayer capacitor, which is set to a predetermined value within the following range. 6. A rectangular parallelepiped element body in which dielectric layers and internal electrode layers are alternately laminated and internal electrodes formed on the internal electrode layers at both ends of the element body are alternately connected in parallel. And a pair of external electrodes, the internal electrode having two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. The ratio (T3 / T2) of the longitudinal length T2 of the internal electrode forming region and the thickness T3 of the internal electrode piece in the cross section intersecting at right angles to the axis connecting the lines is 0.004 or more and 0.1 or less. The multilayer capacitor is characterized in that it is set to a predetermined value. 7. A rectangular parallelepiped element body in which dielectric layers and internal electrode layers are alternately laminated and internal electrodes formed on the internal electrode layers at both ends of the element body are alternately connected in parallel. And a pair of external electrodes, the internal electrode having two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. In the cross section that intersects at right angles to the axis connecting
The ratio (T1 / T) of the length T in the vertical direction of the cross section to the distance T1 from the peripheral edge of the formation region of the internal electrode in the cross section to the outer side of the cross section extending parallel to the internal electrode surface is
The ratio (W) of the lateral length W of the cross section and the distance W1 from the peripheral edge of the formation region of the internal electrode in the cross section to the outer side of the cross section extending in the direction perpendicular to the internal electrode surface.
1 / W) and the ratio (T1 / T, W1 / W) of these is 0.15 or more and 0.1.
It is set to a predetermined value within the range of 4 or less, and the length T in the vertical direction of a cross section intersecting at right angles with the axis connecting the external electrodes at both ends, and the length in the vertical direction of the formation region of the internal electrode in the cross section Ratio with T2 (T2 / T) is 0.2 or more and 0.7
A multilayer capacitor, which is set to a predetermined value within the following range. 8. A rectangular parallelepiped element body in which dielectric layers and internal electrode layers are alternately laminated, and internal electrodes formed on the internal electrode layers at both ends of the element body are alternately connected in parallel. And a pair of external electrodes, the internal electrode having two internal electrode pieces formed in the same layer and extending substantially in parallel at a predetermined interval. In the cross section that intersects at right angles to the axis connecting
The ratio (T1 / T) of the length T in the vertical direction of the cross section to the distance T1 from the peripheral edge of the formation region of the internal electrode in the cross section to the outer side of the cross section extending parallel to the internal electrode surface is
The ratio (W) of the lateral length W of the cross section and the distance W1 from the peripheral edge of the formation region of the internal electrode in the cross section to the outer side of the cross section extending in the direction perpendicular to the internal electrode surface.
1 / W) and the ratio (T1 / T, W1 / W) of these is 0.15 or more and 0.1.
It is set to a predetermined value within the range of 4 or less, and the length T2 in the vertical direction of the formation region of the internal electrode and the thickness T3 of the internal electrode piece in the cross section perpendicular to the axis connecting the external electrodes at both ends. A multilayer capacitor having a ratio (T3 / T2) to a predetermined value within a range of 0.004 or more and 0.1 or less. 9. A ratio (T2 / T) of a vertical length T of a cross section perpendicular to an axis connecting the external electrodes at both ends and a vertical length T2 of a region where the internal electrode is formed in the cross section. )
9. The multilayer capacitor according to claim 8, wherein is set to a predetermined value within the range of 0.2 or more and 0.7 or less. 10. The ratio (D / W) of the width D of the internal electrode piece to the width W of the dielectric layer is set to a predetermined value within a range of 0.1 or more and 0.4 or less. Claim 4 characterized by the above-mentioned.
10. The multilayer capacitor according to any one of 9 to 9. 11. A ratio (L1 / L) between the length L1 of the internal electrode piece and the length L of the dielectric layer is set to a predetermined value within a range of 0.5 or more and 0.9 or less. The multilayer capacitor according to any one of claims 4 to 10, characterized in that.