WO2012126776A1

WO2012126776A1 - Electrical multi-layered component

Info

Publication number: WO2012126776A1
Application number: PCT/EP2012/054393
Authority: WO
Inventors: Johann Schmidt
Original assignee: Epcos Ag
Priority date: 2011-03-24
Filing date: 2012-03-13
Publication date: 2012-09-27
Also published as: DE102011014967B4; TW201250723A; DE102011014967A1; TWI562174B

Abstract

The invention relates to an electrical multi-layered component (1) which has a stack (8), with a stack-length B, that comprises functional layers (2) and at least one first and one second inner electrode (5, 6). The first and second inner electrodes (5, 6) are each directly connected, in an electrically conductive manner, to an outer contact on a side face (91, 92) of the stack (8) and have, in the direction from the first to the second inner electrode and perpendicular to the layer stack direction (S), the same electrode length E. The first inner electrode (5) has a distance H to the second inner electrode (6) in the layer stack direction. Moreover, the first and second inner electrodes (5, 6) are directly adjacent to one another. The distance H, the stack-length B and the electrode length E define an aspect ratio of a = H/B and a relative electrode length I = E/B, wherein a_min≤a≤a _max applies with a_min = 20.e ^-11.I and a_max = 150.e ^-9.I.

Description

description

Electrical multilayer component

An electrical multilayer component with a stack of functional layers and internal electrodes arranged between them is specified. For electrical contacting of the internal electrodes external contacts may be attached to the side surfaces of the stack. Such an electrical multilayer component can be designed, for example, as a multilayer resistance component, as a multilayer varistor or as a multilayer capacitor.

It is a task to be solved by certain

Embodiments, a geometry of an electric

Multi-layer component, in particular an interior and

External electrode arrangement of an electrical

Multi-layer component to specify, which has improved properties compared to known multilayer devices.

This object is solved by the subject matters of the independent claims. Advantageous embodiments and further developments of the objects continue to be apparent from the following description and the drawings.

The electrical properties of multilayer components are, in addition to several other factors in particular also dependent on the geometric arrangement of the internal electrodes. The thickness of the functional layers of a multilayer ^component , such as the thickness of the dielectric

Layers in a multilayer capacitor, can

usually due to production only very poorly constant being held. However, the variations in thickness of the functional layers affect the electrical values of the multilayer component, such as the capacitance of a multilayer capacitor or the resistance of a multilayer resistor component, such as a PTC or NTC device. In order to prevent in known manufacturing processes, that the electrical values of multilayer components by the production-related thickness variations of the functional layers do not deviate too much from a predetermined setpoint, that is, to avoid correspondingly wide tolerance bands, for example, films that later the functional layers of the make finished component, preselected. Alternatively, in known manufacturing processes, a subsequent

Selection of the finished components, wherein components whose electrical properties differ too much from the specified setpoints, are sorted out. Furthermore, in the case of known production methods, the electrical values of a component can also be subsequently adjusted by a so-called adjustment, for example by removing parts of the multilayer component by path grinding or trimming. A combination of the abovementioned possibilities of eliminating or at least reducing the disadvantages associated with the production-related thickness fluctuations of the functional layers is also customary for known production methods.

The inventors have found that the electrical values of a multilayer component, such as the resistance and / or the capacity of a Vielschichtbauele ^¬ ments, by a described herein inner electrode arrangement largely independent of thickness variations of the

functional layers can be made. According to one embodiment, the multilayer electrical component has a stack with functional layers and at least one first and one second inner electrode. The functional layers can be dielectric

Be layers or electrically conductive layers, depending on whether the electrical multilayer component as

Capacitor, designed as a varistor or as a thermistor. By their respective characteristics determine the

functional layers the functioning of the device. For example, the functional layers

Be plastic layers or ceramic layers.

To produce the multilayer component, the

functional layers stacked, resulting in a stacking direction. Through the interfaces

adjacent functional layers, layer planes of the multilayer component are determined along the

Stacking direction of the functional layers are arranged one above the other. The internal electrodes are in such

Layer planes arranged.

According to another embodiment, the first one is

Inner electrode having a first outer contact, which is arranged on a side surface of the stack, directly electrically conductively connected. The second inner electrode is directly electrically conductive with a second outer contact, which is also arranged on a side surface of the stack

connected. Preferably, the external contacts to the

Contacting the internal electrodes serve, arranged on side surfaces of the stack. For example, the

External contacts on opposite side surfaces of the stack or on different areas of a

Side surface of the stack to be arranged. "Direct electric means "connected here" means here and below that an inner electrode adjacent to an external contact and thus is directly connected to the external contact

External contact arranged on a side surface of the stack, so extends an electrically connected directly to the external contact inner electrode up to this side surface.

According to another embodiment, the first and second inner electrodes have the same electrode length E. In this case, electrode length E denotes the lateral extent of the first or the second inner electrode perpendicular to the layer stacking direction of the stack in the direction from the first to the second inner electrode.

Furthermore, the first inner electrode to the second

Inner electrode in the layer stacking direction on a distance H. This may mean, in particular, that the first and the second inner electrodes are arranged in two different layer planes perpendicular to the layer stacking direction of the stack, wherein the two layer planes are at a distance H from each other

exhibit. Preferably, between the first and the second inner electrode exactly one functional layer

be present, which has the thickness H, or there may be a plurality of functional layers, the one

Total thickness H have. Furthermore, the first and second inner electrodes are directly adjacent to each other. In other words, the functional layer or the plurality of functional layers disposed between the first and second inner electrodes and directly adjacent to the first and second inner electrodes is free of others

Internal electrodes. Directly adjacent to each other

Internal electrodes are also referred to as closest to one another in the following. According to another embodiment, the stack has a stack length B in the direction from the first to the second inner electrode perpendicular to the layer stacking direction. With

Stapling length B is here the spatial extent of the stack perpendicular to the stacking direction of the stack and in

Direction from the first to the second inner electrode

designated, wherein the staple length B is preferably limited by two opposite side surfaces of the stack.

The distance H, the staple length B and the electrode length E define an aspect ratio a = - and a relative

, E

Electrode length ß _' Here, the aspect ratio a of a minimum aspect ratio and a maximum

Limited aspect ratio, so <a <, where

« _Min = 20-e- ¹¹ - ^/ and a _msx = \ 50-e- ^9! is.

It has been found that the resistance and / or the capacitance of a multilayer component in which the above-defined aspect ratio a is between the minimum

Aspect ratio = 20 · e ^{~ '1} and the maximum

Aspect ratio = 150 · e ^{~ 9!} lies, with advantage

Largely independent of thickness variations of

functional layers is. This advantage can in particular by a suitable choice of the parameters H, B and E of the

Multilayer component can be achieved.

According to another embodiment, the first one is

Inner electrode overlapping free of the second

Internal electrode arranged. The first inner electrode thus has no subregion, which in a mental Projection in layer stacking direction covers a portion of the second inner electrode.

According to another embodiment, the first inner electrode partially overlaps with the second inner electrode. In other words, the first inner electrode has at least one partial region, which can be brought into coincidence with at least one partial region of the second inner electrode in the case of a mental projection in the layer stacking direction.

According to another disclosed embodiment, the

Multi-layer component at least one further first and / or second inner electrode. The at least one further first and / or second inner electrode has the electrode length E in this case. With electrode length E, the spatial extent of an inner electrode in the direction from the first to the second inner electrode is again perpendicular to

Layer stacking direction called. Furthermore, the first and second internal electrodes of the device are in

Layer stacking direction arranged alternately. each

Inner electrode has a distance H in each case to an ^inner electrode closest to the layer ^stacking direction

Layer stacking direction on. In particular, each first inner electrode has to each its directly adjacent second

Inner electrode, as well as every other inner electrode to each their directly adjacent first inner electrode, a distance H in the layer stacking direction.

According to a further embodiment, all internal electrodes of the component are in different functional

Layers arranged. This may mean in particular that the stack is not a layer plane perpendicular to Layer stacking direction, in which two or more

Internal electrodes are arranged.

According to a further disclosed embodiment, all internal electrodes of the multilayer component have the same

Electrode width on. In this case, with the electrode width, the lateral extent of the internal electrodes perpendicular to

Electrode length E designated. According to another

In the form of a guide, all internal electrodes have the same electrode surface.

According to a further embodiment, the multilayer component has a stack with functional layers and at least two free internal electrodes as well as a first and a second external contact. The free internal electrodes are not directly electrically conductively connected to either the first or the second external contact, which are arranged on side surfaces of the stack. The free internal electrodes thus do not extend as far as the external contacts, but are arranged along their plane of extent adjacent to the external contacts in the interior of the stack. Each free inner electrode of the multilayer component has a same electrode length 2E.

According to another embodiment, each one is free

Inner electrode to each in the layer stacking direction

closest free inner electrode on a distance H in the layer stacking direction.

Furthermore, each free inner electrode has one

Focus on. The center of a free inner electrode lies in the layer plane of the inner electrode and in a mental reflection at the center would be the Internal electrode transferred to itself. Furthermore, each free inner electrode could be mentally divided into two equal parts of equal area and length E by means of a line, this line passing through the center of the free inner electrode.

According to one embodiment, the distance is

respective center points of two directly ^inner electrodes, which are directly adjacent in the layer ^stacking direction, perpendicular to the layer ^stacking direction B '.

According to another embodiment, the distance H, the distance B 'and the electrode length E define a

Aspect ratio a = - and a relative electrode length

ff

i e

1 = -, where the aspect ratio a is between a minimum ff

Aspect ratio and maximum aspect ratio

«Ma _x üegt, that is, <or <, where a _mn = 20 · e ^{'11 1} and

« _■ na _x = 150-e- ^{9 '/} is.

According to another embodiment, the multilayer electrical component has at least one further inner electrode, which is directly electrically conductively connected to the first or the second external contact. In this case, the further inner electrode preferably has a distance H in the layer ^stacking direction for each free inner electrode closest to the layer ^stacking direction.

According to one disclosed embodiment, the electrical

Multilayer device on two further internal electrodes, wherein one of the two further internal electrodes with the first

External contact is electrically connected directly and the another of the two further internal electrodes is directly electrically conductively connected to the second external contact.

According to another disclosed embodiment, each further

Inner electrode has a length F in the direction of the electrode length E perpendicular to the layer stacking direction. Preferably, F> E.

According to a further embodiment, the multilayer electrical component has a stack with functional layers and a first inner electrode connected to a first

External contact on a side surface of the stack directly

is electrically connected, a second inner electrode, with a second external contact on a

Side surface of the stack is electrically connected directly, and a free inner electrode, which are connected directly to the first and the second external contact directly electrically conductive on. According to one embodiment, the first inner electrode and the second inner electrode each have an electrode length E. Preferably, the free inner electrode has a

Electrode length 2E on. According to a further disclosed embodiment, the free

Inner electrode to both the first and the second

Inner electrode on a distance H in the layer stacking direction. By way of example, the first and the second inner electrodes can be applied to the same functional layer of the stack and thus be arranged in the same plane or layer plane. Alternatively, however, the first and the second inner electrode can also be arranged in different planes, each one to the free inner electrode Have distance H in the layer stacking direction. The free

Inner electrode may be arranged centrally in the stack, that is, it has in each case an equal distance to opposite side surfaces of the stack.

Furthermore, the free inner electrode has a center, wherein the distance of the center of the free

Internal electrode perpendicular to the stacking direction

Side surfaces of the stack at which the external contacts make contact with the first and second internal electrodes are each B ".

By the distance H, the distance B '' and the electrode length

E becomes an aspect ratio a = - and a relative

B "

i e

Electrode length ß ^ defined, wherein the aspect ratio a is between a minimum aspect ratio and a maximum aspect ratio, so <a <is with a _mn = 20-e- ⁱ and = 150 · e ^{'9 1} .

According to a further disclosed embodiment, the electrical multilayer component has a resistor and / or a

Capacity that are substantially insensitive to thickness variations of the functional layers. By means of the internal electrode arrangements described here, negative effects of manufacturing-related layer thickness fluctuations of the functional layers can be reduced. So, in comparison to known devices, here

described components even with thickness variations of the functional layers from component to component a substantially same predetermined set resistance and / or a predetermined capacity can be achieved with these components.

According to a further disclosed embodiment, the electrical multilayer component is constructed axially symmetrical.

For example, the multilayer component

be axisymmetric to one or more spatial axes. According to a further disclosed embodiment, the electrical multilayer component is constructed point-symmetrical.

Preferably, the device is point symmetrical with respect to a center of the device, each to

opposite side surfaces of the device has an equal distance.

According to a further disclosed embodiment, the electrical multilayer component is designed as a thermistor device. This may be, for example, an NTC thermistor or a PTC thermistor.

According to a further disclosed embodiment, the electrical multilayer component is designed as a varistor.

According to a further disclosed embodiment, the electrical multilayer component is designed as a capacitor.

Further advantages and advantageous embodiments of the multilayer electrical component are evident from the embodiments described below in connection with FIGS. 1 to 8.

Show it FIGS. 1 to 5 cross sections of various embodiments of multilayer components described here;

Figure 6 is a diagram illustrating the resistor described herein

Represents components as a function of the aspect ratio,

FIG. 7 is a graph showing the aspect ratio a in FIG

Dependence of the relative electrode length 1 represents.

FIG. 8 shows a diagram which shows the resistance or the capacitance of a multilayer component in FIG

Dependency of the thickness of the functional layers represents.

In the exemplary embodiments and figures, the same or equivalent components may each have the same

Be provided with reference numerals. The illustrated elements and their proportions with each other are basically not to be regarded as true to scale, but rather individual elements, such as layers, components and areas for better representability and / or better

Understanding exaggeratedly thick or large dimensions

be shown.

Figure 1 shows a cross section of an electrical

Multilayer device 1 according to an embodiment, which has a stack 8 with functional layers 2, which are arranged one above the other in a stacking direction S. Furthermore, the multilayer component 1 has a first one

Internal electrodes 5 and a second inner electrode 6, which are arranged in layer planes of the multilayer component 1 are, wherein the layer planes are determined by the interfaces of adjacent functional layers 2. By sintering, for example, a monolithic body as shown in FIG. 1 is formed in which the

functional layers 2 and the internal electrodes 5, 6

are interconnected so that interfaces between directly adjacent functional layers 2 are no longer recognizable.

On two side surfaces 91, 92 of the stack 8 are two

External contacts 3, 4 arranged. The side surfaces 91, 92 are, as shown in Figure 1, opposite side surfaces.

Alternatively, the side surfaces may, for example, be adjoining side surfaces of the stack 8. The outer contacts 3, 4 cover in the embodiment shown in each case an entire side surface 91, 92 of the stack eighth

Alternatively, the external contacts 3, 4 also

Cover portions of the side surfaces of the stack 8 or be designed as a cap-shaped outer contacts, which are arranged across edges on several side surfaces of the stack 8. Such cap-shaped external contacts are, for example, by immersing the stack 8 in a

conductive paste can be produced. Furthermore, the multilayer component 1 has a first internal electrode 5, which is directly electrically conductively connected to the first external contact 3, and a second internal electrode 5

Inner electrode 6, which is directly electrically conductively connected to the second external contact 4, on. The first and second inner electrodes 5, 6 both have a same electrode length E. Furthermore, the first inner electrode 5 to the second inner electrode 6 in the layer stacking direction at a distance H. The first inner electrode 5 and the second inner electrode 6 are directly adjacent to each other. This means in particular that the functional layer 2 or alternatively also the plurality of functional layers 2, which is arranged between the first and second inner electrode 5, 6, and in direct contact with the first and second

Inner electrode 5, 6 is free of further internal electrodes. The stack 8 has a stack length B in the direction from the first to the second inner electrode perpendicular to the layer stacking direction.

The distance H, the staple length B and the electrode length E

H

define an aspect ratio ^{a =} ~ ^ ~ ^unc ^ a relative electrode ^length / = -, where a ^ <a <a with a _mm = 20 - e ^{~ i}

B

and = 150 - _e - ^{9 '/}

FIG. 8 shows a diagram which qualitatively shows the electrical conductance 1 / R or the capacitance C of such a multilayer component as a function of the layer thickness d of the functional layers. In this case, the curve A corresponds to the typical conductance relationship or capacitance ^profile in known multilayer components whose internal electrodes are arranged in the so-called gap design 501, that is to say their internal electrodes

overlap-free and with a gap, so a Gap, are arranged. In such a "gap design" forms an electric field or a current flow in

Substantially parallel to the internal electrodes and the capacitance or the resistance of such devices increases in approximately proportional to the layer thickness. Curve B shows the typical conductance or capacitance profile of known multilayer components whose internal electrodes are arranged in a so-called "overlap design" 502 or "T-design" 503. In the overlap design, alternating inner electrodes alternately overlap in the layer stacking direction. An electric field or current flow is formed in the overlapping design substantially in the stacking direction, that is, perpendicular to the internal electrodes. The T design essentially represents a series connection of two overlap designs. The capacitance or the conductance of such components decreases approximately indirectly proportionally with increasing layer thickness.

In the known device designs affect

Layer thickness variations thus directly on the electrical values, whereby process-related layer thickness variations lead to components with different electrical values.

In the multilayer devices described here, a superposition of the aforementioned effects of the known

Components can be achieved, as shown in Figure 8 based on the curve Z. Due to the special internal electrode arrangement, the respective dependencies of the electrical values described in connection with the curves A and B are superimposed on the layer thickness of the functional layers. It will be appreciated that the curve Z has an approximately planar course in a region indicated by the two dashed vertical lines 98, 99. This means that the resistance or the capacitance of the multilayer components described here in this

Area almost independent of production-related

Thickness variations of the functional layers is what especially with respect to the above-mentioned range for the aspect ratio a.

FIG. 6 shows a diagram in which the resistance R of a component for different relative electrode lengths / depending on the aspect ratio a is shown. The various resistance curves each have a more or less wide flat area. In this area, the device is relatively insensitive to

Thickness variations of the functional layers, that is, in this area, the resistance of the device changes only slightly with varying thickness of the functional layers.

In Figure 7, the width of this area is shown, wherein the aspect ratio a as a function of the relative

Electrode length 1 is shown. Mathematically, the

Curves through the relationships given above

and = 150 · e ^{~ 9!} to be discribed.

The multilayer component 1 shown in FIG. 1 shows the multilayer component described here in its simplest form, so to speak as a type of basic element. All other components shown below build on this simplest form and are formed by an array of basic elements.

FIG. 2 shows a cross-section of a multilayer component 1 according to a further exemplary embodiment, in which

Compared to the multilayer component shown in FIG. 1, further first and second internal electrodes 5, 6 are present. The multilayer component 1 thus has a plurality of first internal electrodes 5 and a plurality of second internal electrodes 6. The first and second Internal electrodes 5, 6 all have a same electrode length E. All first internal electrodes are arranged congruently one above the other in the layer ^stacking direction, ie they have no offset to one another in the layer plane. Likewise, all second internal electrodes are arranged congruently one above the other.

Furthermore, each inner electrode in each case to an in

Layer stacking direction S closest inner electrode a distance H in the layer stacking direction S. In FIG. 2, the first inner electrodes 5 are arranged without overlapping of the second inner electrodes 6. Alternatively, the first internal electrodes may also be connected to the second internal electrodes

overlap.

The first and second internal electrodes 5, 6 are all arranged in different layers 2 of the stack 8. Of

Furthermore, all first and all second internal electrodes 5, 6 have a same electrode width. In particular, all internal electrodes have an equal area. The multilayer component shown in FIG. 2 is replaced by a multiple arrangement or repetition of the component from FIG. 1 in the vertical direction, that is to say in FIG

Layer stacking direction S, formed.

Figure 3 shows a cross section of an electrical

Multilayer component 1 with a first inner electrode 5, which is connected directly electrically conductively connected to a first outer contact 3 and with a second inner electrode 6, which is directly electrically conductively connected to a second outer contact 4. Furthermore, the electrical multilayer ^¬ component 1 has a free inner electrode 7, which neither with the first external contact 3 nor with the second external contact. 4 is electrically connected directly. The free inner electrode 7 has a length 2E. The first and second inner electrodes 5, 6 each have one

Electrode length E on. The first inner electrode 5 and the second inner electrode 6 are arranged in a same layer of the stack 8.

The free inner electrode 7 has both the first

Inner electrode 5 and the second inner electrode 6 in the layer stacking direction S a distance H. The distance of the midpoint M of the free inner electrode 7 to the side surface 91 of the stack 8, at which the first outer contact 3 directly contacts the first inner electrode 5, and to the side surface 92 of the stack 8, where the second outer contact 4 directly contacts the second inner electrode 6, is each B ". Here define the distance H, the distance B '' and the

Electrode length E an aspect ratio a = and a relative electrode length, where again <a <

applies with a _mn = 20-e ⁿⁱ and a_ = 150 × e ^'91

The multilayer component 1 shown in FIG. 3 is replaced by a double repetition or series connection of the internal electrode arrangement of the component from FIG. 1 in the horizontal direction, that is to say perpendicular to FIG

Layer stacking direction S in the direction of the first

Inner electrode to the second inner electrode formed.

FIG. 4 shows an electrical multilayer component 1 according to a further exemplary embodiment, which has a first internal electrode 5 which is directly electrically conductively connected to a first external contact 3 Inner electrode 6, which is directly electrically conductively connected to a second external contact 4, and two free

Internal electrodes 7, which are connected to the first and the second external contact 3, 4 directly electrically conductively, having. The two free inner electrodes 7 each have a same electrode length 2E and a center M, wherein the distance between the respective centers M of the two adjacent in the layer stacking direction free

Internal electrodes perpendicular to the layer stacking direction S is B '. The two free inner electrodes 7 furthermore have a distance H from one another in the direction of the stacking direction S.

The first and the second inner electrode 5, 6 each have a distance H in the layer stacking direction S relative to the free inner electrode lying closest in the layer stacking direction S. The first inner electrode 5 and the second inner electrode 6 also each have a length F in the direction of

Electrode length E perpendicular to the layer stacking direction S on, which is greater than or equal to E.

For the distance H, the distance B 'and the electrode length E an aspect ratio a = - and a relative

, E

Electrode length / = - apply, the aspect ratio a is between a minimum aspect ratio and a maximum aspect ratio, so <a <applies, where a _mi = 20 - e ^{~ U!} and a _mm = 150 · e ^{~ 9 '1} .

The component 1 shown in FIG. 4 can theoretically be replaced by a multiple horizontal arrangement or

Series circuit of basic elements of Figure 1 are formed. FIG. 5 shows an electrical multilayer component 1 according to a further exemplary embodiment, which has a multiplicity of free internal electrodes 7. In particular, the multilayer component 1 has a plurality of free ones

Internal electrodes 7, which are in a same layer plane

are arranged, as well as a plurality of free

Internal electrodes 7, which are arranged one above the other in the layer stacking direction S on, with all free

Internal electrodes have an equal electrode length 2E. The free internal electrodes 7, which are arranged one above the other in the layer stacking direction S, are arranged congruently one above the other, i. they have no offset to each other in the direction of the layer planes. Furthermore, the multilayer electrical component 1 has a plurality of first internal electrodes 5, which are connected to a first

External contact are electrically connected directly, and a plurality of second internal electrodes 6, which are connected to a second

External contact 4 are electrically connected directly on.

Each free inner electrode 7 has a center M, wherein the respective centers M of two directly in

Layer stacking direction S adjacent to each other

closest free internal electrodes 7 perpendicular to

Layer stacking direction S the distance B 'have. Each free inner electrode 7 has a distance H in the layer stacking direction S for each free inner electrode 7 closest to the layer stacking direction S. Likewise, each first and every second inner electrode 5, 6 has a distance H in the layer stacking direction S for each free inner electrode 7 closest to the layer stacking direction S. In this case, an aspect ratio applies to the distance H, the distance B 'and the electrode length E. a = - and a relative electrode length / = -, wherein the

Aspect ratio a is between a minimum aspect ratio ^a min ^and d a maximum aspect ratio, ie

« _■ m" ^ «^« max gü, where a _mn = 20 · e ^~ and = 150 · e ^{'9 1} .

The multi-layer component 1 shown in FIG. 5 can be thought of by a repeated arrangement of basic elements from FIG. 1 in horizontal as well as vertical

Direction, so be formed by a multiple parallel and - series circuit. In the case of the components shown in FIGS. 4 and 5, the length F of the first and second internal electrodes, which is greater than or equal to E, that is to say in particular does not have to be equal to E, plays a role

subordinate role, since current paths or electric fields in areas near the external contacts 3, 4 substantially parallel to the first and second, respectively

Internal electrodes 5, 6 run.

The invention is not limited to this by the description with reference to the embodiments, but includes each new feature and any combination of features. This includes in particular any combination of features in the claims, even if this feature or these

Combination itself is not explicitly stated in the claims or exemplary embodiments. Reference sign list

1 multilayer component

2 functional layer

3 first external contact

4 second external contact

5 first inner electrode

6 second inner electrode

7 free inner electrode

8 piles

91, 92 side surface of the stack

S layer stacking direction

E, 2E, F electrode length

H distance in stack direction

B stack length

B ', B' 'Distance perpendicular to the stacking direction

M center of an inner electrode

a aspect ratio

1 relative electrode length

Claims

Patent claims

Electrical multilayer component (1), comprising a stack (8) with functional layers (2) and at least a first and a second internal electrode (5, 6), wherein

- The first internal electrode (5) with a first

External contact (3) on a side surface (91) of the stack is directly electrically connected and the second internal electrode (6) is directly connected to a second external contact (4) on a side surface (92) of the stack

is electrically connected,

- The first and second internal electrodes (5, 6) have the same electrode length E in the direction from the first to the second internal electrode (5, 6) perpendicular to

Have layer stacking direction (S),

- the first internal electrode (5) to the second

Internal electrode (6) in the layer stacking direction

has distance H,

- the first and second internal electrodes (5, 6) are directly adjacent to one another,

- The stack (8) in the direction from the first to the second internal electrode (5, 6) perpendicular to

Layer stacking direction (S) has a stacking length B, and

- the distance H, the stack length B and the electrode length E define an aspect ratio a =— and a relative electrode length / ,=— E, where

«now ^^max good with = 20 ^■ e ^{~ ' 1} and 0 = 150-e Component according to claim 1, wherein the first

Internal electrode (5) is arranged without overlap from the second internal electrode (6).

Component according to claim 1, wherein the first

Internal electrode (5) partially with the second

Internal electrode (6) overlaps.

Component according to one of the preceding claims, wherein the component (1) has at least one further first and/or second internal electrode (5, 6), wherein

- the at least one further first and/or second

Internal electrode (5, 6) has the electrode length E,

- the first and second internal electrodes (5, 6) of the component (1) are arranged alternately in the layer stacking direction (S), and

- Each internal electrode (5, 6) is one in

The inner electrode (5, 6) closest to the layer stacking direction (S) has a distance H in the layer stacking direction (S).

Component according to one of the preceding claims, comprising a plurality of first internal electrodes (5) and a plurality of second internal electrodes (6).

Component according to one of the preceding claims, wherein all internal electrodes (5, 6) in different

Layers (2) are arranged.

Component according to one of the preceding claims, wherein all internal electrodes (5, 6) have the same area. Electrical multilayer component, comprising a stack (8) with functional layers (2) and at least two free internal electrodes (7) as well as a first and a second external contact (3, 4), the

External contacts (3, 4) are arranged on side surfaces (91, 92) of the stack (8), whereby

- The free internal electrodes (7) neither with the first nor with the second external contact (3, 4) directly

are electrically connected,

- Each free internal electrode (7) is the same

Electrode length 2E,

- each free internal electrode (7) to each in

Layer stacking direction (S) closest free

Internal electrode (7) a distance H in

Layer stacking direction (S),

- Each free internal electrode (7) has a center point (M), the distance between the respective center points (M) being between two directly in the layer stacking direction (S).

adjacent free internal electrodes (7) perpendicular to the layer stacking direction (S) B ', and

- the distance H, the distance B' and the electrode length

E an aspect ratio a =— and a relative

Define electrode length ' , ⁼ ~E^,~, where < a < applies with a _mn =20-e- ⁱ and = 150 · e ^'91 .

Component according to claim 8, in which at least one further internal electrode (5, 6) is provided, which is directly electrically conductively connected to the first or second external contact (3, 4) and to each free one in the layer stacking direction (S). Internal electrode (7) a distance H in

Layer stacking direction (S).

Component according to claim 9, wherein the further

Internal electrode (5, 6) has a length F in the direction of the electrode length E perpendicular to the layer stacking direction (S), where F is E.

Component according to one of claims 8 to 10, comprising a plurality of free internal electrodes (7), which are arranged in a same layer plane, and a plurality of free internal electrodes (7), which are each arranged one above the other in the layer stacking direction (S).

Electrical multilayer component (1), having a stack (8) with functional layers

(2), a first internal electrode (5) with a first external contact

(3) is directly electrically conductively connected to a side surface (91) of the stack (8), a second

Internal electrode (6) with a second external contact

(4) is directly connected in an electrically conductive manner on a side surface (92) of the stack (8) and a free one

Internal electrode (7), which is not directly electrically connected to either the first or the second external contact (3, 4), whereby

- the first internal electrode (5) and the second

Internal electrode (6) are arranged in the same layer and each have the same electrode length E,

- the free internal electrode (7) has an electrode length 2E,

- The free internal electrode (7) is at a distance H in from the first and second internal electrodes (5, 6).

Layer stacking direction (S), - the free internal electrode (7) has a center point (M), the distance between the center point (M) of the free internal electrode (7) and the side surfaces (91, 92) of the stack (8) on which the external contacts (3, 4) are located. the first and second internal electrodes (5, 6) contact, perpendicular to the layer stacking direction (S) B'', and

- the distance H, the distance B'' and the electrode length

Define electrode length /=—-, where < a < a max applies

13. Component according to one of the preceding claims,

wherein the multilayer component (1) has a resistance and/or a capacitance, wherein the resistance and/or the capacitance of the multilayer component (1) is in

Are essentially insensitive to thickness fluctuations of the functional layers (2).

14. Component according to one of the preceding claims,

wherein the multilayer component (1) is constructed axisymmetrically and/or point-symmetrically.

15. Component according to one of the preceding claims,

wherein the multilayer component (1) is an NTC thermistor, a PTC thermistor, a varistor or a

Capacitor component is.