DE7336471U - Ceramic single layer capacitor for use in hybrid circuits - Google Patents

Description

Dipl.-Ing. Rudolf rink ¹ ::,; :;,, 8671. Schönwald, June 10, 1974 Ü671 Schönv.-ald '^; · ':': "."

Marienstrasse 12r.

KERAMISC! IER EIMSCÜICHT CONDENSER FOR THE USE IN HYBRID CIRCUITS

The innovation concerns a ceramic single-layer capacitor rectangular, square, circular, conical or other base shape with parallel on the two opposite main surfaces located metallized surfaces that serve as capacitor electrodes.

Such ceramic plate capacitors without wire connections and without a casing are preferred everywhere used in hybrid circuits where minimal installation heights are important.

In the previously known embodiments of such ceramic Plate capacitors it is necessary to ' from the substrate surface remote electrode coating by means of a wire bridge with the second line of the to connect printed circuit. This wire connection is carried out, for example, by soldering an iron.

In addition to the application-related disadvantage, in addition to the immersion or. Hot air soldering to connect one electrode surface With this wire connection, it is also necessary to solder the iron with one cable run also increases the inductance of the capacitor, so that such known capacitors for high frequency applications are hardly suitable.

The innovation is based on the task of making an inexpensive ceramic Eir.schichtkor.densator available to ask, lying in hybrid circuits, for example

soldered in by immersion, surge bath or hot air soldering can be, without another connecting aid, such as a wire bridge.

This object is achieved according to the innovation in that the metallized Filichen extend to the edge of the main surfaces and on each main surface at least one creepage distance strip runs from one edge to the other, which divides the metallized main surface into at least two partial areas _v such that the creepage distance strips on the opposite main surfaces cross at any angle and each sub-area of the one main area is electrically conductively connected to a sub-area located on the opposite main area via the secondary area.

The creepage distance strips can run in a straight line or S-shaped if the main area is to be achieved higher capacity values should be better utilized.

It is also possible to use the modern single-layer capacitor to make matchable. There is a creepage distance strip on one main surface, which runs in a straight line, for example; on the opposite main surface there are several creeping " stretch strips that diverge from one point in a radial fashion and divide the main area into equally large areas and / or subdivide unequal sized surface segments, the two partial surfaces of the one main surface with each one segment of the other main surface electrically are conductively connected. For example, brush metallization can make individual segments electrically conductive are connected to each other so that the capacitance value of the capacitor changes.

In addition, it is also possible to provide the main surfaces with electrode surfaces in such a way that the edges of the creepage distance are.

The advantages achieved with the innovation consist in particular in having a capacitor available, which uses most of its main surfaces as electrode surfaces, with both electrodes on each main surface are present in such a surface area that there are no problems with these electrodes to be connected to the cable runs of a hybrid circuit in a secure manner.

Another advantage is that it can be adjusted easily, even after such capacitors have been installed can be carried out in hybrid circuits in which, for example, with a conductive at room temperature conductive silver, individual creepage distances are bridged in a conductive manner.

An embodiment of the innovation is in the drawing and is described in more detail below.

Show it:

1 shows a three-dimensional representation of a "capacitor according to the innovation,

Fig. 2 is a plan view of a capacitor according to the innovation,

3 shows a plan view of a capacitor according to the invention with a plurality of electrode segment surfaces and

4 shows a section from a hybrid circuit with two modern capacitors.

In Fig. 1 is a ceramic, plate-shaped dielectric body 1 shown with electrode surfaces, the electrode surfaces 2 being separated from one another by creepage strips 5 are separated. The electrode surfaces are over the secondary surfaces 4 2 connected by means of metallizations 3 in such a way that

733147112.9.74

that the electrode areas 2. of different potentials come to lie one on top of the other.

Fig. 2 shows a plan view of a novel condenser with the electrode surfaces 2 separated from one another by the creepage distance strip 5, the creepage distance strip Cross en in the imaginary projection at any angle. The metallizations 3 on the Secondary surfaces 4 connect the electrode surfaces 2 of the two main surfaces to one another.

3 shows a capacitor according to the invention which is divided into two electrode surfaces 2 on one main surface by a creepage distance strip 5 and on the other main surface by several radial creepage distance strips 5 in electrode segments 2 ¹ , 2 · ¹ , 2 ^{1 '·.} The metallizations 3 on the secondary surfaces 4 connect the electrode surfaces 2 on one main surface with electrode segments on the other main surface. Cable bridges 6 optionally connect the electrode segments 2 'with 2 · ¹ or 2''with2''etc.

4 shows a section from a hybrid circuit. On a substrate 7 there are cable runs. The capacitors 1 with their partial surfaces 2 are on the Cable runs flat on and can thus be soldered directly into the circuit, advantageously on a very precise positioning of the capacitors according to the invention in the circuit can be dispensed with, since the entire Partial areas are available for contacting. The capacitor shown in * figure on the right is So inserted into the circuit that the metallizations are in the direction of the cable run, se that during the soldering process the Due to its surface tension, solder also to the Metallizations 3 pulls up.

S CHU * .t "Z Λ N S P R Ü C H E * the

733847112.1.74

Claims (5)

PROTECTION CLAIMS: 1. Ceramic single-layer capacitor rectangular, square, circular, conical or other base shape with metallized surfaces located on the two parallel opposite main surfaces, characterized in that the metallized surfaces extend to the edge of the main surfaces and on each main surface at least one creepage distance strip from one edge to the another, which divides the metallized main surface into at least two sub-areas in such a way that the creepage distance strips on opposite main surfaces cross at any angle and each sub-surface of one main surface is electrically conductively connected to a sub-surface on the opposite main surface via the secondary surface. 2, ceramic single layer capacitor according to claim 1, characterized in that the creepage distance strips run in a straight line and the crossing angle is small, so that in the imaginary pro '' jection of the two main surfaces creates four segments, of which two opposite segments are very narrow and the other two are opposite Segments are very wide and the partial surfaces on the secondary surface edges of the very narrow segments are electrically connected. 73384711 *. ·. « - 2 - if 3. Ceramic single layer capacitor according to claim 1, characterized in that the creepage distances S-shaped and the crossing angle is small or almost zero. 4. Ceramic single-layer capacitor according to claim 1, characterized in that on one main surface a creepage distance strip runs and on the opposite one Main surface several creepage strips radiate apart from one point * 5. Ceramic single-layer capacitor according to claim 4, characterized in that the two partial surfaces the one main area with one segment each of the other main area is electrically conductive via the secondary area connected is. 738847112.9.74