JPS6120739Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of CR composite parts with discharge gaps used in television antenna circuits, etc.
This product improves the characteristic defects of conventional CR composite parts with a discharge gap, such as variations in discharge starting voltage and discontinuous discharge.

Figure 1 is a schematic configuration diagram of a conventional CR composite part with a discharge gap, in which 1 is ceramic, 2,
2' is a capacitor electrode, 3 is a resistor, 4 is a discharge gap, and 5 and 5' are capacitor electrodes. This CR composite part with discharge gap is generally
It is used in antenna circuits of television tuners, etc., and is equipped with a discharge gap for lightning surge protection. However, since the discharge gap 4 is in direct contact with the surface of the ceramic 1, as shown by A in FIG. If it becomes dirty, it has the disadvantage that the discharge starting voltage varies, discontinuous discharge occurs, and the discharge characteristics deteriorate.

The present invention was made in order to eliminate the drawbacks of the prior art as described above.
One embodiment will be described in detail with reference to FIGS. In FIG. 2, 10 is a ceramic for condensing a capacitor, 11 and 11' are electrodes for the capacitor, and 12 and 12' are internal electrodes buried in the ceramic 10.
It is well known that the capacitance of a capacitor is determined by the opposing area, the spacing, and the dielectric constant of the ceramic 10. 13, 13' are ceramic 8
The discharge electrode embedded therein, 14 is a cut groove provided on the surface of the ceramic, and the cut groove 14 is
Discharge electrodes 13, 1 are provided on the opposing surfaces 14a, 14a'.
The cut surfaces 13a, 13a' of 3' are exposed so that a discharge occurs between them. 20 is ceramic for resistor printing, 21 and 21' are resistor electrodes,
Reference numeral 22 represents a resistor, and a resistor chip constituted by these 20 to 22 is attached to a capacitor with a discharge gap constituted by 10 to 14 with a conductive adhesive 3.
CR composite parts with a discharge gap are constructed by combining them together by soldering or the like. Incidentally, as shown in FIG. 3, it is also possible to directly print the resistor 22' instead of the resistor chip.

The present invention provides the above-mentioned CR composite part with a discharge gap, in particular, by providing a discharge electrode in the ceramic capacitor 8, and
A kerf 14 is provided in the kerf 0, and the surface 14 facing the kerf
Cut surfaces 13a and 13 of the discharge electrodes are shown at a and 14a'.
A' is exposed, and the cut surfaces 13a and 13a' are used as discharge electrode surfaces, and the cut groove 14 is used as a discharge gap.The manufacturing method thereof will be briefly described below.

As is well known, multilayer chip capacitors are manufactured by stacking dielectrics and internal electrodes alternately, cutting them to specified dimensions, and then attaching capacitor electrodes. To manufacture a chip capacitor with a discharge gap according to the invention, when printing the internal electrodes in the lamination process, the discharge electrodes are printed so as to short-circuit between the capacitor electrodes, and before cutting to the specified dimensions. The capacitor is manufactured by cutting a groove in the center of the capacitor. The discharge electrode is cut by this kerf, and as shown in FIG. 2, the cut surface of the discharge electrode is exposed on the opposite surface of the kerf, and this cut surface serves as the discharge electrode surface. The kerf acts as a discharge gap.

As is clear from the above description, according to the present invention, since the discharge gap is an air gap, variations in discharge starting voltage, discontinuous discharge, etc. are eliminated compared to conventional products, and the discharge characteristics are significantly improved.
Furthermore, since the attachment of the discharge electrode and the formation of the discharge gap can be carried out during the conventional manufacturing process of multilayer chip capacitors, that is, during the process of printing the internal electrodes and cutting them to specified dimensions, no special equipment is required for this purpose. It has the advantage that there is no need for major process changes.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional CR composite part with a discharge gap, in which A is a plan view and B is a front view. 2 and 3 are side sectional views of a CR composite part with a discharge gap according to the present invention, respectively. 10... Ceramic for capacitor construction, 11,
11'... Electrode for capacitor, 12, 12'... Internal electrode, 13, 13'... Electrode for discharge, 14...
Cut groove, 20... Ceramic for resistor printing, 2
1, 21'... Resistor electrode, 22, 22'... Resistor.

Claims (1)

[Scope of utility model registration request] A CR composite component comprising a multilayer capacitor having a plurality of internal electrodes embedded in ceramic and a resistor integrally combined with the capacitor, wherein a discharge electrode is further embedded in the ceramic, and A discharge gap characterized in that the ceramic is provided with a cut groove across the discharge electrode, and a discharge gap is formed between the discharge electrodes exposed on a surface facing the cut groove. Includes CR composite parts.