JP2533603Y2 - LC composite parts - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an LC composite part,
An electronic component consisting of a capacitor in which opposing internal electrodes are formed in a dielectric ceramic, and an induct in which a coil is formed in a magnetic ceramic, as an integrated laminate, and combining these capacitors and inductors to form a circuit. More specifically, the present invention relates to an improvement in a conductor portion connecting a capacitor and an inductor of such an LC composite component.

[0002]

2. Description of the Related Art FIG. 5 shows an example of the appearance of a conventional LC composite component of this type, and FIG. 6 shows a circuit diagram thereof. The LC composite component has at least one pair of internal electrodes facing each other (not shown).
Part 2 made of a dielectric ceramic layer having
And an inductor portion 3 in which a magnetic ceramic layer having a circular internal conductor is laminated, and the internal electrodes are sequentially connected by through holes.
This is one in which a capacitor and an inductor are formed in one laminated body 1.

Such an LC composite component constitutes an equivalent circuit as shown in FIG. 6, for example. The capacitors and inductors respectively formed in the capacitor section 2 and the inductor section 3 are provided on the side of the laminate 1. Are connected by the formed film-shaped connection conductors 11, 11,.... The external electrodes 13 and 14 serving as output terminals of the LC composite component are also formed of a film-like conductor formed on the side surface of the multilayer body 1. Reference numerals 12 and 12 indicate neutral electrodes to which nothing is connected.

[0004]

An invention is, however, as shown in FIG. 6, when the combined number is a number of capacitors and inductors, connecting conductors 11 and 11 for connecting these
Are increased, and a large number of connection conductors 11, 11,... Must be formed on the limited side surfaces of the laminated body 1. Inevitably, the connection conductors 11, 11,. The line width becomes narrow, and the adhesion strength to the side surface of the laminate 1 becomes weak. For this reason, such an LC composite component is mounted on a circuit board, and the external electrodes 1 are mounted on electrode lands on the circuit board.
When the solders 3, 13,... Are to be soldered, the molten solder also adheres to the connection conductors 11, 11,. Thus L
After the C composite electronic component is mounted on the circuit board, another electronic component is mounted on the back side of the circuit board, for example, by the automatic component mounting device. At this time, the circuit board warps due to the impact of the automatic mounting device. Then, the connection conductor 1
1, 11,... Via the solder attached thereto,
The external force reaches 11 ... Thereby, the connection conductor 1
Are separated from the side surface of the multilayer body 1, which may cause a problem that the capacitor and the inductor formed inside the multilayer body 1 are disconnected. Accordingly, an object of the present invention is to provide an LC composite component that does not cause disconnection between a capacitor and an inductor inside a laminate due to a connection conductor in view of the above-mentioned conventional problems.

[0005]

According to the present invention, in order to achieve the above object, a ceramic laminate 1 having an internal conductor, and an inductor and a capacitor formed by the internal conductor on the side surface of the laminate 1 are provided. Having a connection conductor 6 for connecting the electrodes and external electrodes 4 and 5 as output terminals.
In the C composite component, the side surfaces and the end surfaces of the laminate 1 are formed.
Of the external electrodes 4 and 5 and the connection conductor 6
There is provided an LC composite component characterized in that the entirety of only the connection conductors 6 except for 4 and 5 is covered with a coating layer 7 which is not wetted by molten solder.

[0006]

In the LC composite component according to the present invention, except for the external electrodes 4 and 5 for soldering , the entirety of the connection conductor 6 formed only on the side surface of the multilayer body 1 for connecting the capacitor and the inductor. Is covered with a coating layer 7 that is not wetted by solder, so that this LC composite component is mounted on a circuit board, and when the external electrodes 4 and 5 are soldered to their electrode lands, the connection conductors are connected.
No solder adheres to the body 6. Therefore, this LC
Using an automatic component mounting device on the circuit board on which the
When mounting other electronic components, the circuit board may be warped.
However, the external force of the warp does not reach the connection conductor 6 via the solder . Therefore, the connection conductor 6 does not peel off from the multilayer body 1 due to external force, and the inductor and the capacitor inside the multilayer body 1 do not break. Furthermore, the coating layer 7 is
Except for the electrodes 4 and 5, only the connection conductor 6 is covered.
Therefore, the external electrodes 4 and 5 are easily soldered to the whole.
No. Therefore, when soldering to the circuit board, external electrodes
4 and 5 can be securely soldered.

【Example】

Next, in order to clarify the structure of the LC composite part, the embodiment of the present invention will be described together with its manufacturing procedure.
This will be specifically described. Fe ₂ O ₃ , ZnO, NiO, CuO
A Ni-Zn-Cu-based ferrite powder whose main component is
A slurry was formed by mixing a binder containing polyvinyl butyral as a main component, and the slurry was used to form a long magnetic green sheet having a thickness of 100 μm by a doctor blade method, which was cut into a predetermined size. Furthermore, by using these cut magnetic green sheets, FIG.
Then, seven types of green sheets having through holes and conductor patterns as shown by E to K were produced. In FIG.
The dotted portion is the conductor pattern, and the circular portion at the end is the through hole. The perforation of the through hole is performed simultaneously with the cutting of the green sheet. The conductor pattern is a circular conductor pattern that forms a part of the coil, and is formed by printing using a conductive paste such as an Ag paste and baking.

[0008] Separately, a dielectric green sheet was formed using a dielectric ceramic powder containing TiO ₂ as a main component and the same binder as described above, and this was cut into a predetermined size. Further, four types of dielectric green sheets having patterns as shown by A, B, C, and D in FIG. 2 were produced from the cut dielectric green sheets.
In FIG. 2, a portion provided with a dot is a conductor pattern, which is a conductor pattern for forming an internal electrode of a capacitor.
It is formed by printing and baking using a conductive paste such as a paste.

Next, four types of dielectric green sheets A to D shown in FIG. 2, seven types of magnetic green sheets E to K shown in FIG. A sheet is prepared, and these are laminated in the order shown in FIG. In FIG. 4A, the reference numeral with no reference numeral indicates a green sheet having no conductor pattern. In addition, the upper 8 including the 4 pieces of A to D
The green sheets are dielectric green sheets, and the green sheets below them are all magnetic sheets.
In FIGS. 2 and 3, for each green sheet, 1
FIG. 4 (a) shows that the printed patterns are stacked for each chip. In practice, however, a conductor pattern is printed and formed on a green sheet in units of a plurality of chips. And then cut into individual units. The chip-like laminate obtained in this way has a 900
It is fired at a temperature of ° C. for one hour.

FIG. 4B shows the appearance of the laminated body 1 after firing. This laminate has a capacitor portion 2 composed of a laminated portion of the dielectric green sheets and an inductor portion 3 composed of a laminated portion of the magnetic green sheets. Inside the former, a plurality of pairs of internal conductors formed by a conductor pattern face each other via a dielectric layer to form a capacitor, and inside the latter, a circular internal conductor formed by the conductor pattern Are sequentially connected via a through hole for each magnetic layer to form a coil.

In FIG. 4B, reference numeral 8 denotes an end of an internal conductor led out to a side surface of the laminate 1 for connecting the capacitor and the coil. Reference numerals 9 and 10 denote end portions of the internal conductors led out to the side surfaces of the laminate 1 to be output terminals of the LC composite component (those hidden behind the laminate 1 in FIG. 4 are not shown). is there. The laminated green sheets are cut into individual laminates 1 and baked so that the end portions of the internal conductors are exposed on the side surfaces and end surfaces of the laminate 1, and then, in practice, barrel polishing is performed. Is often polished.

Thereafter, as shown in FIG. 4 (c), to connect the ends of the conductive pattern,
A conductive paste such as a g paste is printed and baked to form the connection conductor 6. Next, as shown in FIG. 4D, a glass paste is printed and baked on the connection conductor 6 so as to cover the connection conductor 6, so that a coating layer 7 is formed. Finally, the side surfaces and end surfaces of the laminate 1 are A-shaped so as to contact the conductor patterns 9 and 10 serving as output terminals of the LC composite component.
A conductive paste such as a g paste is printed and baked to form external electrodes 4 and 5. The appearance of the LC component completed in this manner is shown in FIG. 1, and its equivalent circuit is the same as that shown in the conventional example.

The above is an example of the method of manufacturing the LC composite component of the present invention. If the LC component as shown in FIG. 1 is obtained as a result, the procedure does not matter. For example, the external electrodes 4 and 5 may be formed simultaneously with or before the formation of the connection conductor 6. Also,
The coating layer 7 may be a ceramic layer, a resin layer, a metal oxide layer, a metal layer, or the like in addition to the glass layer as long as the coating layer 7 does not wet the solder. However, as shown in FIG. 1A, when the covering layer 7 is formed over a plurality of connection conductors 6, it is necessary to form it with an insulator. In the case where the coating layer 7 is divided and formed every time, it may be formed of a conductor.

[0014]

As described above, according to the present invention, when the LC composite component is mounted on the circuit board and the external electrodes 4 and 5 are soldered to the electrode lands, the inductor and the capacitor inside the multilayer body 1 are connected. However, when the wire is hardly disconnected, an advantageous effect can be obtained.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an LC composite component according to an embodiment of the present invention.

FIG. 2 is a plan view showing a conductor pattern of a green sheet constituting a capacitor part of the LC composite component according to the embodiment of the present invention.

FIG. 3 is a plan view showing a conductor pattern of a green sheet constituting an inductor part of the LC composite component according to the embodiment of the present invention;

FIG. 4 is a perspective view showing a manufacturing procedure of the LC composite component according to the embodiment of the present invention.

FIG. 5 is an external perspective view of a conventional LC composite component.

FIG. 6 is an equivalent circuit diagram of a conventional LC composite component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 6 Connection conductor 4 External electrode 5 External electrode 6 Connection conductor 7 Coating layer

Claims (1)

(57) [Scope of request for utility model registration] 1. A ceramic laminate (1) having an internal conductor, a connection conductor (6) for connecting an inductor and a capacitor formed by the internal conductor on a side surface of the laminate (1), and an output terminal An external electrode (4),
(5) an external electrode (4) formed on a side surface and an end surface of the laminate (1);
(5) Out of the connection conductor (6), which is an output terminal
The entirety of the electrodes (4) and (5) is exposed to the outside, and a non-output terminal
An LC composite component characterized in that the entirety of the connection conductor (6) is covered with a coating layer (7) that does not wet the molten solder.