JPH0634229U - LC composite parts - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] No short circuit or disconnection between the capacitor and inductor inside the laminated body 1 due to the connecting conductor 6, the surface is flat, and the suction nozzle of the automatic mounting device reliably sucks. It can be so. [Structure] Recesses 8 and 9 are formed on the side surface of the laminate 1, and in order to connect the inductor and the capacitor formed inside the laminate 1, a part of the internal conductor is placed in the recesses 8 and 9. Let it out. A connection conductor 6 is formed in the recesses 8 and 9, and predetermined internal electrodes in the laminate 1 are connected to each other by the connection conductor 6. Further, the above-mentioned recesses 8 and 9 are filled with the coating material 7 which is not wet with the molten solder. The external electrodes 4 and 5, which are output terminals, are exposed to the outside without being covered with the coating layer 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention comprises an LC composite component, that is, a capacitor in which opposing internal electrodes are formed in a dielectric ceramic, and an inductor in which a coil is formed in a magnetic ceramic, which are formed as a single laminated body. The present invention relates to an electronic component in which a circuit is configured by combining an inductor and an inductor, and more specifically, to improvement of a conductor portion connecting the capacitor and the inductor of such an LC composite component.

[0002]

[Prior art]

 Fig. 6 shows an example of the appearance of this type of conventional LC composite component, and Fig. 7 shows its circuit diagram. In this LC composite component, a capacitor portion 2 composed of a dielectric ceramic layer having a pair of internal electrodes (not shown) facing each other and a magnetic ceramic layer having a circular internal conductor are laminated, It has an inductor portion 3 in which internal electrodes are sequentially connected by through holes, and these are vertically stacked to form a capacitor and an inductor in one laminated body 1.

Such an LC composite component constitutes an equivalent circuit as shown in, for example, FIGS. 6 and 7, but the capacitors and the inductors respectively formed in the capacitor section 2 and the inductor section 3 are laminated. They are connected by the film-like connection conductors 21, 21 ... Formed on the side surface of the body 1. The external electrodes 23 and 24, which are the output terminals of the LC composite component, are also formed of the film-shaped conductor formed on the side surface of the laminate 1. Note that reference numerals 22 and 22 are independent electrodes that are not connected at all.

[0004]

[Problems that the device is trying to solve]

 However, as shown in FIG. 7, when the number of combinations of capacitors and inductors increases, the number of connecting conductors 21, 21 ... Connecting these capacitors and inductors also increases, as shown in FIG. A large number of connecting conductors 21, 21 ... Must be formed on the side surface of the laminated body 1. Along with this, the line widths of the connection conductors 21, 21, ... And the external electrodes 23, 24 are inevitably narrowed, and the adhesion strength of these to the side surface of the laminated body 1 is weakened. Therefore, when such an LC composite component is mounted on a circuit board and the external electrodes 23, 24 are to be soldered to the electrode lands on the circuit board, they are also melted in the connection conductors 21, 21 ... There was a problem that solder adhered and short-circuited the capacitors and inductors inside the laminate.

Further, after such an LC composite electronic component is mounted on the circuit board, another electronic component is also mounted on the back surface side of the circuit board by the automatic component mounting device, for example. At this time, the circuit board warps due to the impact of the automatic mounting device. Then, an external force is applied to the connection conductors 21, 21 ... via the solder attached to the connection conductors 21, 21. As a result, the connection conductors 21, 21 ... Are peeled off from the side surface of the laminated body 1 and the capacitor and the inductor formed inside the laminated body 1 may be disconnected.

Further, such an LC composite component is mounted on a circuit board by an automatic mounter. However, when the component is downsized and becomes as small as 1.0 mm in length and 0.5 mm in width and height, it is automatically In the mounting device, air leakage from the tip of the suction nozzle that sucks and holds the LC composite component becomes a problem. From the viewpoint of preventing such air leakage, it is preferable that the surface of the LC component is as uneven as possible. However, the connection conductors 21, 21 ... Formed on the surface of the laminate 1 as described above impede the flat state of the surface of the LC composite component. Further, when an insulating protective film is formed on the connecting conductors 21 to prevent the connection conductors 21 and 21 from being short-circuited or peeled off, the flatness of the surface of the component is further impaired and the dimensions of the component are increased. There is a problem of terminating. Therefore, in view of the above-mentioned conventional problems, the present invention does not cause short circuit or disconnection between the capacitor and the inductor inside the laminated body due to the connecting conductor, and the surface is flat, so that the suction nozzle of the automatic mounting device can surely suck. The purpose is to provide LC composite parts.

[0007]

[Means for Solving the Problems]

 That is, according to the present invention, in order to achieve the above object, 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 In an LC composite component having external electrodes 4 and 5 which are terminals, concave portions 8 and 9 are formed in the side surface portion of the laminated body 1, and the inner conductors of the respective layers of the laminated body 1 are formed in the concave portions 8 and 9. Provided is an LC composite part, characterized in that a connection conductor (6) to be connected to each other is formed and a coating material (7) which is not wet with molten solder is filled in the recesses (8, 9).

[Action]

In the LC composite component according to the present invention, except for the external electrodes 4 and 5 for soldering, the connection conductor 6 only for connecting the capacitor and the inductor is formed in the concave portion formed on the side surface of the laminate 1. Since the recesses 8 and 9 are formed in the inside 8 and 9, and the coating material 7 that does not wet the solder is filled in the recesses 8 and 9, the LC composite component is mounted on the circuit board, and the external electrodes 4 and 5 are soldered to the electrode lands. Sometimes solder does not adhere to the connecting conductor 6. Therefore, the connection conductor 8 is prevented from short-circuiting, and the external force caused by the warp of the circuit board does not reach the connection conductor 6 through the solder. 1 does not peel off, and the inductor and the capacitor inside the laminated body 1 are not disconnected. Furthermore, since the connecting conductor 6 is formed in the recesses 8 and 9 and the covering material 7 is filled therein, the side surface of the LC composite component can be made flat. As a result, it is possible to prevent air leakage from the suction nozzle of the automatic mounter, and it is possible to reliably suck and hold the suction nozzle.

【Example】

Next, in order to clarify the configuration of the LC composite component, the embodiment of the present invention will be specifically described together with its manufacturing procedure. Fe ₂ O _3, ZnO, constitute NiO, and the Ni-Zn-Cu-based ferrite powder based on CuO, were mixed with a binder mainly composed of polyvinyl butyral slurries, doctor blade and the slurry By the method, a long magnetic green sheet having a thickness of 100 μm was formed and cut into a predetermined size. Further, seven types of green sheets having through holes and conductor patterns as shown by E to K in FIG. 4 were made from these cut magnetic green sheets. In FIG. 4, the shaded portion is the conductor pattern, and the circular portion at the end is the through hole. The through hole is punched at the same time as 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 with a conductive paste such as Ag paste and baking. In these green sheets, for example, as shown in E, J, and K patterns of FIG. 4, a conductor pattern is connected by a connecting conductor 6 which will be described later. Therefore, a part of the conductor pattern is attached to a side edge of the green sheet. Recesses 8'and 9'are formed by notches in the lead-out portion and the portion corresponding thereto.

Separately from this, a dielectric green sheet was formed by using a dielectric ceramic powder containing TiO ₂ as a main component and a binder similar to the above, and this was cut into a predetermined size. Further, four types of dielectric green sheets having patterns shown by A, B, C and D in FIG. 3 were made from the cut dielectric green sheets. In FIG. 3, the shaded area is the conductor pattern, which is the conductor pattern forming the internal electrode of the capacitor. Like the magnetic green sheet, a conductive paste such as Ag paste is used. It is formed by printing and printing. In these green sheets, recesses 8'and 9'having the same shape are formed corresponding to the recesses 8'and 9'formed in the side edges of the green sheet shown in FIG. The recesses 8 ′ and 9 ′ are connected to the conductor patterns of E, J and K of FIG. 4 like the conductor patterns of B, C and D of FIG. It corresponds to the part that did.

Next, four kinds of dielectric green sheets A to D shown in FIG. 3, seven kinds of magnetic green sheets E to K shown in FIG. 4 and a dielectric green sheet X on which nothing is printed, Y and magnetic sheets X ′ and Y ′ are prepared, these are laminated in the order shown in FIG. Here, as shown in FIG. 5 (a), green sheets X, Y, X ', and Y'having no conductor pattern have concave portions corresponding to the concave portions 8'and 9'of the green sheets A to K. 8'and 9'are formed. The upper eight green sheets including four sheets A to D and the green sheets X and Y having no conductor pattern above and below them are dielectric green sheets, and the lower green sheets are all magnetic sheets. . 3 and 4, the print pattern for each chip is shown for each green sheet, and in FIG. 5 (a), these are shown to be stacked for each chip. A conductor pattern is printed and formed on a green sheet in units of multiple chips, these are laminated and then cut into individual units. The chip-shaped laminated body thus obtained is baked at a temperature of 900 ° C. for 1 hour.

The appearance of the laminated body 1 after firing is shown in FIG. This laminated body has a capacitor portion 2 formed of a laminated portion of the dielectric green sheets and an inductor portion 3 formed of a laminated portion of a magnetic green sheet. Inside the former, a plurality of pairs of internal conductors formed by the conductor pattern face each other through the dielectric layer to form a capacitor, and inside the latter, the spiral shape formed by the conductor pattern is formed. The internal conductors are sequentially connected to each magnetic layer through through holes to form a coil.

In FIG. 5 (b), 10 is an end portion of the internal conductor led out to the side surface of the laminated body 1 for connecting these capacitors and the coil. A recessed portion 8 formed by overlapping is formed. Further, a recess 9 formed by the upper and lower overlapping of the recess 9 ′ is also formed on the other side surface opposite to the side surface on which the recess 8 is formed. Reference numerals 11 and 12 denote the ends of the internal conductors led out to the side surfaces of the laminate 1 that are to be the output terminals of the LC composite component (the ones hidden behind the laminate 1 in FIG. 5 are not shown. No.). It should be noted that the laminated green sheets are cut into individual laminates 1 so that the end portions of the internal conductors as described above are exposed on the side surfaces and the end faces of the laminate 1, and after firing, the barrel polishing method is actually performed. In many cases, it is polished by such as.

As shown in FIG. 5C, in order to connect the end portions of the conductor pattern, a conductive paste such as Ag paste is printed on the side surface of the recess 8 of the laminated body 1 and baked to connect the connection conductor 6 To form. In addition, in FIG. 5C, the side surface on the concave portion 9 side is shaded and cannot be seen, but similarly, the connection conductor 6 is formed there. Next, as shown in FIG. 5D, a glass paste is applied and filled in the recesses 8 and 9 so as to cover the connecting conductor 6, and this is baked to form a covering material 7. Finally, a conductive paste such as Ag paste is printed on the side surface and the end surface of the laminated body 1 so as to come into contact with the conductor patterns 11 and 12 serving as the output terminals of the LC composite component, and this is baked to burn the external electrodes 4, 5 is formed. The appearance of the LC component thus completed is shown in FIG. 1, and its equivalent circuit is similar to that shown in the conventional example.

The above is an example of the method for producing the LC composite part of the present invention, and if the LC part 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 at the same time as or before the connection conductor 6 is formed. In addition, in the above-described embodiment, the recesses 8 ′ and 9 ′ are formed in the green sheet in advance to form the recesses 8 and 9 in the laminate 1. However, the recesses 8 and 9 cut the side surface of the laminate 1. You may form by doing. The covering material 7 is not limited to the glass layer and may be a ceramic layer, a resin layer, a metal oxide layer, a metal layer, or the like as long as it is not wet with solder and has an insulating property. Further, these pasty materials may be filled and solidified to form the covering material 7, or the pre-formed covering material 7 may be embedded in the concave portion. However, as shown in FIG. 1A, when the covering material 7 is formed over a plurality of connecting conductors 6, it is necessary that the covering material 7 is formed of an insulator, When the covering material 7 is divided and formed for each, it may be formed of a conductor.

Further, the recesses 8 and 9 do not need to be formed on the upper and lower sides of the side surface of the laminated body 1. For example, as shown in FIG. 2, the upper and lower portions of the side surface of the laminated body 1 are left and surrounded by four sides. The recesses 8 and 9 in the open state may be formed. In this case, in FIG. 5 (a), the green sheets X and X'having no conductor patterns which are vertically stacked are laminated with the green sheets X and X'which do not have the concave portions 8 and 9'as described above. Can be formed. It is the same as in the above-mentioned embodiment that the insulating material 7 is filled also in the recesses 8 and 9.

[0017]

[Effect of device]

 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 laminate 1 are short-circuited or disconnected. At the same time, there is no unevenness on the surface, and it is possible to obtain the effect that it can be surely sucked and held on the tip of the suction nozzle such as an automatic mounter.

[Brief description of drawings]

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

FIG. 2 is an external perspective view of an LC composite component according to another embodiment of the present invention.

FIG. 3 is a plan view showing a conductor pattern of a green sheet that constitutes a capacitor portion of an LC composite component according to these examples.

FIG. 4 is a plan view showing a conductor pattern of a green sheet that constitutes an inductor portion of an LC composite component according to these examples.

5 is a perspective view showing a manufacturing procedure of the LC composite component according to the embodiment of FIG. 1. FIG.

FIG. 6 is an external perspective view of an LC composite component according to a conventional example.

FIG. 7 is an equivalent circuit diagram of an LC composite component according to a conventional example.

[Explanation of symbols]

 1 Laminated body 6 Connection conductor 4 External electrode 5 External electrode 6 Connection conductor 7 Coating material 8 Recessed portion 9 Recessed portion

Claims (1)

[Reference number] 0040426-01 [Claims for utility model registration] 1. A ceramic laminate (1) having an internal conductor, a connecting 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. In the LC composite component having the external electrodes (4) and (5), the recesses (8) and (9) are formed in the side surface of the laminate (1), and the recesses (8) and
A connection conductor (6) for connecting the inner conductors of the respective layers of the laminate (1) to each other is formed in (9), and the recess (8),
An LC composite component, characterized in that (9) is filled with a coating material (7) that does not wet the molten solder.