JPH01208007A - Resonator and its manufacture - Google Patents

Abstract

PURPOSE:To facilitate manufacturing and to realize shielding by forming a resonator in such structure that a dielectric layer, a surface and a back plane electrode layers, a sheet layer, a shield electrode layer, and a protection layer are laminated. CONSTITUTION:On the resonator, a sheet shape protection layer 1 consisting of a dielectric or an insulator, the shield electrode layer 2, the sheet layer 3 consisting of the dielectric or the insulator, the back plane electrode layer 4, the dielectric layer 5, the surface electrode layer 6, the sheet layer 7 consisting of the dielectric or the insulator, the shield electrode layer 8, and the protection layer 9 similar to the layer 1 are provided in sequence as above from the lowest layer. Since such laminate body is formed and is formed by sintering, the resonator can be manufactured easily. Also, by laminating a sheet material for shielding on both sides sandwiching the resonator, no deviation of a resonance frequency can be generated even when a conductor approaches. Furthermore, since the thickness of the sheet layer can be varied, it is possible to adjust the resonance frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resonator whose main structure is a resonator body in which conductive patterns are formed on both sides of a layered dielectric material, and a method for manufacturing the same.

As one of the above-mentioned resonators, Fig. 6 (partially cutaway front view) and Fig. 7 (cross-sectional view indicated by the green line in Fig. 6)
As shown in FIG. 2, U-shaped conductive patterns 23 and 24 are formed on the front and back surfaces of the dielectric substrate 20 obtained by firing, and the lead terminals 21 for external extraction are soldered, and then the lead terminals 21 are removed. Some products are manufactured by immersing this in an insulating resin bath to form a resin film 22.

A resonator with such a configuration is disclosed in Japanese Patent Application No. 61-097 by the present applicant.
Proposed in No. 313. Incidentally, this electrical effect will be explained in the embodiment.

Therefore, in the conventional method, various different manufacturing methods are required, such as baking the board, forming a conductive pattern, soldering the lead terminals, and immersing them in resin. Manufacturing is complicated because it requires technology, and
Since the manufactured resonator needs to be attached to a circuit board using lead terminals, there is a problem in that so-called surface mounting is difficult. Furthermore, since there is no shielding around the resonator, if there is a conductor such as metal nearby, the resonance frequency will shift. Furthermore, since the resonator main body is covered with a resin film, the internal conductive pattern cannot be trimmed, making it difficult to adjust the resonant frequency.

The present invention has been made in view of the above circumstances, and provides a resonator that can be easily manufactured, can be surface mounted, can be shielded, and can adjust the resonant frequency, and a method for manufacturing the same. The purpose is to

The resonator according to the present invention for resonating i- has a dielectric layer, and a front electrode layer and a back electrode that are provided on both sides of the dielectric layer and constitute the resonator body together with the dielectric layer. a pair of sheet layers made of a dielectric or insulator provided on both sides of the resonator body, and a pair of shield electrode layers provided on both sides of the resonator body and the pair of sheet layers. and a pair of protective layers made of a dielectric or an insulator provided on both sides of the resonator main body, a pair of sheet layers, and a pair of shield electrode layers, and separately for the front electrode layer and the back electrode layer, respectively. It is characterized by comprising a pair of terminal electrode films that are connected and exposed to the outside while being insulated from the others.

Further, the method for manufacturing a resonator according to the present invention includes a protective layer and a shield electrode layer made of a dielectric or an insulator.

Sheet layer and back electrode layer made of dielectric or insulator.

Dielectric layer 1 A front electrode layer, a sheet layer made of a dielectric or an insulator, a shield electrode layer, and a protective layer made of a dielectric or an insulator are laminated in this order, and each of the front electrode layer and the back electrode layer is laminated in this order. a step of forming a laminate with a part exposed, and a pair of terminal electrodes that are electrically connected to a part of each of the front electrode layer and the back electrode layer and exposed to the outside while being insulated from the other parts; The method is characterized by including a step of forming a film and a step of firing the laminate.

Production-m- ■ In the present invention, the resonator has a structure in which a dielectric layer, a front electrode layer, a back electrode layer, a sheet layer, a shield electrode layer, and a protective layer are laminated, so the resonator is manufactured by laminating layers. This can be done by using the conventional technology, without requiring various different manufacturing technologies, and by forming a pair of terminal electrode films connected to the front electrode layer and the back electrode layer on the outside of the laminate. Therefore, it can be mounted simply by placing it on a circuit board. In addition, since shield electrode layers are arranged on both sides of the resonator body, this has a shielding effect on the resonator body, and the distance between the resonator body and the shield electrode layer can be adjusted by adjusting the thickness of the sheet layer. It can be adjusted by changing it and contributes to adjusting the resonant frequency.

Figure 1 is an external perspective view showing an embodiment of the product of the present invention, Figure 2 is a sectional view (front view) taken along line nn in Figure 1, and Figure 3 is a cross-sectional view of Figure 2. FIG. 2 is a cross-sectional view (plan view) taken along line II[-111. The resonator according to the present invention has a rectangular shape in which nine layers are laminated as shown in Fig. 1. The resonator is made of a dielectric or an insulator in order from the bottom layer, and has a thickness of 20 to 50 μm. A sheet-shaped protective layer 1. Shield electrode layer 2. 3. A sheet layer of dielectric or insulator having a thickness of 1 to 1.5 mm. Back electrode layer made of a conductive material such as copper 4. Dielectric material, e.g. Bao
Made of 5iOz Zr0z-based dielectric material with a thickness of 2
5. A sheet-like dielectric layer with a thickness of 0 to 50 μm. 6. A surface electrode layer made of a conductive material such as copper. A sheet layer 7 with a thickness of 1 to 1.5 m made of a dielectric or an insulator, a shield electrode layer 8, and
A sheet-like protective layer 9 made of a dielectric or an insulator and having a thickness of 20 to 50 μm is provided.

The back electrode layer 4 and the front electrode layer 6 are composed of two capacitor electrode patterns 61, 62, 41, 42 as shown in FIG.
It is connected by two coil patterns 63 and 43, and has a U-shaped pattern shape in plan view. The capacitor electrode patterns 61 and 41 and 62 and 42 are formed on the dielectric layer 5, respectively.
, and form capacitors C1 and C2 having capacities determined by the dielectric constant and thickness of the dielectric layer 5, and the facing area of the capacitor electrodes. On the other hand, the coil patterns 63 and 43 are formed to connect the two capacitor electrode patterns 61 and 62, and 41 and 42 on each of the front and back surfaces of the dielectric layer 5, respectively. Each coil pattern 63, 43 forms a coil in terms of high frequency, so if its inductance is Ll and L2, the resonator body has a coil LL on both sides of the first capacitor C1, as shown in FIG.

This is an equivalent circuit in which a second capacitor C2 is connected in parallel to an LC circuit in which L2 is connected in series. A resonator made of this equivalent circuit has a very high Q and is suitable for filters and oscillation elements used in high frequency ranges, but when the inductance is constructed by a coil pattern, it is difficult to use a conductor such as a metal. It is necessary to provide a shield so that the resonant frequency does not shift even when approaching. In addition,
This equivalent circuit is the same for the conventional product shown in FIG.

Further, both the back electrode layer 4 and the front electrode layer 6 have tongues 4a and 6a that reach one side of the resonator.
The exposed portion of a is electrically connected to terminal electrode films 10.degree. 11 made of a conductive material such as silver, which are formed in an upward letter shape on the side surface portion below this and the bottom portion following this.

The terminal electrode films 10 and 11 are formed so as to be electrically insulated from each other and from other layers.

A method of manufacturing a resonator having such a structure will be described next. First, a protective layer 1, sheet layers 3 and 7, and a dielectric layer 5 are prepared,
A shield electrode 2 is formed by screen printing or applying a paste made of a conductive material such as copper on the surface of the protective layer 1, and a U-shape having the tongue piece 4a is formed on the surface of the sheet layer 3 in the same manner. A patterned back electrode 4 is formed, and the tongue pieces 6a are formed on the surface of the dielectric layer 5 in the same manner.
A U-shaped surface electrode 6 having a U-shaped pattern is formed, and a shield electrode 8 is further formed on the surface of the sheet layer 7 in the same manner, and these are stacked together with a protective layer 9 and then crimped to form a nine-layer laminate. A paste made of a conductive material such as copper or silver is printed on the exposed portions of the tongues 4a, 6a, the side surfaces below these, and the bottom surface following these in this laminate to form a terminal electrode film 10. After forming .11, the laminate is fired at, for example, 1000°C for 2 hours.

Note that the positions where the shield electrodes 2 and 8, the back electrode 4, and the front electrode 6 are formed are not limited to those described above.
For example, the shield electrode 2 may be formed not on the surface of the protective layer 1 but on the back surface of the sheet layer 3.

In the resonator manufactured in this manner, the terminal electrode films 10 and 11 are exposed to the outside and formed in the form of a film, so it is easy to place the resonator by aligning these with the circuit board. This allows surface mounting.

Note that crimping is not an essential requirement of the present invention. Furthermore, excluding the front electrode layer 6, the back electrode layer 4, and the shield electrode layers 2 and 8 (each of the above five layers may be composed of one sheet material or two or more sheet materials made of the same material). may be configured by overlapping them.

Shield electrode layers 8 and 2 are disposed on the upper and lower sides of the resonator body, respectively, with sheet layers 7.3 interposed therebetween.

For this reason, the resonator body is shielded by this shield electrode layer 8.2, and by changing the thickness of either or both of the sheet layers 7.3, that is, by changing the thickness of one sheet material. Alternatively, the resonant frequency of the resonator can be adjusted by increasing or decreasing the number of sheet materials constituting the sheet layers 7 and 3. For example, the case where the resonance frequency is adjusted by changing the thickness of the seven sheet layers will be described below.

First, if the resonant frequency is higher than a desired value, the sheet layer 7 is made thicker. This separates the resonator body from the shield electrode layer 8, thereby lowering the resonant frequency. As a result, the resonance frequency can be adjusted from curve 1 to curve 2 as shown in FIG. 5 (frequency characteristic curve).

Conversely, if the resonant frequency is lower than the desired value, the sheet layer 7 is made thinner. As a result, contrary to the above case, the shield electrode layer approaches the resonator body, so curve 1 changes to curve 3, and the resonant frequency increases.

Further, the sheet layers 7 and 3 described above can each have a uniform thickness, so that the shield electrode layers 8 and 2,
The front and back electrode layers 6 and 4 can be made parallel, and the spacing can be made constant, for example, one or more. Thereby, deterioration of the Q of the shielded resonator can be suppressed.

Although the shield electrode layer is not grounded in this embodiment, a higher shielding effect can be obtained by connecting it to an external ground potential. In that case, a tongue piece is provided on the shield electrode layer 2゜8 so as to reach the side surface of the resonator opposite to the side surface on which the terminal electrode film 10.11 is formed, and a silver paste etc. is provided between this tongue piece and the ground. It is recommended to short-circuit using .

Further, in the above embodiment, the front electrode layer 6, the back electrode layer 4, and the shield electrode layer 2.8 are formed by printing or coating, but the present invention is not limited to this. Alternatively, sheet materials made of conductive material may be prepared for the shield electrode layers 2 and 8, and nine sheet materials may be stacked on top of each other. It is also possible to prepare one or more sheets of conductive material and to overlap each sheet in conjunction with printing or coating.

Further, it is optional whether the protective layers 1 and 9, the sheet layers 3 and 7, and the dielectric layer 5 are each formed by one sheet material or by laminating a plurality of sheet materials. You can choose.

As described in more detail with Kokunizuka, in the case of the present invention, a laminate is formed by laminating each layer, and this is formed by firing.
The number of different manufacturing techniques can be reduced, which makes it possible to easily manufacture the resonator, and since the terminal electrode film is provided externally, surface mounting can be performed.

In addition, since the resonator body is shielded by laminating shielding sheet materials on both sides of the resonator body, there is no shift in the resonant frequency even if a conductor such as metal approaches, and furthermore, the resonance Since the thickness of the sheet layer between the device body and the shield electrode layer can be changed, excellent effects such as the ability to adjust the resonance frequency can be achieved.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing an embodiment of the product of the present invention, Fig. 2 is a cross-sectional view (front view) taken along line ■-■ in Fig. 1, and Fig. 3 is taken along line m-m in Fig. 2. A cross-sectional view (plan view), Fig. 4 is an equivalent circuit diagram of the resonator main body of the product of the present invention, Fig. 5 is a graph showing the frequency characteristic curve of the product of the present invention, and Fig. 6 is a partially cutaway diagram of the conventional product. The front view and FIG. 7 are cross-sectional views taken along the line ■-■ in FIG. 6. 1.9... Protective layer, 2.8... Shield electrode layer, 3
．． 7... Sheet layer, 4... Back electrode layer, 5... Dielectric layer, 6... Front electrode layer, 10.11... Terminal electrode film. Patent Applicant 2 Murata Manufacturing Co., Ltd. Figure 1 Figure 2 ]] Figure 3 Figure 4

Claims (2)

[Claims] (1) A dielectric layer, and a front electrode layer and a back electrode layer, which are provided on both sides of the dielectric layer and which together with the dielectric layer constitute a resonator body; and a front electrode layer and a back electrode layer, which are provided on both sides with the resonator body in between. a pair of sheet layers made of a dielectric or insulator; a pair of shield electrode layers provided on both sides of the resonator body and the pair of sheet layers; A pair of protective layers made of a dielectric or an insulator are provided on both sides of the shield electrode layer, and are connected to the front electrode layer and the back electrode layer separately, and are insulated from the other layers and exposed to the outside. A resonator comprising a pair of exposed terminal electrode films. (2) In the method of manufacturing a resonator, a protective layer made of a dielectric or an insulator, a shield electrode layer, a sheet layer made of a dielectric or an insulator, a back electrode layer, a dielectric layer, a front electrode layer, a dielectric or Forming a laminate in which a sheet layer made of an insulator, a shield electrode layer, and a protective layer made of a dielectric or insulator are laminated in this order, with a portion of each of the front electrode layer and the back electrode layer exposed. a step of forming a pair of terminal electrode films by electrically connecting a part of each of the front electrode layer and the back electrode layer and exposing them to the outside while being insulated from the others; A method for manufacturing a resonator, the method comprising: firing the resonator.