JP2844582B2 - Resonator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a resonator having an equivalent circuit in which a capacitor and a coil are connected in parallel.

2. Description of the Related Art As a conventional resonator, as shown in FIG. 4, an L-shaped pattern electrode 21 and a U-shaped electrode 21 are provided on the front and back surfaces of a dielectric substrate 20 in a state where opposing portions A and non-opposing portions B are present. An electrode 22 having a V-shaped pattern is formed, and the portions of the two electrodes 21 and 22 in the non-opposing portion B are connected via a through hole 20a provided through the dielectric substrate 20 as shown in FIG. Structure. In a resonator having such a structure, both electrodes 2
Since the first and second opposed portions A are used as input / output terminals, a parallel resonance circuit is formed in which a capacitor C formed by the opposed portion A and a coil L formed by the non-opposed portion B are connected in parallel. The equivalent circuit is shown in FIG.

However, in the above-described resonator, since the facing portion A of the two electrodes 21 and 22 is used as an input / output terminal as described above, surface mounting cannot be performed. Since the coil has a planar structure in which the coils are arranged on a dielectric substrate, there is a problem that the coil is increased in size.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a small-sized resonator that can be mounted on a surface.

Means for Solving the Problems The present invention relates to a resonator having an equivalent circuit in which a capacitor and a coil are connected in parallel, from a laminated body in which dielectric sheets of the same material and the same shape are laminated such that all outer edges overlap. And a capacitor part composed of a pair of electrodes facing each other with a dielectric sheet layer interposed therebetween, and a coil part composed of strip-shaped electrodes formed on the same plane on one dielectric sheet. At least thicker than between the electrodes of the capacitor portion, and laminated via an intermediate layer that reduces electromagnetic influence on the capacitor, and one end of one electrode of the capacitor portion on one side surface of the laminate. The ends of the electrodes of the coil portion are drawn out, and the end of the other electrode of the capacitor portion and the end of the electrode of the coil portion are drawn out on the side surface facing the one side surface of the laminate, and each of the laminates is drawn out. side The band-shaped terminal electrodes, which are wider than the ends of the electrodes of the coil portion and are narrower than the side surfaces of the laminate, are connected to the respective ends of the electrodes of the capacitor portion and the coil portion that are drawn out. It is characterized in that it is formed on each of the side surfaces of the laminate in parallel.

In the present invention, since the electrodes of the capacitor section and the coil section are connected in a predetermined connection state to the terminal electrodes formed on the side surfaces of the laminate, the terminal electrodes may be used as external connection terminals. Along with that, the portion from this terminal portion to the portion connected to the coil portion also functions as a coil, and the capacitor portion is connected in parallel to a substantial coil consisting of the portion functioning as this coil and the laminated coil portion It becomes a parallel resonance circuit.

Further, since the capacitor portion and the coil portion are provided in the thickness direction of the laminate, they have a three-dimensional structure.

Embodiment FIG. 1 is an exploded perspective view showing an embodiment of a resonator according to the present invention, FIG. 2 is a sectional view showing an integrated state of the resonator, and FIG. 3 is a side view of the resonator. FIG.
As shown in FIG. 2, the resonator has an electrode 2 provided on a lowermost protective layer 1 made of a dielectric material or the like so as to face the dielectric layer 3 and both surfaces 3a and 3b with the dielectric layer 3 interposed therebetween. , 4 are further disposed thereon, and further thereon, an intermediate layer 6 composed of a dielectric or the like, a coil part composed of a planar electrode 7, a layer 8 composed of a dielectric or the like, and a film Shaped shield electrode 9
And a protective layer 10 made of a dielectric material and the like are arranged in this order, and the upper and lower surfaces 11a and 11b of the laminate 11 are formed.
And terminal electrodes 12 and 13 having a U-shaped cross section are formed over the two end portions 11c and 11d of the side surfaces connected to the end portions. Note that all of the above electrodes use a conductive material such as Cu or Ag.

A pair of electrodes 2 and 4 that constitute the capacitor unit 5 and face each other
As shown in FIG. 1, each of the electrode 2 has one (lower) electrode lead-out portion 2a, 4a drawn out to the side surface 11c, 11d to be connected to one of the terminal electrodes 12, 13, respectively. Is connected to the terminal electrode 12 on the left side of the drawing via the electrode lead-out portion 2a, and the other (upper) electrode 4 is connected to the terminal electrode 13 on the right side of the drawing via the electrode lead-out portion 4a. Is the dielectric layer 3
Has an electrostatic capacitance because of the interposition.

The flat electrode 7 constituting the coil portion has two electrode extraction portions 7a and 7b drawn to the side surfaces 11c and 11d at both ends to be connected to the terminal electrodes 12 and 13 on both sides, and one electrode extraction portion. 7a is connected to the left terminal electrode 12, and the other electrode lead portion 7b is connected to the right terminal electrode 13.

The resonator having such a configuration has been fired and can be produced, for example, as shown in FIG. That is,
A large number of green sheets made of an unfired dielectric were prepared, and the electrode 2 having the above-described electrode lead portion 2a, the electrode 4 having the electrode lead portion 4a, and the electrode lead The electrode 7 having the portions 7a and 7b and the shield electrode 8 are formed by printing or the like. The shield electrode 8 is formed smaller than the green sheet on which the shield electrode 8 is provided so as not to contact the terminal electrodes 12 and 13. For the electrodes 2, 4, 7, and 8, metal sheets may be used.

Then, with the electrodes 2 and 4
Are stacked on top of each other with the electrode 2 facing downward and the electrode lead-out portions 2a and 4a facing the other side, and a desired number of green sheets on which no electrode is formed and an electrode 7 , A green sheet on which the shielding electrode 9 is formed, and one green sheet on which no electrode is formed are laminated in this order and pressed, and the terminal is attached to a side surface of the pressed laminate. The electrodes 12, 13 are formed by printing or the like, and thereafter, the electrodes in this state are fired. Although the terminal electrodes 12 and 13 are also partially formed on the upper and lower surfaces of the laminate, this portion is unavoidably formed in the processing when printing or the like is performed, and may not be formed. Absent.

By the above-mentioned firing, the lowermost green sheet forms the protective layer 1, the green sheet between the facing electrodes 2 and 4 serves as the dielectric layer 3, and the electrode 4 and the electrode 7 forming the coil portion.
The green sheet between them forms the intermediate layer 6, the green sheet between the electrode 7 and the shielding electrode 9 forms the layer 8, and the green sheet above the shielding electrode 9 forms the protective layer 10. Further, the portion where the green sheets are joined to each other is integrated.

The resonator thus formed has the sectional structure shown in FIG. 2, and the side surface is as shown in FIG.
Therefore, this resonator is set on a wiring board (not shown) with the shield electrode 9 facing upward, and the terminal electrodes 12, 1
3 can be attached by soldering to the wiring formed on the wiring board, and surface mounting is possible.

Also, in the state mounted as described above, the terminal electrode 1
Reference numerals 2 and 13 function as terminals for external connection, and from the terminal portion to the portion where the electrode lead portions 7a and 7b of the electrode 7 are connected functions as a coil. For this reason, a substantial coil is composed of a part of the terminal electrodes 12 and 13 and a coil portion including the electrode 7. On the other hand, since the dielectric layer 3 exists between the opposing electrodes 2 and 4, an electrostatic capacitance is generated to function as a capacitor, and this capacitor exists between the terminals in parallel with the substantial coil described above. Therefore, this resonator forms a parallel resonance circuit. It is preferable that the thickness of the intermediate layer 6 interposed between the capacitor unit 5 and the coil unit 7 is such that the electromagnetic effect is hardly exerted between the two electric elements. About 1.
It is good to be 0mm-2.0mm. The other layers 1, 3, except for the middle layer 6
The number of green sheets may be determined so as to have an appropriate thickness for the layers 8 and 10, and the materials of the layers 1, 6, 8, and 10 other than the dielectric layer 3 of the capacitor section 5 are as follows. Not limited to a dielectric, an insulator may be used. Adjustment of the resonance frequency can be performed by breaking the lowermost protective layer 1 and trimming the electrode 2, and can be set to a desired value.

In the above embodiment, the terminal electrodes are formed on the opposing side surfaces (including the upper and lower surfaces) of the laminate. However, the present invention is not limited to this. 5 and the electrode of the coil section 7 may be connected.

In the above embodiment, the shield electrode 9 is provided. However, in the present invention, the electrode 9 may be omitted.

Effects of the Invention As described in detail above, in the case of the present invention, it is possible to configure a parallel resonance circuit having a three-dimensional structure in which a capacitor portion and a coil portion in the thickness direction of the laminate are connected to terminal electrodes, Since the size can be reduced and the terminal electrodes formed on the side surfaces of the stacked body can be used as external connection terminals, an excellent effect that surface mounting is possible is achieved.

Since the electrode pair of the capacitor and the electrode of the coil are inevitably parallel to each other, there is virtually no interaction between the current flowing during charging and discharging of the capacitor and the magnetic field lines of the current flowing through the coil. This also has the effect of improving

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the resonator according to the present invention, FIG. 2 is a sectional view showing an integrated state of the resonator, and FIG. 3 is an external view showing a side surface of the resonator. FIG. 4 is a plan view showing a conventional resonator, FIG. 5 is a cross-sectional view taken along line VV of FIG. 4, and FIG. 6 is an equivalent circuit diagram of the resonator. 5: Capacitor part 2,4 ... Electrode 2a, 4a ... Electrode extraction part 6 ... Intermediate layer 7 ... Electrode (coil part) 7a, 7b ... Electrode extraction part 11 ... Laminated body 11c, 11d ... Side 12,13 ... Terminal electrode.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Taniguchi 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Co., Ltd. Inside Murata Manufacturing Co., Ltd. (72) Ken Tonegawa 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Co., Ltd. (56) References JP-A-58-145114 (JP, A) JP-A-56-33813 (JP, A) JP-A 62-44522 (JP, U) JP-A 60-28113 ( JP, Y2)

Claims (1)

(57) [Claims] 1. A resonator having an equivalent circuit in which a capacitor and a coil are connected in parallel, comprising a laminated body in which dielectric sheets of the same material and of the same shape are laminated such that all outer edges overlap. A capacitor portion composed of a pair of electrodes facing each other with a layer interposed therebetween, and a coil portion composed of a strip-shaped electrode formed on the same plane on one dielectric sheet are formed of a dielectric sheet therebetween. It is thicker than between the electrodes, reduces the electromagnetic influence on the capacitor, is laminated via an intermediate layer, and on one side surface of the laminate, the end of one electrode of the capacitor portion, and the electrode of the coil portion The end of the other end of the capacitor portion and the end of the electrode of the coil portion were drawn out on the side surface opposite to the one side surface of the laminate, and were drawn out on each side surface of the laminate. Con A strip-shaped terminal electrode connected to each end of the electrode of the sensor part and the electrode of the coil part, the width of which is wider than the end of the electrode of the coil part, and the width of which is smaller than the side surface of the laminated body, is parallel to each other. A resonator formed on each of the side surfaces.