JPH0238492Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to piezoelectric resonators, and more particularly to integrating piezoelectric resonators with other circuit components.

FIG. 1 is a plan view of a conventional piezoelectric resonator.
FIG. 2 is a plan view of the piezoelectric resonator covered with resin. Piezoelectric resonator 1 shown in these figures
Here, first and second resonator electrodes 5 and 6 are formed on both main surfaces 3 and 4 of piezoelectric substrate 2, respectively. Both resonator electrodes 5 and 6 are formed facing each other with the piezoelectric substrate 2 in between. The first resonator electrode 5 is connected to an extraction electrode 7 formed to extend to one end of one main surface 3 of the piezoelectric substrate 2 . The second resonator electrode 6 is connected to an extraction electrode 8 formed to extend to one end of the other main surface 4 of the piezoelectric substrate 2 .
Each of the lead electrodes 7 and 8 is formed wide at one end of the main surfaces 3 and 4 for connecting a lead terminal, and the lead terminals 11 and 12 are soldered to the wide lead electrode portions 9 and 10. Fixed by
After the lead terminals 11 and 12 are fixed, the piezoelectric substrate is covered with resin 13 as shown in FIG. by the way,
Such a piezoelectric resonator 1 may be used in an oscillation circuit 14 as shown in FIG. In FIG. 3, 15 is an inverter, 1 is the piezoelectric resonator, 1
6 and 17 are first and second capacitors serving as load capacitances. Conventionally, when the piezoelectric resonator 1 is used in such an oscillation circuit 14, it has been manufactured separately from the first and second capacitors 16 and 17. Therefore, the oscillation frequency of the oscillation circuit 14 depends on the capacitance values of the first and second capacitors 16 and 17 as load capacitances, the resonance frequency of the piezoelectric resonator 1, and variations in the internal circuit constants of the inverter 15. The structure is subject to change. When the oscillation circuit 14 of FIG. 3 is used as an oscillation clock source for a computer or the like, it is preferable that such fluctuations be as small as possible. Furthermore, if the parts are manufactured separately, the number of parts increases and the size becomes large, which is also undesirable from the viewpoint of parts management.

The present invention enables, for example, when a piezoelectric resonator is used as an oscillation element in an oscillation circuit, variations in the oscillation frequency of the oscillation circuit to be minimized, reduces the number of components, and downsizes the resonator.
The purpose is also to facilitate parts management.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 4 is a plan view of the piezoelectric resonator of this embodiment. The piezoelectric resonator 20 of this embodiment is of an energy trap type thickness longitudinal vibration mode. This piezoelectric resonator 20 includes a piezoelectric substrate 21 . First and second resonator electrodes 24 and 25 are formed on both main surfaces 22 and 23 of this piezoelectric substrate 21, facing each other with the piezoelectric substrate 21 in between. First and second capacitor electrodes 2 constituting the first capacitor 26 are arranged along one end of one main surface 22 of the piezoelectric substrate 21 on which the first resonator electrode 24 is formed.
The first capacitor electrode 27 of the capacitors 7 and 28 is connected to the first resonator electrode 24 via the lead electrode 29, and the third and fourth capacitor electrodes 31 and 32 constituting the second capacitor 30 A third capacitor electrode 31 is formed. A slit S is formed in a corner 33 at one end of the other main surface 23 of the piezoelectric substrate 21 on which the second resonator electrode 25 is formed. Around this slit S, the first connection electrode 34 is connected to the second resonator electrode 25 and the extraction electrode 3 is connected to the second resonator electrode 25.
5 and are formed by connecting through. Similarly, on the other main surface 23, a second capacitor electrode 28 is formed opposite to the first capacitor electrode 27, and a fourth capacitor electrode 32 of the second capacitor 30 is formed opposite to the third capacitor electrode 31. At the same time, the second and fourth capacitor electrodes 28 and 32 are connected to each other via the second connection electrode 36.
The first and second capacitors 26 and 30 are formed by terminally polarizing the portions of the piezoelectric substrate 21 on which the capacitors 26 and 30 are formed, or by soldering capacitor electrodes. A third connecting electrode 37 is formed around the slit S on one main surface 22 side facing the corner 33 and connected to the third capacitor electrode 31 via a lead electrode 38. In such a configuration, the first and third connection electrodes 34, 37 are connected to each other by a conductive paint 39 applied within the slit S, as shown in FIGS. 5 and 6. FIG. 5 is a plan view of such a piezoelectric resonator 20 viewed from the same direction as FIG. 4, and in FIG. The first and second lead terminals 40 and 41 of the solder 4
The connection is fixed by 2 and 43. FIG. 6 is a plan view of the piezoelectric resonator 20 viewed from the opposite direction to that shown in FIG.
A third lead terminal 44 for grounding is also connected and fixed by solder 45 to the second connection electrode 36 that connects the capacitor 8 and the fourth capacitor electrode 32 . Therefore, according to this embodiment, the piezoelectric resonator 20 and the two capacitors 1 in FIG. 3 are mounted on one piezoelectric substrate 21.
6, 17 (numerals 26, 3 in Figures 4 to 7)
0) are formed in accordance with the connection configuration shown in FIG. 3, making it possible to integrate circuit components. Note that if the first and third connection electrodes 34 and 37 are connected with conductive paint through the side end surface of the piezoelectric substrate 21 without providing the slit S, the conductive paint will protrude from the side end surface, so it will be difficult to The conductive paint may chip due to contact, resulting in poor reliability. That point,
In the present invention, since there is a slit S, the connection part is located at a place that extends inside from the side end face, and there is no fear of chipping due to contact during processing. Furthermore, the conductive cross-sectional area of the conductive paint becomes larger. Therefore, the presence of the slit S improves reliability.

As described above, according to the present invention, first and second resonator electrodes are formed on both main surfaces of the piezoelectric substrate 21, facing each other with the piezoelectric substrate in between, and the first resonator electrode is formed. A first capacitor and a second capacitor constituting a first capacitor are arranged along one end of one main surface of the piezoelectric substrate.
The first capacitor electrode of the capacitor electrodes is the first capacitor electrode.
A piezoelectric material is formed by being connected to the resonator electrode via an extraction electrode, and also forms the third capacitor electrode of the third and fourth capacitor electrodes constituting the second capacitor, and the second resonator electrode is formed. A first connection electrode is connected to a second resonator electrode via an extraction electrode at a corner of one end of the other main surface of the substrate, and a first capacitor electrode is also formed on the other main surface. A second capacitor electrode is formed opposite to the third capacitor electrode, and a fourth capacitor electrode of the second capacitor is formed opposite to the third capacitor electrode, and the second and fourth capacitor electrodes are connected to each other via a second extraction electrode. A third connection electrode is formed on the other main surface facing the corner by connecting it to the third capacitor electrode via an extraction electrode, and further,
A slit is provided in the corner, and the first and third connection electrodes are connected to each other by the conductive paint present in the slit, so that the reliability of this connection part is fully satisfied. For example, when a piezoelectric resonator is used as an oscillation element in an oscillation circuit, variations in the oscillation frequency of the oscillation circuit can be minimized, the number of components is reduced, the size is reduced, and component management is also improved. It can be easily done.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional piezoelectric resonator, FIG. 2 is a plan view of the piezoelectric resonator shown in FIG. 1 covered with resin, FIG. 3 is an oscillation circuit diagram including the piezoelectric resonator, and FIG.
6 to 6 show embodiments of the present invention, FIG. 4 is a plan view of the piezoelectric resonator, and FIG. 5 is a piezoelectric resonator provided with solder, conductive paint, and lead terminals. FIG. 6 is a plan view similar to FIG. 5, but viewed from the opposite direction to the piezoelectric resonator in FIG. 4. 20 is a piezoelectric resonator, 21 is a piezoelectric substrate, 22, 2
3 is the main surface, 24 is the first resonator electrode, 25 is the second
Resonator electrode, 26 is the first capacitor, 27, 28
are first and second capacitor electrodes, 29 is an extraction electrode,
30 is the second capacitor, 31 and 32 are the first and second capacitors.
Capacitor electrode, 33 is a corner, 34 is a first connection electrode, 35 is an extraction electrode, 36 is a second connection electrode,
37 is a third connection electrode, 38 is an extraction electrode, 39 is a conductive paint, 40, 41, 44 are lead terminals,
42, 43, 45 are solder, S is slit.

Claims (1)

[Scope of utility model registration request] forming first and second resonator electrodes facing each other on both main surfaces of the piezoelectric substrate with the piezoelectric substrate in between;
A first capacitor electrode of the first and second capacitor electrodes constituting the first capacitor is drawn out to the first resonator along one end of one main surface of the piezoelectric substrate on which the first resonator electrode is formed. The other main part of the piezoelectric substrate is formed by being connected via an electrode, and also forms a third capacitor electrode of the third and fourth capacitor electrodes constituting the second capacitor, and the other main part of the piezoelectric substrate on which the second resonator electrode is formed. A first connection electrode is formed in a corner of one end of the surface, connected to a second resonator electrode via an extraction electrode, and a first connection electrode is formed on the other main surface, facing the first capacitor electrode. A second capacitor electrode and a fourth capacitor electrode of the second capacitor are formed opposite to the third capacitor electrode, and the second and fourth capacitor electrodes are connected to each other via a second extraction electrode, and the corner portion A third connection electrode is formed on the other main surface facing the third capacitor electrode by connecting it to the third capacitor electrode via an extraction electrode, and a slit is provided at the corner, and a conductive paint is placed inside the slit. A piezoelectric resonator in which the first and third connection electrodes are connected to each other.