JPH0728732Y2 - Oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an oscillator including a capacitor and a piezoelectric vibrating element.

[Conventional technology]

For example, as a clock pulse oscillator for a microcomputer, an oscillator with a built-in capacitor including two capacitors and one vibrator is used. As an oscillator with a built-in capacitor of this type, Japanese Utility Model Laid-Open No. 62-17230 discloses an oscillator in which a piezoelectric vibrating element is fixed on a dielectric substrate on which a pair of capacitors are formed. In this oscillator, an input electrode, an output electrode, and a ground electrode are formed on one main surface of a dielectric substrate, and a capacitance component is formed on the other main surface at a portion facing the ground electrode through the dielectric substrate. An input electrode and an output electrode are provided as obtained. Also,
The piezoelectric vibrating element is mounted on the main surface of the dielectric substrate on the side where only the input electrodes and the output electrodes are provided, and is connected to the input electrodes and the output electrodes. In this oscillator, a lid for covering the piezoelectric vibrating element is mounted on the dielectric substrate.

[Problems to be solved by the device]

In the manufacturing process of the conventional oscillator, the capacitance of the capacitor formed on the dielectric substrate is inspected. here,
Since the dielectric substrate on which the capacitor is formed has different electrode patterns on the main surfaces on both sides, it is necessary to determine the main surface of the substrate. That is, the capacitance test is usually performed by contacting the two measuring pins between the input electrode and the ground electrode or between the output electrode and the ground electrode. In such a capacitance measurement, the ground electrode is provided. It is necessary to set the substrate so that the main surface on the side faces the measurement pin. Also,
When fixing the piezoelectric vibrating element on the substrate, it is necessary to determine the main surface of the substrate. That is, the voltage oscillating element must be fixed on the main surface on the side where the ground electrode is not provided, and therefore its determination is necessary.

As described above, the conventional oscillator requires the determination of the main surface of the dielectric substrate in the manufacturing process, which makes the work complicated and increases the manufacturing cost.

An object of the present invention is to provide an inexpensive oscillator that can be easily manufactured at low cost.

[Means for Solving the Problems]

The oscillator of the present invention comprises a dielectric substrate and a piezoelectric vibrator. The dielectric substrate is electrically connected to each other through the side surface of the substrate,
And each has an input electrode, an output electrode and a ground electrode formed in the same conductor pattern on both main surfaces, and constitutes a capacitor component between the input electrode and the ground electrode, between the output electrode and the ground, An input electrode and an output electrode formed on one main surface side are used as connection electrodes for the piezoelectric vibrating element, and an input electrode, an output electrode, and a ground electrode formed on the other main surface side are used as terminal electrodes. The piezoelectric vibrating element is directly connected to an input electrode and an output electrode on one main surface of the dielectric substrate via a conductive adhesive.

[Action]

According to the present invention, the input electrode, the output electrode and the ground electrode formed on both main surfaces of the substrate have substantially the same pattern between the both main surfaces. Therefore, in the oscillator manufacturing process of the present invention, for example, when fixing the piezoelectric vibrating element on the substrate, it is not necessary to determine the main surface of the substrate. Further, the piezoelectric vibrating element is arranged and fixed on the dielectric substrate, and the dielectric substrate is such that the input electrode and the output electrode on one main surface on the piezoelectric vibrating element side are electrically connected to the piezoelectric vibrating element, and the other. Each electrode on the main surface of is connected to an external circuit or the like, and the connection structure is simplified as an oscillation component. As a result, the oscillator of the present invention can be manufactured more easily and can be provided at a lower cost than the conventional oscillator.

〔Example〕

1 and 2 show an embodiment of the oscillator of the present invention. FIG. 1 is a side view of the oscillator. FIG. 2 is a plan view of the oscillator. Note that the lid 4 is shown by a broken line for the sake of explanation.

In the figure, an oscillator 1 includes a dielectric substrate 2, a piezoelectric vibrating element 3 fixed on the dielectric substrate 2, and a lid 4 that covers the piezoelectric vibrating element 3 on the dielectric substrate 2.

The dielectric substrate 2 (hereinafter, simply referred to as a substrate) is made of a dielectric ceramic material such as barium titanate, lanthanum titanate, calcium titanate, or alumina, and has a flat plate shape. As shown in FIG. 3A, on the upper surface, which is one main surface of the substrate 2, input electrodes extending in the width direction are formed in the vicinity of both ends in the longitudinal direction.
21a and an output electrode 23a are provided. Also, the input electrode
Between the input electrode 21b and the output electrode 23a, a ground electrode 22a is provided between the input electrode 21b and the output electrode 23a at intervals X and Y, respectively. Further, on the lower surface which is the other main surface of the substrate 2,
As shown in FIG. 3B, the input electrode 21a and the output electrode 23b are provided at positions facing the input electrode 21a and the output electrode 23a provided on the upper surface of the substrate 2, respectively. A ground electrode 22b is provided between the input electrode 21b and the output electrode 23b at a position facing the ground electrode 22a provided on the upper surface of the substrate 2. That is, the ground electrode 22b is provided at intervals X and Y from the input electrode 21b and the output electrode 23b, respectively. Therefore, the substrate 2 is provided with three strips of electrodes in the same pattern on both main surfaces. The input electrodes 21a, 21b thus formed on the substrate 2
Between the output electrodes 23a and 23b, and between the ground electrodes 22a and 22b,
Conduction is performed by semi-cylindrical conductor portions 21c, 22c and 23c provided on both side surfaces of the substrate 2 (FIG. 1).

In such a substrate 2, a capacitor between the input electrodes 21a, 21b and the ground electrodes 22a, 22b, and between the output electrodes 23a, 23b and the ground electrodes 22a, 22b is used as a capacitance between the surface electrodes of the substrate 2, respectively. Is configured.

The piezoelectric vibrating element 3 is composed of a flat piezoelectric substrate 31 made of a piezoelectric ceramic material, and vibrating electrodes 32a and 32b provided on both main surfaces of the piezoelectric substrate 31, respectively. (Fig. 1). The vibration electrode 32a provided on the upper main surface of the piezoelectric substrate 31 extends from the left end of the piezoelectric substrate 31 in the drawing toward the center. On the other hand, the vibration electrode 32b on the lower main surface of the piezoelectric substrate 31 extends from the right end of the piezoelectric substrate 31 in the figure toward the center. The central portion of the piezoelectric substrate 31 of these vibrating electrodes 32a, 32b is the piezoelectric substrate 3
They face each other through 1 and form a resonator. In such a piezoelectric vibrating element 3, the vibrating electrode 32b is the output electrode 23a of the substrate 2.
It is arranged on the substrate 2 so as to face with. The piezoelectric vibrating element 3 has the input electrodes 21a and the output electrodes at both ends in the longitudinal direction by the conductive adhesives 33a and 33b, respectively.
It is fixed at 23a. As a result, the vibrating electrode 32a is connected to the input electrode 21a of the substrate 2, and the vibrating electrode 32b is connected to the output electrode 23a.

The lid 4 is made of an electrically insulating material such as ceramic or resin. The lid 4 is attached so as to cover the entire upper surface of the substrate 2. The lid 4 and the substrate 2 are adhered to each other with a connecting agent, whereby the inside of the lid 4 is hermetically sealed.

According to such an oscillator 1, between the input electrodes 21a and 21b and the ground electrodes 22a and 22b, and between the output electrodes 23a and 23b and the ground electrodes.
An oscillator having two capacitors and one resonator between 22a and 22b can be obtained. An equivalent circuit of such an oscillator 1 is shown in FIG. In this oscillator 1, the terminals T ₁ and T _{2 are}
And the resonator R is disposed between and. And the resonator R
A pair of capacitors C ₁ and C ₂ are arranged between the input / output electrodes of the above and the grounding terminal G. In FIG. 4, capacitors C ₁ and C ₂ are capacitors and output electrodes 2 composed of an input electrode 21a and a ground electrode 22a.
It corresponds to a capacitor composed of 3a and the ground electrode 22a. Further, the resonator R corresponds to the resonator constituted by the piezoelectric vibrating element 3.

According to the oscillator 1 of this embodiment, a Colpitts oscillator circuit is constructed by connecting an inverter and a feedback resistor between the terminals T ₁ and T ₂ , that is, between the input electrode 21b and the output electrode 23b. You can

The oscillator 1 according to the present embodiment has capacitors C ₁ , C
The capacity of ₂ can be easily adjusted to a desired value. This can be realized by adjusting the distance X between the input electrodes 21a, 21b of the substrate 2 and the ground electrodes 22a, 22b and the distance Y between the output electrodes 23a, 23b and the ground electrodes 22a, 22b.

In addition, since the input electrode 21a, the output electrode 23a, and the ground electrode 22a are formed by printing on the main surface of the substrate 2 using the same plate-making mask, the intervals X and Y do not change even if some printing misalignment occurs. In the oscillator 1 of this embodiment, which can obtain a stable capacitance, three electrodes are formed in the same pattern on both main surfaces of the substrate 2. Therefore, the substrate 2
The capacitance of the capacitor configured as described above can be measured from any of the main surfaces of the substrate 2. Further, the piezoelectric vibrating element 3 can be fixed in the same state on any main surface of the substrate 2. Therefore, the oscillator 1 of the present embodiment
Then, since it is not necessary to determine the main surface of the substrate 2, the manufacturing process can be simplified. As a result, the oscillator 1 of this embodiment can be provided at low cost.

[Other Examples]

(A) In the above-described embodiment, the electrodes are provided in the same pattern on both main surfaces of the substrate 2, but the present invention is not limited to this. That is, the patterns of the electrodes provided on both main surfaces of the substrate 2 may be substantially the same. For example, each electrode on one main surface may be narrower than each electrode on the other upper surface.

(B) In the above-described embodiment, each electrode on one main surface and each electrode on the other main surface are electrically connected by the semi-cylindrical conductive portion on the end surface, but instead of this, a flat end surface-shaped conductive portion is used. It may be conducted.

[Effect of device]

In the present invention, the electrodes formed on both main surfaces of the substrate have substantially the same pattern between both main surfaces. Therefore, according to the present invention, it is not necessary to determine the main surface of the substrate during manufacturing, and the manufacturing process can be simplified. As a result, the composite electronic component of the present invention can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a plan view of an embodiment of the present invention, and FIGS. 3A and 3B are plan and bottom views of a substrate used in the embodiment, respectively. FIG. 4 is a diagram showing an equivalent circuit of the above embodiment. 2 ... Substrate, 3 ... Piezoelectric vibration element, 21a, 21b ... Input electrode, 22a, 22b ... Ground electrode, 23a, 23b ... Output electrode.

Claims (1)

[Scope of utility model registration request] 1. An input electrode, an output electrode, and a ground electrode, which are electrically connected to each other through a side surface of a substrate and are formed on the both main surfaces with the same conductor pattern, respectively, and between the input electrode and the ground electrode. A capacitor component is formed between the output electrode and the ground electrode, and the input electrode and the output electrode formed on one main surface side are used as connection electrodes for the piezoelectric vibrating element, and the other main surface side is formed. A dielectric substrate formed by using the input electrode, the output electrode and the ground electrode as terminal electrodes, and directly connected to the input electrode and the output electrode on one main surface of the dielectric substrate via a conductive adhesive. An oscillator consisting of a piezoelectric vibrating element.