JPS6324658Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ceramic oscillator that combines a ceramic piezoelectric resonator and a plate-shaped capacitor.

The most common oscillator at present is a crystal resonator, and it is known that oscillators using this crystal resonator have good frequency stability. However, crystal resonators are relatively expensive.

In view of the above points, the present invention aims to provide a ceramic resonator with a simple structure, easy assembly, and low cost that can be used as a substitute for a crystal resonator in applications where frequency stability is not so strictly required. be.

Embodiments of the ceramic oscillator according to the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention. In these figures, inside the box-shaped metal case 1, there are a plate capacitor 2A, an elastic metal terminal with a lead 3A, an elastic fitting 4A, a ceramic piezoelectric resonator 5,
The elastic metal fittings 4B, the elastic metal terminals with leads 3B, and the plate capacitors 2B are housed in a stacked state, and the elastic metal terminals with leads 3A and 3B are held by the insulating spacer 6 fitted into the opening of the metal case 1. It is held fixed. Here, the plate capacitors 2A, 2B and the ceramic piezoelectric resonator 5 have electrodes on both end faces, and the metal terminals 3A, 3B and the metal fittings 4A, 4B have a protrusion 7 at the center so as to be in pressure contact with each electrode. are doing. Furthermore, due to the elasticity of each terminal and metal fitting, one electrode of the plate capacitors 2A, 2B is in close contact with the inner surface of the metal case 1. Incidentally, an earth lead terminal 8 is integrally formed in the metal case 1, and the ends of the leaded elastic metal terminals 3A and 3B are drawn out to the outside of the case as lead terminals 9A and 9B.

FIG. 4 shows an example of an oscillator using the ceramic oscillator shown in the first embodiment. In this figure, a ceramic resonator 10 has a ceramic piezoelectric resonator 5 electrically connected between lead terminals 9A and 9B, and a ceramic piezoelectric resonator 5 electrically connected between lead terminals 9A and 9B and a metal case 1, that is, a ground lead terminal 8. It is represented by connected plate-shaped capacitors 2A and 2B, lead terminals 9A and 9B are connected to the input and output terminals of an amplifier 20, respectively, and an earth lead terminal 8 is grounded. In addition, a resistor 2 is connected between the input and output of the amplifier 20.
1 is connected to the output side of the amplifier 20, and the amplifier 2 is connected to the output side of the amplifier 20.
2 is connected, and the output of this amplifier 22 is led out to an output terminal 23. The power supply terminal 24 has a power supply voltage.
Vcc is now supplied.

The operation of the oscillator shown in FIG. 4 is similar to that of a crystal oscillator, and the oscillation frequency is almost determined by the characteristics of the ceramic piezoelectric resonator 5. The usable frequency range of this oscillator is practically about 190 kHz to 1 MHz, and the resistor 21 can be 1 MΩ, and the plate capacitors 2A and 2B can be about 100 pF to 470 pF.

As explained above, according to the first embodiment, the metal case 1 serves as a case for accommodating the ceramic piezoelectric resonator 5 and the plate capacitors 2A and 2B.
Since one electrode of the capacitors 2A and 2B is in contact with the metal case 1, wiring inside the case is not required, the structure is simple, and the assembly work is easy. Can be done. Moreover, there is no disconnection accident, and the connection between the resonator 5, the capacitors 2A and 2B, and the case 1 can be maintained reliably.

FIG. 5 shows a second embodiment of the invention. In this figure, there is a plate capacitor 2 inside the metal case 1.
A, an elastic metal terminal with a lead 30A, a ceramic piezoelectric resonator 5, an elastic metal terminal with a lead 30B, and a plate capacitor 2B are housed in a stacked state, and the elastic metal terminals with leads 30A and 30B are placed in the opening of the metal case 1. It is held and fixed by an insulating spacer 6 fitted into the section. Here, the leaded elastic metal terminals 30A and 30B are connected to the resonator 5.
It has a protrusion 31 that comes into pressure contact with the electrode of the plate-shaped capacitors 2A, 2B, an elastic support part 32 that comes into pressure contact with the electrode of the plate-shaped capacitors 2A, 2B, and a lead terminal 33. Note that the other configurations are the same as those of the first embodiment described above.

According to the second embodiment, the resonator 5 and the plate capacitor 2 are connected to each other by the leaded elastic metal terminals 30A and 30B.
A and 2B can be connected, and the structure can be further simplified.

FIG. 6 shows a third embodiment of the present invention. In this figure, inside the metal case 1, an elastic metal fitting 4C, a plate capacitor 2A, an elastic metal fitting 4A, an elastic metal terminal with a lead 3A, a ceramic piezoelectric resonator 5, an elastic metal terminal with a lead 3B, an elastic metal fitting 4B, a plate-shaped The capacitor 2B and the elastic fitting 4D are accommodated in a stacked state. Note that the other configurations are the same as those of the first embodiment described above, and the functions and effects are also substantially the same as those of the first embodiment.

Note that it is clear that an adhesive or the like can be used in conjunction with the plate capacitor or the leaded elastic metal terminal as appropriate.

As described above, according to the present invention, a ceramic oscillator having a simple structure, which is easy to assemble, and which is low in cost can be obtained.

[Brief explanation of the drawing]

Figure 1 shows the first ceramic oscillator according to the present invention.
A vertical cross-sectional view showing the embodiment, FIG. 2 is a perspective view, and FIG.
4 is a circuit diagram of an oscillator configured using the ceramic oscillator of the first embodiment. FIG. 5 is a vertical sectional view showing the second embodiment of the present invention. FIG. 6 is a longitudinal sectional view showing a third embodiment of the present invention. 1...Metal case, 2A, 2B...Plate capacitor, 3A, 3B, 30A, 30B...Elastic metal terminal with lead, 4A to 4D...Elastic fitting, 5...
...Ceramic piezoelectric resonator, 6...Insulating spacer,
7...Protrusion, 8...Earth lead terminal, 9A, 9
B...Lead terminal, 10...Ceramic resonator.

Claims (1)

[Scope of utility model registration request] A first plate capacitor, a ceramic piezoelectric resonator, and a second plate capacitor are stacked in a box-shaped metal case, and one electrode of the first and second plate capacitors is attached directly to the metal case or by an elastic metal fitting. between the electrode of the resonator and the other electrode of the first and second capacitors, an elastic metal terminal with a lead having a protrusion that presses into contact with either electrode is provided. A ceramic oscillator characterized in that the elastic metal terminals with leads are held and fixed by insulating spacers fitted into openings of the box-shaped metal case.