JPS5813609Y2 - Atsudenshindoushinoondosouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature device that stabilizes the frequency-temperature characteristics of a piezoelectric vibrator by fixing a heating element to a container housing the piezoelectric vibrator.

As this type of technology, a piezoelectric vibrator temperature device as shown in FIG. 1 can be considered.

In the figure, a piezoelectric vibrator 1 is held by two support wires 2 and is composed of a first container 3 (a can 3 and a base 3°).

) is contained within.

A nickel-chromium wire 12 is wound around and fixed to the outer surface of the first container 3 as a heating element.

This first container 3 is further comprised of a second container 4 (can 4 and base 4°) having a larger volume.

) and planted at the base 3° of the first container 3.
The support line 2 of the book is attached to the base 42 of the second container 4.
It is held by being connected and fixed to the lead-out terminal 6 of the book by soldering.

Further, the nickel chromium wire 12 and the temperature storage element 5 (an element whose resistance value changes rapidly depending on temperature) are also included.

) are connected to lead-out terminals 7 and 8 implanted in the base 4°.

The piezoelectric vibrator temperature device configured in this way connects the nickel chrome wire 12 and the lead terminals of the temperature sensing element 5 to an external temperature control circuit to maintain a constant internal temperature of the first container 3. However, despite the main objectives of (1) reducing the power consumption of the heating element and (2) improving the frequency stability of the piezoelectric vibrator with respect to ambient temperature, it has the following drawbacks.

Since the can 3 of the piezoelectric vibrator 1 is heated by the nickel-chromium wire 12, the piezoelectric vibrator 1 receives radiant heat from the can 3 and is kept warm.

Two supports 2 (metal) that always hold the piezoelectric vibrator 1
It conducts to the extraction terminal 6 and the second container through the terminal.

Therefore, the power consumption of the nickel-chromium wire 12 cannot keep the piezoelectric vibrator 1 warm with the amount of power required to keep it warm, so it is forced to be more than necessary.

In addition, the piezoelectric vibrator 1 is also affected by the ambient temperature through the heat conduction path described above, so that the frequency stability cannot be improved as expected.

Furthermore, the gas inside each of the first container 3 and the second container 4 is
I am undecided as to what kind to choose, but the first container 3
If the inside of the piezoelectric vibrator 1 is sealed in a vacuum, the piezoelectric vibrator 1 may receive radiant heat, causing thermal distortion and frequency fluctuation.

This frequency fluctuation is due to thermal distortion and cannot be compensated for.

Therefore, the gas inside each of the first container 3 and the second container 4 must be selected so that it does not cause thermal distortion even if radiant heat is applied to the piezoelectric vibrator 1.

The present invention was developed to solve the above-mentioned problems, and its purpose is to significantly reduce the power consumption of the heating element and improve the frequency stability of the piezoelectric vibrator with respect to ambient temperature. The present invention provides a piezoelectric vibrator temperature device.

In order to achieve such an object, the present invention provides a temperature device in which a piezoelectric vibrator is housed in a first container to which a heating element is fixed, and the first container is housed in a second container. A support wire of the piezoelectric vibrator pulled out from the first container is connected to a lead-out terminal of the second container via a holder made of a thermally insulating material to which a first isoelectric film is fixed, and A temperature device for a piezoelectric vibrator, characterized in that the second container is sealed with an inert gas and the second container is sealed with a vacuum.
Ru.

Here, "heating element" refers to resistors such as nickel chromium and copper nickel, solid resistors, and metal thin film resistors.

It is a heating element due to the collector loss of a transistor and a resistor such as a resistor (product name POSISTOR) with a positive temperature coefficient.
What is a "piezoelectric vibrator"? It vibrates by placing an excitation electrode on a piezoelectric material such as crystal, piezoelectric ceramic, or lithium tantalate, and applying a resonant electric field to the excitation electrode.
What is "conductive film"?

It is a film of a material with high electrical conductivity such as gold, silver, copper, and nickel, and a "thermal nonconductor" is a material with low thermal conductivity such as ceramic or glass.

The present invention will be described below with illustrations of embodiments.

FIG. 2 is a perspective view showing a temperature device for a crystal resonator, which is an embodiment of the present invention.

In the figure, a crystal resonator 1 is held by two support wires, and is composed of a first container 3 (can 3 □ and a base 32 ) having the size of HC-18/U.

) is contained within. This first container 3 is filled with nitrogen gas as an inert gas.

The two supporting wires 2 are fixedly connected by soldering to a holder 9 which holds the first container 3 upside down and is fixed with gold by vacuum evaporation from a ceramic rod, and the other end of the holder 9 is attached to the first container 3. 2
Container 4 (composed of can 41 and base 4°).

) is firmly connected by soldering to two lead-out terminals 6 implanted in the base 42 of the base 42.

Note that the second container 4 has a size of HC-6/U.

For the heating element 12, a nickel chromium resistor is used.

First, an insulating film is formed on the outer surface of the can 3 □ of the first container 3, and then a thin nickel chromium resistive film is fixed on the insulating film by vapor deposition technology.

Gold is fixed to the connecting portion 10 of the heating element 12 by vapor deposition technique so that a soldered connection can be made.

The lead wire 11 is connected to the connecting portion 10 and the lead-out terminal 7 by soldering.

The temperature sensing element 5 is connected to the lead terminal 8.

Then, the second container 4 is vacuum-sealed and the can 4 □
is joined to the base 42 by cold welding technology.

The crystal resonator temperature device configured in this way controls the amount of heat generated by the heating element by connecting the lead terminals 7 and 8 of the heating element 12 and the temperature sensing element 5 to an external temperature control circuit. The internal temperature of the first container 3 is maintained at a constant temperature.

The power consumption, which is the problem solved by this invention, is expressed by the curve A drawn in the power consumption characteristic curve diagram shown in Figure 3, where the horizontal axis is the ambient temperature T (°C) and the vertical axis is the power consumption P (mw). has been done.

Note that the curve 0 drawn in the figure is a power consumption characteristic curve diagram for the temperature device shown in FIG.

As is clear from a comparison of curves A and B shown in Figure 3, the temperature device according to the present invention consumes approximately 1/3 or less power than the temperature device shown in Figure 1 at each ambient temperature. Yes, and 300mw at -10'C 11 at 200C
Temperature can be controlled with 0mW, which is unimaginable with conventional temperature devices that use heating elements.

On the other hand, 1-frequency stability is achieved by making the zero temperature coefficient temperature of the crystal oscillator almost the same as the internal temperature of the first container to reduce the ambient temperature to -10°.
When changing the temperature from C to 50°C, the rate of change in frequency was 0.1ppmJ! I was able to lower it.

In this respect as well, with conventional simple temperature devices, it was extremely difficult to reduce the frequency change rate to 1 ppm or less under the same conditions as above.

The temperature device according to the present invention has improved frequency stability by as much as one order of magnitude.

This is a holder consisting of a ceramic rod with a first container containing a crystal resonator filled with nitrogen gas, a second container containing the first container vacuum-sealed, and a gold conductive film adhered to it. Since the heat generating element fixed to the first container is interposed, the heat of the heating element fixed to the first container is evenly conducted to the crystal resonator, preventing the occurrence of thermal distortion, and suppressing heat conduction to the outside and dissipating the heat from the external surroundings. This means reducing the influence of temperature and improving frequency stability.

Thus, the temperature device according to the present invention can greatly reduce the power consumption of one heating element and improve the frequency stability of the piezoelectric vibrator, so it has great utility in this industrial field.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a temperature device for a piezoelectric vibrator considered for the purpose of reducing power consumption of a heating element. FIG. 2 is a perspective view showing a temperature device for a crystal resonator according to an embodiment of the present invention, and FIG. 3 is a power consumption characteristic curve diagram. 1...Piezoelectric vibrator, 2...Support wire, 3
...First container, 4...Second container, 9.
...Holding tool.

Claims (1)

[Scope of utility model registration request] A piezoelectric vibrator is housed in a first container to which a heating element is fixed,
In the temperature device in which the first container is accommodated in the second container, the support wire of the piezoelectric vibrator drawn out from the first container is attached to a holder made of a thermally nonconductive material to which a conductive film is fixed. connected to the lead-out terminal of the second container via the first
1. A temperature device for a piezoelectric vibrator, characterized in that the inside of the container is filled with an inert gas, and the inside of the second container is sealed with a vacuum.