JP2003229507A - Electronic part container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container structure having adiabatic and exothermic effects for acquiring stable oscillation characteristics of an oscillator provided by adding an oscillating circuit to a piezoelectric (quartz) vibrator and an elastic surface wave element, etc. <P>SOLUTION: Related to an electronic part container for housing an electronic part in an airtight container structure, the electronic part container comprises a material having an adiathermic and exothermic structure. To cite an example of the container structure, a lamination structure from the inside toward the outside of the container comprises a layer having a heating effect, a layer having the adiabatic effect, a layer having a heat-retaining effect and a layer having the adiabatic effect. The heating effect is realized with a ceramic heating resistor. The adiabatic effect and the heat-retaining effect are realized in the lamination structure of a dense ceramic material and a porous ceramic material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to stable oscillation of an oscillator in which a piezoelectric (quartz) oscillator, a surface acoustic wave device or the like is housed, or an oscillator circuit is added to the piezoelectric (quartz) oscillator or surface acoustic wave device. The present invention relates to a container structure having a heat insulating or heat generating effect for the purpose of characteristics.

[0002]

2. Description of the Related Art As a piezoelectric oscillator such as a crystal oscillator, which is a frequency control device used in mobile communication equipment and transmission communication equipment, a constant temperature oven capable of outputting a highly stable frequency without being affected by an external temperature change. Type piezoelectric oscillators are conventionally known. Further, in recent years, as precision electronic devices and portable mobile devices have been miniaturized, various devices are required to be small and lightweight and portable in these fields. In addition, there is an increasing demand for high-precision oscillators with stable oscillation frequencies.

Against this background, there is a demand from the market for a thermostat-type piezoelectric oscillator to be smaller and lighter.
That is, the outer shape (especially height) of a conventional constant temperature oven type piezoelectric oscillator that has been conventionally used is usually about 20 to 30 mm, and a large one is often used in view of the recent mainstream oscillator shape. There is. However, in recent years, in response to the miniaturization of various devices, it is possible to reduce the height of thermostatic chamber piezoelectric oscillators to the same height as other large electronic components mounted on the circuit board that constitutes a set product. There is a strong demand.

Further, in the thermostatic chamber type piezoelectric oscillator,
By limiting the ambient temperature of the crystal unit, which is the heart of the oscillator, within the operating environment temperature (low temperature −30 ° C. to high temperature + 85 ° C.) of the oscillator, the amount of frequency fluctuation with respect to temperature is strictly suppressed.
Since it is necessary to maintain the ambient temperature of the crystal unit in a high temperature environment, since the heating means (heater) is provided in the thermostat-type piezoelectric oscillator, the oscillator itself requires large power. These days,
In addition to miniaturization and height reduction of oscillators, there is also a strong demand for a reduction in oscillator power consumption.

[0005]

As described above, the recent piezoelectric oscillator has a dimension of 7.0 mm length × 5.0 mm width × height 2.
Even the size of 5 mm is currently in the category of large external dimensions. Compared with this, the conventional oven-type piezoelectric oscillator has a very large shape and size, and in addition, since the frequency fluctuation amount with respect to the temperature characteristic of the crystal unit in the oven-controlled piezoelectric oscillator is suppressed, a heater is installed in the oscillator. Because it is necessary to keep the crystal unit in a high temperature environment permanently,
It is difficult to keep the power consumption of the oscillator low.

[0006]

In order to solve these problems, in order to solve these problems, the temperature distribution around the piezoelectric vibrator is stabilized or the piezoelectric vibrator is forcibly forced by the same principle as in the constant temperature oven type piezoelectric oscillator. An object of the present invention is to provide an electronic component container that realizes a constant temperature bath type oscillator that is close to the external dimensions of a recent mainstream oscillator that is mounted on portable mobile devices and home electric appliances while having a means for warming.

Therefore, the present invention relates to an electronic component container in which electronic components are housed inside a closed container structure, characterized in that the structure of the container is made of a material having a heat insulating treatment and a heating element structure. is there. As an example of the container structure, a laminated structure composed of a layer having a heating effect, a layer having a heat insulating effect, a layer having a heat retaining effect, and a layer having a heat insulating effect from the inside of the container toward the outside of the container. The heating effect is realized by the ceramic heater, the heat retaining effect is realized by the dense ceramic material, and the heat insulating effect is realized by the porous ceramic material. The greatest feature of the present invention is that the size of the oscillator container, which is currently mainstream, is 7.0 mm in length.
It is an electronic component container having a lateral capacity of 5.0 mm and a height of 2.5 mm and a capacity of 0.09 cc or less.

As described above, the external dimensions of the conventional thermostatic oven type piezoelectric oscillator are greatly reduced, and the container capacity is 0.09 cc.
By the following, it is possible to stabilize the temperature distribution around the piezoelectric vibrator and obtain the oscillation frequency with high accuracy by the same principle as that of the thermostat-type piezoelectric oscillator.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, in each figure, the same reference numerals denote the same objects. FIG. 1 is a side view showing an embodiment of the present invention, and is drawn as a partial cross section to suggest an internal structure. In FIG. 1, a crystal oscillator or a surface acoustic wave element is accommodated as the oscillator, and details thereof are not particularly shown.

The closed container structure shown in FIG. 1 has a layer 2 having a heating effect, a layer 3 having a heat insulating effect, a layer 4 having a heat retaining effect, and a heat insulating effect from the inside of the container 1 toward the outside of the container 1. It is a laminated structure composed of layers 3, and as one example thereof, the heating effect is realized by a ceramic heater, the heat retaining effect is realized by a dense ceramic material, and the heat insulating effect is realized by a porous ceramic material. In short, the heat retaining effect and the heat insulating effect are brought about by the synergistic action of the dense ceramic material and the porous ceramic material. Therefore, it is characterized by having a laminated container structure of a quadruple structure covering almost the entire inner wall of the container 1. By adopting such a quadruple structure, the influence of temperature change from the outside of the container is blocked, and the effect of preventing the temperature decrease from the inside of the container is also transmitted, so that it is transmitted from the inside of the container 1 to the outside of the container 1. By stabilizing the temperature change over time, the amount of temperature change exerted on the piezoelectric (quartz) vibrator or surface acoustic wave element housed in the container 1 is reduced, and a form very similar to that of the conventional thermostatic chamber type piezoelectric oscillator is obtained. It is a thing.

The size of the container 1 shown in FIG.
Although it is shown in the perspective view of FIG. 1, it suggests an example in which the total volume of the container 1 is reduced to 0.09 cc or less by calculating from the dimensions of length × width × height. Although it is difficult for the container structure of the present invention to satisfy the same temperature compensation as the original thermostatic oven type piezoelectric oscillator, by embedding the ceramic heater layer in the laminated structure forming the container 1, the conventional thermostat type piezoelectric oscillator can be obtained. Similar to the oscillator, it has the effect of keeping the operating environment temperature in the container 1 at a high temperature (about 90 ° C.). The electrical connections for driving the ceramic heater are not shown.

As described above, by realizing the container structure for maintaining the temperature environment inside the container 1 according to the present invention, it is possible to obtain a thermostat-shaped container 1 which is unprecedented in size and can be made low in height. . In the present embodiment, it is considered that the vibrating element is housed in the container 1 as a priority, but it goes without saying that the configuration of the oscillator can be realized by configuring it together with the oscillation circuit, and further, the temperature sensing element for controlling the temperature. By storing the (control circuit) inside the container 1, it is possible to manage the temperature control more finely. Note that the power consumption of the oscillator itself can be reduced when the present invention is used in the form of an oscillator by making the container 1 itself extremely small and using a ceramic heater as the heating means.

In the above-described embodiment, the container structure is described as the best condition for efficiently heating the container itself, but as another embodiment of the present invention, the partial sectional view shown in FIG. Such a container structure is also conceivable. FIG. 3 (a) is characterized by a laminated structure composed of a layer having a heating effect and a layer having a heat insulating effect from the inside of the container to the outside of the container, and FIG. 3 (b) is from the inside of the container to the container. It is characterized in that it has a laminated structure composed of a layer having a heating effect, a layer having a heat retaining effect, and a layer having a heat insulating effect toward the outside.

[0014]

As described above, according to the present invention, by obtaining a closed container structure which is small and has a low profile and enables temperature compensation, the external dimensions can be significantly reduced as compared with the conventional one.
Moreover, power consumption can be reduced in the form of an oscillator.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a closed container structure of the present invention seen from a side surface.

FIG. 2 is a perspective view showing the total capacity of the present invention.

FIG. 3 is a partial cross-sectional view showing a closed container structure according to another embodiment of the present invention as seen from a side surface.

[Explanation of symbols]

1 container 2 Layers with heating effect 3 Layers with adiabatic effect 4 Layers that retain heat

Claims (6)

[Claims] 1. An electronic component container for accommodating electronic components inside a closed container structure, comprising a layered structure comprising a layer having a heating effect and a layer having a heat insulating effect from the inside of the container to the outside of the container. An electronic component container characterized by being present. 2. An electronic component container for accommodating electronic components inside a closed container structure, wherein a layer having a heating effect, a layer having a heat retaining effect, and a heat insulating effect are provided from the inside of the container toward the outside of the container. An electronic component container having a laminated structure composed of layers. 3. An electronic component container for accommodating electronic components inside a closed container structure, wherein a layer having a heating effect, a layer having a heat insulating effect, and a heat retaining effect are provided from the inside of the container toward the outside of the container. An electronic parts container having a laminated structure including layers and layers having a heat insulating effect. 4. The laminated structure according to any one of claims 1 to 3, wherein the heating effect is realized by a ceramic heater,
An electronic parts container characterized in that a heat insulating effect is realized by a dense ceramic material and a heat insulating effect is realized by a porous ceramic material. 5. The electronic component container according to claim 1, wherein the electronic component container is made of a ceramic material. 6. The electronic component container according to claim 1 or 3, wherein the total volume of the container is 0.09 cc or less.