阅读说明：本技术 一种石英晶体谐振器 (Quartz crystal resonator ) 是由 童文鹏 罗俊强 戴文杰 徐仙 于 2021-08-12 设计创作，主要内容包括：本申请涉及一种石英晶体谐振器,其包括底座；外盖,安装于底座上并与底座配合形成容纳腔；风挡,底部安装于底座上且位于容纳腔中,底部向内凹陷以与底座配合形成工作腔,顶部向内凹陷形成隔热槽；所述隔热槽的底部设置有条形的电热补温丝,所述隔热槽的顶部设置有朝向电热补温丝下凹并接触的导电膜,所述导电膜与所述隔热槽配合形成密闭空间；石英晶振电路,位于工作腔内且安装于底座上,并朝向风挡延伸有电路以为电热补温丝供电。本申请具有减少工作环境温度改变对石英晶体振荡器的影响的效果。(The present application relates to a quartz crystal resonator comprising a base; the outer cover is arranged on the base and matched with the base to form an accommodating cavity; the bottom of the windshield is arranged on the base and is positioned in the accommodating cavity, the bottom of the windshield is inwards sunken to be matched with the base to form a working cavity, and the top of the windshield is inwards sunken to form a heat insulation groove; the bottom of the heat insulation groove is provided with a strip-shaped electric heating temperature compensation wire, the top of the heat insulation groove is provided with a conductive film which is concave towards the electric heating temperature compensation wire and is contacted with the electric heating temperature compensation wire, and the conductive film and the heat insulation groove are matched to form a closed space; and the quartz crystal oscillator circuit is positioned in the working cavity, is arranged on the base and extends towards the windshield to form a circuit for supplying power to the electric heating temperature compensating wire. The quartz crystal oscillator has the effect of reducing the influence of the temperature change of the working environment on the quartz crystal oscillator.)

1. A quartz crystal resonator, comprising:

a base (1);

the outer cover (2) is arranged on the base (1) and is matched with the base (1) to form an accommodating cavity (21);

the bottom of the windshield (3) is arranged on the base (1) and is positioned in the accommodating cavity (21), the bottom of the windshield is inwards sunken to be matched with the base (1) to form a working cavity (31), and the top of the windshield is inwards sunken to form a heat insulation groove (32); a strip-shaped electric heating temperature compensation wire (33) is arranged at the bottom of the heat insulation groove (32), a conductive film (34) which is concave towards the electric heating temperature compensation wire (33) and is contacted with the electric heating temperature compensation wire is arranged at the top of the heat insulation groove (32), and the conductive film (34) and the heat insulation groove (32) are matched to form a closed space;

and the quartz crystal oscillator circuit (4) is positioned in the working cavity (31), is arranged on the base (1), and extends towards the windshield (3) to form a circuit to supply power for the electric heating temperature compensating wire (33).

2. The quartz crystal resonator according to claim 1, wherein the electrothermal temperature compensating wire (33) is inserted in the middle of the bottom of the heat insulation groove (32), and one side of the electrothermal temperature compensating wire (33) facing the conductive film (34) is provided with an electrical connection surface for abutting against the conductive film (34).

3. The quartz crystal resonator according to claim 2, wherein the conductive film (34) includes an elastic heat insulating film (341) and a conductive coating (342), the elastic heat insulating film (341) being attached to a notch edge of the heat insulating groove (32) to close the notch, the conductive coating (342) being provided on a side of the elastic heat insulating film (341) facing an inside of the heat insulating groove (32).

4. The quartz crystal resonator according to claim 3, wherein the elastic thermal insulating film (341) is an epoxy film and the conductive coating (342) is a metal powder coating.

5. The quartz crystal resonator according to claim 1, wherein the base (1) is provided with two electrical contacts (11) and is respectively connected with a positive power supply end and a negative power supply end of the quartz crystal oscillator circuit (4), and the bottom of the windshield (3) opposite to the electrical contacts (11) is provided with a conducting wire which extends upwards along the bottom of the windshield (3) and penetrates through the windshield (3) until being electrically connected with the end part of the electric heating temperature compensation wire (33).

6. The quartz crystal resonator according to claim 1, characterized in that the outer cover (2) has a gap with the windshield (3) to form an insulating air layer (12).

7. The quartz crystal resonator according to claim 1, characterized in that the base (1) is provided with a fixing ring groove (13) which is matched with the shape of the bottom of the windshield (3), and the bottom of the windshield (3) is embedded in the fixing ring groove (13).

8. The quartz crystal resonator according to claim 1, characterized in that the cover (2) is a component made of metal, and the windshield (3) and the base (1) are components made of epoxy resin material.

Technical Field

The application relates to the field of crystal oscillators, in particular to a quartz crystal resonator.

Background

A quartz crystal resonator (often abbreviated as Xtal), which is an electronic device utilizing the piezoelectric effect of quartz crystal (also called crystal) to generate high-precision oscillation frequency, and belongs to a passive device.

In the related art, the quartz crystal resonator covers the outside with a metal lid having good thermal conductivity to dissipate heat and to produce an electromagnetic shielding effect. However, when a quartz crystal resonator is mounted in a sealed device with poor heat dissipation, the quartz crystal resonator is easily affected by temperature changes due to the operation of the mounted device and the environment, and frequency fluctuations due to minute current changes accompanying temperature control may occur. For example, for a tablet computer, the rated operating temperature of the quartz crystal oscillator is 40 ℃, and the use temperature of the tablet computer may be below zero in a cold environment in winter. Or the heat generated by the devices in the tablet computer during the over-clocking or the down-clocking is not the same, which is easy to cause the large temperature change of the internal closed environment of the tablet computer.

Disclosure of Invention

In order to reduce the influence of the temperature change of the working environment on the quartz crystal oscillator, the quartz crystal resonator is provided.

The application provides a quartz crystal resonator, adopts following technical scheme:

a quartz crystal resonator comprising:

a base;

the outer cover is arranged on the base and matched with the base to form an accommodating cavity;

the bottom of the windshield is arranged on the base and is positioned in the accommodating cavity, the bottom of the windshield is inwards sunken to be matched with the base to form a working cavity, and the top of the windshield is inwards sunken to form a heat insulation groove; the bottom of the heat insulation groove is provided with a strip-shaped electric heating temperature compensation wire, the top of the heat insulation groove is provided with a conductive film which is concave towards the electric heating temperature compensation wire and is contacted with the electric heating temperature compensation wire, and the conductive film and the heat insulation groove are matched to form a closed space;

and the quartz crystal oscillator circuit is positioned in the working cavity, is arranged on the base and extends towards the windshield to form a circuit for supplying power to the electric heating temperature compensating wire.

Through adopting above-mentioned technical scheme, the bottom of base is provided with pin or contact to be used for carrying out the paster with external circuit and being connected or welding, the top of base is provided with quartz crystal oscillator circuit, and quartz crystal oscillator circuit's input links to each other with the pin or the contact electrical property of base bottom. The outer cover and the base are matched to serve as an outermost heat insulation layer to separate the accommodating cavity in the quartz crystal resonator from the outside, and the influence of external cold air or hot air on internal elements of the accommodating cavity is reduced. Since the outer cover is required for Electromagnetic Compatibility (EMC), the outer cover is generally provided as a metal outer cover to function as an Electromagnetic shield, so that the outer cover has high thermal conductivity. The wind shield further blocks heat inside the accommodating cavity, and further slows down the flow of external heat to the inside or the loss of internal heat to the outside.

When the quartz crystal oscillator circuit works, the electric heating temperature compensation wire is electrified to work to generate a certain temperature compensation to maintain the quartz crystal oscillator circuit within a rated working temperature range, so that the high-precision oscillation frequency generated by the quartz crystal oscillator circuit is ensured. Because when ambient temperature changes, will influence inside temperature, consequently carry out the adjustment of adaptation to mending the temperature in this scheme.

The insulating film on top of the windshield separates the air above the windshield into two parts, air is a poor heat transfer medium, the common ways of air transferring heat are heat transfer, heat radiation and convection, the air inside the outer cover is apparently stagnant, and therefore relies primarily on heat transfer and heat radiation to transfer energy. Since the heat transfer and the heat radiation are slow and uneven, if a thermistor is provided in the quartz crystal oscillator circuit for temperature detection, the detected temperature is likely to be low or high. In this scheme, the conducting film separates the air, blocks heat transfer and thermal radiation for the temperature difference appears in conducting film both sides air temperature. According to an ideal gas state equation, the air on the two sides of the conductive film is respectively considered as a whole, and when the air on the two sides has a large temperature difference, the pressure and the volume of the air on the two sides are changed. When the external temperature rises, the conductive film is pressed to the electric heating temperature compensating wire by the external air pressure, the contact part of the electric heating temperature compensating wire and the conductive film is increased, and the short circuit part is increased, so that the heat production part of the electric heating temperature compensating wire is reduced, and the generated heat compensation is reduced. When the external temperature is reduced, the conductive film is pressed to the electric heating temperature compensating wire by the internal air pressure, the contact part of the electric heating temperature compensating wire and the conductive film is reduced, and the short circuit part is reduced, so that the heat production part of the electric heating temperature compensating wire is increased, and the generated heat compensation is increased. In summary, the operating temperature inside the quartz crystal oscillator is stably maintained within the rated operating range by changing the heat compensation, so that the quartz crystal oscillator circuit can generate high-precision oscillation frequency.

Optionally, the electric heating temperature compensation wire penetrates through the middle of the bottom of the heat insulation groove, and an electric connection surface used for being abutted against the conductive film is arranged on one side, facing the conductive film, of the electric heating temperature compensation wire.

Through adopting above-mentioned technical scheme, the electric heat is mended the temperature silk and is located the middle part of heat-proof tank, and the middle part displacement degree is high when the conductive film is out of shape, can take place the butt with the electric heat is mended the temperature silk easily. The conductive film is electrically connected when abutting against the electrical connection surface, and the electric heating temperature compensation wire at the contact part is short-circuited by the conductive film because the resistance of the electric heating temperature compensation wire is larger and the resistance of the conductive film is smaller.

Optionally, the conductive film includes an elastic heat insulation film and a conductive coating, the elastic heat insulation film is connected to the edge of the notch of the heat insulation groove to close the notch, and the conductive coating is disposed on one side of the elastic heat insulation film facing the inside of the heat insulation groove.

Optionally, the elastic heat insulation film is an epoxy resin film, and the conductive coating is a metal powder coating.

By adopting the technical scheme, the epoxy resin film has better heat insulation capability and better elasticity, and the metal powder coating has smaller influence on the elasticity of the epoxy resin film.

Optionally, the base is provided with two electrical contacts and is respectively connected with the positive power supply end and the negative power supply end of the quartz crystal oscillator circuit, the bottom of the windshield is provided with a lead at a position opposite to the electrical contacts, and the lead is sunken and extends upwards along the bottom of the windshield and penetrates through the windshield until being electrically connected with the end part of the electric heating temperature compensation wire.

By adopting the technical scheme, when the windshield is correctly aligned with the base, the quartz crystal oscillator circuit and the electric heating temperature compensation wire form a loop to provide power output for the electric heating temperature compensation wire.

Optionally, the outer cover has a gap with the windshield to form an insulating air layer.

Through adopting above-mentioned technical scheme, compare in the scheme that enclosing cover and windscreen direct butt, enclosing cover and windscreen clearance set up can produce thermal-insulated air bed, compare in enclosing cover-the scheme of windscreen lug connection, enclosing cover-thermal-insulated air bed-the scheme of windscreen, thermal-insulated effect is better. At the same time, the heat in the insulating air layer flows, and can expand and boost as a whole, thereby generating average data.

Optionally, a fixing ring groove matched with the bottom of the windshield in shape is arranged on the base, and the bottom of the windshield is embedded in the fixing ring groove.

Through adopting above-mentioned technical scheme, the setting of fixed ring groove for the windscreen can be fixed with the base when the assembly, makes the electric contact on the base and the wire counterpoint contact on the windscreen.

Optionally, the outer cover is an assembly made of metal, and the windshield and the base are assemblies made of epoxy resin materials.

By adopting the technical scheme, the outer cover is arranged as the metal outer cover, so that better Electromagnetic Compatibility (EMC) can be generated, and the Electromagnetic shielding effect is achieved. The windshield and the base are made of epoxy resin, so that the heat insulation capability is better.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the heat exchange between the outside and the inside can be reduced in a multi-level manner, and the environmental influence is reduced, so that the working stability of the quartz crystal oscillator circuit is improved.

2. The power of the heat compensation is changed by changing the air pressure at two sides of the conductive film, so that the interior of the outer cover is stably maintained in a rated working range.

Drawings

Fig. 1 is an overall schematic diagram of a quartz crystal resonator in an embodiment of the present application.

Fig. 2 is a sectional view of a quartz crystal resonator in an embodiment of the present application.

Description of reference numerals:

1. a base; 11. an electrical contact; 12. a heat insulating air layer; 13. a fixed ring groove; 2. an outer cover; 21. an accommodating chamber; 3. a windshield; 31. a working chamber; 32. a heat insulation groove; 33. an electric heating temperature compensation wire; 34. a conductive film; 341. an elastic heat insulating film; 342. a conductive coating; 4. a quartz crystal oscillator circuit.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a quartz crystal resonator. Referring to fig. 1 and 2, the quartz crystal resonator comprises a base 1, an outer cover 2, a windshield 3 and a quartz crystal oscillator circuit 4, wherein the base 1 is used for carrying the quartz crystal oscillator circuit 4 to be electrically connected with an external circuit, and the windshield 3 and the outer cover 2 are arranged on the quartz crystal oscillator circuit 4 from inside to outside and sequentially prevent heat exchange from occurring inside and outside.

The base 1 is usually made of epoxy resin material, such as a substrate containing glass epoxy, etc., and the base 1 may also be made of other materials, such as a composite material formed by conductive material and insulating material, but any material with insulating and better heat insulation effects may be used. The bottom of the base 1 may be provided with pins for soldering with an external circuit board or with contacts for a patch connection with an external circuit board. For the mode of patch connection, have the advantage of convenient processing, for example can make both connect through wave-soldering. With the pin connection mode, the bottom plate and the external circuit board can generate a gap without direct connection, so that the heat on the circuit board is reduced from being transferred to the bottom plate.

The base 1 is provided with the cover 2 so as to cover the base 1, and the cover 2 is fixed to the base 1 by adhesion. The base 1 may be a square or circular flat plate, the projection of the cover 2 on the base 1 may be a corresponding square or circular plate, the projection may fall on the edge of the base 1 or inside the base 1, but it is sufficient that the base 1 and the cover 2 cooperate to form a closed accommodating cavity 21. In the present embodiment, the outer cover 2 is a square cover and made of a metal material, which can generate better Electromagnetic Compatibility (EMC) and play a role of Electromagnetic shielding. The bottom opening of the outer cover 2 can be in regular shapes such as square, round and the like, and can also be in irregular shapes, but the quartz crystal oscillator circuit 4 can be accommodated in the opening and does not interfere with the windshield 3 and the quartz crystal oscillator circuit 4. In this embodiment, the bottom of the outer cover 2 is a regular square opening, and the outer cover 2 and the base 1 cooperate to form a containing cavity 21 with a square shape.

The windshield 3 is formed of a thermoplastic resin such as a liquid crystal polymer or plastic, and has an advantage of lower thermal conductivity as compared with a metal material, and can better insulate heat penetrating from the outer cover 2 and prevent heat inside the windshield 3 from being lost outward. In the present embodiment, the windshield 3 is a component made of an epoxy resin material. Specifically, the windshield 3 is located and holds the chamber 21 and the bottom is installed on base 1, and the bottom of windshield 3 is inwards sunken to form working chamber 31 with base 1 cooperation, and the top is inwards sunken to form heat-insulating groove 32, that is to say, windshield 3 is equivalent to the bottom of two tube-shape devices and splices each other and forms, and the middle part forms the heat-insulating groove 32 that the baffle has separated the sunken of bottom and top. In the present embodiment, the windshield 3 is a square block, the heat insulation groove 32 formed at the top of the windshield 3 is a shallow square groove, and the bottom of the windshield 3 is recessed to form a deep square groove. In order to fix the windshield 3 and the base 1, a fixing ring groove 13 matched with the bottom of the windshield 3 in shape is arranged on the base 1, and the bottom of the windshield 3 is embedded in the fixing ring groove 13. Further, the bottom of the windshield 3 and the fixing ring groove 13 can be fixed in an adhesion manner.

In order to better improve the heat insulation capability of windshield 3 and outer cover 2, outer cover 2 has a gap with windshield 3 to form heat insulation air layer 12, and in some embodiments, the projection of the side wall of outer cover 2 on base 1 is spaced from the projection of windshield 3 on base 1; further, in some embodiments, the side walls of the cover 2 are arranged in parallel with and spaced from the side walls of the windshield 3. Compared with the scheme that the outer cover 2 is directly abutted to the windshield 3, the clearance arrangement of the outer cover 2 and the windshield 3 can generate the heat insulation air layer 12, and compared with the scheme that the outer cover 2 is directly connected with the windshield 3, the scheme that the outer cover 2 is connected with the windshield 3 through the heat insulation air layer 12 is better in heat insulation effect. At the same time, the heat in the insulating air layer 12 flows, and expansion and pressure rise can occur as a whole, thereby generating average data.

In order to reduce the influence of low temperature on the quartz crystal oscillator circuit 4, the electric heating temperature compensation wire 33 is arranged inside the outer cover 2, and when the quartz crystal oscillator circuit 4 works, the electric heating temperature compensation wire 33 is electrified to work so as to generate a certain temperature compensation to maintain the quartz crystal oscillator circuit 4 within a rated working temperature range, so as to ensure that the quartz crystal oscillator circuit 4 generates high-precision oscillation frequency. Because when ambient temperature changes, will influence inside temperature, consequently carry out the adjustment of adaptation to mending the temperature in this scheme.

Specifically, the electric heating temperature compensation wire 33 is arranged in a strip shape and penetrates through the middle of the bottom of the heat insulation groove 32, the top of the heat insulation groove 32 is provided with a conductive film 34 which is concave towards the electric heating temperature compensation wire 33 and contacts with the electric heating temperature compensation wire, the conductive film 34 and the heat insulation groove 32 are matched to form a closed space, and one side of the conductive film 34 facing the electric heating temperature compensation wire 33 is provided with an electric connection surface used for being abutted against the conductive film 34. Since the electrothermal compensating wires 33 are located in the middle of the heat insulation tank 32, the conductive film 34 has a high displacement degree in the middle when deformed, and can easily abut against the electrothermal compensating wires 33. The conductive film 34 is electrically connected when it is in contact with the electrical connection surface, and since the resistance of the electrothermal filament 33 is large and the resistance of the conductive film 34 is small, the conductive film 34 short-circuits the electrothermal filament 33 at the contact portion. Specifically, the conductive film 34 includes an elastic heat insulating film 341 and a conductive coating 342, the elastic heat insulating film 341 is connected to the edge of the notch of the heat insulating groove 32 to close the notch, and the conductive coating 342 is provided on the side of the elastic heat insulating film 341 facing the inside of the heat insulating groove 32. The elastic heat insulating film 341 may be an elastic film such as a rubber film or an epoxy film, but may be a material having good elasticity and good heat insulating ability. The conductive coating 342 is a metal powder coating or other powder coating, but it is sufficient if the bottom surface of the elastic heat insulating film 341 has conductivity.

Two electric contacts 11 are arranged on the base 1 and are respectively connected with the positive power supply end and the negative power supply end of the quartz crystal oscillator circuit 4, wires (not shown in the figure) are arranged at the positions of the bottom of the windshield 3 opposite to the electric contacts 11, and the wires extend upwards along the bottom of the windshield 3 and penetrate through the windshield 3 until being electrically connected with the end part of the electric heating temperature compensating wire 33. When the windshield 3 is aligned with the base 1 correctly, the quartz crystal oscillator circuit 4 and the electric heating temperature compensation wire 33 form a loop to provide power output for the electric heating temperature compensation wire 33.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.