JPH07105690B2 - Piezoelectric resonance component, manufacturing method thereof, and piezoelectric resonator device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a piezoelectric resonance component, a method for manufacturing the same, and a piezoelectric resonator device. In particular, the present invention relates to a piezoelectric resonance component formed by combining an insulating case having a terminal and a piezoelectric resonator, a method for manufacturing the same, and a piezoelectric resonator device using the component.

[Industrial application] For example, a ladder type filter is being widely used mainly in communication devices as an intermediate frequency filter of 455 KHz.

With this conventional ladder filter, for example,
As shown in No. 024, it has a configuration in which a plurality of piezoelectric resonators and terminals are housed in an overlapping manner in a case. This ladder filter has 4 piezoelectric resonators.
The number of parts is 15 points, the number is 6 points is 21 points, and the number is 9 points is 30 points. The ladder type filter is characterized by a large number of parts.

Therefore, it is difficult to achieve automation when assembling the filter.

An object of the present invention is to reduce the number of parts of a piezoelectric resonance component and to easily realize automatic assembly, a piezoelectric resonance component,
It is to provide a manufacturing method thereof and a piezoelectric resonator device.

[Means for Solving the Problems] A first aspect of the present invention includes a plurality of frame-shaped insulating cases each having a terminal integrated by insert molding and forming a space in which the terminal is opened on both sides. , And a plurality of piezoelectric resonators that are pressed against and connected to the terminals. Each case has a protrusion projecting like a frame at one end and a recess into which the protrusion fits, at the other end. These protrusions and recesses are formed by undercut fitting. The plurality of cases are put in a superposed state by fitting a protrusion provided in one of the adjacent cases and a recess provided in the other case to each other. In this superposed state, the piezoelectric resonator is provided between the adjacent cases. A resonator chamber for housing is provided by the space. Each of the piezoelectric resonators is connected to a predetermined terminal while being housed in the resonator chamber.

In the second invention, the projection and the recess are fitted and fixed to each other via an adhesive.

According to a third aspect of the present invention, the circuit board further includes a substrate on which predetermined wiring is provided, and the ladder type filter is configured by connecting the terminal to a predetermined position of the wiring.

According to a fourth aspect of the present invention, there is provided a frame-shaped insulating case that has terminals integrated by insert molding and forms open spaces on both sides of the terminals, and has a frame-shaped protrusion at one end thereof. A plurality of cases, each of which has a projection to which the projection is fitted, and has a recess at the other end into which the projection is fitted, and the projection and the recess are undercut-molded; And a step of preparing a piezoelectric resonator. Further, in order to put the plurality of cases in a superposed state, the protrusion provided in one of the adjacent cases and the recess provided in the other case are fitted to each other, and each piezoelectric resonator is sandwiched between each adjacent case and each piezoelectric The method includes the step of connecting the resonator to the terminal by pressure contact.

In a fifth aspect based on the fourth aspect, an adhesive is interposed between the protrusion and the recess when the cases are fitted to each other.

In a sixth aspect of the present invention, in the step of preparing each of the case and the piezoelectric resonator, a plurality of cases are integrally connected by a plurality of terminals being integrally connected through a continuous portion. Make up a group. Further, the superposing step includes superposing a large number of cases at the same time by superposing a case group, and after finishing the superposition, removing the connecting portion from the terminal.

[Operation and Effect] In the first invention, the terminal is integrated with the case by insert molding. Therefore, the number of parts to be handled when assembling the piezoelectric resonance component is reduced. Further, the piezoelectric resonance component is assembled by stacking the cases so that the piezoelectric resonance is housed in the case. That is, when the cases are overlapped with each other, the projection and the recess that provide the undercut fitting are fitted to each other, and
Since the protrusions are frame-shaped, in this superposed state,
A sealed resonator chamber is formed between adjacent cases, and each piezoelectric resonator is accommodated in the resonator chamber while being connected to a predetermined terminal by pressure contact. Therefore, according to the present invention, the assembling can be simplified, the assembled state can be reliably maintained, and the assembling process can be easily automated. Further, by changing the number of cases to be overlapped and the number of piezoelectric resonators to be used, it is possible to easily obtain a piezoelectric resonance component having various characteristics.

According to the second aspect of the invention, since the protrusion and the recess are fitted and fixed to each other via the adhesive, the case is more firmly superposed, and a highly durable piezoelectric resonance component can be obtained. .

According to the third invention, it is possible to obtain the ladder type filter having the above-mentioned excellent characteristics. Further, since the wiring for forming the ladder type filter is formed on the substrate side, the structure of the piezoelectric resonance component can be simplified and the automatic assembly can be easily performed.

According to the fourth aspect of the invention, since the number of parts to be handled is small and only the cases need to be overlapped with each other, it is possible to realize a method of manufacturing a piezoelectric resonance component which is easy to assemble. Therefore, according to the fourth aspect, the automatic assembly of the piezoelectric resonance component can be easily performed. Moreover, according to the fourth aspect of the invention, the piezoelectric resonance component having various characteristics can be easily obtained by changing the number of cases to be overlapped and the number of piezoelectric resonators to be used.

According to the fifth invention, in addition to the excellent features of the fourth invention, a highly durable assembly using an adhesive can be performed.

According to the sixth aspect, a large number of piezoelectric resonant components can be assembled at one time, and the efficiency of the assembly process can be improved. Further, since the assembly process is performed in a state in which a large number of case groups are integrated via the connecting portion, the case can be easily handled during the assembly process. Therefore, according to the eighth aspect of the invention, the process of assembling the piezoelectric resonance component can be performed easily and efficiently.

[Example] In FIGS. 1, 2, and 3 showing a piezoelectric resonator device, a substrate 2 is arranged below a piezoelectric resonance component 1. The piezoelectric resonance component 1 has a plurality of frame-shaped cases 3 and 4 and a plurality of piezoelectric resonators 5 and 6.

The case 3 is made of resin and has a pair of terminals 7 and 8 integrated by insert molding. The case 3 forms open spaces on both sides of the terminals 7 and 8, respectively. Adjacent terminals 7 and 8 are case 3
It is insulated by the partition wall 9 formed integrally with. On the right side of FIG. 1 of the case 3, a frame-shaped protrusion 10 protruding rightward
Are formed. Further, on the left side of FIG.
A recess 11 is formed.

A resonator chamber 12 is configured as defined by the protrusion 10. A positioning projection 13 is integrally formed on the wall surface of the resonator chamber 12 so as to project toward the center. The piezoelectric resonator 5 is guided by the protrusion 13 and is arranged at a predetermined position in the resonator chamber 12.

The terminals 7 and 8 have a raised portion 14 at the center. One of the terminals 7 is exposed in the resonator chamber 12, and the raised portion 14 presses against one main surface of the piezoelectric resonator 5. The other terminal 8 is exposed on the recess 11 side.

The case 4 is made of resin and has a pair of terminals 17 and 18 integrated by insert molding. Case 4
Form open spaces on both sides of the terminals 17 and 18, respectively. Both terminals 17 and 18 are overlapped in a state of being in contact with each other and are in an electrically connected state. A frame-shaped protrusion 20 is formed on the right side of the case 4 in FIG. A recess 21 is formed on the left side of the case 4 in FIG.

A resonator chamber 22 is configured as defined by the protrusion 20. The piezoelectric resonator 6 is arranged in the resonator chamber 22. A protrusion 23 projecting toward the center is integrally formed on the wall surface of the resonator chamber 22, and the piezoelectric resonator 6 is positioned at a predetermined position by the protrusion 23.

The terminals 17 and 18 have a raised portion 24 at the center thereof.
One terminal 17 is exposed on the resonator chamber 22 side, and the raised portion 14 is in pressure contact with one main surface of the piezoelectric resonator 6. The other terminal 18 is exposed on the resonator chamber 12 side, and the raised portion 24 is in pressure contact with the other main surface of the piezoelectric resonator 5.

The protrusion 10 of the case 3 is fitted in the recess 21 of the case 4,
The protrusion 20 of the case 4 is fitted in the recess 11 of the case 3.
In the embodiment shown in FIGS. 1 to 3, four cases 3 and three cases 4 are alternately superposed, and three piezoelectric resonators 5 and 3 are provided in respective resonator chambers 12 and 22. Each of the piezoelectric resonators 6 is housed. As is apparent from FIG. 4 which is exaggeratedly shown, the protrusions 10 and 20 are formed in a shape that is slightly enlarged toward the tip. Further, the recesses 11 and 21 are formed in a shape that is slightly enlarged toward the bottom side thereof. That is, these protrusions 1
The 0, 20 and the recesses 11, 21 are formed by undercut fitting. By this undercut type fitting, the cases 3 and 4 are firmly connected to each other. Further, an adhesive agent (not shown) is interposed between the projections 10 and 20 and the recess portions 11 and 21, and the adhesive agent further strengthens the connection between the cases 3 and 4.

The terminals 7, 8, 17, 18 are members made of sheet metal, and integrally have leg portions 30 extending downward as shown in FIGS. 2 and 3. The leg portion 30 is inserted into a hole 31 formed at a predetermined position of the substrate 2. On the lower surface of the board 2, a predetermined printed wiring
32 is provided, and each leg portion 30 is soldered to the wiring 32, so that the leg portion 30 and the wiring 32 are electrically connected. The legs 17 are not provided on the terminals 17.

An outline of the electrical connection state of the piezoelectric resonance component 1 configured as shown in FIGS. 1 to 3 is shown in FIG. In FIG. 5, the leftmost terminal 17 is one of the input / output terminals. The terminal 18 arranged on the rightmost side of the terminals 18 serves as the other input / output terminal. In this embodiment, a pair of terminals 7 and 18 arranged on both sides of the terminal 8 are electrically connected to each other on the substrate 2 to form a ladder type filter. Further, each terminal 8 is connected to the ground 33 via the wiring 32 of the substrate 2.

The equivalent circuit of the piezoelectric resonator device configured as described above is
Shown in the figure. As is apparent from FIG. 6, this piezoelectric resonator device has a structure in which three stages of ladder type filters are connected.

Next, a method of manufacturing the piezoelectric resonator device will be described.

First, as shown in FIG. 7, a large number of terminals 7, 8, 17, 18 are prepared. In this case, the legs 7, 8 and 18 of the terminals 7, 8 and 18 are integrally connected via the continuous portion 40. That is, each of the terminals 7, 8, and 18 is prepared as a member in which a large number of them are integrally connected.

The terminal 7 and the terminal 8 shown in FIG. 7 are used, and the case 3 is formed on the outer peripheral side by the insert molding method. The state is shown in FIG. In FIG. 8, a large number of members in which each case 3 is integrally continuous via the continuous portion 40 are prepared. Further, the case 4 is integrally formed with the terminal 18 by the insert molding method. The state is shown in FIG. In FIG. 9, the terminal 17 having no leg portion and the terminal 18 having a leg portion are overlapped with each other, and the case 4 is integrally formed on the outer peripheral side thereof. Further, the cases 4 are integrally connected via the continuous portion 40. Many members as shown in FIG. 9 are also prepared.

Next, the member shown in FIG. 9 is superposed on the member shown in FIG. 8, and the member shown in FIG. 8 is superposed on the member shown in FIG. The member and the three members shown in FIG. 9 are stacked. In addition,
At the time of this stacking, the piezoelectric resonators 5 and 6 (FIG. 1) are housed in the cases 3 and 4, respectively. This results in a number of assemblies that are assembled as shown in FIG. 1 and that are connected together by the continuum 40. Finally, by cutting off the continuous portion 40 at the position shown by the phantom line A in FIGS. 8 and 9, a large number of piezoelectric resonance components 1 are obtained.

By mounting the obtained piezoelectric resonance component 1 on the substrate 2 as shown in FIGS. 2 and 3, a piezoelectric resonator device constituting a ladder type filter can be obtained.

In this way, the piezoelectric resonance component can be easily obtained by only stacking the members shown in FIG. 8 and FIG. Therefore, the manufacturing process can be easily automated.
Also, during the assembly process, the terminals 7,8,17,18 are already integrated with the cases 3 and 4 by insert molding,
The number of parts is reduced and the assembly process is simplified. Moreover, since the manufacturing is performed using the terminals 7, 8 and 18 having the continuous portion 40, it is possible to assemble a large number of piezoelectric resonance components at one time in the assembly process, and to improve the efficiency of the assembly process. .

When obtaining piezoelectric resonance components having various filter characteristics, simply change the characteristics of the piezoelectric resonators 5 and 6 to be used, or change the number of cases 3 and 4 and piezoelectric resonators 5 and 6 to be overlapped. Good. This makes it possible to easily obtain piezoelectric resonance components having different filter characteristics.

[Other Embodiments] (a) Although the ladder type filter has been described in the above embodiments, the application of the present invention is not limited thereto.

For example, a Yaumann type filter as shown in Japanese Utility Model Publication No. 50-66548, a trap circuit as shown in Japanese Utility Model Publication No. 52-89938, and a trap circuit as shown in Japanese Utility Model Publication No. 54-11140. The present invention can be similarly applied to such a multiple oscillator, a discriminator as shown in Japanese Utility Model Publication No. 57-34812, and the like.

(B) A separate insulator may be used for insulation between the terminals 7 and 8.

(C) The leg portion 30 may be formed short as shown in FIG. 10 and the tip end thereof may be bent. This enables the piezoelectric resonance component to be surface-mounted on the substrate. According to this structure, it is not necessary to form a hole for the piezoelectric resonance component on the substrate.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a sectional view taken along the line I-I of FIG. FIG. 2 is a front view of the embodiment. FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 4 is an exaggerated sectional view of the fitting portion of the case. Fifth
The figure is a schematic diagram showing an electrical connection state of the embodiment. FIG. 6 is an equivalent circuit diagram of the embodiment. FIG. 7 is a plan view of a terminal used in one embodiment of the manufacturing method. 8 and 9 are partial plan views each showing one step of the manufacturing method. FIG. 10 is a perspective partial view of another embodiment. 1 is a piezoelectric resonance component, 2 is a substrate, 3 and 4 are cases, 5 and 6 are piezoelectric resonators, 7,8,17,18 are terminals, 10 and 20 are protrusions, 11 and 21 are concave parts, 32 is wiring, 40 is a continuous part.

Claims (6)

[Claims] 1. A plurality of frame-shaped insulative cases, which have terminals integrated by insert molding and form open spaces on both sides of the terminals, are connected to the terminals by pressure contact. A plurality of piezoelectric resonators, each case has a frame-shaped projection at one end thereof, and a recess for fitting the projection at the other end thereof, the projection and the The recess is formed by undercut fitting, and the plurality of cases are put in a superposed state by fitting a protrusion provided on one of the adjacent cases and a recess provided on the other to each other, In the superposed state, a resonator chamber accommodating the piezoelectric resonator is provided by the space between the adjacent cases, and each of the piezoelectric resonators has the resonator chamber. In a state of being accommodated in a piezoelectric resonance component which is connected to a predetermined said terminal. 2. The piezoelectric resonance component according to claim 1, wherein the protrusion and the recess are fitted and fixed to each other via an adhesive. 3. The piezoelectric resonator device according to claim 1, further comprising a substrate on which predetermined wiring is provided, and the ladder type filter is configured by connecting the terminal to a predetermined position of the wiring. 4. A frame-shaped insulating case having a terminal integrated by insert molding and forming open spaces on both sides of the terminal, the frame-shaped insulating case protruding at one end thereof. A plurality of such cases, each of which has a projection to which the projection is fitted and has a recess at the other end into which the projection is fitted, and the projection and the recess are undercut-molded; A step of preparing a piezoelectric resonator and, in order to put a plurality of cases in a superposed state, a protrusion provided in one of the adjacent cases and a recess provided in the other case are fitted to each other, and a space between the adjacent cases is provided. Sandwiching each of the piezoelectric resonators and connecting each of the piezoelectric resonators to the terminals by pressure contact with. 5. The method of manufacturing a piezoelectric resonant component according to claim 4, wherein an adhesive is interposed between the protrusion and the recess when the cases are fitted to each other. 6. In the step of preparing each of the case and the piezoelectric resonator, a plurality of cases are connected by the terminals being integrally connected through a continuous portion to form a plurality of case groups. The stacking step includes stacking a plurality of cases at the same time by stacking the case groups, and removing the connecting portion from the terminal after the stacking is completed. Alternatively, the method for manufacturing a piezoelectric resonance component according to the above item 5.