JPH07297667A - Surface mounted type piezoelectric vibrator - Google Patents

Abstract

PURPOSE:To provide a thin surface mounted type piezoelectric vibrator with improved impact resistance capable of highly stabilizing the long term secular change of a frequency by providing a terminal member provided with a terminal seal surface and a case provided with a seal surface to be joined with the terminal seal surface. CONSTITUTION:The terminal member 11 is composed of the insulation material of ceramics, the shape is approximately a quadrangle and the terminal seal surface 13 is provided on one end of the terminal member 11. An electrode pad 15 is conducted with a part of a lead wire 21 through a through-hole 22 and the supporting member 16 of a piezoelectric body 19 is provided on the end part of the lead wire 21. The shape of the case 12 is a hollow quadrangle, it is composed of metal or glass and the case 12 is provided with a case seal surface on an opening end part. The terminal seal surface 13 of the terminal member 11 and the case seal surface of the case 12 are soldered by using low- melting glass, seam-welded or anode-connected. Since the seal surface 13 is small, uniform joining is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a highly stable surface mount type piezoelectric vibrator, and more particularly to a surface mount type piezoelectric vibrator which is thin and has a small frequency change over time and excellent in impact resistance. Is.

[0002]

2. Description of the Related Art A conventional surface mount type piezoelectric vibrator is shown in FIG.
This will be described with reference to FIG. FIG. 3 is a perspective view showing a conventional surface mount type piezoelectric vibrator. FIG. 4 is a sectional view showing a conventional surface mount type piezoelectric vibrator.

As shown in FIGS. 3 and 4, the conventional surface mount type piezoelectric vibrator includes a terminal member 11 and a lid 23. The terminal member 11 is made of a box-shaped ceramic insulating material, and has a terminal sealing surface 13 on the end surface of the opening.

A circular or polygonal recess 14 is provided on the side surface of the terminal member 11, and an electrode pad 15 connected to the recess 14 is provided on the bottom surface.

The electrode pad 15 is electrically connected to the support member 24 in the terminal member 11 through the lead wire 21 that hermetically penetrates the terminal member 11 in the direction perpendicular to the mounting surface.

The support member 24 has a stage 25 for fixing the piezoelectric body 19, and the piezoelectric body 19 is fixed on the stage 25 with a conductive adhesive 26.

On the terminal sealing surface 13 of the terminal member 11,
A lid 23 made of a metal material having a substantially plate shape is placed, and the terminal member 11 and the lid 23 are brazed using a low-melting glass or alloy, seam-welded, or anodically joined to form a surface-mounted piezoelectric vibrator. Make the inside a predetermined atmosphere.

Further, the conventional surface mount type piezoelectric vibrator is arranged so as to have the terminal sealing surface 13 in the horizontal direction with respect to the mounting surface of the printed board 20, and the electrode pad 15 provided on the bottom surface of the terminal member 11 is printed. It is mounted on the board 20 using the solder 18.

[0009]

As shown in FIG. 3, the conventional surface mount type piezoelectric vibrator has a terminal member 11 made of a ceramic insulating material as a base, and a lid 23 made of metal placed on top of the base member. By joining the terminal member 11 and the lid 23, the inside of the surface-mounted piezoelectric vibrator is made to have a predetermined atmosphere.

However, in the case of the conventional surface mount type piezoelectric vibrator, the terminal member 1 made of ceramic and an insulating material is used.
Since 1 is the base, the terminal sealing surface 13 of the terminal member 11 is large. The larger the terminal sealing surface 13, the more warp peculiar to the material exists on the terminal sealing surface 13.

The warp peculiar to the material of the terminal sealing surface 13 causes the uneven bonding, and it is difficult to create a predetermined atmosphere in the surface mount type piezoelectric vibrator.

Moreover, the terminal member 11 made of an insulating material such as ceramics is used as a base. As a result, the surface area inside the terminal member 11 is increased, and the amount of gas and moisture generated from the inside of the container is increased.

Therefore, the generated gas and moisture are not contained in the piezoelectric body 1.
It is difficult to highly stabilize the long-term change of the frequency due to the adsorption to No. 9.

Further, in the support member structure in the conventional surface mount type piezoelectric vibrator, the lead wire 21 that hermetically penetrates the terminal member 11 extends in the direction perpendicular to the mounting surface, and the lead wire 2 is formed.
Since the support member 24 is provided at one end, the lead wire 21
The height of the surface mount type piezoelectric vibrator increases, and it is difficult to reduce the thickness.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a thin surface mount type piezoelectric vibrator excellent in impact resistance capable of being evenly bonded and highly stable in long-term frequency change. Is the purpose of.

[0016]

In order to achieve the above object, the surface mount type piezoelectric vibrator of the present invention adopts the constitution described below.

The surface mount type piezoelectric vibrator of the present invention comprises a terminal member and a case. The terminal member is made of an insulating material having a substantially quadrangular shape, and a terminal sealing surface for sealing is provided at one end, and the other. A circular or polygonal recess is formed at the end, and an electrode pad connected to the recess is installed on the bottom surface. The electrode pad is electrically connected to a support member in the terminal member, and the support member has a rectangular shape. A pair of holding portions having first slits for inserting and holding the corner portions of the piezoelectric body and a fixing portion having second slits for inserting the side portions of the rectangular piezoelectric body. The support member structure, the piezoelectric body is fixed to the support member, the case made of metal or glass has a case sealing surface at the opening end, and has a hollow substantially rectangular shape. Join with sealing surface It allows characterized by the inside surface mount type piezoelectric vibrator in a predetermined atmosphere.

[0018]

In the surface mount type piezoelectric vibrator of the present invention, the surface area of the terminal member made of an insulating material such as ceramics in which the amount of gas or moisture generated in the container is relatively large is made small.

By increasing the surface area of the case made of metal or glass in which gas and moisture are less likely to be generated, it is possible to suppress the generation of gas and moisture and to highly stabilize the long-term change in frequency.

The surface mount type piezoelectric vibrator of the present invention is
Since the sealing surface is small, uniform joining is easy. As a result, stable bonding is possible, and the surface-mounted piezoelectric vibrator can be stably placed in a predetermined atmosphere.

In the conventional surface mount type piezoelectric vibrator, the lead wire for supporting the supporting member extends in the direction perpendicular to the mounting surface. Therefore, the thickness of the lead wire increases by the height of the lead wire.

On the other hand, in the surface mount type piezoelectric vibrator of the present invention, the lead wire for supporting the support member is horizontal to the mounting surface, and the corner portion of the rectangular piezoelectric body is inserted and held. 2 is a pair of supporting member structures including a holding portion having a first slit and a fixing portion having a second slit for inserting a side portion of a rectangular piezoelectric body. Therefore, it is possible to reduce the thickness of the surface-mounted piezoelectric vibrator without affecting the thickness thereof.

Furthermore, in the surface mount type piezoelectric vibrator of the present invention, when it is mounted on a printed circuit board, it is mounted using solder on an electrode pad provided on the bottom surface of a terminal member made of an insulating material.

When a fixing strength is required for the printed circuit board, the bottom surface of the case made of metal and the printed circuit board can be soldered in addition to the electrode pad, and a strong fixing can be obtained.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a surface-mounted piezoelectric vibrator according to an embodiment of the present invention.

As shown in FIG. 1, the surface mount type piezoelectric vibrator of the present invention comprises a terminal member 11 and a case 12.

The terminal member 11 is made of a ceramic insulating material and has a substantially rectangular shape.

Further, a terminal sealing surface 13 for sealing is provided at one end of the terminal member 11, and a semicircular recess 14 is provided at the other end.
have.

An Ni-Au electrode pad 15 connected to the recess 14 is provided on the bottom surface of the terminal member 11.

The electrode pad 15 is used as the terminal member 1.
Lead wire 2 that penetrates 1 horizontally and airtightly to the mounting surface
Electrical continuity is established through a part of the through hole 22 and a part of the lead wire 1, and a support member 16 in the terminal member 11 is provided at the end of the lead wire 21.

This support member 16 is a rectangular piezoelectric body 19
Holding portion 17a having a first slit for inserting and holding the corner portion of the rectangular shape, and fixing portion 17b having a second slit for inserting the long side portion of the rectangular piezoelectric body 19.
It is a pair of support member structure comprised from.

A piezoelectric body 19 made of an AT plate crystal oscillator is inserted into the first and second slits of the support member 16, and the fixing portion 17a of the support member 16 and the piezoelectric body 19 are made of a conductive adhesive 26. The piezoelectric body 19 is fixed in the lateral direction.

The case 12 joined to the terminal member 11
The shape of is a hollow square and is made of metal or glass. Further, the case 12 has a case sealing surface at the opening end.

The terminal sealing surface 13 of the terminal member 11,
A predetermined atmosphere is created inside the surface-mounted piezoelectric vibrator by brazing, seam welding, or anodic bonding the case 12 and the case sealing surface with a low melting point glass or an alloy.

In the surface mount type piezoelectric vibrator having the structure shown in FIG. 1, the terminal member 11 made of a ceramic insulating material, which generates a relatively large amount of gas, moisture, etc., is made smaller than before.

As a result, it is possible to reduce gas and moisture generated from the container of the surface mount type piezoelectric vibrator. Therefore, it becomes possible to provide a surface-mounted piezoelectric vibrator having highly stable frequency characteristics for a long period of time.

Furthermore, since the sealing surface 13 is small, uniform joining is facilitated. Further, since the support member 16 is provided in the horizontal direction with respect to the mounting surface, it is possible to realize a thin surface-mounted piezoelectric vibrator excellent in impact resistance.

Further, the surface mount type piezoelectric vibrator of the present invention is arranged so as to have the terminal sealing surface 13 in the direction perpendicular to the mounting surface of the printed board 20, and the electrode pad 15 provided on the bottom surface of the terminal member 11. Solder 18 to printed circuit board 20
Implement using.

FIG. 2 is a perspective view showing the structure of a surface mount piezoelectric vibrator according to another embodiment of the present invention.

The main difference between the structure shown in FIG. 2 and the surface mount type piezoelectric vibrator shown in FIG. 1 is that a corner portion of a piezoelectric body 19 made of a rectangular AT crystal resonator has a first slit. Inserted into the holding portion 17a, the short side portion of the piezoelectric body 19 made of a rectangular AT crystal oscillator is fixed to the fixing portion 17 of the second slit.
It is a surface mount type piezoelectric vibrator using a support structure which is inserted in b and fixed in the longitudinal direction.

The structure other than the support structure of the piezoelectric body 19 is as follows.
Since it has the same configuration as the surface-mounted piezoelectric vibrator described with reference to FIG. 1, detailed description thereof will be omitted.

FIG. 5 is a sectional view showing the surface-mounted piezoelectric vibrator according to the embodiment of the present invention shown in FIGS.

As shown in FIG. 5, a conductive structure between the support member 16 inside the terminal member 11 and the electrode pad 15 outside the terminal member 11 is shown.

The shape of the terminal member 11 made of an insulating material is
The terminal member 11 has a substantially quadrangular box shape, and a lead wire 21 penetrates the terminal member 11 in a horizontal direction in an airtight manner with respect to the mounting surface.

A part of the lead wire 21 is connected to the terminal member 11
The electrode pad 15 made of Ni-Au provided on the bottom surface of the terminal member 11 is electrically connected through the through hole 22 therein.

In addition, at the end of the lead wire 21, a rectangular A
A holding portion 17a having a first slit for inserting and holding the corner portion of the piezoelectric body 19 made of a T crystal oscillator.
And a fixing portion 17b having a second slit for inserting the side portion of the piezoelectric body 19 made of a rectangular AT crystal oscillator.
It has a pair of support members 16 constituted by.

FIG. 6 is a sectional view showing the structure of a surface-mounted piezoelectric vibrator according to another embodiment of the present invention.

FIG. 6 shows the support member 16 inside the terminal member 11.
And a conductive structure with the electrode pad 15 outside the terminal member 11. In particular, the surface mount type piezoelectric vibrator is characterized in that it has the electrode pads 15 on the bottom surface and the top surface of the terminal member 11 and can be mounted on both surfaces.

The shape of the terminal member 11 made of an insulating material is
It has a substantially rectangular box shape, and the lead wire 21 penetrates the terminal member 11 in a horizontal direction in an airtight manner with respect to the mounting surface.

A part of the lead wire 21 is connected to the terminal member 11.
Terminal member 1 via through hole 22 penetrating therethrough
Electrical continuity is established between the electrode pad 15 made of Ni—Au provided on the bottom surface and the top surface of No. 1, respectively.

In addition, at the end of the lead wire 21, a rectangular A
A holding portion 17a having a first slit for inserting and holding the corner portion of the piezoelectric body 19 made of a T crystal oscillator.
And a pair of support members 16 including a fixing portion 17b having a second slit for inserting a side portion of the piezoelectric body 19 made of a rectangular crystal oscillator.

By providing the electrode pads 15 on both the bottom surface and the top surface of the terminal member 11, the surface-mounted piezoelectric vibrator of the present invention can be mounted on the printed circuit board 20 on both surfaces.

FIG. 7 is a side view showing a state in which a surface mount type piezoelectric vibrator according to another embodiment of the present invention is viewed from the side.

As shown in FIG. 7, the surface mount type piezoelectric vibrator of the present invention is arranged horizontally with respect to the printed circuit board 20,
Electrode pad 15 provided on terminal member 11 and printed circuit board 2
0 and 0 are mounted using the solder 18, and the printed circuit board 20
Fix the surface mount type piezoelectric vibrator to.

Further, when a fixed strength is required for the printed circuit board 20, the bottom surface of the case 12 made of metal and the printed circuit board 20 are soldered using the solder 18 in addition to the region of the electrode pad 15. As a result, the number of soldering points is increased, and the surface-mounted piezoelectric vibrator can be strongly fixed.

The sealing process of the surface mount type piezoelectric vibrator is as follows.
A sample is arranged and sealed on a heating stage or a heater jig in a chamber with a limited volume in a predetermined atmosphere. For this reason, the productivity is higher when many samples can be arranged on the heating stage or the heater jig.

In the sealing treatment step, it is difficult to seal a large number of samples at once because the conventional surface mount type piezoelectric vibrator has a large airtight sealing surface.

However, the surface-mounted piezoelectric vibrator of the present invention has a small airtight sealing surface. Therefore, it is possible to arrange and seal many samples at once in a limited chamber without taking up space.

Therefore, as compared with the conventional surface mount type piezoelectric vibrator, the surface mount type piezoelectric vibrator of the present invention increases the number of samples that can be sealed at one time, and improves the productivity.

[0060]

As is apparent from the above description, the terminal member of the surface mount type piezoelectric vibrator of the present invention is made of an insulating material such as ceramics, and has a terminal sealing surface for sealing at one end, It has a circular or polygonal recess at the end, and an electrode pad connected to the recess is installed on the bottom surface.

For this reason, the sealing surface becomes small and uniform bonding is easy. Further, also in the sealing process, it is possible to arrange and seal a large number of samples at once in a limited chamber without taking up space.

Therefore, as compared with the conventional surface mount type piezoelectric vibrator, the surface mount type piezoelectric vibrator of the present invention increases the number of samples that can be sealed at one time, and improves the productivity.

Further, the surface mount type piezoelectric vibrator of the present invention is
The surface area of the terminal member made of an insulating material such as ceramics, which generates a relatively large amount of gas and moisture generated in the container, is reduced. Then, by increasing the surface area of the case made of metal or glass in which the generation of gas and moisture is small, it is possible to suppress the generation of gas and moisture and highly stabilize the long-term change in frequency.

Further, the surface mount type piezoelectric vibrator of the present invention supports the piezoelectric body by using the supporting member. Therefore, it has excellent impact resistance.

Furthermore, in the conventional surface mount type piezoelectric vibrator, the lead wire for supporting the supporting member extends in the direction perpendicular to the mounting surface. Therefore, although the thickness of the lead wire is increased by the height of the lead wire, in the surface-mounted piezoelectric vibrator of the present invention, the lead wire supporting the support member is horizontal to the mounting surface,
A holding portion having a first slit for inserting and holding the corner portion of the rectangular piezoelectric body, and a fixing portion having a second slit for inserting the side portion of the rectangular piezoelectric body. Since it has a pair of supporting member structures, it is possible to reduce the thickness without affecting the thickness of the surface-mounted piezoelectric vibrator.

[Brief description of drawings]

FIG. 1 is a perspective view showing a surface-mounted piezoelectric vibrator according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a surface-mounted piezoelectric vibrator according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional surface mount piezoelectric vibrator.

FIG. 4 is a cross-sectional view showing a conventional surface mount piezoelectric vibrator.

FIG. 5 is a cross-sectional view showing a surface-mounted piezoelectric vibrator according to an example of the present invention, and is a drawing showing conduction between a support member in a terminal member and an electrode pad.

FIG. 6 is a cross-sectional view showing a surface-mounted piezoelectric vibrator according to an example of the present invention, showing a surface-mounted piezoelectric vibrator having electrode pads on both bottom and top surfaces.

FIG. 7 is a side view showing a surface mount type piezoelectric vibrator according to an embodiment of the present invention, showing a surface mount type piezoelectric vibrator fixed to an electrode pad of a terminal member and a metal case by soldering to a printed circuit board. It is the drawing shown.

[Explanation of symbols]

 11 Terminal Member 12 Case 13 Terminal Sealing Surface 14 Recess 15 Electrode Pad 16 Supporting Member 18 Solder 19 Piezoelectric Body 20 Printed Circuit Board 21 Lead Wire 22 Through Hole 23 Lid 24 Supporting Member 25 Stage 26 Conductive Adhesive

Claims (5)

[Claims] 1. A terminal member, which is integral with a lead wire, has a support member for supporting a piezoelectric body, an electrode pad connected to the lead wire through a through hole, and a terminal seal surface, and is joined to the terminal seal surface. A surface mount type piezoelectric vibrator, comprising: a case having a case sealing surface. 2. A terminal member and a case, wherein the terminal member is made of an insulating material having a substantially quadrangular shape, a terminal sealing surface for sealing is provided at one end, and a circular or polygonal recess is formed at the other end. An electrode pad connected to the concave portion is installed on the bottom surface, and the electrode pad is electrically connected to the support member in the terminal member, and the corner portion of the rectangular piezoelectric body is inserted into the support member. First to hold
Has a pair of supporting member structures each including a holding portion having a slit and a fixing portion having a second slit for inserting a long side portion of a rectangular piezoelectric body, and the supporting body is provided with the piezoelectric body. A case made of metal or glass, which is fixed in the lateral direction, has a case sealing surface at the opening end and has a hollow substantially rectangular shape, and by joining the case sealing surface and the terminal sealing surface, A surface mount type piezoelectric vibrator, characterized in that a predetermined atmosphere is created in the surface mount type piezoelectric vibrator. 3. A terminal member and a case, wherein the terminal member is made of an insulating material having a substantially quadrangular shape, a terminal sealing surface for sealing is provided at one end, and a circular or polygonal recess is provided at the other end. An electrode pad connected to the concave portion is installed on the bottom surface, and the electrode pad is electrically connected to the support member in the terminal member, and the corner portion of the rectangular piezoelectric body is inserted into the support member. First to hold
Has a pair of supporting member structures each including a holding portion having a slit and a fixing portion having a second slit for inserting a short side portion of a rectangular piezoelectric body, and the supporting body is provided with the piezoelectric body. A case made of metal or glass that is fixed in the longitudinal direction has a case sealing surface at the open end and has a hollow, almost square shape. By joining the case sealing surface and the terminal sealing surface, A surface-mounted piezoelectric vibrator, characterized in that a predetermined atmosphere is created in the mounted piezoelectric vibrator. 4. A recess comprising a terminal member and a case, the terminal member being made of an insulating material having a substantially quadrangular shape, a terminal sealing surface for sealing being provided at one end, and a circular or polygonal recess at the other end. An electrode pad connected to the recess is provided on the top and bottom surfaces, and the electrode pad is electrically connected to a support member in the terminal member, and the support member is provided with a corner portion of a rectangular piezoelectric body. It has a pair of support member structures composed of a holding portion having a first slit for inserting and holding and a fixing portion having a second slit for inserting the side portion of a rectangular piezoelectric body. , A case made of metal or glass with a piezoelectric body fixed to its supporting member has a case sealing surface at the open end and has a substantially rectangular shape, and joins the case sealing surface and the terminal sealing surface. Surface mount type A surface mount type piezoelectric vibrator, characterized in that a predetermined atmosphere is created in the piezoelectric vibrator. 5. The electrode pad provided on the bottom surface of the terminal member and the bottom surface of the case made of metal are soldered to the printed circuit board, claim 2, claim 3, and claim 3.
Alternatively, the surface-mounted piezoelectric vibrator according to claim 4.