JP2003032067A - Piezoelectric vibrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piezoelectric vibrator that can attain reduction in a mount area and attain sureness of mount on a substrate and surety of mount strength. SOLUTION: A cylinder 12 is placed in the middle of the piezoelectric vibrator 10, and an outer lead 18 folded in a crank shape is extracted from one-side end. Then, a flat electrode terminal 20 is connected to the outer lead 18 and connecting the electrode terminal 20 to an external substrate can attain electric conduction. A dummy terminal 26 and a couple of raised pieces 28 in continuity to the terminal 26 are provided to a side of the cylinder 12 opposite to the side on which the electrode terminal 20 is placed so as to position the cylinder 12 by contacting them to the outer shape of the cylinder 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric vibrator, and more particularly to a piezoelectric vibrator suitable for surface mounting on an external substrate.

[0002]

2. Description of the Related Art Conventionally, there is known a piezoelectric vibrating reed that obtains a predetermined frequency by applying a driving voltage through an excitation electrode formed on the surface of a piezoelectric material made of a thin plate such as quartz. Such a piezoelectric vibrating piece is housed in a container called a cylinder or the like and used as an IC (Integr
mounted circuit), resistors, capacitors, etc.

However, in the above-described piezoelectric vibrator, there are cases in which the shape of the container that houses the piezoelectric vibrating piece is special, and there are cases where lead wires must be inserted into through holes provided in the substrate, and other electronic parts are used. Differently, there is a problem that surface mounting cannot be performed using an automatic mounting machine.

In order to solve this problem, there is known a piezoelectric vibrator in which the periphery of a container accommodating a piezoelectric vibrating piece is molded with resin and surface mounting can be performed using an automatic mounting machine. 9 is a schematic plan view of a surface-mountable piezoelectric vibrator, FIG. 10 is a CC cross-sectional view of FIG. 9, and FIG. 11 is a bottom view of the piezoelectric vibrator of FIG.
2 is a DD sectional view in FIG. In addition, FIG.
15 is a perspective view of electrode terminals in the piezoelectric vibrator, and FIG.
FIG. 6 is a perspective view of a dummy electrode in the piezoelectric vibrator.

As shown in these figures, in a piezoelectric vibrator 1, a cylinder 2 serving as a container is installed in the center thereof, and a piezoelectric vibrating piece 3 is housed inside the cylinder 2. In the figure, the cylinder 2 is formed in a cylindrical shape, and a pair of outer leads 4 connected to the piezoelectric vibrating piece 3 are drawn out from one end face of the cylinder 2.

Electrode terminals 5 serving as lead frames for mounting on an external substrate are provided on the tip ends of the pair of outer leads 4 projecting from the end faces of the cylinder 2. The electrode terminal 5 is bent in a crank shape, one end of the electrode terminal 5 is a joint portion 5A with the outer lead 4, and the other side is a board mounting portion 5B.
The board mounting portion 5B is arranged so as to face the outside of the piezoelectric vibrator 1. Since there are two outer leads 4 protruding from the cylinder 2, two electrode terminals 5 corresponding to the outer leads 4 are similarly provided.

By the way, in the cylinder 2, a pair of dummy terminals 6 are provided on the end surface side opposite to the side where the outer lead 4 projects. The dummy terminal is formed by bending a thin sheet metal into a V shape. One end of the dummy terminal is a fixed side 6A to the piezoelectric vibrator 1 and the other side is the same as the electrode terminal 5 and the piezoelectric vibrator 1 is provided. The board mounting portion 6B extends to the outside. By disposing the electrode terminals 5 and the dummy terminals 6 at the corners of the piezoelectric vibrator 1, the piezoelectric vibrator 1 can be reliably mounted on the external substrate.

The piezoelectric vibrator 1 is used for the purpose of maintaining the positional relationship among the cylinder 2, the outer lead 4, the electrode terminal 5, and the dummy terminal 6 and protecting them from the outside and enabling mounting by an automatic mounting machine. The main body of is molded with resin, and the components of the piezoelectric vibrator 1 described above are all sealed with resin except the board mounting portions of the electrode terminals 5 and the dummy terminals 6.

[0009]

However, the above-described piezoelectric vibrator 1 has the following problems.
That is, in recent years, miniaturization of products using electronic components is progressing, and in order to meet this demand, there is a demand for miniaturization of the substrate and eventually reduction of the mounting area of the electronic components. Further, in the piezoelectric vibrator 1, the board mounting portions of the electrode terminals 5 and the dummy terminals 6 are projected from the outer edge thereof, and there is a problem in that the projected portions increase the board mounting area.

Further, as shown in FIG. 11, although the electrode terminals 5 and the dummy terminals 6 are arranged at the corners of the piezoelectric vibrator 1, the areas of the board mounting portions of the electrode terminals 5 and the dummy terminals 6 are uniform. There wasn't. Therefore, when the piezoelectric vibrator 1 is mounted on the board by the automatic mounting machine and then the reflow process is passed, the piezoelectric vibrator 1 is moved from the regular position on the board due to the difference in the area of the board mounting portion, and the conduction failure or the like occurs. There could be problems such as

As a problem peculiar to the dummy terminal, the board mounting portion 6B of the dummy terminal 6 is formed so as to be bifurcated after a certain distance from the bent root as shown in FIG. The length of the board mounting portion 6B cannot be sufficiently secured, which may reduce the mounting strength on the board. The joint 6A also has a simple upright shape as shown in FIG. 14 (FIG. 14). However, the resin for forming the vibrator main body is on the tip side of the cylinder 12, that is, outside the joint 6A. (In the direction of the arrow), the joint 6A becomes a wall, and the fluidity of the resin decreases,
There was a risk of problems such as sink marks and nests in the vibrator body. Further, in the dummy terminal 6, the joint portion 6A is present in the resin, and the board mounting portion 6B is fixed to the board side. Therefore, when an external force is applied to the substrate and warpage occurs, the force due to the warp of the board causes the joint portion 6A to move. There is a possibility that cracks may occur in the vibrator body by being added to the resin side via the. Further, since the cylinder that accommodates the piezoelectric vibrating piece has a cylindrical shape, it easily rolls due to a slight inclination or external force, and as a result, it may be difficult to position the cylinder 2 before resin injection molding.

On the other hand, the problem peculiar to the electrode terminal is that the electrode terminal must be bent in a crank shape, and if there is a large error in the angle or height of the bending, or if the cylinder 12 is in an inclined posture. Therefore, the outer shape of the cylinder 12 may be exposed from the lower side of the vibrator body and short-circuited with the pattern of the mounting substrate. Further, the outer lead protruding from the cylinder 12 is welded to the joint portion 5A bent in a crank shape. However, since the bending portion forming the crank portion is located at one end of the joint portion 5A, a large welding jig is provided. Was difficult to apply. Therefore, there is a problem that it is difficult to apply large energy and pressing force to the outer lead 4 and the joint portion 5A during the welding process.

It is an object of the present invention to provide a piezoelectric vibrator that can reduce the mounting area, ensure the mounting on a substrate, and secure the mounting strength, focusing on the above-mentioned conventional problems.

[0014]

A piezoelectric vibrator according to the present invention comprises a piezoelectric body, a piezoelectric vibrating piece housed in a container, an electrode terminal protruding from the vibrator body and mounted on an external substrate, and a dummy. A piezoelectric vibrator having a terminal, wherein the contact areas of the electrode terminal and the dummy terminal to the external substrate are made equal. The contact shape of the electrode terminal and the dummy terminal with respect to the external substrate is preferably the same shape, and the longitudinal direction of the contact shape is preferably orthogonal to the longitudinal direction of the vibrator body.

In another piezoelectric vibrator according to the present invention, the piezoelectric body has a piezoelectric vibrating piece housed in a container, and a piezoelectric vibrating piece which is arranged at a corner of the container and protrudes from the vibrator body to be mounted on an external substrate. A piezoelectric vibrator provided with an electrode terminal and a dummy terminal, wherein a circumference of the container in which the piezoelectric vibrating piece is housed is molded with resin, and a pair of U-shaped thin plate legs are bent. Then, the leg portions are used as the dummy terminals, the U-shaped tip portions are embedded in the resin, and the leg portions are used as anchor members.

Further, in another piezoelectric vibrator according to the present invention,
A piezoelectric vibrator, in which a vibrator body is provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at the corners of the container and project from the vibrator body to be mounted on an external substrate. Then, a thin plate is arranged in the lower part of the container, and standing pieces capable of supporting the container are formed on both sides of the end of the thin plate, and the other end of the thin plate is formed into a fork, which is used as the dummy terminal. Configured to do so.

Then, in another piezoelectric vibrator according to the present invention,
A piezoelectric vibrator, in which a vibrator body is provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at the corners of the container and project from the vibrator body to be mounted on an external substrate. Then, the periphery of the container in which the piezoelectric vibrating piece is housed is molded with resin, and the outer lead that is pulled out from the piezoelectric vibrating piece and protrudes from the container is bent in a crank shape, and a joint portion is formed at the tip of the outer lead. At the same time, the electrode terminal that comes into contact with the joint is disposed below the joint, and a recess that is buried in the resin is formed in the electrode terminal. The joint is
It is desirable that the container be bent to the position of the bottom surface.

Further, in another piezoelectric vibrator according to the present invention, the piezoelectric body has a piezoelectric vibrating piece housed in a container, and a piezoelectric vibrating piece which is disposed at a corner of the container and protrudes from the vibrator body to be mounted on an external substrate. A piezoelectric vibrator provided with an electrode terminal and a dummy terminal, wherein the electrode terminal is bent and formed in a U-shaped cross section, and the electrode terminal is pulled out from the piezoelectric vibrating piece to one side of a standing piece and protrudes from the container. The outer leads are brought into contact with each other, and the central portion of the terminal adjacent to the standing piece is arranged to be exposed from the vibrator body.

According to the piezoelectric vibrator thus constructed, if the contact areas of the electrode terminals and the dummy terminals to the external substrate are equalized, the self-alignment action allows the solder to be melted in the reflow step to have a larger area. It is possible to prevent the piezoelectric vibrator from moving. Therefore, even after the piezoelectric vibrator is mounted on the substrate, it can be surely connected to the substrate even if it is put into the reflow process. Further, in the contact shape when the electrode terminal or the dummy terminal contacts the external substrate, if the longitudinal direction of the contact shape is orthogonal to the longitudinal direction of the vibrator body, an external force is applied to the external substrate on which the piezoelectric vibrator is mounted. Even if the external substrate is warped along the longitudinal direction of the vibrator body, the distance between the electrode terminal and the dummy terminal can be set wide, so that the warpage of the external substrate can be absorbed by the entire piezoelectric vibrator. It will be possible. Therefore, it is possible to prevent an excessive force from being applied to the contact portion of the electrode terminal and the dummy terminal with the external substrate. Furthermore, since the length of the electrode terminal or dummy terminal in contact with the external substrate increases, the amount of solder increases and the bonding strength can be improved.

If a pair of leg portions of the U-shaped thin plate are bent and bent, the leg portions are used as dummy terminals, and the thin plates are arranged so that the tips of the leg portions project from the vibrator main body. Since the dummy terminals composed of the pair of legs are integrated, it is possible to eliminate the need to individually position the pair of dummy terminals. Further, since the joining portion is formed by bending the U-shaped tip portion, it is possible to insert the joining portion between the leg portion tip side and the container side. For this reason, if a resin injection gate is provided outside the joint,
The resin injected from the gate can easily flow to the container side without hindering the joint, preventing sink marks on the surface of the vibrator body or forming nests inside the vibrator body. You can Even if an external force is applied to the substrate and the substrate is warped, the force is not transmitted to the resin side and the bent root of the electrode terminal absorbs the force, so that the main body is not cracked. Can be prevented.

Further, a thin plate is arranged in the lower portion of the container, and standing pieces capable of supporting the container are formed on both sides of the end of the thin plate, and the other end of the thin plate is formed into a fork, and the dummy terminal is formed. In this case, since the container is held by the rising pieces of the thin plate, it is possible to prevent the container from rolling due to external force or inclination before the resin is injected even if the container is cylindrical. And since the standing piece is located in the resin to prevent it from coming off, it is not necessary to provide an anchor member on the end surface side of the container, and even if external stress is applied to the dummy terminal, this stress is not transmitted to the anchor member. It is possible to prevent cracks from being generated in the vibrator main body made of resin. Further, since it is not necessary to provide the anchor member, the total length can be shortened by the thickness of the anchor member, and the piezoelectric vibrator can be downsized.

Then, the outer lead which is pulled out from the piezoelectric vibrating piece and protrudes from the container is bent into a crank shape,
Since the joint portion is formed at the tip of the outer lead, the electrode terminal that is in contact with the joint portion is disposed below the joint portion, and the concave portion that is buried in the resin is formed in the electrode terminal. Since the electrode terminal has no bent portion, it is possible to eliminate the need for management such as the bending angle and height. The recess for preventing the electrode terminal from coming off may be formed by half punching or etching. Further, since the electrode terminal is flat, there is no obstacle in the vicinity thereof, the electrode for welding can be made large, and an external force sufficient for welding can be applied. Further, since the electrode terminal is not projected outward from the joint portion of the outer lead, the total length of the piezoelectric vibrator is up to the tip of the outer lead, and the piezoelectric vibrator can be miniaturized.

If the joint portion is bent to the position of the bottom surface of the container, the joint portion serves to prevent the container from rotating, and the container can be prevented from rolling due to external force or inclination. Also, since the container is kept horizontal, if such a container is mounted on the electrode terminals or dummy terminals,
The resin corresponding to these thicknesses is uniformly formed on the lower side of the container, which makes it possible to prevent the container from being exposed to the outside of the vibrator body, and the container comes into contact with the external substrate to cause a short circuit. Can be prevented.

Then, the electrode terminal is bent to have a U-shaped cross section, and an outer lead that is pulled out from the piezoelectric vibrating piece and protrudes from the container is brought into contact with one side of the upright piece of the electrode terminal and is adjacent to the upright piece. If the central part of the terminal is arranged so as to be exposed from the vibrator main body, the electrode terminal will not protrude outward from the outer lead, so the total length of the piezoelectric vibrator is up to the tip of the outer lead. The miniaturization of the child can be achieved. Also, by exposing the center part of the terminal, where the standing pieces are formed on both ends, from the body of the vibrator, the solder for mounting sticks from the board mounting surface to the position where the outer lead is pulled out, and a sufficient contact area can be obtained. The mounting strength can be improved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific preferred embodiments of the piezoelectric vibrator according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a top view showing the structure of the piezoelectric vibrator according to the present embodiment, and FIG. 2 is a front view of the piezoelectric vibrator.
FIG. 1A is an overall view of the piezoelectric vibrator, and FIG. 2B is an enlarged view of part A in FIG. 1A.

As shown in these figures, in the piezoelectric vibrator 10 according to the present embodiment, a cylinder 12 serving as a container is arranged at the center thereof. The cylinder 12 has a cylindrical outer shape, and a thin plate-shaped piezoelectric vibrating piece 14 capable of generating a predetermined vibration frequency by applying a voltage is housed inside the cylinder 12. One end surface of the cylinder 12 is an insertion side for inserting the piezoelectric vibrating piece 14 into the cylinder 12, and a lid 16 for sealing the cylinder 12 has a pair of outer leads 18 inserted therein. Then, insert the lid 16,
One end portion of the outer lead 18 located inside the cylinder 12 is connected to the piezoelectric vibrating piece 14, and
By applying a voltage to the other end portion of the outer lead 18 protruding outwardly of 2, the natural frequency is obtained from the piezoelectric vibrating piece 14 housed in the cylinder 12. The outer lead 18 protruding from the cylinder 12 is formed into a crank shape by bending as shown in FIG. 2, and the tip of the outer lead 18 is used as a joint 19 to be welded. An electrode terminal 20 is provided below the joint portion 19. In addition, in FIG.
The bending angle of the outer lead 18 depends on the piezoelectric vibrator 10.
It may be arbitrarily set according to conditions such as the dimension in the longitudinal direction or the shape of electrode terminal 20. Further, in the piezoelectric vibrator 10, the periphery of the cylinder 12 is molded with resin 21. By molding the periphery of the cylinder 12 with the resin 21, the piezoelectric vibrator 10
Is designed to be mountable on an automatic mounter so that it can be surface-mounted on an external substrate, or hold an electrode terminal 20 welded to the outer lead 18, or hold a dummy terminal to be described later.

FIG. 3 is a perspective view showing the shape of the electrode terminal, FIG. 1 (1) is a single shape of the electrode terminal, and FIG. 3 (2) shows the joined state of the electrode terminal and the outer lead. Show. As shown in FIG. 1A, the pair of electrode terminals 20 is
It has a bilaterally symmetrical shape, and a recess 22 is formed on the back surface side at one end thereof. Then, as described above, when the periphery of the cylinder 12 is molded with the resin 21, the resin 21 enters into the recess 22 and the tongue piece 24 is taken into the resin 21. By thus burying the concave portion 22 with the resin 21 and incorporating the tongue piece 24 into the resin 21, the electrode terminal 20 is fixed to the vibrator body, and the vibrator body is subjected to external force such as shock or vibration. The electrode terminal 20 is prevented from falling off. The specific depth of the recess 22 depends on the fluidity of the resin 21 used, but is normally set to about 0.1 mm. Then, in order to form the concave portion 22 on the surface of the electrode terminal 20 having a uniform thickness, a method such as half punching or etching may be used.

In this way, if the outer lead 18 protruding from the cylinder 12 is bent in a crank shape to the position of the bottom surface of the cylinder 12, and the electrode terminal 20 connected to this is formed in a flat plate shape, on the cylinder 12 side. Since the outer lead 18 is formed, even if an external force is applied or the posture is tilted, the tip of the outer lead 18 contacts the floor surface, so that the cylinder 12 can be prevented from rolling. .

Further, if the bending height of the joint portion 19 is set so as to reach the bottom surface of the cylinder 12, the cylinder 12 can be kept in a horizontal state. Therefore, if the cylinder 12 is held by a dummy terminal, which will be described later, and the joint portion 19 at the tip of the outer lead 18 is brought into contact with the electrode terminal 20, the cylinder 12 can be maintained in a horizontal state, and the lower side thereof. A void corresponding to the thickness of the electrode terminal 20 and the dummy terminal is formed. And the resin 21 after
Since the cylinder 12 is not exposed from the bottom surface by the injection of the resin and the void is filled with the resin 21, it is possible to prevent the cylinder 12 from coming into contact with the pattern of the mounting board, and to prevent a short circuit between both. Can be prevented.

On the other hand, in the electrode terminal 20, since there is no bent portion in its shape, there is nothing that interferes with the surroundings. Therefore, a large welding jig can be used, a sufficient amount of heat and a pressing force can be applied to the joint portion 19 and the electrode terminal 20, and a sufficient joint strength of both can be obtained. Further, as shown in FIG. 2A, the joint portion 19 of the lead frame 18 is connected to the electrode terminal 2
Since it completely overlaps with 0, there is no member protruding beyond the length of the electrode terminal 20, and therefore the size of the vibrator main body in the longitudinal direction can be reduced.

FIG. 4 is a perspective view showing the shape of the dummy terminal. As shown in the figure, in the cylinder 12, a dummy terminal 26 is arranged on the side opposite to the side where the electrode terminal 20 is formed. The dummy terminal 26 is formed of a thin metal plate 32. On the opposite side of the position where the dummy terminal 26 is formed, a pair of upstanding pieces 28 are provided at both ends, and the opening angle is , Is set to a value that only guides the outer shape of the cylinder 12. A standing piece 28 for holding the cylinder 12 is formed on one side of the thin plate 32, and a forked shape as shown in a broken line frame 33 in the drawing is formed on the other side of the thin plate 32. If the forked ends of the thin plate 32 are the dummy terminals 26, the thin plate 32 forming the dummy terminal 26 can position the cylinder 12. After the cylinder 12 is positioned, the resin body 21 may be injected into the injection process of the resin 21 to form the vibrator body made of the resin 21.

In the meantime, in the dummy terminal 26, it is necessary to prevent the resin 21 from coming off, but in the case of this embodiment, the pair of upright pieces 28 are taken into the resin 21 to prevent the removal. Therefore, it is not necessary to form an anchor member in front of the end face of the cylinder 12 as in the conventional case, and the total length of the piezoelectric vibrator 10 can be shortened by the plate thickness of the anchor member.

FIG. 5 is a perspective view showing another shape of the dummy terminal. In the figure, a pair of leg portions of a thin plate 34 formed in a substantially U shape are bent and raised, and the leg portions shown in a broken line frame 35 in the figure are used as dummy terminals 36. Then, the tip of the substantially U-shaped thin plate 34 is used as an anchor member 38, and is arranged so as to follow the end surface of the cylinder 12, and is inserted into the injection process of the resin 21 while maintaining this state, and the vibrator made of the resin 21 If the main body is formed, unlike the conventional dummy terminal, the leg portion is formed from the bending root, so it is possible to secure a long t1 dimension shown in FIG. 1A (compared to the conventional length). About 3 times). Therefore, the contact portion of the solder for connecting to the external board is widened, and the mounting strength for the external board can be secured. Further, even if an external force is generated on the external substrate, the force is not transmitted to the resin side, and the force can be absorbed by the bent root of the electrode terminal. Therefore, there is no risk of cracks in the resin body, and the resin thickness can be reduced.

Further, unlike the conventional dummy terminal, since the legs are formed from the bending root, it is possible to reduce the thickness t2 of the resin 21 forming the vibrator main body as shown in FIG. Therefore, it becomes possible to reduce the dimension of the vibrator body in the longitudinal direction by adjusting the length of the legs. By the way, since the leg portions of the pair of dummy terminals 36 described above are formed from the bent roots, each of them has an independent shape. Therefore, the dummy terminal 36 may be matched with the shape of the electrode terminal 20.

FIG. 6 is a rear view of a piezoelectric vibrator in which the shape of a pair of dummy terminals formed of a thin plate is the same as the shape of the electrode terminals. As shown in the figure, if the contact shapes of the electrode terminals 20 and the dummy terminals 36 provided on the piezoelectric vibrator 40 with respect to the external substrate are the same, the piezoelectric vibrator 40
When the external substrate mounted with is mounted in the reflow step, the piezoelectric vibrator can be prevented from moving when the solder is melted in the reflow step due to the self-alignment action. Therefore, the electrode terminal 20 and the terminal on the external substrate are not separated from each other, and electrical conduction can be surely achieved. In the embodiment of FIG. 6, the electrode terminal 20 and the dummy terminal 36 have the same shape as described above, but the shape is not limited to this.
While the contact areas of the dummy terminals 36 and the external substrate are equal, the outer diameter dimensions may be different.
Even if the contact areas of the electrode terminal 20 and the dummy terminal 36 with respect to the external substrate are equal to each other in this way, the piezoelectric vibrator can be prevented from moving when the solder is melted in the reflow process due to the self-alignment action. .

In this embodiment, the specification in which the pair of dummy terminals 36 are connected by the anchor member 38 is applied. However, the present invention is not limited to this form. For example, the pair of dummy terminals 36 may be separated. And may be applied. At this time, unlike the specifications connected by the anchor member 38, positioning is required for each individual dummy terminal 36.

FIG. 7 is a rear view when the electrode terminals and the dummy terminals have the same shape and the directions thereof are changed by 90 degrees. Note that, in FIG. 7, the shapes and directions of the electrode terminals and the dummy terminals are changed by 90 degrees as described above with respect to FIG. 6, so the same numbers as in FIG. In FIG. 1A, the electrode terminal 20 and the dummy terminal 36 are set to have the same shape, and the orientations of the terminals are set so as to match the longitudinal direction of the piezoelectric vibrator 40. By arranging the electrode terminal 20 and the dummy terminal 36 in this way, the piezoelectric vibrator 40 can be prevented from moving when the solder is melted in the reflow process due to the self-alignment action similar to the effect described in FIG. it can. Therefore, the electrode terminal 2
It is possible to ensure electrical continuity without separating 0 and the terminal on the external substrate.

On the other hand, as shown in FIG. 2B, if the longitudinal direction of the terminal of each of the electrode terminal 20 and the dummy terminal 36 and the longitudinal direction of the body of the piezoelectric vibrator 40 are arranged orthogonal to each other, t3 is obtained. <T4. Therefore, even if external force is applied to the external substrate on which the piezoelectric vibrator 40 is mounted and warpage occurs along the longitudinal direction of the vibrator main body in the external substrate, in the case of FIG. Since the distance can be set wide, it is possible to absorb the warp of the external substrate with a longer dimension (t4).
Therefore, even if the external substrate is warped, the terminals of the piezoelectric vibrator 40 can be prevented from separating from the external substrate.

By the way, in the present embodiment, the outer lead 18 and the electrode terminal 20 which are bent into a crank shape are formed.
Instead of this, it is possible to use other forms. Figure 8
It is explanatory drawing which shows the other form of the electrode terminal side. Same figure (1)
The outer lead 42 is linearly drawn from the cylinder 12 as shown in FIG. Then, a thin plate made of metal is formed into a U-shaped cross section as an electrode terminal 46, and its height is set to a dimension from the bottom surface of the piezoelectric vibrator 44 to the outer lead 42. Then, the terminal central portion 48 of the electrode terminal 46 formed in such a size is arranged so as to be exposed from the vibrator body.

By using such a structure, the solder 49 comes into close contact with the board mounting surface up to the height at which the outer lead 42 is pulled out, and a sufficient contact area can be obtained to improve the mounting strength. Further, if the electrode terminal 46 is used, the entire length of the piezoelectric vibrator is up to the tip of the outer lead 42, so that the piezoelectric vibrator can be downsized.

[0041]

As described above, according to the present invention, the vibrator body has the piezoelectric vibrating piece housed in the container, and the electrode terminal and the dummy terminal which project from the vibrator body and are mounted on the external substrate. In the piezoelectric vibrator provided with, the contact area of the electrode terminal and the dummy terminal to the external substrate is equalized,

A piezoelectric vibrating piece provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at the corners of the container and project from the vibrating body to be mounted on an external substrate. As a child, the periphery of the container in which the piezoelectric vibrating piece is housed is molded with resin, and a pair of leg portions of a U-shaped thin plate are bent and raised, and these leg portions are used as the dummy terminals. The U-shaped tip is embedded in the resin, and the U-shaped tip is used as an anchor member,

Further, the piezoelectric body is provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at the corners of the container and project from the vibrator body to be mounted on an external substrate. In the vibrator, a thin plate is arranged in the lower part of the container, and standing pieces capable of supporting the container are formed on both sides of the end of the thin plate, and the other end of the thin plate is formed into two forks. The tip of the shape is used as the dummy terminal,

The piezoelectric body is provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at the corners of the container and project from the vibrator body to be mounted on an external substrate. A vibrator, in which the periphery of the container in which the piezoelectric vibrating piece is housed is molded with resin, and the outer lead that is pulled out from the piezoelectric vibrating piece and protrudes from the container is bent in a crank shape, and is attached to the tip of the outer lead. Along with forming a joint, the electrode terminal that is in contact with the joint is arranged on the lower side of the joint, and a recess buried in the resin is formed in the electrode terminal,

Further, the piezoelectric body is provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at the corners of the container and project from the vibrator body to be mounted on an external substrate. A vibrator, wherein the electrode terminal is bent and formed in a U-shaped cross section, and one side of the standing piece of the electrode terminal is brought into contact with an outer lead that is pulled out from the piezoelectric vibrating piece and protrudes from the container. Since the central portion of the terminal adjacent to is arranged to be exposed from the vibrator body,

It is possible to reduce the mounting area, ensure the mounting on the substrate, and secure the mounting strength.

[Brief description of drawings]

FIG. 1 is a top view showing a structure of a piezoelectric vibrator according to the present embodiment.

FIG. 2 is a front view of the piezoelectric vibrator.

FIG. 3 is a perspective view showing a shape of an electrode terminal.

FIG. 4 is a perspective view showing a shape of a dummy terminal.

FIG. 5 is a perspective view showing another shape of the dummy terminal.

FIG. 6 shows a rear view of a piezoelectric vibrator in which the shape of a pair of dummy terminals formed from a thin plate is matched with the shape of electrode terminals.

FIG. 7 is a rear view when the electrode terminals and the dummy terminals have the same shape and the directions thereof are changed by 90 degrees.

FIG. 8 is an explanatory diagram showing another form on the electrode terminal side.

FIG. 9 is a schematic plan view of a surface-mountable piezoelectric vibrator.

10 is a sectional view taken along line CC in FIG.

11 is a bottom view of the piezoelectric vibrator shown in FIG.

12 is a DD cross-sectional view of FIG.

FIG. 13 is a perspective view of electrode terminals in the piezoelectric vibrator.

FIG. 14 is a perspective view of a dummy electrode in the piezoelectric vibrator.

[Explanation of symbols]

1 ... Piezoelectric vibrator, 2 ......... Cylinder, 3 ......... Piezoelectric vibrating piece, 4 ......... Outer lead, 5 ...
5A ... Joining portion, 5B ......... Board mounting portion, 6 ... Dummy terminal, 6A ...... Joining portion, 6B ......... Board mounting portion,
10 ... Piezoelectric vibrator, 12 ......... Cylinder, 14 ...
Piezoelectric vibrating piece, 16 ... Lid, 18 ... Outer lead, 19 ... Joint, 20 ... Electrode terminal, 21 ...
… Resin, 22 ……… Recess, 24… Tongue, 26…
Dummy terminal, 28 ......... Standing piece, 32 ......... Thin plate, 33
……… Dashed line frame, 34 ……… Thin plate, 35 ……… Dashed line frame, 3
6 ... Dummy terminal, 38 ... Anchor member, 40 ...
... Piezoelectric vibrator, 42 ......... Outer lead, 44 ...
Piezoelectric vibrator, 46 ... Electrode terminal, 48 ... Central part of the terminal, 49 ... Solder.

Claims (8)

[Claims] 1. A piezoelectric vibrator, comprising: a vibrator main body provided with a piezoelectric vibrating piece housed in a container; electrode terminals protruding from the vibrator main body for mounting on an external substrate; and dummy terminals. A piezoelectric vibrator, wherein the contact areas of the electrode terminals and the dummy terminals with the external substrate are made equal. 2. The piezoelectric vibrator according to claim 1, wherein the contact shape of the electrode terminal and the dummy terminal with respect to the external substrate is the same shape. 3. The longitudinal direction of the contact shape is orthogonal to the longitudinal direction of the vibrator body.
The piezoelectric vibrator according to item 1. 4. A vibrator main body is provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at corners of the container and project from the vibrator main body to be mounted on an external substrate. A piezoelectric vibrator, in which the circumference of the container in which the piezoelectric vibrating piece is housed is molded with resin, and a pair of leg portions of a U-shaped thin plate are bent and raised, and these leg portions are connected to the dummy terminals. At the same time, the U-shaped tip portion is embedded in the resin, and this is used as an anchor member. 5. A vibrator main body is provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at the corners of the container and project from the vibrator main body to be mounted on an external substrate. A piezoelectric vibrator, a thin plate is arranged at the bottom of the container, and standing pieces that can support the container are formed on both sides of the end of the thin plate, and the other end of the thin plate is formed into a bifurcated shape, A piezoelectric vibrator, wherein the bifurcated tip portion is used as the dummy terminal. 6. The vibrator main body is provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at the corners of the container and project from the vibrator main body to be mounted on an external substrate. A piezoelectric vibrator, the periphery of the container in which the piezoelectric vibrating piece is housed is molded with resin, and the outer lead that is pulled out from the piezoelectric vibrating piece and protrudes from the container is bent in a crank shape, and the tip of the outer lead is formed. A piezoelectric vibration characterized in that a joint portion is formed on the underside of the joint portion, and the electrode terminal that comes into contact with the joint portion is disposed below the joint portion, and a concave portion that is buried in the resin is formed in the electrode terminal. Child. 7. The piezoelectric vibrator according to claim 6, wherein the joint portion is bent to a position of a bottom surface of the container. 8. The vibrator main body is provided with a piezoelectric vibrating piece housed in a container, and electrode terminals and dummy terminals which are arranged at the corners of the container and project from the vibrator main body to be mounted on an external substrate. A piezoelectric vibrator, wherein the electrode terminal is bent to have a U-shaped cross section, and an outer lead that is pulled out from the piezoelectric vibrating piece and protrudes from the container is brought into contact with one side of the standing piece of the electrode terminal, and A piezoelectric vibrator, wherein a central portion of a terminal adjacent to one piece is arranged to be exposed from the vibrator body.