JPH07221582A - Piezoelectric component - Google Patents

Abstract

PURPOSE:To obtain a piezoelectric component operated stably over a long period with excellent durability. CONSTITUTION:The piezoelectric component is a component in which the arrangement of a piezoelectric resonator 10 and terminal boards 11 having the resonator 10 inbetween or the like is contained in a protection case 12 having an opening on one side. The protection case 12 is assembled by combining a flat plate 14 and a main body 13 having arranged components 19 comprising the piezoelectric resonator 10 and the terminal boards 19 or the like inbetween with a cover 18 along a face in parallel with the direction of component holding in between by the components 19 and the main body 13. A holding stress of the arranged components 19 acts like a shearing stress in parallel with a combined face 14a of the protection case 12, then no exfoliation is caused on the combined face 14a and deviation in the combined face 14a is comparatively hardly caused. Moreover, an area of the combined components is easily secured. Thus, the protection case 12 is hardly disassembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric component, and more particularly to a piezoelectric component used as an oscillator of an information processing device such as a computer and a filter of a communication / reception device such as a radio, a television and a wireless device.

[0002]

2. Description of the Related Art A piezoelectric body made of ceramics or the like has a unique mechanical resonance frequency determined by its shape, material, etc., and has a maximum amplitude when the cycle of the alternating current applied and the unique resonance frequency match. Then, by converting this into an electric signal again, a constant frequency is selectively extracted. The piezoelectric body having such a function is called a piezoelectric resonator, and a piezoelectric component having the piezoelectric resonator incorporated therein functions as an oscillator of an information processing device such as a computer or a filter of a receiver such as a television. Plays.
When the piezoelectric component is used in a relatively low frequency range, a vibration mode called a spreading vibration mode is usually used.

The piezoelectric component used for this oscillator or the like will be specifically described. First, the configuration and vibration state of the piezoelectric component when a single piezoelectric resonator is used will be described. FIG. 4A is an exploded perspective view showing a conventional piezoelectric component having one piezoelectric resonator, and FIG.
Is a schematic cross-sectional view thereof, and in the figure, 10 indicates a piezoelectric resonator.

As shown in FIG. 4, the piezoelectric resonator 10 having the vibrating electrodes 10a formed on both main surfaces thereof has a protrusion 11 at the center of the upper portion of the terminal plate 11 excluding the lead portion 11b.
The center portion of the vibration is clamped by the terminal plate 11 on which a is formed, and the electrical contact between the vibrating electrode 10a formed on the surface of the piezoelectric resonator 10 and the terminal plate 11 is maintained in such a clamped state. It is kept. Then, the piezoelectric resonator 10 and the terminal plate 11 are housed in a sealed state in a protective case 15 composed of a protective case body 16, a protective case flat plate 17 and a lid 18.

With such a structure, when the piezoelectric resonator 10 spreads and vibrates in a vibration mode, the vibration electrode 10a of the piezoelectric resonator 10 is centered on a portion serving as the central axis of the piezoelectric resonator 10. Since it vibrates in a direction parallel to the formed main surface, if a portion other than the central point comes into contact with an object, the vibration is significantly hindered and it cannot be supported at a point other than the central portion of the piezoelectric resonator 10. Is.

By applying an alternating current through the lead-out lead portion 11b of the terminal plate 11 of the piezoelectric component thus constructed, the piezoelectric resonator 10 sandwiched by the terminal plates 11 resonates and functions as a resonator or the like. It will be.

Next, a method of housing the piezoelectric resonator 10 and the terminal plate 11 in the protective case 15 will be described.

First, the piezoelectric resonator 10 and the terminal plate 11 are shown in FIG.
The protective case main body 1 is arranged in the order shown in (a), a spring or the like is added if necessary, and the piezoelectric resonator 10, the terminal plate 11 and the like are joined to the lid 18 in the arranged state.
6 is covered with a protective case flat plate 17b, and the protective case body 16 and the protective case flat plate 17b are joined to assemble the piezoelectric component.

FIG. 5 is a perspective view showing only the protective case 15 shown in FIG. 4, but as shown in FIG. 5, in the prior art, the joint surface 16a of the protective case body 16 is conventionally used.
A part of the main surface 17a (corresponding to the hidden surface in FIG. 5) of the protective case flat plate 17 is joined to assemble the piezoelectric component.

In the piezoelectric component thus obtained, the joint surface 1 between the protective case body 16 and the protective case flat plate 17 is formed.
6a is a surface perpendicular to the sandwiching direction A of the piezoelectric resonator 10, and tensile stress acts on the joint surface 16a.

The tensile stress acts on the joint surface 16a as described above, because it is easy to confirm the joint condition at the time of joint and the joint surface is one surface. This can be done easily.

[0012]

However, recently, miniaturization of the piezoelectric component has become important, and the miniaturization of the protective case 15,
Since the wall thickness is being reduced, the area of the joint surface 16a is decreasing.

In the above-described conventional piezoelectric component, the protective case body 16 and the protective case flat plate 17 are joined at the joint surface 16a perpendicular to the sandwiching direction of the piezoelectric resonator 10, and the joint area is also as described above. Since the bonding surface 16a that sandwiches the piezoelectric resonator 10 has a small bonding strength, the bonding surface 16a of the protective case 15 easily peels off after long-term use.
There was a problem that it became easier to dismantle.

Some piezoelectric components having two or more elements are also assembled by the same assembling method as in the case of the above-mentioned one element. In this case as well, in the joint surface 16a of the protective case 15 as in the case of the one element. However, there is a problem that the bonding strength of the is small.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a piezoelectric component having excellent durability, in which the protective case is not disassembled and the protective case is not disassembled even when used for a long time. Has an aim.

[0016]

In order to achieve the above object, a piezoelectric component according to the present invention is housed in a state in which a piezoelectric resonator, a terminal plate and the like are arranged and sandwiched in a protective case having an opening on one surface. In the piezoelectric component, a flat plate that constitutes at least one surface of a pair of facing surfaces of the protective case that sandwiches the array component including the piezoelectric resonator and the terminal plate is arranged in the sandwiching direction of the array component. The protective case is assembled by being joined to other members of the protective case via parallel surfaces.

[0017]

According to the piezoelectric component having the above-mentioned structure, the piezoelectric component is housed in a state in which the piezoelectric resonator, the terminal plate and the like are arranged and sandwiched in a protective case having an opening on one surface. A flat plate forming at least one of a pair of facing surfaces of the protective case that holds the arrayed component such as the terminal plate or the like sandwiches a flat plate that is parallel to the sandwiching direction of the arrayed component from another surface of the protective case. Since the protective case is assembled by being joined with a member, a shear stress parallel to the joint surface acts on the joint surface of the protective case, and the same magnitude of stress acts as tensile stress. As a result, there is no peeling of the joint surface and the joint surface does not easily shift. Further, since the flat plate is a member for sandwiching the arrayed components, it is usually configured to be sufficiently thick, and therefore, a large bonding area can be obtained and a bonding strength can be increased. The details will be described below.

FIG. 1 is a perspective view showing a protective case 12 used in a piezoelectric component according to the present invention.
2 is a protective case main body 13, a protective case flat plate 14 and a lid 1.
It is composed of 8. After the protective case 12 is assembled, the sandwiching stress A of the arrayed components acts in parallel with the joint surface 14a, which is the side surface of the protective case flat plate 14, and therefore, after the joint surface 14a is joined, Acts as shear stress.

It is considered that the sandwiching stress A itself acts in substantially the same manner in both the conventional piezoelectric component and the piezoelectric component of the present invention. Therefore, in the conventional protective case 15, a tensile stress perpendicular to the joint surface 16a of the protective case 15 acts, and the joint surface 16a easily separates, whereas in the protective case 12 of the present invention, , Joining surface 14
Since shearing stress parallel to a acts, it does not peel off, and the displacement of the joint surface 14a is relatively unlikely to occur. Therefore, the protective case 12 is difficult to disassemble, and the piezoelectric component is stably operated for a long period of time. Acts as a piezoelectric component with excellent durability.

Further, since the protective case flat plate 14 is a member for sandwiching the arrayed parts, it is usually constructed to be sufficiently thick, and therefore a large bonding area and a high bonding strength can be obtained. On the other hand, the thickness of the other part of the protective case 12 can be made thinner than before, so that the piezoelectric component can be downsized.

[0021]

Embodiments of the piezoelectric component according to the present invention will be described below with reference to the drawings. It should be noted that the same reference numerals are given to the components having the same functions as the conventional ones.

FIG. 2 is an exploded perspective view schematically showing the piezoelectric component according to the embodiment of the present invention. Piezoelectric resonators 10 and 2
A sheet of terminal plate 11 is arranged with the piezoelectric resonator 10 sandwiched therebetween, and the array component 19 in such a state is a protective case body 13, a protective case flat plate 14, and a lid 18. The case 12 is sealed and housed except for a part of the lead lead portion of the terminal board 11. In the protective case 13, the piezoelectric resonator 10 includes two terminal plates 11
The vibrating electrode 1 is fixed in a state of being sandwiched by the protruding portions 11a of the
The electrical contact between 0a and the terminal board 11 is maintained. In addition to the piezoelectric resonator 10 and the terminal plate 11, components such as a spring may be housed at the same time inside the protective case 12.

In this piezoelectric component, the protective case 12
Is the side surface 1 of the protective case plate 14 as shown in FIG.
4a and the inner side surface 13a of the protective case 13 are joined together to assemble.

Then, by applying an alternating current through the lead-out lead portion 11b of the terminal plate 11 of the piezoelectric component thus constructed, the piezoelectric resonator 10 sandwiched by the terminal plates 11 resonates and functions as a resonator or the like. It will be.

Since the piezoelectric component is constructed as described above, the array component 1 including the piezoelectric resonator 10 and the terminal plate 11 is formed.
When the clamping stress A by 9 acts on the protective case flat plate 14, it acts on the joint surface 14a as shear stress parallel to the joint surface 14a. Therefore, as in the conventional case, the joining surface 14
The protective case 12 is not easily disassembled because tensile stress does not act on a and does not peel off, and the joint surface 14a is less likely to be displaced, and the function as an oscillator or the like is stably maintained even when operated for a long time. Can be made.

Further, since the protective case flat plate 14 is a member for sandwiching the arrayed parts, it is usually formed to be sufficiently thick, and therefore, the bonding area can be made large and the bonding strength can be increased. Therefore, the piezoelectric component can be miniaturized by reducing the thickness of other portions of the protective case 12 while maintaining the bonding strength of the bonding surface of the protective case 12.

The method of assembling the piezoelectric component is the same as the conventional method except that the method of joining the protective case body 13 and the protective case flat plate 14 is slightly different. First,
The piezoelectric resonators 10 and the terminal plates 11 are arranged in the protective case body 13 in the arrangement order shown in FIG. 2, and are arranged in the protective case body 13. Then, the protective case flat plate 14 is fitted into the protective case body 13. , Side surface 1 of the protective case flat plate 14
4a and a part of the inner side surface 13a of the protective case body 14 are joined together. As a method of joining the joint surfaces, the joint surface 14a
Method for joining by vibrating ultrasonic waves with ultrasonic waves, joining surface 14a
It is possible to consider a method of heating and bonding the surfaces, a method of bonding the bonding surface 14a with an adhesive or the like.

Next, a piezoelectric component using a plurality of piezoelectric resonators 10 according to the present invention will be described.

FIG. 3 is a sectional view schematically showing a piezoelectric component in which four piezoelectric resonators 10 are used. Basically, a piezoelectric component in which one piezoelectric resonator 10 is used is constructed. Has not changed. Piezoelectric resonator 10, terminal plate 11, insulating plate 20
An array component 22 including a spring 21 and a spring 21 is arrayed as shown in FIG. 3, and a part of the terminal board 11 is exposed to the outside, and a protective case main body 13 ′, a protective case flat plate 14 ′, and a lid 18 ′.
It is sealed and housed in a protective case 12 '.
The piezoelectric component having such a configuration is mainly used as a filter or the like.

In this piezoelectric component, the protective case 1
Also in the configuration of 2 ', the side surface (not shown) of the protective case flat plate 14' is a part of the inner side surface of the protective case body 13 ', as in the case of the piezoelectric component using one piezoelectric resonator 10. It is joined with.

Therefore, the joint surface is not separated as in the case where a tensile stress is applied, the joint surface is less likely to be displaced, and the protective case 12 'is not disassembled even if it is operated for a long time and is stable. Thus, the function as a filter or the like can be retained.

Further, since the protective case flat plate 14 'is a member for sandwiching the arrayed parts, it is usually constructed to be sufficiently thick, and therefore a large bonding area and a high bonding strength are obtained. Therefore, the piezoelectric component can be downsized by reducing the thickness of the other part of the protective case 12 '.

[0033]

As described above in detail, in the piezoelectric component according to the present invention, the piezoelectric resonator, the terminal plate and the like are arranged and sandwiched in a protective case having an opening on one surface. In the piezoelectric component, a flat plate that constitutes at least one surface of a pair of facing surfaces of the protective case that sandwiches the array component including the piezoelectric resonator and the terminal plate is parallel to the sandwiching direction of the array component. Since the protective case is assembled by being joined to the other members of the protective case via the surface, the sandwiching stress of the arrayed component can be made to act as shear stress parallel to the joint surface, and therefore the joint surface It does not peel off, and displacement of the joint surface is relatively unlikely to occur. Therefore, the protective case is difficult to disassemble, the piezoelectric component can be stably operated over a long period of time, and the piezoelectric component having excellent durability can be provided.

Further, since the flat plate forming at least one of the pair of facing surfaces of the protective case that holds the arrayed parts is a member that holds the arrayed parts, it should be sufficiently thick. This is normal, and as a result, the bonding area can be increased and the bonding strength can be increased. Therefore, the piezoelectric component can be downsized by reducing the thickness of the other part of the protective case.

[Brief description of drawings]

FIG. 1 is a perspective view showing a protective case used for a piezoelectric component according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view schematically showing a piezoelectric component according to an example.

FIG. 3 is a sectional view schematically showing a piezoelectric component according to another embodiment.

FIG. 4A is an exploded perspective view showing a conventional piezoelectric component having one piezoelectric resonator, and FIG. 4B is a schematic sectional view thereof.

FIG. 5 is a perspective view showing a protective case used for a conventional piezoelectric component.

[Explanation of symbols]

 10 Piezoelectric Resonator 11 Terminal Plate 12, 12 'Protective Case 13, 13' Protective Case Main Body 14, 14 'Protective Case Flat Plate 19, 22 Arrangement Parts

Claims (1)

[Claims] 1. A piezoelectric component in which a piezoelectric resonator, a terminal plate, and the like are arranged and sandwiched in a protective case having an opening on one surface, and the piezoelectric resonator and the terminal plate are arranged components. The flat plate that constitutes at least one surface of the pair of opposing surfaces of the protective case that sandwiches the above-mentioned member is joined to another member of the protective case through a surface parallel to the sandwiching direction of the arrayed component. A piezoelectric component having a protective case assembled.