JPH0818383A - Piezoelectric component - Google Patents

Abstract

PURPOSE:To obtain the piezoelectric component which eliminates the need to bend lead terminals after assembly. CONSTITUTION:The piezoelectric component consists of a case 1, a lid member 5, piezoelectric resonators 6-9, an input terminal 10, a ground terminal 11, an output terminal 12, and a couple of repeating terminals 13 and 14. The input terminal 10, output terminal 12, and ground terminals 11 come into contact with an input electrode 15, an output electrode 16, and a ground electrode 17, which are provided extending from the internal wall surface of the storage part 2 of the case to the external surface of the case, and are electrically connected. The couple of repeating terminals 13 and 14 come into contact with a repeating internal conductor 18 provided on the internal wall surface of the storage part 2 of the case 1 and is electrically connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric component used when constructing an oscillation circuit, a filter circuit and the like.

[0002]

2. Description of the Related Art One type of piezoelectric component has a structure in which piezoelectric resonators and lead terminals are stacked and housed in a case having a substantially box shape. In this piezoelectric component, for example, the external connection portion of the input lead terminal and the output lead terminal is led out from one side of the case, and the external connection portion of the ground lead terminal is led out from the other side of the case. Conventionally, it has been difficult to assemble these lead terminals automatically after assembling them to a case, because it is necessary to bend the external connection portion into a predetermined shape. In addition, the bending process of the lead terminals has a problem that there is a large variation in the bending angle.

Therefore, an object of the present invention is to provide a piezoelectric component which does not require bending of the lead terminal after assembly.

[0004]

In order to solve the above problems, a piezoelectric component according to the present invention is inserted into (a) a substantially box-shaped case and (b) a housing portion of the case. A piezo-resonator, and (c) is inserted into the housing of the case,
An input internal terminal for holding the piezoelectric resonator, an output internal terminal, and a ground internal terminal; and (d) the input internal terminal, the output internal terminal, and the ground internal terminal from the inner wall surface of the case accommodating portion. It is characterized in that it is electrically connected to an input electrode, an output electrode and a ground electrode which are provided so as to extend on the outer surface of the case.

The piezoelectric component according to the present invention includes: (e) a substantially box-shaped case; (f) a piezoelectric resonator inserted into the housing of the case; and (g) housing of the case. An input internal terminal for holding the piezoelectric resonator, an output internal terminal, and a ground internal terminal; and (h) a lead portion of the input internal terminal, a lead portion of the output internal terminal, and the ground internal terminal. The wiring part is electrically connected to an input electrode, an output electrode, and a ground electrode, which are provided so as to extend from the opening end face of the case housing part to the outer surface of the case.

With the above structure, the input internal terminal, the output internal terminal, and the ground internal terminal are electrically connected to the input electrode, the output electrode, and the ground electrode, respectively, which are provided in advance in the case, and have a portion which is led out from the case. I don't. Therefore, it is not necessary to bend the lead terminal after assembling. Further, the piezoelectric component according to the present invention is characterized in that the pair of relay internal terminals are electrically connected to the relay internal conductor provided on the inner wall surface of the case housing portion. Since the pair of relay internal terminals are divided before being attached to the case, they are attached to the case in the same manner as other internal terminals and piezoelectric resonators. After being attached to the case, the relay internal terminals are electrically connected to each other via the relay internal conductor.

[0007]

Embodiments of the piezoelectric component according to the present invention will be described below with reference to the accompanying drawings. In each embodiment, a ladder type filter will be described as an example of the piezoelectric component. In the following embodiments, common parts and common parts are designated by the same reference numerals. [First Embodiment, FIGS. 1 to 3] As shown in FIGS. 1 and 2, the ladder type filter includes a case 1, a lid member 5, four piezoelectric resonators 6, 7, 8, 9 and an input inside. It is composed of a terminal 10, a ground internal terminal 11, an output internal terminal 12, and a pair of relay internal terminals 13 and 14. The piezoelectric resonators 6 to 9 are well-known ones having vibration electrodes on the front and back surfaces, respectively.

The case 1 is provided with an accommodating portion 2 having an opening on the upper surface, and one inner wall surface is formed with a concave portion 3a contacting the internal terminal 10 and a concave portion 3b contacting the internal terminal 12.
On the other inner wall surface, a recess 3c that contacts the internal terminal 11 and a recess 3d that contacts the internal terminals 13 and 14 are formed. An input electrode 15, an output electrode 16, a ground electrode 17, and a relay internal conductor 18 are formed on the respective surfaces of the concave portions 3a, 3b, 3c, 3d by means such as plating, vapor deposition or sputtering. Furthermore, the electrodes 15, 1
Reference numerals 6 and 17 extend from the top surface of the case 1 to the bottom surface around the side surfaces.

The input internal terminal 10 has a contact piece portion 10a and a connection portion 10b, and a protrusion provided on the contact piece portion 10a is in pressure contact with the upper surface of the piezoelectric resonator 6. The ground internal terminal 11 has a contact piece portion 11a and a contact piece portion 11b that are folded and doubly overlapped with each other. One piece 11b
The protrusion provided on the bottom surface is in pressure contact with the lower surface of the piezoelectric resonator 7.

The output internal terminal 12 is formed by bending the contact piece portion 12a and superimposing the contact piece portion 12a on the contact piece portion 12b.
and the protrusion provided on the contact piece portion 12a has a piezoelectric resonator 8c.
Is pressed against the lower surface of the piezoelectric resonator 9 and the protrusion provided on the contact piece portion 12b is pressed against the upper surface of the piezoelectric resonator 9. The relay internal terminal 13 is formed by bending the contact piece 13a and overlapping the contact piece 1a.
The protrusion provided on the contact piece portion 13a has pressure contact with the upper surface of the piezoelectric resonator 7, and the protrusion provided on the contact piece portion 13b has pressure contact with the lower surface of the piezoelectric resonator 6. The connecting portion 13c extends from the corner of the contact piece portion 13a.

The relay internal terminal 13 and the relay internal terminal 14 paired with the relay internal terminal 13.
Has a contact piece portion 14a and a connection portion 14b, and the contact piece portion 1
The protrusion provided on 4a is in pressure contact with the lower surface of the piezoelectric resonator 9. The connecting portion 14b extends from the corner of the contact piece portion 14a. These piezoelectric resonators 6 to 9 and internal terminals 10 to 14
Are sequentially inserted into the housing portion 2 of the case 1 and stacked. At this time, the connecting portion 10b of the internal terminal 10 has the concave portion 3a.
And is electrically connected to the input electrode 15. Similarly, the connection portion 11c of the internal terminal 11 is fitted into the recess 3c and electrically connected to the ground electrode 17. The connecting portion 12c of the internal terminal 12 is fitted into the recess 3b, and the output electrode 1
6 electrically connected. The connecting portions 13c and 14b of the internal terminals 13 and 14 are fitted into the recess 3d, and the relay internal conductor 1
8 electrically connected. Therefore, the internal terminals 10-12
Does not have a portion leading out from the case 1, so that the bending process of the lead terminal after assembling is unnecessary.

Since the pair of relay internal terminals 13 and 14 are independent of each other, they are stacked in the same manner as the other internal terminals 10 to 12 and the piezoelectric resonators 6 to 9. Therefore, the assembly procedure can be simplified, and automation can be promoted. On the other hand, the relay internal terminals 13 after being stacked,
Since 14 is electrically connected via the relay inner conductor 18, it can have the same function as a U-shaped relay terminal. Next, the opening end surface of the housing portion 2 of the case 1 is closed with the lid member 5. As a result, a surface mount type ladder filter is obtained.

FIG. 3 is an electrical equivalent circuit diagram of the obtained ladder type filter. Piezoelectric resonators 6 and 9 are connected in series between the input electrode 15 and the output electrode 16,
The piezoelectric resonators 7 and 8 are connected in parallel between the output electrode 16 and the output electrode 16.

[Second Embodiment, FIGS. 4 and 5] As shown in FIGS. 4 and 5, the ladder type filter includes a case 31, a lid member 35, and four piezoelectric resonators 6, 7, 8, 9; It is composed of an input internal terminal 40, a ground internal terminal 41, an output internal terminal 42 and a pair of relay internal terminals 43 and 44. The piezoelectric resonators 6 to 9 are the same as those used in the first embodiment.

The case 31 is a housing portion 3 having an opening on the upper surface.
2, the inner terminal 40 and the inner terminal 4 are provided on one side wall portion.
The concave portion 33a and the concave portion 33b that come into contact with 2 are formed, and the concave portion 33c that comes into contact with the internal terminal 11 and the concave portion 33d for avoiding the internal terminals 13 and 14 are formed on the other side wall portion. The recesses 33a, 33b and 33c are the case 31.
Is formed to extend to the upper surface of. Then, the input electrode 45, the output electrode 46, and the ground electrode 47 are formed around the side surface from the upper surface to the bottom surface of the case 31 by means such as plating, vapor deposition, or sputtering. That is, unlike the first embodiment, no electrode is formed on the inner wall surface of the housing portion 32.

The input internal terminal 40 has a contact piece portion 40a and a lead-out portion 40b, and a protrusion provided on the contact piece portion 40a is in pressure contact with the upper surface of the piezoelectric resonator 6. Ground internal terminal 41
Has a contact piece portion 41b and a lead-out portion 41c which are bent and overlapped with the contact piece portion 41a.
The protrusion provided on 1b is in pressure contact with the lower surface of the piezoelectric resonator 7.

The output internal terminal 42 is formed by bending the contact piece portion 42a and overlapping the contact piece portion 42b with the contact piece portion 42b.
2c, the protrusion provided on the contact piece portion 42a is in pressure contact with the lower surface of the piezoelectric resonator 8, and the protrusion provided on the contact piece portion 42b is in contact with the upper surface of the piezoelectric resonator 9. The relay internal terminal 43 has a contact piece portion 43a and a contact piece portion 43b, which is bent and overlapped with the contact piece portion 43a, and a relay piece portion 43c. Contact piece 43b
The protrusion provided on the bottom surface is in pressure contact with the lower surface of the piezoelectric resonator 6. The relay piece 43c extends substantially vertically from the corner of the contact piece 43a.

Relay internal terminal 43 paired with relay internal terminal 43
Has a contact piece portion 44 a and a relay piece portion 44 b, and a protrusion provided on the contact piece portion 44 a is in pressure contact with the lower surface of the piezoelectric resonator 9. The relay piece 44 extends substantially vertically upward from the corner of the contact piece 44a. The piezoelectric resonators 6 to 9 and the terminals 40 to 44 are sequentially inserted into the housing portion 32 of the case 31,
Stacked. At this time, the routing portion 4 of the internal terminal 40
The tip portion of 0b is electrically connected to the end portion of the input electrode 45 on the upper surface of the case 31 by solder or conductive paste. Similarly, the leading end of the lead-out portion 41c of the internal terminal 41 is electrically connected to the end of the ground electrode 47 on the upper surface of the case 31 by soldering or conductive paste. The leading end of the lead-out portion 42c of the internal terminal 42 is electrically connected to the end of the output electrode 46 on the upper surface of the case 31 with solder or conductive paste. Therefore, the internal terminals 40 to 42 do not have a portion leading out from the case 31, and bending work of the lead terminal after assembly is unnecessary.

Since the pair of relay internal terminals 43 and 44 are independent of each other, they are stacked in the same manner as the other internal terminals 40 to 42 and the piezoelectric resonators 6 to 9. Therefore, the assembly procedure can be simplified, and automation can be promoted. On the other hand, the relay internal terminals 43 after being stacked,
The relay piece 44 is integrally formed by press-contacting the relay piece portions 43c and 44b. That is, the integrated relay terminal 4
3, 44 can have the same function as the U-shaped relay terminal. Next, by closing the open end surface of the housing portion 32 of the case 31 with the lid member 35, a surface mounting type ladder type filter is obtained.

[Other Embodiments] The piezoelectric component according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the invention. Further, the piezoelectric component is not limited to the ladder type filter, but may be an oscillator, an LC filter or the like.

[0021]

As is apparent from the above description, according to the present invention, the input internal terminal, the output internal terminal and the ground internal terminal are electrically connected to the input electrode, the output electrode and the ground electrode, respectively, which are provided in advance in the case. Since it is electrically connected, it does not have a portion derived from the case. Therefore, it is possible to obtain a piezoelectric component that does not require bending of the lead terminal after assembly.

Since the pair of relay internal terminals are divided before being attached to the case, they are attached to the case in the same manner as other internal terminals and piezoelectric resonators. After being attached to the case, since the relay internal terminals are electrically connected to each other and integrated, they have the same function as the U-shaped relay terminal. As a result, the piezoelectric component has a structure in which the piezoelectric resonator and the internal terminal can be easily assembled in the case, and can be easily adapted to automatic assembly.

[Brief description of drawings]

FIG. 1 is an assembled perspective view showing a first embodiment of a piezoelectric component according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an electrical equivalent circuit diagram of the piezoelectric component shown in FIG.

FIG. 4 is an assembled perspective view showing a second embodiment of the piezoelectric component according to the present invention.

5 is a sectional view taken along line VV of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 2 ... Housing part 6, 7, 8, 9 ... Piezoelectric resonator 10 ... Input internal terminal 11 ... Ground internal terminal 12 ... Output internal terminal 13, 14 ... Relay internal terminal 15 ... Input electrode 16 ... Output electrode 17 ... Ground electrode 18 ... Relay inner conductor 31 ... Case 32 ... Housing 40 ... Input internal terminal 40b ... Routing section 41 ... Ground internal terminal 41c ... Routing section 42 ... Output internal terminal 42c ... Routing section 45 ... Input electrode 46 ... Output electrode 47 ... Ground electrode

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Hosoe 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Masaaki Tsuchiya 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Murata Manufacturing (72) Inventor Hirohide Yoshino 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Murata Manufacturing Co., Ltd. (72) Mana Sumida 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Murata Manufacturing Co., Ltd. (72) Inventor Takeshi Yamazaki 2-10-10 Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Inventor Shigeo Ojima 2-26-10 Tenjin, Nagaokakyo City, Kyoto Murata Manufacturing Co., Ltd. (72) Invention Sadayuki Kato, 2-10-10, Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. A case having a substantially box shape, a piezoelectric resonator inserted in a housing portion of the case, an input internal terminal and an output internal terminal inserted in the housing portion of the case and holding the piezoelectric resonator. An input electrode, an output electrode provided by extending the input internal terminal, the output internal terminal, and the ground internal terminal from the inner wall surface of the case accommodating portion to the outer surface of the case, A piezoelectric component characterized in that it is electrically connected to each ground electrode. 2. A case having a substantially box shape, a piezoelectric resonator inserted into a housing portion of the case, an input internal terminal and an output internal terminal inserted into the housing portion of the case and holding the piezoelectric resonator. And a ground internal terminal, and a pair of relay internal terminals inserted into the housing portion of the case and holding the piezoelectric resonator, wherein the input internal terminal, the output internal terminal, and the ground internal terminal are housed in the case. Electrically connected to an input electrode, an output electrode, and a ground electrode that extend from the inner wall surface of the case to the outer surface of the case, and the pair of relay internal terminals are provided on the inner wall surface of the case housing section. A piezoelectric component characterized in that it is electrically connected to the relay internal conductor. 3. A case having a substantially box shape, a piezoelectric resonator inserted in a housing portion of the case, an input internal terminal and an output internal terminal inserted in the housing portion of the case and holding the piezoelectric resonator. And a ground internal terminal, and the routing portion of the input internal terminal, the routing portion of the output internal terminal, and the routing portion of the ground internal terminal extend from the opening end surface of the case accommodating portion to the case outer surface. A piezoelectric component characterized in that it is electrically connected to an input electrode, an output electrode, and a ground electrode, which are provided at existing locations.