JPH07142955A - Terminal for piezoelectric parts - Google Patents

Abstract

PURPOSE:To obtain a terminal for piezoelectric parts, which is immune to output waveform variation caused by impact, vibration, etc., from outside. CONSTITUTION:The terminal 11 is bent and overlapped doubly. An electrode terminal part 11a consists of a unbent part 111 and a bent part 112. At each opposite surface where the unbent part 111 confronts the bent part 112, a knurling is made so as to provide knurls 113 and 114. A vibration dissipating material 120 is disposed in a gap formed by the knurls 113 and 114. Press oil, the nonvolatile component of press oil, silicon grease, rust-proof agents, coating agents, silicon rubber, etc., are used as the vibration dissipating material 120.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal which is a component of a piezoelectric component, and more particularly to a piezoelectric component terminal which has an electrode piece portion which is bent and is double overlapped.

[0002]

BACKGROUND OF THE INVENTION Conventionally, as a terminal used for a piezoelectric component, an electrode piece portion is bent and superposed in a double manner, and a projection is provided on each of the non-folded portion and the bent portion. It has been known. When external impact or vibration is applied to a piezoelectric component that is housed in a substantially box-shaped case in which such bent double-sided protruding terminals and piezoelectric resonators are stacked, there is a problem that the output waveform is likely to fluctuate. there were. It is considered that the output waveform fluctuates because a plurality of parasitic vibration modes are generated by an external impact or the like, and the plurality of parasitic vibration modes are transmitted along with the normal vibration mode through the terminal.

Therefore, an object of the present invention is to provide a piezoelectric component terminal capable of reducing the fluctuation of the output waveform caused by an external impact or vibration.

[0004]

In order to solve the above-mentioned problems, the piezoelectric component terminal according to the present invention comprises: (a) an electrode piece part which is bent and superposed in a double manner; A projection provided on a bent portion of the piece and a projection provided on a non-folded portion; and an external connection portion connected to the electrode piece, (b) a bent portion of the electrode piece and a non-folded portion. A concavo-convex portion is provided on at least one of the facing surfaces facing each other, and a vibration absorbing material is disposed between the bent portion and the non-folded portion. . Here, as the vibration absorbing material, press oil,
Non-volatile components of press oil, silicone grease, rust preventive agent, coating agent, silicone rubber, etc. are used.

In the above structure, the vibration absorbing material disposed between the bent portion and the non-bending portion easily accumulates in the gap formed in the uneven portion, and the vibration absorbing material bends the electrode piece portion. It tends to remain between the portion and the non-folded portion. Then, the piezoelectric component provided with this terminal becomes difficult to output the parasitic vibration mode, and mainly outputs the normal vibration mode. It is considered that this is because the vibration absorbing material absorbs the parasitic vibration mode transmitted from the piezoelectric resonator to the terminal and hardly absorbs the normal vibration. Therefore, the fluctuation of the output waveform is suppressed as compared with the conventional piezoelectric component having the terminal.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a piezoelectric component terminal according to the present invention will be described below with reference to the accompanying drawings. [First Embodiment, FIGS. 1 to 5] As shown in FIGS. 1 and 2, the terminal 11 includes an electrode piece portion 11a, an external connection portion 11b, and projections 11c and 11d. This terminal 11 is, for example, after being cut out from a metal material by a press cut method,
It is manufactured by bending. Electrode piece 11a
Consists of an unfolded portion 111 and a folded portion 112,
It has a structure that is folded and doubled.
Knurling is performed on the respective facing surfaces of the non-bent portion 111 and the bent portion 112, and knurls 113 and 114 are provided. The step size is 10μ when the material thickness of the terminal 11 is 150μm.
It is preferably set to m or less.

Further, as shown in FIG. 3, a vibration absorber 120 is arranged between the non-bent portion 111 and the bent portion 112. This vibration absorbing material 120 has the notches 11
It is easy to collect in the gap formed by 3 and 114, and the unfolded portion 1
It is easy to remain between 11 and the bent portion 112. Therefore, the amount of vibration absorber remaining between the non-folded portion and the bent portion is large compared to the case where the knurled portions are not provided on the opposing surfaces of the non-folded portion and the bent portion, and the The fluctuation of the output waveform can be reduced. Vibration absorber 1
As 20, a press oil, a non-volatile component of the press oil, silicon grease, a rust preventive agent, a coating agent, a silicone rubber or the like is used.

In the terminal 11 having the above structure, the vibration absorbing material 120 is provided between the non-bent portion 111 and the bent portion 112.
Since the piezoelectric component provided with this terminal 11 is difficult to output a plurality of parasitic vibration modes generated by external impact or vibration, the piezoelectric component mainly outputs the normal vibration mode. . Therefore, the fluctuation of the output waveform can be reduced as compared with the conventional piezoelectric component having a terminal.

Next, the function and effect of the terminal 11 will be described by taking a ladder type filter using this terminal 11 as an output terminal as an example. The terminal 11 may be used as an input terminal, a ground terminal, a relay terminal, or the like, or the terminal 11 may be used as two or more terminals. However, it is most effective to use it as an output terminal. As shown in FIG. 4, the ladder-type filter has substantially box-shaped cases 1 and 4.
Piezoelectric resonators 5, 6, 7, 8 of sheets, input terminal 10, terminal 1
1, relay terminal 12, ground terminal 13, and spring terminal 20
It is composed of. The piezoelectric resonators 5, 6, 7, and 8 are well-known ones in which vibration electrodes are provided on the front and back surfaces, respectively, and vibrate in a spreading vibration mode.

The case 1 has an opening 1a on the right side and is made of resin, ceramics or the like.
In the terminal 11 functioning as an output terminal, the protrusion 11c is in pressure contact with the lower surface of the piezoelectric resonator 8 and the protrusion 11d is in pressure contact with the upper surface of the piezoelectric resonator 7. The input terminal 10 includes an electrode piece portion 10a, an external connection portion 10b, and a protrusion 10c, and the protrusion 10c is in pressure contact with the lower surface of the piezoelectric resonator 5.

The relay electrode 12 includes electrode piece portions 12a and 12b, a relay piece portion 12c, and projections 12d, 12e and 12f,
The projection 12d is pressed against the upper surface of the piezoelectric resonator 8 and the projection 12e
Is pressed against the lower surface of the piezoelectric resonator 6, and the protrusion 12f is pressed against the upper surface of the piezoelectric resonator 5. The electrode piece portion 12b has a structure in which the electrode piece portion 12b is bent and superposed in double, and includes an unfolded portion 121 and a folded portion 122. Knurling is performed on each of the facing surfaces where the non-bent portion 121 and the bent portion 122 face each other, and knurls are provided. The electrode piece 12b has a non-bent portion 1
A vibration absorbing material is arranged between 21 and the bent portion 122.

The ground terminal 13 includes an electrode piece portion 13a, an external connection portion 13b, and protrusions 13c and 13d.
Is pressed against the lower surface of the piezoelectric resonator 7, and the protrusion 13d is pressed against the upper surface of the piezoelectric resonator 6. The electrode piece portion 13a has a structure in which the electrode piece portion 13a is bent and superposed in a doubled manner, and includes an unfolded portion 131 and a folded portion 132. Knurling is performed on each of the facing surfaces where the non-bent portion 131 and the bent portion 132 face each other, and knurling is provided. The unfolded portion 13 is formed on the electrode piece portion 13a.
A vibration absorbing material is arranged in the gap between the bent portion 132 and the bent portion 132.

The above piezoelectric resonators 5-8 and terminals 10-1
The case 3 is housed in the case 1. The spring terminal 20 is sandwiched between the case 1 and the terminal 10 so as to generate an appropriate pressure contact force between the piezoelectric resonators 5-8 and the terminals 10-13. Insulating paper 30 is set on the stepped portion of the opening 1 a of the case 1. A sealing material 31 such as resin is potted in the opening 1a of the case 1 to seal the inside of the case 1. The external connection portions 10b, 11b, 13b of the terminals 10, 11, 13 are formed after the sealing material 31 is cured.
It may be bent along the side surface and the bottom surface of the case 1 and may be a surface mount type.

FIG. 5 is an electrical equivalent circuit diagram of the ladder type filter thus obtained. Piezoelectric resonators 5 and 8 connected in series between input terminals 10 and 11 and piezoelectric resonators 6 and 7 connected in parallel are alternately connected to form a ladder structure. Since the vibration absorbing material 120 is arranged between the non-bent portion and the bent portion of the terminals 11 to 13, it is difficult to output a plurality of parasitic vibration modes generated due to external impacts or vibrations. The vibration mode of is mainly output from the terminal 11. Therefore, it is possible to obtain a ladder type filter in which the fluctuation of the output waveform is smaller than that of the conventional ladder type filter having a terminal.

[Second and Third Embodiments, FIGS. 6 to 8] As shown in FIG. 6, the terminal 51 of the second embodiment includes an electrode piece portion 51a, an external connecting portion 51b, and protrusions 51c and 51d. I have it. By bending the bent portion 152 and superposing it on the non-folded portion 151, the electrode piece portion 51a is formed.
Is formed. Unfolded portion 151 and folded portion 152
On each of the facing surfaces facing each other,
A large number of 3,154 are provided. Unfolded portion 151
A vibration absorbing material is disposed between the bent portion 152 and the bent portion 152.
This vibration absorbing material easily accumulates in the gap formed by the semi-spherical recesses 153 and 154, and easily remains between the non-bent portion 151 and the bent portion 152.

In the terminal 51 having the above structure, the vibration absorbing material is arranged between the non-bent portion 151 and the bent portion 152. Therefore, the piezoelectric component provided with the terminal 51 has a shock from the outside. It becomes difficult to output a plurality of parasitic vibration modes generated due to vibrations and the like, and the normal vibration mode is mainly output. Therefore, the fluctuation of the output waveform can be reduced as compared with the conventional piezoelectric component having a terminal.

Further, as shown in FIGS. 7 and 8, the terminal 61 of the third embodiment is provided with an electrode piece portion 61a, an external connection portion 61b, and protrusions 61c and 61d. The electrode piece 61a is
It is composed of a non-bent portion 161 and a bent portion 162, and has a structure in which it is folded and doubled. Grooves 163 and 164 are provided on the respective facing surfaces of the non-bent portion 161 and the bent portion 162. A vibration absorber 170 is arranged between the non-bent portion 161 and the bent portion 162. The vibration absorbing material 170 is likely to accumulate in the gap formed by the grooves 163 and 164, and is likely to remain between the non-bent portion 161 and the bent portion 162.

In the terminal 61 having the above structure, the vibration absorbing material 170 is provided between the non-bent portion 161 and the bent portion 162.
Since the piezoelectric component provided with this terminal 61 is difficult to output a plurality of parasitic vibration modes generated by external impact or vibration, the piezoelectric component mainly outputs the normal vibration mode. . Therefore, the fluctuation of the output waveform can be reduced as compared with the conventional piezoelectric component having a terminal.

[Other Embodiments] The piezoelectric component terminal according to the present invention is not limited to the above-mentioned embodiment, but can be variously modified within the scope of the gist thereof. In the above-described embodiment, the vibration absorbing material is provided on all the bent double-sided protruding terminals, but it is not always necessary to provide the vibration absorbing material on all the double-sided protruding terminals. Further, the concave-convex shape portions formed on the respective facing surfaces where the non-bent portion and the bent portion of the electrode piece portion face each other are not limited to the shapes of the above-described embodiments. For example, either one of the grooves of the third embodiment may be formed in a protrusion shape instead of the groove shape.

[0020]

As is apparent from the above description, according to the present invention, the concavo-convex portion is formed on at least one of the facing surfaces of the bent and unfolded portions of the electrode piece. Since it is provided, the vibration absorber disposed between the bent portion and the non-folded portion easily accumulates in the gap formed in the uneven portion, and the vibration absorber does not bend with the bent portion of the electrode piece. It tends to remain between the bent parts. Therefore, the amount of the vibration absorber remaining between the non-bent portion and the bent portion can be increased as compared with the case where the uneven portion is not provided on the opposing surface of the non-bent portion and the bent portion. . Then, the piezoelectric component provided with this terminal is less likely to output a plurality of parasitic vibration modes generated by external impacts or vibrations, and can reduce variations in the output waveform due to external impacts or vibrations.

[Brief description of drawings]

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

FIG. 2 is a perspective view of the piezoelectric component terminal shown in FIG. 1 after bending.

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is a partial cross-sectional view of a ladder type filter including the piezoelectric component terminal shown in FIG.

5 is an electrical equivalent circuit diagram of the ladder filter shown in FIG.

FIG. 6 is a perspective view showing a second embodiment of the piezoelectric component terminal according to the present invention.

FIG. 7 is a perspective view showing a third embodiment of the piezoelectric component terminal according to the present invention.

8 is a sectional view of the piezoelectric component terminal shown in FIG. 7 after bending.

[Explanation of symbols]

 11 ... Terminal 11a ... Electrode piece 11b ... External connection part 11c, 11d ... Protrusion 111 ... Non-bending part 112 ... Bending part 113,114 ... Indentation 120 ... Vibration absorber 51 ... Terminal 51a ... Electrode piece 51b ... External connection parts 51c, 51d ... Protrusions 151 ... Non-bending parts 152 ... Bending parts 153, 154 ... Semi-spherical recesses 61 ... Terminals 61a ... Electrode piece parts 61b ... External connecting parts 61c, 61d ... Protrusions 161 ... Non-bending Part 162 ... Bent part 163, 164 ... Groove 170 ... Vibration absorber

Claims (1)

[Claims] 1. An electrode piece part that is bent and superposed in a double manner, a protrusion provided on a bent part of the electrode piece part and a protrusion provided on a non-bent part, and connected to the electrode piece part. And a concave-convex portion is provided on at least one of the facing surfaces of the facing portion and the non-folding portion of the electrode piece portion that are opposed to each other. A piezoelectric component terminal, characterized in that a vibration absorbing material is disposed between the bent portions.