JPH0753301Y2 - Piezoelectric parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a leadless type piezoelectric component used for a ceramic resonator or the like.

<Prior Art> FIG. 4 is an exploded perspective view of a conventional piezoelectric component, FIG. 5 is a front partial sectional view of the same in an assembled state, and FIG. 6 is a side view of the same. In the figure, 1 is a piezoelectric vibrator, 2 is a piezoelectric vibrator 1
An insulating substrate 3 for supporting the is a case. Piezoelectric vibrator 1
Has oscillating electrodes 102 and 103 led out in mutually opposite directions on both sides in the plate thickness direction of a rectangular flat plate-shaped piezoelectric element 101. Ten
Reference numerals 4 and 105 are dummy electrodes.

Extraction electrodes 21 and 22 are formed on the surface of the insulating substrate 2 so as to be continuous from one surface to both end surfaces of the insulation substrate 2 at intervals, and the vibration electrode 102 is formed on the extraction electrodes 21 and 22. The piezoelectric vibrator 1 is arranged so that the end portion and the dummy electrode 104 are placed.
It is equipped with. Then, the extraction electrode 2 from the dummy electrode 105
The conductive bonding member 4 is attached to the area 1 and the conductive bonding member 5 is attached to the extraction electrode 22 from the vibrating electrode 103. As a result, the vibrating electrode 102 is conductively connected to the extraction electrode 21, and the vibrating electrode 103 is conductively connected to the extraction electrode 22.

The case 3 is made of an insulating material and is mounted on the surface of the insulating substrate 2 so as to cover the piezoelectric vibrator 1 in an airtight manner.
When mounting the insulating substrate 2 and the case 3, means such as bonding is used.

When mounting on the circuit board, the insulating substrate 2 side is placed on the circuit board as shown in FIG. 7 and FIG.
Of the parts 1 and 22, the parts 211 and 221 formed by extending to the side end surface of the insulating substrate 2 are soldered 6 and 7 to the conductor patterns 81 and 82 on the circuit board 8.

<Problems to be Solved by the Invention> However, the above-described conventional piezoelectric component has the following problems.

(A) Conductor pattern 81 when mounted on the circuit board 8,
The parts 211 and 221 of the extraction electrodes 21 and 22 soldered to 82 are
It is formed on the side end surface of the insulating substrate 2 which is biased downward.
Therefore, when mounting on a circuit board, it is necessary to confirm the vertical directionality so that the insulating substrate 2 is on the lower side. Such direction confirmation can be relatively easily performed by human eyes, but it is not easy in the case of automatic mounting, which is an obstacle to automatic mounting.

(B) For mounting on a circuit board, of the extraction electrodes 21, 22, portions 211, 2 formed by extending to the side end surface of the insulating substrate 2.
Since 21 is soldered 6 and 7 to the conductor patterns 81 and 82 on the circuit board 8, in order to secure the soldering allowance, as shown in FIGS. Is required to be larger than Case 3, which is an obstacle to miniaturization.

(C) As the size of the insulating substrate 2 is reduced to reduce the size, the soldering allowance becomes smaller and the soldering strength cannot be maintained.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the piezoelectric component according to the present invention has extraction electrodes formed continuously on one surface and side end surfaces in the thickness direction at opposite ends. An insulating substrate having
A piezoelectric vibrator in which vibrating electrodes mounted on the one surface of the insulating substrate and provided on both surfaces in the plate thickness direction are conductively connected to the respective extraction electrodes, and attached to the insulating substrate so as to cover the piezoelectric vibrator. And a case having a conductive portion electrically connected to the extraction electrode on its outer surface. The insulating substrate is fitted to the case, the fitting portion of the case is formed with another conductive portion that is conductive with the conductive portion of the case, via the other conductive portion, The extraction electrode provided on the insulating substrate is electrically connected to the conductive portion of the case.

<Operation> In the piezoelectric component according to the present invention, the insulating substrate on which the piezoelectric component is mounted has extraction electrodes continuously formed on one surface and side end surfaces in the thickness direction at opposite ends, and the piezoelectric vibrator is provided. Since a conductive part that is electrically connected to the extraction electrode is provided on the outer surface of the case attached to the insulating substrate so as to cover Even on the side, it can be mounted in any state. For this reason, when mounting the piezoelectric component on a circuit board or the like and soldering it, it is not necessary to check the vertical direction, so that automatic mounting is facilitated.

Further, since the outer surface of the case has the conductive portion that is electrically connected to the extraction electrode, when mounting on the circuit board, the conductive portion of the case can be soldered to the conductor pattern to secure a large soldering area. Moreover, even if the case has substantially the same plane area as the insulating substrate, a large soldering area can be secured by the conductive portion of the case, so that a small-sized piezoelectric component that can be easily soldered can be obtained.

Furthermore, the insulating substrate is fitted inside the case, and another conductive portion that is conductive with the conductive portion of the case is formed on the inner surface of the case that is the fitting portion, and through the other conductive portion, Since the extraction electrode provided on the insulating substrate is electrically connected to the conductive portion of the case, the case and the insulating substrate are reliably positioned and combined, and the conductive portion of the case and the extraction electrode provided on the insulating substrate are It is possible to ensure electrical conduction by fitting, and to make the overall shape smaller and thinner.

<Embodiment> FIG. 1 is an exploded perspective view of a piezoelectric component according to the present invention, and FIG. 2 is a partial sectional view of the same in an assembled state. 4 and 5
Reference numerals that are the same as those in the drawings indicate components that are the same. The insulating substrate 2 has extraction electrodes 21 and 22 continuously formed on one surface and side end surfaces in the thickness direction at both end portions facing each other. The piezoelectric vibrator 1 includes the vibrating electrodes 102 and 103 for extracting the vibrating electrodes 102 and 103 by the conductive bonding members 4 and 5 such as a conductive paste.
Conductive connection is made to each of 1 and 22.

The case 3 is made of an insulating material such as plastic or ceramic and has a side end surface 23 on which the extraction electrodes 21 and 22 of the insulating substrate 2 are formed.
The outer surface 31, 32 corresponding to 24 is provided with conductive parts 9, 10 by metallization or the like, and the conductive parts 9, 10 and the extraction electrodes 21, 22 provided on the insulating substrate 2 are soldered or conductive. It is fixed by conductive bonding members 11 and 12 such as a conductive paste.

With the above-described structure, the insulating substrate 2 and the case 3 are attached to the side surfaces 23-31 and 24-32 of the opposite ends of the insulating substrate 2.
To the case 3, a conductive portion is formed by the extraction electrode 21-conductive portion 9, the extraction electrode 22-conductive portion 10 and the conductive joining members 11 and 12. Therefore, there is no vertical directionality,
When mounted on the circuit board 8, as shown in FIG. 3, even if the insulating board 2 is placed on the lower side, it is upside down.
The conductor patterns 81 and 82 can be soldered 6 and 7 in any state with the case 3 side facing down. Therefore, it is not necessary to confirm the vertical direction when mounting and soldering on the circuit board 8, which facilitates automatic mounting.

Moreover, since a large soldering area can be secured by the conductive portions 9 and 10 of the case 3, sufficient soldering strength can be secured and the soldering work becomes easy. In addition, even if the case 3 has substantially the same plane area as the insulating substrate 2,
Since a large soldering area can be secured by the conductive parts 9 and 10 of the case 3, a small-sized and easy-to-solder piezoelectric component can be obtained.

The insulating substrate 2 is fitted in the opening of the case 3. Conductive parts 13 and 14 that are electrically connected to the conductive parts 9 and 10 are formed on the inner surface of the case 3 that constitutes the fitting part.
The extraction electrodes 21 and 22 are electrically connected to the conductive portions 9 and 10 via the. With this structure, the case 3 and the insulating substrate 2 are reliably positioned and combined, and the conductive portion (9, 1
0), (13, 14) and the extraction electrode 2 provided on the insulating substrate 2
It is possible to make sure that 1 and 22 are electrically connected to each other by fitting, and to make the entire shape small and thin.

<Effect of the Invention> As described above, according to the present invention, the following effects can be obtained.

(A) It is possible to provide a piezoelectric component which can cope with automatic mounting by eliminating the vertical directionality.

(B) Since a large soldering area can be secured by the conductive portion of the case, it is possible to provide a piezoelectric component that has a large soldering strength when mounted on a circuit board or the like and is easy to solder.

(C) The case and the insulating substrate are surely positioned and combined with each other, the conductive portion of the case and the extraction electrode provided on the insulating substrate are surely brought into conduction by fitting, and the overall shape is made smaller and thinner. A piezoelectric component can be provided.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a piezoelectric component according to the present invention, FIG. 2 is a front sectional view in the same assembled state, and FIG. 3 is a sectional view showing a state where the piezoelectric component according to the present invention is mounted on a circuit board, Fourth
FIG. 6 is an exploded perspective view of a conventional piezoelectric component, FIG. 5 is a partial sectional view of the same in an assembled state, FIG. 6 is a side view of the same, and FIG.
8A and 8B are partial cross-sectional views showing a mounting state on the circuit board. 1 ... Piezoelectric vibrator, 102, 103 ... Vibration electrode 2 ... Insulating substrate, 21, 22 ... Extraction electrode 3 ... Case, 31, 32 ... Outer surface 9, 10 ... Conductive part

 ─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-51-121283 (JP, A) JP-A-57-118419 (JP, A) JP-A-55-13553 (JP, A) Actual development Sho-57- 39128 (JP, U) Actually open 59-137633 (JP, U) Actually public 58-7672 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. An insulating substrate having extraction electrodes continuously formed on one surface and side end surfaces in the thickness direction at opposite ends, and on both surfaces in the plate thickness direction mounted on the one surface of the insulating substrate. A piezoelectric vibrator in which vibrating electrodes are conductively connected to each of the extraction electrodes; and a case having a conductive portion attached to the insulating substrate so as to cover the piezoelectric vibrator and having an outer surface in conduction with the extraction electrodes. A piezoelectric component comprising: the case, wherein the insulating substrate is fitted inside the case, and another conductive portion that is conductive with the conductive portion of the case is formed on an inner surface of the case that serves as a fitting portion. And
A piezoelectric component, wherein the extraction electrode provided on the insulating substrate is electrically connected to the conductive portion of the case via the other conductive portion.