JPH0574963B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Fields of Use The present invention is particularly applicable to chip-type piezoelectric resonators, which are mainly applied to LSI and microcomputer application fields, such as reference signal generation oscillators, television receivers, video tape recorders, etc. This invention relates to traps and discriminators for SIF band signal processing in the field of video equipment.

Conventional Structure and its Problems Conventionally, a piezoelectric resonator used for this type of application has been structured as shown in FIGS. 1 to 3. That is, as shown in FIG. 1, electrodes 2a and 2b are provided on opposing surfaces a and b of a rectangular piezoelectric element 1 from one end to the other end, respectively, and
Margin portions 3a and 3b where the electrodes 2a and 2b are not provided are formed in b.

As shown in FIG. 2, this piezoelectric element 1 is placed on a printed circuit board 5 with conductive parts 4a and 4b formed at both ends, and fixed with solder or conductive adhesive 6a and 6b to connect the electrode 2a and the conductive parts. 4a, the electrode 2b and the conductive portion 4b are electrically connected. In addition, 7a,
7b is a lead wire connected to the conductive portions 4a, 4b by soldering or the like.

As shown in FIG. 3, the assembly assembled as shown in FIG. 2 is protected entirely up to the base of the lead wires 7a and 7b.

However, this structure has the disadvantage that the shape of the components becomes large due to the exterior packaging, and it has been difficult to increase the packaging density of the circuit. Furthermore, because of the presence of lead wires 7a and 7b, it is currently not suitable for automatic insertion.

Purpose of the Invention The present invention provides a chip-type piezoelectric resonator that eliminates conventional lead wires, allows it to be handled in the same way as other chip parts by an automatic insertion machine, and also provides high reliability and increases packaging density. The purpose is to provide children.

Structure of the Invention The chip-shaped piezoelectric resonator of the present invention includes a rectangular piezoelectric element, a cylindrical body in which grooves are formed along the longitudinal direction at opposing positions on the inner peripheral surface, and a cylindrical body that is symmetrical along the inside. a cylindrical body provided with a plurality of convex portions at positions;
A conductive cap attached to both ends of the cylindrical body is provided, and a rectangular piezoelectric element is inserted into the inside of the cylindrical body, and the position of the rectangular piezoelectric element is regulated by the convex portion. It is characterized in that the electrodes of the piezoelectric elements are each connected to the conductive cap.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. Note that the piezoelectric element used is the same as the conventional one, so its explanation will be omitted.

FIG. 4 shows the structure of the cylindrical body 8. This cylindrical body 8
are made of insulating porcelain, plastic, or the like, and a plurality of convex portions 9a, 9b, 9c, and 9d are formed at symmetrical positions inside both ends of the cylindrical body 8.

FIG. 5 shows an exploded perspective view, and when assembling, the piezoelectric element 1 is inserted into the cylindrical body 8 along between the convex parts 9a and 9b, 9c and 9d, and the cylindrical body into which the piezoelectric element 1 is inserted is Metal caps 11,1 are attached to both ends of the body 8.
The electrode 2a of the piezoelectric element 1 and the metal cap 11, and the electrode 2b and the metal cap 12 of the piezoelectric element 1 are electrically connected by crimping and inserting the electrode 2a and the metal cap 12, respectively. Note that here, the piezoelectric element 1 that is about to rotate along the inner wall of the cylindrical body 8 is restricted by the convex portions 9a to 9d, so that the mounted state is stabilized. Also, metal cap 1
1 and 12 and the electrodes 2a and 2b, for example, conductive rubber is placed inside the metal caps 11 and 12, and the caps are attached to the cylindrical body 8 and electrically connected via the conductive rubber. Alternatively, instead of conductive rubber, conductive adhesive may be applied to the inside of the metal caps 11, 12 and attached to the cylindrical body 8 for electrical connection, or solder paste may be applied to the inside of the metal caps 11, 12. It is possible to coat the tube, attach it to a cylindrical body, heat it, and connect it electrically with solder. Figure 6 shows the finished shape.

In the above embodiment, the cylindrical body 8 is cylindrical, but the same may be true even if it is, for example, a rectangular tube with a rectangular cross section.

Effects of the Invention As explained above, according to the chip-type piezoelectric resonator of the present invention, conductive caps are attached to both ends of a cylindrical body, a rectangular piezoelectric element is disposed therein, and the electrodes of the piezoelectric element are connected to the conductive caps. Because it is connected to a conductive cap, it is compact and can eliminate the conventional lead wires, increasing packaging density and allowing automatic mounting using an automatic insertion machine in the same way as chip components such as resistors and capacitors. becomes. In addition, the piezoelectric element disposed inside the cylindrical body has a stable structure whose position is regulated by a plurality of convex portions, making the piezoelectric element highly reliable.

[Brief explanation of the drawing]

Fig. 1 is an enlarged perspective view of a rectangular piezoelectric element, Fig. 2 is a perspective view of a conventional piezoelectric resonator before being packaged, Fig. 3 is a front view of a conventional piezoelectric resonator after being packaged, and Figs. 6 shows an embodiment of the present invention, FIG. 4 is an enlarged perspective view of the cylindrical body, FIG. 5 is an enlarged exploded perspective view, and FIG. 6 is an enlarged external perspective view after assembly is completed. 1... Rectangular piezoelectric element, 2a, 2b... Electrode,
8... Cylindrical body, 9a to 9d... Convex portion, 11, 12
...Metal cap [conductive cap].

Claims (1)

[Claims] 1. A rectangular piezoelectric element, a cylindrical body having a plurality of protrusions at symmetrical positions along the inside thereof, and a conductive material attached to both ends of the cylindrical body. a rectangular piezoelectric element is inserted into the inside of the cylindrical body, the position of the rectangular piezoelectric element is regulated by the convex portion, and the electrodes of the rectangular piezoelectric element are respectively connected to the conductive cap. chip-shaped piezoelectric resonator. 2. The chip-shaped piezoelectric resonator according to claim 1, wherein the electrode of the rectangular piezoelectric element and the conductive cap are connected by conductive rubber, conductive adhesive, or soldering.