JPH0230921Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to energy-trapped electronic components such as oscillators, resonators, and filtration devices using piezoelectric substrates. The present invention relates to a piezoelectric resonator in which a lead wire is provided with an enlarged portion so that the dimension in the direction crossing the direction is also increased.

This type of product has electrodes, lead wire attachment terminals, etc. formed on a piezoelectric substrate by metal vapor deposition or printing with conductive paint, and after soldering the lead wires, it is covered with an exterior resin, so there is a gap between the outside of the electrode and the exterior resin. Advances in the technology for forming voids have enabled the miniaturization of piezoelectric substrates, and have reached a state where the demands for product miniaturization and cost reduction are almost satisfied. However, with the recent rise in the price of resources, there is an urgent need for further resource conservation measures, but if the product is made smaller than necessary, it will not be possible to secure the area required for displaying the product's specifications, manufacturer, trademark, product number, etc. .

In addition, the strength of the product is greatly influenced by the exterior resin as well as the main body; however, as the body becomes smaller, the amount of exterior resin adhered to the product decreases, which inevitably reduces the mechanical strength of the product and makes it more susceptible to damage. In addition, when inserting a product into a printed circuit board, there are problems such as poor workability if the product is too small.

Furthermore, as shown in FIGS. 1 to 3, there is a device in which an enlarged portion is provided on the lower side of the piezoelectric resonator of the lead wire.

The shape of the enlarged portion ₃ is not limited to the rectangular shape as shown in FIG. ₁ , but as shown in _FIG . The shape of the enlarged portion 3 may be changed arbitrarily, such as by making the side corresponding to the intermediate terminals 3 and 3 a recessed side 3b with a constant gap from the intermediate terminal, and making the surface of the exterior resin 4 smooth. Can be done.

Also, Fig. 3 shows the horizontally long main body a enlarged in the vertical direction, and the points in Fig. 1 are that the lead wires t ₁ and t ₂ ,
As a result of the pitch of t ₃ being regulated to 2.5 mm, the lead wires attached to the lead wire mounting terminals b ₁ and b ₂ on both sides
The enlarged portions 3, 3 of t ₁ and t ₂ expand outward, and the soldered portions 2, 2 are also formed closer to the outside than the lead wires t ₁ and t ₂ to match the position of the lead wire attachment terminal. It is.

However, while the direction in which the product can be expanded is fixed, the shape of the main body a can be horizontally long, vertically long, or other various shapes, and the position and number of lead wire attachment terminals are also not constant. If used, the necessary external dimensions will not be obtained.

This invention eliminates the problems caused by being too small without sacrificing the advantages of reducing product costs due to the miniaturization of the main body as described above. The lead wire is provided with an enlarged portion so that the dimension in the direction intersecting the wire lead-out direction is also increased.

Embodiments of this invention will be described below with reference to FIGS. 4 to 6 of the accompanying drawings.

In Fig. 4 or Fig. 5, the main body a of the piezoelectric filter is formed with electrodes (not shown) and lead wire attachment terminals b ₁ , b ₂ , b ₃ by known means such as vapor deposition of metal or printing with conductive paint. Appropriately placed according to purpose,
The surface of the electrode is masked with wax or the like to form voids.

Figure 4 shows a typical body of a three-terminal filtration device that has lead wire attachment terminals b ₁ , b ₂ , and b ₃ at both corners of a piece of substrate and at the center of the back surface, increasing both the length and width of the piezoelectric resonator. In case, lead wire mounting terminal on both sides B ₁ ,
The enlarged portion 3 of the lead wires t ₁ and t ₂ attached to b ₂ consists of a 3w portion along the side of the main body and a 3h portion along the lower side, and the soldered portion 2 is formed in the enlarged portion 3h.

In this case, if the width of the 3h portion is increased, the middle lead wire _t3 can be a normal single lead wire, and the first
An enlarged portion may be provided as shown in FIGS. 3 to 3. Fig. 5 is also an embodiment for increasing the length and width of the main body a, and the lead wire mounting terminals b ₁ and b ₂ are on both sides of the main body, and b ₃ is on the lower side, and the lead wires t ₁ ,
The enlarged part ₃ of t2 is formed along both sides of the main body a, the soldered part 2 protrudes to the side of the enlarged part 3, and the lead wire _t3 is formed horizontally in both directions along the lower side of the main body a. ing.

Following the soldering portion 2 of the lead wires t ₁ , t ₂ , t ₃ to be soldered to the lead wire mounting terminals b ₁ , b ₂ , b ₃ , an enlarged portion 3 of the required width and length is formed and the soldering portion is 2 to the lead wire attachment terminals b ₁ , b ₂ , and b ₃ , the main body a and the lead wire enlarged portion 3 are covered with an exterior resin 4 by a known dipping method or powder coating method, and a suitable coating is applied. The masking of the electrode is melted by heating and absorbed into the exterior resin 4 to form a gap necessary for vibration around the electrode, and a necessary display is made by printing or other means on the surface of the exterior resin.

The necessary width and length of the lead wire enlarged portion 3 are determined with the aim of reducing the size of the main body a while keeping the external size of the product as large as conventional products. If the distance between the enlarged line parts 3 increases, the exterior resin 4 will not adhere continuously, and even if it adheres continuously, the outer surface will be uneven, which will worsen the appearance of the product and make it difficult to display. If the gap is too small, it will be difficult to fill the gap with the exterior resin, which may cause a short circuit between the lead wires. Therefore, it should be made as small as possible to allow the exterior resin to enter, so as not to cause unevenness on the surface.

As is clear from the above embodiments, according to the present invention, the size of the product can be maintained at the same level as before while reducing the size of the main body a, thereby ensuring the area and shape necessary for various displays, and improving workability during assembly. make things better. Furthermore, the amount of the sheathing resin deposited increases, increasing the mechanical strength of the product, and the mounting strength of the lead wires is further enhanced by the resin sheathed in the enlarged portion. Furthermore, since the lead wire is usually manufactured in a continuous form by punching sheet metal as shown by the solid line in Figure 6, even if the enlarged part of the present invention is formed as shown by the chain line in Figure 6, the material and manufacturing process will be Since they are the same, providing the enlarged portion does not particularly increase the manufacturing cost of the lead wire. Therefore, the effect of reducing the cost of the product due to the miniaturization of the main body is not impaired.

[Brief explanation of the drawing]

Figures 1 to 3 are front views of an energy trap type electronic component with the exterior resin cut away, Figures 4 and 5 are front views of the exterior resin cut away in an embodiment of the present invention, and Figure 6 is a lead FIG. 3 is an explanatory diagram of a method for manufacturing a line. a...Piezoelectric resonator body, _b1 , _b2 , _b3 ...Lead wire attachment terminals, _t1 , _t2 , _t3 ...Lead wires, 2...
Soldering part, 3... Enlarged part of lead wire, 4...
Exterior resin.

Claims (1)

[Scope of utility model registration request] The lead wire attached to the lead wire attachment terminal of the piezoelectric resonator body with the necessary electrodes and lead wire attachment terminals formed on the piezoelectric substrate is provided with an enlarged part with enlarged dimensions in the lead wire lead-out direction and the direction intersecting the lead wire lead-out direction. A piezoelectric resonator that is provided along the lower and side sides of the main body and has the enlarged portion covered with an exterior resin along with the main body.