JPH0445350Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to a piezoelectric sounding device used in a telephone handset or the like, and particularly to a soldering portion between its terminal and an insulating substrate.

<Prior art> Fig. 4 and Fig. 5 show an example of a conventional piezoelectric sounding device, in which a piezoelectric vibrator 3 in which a small-diameter piezoelectric element 2 is bonded to the center of the back surface of a large-diameter metal plate 1 is placed in the center. A metal plate 1 is placed in a case 5 made of aluminum or the like with a sound hole 4 formed therein so that the surface of the metal plate 1 faces the sound hole 4, and an annular support edge 6 is formed around the inside of the case 5. The periphery of the metal plate 1 is supported over the entire circumference, and a conductive ring-shaped spacer 7 is arranged on the back surface of the periphery of the metal plate 1. terminal 8,
A circuit board 10 with terminals 9 is arranged, and one terminal 8
and the piezoelectric element 2 on the circuit pattern 1 of the circuit board 10
3 through the contactor 12, and the other terminal 9 and the metal plate 1 are electrically connected through the circuit pattern 13' of the circuit board 10 and the spacer 7,
The periphery of the opening of the case 5 is bent inward and caulked to fix the periphery of the metal plate 1, the spacer 7, and the substrate 10 together.

<Problems to be Solved by the Invention> When using the conventional piezoelectric sounding device as described above as a handset, the terminals 8 and 9 are inserted into the board 10 and the patterns 13 and 13' of the board 10 are fixed after being crimped and fixed.
However, in the case of a handset, the air chamber between the piezoelectric vibrator 3 and the substrate 10 is made small (for example, in order to flatten the frequency characteristics).
0.7 to 0.8 mm), and for this reason, the height of the soldered parts of terminals 8 and 9 becomes a problem, so make the part that protrudes above the board 10 as small as possible as shown in Figure 5. The need arises.

Therefore, there are problems such as the solder 18 is not piled up low, making it impossible to perform sufficient soldering, resulting in poor soldering reliability and poor workability.

<Means for solving the problems> This invention was made in order to solve the problems of the conventional piezoelectric sounding device as described above, and together with the circuit pattern of the terminal attachment part of the circuit board of the piezoelectric sounding device. The soldering portion of the terminal is inserted into a hole provided in the recessed portion, and the terminal is soldered with the solder filled in the recessed portion.

<Example> Figures 1 to 3 show an example of this invention, and the basic structure of the piezoelectric sounding device is the same as the conventional piezoelectric sounding device shown in Figure 4, so the same reference numerals are used. will be added and the explanation will be omitted.

This embodiment is different from the conventional one in that the mounting portions of the circuit board 10 for the terminals 8 and 9 are recessed together with the circuit patterns 13 and 13', respectively.
This is because the recessed portions 16 are formed every 9 times.

A terminal 8 is provided at the center of each recessed portion 16.
9 are provided with insertion holes 17 for the soldering portions, respectively.
After inserting the terminals 8 and 9 into the holes 17 and fixing them by caulking in the conventional manner, solder is poured so that the recess 16 is filled with solder 18, and the terminals 8 and 9 are connected to the circuit in the recess 16. Solder to pattern 13.

Although the recessed portion 16 described above is rectangular in the example shown in FIG. 3, it does not necessarily have to be this shape.
It can be any shape such as an oval.

However, the periphery of the recessed part 16 is sloped as shown in the figure or made into a smooth arc shape to prevent the circuit patterns 13, 13' from being disconnected when the recessed part 16 is formed.

<Effects> As described above, this invention involves recessing the circuit pattern forming portion of the terminal mounting portion of the circuit board of the piezoelectric sound device together with the circuit pattern, and inserting the soldered portion of the terminal into the hole provided in the recess. Since the terminal is soldered using the solder filled in the recessed part, even though the thickness of the circuit board is the same as the conventional one, enough solder is used to connect the soldered part of the terminal and the circuit pattern. It can be completely fixed and the electrical connection is perfect.

Moreover, the amount of solder protruding onto the board is extremely small, making the top surface of the circuit board extremely flat, and the air chamber between the piezoelectric vibrator and the circuit board also becoming flat and small, making it possible to create a piezoelectric sound device with excellent frequency characteristics. can get.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional side view showing an embodiment of the piezoelectric sounding device of this invention, Fig. 2 is a partially cutaway enlarged longitudinal sectional side view showing the soldering state of the same terminal, and Fig. 3 is a partially cutaway plan view of the same. 4 is a vertical side view of a conventional piezoelectric sounding device, and FIG. 5 is a partially cutaway enlarged vertical side view showing the soldered state of the terminals of the same. 10... Circuit board, 13, 13'... Circuit pattern, 16... Recessed portion, 17... Hole, 18... Solder.

Claims (1)

[Scope of utility model registration request] A piezoelectric vibrator, in which a small-diameter piezoelectric element is bonded to the back surface of a large-diameter metal plate, is placed inside a case, and the periphery of this metal plate is supported by the periphery inside the case, and the back surface of the piezoelectric vibrator is In a piezoelectric sound device in which a circuit board having a pair of terminals is arranged, one terminal and the piezoelectric element are electrically connected, and the other terminal and the metal plate are electrically connected, a circuit pattern of a terminal attachment part of the circuit board is provided. A piezoelectric sounding device characterized in that a forming part is recessed together with a circuit pattern, a soldering part of a terminal is inserted into a hole provided in the recessed part, and the terminal is soldered with solder filled in the recessed part.