JP3331482B2 - Piezoelectric receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-mounted piezoelectric receiver which is surface-mounted as an electric component on a wiring board.

[0002]

2. Description of the Related Art In surface mounting, cream solder is applied to component connection positions on a wiring board, and then electronic components such as resistors, capacitors, and semiconductor elements are mounted at each position, and the cream solder is heated and melted. Although this is a method of electrically connecting components to wiring, a conventional piezoelectric handset for telephones is mounted on a handset and is not surface-mounted on a wiring board.

[0003] Recently, with the spread of cordless phones and portable telephones, many electronic components are surface-mounted on a wiring board, and assembly and integration are progressing. Due to this movement, it is necessary to realize the surface mounting of the piezoelectric receiver on the wiring board.

[0004]

However, as shown in FIG. 6, a sound receiving hole 2 is formed in the upper surface of a hollow cylindrical case 1 and an acoustic leakage hole 3 is formed in the lower surface of the case 1 as shown in FIG.
Is open. The sound output hole 2 is an opening for emitting the sound emitted from the piezoelectric vibrator built in the case 1 to the outside of the case, and the acoustic leak hole 3 corrects the frequency characteristics of the sound emitted from the piezoelectric vibrator. It is an opening for.

In the conventional piezoelectric receiver, the terminal drawn out of the case is bent to the lower surface to form a solder connection portion. Therefore, when the surface of the case is mounted on the wiring board 4, the bottom surface of the case almost remains on the substrate. As a result, the sound leakage holes 3 are substantially closed. In order to open the sound leak hole 3, the hole 5 must be provided in the wiring board 4, and the sound leak hole 3 must be opened by the hole 5.

SUMMARY OF THE INVENTION An object of the present invention is to provide a piezoelectric receiver which can be surface-mounted without providing a hole in a wiring board as in the related art.

[0007]

In order to achieve the above object, a piezoelectric vibrator according to the present invention is a piezoelectric receiver in which a piezoelectric vibrator is incorporated in a case, and the piezoelectric vibrator is sounded by piezoelectric vibration. The case is a sound emission hole,
It has an acoustic leakage hole and a leg, and a terminal is attached. The terminal forms a pair and supplies an electric signal from an external circuit to the piezoelectric vibrator. Have
The contact portion is a portion that comes into contact with the piezoelectric vibrator, and the solder connection portion is a portion that is pulled out of the case from the contact portion and protrudes downward, and is soldered to the surface mount product of the substrate, and emits sound. The hole is opened on the upper surface of the case and emits sound emitted from the piezoelectric vibrator to the outside of the case.The acoustic leakage hole is opened on the lower surface of the case and adjusts the frequency characteristics of the sound emitted from the piezoelectric vibrator. The opening to be corrected, the leg portion is a rising portion protruding from the lower surface of the case, supports the case at a fixed height position and separates the sound leakage hole from the surface mounting surface of the case, and at least two or more Two of the legs are provided as a pair, and the paired legs support the solder connection portion of the terminal.

[0008] The pair of legs supporting the solder connection portion of the terminal has a concave portion on the lower surface, and the concave portion receives the solder connection portion and forms a space for accommodating cream solder for surface mounting. Things.

The rising height of the legs ensures a space for mounting components below the case.

The rising height of the leg is 0.5 to 0.5.
2 mm.

[0011]

The lower surface of the case is supported at the rising position of the leg. For this reason, the acoustic leak hole of the case is opened to the atmosphere through a gap between the lower surface of the case and the mounting surface of the board,
The frequency characteristics of the piezoelectric handset are maintained. Also, the legs are
Since the leg is mounted on the mounting surface of the substrate, the terminal can be soldered and the piezoelectric receiver can be surface-mounted on the substrate by mounting the leg on the mounting surface of the substrate. In addition, since the concave portion provided in the leg portion stores cream solder, stable soldering can be performed with the amount of cream solder necessary for soldering. Further, the gap between the lower surface of the case and the mounting surface of the substrate can be used as a mounting space for other components.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG.
1. FIG. 3 is an enlarged bottom view of FIG. 1 along the line II-II in FIG.

In the figure, a piezoelectric receiver according to the present invention comprises:
The piezoelectric vibrator 7 is incorporated in the case 1. The outer peripheral edge of the piezoelectric vibrator 7 is supported by the case 1 so that sound is generated by piezoelectric vibration.

The case 1 has a hollow cylindrical shape, and has a sound emission hole 2.
, A sound leak hole 3 and a leg 6, and a terminal 8 is attached. The terminals 8 form a pair and supply an electric signal from an external circuit to the piezoelectric vibrator 7.
And a solder connection portion 8b. The contact portion 8a is a portion that makes contact with the piezoelectric vibrator 7, and the solder connection portion 8b is
This is a portion that is drawn out of the case 8 from the contact portion 8a and projects downward, and is soldered to the surface mounting surface 9 of the wiring board 4.

The sound output hole 2 is opened on the upper surface of the case 1,
An opening for emitting sound emitted from the piezoelectric vibrator 7 to the outside of the case 1, and the acoustic leak hole 3 is provided on a lower surface of the case 1,
An opening for correcting the frequency characteristics of the sound generated by the piezoelectric vibrator 7.

Four leg portions 6 are projected from the lower surface of the case 1 and support the case 1 at its rising height position. The acoustic leak holes 3 of the case 1 are separated from the surface mounting surface 9 of the substrate 4 to be exposed to the air. Open to the public. Of the four legs, two legs 6a and 6b form a pair, and the paired legs 6a and 6b
It is used as a support surface for the terminals.
As shown in the figure, the terminal 8 is provided corresponding to the position of the solder connection portion 8b, and has a concave portion 10 on the lower surface for receiving the solder connection portion 8b. The remaining leg 6c has a solid cylindrical shape, and is provided at a position where the case 1 is stably supported around the pair of legs 6a and 6b.

The legs 6a and 6b have a retaining groove 6d on the lower surface. The solder connection portion 8b of the terminal 8 is provided with an upright portion 8c which is partially upright.
Is supported by the recessed portions 10 of the legs 6a and 6b, and is locked in the retaining grooves 6d, so that the solder connection portions 8b are retained. Therefore, the solder connection portion 8b of the terminal does not fall out of the case 1.

In the embodiment, the piezoelectric receiver is connected to the wiring board 4.
When the piezoelectric receiver is mounted on a surface of the wiring board 4 with the acoustic leak hole 3 of the case 1 facing the wiring board 4, the piezoelectric receiver is mounted on a surface mounting surface 9 of the wiring board 4. Mount on top. The melted cream solder on the wiring board 4 penetrates into the recessed portions 10 of the pair of leg portions 6a and 6b, and after being melted, solidifies to form the solder connection portion 8b.
Is soldered to the surface mounting surface 9. The solder necessary for soldering the solder connection portion 8b and the surface mounting surface 9 of the substrate 4 is as follows:
Since it is also received in the recessed portions 10 of the legs 6a, 6b, stable soldering is performed with the amount of cream solder required for soldering.

A gap S corresponding to the rising height of the legs 6a to 6c is provided between the lower surface of the case 1 and the surface mounting surface 9 of the wiring board 4, and an acoustic leak hole provided on the lower surface of the case 1 3 is opened to the atmosphere through the gap S, and the frequency characteristics of the piezoelectric receiver are maintained.

According to this embodiment, the gap S formed between one surface of the case 1 and the surface mounting surface 9 of the wiring board 4 is
It is set in the range of 0.5 mm to 2 mm. This gap S
Is 0 mm, that is, when the acoustic leak hole 3 of the case 1 is sealed with the surface mounting surface 9 of the substrate 4, the frequency characteristic of the piezoelectric receiver is disturbed as shown in FIG. You will not be able to demonstrate. When the gap S is 0.44 mm, the frequency characteristic of the piezoelectric receiver is disturbed as shown in FIG. 7, as in FIG. On the other hand, the gap S is 0.8 mm as shown in FIG. 7, the gap S is 1.32 mm as shown in FIG. 7, and the gap S is 1.76 as shown in FIG.
mm, the frequency characteristic of the piezoelectric receiver is substantially flat in the range of the used frequency band of about 300 Hz to 1,200 Hz. When the gap S is set to 2 mm or more, the effect is not so different from the case of FIG.

Therefore, as is clear from the frequency characteristics of FIG. 7, it is understood that the gap S is insufficient when the gap is 0.5 mm or less, is sufficient when it is 2 mm, and does not need to be increased to 2 mm or more.

In the embodiment, four legs 6a, 6b, 6c are provided. However, the number of legs is not limited to four. At least two legs may be provided. May be used. Further, the remaining leg 6c has a columnar shape, but the shape is not limited.

[0023]

As described above, according to the present invention, it is possible to mount the piezoelectric receiver on the surface without making a hole in the wiring board, and to lift and support the case upward from the surface mounting surface. In addition, the frequency characteristic of the piezoelectric receiver can be maintained by maintaining the sound leak hole of the case in an open state.

Further, since a gap is secured between the wiring board and the case, other electronic components can be mounted using this gap without blocking the acoustic leak hole, and the mounting efficiency of the wiring board is improved. Can be improved.

Further, since the solder necessary for soldering the solder contact portion of the terminal and the board is also received in the recessed portion of the leg, stable soldering can be performed with the necessary amount of solder. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged bottom view of FIG. 1;

FIG. 4 is a perspective view showing an example of a leg used in one embodiment of the present invention.

FIG. 5 is a perspective view showing an example of a leg used in one embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional example.

FIG. 7 is a diagram illustrating frequency characteristics of the piezoelectric receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Sound emission hole 3 Sound leak hole 4 Wiring board 6, 6a, 6b, 6c Leg 6d Retaining groove 7 Piezoelectric vibrator 8 Terminal 8a Contact part of terminal 8b Solder connection part of terminal 8c Standing part of solder connection part 9 Surface mounting surface 10 Depression of leg

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-110080 (JP, A) JP-A-61-21199 (JP, U) JP-A-5-25497 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) H04R 17/00 H04M 1/03

Claims (4)

(57) [Claims] 1. A piezoelectric receiver in which a piezoelectric vibrator is incorporated in a case, wherein the piezoelectric vibrator emits sound by piezoelectric vibration. The case includes a sound emission hole, an acoustic leakage hole, and a leg. A terminal is attached, the terminals form a pair, and supply an electric signal from an external circuit to the piezoelectric vibrator.The terminal has a contact portion and a solder connection portion. The solder connection part is a part that is pulled out of the case from the contact part and protrudes downward, and is soldered to the surface mount product of the board. The sound leakage hole is an opening that is opened on the upper surface of the case and emits the sound emitted from the piezoelectric vibrator to the outside of the case, and is an opening that is opened on the lower surface of the case and corrects the frequency characteristics of the sound emitted from the piezoelectric vibrator. Yes, the leg is a rising part protruding from the bottom of the case Yes, the case is supported at a fixed height position to separate the acoustic leakage hole from the surface mounting surface of the case, and at least two or more are provided. Of these legs, two legs form a pair, A pair of legs supports a solder connection portion of the terminal, and is a piezoelectric receiver. 2. A pair of legs supporting the solder connection portion of the terminal has a concave portion on a lower surface, and the concave portion receives the solder connection portion and forms a space for accommodating cream solder for surface mounting. The piezoelectric handset according to claim 1, wherein 3. The piezoelectric receiver according to claim 1, wherein the rising height of the leg portion secures a space for mounting components under the case. 4. The rising height of the leg portion is 0.5 to 2 m.
The piezoelectric receiver according to claim 1, 2, or 3, wherein m is m.