JP2522289Y2 - Lead wire lead-out structure for piezoelectric buzzer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a lead-out structure of a piezoelectric buzzer that generates a sound by driving a diaphragm by deformation of a piezoelectric element bonded on the diaphragm.

(Prior Art) Conventionally, as a piezoelectric buzzer, for example, the one shown in FIG. 7 is well known.

In the piezoelectric buzzer, a piezoelectric sounding body 2 is housed inside an outer case 1 having an open end, and lead wires 3 and 4 drawn from the piezoelectric sounding body 2 are connected to a peripheral wall 5 of the outer case 1 from an opening end face. A notch 6 cut out toward the inside of the outer case 1 is drawn out of the outer case 1 and is formed on a lid member 7 fitted and fixed in an opening of the outer case 1. The notch part 8 is fitted in the notch part 6, and the notch part bottom surface 6 a formed at the innermost part of the notch part 6 and the opposing surface 8 a of the notch part 8 opposed thereto are formed. The lead wires 3 and 4 are sandwiched between them. The piezoelectric sounding body 2 is obtained by bonding a piezoelectric element 12 to a vibration plate 11, and a peripheral portion of the vibration plate 11 is placed on a step 5a formed on a side wall 5 of the outer case 1. (Not shown). One end 4a of the lead wire 4 is soldered to the electrode 13 of the piezoelectric element 12 of the piezoelectric sounding body 2.
One end 3a of another lead wire 3 is soldered to the vibration plate 11. When an electric signal is applied to the lead wires 3 and 4, the piezoelectric element 12 is deformed and the diaphragm 11 is driven to generate a sound. This sound is radiated out of the outer case 1 through the holes 14 formed in the outer case 1.

By the way, in the piezoelectric buzzer shown in FIG. 7, the lead wires 3 and 4 are pinched between the notch bottom surface 6a of the notch 6 of the outer case 1 and the opposing surface 8a of the pressing portion 8 facing the notch to prevent the lead wires. As described above, the lid member 7 is fixed to the outer case 1 with a solvent or the like in a state where the lid member 7 is abutted against another step 5b of the peripheral wall 5 formed near the opening of the outer case 1. However, the notch bottom surface 6a of the notch 6 and the opposing surface 8a of the holding portion 8 are both flat. Therefore, when a tensile force is applied to the lead wires 3 and 4 during transportation of the piezoelectric buzzer or handling by a user,
The lead wires 3 and 4 slide between the notch bottom surface 6a of the notch portion 6 of the outer case 1 and the opposing surface 8a of the holding portion 8, so that the soldering of the lead wires 3 and 4 comes off. There has been a problem that a force is applied to the piezoelectric sounding body 2 from the lead wires 3 and 4 to deteriorate the characteristics of the piezoelectric buzzer.

(Purpose of the Invention) The purpose of the present invention is to provide a highly reliable piezoelectric buzzer that ensures that the lead wire is fixed to the outer case and the cover member, and that the lead wire does not come off or the soldering does not come off due to the force applied to the lead wire. Is to provide a lead wire drawing structure.

(Constitution of the Invention) For this reason, in the present invention, the sounding body is housed in an outer case having an open end, and the lead wire drawn out of the piezoelectric sounding body is inserted into the outer case from the opening end face to the peripheral wall of the outer case. A holding portion formed on a lid member that is pulled out of the notch portion cut out toward the outside of the outer case and that is fitted and fixed to an opening portion of the outer case fits into the notch portion. A lead-out structure for a piezoelectric buzzer in which the lead wire is sandwiched between a bottom surface of the notch formed at the innermost portion of the notch and an opposing surface of the pressing portion facing the notch. , The lid member has a protrusion protruding toward the inside of the outer case along the inner peripheral surface of the outer wall of the outer case in the vicinity of the protruding base of the holding portion, and the protrusion and the outer wall of the outer case are provided. And the interval and above The difference between the lead wire diameter is 0.2 mm or less, and the difference between the protrusion size of the protrusion and the lead wire diameter is
0.2 mm or more, and by fixing the lid member to the opening of the outer case, the protrusions and the pressing portions extend the lead wire from the inner peripheral surface of the peripheral wall of the outer case along the cutout bottom surface by 90 degrees or less. The lead wire is formed by forming so as to be sharply bent at the following angles.

When the lid member is fitted and fixed to the opening of the outer case,
The lead wire extends from the inner peripheral surface of the peripheral wall of the outer case to the notch bottom surface by the projection and the holding portion of the lid member.
Formed to bend sharply to an angle of 90 degrees or less. Thereby, the lead wire is prevented from being pulled out of the outer case.

(Effects of the Invention) According to the present invention, the projection protruding from the lid member protrudes toward the inside of the exterior case along the inner peripheral surface of the peripheral wall of the exterior case in the vicinity of the protruding base of the pressing portion of the lid member. And the difference between the distance between the protrusion and the peripheral wall of the outer case and the wire diameter of the lead wire is 0.2 mm or less, and the difference between the protrusion dimension of the protrusion and the wire diameter of the lead wire is 0.2 mm or more. Just by fitting and fixing the lid member to the opening of the outer case, the lead wire is 90 degrees from the inner peripheral surface of the peripheral wall of the outer case to the notch bottom surface by the protrusion and the pressing portion of the lid member. Or, it is formed so as to be sharply bent to an angle smaller than that, and the forming and the rigidity of the lead wire can obtain a sufficient tensile strength of the lead wire, and therefore, a large tensile force is applied to the lead wire. Is added Dislodged soldering with its piezoelectric sounding body also displaced in the pulling direction is the lead line, without having to leave or outer casing, can be obtained structure for drawing out lead wires reliable piezoelectric buzzer.

(Example) Hereinafter, an example of the present invention is described with reference to an accompanying drawing.

 FIG. 1 shows a piezoelectric buzzer to which the present invention is applied.

The piezoelectric buzzer described above with reference to FIG. 7 is provided with a projection 21 protruding along the inner peripheral surface of the peripheral wall 5 of the outer case 1 near the protruding base of the pressing portion 8 of the lid member 7. Projection 21 and peripheral wall 5 of exterior case 1 facing it
The lead wires 3 and 4 are drawn out of the outer case 1 from between the inner peripheral surface of the notch 6 and the gap between the notch bottom 6a of the notch 6 and the opposing surface 8a of the pressing portion 8 opposed thereto. The seventh
Corresponding reference numerals are given to portions corresponding to the drawings, and redundant description will be omitted.

In this way, the lead wire can be formed simply by aligning the holding portion 8 of the lid member 7 with the notch 6 of the outer case 1 and fitting and fixing the lid member 7 to the opening of the outer case 1. 3,4
As can be seen from FIG. 2, the protrusion 21 of the cover member 7 and the pressing portion 8 sharply extend from the inner peripheral surface of the peripheral wall 5 of the outer case 1 to approximately 90 degrees along the cutout bottom surface 6a. It is formed so that it is bent. Due to the forming of the lead wires 3 and 4 and the rigidity of the lead wires 3 and 4, even if a large tensile force is applied to the lead wires 3 and 4,
These lead wires 3 and 4 do not slip out of the outer case 1 due to displacement in the pulling direction, and the soldered portions 3a and 4a do not come off.

FIGS. 3 and 4 show the measurement results of the tensile strength of the lead wires 3 and 4 of the above embodiment.

FIG. 3 shows the relationship between the distance A between the protrusion 21 of the cover member 7 and the peripheral wall 5 of the outer case 1 (see FIG. 2), the diameter of the lead wires 3 and 4, and the lead wire tensile strength. Is shown. FIG. 4 shows the relationship between the difference between the protrusion dimension B of the projection 21 of the cover member 7 (see FIG. 2) and the diameter of the lead wires 3 and 4, and the lead wire tensile strength. However, in FIG. 3, (B dimension)-(lead wire diameter) is fixed to 1.3, and in FIG.
In the drawing, (A dimension)-(lead wire diameter) is fixed to 0.

From FIG. 3, (B dimension)-(lead wire diameter) = 1.3
In the case of (1), in order for the lead wire tensile strength to be 1.0 kg or more, the difference between the dimension A and the lead wire diameter needs to be 0.2 mm or less. That is, it is necessary that (A dimension)-(lead wire diameter) =-0.2 to +0.2 mm.

Also, from FIG. 4, (A dimension)-(lead wire diameter)
In the case of = 0, it is necessary that the dimension B is 0.2 mm or more than the lead wire diameter so that the lead wire tensile strength becomes 1 kg or more.

In the above embodiment, as shown in FIG. 5, the notch bottom 6a of the notch 6 of the outer case and the lid facing the notch 6 are formed so that the lead wire 3.4 is formed at an angle smaller than 90 degrees. The opposing surface 8a of the holding portion 8 of the member 7 may be formed to be inclined.

As shown in FIG. 6, the projection 21 has a thickness of a protruding base portion slightly smaller than that of FIG. 2 and is formed so as to be elastically deformable, and the projection 21 is pressed against the lead wires 3 and 4. You may do so.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment of the lead-out structure of the piezoelectric buzzer according to the present invention, FIG. 2 is a partially cutaway sectional view of the lead-out structure of the piezoelectric buzzer of FIG. FIG. 4 and FIG. 4 are characteristic diagrams showing the measurement results of the tensile strength of the lead wire, respectively. FIG. 5 and FIG. 6 are partially cutaway sectional views of a modified example of the lead wire drawing structure of the piezoelectric buzzer of FIG. FIG. 7 is a partially cutaway perspective view of a conventional lead-out structure of a piezoelectric buzzer. 1: exterior case, 2: piezoelectric sounding body, 3, 4: lead wire, 5
... peripheral wall, 6 ... notch, 6a ... notch bottom, 7 ... lid member, 8 ... holding part, 8a ... opposing surface, 21 ... projection.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideki Sakamoto 2-26-10 Tenjin, Nagaokakyo-shi Inside Murata Manufacturing Co., Ltd. (JP, U) Japanese Utility Model Showa 61-125716 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A sounding body is accommodated in an outer case having an open end, and a lead wire drawn out of the piezoelectric sounding body is cut into a peripheral wall of the outer case from an opening end face toward the inside of the outer case. The notch is drawn out of the outer case, and a holding portion formed on a lid member that is fitted and fixed to the opening of the outer case is fitted in the notch, and the notch is provided. A lead-out structure for a piezoelectric buzzer in which the lead wire is sandwiched between a bottom surface of a notch formed at the innermost portion of the portion and an opposing surface of the pressing portion facing the notch; A protrusion protruding toward the inside of the outer case along the inner peripheral surface of the outer wall of the outer case in the vicinity of the protruding base of the holding portion; a distance between the protrusion and the outer wall of the outer case; Difference with the wire diameter of 0.2 mm or less, the protrusion size of the protrusion is larger than the wire diameter of the lead wire, and the difference between the protrusion size of the protrusion and the wire diameter of the lead wire is 0.2 mm or more,
By fixing the lid member to the opening of the outer case, the protrusions and the pressing portions abruptly move the lead wire from the inner peripheral surface of the peripheral wall of the outer case along the cutout bottom surface to an angle of 90 degrees or less. A lead wire drawing structure for a piezoelectric buzzer, wherein the lead wire is formed by bending and holding the lead wire.