JPH0619278Y2 - Piezoelectric buzzer - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a piezoelectric buzzer in which a sounding body is arranged in a cylindrical outer case, and in particular, it is automatically inserted by improving the positioning accuracy by chucking. The present invention relates to the structure of an outer case that enables the above.

[Conventional technology]

2. Description of the Related Art As a piezoelectric buzzer provided with a bimorph sounding body that generates a buzzer sound, there is a piezoelectric buzzer conventionally shown in FIG. 4, for example. In the figure, reference numeral 1 is a piezoelectric buzzer, which is a cylindrical outer case 2 made of resin, and a disk-shaped sounding body 4 supported by an annular supporting portion 3 formed in the upper part of the case 2. It is composed of a lid 5 that closes an opening on the lower surface of the case 2, and a power supply terminal 6 that penetrates through the lid 5 and projects to the outside of the case 2. The sounding body 4 is formed by sticking a piezoelectric body 4a made of a piezoelectric porcelain and a vibrating plate 4b made of a metal plate. The piezoelectric body 4a and the vibrating plate 4b are connected to a power supply terminal 6 via lead wires 7, respectively. It is connected. The reference numeral 8 designates a sound output hole formed substantially in the center of the upper surface of the case 2.

In the piezoelectric buzzer 1, when an oscillating drive voltage is applied to the sounding body 4, the piezoelectric body 4a causes a mechanical vibration in the diameter direction due to a piezoelectric phenomenon, and this vibration cooperates with the diaphragm 4b to cause bending mode vibration. And a buzzer sound is generated.

By the way, in the work of mounting the piezoelectric buzzer 1 on a panel surface or a printed board, conventionally, the power supply terminal 6 of the buzzer 1 is manually inserted into a terminal hole formed in the board or the like. There was a problem of poor sex. Therefore, there is a demand for automatic insertion of the piezoelectric buzzer 1 for the purpose of improving productivity in mounting work.

[Problems to be solved by the invention]

However, in order to automatically insert the conventional piezoelectric buzzer 1 by the automatic insertion machine, since the side surface of the outer case 2 of the piezoelectric buzzer 1 is the R surface, there is nothing to be positioned when grasped by the chuck. Therefore, there is a problem in that it is easy to shift, and as a result, the insertion position often shifts and an insertion error occurs. This has made it difficult to adopt an automatic insertion machine conventionally.

Therefore, in order to realize automatic insertion, the piezoelectric buzzer 1 described above is used.
A method of chucking the power supply terminal 6 is conceivable. In this case, since the outer case 2 is usually a small one of about 17 to 30 φmm and the terminal 6 is about 0.8 to 1.2 φmm, the power supply terminal 6 may be deformed. There is. Further, since the terminal 6 is located near the center of the outer case 2 and on the lower surface of the case 2, the moving stroke of the chuck becomes longer, and the chuck cannot be moved vertically upward as it is after the insertion. There is a problem that the operation of the chuck becomes very complicated, and the method of chucking the terminal 6 is not realistic.

An object of the present invention is to provide a piezoelectric buzzer capable of adopting an automatic insertion machine without chucking a power supply terminal by preventing a shift occurring when chucking an outer case.

[Means for solving problems]

The present invention relates to a piezoelectric buzzer in which a sounding body is disposed in a cylindrical outer case whose lower surface opening is closed by a lid. The piezoelectric buzzer extends in the axial direction of the outer case on both outer side surfaces on the diameter line. A positioning rib portion that is arcuate in cross section and that can engage with an engaging recess formed in the chuck of the chucking device is integrally formed, and when the rib portion is mounted, the mounting surface and the lid are The feature is that it is projected downward so that there is a gap between.

[Action]

According to the piezoelectric buzzer of the present invention, the arc-shaped ribs are formed on both side surfaces of the outer case, and the ribs are engaged with the engaging recesses formed in the chuck of the chucking device. The R surface of the rib portion is guided to the R surface of the concave portion and is automatically corrected even if it is slightly displaced during chucking, so that the positioning can be surely performed. As a result, it is possible to eliminate an insertion error due to a shift, and it is possible to adopt an automatic insertion machine.

Further, since it is not necessary to chuck the power supply terminal, the terminal is not deformed, the moving stroke of the chuck is long, and the operation is not complicated.

Furthermore, at the time of mounting on a substrate or the like, the rib portion comes into contact with the mounting surface to form a gap, and this gap suppresses vibration transmission from the piezoelectric buzzer to the mounting surface.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show a piezoelectric buzzer according to an embodiment of the present invention, in which the same reference numerals as in FIG. 4 denote the same or corresponding parts.

In the outer case 2 of the piezoelectric buzzer 1 of the present embodiment, both outer surfaces on the diameter line D of the case 2, that is, outer surfaces facing each other with the center point of the sound output hole 8 therebetween, are arranged in the axial direction of the case 2. A positioning rib portion 10 extending in the direction is integrally formed. Both ribs 10 have a cross section, that is, a substantially semi-circular shape when viewed from a plane, and are provided so as to project slightly from a lower portion of the upper surface of the outer case 2 to the outer side of the lower surface.

Further, the outer peripheral surface of the rib portion 10 and the inner peripheral surface of the concave portion 11a formed in the chuck 11 of the chucking device have substantially the same R surface, whereby the rib portion 10 and the concave portion 11 are formed.
It can be engaged with a.

Next, the function and effect of this embodiment will be described.

The piezoelectric buzzer 1 of this embodiment generates a buzzer sound by applying an oscillation drive voltage to the sounding body 4. When mounting the piezoelectric buzzer 1 on a printed circuit board, first, the outer case 2 of the piezoelectric buzzer 1 is chucked by the chuck 11 of the chucking device. In this case, the recess 11a of the chuck 11 is used.
And the rib portion 10 of the outer case 2 are engaged and gripped. Then, the power supply terminal 6 of the piezoelectric buzzer 1 is inserted into a predetermined terminal hole on the printed board.

As described above, according to the piezoelectric buzzer 1 of this embodiment, the semicircular positioning rib portions 10 are formed on both outer sides of the outer case 2, and the outer peripheral surface of the rib portion 10 and the recess 11 of the chuck 11 are formed.
Since the inner peripheral surface of a is engaged, the position of the piezoelectric buzzer 1 is determined at the same time as the chucking, and rotation and displacement do not occur. Further, in this case, the rib portion 1 is formed by the recess 11a.
When chucking 0, even if the engagement position is slightly deviated, since these engagement surfaces are formed in an arc shape, they can be automatically corrected and reliably positioned. As a result, insertion mistakes due to misalignment can be eliminated, and the piezoelectric buzzer 1
Since the positioning accuracy of can be improved, adoption of an automatic insertion machine can be realized.

In addition, since the rib portion 10 is formed on the outer case 2 in the present embodiment, it is not necessary to chuck the power supply terminal 6, so that even minute parts can be chucked without deforming the power supply terminal 6 and the movement stroke can be extended. ， The problem of complicated operation can be avoided.

Furthermore, since the lower end of the rib portion 10 projects downward from the lid 5, the projecting portion comes into contact with the board when the piezoelectric buzzer 1 is mounted on the printed board, and the rib 5 is placed between the lid 5 and the upper surface of the printed board. A gap is generated, and the vibration of the piezoelectric buzzer 1 is hard to be transmitted to the substrate.

[Effect of device]

As described above, according to the piezoelectric buzzer of the present invention, the piezoelectric buzzer extends on both outer side surfaces on the diametrical line of the outer case so as to project downward in the axial direction of the case, and has an arc shape in a cross section. In addition, since the positioning rib portion that can be engaged with the engaging concave portion formed in the chuck of the chucking device is integrally formed, it is possible to correct the deviation at the time of chucking and surely perform the positioning, and as a result, the automatic insertion is performed. It is possible to improve productivity by suppressing the vibration transmission to the mounting surface.

[Brief description of drawings]

1 to 3 show a piezoelectric buzzer according to an embodiment of the present invention. FIG. 1 (a) is a plan view thereof, FIG. 1 (b) is a side view thereof, and FIG. 1 (c) is a view thereof. Partial sectional front view, FIG. 2 is a plan view showing the rib portion, FIG. 3 is a plan view showing the chucked state, and FIGS. 4 (a) and 4 (b) are conventional piezoelectric piezoelectric elements, respectively. It is a partial cross-sectional side view and a top view which show a buzzer. In the figure, 1 is a piezoelectric buzzer, 2 is an outer case, 4 is a sounding body, 4a is a piezoelectric body, 4b is a vibrating plate, 10 is a rib portion, and 1 is a rib.
Reference numeral 1 is a chuck, and 11a is a recess.

Claims (1)

[Scope of utility model registration request] 1. A piezoelectric buzzer in which a sounding body composed of a vibrating plate and a piezoelectric body is disposed in a cylindrical outer case whose lower surface opening is closed by a lid, wherein both outer surfaces on the diameter line of the outer case. In addition, a positioning rib portion extending in the axial direction of the case, having an arcuate shape in a cross section, and capable of engaging with an engaging recess formed in the chuck of the chucking device is integrally formed,
A piezoelectric buzzer characterized in that the rib portion is projected downward from the lid so that a gap is created between the attachment surface and the lid when the rib portion is attached to the attachment surface.