JPH0445359Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a buzzer suitable for application to, for example, a piezoelectric buzzer with pins, in which lead terminals can be directly inserted and soldered onto a printed circuit board.

Conventionally, this type of buzzer, for example,
As shown in the figure, the piezoelectric buzzer element 1 is attached to the support plate 9 of the buzzer case 2, the support plate 9 is fixed to the base 3, and the terminal 4 is supported by the base 3 of the piezoelectric buzzer and directly connected to the piezoelectric buzzer element 1. They are in contact and maintain continuity.

Therefore, when the terminal 4 is soldered to a board or the like, heat reaches the point of contact with the buzzer element 1 through the terminal 4, and in extreme cases, there is a drawback that the contact point between the terminal 4 and the buzzer element 1 is separated.

In view of this, the present invention aims at the stability of the contact part by separating the buzzer element and the terminal part, and prevents the buzzer element from being affected by the heat during soldering and by the external force of the terminal protruding from the case. The main purpose is to propose this type of buzzer that does not affect the contact area between the element and the terminal.

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

FIG. 2 is a diagram showing an example of the present invention. Reference numeral 2 denotes a sounding body case, which is composed of a case body 21 having an open end at one end, and a lower case 22 attached to the opening of the case body 21. A sound emitting hole 23 is formed on the upper surface of the case body 21, and a piezoelectric buzzer element 1 in which a metal disc 24 and a piezoelectric ceramic 25 are bonded together is held on the circumferential wall of the case body 21 at its outer circumference. , and the upper end of the lower case 22. Note that the element 1 is attached with the piezoelectric element 25 facing the opening side of the case body 21.

The lower case 22 has a number of terminals (for example, two).
Square or round terminal attachment holes 15 are provided in the attachment portions that protrude to the front and back of the lower case 22 according to the requirements. A recess 16 is provided in the middle of the inner circumference of the attachment hole 15. The pin terminal 4 is attached to this attachment hole 15.

As shown in FIG. 6, the pin terminal 4 is made of stainless steel, brass, phosphor bronze, etc., and has a terminal portion 41,
Engagement part 42 to lower case 22, this engagement part 42
A coil contact portion 44 which is bent and extended at a substantially right angle is integrally molded, and a protruding tongue portion 45 having spring properties is formed on the engaging portion 42 .

Therefore, by inserting the pin terminal 4 downward from above the lower case 22, the tongue portion 45 of the pin terminal 4 is once pressed inward, but the case 22
Since it will expand again at the recess 16, even if you try to pull out the pin 4 upward, this tongue piece 4
Once the pin terminal 5 is caught on the upper wall of the recess 16, it cannot be pulled out, and the pin terminal 4 is then securely engaged.

The coil contact portion 44 of the pin terminal 4 extends to the coil spring storage holder 7, as shown in FIGS. 3 and 4.

The coil spring storage holder 7 has a cylindrical shape with an open upper part and has a notch 71 where the contact part 44 is installed, and is integrally molded with the lower case 22. and storage holder 7
A coiled spring 6 having an outer circumferential diameter substantially close to the inner circumferential diameter of the piezoelectric buzzer element 1 is incorporated into the storage holder 7 so that the metal disk 24 of the piezoelectric buzzer element 1 and the pin terminal 4 are electrically connected. .

In other words, the coil spring contact portion 45 of the pin terminal 4
As shown in Fig. 7, the tip has a protruding shape,
The tip is fitted into the inner diameter portion of the coil spring 6.
In addition, the tip of the coil spring contact portion 45 is made concave,
They may be fitted together.

Therefore, since the cylindrical coil spring storage holder 7 is arranged straight upward, the displacement of the coil spring 6 is limited to only vertical movement.
Pressure contact of the spring 6 between the piezoelectric buzzer element 1 and the coil contact portion 44 of the terminal 4 is ensured.

As described above, according to the present invention, in a buzzer in which a coiled spring is electrically contacted between a buzzer element and a terminal, a holder for storing the spring is provided in the buzzer case, and one of the terminals is connected to the buzzer. The external terminal was fitted into a hole formed in the case and protruded, and the other end was extended to the bottom of the holder located at a distance along the bottom of the case to make electrical contact between the terminal, the spring, and the buzzer element. , it is possible to provide a buzzer with a structure that stabilizes the contact area between the buzzer element and the terminal and eliminates the influence of heat due to soldering.

In other words, even if heat adversely affects the buzzer element through the terminal when soldering the terminal to the board, the heat will not be conducted directly to the buzzer element, but the other side of the terminal will be placed at a distance along the bottom of the case. Because it extends to the bottom of the holder,
Since the dissipation of the heat is promoted during this time, there is an effect that almost no heat reaches the buzzer element. Note that by employing a non-conducting spring as the coil spring, the heat can be more reliably blocked.

Further, it is possible to prevent unnecessary pressure from being exerted on the contact portion between the piezoelectric buzzer element and the terminal due to external force of the terminal protruding from the case.

Furthermore, according to the present invention, the stability due to the wire contact by the spring is improved. In other words, conventionally, the terminal pin and the buzzer element are in a point contact state, which tends to cause poor contact, but according to the present invention, the coil spring and the piezoelectric body The end face of the coil spring makes almost line contact with the terminal pin, and the contact between such members has the effect of becoming more robust.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventional buzzer of this type.
2 and 5 are longitudinal and transverse sectional views showing one embodiment of the present invention, FIG. 3 is a sectional view of the main parts of the present invention, FIG. 4 is a plan view for explaining the terminal, and FIG. FIG. 6 is a perspective view showing one embodiment of the terminal, and FIG. 7 is a diagram showing another example of the terminal. 1...Buzzer element, 2...Sounding body case, 4...Terminal, 6...Coil spring, 7...Coil spring storage holder, 15...Terminal installation hole, 2
1...Case body, 22...Lower case, 41...
Terminal part, 42... Engagement part, 44... Contact part, 45
...tongue piece.

Claims (1)

[Claims for Utility Model Registration] 1. In a buzzer in which a coiled spring is electrically contacted between a buzzer element and a terminal, a holder for storing the spring is provided in a buzzer case, and one of the terminals is attached to the case. The external terminal is fitted into a hole formed in the case and protrudes, and the other end is extended to the bottom of the holder located at a distance along the bottom of the case to make electrical contact between the terminal, the spring, and the buzzer element. Features a buzzer. 2. The buzzer according to claim 1, wherein the coiled spring is made of a non-conductor.