JPS6019439Y2 - ultrasonic ceramic microphone - Google Patents

Description

[Detailed description of the invention] The present invention relates to a drip-proof ultrasonic ceramic microphone for outdoor use, which has a shape that makes it easy to install in various devices, and at the same time has stable sensitivity-frequency characteristics. The purpose is to provide the desired shape.

A conventional ultrasonic ceramic microphone of this type will be explained with reference to FIG.

In the figure, 1 is a case, and a piezoelectric ceramic vibrator 2 is bonded to the closed end surface of the case to form a vibrating section.

This case 1 has side portions thicker than the closed end surface to provide a difference in mechanical impedance and provide a vibration damping effect.

Reference numeral 3 denotes a terminal plate consisting of a metal base and a resin plate, and is attached to the open end of the case 1 via an elastic adhesive 4.

Further, 5 and 5' are terminals, and 6 and 6' are lead wires.

In this case, since the shape of the side of the case is cylindrical with a uniform surface, it is difficult to attach it to the equipment, and if the mounting area is increased and the installation is firm, it will provide vibration damping and tend to deteriorate the temperature characteristics. It was hot.

SUMMARY OF THE INVENTION An object of the present invention is to provide a microphone that improves the conventional drawbacks, reduces vibration damping, reduces high-order resonance generated from the side of the case, and is easy to install.

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

Reference numeral 7 denotes a case, which is composed of a truncated conical portion having a closed end surface 7a and a side sloped portion 7b, and a curved portion 7c provided continuously with the side surface sloped portion 7b.

The curved portion 7c has an open end and has at least one inwardly curved portion and one outwardly curved portion.

A piezoelectric ceramic vibrator 8 is bonded to the closed end surface 7a of the case 7 to form a vibrating section.

9 is a terminal board consisting of a metal base 10 and a resin plate 11;
It is attached to the open end of the case 7.

Further, 12 and 12' are terminals, and 13 and 13' are lead wires.

According to the present invention having the above structure, since the side part of the case 7 has a curved shape, the vibration of the vibrating part is not transmitted to the side part, and the vibration is extinguished in the curved part. Only the shape resonance of the part can generate vibration and acoustic output.

The greater the number of abdomens in the curved portion, the better the effect, but if the number is too large, the shape will become large, so about 2 to 3 is good.

Then, using the groove of the curved part (inwardly curved part),
As shown in FIG. 3, the fixing comb ring 14 is fitted into the groove of the case of the microphone 15 constructed as described above, and the rubber ring 14 can be used to attach it to the device 16.

Therefore, it can hold a part of the microphone body and have a sufficient buffering effect against front, rear, left and right shocks, and it also reduces strain on the case dimensions and the fixing rubber ring due to changes in sound intensity. , the sensitivity-frequency characteristics are stable.

Here, since the inclined surface of the truncated conical portion of the case needs to have dimensions that facilitate resonance with the vibration surface, its inclination angle and length are important in design.

In this way, the effect of the curved part of the case in the present invention is to alleviate mechanical strain and improve the electro-acoustic conversion efficiency, and by adopting this shape, it is possible to achieve high sensitivity and
The frequency characteristics are stable.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional ultrasonic ceramic microphone, FIG. 2 is a cross-sectional view showing an embodiment of the ultrasonic ceramic microphone according to the present invention, and FIG.
The figure is a sectional view of a main part showing an example of how the microphone of the present invention is attached to a device. 7...Case, 7a...Closed end surface, 7b
...... Side slope part, 7c... Curved part, 8
...Piezoelectric ceramic vibrator, 9...Terminal board.

Claims (1)

[Scope of utility model registration request] In an ultrasonic ceramic microphone in which a piezoelectric ceramic vibrator is bonded to the closed end surface of a case body, and the open end of the other end of the case is sealed with a terminal plate, the case is formed into a conical shape consisting of a closed end surface and a sloping side surface. An ultrasonic ceramic microphone comprising a trapezoidal part with an inclined side surface and a curved part with a continuous open end, the curved part having at least one portion projecting outward.