JPS5919517Y2 - piezoelectric speaker - Google Patents

Description

[Detailed description of the invention] The present invention relates to a piezoelectric speaker equipped with a piezoelectric vibrator that vibrates due to the deflection of a flat plate, and improves the connecting portion between the diaphragm and the piezoelectric vibrator to shorten the drying time of the adhesive and improve the bonding condition. This is intended to provide information that can be used to confirm the following.

Conventional piezoelectric speakers are constructed by bonding, with adhesive, a flat piezoelectric vibrator that flexibly vibrates to the center of a cone-shaped diaphragm fixed to the peripheral edge of a frame.

In particular, adhesive is applied to the top of the cone-shaped diaphragm and the center of the piezoelectric vibrator to bond them together, but the solvent in the adhesive volatilizes and diffuses, making drying and curing time-consuming, reducing productivity. In addition, it is not possible to confirm during the assembly process whether or not the diaphragm and piezoelectric vibrator are reliably connected, which is a significant disadvantage in terms of quality.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

Reference numeral 1 denotes a frame made of synthetic resin, and a supporting protrusion 2 with a sharp tip is provided on the inner bottom of the frame 1.
On this supporting protrusion 2 is a piezoelectric vibrator 3 which vibrates as a flat plate.
is located.

The top of a cone-shaped diaphragm 4 is bonded to the center of the piezoelectric vibrator 3 with an adhesive 5.

Moreover, a plurality of small holes 6 are formed at the top of the diaphragm 4, and the solvent of the adhesive 5 is volatilized and evaporated from the small holes 6 to accelerate drying and hardening of the adhesive 5. The configuration is such that the bonding state between the piezoelectric vibrator 3 and the diaphragm 4 by the adhesive 5 can be confirmed through the small hole 6.

The peripheral edge of the diaphragm 40 is bonded to the peripheral edge of the frame 1 with an adhesive.

Further, a lead wire 7 is drawn out from the piezoelectric diaphragm 3,
It is electrically connected to a terminal 8 fixed to the outer bottom surface of the frame 1, and this terminal 8. It is configured such that an input signal is applied to the piezoelectric vibrator 3 via a lead wire 7.

Since the piezoelectric speaker of the present invention is constructed as described above, the piezoelectric vibrator and the diaphragm can be bonded together in a short time with a simple construction, improving productivity. The bonded state of the adhesive can be confirmed through the holes during the assembly process, making it easy to distinguish between good and bad products.
It has many advantages, including the ability to measure improvements in quality, and is of great practical value.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view showing an embodiment of the piezoelectric speaker of the present invention, FIG. 2 is a top view of the diaphragm of the same speaker, and FIG. 3 is a sectional view thereof. 1...Frame, 2...Support protrusion, 3
...Piezoelectric vibrator, 4...Vibration plate, 5.
...Adhesive, 6...Small hole, 7...
・Lead wire, 8...terminal.

Claims (1)

[Scope of utility model registration request] In a piezoelectric speaker, a piezoelectric vibrator that vibrates in a flat plate is bonded to the top of the central part of a cone-shaped diaphragm whose periphery is connected to the periphery of a frame using an adhesive. A piezoelectric speaker with holes.