JPS5853834Y2 - treble speaker - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high-pitched speaker used for generating high-pitched sounds in radio cassettes, for example.

Conventionally, this type of high-pitched speaker consists of a piezoelectric element such as a ceramic diaphragm for generating high-pitched sounds in the speaker body, a lead-based damping plate that dampens the vibration of the piezoelectric element, and a terminal plate that houses and supports these elements in the speaker body. has been done.

However, the above-mentioned brake plate uses lead material to suppress abnormal high-pitched sounds and noises due to the vibration absorption effect of the lead white body, but even though the brake plate is made of lead, it has a certain natural vibration. Depending on the frequency of the piezoelectric element, the periods may be the same, and in that case, the braking plate and the piezoelectric element resonate, and this resonance phenomenon causes a drop in high-pitched sound output, noise, etc., and unstable high-pitched sound characteristics. It became.

Therefore, this idea aims to provide a high-pitched speaker with stable high-pitched sound output and no noise by using a damping member whose density changes with vibration to prevent the resonance phenomenon between the piezoelectric element and the damping member. be.

An embodiment of this invention will be described below in detail based on the drawings.

In the treble speaker 1 shown in the drawing, reference numeral 2 denotes a speaker frame made of synthetic resin, which has a circular recessed hole 3 on the lower surface, and the upper part communicates with the inner diameter of the recessed hole 3. A tapered hole 4 is provided with an enlarged diameter, and a flange 5 is provided protruding from the outer periphery of the side surface.

A piezoelectric element 6 is housed within the piezoelectric ceramic plate and connects lead wires 7 and 8.

This piezoelectric element 6 is fitted into the recessed hole 3 of the speaker frame 2, so that the outer peripheral portion 9 of the upper surface is brought into contact with the outer peripheral portion 10 of the bottom surface of the recessed hole 3.

11 is a braking member for braking the piezoelectric element 6,
Vertical direction (vibration direction of piezoelectric element 6) with soft synthetic resin material
A bellows 12 that can be expanded and contracted is formed, and a colloidal liquid 13 whose density can be changed is sealed inside the bellows 12.

The upper surface of the braking member 11 is joined to the center of the lower surface of the piezoelectric element 6.

14 is a terminal plate, which has terminals 15 and 16 and is fitted into the lower end of the recessed hole 3 of the speaker frame 2, and is inserted into the braking member 1.
The speaker frame 2 is supported by pressure contact with the lower end of the speaker frame 1, and is also fixed to the speaker frame 2.

Lead wires 7.8 are connected to terminals 15 and 16, respectively.

The high-pitched speaker 1 configured as described above has terminals 15 and 16.
When a voltage is applied to cause the piezoelectric element 6 to vibrate at a high frequency and generate a high-pitched sound, the braking member 11 connected to the piezoelectric element 6 is subjected to a vibration effect; However, due to this variation, the density of the internal colloidal liquid 13 changes and the natural frequency changes, so a resonance state with the piezoelectric element 6 does not occur at all.

Therefore, the piezoelectric element 6 does not cause a drop in high-pitched sound output or generate noise, and can always provide stable high-pitched sound characteristics.

In the above embodiment, the bellows of the braking member is made of soft synthetic resin, but rubber material, metal material, etc. may also be used.

Furthermore, instead of the colloidal liquid, any medium may be sealed inside the bellows 12 as long as it is a medium whose density can change, such as air.

Furthermore, the piezoelectric element is not limited to the piezoelectric ceramic plate, and other materials may be used.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view. Figure 2 is a longitudinal sectional view. FIG. 3 is an exploded perspective view. 2... Speaker frame, 6... Piezoelectric element, 11.
... Braking member, 12 ... Bellows, 13 ... Colloidal liquid, 14 ... Terminal board.

Claims (1)

[Scope of utility model registration request] A high-pitched speaker having a speaker frame equipped with a piezoelectric element for generating high-pitched sound, a braking member for braking the piezoelectric element, and a terminal plate supporting these, the braking member being a bellows that can be expanded and contracted in the vibration direction of the piezoelectric element. A high-pitched speaker formed into a shape with a medium of variable density sealed inside.