JPS6025118Y2 - sound device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sounding device used as a buzzer for an alarm clock, etc.

BACKGROUND ART Conventionally, a buzzer horn has an opening formed in the center of its upper surface, and a diaphragm is vibrated by the excitation of a coil, and the sound is amplified and produced by the hollow effect of the horn.

However, the horn resonates well with a certain resonant frequency that enters the excitation coil, but when the resonant frequency of the signal that enters this coil changes, the horn's resonance sharpness suddenly decreases and the output deteriorates. was there.

Therefore, by changing the output characteristics and frequency characteristics, the present invention increases the range of the resonant frequency of the horn and improves its ability to follow the frequency fluctuations of the excitation coil, thereby eliminating the rapid decline in the resonance sharpness of the conventional technology. The purpose is to prevent

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a yoke 2 is press-fitted into the lower end opening of a horn 1, and an adjustment screw 3 is screwed into the center of the yoke. A ring-shaped coil 4 and a magnet 5 are arranged on the upper surface of the yoke with the adjustment screw as the center.

Then, the diaphragm 6 is attracted to the upper surface of the magnet 5, and the adjustment screw 3
A predetermined gap is provided between the upper end surface and the upper end surface.

A mass 7 is adhered to the center of the upper surface of the diaphragm 6.

8 is a printed circuit board.

By the way, a partition wall 1a is provided at the upper part of the horn 1 either integrally or fixedly as shown in the figure.

The partition wall 1a partitions the inside of the horn 1, and provides an open chamber 9 on the upper end opening side of the horn and a resonance chamber 10 on the inside.

At the center of the partition wall 1a, as shown in the first and second figures, a cylindrical body 11 is provided to protrude toward the open chamber 9 side.

The lower end opening of the cylindrical body 11 communicates with the resonance chamber 10, and may protrude slightly into the resonance chamber.

The length Ll of the cylindrical body 11 is not limited to the illustrated example, but is not longer than the length (length and depth) L2 of the open chamber 9.

If the cylindrical body 11 is made thin and elastically deformable, the hollow effect of the cylindrical body can be further enhanced.

In the present invention having the above configuration, the diaphragm 6 is excited by the resonant frequency of the coil, and the sound is amplified by the resonance chamber 10 of the horn 1 and the cavity effect of the cylindrical body 11.

Note that depending on the length Ll of the cylindrical body 11, the cavity effect of the open chamber 9 is added to the cavity effect described above.

Therefore, even if the resonance frequency of the signal input to the coil 4 fluctuates, the resonant sharpness of the horn 1 does not drop sharply due to the resonance chamber 10 and the cylindrical body 11, and the followability is wide.

Therefore, it has the effect that it can be applied depending on the conditions, such as when the frequency fluctuation of the input electrical signal supplied to the coil is large, or when you want to output a wide range of frequencies from low to high according to your preference.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. 1...Horn, 1a...Partition wall, 9.
...Opening chamber, 10... Resonance chamber, 11...
...Cylinder.

Claims (2)

[Scope of utility model registration request] (1) The inside of the horn is divided by a partition wall into an open chamber on the open end side and a resonance chamber on the inner side, and a cylindrical body is provided protruding from the above-mentioned open chamber side of this partition wall, and the lower end opening of this cylindrical body is A sounding device characterized by communicating with a resonance chamber. (2) Utility Model Registration Claim 1: The sound generating device characterized in that the cylindrical body is elastically deformable.