JPS6035345Y2 - omnidirectional speaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cone-shaped omnidirectional speaker.

Conventionally, such omnidirectional speakers include a cone-shaped speaker mounted face down in a cabinet.

However, even if an attempt is made to improve the reproduction ability of this speaker for medium and high tones, it is not possible to attach a cone-shaped diaphragm for high tones to the center of the speaker, unlike a general cone-shaped speaker.

For this reason, it has been considered to attach metal foil or the like to the cone-shaped diaphragm, but this may increase the weight or cause abnormal noise such as chattering between the main cone-shaped diaphragm and the metal foil. This may occur.

The present invention has been made in view of the above-mentioned points, and its purpose is to provide an omnidirectional speaker that achieves a wide band without causing the above-mentioned problems.

The omnidirectional speaker according to the present invention, which was made to achieve this objective distantly, has a treble diaphragm arranged concentrically on the outside of a main cone-shaped diaphragm, and the center part of the diaphragm is fixed to the voice coil. It is characterized by:

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows an omnidirectional speaker according to the present invention, and 1 in the figure.
is a back plate integrated with the center pole 1a, 2 is a magnet, and 3 is a top plate, and these members create a magnetic gap G between the center pole 1a and the top plate 3.
A magnetic circuit is formed.

Reference numeral 4 denotes a frame fixed to the top plate 3 of the magnetic circuit, and includes three legs 4b extending obliquely from the fixed part 4a, and a ring-shaped part 4c interconnecting these three legs 4b. Three sound holes 4d are formed surrounded by the fixed portion 4a, the leg 4b, and the ring-shaped portion 4c.

Reference numeral 5 denotes a main cone-shaped diaphragm for low and medium sounds, the open end of which is attached to the ring-shaped portion 4c of the frame 4 via an edge 6, and a bobbin 7 is fixed to the other end.

A voice coil 8 is wound around the bobbin 7, and is movably arranged within the magnetic gap G.

Reference numeral 9 denotes a cone-shaped diaphragm for high-pitched sounds made of aluminum foil or the like having a higher Young's modulus than that of the main cone-shaped diaphragm 5, and is arranged concentrically on the outside of the main cone-shaped diaphragm 5. is fixed to the bobbin 7.

Note that 10 is a damper placed between the frame 4 and the bobbin 7.

The speaker having the above-mentioned configuration is mounted upside down in the cabinet 12 via the gasket 11, so that the main cone-shaped diaphragm 5, the high-pitched cone-shaped diaphragm 9, Furthermore, the frame 4 comes to be located on the outside.

In the above-described configuration, the sound generated by the diaphragms 5 and 9 is emitted in a direction in which it is diffused from the diaphragm surface, so that an omnidirectional speaker is formed.

Assuming that the main cone-shaped diaphragm 5 for low-mid tones and the cone-shaped diaphragm 9 for treble have respective output sound pressure frequency characteristics as shown by broken lines a and b in FIG. 3, the speaker as a whole has , a broadband frequency characteristic as shown by solid line C, which is a composite of the characteristics of broken lines a and b, is obtained.

In the illustrated embodiment, a common voice coil 8 is used for the main cone-shaped diaphragm 5 and the high-pitched cone-shaped diaphragm 9, but an independent voice coil is fixed to each diaphragm. It's okay.

As mentioned above, the present invention has a cone-shaped diaphragm for high-pitched sounds arranged concentrically on the outside of the main cone-shaped diaphragm, and its center is fixed to the voice coil, so its structure is similar to that of a normal speaker. Almost the same, it is easy to assemble, and since no metal foil is pasted on the cone diaphragm, it is possible to obtain an omnidirectional speaker that has a wide band frequency characteristic that does not generate abnormal sounds such as chattering.

[Brief explanation of the drawing]

FIG. 1 is a side view showing half of the omnidirectional speaker according to the present invention in cross section, FIG. 2 is a front view of the speaker shown in FIG. 1, and FIG. 3 is a graph showing the output sound pressure frequency characteristics. 5...Main cone-shaped diaphragm, 8...Voice coil, 9...Cone-shaped diaphragm for high-pitched sounds.

Claims (1)

[Scope of utility model registration request] In an omnidirectional speaker in which a cone-shaped speaker is mounted face down in a cabinet, a cone-shaped diaphragm for high-pitched sounds is placed concentrically on the outside of the main cone-shaped diaphragm, and its center is fixed to the voice coil. Features omnidirectional speakers.