JPS5853827Y2 - speaker - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a speaker having a cone-shaped vibrating body formed of a honeycomb structure.

For example, some bass speakers have a diaphragm (cone) formed of a so-called honeycomb structure, which has a Nicum core as its core and skins attached to both sides.

In this case, aluminum is used for the honeycomb core, and GFRP (glass fiber reinforced plastic), mica, aluminum, etc. are used for the skin.

Since these materials have a large Young's modulus, the internal loss of the material itself is small, and therefore, compared to paper cones, split vibration occurs at a higher frequency and has the advantage of broadening the piston vibration band, which is shown as curve t1 in Figure 3. The drawback was that the peak of the response due to the split vibration was high.

In addition, in the case of a cone-shaped diaphragm made of general paper, it is possible to easily make the physical properties non-uniform by resin impregnation, paper making method, pressing method, etc., but...Nicum structure diaphragm Unlike this, because the physical property values are the same in each part, resonance is likely to occur strongly at a single frequency.

This idea was made in order to eliminate the drawbacks of the conventional ones as described above, and it has a ring shape on at least one side near the inner periphery of the cone-shaped diaphragm of the honeycomb structure to generate multiple frequencies of divided vibration. The aim is to provide a speaker with good output sound pressure frequency characteristics by attaching an auxiliary skin.

This invention will be explained in detail below based on illustrated embodiments.

Figures 1 and 2 show an embodiment of this invention.
1 has a honeycomb core 10 as the center core and skins 1 on both sides.
1. A cone-shaped diaphragm formed of a honeycomb structure with 11 attached, 2 a bobbin, 3 a voice coil, 4 a permanent magnet, 5 a pole piece, 6 a yoke, I an edge, and 8 a camp.

The diaphragm 1 has a flat ring-shaped auxiliary skin 12.12 attached to both sides near the inner circumference.

This auxiliary skin 12 is made of a material that has different physical properties from the skin 11 of the honeycomb structure, such as GFRP (in this case...
The two-cam structure is formed using materials other than GFRP for its skin, CFRP (carbon fiber reinforced plastic), etc.

When the auxiliary skins 12 made of a material having different physical properties from the skin 11 of the honeycomb structure are provided on both sides of the diaphragm 10 of the honeycomb structure, the output sound pressure frequency characteristic will be as shown by the curve t2 in FIG. The frequency at which the split vibration occurs is dispersed into two, and the peak is much lower than in the past.

As a result, the sound quality is sufficient even when the frequency of harmonic components matches the peak generation frequency, or when a high frequency output is produced for some reason even if the peak generation point is outside the normal usage range. will be obtained.

In the above embodiment, the auxiliary skin 12 was formed of one type of material with different physical properties from the skin 11 of the honeycomb structure.
As shown in FIGS. 5 and 5, it may be a composite body made of different materials, for example, aluminum sectors 12A and GF RP sectors 12B alternately arranged in a ring shape.

Further, as shown in FIGS. 6 and 7, fan-shaped bodies 12B1 and 12B2 of different thicknesses formed using the same material as the skin 11 of the honeycomb structure, such as GFRP, are arranged alternately to form a ring shape. Even if a material is used, it is still inferior to the case of using a different material, but it has the effect of improving characteristics compared to the conventional method.

Furthermore, the same effect can be obtained even if the auxiliary skin 12 is provided only on one side of the diaphragm 10.

In this case, it is desirable to provide it inside. As described above, according to this invention, split vibration can be achieved using a simple structure in which an auxiliary skin is attached to the inner circumferential portion of the cone-shaped diaphragm of the honeycomb structure in order to generate multiple split vibration frequencies. The output sound pressure frequency characteristics can be improved by distributing the divided vibration generation frequency and lowering its peak without losing the advantages of the honeycomb structure diaphragm which has a high generation frequency and a wide piston vibration band.

[Brief explanation of the drawing]

Figures 1 and 2 are a front view and a sectional view showing an embodiment of the speaker according to this invention, Figure 3 is a diagram of the output sound pressure frequency characteristics of the speaker, and Figures 4 and 5 are of the auxiliary skin. 6 and 7 are a plan view and a side view showing another example of the auxiliary skin. FIGS. 6 and 7 are a plan view and a side view showing another example of the auxiliary skin. 1... Cone-shaped diaphragm, 2... Bobbin, 3... Whisker coil, 4... Permanent magnet, 5... Pole piece, 5... Yoke, 7... Engine, 8... Cap,
10...Honeycomb core, 11...Skin, 12...Auxiliary skin. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] (1) In a speaker in which a cone-shaped diaphragm 1 is formed of a honeycomb core 10 and skins 11 are attached to both sides of the honeycomb core 10, vibration is divided on at least one side near the inner circumference of the diaphragm 1. A speaker characterized in that a ring-shaped auxiliary skin 12 is attached to generate a plurality of frequencies. (2) The speaker according to claim 1, wherein the ring-shaped auxiliary skin 12 is formed to have different physical properties from the skin 11 of the nicum structure.