JPS58139592A - Cabinet for acoustic device - Google Patents

Abstract

PURPOSE:To eliminate howling of the titled cabinet, by using a mixture of single crystal fibers of potassium titanate and synthetic resin to produce the cabinet. CONSTITUTION:The single crystal fibers of potassium titanate are mixed into a polypropylene solution, and this mixture is formed into a desired uniform shape by injection molding. Thus no leakage of air is produced for a cabinet with a high Young's modulus owing to the mixture of single crystal fibers of potassium titanate. Furthermore the Q of the cabinet can be reduced due to a large internal loss of polypropylene. This can improve the sound shielding performance of the cabinet and prevent the generation of resonance.

Description

[Detailed description of the invention] This invention (c), and j? d Speaker cabinet, etc. σ) Gyosho equipment cabinet σ) Regarding improvements.

Speaker cabinet v: 1 As shown in Figure 1, install the craftsmanship cabinet before making the hole and making the hole. Person 3. Bottom plate 4. The back is a box made up of T15.

Conventionally, each of the above 61, 2, 3, 4. , 5, natural wood board or use t-) t', due to depletion of natural bone w @I Nutte High 1 song, there is - γ (1ri σ" high-class speaker cab A)) only 1 was employed1
, here, here + II (Hiiragi and 4ty (Benia) father, no -- 1-Ikulhod or speaker cabinet (; 1 and 1. (7) are used).

Conventional tree 'n ten body σ] information R? :1″, +H+
Young's modulus is relatively small.

That is, the sound insulation characteristics of the mid-bass sound insulation characteristic of the cabinet H are not good because the surface density (density x thickness) of the cabinet H is small (about +5' = 0.5 IM).

Evening and high-pitched sound insulation'】Mountain-mounted cabinet 11
The body (/1 has a very small ten f Meyang's modulus, but the history π, the woody ten body σ" + A'ilI/l resonance sharp anti-Q
KA: (0-f + 11 to ratio 19 target ratio) 4 waves transmitted from the frame of the speaker, NU 1 Air inside the cabinet L:/] Due to the vibration caused by the expansion, resonance shakushu, This overlaps with the above-mentioned poor sound insulation properties, causing the so-called box 11 series σ), which is superimposed on the sound from the speaker, and the auditory sense is affected.'H1;, #-;4. I had a lot of shortcomings.

I-san, sheet metal - 11 method cutting [, as well as the assembly process 1-2, air leakage in the assembly part of the literature 4v (
I-B/] Il- to ensure a tight seal required exactly 8 butts, and a large amount of adhesive was required, which was extremely troublesome.

Therefore, in the present invention, we have developed a thermosetting resin (plastic flexure for pregnancy heat) in which monocrystalline fibers of potassium titanate are mixed into a thermosetting resin.
This is a molded gi\hinenoto, and the details will be explained below in Example R.

〔Example〕

Titanic acid horn of π15wt9 in hollybrobylene bath melt
Riuno・σ) Small Crystal Birch Old Man 1 (Japanese W Thread "Length" 0 μm to 211 μm.

Fiber diameter: 0.2 to 0.5 μm) Mixed with a trowel or pellet to uniformly disperse and stir the crystal fibers. Create.

And, as the Beret K I Emperor AA fee, Inji,
I: Molded into the shape shown in FIG. 2 (14).

In the 2nd ㅅ, there is an opening on the rear surface at 21 r121 +)☆i1
This is the hole to install the speaker e++y in the cabinet 21a.
, I can do things openly. 22 is the rear machine to which the 11 rear openings are to be closed, preferably the same as above (II')
".

At about 18 to 7"l, I formed a matching sound board shape (σ).

In this way, the speaker gear vignette is densely IN' or 12 is approximately 2.49 times -C' as that of paulownia wood, which is mainly made of wood, and the Young's modulus is the elasticity of the potassium titanate /1i crystal fiber itself. Since the ratio is extremely large (28 + White 1 () - 2), it is possible to obtain the value of 5, ] In addition, the resonance sharpness Q was about 15, which was half that of the smallest wood-based material. ) is considered to be λ.The reason is that the density is thicker, so the surface density is 1 less dense, and the sound insulation properties of mid- and low-frequency sounds are improved. This dramatically improves the sound insulation properties in mid-to-high frequencies.

Since the resonant casting father Q is extremely small, the cabinet plate σ
This suppresses the resonance and works together with the improvement of the Watai characteristic J) to reduce the level of so-called box noise, making it possible to suppress the negative impact on the auditory sense.

1! However, the key vignetting of this invention can be integrally molded with the other five sides (front plate, two side plates, top plate, and bottom plate) except for the rear and W sides by injection molding, so there is no need to worry about the troubles of the conventional method. Assembly work is not required, and there is no air leakage at the mating parts of each machine.

The shape of the cabinet can be freely controlled by the above-mentioned molding, and reinforcing ribs and the like can be integrally molded on the inner surface.

The rear plate may be made of a homogeneous material [7, and other materials may be used depending on the purpose, since the rear plate is not suitable for molders.

Then, the rear plate is fixed using conventional mounting means such as hissing, adhesive, etc. The front plate (baffle plate) is also separate σ depending on the purpose.
] From Kiri Oni 1, f tends to be small, so by selecting the proportion, it is possible to obtain a cabinet with desired characteristics suitable for the purpose.

Furthermore, in the above Examples, in 1.7, thermoplastic resin and Example P using Flobilenke were mentioned, and in addition, polyethylene, polypropylene-polyethylene copolymer,
Heat of ABS resin etc. 1jlQ) Outside 11h, thermosetting resin such as epoxy resin, urea resin etc. It is possible to use a so-called compressed song shape in which a resin pellet and a single crystal wire Mlk of potassium titanate are mixed and heated in a mold W.

As explained above, this invention is a cabinet made of FJY resin mixed with monocrystalline fibers of potassium titanate. 'j11..+, improvement of ze1, suppression of resonance σ) suppression effect Sung 11rl expansion, σ), and there is no production method in history with IW + flight-(some σ). Ki 4 Vignette or Thick 1j + and H Medium Takumi I i 4 line cost reduction ff Th - given etc., practical soil extremely I 1 effect'f?
Part 21 is a partially cut-away perspective view of the conventional gear A Bi-nod. Part 21 is a partially cut-away perspective view of this development .

Claims (2)

[Claims] (1) A gear rack for g-sound equipment formed by molding a synthetic resin mixed with CIL crystal fibers of potassium titanate. (2) The cabinet for cross-body equipment as described in range 1 above, characterized in that it is made of synthetic resin or polypropylene.