JPS58124393A - Speaker device - Google Patents

Abstract

PURPOSE:To obtain a speaker device which can considerably improve the reproduction of low frequency sound, by forming a speaker cabinet having a large compliance. CONSTITUTION:In sealing a solution representing a negative shift in accordance with the Raoult's low in an enclosed cabinet to realize the coexistence of gas and liquid two phases and in keeping the pressure in the cabinet to 1atm., the pressure change caused by a diaphragm is absorbed with the phase change between the gas and liquid and the cabinet having a considerably high compliance is made. Thus, a speaker device which improves the reproduction of low frequency sound considerably is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker device, and an object of the present invention is to provide a speaker device that can configure a speaker cabinet with high compliance and dramatically improve bass reproduction.

Generally, the low frequency limit of a speaker device having a closed cabinet is determined mainly by the mass of the vibration system and the compliance of the cabinet. Cabinet compliance is a measure of the softness of the air inside the box, and corresponds to the reciprocal of the change in pressure inside the gear box as a result of volume changes due to vibration of the diaphragm. That is, V P where C is compliance, ■ is volume, and P is pressure.

Now, assuming an adiabatic change, in a gas, PVγ-4(K
is a constant and γ is the specific heat ratio), so P = 1 (atm), V = 1, and γ = 1 in air
．． By substituting 4, we get C,=-□-20.714 a1γ 1.4 Also, the coefficient of thermal expansion α of gas is as follows for an ideal gas. By the way, we realized gas-liquid two-phase 1F equilibrium in KiA, Hii, Soto,
Assuming that the pressure is maintained at one level, the pressure change caused by the vibration of the diaphragm is absorbed by the phase transformation of the gas and liquid, making it possible to create an extremely high compliance cavity. -The force and coefficient of thermal expansion are determined by the relationship between temperature and vapor pressure, unlike in the case of gases. In the case of one-component two-phase equilibrium, K
1. In order to maintain the internal L-toca at 1 atm, it is necessary to maintain the system at the boiling point of the component at all times, which requires precise temperature control. Increasing the number of components and creating a two-component, two-phase 'F-equilibrium' increases the degree of freedom, and even if the temperature changes slightly, the gas-liquid composition ratio changes, making it possible to keep the pressure constant, reducing accuracy. Even with temperature control, high compliance cavities can be stably achieved. Regarding the combination of components, it is necessary to select a combination that has the highest possible compliance and the lowest possible coefficient of thermal expansion. This is because the higher the coefficient of thermal expansion, the higher the pressure.
“In order to maintain a constant volume, a large volume change is a force, and a container with two-phase equilibrium must be made extremely flexible and capable of changing volume.However, in order to AM the 9th equation of the It was not known that combinations such as and were good for .

The present invention has been made in view of these requirements,
According to Raoult's law, a solution exhibiting a negative slip is sealed in a sealed cabinet with VC to realize a gas-liquid two-phase coexistence state, and is configured to balance the pressure inside and outside the cabinet.

In an ideal solution, the natural pressure follows Raoult's law.

When A mol of the first component and B mol of the second component are mixed, the vapor pressure of each is Xk, XR is the cell fraction of each liquid, and i and r'4 are the vapor pressures of each pure liquid. . Also, the total pressure is Pop-P,
+pB=xi4+a-xi) Taku
t2) Therefore, the mole fraction in the gas phase is the number of moles of A and B in the liquid phase and gas phase, respectively.
Assuming L, BL, Ay, By, (5)
1 Eliminate AL, AV, BL from equation (6) and return A
V-BVXA/xB (8) The total volume (2) is expressed by the sum of the volumes of each gas phase, ignoring the volume of the liquid phase.

f3) By substituting equations (7) and (4) into equations (7) and (8), and further substituting into equation (9), the relationship among P, V, T (temperature), and X (composition) can be found.

Antoine's formula 1 (%) is used to calculate roots and bars. If we find −--- and − from equation (9), we get 2d.
The relationship between compliance and thermal expansion coefficient in P cLT phase equilibrium can be seen. Specifically, Figure A shows the results of calculations performed for various solutions assuming that Raoult's law is followed.

Next, consider a case where there is a deviation from Raoult's law. For simplicity, the following equation is assumed instead of equation (1) as a positive shift.

p -Hp' p-F■]01 A A, B B Total pressure P. is po= pA×PB=Ri+ r −1”,
Solving for αsXk, x”@=i −x”;

(141xB-1-xAQQ Substituting equations (auxiliary to Q6) into equations (7) and (8), and further (
9) Substitute into the equation to find P, V, T, in case of positive deviation.
Understand the relationship between X.

From this, the relationship between compliance and thermal expansion coefficient is determined by the same division as when following Raoult's law, and Figure B is obtained.

Next, consider the case where there is a negative shift. Assume the following equation instead of equation (1).

P-X■2P0. PB=(1-X:)2P3
QnoA AA Po= PA0PB=X'A2PX + (1-Xi)2
Pi 08) Solving for Xk also gives χ721-X fire
Figure C was obtained by calculating the relationship between compliance and thermal expansion coefficient in the case of negative deviation using the same method as in F. What can be seen from the figure is: 1. The relationship between compliance and thermal expansion coefficient is a linear relationship, and the 8M expansion coefficient where compliance is large is also large.

Moreover, when the coefficient of thermal expansion is ○, the compliance is equal to the value of air, which is consistent with the case of only the gas phase.

2. If the properties as a solution are the same, that is, the degree of deviation from Raoult's law is the same, then they will almost be on the same 1M line regardless of the composition or components.

3 If the two compositions are the same, the lower the temperature, the higher the compliance.

4. In order to meet the above-mentioned requirements for high compliance cavities and throats, it is preferable to use a combination of components that exhibit a negative deviation from Raoult's law.

The relationship between compliance and thermal expansion coefficient when considering the ideal solution and the deviation from it was shown above using a simple model, but in general, the deviation from the ideal solution can be calculated using the activity a determined by the concentration. The slope of the line is determined by the activity of each system. Therefore, in general, multi-component systems of three or more components can be considered in exactly the same way as two-component systems. Therefore, α in equation (24) increases as the negative deviation becomes larger, which is advantageous for the /· compliance cabinet.

As described in detail below, the present invention clarifies the influence of the most important solution properties on the relationship between compliance and thermal expansion coefficient in speaker cabinets that utilize multi-component two-phase equilibrium. , it is possible to provide a combination of two components with high compliance and a small coefficient of thermal expansion.

[Brief explanation of the drawing]

The figure is a diagram showing the relationship between compliance and thermal expansion coefficient of the speaker device of the present invention.

Claims (1)

[Claims] (1) Installing the speaker in a sealed cabinet,
A solution consisting of at least two components is sealed inside the cabinet to realize a gas-liquid two-phase coexistence state, and the pressure inside and outside of the Gearby Soto is balanced. A speaker device characterized in that it is configured to indicate a load deviation from a law. (b)) The speaker according to claim 1, wherein the sealed solution exhibits a gas-liquid two-phase state in a temperature range of 20°C to 20°C or a part thereof under 1 atm. Device.