Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPS6278996 [0001] FIELD OF THE INVENTION The present invention relates to a speaker horn incorporated in an electroacoustic transducer. A structure as shown in Japanese Patent Publication No. 58-3436 has been proposed for the purpose of making constant and flatten the sound pressure characteristic pattern in the conventional technology-oriented office. In addition, there are pie radials, mantles, twin vessels, CD horns and so on. Problems to be Solved by the Invention The shapes of these horns have a drawback that it is difficult to obtain a constant sound pressure characteristic pattern in the pointing station because the side walls of the horn are formed by a plurality of functions. The present invention aims at making the sound pressure directional characteristic pattern in the directional point constant 7 and obtaining a wider directional angle. SUMMARY OF THE INVENTION In order to solve the above problems, the present invention satisfies the above object by setting the tangent angle of the side wall curve of the throat of the horn (half apex angle C) to 1/2 of the target pointing angle. It is assumed that (l + αχ). Here, α0 is the dimension of the throat, αχ is the dimension of the cross section of the distance χ from the throat, and α = wide is the coefficient. The sound pressure directivity pattern in the pointing station largely depends on the side wall function, and a horn having a plurality of functions combined has a change in the characteristic pattern at a frequency determined by its shape and distance, and is less stable. In the Bessel function, the side wall becomes straight with n = 4, the directivity angle becomes narrow at a frequency of α: =: 450 / 2θ, and peaks and valleys occur in the sound pressure directivity characteristic pattern in the high region. If the Bessel function approaches n → flash, it approaches an exponential function and the directivity angle changes with frequency and does not become constant. Among them, when n = 4 of the Bessel function, the change of the directivity angle in the frequency is the smallest, and these make the tangent angle of the opening end approximately the same as the target directivity angle-(90 By setting it as −), the directivity pattern can be stabilized. The target pointing angle is substantially 02-05-2019 1 determined by the tangent angle of the horn. The sound pressure directivity characteristic pattern of the horn having the side wall determined by αχ = αa (1 + αχ) can obtain a constant sound pressure directivity characteristic pattern at a wide directivity angle with a substantially flat and small deviation. Embodiment 1: The side wall curve of the present invention is shown in FIG. 1. The objective directivity angle 2θ6 having a flat sound pressure characteristic is paired 1-1 with θ1 1/2 (2θo), θ2 2θ0 (where 2θO is 90). A curve connecting the value of α of χrχn is taken as αχ = αο (t + αχ) 4 as it exceeds 90 °). Here, the width of α is larger than the coefficient. The constant is set so as to connect α n at 79 o'clock, and it is set as a function. As shown in FIG. 2, the sound pressure directivity characteristic pattern obtained by the horn obtained in the above manner is such that the deviation in each frequency within the target directivity angle is small and constant. As a comparison with the prior art, FIG. 3 shows the sidewall shape of αχ = a * (1 + αχ) and its sound pressure directivity characteristic pattern in FIG. The sound pressure deviation at each frequency is large and the target directivity angle is narrowed. FIG. 6 shows the side wall shape in which a plurality of functions are spliced together and the directivity characteristic pattern thereof. Although the sound pressure deviation of each frequency decreases near the target pointing angle, there is a sound pressure deviation in the target pointing place. FIG. 8 shows the sidewall shape of the Hoy of αχ = ao (1 + αχ) 8 and the directivity characteristic pattern thereof. The directivity characteristic pattern approximates to an exponential function, and the directivity angle becomes narrower as the frequency becomes higher. From the above, according to the conditions of the present invention, the speaker horn can obtain a wider directivity angle at a constant level of the sound pressure directivity characteristic pattern in the pointing station. Further, the target pointing angle is freely set, and the pattern shape of the sound pressure directivity characteristic is changed according to the memo horn shape obtained from the conditional expression of the present invention, but the same wide pointing angle as described above can be obtained. According to the present invention, the sound pressure deviation at each frequency within the target directivity angle can be reduced, and uniform sound pressure characteristics can be supplied to the pointing station. [0002] Brief description of the drawings [0003] FIG. 1 is a view showing a side wall curve of the present invention, and FIG. 2 shows a sound pressure directivity characteristic pattern. 02-05-2019 2 FIGS. 3 to 8 are side wall curves of the horn for explaining the present invention in detail and a directional characteristic pattern thereof. Fang 5 Fig. 1 Fig. 1 Fig. 2 Fig. 4 KH 7 Fig. 4 Fig. 4 90 ° 02-05-2019 3
© Copyright 2021 DropDoc