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JPS5317718

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DESCRIPTION JPS5317718
Description ? Name of Invention
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3. Detailed Description of the Invention The present invention aims to improve the directivity of a
loudspeaker. In order to improve the directivity of the speaker (to be nondirectional)
conventionally, as shown in FIG. 1, a baffle plate 1 having a circular hole 2 is placed on the front
of the speaker to I was improving the sex. In the figure, 3 is a magnet, 4 is a plate, 5 is a damper,
6 is a diaphragm, 7 is an edge, 8 is a frame, 9 is a gasket, and 10 is a dust cap. By the way,
according to the above method, the efficiency of sound propagation is reduced over the entire
frequency band, so that the circular hole 2 is shown as a dotted line in the figure in the vertical
direction to improve the directivity characteristics in the vertical direction. By reducing the
length of the holes, the decrease in efficiency was reduced. Although there is a conventional
example in which a hole is made in the dust cap 10, this hole is merely an air vent and does not
improve the directivity. That is, the directivity characteristic of the diaphragm 6 is determined by
the diameter of the entire cone. EndPage: The purpose of the present invention is to improve the
directivity characteristics determined by the aperture of the cone without reducing the efficiency
of sound propagation. The opening of the main diaphragm is covered with an auxiliary
diaphragm that hardly vibrates, and the auxiliary diaphragm is provided with a hole of an
appropriate size. The embodiment will be described below with reference to the drawings. In FIG.
2, 11 is a speaker base including a magnet, a plate, etc., 12 is a frame, 18 is a gasket, 4 is a
damper, and 15 is a dust cap. The main diaphragm 16 is formed in a cone shape, and the
opening at the front is covered by a sub diaphragm 17 having an aperture 18 at one center. The
0 sub diaphragm 17 is integral with the main diaphragm 16 at low frequencies. Properties such
as vibration that causes little vibration at high sound, that is, light and rigid, and paper with a
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suitable internal loss, cloth, thin metal plate, plastic filament (eg Mylar film), etc. It is formed of a
material. The outer periphery of the auxiliary diaphragm 17 is connected to the periphery of the
opening of the main diaphragm 16, and the edge 19 is continued. The low frequency sound is
radiated from the auxiliary diaphragm 17, and the high sound is emitted from the main
diaphragm 16 and then gathers in the aperture 18 of the auxiliary diaphragm 17. Therefore, the
directivity of the high sound is determined by the effective aperture of the aperture 8. When the
sub diaphragm 17 vibrates with high sound, it approaches the directivity characteristic
determined by the aperture of the main diaphragm 16. That is, the on-speaker sound pressure
increases by the radiation due to the vibration of the auxiliary diaphragm 17, and the sound
pressure in any direction other than the on-axis does not increase on the on-axis.
In order to prevent this, according to the present invention, a corrugation 20 is provided around
the aperture 18 of the auxiliary diaphragm 17 to increase the internal loss and compliance to
prevent the division vibration of the high sound from occurring and the directivity characteristic
is It prevents it from deteriorating. It is desirable for the sub-diaphragm 17 to absorb the high
frequency vibration of the main diaphragm 16 at its inner surface and transmit the highfrequency vibration of the main diaphragm 16 for the reason described above. In order to absorb
this, a sound absorbing material may be provided on the front surface of the auxiliary diaphragm
17 to absorb treble vibration. In addition, there is also a method of connecting the sub
diaphragm 17 and the main diaphragm 16 with a shock absorbing material (edge) to prevent the
vibration in the high range of the main diaphragm 16 from directly propagating to the sub
diaphragm 17. In the actual design, the internal loss of the auxiliary diaphragm 17, the Young's
modulus, the material of the connecting portion with the main diaphragm, the vibration
characteristic of the main diaphragm, and all conditions are considered appropriately. The
aperture of the aperture 18 of the auxiliary diaphragm 17 is a document (LEOlL. BERANEK;
ACOUSTICMESUREMENTS, 1949, pp. 681-684) is determined by calculation from the following
equation. Note: Q (f + is the directivity coefficient when the frequency is f, ? is the Bessel
function, a is the radius of the diaphragm, K-2?f / C wavelength. ???????????? As
it becomes inside C / 2?a f. -['Is Qzl, and at frequencies above that Q :: ("-) 2 characteristic is
shown, and the wavelength is smaller than the diameter of the aperture] 8 It is assumed that
there is no effect of the sub diaphragm Ru. Therefore, the aperture 18 of the present invention is
required to be equal to about ? <C / ft (wavelength ? shown by the formula, where fH is the
upper limit of the high frequency region having the effect of improving the directivity. The
corrugation 20 of the auxiliary diaphragm 17 is also effective in reinforcing the auxiliary
diaphragm 17. In order to further increase the strength of the auxiliary diaphragm 17, it is
effective to form the auxiliary diaphragm 17 in a cone shape as shown in FIG. (A) is the case
where the top of the cone having the aperture 18 is inside the speaker, and (B) is the case where
it is outside the speaker. In the present invention, the decrease in the efficiency of the main
diaphragm 16 is only the increase in weight caused by the attachment of the auxiliary diaphragm
17, and its directivity characteristic is improved in the horizontal and vertical directions.
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Indicates The effect of the improvement is as follows. When the aperture 18 is around 50, 2 KHz
= ?5 KHz, (3 dB to 6 dB) / (difference between on axis and 30 ░) to (0, 5 dB to 3.5 dB) It was
confirmed that it improved to /) (difference between on axis and 80 ░).
EndPage: As described above, the speaker according to the present invention has an excellent
effect of improving its directivity over the entire range of treble and bass without reducing the
efficiency of sound propagation by providing the auxiliary diaphragm 17. .
4. Brief description of the drawings FIG. 1: A diagram showing a conventional speaker, (A) is a
side sectional view, (B) is a front view, FIG. 2: is a diagram showing a speaker of the present
invention, (A) is (B) is a front view FIG. 8: (a) (b) is a side sectional view 11 of another
embodiment of the speaker according to the present invention, 11: base, 12: frame 13, 13. и
Gasket и и и и и и и Damper, 15 и и и dust cap, 16 и и и main diaphragm, 17 и и и auxiliary diaphragm, 18 и и
и opening, 19 и и и edge. 20 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ?
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