close

Вход

Забыли?

вход по аккаунту

?

JPS5783995

код для вставкиСкачать
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 JPS5783995
Description 1, title of the invention
????
3. Detailed Description of the Invention The present invention relates to a loudspeaker using a
flat diaphragm, and an elliptical coupling cone straddling a nodal circle at a first resonance
frequency and a second resonance frequency at a second resonance frequency of the flat
diaphragm. Is used to drive the flat diaphragm to cancel the resonance mode up to the second
resonance so as to obtain a flat sound pressure frequency characteristic over a wide band. The
conventional loudspeaker of this type is configured as shown in FIG. That is, the frame 6 is
coupled to the magnetic circuit 5 formed by laminating the ring-shaped magnet 3 and the ringshaped upper plate 4 on the plate 2 having the center pole 1 and Edge 9f of the peripheral
portion of flat plate diaphragm 8 is bonded, and coupling cone 1 ░ is joined to the point of the
first resonance frequency of the lower surface of flat plate diaphragm 8 and the central portion
of this coupling cone 1o The voice coil 11 is coupled, the middle portion of the voice coil 11 is
held by Dan, <?12, and the lower portion of the voice coil 11 is fitted into the magnetic gap 13
of the magnetic circuit 6 without eccentricity. The The upper end of the coupling cone 1o has a
diameter of about 68% of the diameter of the disk-shaped flat plate diaphragm 8, EndPage: 1 this
diameter is the diameter of the nodal circle at the first resonant frequency of the flat plate
diaphragm 8. It is the same size as Since the portion corresponding to the node of the primary
resonance frequency of the flat plate diaphragm 8 is thus driven by the coupling cone 1o
obtained by coupling the voice coil 11, the sound pressure frequency characteristic is as shown
by the solid line in FIG. 1. Compared with a speaker driving a non-node part of the first
resonance frequency shown by a broken line, the peak and dip due to the first resonance
disappear but the generation of the peak and dip due to the next second resonance frequency
11-05-2019
1
can not be blocked. He said that he could not get flat sound pressure frequency characteristics.
The present invention eliminates the above-mentioned conventional drawbacks. An embodiment
of the present invention will be described below with reference to FIGS. 3 and 4 of the drawings.
First, in FIG. 3, reference numeral 14 denotes a magnetic circuit, and the magnetic circuit 14 is
constituted by a plate 16 having a center pole 16, a ring-shaped magnet 17, and a ring-shaped
upper plate 18. A flame 19 is coupled to the magnetic circuit 14, and an edge 22 of a flat
diaphragm 21 is coupled to the periphery of the frame 190 by bonding or the like along with a
gasket 20. The flat diaphragm 21 is configured by sticking a skin material to a honeycomb core
or is formed in a disc shape by a foamed resin plate.
A coupling cone 23 made of a light metal resin film and paper 1 foamed resin is coupled to the
lower surface of such a flat diaphragm 21. The coupling mt'j of the coupling cone 23 to the flat
plate diaphragm 21 is formed in an elliptical shape, and the major axis of the ellipse is
determined by the diameter of the nodal circle or the second resonant frequency by the first
resonant frequency The minor diameter of the ellipse is configured to be equal to the large
diameter nodal diameter, and to correspond to the small diameter nodal diameter at the second
resonance frequency or the nodal diameter at the first resonance frequency. The nodal diameter
according to the first resonance frequency is o, esD, 9 of the diameter D1 of the flat plate
diaphragm 21, and the nodal diameter of the large diameter according to the second resonance
frequency is 0.8 D, nodal diameter of the same diameter The circle diameter is 0.58 Dl. The
central portion of the coupling cone 23 is circular, the voice coil 24 is coupled to the central
portion, the middle portion of the voice coil 24 is held by the damper 26, and the lower portion
of the voice coil 24 is the magnetic The magnetic gap 26 of the circuit 14 is fitted without
eccentricity. FIG. 4 shows the sound pressure frequency characteristics of a speaker configured
as described above, wherein the diameter D1 of the flat diaphragm 21 is 25 mm, the major
diameter of the aluminum-made coupling cone 23 is 17 Cm, and the minor diameter is 14.5 cm.
Shown in. In FIG. 4, the flat diaphragm 21 is node-driven even though the joint circle at the first
resonance frequency and the joint circle at the second resonance frequency are incomplete, and
the peak and dip at the first resonance, Peaks and dissonations due to the second resonance are
suppressed, and a flat sound pressure frequency characteristic can be obtained over a wide band.
Since the speaker according to the present invention is configured as described above, the nodal
circle drive due to the primary and secondary resonance frequencies can be realized while being
incomplete, and the sound pressure frequency characteristics at the primary and secondary
resonances can be realized. It is a dog of industrial value, which has the advantages of being able
to suppress the occurrence of peaks and dips, having a -F picture characteristic over a wide band,
enabling high fidelity reproduction, and the like.
4. Brief description of the drawings. FIG. 1 is a half sectional view of a conventional speaker, FIG.
2 is the same sound pressure frequency characteristic diagram, and FIG. 3 is a sectional view
11-05-2019
2
showing an embodiment of the speaker of the present invention. It is a sound pressure
frequency-characteristics figure of a speaker. 14 иииии Magnetic circuit, 19 и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и flat plate, 22 и и и и и и и и и и и и и и и и и coupling cone, 24
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Magnetic cap. Name of agent Attorney Nakao Toshio
et al. 1 other EndPage: 2 End Hori-EndPage: ?
11-05-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
10 Кб
Теги
jps5783995
1/--страниц
Пожаловаться на содержимое документа