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JPS54181924

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DESCRIPTION JPS54181924
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the basic
structure of a cone-shaped speaker, FIG. 2 is a cross-sectional view of a conventional flat plate
speaker, and FIG. 3 shows an embodiment of the flat plate speaker according to the present
invention. FIG. 11 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 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 voice
coil, 17 и и и .... center pole, 18 ...... permanent magnet, 19 ...... gasket, 20 ...... support member. In
the drawings, the same reference numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a flat panel speaker using
a flat diaphragm as a diaphragm. Fig. 1 shows the basic structure of a cone speaker. In the figure,
1 is a cone-shaped diaphragm, 2 is a damper, 3 is an edge, 4 is a frame, 5 is a yoke forming a
magnetic circuit, 6 is an input electrical signal but a chair coil, 7 is a magnetic circuit. The center
pole 8 is a permanent magnet and 9 # i is a gasket for pressing the edge 3 to the frame 4. In
order to give linearity to the front le's turtle- ? -l-n / ha's dun and the mother-2Fi vibration
system, the -t 1 m ? is attached to the chair coil 6. The edge 3 plays the same role as the Danno
mother-3, and one end of the edge 3 is bonded to the diaphragm 1. This type of cone type
speaker has the advantage that the piston vibration area is wider than a flat plate speaker
described later, but there is a problem that peaks and lags occur on the sound pressurefrequency characteristics due to the shape of the diaphragm. is there. FIG. 2 shows the structure
of a conventional flat loudspeaker, in which 11 is a relatively thin flat diaphragm made of paper
or the like, 12 is an edge, -13 is an edge, 14 is a frame, 15ij yoke, 16if & chair coil, 17 is a center
I-le, 18 is a permanent magnet, and 19TI'i gasket, and the structure of the diaphragm 11 and the
frame 14 is the same as that of the cone type speaker shown in FIG. Is the same. Although this
flat-plate speaker has a narrower piston vibration area than a cone-type speaker, since the
diaphragm 11 is a bi2 flat plate, peaks and dips on the sound pressure-frequency characteristics
that are problems with the cone-type speaker There is an advantage that the phase-frequency
characteristic of the present invention appears flat. Moreover, it can be obtained from the
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vibration theory as well as improvement of structural aspects such as using a honeycomb
structure which can lighten the piston vibration region and increase its thickness as a diaphragm,
obtain a material having a large Young's modulus, etc. By adopting the driving method, it is not
difficult to achieve the same level as the cone type speaker. That is, in terms of vibration and
sound field, flat-plate speakers also have sufficient performance to counter cone-shaped
speakers. However, considering the structure, it is still not sufficient and there is a problem. As
one of them, since the diaphragm 11 is a flat plate, the distance in the height direction between
the dan coil 12 supporting the discoil 16 and the edge 13 supporting the diaphragm 11 is
extremely higher than that of the cone type speaker It is short and it is difficult to obtain the
linearity of the vibration system.
Specifically, is there a sideways vibration in the vibration system at a specific frequency? The
Inuko ? ииииииииииииииииии is that the coil 16 contacts the center pole 17 or the yoke 15 of the magnetic
circuit and emits an abnormal sound. Further, in the flat panel speaker, since the distance
between the diaphragm 11 and the surface of the frame 14 facing the back surface of the
diaphragm 11 is equidistant in each part, a standing wave is generated, and the peak and dip on
the sound pressure-frequency characteristics May occur. Although it is conceivable to increase
the distance between the damper 12 and the edge 13 and to increase the height of the bobbin of
the K # chair coil 16, this not only reduces the features of the flat-panel speaker which is thin,
but also The increase in the weight of the flat panel speaker may lower the efficiency of the flat
speaker, or may cause resonance in the bobbin itself. This invention was made to solve the
above-mentioned problems, and a support member formed in a hollow disk shape from a sound
absorbing elastic material is interposed between the back surface of the flat diaphragm and the
frame and adhered. Thus, it is possible to provide a flat plate speaker capable of preventing the
occurrence of standing waves between the back surface of the moving plate and the frame, which
can suppress the lateral vibration of the vibrating plate, and both of them. The purpose is to
Hereinafter, the present invention will be described based on the illustrated embodiment. FIG. 3
shows an embodiment of the present invention, wherein 11 is a flat diaphragm, 13 Fi edge, 14 ti
frame, 15 is a yoke, 16 is a discoil, 17 Fi 7 n p? 18 is a permanent magnet, 19 is a gasket, 20 is a
support member, and is a hollow circle having an outside diameter smaller than the outside
diameter of the diaphragm 11 and an inside diameter larger than the outside diameter of the
discoil 16 by a sound absorbing elastic material. It is formed in a plate shape (donut shape), and
is disposed between the back surface of the diaphragm 11 and the surface of the frame 14
opposed thereto. The support member 20 serves as Danno 4-to enhance the linearity of the
vibration system and to remove standing waves in the space on the back side of the diaphragm
11, and one end face is on the back of the diaphragm 11. The other end faces are respectively
bonded to the frame 14. The flat panel speaker according to the present invention is structured
as described above, and a sound absorbing elastic body is filled as a support member 20 in the
space on the back surface of the moving plate 11, and the end face thereof is the moving plate
11 and the frame Since it is bonded to 14, the function of the damper which gives linearity to the
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vibration system is sufficiently fulfilled, the lateral vibration of the vibration system is
suppressed, and the generation of the standing wave in the space is prevented. Good soundfrequency characteristics can be expected.
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