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JPS4864919

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DESCRIPTION JPS4864919
Patent application Showa 4! Dec. Dec. year; Patent Director, General Secretary Ito Takehisa [Fa]
Japan Patent Office Open Patent Gazette ■ JP-A-48-64919 Examination Requested (All 3 Pages)
1 Name of Fine Document 11 Invention Speaker Speaker Dome What is claimed is: 1. A
loudspeaker diaphragm comprising:
-1 Claim
3. Detailed Description of the Invention The present invention relates to a diaphragm of a dome
speaker for medium and high sound, and more specifically, to significantly improve the vibration
characteristics of the dome speaker. A so-called dome speaker with a hemispherical diaphragm
has been widely used for medium and high-tone speakers because it is excellent in sound
diffusion, but the vibration transmitted from the voice coil to the diaphragm is It propagates from
the periphery of the diaphragm to the top of the spherical surface, and at that time there is no
flat reproduction frequency characteristic due to modulation caused by phase shift or positive or
negative phase phenomenon that occurs. There are a lot of ears that emit an ear jI sound at the
frequency, and those that try to improve this have also been proposed, but it was not possible to
achieve the expected effect. The object of the present invention is to eliminate such a
phenomenon, to enable reproduction to the highest frequency range that can be reproduced
flatly without losing sound diffusion and to enable easy reproduction of i sound. Another object
of the present invention is to improve reproduction frequency characteristics with a simple
structure. Further objects of the present invention will become apparent as the following
description proceeds with reference to the accompanying drawings. EndPage: A yoke outer plate
(2) and a yoke inner plate are held around a magnet (1), and two places around the yaw outer
plate and inner plate are fastened with screws (4). There is a sensor body-port 717 (6) one end of
which is crimped or welded to the hole (5) of the yoke outer plate (2), and the tip of the center
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1
ball (6) A voice coil (8) is positioned between the tip and the yoke inner plate (3), and the voice
coil (8) has a dome-shaped diaphragm (9). Are linked. In the figure, the diaphragm (9) has a
thickness of about 0. / No, 2sn, made of polyethylene terephthalate resin, polyester and other
synthetic resin materials having the same effect, metal material, etc. The plate αD (11) attached
to the yoke inner plate (3) by a screw rod ing. I is a magnet guide, (S is a decorative plate, Oe is a
mounting screw hole of the speaker, and 扛 is a terminal. In the vicinity of the top surface of the
vibration plate (9), a vibration absorbing substance θ, crab attachment or application is applied.
As the vibration absorbing material αB, various materials, sizes, thicknesses j and shapes may be
used according to the purpose, but according to the experiment of the invoker, animal leather,
vegetable fiber material or these materials It has been found that plastic and other substances
having the same effect are preferred.
2 to FIG. 6 show reproduction frequency characteristics and a characteristic curve when the
vibration absorbing material is not provided and when various materials are provided. FIG. 2 is a
characteristic curve when nothing is provided, and there are sharp beaks near the lead / 2000
subcle, so that an ear sound is generated and it is difficult to hear. FIG. 3 shows a characteristic
curve in the case where deerskin is attached to the top surface of the diaphragm with a size of
about 10111% in diameter and about thickness / fl. When nothing was provided, there was no
sudden change in frequency characteristics that appeared, and flat playback was possible up to
the highest frequency range, and it was possible to listen extremely well without producing ears
or annoying sounds. However, since the sound was not attached to the entire surface of the
diaphragm, the sound diffusion and other characteristics were not impaired. FIG. 4 shows the
frequency characteristic curve when the felt is attached to the top surface of the diaphragm. The
characteristic curve in this case is similar to that of the animal leather, and it can be heard in the
same way. The present invention has a gate structure as described above, so the dome speaker
You can eliminate the inconspicuous, offensive, hard-to-hear sounds that occur when you
reproduce the sound, and re-. 1 ”′ ′ c * bt, tv ′ ′ ′ gate that reproduces extremely audible
sounds up to the highest possible range.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the 0 embodiment of the present
invention, FIG. 1 is a cross sectional view, and FIG. 2 to FIG. 2 are frequency characteristic curves.
REndPage: 2S mouth (Y ')' j 嘗 · EndPage: 3
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