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JPS56120296

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DESCRIPTION JPS56120296
Description 1, title of the invention
Ribbon type speaker
3. Detailed Description of the Invention The present invention relates to a ribbon type speaker
characterized in that a ribbon is formed in a substantially T-shaped cross section and its vertical
portion is inserted into the magnetic gap of a magnetic circuit. A conventional speakerphone is
shown in FIGS. 1 and 2. FIG. Among them, those shown in FIG. 1 are opposed to the upper
surface of the yoke 2 'with the magnets 3', 3'B and the upper surfaces of the magnets 3 ', 3'B
through the magnetic gap 5'. A planar ribbon 6 'formed by printing a conductor on a substrate
such as a plastic film in the magnetic gap 5' of the magnetic circuit 1 'formed by solidifying the
plate 41' and 4'B. Was placed. Then, by applying a current to the ribbon 6 'disposed in the
magnetic field flowing in the magnetic gap 5' of the magnetic circuit 1 ', a force corresponding to
the direction of the current is generated to generate an acoustic wave. In addition, as shown in
FIG. 2, a magnet 3 "is fixed to the upper surface and the center of the yoke 2", and magnets 3 "B
and 3" B are firmly attached to the left and right of this magnet 3 ". The magnetic circuit 1〃, 1
′ ′ is formed by fixing the plate 4 ′ ′, 4 ′ ′ B onto the upper surface of the magnet 3 ′ ′
B, 3 ′ ′ B via the magnet 3 ′ ′ and the magnetic cap 5 ′ ′. The magnetic circuit 1 ′ ′ is
disposed at one side of the m′′5 ′ ′ of the m′′5′′5′′5 ′ ′ inner ribbon 6 ′ ′
and 6 ′ ′-slidingly. However, in the electrodynamic loudspeakers shown in FIGS. 1 and 2, the
loudspeakers 6 'and 6 "are planar, and the magnetic gap between the plates 4' and 4'B (see FIG.
1). The distance of 57 m or the distance between the magnet 3 "and the plate 4" or the magnetic
gap 5 "and 5" between the magnet 3 'and the plate 4 "B (see FIG. 2) Because the magnetic flux
density is low as 4000 to 7000 GUSs widely, a large magnet 3 ', 3' B is needed to obtain a sound
pressure level. The present invention has been made in view of the above-mentioned points, and
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an object of the present invention is to form a ribbon in a substantially planar shape of an LIT
and place the vertical portion in the magnetic cap of a magnetic circuit and at least By passing
the current to the vertical portion, the entire ribbon can be vibrated in the direction orthogonal
to the passage of the magnetic gap + a bundle by passing the current, so that the sound pressure
level can be made higher than before or the magnetic circuit is configured IJy Ribbon-type slider
that can make the magnet to be smaller than before. The present invention will be described
below with reference to FIGS. 3 and 4.
A magnetic circuit 11 ′ ′ is a magnetic circuit, and the magnetic circuit 1 includes three
magnets 3B, which are fixed to the upper surface of the yoke 2 and a plate 4 and 4B, which is
fixed to the upper surface of the magnet 3 and 3B. It is formed by A wide magnetic gear 775 is
formed by cutting the opposing upper surfaces of the plates 4A and 4BKil-1 into a taber, and a
narrow magnetic gap 7'5B is formed at the lower opposing portion. Also, as shown in FIG. 4, the
wide magnetic gap 5 of IIIJ can be easily formed even if the opposite upper surface is cut away. I!
Consisting of a flat plate 6 mm and a vertical portion 6B hanging down at the lower center of the
flat plate 6A. The flat plate 6 of this No. 6 6 is disposed by bonding the left and right sides of the
left and right sides thereof with an adhesive or the like in the wide magnetic gap 5A, and the
other side is a vertical part 6B is disposed in the narrow magnetic gap 5B. The entire ribbon 6 is
formed of a material having high conductivity, such as aluminum, or of course, when the flat
plate portion 6 and the vertical portion 6B are formed of a plastics material, a conductor such as
silver or aluminum 6c is formed on the flat plate portion 6B and the vertical portion 6B, the
conductor portion 6G is formed on at least the vertical portion 6B. T is a pressing plate fixed to
the upper surfaces of the plates 4B and 4B in order to press the ribbon 6 with the left and right
@M edges of the six flat plate portions. One embodiment of the present invention is configured as
described above, and a wide magnetic gap formed on the opposite upper surface of the flat
surface of the T-shaped ribbon 6 and the flat surface of the ribbon 6 of 4T, 4B. Since the vertical
portion 6B of the ribbon 6 is disposed in the narrow magnetic cap 5B disposed in the lower
opposing portion of the ribbon 5 disposed within the 5B, when the current flows through the
ribbon 6, this current and the plate 4m, 4B (Because the passing magnetic flux of EndPage: 2
from the magnet 3 flows in the nap 5B, the ribbon 6 vibrates in the vertical direction in the
drawing to generate an acoustic wave. That is, when the whole of the ribbon 6 is formed of a
material having high conductivity such as aluminum, it is sufficient to flow a current through the
whole of the carbon 6 as it is, and the ribbon 6 is a sheet made of a nonconductive material such
as plastics. When it is formed, an electric current is applied to the conductor portion 6C of silver,
aluminum or the like formed on the flat plate 6 of the ribbon 6 and the vertical portion 6B, and
the telephone 6 vibrates in the vertical direction to generate an acoustic wave. In this case, a
narrow magnetic gap 5I3 ′ ′ generally shaped tip formed between the plates 7 and '7. The gap
may be equivalent to the gap of the magnetic circuit used for the dome-shaped conductive
speaker, so the magnetic flux from the magnet 3 is flowing at high density, and the vertical
portion of the ribbon 6 inserted in the magnetic gap 5B. Because the 6m receives the high
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density magnetic flux over the entire surface, the ribbon 6 provided with the flat 6m on the
ground surface of the vertical portion 6B moves up and down in the same direction with a large
amplitude compared to the conventional product. It becomes.
Therefore, if the sound pressure level is still less than that of the conventional one and if the
same output sound pressure level as that of the conventional one is generated, the magnetic
circuit 1 is configured as b-r! The size can be reduced by reducing the size of the net 3 and 3B'i
as compared with the conventional one. Further, even if current is supplied only to the vertical
portion 6B inserted in the magnetic cap 5B, the entire ribbon 6 can be easily moved up and down
in the same direction. As described above, according to the present invention, the ribbon is
formed into a substantially T-shaped cross section, the flat plate portion is disposed in the
magnetic gap between the plates, and the vertical portion has a narrow magnetic width
equivalent to that of the conventional conductive speaker. Being placed in the gap, the sound
pressure level can be increased, and the ground and the magnet that composes the entire
magnetic circuit can be made smaller than before. Hair
4. Brief description of the drawings FIGS. 1 and 2 are sectional views showing respective
examples of conventional ribbon type speakers, FIG. 3 is a sectional view showing one
embodiment of a ribbon type speaker according to the present invention, FIG. FIG. 4 is a sectional
view showing another embodiment. DESCRIPTION OF SYMBOLS 1 ··· Magnetic circuit, 2 ·· Yoke, 3
m, 3 B ··· Magnet, 4 m, 4 B ··· Plate, 5 m ··· Magnetic gap, 5 B ··· Magnetic gap, 6 · Ribbon, 6 people
... Flat portion, 6B ... Vertical portion. Watch Applicant Pioneer Corporation EndPage: 3
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