JPS5187431

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DESCRIPTION JPS5187431
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a cross-sectional view of a horn speaker,
FIG. 2 is a perspective view showing a vibrating portion, and FIG. 3 shows a horn of the present
invention. A front view and FIG. 4 are enlarged sectional views for explaining the operation of the
vibrating portion. Further, in the reference numerals used in the drawings, 1 is a pole plate, 2 is a
horn, 2a is a throat, 4 is a pole plate, 7 and 8 are permanent magnets, 9 is an air gap, 10.11 is a
ribbon vibrator, 12 is an elastic body, 14 is an air chamber. Fig. 1 Fig. 3-65-F-51-s 743 z (2) Fig.
2 Fig. 4-66
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel
configuration of horn speaker. In a horn speaker in which sound waves are emitted in the
vibration direction of the diaphragm based on a conventional voice coil and diaphragm, the
braking by the horn is made to ring (1) or the output sound pressure is increased. For this
reason, a person with a normal swing board usually takes 1-7- 'larger than the area of the horn
plate and generally takes twice or more. Because the diaphragm and the horn inevitably move in
the cavity, and the diaphragm is connected to the horn through this cavity, the high-pitched
region suddenly becomes K in size. There is. In order to prevent this, it is necessary to make the
distance between the diaphragm and the horn as narrow as possible. However, in order for the
diaphragm to vibrate in the direction of the horn, it is necessary to provide a distance between
the diaphragm and the horn so that the diaphragm does not contact the horn due to the
vibration. In addition, due to air flow non-linearity due to the cavity, there is a case where the
harmonic distortion occurs. The present invention is a book aiming to provide a new parent
structure (2; Ns beka) without the above-mentioned drawbacks. Hereinafter, the present
invention will be described in detail. According to the present invention, the horn speaker
company according to the present invention, two vibrators disposed opposite to each other so as
to emit a sound wave in a direction perpendicular to the movement direction by the approaching
and separating motion, and a sound acoustically coupled to the vibrators. And a horn. [7]
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Preferably, the moving body is formed of a conductive ribbon, which is disposed in six fields, and
vibrates in a direction perpendicular to the magnetic field by passing an f'LK voice current [7,
this fl The exhaust and intake air in the air layer formed by are directed in the direction of the
magnetic field, configured to emit sound waves in this direction, and the horn is formed to extend
into the air layer. In particular, the 1 (3) horn speaker can convert a high frequency range of 5
KHz to 40 KHz to high fidelity. It also has high conversion efficiency. Next, one embodiment of
the present invention will be described based on the drawings. 1 to 4 are books showing a horn
speaker according to the present embodiment. In this figure, (1) is a front pole plate, and a sound
temple horn (2) is formed on-. The front pole plate (1) also comprises an inwardly extending
projection (3) to form the horn (2) and to effectively form a magnetic path. (4) is a rear pole plate
and has a protrusion (5) to form an effective magnetic path.
The end face of the projection (5) is provided with # t16 + extending vertically to form an air
passage. + 71 + 81 is a strong permanent (4) magnet that applies a magnetic field. A pair of
pleated conductive ribbon vibrators (IHυ) face the air gap (9) formed between the projection (3)
of the front pole plate fi + and the projection (5) of the rear pole plate (4) It is arranged. This
ribbon swing 1 body mouth 10υ is suitable for aluminum foil with a thickness of 30 an and a
width of 4 to 5 m. The interval between the ribbon vibrator αO and 0υ is approximately 2 to 3
·, and the bottom of the ribbon vibrator II [α1] is closed by the elastic body t121. The elastic
body a3 is preferably one having a film formed on the surface of a foamable polyurethane to be
non-air-permeable. A cross section formed by a pair of ribbon vibrators I ′ 1 1 1 P fi ・ and an
elastic body 02 connecting the same] The vibrating portion 03 in the shape of a letter is disposed
in close proximity to the throat (21) of the horn (2) The air layer (4) formed in a U-shape is
arranged to be an extension of the horn (2). Accordingly, the elastic body (5) a2 is in a state
where the bottom of the horn formed by the horn (2) and the air layer I is closed. The upper and
lower ribbon vibrators a1α are held by the insulating holder 051Q [9], and the ribbon vibrators
On and αυ are electrically connected in the upper part, and the lower part is separated, and the
matching transformer 07 ′ is provided. Connected to l. The matching transformer a は is a pair
of ribbon vibrators (as the direct current resistance of 11 is 1000 & Qt, it is a book having a
turns ratio of 1 = 9 to connect to the output terminal of about 8Ω of the amplifier) There is. In
this embodiment, the gap between the vibrator (11j11 + 1) and the throat portion (2a) of the
horn (2) is approximately (1, 1) and supplied close. Also, the strength of the magnetic field of the
air gap (9) is set to 10 kilowatts or more. Ｑ８１Ｑ！ In the figure, # is an acoustic cowhide, and
is a cha (6) member which is surrounded by a permanent magnet 171i 31 and a magnetic pole
plate tll (41 and upper and lower holding plates (not shown)). On the wall surface of the sound
storage compartment 09, a sound absorbing material 2 for absorbing the sound wave generated
on the back surface is attached. Next, the operation of this horn speaker will be described. Now,
an audio signal is supplied to the terminal 2 + 1, the reflux flows from the bottom to the top in
the ribbon oscillator 01, and the current flows from the top to the bottom in the ribbon oscillator
QIIK. A magnet (7), a front pole plate fil, an air gap (9), and a rear pole plate (4) (Magnetic circuit
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and permanent magnet dark), a front pole plate il +, an air gap (9 [and a rear pole plate ( The
ribbon oscillator QQ is displaced in the direction of the arrow by the magnetic field 0 applied in
the direction indicated by the arrow in FIG. 1 by the magnetic path consisting of 4) and the above
current, 01) is displaced in the direction of the arrow @ (7) since a ribbon oscillator 0 (current in
the direction opposite to I is flowing).
Therefore, the ribbon vibrator-and a 離 are separated from each other, and the air layer a41
surrounded by the U-shaped cross section expands. Next, the direction of the vibrating body (I
[〔Kfifi, the direction of the current is reversed, the ribbon vibrating body Q (in FIG. 2, from top
to bottom in 1 and ribbon vibrating body 01 in FIG. If the current flows to the ribbon vibrator,
the ribbon vibrator-is displaced in the direction of the arrow (c) in FIG. 3 based on the left-hand
rule of framing and is displaced in the direction of the ribbon vibrator (IIlFi arrow (c)). That is, the
ribbon vibrator 001 and 0υ approach each other, and the air layer (141 contracts). In this way
the volume of air layer a4! Cause air to vibrate and sound waves are generated. This sound wave
is generated in the direction perpendicular to the bearing direction of the vibration of the carbon
vibration body Q1) αυ. This sound wave is then emitted through the pole plate (1 + 9 horn (2)).
At this time, a sound wave is also generated at the back 1tiK, which is absorbed by the sound
absorbing material. (8) On the back surface of the elastic body aδ, the air escapes up and down
through the groove (6), and the vibration part is not adversely affected. As is clear from the
explanation of 1 and n 迄 1 in this horn speaker, the ribbon vibrator (IQ (lυ is configured to act
as both the voice coil and the diaphragm of a general horn type dynamic speaker And because it
is lightweight, conversion efficiency is extremely high. For example, it is 100 dB / W / m. Also,
the transient characteristic t is also j? It is excellent, and high fidelity conversion is possible in the
high range. Also, in this cone speaker, since the ribbon vibrator (+0101) does not vibrate in the
direction of the horn (2), the throat portion (2a) K of the horn (2) is brought into close proximity
to arrange the ribbon vibrator ++ 11υ You can do it. Therefore, in the conventional horn
speaker, there is almost no equivalent to the cavity between the diaphragm and the horn (9;
between 9; and there is no ill effect replacement due to the cavity. Therefore, it is possible to
obtain progressive characteristics. Also, in the horn speaker of this embodiment, the air 44! The
ratio of the opening area of 41 to the cross-sectional opening area of the throat (2a) of the horn
(2) is approximately 1 to 1, and the air layer is like an extension of the horn (2), The rise and fall
of the pressure at the opening of the air layer I become almost equal to the rise and fall of the
pressure at the throat of the horn, and harmonic distortion does not occur as in the conventional
horn speaker, High fidelity conversion can be performed. Further, in this embodiment, since the
ribbon vibrator Hfl11 is disposed to face each other and the imaging is performed in the opposite
direction to each other, the comparison in the case of a single swing plate is compared.
Therefore, the amount of exhaust and intake can be approximately doubled, and a high output
sound pressure can be obtained according to V. Also, in this embodiment, since the horn is
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formed by the pole plate (1), the device is simplified. As mentioned above, although attached and
described to one Example of this invention, this invention is not limited to the above-mentioned
Example, It can deform | transform further. For example, the shape of the horn (2) is not limited
to the shape as shown in FIGS. 1 and 3, and may be a shape appropriately selected from conical
horns, index horns, hyperbolic horns and the like. In the embodiment, the horn (2) is formed of
the pole plate fil, but only the horn may be formed independently t7, or the pole plate (1) may
form a part of the horn, and the rest may be another It may be formed of Alternatively, the
conductive ribbon may be attached to the synthetic resin sheet without forming the vibrating
body α and α and the conductive ribbon as in the embodiment. In addition, the αυ permanent
magnet (71f8 + may be replaced by an electromagnet). Also, the length of the vibrating body elf)
tll may be adjusted appropriately.
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