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JP2004343670

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DESCRIPTION JP2004343670
[PROBLEMS] In a conventional loudspeaker, the diaphragm is conical and rigidity is increased to
suppress divided vibration and the audio frequency band is made to emit sound by piston
motion. Therefore, when the piston motion limit point is exceeded, the piston responds to the
signal There was a problem that exercise could not be done with corn paper, lack of brilliance
and poor intelligibility. This point is improved to provide a high-quality speaker with a clear and
beautiful sound. SOLUTION: In an electrodynamic speaker unit, piston movement of a voice coil
is connected to a plane diaphragm made of a wood plate through a coupling member, the low
range is piston motion, and the middle and high range is vibration by split vibration The problem
is solved by vibrating the plate. The vibrating flat diaphragm covers the reproduction band with
piston motion and divided vibration, so a wide frequency band from low to high can be
reproduced with a single speaker, enabling clear reproduction with excellent over-wave
characteristics. And [Selected figure] Figure 1
Flat speaker
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit for converting an audio signal to sound. 2. Description of the Related Art A dynamic
speaker, which is currently mainstream, supplies voice current to a voice coil placed in a strong
magnetic field to cause the voice coil to move in a piston and transmit its vibration to conical
paper and air. Vibrate. The movement of the diaphragm, but in the low frequency range where
the frequency is low, the entire cone paper vibrates with the piston motion moving back and
forth according to the movement of the voice coil, but when the frequency becomes high, the fast
voice coil In the movement of the cone, the whole cone paper can not keep up, and only the
vicinity of the center of the cone vibrates, or the whole diaphragm does not move back and forth,
causing divided vibration. In this conventional speaker design, the rigidity of the diaphragm is
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enhanced, and the divided vibration due to the deflection is suppressed, and the audio frequency
is reduced, because a unique sound is generated from the cone paper due to the divided vibration
and the frequency characteristic is disturbed. I've been seeking to make a sound in the piston
motion in the band. Therefore, plastic products in which rigidity is given to corn paper, products
in which carbon fibers are mixed, and products in which rigidity is enhanced by using metal are
in widespread use. In addition, the medium sound and high sound are small diaphragms that can
respond to fast movement, and the medium sound is transmitted to the squawer, and the high
sound is transmitted to the tweeter of the smaller diaphragm. Is the mainstream. However,
compared to the raw sound emitted by a musical instrument, there are many products that the
reproduced sound from the present speaker is inferior in the excess wave characteristic and
lacks sharpness. As the cause, the rigidity of the diaphragm is increased, the division vibration
due to the deflection is suppressed, and the conventional thinking of trying to make sound in the
audio frequency band with piston motion is contrary to the sound of the speaker without a sense
of movement It is thought that the sound is missing and musically boring. For example, it is
assumed here that there is a conventional low frequency speaker with a diameter of 30 cm and
the reception band thereof is 30 to 1,500 Hz. If the frequency is increased gradually from 30 Hz
to 1500 Hz in this woofer, the voice coil and cone move together with piston motion up to a
certain frequency range, but if the piston motion limit point is exceeded, then this is divided
vibration Get started. However, since the cone paper has increased rigidity, it is less likely to
cause divided vibration due to deflection.
Moreover, since the air resistance is received on the entire surface of the high rigidity cone
paper, a partial piston movement can not be performed, that is, a contradiction occurs that the
cone paper itself suppresses the force of the voice coil to move quickly. ing. As a result, when a
100 Hz signal of the same magnitude and a signal of 1000 Hz are applied to the voice coil, the
amplitude should be the same originally, but at 1000 Hz there is a phenomenon that the
amplitude of cone paper becomes extremely small. It will do. Such a phenomenon also occurs in
squawkers and tweeters, and as a result, there are many products which are poor in overwave
characteristics with respect to the signal and which are not soothing. Also, flat speakers of similar
structure have already been developed, but the diaphragm has a honeycomb structure, and the
diaphragm is made rigid so that it produces sound in the audio frequency band by piston motion.
Met. Then, although the speaker in the multi-way configuration can widen the reproduction
frequency, signal degradation due to the coil and the capacitor occurs because the LC network is
inserted between the amplifier and the speaker. In addition, since the phases are shifted around
the crossover frequency of each speaker, the synthesis of sound in space can not be completed
completely, and the connection of sounds is often deteriorated. As described above, in the
conventional speaker, the diaphragm is made conical, the rigidity is increased, the division
vibration is suppressed, and the audio frequency band is made to produce the sound by the
piston motion. When the limit point of the piston motion is exceeded, the cone paper can not
perform the piston motion according to the signal, and there is a problem that the sharpness is
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lacking and the intelligibility is deteriorated. It is an object of the present invention to improve
this point and provide a high-quality speaker with a clear sound and beautiful sound. SUMMARY
OF THE INVENTION The present invention relates to an electrodynamic speaker unit in which
piston movement of a voice coil is connected to a plane diaphragm made of a wood plate through
a coupling member, and the low frequency range is a piston In the motion, the middle and high
frequency range solves the problem by vibrating the diaphragm with split vibration. The
vibrating flat diaphragm covers the reproduction band with piston motion and divided vibration,
so a wide frequency band from low to high can be reproduced with a single speaker, enabling
clear reproduction with excellent over-wave characteristics. And By making the flat diaphragm
into a wooden plate, it is possible to reproduce a beautiful high-quality sound without disturbing
the frequency characteristics even if the vibration changes from piston motion to divided
vibration.
DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail
below. Figure 1 is a schematic perspective view of the diaphragm of the present invention, with
the frame, magnet, and damper omitted for clarity. Reference numeral 1 in the figure is a
diaphragm. This diaphragm is made of a light wooden board such as balsa. The three voice coils
and the one diaphragm are adhesively bonded by two connecting members. When the voice coil
of 3 vibrates, the diaphragm of 1 also vibrates. The diaphragm 1 is a wooden board, so it can be
flexed while having a certain degree of rigidity, so the whole board performs piston movement in
the low range, and split vibration occurs in the middle and high range. Since the diaphragm
which received the vibration of the voice coil can be flexibly received from low frequency
vibration to high frequency vibration, this speaker has a very wide reproduction frequency range
with the lower limit around 50 Hz and the upper limit up to 20 kHz or more In addition to being
able to extend the frequency response, by making the diaphragm a wooden board, it is possible
to reproduce the pleasant sound that the musical instrument plays. By forming the outer
peripheral portion of the diaphragm in a wedge shape, it is possible to prevent a wave
propagating from the central portion to the outer peripheral portion of the diaphragm from
returning from the outer peripheral portion to the central portion. As the enclosure, a flat baffle
or an open back type is suitable. Although this speaker can be used as a full range speaker
because it has a wide reproduction frequency range, the reproduction frequency range can be
further expanded by additionally using a small thing of the same structure as a supertweeter.
Effect of the Invention Since a wooden board can be bent while having rigidity to a certain extent,
the whole board performs a piston motion in the low frequency range, and split vibrations occur
in the middle and high frequency ranges. Since the flat diaphragm which received the vibration
of the voice coil can flexibly receive from the vibration of low frequency to the vibration of high
frequency, this speaker has a very wide reproduction frequency range with the lower limit
around 50 Hz, and the upper limit is 20 kHz or more The frequency response can be extended to
provide clearer and brighter reproduced sound than conventional speakers. By making the
diaphragm a wooden board, it is possible to reproduce the pleasant sound produced by the
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musical instrument. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective
view showing a basic configuration of a diaphragm of a flat speaker system according to the
present invention. FIG. 2 is a cross-sectional view of the flat loudspeaker system of the present
invention. FIG. 3 is a schematic perspective view of the entire flat speaker system of the present
invention.
FIG. 4 is a rear view of the flat loudspeaker system of the present invention. [Explanation of the
code] 1 diaphragm 2 connecting member 3 voice coil 4 frame 5 damper 6 magnetic circuit
section 7 edge
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