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JP2010045496

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DESCRIPTION JP2010045496
An object of the present invention is to provide a cone speaker which improves the intelligibility
of sound by improving the frequency characteristic of high sound. A voice coil bobbin (7) is
joined to an inner peripheral edge of a central portion of a cone-shaped diaphragm (2), and has a
center cap (4) at a front central portion. The outer peripheral edge of the cone-shaped diaphragm
2 is fixedly supported by the flange 1 a of the frame 1 via the edge 3. The center cap 4 functions
as a dome-shaped diaphragm. The root 5a of the horn 5 is closely spaced on the front face of the
center cap 4 to form a small diameter root opening 22. The inner surface 5c of the horn 5 is a tip
along the first acoustic path from the root 5a. It is enlarged to the part 5 b and this tip 5 b forms
a horn opening 23. The horn body 5 is fixedly supported by the horn support 6 on the flange 1 a
of the frame 1. [Selected figure] Figure 1
コーンスピーカ
[0001]
The present invention relates to a cone speaker for full range.
[0002]
Heretofore, various structures are known to improve the high frequency characteristics of a cone
speaker, for example, a double cone speaker.
The double cone is a small diameter lightweight center cone attached to the end of the voice coil
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1
bobbin. The vibration of the center cone in the high region increases the radiation efficiency of
high-pitched sound compared to a single cone. However, since the center cone is not supported
at its outer periphery, resonance occurs to distort the sound, and there is a problem that the
interference of the sound radiated from both cones disturbs the frequency characteristic. Also,
there is one in which a spherical diffuser is disposed at the front center of the cone. By this
diffuser, the phase characteristic is improved, and the directivity characteristic of high sound is
improved. However, since the improvement of the phase characteristic is only the high tone
specific part, there is a problem that it is difficult to obtain satisfactory sound quality.
[0003]
Further, there is one in which a ring phase equalizer (donut-shaped equalizer) is provided (see
Patent Document 1). FIG. 10 is an explanatory view of a conventional cone speaker provided with
an annular phase equalizer. In the figure, 101 is a main cone, 102 is a sub-cone, 103 is a drive
wire ring frame (voice coil bobbin), 104 is a cone holding film (damper), and 105 is an annular
phase equalizer. Attaching the dome shaped secondary cone 102 to the central portion of the
conical main cone 101 increases the high frequency radiation efficiency. An annular phase
equalizer 105 is provided on the inner surface of the main cone 101 near the boundary edge
106 between the main cone 101 and the sub cone 102. Thereby, the phase difference of the
sound waves emitted from each part at the aperture plane is reduced by the diffraction
phenomenon by the annular phase equalizer 105. As a result, it is described that the directivity
characteristic can be improved while reducing the variation of the radiation impedance due to
the frequency. In addition, it is also described that the unevenness on the sound pressure
frequency characteristic that occurs due to the interference of sound waves due to the phase
difference is eliminated. However, this ring phase equalizer 105 does not try to improve the
clarity by raising the high tone response.
[0004]
In addition, there is a coaxial speaker in which a high-tone speaker is disposed at the center of a
bass cone speaker. However, since the coaxial speaker is a complex of speakers of different
character, there is a problem that the connection of the sound quality of each speaker is bad. In
addition, since the position of the voice coil of each speaker is shifted back and forth, there is
also a problem that the phase of the sound wave emitted from each speaker is shifted. Japanese
Examined Patent Publication No. 31-9903
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2
[0005]
It is an object of the present invention to provide a cone speaker that improves the intelligibility
of the sound emitted from the speaker by improving the frequency characteristics of high sound.
[0006]
In the invention according to claim 1, in the cone speaker, a horn body is provided, and a root
portion of the horn body is closely spaced on the front surface of the center cap to form a root
opening having a small diameter. The inner surface of the horn is expanded from the root
opening to the tip along the first acoustic passage, the tip forms a horn opening, and the rear
surface of the horn is the cone-shaped diaphragm A second acoustic passage is formed between
the horn and the inner surface, and the horn is fixedly supported by the frame or the baffle.
The arrangement of the horn body with respect to the center cap has a structure similar to that
of a horn speaker, so that the sound emitted from the center cap via the first acoustic path has
the characteristics of the horn speaker. Also, in the second acoustic passage, the horn body
eliminates interference between the sound from the root of the cone-shaped diaphragm and the
sound from the center cap, thereby preventing a decrease in response.
[0007]
In the invention according to claim 2, in the cone speaker according to claim 1, a root portion of
the horn body has a curved shape along a front surface of the center cap. Therefore, the electroacoustic conversion efficiency is increased by the compression effect in which the space between
the root of the horn and the front surface of the center cap is compressed by the vibration of the
center cap.
[0008]
In the invention according to claim 3, in the cone speaker according to claim 1 or 2, the back
surface of the horn body is shaped to expand on the back side of the horn body. Therefore, in the
second acoustic passage, the phase interference between the sound wave emitted from the coneshaped diaphragm and the sound wave emitted from the cone-shaped diaphragm and reflected
by the rear surface of the horn is reduced.
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[0009]
In the invention according to claim 4, in the cone speaker according to any one of claims 1 to 3,
an equalizer is provided, and a base portion of the equalizer is inside the horn body, and the
center The curved surface is closely spaced along the front surface of the cap, and the outer
peripheral surface of the equalizer forms the first acoustic path between it and the inner surface
of the horn and is reduced along the first acoustic path. The equalizer is fixed to and supported
by the horn body or the frame or the baffle. Therefore, by making the position of the acoustic
passage equidistant from the central portion and the peripheral portion of the center cap, the
phases of the sound wave emitted from the central portion of the center cap and the sound wave
emitted from the peripheral portion of the center cap are matched. It is possible to prevent the
deterioration of the response due to the phase interference in the region. In addition, the area of
the acoustic passage between the horn body and the equalizer is narrowed at one end to increase
the squeeze rate, whereby the electroacoustic conversion efficiency is increased.
[0010]
The present invention has the effect of simplifying the configuration, improving the high-pitched
sound characteristics, and improving the intelligibility of the sound emitted from the speaker.
The horn body disposed in front of the center cap prevents the voice coil from jumping out even
when a large signal is input, thus preventing the cone-shaped diaphragm from being broken. The
presence of the horn body and the support of the horn body makes it difficult for the user to
insert a finger to the center cap and the cone diaphragm. Therefore, it is possible to prevent
damage due to the center cap and the cone diaphragm being carelessly pressed.
[0011]
The present invention does not have a center cone that causes unnecessary resonance or causes
sound interference as compared to the conventional double cone speaker. In the present
invention, the response of high sound is improved as compared with the one provided with the
conventional diffuser annular phase equalizer. The ring phase equalizer does not improve the
high tone response because it is separated from the center cap and the center hole of the ring
phase equalizer is widely separated from the horn shape. Since the present invention is a single
unit as compared with the conventional coaxial speaker, the sound quality with good connection
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can be obtained, and the phase shift due to the different sound source central points does not
occur.
[0012]
FIG. 1 is an explanatory view of a cone speaker according to a first embodiment of the present
invention. Fig.1 (a) is a top view, FIG.1 (b) is front sectional drawing seen in the arrow A direction
in the AA cross section which passes along the speaker central axis of Fig.1 (a). FIG.1 (c) is front
sectional drawing to which the principal part of the modification was expanded. In FIG. 1A, 1 is a
frame, 2 is a cone-shaped diaphragm, 3 is an edge, 4 is a center cap, 5 is a horn body, and 6 is a
horn support. In FIG. 1B, 7 is a voice coil bobbin, 8 is a voice coil, 9 is a damper, 10 is a pole
piece, 10a is a center pole, 10b is a flange, 11 is a plate, 12 is a magnet, 13 is an input terminal
plate, 14 Is a tinsel wire (lead wire).
[0013]
First, a structure common to a general cone-type speaker will be described. The frame 1 has a
flange 1a at the front. The detailed structure of the flange 1a is omitted. The inclined support
plate 1c connected to the flange 1a is provided with a plurality of back openings 1d. The shape,
number and arrangement of the back opening 1 d are arbitrary. A stepped portion is provided
from the root portion 1e of the inclined support plate 1c to have a circular bottom plate 1f, and
the circular bottom plate 1f is provided with a through hole 1g through which a voice coil bobbin
7 described later is inserted. In the flange 1a, a mounting hole 1b is formed in a portion where an
outer end 6a of a horn support 6 described later is overlapped. The mounting hole 1b is for
screwing a cone speaker to a baffle (not shown) such as a front baffle plate or a ceiling plate. This
mounting hole may be located at another position (angular position) of the flange 1a.
[0014]
This cone type speaker is an electrodynamic (dynamic) speaker, and utilizes an electromagnetic
force generated by flowing a current through a magnetic circuit. The voice coil bobbin 7 is joined
to the inner peripheral edge of the central portion of the cone-shaped diaphragm 2, and the
center cap 4 is provided at the front central portion. The outer peripheral edge of the coneshaped diaphragm 2 is fixedly supported by the flange 1 a of the frame 1 via the edge 3.
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[0015]
The center cap 4 functions as a dome-shaped diaphragm. The illustrated center cap 4 is joined to
a position close to the voice coil bobbin 7 in the cone-shaped diaphragm 2, but may be joined to
the same inner peripheral edge together with the voice coil bobbin 7. The voice coil bobbin 7 is a
cylindrical member, and the voice coil 8 is wound. The damper 9 is joined to the voice coil
bobbin 7 and the root portion 1 e of the inclined support plate 1 c and supports the voice coil
bobbin 7 on the frame 1. The damper 9 is also called a spider.
[0016]
The center pole 10a of the pole piece 10 is inserted into the voice coil bobbin 7 and can be
moved back and forth (up and down in the drawing). The rear end surface (the lower surface in
the drawing) of the pole piece 10 is a flange portion 10 b, and a holed disk-shaped plate 11 is
joined to the back surface of the circular bottom plate 1 f of the frame 1. A holed disk shaped
magnet 12 is provided so as to be sandwiched between the flange portion 10 b and the plate 11.
A cylindrical magnetic gap is formed between the center pole 10a and the central hole 11a of the
plate 11, and the voice coil 8 is disposed in this magnetic gap.
[0017]
The lead wire (not shown) of the voice coil 8 is connected to the tinsel wire (lead wire) 14 on the
cone-shaped diaphragm 2, and the tinsel wire 14 is connected to the input terminal plate 13. The
magnetic circuit is constituted by the pole piece 10, the plate 11 and the magnet 12 described
above, and when an audio signal is supplied to the voice coil 8 located in the magnetic gap, the
voice coil bobbin 7, the cone type diaphragm 2 and the center cap 4 vibrate. Sound is emitted
from the cone opening 21 of the cone diaphragm 2.
[0018]
In this embodiment, the horn 5 is added to the general structure of the above-mentioned cone
type speaker. The horn 5 has a symmetrical shape with respect to the central axis of the coneshaped speaker. Since the thickness of the cross section near the root 5a below the horn 5 in the
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drawing is substantially zero, the root 5a has a linear circular shape. The root portion 5a is
closely spaced on the front face of the center cap 4 to form a root opening 22 of small diameter,
and the inner surface 5c of the horn 5 is expanded from the root portion 5a to the tip portion 5b
along the first acoustic path. The tip 5 b forms a horn opening 23. The thickness in the vicinity of
the end 5b is substantially zero in the illustrated example, so the end 5b is a linear circle.
[0019]
In general, a horn speaker has higher electroacoustic conversion efficiency than a cone-type
speaker. However, the frequency characteristics change according to the length of the acoustic
path and the like. The horn body 5 shown in the figure is for representing the center cap 4 as a
diaphragm of a horn speaker to increase the high efficiency of electroacoustic conversion and to
improve the clarity of sound. Therefore, the horn 5 can also be referred to as a center cap horn.
However, in the horn speaker, the dome-shaped diaphragm is in the enclosed space except for
the opening of the horn body. Therefore, the combination of the center cap 4 and the horn 5 is
not the horn speaker itself.
[0020]
The first acoustic path of the horn 5 shown in the figure is relatively short so that it matches the
frequency band for which the response is to be increased, and the horn opening 23 recedes
below the cone opening 21 of the cone diaphragm 2 in the figure. doing. It is preferable that the
root portion 5a be as close as possible to the front face of the center cap 4 in order to approach
the structure of the horn speaker. However, the center cap 4 vibrates due to the input sound
signal. Therefore, it is assumed that the root portion 5a is closely spaced at a distance not to
contact the center cap 4 even by the vibration of the center cap 4 at the maximum allowable
input. As a result, the generation of noise due to the contact and the damage of the center cap 4
are prevented.
[0021]
In the case of a full range speaker, the speaker aperture is 16.5 cm to 20 cm, and the lower the
sound, the larger the maximum amplitude. At the maximum allowable input, the center cap 4 is
displaced to 2 to 3 mm before by vibration. Accordingly, it is appropriate for the root portion 5 a
of the horn 5 to be separated by 3 mm from the center cap 4. In addition, if buffer members,
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such as a felt, are provided in the root part 5a of the horn body 5, even if the center cap 4
collides, the center cap 4 is hard to be damaged. The back surface 5 d of the horn 5 is not in
contact with the inner surface 2 a of the cone-shaped diaphragm 2. The back surface 5 d of the
horn body 5 forms a second acoustic path between itself and the inner surface 2 a of the coneshaped diaphragm 2. The sound waves emitted from the cone-shaped diaphragm 2 are emitted
obliquely to the central axis along the second acoustic path, so that they function as a diffuser
and the directivity in the high region is broadened.
[0022]
The horn 5 shown in the drawing is not uniform in thickness in cross section like the horn of a
conventional horn speaker, and the back surface 5 d of the horn 5 is shaped to bulge on the back
side of the horn 5. In other words, it is curved and bulges so as to be convex on the back side of
the horn 5. The illustrated shape is a smooth curved surface, but may be formed into a partial
spherical surface having a predetermined radius. With such a shape of the back surface 5d, the
sound wave generated from the cone-shaped diaphragm 2 and the sound wave reflected by the
sound wave on the back surface 5d are less likely to cause phase interference, so there is little
disturbance of the phase. It is hard to produce disorder. If the disturbance of the phase is not a
problem, the thickness of the horn 5 may be constant.
[0023]
The horn body 5 is provided with the flanges 1a of the frame 1 by four horn support bodies
(spokes) 6 disposed radially at equal angles with respect to the central axis of the cone speaker
so that the horn body 5 is arranged as described above. Fixedly supported. The horn support 6
may be plural other than four. The horn support 6 is made smaller so as not to affect the sound
wave propagation. The illustrated horn support 6 is curved to be convex forward so as not to
touch the edge 3 having a semicircular cross section in the illustrated example. The horn support
6 is superimposed on the flange 1a at its outer end 6a, and its mounting hole 6b coincides with
the position of the mounting hole 1b. The inner end 6 c of the horn support 6 is joined to the tip
5 b of the horn 5.
[0024]
In the modification shown in FIG. 1 (c), the horn 5 of FIG. 1 (b) is fixedly supported by using a
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horn support 61 on a baffle 62 such as a front baffle or a ceiling plate. The configuration of the
frame 63 is basically the same as the frame 1 of FIG. 1 (b). The screw 64 is inserted into the
mounting hole 63 b formed in the flange 63 a, and the cone speaker is mounted and fixed to the
baffle 62. The mounting hole 63b may be located at another position (angular position) of the
flange 63a.
[0025]
The illustrated horn support 61 is curved so as to be convex forward (upper in the figure) so as
not to touch the screw 3 of the edge 3 and the mounting hole 63b. A mounting hole 61b is
formed in the outer end portion 61a of the horn support 61, and a recess 61c is formed in the
upper portion thereof. The horn support 6 may be plural other than four. The screw 64 is
inserted into the mounting hole 61 b to fix and fix the horn support 61 to the baffle 62. The head
of the screw 64 is embedded in the recess 61c. Since the frame 63 and the horn support 61 are
coupled via the baffle 62, the horn 5 is indirectly fixedly supported to the frame 1.
[0026]
According to the configuration described above, since the horn 5 is fixed to the frame 1 via the
horn supports 6 and 61, the vibration of the cone-shaped diaphragm 2 and the center cap 4 is
not transmitted to the horn 5. The horn 5 and the horn supports 6, 62 are wood, synthetic resin,
metal or the like, or a combination thereof. Highly rigid composite materials that are resistant to
vibration are preferred. The horn 5 and the horn supports 6, 62 may be integrally molded.
[0027]
FIG. 2 is a graph of frequency response showing the operation and effect of the horn 5 shown in
FIG. This graph does not show measured values, but is prepared for explanation. In the figure, the
horizontal axis is frequency (logarithm) [kHz], and the vertical axis is frequency response
(response) [dB]. The broken line 31 is the characteristic of the conventional cone-type speaker.
The solid line 32 shows the characteristic in the band different from the characteristic of the
broken line 31 when the horn body 5 is provided to the conventional cone-type speaker. By
providing the horn body 5, an improvement of 2 to 3 dB is observed in the high-tone band (about
2 to 10 kHz) slightly above the midrange.
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[0028]
In the conventional cone-shaped speaker, the response decreases in the band indicated by the
solid line 32, and the interference of sound waves due to the phase difference between the root
portion and the peripheral portion of the cone-shaped diaphragm 2 or the cone-shaped
diaphragm 2 Peaks and dips occur due to split vibration. On the other hand, by providing the
horn 5, the radiation impedance applied to the center cap 4 is increased in the band indicated by
the solid line 32, impedance matching of the speaker is achieved, and the efficiency of the high
region is increased.
[0029]
FIG. 3 is a front cross-sectional view for explaining the second embodiment of the present
invention. In this embodiment, the horn 5 shown in FIG. The other configuration is the same as
that of FIG. 1, and the same reference numerals are given to the same parts. The horn body 41 is
also rotationally symmetrical with respect to the central axis of the cone-shaped speaker. The
cross section in the vicinity of the root portion 41 a of the horn 41 is thick. The root portion 41 a
is a curved surface having a relatively large area along the front surface of the center cap 4, and
is closely spaced on the front surface of the center cap 4 to form a small diameter root opening
42. Since the illustrated center cap 4 is dome-shaped, the root portion 41a has a curved surface.
The inner surface 41 c of the horn 41 is enlarged from the root opening 42 along the first
acoustic path to the tip 41 b, and the tip 41 b forms a horn opening 43.
[0030]
The rear surface 41 d of the horn 41 forms a second acoustic passage between the rear surface
41 d of the horn 41 and the inner surface 2 a of the cone-shaped diaphragm 2, and the horn 41
is fixed to the flange 1 a of the frame 1 by four horn supports 6. Be supported. Instead of the
horn support 6, the horn support 61 of FIG. 1 (c) may be used. The horn supports 6 and 61 may
be plural other than four. In this embodiment, since the root portion 41a of the horn body 41
covers in a closely spaced state except for the center of the center cap 4, the sound wave emitted
from the center cap 4 is narrowed by the root opening 42 and emitted. Ru. As a result,
particularly in high-pitched sound, the acoustic impedance becomes large and the impedance
matching can be taken to improve the response. The tip portion 41 b and the back surface 41 d
are similar in shape to the horn 5 of FIG. 1 and function as a diffuser.
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[0031]
FIG. 4 is a front cross-sectional view for explaining the third embodiment of the present
invention. This embodiment is obtained by adding an equalizer 54 to the second embodiment
shown in FIG. Therefore, the horn 51 has a thinner cross section near the root 51a than the horn
41 shown in FIG. The root portion 51 a is a curved surface having a relatively narrow area along
the front surface of the center cap 4, and the root opening 52 is larger than the root opening 42
in FIG. 3. The cone opening 53 is the same as the cone opening 43 of FIG.
[0032]
The base 54 a of the equalizer 54 is inside the horn 51 and has a curved surface shape which is
closely spaced along the front surface of the center cap 4. The outer peripheral surface 54b of
the equalizer 54 forms a first acoustic passage with the inner surface 51c of the horn 51, and is
shaped to be reduced along the first acoustic passage. In the illustrated example, the inclined
surface gradually becomes smaller, and has a conical shape (cone having a circular arc side
surface) which becomes a point at the tip 54c. In the illustrated example, the tip 54 c is
substantially at the position of the cone opening 21 of the cone-shaped diaphragm 2 in front of
the horn opening 53.
[0033]
In the arrangement of the equalizer 54 described above, four equalizer support members 55
arranged radially from the outer peripheral surface 54 b are joined to the inner surface 51 c of
the horn 51, and indirectly through the horn support 6. It is realized by being fixed and
supported by the flange 1a. Instead of the horn support 6, the horn support 61 of FIG. 1 (c) may
be used. The horn supports 6 and 61 may be plural other than four. Also, the equalizer support
55 may be directly fixed and supported on the frame 1, for example, the flange 1 a. Alternatively,
the equalizer support 55 may be fixed to and supported by the baffles 62 of FIG. 1C so as to be
fixed to the frame 1 indirectly.
[0034]
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The above-described equalizer 54 narrows the area of the acoustic path at one end to increase
the squeeze rate, and as a result, improves the electroacoustic conversion efficiency. Further, by
making the position of the acoustic passage equidistant from the central portion and the
peripheral portion of the center cap, the phase of the sound wave emitted from the central
portion of the center cap 4 and the phase emitted from the peripheral portion of the center cap 4
Reduce the phase shift of the sound wave. As a result, the addition of the equalizer 54 further
enhances the efficiency of high-pitched sound reproduction and improves the clarity.
[0035]
As the above-mentioned equalizer 54, what is employ | adopted not only in the shape of
illustration but the conventional horn speaker can be used. For example, it may be shaped so as
to have a plurality of sound guides forward from the base portion 54a, and each sound guide has
an opening on the back surface 54b. The equalizer support 55 is made smaller so as not to affect
the sound wave propagation. The equalizer 54 and the equalizer support 55 are premised not to
vibrate and are formed of the same material as the horn 5 and the horn support 6. These may be
integrally molded with the horn 5 and the horn support 6.
[0036]
In the above description, the speaker grille and the speaker net were not touched. However, in
normal use, the cone opening of the speaker is covered by the speaker grille and the speaker net
to protect the inside. Assuming that a speaker grille or a speaker net is used, the abovementioned horns 5, 41, 51 are coupled to or integrally formed with the speaker grille or the
speaker net frame via a horn support of an appropriate shape. You may Similarly, the equalizer
54 may be coupled to or integrally molded with the speaker grille or the speaker net frame via an
appropriately shaped equalizer support. By mounting the speaker grille and the speaker net
frame on the cone speaker front baffle (corresponding to a ceiling plate in the case of a ceiling
speaker), the horn body and the equalizer are indirectly fixed and supported on a frame similarly
mounted on the front baffle It will be.
[0037]
5 to 9 are graphs showing output sound pressure frequency characteristics according to the first
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embodiment of the present invention. In a room which can not be said to be an anechoic room,
responses at multiple frequency points are simply measured. The prototype speaker was
provided with a horn support on a commercially available full range cone speaker of 20 cm
diameter. The prototype speaker is basically the same as the cone speaker having the structure
shown in FIG. 1, but the specific shape is not as shown in FIG. The horn support supports a
wooden horn by folding a copper metal rod. The cone type diaphragm is a paper, and the center
cap is a thin aluminum plate.
[0038]
5 to 9 show the measurement results of the output sound pressure frequency characteristics in
the directions of 15 degrees, 30 degrees, 45 degrees, and 60 degrees in the central axis direction
of the cone speaker, respectively. The broken line shows the characteristics before adding the
horn, and the solid line shows the characteristics after adding the horn. Pink noise was input and
measured at a distance of 50 cm from the cone opening of the cone-shaped diaphragm (closer to
the general 1 m to avoid room effects). The output sound pressure level (SPL: Sound Pressure
Level) [dB] up to 20 [kHz] was simply measured for frequencies of 200 [Hz] or more that are not
easily affected by room resonance.
[0039]
In the direction of the center (central axis direction) and 15 degrees shown in FIGS. 5 and 6, the
sound pressure is increased by adding the horn 5 at 3,200 to 10,000 Hz. In general, a horn
speaker has an acoustic conversion efficiency higher by about 10 [dB] than a cone speaker.
However, it has been common knowledge that the diaphragm and the root of the horn are sealed
except for the opening to make a compression driver. On the other hand, in the embodiment of
the present invention, although not sealed, the high region can be raised to such an extent that
the clarity is increased.
[0040]
As shown in FIG. 7, it can be seen that the directivity characteristic is also improved because the
decrease in sound pressure is small in the above-mentioned high sound band even at 30 degrees.
In the directions of 45 degrees and 60 degrees shown in FIGS. 8 and 9, the effect of the addition
of the horn body can not be seen. In the case where an equalizer (the diameter of the base 54a is
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larger than that of the equalizer 54 shown in FIG. 4) is added to the cone speaker of FIG. 1
having no thickness at the root 5a of the horn 5 The sound pressure in the vicinity of 20,000 Hz
increased.
[0041]
When a DC component is applied to the present speaker by mistake, the root 5a projects the
center cap 4 in FIG. 1 (b), and the lower surface of the root 41 a projects the center cap 4 in FIG.
Then, the lower surface of the root portion 51 a can prevent the center cap 4 from protruding. In
this case, the embodiments of FIG. 3 and FIG. 4 with large corresponding surfaces are effective.
[0042]
The invention is suitable for ceiling mounted loudspeakers where the clarity is required over a
wide angular range.
[0043]
It is explanatory drawing of the cone-type speaker of the 1st Embodiment of this invention.
It is a graph which shows the effect of the horn body shown in FIG. It is front sectional drawing
explaining the 2nd Embodiment of this invention. It is a front sectional view explaining a 3rd
embodiment of the present invention. It is a graph which shows the frequency characteristic
(central axis) of the 1st Embodiment of this invention. It is a graph which shows the frequency
characteristic (15 degrees) of the 1st Embodiment of this invention. It is a graph which shows the
frequency characteristic (30 degrees) of the 1st Embodiment of this invention. It is a graph which
shows the frequency characteristic (45 degrees) of the 1st Embodiment of this invention. It is a
graph which shows the frequency characteristic (60 degrees) of the 1st Embodiment of this
invention. It is explanatory drawing of the conventional cone speaker which provided the cyclic |
annular phase equalizer.
Explanation of sign
[0044]
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Reference Signs List 1 frame 1a flange 1b mounting hole 1c inclined support plate 1d back
opening 1e root portion 1f circular bottom plate 1g through hole 2 cone-shaped diaphragm 2a
2a Inner surface, 2b: back surface, 3: edge, 4: center cap, 5: horn body, 5a: root, 5b: tip, 6: horn
support, 6a: outer end, 6b: mounting hole, 6c: inside End portion 7 voice coil bobbin 8 voice coil
9 damper 10 pole piece 10a center pole 10b flange portion 11 plate 11a central hole 12 magnet
13 input terminal plate ... 14... 、 Wire line 21 .. cone opening 22 .. root opening 23 .. horn
opening 31 .. characteristics of a conventional cone-shaped speaker 32 .. characteristics of a
cone-shaped speaker provided with a horn body 41 .. horn Body, 41a Root portion, 41b: tip
portion, 41c: inner surface, 41d: back surface, 42: root opening portion, 43: horn opening
portion, 51: horn body, 51a: root portion, 51b: tip portion, 51c: inner surface, 51d: back surface ,
52: root opening, 53: horn opening, 54: equalizer, 54a: base, 54b: outer peripheral surface, 54c:
tip, 55: equalizer support, 101: main cone, 102: secondary cone, 105, ... Annular phase equalizer,
106 ... borderline
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