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JP2012227733

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2012227733
PROBLEM TO BE SOLVED: Regardless of whether a listener is in a standing position or in a
sitting position or in any angular direction in a circumferential direction without limiting a
lighting device to be combined, There is provided a speaker system for ceiling installation
capable of sound reproduction with less occurrence of peak dip in sound pressure frequency
characteristics, and a lighting device using the same. A conical surface or a conical surface
between a top surface and a bottom surface A cabinet including a mounting surface portion
forming a pyramidal surface, and a plurality of speakers mounted on the mounting surface
portion of the cabinet, each of the plurality of speakers having an elongated planar diaphragm
disposed along the mounting surface portion The long and thin plane diaphragms are disposed
such that the top surface side and the bottom surface side are the major axis direction, and the
direction in which the mounting surface section orbits the conical surface or the pyramid surface
is the minor axis It is. [Selected figure] Figure 1
Speaker system for ceiling installation and lighting device using the same
[0001]
The present invention relates to a ceiling mounted speaker system installed on a ceiling surface
to reproduce sound, and in particular, installed and connected to and engaged with lighting
sockets (ceiling, rosette) on the ceiling surface, and other lighting devices are also connected The
present invention relates to a speaker system for ceiling installation that can be used and a
lighting device using the same.
[0002]
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1
Audio equipment for reproducing sound includes a speaker system for ceiling installation
installed on the ceiling surface of a house or store.
In addition, among the speaker systems for ceiling installation, there are a speaker system
integrated with a lighting device installed on the ceiling, or a speaker system enabled to be used
in combination with the lighting device. This speaker system may be used by being mounted on a
hanging type lighting fixture that is used by being suspended from a ceiling surface. In the case
of combining the speaker system and the lighting device, the power supply supplied to the
lighting device can be used, and therefore, there are some which incorporate an amplification
circuit or a receiving circuit which requires the power supply.
[0003]
For example, conventionally, it is a speaker mounted on a hanging type lighting fixture, which
has an insertion hole penetrating vertically through a central portion, and the hanging type
lighting fixture is suspended in the insertion hole. In addition, an outer casing through which a
power supply cord to a lighting fixture is inserted, a speaker unit disposed in the outer casing,
and a signal receiving unit that receives a signal sent from a transmitting unit and amplifies the
signal to drive the speaker unit And there is a speaker characterized in that (Patent Document 1).
[0004]
Also, conventionally, it is an acoustic device that is set in relation to an object and a lighting
device, and it is possible to There is an acoustic device comprising a second fixing portion for
fixing and electrically connecting a lighting device (Patent Document 2).
Here, the sound generation unit is an active speaker driven by a driving power supply, and the
driving power supply may be supplied from the object side to the sound generation unit via the
first fixing unit and the main body.
[0005]
Patent No. 2570763 (FIGS. 1 to 5) Japanese Patent Application Publication No. 11-225385 (FIGS.
1 to 21)
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2
[0006]
However, in the case of the ceiling-mounted speaker system combining the lighting devices of the
prior art, for example, in the case of Patent Document 1, the lighting device to be combined is
substantially limited. There is a problem that it is not suitable for BGM reproduction that is
required for a speaker system for ceiling installation or that it is easy to understand and rinse.
Further, in the case of Patent Document 2, since the radiation sound from the front side of the
speaker transducer and the radiation sound from the back side of the speaker transducer which
is its reverse phase component are supplied to the listener, The synthetic sound of has the
problem that it becomes a sound pressure frequency characteristic in which a large peak-dip
appears as a result of these cancellations.
[0007]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to provide a speaker system for ceiling installation which is installed on the
ceiling surface of a house or a store to reproduce sound, Peak of the sound pressure frequency
characteristics regardless of whether the listener is in the standing position or in the sitting
position or in any angular direction in the circumferential direction without limiting the lighting
device to be used. -It is providing the speaker system for ceiling installation which can suppress a
dip easily, and can reproduce | regenerate a favorable audio | voice, and an illuminating device
using the same.
[0008]
The speaker system for ceiling installation of the present invention has a socket portion
connected to and engaged with a lighting socket installed on a ceiling surface, a top surface
portion including the socket portion, and a bottom surface portion having an external dimension
smaller than the outer diameter of the top surface portion. And a cabinet including a mounting
surface forming a conical surface or a pyramidal surface between the top surface and the bottom,
and a plurality of speakers mounted on the mounting surface of the cabinet, each of the plurality
of speakers comprising It has an elongated flat diaphragm disposed along the mounting surface,
and the elongated flat diaphragm has a major surface direction on the top surface side and the
bottom surface side, and a short direction in which the conical surface or the pyramid surface of
the mounting surface is circled It is arranged to be radial.
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3
[0009]
Preferably, in the ceiling mounted speaker system according to the present invention, the conical
surface or the pyramidal surface formed on the mounting surface portion of the cabinet has a
cross-sectional crossing angle of about 30 ° to 60 ° with the ceiling surface.
[0010]
In addition, preferably, in the ceiling mounted speaker system according to the present invention,
the plurality of speakers are arranged so as to substantially equally divide one round in the
direction in which the mounting surface portion of the cabinet circulates.
[0011]
Also, preferably, in the ceiling mounted speaker system according to the present invention, the
cabinet has a recess in communication with the central opening in the bottom surface and the
socket in the top surface, and the socket further includes the central opening and the recess The
light source further comprises a light socket that makes it possible to connect and engage.
[0012]
In addition, preferably, the speaker system for ceiling installation of the present invention is
attached to the inside of a cabinet, and an amplifier circuit which is supplied with power from a
socket for illumination through a socket and outputs amplified audio signal to a speaker, Further
equipped.
[0013]
In addition, preferably, the speaker system for ceiling installation of the present invention is
attached to the inside of a cabinet, is supplied with power from a socket for lighting through a
socket part, converts a received wireless signal into an audio signal, and an amplifier circuit And
a wireless reception circuit for outputting the
[0014]
Further, the lighting device of the present invention includes the above-described speaker system
for ceiling installation, and a lighting unit which is connected to and engaged with the lighting
socket of the socket unit and is supplied with power from the lighting socket for lighting.
[0015]
Hereinafter, the operation of the present invention will be described.
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4
[0016]
The speaker system for ceiling installation of the present invention has a socket portion
connected to and engaged with a lighting socket installed on a ceiling surface, a top surface
portion including the socket portion, and a bottom surface portion having an external dimension
smaller than the outer diameter of the top surface portion. And a mounting surface portion
forming a conical surface or a pyramidal surface between the top surface portion and the bottom
surface portion, and a plurality of speakers attached to the mounting surface portion of the
cabinet.
In this ceiling-mounted speaker system, it is preferable that the cross-sectional crossing angle
between the conical surface or the pyramidal surface formed on the mounting surface portion of
the cabinet and the ceiling surface be about 30 ° to 60 °.
Each speaker has an elongated flat diaphragm disposed along a mounting surface portion which
is a conical surface or a pyramidal surface, and therefore, even if the speaker system is mounted
on a ceiling surface, the direction of the sound wave is inclined In the downward direction,
regardless of whether the listener is at the standing position or at the sitting position, it is
difficult for the peak-dip to appear in the sound pressure frequency characteristics, and good
sound reproduction can be enabled.
[0017]
In particular, each of the plurality of speakers is arranged such that the elongated flat diaphragm
has the top surface side and the bottom surface side as the long diameter direction, and the
direction in which the mounting surface surface circumscribes the conical surface or the pyramid
surface is the short diameter direction. Thus, the directivity of sound reproduction is narrow in
the height direction along the major axis direction, and the directivity is wide in the lateral
direction along the minor axis direction.
The radiation characteristic of the speaker of the flat flat diaphragm which is driven on the entire
surface is narrow in the major axis direction and broad in the minor axis direction.
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Further, the plurality of speakers are arranged so as to substantially divide one round in the
direction in which the mounting surface portion of the cabinet circulates.
Therefore, even if it is a speaker system for ceiling installation attached to a ceiling surface, the
influence of the ceiling surface which is a reflector of a sound wave of a height direction, or the
umbrella part of a pendant type illuminating device can be decreased, Sound pressure frequency
characteristics are unlikely to appear in the sound pressure frequency characteristics regardless
of whether the person is in the standing position or in the sitting position, or in any angular
direction in the circumferential direction, and good voice reproduction Becomes possible.
[0018]
Further, in the speaker system for ceiling installation, the cabinet has a recess in communication
with the central opening in the bottom and the socket in the top, and the socket connects the
other lighting devices through the central opening and the recess. It further includes a light
socket that makes it possible and engageable.
More specifically, an amplifier circuit attached to the inside of the cabinet and supplied with
power from the lighting socket through the socket to output amplified audio signals to the
speaker, or the socket from the lighting socket The radio receiver circuit further includes a radio
reception circuit which is supplied with power via the terminal and converts the received radio
signal into an audio signal and outputs the audio signal to the amplifier circuit.
Therefore, this ceiling-mounted speaker system can be a combination target without limiting not
only the lighting device to be combined but also the audio reproduction device for supplying the
audio signal to the speaker.
Of course, as a single lighting device incorporating a speaker, the above-mentioned speaker
system for ceiling installation, and a lighting unit which is connected to and engaged with the
lighting socket of the socket unit and is supplied with power from the lighting socket for lighting
You may have.
[0019]
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6
The speaker system for ceiling installation of the present invention does not limit the lighting
device to be combined, and whether the listener is in the standing position or in the sitting
position, and also in any angular direction in the circumferential direction Regardless of the
presence of the sound pressure frequency characteristic, it is difficult for the peak dip to appear
in the sound pressure frequency characteristic, and good sound reproduction can be enabled.
[0020]
It is a figure explaining the speaker system 2 for ceiling installation by the preferred embodiment
of this invention, and the illuminating device 30 using the same.
(Example 1) Fig. 1 is an enlarged perspective view for explaining a speaker system 2 for ceiling
installation according to a preferred embodiment of the present invention.
(Example 1) It is an expanded sectional view explaining the speaker system 2 for ceiling
installation by preferred embodiment of this invention. (Example 1) Fig. 1 is an exploded
perspective view illustrating a speaker 10 used in a speaker system 2 for ceiling installation
according to a preferred embodiment of the present invention. (Example 1) It is a graph which
shows the sound pressure frequency characteristic in listening position P1 and P2 of the speaker
system 2 for ceiling installation by preferable embodiment of this invention. (Example 1) It is a
perspective view explaining the speaker system 101 for ceiling installation of the comparative
example 1, and a graph which shows the sound pressure frequency characteristic in the listening
positions P1 and P2. Comparative Example 1 A perspective view for explaining a speaker system
102 for ceiling installation of Comparative Example 2 and a graph showing sound pressure
frequency characteristics at listening positions P1 and P2. (Comparison 2) A perspective view for
explaining a speaker system 2a for ceiling installation according to another preferred
embodiment of the present invention. (Example 2)
[0021]
Hereinafter, although the speaker system for ceiling installation by the preferable embodiment of
this invention and the illuminating device using the same are demonstrated, this invention is not
limited to these embodiments.
[0022]
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7
FIG. 1 is a view for explaining a speaker system 2 for ceiling installation installed on a ceiling
surface 1 according to a preferred embodiment of the present invention, and a lighting device 30
using the same.
Moreover, FIG. 2 is an enlarged perspective view explaining the speaker system 2 for ceiling
installation, and FIG. 3 is the expanded sectional view. Furthermore, FIG. 4 is an exploded
perspective view explaining the speaker 10 used for the speaker system 2 for ceiling installation.
[0023]
Specifically, the speaker system 2 for ceiling installation is installed in connection with and
engaged with the lighting socket 1s on the ceiling surface 1 of the house or store, and the sound
from the upper side of the lighting device 30 suspended from the ceiling surface 1 is voiced Is a
speaker system for ceiling installation that plays back, and a pendant type lighting device 30 to
be combined can be arbitrarily selected. The lighting socket 1s for the ceiling surface 1 may be
called a sealing or rosette. Further, as will be described later, illustration of a part of the structure
unnecessary for the description, an internal structure, and the like is omitted.
[0024]
The speaker system 2 includes a total of four speakers 10 having an elongated flat diaphragm 15
in a cabinet 3 formed of resin or the like, and is installed on a ceiling surface 1 and provides an
audio signal to a listener located therebelow. Convert to sound waves and reproduce. The cabinet
3 has a circular top surface 4 opposed to the ceiling surface 1, a circular bottom surface 5 having
an outer dimension smaller than the outline of the top surface 4, and a conical surface between
the top surface 4 and the bottom surface 5. And a mounting surface portion 6 to be formed, and
the outer shape has a shape as if a part of a cone whose apex is directed downward is cut out. In
the case of the present embodiment, the diameter of the top surface 4 is about 30 cm, the
diameter of the bottom 5 is about 12 cm, and the conical surface formed on the mounting
surface 6 of the cabinet 3 has a cross section with the ceiling 1 The crossover angle θ is set to
be about 45 °. In addition, as for the attachment surface part 6 of the cabinet 3, it is preferable
that a cross-sectional crossing angle with the ceiling surface 1 becomes about 30 degrees-60
degrees.
04-05-2019
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[0025]
The cabinet 3 separates the front and back of the elongated flat diaphragm 15 of the speaker 10
attached to the mounting surface portion 6 so that sound waves having an antiphase relationship
radiated before and after the elongated flat diaphragm 15 cancel each other To prevent In
addition, the cabinet 3 has a space for defining an acoustic capacity in order to increase the bass
range near and below the lowest resonance frequency of the speaker 10. The cabinet 3 can adopt
cabinets of various types such as a closed type, a bass reflex type, a Kelton type, and the like. The
cabinet 3 of the speaker system 2 may be provided with a front grille (not shown), a punching
net, etc. so as to protect the exposed speakers 10.
[0026]
The cabinet 3 of the speaker system 2 includes a socket portion 20 connected to and engaged
with the lighting socket 1s installed on the ceiling surface 1 at the central portion of the top
surface portion 4 thereof. The socket unit 20 includes positive and negative connection
electrodes and an engagement mechanism according to the sockets of other lighting devices.
Therefore, a user who intends to install the speaker system 2 on the ceiling 1 holds the socket
portion 20 exposed at the central portion of the top surface 4 so as to support the cabinet 3 from
the lower side. As it approaches the socket 1s, the socket unit 20 and the lighting socket 1s can
be connected and engaged. Since the lighting socket 1s of the ceiling surface 1 which may be
referred to as sealing or rosette is used, the speaker system 2 can be installed or removed from
the ceiling surface 1 with easy operation. In the present embodiment, as shown in FIG. 3, the
ceiling surface 1 is provided with the cushion member 9 sandwiched between the ceiling surface
4 and the ceiling surface 4, and the ceiling surface 4 of the cabinet 3 vibrates and the ceiling
surface 1 There is no such thing as generating noise between them.
[0027]
As shown, the cabinet 3 of the speaker system 2 has a recess 7 at its center defining a cylindrical
space in the longitudinal direction. The recess 7 communicates with the central opening of the
bottom 5 and the socket 20 of the top 4. In addition, since the socket portion 20 further includes
a lighting socket that enables connection and engagement of the other lighting devices 30 via the
central opening and the recess 7, the suspension used by being suspended from the ceiling
surface 1 A downlight 30 can be used in combination. The pendant type illumination device 30
shown in the drawing includes an LED illumination (not shown) connected to the main body 32
04-05-2019
9
on the inner side of the umbrella 31 and is suspended by the connection cord 33 for supplying
the main body 32 with a power supply voltage. Further, since the socket 34 for illumination is
connected to the end of the connection cord 33, the socket 34 may be connected to and engaged
with the socket portion 20.
[0028]
Inside the cabinet 3 of the speaker system 2, there is provided a circuit unit 22 including a
wireless receiving circuit for converting a received wireless signal into an audio signal and an
amplifier circuit for outputting the amplified audio signal to the speaker 10. Power is supplied to
the circuit unit 22 from the illumination socket 1 s on the ceiling surface 1 from the socket unit
20 via the connection line 21. Therefore, audio reproduction can be performed from the speaker
system 2 for ceiling installation from an audio reproduction device such as a CD player (not
shown) via a wireless transmission device (not shown). The circuit unit 22 may be capable of
adjusting the volume of the amplifier circuit portion by a wireless signal or a remote control
signal. The speaker system 2 for ceiling installation can be a combination target without limiting
not only the lighting device 30 to be combined but also the audio reproduction device for
supplying an audio signal to the speaker 10.
[0029]
In the mounting surface 6 of the cabinet 3 of the speaker system 2, four speakers 10 are
arranged at intervals of about 90 ° in the circumferential direction so that one circumference is
substantially equally divided into four in the winding direction of the mounting surface 6 It is
done. As shown in FIG. 4, the speaker 10 has a thin rectangular flat diaphragm 15, an edge 16
vibratably supporting the periphery of the flat diaphragm 15, and a voice coil fixed to the back
side of the flat diaphragm 15. It is a flat-panel flat-screen speaker with a full-surface drive
including an assembly 11, a damper 14 that vibratably supports the voice coil assembly 11, a
frame 17, and a plurality of magnetic circuits 18 including magnets. The voice coil assembly 11
connects three voice coils 13 in a lattice shape by a bobbin 12, and the speaker 10 includes three
magnetic circuits 18 corresponding to the three voice coils 13.
[0030]
In the case of the present embodiment, the speaker 10 is disposed such that the flat diaphragm
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10
15 is along the conical surface of the mounting surface portion 6. The flat diaphragm 15 of the
thin rectangular speaker 10 disposed along the mounting surface 6 has a length in the major axis
direction da of about 9 cm and a length in the minor axis direction db of about 2 cm. The thin
rectangular flat diaphragm 15 of each speaker 10 is disposed so that the top surface 4 side and
the bottom surface 5 side are in the major axis direction da, and the direction circling the conical
surface of the mounting surface 6 is in the minor axis direction db. . Even if the speaker has a
configuration different from that of the speaker 10 illustrated in FIG. 4, it is a speaker provided
with the thin rectangular diaphragm 15 and having a narrow directivity in the major axis
direction and a broad directivity in the minor axis direction. The arrangement direction to the
mounting surface 6 may be set to the same condition as above.
[0031]
FIG. 5 is a graph showing sound pressure frequency characteristics of the ceiling mounted
speaker system 2 of the present embodiment. Specifically, FIG. 5 (a) shows the average value and
standard deviation of the sound pressure level at the listening position P1 at 72 points in the
circumferential direction, and FIG. 5 (b) shows the sound pressure level at the listening position
P2 at 72 points in the circumferential direction Mean and standard deviation. As shown in FIG. 1,
assuming a standing position of the listener, the listening position P1 has a distance y1 from the
ceiling surface 1 of about 75 cm and a radial distance r1 in the circumferential direction from the
center of the speaker system 2 of about It is a position of 1.0 m, and a total of 72 points are set
as measurement points every 5 ° in the circumferential direction. In addition, assuming that the
listening position of the listener is at the listening position P2, the distance y1 from the ceiling
surface 1 is about 1.2 m, and the radial distance r1 in the circumferential direction from the
center of the speaker system 2 is about 1.0 m The measurement point is 72 points in total at
every 5 ° in the circumferential direction. In addition, the umbrella part 31 of the illuminating
device 30 assumes a typical umbrella shape which cut out a part of spherical surface and arrange
| positions so that a convex side may become upper side, and the distance from the ceiling
surface 1 is about 70 cm in diameter about 50 cm It is supposed to be the case.
[0032]
As shown in FIG. 1, the sound waves radiated from the thin rectangular flat diaphragms 15 of the
plurality of speakers 10 mounted on the mounting surface 6 of the cabinet 3 of the speaker
system 2 are directly sounded s0 at the listening position P1 or P2. The reflected sound s1 of the
umbrella unit 31 of the lighting device 30 and the reflected sound s2 of the ceiling surface 1
come. The reflected sound s1 of the umbrella unit 31 of the lighting device 30 and the reflected
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11
sound s2 of the ceiling surface 1 have the same incident angle and reflection angle to the
reflecting surface. Since the reflected sounds s1 and s2 arrive delayed as compared with the
direct sound s0, the sound pressure frequency characteristic in which these are synthesized is
likely to have a constructive peak and a destructive dip. Also, looking at the sound pressure
distribution at a total of 72 points every 5 ° in the circumferential direction from the center of
the speaker system 2, the small standard deviation indicating the variation is in any angular
direction in the circumferential direction The change of the sound pressure frequency
characteristic is small, which indicates that good sound reproduction is possible.
[0033]
In the case of the present embodiment, in addition to the conical surface formed on the mounting
surface 6 of the cabinet 3 being set so that the cross-over angle θ with the ceiling surface 1 is
approximately 45 °, the speaker 10 The thin rectangular flat diaphragm 15 is disposed such
that the top surface 4 side and the bottom surface 5 side are in the major axis direction da, and
the direction in which the mounting surface 6 orbits the conical surface is the minor axis
direction db. Of the direct sound s0 at the listening position P1 or P2 and the levels of the
reflected sounds s1 and s2 at the listening position P1 or P2 by taking advantage of the
characteristic that the directivity is narrow in the major axis direction and the directivity is broad
in the minor axis direction There is an advantage that it can be made relatively higher. Therefore,
as shown by the characteristic curve of the average value in FIG. 5, the peak-dip caused by the
reflected sound component of the ceiling surface 1 or the umbrella portion 31 of the lighting
device 30 is suppressed at the standing position P1 and the seating position P2 A favorable flat
sound pressure frequency characteristic extending to a wide range is obtained. Further, with the
configuration of the speaker system 2 of the present embodiment, the variation in the sound
pressure frequency characteristics in the circumferential direction is reduced, and good sound
reproduction can be performed in any angular direction in the circumferential direction.
[0034]
Comparative Example 1 FIG. 6 is a view for explaining a speaker system 101 for ceiling
installation of Comparative Example 1. As shown in FIG. Specifically, FIG. 6 (a) is a perspective
view of the speaker system 101 of Comparative Example 1, and FIGS. 6 (b) and 6 (c) show the
sound pressure frequency characteristics at the listening positions P1 and P2. It is a graph which
is shown, and is a graph which shows an average sound pressure level and a standard deviation
in a total of 72 points every 5 degrees of a circumferential direction. The speaker system 101 of
Comparative Example 1 is different from the speaker system 2 of the above embodiment in that
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the shape of the cabinet 3 and the mounting direction of the speaker 10 mounted on the
mounting surface portion 6 are different. Others have nearly common configurations and size
dimensions. Therefore, the same reference numerals are given to the same parts as those in the
previous embodiment, and the description and illustration thereof will be omitted.
[0035]
Specifically, the cabinet 3 of the speaker system 101 of Comparative Example 1 includes a
square top surface 4 facing the ceiling surface 1, a square bottom surface 5 having an outer
dimension smaller than the outline of the top surface 4, and An attachment surface 6 that forms
a four-sided pyramidal surface between the surface 4 and the bottom 5 has an outer shape with a
shape in which a part of a quadrangular pyramid whose apex is downward is cut out. The thin
rectangular flat diaphragms 15 of the speakers 10 attached to the four pyramidal faces of the
mounting surface 6 of the cabinet 3 have the top surface 4 side and the bottom surface 5 side as
the short diameter direction db, and the conical surface of the mounting surface 6 Is disposed so
as to make the direction of circling the major axis direction da. As in the above embodiment, the
pyramidal surface formed on the mounting surface 6 of the cabinet 3 is set so that the cross-over
angle θ with the ceiling surface 1 is about 45 °.
[0036]
In the case of Comparative Example 1, the characteristic that the directivity is narrow in the
major axis direction of the speaker 10 having the thin rectangular diaphragm 15 and the
directivity is broad in the minor axis direction is reversely visible, and reflection occurs at the
listening position P1 or P2. The levels of the sounds s1 and s2 become higher relative to the level
of the direct sound s0, and as a result, as shown by the characteristic curve of the average value
in FIG. An undesirable sound pressure frequency characteristic having a large peak-dip generated
by the reflected sound component of the umbrella portion 31 of the lighting device 30 or 1 can
be obtained. Further, with the configuration of the speaker system 101 of Comparative Example
1, the variation in the sound pressure frequency characteristic in the circumferential direction
becomes large, and the frequency characteristic differs depending on the angle to the pyramidal
surface formed on the mounting surface 6 of the cabinet 3. There is a problem that the tone to be
reproduced is different.
[0037]
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13
Comparative Example 2 FIG. 7 is a view for explaining a speaker system 102 for ceiling
installation of Comparative Example 2. As shown in FIG. Specifically, FIG. 7 (a) is a perspective
view of the speaker system 102 of Comparative Example 2, and FIGS. 7 (b) and 7 (c) show sound
pressure frequency characteristics at the listening positions P1 and P2. It is a graph which is
shown, and is a graph which shows an average sound pressure level and a standard deviation in
a total of 72 points every 5 degrees of a circumferential direction. The speaker system 102 of
Comparative Example 2 is different from the speaker system 2 of the above embodiment in that
the shape of the cabinet 3 is different, and the other components have substantially the same
configuration and size. Therefore, the same reference numerals are given to the same parts as
those in the previous embodiment, and the description and the illustration are omitted.
[0038]
Specifically, the cabinet 3 of the speaker system 102 of Comparative Example 2 includes a
circular top surface 4 facing the ceiling surface 1 and a circular bottom surface 5 having the
same dimensions as the top surface 4, and the top surface A mounting surface 6 which is a
conical surface is not included between 4 and the bottom 5. As a result, the cabinet 3 has a shape
such that the outer shape is a part of a cylinder. Each of the four speakers 10 is attached to the
bottom 5 of the cabinet 3. The thin rectangular flat diaphragms 15 of the four speakers 10 are
arranged such that the center direction and the radiation direction of the bottom surface portion
5 are the major axis direction da, and the direction around the circular bottom surface portion 5
is the minor axis direction db. Be done.
[0039]
In the case of the comparative example 2, although the directivity is narrow in the major axis
direction of the speaker 10 provided with the thin rectangular diaphragm 15 and the directivity
is broad in the minor axis direction, the four loudspeakers 10 Since it is attached to the bottom 5
of the cabinet 3 so as to point directly downward, at the listening position P1 or P2, the level of
the reflected sound s1 becomes relatively higher than the level of the direct sound s0, and as a
result, As shown in the characteristic curve of the average value of 7, at the standing position P1
and at the sitting position P2, the undesirable sound pressure frequency characteristics are large
due to the peak dip generated by the reflected sound component of the ceiling surface 1 and the
umbrella portion 31 of the lighting device 30. can get. Further, due to the configuration of the
speaker system 102 of Comparative Example 2, there is a problem that the variation in the sound
pressure frequency characteristics in the circumferential direction becomes large, and the timbre
04-05-2019
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to be reproduced by voice becomes different depending on the position in the circumferential
direction.
[0040]
FIG. 2 is an enlarged perspective view illustrating a speaker system 2a for ceiling installation
according to another preferred embodiment of the present invention. The speaker system 2a of
this embodiment and the speaker system 2 of the previous embodiment are common except for
the configuration of the cabinet 3. Therefore, the same reference numerals are given to the same
parts as those in the previous embodiment, and the description and the illustration are omitted.
[0041]
The speaker system 2 includes a total of four speakers 10 having an elongated flat diaphragm 15
in a cabinet 3 formed of resin or the like, and is installed on a ceiling surface 1 and provides an
audio signal to a listener located therebelow. Convert to sound waves and reproduce. The cabinet
3 has a square top surface 4 facing the ceiling surface 1, a square bottom surface 5 having an
outer dimension smaller than that of the top surface 4, and four sides between the top surface 4
and the bottom surface 5. And a mounting surface portion 6 forming a pyramidal surface, and
the outer shape has a shape as if a part of a quadrangular pyramid whose apex is directed
downward is cut out. In the case of this embodiment, the length of one side of the top surface 4 is
about 30 cm, the length of one side of the bottom 5 is about 12 cm, and the pyramidal surface
formed on the mounting surface 6 of the cabinet 3 is The cross-sectional crossing angle θ with
the ceiling surface 1 is set to be about 45 °.
[0042]
In the case of the present embodiment, one speaker 10 is arranged such that the flat diaphragm
15 is along the vicinity of the center of the four pyramid surfaces of the mounting surface
portion 6. The thin rectangular flat diaphragm 15 of each speaker 10 is disposed so that the top
surface 4 side and the bottom surface 5 side are in the major axis direction da, and the direction
circling the conical surface of the mounting surface 6 is in the minor axis direction db . It should
be noted that even a speaker having a configuration different from that of the speaker 10
illustrated in FIG. 8 is a speaker having a narrow rectangular diaphragm 15 and having a narrow
directivity in the major axis direction and a broad directivity in the minor axis direction. The
04-05-2019
15
arrangement direction to the mounting surface 6 may be set to the same condition as above.
Further, the four speakers 10 included in the speaker system 2 of the present embodiment may
be connected in series or in parallel, or one pair of two speakers 10 connected in parallel may be
connected in series. Also, the four speakers 10 included in the speaker system 2 of the present
embodiment may be those that reproduce monaural signals, or these may be divided into two
sets to reproduce stereo signals.
[0043]
Of course, in the cabinet 3, the top surface 4 facing the ceiling surface 1 may be a polygon
having a triangle or more, and the bottom surface 5 is also a polygon corresponding to the top
surface 4. The attachment surface 6 has an outer dimension smaller than the outer diameter and
forms a pyramidal surface between the top surface 4 and the bottom surface 5, and the outer
shape is a part of the pyramid with the apex facing downward It should just have a shape. The
loudspeakers 10 each having the one thin rectangular diaphragm 15 may be disposed on each of
the pyramidal faces constituting the mounting surface portion 6, and of course, the plurality of
speakers 10 may be disposed on one pyramidal face. If the top surface portion 4 is a polygon
having a hexagonal shape or more, the speaker 10 is not disposed if the three or more speakers
10 are disposed so as to substantially divide one round in the direction in which the mounting
surface portion 6 revolves. There may be a pyramidal surface. Further, the cross-sectional
crossing angle with the ceiling surface 1 of the mounting surface 6 of the cabinet 3 may be about
30 ° to 60 °.
[0044]
Furthermore, the bottom surface portion 5 of the cabinet 3 is not limited to the flat shape as in
the above embodiment, but may be a curved surface including a spherical surface, and
constitutes a curved surface integrated with the mounting surface portion 6 It may be. For
example, the bottom surface 5 and the mounting surface 6 may be a spherical surface defined by
a single radius.
[0045]
In the speaker system 2 or 2a of the above embodiment, inside the cabinet 3 of the speaker
system 2, a radio receiving circuit for converting a received radio signal into an audio signal and
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an amplifier circuit for outputting the amplified audio signal to the speaker 10 Although the
circuit unit 22 including the circuit unit 22 is provided, the circuit unit 22 may not be included.
The audio signal may be supplied to the speaker 10 by another cable, and in some cases, the
audio signal may be supplied via a power line supplying power.
[0046]
Moreover, the speaker system 2 for ceiling installation of the said Example may be comprised not
only in combination with the illuminating device 30 shown in figure but combining with another
illumination component, and may be comprised as a single illuminating device which
incorporates the speaker 10. FIG. The lighting device 30 to be combined may be not only LEDs
but also fluorescent lights, white light bulbs, and other lights.
[0047]
The speaker system 2 for ceiling installation according to the present invention is not limited to
the one applied to a residence or a store as in the case of the above embodiment, but the ceiling
surface 1 of a production facility such as a factory or a tunnel of road etc. The present invention
can also be applied to a ceiling speaker system installed and connected to and engaged with the
lighting socket 1s, a lighting device using the same, and the like.
[0048]
Reference Signs List 1 ceiling surface 1s illumination socket 2 speaker system 3 cabinet 4 top
surface 5 bottom 6 mounting surface 7 recess 9 cushion member 10 speaker 11 voice coil
assembly 12 bobbin 13 voice coil 14 damper 15 plane diaphragm 16 edge 17 frame 18
magnetic Circuit 20 Socket part 21 Connection line 22 Circuit part 30 Lighting device 31
Umbrella part 32 Body part 33 Connection cord 34 Socket
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