JPH10191496

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DESCRIPTION JPH10191496
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrostatic transparent speaker, and more particularly to an electrostatic transparent speaker
used by being attached to the front of a display such as a CRT, LCD, or PDP, or a poster or a
picture. It is.
[0002]
2. Description of the Related Art FIG. 12 is a cross-sectional view showing a conventional
electrostatic speaker that is not an electrostatic transparent speaker. In the figure, 1 is a
transparent diaphragm, 2 is an electrode film formed on the diaphragm 1, 3 is a fixed plate
disposed facing the diaphragm 1, and 5 is a diaphragm that separates the diaphragm 1 from the
fixed plate 3. Insulating spacer frame, and the diaphragm 1 is stretched with a constant tension.
Further, 6 is an air vent hole formed in the diaphragm 3 and formed so as not to disturb the
vibration of the diaphragm 1, and in practice it is formed using a punching metal or the like as
the fixed plate 3 It is a thing. Further, reference numeral 8 is a sound absorbing material, which
is configured to prevent the generation of the sound entering and exiting the air vent 6 and for
the air to be released to the outside. The insulating spacer frame 5 on which the diaphragm 1 is
stretched and the fixing plate 3 provided with the air vent holes 6 are fastened by screws or the
like, but they are attached using a bonding material to constitute an electrostatic type speaker.
ing.
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[0003]
Next, the operation will be described. By applying a constant DC voltage between the diaphragm
1 and the fixed electrode plate 3 and superimposing an acoustoelectric signal, the diaphragm 1 is
displaced in the direction of the fixed electrode 3 by the Coulomb force. Thus, the force received
by the diaphragm 1 changes due to the fluctuation of the acoustoelectric signal, and the
diaphragm 1 vibrates in accordance with the received force to generate the sound wave 12.
[0004]
FIG. 13 shows the cross-sectional structure of the conventional electrostatic transparent speaker
disclosed in Japanese Patent Application Laid-Open No. 59-105800.
In the figure, 1 is a transparent diaphragm, 2 is a transparent electrode film formed on the
transparent diaphragm 1, 3 is a transparent fixed electrode plate, 4 is a transparent electrode
film formed on the fixed electrode plate 3, 5 is an insulation A spacer 11 is a transparent
perforated pressing plate in which a sonic radiation hole 14 is formed. The transparent
diaphragm 1 is tensioned by fastening the perforated pressing plate 11 to the fixed electrode
plate 3 together with the insulating spacer with a screw. For this reason, when the transparent
diaphragm 11 vibrates, the sound wave 12 is emitted through the sound wave emitting hole 14
formed in the hole holding plate 11. In the present invention, the transparent diaphragm 3 and
the perforated pressing plate 11 and the like constitute a transparent electrostatic speaker using
glass or a transparent plastic material.
[0005]
By the way, in recent years, it has been proposed that an electrostatic speaker be attached to the
front of a display such as a CRT, an LCD, a PDP, a poster, a picture, etc. Actually, such use has not
been made yet.) As shown in FIG. 13, the diaphragm 1, the fixed plate 4 and the hole pressing
plate 11 are made of transparent members. However, in the conventional electrostatic speaker
shown in FIG. 12 and FIG. 13 described above, since the fixed electrode 3 seen from the front, the
holding plate 11 and the like have been bored with holes for air removal and sound wave
emission When the main speaker is viewed from the front, the outline of the hole is visible
because the refractive index of light is different between the material and the air, even if the
material is used, the image of the display on the back of the main speaker or a picture The
problem is that it affects the viewer, makes the viewer uncomfortable, and looks bad.
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[0006]
Further, in the conventional electrostatic transparent speaker shown in FIG. 13, the transparent
electrode film 2 formed on the diaphragm 1, the transparent electrode film 4 formed on the fixed
electrode plate 3, and the insulating spacer frame 5 And the air in the closed space 13 is
vibrated, the pressure in the closed space 13 prevents the vibration of the transparent diaphragm
1, and the sound is small. There was also a problem that the output efficiency was poor.
[0007]
Therefore, the present invention has been made to solve such a problem, and even when it is
used by being attached to the front of a display, a picture, etc., it does not affect the image on the
rear side, and it is possible for viewers. An object of the present invention is to provide an
electrostatic transparent speaker which does not give a sense of discomfort and which has high
output efficiency.
[0008]
[Means for Solving the Problems] In order to achieve the above object, in the present invention, a
transparent diaphragm on which a transparent electrode film is formed, and a transparent fixing
on which a transparent electrode film opposed to the transparent diaphragm is formed And an
insulating spacer frame provided between the transparent diaphragm and the transparent fixing
plate to form a closed space together with the transparent diaphragm and the transparent fixing
plate, and the transparent diaphragm and the insulating member from the outside In the
electrostatic type transparent speaker in which the opposite side can be seen through the
transmission area of the transparent fixing plate, it becomes the outside of the extension line
extended onto the transparent fixing plate from the end of the transmission area of the
transparent diaphragm in the closed space. An air vent hole is provided at a position for drawing
air out of the closed space.
[0009]
In the next invention, a support frame is further provided in which a transparent diaphragm is
stretched at a position facing the insulating spacer frame via the transparent diaphragm on the
front surface of the transparent diaphragm.
[0010]
Further, in the next invention, the air vent holes are provided on the side surface of the insulating
spacer frame.
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[0011]
In the next invention, the cross-sectional shape of the insulating spacer frame is such that the
transmission region side end of the contact surface with the transparent diaphragm is formed
inside the transmission region side end of the contact surface with the transparent fixing plate
An air vent is provided at a position on the transparent fixing plate outside the extension line
extended on the transparent fixing plate from the transmission region side end of the contact
surface with the transparent diaphragm of the insulating spacer frame. It is
[0012]
In the next invention, the width of the support frame from the end of the transparent diaphragm
to the direction of the transmission region is larger than the width of the insulating spacer frame
from the end of the transparent diaphragm to the direction of the transmission region. The
support frame and the insulating spacer are formed, and an air vent hole is provided at a position
on the transparent fixing plate which is the outside of the extension line extended from the
transmission region side end of the support frame to the transparent fixing plate. It is
[0013]
Further, in the next invention, the insulating spacer frame forms an air leak hole by combining a
plurality of divided insulating spacers with a gap, and the width of the supporting frame is the
above-mentioned insulating spacer It is more than the width of the frame.
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment
FIG. 1 shows a cross-sectional structure of Embodiment 1 of the electrostatic transparent speaker
according to the present invention.
In the figure, 1 is a transparent diaphragm, 2 is a transparent electrode film formed on the
diaphragm 1, 3 is a transparent fixed plate, 4 is a transparent electrode film formed on the fixed
electrode plate 3, 5a is a transparent diaphragm 1 And an insulating spacer frame which is
provided between the transparent fixing plate 3 and the transparent diaphragm 1 and the
transparent fixing plate 3 to form a closed space 13; 6 is an air escape hole formed on the side
surface of the insulating spacer frame 5a; Is a sound absorbing material.
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In the first embodiment, the transparent diaphragm 1 is stretched by the insulating spacer frame
5a with a constant tension.
The insulating spacer frame 5a is not made of a transparent member, and the transparent
electrode film 1 and the transparent fixing plate 3 are formed by the opening of the insulating
spacer frame 5a.
[0015]
FIG. 2 shows a perspective view of insulating spacer frame 5a of the first embodiment shown in
FIG.
As shown in this figure, a plurality of circular air vents 6 are formed at predetermined intervals
on the side surface of the insulating spacer frame 5a.
[0016]
Next, to describe the operation, when an acoustoelectric signal is applied between the
transparent electrode film 2 and the transparent electrode film 4, the transparent diaphragm 1
provided with the transparent electrode film 2 vibrates due to the fluctuation of the voltage. ,
Sound waves 12 are generated.
At that time, the air in the closed space 13 goes to the sound absorbing material 8 through the
air vent holes 6 formed on the side surfaces of the insulating spacer frame 5 a, and escapes from
the sound absorbing material 8 to the outside of the closed space 13.
For this reason, the output efficiency of the sound wave 12 does not deteriorate.
Also, when looking from the front of the external of the present speaker through the
transmission region of the transparent electrode film 1 and the transparent fixed plate 3 and
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looking to the rear of the present speaker, the air vents 6 are formed on the side surfaces of the
insulating spacer frame 5a. The through hole 6 is provided in the closed space 13 outside the
extension line vertically extended on the transparent fixing plate 3 from the end of the
transmission region of the transparent diaphragm 1, and can hardly be seen from the front.
[0017]
Therefore, according to the electrostatic transparent speaker of the first embodiment, the output
efficiency of the present speaker is not impaired, and the transparent diaphragm 2 and the
transparent fixing plate 4 are viewed through the transmission region from the outside even
when the opposite side is viewed. Since the air holes 6 are hardly visible, even if the device is
mounted on the front of a display, a picture, etc., it does not affect the image on the rear side, nor
does it cause discomfort to the viewer. .
[0018]
Second Embodiment
FIG. 3 shows a perspective view of the main part of the second embodiment of the electrostatic
transparent speaker according to the present invention. In this figure, the transparent electrode
film, the sound absorbing material, etc. are omitted and only the configuration of the main part of
the second embodiment is shown, 1 is a transparent diaphragm, 3 is a transparent fixed plate, 5b
is transparent with the transparent diaphragm 1 It is an insulating spacer frame provided
between the fixed plate 3 and forming a closed space 13 together with the transparent
diaphragm 1 and the transparent fixed plate 3, and stretching the transparent diaphragm 1. This
insulating spacer frame 5 b A plurality of semicircular grooves 9 are provided at predetermined
intervals on the transparent fixing plate 3 side, and an air leakage hole is formed between the
grooves 9 and the surface of the transparent fixing plate 3.
[0019]
Therefore, according to the electrostatic transparent speaker of the second embodiment, as in the
case of the first embodiment, the air vent holes are provided on the side surfaces of the
insulating spacer frame 5b. As in the first aspect, the output efficiency is not impaired, and even
if the apparatus is attached to the front of a display, a picture, etc., it does not affect the image on
the rear side, and the viewer feels uncomfortable. I will not give it.
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[0020]
In the second embodiment, a plurality of semicircular grooves 9 are provided at predetermined
intervals on the transparent fixing plate 3 side of the insulating spacer frame 5b. However, in the
present invention, the semicircular grooves 9 are used. Of course, the grooves 9 may be provided
on the transparent diaphragm 1 side of the insulating spacer frame 5b.
[0021]
Third Embodiment
In FIG. 4, sectional drawing of the principal part of Embodiment 3 of the electrostatic-type
transparent speaker which concerns on this invention is shown.
In this figure, the transparent electrode film, the sound absorbing material, etc. are omitted and
only the cross section of the main part of Embodiment 3 is shown, 1 is a transparent diaphragm,
3a is a transparent fixed plate, 5c is a transparent diaphragm 1 and transparent An insulating
spacer frame provided between the fixed plate 3a and forming the closed space 13 together with
the transparent diaphragm 1 and the transparent fixed plate 3a and stretching the transparent
diaphragm 1, this insulating spacer frame 5c The cross-sectional shape is formed in an L-shape
in which the transmission region side end of the contact surface with the transparent diaphragm
1 is formed inside the transmission region side end of the contact surface with the transparent
fixing plate 3a. Then, the transparent fixing plate 3a is a transparent fixing plate that is the
outside of the extended line vertically extended on the transparent fixing plate 3a from the
transmission region side end of the contact surface of the insulating spacer frame 5c with the
transparent diaphragm 1 When the main speaker is viewed from the front, the air vent hole 6 is
provided at a position hidden by the L-shaped insulating spacer frame 5c.
[0022]
Therefore, according to the electrostatic type transparent speaker of the third embodiment, when
the opposite side of the transparent diaphragm 1 and the transparent fixing plate 3 is seen from
the front of the present speaker, the air vent hole 6 is an insulating spacer. Since the display is
hidden by the frame 5c and disappears, the output efficiency is not impaired as in the case of the
first and second embodiments, and the image on the rear side is used even if the apparatus is
attached to the front of a display, a picture, etc. There is no impact on the viewer and no
discomfort to the viewer.
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[0023]
In the third embodiment, the cross-sectional shape of insulating spacer frame 5c is described as
being formed in the L-shape described above, but in the present invention, the cross-sectional
shape of insulating spacer frame 5c is L-shaped. There is no limitation, and the cross-sectional
shape of the insulating spacer frame 5c is such that the transmission region side end of the
contact surface with the transparent diaphragm 1 is inside the transmission region side end of
the contact surface with the transparent fixing plate 3a. It is sufficient if it is formed, for example,
it may be formed in a wedge shape or the like as the insulating spacer frame 5d shown in FIG.
[0024]
Fourth Embodiment
In FIG. 6, sectional drawing of the principal part of Embodiment 4 of the electrostatic-type
transparent speaker which concerns on this invention is shown.
In this figure, the transparent electrode film, the sound absorbing material, etc. are omitted and
only the cross section of the main part of the fourth embodiment is shown, 1 is a transparent
diaphragm, 3 is a transparent fixed plate, 5 e is a transparent diaphragm 1 and transparent An
insulating spacer frame provided between the fixing plate 3 and the transparent diaphragm 1
and the transparent fixing plate 3 to form a closed space 13; 6 is an air vent hole formed on the
side surface of the insulating spacer frame 5e; 7 is transparent It is a support frame provided so
as to face the insulating spacer frame 5 e via the diaphragm 1 and for stretching the transparent
diaphragm 1.
[0025]
Therefore, according to the electrostatic transparent speaker of the fourth embodiment, as in the
case of the first embodiment, since the air vent holes 6 are formed on the side surfaces of the
insulating spacer frame 5e, the output efficiency can be improved. Not to lose, and even when
used by attaching the device to the front of a display or a picture, it does not affect the image on
the rear side, nor does it cause discomfort to the viewer.
[0026]
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Embodiment 5
FIG. 7 shows a cross-sectional view of the main part of the fifth embodiment of the electrostatic
transparent speaker according to the present invention. In this figure, the transparent electrode
film, the sound absorbing material, etc. are omitted and only the cross section of the main part of
the fifth embodiment is shown, 1 is a transparent diaphragm, 3 is a transparent fixing plate, 5f is
an insulating spacer frame, A plurality of grooves 9 are formed in the insulating spacer frame 5f,
and 7 is a support frame on which the transparent diaphragm 1 is stretched. The support frame
7 is not made of a transparent member like the insulating spacer frame 5f.
[0027]
Therefore, according to the electrostatic transparent speaker of the fifth embodiment, as in the
case of the second embodiment, the air leakage hole is formed between the groove 9 of the
insulating spacer frame 5 f and the surface of the transparent fixing plate 3. In addition, since the
air vents are not visible from the front, the output efficiency is not impaired as in the first to
fourth embodiments, and the apparatus is attached to the front of a display, a picture, etc. Even if
used, it does not affect the image on the back side, nor does it cause discomfort to the viewer.
[0028]
In the fifth embodiment, a plurality of grooves 9 are provided at predetermined intervals on the
transparent fixing plate 3 side of the insulating spacer frame 5f, but in the present invention, the
transparent diaphragm 1 of the insulating spacer frame 5f is used. The grooves 9 may be
provided on the side, and as shown in FIG. 8, the grooves 9 are provided on both sides of the
insulating spacer frame 5 g on the transparent fixed plate 3 side and the transparent diaphragm
1 side. Also good.
[0029]
Sixth Embodiment
FIG. 9 shows a cross-sectional view of the main part of the electrostatic transparent speaker
according to the present invention.
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In this figure, the transparent electrode film, the sound absorbing material, etc. are omitted and
only the cross section of the main part of the sixth embodiment is shown, 1 is a transparent
diaphragm, 3b is a transparent fixed plate, 5h is a transparent diaphragm 1 and transparent An
insulating spacer frame provided between the fixing plate 3 b and the transparent diaphragm 1
and the transparent fixing plate 3 b to form a closed space 13, and 7 is a supporting frame on
which the transparent diaphragm 1 is stretched. In the sixth embodiment, the width of the
support frame 7 from the end of the transparent diaphragm 1 to the direction of the
transmission region is the width of the insulating spacer frame 5 h from the end of the
transparent diaphragm 1 to the direction of the transmission region In order to be larger, that is,
the opening area surrounded and formed inside the support frame 7 has a width smaller than the
opening area similarly formed inside the insulating spacer frame 5 h, In the transparent fixing
plate 3a, the transparent diaphragm 1 and the transparent fixing plate are positioned from the
end on the transmission region side of the support frame 7 to the outside of the extended line
extending vertically on the transparent fixing plate 3a An air vent 6 is formed at a position
hidden by the support frame 7 when the transmission area 3a is viewed.
[0030]
Therefore, according to the electrostatic transparent speaker of the sixth embodiment, even when
the transparent diaphragm 1 and the transparent fixing plate 3a are viewed from the front of the
outside of the present speaker, the air vent holes 6 are hidden by the support frame 7 and can
not be seen Therefore, as in the first to fifth embodiments, the output efficiency is not impaired,
and even if the apparatus is attached to the front of a display, a picture, etc., it does not affect the
image on the rear side. There is no discomfort to the viewer.
[0031]
Embodiment 7
FIG. 10 is a perspective view of the main part of the seventh embodiment of the electrostatic
transparent speaker according to the present invention. In this figure, the transparent electrode
film, the sound absorbing material and the like are omitted and only the cross section of the main
part of the seventh embodiment is shown, 1 is a transparent diaphragm, 3 is a transparent fixing
plate, and 5i is divided into four. Insulating spacer, both ends of which are shorter than the
length and width of the transparent fixing plate 3 and obliquely cut inward and disposed on the
four sides of the transparent fixing plate 3 so as to be transparent fixed It is provided so as to
constitute an insulating spacer frame in which gaps 10 are formed at the four corners of the
plate 3 respectively. Reference numeral 7 denotes a support frame having a width of at least the
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width of the insulating spacer 5i, which is provided so as to face the insulating spacer 5i via the
transparent diaphragm 1, and the transparent diaphragm 1 is stretched. It is. Therefore, in the
seventh embodiment, the gap 10 formed by the transparent diaphragm 1, the insulating spacer
5i and the transparent fixing plate 3 at the four corners of the transparent fixing plate 3 acts as
an air vent, and the upper side thereof is It will be covered by the support frame 7 wider than the
insulating spacer 5i.
[0032]
Therefore, according to the electrostatic type transparent speaker of the seventh embodiment,
even when the transparent diaphragm 1 and the transparent fixing plate 3 are viewed from the
front of the outside of the present speaker, the gap 10 serving as an air vent is hidden by the
support frame 7 In the same way as in the first to sixth embodiments, the output efficiency is not
impaired, and even if the apparatus is attached to the front of a display, a picture, etc., it affects
the image on the rear side. There is no giving and no discomfort for the viewer.
[0033]
In the seventh embodiment, the insulating spacer frame is divided into four insulating spacers 5i,
and both ends of each insulating spacer 5i are formed obliquely inward. In the invention, the
present invention is not limited thereto. For example, as shown in FIG. 11, both ends of the
insulating spacer 5j divided into four are simply made shorter than the longitudinal and lateral
lengths of the transparent fixing plate 3 and both ends are oblique. Alternatively, the gaps 10
may be formed at positions slightly offset from the four corners of the transparent fixing plate 3,
or the insulating spacer frame may be divided into other than four to form a transparent fixing
plate. Of course, it may be provided not only at the four corners of 3 but also at four sides, or at
two corners or at only one or two sides.
[0034]
In each of Embodiments 1 to 7 described above, the insulating spacer frame and the supporting
frame are not transparent, and the opening portion without the insulating spacer frame and the
supporting frame is the transmission region of the transparent diaphragm and the transparent
fixing plate. In the present invention, the transmission region of the transparent diaphragm is
formed by a non-transparent portion provided by coloring the edge of the transparent diaphragm
other than the insulating spacer frame and the support frame, for example. Of course it is good.
[0035]
As described above, in the present invention, when viewed from the outside through the
transparent diaphragm and the transparent fixing plate, the extension is extended from the end
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of the transmission region of the transparent diaphragm onto the transparent fixing plate. At the
position outside the wire, for example, on the side of the insulating spacer frame, or on the
transparent fixed plate hidden by the insulating spacer frame or support frame, etc., provide an
air vent hole for drawing air out of the closed space. Therefore, the air leakage holes do not
impair the output efficiency, and even if the device is attached to the front of a display, a picture,
etc., it does not affect the image on the rear side, and the viewer feels uncomfortable. There is no
way to give
[0036]
Brief description of the drawings
[0037]
FIG. 1 is a cross-sectional view showing a cross-sectional structure of Embodiment 1 of the
electrostatic transparent speaker according to the present invention.
[0038]
FIG. 2 is a perspective view showing an insulating spacer frame 5a of the first embodiment.
[0039]
FIG. 3 is a perspective view showing the main part of Embodiment 2 of the electrostatic
transparent speaker according to the present invention.
[0040]
FIG. 4 is a cross-sectional view showing the main part of Embodiment 3 of the electrostatic
transparent speaker according to the present invention.
[0041]
FIG. 5 is a cross-sectional view showing a modification of the main part of the third embodiment
of the electrostatic transparent speaker according to the present invention.
[0042]
FIG. 6 is a cross-sectional view showing the main part of Embodiment 4 of the electrostatic
transparent speaker according to the present invention.
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[0043]
FIG. 7 is a cross-sectional view showing the main part of a fifth embodiment of the electrostatic
transparent speaker according to the present invention.
[0044]
FIG. 8 is a cross-sectional view showing a modification of the main part of the fifth embodiment
of the electrostatic transparent speaker according to the present invention.
[0045]
FIG. 9 is a cross-sectional view showing the main part of a sixth embodiment of the electrostatic
transparent speaker according to the present invention.
[0046]
FIG. 10 is a perspective view showing the main part of a seventh embodiment of the electrostatic
transparent speaker according to the present invention.
[0047]
<Figure 11> It is the strabismus figure which shows the deformation example of the principal
part of the form 7 of execution of the electrostatic transparent speaker which relates to this
invention.
[0048]
FIG. 12 is a cross-sectional view showing an electrostatic transparent speaker and an electrostatic
transparent speaker.
[0049]
FIG. 13 is a cross-sectional view of a conventional transparent electrostatic transparent speaker.
[0050]
Explanation of sign
[0051]
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Reference Signs List 1 transparent diaphragm, 2 transparent electrode film, 3, 3a transparent
fixed plate, 4 transparent electrode film, 5a, 5b, 5c, 5d, 5e, 5f, 5g insulating spacer frame, 5i, 5j
insulating spacer, 6 Air vents, 7 support frames, 8 sound absorbing materials, 9 grooves, 10
gaps, 12 sound waves, 13 closed spaces.
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