JP2012039553A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker device that makes use of advantages of a thin and flexible electrostatic flat speaker by using the electrostatic flat speaker in conjunction with a conventional speaker.SOLUTION: In a flat speaker panel 9, a flat speaker 22 is placed on a frame body 21 and is covered with a punching panel plate 23. An upper front plate 8 is extended in a longitudinal direction of a case body, and has a lattice shaped framework with a plurality of through holes (sound holes) 8a. A cone speaker 10 is arranged so that its front opening 10a is placed in a left end area of an electronic musical instrument. The flat speaker 22 is arranged on a front surface of the upper front plate 8 across almost the same width as in a key arrangement direction. An opening area facing the front opening 10a of the cone speaker 10 and an opening area facing the flat speaker 22 completely overlap each other.

Description

  The present invention relates to a speaker device that uses both an electrostatic surface speaker and a conventional speaker. As an example, it is used for outputting musical sounds in an electronic keyboard instrument.

A thin surface speaker is known as an electroacoustic transducer. For example, an electrostatic speaker (also referred to as a capacitor speaker) that is driven by applying a voltage between electrodes and using a clonal force, or a device using a film having piezoelectric characteristics is known.
As the area of the flat speaker increases, the directivity of sound increases in the direction perpendicular to the flat plate, and as a result, the sound reaches far.

Among these, a thin-type flexible speaker is recently attracting attention as an electrostatic speaker. Since this is thin and light, and has flexibility, it can be bent, and after bending, no stress remains and it is difficult to return to its original shape (see Patent Documents 1 and 2, etc.).
Utilizing such characteristics, a curtain speaker is realized by connecting a plurality of electrostatic speakers so that they can be bent, and the sound field can be freely controlled (Patent Literature). 2).
However, the arrangement and mounting structure for using a surface speaker such as an electrostatic speaker by utilizing its characteristics have not been sufficiently studied.

JP 2010-68053 A JP 2008-28652 A

  The present invention has been made to solve the above-described problems. By using an electrostatic surface speaker and a conventional speaker in combination, and by devising their arrangement and mounting structure, the present invention is thin and flexible. An object of the present invention is to provide a speaker device that utilizes the characteristics of a certain electrostatic surface speaker.

  According to the present invention, in the invention described in claim 1, in the speaker device, a low-frequency range reproduction speaker (10 in FIG. 1) and a housing (1, 2, 2) for housing the low-frequency range reproduction speaker (10). 3 and 5) and an electrostatic surface speaker (22), and one or a plurality of sound holes (8a) are formed in the plate (8) which is a part of the outer surface of the housing, The low sound range reproduction speaker (10) is disposed so that the front opening (10a) and a part of the opening region by the one or more sound holes (8a) face each other. The surface speaker (22) is disposed so as to face the one or the plurality of sound holes (8a), and has an opening area facing the front opening (10a) of the low sound range reproduction speaker (10), The opening area facing the electrostatic surface speaker (22) is at least partially overlapping. .

An electrostatic surface speaker is a thin speaker that can be regarded as a two-dimensional surface approximately, and has a flat and thin flat plate shape. A curved surface obtained by curving a thin flat plate, an arbitrary curved surface, A surface speaker of an arbitrary form such as a surface speaker having a bent surface is also possible.
The flat electrostatic surface speaker of the flat plate shape generates a plane wave, so that even if the listening position is far from the electronic keyboard instrument, the attenuation is small and it can be heard well. On the other hand, even if the listening position is close, it is not felt noisy.
On the other hand, in the case of a curved surface speaker in which a curved surface is formed, the directivity angle of the sound wave is a wide angle on the convex surface side of the curved surface, and the sound wave is focused on the concave surface side of the curved surface.
However, the sound pressure of the surface speaker is greatly attenuated in the low sound range, and the sound pressure increases as the frequency increases, but the mid-high sound range exhibits a flat frequency characteristic due to area interference. Here, as the area of the surface speaker (the area of the diaphragm) is increased, the sound pressure in the low frequency range is increased by the area. However, there is a limit to the low frequency range reproduction.
In contrast, a conventional speaker, for example, a dynamic (electrodynamic) cone speaker (hereinafter simply referred to as “corn speaker”) does not have a relatively low sound pressure even in a low sound range. In particular, a large-diameter cone speaker called a woofer speaker is suitable for low sound range reproduction. However, the cone speaker does not have sharp directivity, and the sound with the opposite phase output from the back of the diaphragm wraps around the front of the diaphragm. Disturbance is likely to occur.
Therefore, by using an electrostatic surface speaker and a low-frequency range reproduction speaker in combination, the disadvantages of both are compensated. Although the above-described cone speaker is used as the low sound range reproduction speaker, it is not necessarily limited to the woofer speaker, and any speaker that reproduces the low sound range may be used.

When the electrostatic surface speaker and the low frequency range reproduction speaker are used in combination, the opening region facing the front opening of the low frequency range reproduction speaker and the opening region facing the electrostatic type surface speaker are at least partially Therefore, in the housing of the speaker device, the area for arranging the low-frequency range reproduction speaker and the electrostatic surface speaker can be reduced.
Since the electrostatic surface speaker has a film shape and is sound transmissive, sound output from the low sound range reproduction speaker is also output to the front even if the opening regions overlap.

Here, the sound hole (8a) is a through hole through which sound passes. The opening area may be formed by a plurality of sound holes or simply by one large through hole.
The speaker for low sound range reproduction (10) is disposed in a housing inside the plate body (8) which is a part of the outer surface of the housing and in which a sound hole is formed. On the other hand, the electrostatic surface speaker may be disposed on the outer side of the plate body described above, or may be disposed in the housing inside the plate body described above. In the former case, the low-frequency range reproduction speaker faces the above-described plate with an electrostatic surface speaker interposed therebetween.
It is desirable that the surface speaker is disposed so that the front surface or the back surface of the vibration surface and at least half of the opening area by the through-hole are opposed to each other. In other words, the front surface or the back surface of the vibration surface has a sound transmission area. It is desirable to face more than half.
However, even if it is less than half, the sound generated from the front surface or the back surface of the vibration surface only needs to pass through the through hole. If there is a through hole on the front surface of the vibration surface, the sound generated through this through hole is released to the outside. If there is a through hole on the back surface of the vibration surface, the sound generated through this through hole is Since it is released into the interior, there is no air layer on the back surface that reduces the sound pressure in the low frequency range.

According to the present invention, in the invention according to claim 2, in the speaker device according to claim 1, the casing (1, 2, 3, 5 in FIG. 1) is a casing of an electronic musical instrument, The plate body (8) which is a part of the outer surface of the housing is a long body, and the electrostatic surface speaker (22) is elongated along the longitudinal direction of the long body (8). It is arranged on the long body (8) in shape.
By making the plate into a long body, the diaphragm of the electrostatic surface speaker can be expanded, and as the diaphragm spreads, the sound pressure in the low range increases, so the degree of decrease in the sound pressure in the low range is reduced. Get smaller.

According to a third aspect of the present invention, in the speaker device according to the second aspect, the electronic musical instrument (1, 2, 3, 4, 5 in FIG. 1) includes an electronic keyboard. The long body (8) is a front plate of the electronic keyboard instrument, and the low-frequency range reproduction speaker (10) has the front opening (10a) as a key of the keyboard section (4). The electrostatic surface speaker (22) is disposed so as to be located in an end region in the arrangement direction, and the electrostatic surface speaker (22) has a width substantially equal to or substantially the same as a width in the key arrangement direction of the keyboard portion (4). The electronic keyboard instrument is disposed over the entire width of the electronic keyboard instrument.
Here, the reason for prescribing that “substantially the same width” is that when the electrostatic surface speaker is attached to the outer frame, the width of the vibration area of the surface speaker is narrower than the outer frame. This is because when the frame is matched with the width of the keyboard portion (4) in the key arrangement direction, the width of the vibration area of the electrostatic surface speaker is slightly narrower than the width of the keyboard portion (4) in the key arrangement direction.
The reason why it is defined as “less than the full width of the left and right sides of the casing of the electronic keyboard instrument” is that there is a sense of incongruity when the width of the electrostatic surface speaker is expanded to the left and right of the casing of the electronic keyboard instrument.
The electronic keyboard instrument has a long width in the key arrangement direction of the keyboard part. Therefore, the area of the surface speaker can be increased by arranging the surface speaker so that one side of the surface speaker is along the key arrangement direction like the front panel of the electronic keyboard instrument. At the same time, the design (appearance) of the instrument does not need to be unique and there is no sense of incongruity.

In addition, since the plane wave emitted from the electrostatic surface speaker has a sharp directivity, the surface speaker that can be heard by the performer is located at the upper front of the keyboard. Therefore, if an electrostatic surface speaker is disposed on the upper front plate located at the upper front, even if it is a small area, the propagation efficiency is good for the performer because of the sharp directivity.
When a lower front plate is provided between the left and right legs under the shelf of the instrument body, like an upright electronic keyboard instrument, an electrostatic surface speaker is provided on the lower front plate. However, the diaphragm of the electrostatic surface speaker can be expanded.
Since the electrostatic surface speaker is arranged over the same width as or more than the width of the keyboard in the key arrangement direction, it expands to the left and right as viewed from the performer. Therefore, the electrostatic surface speaker can be divided into left and right to make a stereo speaker.
On the other hand, when only one low-frequency range reproduction speaker is used, the front opening is arranged on the low-frequency range side in the key arrangement direction, so that it can be changed from the low-frequency range of the keyboard according to the key depression in the low-frequency range of the keyboard. Sounds like a musical tone is generated. In addition, when another low-frequency range reproduction speaker is used, two low-frequency range reproduction speakers can be used as stereo speakers by disposing the low-frequency range reproduction speaker on the high frequency range side in the key arrangement direction.

In the cited description of each claim mentioned above, the reference numerals in parentheses attached to “Matters for specifying the invention” are “Matters for specifying the invention” in “Mode for carrying out the invention” described later. ”Is a symbol given to those corresponding to“ ”. This code merely indicates a correspondence between “matter for specifying the invention” and an example thereof. “Matter for specifying the invention” is not limited to an example associated with this code.
In the inventions described in the above-mentioned claims, an electrostatic speaker is used as the surface speaker. However, not only the electrostatic speaker but also a surface speaker such as a piezoelectric film type can be used.

  According to the present invention described above, the combined use of the electrostatic surface speaker and the conventional low-frequency range reproduction speaker expands the total reproduction range, and the combined use of them does not require an extra arrangement space. effective.

1 is an external view of a portable synthesizer type electronic keyboard instrument that is an embodiment of the present invention. FIG. It is the 1st explanatory view showing the surface speaker attachment structure in the embodiment shown in FIG. It is a 2nd explanatory drawing which shows the surface speaker attachment structure in embodiment shown in FIG. It is the 1st explanatory view showing other specific examples of the surface speaker attachment structure in the embodiment shown in FIG. It is the 2nd explanatory view showing other specific examples of the surface speaker attachment structure in the embodiment shown in FIG. FIG. 2 is a structural diagram of an electrostatic surface speaker that is a specific example of the surface speaker in the embodiment shown in FIG. 1. FIG. 7 is a partial plan view showing a second specific example of the electrostatic surface speaker shown in FIG. 6. FIG. 7 is a partial plan view showing a third specific example of the electrostatic surface speaker shown in FIG. 6. FIG. 7 is a partial plan view showing a fourth specific example of the electrostatic surface speaker shown in FIG. 6. It is a functional block diagram of the electronic keyboard musical instrument in the embodiment shown in FIG.

FIG. 1 is an external view of a portable synthesizer type electronic keyboard instrument according to an embodiment of the present invention.
FIG. 1A is a perspective view, and FIG. 1B is a schematic diagram of a vertical cross section as viewed in the direction of arrow X from the cutting line of FIG.
In FIG. 1A, 1 is a side plate (side portion), 2 is a top plate (roof portion), 3 is a bottom plate (bottom portion), and 4 is a keyboard portion. 5 is an upper front part. In addition to the side surface plate 1, the side surface portion includes an upper front portion 5, a rear inclined plate 2b, a lower rear plate 3c, and a lower front plate 3d. The upper front portion 5 has an upper front plate 8.

A side plate (side portion) 1, a top plate (roof portion) 2, a bottom plate (bottom portion) 3, and an upper front plate 8 serve as a casing of the electronic musical instrument. What has the keyboard part 4 and the internal space 14 is a musical instrument main body part.
The instrument main body includes an electronic circuit block (musical signal generator) 13 that generates a musical tone signal by a user's key operation on the keyboard unit 4.
Here, the top plate 2 is formed with one or a plurality of horizontally long linear holes 2a only in the front left region, that is, the low sound region of the keyboard on the upper surface thereof. Each linear hole 2a is paired with a linear plate 2c lowered one step, and the linear hole 2a becomes a through hole (sound hole). Strictly speaking, a gap between the linear hole 2a and the linear plate 2c becomes a through hole (sound hole). Operation panels 6a and 6b are provided on the left and right sides of the top plate 2 near the center, and a display 7 and an operation panel 6c are provided in the rear center. The display 7 displays musical sound parameters, automatic performance song names, and musical scores in order to set operation of the electronic keyboard instrument.
As shown in FIG.1 (b), the back of the top plate 2 becomes the back inclination board 2b. The bottom plate 3 is obtained by assembling a front inclined bottom plate 3b and a lower rear plate 3c with respect to the substrate 3a. The front inclined bottom plate 3b is integrally formed with the lower front plate 3d.

The side surface portion of the instrument main body has an upper front portion 5 between the top plate 2 (roof portion) and the keyboard portion 4, and a surface speaker 22 is disposed on the upper front plate 8 of the upper front portion 5. .
As shown in FIG. 1 (b), the surface speaker panel 9 forms one surface of a housing, and a surface speaker 22 is stretched on a frame 21, and the surface speaker 22 is covered with a punching panel plate 23. is there.
In this embodiment, the surface speaker panel 9 is attached to the front surface of the upper front plate 8 so that the surface speaker 22 is disposed in a part of the instrument main body.
Since the plane wave emitted from the surface speaker 22 has a sharp directivity, the arrangement of the surface speaker 22 that can be heard by the performer is the upper front portion 5. Therefore, since the height of the upper front portion 5 is low, the propagation efficiency is good for the performer even when a large area cannot be secured.

The upper front plate 8 is a long body extending in the left-right direction of the casing, and has a lattice-like framework in which one or a plurality of through holes (sound holes) 8a through which sound passes are formed. Details will be described later with reference to FIGS. In the example described later, almost the entire surface of the upper front plate 8 is the lattice portion 8b.
In addition, the cone speaker 10 is disposed in the left region of the instrument main body in the upper front portion 5 described above.

The surface speaker 22 is disposed at a position that separates the internal space 14 of the electronic musical instrument housing from the outside world, and the sound output from the surface speaker 22 propagates to both the internal space 14 and the outside world.
At the position where the surface speaker 22 is disposed, the sound output from the front surface of the surface speaker 22 is emitted to the outside through the punching panel plate 23. In addition, the sound output from the back surface of the surface speaker 22 propagates to the internal space 14 through the many through holes 8a of the upper front plate 8, and vibrates the housing portion, for example, the top plate 2 and the substrate 3a. Thus, sound is secondarily emitted to the outside world, or the internal space 14 is propagated to the outside world from a plurality of linear holes 2a etc. that are open to the outside world.

The keyboard frame 4a of the keyboard section 4 is mounted on the board 3a and the front inclined bottom plate 3b, and the keyboard frame 4a is reinforced by vertical ribs 4b provided below the keyboard between a predetermined key and its adjacent keys. The key 4c and the black key 4d are supported.
The cone speaker 10 is attached to a frame plate 11 erected on the substrate 3a, and the direction of the central axis CC of the front opening 10a is diagonally forward. Accordingly, the front opening 10a faces the back surface of the upper front plate 8 and the plurality of linear holes 2a described above. The lower part of the upper front plate 8 is supported by the frame plate 11 by the holding member 12.

  In the illustrated example, the central axis CC of the front opening 10a faces upward at about 45 degrees with respect to the horizontal line. As the central axis CC approaches the vertical direction, a sound output from the back surface of the cone speaker 10 (a sound having a phase opposite to that output from the front opening portion 10a) is also output from the upper front portion 5, and the front opening portion. This is not preferable because it causes phase interference with the sound of 10a and the output of the sound directly propagated to the performer decreases. In addition, about the sound output from the back surface of the cone speaker 10 output from the linear hole 2a of the top plate 2, there is not much influence in a player's position.

The surface speaker panel 9 and the cone speaker 10 are disposed on the front surface and the back surface of the upper front plate 8 with the upper front plate 8 interposed therebetween.
The cone speaker 10 is disposed such that a front opening 10a thereof faces a part of an opening region formed by one or a plurality of through holes 8a. In other words, the front opening 10 a faces a part of the sound transmission area which is the sum of the areas of the plurality of through holes 8 a in the upper front plate 8. In the illustrated example, the front opening 10 a is disposed so as to be positioned in the left end region of the instrument main body in the key arrangement direction of the keyboard 4.

On the other hand, the surface speaker 22 of the surface speaker panel 9 is disposed so that its vibration surface and more than half of the opening region by the one or more through holes 8a face each other. In other words, the back surface of the surface speaker 22 is opposed to more than half of the sound transmission area described above.
In the illustrated example, the surface speaker 22 has a shape elongated along the longitudinal direction of the upper front plate 8, and is formed on the front surface of the upper front plate 8 over the same width as the width of the keyboard portion 4 in the key arrangement direction. It is arranged. There are time signatures 4e and 4f on both sides of the keyboard part 4, and the width of the keyboard part 4 including the time signatures 4e and 4f in the key arrangement direction is substantially the same as that of the surface speaker 22.
Therefore, since the area of the surface speaker 22 can be increased by increasing the width of the surface speaker 22, the sound pressure in the low sound range is increased, so that the degree of decrease in the sound pressure in the low sound region is reduced.

The surface speaker panel 9 and the cone speaker 10 overlap each other when viewed from the performer side. Therefore, the opening area facing the front opening 10a of the cone speaker 10 and the opening area facing the surface speaker 22 at least partially overlap. In the example shown, it overlaps completely. Since the electrostatic surface speaker 22 has a film shape and is sound transmissive, sound output from the cone speaker 10 is also output to the front even if the opening regions overlap.
The surface speaker 22 and the cone speaker 10 described above output sounds according to the musical sound signal output from the electronic circuit block (musical sound signal generation unit) 13.

The surface speaker 22 emits sound from the front and back. In the surface speaker 22, the air spring of the air layer on the back and the diaphragm resonate, and the sound pressure decreases at a frequency lower than the resonance frequency. Here, the resonance frequency becomes higher as the air layer on the back surface is thinner. Therefore, when the surface speaker 22 is disposed on the outside of the plate body (upper front plate 8 in the drawing), an air layer having a sufficient thickness needs to be formed on the back surface of the surface speaker 22. The air layer should be 1cm, and 3cm is enough.
However, if one or a plurality of through holes 8a are formed in the plate (upper front plate 8), the sound output from the back surface of the surface speaker 22 can be released to the internal space 14 side of the housing. Even if the air layer on the back side of the surface speaker 22 is thin, it compensates for this and prevents the resonance frequency described above from becoming too high.
The sound emitted from the front opening 10 a of the cone speaker 10 passes through the surface speaker 22 and is emitted to the front surface, and is also emitted from the linear hole 2 a of the top plate 2.

In addition, a surface speaker may be arrange | positioned at the front inclination bottom board 3b of a bottom board (bottom part), and may be arrange | positioned at the back inclination board 2b. The lower rear plate 3c shown in the figure has two upper and lower stages before and after that, and a surface speaker may be provided on the rear upper bottom plate 3e which is the upper stage. A large number of through holes (sound holes) can be formed in the front inclined bottom plate 3b, the rear inclined plate 2b, and the rear upper bottom plate 3e to provide a surface speaker. The surface speakers may be disposed at a plurality of locations. Further, the surface speaker may be disposed outside the casing of the electronic musical instrument or may be disposed inside the casing.
On the other hand, the cone speaker 10 may be disposed on the substrate (shelf plate) 3a or may be disposed at a plurality of locations of the electronic musical instrument.

FIG. 2 is a first explanatory view showing the surface speaker mounting structure in the embodiment shown in FIG.
2A is a partially enlarged view of the vertical cross section shown in FIG. 1B, and FIG. 2B is a perspective view showing the mounting structure of the holding member 12. FIG.
In the illustrated example, the upper front plate 8 is formed integrally with the top plate 2. The upper front plate 8 as a whole has a lattice portion 8b in which a plurality of through holes 8a are formed, and attachment holes 8c and 8d are formed in a peripheral region of the lattice portion 8b.

The lower part of the upper front plate 8 is folded forward and has a stepped portion 8e. The lower surface of the stepped portion 8e is attached to the holding member 12 with a screw member (not shown).
The holding member 12 is bent at a right angle vertically at the front portion thereof, and the lower portion thereof is horizontally cut and raised to form a mounting portion 12a, in which a screw hole 12b for mounting the upper front plate 8 is formed. .
At the rear part, the holding member 12 is bent at a right angle vertically and has an attachment part 12c. An attachment hole 12d for attaching the holding member 12 to the frame plate 11 shown in FIG. 1B is formed. Yes.

The frame body 21 of the surface speaker panel 9 is a support body for the surface speaker 22 having a large rectangular opening 21a at the center. Engagement protrusions are formed at two or more locations in the key arrangement direction of the keyboard portion 4 on the back side of the upper edge portion and the lower edge portion. As shown in FIG. 3 in an enlarged manner, the engaging protrusion includes an elastic deformation portion 21b and a locking portion 21c, and an elastic deformation portion 21e and a locking portion 21f.
The surface speaker 22 extends from the front surface of the frame body 21 to the back surface of the frame body 21 around the upper and lower edges of the frame body 21 and is fixed to the frame body 21 with an adhesive or the like.
The upper end portion 23 a of the punching panel plate 23 draws a curved surface along the upper curved surface of the frame body 21, is bent at a right angle along the front end surface of the top plate 2, and then touches the front surface of the upper portion of the frame body 21. It is bent like this. The screw member 25 is screwed into the screw hole 23 b of the folded portion of the surface speaker 22 and the punching panel plate 23 through the attachment hole 21 d of the frame body 21.
On the other hand, the lower end portion 23c of the punching panel plate 23 is bent at a right angle from the front surface of the frame body 21 to which the surface speaker 22 is fixed. The upper surface of the lower end portion 23c overlaps the bottom surface bt (see FIG. 3) of the surface speaker 22 in a state where the mounting portion 23d is in contact with the surface speaker 22.

FIG. 3 is a second explanatory view showing the mounting structure of the surface speaker panel 9 in the embodiment shown in FIG.
The frame member 21 and the surface speaker 22 are screwed to the upper end portion 23a of the punching panel plate 23 shown in FIG.
A mounting portion 23d of the punching panel plate 23 is formed by cutting and raising from the lower end portion 23c, and a screw hole 23e is formed therein. The screw member 33 is screwed into the screw hole 23e of the punching panel plate 23 through the frame body 21 and the surface speaker 22 from the mounting hole 21g. As a result, the lower end portion 23 c of the punching panel plate 23 becomes the bottom surface of the surface speaker panel 9.
The punching panel plate 23 described above only needs to protect the surface speaker 22 and transmit sound. The punching panel plate 23 may be a material in which a net is stretched on a frame (not shown) or a synthetic resin plate material. The speaker grille in which a through hole (sound hole) is formed.

The above-described surface speaker panel 9 (FIG. 3) has its engaging projections (elastically deforming portion 21b and locking portion 21c, elastically deforming portion 21e and locking portion 21f), respectively. Attaching portion 8c (FIG. 2), 8d (FIGS. 2 and 3). When the locking portions 21c and 21f are pushed into the front surfaces of the mounting holes (engaging portions) 8c and 8d, the elastic deformation portions 21b and 21e are bent, and the locking portions 21c and 21f pass through the mounting holes 8c and 8d. By slightly returning the bending of the elastically deforming portions 21b and 21e, the locking portions 21c and 21f are engaged and fixed to the corners on the back of the mounting holes 8c and 8d. A lower end portion 23 c of the punching panel plate 23, which is the bottom surface of the surface speaker panel 9, is placed on the step portion 8 e of the upper front plate 8.
In this way, the surface speaker panel 9 can be easily attached and fixed to the upper front plate 8. Further, there is an effect that the flickering of the frame body 21 due to the vibration of the surface speaker 22 does not occur due to the elasticity of the elastic deformation portions 21b and 21e described above.

Here, the locking portions 21c and 21f mean engagement members on the side attached to the housing, and the engaging portions (attachment holes 8c and 8d) mean engagement members on the housing side. The attachment holes 8c and 8d described above are examples of the engagement portion, and the engagement portion is not necessarily limited to the attachment hole.
In the example shown in the figure, there are elastic deformation portions 21b and 21e on the side of the locking portion to constitute the engaging protrusion. However, there may be an elastic deformation part on the side of the engaging part. For example, on the upper front plate 8 side, the engagement protrusions (elastic deformation portion and engagement member) having the same shape as the above-described engagement protrusions (elastic deformation portion 21b and locking portion 21c, elastic deformation portion 21e and locking portion 21f). This is a case in which mounting holes having the same shape as the mounting holes 8c and 8d described above are provided on the frame body 21 side. Further, there may be elastic deformation portions on both the locking portion side and the engaging portion side.

  In the example shown in the drawing, the vibration isolating member 31 is attached in the key arrangement direction on the end of the surface speaker 22 at the side where the back surface and the upper side surface of the surface speaker panel 9 contact. On the other hand, on the side where the back surface and the bottom surface of the surface speaker panel 9 are in contact with each other, a vibration isolating member 32 is attached in the key arrangement direction on the end of the surface speaker 22 in the illustrated example. These anti-vibration members 31 and 32 are, for example, anti-vibration rubber members, and after the surface speaker panel 9 is mounted on the upper front plate 8, the surface speaker panel 9 is inadvertently vibrated. Do not let go or come off.

The above-described surface speaker panel 9 can also be removed.
In FIG. 2, there is a slight gap between the linear hole 2a and the linear plate 2c in the vicinity of the engaging portion between the locking portion 21c and the mounting hole 8c described above (near enough to act on the engagement). Is formed. Insert a long and narrow tool such as a flat-blade screwdriver 24 here, push down the engaging portion 21c of the engaging protrusion, bend the elastically deforming portion 21b, and release the engagement between the engaging portion 21c and the mounting hole 8c, The locking portion 21c is pulled out from the mounting hole 8c.
Thereafter, the surface speaker panel 9 is lifted upward, so that the engagement between the engaging portion 21f of the lower engaging projection and the mounting hole 8d is released. In this manner, the engaging projections of the frame body 21 can be detached from the mounting holes 8c and 8d, and the surface speaker panel 9 can be removed from the upper front plate 8.
The surface speaker panel 9 is provided with engaging portions at a plurality of locations in the key arrangement direction. In the engagement part where the linear hole 2a is not in the vicinity, a through hole into which the tool is inserted is formed in the top plate 2 (not shown).

  The surface speaker 22 described above may receive a monaural signal. However, since the surface speaker 22 is long in the key arrangement direction, it is attached to the upper front plate 8 as the surface speaker panel 9 divided into the surface speaker 22L for the left channel and the surface speaker 22R for the right channel, or the surface speaker panel. 9 itself may be divided into a left channel and a right channel, and attached to the upper front plate 8. At this time, the cone speaker 10 in the left area shown in FIG. 1A may be disposed also in the right area of the upper front portion 5 to be a stereo speaker.

In the above description, the drive current is supplied to the surface speaker 22 by connecting the input line drawn from the surface speaker 22 and the output line of the drive circuit in the electronic circuit block 13 using a connector such as a plug or a socket. What is necessary is just to connect electrically.
At that time, a plurality of plugs for electrical connection are formed on the frame body 21 separately from the engaging protrusions (elastically deforming portions 21b and 21e, locking portions 21c and 21f) described above, and the above-described description is made. A plurality of sockets for electrical connection may be formed on the upper front plate (support) 8 separately from the attachment holes (engagement portions) 8c, 8d. In this case, in a state where the engagement protrusion and the mounting hole are mechanically engaged, the electrical contacts of the plurality of plugs and the electrical contacts of the plurality of sockets come into contact with each other electrically. Connected.

Alternatively, as described below, the above-described engaging protrusions (elastically deforming portion 21b, locking portion 21c, elastically deforming portion 21e, locking portion 21f) and mounting holes 8c and 8d are electrically contacted respectively. In addition to the engagement protrusion and the mounting hole being a mechanical coupling member, an electrical connector (plug and socket) can also be provided.
The surface speaker 22 has three electrodes. Therefore, the surface speaker panel 9 has at least three engaging protrusions as plugs for monaural and at least six engaging protrusions for stereo.

4 and 5 are explanatory views showing other specific examples of the surface speaker mounting structure in the embodiment shown in FIG. In the figure, the same parts as those in FIGS.
FIG. 4A is a partially enlarged view of the upper portion of the frame body 21 shown in FIG. The surface speaker 22 is not shown. FIG. 4B is a vertical cross-sectional view of FIG. 4A, and the vertical cross-section is viewed in the X direction. In addition, a part of the surface speaker 22, the top plate 2, and the upper front plate 8 is described. is doing.

In FIG. 4A, the engaging protrusions (elastically deforming portion 21b, locking portion 21c) become plugs. A through hole 21i is formed in the inclined surface 21h of the locking portion 21c and communicates with the groove 21j of the elastic deformation portion 21b. The groove 21j communicates with a shallow groove 21k formed on the upper end surface of the frame body 21.
Reference numeral 41 denotes a conductive elastic member, which is a flat plate member having bent portions 41a, 41c, 41e and valleys 41b, 41d between them. The peaks 41a and 41c are triangular, the valleys 41b and 41d are flat, and the peaks 41e are curved.
In this conductive elastic member 41, the peak portion 41c is inserted into the groove 21j, the peak portion 41e is fitted into the shallow groove 21k, and the peak portion 41a is press-fitted and fixed to the through hole 21i. The valley portions 41b and 41d leave a gap between the bottom surface of the groove 21j.

On the other hand, the mounting hole 8c of the upper front plate 8 shown in FIG. A conductive member 42 is provided at the upper corner on the back side of the mounting hole 8c. The conductive member 42 is bent twice at a right angle, and is fixed to the top plate 2 by a screw member 43 on the back surface of the top plate 2.
When the locking portion 21c of the engaging protrusion described above is engaged with the mounting hole 8c, the second peak 41c of the conductive elastic member 41 contacts the conductive member 42, and the conductive member 42 is caused by its elastic force. Press. As a result, when the upper portion of the frame body 21 is engaged with the upper front plate 8, a pair of connection terminals are electrically connected in the above-described one engaging portion.
The peak portion 41 e of the conductive elastic member 41 is connected to one electrode of the surface speaker 22 by being in surface contact with the connection terminal 22 a of the surface speaker 22. On the other hand, the conductive member 42 is connected to the electronic circuit block 13 shown in FIG.

The elastic deformation portion 21b remains elastic during engagement, and the upper surface (the side having the groove 21j) of the elastic deformation portion 21b presses the upper surface of the mounting hole 8c (the lower surface of the top plate 2). .
Therefore, it is possible to design so that the upper surface of the elastic deformation portion 21b does not contact the upper surface of the mounting hole 8c during the engagement, so that the conductive elastic member 41 only presses the conductive member 42. In this case, the engagement state is maintained by both elastic forces of the elastic deformation portion 21 b and the conductive elastic member 41.
Alternatively, the conductive elastic member 41 may be replaced with a mere conductive member whose elastic deformation can be ignored, and the replaced member may be in a state of being in contact with and pressing the conductive member 42 only by the elasticity of the elastic deformation portion 21b. it can.

FIG. 5A is a partially enlarged view of the lower portion of the frame body 21 shown in FIG. Illustration of the surface speaker 22 is omitted. In order to clarify the illustration of the conductive elastic member 51 to be described later, the outline of the engagement protrusion (elastic deformation portion 21e, locking portion 21f) is indicated by a one-dot chain line, and the conductive elasticity hidden behind the engagement protrusion. The outline of the member 51 is shown by a solid line.
FIG. 5B is a vertical cross-sectional view of FIG. 5A, and the vertical cross-section is viewed in the X direction. In addition, a part of the surface speaker 22 and the upper front plate 8 is described.
In the figure, the same parts as those in FIG.

In FIG. 5A, the engaging protrusions (elastically deforming portion 21e, locking portion 21f) become plugs. A through hole 21m is formed in the inclined surface 21L of the locking portion 21f, and communicates with the groove 21n of the elastic deformation portion 21e. The groove 21 n communicates with the through hole of the frame body 21, and an opening 21 o is formed on the front surface of the frame body 21.
Reference numeral 51 denotes a conductive elastic member having a contact structure portion and a terminal portion structure portion. The contact structure portion includes trough portions 51a and 51c, a crest portion 51b between the trough portions 51a and 51c, and a crest portion 51d following the trough portion 51c. The trough portions 51a and 51c are triangular, and the crest portions 51b and 51d are flat. The end of the peak 51d is bent vertically and is connected to the terminal structure.
The terminal portion structure is formed wider than the width of the peak portion 51d, and the end portions 51e and 51f in the width direction are formed in a “U” shape by being bent toward the contact structure portion described above. And the rectangular piece 51g is cut and raised from the width direction center part to the contact structure part side. An attachment hole 51h and an engagement protrusion 51i are formed on the rectangular piece 51g.

The conductive elastic member 51 is inserted from the opening 21o described above. The trough portion 51a, the crest portion 51d, the trough portion 51c, and the crest portion 51b are inserted into the groove 21n of the elastic deformation portion 21e, and the trough portion 51a is press-fitted and fixed to the through hole 21m. The crest portions 51b and 51d have a gap between the ceiling surface of the groove 21n.
The end portions 51e and 51f are fitted into the vertical groove 21p of the frame body 21 and, as will be described later, by screwing the screw member 52 to the frame body 21 from the mounting hole 51h, the conductive elastic member 51 is framed. 21 is fixed.

On the other hand, the mounting hole 8d of the upper front plate 8 shown in FIG. A conductive member 53 is provided at the lower corner portion on the back side of the mounting hole 8d. The conductive member 53 is bent at a right angle and fixed on the back surface of the upper front plate 8 by a screw member 54.
When the locking portion 21f of the engaging protrusion described above engages with the mounting hole 8d, the second valley portion 51c of the conductive elastic member 51 contacts the conductive member 53, and the conductive member 53 is caused by its elastic force. Press. Thus, when the lower part of the frame 21 of the surface speaker panel 9 is engaged with the upper front plate 8, a pair of connection terminals are electrically connected in the one engaging portion described above.

The elastic deformation portion 21e of the engagement protrusion remains elastic even during engagement, and the lower surface (the side having the groove 21n) of the elastic deformation portion 21e presses the lower surface of the mounting hole 8d.
Therefore, it is possible to design so that the lower surface of the elastic deformation portion 21e does not come into contact with the lower surface of the mounting hole 8d during engagement so that the conductive elastic member 51 only presses the conductive member 53. In this case, the engaged state is maintained by both elastic forces of the elastic deformation portion 21e and the conductive elastic member 51.
Alternatively, the conductive elastic member 51 may be replaced with a mere conductive member that can ignore elastic deformation, and this may be in a state of contacting and pressing the conductive member 53 only by the elasticity of the elastic deformation portion 21e.

In the terminal portion structure, the connection terminal 22b of the surface speaker 22 is inserted into the gap between the end portions 51e and 51f and the rectangular piece 51g. The connection terminal 22b is formed with an attachment hole 22c and an engagement hole (may be an engagement recess) 22d shown in FIG.
By positioning the engagement hole 22d and the engagement protrusion 51i, the positioning of the attachment hole 22c and the attachment hole 51h is facilitated. By screwing the screw member 52 to the frame body 21 from the surface speaker 22, the mounting hole 22c, and the mounting hole 51h, the conductive elastic member 51 is fixed to the frame body 21, and at the same time, the connection terminal 22b of the surface speaker 22 is connected. Makes contact with the rectangular piece 51 g of the conductive elastic member 51, whereby the conductive elastic member 51 is connected to one electrode of the surface speaker 22.
On the other hand, the conductive member 53 is connected to the electronic circuit block 13 shown in FIG.

FIG. 6 is a structural diagram of a flexible surface speaker 60, which is a specific example of the surface speaker 22 in the embodiment shown in FIG.
6A is a schematic diagram showing the laminated structure of the surface speaker 60 opened, FIG. 6B is a partial plan view of the surface speaker 60, FIG. 6C is a partial cross-sectional view of the surface speaker 60, and FIG. FIG. 6D is a partial cross-sectional view illustrating another example of the surface speaker 60.

First, the main part of the laminated structure will be described.
In FIG. 6A to FIG. 6C, a first sound transmitting property is provided between the first fixed electrode sheet 62 having sound transmitting property and the second fixed electrode sheet 66 having sound transmitting property. A vibrating electrode sheet (vibrating film) 64 that is particularly thin and flexible is laminated and disposed via the insulating sheet 63 and the second insulating sheet 65 having sound permeability.
The first insulating sheet 63 and the second insulating sheet 65 are thin and flexible buffer materials (cushion materials). The first fixed electrode sheet 62 and the second fixed electrode sheet 66 described above are also thin and flexible.
The sound output from the front surface of the vibrating electrode sheet 64 passes through the first insulating sheet 63 and the first fixed electrode sheet 62 and is emitted from the front surface of the electrostatic speaker. The sound output from the back surface passes through the second insulating sheet 65 and the second fixed electrode sheet 66 and is emitted from the back surface of the electrostatic speaker.

61 is a third insulating sheet having sound transmission, 67 is a fourth insulating sheet having sound transmission, and these protect and waterproof the back of the electrostatic speaker, It is also a cover to prevent electric shock. These are also flexible.
Therefore, the surface speaker 60 is a flexible, thin and flexible electrostatic speaker as a whole.
Except for the vibrating electrode sheet 64 described above, the other first fixed electrode sheet 62, second fixed electrode sheet 66, first insulating sheet 63, second insulating sheet 65, and third insulating sheet 61. The fourth insulating sheet 67 has air permeability. The third insulating sheet 61 and the fourth insulating sheet 67 can be omitted.

68a to 68e and 69a to 69e are adhesive layers for partially supporting the vibrating electrode sheet 64 by the first insulating sheet 63 and the second insulating sheet 65, and the width thereof is narrow. For example, the thickness is 4 to 10 [mm], there is flexibility, and the thickness is thin, for example, 0.1 to 0.5 [mm]. In the illustrated example, the adhesive layer has a tape shape, and specifically, a double-sided adhesive tape is used.
The vibrating electrode sheet 64 is supported by the adhesive layers 68a to 68e and 69a to 69e with a space therebetween.
By virtue of the adhesive layers 68a to 68e and 69a to 69e, the vibrating electrode sheet 64 is between the first insulating sheet 63 and the vibrating electrode sheet 64 in a region where the adhesive layers 68a to 68e and 69a to 69e are not provided. In addition, the second insulating sheet 65 is supported slightly apart.

Since the vibrating electrode sheet 64, the first insulating sheet 63, and the second insulating sheet 65 have flexibility, there is no problem even if they are in contact with each other. The first insulating sheet 63 and the second insulating sheet 65 support the vibrating electrode sheet 64 and apply appropriate elastic stress to the vibrating electrode sheet 64.
The adhesive layers 68a to 68e and 69a to 69e are not essential for the electrostatic surface speaker. However, the vibrating electrode sheet 64 vibrates integrally with the first insulating sheet 63 and the second insulating sheet 65 having a buffering action while interacting with each other.
Therefore, the adhesive layers 68 and 69 have a function of stabilizing the interaction between the vibrating electrode sheet 64, the first insulating sheet 63, and the second insulating sheet 65, rather than a spacer. The adhesive layers 68 and 69 also serve to prevent each layer of the laminated sheet formed in a multilayer shape from being damaged or to prevent wrinkles by shifting when the entire surface speaker 60 is folded.

In FIG. 6C, the vibration electrode sheet 64 is supported by the first insulating sheet 63 at the first support positions at equal intervals by the adhesive layers 68a to 68e, and the adhesive layers 69a to 69e Two insulating sheets 65 are supported at the same first support position. The interval between the first support positions was 1 [cm] to 10 [cm], and 3.6 [cm] in the prototype.
In FIG. 6D, the vibrating electrode sheet 64 is supported by the first insulating sheet 63 at the first support position at equal intervals by the adhesive layers 68f and 68g, and the adhesive layers 69f and 69g Two insulating sheets 65 are supported at second support positions at equal intervals. Since the first support position and the second first support position are alternately arranged, the vibrating electrode sheets 64 are supported alternately.

  As shown in FIGS. 6B and 6C, the end portion (right end portion in the drawing) of the surface speaker 60 is preferably supported by adhesive layers 68e, 69e, 68h, and 69h. At the peripheral portion of the surface speaker 60, the layers of the sheets are adhered to each other with an adhesive layer (double-sided adhesive tape) similar to the adhesive layers 68e, 69e, 68h, 69h, or an adhesive is applied to the layers. Keep away from. The peripheral portion of the surface speaker 60 is stitched, combined with a synthetic resin, or attached to a frame (not shown).

The above-described vibrating electrode sheet 64 is formed by depositing a conductive metal such as aluminum or applying a conductive paint on both surfaces or one surface of a synthetic resin thin film such as polyethylene terephthalate (PET) or polypropylene (PP). The thickness is several [μm] to several tens [μm].
The first fixed electrode sheet 62 and the second fixed electrode sheet 66 described above are formed by depositing a conductive metal such as aluminum on one or both sides of polyethylene terephthalate, or applying a conductive paint. This is a punching metal in which a large number of through holes 62a and 66a penetrating the thickness are formed. In this prototype, the thickness is 0.5 [mm].
The first fixed electrode sheet 62 and the second fixed electrode sheet 66 may be made of a wire mesh instead of punching metal, or a non-woven fabric obtained by vapor deposition of aluminum. In the latter case, the third insulating sheet 61 and the first fixed electrode sheet 62 can be integrated, and the fourth insulating sheet 67 and the second fixed electrode sheet 66 can be integrated.
The first insulating sheet 63 and the second insulating sheet 65 described above are, for example, foamed synthetic resin or nonwoven fabric.
The third insulating sheet 61 and the fourth insulating sheet 67 described above are also, for example, foamed synthetic resin or non-woven fabric, but have a high degree of freedom in material selection.

FIG. 7 is a partial plan view showing a flexible electrostatic surface speaker 70 which is another example of the surface speaker 22 in the embodiment shown in FIG.
In FIG. 6, the adhesive layers 68a to 68e and 69a to 69e are arranged in parallel with each other in the vertical direction of the drawing. In addition, in FIG. 7, adhesive layers 71a, 71b, 71c are arranged in parallel in the illustrated horizontal direction.
The illustrated adhesive layers 71a and 71b are arranged at the same intervals as the adhesive layers 68a to 68d and 69a to 69d.
If one grid-like adhesive layer is used instead of the two types of adhesive layers arranged in the vertical direction and the horizontal direction, the thickness of the adhesive layer becomes uniform.
Since the laminated cross-sectional structure of the surface speaker 70 is the same as that shown in FIGS. 6C and 6D except for the arrangement of the adhesive layer, the illustration is omitted.

In the example shown in FIGS. 6 and 7, the vibration electrode sheet 64 and the first insulating sheet 63, and the vibration electrode sheet 64 and the second insulating sheet are formed by the adhesive layers 68 a to 68 h, 69 a to 69 h, and 71 a to 71 c. 65 was adhered.
In addition to these, the interlayer between the third insulating sheet 61 and the first fixed electrode sheet 62, the interlayer between the first fixed electrode sheet 62 and the first insulating sheet 63, and the second insulating sheet 65. Adhesive layers (double-sided adhesive tape) are bonded between the layers between the first fixed electrode sheet 66 and the second fixed electrode sheet 66 and between the second fixed electrode sheet 66 and the fourth insulating sheet 67. May be. In particular, in the peripheral portion of the surface speaker 40, all the layers may be bonded with an adhesive layer (double-sided adhesive tape).

By doing in this way, the integrity as a laminated body increases, a gap is not formed between layers, and a layer does not shift. It is sound transmission that the bonding position by the double-sided adhesive tape (not shown) matches the supporting positions of the adhesive layers 68a to 68h, 69a to 69h, 71a to 71c shown in FIGS. This is desirable in order not to lower the rate.
However, the bonding position may be different depending on the layer. Moreover, the selection of the one-dimensional parallel arrangement arranged in the vertical direction and the one-dimensional parallel arrangement arranged in the horizontal direction orthogonal thereto can be changed depending on the interlayer.

FIG. 8 is a partial plan view showing electrostatic surface speakers 80A and 80B having flexibility, which is still another example of the surface speaker 22 in the embodiment shown in FIG.
In this specific example, the surface speaker 60 having the laminated sectional structure shown in FIG. 6 is formed as one unit, and a plurality of units arranged at intervals are formed as one surface speaker 80A or 80B. is there.
That is, the surface speakers 80A and 80B are laminated sheets that are divided into a plurality of units and a connecting portion that connects adjacent units among the plurality of units.
In FIG. 8A, a plurality of surface speaker units are arranged one-dimensionally, and in FIG. 8B, a plurality of surface speaker units are arranged two-dimensionally (vertically and horizontally).

In FIG. 8A, the electrostatic surface speaker units 81 _{1 to} 81 ₅ have the laminated sectional structure shown in FIG. 6C or 6D, and serve as the vibration surface of the surface speaker 80A. . On the other hand, in the region of the connecting portion 82 of the speaker unit, the conductive layers (the first fixed electrode sheet 62, the vibrating electrode sheet 64, the second fixed electrode) shown in FIG. There is no sheet 66) and only the insulating layer (the third insulating sheet 61, the first insulating sheet 63, the second insulating sheet 65, the fourth insulating sheet 67) is left, and these are connected. Part 82 is configured.

In the region of the connecting portion 82, the first insulating sheet 63 and the second insulating sheet 65 may be omitted. In this case, first, as the speaker units 81 _{1 to} 81 ₅ , the first fixed electrode sheet 62, the first insulating sheet 63, the vibrating electrode sheet 64, the second insulating sheet 65, the second stationary electrode sheet 66, and the adhesive layer 68a~68h, 69a~69h, advance to create a layered structure of 71a~71c advance, the upper surface and the lower surface of these surfaces speaker units 81 ₁ to 81 _5, the third The surface speaker 80 </ b> A can be formed by covering with the insulating sheet 61 and the fourth insulating sheet 67. In this case, the third insulating sheet 61 and the fourth insulating sheet 67 constitute the connecting portion 82.
If manufactured by such a process, even if the area of each of the surface speaker units 81 _{1 to} 81 ₅ is small, the surface speakers 80A and 80B having a large area can be obtained.

Since there is no layer of the first and second fixed electrode sheets 62 and 66 and a layer of the vibrating electrode sheet 64 in the connecting portion 82, the electrode sheet is damaged even if the connecting portion 82 is bent or folded. Absent.
Here, the layer of the insulating sheet existing in the connecting portion 82 is continuously present from the same layer in the adjacent unit. In other words, these layers are continuous layers that are common to all units and connections. For this reason, in order to provide the connecting portion, there is no need to provide another connecting member or to join this another connecting member to an adjacent unit by stitching or adhesion.

8B, each of the surface speaker units 83 _{1 to} 83 ₄ has the same laminated structure as the surface speaker units 81 _{1 to} 81 ₅ shown in FIG. 6A, and the vibration surface of the surface speaker 80B. Become. In this specific example, the surface speaker units 83 _{1 to} 83 ₄ are connected in the horizontal direction by the connecting portion 84a and connected in the vertical direction by the connecting portion 84b. The stacked structure of the connecting portions 84a and 84b is the same as that of the connecting portion 82 shown in FIG.
Furthermore, the peripheral portions 84c of the electrostatic speaker units 83 _{1 to} 83 ₄ are also formed in a laminated structure without a conductive layer, like the connecting portions 84a and 84b, so as to be a region to which a frame (not shown) is attached.

The above-described surface speaker units 81 _{1 to} 81 ₅ in FIG. 8A and the surface speaker units 83 _{1 to} 83 ₄ in FIG. 8B connect lead wires to the electrodes of each unit, and connect these lead wires to each electrode. Each unit is connected to the drive circuit independently. Alternatively, in the connecting portions 82, 84a, and 84b, corresponding electrodes of adjacent units may be connected by a short lead wire, and each electrode of each unit may be connected to the drive circuit by a common lead wire.

FIG. 9 is a plan view showing a fourth specific example of the electrostatic surface speaker having flexibility shown in FIG.
9A is a plan view showing the back side of the surface speaker 90, FIG. 9B is a plan view showing the back side of the surface speaker with the arrangement of the conductive adhesive layer in FIG. 9A, and FIG. 9 (c), (d), and (e) are cross-sectional views as viewed in the direction of arrows XX, YY, and ZZ in FIG. 9 (b), respectively. In the figure, parts similar to those in FIG. The adhesive layers 68a, 69a, 68b, 69b and the like are extended in the vertical direction in the drawing, similarly to FIG.
As shown in FIG. 9 (a), this surface speaker 90 has two surface speaker units 90L and 90R arranged on the left and right for stereo. Since the left and right structures are symmetrical, the same reference numerals are given to the left and right components, and only the right surface speaker unit 90R will be described. Since it is a rear view, the surface speaker unit 90R is shown on the left side. The area between the surface speaker units 90L and 90R is a connection part 90C similar to the connection part 82 shown in FIG. 8, and the peripheral part of the combination of the surface speaker units 90L and 90R is an area to which a frame (not shown) is attached. Become.

9 (b) and 9 (c) is a strip-shaped first conductive adhesive layer between the first fixed electrode sheet 62 and the third insulating sheet 61. The speaker is extended to the left half of the upper edge of the surface speaker 90, and the two are bonded together. A conductive adhesive layer is implement | achieved by what apply | coated the electroconductive adhesive on both surfaces of electroconductive adhesive itself or a metal foil tape.
9 (a), 9 (b) and 9 (d) is a first flexible printed circuit board (hereinafter referred to as FPC) 92, which is the back surface of the insulating film (in FIG. A conductive foil 92d. A copper foil tape can be used in place of the FPC.
The FPC 92 (FIG. 9 (d)) is in the same layer as the first conductive adhesive layer 91 (FIG. 9 (c)) and extends from the one end of the upper edge of the surface speaker unit 90R in the vertical direction. Established. The one end 91a of the first conductive adhesive layer 91 and the conductor foil 92d at the one end 92a of the first FPC 92 are overlapped and bonded at a part of the upper edge of the surface speaker unit 90R. The other end of the first FPC 92 extends downward, penetrates from the second fixed electrode sheet 62 to the fourth insulating sheet 67, and becomes the first connection terminal 92b. Reference numeral 92c denotes a mounting hole for connecting to a terminal of the plug.

Reference numeral 93 shown in FIGS. 9B and 9D denotes a belt-like second conductive adhesive layer, which is located between the first insulating sheet 63 and the vibrating electrode sheet 64 and is a surface speaker. The left edge of the unit 90R (the right side of the first FPC 92) extends in the vertical direction, reaches a part of the lower edge, and bonds them together.
Reference numeral 94 denotes a second FPC, in which a conductive foil (not shown) is attached to the back surface (upper surface in the drawing) of the insulating film. The second FPC 94 is in the same layer as the second conductive adhesive layer 93 and is provided at a part of the lower edge of the surface speaker unit 90R. The one end portion 93a of the second conductive adhesive layer 93 and the conductor foil at the one end portion 94a of the second FPC 94 are overlapped and bonded at a part of the lower edge of the surface speaker unit 90R. The other end of the second FPC 94 penetrates from the vibrating electrode sheet 64 to the fourth insulating sheet 67 and becomes the second connection terminal 94b.
The second connection terminal 94b extends downward at the end, and an attachment hole 94c is formed therein. Here, for example, an insulating coating is provided on the conductor foil of the second FPC 94 so that the second FPC 94 does not short-circuit with the second fixed electrode sheet 66 when it penetrates these layers.

Reference numeral 95 denotes a belt-like third conductive adhesive layer, which is between the fourth insulating sheet 65 and the second fixed electrode sheet 66 and extends in the vertical direction from the right edge of the surface speaker unit 90R. Then it reaches a part of the lower edge and bonds them together.
Reference numeral 96 denotes a third FPC, which is provided in the same layer as the third conductive adhesive layer 95 and provided at the lower edge of the surface speaker unit 90R. As shown in FIG. 9 (e), the conductor foil 96d at one end portion 95a of the third conductive adhesive layer 95 and the one end portion 96a of the third FPC 96 overlaps at a part of the lower edge of the surface speaker unit 90R. Glued.
The other end of the third FPC 96 penetrates through the second fixed electrode sheet 66 and the fourth insulating sheet 67 and becomes the third connection terminal 96b. The third connection terminal 96b extends downward at the end, and an attachment hole 96c is formed therein.

The first to third conductive adhesive layers 91, 93, 95 and the first to third FPCs 92, 94, 96 are arranged at the peripheral edge so as not to disturb the vibration of the surface speaker unit 90R. Has been. The first to third connection terminals 92b, 94b, 96b are all arranged at equal intervals on the lower edge of the surface speaker unit 90R.
Engaging protrusions (locking portions 21f, elastically deforming portions 21e) and attachment holes 8d shown in FIG. The first to third connection terminals 92b, 94b, and 96b are all connection terminals 22b that are inserted into the gaps between the end portions 51e and 51f of the conductive elastic member 51 and the rectangular piece 51g, as shown in FIG. Screwed to the rectangular piece 51g of the conductive elastic member 51.
The surface speaker 90 shown in FIG. 9 uses the engaging protrusions (the elastically deforming portion 21b and the locking portion 21c) shown in FIG. It is not necessary to use an engaging projection that also serves as the plug shown.

FIG. 10 is a functional block diagram of the electronic keyboard instrument in the embodiment shown in FIG.
The operation of each white key and black key in the keyboard unit 4 shown in FIG. 1 is detected by the detection unit 101, and a detection signal is output to the control unit 102. The control unit 102 outputs the performance data to the sound source unit 103. This performance data includes data such as key press and key release timing, note number (pitch), velocity (key press speed), and aftertouch amount corresponding to the key pressed or released. . The control unit 102 described above is realized by causing the CPU to execute a device incorporation program.

The electronic keyboard instrument shown in FIG. 1 is provided with operation panels 6a, 6b and 6c, and a plurality of operators (buttons and knobs) 104 are arranged on these. As the operation element 104, there are, for example, a switch for setting operation such as a musical instrument tone color, a switch for controlling selection of music for automatic performance, start of playback, stop of playback, and the like.
The operation of the operation element 104 is detected by the detection unit 101 and output to the control unit 102, and the control unit 102 sets the function assigned to each operation element to the electronic keyboard instrument. In the case of setting for the sound source unit 103, sound source setting data is output to the sound source unit 103.

The electronic keyboard instrument described above includes an automatic performance unit 105 and a song data storage unit 106. The automatic performance unit 105 reads the music stored in the music data storage unit 106 by operating the operator, and outputs performance data in MIDI (Musical Instrument Digital Interface) format to the control unit 102. The automatic performance unit 105 described above is also realized by causing the CPU to execute a device incorporation program.
The MIDI interface 107 inputs performance data in MIDI format supplied from a personal computer or other electronic musical instrument from a terminal provided on the lower rear panel 3 c and outputs it to the control unit 102.

The tone generator 103 receives stereo tone (two channels, L and R) tone signals according to the performance data input from the controller 102, and tone and tone settings corresponding to the key press operation. And output to the amplifiers 108L, 108R, 110L, 111L, and 111R. The illustrated sound source unit 103 uses a stereo left source and a right source for generating one musical sound. These sound source sources are stored in a sound source waveform memory (not shown).
The sound source unit 103 may be a monaural source, and may control a left / right volume ratio (sound image localization control) in accordance with an operated key band or the like.

The outputs of the amplifiers 108L and 108R are output to external output terminals 109L and 109R for headphones, respectively. The output of the amplifier 110L is output to the cone speaker 10 shown in FIG. When the cone speaker 10 in the left region shown in FIG. 1 is also disposed in the right region of the upper front portion 5, the output of the R channel of the sound source unit 103 is sent to the right region via an amplifier (110R) (not shown). Is output to a cone speaker arranged in
The outputs of the amplifiers 111L and 111R are output to the primary coils of the step-up transformers 112L and 112R, respectively. A flexible surface speaker 22 constituting the surface speaker panel 9 shown in FIG. 1 is connected to the secondary coils of the step-up transformers 112L and 112R.
In the illustrated example, the surface speaker 90 is divided into the surface speaker unit 90L for the left channel and the surface speaker unit 90R for the right channel shown in FIG.
The secondary coil of the step-up transformer 112L has a midpoint tap CT, and a series circuit of a high-voltage bias DC power supply 113L and a high-resistance resistor 114L is connected to the midpoint tap CT. Both ends of the secondary coil described above are terminals 115L and 116L, and the other end of the resistor 114L is a terminal 117L.

As the terminals 115L, 116L, and 117L, connectors (conductive elastic member 51, conductive connection members 21f, elastic deformation portions 21e, attachment holes 8d) described with reference to FIG. 5 are electrically connected. What also serves as the conductive member 53) is used.
The terminal 115L is connected to the first fixed electrode sheet 62 shown in FIG. 6 via the first conductive thin plate 92 and the conductive adhesive layer 91. Similarly, the terminal 116L is connected to the second fixed electrode sheet 66, and the terminal 116L is connected to the vibration electrode sheet 64.

As described above, if six connectors (plugs and sockets) that are independent and spaced from each other are used for each terminal (one circuit) of the terminals 115L to 117L, when connecting the plug and the socket, The operator's finger is less likely to touch multiple circuits on the output line at the same time.
Of course, a high voltage is usually applied to the output line only when the surface speaker panel is attached to the support. However, even if a high voltage is output between the output lines at the time of connection work, the electric shock of the connection worker can be prevented.

  The terminals 115L, 116L, and 117L of the surface speaker unit 90L may be common connectors (plugs and sockets) each having three terminals (three circuits). In addition, a common connector having six terminals (six circuits) common to the surface speaker units 90L and 90R including the terminals 115R, 116R, and 117R may be used.

Here, the principle of operation of the electrostatic surface speaker will be described using the vibrating electrode sheet 64 as a reference for potential. By the bias DC power supply 113L, the first fixed electrode sheet 62 and the second fixed electrode sheet 66 are negatively charged with E ₀ = several hundred [V], and the vibrating electrode sheet 64 and the first fixed electrode sheet 62 are And between the vibrating electrode sheet 64 and the second fixed electrode sheet 66, electrostatic attraction forces in opposite directions are generated.
In this state, when a music signal ± e [V] (e is a value sufficiently smaller than E ₀ ) having an opposite phase is applied to the first fixed electrode sheet 62 and the first fixed electrode sheet 66, the first The fixed electrode sheet 62 and the second fixed electrode sheet 66 are negatively charged at (E ₀ + e) [V] and (E ₀ −e) [V], respectively. As a result, the balance of electrostatic attraction force between the electrodes of the vibrating electrode sheet 64 and the first fixed electrode sheet 62 and between the vibrating electrode sheet 64 and the second fixed electrode sheet 66 is lost, and as a result, An electrostatic attraction force proportional to the musical tone signal e [V] is generated, and the vibrating electrode sheet 64 is push-pull driven in accordance with the positive / negative of the musical tone signal e [V].
In the above description, the surface speaker unit 90L has been described. However, the surface speaker unit 90R is the same, and the description is omitted.

In the above description, the output of the amplifier 110L is directly output to the cone speaker 10. However, in order to supply a musical sound signal according to the frequency characteristics of the cone speaker 10, it is desirable to insert a low-pass filter circuit on the input side or output side of the amplifier 110L.
Similarly, a high-frequency or middle-high-pass filter circuit for supplying a tone signal corresponding to the frequency characteristic of the surface speaker unit 90L to the step-up transformer 112L may be inserted on the input side or output side of the amplifier 111L. Good.
The characteristics of the filter circuit described above are designed so that the sound output from the cone speaker 10 and the sound output from the surface speaker unit 90L are balanced on the frequency characteristics.

Furthermore, a tweeter speaker (for example, a dome type dynamic speaker) for high-frequency reproduction may be provided, and the amplifier 110L may distribute the musical sound signal to the tweeter speaker. A switch for selectively switching between the surface speaker unit 90L and the tweeter speaker and using either one may be provided.
Although not shown, the sound source unit 103 may be provided with dedicated sources (two systems of L and R) for the surface speaker units 90L and 90R. In this case, the tone signal based on this dedicated source is amplified by the amplifiers 111L and 111R and supplied to the step-up transformers 112L and 112R.
When the above-described surface speaker 90 is not divided into the left and right channels, the monaural signal is supplied from the sound source unit 103 to be amplified and output to the step-up transformer. Alternatively, a mixing unit that mixes the stereo output of the sound source unit 103 is provided, and the output of the mixing unit is amplified and output to the step-up transformer.

DESCRIPTION OF SYMBOLS 1 ... Side plate, 2 ... Top plate, 2a ... Linear hole, 2b ... Rear inclined plate, 2c ... Linear plate, 3 ... Bottom plate, 3a ... Substrate, 3b ... Front inclined bottom plate, 3c ... Lower back plate, 3d ... Lower front plate, 3e ... rear upper bottom plate, 4 ... keyboard part, 4a ... keyboard frame, 4b ... vertical rib, 4c ... white key, 4d black key, 4e, 4f ... time signature, 5 ... upper front part, 6a, 6b, 6c ... Operation panel, 7 ... Display, 8 ... Upper front plate, 8a ... Through hole, 8b ... Lattice part, 8c, 8d ... Mounting hole, 8e ... Step part, 9 ... Surface speaker panel, 10 ... Cone speaker, 10a ... Front opening, 11 ... Frame plate, 12 ... Holding member, 12a ... Mounting portion, 12b ... Screw hole, 12c ... Mounting portion, 12d ... Mounting hole, 13 ... Electronic circuit block, 14 ... Internal space, 21 ... Frame, 21a ... opening, 21b ... elastic deformation part, 21c ... locking part, 21d ... mounting hole, 21e ... bullet Deformed portion, 21f ... locking portion, 21g ... mounting hole, 21h ... inclined surface, 21i ... through hole, 21j ... groove, 21k ... shallow groove, 21L ... inclined surface, 21m ... through hole, 21n ... groove, 21o ... opening Part, 21p ... Vertical groove,
22, 22 L, 22 R... Surface speaker, 22 a, 22 b .. connection terminal, 22 c .. mounting hole, 22 d .. engagement hole, 23 .. punching panel plate, 23 a. Mounting part, 23e ... Screw hole, 24 ... Slotted screwdriver, 25 ... Screw member, 31, 32 ... Anti-vibration member, 33 ... Screw member, 41 ... Conductive elastic member, 41a, 41c, 41e ... Mountain part, 41b, 41d ... trough part, 42 ... conductive member, 43 ... screw member, 51 ... conductive elastic member, 51a, 51c ... trough part, 51b, 51d ... peak part, 51e, 51f ... end part, 51g ... rectangular piece, 51h ... Mounting hole, 51i ... engaging protrusion, 52 ... screw member, 53 ... conductive member, 54 ... screw member,
60... Surface speaker, 61... 3rd insulating sheet, 62... 1st fixed electrode sheet, 62a... Through hole, 63 ... 1st insulating sheet, 64 ... Vibration electrode sheet, 65. Sheet, 66 ... second fixed electrode sheet, 66a ... through hole, 67 ... fourth insulating sheet, 68a to 68h, 69a to 69h ... adhesive layer,
70 ... surface speaker, 71a, 71b, 71c ... adhesive layer,
80A, 80B ... plane speaker, 81 _{1 to} 81 ₅ ... plane speaker unit, 82 ... connecting portion, 83 _{1 to} 83 ₄ ... plane speaker unit, 84a, 84b ... connecting portion, 84c ... peripheral portion,
90... Plane speaker, 90L, 90R... Plane speaker unit (electrostatic surface speaker), 90C... Connecting portion, 91, 93, 95... First to third conductive adhesive layers, 91a, 93a, 95a. , 92, 94, 96 ... first to third FPCs (flexible printed circuit boards), 92a, 94a, 96a ... one end, 92b, 94b, 96b ... connection terminals, 92c, 94c, 96c ... mounting holes, 92d, 96d ... conductor foil,
DESCRIPTION OF SYMBOLS 101 ... Detection part, 102 ... Control part, 103 ... Sound source part, 104 ... Manipulator, 105 ... Automatic performance part, 106 ... Music data storage part, 107 ... MIDI interface, 108L, 108R, 110L amplifier, 109L, 109R ... External 110L, 111L, 111R ... amplifier, 112L, 112R ... step-up transformer, 113L, 113R ... bias DC power supply, 114L, 114R ... resistor, 115L, 115R, 116L, 116R, 117L, 117R ... terminal

Claims (3)

A low-frequency range reproduction speaker, a housing for accommodating the low-frequency range reproduction speaker, and an electrostatic surface speaker;
In the plate body that is a part of the outer surface of the housing, one or more sound holes are formed,
The low-frequency range reproduction speaker is disposed so that the front opening and a part of the opening region by the one or more sound holes are opposed to each other.
The electrostatic surface speaker is disposed so as to face the one or more sound holes,
The opening area facing the front opening of the low frequency range reproduction speaker and the opening area facing the electrostatic surface speaker at least partially overlap.
A speaker device characterized by that. The housing is a housing of an electronic musical instrument,
The plate body that is a part of the outer surface of the housing is a long body,
The electrostatic surface speaker has a shape elongated along the longitudinal direction of the elongated body and is disposed on the elongated body.
The speaker device according to claim 1. The electronic musical instrument is an electronic keyboard instrument having a keyboard part,
The elongated body is a front plate of the electronic keyboard instrument,
The bass reproduction speaker is disposed such that the front opening is located in an end region of the keyboard portion in the key arrangement direction,
The electrostatic surface loudspeaker is disposed over substantially the same width as the width of the keyboard portion in the key arrangement direction, or over the entire width of the casing of the electronic keyboard instrument exceeding the substantially same width.
The speaker device according to claim 2.

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