JPH11234793A - Thin profile flat speaker unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin profile flat speaker unit that is used as an enclosure- less speaker compatible with a full range at a low cost, with light weight and thin profile that is excellent in a low sound frequency characteristic and adopts an edge-less and frame-less structure. SOLUTION: The thin profile flat speaker unit 60 adopts an edge-less and frame-less structure consisting of a driver section 2 forming a magnetic circuit comprising a plate 6 and a magnet 3, a voice coil bobbin 5 on which a voice coil 1 is wound, a support member 42 that connects and supports the coil bobbin to the driver section, a diaphragm 51 of nearly a circular shape the takes the vice coil bobbin as its center axis and outfitted to an outer circumferential face of the voice coil bobbin nearly perpendicularly, and a weight 54 placed along the outer circumferential edge of the diaphragm. The diaphragm is divided into a center side part 51a and an outer circumferential part 51b around the voice coil bobbin with a ring shaped flexible vibration border area 56. The diaphragm is vibrated splittingly at the center side part and the outer circumferential part with a node of the vibration border area 56 and then the low sound frequency characteristic is enhance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new structure of a dynamic speaker unit in the field of high-fidelity audio, and more particularly, to a full-range ultra-thin planar speaker unit having a frameless / edgeless structure and excellent in low range characteristics not combined with an enclosure. About.

[0002]

2. Description of the Related Art At present, the mainstream of dynamic speaker units for Hi-Fi reproduction is of the moving coil type. In particular, a dynamic cone speaker unit having a structure as shown in FIG. Almost.

In FIG. 6, a dynamic cone speaker unit 20 has a driver section 2 constituting a magnetic circuit composed of plates 6, 7 and a magnet 3 fixed thereto, and a voice coil 1 for generating a driving force. A voice coil bobbin 5, a substantially conical cone diaphragm 11 connected to the tip of the voice coil 1,
A damper 12 (usually a corrugation damper formed by impregnating resin into a gas-permeable cloth and heating and pressing the same to maintain a predetermined position with respect to the gap of the driver section 2. ), An edge 14 for supporting the outer peripheral edge of the cone diaphragm 11, and a frame 10 for connecting and holding these members.
Reference numeral 4 denotes a pole piece, reference numeral 8 denotes a center cap, reference numeral 15 denotes a gasket, reference numeral 16 denotes a terminal, and reference numeral 17 denotes a terminal.
Is the Kinshi Line.

As described above, a dynamic cone loudspeaker in which the shape of a diaphragm, which is a radiator, is substantially conical (cone type) is hardly deformed due to vibration even if a relatively weak material is used for the diaphragm, and voices are not generated. It is the most widely used because it can effectively transmit coil vibrations with a simple structure.

The rigidity of the cone diaphragm 11 is desirably high, and the piston motion (a state in which the entire diaphragm moves back and forth just like the voice coil) is the most ideal vibration state. If the rigidity is low, split vibration (undulating vibration) occurs. Conventionally, in order to prevent this splitting vibration, the cone diaphragm is made of metal or plastic mixed with carbon is used to increase rigidity, and the cone diaphragm is divided by corrugation (concentric folds). Vibration was suppressed.

[0006] On the other hand, from a different point of view, the divided vibration itself is essentially the same as the vibration of the soundboard of the musical instrument, so that a divided vibration is generated and a sound other than the original sound is slightly mixed in the reproduced sound. It is questionable to deny this. It is thought that the generation of an appropriate divided vibration can be a round and natural sound quality element depending on the device.

Generally, the dynamic cone speaker unit 20 as described above is housed in an enclosure (box) to constitute a speaker system. However, the cone diaphragm 11 is originally of a cone (cone) type (generally, the opening angle is generally approximately (90 degrees), the unit itself has a considerable thickness, and when housed in an enclosure, the thickness of the entire system requires at least 10 cm or more even in a thin bass reflex cabinet. In order to expand the bass range, the dimensions of the speaker unit and the enclosure (cabinet) must be increased.

If the dynamic cone loudspeaker unit is used as an enclosure-less type, the sound pressure before and after the loudspeaker causes a drop in sound pressure particularly in a low-frequency range, making it difficult to achieve a full range. For example, in FIG. 7, the horizontal axis represents the frequency (Hz), the vertical axis represents the sound pressure level (dB), and the acoustic characteristics of the bass reflex 3-way speaker system (curve A) and the acoustics of the enclosureless woofer speaker unit. As is clear from the comparison diagram of the characteristics (curve B), the characteristic is 500 Hz or less, especially 100 Hz.
It can be seen that there is a remarkable difference in the bass range characteristics below Hz.

On the other hand, when it is considered that the speaker unit is for general household use, it is difficult to place a large speaker unit in a small room. There is a strong demand for an excellent full-range dynamic speaker. Further, there is a demand for the development of an ultra-thin cabinetless (enclosureless) speaker compatible with a thin television such as a liquid crystal television or a plasma display television.

[0010]

At present, there is a condenser speaker system as a thin planar speaker.
This capacitor loudspeaker system is completely different in principle from the above dynamic loudspeaker, applies a high-voltage DC bias (forming electrode voltage) of 500 to several thousand volts to a metal-deposited vibrating film facing a fixed electrode plate, and outputs a signal voltage. Is raised to several hundreds of volts and generates an oscillating sound wave that is close to a spherical wave due to the ± charge inquiries on both sides.It has excellent characteristics, but has a very unique structure and is expensive. There is.

The weak point of the condenser speaker system is that the driving force is weaker than that of the dynamic type, and it is difficult to obtain a large amplitude. In some cases, the radiation efficiency of the region is reduced, and practicality may be lost.

Also, in the full range, it becomes considerably large,
Since a small-sized one has poor acoustic characteristics in a low frequency band, a subwoofer is separately required as a speaker system.

On the other hand, in a dynamic speaker,
In the cone type described above, the vibration surface of the cone diaphragm is about 9
Since they are circumferentially opposed at an opening angle of 0 degrees, sound waves from the vibrating surface interfere with each other in the concave space, and severe unevenness appears on the frequency characteristic (cavity effect). Has also been developed. This flat speaker unit has an advantage that an ideal piston motion vibration region is widened in terms of fidelity as a plate-shaped diaphragm made of a lightweight and highly rigid material.

The above-mentioned flat type has a filling type dynamic speaker 30 shown in FIG.
Plate type dynamic speaker 4 shown in (c)
The plate-type dynamic speakers 40 and 50 require a special planar diaphragm 32 having a honeycomb structure, and the plate-type dynamic speaker 40 shown in FIG. 2B has a sub-cone 36 (conical sub-cone for vibration transmission). And several connecting rods, and the dynamic speaker 50 shown in FIG.
However, there is a problem that the effect of maintaining the piston motion cannot be improved unless driven by the above-mentioned method.
The conical hollow portion 8 is filled with a urethane foam material 37, and the overall shape does not become thin as shown in the figure. Reference numeral 33 denotes a surface skin material,
Carbon graphite or thin film plastic.

In any case, the flat type has a heavier diaphragm than the cone type, and the load on the edge and the damper increases. Moreover, it is not worth the cost in terms of cost. In addition, the fact that the outer peripheral edge is regulated by the edge is the same as that of the cone type, and since it is housed in the enclosure and used, it cannot be said that it is very thin.

As described above, the conventional high-fidelity speaker units have advantages and disadvantages, and a light-weight, ultra-thin, full-range type speaker unit, particularly a speaker unit having excellent characteristics in a low-frequency range, has not been realized. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a thin, flat speaker unit having a completely novel vibration structure capable of supporting a full range with a good bass range characteristic while being a lightweight and ultra-thin flat speaker. I will provide a.

[0018]

According to the present invention, there are provided: (1) a voice coil bobbin wound with a voice coil and driven by a driver unit constituting a magnetic circuit; and the voice coil bobbin connected to and supported by the driver unit. A support member, a substantially circular diaphragm externally fixed substantially perpendicularly to the outer peripheral surface of the voice coil bobbin with the voice coil bobbin as a central axis, and a weight attached along the outer peripheral edge of the diaphragm. A vibrating plate having a frame-less and edge-less structure, wherein the diaphragm is divided into a center-side portion and an outer-peripheral-side portion by a ring-shaped flexible vibration boundary region centered on the voice coil bobbin. A flat planar speaker unit, wherein the plate vibrates separately at a center portion and an outer peripheral portion with the vibration boundary region as a node. To solve the above problem by subjecting.

(2) The thin flat speaker unit according to the above (1), wherein a plurality of folds extending in the radial direction from the center in the radial direction are continuously provided on the diaphragm. By doing so, the above problem is solved.

(3) In the above (1) or (2), the vibration boundary region has a structure in which a plurality of through holes are formed in the diaphragm in a ring shape around the voice coil bobbin. The above problem is solved by providing the thin flat speaker unit described above.

(4) The above-mentioned (1), wherein a flexible reinforcing member is attached to the vibration boundary region.
Alternatively, the above problem is solved by providing a thin planar speaker unit according to (2) or (3).

(5) Further, a plurality of support members for connecting and supporting the voice coil bobbin to which the diaphragm is attached with respect to the driver portion are attached in an overlapping manner. The above object is achieved by providing a thin planar speaker according to any of the above.

Here, the shape of the diaphragm is a conventional cone (cone) type (usually, the opening angle is generally 90 degrees, that is,
Open at 45 degrees to the central axis. ), The overall shape is flat and substantially circular, and even when the surface is not flat and folds are provided, the maximum thickness is about 10 to 20 mm. The length is about 30 mm (when the diameter of the diaphragm is 30 to 40 cm). This is an epoch-making ultra-thin dynamic speaker unit for hi-fi.

Further, by dividing a substantially circular diaphragm into an inside and an outside with a vibration boundary region as a boundary, an appropriate weight is provided around an outer peripheral edge so that divided vibrations are consciously formed inside and outside the diaphragm. Is occurring.

After all, the resonance frequency of the piston motion on the outer peripheral side is set around several tens Hz, and
The front and rear piston motion having a large amplitude is caused on the outer peripheral edge of the outer peripheral portion in the low frequency range of the z range, thereby improving the characteristics of the low frequency range.

As a result, the diaphragm has a frameless / edgeless structure in which the center voice coil bobbin to which the diaphragm is fixed is supported only by the support member with respect to the driver portion (plate), and the outer peripheral portion of the diaphragm This is a full-range loudspeaker unit which is used as an enclosureless having an open rim because the outer rim is made to perform a piston motion.

[0027]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a view for explaining the structure of a thin planar speaker unit according to the present invention, and FIG. 2 shows the structure of a diaphragm provided with a substantially circular fold according to the present invention (a).
It is a front view and (b) side view. FIG. 3 is a diagram showing an example of a procedure for manufacturing the diaphragm provided with the folds. FIG. 4 is an acoustic characteristic diagram for comparing and explaining the effect of divided vibration in the thin planar speaker unit according to the present invention.
FIG. 4 is an acoustic characteristic diagram of the thin planar speaker unit according to the present invention. In addition, the same part as the above-mentioned conventional dynamic cone speaker 20 (included in the range of the prior art)
Are denoted by the same reference numerals.

In FIGS. 1 and 2, the thin planar speaker unit 60 includes a driver unit 2 which forms a magnetic circuit including a plate 6 and a magnet 3 fixed thereto,
A voice coil bobbin 5 on which the voice coil 1 is wound;
A support member 42 for connecting and supporting the voice coil bobbin 5 to the driver unit 2; a substantially circular diaphragm 51 externally fixed substantially perpendicular to the outer peripheral surface of the voice coil bobbin 5 with the voice coil bobbin 5 as a central axis; A weight (such as lead) 54 attached along the outer peripheral edge of the diaphragm 51
The diaphragm 51 is characterized in that the diaphragm 51 has a ring-shaped flexible vibration boundary region centered on the voice coil bobbin on the central portion 51a and the outer peripheral portion 51b. The diaphragm 51 is divided into two by the vibration boundary region 56.
Is divided into vibrations at the central portion 51a and the outer peripheral portion 51b.

The substantially circular diaphragm 51 is divided into a center portion 51a and an outer peripheral portion 51b by a vibration boundary region 56 which is softer than the other regions.
Since the weight 54 is provided on the outer peripheral edge of the voice coil 1b, the center portion 51a of the diaphragm 51 causes a piston motion due to the vibration of the voice coil bobbin 5 caused by the flow of the audio input signal to the voice coil 1, and Divided vibration occurs in the outer peripheral side portion 51b with the vibration boundary region 56 as a node.

The central portion 51a and the outer peripheral portion 51b
In the low-tone range, the outer peripheral portion 51b with the weight 54 oscillates with a larger amplitude than the central portion 51a (the resonance frequency is as small as several tens Hz). ) The sound pressure characteristics in the low range are expanded. This is because, in the low-frequency range, the amount of amplitude affects low-frequency energy.

The resonance frequency causing the divided vibration depends on the structure of the vibration boundary region 56 (for example, the size of a slit-like small hole,
The size of the diaphragm, the bisecting position, etc.) and the weight of the weight 54.

As described above, since the divided vibration causes the outer peripheral edge (the weight 54) of the outer peripheral portion 51b of the diaphragm 51 to vibrate back and forth with a large amplitude (see FIG. 1), an edgeless structure is indispensable. That is, in the structure of the conventional dynamic speaker unit 20, the outer edges of the frame 10 and the diaphragm 11 are connected by the edge 14 of a soft material formed by thermoforming cloth or urethane foam, and complete free vibration is impossible. However, in the present speaker unit 60, there is no edge, and the outer peripheral edge of the diaphragm 51 is completely open to the outside and vibrates freely.

In this regard, even if the outer peripheral edge of the diaphragm 51 is not an edge but is freely movable in the direction of the piston motion back and forth with respect to the frame by some kind of sliding mechanism, wind noise unavoidable due to vibration is inevitable. Therefore, it is meaningful to use a completely open edgeless frameless structure as in the present invention.

FIG. 4 shows an acoustic comparison between the case where the above-mentioned vibration boundary region 56 is provided and the divided vibration is used (curve A) and the case where the divided vibration is not used without the vibration boundary region 56 (curve B). As is clear from the figure, a remarkable difference appears in the most important bass range of 60 to 300 Hz.

Next, the circular diaphragm 51 will be described in detail. The material of the circular diaphragm 51 is lightweight and has high rigidity (it must be strong enough not to bend against the piston motions before and after) and has an appropriate internal loss. Any shape may be used, for example, the surface of the diaphragm 32 having the honeycomb structure described in the related art may be flat, such as a skin 33 attached thereto. However, the cost increases, and the supporting member 42 is made edgeless and frameless. (The material and shape are not particularly limited. For example, a conventional corrugation damper or butterfly damper may be used.)
I hate to be too heavy to support it alone.

Therefore, in the present invention, as the diaphragm 51, the folds 5 substantially equidistant from the center in the radial direction as shown in FIG.
A structure in which a large number of 7 are provided, practically a structure of a substantially circular diaphragm 51 having 100 to 300 folds is adopted. The material is not particularly limited, and may be paper-based such as conventional kraft paper and Japanese paper, resin-based or inorganic-based such as polypropylene and carbon.

When the diaphragm 51 has the structure having the folds 57, the rigidity is remarkably improved as compared with the case where the diaphragm 51 is flat, and the piston 51 can sufficiently withstand the front and rear piston motion.

As shown in FIG. 3 (a), the circular diaphragm 51 having the fold 57 has a width t of a rectangular diaphragm.
Of many folds 57 are formed and bent (parallel ridges,
The cross section continuous with the valley, the valley, and the valley is folded in a sawtooth shape). Then, as shown in FIG. ,
There is an advantage that it can be easily manufactured at low cost by bonding n and making the center part circular so that the center part becomes an empty circle of the diameter of the outer periphery of the voice coil bobbin 5.

In the prototype of this embodiment, the diaphragm 5
1 has a diameter Φ of about 37 cm, a fold width t of 10 mm, and the number of folds N
The thickness at the center is about 10 mm, which is approximately t. As shown in the side view of FIG. 2B, the thickness is gradually reduced in the radial direction, and the outermost circumference has a shallow fold 57 and almost no irregularities. The state was used (of course, the relationship of N × t ≧ Φ × π is established). However, from the viewpoint of increasing the rigidity of the diaphragm, it is desirable that the dimensions have a margin, and that the outermost peripheral portion has a dimension in which some unevenness of the fold remains.

The center portion 51 of the diaphragm 51
a and the outer peripheral side portion 51b may be separately connected to each other via a member (a soft resin such as liquid rubber) in the vibration boundary region 56, but it is difficult to align the bonding.
According to the manufacturing method, one diaphragm 51 having the above folds as described later
It is preferable in terms of manufacturing method to provide a concentric soft vibration boundary region 56 in the inside.

Next, regarding the vibration boundary region 56,
This means a boundary for dividing the vibration of the diaphragm 51 inside and outside, so that the diaphragm 51 is divided into a central portion 51a and an outer peripheral portion 51b to generate a divided vibration. Is a region having a lower rigidity than that of the material, that is, a region having a high flexibility such as rubber.

In the prototype of the present embodiment, the structure of the vibration boundary region 56 is, as shown in FIG. 2A, a plurality of through holes 59 (slits) formed in the circular vibration plate 51.
A large number of rings are formed around an empty circle that is externally mounted on a voice coil bobbin. By simply providing the through-hole 59 in this manner, the rigidity of the fold 57 is reduced very easily, and the center-side portion 51a and the outer-peripheral-side portion 51b are connected only by a flat bridge between the adjacent through-holes 59. Only the vibration boundary region 56 is a region having high flexibility.

However, if a large number of the through holes 59 are provided, the durability of the vibration boundary region 56 is reduced to some extent. Therefore,
In the vibration plate 51 according to the present invention, a flexible reinforcing member is attached to the vibration boundary region 56. This reinforcing member is, for example, a soft synthetic resin material such as liquid rubber. In the present prototype, the liquid rubber is applied over the entire ring-shaped vibration boundary region 56 so as to cover the through hole 59 and reinforced. It is needless to say that this reinforcing member is not limited to the structure of the vibration boundary region 56 provided with the through-hole 59 as described above, and is effective for improving the durability even in the case of another structure.

Next, as can be seen from FIG. 1, the voice coil bobbin 5 to which the diaphragm 51 according to the present invention is attached is supported by the support member 42 only to the plate 6 of the driver section 2 so as to be edgeless and frameless. Due to the structure, even though the diaphragm 51 is light, the load on the support member 42 is larger than that of the conventional dynamic cone speaker 20, and the support member 42 is also used to stabilize the amplitude during bass reproduction due to its characteristics. Support needs to be strengthened. In view of this, in the present invention, as shown in FIG. 1, the support member structure has a structure in which a plurality of support members are stacked (in FIG. 1, a double structure) to increase the support force. The laminated support member structure in which a plurality of stacked members are not present in the conventional dynamic cone speaker 20 having an edge, is a thin flat speaker 6 according to the present invention.
0 is a specific structure.

The adoption of the laminated support member structure allows the conventional damper 12 (corrugation damper, butterfly damper, etc.) to be used as the support member 42 as it is, so that the effect of improving the reliability of the speaker unit 60 of the present invention at low cost is obtained. Demonstrate.

FIG. 5 is an acoustic characteristic diagram of the final specification designed optimally for the above-mentioned prototype, and it can be seen that it has a flat excellent acoustic characteristic from a low frequency range of several tens Hz to a high frequency range of 20,000 Hz (2 kHz). There is a sharp valley in the vicinity, but the width is extremely narrow, so there is little problem.)
This is a full range speaker with extremely high fidelity because it is given an ideal piston motion vibration in the structure and has no influence of the enclosure and emits audio signals directly as sound waves, so it can be applied sufficiently for Hi-Fi. It can be called performance.

Finally, the enclosure will be described. A normal speaker system is fixed inside an enclosure (box) accommodating a speaker unit. The thin flat speaker 60 according to the present invention is, as described in detail, In principle, it is composed of only a speaker unit as an enclosureless.

Of course, in order to arrange the substantially circular diaphragm 51 in a state where the outer peripheral edge of the diaphragm 51 is opened to be hollow and set substantially vertically, the magnet of the driver section 2 at the center of the rear surface of the diaphragm 51 is provided. It is necessary to provide a support for the support or the wall surface on the plate 6 which is provided, but these are accessories attached to the speaker unit and are not enclosures.

In order to protect the exposed diaphragm 51, a net or frame covering the front surface or the periphery thereof (for example, recall the shape of a net frame surrounding the blades of an electric fan and its protective action) is provided. However, this is merely an accessory, not an enclosure that affects acoustic properties.

As a reminder, by adjusting the dividing ratio (dimension ratio in the radial direction) and the weight 54 of the circular diaphragm 51, various types of circular materials of various sizes can be adjusted. This makes it possible to optimally adjust the acoustic characteristics of the diaphragm in the low-tone range.

The thin flat speaker 60 according to the present invention has a diaphragm 51 having a diameter of about 37 cm if an internal magnet type is employed as the magnetic circuit of the driver unit 2 in addition to the high performance corresponding to the full range as described above. The overall thickness of the speaker unit can be made ultra-thin, about 30 mm, and it can be applied to various applications in combination with its simple structure, low cost, light weight, and novel appearance. It is a new dynamic speaker with a secret.

[0053]

As described above, the thin flat speaker according to the present invention has the following excellent effects.

(1) By dividing and vibrating the substantially circular diaphragm, the problem of the reversed phase due to the enclosureless is solved, and the acoustic characteristics in the low-tone range are excellent.

(2) Since the speaker unit is thin and light without being edgeless or frameless, it can be mounted on a wall.

(3) It can be manufactured at low cost.

(4) It is possible to provide a large dynamic speaker capable of supporting a full range.

(5) Durability and high sound fidelity.

[Brief description of the drawings]

FIG. 1 is a view for explaining the structure of a thin planar speaker unit according to the present invention.

2A is a front view and FIG. 2B is a side view showing a structure of a diaphragm provided with a substantially circular fold according to the present invention.

FIG. 3 is a diagram showing an example of a manufacturing procedure of a diaphragm provided with a fold according to the present invention.

FIG. 4 is an acoustic characteristic diagram for comparing and explaining the effect of divided vibration in the thin planar speaker unit according to the present invention.

FIG. 5 is an acoustic characteristic diagram of the thin planar speaker unit according to the present invention.

FIG. 6 is a sectional view showing the structure of a conventional general dynamic cone speaker unit.

FIG. 7 is a comparison diagram of acoustic characteristics between a dynamic thin flat speaker and a conventional general bass reflex 3-way speaker.

FIG. 8 is a perspective view illustrating the structure of three types of conventional dynamic planar speakers.

[Explanation of symbols]

 Reference Signs List 1 voice coil 2 driver part 3 magnet 4 pole piece 5 voice coil bobbin 6, 7 plate 8 center cap 10 frame 11 cone diaphragm 12 damper 14 edge 15 gasket 16 terminal 17 tinsel wire 20 dynamic cone speaker unit 30 filling dynamic speaker 31 voice Coil 32 Planar diaphragm 33 Surface skin material 36 Subcone 37 Urethane foam material 38 Metal cone 40, 50 Plate-type dynamic speaker 42 Support member 51 Vibration plate 51a Center part of diaphragm 51b Outer part of diaphragm 54 Weight 56 Vibration boundary Area 57 Fold 59 Through hole 60 Thin flat speaker

Claims (5)

[Claims] 1. A voice coil bobbin on which a voice coil is wound and driven by a driver constituting a magnetic circuit, a support member for connecting and supporting the voice coil bobbin to the driver, and a center axis of the voice coil bobbin. A frameless edgeless structure comprising a substantially circular diaphragm fixed externally to the outer peripheral surface of the voice coil bobbin and a weight attached along an outer peripheral edge of the diaphragm; The diaphragm is bisected by a ring-shaped flexible vibration boundary region centering on the voice coil bobbin into a center portion and an outer peripheral portion, and the diaphragm is located on the center side with the vibration boundary region as a node. A thin flat speaker unit characterized by vibrating separately at a portion and an outer peripheral portion. 2. The thin flat speaker unit according to claim 1, wherein a plurality of folds extending radially from the center in the circumferential direction are continuously provided on the diaphragm. 3. The thin flat surface according to claim 1, wherein the vibration boundary region has a structure in which a plurality of through holes are formed in the diaphragm in a ring shape around the voice coil bobbin. Speaker unit. 4. The flexible boundary member according to claim 1, wherein a flexible reinforcing member is attached to the vibration boundary region.
Or the thin flat speaker unit according to claim 3. 5. The apparatus according to claim 1, wherein a plurality of support members for connecting and supporting the voice coil bobbin to which the diaphragm is attached with respect to the driver section are attached.
A thin planar speaker unit according to claim 2, 3, or 4.