JPH08251691A - Speaker unit - Google Patents

Abstract

PURPOSE: To provide a speaker system capable of securing rigidity, high in degree of freedom in design, and excellent in sound pressure characteristics and frequency characteristics even its appearance is considered first in design. CONSTITUTION: In a speaker unit 1 fixing an edge 4 on the inside and rear face side of the outer peripheral edge of a diaphragm 5, the adhering margin 4a of the edge 4 to be stuck to the diaphragm 5 is formed in the outer peripheral edge direction of the diaphragm 5. Consequently the rigidity of the outer peripheral part of the diaphragm 5 can be improved without changing the appearance of the unit 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker unit used in various audio equipment.

[0002]

2. Description of the Related Art Conventionally, there is a speaker unit 21 having a so-called discrete edge type structure in which an edge is fixed to the inside of an outer peripheral portion of a diaphragm and the edge is covered with the diaphragm. The configuration and operation of the speaker unit 21 will be described below with reference to FIGS. 3 and 14 to 16.

As shown in FIG. 14, the speaker unit 21 includes a lower plate 3 having a center pole 30a.
A frame 23 is coupled to the upper surface of the magnetic circuit 22 that holds a ring-shaped magnet 32 between 0 and the ring-shaped upper plate 31. A damper 29 is fixed to the frame 23 so as to hold the middle portion of the voice coil 27 so that the lower portion of the voice coil 27 fits into the magnetic gap 28 of the magnetic circuit 22 without being eccentric.

The outer peripheral portion of the diaphragm 25 is the edge 24.
While being fixed to the frame 23 together with the gasket 26 via the, the inner peripheral portion of the diaphragm 25 is connected to the upper portion of the voice coil 27. The vibrating plate 25 has a shape in which the outer peripheral portion is enlarged so as to cover the radiation surface of the edge 24. Further, a cap 33 is fixedly attached to the center front surface of the diaphragm 25. In addition, as shown in FIG.
4 is attached to the vibrating plate 25 by a bonding margin 24a extending in the center direction of the vibrating plate 25.

The shape of the diaphragm 25 is substantially the same as that of the diaphragm 5 of FIG. 3 used in the embodiment 1 described later.

The operation of the speaker unit 21 having the above structure will be briefly described. First, when an input signal (current) to be reproduced is applied to the voice coil 27, the voice coil 27 receives a magnetic field from the magnetic circuit 22, and the voice coil 27 receives a force according to Fleming's left-hand rule and is displaced in the axial direction. The amount of displacement changes depending on the magnitude of the current value and the fluctuation of the frequency. As a result, the voice coil 27 and the voice coil 2
The vibrating plate 25 connected to 7 vibrates at a frequency corresponding to the input signal, and the vibrating plate 25 emits sound into the air.

In the above speaker unit 21, since the edge 24 is covered with the diaphragm 25, the sound emitted from the edge 24 can be blocked and only the sound emitted from the diaphragm 25 can be reproduced. Further, as a result of incorporating the edge 24, the height of the speaker unit 1 can be reduced, and the diaphragm 2 can be used when the same size frame is used.
Since the size of 5 can be made as large as possible, it is suitable for use in places where space is limited, such as car audio devices. Further, in the case of a speaker system, the diaphragm 25 and the cap 3 are installed from the outside.
Since only 3 can be seen, it has a very clean appearance and matches any design without disturbing the harmony.

However, in the discrete edge type speaker unit, since the inner diameter of the edge 24 is small, the strength in the circumferential direction is reduced, low frequency distortion is caused by bending resonance, and free end is generated at the time of split resonance. The frequency characteristics may be disturbed by the high frequency distortion generated from the outer peripheral edge of the vibrating plate 25, and in a severe case, a problem such as generation of an abnormal sound called surface squeal may occur. For example, an example of the sound pressure characteristic of the speaker shown in FIG. 15 is shown in FIG. 16, and in this speaker, the sound pressure level drops near 2 kHz.

Particularly, when the diaphragm is lightened for the purpose of improving the sound pressure level or increasing the resonance frequency, the effect is remarkable.

Therefore, in Japanese Patent Laid-Open No. 6-125594, FIG.
As shown in Fig. 18, a corrugation 34a having a corrugated cross-section is radially molded on the outer peripheral portion of the diaphragm 34, while in Japanese Patent Laid-Open No. 5-168091, as shown in FIG. A configuration is disclosed in which a rising portion 35a and a flat flange 35b are provided, or a rising portion 36a and a roll-shaped flange 36b are provided on the vibration plate 36 as shown in FIG. The above publication discloses a configuration in which the rigidity of the outer peripheral portion of the diaphragm is improved in the axial direction and the circumferential direction to increase the resonance frequency, thereby suppressing the disturbance of the frequency characteristics due to the split resonance and the bending resonance.

[0011]

However, in the above configuration, since the shape of the reinforced portion appears on the surface of the diaphragm, the speaker system also has an appearance that matches the shape of the diaphragm, assuming the shape of the diaphragm. Will need to be designed. That is, there is a problem that the shape of the diaphragm becomes a constraint, and the degree of freedom in designing the appearance is significantly limited.

Therefore, when the design of the speaker system is given priority to the appearance, the rigidity of the diaphragm cannot be ensured, and unnecessary resonance is generated in the outer peripheral portion of the diaphragm to disturb the sound pressure characteristic. The surface pressure will be generated, or the sound pressure level will be lowered in order to avoid the above.

On the other hand, when the speaker unit disclosed in (1) is used to design the sound pressure characteristic and the frequency characteristic in priority, a speaker system suitable for the appearance of the speaker unit resulting from securing the rigidity of the diaphragm. In addition to price and performance, there are strong demands on the design side, and in the current situation where sales are affected by the design, the appearance of the speaker unit makes the design as a speaker system. Being limited is not desirable. In addition, in the configuration of (1), since the strength is increased by the rising portions 35a and 36a, there is a problem that the height of the speaker unit must be increased.

An object of the present invention is to provide a speaker unit used for various audio equipment, which realizes good frequency characteristics and sound pressure characteristics without affecting the appearance.

[0015]

In order to solve the above-mentioned problems, a speaker unit according to a first aspect of the present invention has an edge connected to the inside of the outer peripheral edge of the back surface of the diaphragm and an edge connected by the outer peripheral edge. In the speaker unit in which the cover is covered, a bonding margin between the diaphragm and the edge is formed on the outer peripheral side.

In the speaker unit according to the second aspect of the present invention, the edge is connected to the inside of the outer peripheral edge of the back surface of the diaphragm, and the edge is covered by the outer peripheral edge. It is characterized in that a rib formed integrally with the diaphragm is provided so as to project on the back surface on the outer peripheral side.

[0017]

According to the structure of the first aspect, since the bonding margin between the edge and the vibrating plate is provided on the outer peripheral side of the vibrating plate, no special processing for reinforcing the vibrating plate is required. However, the adhesive margin acts as a reinforcing member on the outer peripheral portion of the diaphragm. Therefore, even if the diaphragm is lightened to improve input resistance and sound pressure level, the rigidity of the diaphragm is ensured by the reinforcement of the outer peripheral part, so that the disturbance of the sound pressure characteristic, the frequency characteristic and the surface squealing etc. Can be suppressed. Moreover, since the appearance of the front side of the diaphragm is not affected, the appearance of the speaker unit is unlikely to affect the design as a speaker system, and there are few restrictions on the degree of freedom in terms of design, compactness, and sound pressure characteristics. A speaker unit having excellent frequency characteristics can be provided.

According to the second aspect of the present invention, since the rib protruding integrally with the diaphragm is provided on the rear surface of the diaphragm, the shape of the surface of the diaphragm is not affected and the diaphragm is not affected. It is possible to reinforce the outer peripheral portion of. Therefore, similarly to the first aspect, even if the design is prioritized in appearance or the diaphragm is lightened to improve the sound pressure level, the rigidity of the diaphragm can be secured by the reinforcement of the outer peripheral portion of the diaphragm. Since it is possible to suppress the disturbance of sound pressure characteristics and frequency characteristics and the ringing noise, there are few restrictions on the degree of freedom in terms of design, and it is compact and has excellent sound pressure characteristics and frequency characteristics. Can be

In particular, when radial ribs are provided on the outer peripheral portion of the diaphragm, axial division resonance is suppressed, and when circular ribs are provided on the outer peripheral portion of the diaphragm, the circular ribs are Suppresses bending resonance in the direction. As a result, reverse resonance of the outer peripheral portion of the diaphragm can be suppressed. Of course, when the radial ribs and the circumferential ribs are provided at the same time, both split resonance and bending resonance are suppressed, and the above-described effect of suppressing reverse resonance can be expected to be further improved.

[0020]

【Example】

[Embodiment 1] Another embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2, the speaker unit 1 according to the present embodiment has a magnetic circuit 2 in which a ring-shaped magnet 12 is held between a lower plate 10 having a center pole 10a and a ring-shaped upper plate 11. The frame 3 is coupled to the upper surface.

A damper 9 is fixed to the frame 3 while holding the middle portion of the voice coil 7 so that the lower portion of the voice coil 7 fits into the magnetic gap 8 of the magnetic circuit 2 without being eccentric. .

The outer peripheral portion of the diaphragm 5 is fixed to the frame 3 together with the gasket 6 via the edge 4, while the inner peripheral portion of the diaphragm 5 is connected to the upper portion of the voice coil 7. This diaphragm 5 is a so-called discrete edge type speaker unit whose outer peripheral portion is enlarged so as to cover the radiation surface of the edge 4. Further, the front surface of the center of the diaphragm 5 has a cap 1 for preventing adsorption of dust and the like.
3 is fixed.

As shown in FIG. 3, the diaphragm 5 has almost no difference in shape from the diaphragm used in the conventional discrete edge type speaker unit.

An end view of the outer peripheral portion of the speaker unit 1 is shown in FIG. 1. The edge 4 is attached to the inside of the outer peripheral edge portion of the diaphragm 5, and the bonding margin 4a between the edge 4 and the diaphragm 5 is It can be seen that the edge 4 covers from the mounting portion to the outer peripheral edge portion. That is, since the adhesive margin 4a acts as a member that reinforces the outer peripheral portion of the diaphragm, the frequency characteristics are less likely to be disturbed due to the weight reduction of the diaphragm for improving the sound pressure characteristics, and the diaphragm itself. Since there is no need to perform processing for reinforcement, there is no change in appearance and there are few design restrictions.

As a result, it is possible to provide a speaker unit which is excellent in sound pressure characteristics and frequency characteristics and which has a high degree of freedom in designing its external appearance.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIGS. 4 to 6. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

The speaker unit 14 of this embodiment is shown in FIG.
As shown in, the speaker unit is the same as the speaker unit of the first embodiment except that the shape of the edge 4 and the shape of the diaphragm 15 are different.

An end view of the outer peripheral portion of the speaker unit 14 is shown in FIG. In this embodiment, the margin 4 of the edge 4
As in the conventional case, a is provided on the inner peripheral side, and radial ribs 15a are provided so as to project from the mounting portion of the edge 4 toward the outer peripheral portion toward the outer peripheral edge toward the back surface side of the diaphragm 15. . As shown in FIG. 6, this is provided at a total of five positions at positions that divide the circumferential direction into five equal parts. The number and size of the radial ribs 15a are determined by the output of the speaker unit,
It may be appropriately set depending on the size and the like. Thereby, the rigidity of the diaphragm 15 in the axial direction can be improved, and the resonance frequency at the time of split resonance can be increased.

As a result, it is possible to provide a speaker unit which is excellent in sound pressure characteristics and frequency characteristics and which has a high degree of freedom in designing its external appearance.

[Embodiment 3] Another embodiment of the present invention will be described below with reference to FIGS. 7 to 9. For convenience of explanation, members having the same functions as those shown in the drawings of the first and second embodiments will be designated by the same reference numerals, and the description thereof will be omitted.

The speaker unit 16 of this embodiment is shown in FIG.
As shown in FIG. 5, the configuration is the same as that of the speaker unit of the second embodiment except that the ribs provided on the diaphragm 17 are different in shape.

An end view of the outer peripheral portion of the speaker unit 16 is shown in FIG. 8. Two outer peripheral portions having different diameters projecting toward the outer peripheral direction from the mounting portion of the edge 4 and having different diameters. Ribs 17a and 17b are provided.
The circumferential ribs 17a and 17b are, as shown in FIG.
The diaphragm 17 is formed so as to be concentric with the diaphragm 17, but the number and size thereof may be appropriately set depending on the output and size of the speaker unit. Thereby, the diaphragm 17
Since the rigidity in the circumferential direction can be improved, the resonance frequency at the time of bending resonance can be increased.

As a result, the sound pressure characteristic and the frequency characteristic are excellent,
In addition, it is possible to provide a speaker unit having a high degree of freedom in external design.

[Embodiment 4] Another embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, members having the same functions as those shown in the drawings of the first and second embodiments will be designated by the same reference numerals, and the description thereof will be omitted.

The speaker unit 18 of this embodiment is shown in FIG.
As shown in 0, the speaker unit is the same as the speaker unit of the second embodiment except that the shape of the diaphragm 19 is different.

An enlarged view of the outer peripheral portion of the speaker unit 18 is shown in FIG. 11. The circumferential rib 19a projects to the rear surface of the diaphragm toward the outer peripheral side from the mounting portion of the edge 4.
19b and radial ribs 19c are provided. As shown in FIG. 12, the circumferential ribs 19a and 19b are formed so as to form a concentric circle with the diaphragm 19, and the radial ribs 19c are provided at a total of five positions at which the concentric circle is divided into five equal parts. However, the number and size of the above ribs may be appropriately set according to the output and size of the speaker unit.
As a result, the rigidity of the vibration plate 19 in the axial direction and the circumferential direction can be improved, so that the resonance frequency at the time of split vibration or bending vibration can be increased.

As a result, the sound pressure characteristic and the frequency characteristic are excellent,
And it can be a speaker unit with a good design.

The sound pressure characteristic of the conventional product shown in FIG. 16 and the sound pressure characteristic shown in FIG. 13 measured using the speaker unit manufactured by applying the configuration shown in the above-mentioned Example 1 to the conventional product. Comparing with, it can be seen that the speaker according to the present embodiment has an improved sound pressure level near 2 KHz as compared with the conventional product.

As for the results of the other examples, since almost the same improvement data of the sound pressure characteristics as the above is obtained with respect to the sound pressure characteristics of the conventional product, only the measurement results of the first example are represented. And showed it.

In the above-mentioned embodiment, when the rigidity in the axial direction is improved, the resonance frequency at the time of division vibration becomes high, so that the division resonance and abnormal noise such as surface squeal caused by it are less likely to occur. , It is possible to improve the high frequency characteristics of input resistance and reproduction frequency, and if the rigidity in the circumferential direction is improved, the resonance frequency during flexural vibration becomes higher, so suppress low frequency distortion. In both cases, the sound pressure characteristic and the frequency characteristic can be improved without changing the appearance of the conventional speaker unit.

[0042]

As described above, the speaker unit according to claim 1 of the present invention has the edge connected to the inside of the outer peripheral edge of the rear surface of the diaphragm and the edge covered by the outer peripheral edge. In the above, the margin for adhesion between the diaphragm and the edge is formed on the outer peripheral side.

Therefore, this does not require a special configuration on the diaphragm side, improves the rigidity of the outer peripheral portion, raises the resonance frequency, suppresses split resonance and bending resonance, and in appearance. Therefore, even if the appearance of the speaker system is prioritized, the sound pressure characteristic and the frequency characteristic can be improved.

In the speaker unit according to claim 2 of the present invention, the edge is connected to the inside of the outer peripheral edge of the rear surface of the diaphragm, and the edge is connected in the speaker unit whose edge is covered by the outer peripheral edge. A rib integrally formed with the diaphragm is provided so as to project from the rear surface on the outer peripheral side of the position where the rib is formed.

Therefore, as a result, the same as in claim 1 is obtained.
It is possible to improve the rigidity of the outer peripheral portion without changing the appearance.

[Brief description of drawings]

FIG. 1 is an enlarged end view of a diaphragm outer peripheral portion in a speaker unit according to an embodiment of the present invention.

FIG. 2 is a sectional view of a speaker unit according to an embodiment of the present invention.

FIG. 3 is a diagram of a diaphragm used in the speaker unit in FIG. 2 viewed from the back side.

FIG. 4 is a sectional view of a speaker unit according to another embodiment of the present invention.

5 is an enlarged end view of the outer peripheral portion of the diaphragm of the speaker unit shown in FIG.

6 is a diagram of a diaphragm used in the speaker unit in FIG. 4 viewed from the back side.

FIG. 7 is a sectional view of a speaker unit according to another embodiment of the present invention.

8 is an enlarged end view of the outer peripheral portion of the diaphragm of the speaker unit in FIG.

9 is a diagram of a diaphragm used in the speaker unit in FIG. 7 viewed from the back side.

FIG. 10 is a cross-sectional view of a speaker unit according to another embodiment of the present invention.

11 is an enlarged end view of a diaphragm outer peripheral portion of the speaker unit in FIG.

FIG. 12 is a diagram of a diaphragm used in the speaker unit in FIG. 10 viewed from the back side.

FIG. 13 is a diagram showing frequency characteristics in the first embodiment.

FIG. 14 is a cross-sectional view of a conventional speaker unit.

15 is an enlarged end view of the outer peripheral portion of the diaphragm of the speaker unit in FIG.

16 is a diagram showing frequency characteristics of the speaker unit in FIG.

FIG. 17 is a partial cross-sectional view showing a diaphragm in another conventional speaker unit.

FIG. 18 is an enlarged end view showing an outer peripheral portion of a diaphragm in still another conventional speaker unit.

FIG. 19 is an enlarged end view showing an outer peripheral portion of a diaphragm in still another conventional speaker unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speaker unit 2 Magnetic circuit 3 Frame 4 Edge 4a Adhesive margin 5 Vibration plate 15 Vibration plate 15a Radial rib 17 Vibration plate 17a Circular rib 17b Circular rib 19 Vibration plate 19a Circular rib 19b Circular rib 19c Radial rib

Claims (2)

[Claims] 1. A speaker unit in which an edge is connected to an inner side of an outer peripheral edge portion of a rear surface of a diaphragm and the edge is covered by the outer peripheral edge portion, and a bonding margin between the diaphragm and the edge is formed on an outer peripheral portion side. The speaker unit characterized by having. 2. A speaker unit in which an edge is connected to an inner side of an outer peripheral edge portion of a rear surface of a diaphragm and the edge is covered by the outer peripheral edge portion, and the diaphragm is provided on a rear surface on an outer peripheral side of a position where the edge is connected. The speaker unit is characterized in that a rib molded integrally with the protrusion is provided.