JPH08102988A - Speaker - Google Patents

Abstract

PURPOSE: To enhance an electroacoustic transducing efficiency and to obtain a broad directivity characteristic in which balance of vibration is easily taken with respect to a large electric input and no lateral vibration of a vibration system is caused. CONSTITUTION: A centralized drive section is fitted and fixed to a section 4 nearly in the middle of a adhesion section in which longitudinal split cylindrical diaphragms 1, 2 are adhered in parallel. Then end ridges 1e, 2e of the diaphragms 1, 2 are extended up to a position with nearly the same height as an upper face of a top plate 7 of a magnetic circuit 6 and lower than the centralized drive section and fixed to a frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pitched or mid-pitched loudspeaker equipped with a vertically divided cylindrical diaphragm.

[0002]

2. Description of the Related Art Conventionally, as a speaker of this type, there is a speaker configured to drive a central portion of a wing-shaped diaphragm, as shown in FIG. 1 of Japanese Patent Publication No. 32-7807.

[0003]

Therefore, the conventional speaker having this kind of wing-shaped diaphragm is a comparatively rectangular diaphragm, and the fixing point at the outer edge of the diaphragm is located at a position higher than the driving point. Since it is arranged in the above position, it is difficult to balance the vibration in the length direction, and there is a problem that unbalanced vibration is easily generated in the lateral direction. Further, in a speaker having such a wing-shaped diaphragm, unless the magnetic gap of the magnetic circuit is made relatively large, there is a problem that the voice coil shakes laterally and rubs against the gear to generate a distorted sound. there were.

Therefore, in order to solve the problem of the speaker having such a conventional wing-shaped diaphragm, the present invention drives the middle of the joint portion in which the vertically divided cylindrical diaphragms are formed in parallel. For the purpose of improving the balance of vibration by fixing the points by extending the edges to the position of the same height as the height of the top plate of the magnetic circuit and improving the balance of vibration, A speaker that can prevent lateral shake and has a high electroacoustic conversion efficiency, and the diaphragm and the drive unit are separately manufactured at the manufacturing stage, and is convenient to be integrally coupled during assembly. It is the one we are trying to provide.

[0005]

The structure of the present invention for achieving the object will be described with reference to FIGS. 1 and 2 corresponding to the embodiments. The plates 1 and 2 are formed by arranging them in parallel and integrally with each other.
On the joint 12 line connecting the two adjacent straight sides 1a, 2a, the facing portion 4a of the tip of the drive voice coil bobbin 4,
4a is attached and fixed, and the edges 1e of the vibration plates 1 and 2,
2e is extended to the frame 8 attached to the top plate 7 of the magnetic circuit 6 in which the annular magnetic gap 6b is formed, and is extended to the same position as the joint 12 or a position lower than the same, and fixed to the frame 8. It is a speaker.

A second aspect of the present invention is the speaker of the first aspect of the present invention, in which the opposing portion 4a at the tip of the driving voice coil bobbin 4 is located on the joint 12 line connecting the adjacent straight sides 1a, 2a of the diaphragms 1, 2. , 4a are attached and fixed so as to be offset from the center of the joint portion 12.

A third aspect of the invention is the speaker of the first or second aspect of the invention, in which the adjacent straight sides 1a, 2 of the diaphragms 1, 2 are adjacent.
On the joint 12 line connecting a, the opposing portions 4 of the tips of the plurality of driving voice coil bobbins 4 and 4 ′ having the same diameter.
It is a speaker in which a and 4a ′ are attached and fixed in series in a symmetrical manner on the line of the joint 12 in a centrosymmetric manner.

A fourth aspect of the invention is the speaker of the first or second aspect of the invention, in which the adjacent straight sides 1a, 2 of the diaphragms 1, 2 are adjacent to each other.
On the joint 12 line connecting a, the facing portion 4 at the tip of the plurality of driving voice coil bobbins 4, 4 ″ having different diameters.
It is a speaker in which a and 4a '' are fixed in series.

A fifth aspect of the present invention is the loudspeaker according to any one of the first to fourth aspects of the invention, in which vertically divided cylindrical diaphragms 1 and 2 are formed integrally by being arranged in parallel in a closed circumferential manner. , The adjacent straight side portions 1a and 2a are connected to each other to form the joint portion 1
A driving unit 2 including a vibrating unit 9 forming a frame 2 and a frame 8 and a magnetic circuit 6 having a driving voice coil 14.
6 is a separate speaker, and both are integrally joined.

A sixth aspect of the present invention is the speaker according to any one of the first to fifth aspects of the invention, in which the diaphragms 101, 102, 103, 104 having a vertically split cylindrical shape are closed and are integrally arranged in parallel in a circumferential direction. Formed by arranging, and the adjacent straight side portion 1
Diaphragm 1 which joins 01a, 102a, 103a, 104a to form joints 112, 123, 134, 114
This is a speaker in which 01, 102, 103, and 104 are formed of an integral material.

A seventh aspect of the present invention is the speaker according to any one of the first to sixth aspects of the invention, wherein the diaphragms 201, 202, 203, 204 having a vertically split cylindrical shape are closed and are integrated in parallel in a circumferential direction. Formed by arranging, and the adjacent straight side portion 2
The diaphragm 2 which connects 01a, 202a, 203a, 204a, and forms the joint part 212,223,234,214.
This is a speaker in which 01, 202, 203, and 204 are integrally formed of a synthetic resin material such as polyamide or polyimide.

An eighth aspect of the present invention is the speaker according to any one of the first to sixth aspects of the invention, in which the diaphragms 201, 202, 203, 204 having a vertically split cylindrical shape are closed and integrated in parallel in a circumferential direction. The joint portions 212, 223, 234, 214 formed by arranging and forming and connecting the adjacent straight side portions 201a, 202a, 203a, 204a,
The magnetic poles are joined back to back to form the magnetic gaps 6b, 6c,
6d and 6e are radially arranged and formed on the drive unit 26. Opposing portions 44a, 44a; 45a, 45a; 46a, 46a; 4 at the tips of the voice coil bobbins 44, 45, 46, 47 are provided.
The speaker 7a, 47a 44a, 45a, 46a, 47a is fixedly attached.

[0013]

Therefore, the loudspeaker of the present invention has such a structure that the driving point of such a diaphragm is mounted at a position higher than the fixed point of the edge of the diaphragm, so that it is suitable for a large electric input. However, the balance of vibration is improved, lateral vibration of the vibration system including the diaphragm can be prevented, electro-acoustic conversion efficiency can be improved, and broad directional characteristics can be achieved. can get.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 16 are views showing a speaker related to the present invention. FIG. 1 is a cross-sectional view of an embodiment of a speaker of the first invention of the present invention, and FIG. 2 is a center drive type of FIG. II-II longitudinal sectional view of an example, FIG. 3 is a front view of an embodiment in which the drive unit of the first invention is eccentrically attached, FIG. 4 is a vertical sectional view taken along the line IV-IV of FIG. 3, and FIG. 5 is the second invention of the present invention. A cross-sectional view showing an embodiment of
6 is a vertical cross-sectional view of the embodiment of FIG. 5 equipped with a drive unit having the same diameter, FIG. 7 is a vertical cross-sectional view of an embodiment equipped with a plurality of drive units of different diameters, and FIG. -VIII vertical cross-sectional view, FIG. 9 is a horizontal cross-sectional view showing an exploded structure of an embodiment of the present invention speaker, FIG. 10 is a vertical cross-sectional view taken along the line XX of FIG. 9, and FIG. FIG. 12 is a cross-sectional view of the speaker, FIG. 12 is a XII-XII vertical cross-sectional view of the two back-to-back speakers shown in FIG. 11, FIG. 13 is a cross-sectional view of the breathing cylinder type speaker of the present invention having a radial magnetic gap, and FIG. 15 is a perspective view of the diaphragm of FIG. 15, FIG. 15 is a view showing the directional characteristics and distortion characteristics of the speaker of the present invention, FIG.
FIG. 6 is a diagram showing the directional characteristics and distortion characteristics of a conventional dome-shaped tweeter.

1 and 2, the first and second invention speakers are vertically divided cylindrical diaphragms, and two of them are arranged in parallel in the same direction by bending one material. Then, the adjacent straight sides 1 of the vibrating plates 1 and 2 are arranged.
a, 2a connecting part 12 on-line intermediate part 12 intermediate part 1
The tip end facing portion 4 of the movable coil bobbin 4 mounted on the magnetic circuit 6 having the annular magnetic gap 6b formed at 2m and 12m.
a, 4a, that is, a concentrated drive unit is fixedly attached, and the edges 1e and 2e of the diaphragms 1 and 2 have the same height as the frame 8 attached to the upper surface of the top plate 7 of the magnetic circuit 6a. The basic structure of the center drive type speaker of the present invention fixed to the frame 8 by extending to a position lower than the drive section 4a. In addition, 22 is a magnet, 2
3 is a damper.

When the diaphragms 1 and 2 are made of synthetic resin and integrally molded as described above, when they are bent from the center line, they become a mechanically strong joint 12 and have a stable strength against vibration. Hold. Then, such a dual-type diaphragm speaker is combined with the magnetic circuit 6 as a single unit,
It is easy to use as a high-pitched speaker, and when it is placed vertically on the front of the low-pitched speaker to make a 2-way or 3-way coaxial speaker, space can be effectively used and the directional characteristics of the high tone range are horizontal. It becomes broad in the direction and becomes advantageous.

FIGS. 3 and 4 show that the mounting position of the driving unit of the speaker of the first invention, whose cross section is shown in FIG.
Of the drive voice coil bobbin 4 at the tip end of the drive voice coil bobbin 4 is attached at an eccentric position with the center 12m of the joint 12 removed, on the joint 12 line connecting the adjacent straight sides 1a, 2a of FIG. And the diaphragms 1 and 2
Since it is difficult for a standing wave to ride, the vibration can be reproduced from the high-pitched part to the mid-tone part without any peaks or dips and without distortion.

The second invention speaker shown in FIGS. 5, 6, 7 and 8 is the same as the first invention speaker except that the adjacent straight sides 1a and 2a of the vertically divided cylindrical diaphragms 1 and 2 are connected to each other. A plurality of driving voice coil bobbins 4, 4 ′ having the same diameter on the joined line 12 facing each other 4 a, 4
a; a multi-driving point type speaker in which a driving unit having a; 4a ', 4a' is attached and fixed center-symmetrically on the joint 12 line, of which the speaker shown in FIGS. Adjacent straight sides 1a, 2a that extend long
On the joint 12 line connecting the two, the facing portions 4 of the tips of the driving voice coil bobbins 4 and 4'having a plurality of different diameters.
This is a speaker in which a driving unit having a and 4a ′ is attached and fixed in series on the joint 12 line. The loudspeakers shown in FIGS. 5, 6, 7, and 8 are suitable for high-power powerful speakers because the driving force per unit area of the diaphragm is strong.

The speaker of the third invention is the same as the speaker shown in FIGS. 9 and 10, except that the diaphragm 1 having a vertically split cylindrical shape is used.
2 is formed by integrally arranging 2 in a closed circumferential arrangement in parallel and connecting the adjacent straight sides 1a and 2a to form a joint 12, and the frame 8 is assembled. The combined vibrating portion 9 and the driving portion 15 including the magnetic circuit 6 having the driving voice coil bobbin 4 are separately manufactured and placed in different steps, and both can be integrally joined in another step. It is a speaker with a convenient structure. With such a configuration, in the third invention speaker, a large number of magnetic circuits 15, ... Having voice coils 14, ..
It is convenient that an assembly method with a high degree of freedom can be selected, in which 5 ... Can be appropriately selected and attached according to the use of the speaker.

The loudspeaker of the fourth aspect of the invention is the loudspeaker shown in FIGS.
1, 102; 103, 104 are formed by integrally arranging two closed sets in parallel in a circumferential manner, and connecting the adjacent straight sides 101a, 102a; 103a, 104a to each other to join the joints 112, 123; The joining portions 112, 13 are formed in the voice coil bobbins 24, 25 of the magnetic circuit 36, which are assembled by forming the magnetic gaps 16b, 16c so as to form backs and backs to each other, and the tip facing portions 40a; 40a '.
4 are joined and fixed to each other, and the vibrating plates 101, 1 of the vertically split cylindrical shape
02, 103; 104 edges 1e, 2e; 3e, 4e
Is fixed to the outer circumference of the magnetic circuit 36.

In the speaker having such a structure, the diaphragms 101, 102; 103, 104 are integrally formed in parallel and formed, and the adjacent straight sides 101a, 102 thereof are formed.
a; 103a, 104a are connected to each other to form the joints 112, 12
It is advantageous in terms of quality and manufacturing cost to integrally mold 3; 134 and 114 together with a synthetic resin material such as polyamide or polyimide as shown in FIGS. Paper or a thin metal plate may be used. As a material for the diaphragm of the speaker of the present invention, a synthetic resin material such as polypropylene, polyamide, or polyimide is preferably used, but paper or a thin metal plate may be used.

Further, in the special-purpose speaker, when the amplitude is expected to increase, the diaphragms 1, 2, ...
If a corrugation portion having a compliance action is formed in the extension portion of the frame 8, that is, the portion to be attached to the frame 8 or the magnetic circuit 36, and it is fixed to the frame 8 or the magnetic circuit 36 via them, it is possible to cope with a large amplitude. There is no distortion.

In the loudspeaker of the fifth invention having the sectional structure shown in FIG. 13, diaphragms 201, 202, 2 each having a vertically split cylindrical shape are provided.
Each of the joints 212, 2 formed by arranging 03, 204 integrally in parallel and connecting the adjacent straight sides thereof.
23, 234, and 241 are radially arranged, four pieces are arranged in parallel back-to-back, and a three-dimensional resin diaphragm as illustrated in FIG. 14 is radially integrally formed.

Further, the drive unit 26 is formed such that the magnetic circuits are arranged so that the magnetic gaps 6b, 6c, 6d, and 6e are radially arranged back to back. Then, voice coils are inserted and arranged in the magnetic air gaps 6b, 6c, 6d, 6e of the drive unit 26, and the voice coil bobbins 44, 45, 46, 4 are inserted.
7 facing the end 44a, 44a; 45a, 45a; 4
Because of the structure in which 6a, 46a; 47a, 47a are fixedly attached, all four curved diaphragms are arranged with their curved surfaces facing outward.

The drive unit 26 is composed of the diaphragms 201, 20.
Joints 212, 223, 23 with 2, 203, 204
4, 241 are arranged radially, and the diaphragms 201, 20
The speakers are suspended in the magnetic air gaps 6b, 6c, 6d, 6e by the rigidity of 2, 203, 204 themselves and the damper. Such diaphragms 201, 202,
A thermoplastic synthetic resin is used for 203 and 204, and FIG.
If it is integrally formed by drawing as shown in (3), it becomes advantageous in terms of quality and cost.

The structures of the fourth and fifth inventions (FIG. 11,
The speakers 12, 13, 14) act as an ideal omnidirectional cylindrical speaker as a so-called breathing speaker that expands and contracts in the radial direction, and is suitable as a high-tone or medium-tone speaker. . In this case, it goes without saying that the vibrating plates 101, 102, 1
03, 104; 201, 202, 203, 204 so that the vibration directions of expansion and contraction are in the same direction,
It is necessary to make the winding directions of the voice coils of the drive units 26 and 36 opposite to each other, or to adjust the magnetic field direction of the magnetic gap.

Typical directional characteristics of the speaker of the present invention are compared with those of the conventional dome tweeter, as shown in FIG. 15 (the speaker of the present invention) and FIG. 16 (the conventional dome speaker).
At the upper treble limit (upper characteristic curve: thick solid line),
The conventional speaker (Fig. 16) drops sharply from 20000Hz, but the speaker of the present invention (Fig. 15) has 30,000H.
It extends beyond z. Regarding the directional characteristics, at 30 ° off (thin solid line), the speaker of the present invention is not far from the on-axis characteristic curve, whereas the conventional speaker (FIG. 16) is already attenuated from 10000 Hz.
Even at 60 ° off (thin dotted line), the treble limit (300
It is obvious that the conventional speaker falls from around 8000 Hz, while the attenuation is not close to (00 Hz or more). From this characteristic, it is clear that the directional characteristic of the speaker of the present invention is broad and excellent.

Regarding the distortion characteristic (lower characteristic curve), both the second harmonic (shown by a thick solid line) and the third harmonic (thin solid line) show the speaker of the present invention (the lower characteristic curve in FIG. 15). ) Has a much smaller value than the conventional speaker (the lower characteristic curve in FIG. 16). As described above, the speaker of the present invention is a high-class speaker having extremely excellent characteristics as compared with the conventional speaker.

Although the examples considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structures of these examples, and is provided with the above-mentioned constitutional requirements of the present invention, and The present invention can be carried out by appropriately modifying it within a range that achieves the object of the present invention and has the following effects.

[0030]

As is apparent from the above description, the speaker having the structure of the present invention is a speaker provided with a so-called kamaboko-shaped vertically divided cylindrical diaphragm, and can be called a center drive type planar speaker. Broad directional characteristics, excellent acoustic radiation efficiency, distortion characteristics with less harmonic distortion, effective space factor, etc. that cannot be expected from conventional cone-type diaphragm speakers, even from the acoustic radiation principle. It has come to have a remarkable effect that it can have various excellent properties.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a speaker of the first invention.

FIG. 2 is a vertical sectional view taken along the line II-II in FIG.

FIG. 3 is a vertical cross-sectional view (cross-sectional view taken along the line III-III in FIG. 1) of the embodiment of the speaker in which the drive unit of the first invention is eccentrically attached.

FIG. 4 is a vertical sectional view taken along the line IV-IV in FIG.

FIG. 5 is a transverse cross-sectional view of an embodiment showing multiple driving of the same diameter voice coil of the second invention.

6 is a vertical sectional view taken along the line VI-VI of FIG.

FIG. 7 is a front view showing an embodiment of a speaker that represents multiple driving of different diameter voice coils of the second invention.

8 is a vertical cross-sectional view taken along the line VIII-VIII of FIG.

FIG. 9 is a transverse cross-sectional view showing an exploded structure of the present third invention speaker.

10 is a vertical cross-sectional view taken along line XX of FIG.

FIG. 11 is a cross-sectional view of an application example of the present invention speaker shown in FIG.

FIG. 12: XII-X of the two back-to-back speakers shown in FIG.
II is a vertical sectional view.

FIG. 13 is a cross-sectional view of a breathing cylinder type speaker of the present invention in which magnetic gaps are radially arranged.

FIG. 14 is a perspective view of the diaphragm of FIG.

FIG. 15 is a diagram showing directional characteristics and distortion characteristics of the speaker of the present invention.

FIG. 16 is a diagram showing directional characteristics and distortion characteristics of a conventional dome type speaker.

FIG. 17 is a first diagram of Japanese Patent Publication No. 32-7807 showing a structure of a speaker as a prior art.

[Explanation of symbols]

1,2; 101,102,103,104; 201,2
02,203,204 Vertically divided cylindrical diaphragm 1a, 2a; 101a, 102a, 103a, 104
a; 201a, 202a, 203a, 204a Straight part 1e, 2e Edge 12,112,123,134,114; 212,22
3,234,214 Joining parts 4,4 ', 4 "; 44,45,46,47 Voice coil bobbins 4a, 4a', 4a", 44a, 45a, 16a, 47
a facing part 14 driving voice coil 26 driving part 6; 6b, 6c, 6d, 6e magnetic circuit 7 top plate 8 frame 9 vibrating part

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[Procedure amendment]

[Submission date] January 20, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 17

[Correction method] Change

[Correction content]

FIG. 17

Claims (8)

[Claims] 1. Vibrating plates 1 and 2 each having a vertically divided cylindrical shape are integrally arranged in parallel and formed, and on a joining portion 12 line connecting adjacent straight side portions 1a and 2a of the vibrating plates 1 and 2, A frame in which the opposing portions 4a, 4a at the tip of the driving voice coil bobbin 4 are attached and fixed, and the edges 1e, 2e of the diaphragms 1, 2 are attached to the top plate 7 of the magnetic circuit 6 having the annular magnetic gap 6b. 8 is a speaker fixed to the frame 8 by extending to the same position as the height of the joint portion 12 or a position lower than that. 2. The speaker according to claim 1, wherein the opposing portions 4a, 4a at the tip of the drive voice coil bobbin 4 are provided on the joint 12 line connecting the adjacent straight sides 1a, 2a of the diaphragms 1, 2. , A speaker that is attached and fixed so as to be offset from the center of the joint 12. 3. The loudspeaker according to claim 1 or 2, wherein a plurality of driving voice coil bobbins 4 having the same diameter are provided on a joint 12 line connecting the adjacent straight sides 1a and 2a of the diaphragms 1 and 2. Opposing portions 4a, 4 at the tip of 4 '
A speaker in which a'is attached and fixed in series symmetrically on the 12th line of the joint part. 4. The speaker according to claim 1 or 2, wherein a plurality of driving voice coil bobbins 4 having different diameters are provided on a joint 12 line connecting the adjacent straight sides 1a and 2a of the diaphragms 1 and 2. Opposing portions 4a, 4 at the tip of 4 "
A speaker in which a '' is attached and fixed in series on the joint 12 wire. 5. The speaker according to any one of claims 1 to 4, wherein the diaphragms 1 and 2 having a vertically split cylindrical shape are integrally arranged in parallel in a closed circumferential direction. The adjacent straight sides 1a and 2a are connected to each other to join the joint 1
A driving unit 2 including a vibrating unit 9 forming a frame 2 and a frame 8 and a magnetic circuit 6 having a driving voice coil 14.
A speaker having a configuration in which 6 and 6 are separately formed, and both are integrally joined. 6. The speaker according to any one of claims 1 to 5, wherein the diaphragm 1 has a vertically split cylindrical shape.
01, 102, 103, 104 are formed by integrally arranging them in parallel in a closed circumferential manner, and the adjacent straight part 101
a, 102a, 103a, 104a are connected to join part 1
Vibration plate 10 forming 12,123,134,114
A speaker in which 1,102,103,104 are molded from a single material. 7. The speaker according to any one of claims 1 to 6, wherein the diaphragm 2 has a vertically split cylindrical shape.
01, 202, 203, and 204 are formed by integrally arranging them in parallel in a closed circumferential manner,
a, 202a, 203a and 204a are connected to each other, and the diaphragms 201, 202, 203 and 204 forming the joints 212, 223, 234 and 214 are formed of polyamide,
A speaker integrally molded with a synthetic resin material such as polyimide. 8. The diaphragm according to any one of claims 1 to 6, wherein the diaphragm 2 has a vertically split cylindrical shape.
01, 202, 203, and 204 are formed by integrally arranging them in parallel in a closed circumferential manner, and adjacent straight sides 20 thereof are formed.
1a, 202a, 203a, 204a are formed by connecting the joints 212, 223, 234, 214, and the magnetic poles are joined back to back to form the magnetic gaps 6b, 6c, 6d,
6e radially arranged and formed in the drive unit 26 formed in the radial direction. Opposing portions 44a, 44a; 45a, 45a; 46a, 46a at the tips of the voice coil bobbins 44, 45, 46, 47;
A speaker to which 47a and 47a are attached and fixed.