JPH09163491A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker, with which divided resonance hardly occurs, flat frequency characteristics are provided and sound quality is improved, concerning the speaker in slender structure to be used for various kinds of acoustic equipment. SOLUTION: The shape of a diaphragm 13 is made into axially asymmetrical shape having major diameter direction and minor diameter direction, the shape of a voice coil bobbin 18a for driving the diaphragm 13 is made axial asymmetrical similarly to the diaphragm as well, and a slit 18b is provided at the winding part of a voice coil 19. Thus, the resonance frequency f0 is suppressed low, the reproduction of low sound range is enables, the voice coil bobbin 18a is prevented from being deformed by temperature increase, and voice distortion can be reduce as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker having an elongated structure used in audio equipment.

[0002]

2. Description of the Related Art FIG. 7A to FIG.
This will be described with reference to (c). 7A and 7B are configuration diagrams of a conventional speaker having an elongated structure. FIG. 7A is a plan view, FIG. 7B is a cross-sectional view in the major axis direction, and FIG. 7C is a cross-sectional view in the minor axis direction. . In the figure, reference numeral 1 is an elongated diaphragm that generates air vibrations, and an edge 3 is joined to the outer peripheral portion of the diaphragm and is held by the frame 10 via the edge 3. A voice coil bobbin 6 is fixed to the center of the diaphragm 1 and is held on a frame 10 via a damper 4 so as to be able to vibrate freely.

On the other hand, in the central recess of the frame 10,
A magnetic circuit 11 including a yoke 7, a magnet 8, and a plate 9 is provided. Then, the voice coil 12 wound around the voice coil bobbin 6 is held in the gap of the magnetic circuit 11, the voice coil bobbin 6 makes a piston motion by the driving current, and the diaphragm 1 vibrates in that direction, and as a result, the diaphragm 1
A sound wave is emitted from.

[0004]

However, the conventional speaker as described above has the following problems.
That is, since the driving method of driving the central portion of the elongated diaphragm 1 (point driving) is adopted, split resonance in the major axis direction is likely to occur. As a result, in the middle and high frequencies, a peak or a dip occurs on the frequency characteristic of the reproduced sound pressure, resulting in deterioration of the sound quality. Further, the width of the drive system including the magnetic circuit 11 and the voice coil bobbin 6 becomes smaller than the length of the minor axis of the speaker,
It is physically impossible to increase the diameter of the voice coil bobbin 6, and the line length of the voice coil 12 cannot be increased.

Further, since the volume of the magnet 8 is limited to be small, the magnetic flux density B in the air gap cannot be sufficiently secured. As a result, the force coefficient (B × L) of the drive system becomes small, making it difficult to increase the conversion efficiency.

The present invention has been made in view of the above-mentioned conventional problems. In spite of its narrow width (slender structure), split resonance is unlikely to occur and a flat frequency characteristic is obtained, and conversion efficiency is improved. The purpose of the present invention is to obtain a loudspeaker having an excellent sound quality that is capable of reproducing in the low frequency range by increasing the resonance frequency (f ₀ ) to a low level.

[0007]

A speaker of the present invention is a non-axisymmetrical plan view having a major axis and a minor axis when viewed from the vibration direction, and at least some of the straight lines are parallel to each other in the major axis direction. A voice coil bobbin forming a part, a voice coil wound around the coil bobbin, a magnetic circuit for giving a magnetic flux to the voice coil, and a slit provided in a straight line portion of the voice coil bobbin wound around the voice coil. .

With this configuration, split resonance can be prevented, frequency characteristics can be flattened, and bass characteristics can be improved. Further, changes in the shape of the voice coil bobbin caused by different thermal expansion coefficients of the voice coil and the voice coil bobbin can be suppressed. It is possible.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of the loudspeaker according to claim 1 of the present invention includes a non-axisymmetric diaphragm having a major axis and a minor axis as viewed in the vibration direction, and A bonded voice coil bobbin, a voice coil wound around an outer peripheral surface of the voice coil bobbin, a magnetic circuit for giving a magnetic flux for vibration to the voice coil, and a slit provided in a voice coil winding portion of the voice coil bobbin. With this configuration, split resonance is prevented, frequency characteristics are flattened, bass characteristics are improved, and further, the voice coil bobbin generated due to the different thermal expansion coefficients of the voice coil and the voice coil bobbin. The shape change can be suppressed.

According to a second aspect of the present invention, a non-axisymmetric diaphragm having a planar shape having at least a major axis and a minor axis as viewed in the vibration direction, a voice coil bobbin bonded to the diaphragm, and the voice. A voice coil wound around the outer peripheral surface of a coil bobbin, a magnetic circuit for giving a magnetic flux for vibration to the voice coil, a box-shaped frame for housing this magnetic circuit, and an outer peripheral portion connected to the frame, A part connected to an outer peripheral portion of the voice coil bobbin and a damper for holding the voice coil bobbin,
Not only can the rigidity of the voice coil be increased,
It is possible to prevent rolling. Further, since the damper is adhered to the entire circumference of the voice coil bobbin and fixed to the frame, the damper can be softened, and the corrugation can be deepened to improve the linearity.

An embodiment of the present invention will be described below with reference to FIGS. (Embodiment 1) FIG. 1 is an exploded perspective view, and FIG. 2 shows a structure of a voice coil which is an essential part of the present invention.
(A) is the top view seen from the lower side, (b) is the side view of the major axis direction. In the figure, 13 is a substantially track-type diaphragm that generates air vibration, which is a non-axisymmetric type having a major axis direction and a minor axis direction, and has a semi-cylindrical bulge in the vibration direction. . The edge 15 is joined to the outer periphery of the diaphragm 13, and the outer peripheral portion of the edge 15 is held by the frame 22. Further, the diaphragm 13 is the connecting member 1
It is also held by a damper 16 connected to the frame 22 via 7. Reference numeral 14 is a diaphragm reinforcing paper provided on the back surface of the diaphragm 13.

A voice coil bobbin 18a having the same contour as the outer periphery of the diaphragm 13 is fixed to the diaphragm 13, and a voice coil 19 is wound around the lower end. The frame 22 is formed in a box shape, the side surface thereof is bent into a rectangle along the edge 15, and the bottom surface thereof has a rectangular shape. Then, a yoke 21 and a magnet 20 for forming a magnetic circuit are attached to the bottom surface of the frame 22. A voice coil bobbin 18a is provided with a slit 18b, and a voice coil 19 is bonded to the voice coil bobbin 18a. Voice coil bobbin 18a
Is made of kraft paper, aluminum, resin or the like, and the voice coil 19 is mainly made of copper wire.

As described above, the substantially track (slender) type diaphragm 13 is used, and the voice coil bobbin 18a around which the voice coil 19 is wound has the same elongated shape, preventing split resonance, flattening the frequency characteristic, and lowering the sound. In addition to improving the characteristics, the voice coil 1 of the voice coil bobbin 18a
Since the slit 18b is provided in the winding portion of 9, the deformation due to the difference in the thermal expansion coefficient between the voice coil 19 and the voice coil bobbin 18a caused by the temperature rise of the voice coil 19 is prevented, and the vibration of the voice coil 19 is correctly transmitted to the diaphragm 13. It is possible to reduce the distortion of sound.

(Embodiment 2) FIG. 3 is an exploded perspective view, FIG. 4 shows a structure of a voice coil bobbin which is an essential part, (a) is a plan view seen from below, (b) is a plan view. FIG. 5 is a side view in the major axis direction, FIG. 5 shows a configuration of a voice coil bobbin which is an essential part of an application example, (a) is a plan view seen from below, and (b) is a side view in the major axis direction. is there.

In the description, the same parts as those in the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted. The difference from the first embodiment is that the voice coil bobbin is replaced with the damper 16 and the connecting member 17. With the entire circumference of 24
The point is that a damper 23 is attached between the frames 22. The voice coil bobbin 24 is not provided with the slit 18b like the voice coil bobbin 18a of the first embodiment.

As described above, by providing the damper 23 around the voice coil bobbin 24, the rigidity of the voice coil bobbin 24 can be increased, and the damper 23 is adhered to the entire circumference of the voice coil bobbin 24 and fixed to the frame 22. Therefore, the flexibility of the damper 23 can be made softer, the corrugation of the damper 23 can be deepened, and the linearity can be improved. Further, since the planar shape of the voice coil bobbin 24 viewed from the vibration direction is a non-axisymmetrical shape having a major axis and a minor axis, the distance from the center becomes long especially in the major axis direction, but the damper 23 is provided around the voice coil bobbin 24.
Since the damper 23 is fixed to the frame 22, the rolling can be prevented.

5A and 5B show the damper 25.
Is provided at both ends of the voice coil bobbin 24 in the major axis direction and is fixed to the frame 22 also by the damper 25, so that the rolling can be prevented.

(Third Embodiment) FIG. 6 is an exploded perspective view showing the features of the first and second embodiments.

That is, the voice coil bobbin 18a is provided with the slit 18b similar to that of the first embodiment and the damper 23 similar to that of the second embodiment (the damper 16 and the connecting member 17 of the first embodiment are provided. Not provided.)

Therefore, the third embodiment has the features of the first and second embodiments, and the rigidity of the voice coil bobbin 18a can be increased by the damper 23 provided on the outer periphery of the voice coil bobbin 18a. In addition, the slit 18b provided in the voice coil bobbin 18a can suppress the deformation of the voice coil bobbin 18a even if the temperature rises. Further, the occurrence of rolling can be suppressed and the linearity can be improved.

[0021]

As described above, according to the present invention, in which the voice coil bobbin is provided with the slit, the split resonance can be prevented, the frequency characteristic can be flattened, the bass characteristic can be improved, and the temperature of the voice coil can be increased. This prevents deformation of the voice coil bobbin due to the noise, accurately transmits the vibration of the voice coil to the diaphragm, and reduces the distortion of sound.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a structure of a speaker according to an embodiment of the present invention.

FIG. 2 (a) is a plan view showing the structure of a voice coil bobbin, which is the main part, and (b) is a side view in the same major axis direction.

FIG. 3 is an exploded perspective view of a speaker according to another embodiment.

FIG. 4A is a plan view of a voice coil bobbin, which is the main part, and FIG. 4B is a side view in the same major axis direction.

5A is a plan view of a voice coil bobbin showing an application of the embodiment of FIG. 3, and FIG. 5B is a side view of the same major axis direction.

FIG. 6 is an exploded perspective view of another embodiment.

7A is a plan view of a conventional speaker, FIG. 7B is a side sectional view in the same major axis direction, and FIG. 7C is a side sectional view in the same minor axis direction.

[Explanation of symbols]

 13 Vibration plate 16 Damper 18a Voice coil bobbin 18b Slit 19 Voice coil 20 Magnet 21 Yoke 22 Frame 23 Damper 24 Voice coil bobbin 25 Damper

Claims (2)

[Claims] 1. A non-axisymmetric diaphragm having a major axis and a minor axis in a planar shape viewed at least in a vibration direction, a voice coil bobbin bonded to the diaphragm, and a coil wound around an outer peripheral surface of the voice coil bobbin. And a slit formed in a voice coil winding portion of the voice coil bobbin. 2. A non-axisymmetric diaphragm having a major axis and a minor axis in a planar shape viewed at least in a vibration direction, a voice coil bobbin adhered to the diaphragm, and a coil wound around an outer peripheral surface of the voice coil bobbin. Voice coil, a magnetic circuit for giving a magnetic flux for vibration to the voice coil, a box-shaped frame for housing this magnetic circuit, an outer peripheral portion connected to the frame, and an inner peripheral portion for the outer periphery of the voice coil bobbin. And a damper that is connected to the voice coil bobbin and holds the voice coil bobbin.