JP3208211B2 - Speaker and speaker assembling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention aims at improving the conversion efficiency by improving the compliance in the low frequency range and reducing the leakage magnetic flux, and also prevents the plating failure due to the accumulation of the plating solution during the plating process. The present invention relates to a speaker and a method for assembling the speaker.

[0002]

2. Description of the Related Art Most of the loudspeakers currently in practical use are occupied by electrodynamic loudspeakers. This is because the electrodynamic loudspeaker can extend the bass reproduction limit due to its large amplitude, and can achieve considerable efficiency depending on the design.

FIG. 1 shows a cone speaker as an example of an electrodynamic speaker. A ring-shaped magnet 3 is fixed to an upper part of a yoke 2 having a center pole 1. A ring-shaped plate 4 is fixed to the upper part of the magnet 3. Plate 4 and center pole 1
And a coil bobbin 6 around which the voice coil 5 is wound.

[0004] A diaphragm (cone) 7 is provided on the coil bobbin 6.
Is attached. A center cap 8 is provided inside the diaphragm 7. The outer peripheral edge of the diaphragm 7
The speaker frame 10 is held at the opening edge through the edge 9. The ring-shaped plate 4 is attached to the bottom plate 19 of the speaker frame 10 by caulking. In the drawings, reference numeral 11 denotes a ring-shaped packing, and reference numeral 12 denotes a flat damper.

FIGS. 2 to 4 show the speaker frame 10 and the ring-shaped plate 4. A bobbin insertion hole 18 for inserting the coil bobbin 6 and a flat damper are provided at the center of the speaker frame 10. A flat damper mounting portion 13 for mounting the same 12 is provided. A frame arm 15 is provided between the damper mounting portion 13 and the speaker mounting surface 14. The plate 4 is attached to the bottom plate 19 of the speaker frame 10 by caulking.

In the loudspeaker having such a structure, the magnetic flux circulates around the yoke 2, the magnet 3, and the plate 4 constituting the magnetic circuit, so that the magnetic flux is focused on the magnetic gap formed by the plate 4 and the center pole 1. When a voice current flows through the voice coil 5 disposed in the magnetic gap, the diaphragm 7 integrated with the coil bobbin 6 around which the voice coil 5 is wound vibrates.

[0007]

However, in the above-mentioned conventional loudspeaker, the yoke 2, which constitutes a magnetic circuit,
The magnetic flux circulating around the magnet 3 and the plate 4 is applied to the yoke 2
And the plate 4 is leaking. Moreover, when the iron speaker frame 10 is mounted on the plate 4 constituting such a magnetic circuit, the leakage magnetic flux changes from the plate 4 → the speaker frame 10 → the outer peripheral portion of the magnet 3 → the yoke 2. Since the path length is shorter than when the speaker frame 10 is not provided, the leakage magnetic flux increases. As a result, there is a problem that the magnetic flux converged on the magnetic gap decreases and the magnetic efficiency decreases.

Further, when observing the operation of the speaker in a low frequency range, the vibration speed of the diaphragm 7 vibrating by driving the voice coil 5 becomes maximum near the lowest resonance frequency. At this time, air confined in a space surrounded by the cloth flat damper 12, the speaker frame 10 and the coil bobbin 6 moves inside and outside through the texture of the flat damper 12 due to the vibration of the voice coil 5. When the flat damper 12 having a small diameter is used, the flat damper 12 hinders smooth movement of air. As a result, in the vicinity of the lowest resonance frequency, the movements of the diaphragm 7, the flat damper 12, and the voice coil 5, which are vibration systems, are restricted, and the sound pressure level decreases. In addition, such a hindrance to the smooth movement of air causes deterioration of sound quality due to strong nonlinearity.

Further, in the conventional speaker described above, when assembling the speaker frame 10 and the plate 4,
For example, the speaker frame 10 and the plate 4 having the folded portion 4a are manufactured, and separately galvanized, and the plate 4 is attached by caulking the dowel 4b of the speaker frame 10. Here, the zinc plating treatment includes a zinc plating + chromate treatment.

In such an assembling method, since the speaker frame 10 and the plate 4 are individually plated, the number of times of processing becomes a number corresponding to the number of parts, so that the processing is time-consuming. Therefore, there is a problem that the cost is increased.

For this reason, for example, a method is adopted in which, after assembling the speaker frame 10 and the plate 4 in advance, plating is performed at once, thereby reducing the number of times of plating. Began to be reduced.

However, in such a plating method, for example, as shown in FIG. 5, the plating solution 22 is apt to pool at the joint between the bottom plate 19 of the speaker frame 10 and the plate 4. For this reason, in the hot air drying step, which is the final step after the chromate treatment, the accumulated plating solution 22 gradually drops down, for example, as shown in FIG. 6, and the previously formed chromate film is removed. The white liquid dripping pattern peculiar to the plating failure occurs due to the erosion.

[0013] Therefore, when the plating failure occurs as described above, problems such as corrosion of the base material and impairment of the external appearance are caused. The present invention has been made in view of such circumstances, and aims to improve the conversion efficiency by improving the compliance in the low-frequency range and reducing the leakage magnetic flux, and to improve the plating failure due to the accumulation of the plating solution during the plating process. It is an object of the present invention to provide a speaker and a method for assembling the speaker, which can surely prevent the occurrence of the speaker.

[0014]

According to a first aspect of the present invention, there is provided a loudspeaker having a communication hole for connecting the inside of the magnetic circuit and the outside at a joint portion between the speaker frame and a plate constituting the magnetic circuit. And the above speaker flex
Projections project from one side of the arm and one side of the plate
And protruded from one side of the speaker frame .
Crimping the joint portion between the speaker frame and the plate with the projections protruding from the one side of the projection and the plate is formed, the speaker frame and the plate are integrated, the projections the speaker frame and the plate The communication hole is formed by a gap between the speaker frame and the plate caused by being interposed between the speaker frame and the plate.

According to a second aspect of the present invention, there is provided a speaker assembling method, wherein a communication hole for communicating the inside and the outside of the magnetic circuit is provided at a joint between the speaker frame and a plate constituting the magnetic circuit. The method described above.
Projection protruding from one side of the peaker frame and the above plate
Of the speaker frame and the projection protruding on one side of the
With both projections in between with the plate
While forming the above-mentioned joint part by staking,
After integrating the speaker frame and plate,
A plating process is performed on the integrated speaker frame and plate, and plating liquid collected at a joint portion between the speaker frame and the plate is inclined by tilting the speaker frame and the plate. The liquid is discharged to the outside through the communication hole formed by the projection interposed between the plate and the plate.

[0016]

According to the speaker of the present invention, when the voice coil vibrates due to the driving of the magnetic circuit, the communication hole provided at the joint between the speaker frame and the plate constituting the magnetic circuit causes the coil bobbin to move between the coil bobbin and the speaker frame. The cloth damper interposed in the air hole hinders the movement of air and causes air resistance to the vibration of the voice coil, but the air hole is moved by the communication hole, so that the air resistance is reduced and the bass range is reduced. Is played back smoothly.

Also, magnetic flux flows from the plate to the joint portion of the speaker frame through a gap formed by the communication hole provided at the joint portion between the speaker frame and the plate, and as a result, the outer periphery of the magnet is moved from the speaker frame to the speaker frame. Since the magnetic resistance of the path toward the yoke increases, the leakage magnetic flux can be reduced.

Further, since the plating solution collected at the joint between the speaker frame and the plate is discharged to the outside through the communication hole, the plating solution is removed in the hot air drying step, which is the final step after the chromate treatment. In addition, since the erosion of the chromate film due to the dripping of the pool of the plating solution as in the prior art does not occur, the occurrence of plating failure is prevented.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, portions common to FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.

FIGS. 7 and 8 show a speaker frame according to an embodiment of the speaker and the speaker assembling method of the present invention. As shown in these drawings, the speaker frame 10 is provided with a damper attachment portion 13, a speaker attachment surface 14, a frame arm 15, and a bobbin insertion hole 18.

The bottom plate 19 of the speaker frame 10 has
The plate 4 is attached by caulking the dowel 4b. A ring-shaped projection 23 is provided on the joining surface of the bottom plate 19 to the plate 4.

When the plate 4 is attached to the bottom plate 19 of the speaker frame 10, the projection 23
A communication hole 24 is formed between the bottom plate 19 and the plate 4 so as to communicate with the outside.

In the speaker frame having such a configuration,
When assembling the speaker frame 10 and the plate 4, first, the plate 4 is attached to the speaker frame 10 by caulking.

Next, the speaker frame 10 and the plate 4 integrated by caulking are subjected to plating. At this time, the bottom plate 1 of the speaker frame 10
Since a communication hole 24 is formed on the joint surface between the plate 9 and the plate 4 by the projection 23 provided on the plate 4, the plating solution accumulated between the joint surfaces during the plating process may tilt the speaker frame 10. Is discharged to the outside through the communication hole 24.

After the plating process is completed, the speaker frame 10 and the plate 4 are subjected to a chromate treatment, and thereafter, are dried with hot air to form a coating containing zinc chromate on the zinc plating layer.

At this time, the pool of the plating solution on the joint surface between the bottom plate 19 of the speaker frame 10 and the plate 4 is discharged to the outside through the communication hole 24, which is the final step after the chromate treatment. During the hot-air drying step, the accumulated plating solution does not drip, so that an appropriate plating film can be formed without invading the previously formed chromate film.

In the loudspeaker assembled by the above-described method, the magnetic flux circulates around the yoke 2, the magnet 3 and the plate 4 constituting the magnetic circuit, so that the magnetic flux flows through the magnetic gap formed by the plate 4 and the center pole 1. Is converged, and a voice current is caused to flow through the voice coil 5 provided in the magnetic gap, whereby the diaphragm 7 integrated with the coil bobbin 6 around which the voice coil 5 is wound vibrates.

At this time, when the voice coil vibrates due to the drive of the magnetic circuit, the coil bobbin and the speaker frame 1 are connected to each other by the communication hole 24 provided at the joint between the speaker frame 10 and the plate 4 constituting the magnetic circuit.
The damper made of cloth interposed between the vibration damper and the air coil hinders the movement of the air and causes air resistance to the vibration of the voice coil. It is reduced and the reproduction of the bass range is performed smoothly.

FIG. 12 shows the frequency characteristics when the communication hole 24 is provided and when it is not provided. As is clear from FIG. It can be seen that the pressure level has been increased.

At this time, the magnetic flux circulating around the magnetic circuit is, for example, as shown in FIG.
Communication hole 2 provided at the joint portion between plate 0 and plate 4
By flowing from the plate 4 to the joint portion of the speaker frame 10 through the gap of 4, the magnetic resistance of the path from the magnet frame to the yoke from the speaker frame 10 to the yoke increases. FIG. 14 shows the communication hole 2 at the joint between the speaker frame 10 and the plate 4.
FIG. 13 shows a case in which no magnetic flux is provided, and it is apparent from the comparison with FIG. 13 that a large amount of magnetic flux leaks from the plate 4 to the speaker frame 10 as is clear from FIG.

As described above, in this embodiment, when the voice coil vibrates due to the driving of the magnetic circuit, the communication between the coil bobbin and the speaker frame is performed by the communication hole 24 provided at the joint between the speaker frame 10 and the plate 4. The cloth damper interposed between the air holes impedes the movement of air and causes air resistance to the vibration of the voice coil.However, the air holes are moved by the communication holes, so that the air resistance is reduced and the air resistance is reduced. The sound range is reproduced smoothly.

Further, magnetic flux flows from the plate 4 to the joint portion of the speaker frame 10 through a gap formed by the communication hole 24 provided at the joint portion between the speaker frame 10 and the plate 4, so that the outer periphery of the magnet is consequently reduced. Since the magnetic resistance in the path from the speaker frame 10 to the yoke increases, the leakage magnetic flux can be reduced.

As a result of measuring the magnetic flux density flowing through the magnetic gap due to the decrease in the leakage magnetic flux, it is 0.9888 T (tesla) when the communication hole 24 is provided, and 0.9721 T (tesla) when the communication hole 24 is not provided. Tesla). As a result, when the communication hole 24 was provided, the magnetic flux density was increased by 2%.

Further, since the plating solution collected at the joint portion 24 between the speaker frame 10 and the plate 4 is dripped to the outside through the communication hole 24, the hot air which is the final process after the chromate treatment is completed. During the drying process,
Since the erosion of the chromate film due to the dripping of the plating solution as in the prior art does not occur, an appropriate plating film can be formed without eroding the previously formed chromate film.

FIG. 9 shows another embodiment in which the structure of the plating liquid sagging defect prevention mechanism shown in FIG. 7 is changed. A fan-shaped projection 25 is provided on the joint surface of the bottom plate 19 with the plate 4. Is provided. Thus, when the plate 4 is attached to the speaker frame 10 by caulking, the fan-shaped projection 25 abuts on the joint surface of the plate 4 to form a vertically long communication hole 25a.

FIG. 10 shows another embodiment in which the structure of the plating solution sagging defect prevention mechanism shown in FIG. 9 is changed. An arc-shaped projection 26 is provided on the joint surface of the bottom plate 19 with the plate 4.
Is provided. Thereby, the speaker frame 10
When the plate 4 is attached to the plate 4 by caulking, the arc-shaped projection 26 comes into contact with the joint surface of the plate 4 to form a curved communication hole 26a.

FIG. 11 shows another embodiment in which the structure of the plating liquid sagging failure prevention mechanism in FIG. 10 is changed. A semi-circular projection is provided on the joint surface of the bottom plate 19 with the plate 4. 27 are provided. Thus, when the plate 4 is attached to the speaker frame 10 by caulking, the semicircular projection 27 abuts on the joint surface of the plate 4 to form a curved communication hole 27a.

In each of the above embodiments, the projections 23, 25, 2 are formed on the joint surface of the bottom plate 19 with the plate 4.
6 and 27, the bottom plate 19 and the plate 4
A case has been described in which a communication hole 24 that communicates with the outside is formed between the joining surfaces of the first and second members.

[0039]

As described above, according to the loudspeaker and the method of assembling the loudspeaker of the present invention, the magnetic circuit is driven by the communication hole provided at the joint between the loudspeaker frame and the plate constituting the magnetic circuit. When the voice coil vibrates, the cloth damper interposed between the coil bobbin and the speaker frame hinders the movement of the air, causing air resistance to the vibration of the voice coil. , The air resistance is reduced, and the bass reproduction is performed smoothly.

Also, magnetic flux flows from the plate to the joint portion of the speaker frame through a gap formed by the communication hole provided at the joint portion between the speaker frame and the plate, and as a result, the outer periphery of the magnet is moved from the speaker frame to the outer periphery of the magnet. Since the magnetic resistance of the path toward the yoke increases, the leakage magnetic flux can be reduced.

Furthermore, since the plating solution collected at the joint between the speaker frame and the plate is dripped to the outside through the communication hole, the plating solution is removed in the hot air drying step, which is the final step after the chromate treatment. In addition, since the erosion of the chromate film due to the dripping of the pool of the plating solution as in the prior art does not occur, the occurrence of plating failure is prevented.

As a result, it is possible to improve the conversion efficiency by improving the compliance in the low frequency range and the leakage magnetic flux, and it is possible to reliably prevent the plating failure due to the accumulation of the plating solution in the plating process.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cone speaker as an example of a conventional electrodynamic speaker.

FIG. 2 is a plan view showing the speaker frame of FIG. 1;

FIG. 3 is a sectional view taken along line III-III of the speaker frame of FIG. 2;

FIG. 4 is a rear view showing the speaker frame of FIG. 2;

FIG. 5 is a plan view showing a pooling state of a plating solution when a plating process is performed on the speaker frame of FIG. 1;

FIG. 6 is a plan view showing a dripping state of accumulated plating solution in a hot air drying step which is a final step after performing a chromate treatment in the speaker frame of FIG. 1;

FIG. 7 is a plan view showing a speaker frame according to an embodiment of a plating liquid sagging failure prevention mechanism of the present invention.

FIG. 8 is a sectional view taken along line VIII-VIII of the speaker frame of FIG. 7;

FIG. 9 is a plan view of a speaker frame showing another embodiment in which the configuration of the plating liquid sagging failure prevention mechanism of FIG. 7 is changed.

FIG. 10 is a plan view of a speaker frame showing another embodiment in which the configuration of the plating liquid sagging failure prevention mechanism of FIG. 9 is changed.

FIG. 11 is a plan view of a speaker frame showing another embodiment in which the configuration of the plating liquid sagging failure prevention mechanism of FIG. 10 is changed.

12 is a diagram showing frequency characteristics when the communication hole of FIG. 7 is provided and when it is not provided.

FIG. 13 is a diagram showing magnetic flux lines when the communication hole of FIG. 7 is provided.

14 is a diagram showing magnetic flux lines when the communication hole of FIG. 7 is not provided.

[Explanation of symbols]

 Reference Signs List 4 plate 4a folded portion 10 speaker frame 13 damper mounting portion 14 speaker mounting surface 15 frame arm 18 bobbin insertion hole 19 bottom plate portion 23, 25, 26, 27 projection 24, 25a, 26a, 27a communication hole

Continuation of the front page (72) Inventor Satoshi Haya 1105 Nikko, Kuno, Tendo, Yamagata Prefecture Inside Tohoku Pioneer Co., Ltd. (56) Reference Reference

Claims (2)

(57) [Claims] 1. A speaker provided with a communication hole communicating between the inside of the magnetic circuit and the outside at a joint portion between the speaker frame and a plate constituting a magnetic circuit, wherein one side of the speaker frame and the plate are provided. With one side of
Respectively in which protrusions are protruded, caulked by the junction portions between the speaker frame and the plate and projections projecting from the one side and the projection protruding from the one side of the plate of the speaker frame is formed The speaker frame and the plate are integrated with each other, and the communication hole is formed by a gap between the speaker frame and the plate caused by the protrusion interposed between the speaker frame and the plate. A speaker characterized by the above-mentioned. 2. A method for assembling a loudspeaker, wherein a communication hole for connecting the inside and the outside of the magnetic circuit is provided at a joint portion between the speaker frame and a plate constituting a magnetic circuit, wherein one side of the speaker frame is provided. And the projection
The projection protruding from one side of the rate
With the two ends interposed between the
To form the joint by crimping
First, the speaker frame and the plate are integrated.
Then, the plating process is performed on the integrated speaker frame and plate, and a plating solution collected at a joint portion between the speaker frame and the plate is inclined by tilting the speaker frame and the plate. A method for assembling a speaker, comprising: discharging the speaker to the outside via the communication hole formed by the projection interposed between the speaker frame and the plate.