JPH0368300A - Voice coil bobbin of solid structure - Google Patents

Abstract

PURPOSE:To attain high strength and to minimize the disturbance onto a magnetic field by providing a radial slit to a center pole and a magnet and a cylindrical cavity to the center. CONSTITUTION:A radial slit 7 is provided to a center pole 6 and a magnet 8 of an inner magnet type magnetic circuit to avoid interference with a reinforced rib 3. Moreover, a cylindrical cavity 9 is provided to the center of the center pole 6 and the magnetic circuit to avoid interference with a sub voice coil bobbin 2. A stereoscopic structure voice coil bobbin 1 is formed in a way of thrusting into the magnetic circuit through above contrivance.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a dynamic speaker, which is one of audio equipment (prior art and problems to be solved by the invention). I had a big problem with the voice coil hobbin 1.

That's because of the voice coil hobbin 1.

This was because they were faced with two contradictory demands.

In other words, the voice coil hobbin 1 must have considerable strength, in part because of its function of supporting the single-winding coil 4 in a cylindrical shape.

But on the other hand, the voice coil hobbin 1.

The fact is that it is in a position that disrupts the magnetic field between the center pole 6 and the plate 17.

As is well known, in a dynamic speaker, the force that drives the diaphragm is based on the magnetic force between the center pole 6 and the plate 17. In that sense, this magnetic force is applied to the winding coil 4 as effectively as possible. It needs to be influenced.

From that point of view, the voice coil hobbin 1 must be as thin as possible.In other words, the voice coil hobbin 1 must be both thin and strong.4 Of course, 5.Use excellent materials. By doing so, it is possible to satisfy these contradictory issues to a certain extent.

However, even if we tried to resolve this contradiction by simply improving the materials, there were limits to this.

Its limitations were particularly apparent in large-diameter speakers.

That is, in order to accurately vibrate the large-diameter diaphragm 5, it is desirable that the voice coil hobbin 1 also have a large diameter.

However, at the same time, when a voice coil hobbin 1 with a large diameter is manufactured, its thickness inevitably becomes thicker, and the thicker voice coil hobbin 1 is formed between the center pole 6 and the plate 17. 2 This is undesirable because it leads to a reduction in the driving efficiency of the speaker.

Therefore, in the conventional technology, as a practical countermeasure.

The following solutions have been taken: One method is to use a small-diameter voice coil hobbin 1 even for large-diameter dynamic speakers.With this method, the problem of speaker drive efficiency can be solved. . However, the large diameter diaphragm 5 is driven by the small diameter voice coil hobbin 1.

However, the vibration characteristics of the diaphragm 5 are inevitably inaccurate.

Another solution is to forcibly introduce a large-diameter voice coil hobbin 1 that matches the large-diameter diaphragm 5.

With this method, it can be expected that the vibration characteristics of the diaphragm 5 will be accurate. However, at the same time, a disadvantage of using the thick voice coil hobbin 1 is that in this case, the driving efficiency of the speaker drops to a significantly low level.

As described above, the conventional voice coil hobbin 1 with a simple shape clearly has its limitations when manufacturing a large-diameter dynamic speaker. It is an object of the present invention to provide a new type of voice coil hobbin 1 that eliminates the above-mentioned contradictions that the hobbin 1 has.

(Means and effects for solving the problems) In order to solve one or more problems in the present invention, first of all, the voice coil hobbin is made to have an extremely three-dimensional structure. Only the voice coil hobbin has 7 three-dimensional t
Merely making it a complete structure will cause various inconveniences and will never solve the above-mentioned problems.

Therefore, in the present invention, we have devised a unique idea for the structure of the magnetic circuit section corresponding to the voice coil hobbin.

1 to 3 are drawings of the invention according to claim 1.

FIG. 1 is a perspective view of the entire invention according to claim 1.

In this case, the three-dimensional voice coil hobbin part is drawn as protruding from the magnetic circuit to make its shape easier to understand;

It will be installed in such a way that it will be buried within the magnetic circuit at the bottom.

2 and 3 are a front view and a side view, respectively, of the invention of claim 1. FIG.

As can be seen from these figures, in the present invention, the voice coil hobbin section has a very three-dimensional structure.

Its specific structure is as follows.

That is, first of all, inside a normal voice coil hobbin 1, there is a sub-voice coil hobbin 2 whose diameter is one size smaller than that of the normal voice coil hobbin 1.

Next, these two voice coil hobbins were arranged radially with respect to the central axis of the entire magnetic circuit.

The three-dimensional structure made up of these three types of elements, to which the plate-like ETO 11 and reinforcing rib 3 are connected, functions as a whole equivalent to a single conventional voice coil hobbin.

In other words, it plays the role of supporting the single-turn coil 4 in the correct position within the magnetic circuit, and at the same time being connected to the diaphragm 5 to drive it.

Further, in the present invention, the shape of the magnetic circuit is also devised to correspond to the voice coil hobbin having one or more three-dimensional structures.

That is, first of all, radial slits 7 are provided in the center pole 6 and the magnet 8 of the internal magnetic circuit in order to avoid interference with the first reinforcing rib 3.

Also, in order to avoid interference with the sub-voice coil hobbin 2, the center pole 6 and the center of the magnet 8 of the internal magnetic circuit are placed.

A cylindrical cavity 9 is provided.

By implementing these measures, the three-dimensional voice coil hobbin mentioned above can be installed in such a way that it just fits into the magnetic circuit.

Figures 2 and 3 clearly show that the three-dimensional voice coil hobbin is cleverly recessed within the magnetic circuit.

These efforts have brought about the following advantages to the present invention.

That is, the voice coil hobbin itself has an extremely three-dimensional shape with high strength, as described above. Therefore, this type of voice coil hobbin can fully fulfill its role even if it is machined to a large diameter L2.

At the same time, however, in this invention, the thinness of the part located between the center pole 6 and the plate 17 of the voice coil hobbin (the part that interferes with the magnetic field) remains the same as that of the conventional type.

Therefore, in the present invention, the driving efficiency of the magnetic circuit is not inferior in the slightest to that of the conventional magnetic circuit.

In other words, in the present invention, the strength is truly high.

Furthermore, we have succeeded in obtaining such a voice coil hobbin that interferes with the magnetic field within the magnetic circuit to a minimum extent.

The invention of claim 2.3.4 is an advanced version of the invention of claim 1, and the basic principle is similar to the invention of claim 1, so the explanation thereof will be omitted.

(Implementation M) FIGS. 9 and 10 are a front view and a side view of an embodiment in which the invention of claim 1 is combined with a cone-shaped diaphragm. In this case, the diaphragm 5 and the three-dimensional voice The coil hobbin is connected to the sub-voice coil hobbin 2 at the upper end thereof. However, in carrying out the invention of claim 1, there is only one connection point between the two.4 For example, when a flat diaphragm is introduced, one three-dimensional voice coil hobbin is used. It is also possible to connect through all the upper ends, which would be more effective in obtaining accurate vibration motion7).

Further, the same can be said about the location where the damper 20 is attached.

That is, in FIGS. 9 and 10, the damper 20 is attached to the outside of the voice coil hobbin 1.
However, it is also possible to attach this to the sub voice coil hobbin 2, and two types of dampers 2 can be attached to both the voice coil hobbin 1 and the sub voice coil hobbin 2 at the same time.
It is also possible to take 0 and subtract 1.

It can also be said that these are free options when implementing the invention of claim 1. Claim 2,
Regarding the method of carrying out the invention in 3.4, the same thing that can be said about the invention in claim 1 is generally applicable, so it will be omitted here. <Effects of the invention> As described above, 1. .

It has a large F diameter and high strength, and the degree of interference with the magnetic field in the magnetic circuit is minimal.

It becomes possible to obtain such a voice coil hobbin.

First of all, this was previously thought to be unrealistic from the standpoint of efficiency.

This will enable the emergence of large-diameter cone-shaped speakers.

Further, a dynamic speaker having a dome-shaped diaphragm or a flat diaphragm requires a voice coil hobbin with a larger diameter compared to the diameter of the diaphragm, even among other dynamic speakers.

Therefore, with the introduction of the present invention, the maximum aperture of these types of loudspeakers will also be significantly increased.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the invention according to claim 1, in this case. The three-dimensional voice coil section, which is depicted as protruding upward, is originally sunk into the magnetic circuit section below. FIG. 2 is a front view of the invention according to claim 1. FIG. 3 is a side view of the invention according to claim 1. FIG. 4 is a perspective view of a type having an internal magnetic circuit according to the invention of claim 3, and like FIG. 1, the three-dimensional voice coil hobbin section is shown protruding upward; FIG. 5 is a front view of a type of the invention according to claim 3, particularly having an internal magnetic type magnetic circuit section. FIG. 6 is a side view of a type having an inner magnet type magnetic circuit part, especially among the invention of claim 3. FIG. The front view FIG. 8 is a side view of a type of the invention according to claim 3, particularly having an outer magnet type magnetic circuit section. FIG. 9 uses the invention of claim 1. FIG. 2 is a front view of an embodiment of a dynamic speaker having a cone-shaped diaphragm. FIG. 10 uses the invention of claim 1. A side view of a dynamic speaker with a cone and a diaphragm. 1 Voice coil hobbin 2 Sub voice coil hobbin 3, reinforcement rib 41 winding coil 5, diaphragm
6. Center pole 7 Radial slit 8
．． Magnet 9, cylindrical cavity 10. Second reinforcing rib 11 Inner sub voice coil hobbin 12, Inner reinforcing rib 13 Outer voice coil hobbin 14, Outer sub voice coil hobbin 15. 6 18. ] 9. 20° outer reinforced rib inner slit 17. Plate outer slit second inner reinforced rib damper

Claims (1)

[Scope of Claims] 1. In the magnetic circuit of a dynamic speaker which is an audio device, 2. Inside the normal voice coil hobbin 1, there is a cylindrical shape having the same shape as the voice coil hobbin 1, and its diameter. There is a sub voice coil hobbin 2, which is slightly smaller than the former. B. The voice coil hobbin 1 and the sub-voice coil hobbin 2 are connected by reinforcing ribs 3, which are plate-like elements arranged radially with respect to the central axis of the entire magnetic circuit. C. The three-dimensional structure composed of the above three types of elements functions as a whole equivalent to a conventional voice coil hobbin alone. That is, while holding the wire-wound coil 4, the vibration plate 5 is driven by vibrating the inside of the magnetic circuit in an assumed direction. D. In order to avoid interference with the above three-dimensional structure, the center pole 6 is provided with radial slits 7 corresponding to the positions of the reinforcing ribs 3. E. Furthermore, when an internal magnetic type magnet is used, the magnet 8 is also provided with radial slits 7 corresponding to the positions of the reinforcing ribs 3, if necessary. F. A cylindrical cavity 9 corresponding to the position of the sub-voice coil hobbin 2 is provided in the center of the center pole 6. Further, when an internal magnetic type magnet is used, the magnet 8 is also provided with a cylindrical cavity 9 corresponding to the position of the sub-voice coil hobbin 2, if necessary. The voice coil hobbin, center pole, and magnet of the dynamic speaker consists of the above configuration. 2. In addition to the structure of claim 1, the sub-voice coil hobbin 2 and the central axis of the entire magnetic circuit are further provided with plate-like elements arranged radially with respect to the central axis, and second reinforcing ribs 10. Connect with. The voice coil hobbin, center pole, and magnet of a dynamic speaker consists of the above configuration. 3. In the magnetic circuit of a dynamic speaker, which is an audio device, a. Inside the normal voice coil hobbin 1, there is a coil that has the same cylindrical shape as the voice coil hobbin 1, and whose diameter is one size larger than that of the former. A small inner sub-voice coil hobbin 11 is present. (b) The voice coil hobbin 1 and the inner sub-voice coil hobbin 11 are plate-like elements arranged radially with respect to the central axis of the entire magnetic circuit, and inner reinforcing ribs 12.
Then, connect. C. Outside the normal voice coil hobbin 1, there is an outer voice coil hobbin 13 which has the same cylindrical shape as the voice coil hobbin 1 and whose diameter is slightly larger than the former. This element is closely attached and joined to the winding coil 4 from the outside. As a result, the winding coil 4 is tightly sandwiched between the two outer and inner voice coil hobbins. D. Outside the outer voice coil hobbin 13, there is an outer sub-voice coil hobbin 14, which has the same cylindrical shape as the outer voice coil hobbin 13 and has a diameter slightly larger than the former. E. The outer voice coil hobbin 13 and the outer sub-voice coil hobbin 14 are connected by an outer reinforcing rib 15, which is a plate-shaped element arranged radially with respect to the central axis of the entire magnetic circuit. F. The three-dimensional structure made up of the above six types of elements functions as a whole equivalent to a conventional voice coil hobbin alone. That is, while supporting the wire-wound coil 4, the vibration plate 5 is driven by vibrating in a predetermined direction within the magnetic circuit. In order to avoid interference with the inner reinforcing ribs 12, a radial slit, an inner slit 16, corresponding to the position of the inner reinforcing ribs 12 is cut into the center pole 6. Furthermore, if an internal magnetic type magnet is used, the magnet 8 may also be provided with inner reinforcing ribs 12, if necessary.
A radial slit or inner slit 16 corresponding to the position is carved. In order to avoid interference with the inner sub-voice coil hobbin 11, a cylindrical cavity 9 corresponding to the position of the inner sub-voice coil hobbin 11 is provided at the center of the center pole 6. Furthermore, when an internal magnetic type magnet is used, the magnet 8 is also provided with a cylindrical cavity 9 corresponding to the position of the inner sub-voice coil hobbin 11, if necessary. In order to avoid interference with the outer reinforcing ribs 15, the plate 17 is provided with radial slits or outer slits 18 corresponding to the positions of the outer reinforcing ribs 15. Furthermore, if an outer magnetic type magnet is used, the magnet 8 may also have radial slits and outer slits 1 corresponding to the positions of the outer reinforcing ribs.
8 is provided. The voice coil hobbin, center pole, plate, and magnet of the dynamic speaker consists of the above configuration. 4. In addition to the structure of claim 3, the inner sub-voice coil hobbin 11 and the central axis of the entire magnetic circuit,
They are connected by second inner reinforcing ribs 19, which are plate-like elements arranged radially with respect to the central axis. The voice coil hobbin, center pole, plate, and magnet of the dynamic speaker consists of the above configuration.