JPH0315399B2 - - Google Patents

Description

[Detailed Description of the Invention] "Object of the Invention" (Industrial Application Field) The present invention relates to a dome-shaped speaker, and particularly to a dome-shaped speaker that can simplify the assembly process and improve performance. be.

(Prior Art) A conventional dome-shaped speaker is constructed as shown in the sectional view of FIG. 5A and the partially enlarged view of FIG. 5B. In the figure, reference numeral 20 denotes an external magnetic circuit section, which consists of a yoke 21, a center pole 22, a magnet 23, a top plate 24, etc. Each member is fixed with adhesive, but when forming the gap 25, A jig having a cylindrical portion for the gap is fitted onto the center pole 22, and the top plate 2
4 is glued and fixed. Reference numeral 30 denotes a vibration system, in which a dome-shaped diaphragm 31 and a coil bobbin part 32 are integrally formed and a curved edge part 33 is separately bonded thereto, or a dome-shaped diaphragm 31 and an edge part 33 are integrally formed. Attach the coil bobbin part 32 to this
There are also those with glued on. During assembly, the outer periphery of the edge portion 33 is placed on the mounting step portion 26 formed on the top plate 24 so as to be held between the damper members 27, 27, thereby placing the voice coil 34 at a predetermined position within the gap 25. At least the frame 40 can be broken, but a jig is also used when placing the voice coil within the gap.

We have prototyped a full-range vibration system that integrates a dome-shaped diaphragm, a coil bobbin, and an edge extending from its lower end.
However, there are some reports that it is not practical.

(Problems to be Solved by the Invention) In the conventional dome-shaped speaker shown in FIGS. 5A and 5B described above, various jigs are used in each assembly process. Because it is necessary to set the clearance,
These clearances, dimensional tolerances of each part, variations in work, etc. lead to uneven volume errors, which cause the gap spacing to become large or uneven, resulting in decreased performance. In addition, in conventional dome-shaped speakers, adhesives are used to fix each component, which requires time to dry and solidify, which not only causes time loss in the assembly process, but also causes distortion due to the use of adhesives. There were flaws.

Furthermore, when using the integrated diaphragm according to the above report, the magnetic circuit has a complicated structure, such as the top plate being divided, and the structure in which the vibration system is incorporated into the above magnetic circuit is complicated. There are some drawbacks such as:

In general, for speakers whose voice coil amplitude is small, such as speakers for mid-high range, there is no need to set the gap depth that large; rather, the gap should be made uniform and as narrow as possible. It is.

The present invention has been made from this point of view, and its purpose is to eliminate the drawbacks of the conventional dome-shaped speaker described above, and to simplify the assembly of each component without using adhesives or jigs. Moreover, it can be assembled accurately, and the gap can be made as narrow as possible to increase the magnetic flux density, and the gap interval can be made uniform to make the magnetic flux distribution uniform.
The object of the present invention is to provide a dome-shaped speaker with improved performance.

"Structure of the Invention" (Means for Solving Problems) A dome-shaped speaker according to the present invention includes a dome-shaped diaphragm, a coil bobbin part, and an edge part extending horizontally from the lower end of the dome-shaped diaphragm, which are integrally formed. A guide portion for arranging the edge is formed in a portion of the inner circumferential edge of the top plate located on the magnet side, and the outer circumferential edge of the edge portion is fitted so as to come into contact with the back wall of the guide portion. The magnetic circuit section can be assembled and the vibration system can be set in place by holding the top plate between the edge holding members and tightly fitting a part of the guide section formed on the top plate into the engaging section provided on the upper outer periphery of the center pole. This allows the placement and placement to be performed at the same time.

(Function) A magnetic member is arranged on the yoke, and with the edge part of the dome-shaped diaphragm being held between the edge holding members, it is fitted and set into the guide part formed on the top plate, and the engagement provided on the upper outer periphery of the center pole is set. A part of the guide portion formed on the top plate is positioned and press-fitted into the top plate. As a result, the magnetic member is clamped and fixed between the yoke and the top plate, and a portion of the guide portion of the top plate is tightly fitted into the engaging portion of the center pole, so that the top plate is accurately fixed, while the diaphragm is The outer periphery of the edge portion is centered and set while being guided by the inner wall of the guide portion, the voice coil is accurately set within the gap, and the edge portion is held between the edge holding members. When the magnet member is magnetized in this assembled state, the yoke and top plate are attracted and fixed more firmly.

When assembling as described above, no adhesive is required and there is no loss of time for drying and solidifying, and the assembly process can also be simplified. Moreover, by assembling as described above, a predetermined gap is automatically formed between the outer peripheral surface of the upper end of the center pole and the inner peripheral surface of the top plate.
No jig or the like is used to form this gap, and the outer circumference of the edge of the dome-shaped diaphragm is guided by the back wall of the guide portion of the top plate and is automatically centered, allowing the voice coil to form the gap. Since it is automatically set at a predetermined position within the center pole and there is no need for a jig to set the diaphragm, etc., there is no need to set unnecessary gap intervals. The dimensions can be set so that the minimum gap required for movement of the coil bobbin and voice coil is formed. This makes it possible to increase the magnetic flux density and improve efficiency, and the gap formed as described above becomes uniform over the entire circumference, making the magnetic flux distribution uniform and reducing distortion etc. be able to.

(Example) The first example of the dome-shaped speaker according to the present invention is
The explanation will be based on the figures to FIG. 4. FIG.
The figure is an enlarged partial cross-sectional view of the same as the above, and FIG. 3 is a partial cross-sectional view showing an example in which a notch is provided at the lower part of the stepped portion serving as the engaging portion.
FIG. 4 is a cross-sectional view of a case where a pipe or ring of a predetermined height made of a non-magnetic material is arranged around the outer periphery of the center pole as an engaging portion.

In the figure, 1 is an outer magnet type magnetic circuit section,
It is formed by a yoke 2, a center pole 3, a magnet 4, and a top plate 5. Reference numeral 10 denotes a vibration system, which includes a dome-shaped diaphragm 11, a coil bobbin section 12, an edge section 13 extending horizontally from the lower end of the coil bobbin section 12, and a voice coil 14.

In the present invention, basically, the dome-shaped diaphragm 11, the coil bobbin part 12, and the edge part 13 extending horizontally from the lower end thereof are integrally formed, and the inner circumferential edge of the top plate 5 on the magnet 4 side A guide portion 6 for arranging the edge, in the embodiment, a stepped portion 6a is formed on the inner circumferential edge of the lower end, and the outer circumferential edge 15 of the edge portion 13 is formed on the guide portion 6.
are fitted together and sandwiched between edge pressing members 16, 16 made of flexible materials, etc., and a part of the guide portion 6 formed on the top plate 5, in this embodiment, the lower inner peripheral edge of the step portion 6a, is attached to the center pole 3. By tightly fitting into the engaging portion 7 provided on the upper outer periphery, assembly of the magnetic circuit portion 1 and placement of the vibration system 10 at a predetermined position can be performed at the same time. As a result, the magnetic gap 8 is formed without using a jig or the like, and the voice coil 14 is automatically placed in the correct position within the magnetic gap 8.

Various means are possible for providing the engaging portion 7, and in the example shown in FIGS. 1 and 2, a stepped portion 3a is formed on the upper outer periphery of the center pole 3, and the outer periphery of the stepped portion 3a is formed as the engaging portion. 7. The step portion 6 of the top plate 5 is attached to the outer peripheral edge of the step portion 3a.
When tightly fitting the lower edge of a, in the embodiment, the fitting depth is set to be approximately 0.5 mm.

In the example shown in FIG. 3, a notch 9 is formed in the lower part of the step 3a of the center pole 3, and the step 3 is
A has a flange shape, and the magnetic resistance of the stepped portion 3a is increased.

In the example of FIG. 4A, a pipe 3b of a predetermined height made of a non-magnetic material is placed around the outer periphery of the center pole 3, and
In FIG. 4B, rings 3c made of non-magnetic material are press-fitted and their upper outer peripheries serve as engaging portions 7. Note that the above-mentioned engaging portion 7 partially (at least 2
The top plate 5 may be partially fixed thereby. In the figure, 2a is the yoke 2
This is a positioning step formed on the upper surface of the magnet 4, and if the inner peripheral edge of the magnet 4 is placed on the step, centering accuracy of the magnet 4 can be obtained. In the figure, 17 is a frame.

Next, an assembly example will be described. The edge portion 13 is fitted into the stepped portion 6a of the top plate 5 via an edge pressing member 16, and the edge portion 13 is further held between another edge pressing member 16. When the edge portion 13 is fitted into the stepped portion 6a, its outer peripheral edge is guided by the back wall of the stepped portion, so that the diaphragm is automatically centered. Next, after placing the magnet member 4 on the yoke 2, the step portion 6 is
a Position the inner peripheral edge of the lower end on the engaging portion 7 provided on the center pole 3 and press fit. As a result, the magnetic member 4 is clamped and fixed between the yoke 2 and the top plate 5, and the inner peripheral edge of the lower end of the top plate 5 is tightly fitted into the engaging portion of the center pole 3, so that the top plate is properly fixed. Thus, a predetermined magnetic gap 8 is formed without using any jig or the like, and the voice coil 14 is automatically placed at a predetermined position within the magnetic gap 8. The magnet member 4 is assembled as described above.
When magnetized, the yoke 2 and top plate 5 are attracted and fixed more firmly.

Note that the dome-shaped speaker with the above configuration has a sealed type on the back side of the diaphragm, but it can be used as a back pressure by providing a horn cavity B in the center pole 3 as shown by the imaginary line in Figure 1. You can also.

"Effects of the Invention" According to the dome-shaped speaker according to the present invention, the magnetic member is arranged on the yoke, and the edge part of the dome-shaped diaphragm is fitted into the guide part formed on the top plate with the edge part held between the edge pressing members. By positioning and press-fitting a part of the guide part of the top plate into the engaging part provided on the outer periphery of the upper part of the center pole, the magnet member is clamped and fixed between the yoke and the top plate, and the guide part of the top plate is fixed. A part of the diaphragm can be tightly fitted into the engaging part of the center pole to securely fix the top plate, while the outer periphery of the edge part of the diaphragm is guided by the back wall of the guide part when the centering set is performed. Since the voice coil is properly set within the gap and the edge portion is held between the edge holding members, the magnetic gap can be formed and the diaphragm can be properly arranged.

In addition, when assembling as described above, there is no need for adhesive and there is no time loss for drying and solidifying, and the assembly process can be simplified.
Moreover, since there is no need for jigs, etc. for forming the magnetic gap or centering the diaphragm, there is no need to set unnecessary gap intervals, and when setting the dimensions for setting the magnetic gap, the coil bobbin and voice coil are It can be set so that the minimum gap required for movement is formed.
This makes it possible to increase the magnetic flux density and improve efficiency, and the gap formed as described above becomes uniform over the entire circumference.
The magnetic flux distribution becomes uniform, and distortion and the like can be reduced.

[Brief explanation of drawings]

1 to 4 show examples of the dome-shaped speaker according to the present invention, FIG. 1 is a sectional view of the dome-shaped speaker showing the basic form, FIG. 2 is a partially enlarged sectional view of the same, and FIG. 3 Figure 4 is a partial cross-sectional view showing an example in which a notch is provided at the bottom of the stepped part that is the engaging part, and Figure 4 shows a case where a pipe or ring of a predetermined height made of a non-magnetic material is arranged around the outer periphery of the center pole as the engaging part. FIG. 5A and 5B show a conventional dome-shaped speaker, where A is a sectional view and B is a partially enlarged sectional view. 1: Magnetic circuit section, 2: Yoke, 3: Center pole, 4: Magnet, 5: Top plate,
6: Guide part, 6a: Step part as guide part, 7: Engagement part, 8: Magnetic gap, 10: Vibration system, 11:
Dome-shaped diaphragm, 12: coil bobbin, 13: edge portion, 14: voice coil, 15: edge outer periphery, 16: edge pressing member.

Claims (1)

[Claims] 1. The dome-shaped diaphragm, the coil bobbin part, and the edge part extending horizontally from the lower end thereof are integrally molded, and a guide part for arranging the edge is formed in the part of the inner periphery of the top plate located on the magnet side. The outer periphery of the edge part is fitted into the guide part and held by the edge pressing member, and a part of the guide part formed on the top plate is an engaging part provided on the upper outer periphery of the center pole. A dome-shaped speaker characterized by being tightly fitted.