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JPS5092750

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DESCRIPTION JPS5092750
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are sectional views of a conventional
dome speaker, FIG. 3 is a sectional view of a conventional inner peripheral driving type dome
speaker, and FIG. 4 is an internal peripheral driving type of the present invention Fig. 5 is a
cross-sectional view of the dome speaker, and Fig. 5 is an embodiment of the present invention.
The dome 41, ..., dome diaphragm, 3 ..., voice coil bobbin, 8, ..., ring dog connection plate is there.
-105-Judo 50-92750 (2) Teradoo (α) + 5ru-106-〆 · ヘ
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an
inner circumference driven dome speaker. In the conventional dome speaker, as shown in FIG. 1,
a voice fill bobbin 3 is attached near the boundary between the outer periphery of the dome
portion 1 and the peripheral flat portion 2, and the voice coil 4 wound around the povin 3 is
between the plate 5 and the center pole 6. The structure was disposed in the magnetic air gap 7
formed in the second embodiment. With the above-described conventional structure, if the
acoustic radiation surface is made large, that is, the bore diameter of the dome portion 1 is
increased (the diameter of the voice coil bobbin 3 inevitably increases, the mechanical strength
of the voice coil bobbin 3 is increased. Is not enough, and it has P5 o C which has a point (lll 11
cm) which is not good enough such as gap displacement and deformation of the dome portion 1
against severe vibration. When the diameter of the monocycle voice coil bobbin 3 is increased,
the driving force is reduced to cause a decrease in the magnetic efficiency. Therefore, the size of
the magnetic circuit is increased and the manufacturing cost is increased. Conventionally, various
attempts have been made to solve this drawback, but it has not been solved sufficiently. For
example, as shown in FIG. 2, a chevron 22 'is provided on the inner periphery of the center
portion of the edge portion 22 and the outer periphery of the dome diaphragm 21 is attached to
the outer peripheral inclined portion so as to coincide with the inclined portion. Vertically bend
the innermost circumference of '' Speaking of I 轡 i of the structure pasted on the chair coil
bobbin, the strength of the part of the chevron 22 'in the direction of movement and horizontal
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direction is insufficient Therefore, the deformation of the dome diaphragm 21 during vibration
or the radial deformation of the voice coil bobbin 3 can not be sufficiently prevented, and the
diameter of the dome diaphragm is too large in comparison with the diameter of the voice coil
bobbin 3 There is a disadvantage that the acoustic radiation efficiency can not be sufficiently
increased because it can not be taken. Further, as shown in FIG. 3, the voice coil bobbin 3 is
directly fixed to the inner periphery of the dome diaphragm 31 and the small diameter voice coil
bobbin 3 and the large diameter dome diaphragm 31 are driven to increase the acoustic
radiation efficiency. , So-called inner circumference drive type dome speaker has an advantage
that the diameter of the dome diaphragm 31 can be taken large by J, 9 compared to the voice
coil bobbin Oniko, or quasi chair coil revision) bobbin 3 and dome diaphragm 31 As a result of
concentration of the driving force on the fixed part of the dome diaphragm 31, deformation of
the dome diaphragm 31 is not easy and adhesion is also difficult and it is difficult to peel off. The
driving part is the dome i-shaped sloped part, so the driving part! The mechanical strength of 4 is
not sufficient, so that as the vibration frequency becomes higher, the phase of the drive part and
its outer peripheral part fades, and the drive energy or the whole dome diaphragm 31 is not
transmitted, so the high frequency The reproduction becomes difficult, and an unnecessary peak
or the like is generated in the frequency characteristic to significantly impair the sense of
hearing.
75, this invention. よ、イXヨイ2. よ、7(。 By fixing to the dome diaphragm via the fixed IJ
", l" 4ti "," H "connection plate, the drive part of the dome diaphragm is provided at a location
larger in diameter than the voice coil bobbin diameter, and the mechanical strength is relatively
strong. The disadvantage of the above-mentioned conventional circumferentially-driven dome
speaker is solved by driving the peripheral portion having a large gradient with respect to the
vibration direction. The present invention will be described in more detail with reference to FIG.
4. The inner peripheral edge of the ring-shaped connecting plate 8 is fixed to the upper outer
periphery of the voice coil bobbin 3 and the outer peripheral edge of the ring-shaped connecting
plate Fix to According to this structure, compared with the conventional structure in which the
voice coil bobbin 3 is directly fixed to the dome diaphragm 31, the peripheral inner periphery of
the dome diaphragm 41, that is, the gradient is larger than that via the ring connection plate 8.
The mechanical strength of the drive part of the dome vibration teaching 41 is significantly
increased because it is attached to the part, and the conventional dome diaphragm 31 generates
a drive energy loss differently from the phase of the vibration in the drive part and its periphery.
On the other hand, the driving energy transmitted from the voice coil bobbin 3 is transmitted to
the whole of the diaphragm 41 without being unnecessarily tasted at the dome diaphragm 41
driving portion, so that high frequency reproduction is easy. There is almost no possibility of
deformation of the part. Next, the embodiment of FIG. 5 will be described. FIG. 5 ('fa' P uses a
ring-shaped connecting plate 8a of cross-section type and FIG. 5 (b) uses a ring-shaped
connecting plate 8b of T-shaped section Any one of them is for keeping the fixation to the voice
coil bobbin 3 ° more effectively, and the essential "one → lotus"-in the same manner as in the
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ring-shaped connecting plate of FIG. is there. The material of the In plate or the weir plate 8 is a
light weight and has a high Young's modulus. As described above, the inner drive dome speaker
according to the present invention has insufficient mechanical strength of the conventional inner
drive dome speaker or dome diaphragm and voice coil bobbin fixing portion, deformation of the
dome and frequency response, or In contrast to the difficulty in reproducing the high frequency
band, the use of the ring-shaped connecting plate ensures the mechanical strength of the drive
portion of the dome diaphragm 41, and makes the sound reproduction conditions better. Further,
since it acts as a reinforcing ring of the connection plate 8 or dome diaphragm and the voice coil
bobbin 3, the occurrence of deformation of the dome diaphragm 41 and deformation of the voice
coil bobbin 3 at the time of vibration is prevented and generation of abnormal amount due to gap
deviation etc. effectively It has the advantage that it can be prevented and good tones can be
reproduced.
In addition, since it is possible to mount a voice coil bobbin smaller than the diameter of the
dome diaphragm because it is of the inner peripheral drive type, the magnetic circuit can be
effectively used and the size can be reduced. Therefore the cost is reduced. It has excellent
advantages such as being able to do it. 4, Brief description of the surface 7 Figure 1 is a crosssectional view of a conventional dome speaker, Figure 3 is a cross-sectional view of a
conventional inner peripheral driving dome speaker, Figure 4 is an inner peripheral driving type
of the present invention FIG. 5 is a sectional view of the dome speaker, and FIG. 5 is an
embodiment of the present invention. 41 is a dome diaphragm, 3 is a voice coil bobbin 8 is a
ring-shaped connection plate. Heat e \ 1 year old / /, also 4-/ 1267 \ / 4 / year old z 1 death 93
+ 734 / to the side 27504 ○ 417. 袢 袢 霞 4 ね 2% ·,% □ □ 才 3 (シ) (シ) シ 76 q 76 n
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