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JPS5092751

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPS5092751
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views of a
conventional dome spiniker, FIG. 3 is a cross-sectional view of a conventional inner
circumference one drive type dome speaker, and FIG. Sectional view of a domed loudspeaker. 41
is a dome diaphragm, 3 is a voice coil bobbin, and 8 is a ring-shaped thin plate connection plate. 107- Judo 50-92751 (2) cochlea-ios-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an
inner circumference driven dome speaker. In the conventional dome speaker, a voice coil bobbin
3 is attached near the boundary between the outer periphery of the dome portion 1 and the
peripheral flat portion 2 as shown in FIG. 1, and the voice coil 4 wound around the povin 3 is
placed between the plate 5 and the center pole 6 It had the structure arrange | positioned in the
formed magnetic space | gap 7. FIG. With the above-described conventional structure, if the
acoustic radiation surface is made large, that is, if the diameter of the dome portion 1 is
increased, the diameter of the voice coil bobbin 3 inevitably becomes large. Therefore, the
mechanical strength of the voice coil bobbin 3 is increased. Defective iI! Such as gap
displacement and deformation of dome part l due to severe vibration which is not enough. I had a
drawback that ilk. When the diameter of the voice coil bobbin 3 is increased, the driving force is
decreased to cause a decrease in the magnetic efficiency. Therefore, the size of the magnetic
circuit is increased and the manufacturing cost is increased. Heretofore, various attempts have
been made to solve this shortcoming, or it has not been sufficiently solved. For example, as
shown in FIG. 2, a chevron 22 'is provided on the inner periphery of the center portion of the
edge 22 and the outer periphery of the dome diaphragm 21 is attached to the outer peripheral
inclined portion in alignment with the inclined portion. In the case of the structure in which the
innermost circumference of the 22 'is bent vertically and stuck to the upper side of the voice coil
bobbin, the three dome vibration is due to insufficient strength in the vibration direction and
horizontal direction of the portion of the chevron 22'. It is possible to sufficiently prevent
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deformation of the plate 21 when it vibrates and deformation of the voice coil bobbin 3 in the
radial direction, and since the diameter of the dome diaphragm can not be made much larger
than the diameter of the voice coil bobbin 3 It has left the saddle point that efficiency can not be
improved. First, as shown in FIG. 3, the voice coil bobbin 3 is fixed directly to the inner periphery
of the dome diaphragm 31 and the small diameter voice coil bobbin 3 drives the large diameter
dome diaphragm 31 to increase the acoustic radiation efficiency. The so-called inner drive dome
speaker has an advantage that the diameter of the dome diaphragm 31 can be made larger than
the diameter of the voice coil bobbin, but the driving force is applied to the fixed portion of the
voice coil bobbin 3 and the dome diaphragm 31 As a result, the dome diaphragm 31 is easily
deformed and adhesion is also difficult, and the peeling and shielding defect is 1 ′ ′ ° 1 ° 6 ·
In addition, the driving portion of the dome diaphragm 31 has a dome-shaped slope The
mechanical strength of the drive part is not sufficient, so that as the vibration frequency is
increased by 4, the phase between the drive part and its outer peripheral part is shifted, so And it
is difficult to reproduce the high frequency band once it has been transmitted to the full
frequency band and it becomes difficult to reproduce the high frequency band, and it has the
disadvantage of producing unnecessary peaks etc. in the frequency characteristic and
significantly impairing the sense of hearing. ing.
In the present invention, the ring-shaped thin plate connecting plate 8 is attached to the outer
periphery of the voice coil bobbin 3 near the tip end of the voice coil bobbin 3 whose tip is fixed
to the inner periphery of the dome diaphragm 41. The outer periphery of the ring-shaped thin
plate connecting plate 8 is the inner periphery of the dome diaphragm 41 By fixing to the slanted
/ parts, the drive parts are dispersed in two places, thereby solving the drawbacks of the inner
periphery driven dome speaker of the above-mentioned conventional example. Detailed
description of the present invention will be made in more detail with reference to FIG. 4-1) nail
fixed to a local portion in the dome dome diaphragm 41) nail mace coil bobbin material having a
large Young's modulus, eg, synthetic resin The inner peripheral edge of the ring-like thin plate
connection plate 8 made of a molded product, Vulcanized fiber 1 is fixed, and the outer
peripheral edge of the ring-like thin plate connection plate 8 is fixed to the inner wall surface of
the inner diaphragm inclined portion of the dome diaphragm 41. According to this structure,
compared to the conventional structure in which only the upper end of the voice coil bobbin 3 is
fixed to the dome diaphragm 41, the voice coil bobbin 3 is dispersed at two points, the drive
portion or the front end of the voice coil bobbin and the outer peripheral edge of the ring-like
thin plate connection plate 8. Equivalently, the strength of the drive portion is increased, and the
voice vibration of the conventional dome diaphragm 31 is different from that of the drive portion
in its periphery to 19 侶 of the vibration to generate a drive energy loss. The driving energy
transmitted to the dome diaphragm 41 is transmitted to the whole of the diaphragm 41 without
being lost due to the drive of the dome diaphragm 41, so the reproduction of the high region is
easy, and the dome portion is hardly deformed. I do not know. As described above, the inner
drive dome speaker of the present invention does not have sufficient mechanical strength of the
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dome diaphragm and the voice coil bobbin fixing portion in the conventional inner drive dome
speaker, and deformation of the dome and frequency characteristics of I5. One letter i, oh, yes,
highs. The mechanical strength of the drive part of the dome diaphragm 41 is secured by fixing
the tip of the voice coil and using the ring A / pin 5 connection plate while the reproduction is
difficult. Make the sound reproduction condition 6 good. Also, since it acts as a reinforcing ring
for the connection plate 8 or dome diaphragm and the voice coil bobbin 73, the occurrence of
deformation of the dome diaphragm 41 and deformation of the voice coil bobbin 73 during
vibration is prevented, and abnormal noise is generated due to cab displacement or the like. It
has the advantage that it can be effectively prevented and good tones can be reproduced. In
addition, since it is an inner peripheral drive type, a voice coil bobbin smaller than the diameter
of the dome diaphragm can be attached), so the magnetic circuit can be effectively used and the
small-type can be made. Therefore, it has excellent advantages such as cost reduction.
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