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JPS52162136

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS52162136
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a speaker, FIG. 2 is a
sectional view of a conventional dustproof camp, and FIG. 3 is a sectional view of the dustproof
camp of the present invention. 2 is a diaphragm, 4 is a voice coil bobbin, 3 is a dustproof camp,
32 is a circulation hole, 33 is a cylindrical standing portion, and 34 is a dustproof cloth.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a dome shaped dust cap of a speaker disposed at the center of a diaphragm. As shown in FIG.
1, a conventional cone / cone speaker has a voice coil bobbin 4 in which a voice coil 3 is wound
around a central portion of a diaphragm 2 whose peripheral portion is fixed to the outer
periphery of the frame 1 The three leaves 9/3 乙 2 or the voice coil bobbin 4 disposed on the
magnetic gap 7 formed by the pole 9 and the plate 6 are held by the gumba 5 so as to be
disposed at the center of the voice coil 3 or the magnetic gap 7 There is. Furthermore, in order to
prevent iron powder, dust and the like from entering the magnetic gap 7 through the voice coil
bobbin 4 and to reinforce the diaphragm center portion, the dome-shaped dustproof cap 8 is
attached to close the upper end opening of the voice coil bobbin 4 It is done. ド ー ム Such a
dome-shaped dustproof cap is usually obtained by forming a film of breathable cloth, paper or
the like, but in the case of a cloth, the effect of reinforcing the central part of the vibrating plate
2 can not be expected and only the dustproof effect is possible. In the case of J or paper which
can not appear, both dustproof and reinforced fruit appear, but especially in the case of a large
aperture speaker (woofer) etc., the amount of air in the dome-shaped dustproof cap 8 is much
integrated with the diaphragm 2 In order to solve such a defect that has the disadvantage that it
circulates in the air or the narrow IA magnetic air gap 7 when it vibrates and the braking force
by the braking resistance acts to adversely affect the vibration mode, as shown in FIG. As shown
in Fig. 3, a flow hole 22 is provided at the center of the paper-made dome-shaped dustproof cap
21 and the flowproof hole 23 is closed, and a dustproof cloth 23 or the like that has air
permeability is attached. , Dustproof and reinforcing effects, and Kihe '/ Bed air in 21 there is a
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comb to suppress the occurrence of Seitako resistive structure to and out flow to the atmosphere
through Bokabuto fabric 23. However, in such a structure, the dome central portion of the domeshaped dustproof canozo 21 is rigid or weak in the vibration direction, and the flow hole 22 is
provided in the central portion of the dome, and the peripheral portion of the flow hole 22
becomes one end. Once the rigidity becomes extremely weak, the peripheral part of the flow hole
22 resonates near the high-resonance frequency of the diaphragm 2, and superimposing it on
unnecessary diaphragmatic sound or the diaphragm 20 radiation sound to produce a peak in
frequency characteristics, It has the drawback that it has a very bad influence on hearing. This
device is a speaker that solves the drawbacks in the conventional example H at once, which will
be described in detail with reference to FIG. In FIG. 3, reference numeral 2 denotes a cone
diaphragm, and a dome-shaped dustproof cap 31 is disposed at the center thereof.
The dustproof cap 81 has a through hole 32 at the center of the dome, and a cylindrical upright
portion 33 formed by bending the periphery of the through hole 32 vertically and an air vent
attached to keep the through hole 32 cold. It has a dustproof cloth 34 with a characteristic.
According to such a structure, the peripheral portion of the flow hole 32 is reinforced by the
cylindrical standing portion 33, and the rigidity can be significantly increased. The rigidity of the
diaphragm 2 that does not resonate with the vibration of the diaphragm 2 can be obtained. it
can. Therefore, such a dome-shaped dustproof cap 31 exhibits a dustproof and diaphragm
reinforcing effect, and since air freely enters and exits through the dustproof cloth 34 attached to
the flow hole 32, the braking action by the air in the dome-shaped cap 31 is Since the rigidity of
the peripheral edge of the through hole 32 is extremely high, the resonance of the peripheral
portion is suppressed to a large extent, and it is possible to obtain a loudspeaker having good
frequency characteristics. Thus, this invention is a dustproof and vibration plate which is the
original purpose of the dustproof cap without deteriorating the frequency characteristics of the
speaker by a simple @ structure in which a cylindrical rising portion is formed around the flow
hole of the dome shaped dustproof cap. The reinforcement effect can be sufficiently realized, and
has practically excellent advantages.
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