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(July 200, May 1, 1974, title of the invention & inventor (1) Description 1) ■ Japan Patent Office
■ JP 50-1435220 published Japan 50. (1975)11.1915! -65 "55 specification 1,
title of the invention 1, title of the invention dome-type loudspeaker diaphragm and method of
manufacturing the same
f-ム λ C-bird esim song and σ its production method 2, the number of inventions as claimed
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm of a
dome-shaped speaker and a method of manufacturing the same. In the experiment of the
diaphragm of the dome-shaped speaker, the oval-carved vibrating plate is reduced in weight and
thickness in the case of the dome-shaped speaker no. The rigidity was improved by reducing the
weight of the diaphragm, and the number of peaks and valleys decreased. On the other hand,
third-order distortion increases in the middle and high frequencies of the reproduction band. In
addition, if the diaphragm is made heavier against the reduction in weight, the f characteristic of
Vc12000) h or less is aggravated in addition to the disadvantage of the decrease in efficiency.
The following can be said by such an experiment. By the weight reduction of the diaphragm> The
compliance of the diaphragm is rising, and the compliance with the compliance is more than
12000 Hz that an effective effect appears. It is also inferred from the fact that it is difficult for
the current EndPage: 1 to be hard with a heavy and hard diaphragm. In the thin and light
diaphragm, the loss of the diaphragm is large, and this is an improvement in the f characteristic.
If the diaphragm is heavy and the loss is small at 9 o'clock, standing waves are generated in the
diaphragm and the f characteristic is deteriorated. At this time, since the equalizer has an effect
at the top of the diaphragm for the improvement of the f4I property, the phase of the top is
opposite to the phase of the junction of the voice coil at the antiresonance frequency. In any case,
it is clear that there is a problem at the top of the diaphragm. The increase in strain due to the
reduction in the weight of the diaphragm is generally clarified in the prior art as a problem of air
permeability and third-order distortion of paper cone paper, and therefore it is necessary to take
measures against air flow. Can be seen. The problem at the top of the diaphragm described above
is not limited to the oval diaphragm, but also to the diaphragm of a circular dome-shaped
speaker. The present invention, in view of the above-described dead point, proposes vibration 1
[O improvement of a dome-shaped speaker and a method of manufacturing the same.
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing the use, and the diaphragm 1 is made of a fibrous
material and has a weir configuration so as to become thicker from the top 2 to the peripheral
part 3. In the figure, 4 indicates a pole piece, 5 indicates a top plate, 6 indicates a voice coil, and
7 indicates an edge. In the case of the present invention, the f411 property is remarkably
improved as compared with the general one shown by a as shown in FIG. From these facts, it is
found that the compliance of the junction of the voice coil and the diaphragm has a great
influence on the anti-resonance in the high region, and the improvement by adopting such a
configuration is the oval dome-shaped diaphragm The present invention is applicable not only to
circular dome-shaped diaphragms but also to obtain thick diaphragms not only for paper
diaphragms but also for diaphragms of other materials.
The diaphragm of the present invention can be made of a fibrous material and can be shaped
into the above-described shape, but an example of a method of manufacturing the diaphragm by
a lamination method will be described. As shown in Fig. 3, the ring-shaped contact piece 1b is
made of a paper fiber material. This can be easily done by looking at the central part of the net.
The ring-shaped joint piece 1b is polymerized on the inner side of the dome-shaped vibrating
plate main body 1a, suitably dewatered, semi-dried, thermoformed in a dry state, and the
thickness is increased from the top to the periphery Get the board. Even in this state, both are
closely bonded, but in order to further increase the adhesive strength, one agent is impregnated.
Can also cause nine effect ° of Me prospect as K by aeration measures to moderate the
concentration in the solvent of the adhesive, when according to the third order distortion
bonding method O described above help reduce its Of course, the manufacturing method is
simple, and the diaphragm main body (upper layer) for sufficient loss and the ring-shaped joint
piece (lower layer) which must have strength as well are combined with different materials.
Therefore, there is an advantage that the effect of the purpose can be further enhanced by
appropriately processing one or both of them. The loss can be properly adjusted by sizing the
above-described dome-shaped diaphragm having paper fibers as a main component in the
manufacturing process. Some sizing agents have various effects, but even among them, the filling
agent exhibits a good effect. This method is less likely to cause specific fixed resonance than the
resin size, and among the fillers, light metal oxides are superior in specific gravity. For example,
aluminum oxide and titanium white are commonly used and fixed with aluminum sulfate. Within
20-, the paper strength hardly changes, and when it exceeds 30-, the strength suddenly becomes
weak. Therefore, 30-4 or less is excellent also in sound quality. Next, to describe the embodiment,
FIG. 4 is a schematic cross-sectional view of a dome-shaped speaker, wherein the diaphragm 1 is
composed of a diaphragm main body 1m and a ring-shaped joint piece 1b. It is nine things by.
Diaphragm main body 1 is ground with wood pulp and aluminum is sized properly for EndPage:
2. The ring-shaped eating piece 1b is wood pulp only. The impregnating agent is vinyl chloride,
vinyl acetate-co-heavy metal, and a two-phase oval diaphragm. The same reference numerals as
in FIG. 1 denote the same parts as in FIG. -Treating (steel ring 0, 3), 8 magnet, 9 pack plate, 1G
glass wool, respectively.
The sound pressure frequency characteristics of the dome-shaped speech force according to the
ninth embodiment are shown in FIG. As is apparent from this figure, O which is sized by light
metal oxide and exhibits excellent effects such as flattening of frequency characteristics of nine
diaphragms, broadening of bandwidth, improvement of distortion characteristics, etc.
1 is a cross-sectional view showing an embodiment of a diaphragm of a dome lid speaker
according to the present invention, FIG. 4 is a cross-sectional view showing a large-diaphragm O
embodiment according to the present invention, and FIG. II: Diaphragm main body, lb: 9 cornerlike joint pieces, 2: top, 3: peripheral edge, 4: pole piece, 5 Nido tab plate, 6: py coil, 7: edge, 8:
magnet, 9: pack plate. 1st screen 1st page 躬 EndPage: 3
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