JPS5317717

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DESCRIPTION JPS5317717
The cover for the back chamber of the speaker for medium and high sound is beaten and molded
by paper making, and the cover for the back direction chamber for the speaker for medium and
high sound is characterized.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cover for
forming a chamber on the back of a mid-high tone speaker. Conventionally, as shown in FIG. 21,
a cover 3 obtained by press-forming an iron plate in a cup shape on the back surface of a slip
plate made of baffle plate / rc attached as shown in FIG. There is one in which the chamber S is
provided on the back rM of However, in the case of using an iron plate for the cover 3, 1 surface
plating after pressing is required after the pressing, and it takes time to produce, and thin
materials (0 to 8. During deep drawing of Ol), it is likely to cause resonance □ and resonance.
For this reason, it is necessary to fill the sound absorbing material 6. On the other hand, in the
case of using the cover layer 9 synthetic layer fat in the next case, it can not be formed into a
complicated shape for preventing standing wave generation and resonance at the time of
forming. The sound absorbing material 6 needs to be filled. In any case, as described above, the
cover 3 must be attached to the ski cap by means of a screw, which requires tapping on the ski
cap side. Also, as shown in FIG. 1, the cover 3 in which plywood is combined in a box shape is
fixed to the inner surface of the baffle plate I with the staple needle 7 by using an adhesive
together and the chasoba 5 is provided on the back of the speakerco. There is. Since the opposite
m-planes of the cover 3 are parallel, resonance and resonance occur, and the sound absorbing
material 6 needs to be filled to prevent this. Further, in the case of the closed type acoustic box,
the baffle plate / the front end is required, and the shape and the handling of the square rib
become complicated. In addition, the cover must be assembled in combination with an adhesive
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that requires a degree of sealing, and if the sealing is incomplete, the back of the cover 3 must be
covered with a sound absorbing material & a. In addition to this, although there are conventional
ones using a force of bonding cardboard and a bar, it is difficult to make a large-sized one, and
the filling degree of the sound absorbing material is increased to improve the sealing degree
EndPage: 1. Does the object of the present invention not require any sound absorbing material?
Even if it is used, it is possible to prevent generation, resonance, and resonance of a small
amount of total standing waves, and to obtain the same low-range reproduction range as in the
case of using a conventional cover. An object of the present invention is to provide a cover for
the rear chamber of a medium / high-tone speaker which can be provided with a volume of about
1⁄2, can be easily attached, and can be provided inexpensively. The cover of the present
invention is intended to be beaten from recycled paper in order to couple the above objects, and
to be integrally molded by the paper making system to be l1iI fine.
Embodiments of the invention will be described by means of the drawings. , 1y3 in FIG. 1 /
buffed plate, 2 = bi-force attached to the baffle plate 1; 3 = causes of the invention. The flange 3a
formed at the open end is attached to the inner fiJC of the pan plate 1 by the staple needle 7 by
using an adhesive. j is a chamber provided on the back of the cover by a cover 3, t is an input
terminal, and the cover 3 of the present invention beats the recycled paper, and integrates this
into a cup shape having 7 lungs 3a on a sheet open * by papermaking. It is molded. First, the
waste paper recycled from a newspaper, magazine, etc. is beaten with a degree of beating of Sa of
20 ° SR, as shown in FIG. Inside, make an aqueous solution 10 of 5 cc of waste paper against
100 cc of water. On the other hand, as shown in FIG. B of 1′F 4, prepare a jig 13 having an
infinite number of thin holes l in the convex part 11 and prepare a shape in accordance with the
convex part // fc of the jig 13. Place the f41 da, and let the upper part 173 times pass (only
water and air are allowed to pass, and the peripheral part is completely leakproof. Then, the
aqueous solution 10 is flowed from above the paper making net / I to force suction of water
below the convex part ll D to force suction of waste paper onto the paper making net / G, 8! i
degree 3 / (zr) / 17,6 (am) = 1 near 6 (# r / am ") o force / (-y is molded. After gm, air is sent
from the lower side of the convex portion //, and the cover 3 is forcibly removed from the paper
network l as shown in Fig. 4C. After that, the cover 3 is finished by drying in a drying oven. Using
the cover 3 of the present invention thus formed, the back rMcy yam bar S of the speaker 2 is
provided as described above, and a test is made based thereon. As a result, a conventional iron
plate 1 synthetic resin 1 plywood and When using a cardboard cover, it is possible to prevent
standing wave generation, resonance, and resonance without requiring any sound absorbing
material that is necessary at all, and also reduce the third harmonic distortion component. Also,
with the volume of about 172 of the conventional cover, it was possible to obtain the same lowpass reproduction range as before. The above-described embodiment is an embodiment of the
present invention and internal loss by changing the beating degree of recycled waste paper, the
type of pulp, the blending ratio thereof, and the content plan of waste paper to water bath liquid.
The density, sound, air permeability, etc. may be adjusted, and if it is dense to 4I, the degree does
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not need a sound absorbing material at all by appropriately selecting in the range of 1.5 to 2.5
(gr / am "), Alternatively, standing wave generation, resonance and resonance can be prevented
and the third harmonic distortion can be reduced by using only a small amount of sound
absorbing material as compared with the prior art.
In addition, the inner surface of the cover 3 can be easily formed in a concavo-convex shape, and
by forming the concavo-convex shape in this way, the internal loss can be further increased and
the sound absorbing effect can be enhanced to prevent resonance 1 and resonance. Further, by
appropriately selecting the shapes of the convex part ridges of the jig 14 and the web 17, it is
possible to easily obtain the irregular cover 3 as shown in FIG. By shaping, it is possible to
maintain the strength and to improve the effect of preventing resonance and resonance. Fig. 6
shows another example of the attachment state of the cover 3 of the present invention, and the
inner surface of the flange b of the speaker frame 2 is overlapped with the flange 3a of the cover
3 of the present invention. b is superimposed on the inner surface of the baffle II / via the antivibration rubber / j. Then, both of the seven flanges 2o and 3a are attached to the baffle plate 1
with screws 17 from the inside by interposing the washer 16. Further, FIG. 6B shows still another
example of the attachment state of the cover 3 of the present invention, and the flange 3a of the
cover of the present invention is overlapped on the inside rM of the flange roller of the beaker
frame coa. The inner surface of 7 of the rungs Ja is superimposed on the outer surface of the
baffle plate I. Then, with both washers 16 interposed, these two flanges EndPage: 2 zico t), ja are
attached to the baffle plate l by screws 17 from the outside. By thus mounting the flange 3a of
the cover 3 of the present invention on the 7 runes 1b of the speaker frame core a and attaching
them from the baffle @ / WC screw / 71C, these mounting operations can be performed at one
time. Can be improved. As apparent from the above, the internal loss can be increased by
providing the back chamber using the cover of the present invention obtained by beating the
recycled paper and molding it by the paper making method, and no sound absorbing material is
required at all. Standing waves can be prevented and resonance and resonance can be prevented
with a small amount compared with the prior art, if used, and the third harmonic distortion can
be reduced. In addition, in order to obtain the same low-pass regeneration range as before, the
conventional volume of about 172 is sufficient, which is economical. Also, any shape can be
easily obtained, and the mounting 1 can be easily performed. Furthermore, since recycled waste
paper is used, there is an advantage that it can be provided at low cost.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of a
state in which a back fMvc chamber of a speaker is formed by a conventional cover. Fig. 2 is a
cross-sectional view showing another example of the state in which the chamber is formed on the
back II of the speaker by the conventional cover. Fig. 3 is a #rrN diagram showing an example of
a state in which a chamber is formed on the back 1 m of the speaker by the cover of the present
invention. 4A-C are the covers of the present invention! ｌ！ A cross-sectional view showing an
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example of the 111L sequence, FIGS. 5A and 5B are cross-sectional views showing a modification
of the cover of the present invention, and FIGS. 6A and 6B show other examples of the
attachment state of the cover of the present invention. It is a partially expanded sectional view. l
... baffle plate, co ... speaker, 3 ... cover. Ｓ・・・チャンバー。 Patent Assignee Pai-Oni Co., Ltd.
Attorney Attorney Kobayashi Nobu Fuyu Patent Attorney Murai Susumu EndPage: ３
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