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JPS60227597

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DESCRIPTION JPS60227597
[0001]
The present invention is relatively easy to manufacture electro-acoustic transducers, in particular
novel loudspeaker drivers, which are inexpensive in terms of production cost and material cost,
but also have excellent acoustic characteristics, and are relatively easy to mass-produce by
advanced automation. Although the performance of the drivers can be maintained, the
performance of the drivers can be maintained without loss, and the manufacturing tolerances can
be kept within a narrow range. The object of the present invention is, as described above, that the
material cost and the manufacturing cost of each part are low (, while it is easy to put on the
advanced automation technology, the manufacturing tolerance is considerably small and the
baffle plate of the driver 7 loudspeaker system) Fixing is also simple, economical and maintains
high performance, and the method of attaching it to the basket of a spider coil of voice coil is also
made inexpensive and reliable, and vibration is generated at the connecting portion between the
basket and the front plate. Sound washers and adhesives. Shake the basket against the front
panel without using external means such as a dumping agent! ヲ Removes the gap, further
increases the gap magnetic flux density, substantially uniforms the air load on the diaphragm,
and takes the strength of the flange portion sufficiently to manage the sealing function of the
flutter component between the driver and the baffle. A loudspeaker driver and a method of
manufacturing the same. Further, the other objects of the present invention are as follows. Make
sure that the area of the flange in contact with the baffle is approximately in the same plane, and
then give the gasket a uniform compression force, and align the driver in axial alignment within
the baffled mounting holes. Yt can be stored to prevent damage to the flange and seal leakage,
and the mounting screw should be folded into the baffle plate perpendicularly to the flange main
surface, and give an unexpected pressure to the baffle plate opening edge etc. to cause damage.
Ensure that the through holes of the front pole plate and the through flange of the front pole
plate are properly aligned with the intended passage axis direction, such as not to be raised, the
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spider flange, the roll flange of the cone, the projecting parts or individual parts in each
component Maintaining the relative height or position between the flange and the front pole
plate in a reliable and repeatable manner, maintaining a predetermined position even when the
front pole plate is assembled in the capsule portion, and The plate should be fixed mechanically
with sufficiently high rigidity, and the front pole piece is provided with notches or key grooves in
a part of the periphery of the through hole portion to ensure accurate positioning with respect to
the speaker terminal. Reproducibility, the corn roll part is not provided with a pad ring etc., it
should be held in one direction so as to avoid reverse bending, the size of the speaker relative to
the baffle plate is relatively narrow Within the manufacturing tolerance, with a constant
engagement surface to the baffle plate, the attachment of the connection terminal for cord
connection also discloses a convenient way that does not require insulating strips or auxiliary
fastener means etc. Using a spider (damper) with an overall planar shape that is convenient and
appropriate and has sufficiently high stability at the time of extension and contraction, and the
vent hole and terminal pad portion are formed by two-piece molding etc. In addition to uniform
air loading, stress concentration Z in sharp parts is reduced, and a rod of standard diameter can
be used during molding so as to reduce molding cost as a whole.
The loudspeaker driver of the present invention includes a plastic bass keratlas having a front
(front) pole plate which is made of a magnetic material with low magnetic resistance. Desirably,
the pole plate is stamped and formed so that an undercut is taken at the edge portion to be
advantageous in the case of the above-described pole plate inclusion molding. In addition, the
shape should be octagonal, and it is possible to form a center coil coaxially with an open lower
drill and provide notches radially outward from the opening edge, voice coil, return lead wire
from coil rear end, cylindrical magnetic pole body (B) C-pieces) should be suitable to accept. The
cylindrical pole body may be press fit or press fit within a coaxial opening preferably opened in
the back pole plate of low magnetoresistive magnetic material, the back pole plate also
preferably being octagonal, and the front pole Together with the plate, the annular permanent
magnets are closely packed so as to obtain a high level of magnetic flux between the air gap
between the opening of the front pole plate and the pole piece. The plastic basket is preferably
provided with an annular flat surface in front of the front pole plate, in which a voice coil spider
(generally preferably flat) is fixed. A desirable fixing method is to set the spider to have a porous
material periphery, apply heat to the annular flat portion from the periphery to melt the surface
portion, and allow the melted plastic material to flow into the spider peripheral pore portion, and
then The heat is removed and cooled, and the plastic material Z is solidified. The plastic basket is
also preferably provided with a pair of tabs radially outward of the face section, with openings 7
leading to the tabs and the tabs being spaced apart from one another to provide electrical
insulation while supporting the terminal machine mechanically. This terminal can be connected
to the voice coil lead through the above-mentioned opening. It is also desirable that the radially
extending, forwardly extending surface of the other annular surface (parallel to the front pole
plate) supporting the edge (peripheral edge) of the diaphragm (cone) from the fixed annular
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2
surface of the spider be substantially extended. A plurality of uniformly arranged vent holes are
made to make the air load of the diaphragm uniform. Desirably, each of the openings has an
elliptical shape, and the distance between adjacent openings is shorter than the minor axis
diameter of the elliptical opening. The two openings facing the tab that receive the speaker
terminal are preferably larger than the other openings and may be a circular punch or punch Z
that can be received at the rear end rather than a punch or punch. It is formed into an elliptical
shape by a tool.
The speaker terminal tab has an opening for receiving the speaker terminal tab. It is preferable
that the rim is vertically raised from the surface of the diaphragm that supports the edge Z and
that the rim of the flange is protected. The upper end surface of the rim portion may be a flat
mounting surface parallel to the pole plate. Three mounting tags may be provided at angularly
equal intervals to enhance the stability of the installation. These tabs have openings for receiving
screws and screwing into the baffle at this opening? Guides to keep vertical may be used. Also,
the rim portion may be a plurality of parts extending between adjacent mounting tabs, so that a
so-called twist-end-lock system may be adopted, in which the attachment to the baffle is inserted
and then twisted and fixed. Desirably, the outer peripheral surface of the basket may be extended
at each radius to provide a rib 7 extending toward the mounting tab, to help centering and
centering when it is accommodated in the mounting hole of the gutter. Also, a plurality of stators
may be provided in parallel with the front pole plate and with the upper surface positioned
between the annular flat portions to which the edges of the spider and the diaphragm are
respectively fixed so that the drivers can be overlapped in series. good. In the manufacturing
method, the front pole plate Z basket is first positioned at the rear of the mold for molding, and a
plastic material is poured into this mold to be embedded in the mold integrally with the plastic
material when Y molding is performed. Preferably, the front pole plate is stamped and formed,
and the clearance of the punched die generally punches out the metal (sometimes provided with
an undercut that occurs and is inclined radially inward as it is in the mold and aft) It is preferable
that the plastic material flow to the rear of the front end portion of the pole plate so as to
strengthen the fixing force when the pole plate is fixed in that position after cooling. The
periphery of the voice coil spider (preferably the flat surface as a whole) is located on the first
annular flat portion described above, heat is applied to the surface through the peripheral edge,
and the plastic of that portion is It is preferable to melt and flow the plastic into the peripheral
porous portion of the spider in the direction of the heat source, and then removing the heat
source causes the plastic to re-harden and provide a firm fit between the spider peripheral and
the surface. Due to the accuracy of the assembly after molding, and thus the positional accuracy
of the notches in the pole plate, preferably the single-layer helical voice coil previously
assembled in the mashydrel has seven turns in which the winding portion passes over the
winding portion It can be inserted precisely through the spider by passing it through the mouth.
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3
The presence of indents is a single-layer helical voice coil which can be used in the absence of
flux loss in a coil having a folded-over IJ-) portion 7 as described above. Magnetic flux losses
occur because the holes must be uniformly increased. After being inserted into the assembly
mandrel, after inserting the coil, an adhesive such as alpha-cyanoacrylate is attached to the
annular flat portion supporting the edge of the diaphragm. This adhesive is effective for fixing
the corn roll portion Z of urethane and its microporous material. The fact that the surface is
essentially flat can contribute to the uniform curing properties within 2 seconds of the adhesive.
After curing of the bond, the mandrel can be removed and the entire device can be completed
with the help of techniques that would normally occur to those skilled in the art. In the case of
using a fabric-made corn roll, for example, the fixing technique as described above for spider
fixing may be used. Other objects and features of the present invention will become apparent as
the description of the illustrated embodiment proceeds. FIG. 1 shows an embodiment of an
electro-acoustic transducer or a driver of loud-speech force according to the present invention in
an exploded perspective view first, but a plastic basket 11 having a large rectangular shape of
magnetic material with low magnetic resistivity. A front (forward) pole plate 12 is embedded. The
basket is also provided with a plastic tab 13 for mounting a speaker terminal 14 which connects
to the voice coil winding 18 as clearly shown in FIG. An opening is open at the center of the same
(low reluctance, rear (rear)) entry angle pole plate 16, and the pole piece 17 is press-fit and fixed
therein. The pole piece 17 is located within the central opening 22 of the annular permanent
magnet 21 having high magnetic energy and is surrounded by the magnet. As shown in FIG.
2.5.degree., The outer peripheral side of the plastic basket 11 has three ribs 23 extending
radially outward, as clearly shown in FIG. It also serves as a sealing means for positioning the
central axis of the screwdriver when it is inserted inside. Also, in the middle portion between the
spider (Dan ') 25 and the annular outer edge mounting lip 26 of the cone 27 on the outer
periphery of the basket 11, a plurality of vent holes 24 having a substantially oval shape along
the periphery are continuous and continuous. It is opened. The voice coil bobbin 31 carries the
voice coil 32 (FIG. 2) and is fixed to the cone 27 and the spider 25 as clearly shown in FIG.
As shown in the second illustration, a dust cover (a dust is a plate) 33 covers the tip end opening
of the bobbin 31. The voice coil 32 is preferably a special surface-treated (without an insulation
coating process; anodised; anodized) aluminum wire wound preferably with a rectangular cross
section, preferably a bobbin of 31 aluminum, preferably anodised aluminum. A 31AY drill is good
(made in the axial direction), the back winding end 15A of the coil extends forward in parallel
with the key groove 54 'across the wound portion of the coil. In this way, it is possible to
minimize the air gap distance, to eliminate the waste of the void volume magnetic flux, to
maximize the flux utilization rate and hence the driver efficiency, and to be suitable for the
conductive material. Because a thin oxide film is applied as a thin insulating material, many
windings can be wound tightly in the air gap, and relatively low inertia 7 (inertia) can be
achieved, resulting in high efficiency. I can guide you. Furthermore, in practice, as in the case of
the Bose 901 loudspeaker disclosed in US Pat. No. 3,582,553 and commercialized, nine drivers
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are connected in series. Also, since it is easy to hold one low impedance, for example, to about 09
Ω by winding one layer, it is possible to obtain a nominal in-dance of 8 Ω in series (usually a
speaker with this in-dance value is generally used) in series. . −! Also, the bobbin 31 can be
easily formed by winding an aluminum sheet roller on a mandrel. FIG. 2 is a cross-sectional view
along the diameter of the first illustrated embodiment, with the terminal 14 attached. The same
reference numerals denote the same components throughout FIG. As mentioned above, the air
gap in which the voice coil 32 is housed is the air gap between the pole piece 17 and the front
pole plate 12 so that the inner surface of the bobbin 31 does not touch the pole piece 17 Also,
the voice coil 32 is in such a positional relationship that it does not touch the radially inner
peripheral surface of the front pole plate. The plastic basket 11 is formed with an annular flat
portion 34 which is parallel to the plate 12 above the front pole plate 12 and the peripheral edge
35 of the spider 25 is fixed thereto. The fixing method is preferably performed by applying heat
just below the melting temperature to the annular flat surface portion 34 through the peripheral
edge 35 and pouring it into the pores of the porous or foamed material which is the material of
the peripheral edge 35. That's good. Thereafter, the heat is removed, and the plastic material
solidifies in that state, so that the sleeve 25 is held exactly parallel to the front pole plate 12 and
exactly perpendicular to the central axis of the driver. It can be fixed to
The plastic basket IIK has this annular flat portion 34 and another annular flat portion 36
parallel to the pole plate 12, but here the peripheral edge (commonly called edge) 26 of the cone
27 applies heat as described above to the adhesive. The plastic material under the edge is melted
and then fixed by a suitable method such as fixing by removing heat. The lip 37 rises vertically
from the annular surface portion 36, but the upper end surface 42 is parallel to the surface
portion 36, the annular flat portion 34, and the front pole plate 12 to be an annular surface
engaged with the baffle plate And the roll portion 41 of the edge of the high mackerel 27 of the
lip is sufficiently high to protect. As described below with reference to FIG. 9, this lip 37 can also
be provided with a sealing function. Just below the annular surface portion 36, the annular
surface portion 43 is parallel to the surface portion 36, the annular flat surface portion 34, the
upper end surface 42, and the front pole plate 2], and also serves as a holding portion to the
baffle plate. The face portion 43 is engaged to contribute to the accurate positioning of the driver
and to provide a sealing action in balance with a commonly used gasket. Although only one is
shown in FIG. 2, there are preferably three equally angularly arranged through holes 44, each for
a fixed screw. The through hole should be designed so that its axis is perpendicular to the plane
of the baffle and that there is no gap as close as possible to the fixing screw as far as possible (so
that the fixing screw is exactly baffled. Since it will be folded vertically, it will be broken or it will
enter into a slant and protrude from the through hole part. The basket 11 is also provided with
three ribs 23 extending radially outward toward a flat portion including the installation throughhole 44 so as to align with the central axis when stored dry / thin in the baffle. It is designed to
help (centering). FIG. 3 shows the connection between the bobbin 31 and the cone 27 and the
spider 25. That is, it is made of an adhesive medium 45 such as a thermosetting adhesive such as
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an epoxy resin. As clearly shown in the plan view of FIG. 4, 26 elliptical openings (rounded by
projection) 24 are drilled in the basket and the speaker terminal is slotted in the case of the
circularly arranged series shown in the drawing. At the part facing the tab J3 held in 52, two
thick oval openings 51 are pierced. The minor axis diameter of the elliptical opening is the same
as that of FIG. 4 (the diameter of the circular opening that appears circular when projected onto a
plane. The angle between the radii passing through the centerline of the opening 51 of the
basket 11 is 25 ° in the illustrated case, so that each centerline of the opening 51 is angled by
12 · 0 ° and the centerline of the opening 24 is Adjacent angular spacing is 12 °.
It is preferable that the minor axis diameter fd of the opening 24 is about 6.4 mm (% inch) and
the distance between adjacent opening edges is shorter than that. Anyway, good and uniform
breathability is obtained in this way. Where the arrangement between the openings deviates
from the uniform and symmetrical relationship as described above, the opening facing the
speaker terminal tab 13 is larger, but this can be formed into a tab in the usual forming process.
In order to As mentioned above, if the number of openings as vents and the interval are set, the
radial flow of the material is not restricted at the time of molding, and the number of ribs, the
narrowness of the width, etc. are uniform air permeability Also, uniform material flow can be
ensured and uniform strength can be obtained regardless of the rotational position after
installation. Such a symmetrical arrangement does not have to affect the function as a
loudspeaker, as it produces firmness, concentric contraction Y of radial contraction after
molding, and radial contraction. The plastic basket 11 also has five angularly equally spaced
steps 53, the upper plane of which is a plane parallel to the front pole plate 16, the annular plane
34. 36 and an annular plane. In a plane located between parts 34.36. The stepped portion 53 is
useful for stacking the bass keratlas at the time of carrying or stacking before being assembled
as a speaker. The radial notches 54 'drilled in the front pole plate 16 are at an angular position
approximately 30 ° from the bisector radius of both tabs 13 and provide an accurate reference
guide during speaker assembly. Work as a means to In the plastic basket 11, the portion carrying
the installation opening 44 is an equiangular position of the tabs 54 (three in the illustrated
case), and in the circumferential direction between the uprights 37 and the adjacent tabs. The
rims are each provided with a projection 55 which engages with a groove in the complementary
rim portion of the bubble as will be described later to allow so-called snap-in insertion of the
driver. The opening 44 may not be particularly necessary in such a fastening procedure. On the
other hand, the assembled driver may be fixed in the radial direction by screwing it into an
ordinary baffle by means of screws or other suitable fixing means 44 (in the case shown, it
becomes a three-point support) Stability is high), in which case it is usual for the annular plane
43 to lie flush with the bubble surface, ie on the surface. FIG. 4 is a cross-sectional view taken
along the line 5-5 of FIG. 5. In the above description, the vertical positional relationship of some
of the components will be clearer.
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FIG. 6 is also for reference, and is a side view seen from the side of the line in FIG. FIG. 7 is a plan
view of the above-mentioned regular octagonal front pole plate 12, the material of which is a
low-magnetic-resistance magnetic material, for example, a hot-rolled pickled oil magnet
corresponding to the model of C71010 to C-1018. It is shown that steel etc. is good (in the
figure, the notch 54 'is worn. FIG. 8 is a cross-sectional view of the front pole plate 12 taken
along the line 8-8 of FIG. 7 and is clearly shown between the middle and along the
circumferential surface 56 going backward, Q .. It will be understood that it is taken. When the
undercut is taken in this way, the flow of the plastic during molding (and effectively acting to
firmly fix the octagonal front pole plate in the plastic basket 11 in an embedded manner). The
flick plate 16 is also similar to the front pole plate, but differs in that the diameter of the central
opening thereof is slightly smaller in order to press-fit the pole piece 17 and that the key groove
or the notch is not provided. . The use of double pole plates 12.16 '& octagons usually results in
material savings in manufacture over the use of round pole plates which result in octagonal
circumscribed circles. Considering that the pole plate area is equal, in the octagonal pole plate,
the distance between the opposite sides is smaller than the diameter of the circular pole plate
having the same effective area 7, but even if it is, the magnetic circuit From the point of view, it
has been found that an entry angle pole plate is sufficiently satisfactory. FIG. 9 shows the portion
7 of the baffle suitable for installing the driver of the embodiment described above, and the baffle
may also be made of plastic. An opening 62 is opened in the baffle plate 61, and the peripheral
edge thereof is an annular surface 63 which is one step lower, and the surface 43 in FIG. 2 is in
close contact with this surface 63 when the driver 11 is accommodated in the opening. Contact.
It is desirable that the diameter of the opening 62 be exactly the same size to accommodate the
portion below the surface 43 of the nomiscote 11. There are three groove structures 64 spaced
at equal angular intervals, open at the counterclockwise facing edge, adapted to receive the tabs
54 and provided with notches 65 It is adapted to engage with the projection 55 of the basket 11.
The height of the slit in the groove structure 64 is preferably slightly less than the thickness of
the tab 54, so that when the loudspeaker is turned clockwise to bring the protuberance 55 into
engagement with the notch 65, the tab 54 While firmly assembled, the outer peripheral surface
of the lip portion 37 'closely engages the wall surface 66 which is perpendicular to the baffle 61.
Even without using gaskets, soft materials such as moltite or screws, etc., they can be sealingly
fixed to the driver, resulting in cost reduction and reliability. If necessary, screws or other
fasteners Z may be inserted through the openings 44. In one embodiment, the driver according
to the present invention embodied in the Bose 901 Louds 9-speaker system of the present
applicant has a diameter of about H, 4cIrL (4 ·% inch), Based on this, the dimensions, materials,
etc. of each part are described in the reference note. The material of the plastic basket is obtained
by mixing 20 to 30 glass fibers in thermoplastic polyester such as Valox (GE). Outer diameter of
annular flat portion 36: about 11.18 inches (4, 4 inches) same inner diameter: height of rim 37
on annular flat portion 36 of about 10.6 cm (3, 96 inches): about 0.64 cm Thickness of (0, 25
inches) annular flat portion 36: distance between about 0.19 c IrL (0,075 inches) faces 36. 34:
11-05-2019
7
outer diameter of about 1.80 crf L (0, 712 inches) annular flat portion 34: About 7.79 C7 rL (3,0
inches) Same diameter: about 7.0 IC IrL (2, 76 inches) distance between the same surface 34 and
the pole plate 12: Outer diameter just under about 0.69 CIn (0,2 inches) 36 : Outside diameter in
a plane including about 10.28 cm (4,05 inch) pole plate 12: Thickness of about 8.61 cm (3, 39
inch) pole plate 12: about 0.45 crrL (0, 18 inch) Distance between sides: about 7.62cIr (3 inches)
the central open diameter: about 2.76 crn (1,088 inches) preferred assembly sequence is as
follows embodiments described above. 1 Back play H6, y + -j'-le-piece 17, assembled using
permanent magnet 21 乞 anaerobic adhesive. 2 Insert terminal 14 into tab 13. 3, with spider
positioning and mounting. 4 Insert voice coil assembly with 32 voice coils. 5 Attach an adhesive
to the root side and the roll edge mounting side of the cone. 6 Corn roll collar) 26 kWJ Vt'iS 36
VC fixed. 7 Riet "wire removal, dust cap fixing, soldering" should be attached to work and
magnetic function. The need to create a new and effective loudspeaker driver is quite powerful,
as detailed above.
[0002]
Brief description of the drawings
[0003]
1 is an exploded perspective view of one embodiment of the loudspeaker according to the
present invention, FIG. 2 is a longitudinal sectional view of the same embodiment, and FIG. 3 is a
partially enlarged sectional view of the main parts in FIG. Is a plan view of the plastic basket in
the same embodiment, FIG. 5 is a cross-sectional view taken along the line of FIG. 4-5, FIG. 6 is a
side view of the basket seen in the direction of FIG. The figure is a plan view of the front pole ear
in the embodiment, FIG. 8 is a sectional view taken along the line 7-8 in FIG. 7, and FIG. 9 is a
part of a baffle suitable for assembling the loudspeaker of the embodiment. It is a plan view.
In the figure, 11 is a plastic basket, 2 is a front pole plate, 16 is a rear to back pole plate, 17 is a
pole piece, 21 is a permanent magnet, 24 is a vent, 25 is a spider, 32 is a voice coil, 34, 36 Are
annular flats, 37 are rims, 54 are tabs, 61 are baffles.
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