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JPS57148497

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DESCRIPTION JPS57148497
DESCRIPTION OF THE PREFERRED EMBODIMENTS Tungierin Distributed Drive Transducer 1) A
magnet plate having a horizontal main magnetic field which is equally divided into even parts
and which is equally divided radially and a petal-shaped pattern conductor having a similar
shape to the distribution of the main magnetic field And a spread diaphragm having an insulating
thin film surface formed thereon.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a transducer as an
electro-acoustic transducer, and more particularly to a dispersive drive transducer for driving a
diaphragm entirely. There are two types of transducers: distributed drive type and concentrated
drive type. With the distributed drive type, the concentrated drive type excites and drives the
diaphragm locally, while almost the entire surface of the diaphragm (= drive). Distributes the
force to accelerate the diaphragm · As its characteristic, it is possible to vibrate the thin film
diaphragm of soft and light weight over a wide band with high fidelity, so that generally excellent
sound quality can be obtained Also σ) EndPage: 1. As a typical dispersion drive type transducer,
there has been a capacitor type since a long time ago, but recently, a multi-pole type movable
ribbon type electroacoustic transducer (Japanese Patent Publication No. 35-10420) has been
honored for its simplicity. The performance that surpasses the capacitor type has already been
obtained. However, since this type of transducer has a short history, there are many points to be
improved in its structure. For example, in terms of conversion efficiency, although it is
considerably inferior to the concentrated drive type of the moving diaphragm with a moving coil,
its cause is that it is effective to be located outside the magnetic field or in the vertical magnetic
field of the ribbon conductor. Not only does the part or part that does not generate a force cause
conversion loss, but it also increases the second and third harmonic distortion incidentally. Next,
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these two points will be described with respect to two known embodiments. The transducer
shown in FIG. 1 is known as a parallel pole type, but the ribbon conductor of the film surface
constituting the diaphragm first passes through the side portion 2.3 etc. from the input end 1
through the parallel part. After that, the turnaround point 4 is reached, and it passes through the
detour 5 back to the first input end l, and this is repeated several times to reach the output end 6.
This forms a pattern conductor having a required conductor length. In this case, although the
portions of the bypass 2.3 and the bypass 5 are conductors outside the magnetic field and
generating no excitation force, they are considered to reach about 26% of the total length, and
the direct loss thereof Is about 2.7 dB. However, since a 220 Ω series resistor is conventionally
inserted into the headphone jack terminal of the stereo amplifier, the effective loss is
approximately 2. It is about Q dB. Moreover, when this diaphragm is viewed as a full drive type,
aluminum ribbon conductors are arranged in parallel rows, and the rigidity distribution on the
film surface is a dog with remarkable longitudinal asymmetry, so dissonant parasitic vibration is
likely to occur 1 . Harmonic distortion is noticeable in the mid-tone band.
Next, the transducer of FIG. 2 is of the ring magnetic pole type, but the magnet same root 7
forming the magnetic field delimits a plurality of concentric boundary lines 8a 18 b 18 c shown
by the chain line and sequentially S and N at both sides. The vibrating plate corresponding to this
has a spiral pattern in which the winding direction of the annular spiral conductor 9 is reversed
to the left and right for each boundary line. In this method, although there is no ribbon conductor
outside the magnetic field, it is considered that about 25% of the total of the reactive component
in the perpendicular magnetic field is included, and the direct loss is about 2.5 dE. The reactive
component in this case is also an annular band accompanied by lateral vibration in the surface
direction, which promotes split vibration in the midrange and is a major cause of harmonic
distortion. (In FIG. 1, the illustration of the acoustic aperture is omitted. 2.) The transducer of the
present invention improves on the magnetic field as well as the pattern of the ribbon conductor
in order to eliminate the above-mentioned drawbacks and the TANGERINE type (TANGERINE). An
arrangement of radiation types that can be used when round orange etc. is adopted, eliminating
ineffective conductors as much as possible, improving conversion efficiency, and making the
driving force acting on the film surface correspond to the mechanical impedance of the action
point The expansion of the piston band and the reduction of the harmonic distortion are made to
work. FIG. 3 and the following show a basic embodiment of a Tandem phosphorus type
dispersion-driven transducer according to the present invention. The number of magnetic poles
in the drawing is drawn less than practical for the sake of clarity. FIG. 3 is a plan view of the
magnet plate lO, FIG. 4 is a plan view of the diaphragm 17, and FIG. 5 is an assembled crosssectional view of the present transducer. The magnet plate 10 of FIG. 3 is arranged at equal
intervals on the surface of one perforated circular yoke iron plate 11 with magnet pieces 12 of
an isosceles triangle intervened by an even number (12 in the figure) of radial gaps 13. In the
yoke iron plate 11 that forms the bottom of each gap, a large number of acoustic apertures 14
and one large aperture 15 are opened at the center. The magnet piece 12 is firmly bonded to the
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yoke iron plate 11 with an epoxy resin or the like, subjected to grinding, and finished with a flat
surface C2. As the magnet piece, an anisotropic ferrite sintered magnet with high coercivity and
low demagnetization is acceptable with low cost, light weight and good L-polarity EndPage: 2,
and in the final step, the inner part is alternated sequentially to the NXS pole It is magnetized in
the thickness direction to form a radial main magnetic field. Further, the outer peripheral portion
of each magnet piece 12 divides and magnetizes a boundary line 16 indicated by a dotted line to
form a peripheral magnetic field having the opposite polarity to the main magnetic field. The
yoke iron plate 11 converges the magnetic flux on the back surface of the magnet piece 12 and
serves to strengthen the surface magnetic flux as a closed magnetic path, but increasing the
aperture 14 to facilitate the derivation of the acoustic output reverses the magnetic resistance
increase. In the present Tangierin-type transducer, the large hole 15 is opened at the central
portion irrelevant to the effect to compensate for the lack of the opening.
Thus, the total magnetic flux of the surface of one magnet plate 10 is about IO'Maxwells, and the
magnetic field straddling the gap between each magnet piece 12 is around 1.2 KGauss left at the
maximum magnetic flux density. Moreover, since the magnet pieces 12 of the magnetic flux plate
10 are triangular, the magnetic flux distribution in the radial direction has the largest outer
periphery corresponding to the shape of the magnet and the smallest value in the vicinity of the
large aperture 15. It is convenient as described later with regard to the force. The magnet plate
lO can be used as a single plate, but usually, as schematically shown in the sectional view C of
FIG. 5, two magnet plates are used, and the same electrodes are opposed to each other to form a
diaphragm with a sand-inch shape. When it is collected, the surface magnetic flux diffused in an
arc shape receives repulsive magnetic force and is inserted into the narrow gap C2 and flattened
C2 as a result of which the distribution area of the horizontal magnetic field is expanded and the
amount of magnetic flux is doubled. It is very effective. Next, a diaphragm 17 corresponding to
the magnet plate 10 is shown in FIG. This is formed by forming a petal-shaped pattern conductor
20 similar in shape to the horizontal magnetic field distribution of the magnet plate 10 with the
insulating thin film 18 as a base film and a double-sided or single-sided surface C2, Flattened on
the spread ring 19 (two spread. The ribbon conductor is a narrow a / reumium ribbon of about
0.2 tgm, with a gap of 01 working position, starting from the beginning 21 of the surface,
turning clockwise about 10 to 13 times and then reaching the end 22 . Similarly, there is a
different isomorphic pattern conductor which is difficult to be shown by a dotted line on the back
side, and it turns leftward along the outside from the start end 22a and ends at the end 23. The
end 22 and the start 22a are connected through the base film to connect the front and back /
<turn conductors in series. In the petal-shaped batanin in FIG. 4, the radial portion of the
conductor is inclined at an offset angle of about 1σ to 15 ° with respect to the true radius so
that the connection of the pattern conductor at the turnaround point near the center becomes
smooth. There is. However, if the offset angle is excessive, the conductor intrudes into the
perpendicular magnetic field, which is not preferable. This offset angle is set as small as possible.
When a signal is applied to the start 21 and the end 23 of the pattern conductor described
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above, the signal current flows in the same direction to all the conductors in the radial direction,
but in the peripheral part 24.25, it is reversed between adjacents. It has become. Therefore, when
the diaphragm 7 having such a pattern conductor is combined with the magnet plate 10, an
exciting force in the same direction is generated in all the conductors to accelerate the thin film
18 with substantially the same phase. It can be excited. As described above, the diaphragm 17 is
formed with a delicate and complicated pattern of conductors, but the production method is
relatively simple, and it is possible to supply a large amount at low cost.
That is, a high purity metal aluminum foil having a thickness of about 10/1 is laminated on both
sides or one side of a Kapton film (K, apton, trade name of DuPont, USA) or a biaxially stretched
polyester film having a thickness of 10 μm or less By making a film and subjecting it to a wellknown resist and a series of photochemical etching processes, a pattern conductor with high
precision can be continuously manufactured, and this thin film is uniformly stretched on the
tension ring 19 Thus, the diaphragm 17 of FIG. 4 can be completed. The above magnet plate lO
and diaphragm plate 7 are combined to form a single transducer ((2), as shown in FIG. 35, a gap
of about 03 mm is interposed between the vibration & film surface as shown in FIG. 35) Then,
the conductor pattern and the magnetic field distribution are matched, the diaphragm 17 is
sandwiched between the two magnetic plates, and the peripheral portion is tightened to one
body by the fixing screw 26 to complete the assembly. Reference numerals 26M and 26b denote
screw holes provided in the magnet plate io and the vibration & 17. When a signal current is
made to flow between the terminals 2 and 23 of this transducer, almost all the conductors on the
surface of the thin film 18 cross the horizontal magnetic field of the magnet plate 10 to induce
an in-phase excitation in each part. As a result of exciting and accelerating the film surface, an
acoustic output can be derived from the aperture 14.15 and used outside. As an example of a
diaphragm having a petal-shaped pattern conductor shown in FIG. 4, a ribbon conductor of I11
× 0.2 in a pattern of about 4.0 mm in width is used, using an aluminum foil of 12 μm in
thickness. A petal-shaped pattern conductor is formed by arranging 13 pieces with a gap of 0.1
mm interposed. In this case, the conductor length on one side is about 3.5 m, and the conductor
resistance per unit length is 23.12 "/, and the conductor resistance is about 800, and is about
1600 in both-side series. When this was tested with an IEO-31'8 international standard cover (as
a 2,5 cc artificial ear) as a unit for stereo headphones, the following performance was roughly
shown. Conversion sensitivity, 987 mw (IKH2) reproduction band: within ± 5 dB in the range of
20 Hz to 20 KHz second or third harmonic distortion ratio = 002% or less (iooa B. IKH2) The
advantages of the tanjeelin dispersion-driven transducer of the present invention can be
summarized as follows. (1) The pattern conductor on the surface of the thin film 18 has a small
amount of reactive component, and almost all the conductors act with the horizontal magnetic
field to generate an effective excitation force, contributing to the improvement of the sensitivity.
The disadvantages of poor sensitivity are improved. (2) The aperture density of the acoustic
apertures of the yoke iron plate 11 increases from the outer periphery toward the center, and the
central large aperture 15 can further reduce the acoustic impedance of the central portion.
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This corresponds to the vibration mode inherent to the expansion diaphragm in which the
amplitude at the central portion is maximum and the sound pressure is maximum at the
expansion diaphragm. Therefore, adverse effects such as sensitivity deterioration of high-pitched
region and lack of tonality characteristics due to lack of the aperture area can be avoided, and
flat characteristics can be easily obtained. (3) Conceptually speaking, the mechanical impedance
of the stretched diaphragm is maximum at the outer peripheral portion and minimum at the
central portion. The excitation force F of the conductor is proportional to the horizontal magnetic
flux density 、, and the horizontal magnetic flux density is proportional to the radial area ratio of
the triangular magnet piece. Therefore, in the Tangerine equation, F at the outer periphery is the
largest, and the central part is the smallest. This means that the excitation force F generated in
each part of the film surface corresponds to the mechanical impedance of each action point on
the film surface, and is a desirable condition when the soft, low rigidity film surface is uniformly
pistoned I am satisfied. As described above, in the tangerine transducer according to the present
invention, the piston interlocking zone of the vibrating membrane can be expanded, and the
generation of high-order harmonic distortion can be suppressed. Therefore, improvement of the
reproduction sound quality can be expected. In the embodiment of FIGS. 3 and 4, although the
drawing is simplified to draw 12 poles, in practical use, the number of poles is 6 or more, and the
required conductor resistance is satisfied with the pattern conductor. If it is done, it is sufficient
not to use both sides but one side. In this case, as shown in FIG. 6, the magnet plate 10a mounts
two types of long and short magnet pieces 12.12a on the yoke iron & 11 to reduce the weight of
the magnet plate. Furthermore, in FIG. 3, the outer periphery of the magnet piece is divided and
magnetized to form a peripheral magnetic field. As shown in FIG. 7, an annular magnet 27 is
disposed on the outer periphery of the magnet piece 12 It is possible to substitute the magnet &
In'bl 2 in which the sections facing the magnet piece are magnetized in different poles, thereby
strengthening the magnetic flux and expecting an improvement in sensitivity. [2] The magnet
plate is relatively expensive, but to make it inexpensive, EndPage: 4 as shown in FIG. 8 opens the
acoustic apertures 29 and 30 in the circular ferrite magnet plate 28 and centers it. Radial border
31 past the point and circumferential border around the perimeter! By separately dividing and
magnetizing each of 32 and 32, it is possible to reduce the cost by substituting the magnet plate
10c in which the radial main magnetic field and the circular peripheral magnetic field are formed
on a single disk. .
4. Brief description of the drawings Fig. 1 is a schematic explanatory view of a conventional
parallel pole type transducer, Fig. 2 is a schematic explanatory view of a conventional annular
transducer, and Fig. 3 and the following are tanjeelin types of the present invention. 3 shows a
plan view of a pole plate, FIG. 4 shows a plan view of a diaphragm having a pattern conductor
corresponding to the pole plate, FIG. 5 shows a longitudinal sectional view of the transducer, and
FIG. Is a plan view of a magnet plate applied to a diaphragm having a pattern conductor on one
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side, FIG. 7 is a plan view of a magnet plate forming a peripheral magnetic field by an annular
magnet, and FIG. 8 is an inexpensive magnet plate by a perforated ferrite magnet plate FIG. ■ ==
input end, 2.3: bypass, 4: return point, 5: detour, 6: output end, 7: magnet plate, 8: boundary line,
9: conductor, 11010a, xob: magnet plate, 11 : Yoke iron plate, 12.12a: magnet piece, 13: gap, 14:
aperture, 15: large aperture, 16: boundary line, 17: diaphragm, 18: insulating thin film, 19:
tension ring, 20: petal-shaped pattern Conductor, 21.22a: beginning end, 22.23: end, 24.25:
peripheral portion, 26: fixing screw, 26a, 26b: screw hole, 27: annular magnet piece, 28:
Ferrerite magnet plate, 29. 30: acoustic Opening, 31.32: Boundary line. Figure 6 F? Fig. 7 2q3 (:)
EndPage: 5
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