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Description 1, title of the invention
Ribbon type electroacoustic transducer
3. Detailed Description of the Invention It relates to a ribbon type spirit dictionary converter, ie a
speaker and a microphone. The electro-acoustic transducer of the present invention is
consequential (in the ribbon type C, but its conception process is, in principle, an improvement of
the electro-acoustic transducer having a known folding diaphragm. Can. FIG. 1 shows the
principle of operation of a speaker having a known folded diaphragm, wherein l is a diaphragm
made of a thin plastic film, provided with aluminum foil conductors 2 on both the front and back
sides. EndPage: There are two. The conductor 2 is printed in a meandering manner on the
surface of the moving plate l, and the diaphragm l is bent in the direction along the conductor 2
to form an accordion. Thus, when a signal current is applied to the conductor 2, it flows in a
direction perpendicular to the plane of the drawing, and the direction is reversed for each
passage. The diaphragm 1 configured as described above is a magnet of a permanent magnet. It
is disposed between the fuel N and the fuel S. Due to the action of the signal current and the
magnetic field flowing through the conductor 2, an oscillating force in a direction perpendicular
to both the conductor 2 and the magnetic field is generated in each part of the diaphragm l.
When the direction of the excitation force at a certain moment is shown, it becomes like a lateral
arrow. Therefore, the cavity 3 formed above the diaphragm 1 acts to reduce its volume, and the
positive ratio P is obtained. Produces In addition, a cavity 3 'formed below the diaphragm 1
generates a negative pressure -Po. These sound pressures are radiated to the outside as bipolar
sound pressure Po via the through holes provided in the magnetic poles N and S. By the way, the
speaker has the following disadvantages. Since the first missing Qid% magnetic pole interval W
can not be narrowed, a large permanent magnet is required, and the second drawback is that the
input impedance is extreme ((small. The reason why the first defect occurs is that the U-shaped
bent portions 4 that do not contribute to the generation of the excitation between the magnetic
poles exist above and below the conductor 2, and the reason that the second defect arises is that
the conductor This is because the length of 2 is restricted. An object of the present invention is to
eliminate the above-mentioned drawbacks, and will be described in detail with reference to an
eleventh embodiment shown in FIG. That is, 5 is a root-like permanent magnet magnetized in the
thickness direction and has a large number of holes 24. The holes 24 are vertically aligned, and
at a distance slightly larger than the diameter of the holes 24 in the horizontal direction as
illustrated (although they are aligned, they may be arranged in a staggered manner in the
horizontal direction) . This permanent magnet 5 is insane.
It is inserted in and fixed to the corner window of the rim 6. Along the upper and lower window
edges of the frame 6, semi-cylindrical short insulating support columns 7, 7, 8.9 are implanted
with their curved surfaces outside. The upper columns 7 are aligned with the holes 24 and the
lower columns 7 ?, 8, 9 are arranged at a position out of the row of holes 24 (row between
holes 24 and 24) It is done. Each of the columns 7. The vibrating ribbon 10 is hung on the bar at
an appropriate tension, and both ends thereof are fixed to the columns 8 and 9. Accordingly, the
vibrating ribbon 10 is U-turned at the position of each support 7.7: M, and is stretched in a
serpentine manner with portions arranged in parallel around the hole 24. A narrow gap of about
0.05 to 0.1 tone is provided between the edge of the vibrating ribbon lO and the pole face of the
permanent magnet 5 so that the two do not contact with each other. The vibrating ribbon 10 is
made of an insulating plastic film, for example, polyethylene, polyester, a film of about 12 ?m in
thickness made of ethylene fluoride resin as a base 13, and as shown in FIG. An aluminum foil is
pasted into a ribbon having a width of 3 to 4 WrIn, and a photochemical etching process is
applied to the insulating groove 14 at the center in the width direction. The ti 5 is formed, and
four conductors 16 to 19 are formed. Then, in order to give stretchability in the longitudinal
direction of the vibrating ribbon IOK and give rigidity in the width direction, the wave in the
width direction is embossed. From the vibrating ribbon 100 fixed at both ends of the columns 8
and 9K, the eight lead wires 40.41 connected by the conductors 16 to 19 are drawn out and
connected to the terminal plates 11.12 attached to the frame 6. Then, as shown in FIG. 5 (C, as
shown in C, the conductor plates 16 to 19 are connected in series in the same direction by
connecting the terminal plates 11 and 12 with the jumper wire 20, and lead wires 21 connected
to both ends thereof. .22 is a signal input terminal. Thus, the total length of the conductor
reaches 2.5 m or more, and its impedance is about 6 ?. As described above, a pressing pad 27.
The U-turn portion of the oscillating rib / io suspended in a meandering shape, that is, the
portion hung on the support 7.59. Press with 28. This prevents the movement of the vibrating
ribbon IO EndPage: for 3 and 1. The gaps formed between the columns 7 or 7 and 8.9 are closed,
and those portions are provided to prevent f: leakage of sound pressure. This blocking may be
performed by filling with a doping agent such as silicone comb.
In the following manner, the two knits assembled in the shape shown in FIG. 2 are
accommodated and fixed in the case constituted by the disc-shaped yoke 23 and the front yoke
26 shown in FIG. The disc-shaped yoke 23 is provided with a hole 25 which coincides with the
hole 24 of the permanent magnet 5, and both are closely fixed. The front yoke 26 also has a
number of holes 29. The holes 29 are the same as the holes 24.25 in that they are vertically
aligned, but they are aligned at a position shifted by a half pitch in the horizontal direction (. и
Aligned (Fig. 3, Fig. 3 6)). ??????? The holes 24 communicate with the hollow portion 42
surrounded by one surface of the vibrating ribbon 1 o, while the holes 29 communicate with the
hollow portion 43I surrounded by the other surface. It is needless to say that a slight gap which
does not contact the vibrating ribbon loO leading edge and the @ surface yoke 26 is provided
between them. When a signal current is supplied to the electro-acoustic transducer configured as
described above through the lead wire 21. 22, an excitation force shown by an arrow in a
horizontal direction in FIG. 3 is generated in each example of the vibrating ribbon 10. As a result,
the hollow portion of the front yoke 26 is the bottom, and the hollow portion enclosed by one
surface of the vibrating ribbon 10, 42 produces positive pressure ? Po. Adjacent cavity 43 id
negative pressure -P. Produces These sound pressures are dipolar sound pressure P. Finally, the
holes 25 and 29 radiate in opposite directions to each other. In this case, although the slit
existing between both edges of the vibrating ribbon 10 and the end face of the magnetic circuit
acts as a leak and an impedance, its actance component should be ignored in the band above 30
Hz Lg. it can. The above shows an example in which the present invention is carried out for
headphones, and FIG. 7 shows the results of testing this using an artificial ear conforming to the
IEC international standards t and C. According to this, it is clear that sufficient wide band and
sensitivity can be obtained, and moreover, it can be made small. In the embodiment, the holes 24,
25. 29 are formed in round holes. Since round holes are suitable for drilling, it is preferable to
use round holes for small amplitudes, but it is easy to create a gap between the round hole end
and the vibrating ribbon end, so avoid it. The hole shape should be square or oval. FIG. 8 shows
an example thereof, in which square rod permanent magnets 30 are fixed parallel to each other
on the inner surface of a yoke plate 44 having a square opening 31 and a front yoke plate 45
having a square opening 32 is attached thereto. It is made to oppose 1 and arrange | positions
the vibration ribbon 10 among them.
If configured in this way, 1. Since it is not necessary to provide a hole in the permanent magnet,
it is easy to make the opening square or oval. FIG. 9 shows another embodiment, in which the
vibrating ribbons lO are disposed between the front and rear yoke plates 36. 37 in which the
permanent magnets 3 '4 and 35 are disposed laterally and brought into close contact with their
magnetic hard surfaces. Are arranged. The two yoke plates 36 and 37 are punched out with oval
shaped openings 38, 39 so that they are in the offset position as described above. With such a
construction, the processing of the permanent magnet becomes easy, and a strong one can be
used, so a dog can be obtained. Note that any of the above can also be used as a microphone. As
described above, according to the present invention, a vibrating ribbon having a conductor in the
longitudinal direction is stretched in a serpentine manner, and plate magnetic poles are disposed
opposite to each other at both ends of the vibrating ribbon with a minute gap therebetween. For
Since the magnetic field in the width direction is applied, the magnetic pole O interval can be
narrowed with a value 1 close to the width of the vibrating ribbon, and even a small permanent
magnet can produce a magnetic field of sufficient strength. However, it is possible to increase the
output of a heavy hit. In addition, the opposed plate-like magnetic poles form a plurality of
hollow portions separated by a vibrating ribbon between them, and the plate-like magnetic poles
(a large number of holes respectively provided in the selectively select the hollow portions) Since
it communicates with the outside, the actions of the EndPage: 4 cavities that generate (or receive)
sound pressures in opposite phase with each other can be arranged to generate (or receive) a
dipolar caesar. Therefore, an electroacoustic transducer of free size can be obtained by
lengthening the length of the p1 vibrating ribbon whose acoustic directivity direction is parallel
to the ridge of the vibrating ribbon (conventional ribbon type electroacoustic transducers The
width of the ribbon is determined by the width of the ribbon because the ridge of the ribbon is
directly irradiated with Vc. In addition, the length of the vibrating ribbon can be increased and
the number of conductors can be increased, and the impedance can be made to be about 1 to 8
?, so that the impedance matching force with the amplification circuit can be obtained. It will be
easier. In addition, if a plurality of vibratory ribbons configured as described above are stacked,
those having higher output and higher impedance can be obtained. Furthermore, since there is a
small 7.55 gap between both edges of the vibrating ribbon and both magnetic boxes, when this is
used for radhon, the pressure change in the ear cavity accompanying its attachment and
detachment is It can escape through this gap and reduce the discomfort that presses the
tympanic membrane
4. Brief Description of the Drawings FIG. 1 is a plan view showing the principle of a speaker using
a conventional folded diaphragm. FIG. 2 and the following show an embodiment of the present
invention, and FIG. 2 is a front view showing the main part of the first embodiment, FIG. 3 is a
plan view, FIG. 4 (5), B) is a perspective view 1 and a side view of the vibrating ribbon, FIG. 5 is a
close-up view of the conductor, and FIG. 6 is a rear view of the main part. FIG. 7 is a graph
showing characteristics, and FIGS. 8 and 9 are perspective views showing two other
embodiments. 5.30, 34. 35 иии Permanent magnet, 1 o и и и Oscillating ribbon, 16-19 и и и и и и и и и и и
25 shaped yoke, 24 25. 29 и и и hole, 31, 32, 38. 39 иии Opening и и и и и 26 front yoke, 27, 23 и и и
band, 36, 37, 44, 45 и и и и yoke plate, 42.43 и и и hollow portion. ???????? ?
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