JPS61198900A - Piston diaphragm speaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to planar diaphragm type magnetic transducers or loudspeakers.

Prior art diaphragm magnetic transducers or loudspeakers must have a basic component consisting of a diaphragm having a vibrating region fitted with signal-conducting conductors. The conductor may be a circular conductor, a foil, or a strip of metal film. The transducer must also include a magnetic field source that acts on the diaphragm. As a result, the conductor is surrounded by a magnetic field, and when an audible frequency signal is applied to the conductor, the vibrating region of the diaphragm vibrates in synchronization with the frequency of the applied signal, producing sound of the desired magnitude and frequency.

Typically, a magnetic substrate near the diaphragm is the source of the magnetic field;
It has a soft iron plate with holes spaced from the diaphragm and a plurality of elongated magnetic strips spaced from each other on the soft iron plate. These magnetic strips interact with each other to cause a magnetic field to be emitted from the surface of the magnetic strips and across the diaphragm and the conductor thereon.

A typical diaphragm type magnetic speaker is disclosed in U.S. Patent No. 3.
674.946 and 3.929.499. In the former patent, the magnetic strip is part of a panel or sheet of magnetic material. In the latter patent, the magnetized band is physically shaped as a band of magnetic material. It is therefore clear that the magnetized band can take a variety of shapes.

Problems with the Prior Art All known conventional diaphragm magnetic speakers employ a diaphragm of thin film type material that is peripherally attached to a frame fixed to a magnetic substrate. In such transducers, the diaphragm is kept very taut within the elastic limits of the thin film material.

In some cases the thin film diaphragm was left somewhat loose.

Conventionally, however, the vibrating region of the diaphragm of such loudspeakers was reasonably deflected by the interaction of the signal current flowing through the conductor on the diaphragm and the magnetic field generated by the magnetized band of the magnetic substrate. The center of the vibrating region widens (moves) from its normal position in response to a signal current flowing through the conductor, while the edges remain substantially stationary. It contributes more to the generation of sound.

Therefore, since the sounds of low and intermediate frequencies are generated as raw material at the center of the diaphragm, there is a certain limit to the loudness of the generated sounds.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new planar diaphragm magnetic transducer that improves the magnitude of the acoustic output at bass frequencies.

A feature of the present invention is that in a diaphragm type magnetic speaker, the peripheral edge is a surrounding object, that is, a flexible joint (connection object).
by providing a diaphragm with a rigid or substantially rigid vibrating region attached to a rigid (rigid) peripheral frame. The substantially rigid vibrating region has a number of conductors spaced apart from each other over substantially its length and width. The substantially rigid vibrating region of the diaphragm can be made of any of a number of materials having a high stiffness-to-weight ratio and low density. Molded fibrous pulp, paper-like material with considerable stiffness, numerous reinforcing ribs or webs and honeycombs with hollows between them.
It is a rather thick plate-shaped molded styrofoam etc. in the shape of a honeycomb. Styroform thickness is 0.762~1,524
B (0.030 to 0.060 inches). Fibrous pulp can also be formed or shaped into a honeycomb shape for lightness and strength. It is also possible to use a rigid plate of pulsar wood to form the vibrating region of the diaphragm. Expanded bead technology materials made of carbon fiber or other carbon fiber materials can also be used. The vibrating region of the diaphragm can be molded, machined, or fabricated when using a diaphragm. Some of these materials can be used together for light weight and strength. The enclosure may be made of the same or different material than the substantially rigid material of the region and may be integral with the vibrating region or a separate body of material attached to the vibrating region. .

A particular advantage of the present invention when used with planar magnetic transducers is that the power handled by the transducer is increased for low frequencies and the acoustic output is significantly greater at low and intermediate frequencies. The entire vibrating area of the diaphragm, from end to end, undergoes essentially the same vibratory motion toward and away from the magnetized band behind the diaphragm. As a result, a significantly higher sound power output is obtained in the low frequency range than with conventional known loudspeakers with deflecting diaphragms.

In this rigid vibrating region diaphragm, the conductor can be provided on the diaphragm in six different ways. I would also use this type of diaphragm! Various magnetic circuits suitable for use can be used.

The conductors on the diaphragm can be arranged side by side. The width of the conductor band may be narrow (or sufficiently wide) compared to the spacing between adjacent magnetization bands of the magnetic substrate. A wide band of conductor covers all of the adjacent magnetization bands of opposite polarity. The conductors may also be glued in a stack, in which case the stacked conductors have a considerable thickness in the direction perpendicular to the plane of the diaphragm. In some cases, these stacked conductors are stiff. They may be incorporated into or molded directly into the rib or honeycomb configuration of the vibrating region. These stacked conductors act as ribs that increase the stiffness of the diaphragm, increasing the power handling capability of the transducer and reducing the Increase power in frequency.

Alternatively, the rigid vibrating region type diaphragm may be sandwiched between opposing magnetic substrates. At this time, the conductor on the diaphragm is affected by the magnetic field generated from both sides of the diaphragm. Since the opposing magnetic fields flatten the field, the magnetic flux lines optimize the forces generated on the diaphragm to cause it to vibrate at low frequencies.

Embodiment FIGS. 1 and 2 show an embodiment of the present invention. A rectangular transducer 10 has an acoustically transparent magnetic substrate 11 and a diaphragm 12. Transducers 10 come in a wide range of sizes and shapes, in some cases having a length of about 23 cIIL (9 inches) and a width of about 15 cWL (6 inches). In some cases, the length is also considerable, e.g. 90 to 122 cIr.
L (36-48 inches) or more length and 23-30α
(9-12 inches) wide. or the converter is the 13th
．． It can have a circular shape with a diameter of up to 7.6 cR (3 inches) as shown in Figure 14, or a different shape.

Magnetic substrate 11 includes a soft iron magnetic plate or armature 13 with a number of holes 14 to make it acoustically transparent.

The magnetic substrate also has a number of regularly spaced magnetic bands 15 as shown, but other arrangements may be used as shown in Figure 12.18. Magnetized bands 15 are located between the holes 14 to minimize interference with the holes 14 and minimize acoustic loading of the transducer.

The substrate includes a hard spacer or frame strip 16 that completely surrounds the outer periphery of the soft iron magnetic plate 13 and cooperates with other similar strips 17 to close the periphery 12 of the diaphragm.
．． 1 between them. Strip 16.1
7 is attached to the substrate 11 by mechanical fasteners such as rivets 18.
is fixed. Although the strips 16, 17 are made of steel, these peripheral strips 16, 17
The material is not important.

Magnetized band 15 may be made of any of a number of materials, but is typically made of rubber-bonded barium ferrite known under the trade name "Plastiform" from 3M Company, St. Paul, Minn., USA. (Can be done. Magnetized zone 15
is magnetized in a direction perpendicular to plate 13 and diaphragm 12, with the magnetic poles in front of them. The front face 15.1 of the magnetization band is polarized north over its entire length, and the front face 15.2 is polarized south over its entire length.

In some cases, it may be desirable to use a material that generates a strong magnetic field, that is, a large magnetic flux density, when the magnetized band 15 is located at the diaphragm.

In this case materials such as ceramic magnets can be used, such as samarium cobalt or other rare earth materials. Also, different magnetic circuits can be used as shown in FIG. Using opposing magnetic substrates on both sides of the diaphragm strengthens the magnetic field at the location of the diaphragm.

The rigid vibrating region 12.2 of the diaphragm 12 is dimensioned to face substantially the entire magnetic substrate 11 and in particular its opposite magnetized bands 15.

Diaphragms are made from a variety of materials with high stiffness-to-weight ratios and low densities in order to vibrate at most frequencies considered within the audio frequency range. In most cases, the vibration range of the diaphragm is approximately 20-15
It is expected to vibrate within the frequency range of 1,000 Hz, and in some cases up to 20,000 Hz.

Is the diaphragm 12 made entirely of one material?
or the substantially rigid vibrating region may be made of one material (including in 12.37), but the enclosure and the outer edge 12.1 may be made of another material. It may also be connected to the vibrating region.

Typically, the diaphragm may be made of a fibrous, 6 Luso, paper-like material that can be easily formed into the desired shape. Alternatively, the diaphragm may be made of styrofoam or carbon fiber type material or a combination of various materials (this would provide the necessary light weight, stiffness, and durability).The diaphragm may also be molded, machined, or They may be assembled in parts and joined together by adhesive or other means. In the case of multiple diaphragms, the vibrating region 12.2 of the diaphragm is preferably formed in the form of a honeycomb, as shown in FIG. A flat bottom plate 12 on a plane facing the magnetic substrate 11.
It is preferable to hold it at 4'. Ribs 12.5, 12.6, which extend transversely to one another and are molded in one piece, stiffen the vibrating region to a large extent. The vibrating region has a peripheral rib or rim 12.
．． 7, which joins the enclosure 12.3 to increase its rigidity and to ensure the connection with the enclosure. In this case, the vibrating region may be a simple flat plate with a constant thickness depending on the material used, as shown in Figure 5. In other cases, the diaphragm may be constructed in the form of a honeycomb, as in FIG. 7, with the second plate resting on it and concealing the honeycomb.

Besides that, the vibrating region of the diaphragm is substantially the sixth
A conductive wire as shown in the figure may be embedded in the rib of the diaphragm.

In FIG. 1.2, the vibrating region of the diaphragm has a number of runs 19 of conductors mounted on the flat surface of the base plate 12.4. Each running section 19 has a plurality of conductors Wst that are within the magnetic field generated by the magnetization strips. The conductor runs 19 are spaced apart from each other over the width of the vibrating region, each run being within the magnetic field generated by a pair of magnetized bands 15. The length of the magnetized band 15 and the running portion 19 of the conductor are approximately the same. The conductors are sized to carry the required signal current, typically 24-32 gauge.

When an audio frequency signal current is applied to the conductor, for example from terminal 19.1, the vibrating region 12.2 of the diaphragm oscillates towards and away from the magnetic substrate 11, with a pitch equal to the frequency of the applied signal current. Generates a sound with a frequency of vibration. The enclosure 12.3 deflects, but the substantially rigid vibrating region 12.2 moves under the influence of the signal current and the magnetic field, which cooperate over its entire width and length (all parts of the vibrating region of the diaphragm have essentially the same motion.The result is improved transducer efficiency, higher power output, and greater volume than previously available, especially at low and intermediate audio frequencies.

In the embodiment of the transducer 20 of FIG. 3, the conductor 21 is not a circular wire as shown in FIG. is essentially the same as that in Figure 1.2. Flat conductor strips can also be formed by applying a metal coating to the diaphragm and removing the unnecessary parts by etching. The operation of the embodiment is described in Section 1.2.
It is essentially the same as shown in the figure. The thickness of the foil is 0, 2
May be 54 mm (0,010 inches) or larger;
Pass the desired signal current. Each running section of the foil strip is insulated from one another by a space having a width on the order of the thickness of the foil.

In FIG. 4, the transducer 30 has a substantially rigid diaphragm 31 in the form of a simple plate of low-density material in a honeycomb structure with multiple cells and holes 31.1'. is made of bulk plastic and has a high stiffness-to-weight ratio.

Alternatively, the diaphragm may be made of styro 7 ohm or other stiff lightweight material such as a stiff slab of pulsar wood or similar material. In this embodiment, magnetic substrate 32 is essentially the same as substrate 11 of FIG. 1.2. Additionally, a second substantially identical magnetic substrate 33 is located opposite magnetic substrate 32 with the vibrating region of the diaphragm sandwiched therebetween. Both magnetic substrates 32,33 are spaced apart from the diaphragm, are acoustically transparent, and have magnetized bands 34 as described above. In the substrates 32 and 33, magnetized bands of the same polarity face each other. The running portions 35, 36 of the conductor are applied to the open side of the diaphragm 31. Alternatively, one conductor may be omitted depending on the power required.

In the embodiment of Figure 4, the operation is much the same as that of Figure 1.2, except that the magnetic fields are generated from both sides of the diaphragm and their interaction creates a very flat magnetic field at the diaphragm. be. This flat magnetic field optimizes the force that causes the diaphragm to vibrate.

Again, the substantially rigid vibrating regions of the diaphragm have substantially the same movement on their opposite sides.

In FIG. 5, the conductors 41 on the substantially rigid vibrating region 42 of the diaphragm are stacked and glued together and attached to the face of the diaphragm 40. In FIG. conductor 4
1 is stacked high enough to extend substantially to the level of the magnetized strip 43, but it is
In the space between. Since the conductor 41 extends slightly beyond the ends of the magnet substantially as shown in FIG. 1, there is no interference between the conductor 41 and the magnetic strip. The stacked conductors have the effect of stiffening the diaphragm, and!
increases the power handling capability of the converter at low frequencies.

In FIG. 6.7, the transducer 50 has an open honeycomb-shaped diaphragm 51, the conductors 52 being embedded directly within the ribs 51.1 of the diaphragm. The ribs 51.1 extend generally parallel to the magnetization bands 53 in the longitudinal direction of the transducer, so that they extend into and out of the spaces between the magnetization bands. The diaphragm 51 also extends laterally to the rib 51.1.
1 and the reinforcing ribs 51.2' integrally molded! ! 'Please be careful about having. In FIG. 7, the magnetized bands 53 are arranged at spaced apart end surfaces 5 facing each other at an intermediate position.
3.1, such that the transverse reinforcing ribs 51.2 fit between them during vibration of the diaphragm.

Because the conductor is embedded within the ribs in this embodiment, the conductor provides greater power handling capability and contributes to the strength and stiffness of the diaphragm 510.

The transducer 60 of FIG. 8 is very similar to the embodiment of FIG. 4, having a pair of opposed magnetic substrates 61, 62 with a diaphragm 63 between them.

The stacked conductors 64 are placed on both sides of the diaphragm 63 with conductor running portions 63.1'ik in the space between the magnetized bands 65, so that they do not interfere (collide) with the magnetized bands.

The stacked conductors 64 increase the stiffness of the diaphragm 63 and also make the diaphragm thicker (
make it vibrate.

The transducer 70 shown in FIG. 9.10 is similar to the transducer 60 of FIG.
have. In this embodiment, the magnetization band 7 of the magnetic substrate 71
4 extends perpendicularly to the magnetization band 75 of the magnetic substrate 72 on the opposite side. Therefore, the conductor 76 on the diaphragm 73 on the side of the magnetic substrate 71 extends parallel to the magnetized bands 74 in the space between the magnetized bands. The stacked conductor 77 extends on the surface of the diaphragm 73 on the side of the magnetic substrate 72, parallel to the magnetization band 75 and perpendicular to the conductor 76. Magnetic substrates 11 on both sides.
The magnetic field from 12 is applied substantially exclusively to the conductors 76 on each side.
．． It interacts with the current in 77 to vibrate the acoustically generating vibration region of the diaphragm.

In FIG. 11, transducer 80 is substantially the same as transducer 30 of FIG. 4, except that diaphragm 81 is made of plates 82, 83 glued together. Board 82.8
One or both of the contact surfaces of the plate can be provided with ribs to make the whole a double doll, and one plate can be provided with an enclosure and a mounting edge for connection to the frame. There are conductors 85.86 on the plate. The combined diaphragm plates 82,83 increase the stiffness of the diaphragm.

In FIG. 12, transducer 90 is substantially the same as that in FIG. 4, except that a different modified magnetic circuit is provided on magnetic substrate 91.91.1.

Soft iron plate 92 has magnetized bands 93 between holes 940 and facing diaphragm 95 . The magnetized bands 93 are on their front side 93.1
．． 93.2 are arranged to have a predetermined series of magnetic poles. This sequence is north, south, south, north, north, south, south, north, repeating. In this magnetic circuit, adjacent functional pairs of magnetized bands 93 having opposite polarities are connected to a diaphragm 95.
Since a magnetic field with increased strength is generated at the position, a large gap can be provided between the surface of the magnetized band and the diaphragm. Adjacent magnetized bands that are not in the same functional pair are of the same polarity, thus creating a neutral or dead zone with substantially no magnetic field, such as in space 96.

In the transducer 90, the conductor 97 on the diaphragm is a wide band spanning the entire width of the functional pairs of magnetized bands and the space between them. The magnetic field is flat due to the opposing magnetic substrates, and the force applied to the diaphragm K is optimized.

In FIG. 13, transducer 98 has substantially the same characteristics as transducer 10 of FIG. 1.2 except that it is oval or elliptical. Transducer 99 of FIG. 14 also has substantially all the features of transducer 10 except that it is circular.

Note that the conductors 98.1.99.1 of the two transducers 98.99 vary slightly in length relative to each other in order to accommodate the curved periphery of the vibrating region.

The transducer 100 of FIG. 15 is very similar to the transducer 90 of FIG. 12, except that the diaphragm has a substantially rigid vibrating region 101 embedded with an FC conductor 102. The vibrating region of the diaphragm can be molded integrally with the conductor. As mentioned above, the area 101 is made of styrofoam (
I can do that.

All of the rigid diaphragms mentioned above are connected to the peripheral frame (+J-tube and the substrate by a flexible enclosure), but the rigid diaphragm is connected in a predetermined relationship to the magnetized band while vibrating without substantially deflecting. Other devices can also be used to hold and hold the. For example, a bearing hole can be provided in a corner of the diaphragm through which a stationary mounting post can be inserted, allowing the diaphragm to slide freely on the post. There is no frame strip around the periphery of the diaphragm, but it can be guided in close proximity to the frame strip, preferably but not necessarily in a substantially air-tight relationship. Also, instead of using such posts, flexible links may be used to connect the frame strip and the diaphragm to hold the diaphragm in alignment with the magnetization band.

Transducer 110 of FIG. 16 is very similar to transducer 90 of FIG. 12, except that the diaphragm is fabricated on paced film 112 and connected to frame strip 113 at the outer edge 112.1 of film 112. ing. Film 112 is 0.00635 to 0.12
The conductor 11 can be made of any of a variety of materials, such as a polyester film known as Mylar with a thickness of 0.005 to 0.005 inches.
4 is provided on the film 112. A substantially rigid plate 115 of styrofoam or other similar plastic material is placed over the conductor 114 and attached to the film 112. The rigid plate 115 provides a rigid vibrating region of the diaphragm. As an option, add another plate 116 to the film 1120.
It may be attached to the opposite side to increase the loose stiffness. In this embodiment, when a signal current is applied, two plates 1
15.116, the entire diaphragm undergoes considerable movement. However, these plates do flex to a certain extent.

The transducer 120 of FIG. 17 is similar to the transducer 9″0 of FIG. 12 except for the diaphragm 121 which is made of a rigid plate 122 of Styrofoam or other rigid material and a plate 123 of Mylar or other flexible film-type plastic material bonded together. The conductor 124 is substantially similar to the rigid plate 122 and the film plate 12.
3 and is substantially buried in a hard plate 122. The rigid plate 122 has a flat peripheral connecting plate 125 and a peripheral edge 126, the latter being attached to a frame strip 127. Optionally, another substantially rigid plate 128t film plate 1230 can be attached to the opposite side to increase stiffness.

Like the transducer 110 of FIG. 16, the diaphragm 121 of the transducer 120 moves considerably over its length and width when a signal current is applied to the conductor, but it flexes slightly so that the center of the diaphragm is made up of the periphery. The stroke is thick (
Become.

FIG. 18 shows a variation of the magnet structure that can be used in any of the above embodiments of the transducer. Magnet structure 130 is sheet or plate-like and can be formed or die-cut into the shape shown. This magnet structure is made of the same materials as described for the magnet strip in FIG. 1.2. Several slots 131 are created to define spaces between magnetized bands 132.

These slots align with holes in the iron or steel plate of the magnetic board. A narrow bridge 133 crosses the slot and interconnects adjacent magnetized bands 132. The magnetized strip can have its top surface magnetized to a magnetic pole as shown or can be magnetized according to a desired magnetic circuit.

It will be appreciated that the transducer of the present invention has a substantially stiff vibrating region of the diaphragm made of a low density material with a high stiffness to weight ratio. The conductor spans substantially the entire length or peak of the vibrating region and extends substantially the entire length so that substantially all portions of the vibrating region experience substantially the same motion. A flexible surround around the periphery of the vibrating region allows for substantially uniform vibrating motion over the entire length and width of the vibrating region.

[Brief explanation of drawings]

FIG. 1 is an elevational view of a typical diaphragm magnetic transducer or speaker employing the present invention, with portions cut away to show details. FIG. 2 is an enlarged detailed cross-sectional view taken generally along line 2--2 of FIG. FIG. 3 is an enlarged detailed sectional view of an alternative embodiment of the invention. FIG. 4 is a detailed sectional view of a second modified embodiment of the invention. FIG. 5 is a detailed sectional view of another modified embodiment of the invention. FIG. 6 shows still another embodiment of the present invention, in which line 6--
FIG. 6 is a detailed sectional view along line 6; FIG. 7 is a detailed cross-sectional view taken along line 7--7 of FIG. FIG. 8 is an enlarged detailed cross-sectional view of yet another embodiment of the invention. FIG. 9 shows still another embodiment of the present invention, in which line 9 in FIG.
FIG. 9 is an enlarged detailed cross-sectional view along -9; FIG. 1O is a detailed cross-sectional view taken along line 10--10 of FIG. FIG. 11 is a detailed sectional view of another embodiment of the invention. FIG. 12 is a detailed sectional view of yet another embodiment of the invention. FIG. 13 is an elevational view of a somewhat differently shaped speaker according to an embodiment of the invention. FIG. 14 is an elevational view of another speaker having a different shape according to an embodiment of the present invention. FIG. 15 is a detailed sectional view of yet another embodiment of the present invention. FIG. 16 is a detailed sectional view of still another embodiment of the present invention. FIG. 17 is a detailed sectional view of yet another embodiment of the present invention. FIG. 18 is a detailed plan view of another embodiment of a magnetic sheet that can replace the magnetized strips in the above figures. 10.20.30, Converter, 11.
・・・・・・・・・Magnetic substrate, 12・・・・・・・・・
・Diaphragm, 12.5.12.6・・・・・・・・・
・Rib, 14...hole, 19...
·····conductor

Claims (28)

[Claims] (1) a generally flat, rigid, acoustically transparent magnetic substrate containing a plurality of parallel and spaced apart elongated magnetized bands; A diaphragm with a rigid and inflexible vibrating region with a conductor through which an extending signal passes, and a connecting device that connects the diaphragm to a substrate and causes the entire vibratory region to vibrate under the interaction of a magnetic field and a signal current in the conductor. A converter in which a signal current flows, the magnetized strip is magnetized in a direction perpendicular to the substrate, adjacent magnetized strips have opposite polarities, and a magnetic field is emitted outward from the front of the magnetized strip. (2) A transducer according to claim 1, wherein the connecting device is flexible and formed integrally with the vibrating region of the diaphragm. 3. The transducer of claim 2, wherein the stiffening plate is attached to the vibrating region of the diaphragm. 4. A transducer according to claim 1, wherein the connecting device is flexible and made of a material different from the vibrating region of the diaphragm and is attached to the vibrating region. 5. The transducer of claim 4, wherein the vibrating region comprises a rigid plate with a conductor, and the connecting device comprises a plastic film attached to the vibrating region of the diaphragm and connected to a magnetic substrate. 6. The transducer of claim 1, wherein the vibrating region of the diaphragm has elongated ribs extending across it and stiffening it. (7) The conductor is embedded in the rib of the diaphragm,
Converter according to claim 6. (8) The transducer according to claim 1, wherein the conductor is attached to the surface of the vibrating region of the diaphragm. (9) The transducer according to claim 1, wherein the conductor is embedded in the vibrating region of the diaphragm. (10) The conductor is made up of a plurality of conductor elements that are wide in width, and are opposed to magnetized bands of opposite polarity and cross the magnetic field generated from them. converter. (11) The transducer of claim 1, wherein the conductor comprises a plurality of conductor elements stacked on top of each other on the vibrating region of the diaphragm. (12) a generally planar, rigid, acoustically transparent magnetic substrate having a plurality of spaced apart magnetization bands and a plurality of spaced-apart, opposing magnetization bands in front of and extending along the magnetization band; , a vibrating region having a conductor running portion through which a signal current flows;
a diaphragm having a connecting region connecting a peripheral edge of the diaphragm to a magnetic substrate, the magnetized bands having front faces substantially in one plane, and the magnetized bands being magnetized in a direction substantially perpendicular to their front faces; ,
Adjacent magnetized bands are magnetized with opposite polarities and emit an elongated magnetic field outward from their front, and the vibrating region of the diaphragm is much stiffer than the connecting region, and the connecting region flexes to cover the entire vibrating region. is a transducer through which an oscillating current flows, which oscillates under the interaction of a magnetic field and a signal current in a conductor. (13) The transducer according to claim 12, wherein the conductor includes a plurality of conductor elements attached to the vibrating region, greatly increasing the stiffness of the vibrating region. (14) The transducer according to claim 12, wherein the magnetic substrate is an acoustically transparent soft iron plate to which the magnetized band is attached. (15) A plurality of parallel, spaced-apart objects whose front faces lie in one plane, which are magnetized perpendicular to the front face and generate a magnetic field outward from the front face, with adjacent ones having opposite polarities. A pair of generally flat, rigid, acoustically transparent magnetic substrates, each containing elongated magnetized bands, spaced apart such that the magnetized bands of the same polarity face each other, and a pair of generally flat, rigid, acoustically transparent magnetic substrates each containing elongated magnetized bands and spaced apart such that the magnetized bands of the same polarity face each other; A hard, hard-to-flex, vibrating region with a conductor on its surface through which a signal current flows, is located between the magnetic substrates at a distance from the magnetized band, and the vibrating region is connected to the substrate, so that the entire vibrating region is exposed to the magnetic field. A transducer through which a signal current flows, comprising a diaphragm with a device for oscillating under interaction with the signal current in the conductor. 16. The transducer of claim 15, wherein the conductor includes a plurality of conductor elements that collectively form a wide pad that faces and traverses the magnetic field emanating from adjacent magnetic bands of opposite polarity. (17) the conductor includes a plurality of conductor elements stacked and glued together on the diaphragm to act as reinforcing ribs to increase the stiffness of the vibrating region and to cause substantially the same vibratory motion in all vibratory regions; A converter according to claim 15. (18) The transducer according to claim 15, wherein the conductor is embedded in the vibrating region of the diaphragm. (19) The transducer according to claim 15, wherein the conductors are located on both sides of the vibrating region of the diaphragm and face the magnetized bands on the same side. (20) The converter according to claim 15, wherein every other magnetization band has the same polarity. (21) A plurality of parallel and spaced elongated facades in one plane, perpendicular to the facades...
- An elongated magnetization that is magnetized in a series of polarities such as north, south, south, north, north, south, etc., and generates a magnetic field that crosses the entire width of the opposite polarity from the front outward. a pair of generally flat, rigid objects, each containing a pair of generally flat, solid, spaced-apart magnetized bands of the same polarity that are oppositely spaced so that the magnetic field is compressed so that the lines of magnetic field run substantially parallel to the front faces of the magnetized bands; , an acoustically transparent magnetic substrate, and a plurality of magnetic substrates each assembled to form a wide flat running section across the magnetic field facing substantially the entire width of the magnetized bands of opposite polarity and the space between them. A plurality of vibrating regions including conductor elements, which are hard and hard to bend and have conductor running portions through which signals flow, are located between the magnetic substrates at a distance from the magnetized zone, and the peripheral edges of the vibrating regions are connected to the substrate. The diaphragm has a flexible device that causes substantially the same vibrational motion under the interaction of a magnetic field and a signal current in the conductor in the vibrating region, and is capable of handling large powers and generates acoustic waves in the low frequency region. A converter through which a signal current flows, greatly increasing the output. 22. The transducer of claim 21, wherein the conductor element has a substantially flat shape parallel to the vibrating region of the diaphragm. (23) The transducer according to claim 1, wherein the vibrating region of the diaphragm is made of styrofoam. (24) The transducer according to claim 1, wherein the vibrating region of the diaphragm is formed into a honeycomb structure having open cells therein. (25) The transducer according to claim 1, wherein the vibrating region of the diaphragm is formed of a multi-laminate of high-strength, low-density materials. (26) The transducer of claim 1, wherein the vibrating region of the diaphragm is made of fibrous pulp material. (27) The transducer according to claim 1, wherein the vibrating region of the diaphragm is made of carbon fiber material. (28) The transducer of claim 1, wherein the vibrating region of the diaphragm is made primarily of balsa wood.