SU26266A1 - Cone Loudspeaker - Google Patents

Description

In loudspeakers with a cone-shaped diffuser, it is essential that the movement transmitted by the diffuser from the moving coil and spring-loaded core to. the possibilities were not distorted, not slowed down or absorbed by the supporting device, otherwise the sound is either muted or distorted in all or some frequency range, especially in the low frequency range. The present invention relates to a device of the aforementioned loudspeaker and consists in that its diffuser is fastened by means of cords attached to a fixed holder and located in the direction tangent to the surface of the diffuser or approximately in this direction, in a plane perpendicular or approximately perpendicular to the axis a diffuser so that the diffuser can freely deform and move in the axial direction and cannot move in a plane perpendicular to its axis.

In FIG. 1 is a side view of a loudspeaker with a diffuser reinforced according to the invention; FIG. 2 is a front view of this speaker; FIG. 3-5 depict modified forms of fastening with help and cords; FIG. 6-piece fastener; FIG. 7 shows schematically the oscillation of the cone of the diffuser in the direction normal to its surface.

The cone diffuser 1 (Fig. 1 and 2) has a cylindrical part 2, which is integral with it and a carrier coil 3 located in the annular space 4 formed between the pole shoes of the magnet 5. mounted on the base 7 by means of the rings 8. Tangent direction to the surface of the diffuser 1 near the base and its outer end at points 10 are attached cords 9, forming a square, to the corners of which cords 11 are fastened at one end. On the opposite side, cords 11 are fixed in holders 12 of spring material on the ring 6; installed on the base 7. The cords 9 can also be fixed on the outer edge of the diffuser 1, however, the mount described above, according to the author, is most appropriate.

Diffuser 1 is supported and centered using cords 13, similar to cords 9 and 11, mounted on mounting screws 14 mounted on brackets 15 attached to magnet 5. Attachment points of the suspension cords at the inner end of the diffuser and the attachment points of the suspension cords of the outer part of the diffuser must not lie in the same plane. It is desirable to arrange them in such a way that the planes passing through each point of attachment and the axis of the diffuser form equal angles between themselves, since this method of suspension allows the greatest freedom of oscillation of the diffuser,

In a modified embodiment of the diffuser (Fig. 3), the cords 9 are fastened at the corners of the square directly to the studs 16 carried by ring 6. In the device shown in FIG. 4, four cords 9, reinforced in the direction of the tangent to the surface of the diffuser 1, form the four sides of the octagon, the other four sides of which are formed by cords 17. Each corner point of the octagon is connected by cords 18 with ring 6.

It is obvious that the number of points of attachment of cords to the diffuser and the corresponding number of cords can be changed, for example, reduced

up to three by arranging the cords in the form of a triangle, however, in this case the sides of the triangle are such

. the lengths that the ring b, and with it all the structures are made bulky

The cords are fixed to the diffuser using small thin holders or washers 10 (Fig. 2). which, in turn, are attached to the diffuser. With this method of hanging, the cords do not touch the oscillating diffuser. Suspended cords 21 (Fig. 5) attached directly to the diffuser can also be positioned not in a direction tangential to its surface, but at a slight angle to this direction (on both sides of the attachment point), as shown schematically in FIG. 5, in which the angle of inclination is shown 3: really exaggerated. This method of connection eliminates the possibility of the occurrence of natural oscillations of the diffuser and interferes with the interaction between the cords. When mounting the diffuser of FIG. 5, special spacer holders may additionally be provided. One of the possible forms for making a centering and underlaying device is shown

in fig. 6. In it, each of the suspension cords is attached to a C-shaped spring 22, mounted on a slide 23 mounted on a bracket 24. The slide can be moved using a screw 25. In all the described devices, the cords 11 can be replaced or provided with coil or helical springs.

In order to avoid the occurrence of harmonics in structures in which the cords fastened to the diffuser are connected to the ring b also with the help of separate cords, the length of each of them may be different. The author notes that when using the loudspeaker of the described construction, when pulses are transmitted to the diffuser by a moving element, oscillations are created in the diffuser itself in the direction perpendicular to its surface. Such vibrations cause the diffuser to deviate from a normally circular shape and cause undulating deformations in planes perpendicular to its axis, and its elements at some X parts of the periphery for given frequencies are alternately removed and approach the relative average centers of these elements.

Obviously, for a diffuser with a free edge, the amplitudes of these oscillations are obtained most of all just for its free edge, i.e. at its largest diameter, at which these fluctuations can be smaller, equal or more longitudinal vibrations of the diffuser in the axial direction. It is also obvious that the formation of such undulating deformations is due to the impulse impulse transmitted by the driving element to create oscillations in the diffuser itself in the longitudinal direction with respect to its side walls. The complete and partial elimination of these oscillations in the supporting devices used up to the present time has degraded the quality and strength of the reproduced sound.

FIG. 7, a circle is a front view of a diffuser or a section of it with a plane perpendicular to its axis with a normal diffuser shape, i.e. in the case where the COS impulse transmission does not take place. The dashed lines and v correspond to the largest alternating deviations of the diffuser from its normal circular shape in its considered cross section when the impulses of a certain frequency from the side of the driving element are communicated to it. The deformations of the diffuser, similar to those depicted in the figure, are in effect, resulting oscillations occurring within the diff / zor itself. It is easy to see that the above-described suspension systems not only allow free axial movement of the diffuser, but also the free formation of such resultant oscillations that are perpendicular to the surface of the diffuser.

The suspension systems described above are, in addition, extremely rigid in a plane perpendicular to the axis of the diffuser, thereby preventing movement as a whole in the direction transverse to its axis.

The systems described are equally applicable in particular for correct reproduction of low-frequency sounds, since for perfect reproduction of sound very low;

the amplitude of movement of the diffuser to create sound waves of the correct amplitude. It should also be noted that in structures with springs, small changes in the length of the cords, due, for example, to changes in humidity or temperature, do not significantly affect the tension of the suspension system.

The subject of the patent.

A cone-shaped loudspeaker, characterized in that the diff | pattern is strengthened by means of cords attached to a fixed holder and located in a tangential direction or approximately in this direction to the surface of the diffuser on a plane perpendicular or approximately perpendicular to the axis of the diffuser, so that the diffuser can freely deform, deviate from its normal shape, and move in a seed direction (i.e., in a direction parallel to or approximately parallel to the driving force) and It could be moved transversely to the direction of said axis.