JPS61121691A - Edge for speaker - Google Patents

Abstract

PURPOSE:To eliminate a distortion and to improve a straightness with respect to an amplitude by arranging in the circumferential direction pleats formed in a circular arc manner at the part of two fine cone surfaces, setting the position of two cone surfaces to about half of the edge width in a diaphragm direction, and constituting so that in two fine circular arc diameters, the diameter of the outer circumferential part is at least equal or larger than the diameter of the inner circumferential part. CONSTITUTION:The edge is constructed to have pleats formed in a circular arc manner at part of two fine cone surfaces and to arrange many pieces in the circumferential direction as one block bonded in a bent-shape from a plane point of a view. Two fine circular arc diameters are R1>=R2, the position of the intersection of two circular arcs is in the relation of (d)>=(e), and when e/(e+d) is >=40%, remarkable effects are obtained. The speaker using the edge of the present invention has a high pressure frequency characteristic which has especialy a lower area, less edge resonance and is flat, and the second distortion is less a swell.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a speaker used in various types of audio equipment.

Conventional configuration and its problems In general, speakers were constructed as shown in FIG.

That is, a frame 6 is connected to a magnetic circuit 5 formed by laminating and bonding a ring-shaped magnetite 3 on a plate 2 having a center pole 1 and a ring-shaped upper plate 4, and a frame 6 is attached to the periphery of this frame 60. An edge 8 such as a free edge is attached together with the gasket 7, and the periphery of a diaphragm 90 is connected to the edge 8. A damper 10 is provided at the center of the diaphragm 8 so that it fits correctly into the magnetic gap 11 of the magnetic circuit 6. The voice coil 12, which is supported at both ends, is coupled together, and a dust cap 13 is attached to the upper surface of the central portion of the imaging plate 8.

The shapes of conventional edges 8 in such speakers are shown in FIGS. 2a, b, and c. In FIG. 2, 8a and 8b have a down roll shape and an up roll shape, respectively, and 8C has a wavy shape. In the shapes of 8a and 8b, the rigidity of the oblique side of the roll was weak, so there were drawbacks such as machining/nozzle resonance easily occurring and distortion increasing when the amplitude was large. 8C has a shape that is resistant to large amplitudes, but because it is a waveform, the materials that can be used are limited, the lowest resonant frequency cannot be lowered, and the linearity with respect to amplitude is poor.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide an edge that absorbs stress distortion at large amplitudes and greatly improves linearity with respect to amplitudes. It is something to do.

Structure of the Invention In order to achieve the above-mentioned object, the present invention arranges pleats formed in a circular arc shape by parts of two minute conical surfaces in the circumferential direction, and the positions of the two conical surfaces are determined by a photographing plate. 4 of the edge width in the direction
0 to 60 inches, and the diameter of the two small arcs is such that the diameter of the outer circumference is at least the same or larger than the diameter of the inner circumference.This structure reduces distortion and improves linearity with respect to amplitude. can be improved.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

Note that since the structure of the speaker is substantially the same as that shown in FIG. 1, only the edge, which is a feature of the present invention, will be explained here. Figure 3.

4 and 6 show the shape of the edge of the present invention.

FIG. 3 is a plan view of the edge, FIG. 4 is a perspective view of the edge, and FIG. 5 is a sectional view of the edge. It has pleats formed in the shape of an arc with parts of two minute conical surfaces, and as shown in Figure 3, they are joined in the shape of a "<" when viewed from above. The structure was designed to accommodate The diameters of the two arcs are R1≧R2, and the position of the intersection of the two arcs is d
There is a relationship of ≧e, and there is a significant effect when e/(e+d) is a factor of 40 or more. If e ) d, the amplitude will be small, which will cause an increase in distortion at the time of large input.

Furthermore, if the oblique side of the edge is a straight line, the surface pressure strength of the edge will be weakened, and the distortion due to stress at large amplitude will increase. Since the intersection of the edges is located closer to the diaphragm than the center of the edge, if R2>R1, the outer arc will be significantly longer than the inner arc, which will reduce the amplitude and increase distortion. becomes. In the experiment, a 12-diameter edge was used, a foamed urethane sheet was used, and the molding conditions were a mold temperature of 200°C and a pressure of about 20SeC. The intersection point is located at the 46th edge width on the diaphragm side, and R,
, R2 were set to 1111011 and 9■, respectively. The edge width was 9 mm, and the edge height was 6.7 mm.

Figure 6 shows the relationship between Kerr displacement characteristics due to differences in edges. From this figure, the IJ = arity region is improved by about twice. Figure 7 shows the sound pressure frequency characteristics of the speaker using the conventional edge and the speaker using the edge of the present invention, and the second
Indicates the order distortion. f and h are the sound pressure frequency characteristics of the speaker using the edge of the present invention.

The second-order distortions q and i are the sound pressure frequency characteristics and second-order distortions of a speaker using a conventional roll edge.

A speaker using the edge of the present invention has a flatter sound pressure frequency characteristic with less edge resonance, especially in the low range, and also has less second distortion. When this speaker was placed in a box and its strength against the pressure received from inside the box at large amplitudes was measured, it was found that the reversal strength was approximately 14 times higher than that of a conventional roll edge because the pleats absorb distortion due to stress.

Effects of the Invention Since the edge of the present invention is configured as described above, it has high surface pressure strength, absorbs distortion due to stress at large amplitude, and enables flat sound pressure frequency characteristics with extremely high linearity. It is a major piece of industrial equipment.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a general speaker, Figure 2a,
b and c show the shapes of conventional edges, respectively;
Figures 3 to 5 are plan views, perspective views, and cross-sectional views of the edge of the present invention, Figure 6 is a Kerr displacement characteristic diagram of the conventional roll edge and the edge of the present invention, and Figure 7 is a diagram of the conventional roll edge. FIG. 3 is a characteristic diagram showing the sound pressure frequency characteristics and second-order distortion of a speaker using the edge of the present invention and a speaker using the edge of the present invention. 1... Center ball, 2... Mark/Plate,
3...Magnet, 4...Play5.
6...Magnetic circuit, 6...Frame, 7
...Gasket, 8...Edge, 9.
...Diaphragm, 1o...Damper, 11.
... Magnetic gap, 12 ... Voice coil, 13 ... Dust cap, 8a ... Down roll edge, 8b ... Up roll edge, 8C. ...Waveform edge. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (3)

[Claims] (1) A block with arc-shaped pleats formed from parts of two minute conical surfaces, joined in a dogleg shape in the center of the edge, is assembled in large numbers in the circumferential direction. Edges for arranged speakers. (2) The speaker edge according to claim 1, wherein the position of the intersection of the two conical surfaces is 40% to 50% of the edge width toward the center of the speaker. (3) The speaker edge according to claim 1, wherein the diameter of the two arcs is such that the diameter of the outer circumferential portion is at least equal to or greater than the diameter of the inner circumferential portion.