JPS6062796A - Structure of speaker edge - Google Patents

Abstract

PURPOSE:To attain the reproduction with less distortion of a support system by an edge with high fidelity and to attain rich reproduction for bass by allowing the edge to the prolonged and shrinked in the circumferential direction to the movement of a diaphragm to prevent the movement of the diaphragm from being restricted. CONSTITUTION:The structure is adopted for the edge 5 that the edge 5 consists of the 1st and 2nd sloped wall faces comprising small pieces 5-1, 5-2 bent upward or downward the diaphragm 1 from a frame 6, prolonged continuously ruggedly in the circumferential direction of the diaphramg 1, formed with V-shape cross section, the diaphragm 1, and the 1st and 2nd parallel wall faces made of small pieces 5-3, 5-4 provided between the 1st and 2nd sloped wall faces in parallel with the diaphragm 1, prolonged continuously ruggedly in the circumferential direction of the diaphramg 1 and formed with V-shaped cross section. Thus, the length of the edge 5 is shrinked and prolonged in the circumferential direction to the vibration of the diaphramg 1 and the edge 5 is moved smoothly without disturbing the movement of the diaphragm 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a speaker edge, and is particularly suitable for reciprocating motion, which is suitable for providing a speaker with a wide linear range of amplitude, low distortion, and high fidelity. The purpose is to provide a speaker edge with extremely low resistance.

Generally, roll edges are used for electrodynamic speakers.

FIG. 1 shows a conventional electrodynamic speaker.

In FIG. 1, lower plate 10. Annular magnet 1
1 and the upper plate 12 is provided with an annular slit 15. A voice coil 16 is inserted into the annular slit 16 provided in this field section 14, and the voice coil is wound. Voice coil bobbin 17
is supported by a frame 19 fixed to the plate 10 via a damper 18. Further, the cone 20 is supported by the frame via an edge 21. 22 is a gasket, and 23 is a dust cover. FIG. 2 shows an enlarged view of the cutting part. FIG. 2 shows the movement of the roll edge when the cone is displaced +ξ and -ξ. That is, when the cone is displaced +ξ, one point on the roll edge 21,
For example, point B moves to point B', and if displaced to -ξ, moves to B''.

Therefore, since dr1 changes in the radial direction, point B changes by 2 in the circumferential direction.
Elongation or contraction of πdT1 occurs, and this must be absorbed by the material, etc. Therefore, if the material is a material with poor elasticity such as cloth, vertical wrinkles will occur at the edges, resulting in poor linearity and distortion. Furthermore, even materials such as urethane, which have relatively good elasticity, cannot completely absorb expansion and contraction in the circumferential direction, resulting in poor linearity. Roll edges are structurally prone to twisting due to lateral displacement forces perpendicular to the father axis direction, and cannot be said to be good against rolling.

The present invention solves these conventional drawbacks,
The present invention will be described below with reference to drawings of embodiments.

FIG. 3 is a sectional view of a speaker using the speaker edge of the present invention, and FIG. 4 is a top view thereof.

A voice coil 2 is connected below the flat diaphragm 1, and a coil portion of the voice coil 2 is suspended in a magnetic circuit 3 by a damper 4.

- The end of the diaphragm 1 is connected to the frame 6 by an edge 5. The edge 5 has a structure that can expand and contract in length in the circumferential direction in response to vibrations of the diaphragm 1, and is designed to move smoothly without interfering with the movement of the diaphragm 1. That is, from the diaphragm 1 and frame 6 side, small pieces 5-1 and 5-2 having a substantially V-shaped cross section extend below the diaphragm 1. The small pieces 5-1 and 5-2 are continuous in a concave and convex shape in the circumferential direction and are connected to form a wall surface. A small piece 5-3, which also has a V-shaped cross section, extends in a direction parallel to the diaphragm 1 at b. Similarly, on the frame θ side, small pieces 5-4 having a V-shaped cross section extend in a direction parallel to the diaphragm 1 at the other ends 5-2-a and 5-2-b of the small pieces 5-2. These small pieces 5-3 and 5-4 are connected to each other by means of 5-b, and form an uneven wall surface in the circumferential direction and are continuous.

The motion of the edge configured in this way will be explained next.

FIG. 6 is a model of the constituent parts of the wall pieces 5-3 and 5-4 that connect the wall pieces 5-1 and 5-2. FIG. 6 is a top view thereof, and FIG. 7 is a plan view thereof. If a force is applied in the direction of the solid arrow and it contracts in that direction, then side 5-
3-c, 5-4-〇 and 5-3-d, 5-4-
ci, and at the same time 6-3-e and 5-4-e move in the direction of the dashed arrow, the sides 5-3-a and 5-3-b move upward by 1
Move so that 10-11-12 becomes smaller. For this reason, face 7
-8-11-10 and 8-9-12-11, plane 1O-1
Angle θ1 between 1-14-j3 and 11-12-15-14
It also moves to become smaller. The movement of the elements will be analyzed in FIGS. 8 and 9. Take the coordinates as shown in the figure and add a positive area in the direction marked O.

The 0 point is set as a fixed point for convenience. Suppose now that point B approaches point B' and point F approaches point F' by 1 in the Y-axis direction. Then, the coordinates of B'F' are B' (2°8, 8, 1°6
Beno 0) and move to F'(2, 8, -1, O), respectively.

Parallelogram ABCD that constitutes this element,! :CDEF
The size, side length, diagonal length, and angle themselves do not change unless the surface is deformed. Now, suppose that point D does not move in the above state. The length BD of the diagonal is 2°45, and B/D is 2.28, which is BD ~ B'D'''C. Therefore, the parallelogram must be deformed, which is contradictory. Where will point D be located?Since the two parallelograms are symmetrical about the X axis, it is obvious that the two parallelograms will move on the X axis.
, Y, Z), then Y=o...(1) On the other hand, from BD and = BD', (2-'X)"+ (2-Y)"+Z" = W-・-
@) Furthermore, CD = c D', so 1.322) Howl. From now on, point A is moving < point A' is (
3,3゜1, 1.322) Point F' is (3,3, -1
, 1,322). When this element contracts by 1 in the Y-axis direction, it contracts by 0.5 in the X-axis direction (corresponding to the circumferential direction at the edge). That is, it has been demonstrated that the element shown in FIG. 5 is a female element that can be expanded and contracted in the circumferential direction by rotating the parallelogram surface. Note that the ratio of deformation between the X axis and the Y axis can be divided into columns by appropriately selecting the dimensional relationship of each side. In other words, when a force is applied to the individual piece in the direction of the arrow in Figure 6, this individual piece contracts in the direction of the solid arrow and simultaneously contracts in the direction of the dotted arrow.On the other hand, if the direction of the force is If it is reversed, it will move in the opposite direction of the dotted arrow, and the points 7-9 and 13-15 will widen. In this manner, the element shown in FIG. 6 moves in the direction in which a force is applied and at the same time expands and contracts in a direction perpendicular to the force.

Next, we will explain how this element works when configured as an edge. FIG. 10 shows this movement in a simplified manner. In the steady state, it is at the position of the solid line, and when it moves up the trench, it is a dotted line, and when it moves down, it is a dashed-dotted line.

16 is the element explained earlier. Consider the case where you move to "first" and "second." The distance from the center of the diaphragm to the center of the element 16 changes from r to r, and the relationship is r2(r.If we consider the element 16, the initial length πr becomes πr2
must be reduced to Conversely, if it moves downward,
161dr changes to rl, and there is a relationship r(rl.Similarly, in 16, the length must extend from πr to πr1.In other words, as an element of 16, when it moves upward, it contracts and moves downward. If it is, it must grow.

As previously explained, the edge of this example in which the elements shown in FIG. 6 are arranged in the circumferential direction fully satisfies this condition because the elements can be expanded and contracted in the circumferential direction.

FIG. 11 shows another embodiment of the invention, showing a cross-section of the wall fitting connecting the elements of the pieces 5-3 and 5-4 to the frame 6 and the diaphragm 1 at the edge of FIG.

It is constructed of trapezoidal small pieces 5-5, 5-6 continuous in a concave and convex shape in the circumferential direction, and exhibits the same effect.

In the above embodiment, the wall pieces 5-1 and 6-2.5
-5 and 5-6 are bent downwards of the diaphragm 1, but it goes without saying that even if they are bent upwards, similar effects can be achieved.

As described above, in the speaker edge of the present invention, the edge expands and contracts in the circumferential direction with respect to the movement of the diaphragm, and does not hinder the movement of the diaphragm. Therefore, it is possible to realize a speaker with less distortion in the support system due to edges and capable of high-fidelity reproduction.

Furthermore, compared to a roll edge with the same edge width, it has the advantage that it has a wider amplitude range and can produce a speaker with a large amplitude, and when used for bass sounds, it can reproduce rich bass sounds.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional speaker, FIG. 2 is an explanatory diagram of the operation of the main parts of the same speaker, FIG. 3 is a sectional view of a speaker using the speaker edge of the present invention, and FIG. 4 is a top view thereof. Fifth
The figure is a perspective view of the essential page 10 of the same speaker edge, FIG. 6 is a top view thereof, FIG. 7 is a plan view thereof, and FIGS. 8, 9, and 10 are explanatory diagrams of the operation of the same speaker edge. FIG. 11 shows another embodiment of the speaker edge of the present invention, in which a is a plan view of the main part, and b is a plan view of the main part.
FIG. 5... Edge, 5-1, 6-2, 5-5
, 5-6...small piece, 5-3.5-4...
・Small pieces. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 21 Figure 5 6-2-a 5-2-fA Cause 6 Figure 7 Figure 10 Figure 11 b

Claims (3)

[Claims] (1) A first section that bends upward or downward from the speaker frame and the diaphragm and extends continuously in an uneven manner in the circumferential direction of the diaphragm. a second inclined wall surface;
A first slanted wall surface is provided parallel to the diaphragm between second inclined walls, and a first slant wall extending continuously in an uneven shape in the circumferential direction of the diaphragm.
．． a second parallel wall surface; A speaker edge characterized in that each of the second parallel wall surfaces is made up of small piece elements having a 7-shaped cross section, and these small piece elements are arranged in a V-shape in the circumferential direction of the diaphragm. structure. (2) First. 2. The structure of the speaker edge according to claim 1, wherein the second inclined wall surface is formed by continuously arranging small pieces having a substantially V-shaped cross section in an uneven pattern in the circumferential direction. (3) First. The second inclined wall surface has a trapezoidal cross section.
The structure of the speaker edge according to claim 1, characterized in that there is a page.