JPS6041520B2 - electrodynamic speaker - Google Patents

Description

[Detailed Description of the Invention] The present invention has appropriate compliance with respect to the force in the direction of the voice coil bobbin, good linearity even in large amplitude widths, and furthermore, The object of the present invention is to provide an electrically powered speaker equipped with a damper having a sufficient regulating force.

FIG. 1 shows a conventional private-type speaker.

In FIG. 1, 1 is a yoke with a center pole 2 integrally formed, 3 is an annular magnet fixed on the yoke, 4 is an annular plate fixed on the magnet 3, and this plate 4 An annular magnetic gap is formed between the inner peripheral surface of the center pole 2 and the center pole 2. 5 is a frame fixed on the plate 4, and 6 is a diaphragm. The outer circumference of the diaphragm 6 is supported by the frame 5 via an edge member (not shown).

A coil bobbin 7 is fixed to the diaphragm 6, and a voice coil 8 is wound around the coil bobbin 7.

Reference numeral 9 denotes a wave-shaped damper made by impregnating cloth with resin and heat-forming the damper.The inner peripheral part of this damper 9 is fixed to the coil bobbin 7, and the outer peripheral part is fixed to the frame 5.

10 is a dust cap attached to the diaphragm 6.

In the above-mentioned conventional electric speaker, the damper 9 restricts the movement of the coil bobbin 7 in a direction perpendicular to the coil, and allows the coil bobbin 7 to move in all axial directions. The conditions required for the damper 9 that holds the coil bobbin 7 are {a) appropriate conformance with respect to the direction of the coil bobbin, and good linearity even at large amplitudes, {b} ridges of the coil bobbin. Having sufficient stiffness in the direction, etc.

However, in the wave-shaped damper 9 in the conventional example, the stiffness of the damper 9 in the vertical direction is made sufficiently high to satisfy the above condition {b}, so the above condition {a) is not satisfied, and as shown in FIG. As shown by A, there was a drawback that the Kerr displacement characteristic of the dust cap 9 became non-linear when the amplitude was large.

For this reason, in conventional speakers, harmonic distortion occurs during reduction. The present invention eliminates the above-mentioned conventional drawbacks, and one embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

Figures 3 to 5 show a damper 1 used in an embodiment of the present invention.
1 is shown.

This damper 11 is constructed by bonding two damper plates 12 and 13 together at necessary locations and fixing them to an outer peripheral support ring. Each damper plate 12, 13 has the same shape, and has holes 14a, 1 into which the coil bobbin is inserted, respectively.
4b are formed, and bent portions 1 are formed on the outer periphery of each of the central support portions 15a, 15b.
Four damper pieces 17 connected via 6a and 16b
a, 17b, 17c, 17d, 18a, 18b, 18c
, 18d, each damper piece 17a-17d, 18a-18
It is composed of mounting parts 20a and 20b connected to the outer periphery of d via bent parts 19a and 19b. It is pasted. Each of the damper pieces 17a to 17d, 18a to 18d has two surface elements 2 connected through the bent portions 16a, 16b and bent portions 21a, 21b parallel to the bent portions 19a, 19b.
2a, 22b, 23ab, each surface element 22a,
Reinforcing ribs are formed on 22b, 23a, and 23b to increase surface rigidity. One damper piece 17a to 17d consisting of surface elements 22a and 22b is bent to be convex upward, and one damper piece 18a consisting of surface elements 23a and 23b is bent upwardly.
18d are bent downwardly to form a convex shape, and as shown in FIG.
, 15b. 24a, 24
b is a hole formed in each of the mounting portions 20a, 20b.

25 is an outer circumference support ring, and this outer circumference support ring 25
A hole 26 is formed in the hole 26 .

Attachment portions 20a, 2 on the outer periphery of the damper plates 12, 13
0b is adhered to the upper surface of the outer peripheral support ring 25 to form a damper. FIG. 6 shows a method and pick-up tool for gluing the mounting portions 20a, 20b to the outer peripheral support ring 25.

Reference numeral 27 denotes a flat plate-shaped odor control device, and a pin 28 is installed on the upper surface of this lining tool 27.

In FIG. 6, the adhesive 29 is applied to the necessary locations on the upper surface of the outer peripheral support ring 25, and the holes 29 of the outer peripheral support ring 25 are
is inserted into the pin 28 of the jig 27.

Next, the mounting portions 20a, 20b of the damper plates 12, 13 are pulled outward with a tensile force f, and the square damper cylinders in the contracted state are stretched, and the holes 20a, 20b of the damper plates 12, 13 are
4, 24b into the pin 28 of the jig 27, and
a and 20b are adhered to the upper surface of the outer peripheral support ring 25 to complete the process. Note that 301 is a dustproof net held between the damper plates 12 and 13. FIG. 7 shows the operation of the above embodiment, with the solid line showing the stationary state and the broken line showing the upwardly displaced state.

Square elements 22a, 22b, 23a, 23b form quadrilateral a,
b, c, and d are configured, and when the coil bobbin fixed to the central support section is displaced upward, point c is displaced to '' in the direction of the coil bobbin, and quadrilaterals a, b, c, and d are deformed. They become quadrilaterals a', b', c', and d'. Point c is displaced in the direction of axis 1, but not in the direction perpendicular to axis 1, because
Damper pieces 17b on both sides of damper pieces 17a and 18a
, 18b and 17d, 18d. According to the damper of this embodiment, as shown in FIG. 2B, it vibrates with good linearity even at large amplitudes. In the above embodiment, two damper plates of the same shape are bonded together, but the center support portion and the outer peripheral support portion of one damper plate may be removed.

Further, in the above embodiment, four sets of rectangular cylinders having four plane elements and which can be bent and expanded are provided, but it is sufficient to provide a rectangular cylinder at each outer periphery of the regular polygonal central support part. The present invention has the above configuration, and according to the present invention, the coil bobbin can be displaced only in the direction of the ball, and
It has the advantage of being able to vibrate with good linearity even when the amplitude is large, and reducing distortion in the large amplitude region.

Further, according to the present invention, the damper cylinder having a rectangular cylindrical shape is fixed to the outer peripheral support ring by being pulled outward against the force that tends to shrink it toward the center, so that the resting position is stabilized. That is, according to the present invention, the position of point c in the stationary state in FIG. 7 is always constant.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of a conventional working type speaker, Fig. 2 is a diagram of Kerr displacement characteristics of a damper of a secondary electrodynamic type speaker and an embodiment of the present invention, and Fig. 3 is a diagram of the Kerr displacement characteristics of a damper of a sub-electrodynamic type speaker and an embodiment of the present invention. FIG. 4 is a top view of the damper of the open-air type speaker according to an embodiment of the invention, FIG. 4 is a view taken along A-B in FIG. 3, FIG. FIG. 7, which is a perspective view when assembled, is an explanatory diagram of the operation of the damper. 7... Coil bobbin, 8... Voice coil, 11... Damper, 12, 13... Damper plate,
I4a, 14b...hole, 15a, 15b...
...Central holding part, 16a, 16b...Bending part, 17a~
17d, 18a to 18d... damper piece, 19a,
19b...Bent part, 20a, 20b...
・Mounting part, 21a, 21b...Bending part, 22a, 22b
, 23a, 23b... surface element, 24a, 24b...
... Hole, 25 ... Outer periphery support ring, 26 ...
...Hole, 27...Ball, 28...
Pin, 29...adhesive, 30...dustproof net. Figure 1 Figure 2 Figure 4 Figure 3 Figure 5 Figure 7 Figure 6

Claims (1)

[Claims] 1. A regular polygonal central support portion in which a hole into which a coil bobbin is inserted and fixed is formed, and a plurality of bendable and extensible rectangular cylinders connected to each outer periphery of the central support portion via bending portions;
The square cylinder has a mounting part connected to the outer peripheral part via a bent part and an outer peripheral support ring, and the mounting part is pulled and fixed to the outer peripheral support ring against the contractile force of the square cylinder. An electrodynamic speaker equipped with a damper.