JPS5931115Y2 - electrodynamic speaker - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electrodynamic speaker, in which the damper that supports the voice coil bobbin has good linearity, and the voice coil bobbin does not come into contact with the magnetic circuit even during large inputs, and the speaker operates without producing abnormal noise. It is a product that provides electric type speakers.

FIG. 1 shows a conventional electrodynamic speaker of this type.

1 is a yoke in which the center pole 2 is integrally formed; 3 is an annular magnet fixed on the yoke 1; 4 is an annular plate fixed on the magnet 3; An annular magnetic gap is formed between the ball 2 and the outer circumferential surface of the ball 2.

5 is a frame fixed to the plate 4; 6 is a diaphragm; the outer periphery of the diaphragm 6 is supported by the frame 5 via an edge member 7;

A voice coil bobbin 8 is fixed to the center of the diaphragm 6, and a voice coil 9 is attached to the voice coil bobbin 8.
is wound.

This voice coil 9 is inserted into the magnetic gap.

Reference numeral 10 denotes a wave-shaped damper, and the inner circumferential portion of this damper 10 is bonded to the voice coil bobbin 8 with an adhesive 11, and the outer circumferential portion is fixed to the frame 5.

The conditions required for the damper 10 that holds the coil bobbin 8 are (a) appropriate compliance in the axial direction of the coil bobbin and good linearity even during large amplitude, (b) diameter of the coil bobbin. It must have sufficient stiffness in the direction, etc.

However, the wave-shaped damper 10 in the conventional example
Since the stiffness of the damper 10 in the radial direction is made sufficiently high to satisfy the above condition, the condition (a) above is not satisfied, and the Kerr displacement characteristic of the damper 10 becomes non-linear when the amplitude is large. was there.

Therefore, in conventional speakers, harmonic distortion occurs in the low frequency range.

In addition, in the above conventional example, as shown in FIGS. 2 and 3, the inner peripheral edge of the damper 10 and the voice coil bobbin 8
Since the outer peripheral surface of the voice coil bobbin is only bonded in a circular shape with adhesive 11, if an uneven driving force is applied to the diaphragm 6 or an unbalanced load is applied due to reflection from the floor etc., the voice coil bobbin 8 is tilted as shown by the broken line, and the voice coil bobbin 8 is in contact with the center pole 2 or plate 4,
It had the disadvantage of generating abnormal noise.

The present inventors have already proposed a speaker equipped with a new damper that improves the nonlinearity of the Kerr displacement characteristics of the conventional damper and has excellent linearity.

Next, this damper will be explained with reference to FIGS. 4 to 6.

4 to 6 show the damper.

This damper is constructed by bonding two damper plates 12 and 13 together at necessary locations.

□ Each of the damper plates 12 and 13 has the same shape, and each has a rectangular central support portion 15a, 15b in which a hole 14a, 14b into which a coil bobbin is inserted and fixed is formed, and each outer periphery of this central support portion 15a, 15b. Bent portion 16a.

Four damper pieces 17a connected via 16b.

17b, 17c, 17d, 18a, 18b, 18c, 1
8d each damper piece 17a~17d, 18a~1
It consists of outer peripheral support parts 20a and 20b connected to the outer periphery of the damper plate 8b via bent parts 19a and 19b. Each is pasted together.

Each of the damper pieces 17a to 17d. 18a to 18d are bent portions 21a parallel to the bent portions 16a, 16b and the bent portions 19a, 19b.

Two surface elements 22a, 22b connected via 21b.

23a, 23b, each surface element 22a, 22b.

Reinforcing ribs are formed on 23a and 23b to increase the rigidity of the surfaces.

Damper pieces 17a to 17 consisting of surface elements 22a and 22b
d is bent to be convex upward, and the surface element 23a,
The damper pieces 18a to 18d consisting of 23b are bent so as to be convex downward, and as shown in FIG.
22b.

When viewed from the side, 23a and 23b have a quadrilateral shape.

FIG. 7 shows the operation of the damper, with solid lines indicating a stationary state and broken lines indicating an upwardly displaced state.

Surface elements 22a, 22b, 23a. 23b constitutes a quadrilateral a p b e C # d, and when the coil bobbin fixed to the central support section is displaced upward, point C is displaced to point C' in the direction of axis l of the coil bobbin, and quadrilaterals a, b,
c and d are transformed into quadrilaterals ab', c', and d'.

Point C is displaced in the direction of axis l, and damper pieces 17b on both sides of damper pieces 17a and 18a are not displaced in the direction perpendicular to axis l.

This is because it is regulated by 18b, 17d, and 18a.

In this way, according to the damper shown in FIGS. 4 to 6,
This has the advantage of being able to displace the coil bobbin only in its axial direction, vibrating with good linearity even at large amplitudes, and reducing low-frequency distortion in the large amplitude region.

In this way, the dampers shown in FIGS. 4 to 6 improve the Kerr displacement characteristics and prevent the occurrence of distortion at large amplitudes.
Also in this damper, the inner peripheral edge of the damper is fixed circularly on the line of the outer peripheral surface of the voice coil bobbin, so the first
Similarly to the conventional example shown in the figure, the voice coil bobbin may tilt and come into contact with the center pole 2 and plate 4.

The present invention provides a speaker that can prevent the voice coil bobbin 8 from tilting in a speaker using a damper shown in FIGS. 4 to 6. An embodiment of the present invention will be described below as shown in FIGS. I will explain it together.

In this embodiment, two damper plates 12 and 13 are bonded together at necessary locations to form surface elements 22ay 22b and 23a.

23b is connected to a triangular central support portion 15a,
15b is provided at each outer periphery via a bent portion.

As shown in FIG. 9, the feature of this embodiment is that the inner circumferential portions of the central support portions 15a, 15b of the damper are opened outward to form mounting pieces 24a, 241;
, 24b are bonded to the outer circumferential surface of the voice coil bobbin 8 using adhesives 25a and 25b, respectively, and since the voice coil bobbin 8 and the damper are bonded in an annular manner at two locations, the voice coil bobbin is prevented from tilting. It is something that

For example, as shown in FIG. 11, when a clockwise force F is applied to the voice coil bobbin 8, a force tries to compress the mounting piece 24a with a force y, and a force tries to compress the mounting piece 24b with a force y. A force F''C acts to pull the mounting piece 24b.

On the other hand, the dampers try to hold the center and suppress the rotation of the voice coil bobbin by applying reaction forces F d' and F d' (7), respectively.

In the above embodiment, the mounting pieces 24a and 24b are made by opening the entire inner circumference of the damper, but as shown in FIG. The pieces 24a and 24b may also be used.

The present invention has the above-described structure, and has the advantage that the Kerr displacement characteristic of the damper has excellent linearity and does not generate abnormal noise when the amplitude is large.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional electrodynamic speaker, Figure 2 is a sectional view of the main parts of the same speaker, Figure 3 is an enlarged view of part A in Figure 2, and Figure 4 is the top view of a conventional damper. 5 is a sectional view taken along line A-B in FIG. 4, FIG. 6 is a perspective view of the same damper, FIG. 7 is an explanatory diagram of the operation of the same damper, and FIG. 8 is an electrodynamic in an embodiment of the present invention. FIG. 9 is an enlarged view of part C in FIG. 8, FIG. 10 is a perspective view of the main parts of the electrodynamic speaker, FIG. 11 is an explanatory diagram of the speaker's operation, and FIG. The figure is a perspective view of main parts of another embodiment of the present invention. 1... Yoke, 2... Center pole, 3... Magnet, 4... Plate, 5... Frame, 6... ...diaphragm, 7
...Edge member, 8...Voice coil bobbin, 9...Voice coil, 12.13...
...damper plate, 14a, 14b...hole,
15a. 15b...Central support part, 16a, 16b...
...Bending portion, 17 a to 17 d, 18 a to 18
cl...damper piece, 19a, 19b...
...Bending part, 20a, 20b...Outer peripheral support part,
21a, 21b...Bending portion, 22a. 22b, 23a, 23b --- Plane element, 24a, 24
b...Mounting piece, 25a, 25b...Adhesive.

Claims (1)

[Scope of utility model registration request] A polygonal central support part in which a hole into which the voice coil bobbin is inserted is formed, a damper piece connected to each outer periphery of this central support part via a bent part, and a bent part on the outer periphery of this damper piece. and an outer circumferential support portion connected via a portion.
A damper is provided in which the central support portion and the outer peripheral support portion of two damper plates are bonded together, and a plurality of deformable rectangular cylinders made of the damper pieces are provided between the central support portion and the outer peripheral support portion. An electrodynamic speaker comprising a mounting piece with open legs provided on the hole edge of the central support portion of the damper, and the ends of the mounting pieces being adhered to the outer circumferential surface of the voice coil bobbin.