JPH04111597A - Electrodynamic loudspeaker - Google Patents

Abstract

PURPOSE:To prevent a distortion by a damper, and to stabilize the movement of a diaphragm and a voice coil as well by protruding the center part of the diaphragm backward, and arranging the voice coil and a magnetic circuit in front of the diaphragm and the damper at the back of the diaphragm. CONSTITUTION:The center part of a diaphragm 10a is protruded backward, a voice coil 7a on a coil bobbin and the magnetic circuit are arranged in front of the center of the diaphragm 10a, and a damper 12a is arranged at the back of the diaphragm 10a. Since the damper 12a is behind the diaphragm 10a, a sound wave emitted from the damper in accordance with the vibration of the voice coil 7a is interrupted by the diaphragm 10a and an edge 9a, is not propagated to a forward listening position, and does not apply the distortion to a sound from the diaphragm. And the edge 9a is provided with the outer peripheral edge of the diaphragm 10a, and also the damper 12a can be attached to the inner peripheral edge of the diaphragm 10a or further backward through a coil bobbin 6a. Thus, it is possible to obtain a space between the edge and the damper widely, and the movement of the diaphragm and the voice coil are stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electrodynamic speaker used in various audio equipment.

<Prior Art> Conventionally, a thin electrodynamic speaker has been constructed as shown in FIG.

That is, by placing a donut-shaped magnet 1 on the upper surface of a yoke 2 with a pole piece 3 protruding from the center, and further placing a top plate 4 on the upper surface of the magnet 1, the pole piece 3 and top plate 4 are separated. 3-22 is fixed on the frame S by forming a magnetic gap 5 between them! death,
A normal reverse diaphragm 10 with a cone-shaped center protruding forward is fixed to the peripheral edge of the frame 8 via an edge 9. A base end of a coil bobbin 6 with a voice coil 7 interposed and held between the magnetic gap 5 is attached to the center part, a cover 11 is fixed on the front surface of the periphery of the frame 8, and the base end of the coil bobbin 6 is attached to this. It was constructed by holding the peripheral edge of a damper 12 whose end was supported, and furthermore, a dust cap 13 was attached to the upper end of the coil bobbin 6.

Another conventional example of a thin electrodynamic speaker is one in which the mounting position of the damper 12 in FIG. 3 is changed, as shown in FIG. 4. That is, a damper support part 4'' is integrally formed to protrude from the upper surface of the top plate 4 near the magnetic gap 5, the inner peripheral edge of the damper 12 is attached to this damper support part 4°, and the outer peripheral edge is attached to the diaphragm 10. By attaching it to an intermediate position, the diaphragm 10 is held.

<WIAM to be solved by the invention> In the 31st W speaker, the damper is located in front of the diaphragm (
Because the damper is on the side where sound waves propagate), the sound waves emitted from the damper as the voice coil vibrates interfere with each other, resulting in distortion of the sound.

Furthermore, in the example of FIG. 4, as shown in the schematic diagram of FIG.
The voice coil 7 is supported by two supports (springs) 1, which prevent the bobbin 6 of the voice coil 7 from tilting. Therefore, in order to stabilize the operation of the voice coil, the edges and the damper 12. It is important to make the interval a large. However, in the speaker shown in Figure 4, the edges are located on the outer edge of the diaphragm, and the damper is installed between the outer and inner edges of the diaphragm, so the gap between the edge and the damper cannot be increased, and the voice coil It is difficult to stabilize the operation of the

Means for Solving the Problems> In order to solve the above problems, the present invention makes the center part of the diaphragm convex rearward, and arranges the voice coil and magnetic circuit on the coil bobbin in front of the center of the diaphragm. And, it is arranged behind the damper 3S moving plate.

Since the damper is located behind the diaphragm, the sound waves emitted from the damper due to the vibration of the voice coil are blocked by the diaphragm and the edges and reach the 1! It is not propagated to the storage position and does not distort the sound from the diaphragm.

In addition, since the edges are provided on the outer periphery of the diaphragm and the damper can be attached further to the rear via the inner periphery of the diaphragm or the coil bobbin, a large gap can be secured between the edges and the damper, and the diaphragm and voice coil can be Operation becomes stable.

<Embodiment> Hereinafter, the present invention will be explained in detail with reference to the embodiment shown in FIGS. 1 and 2. In FIG.
Place the donut-shaped magnet 1a on the adjacent stage! A top plate 4a is attached to the rear part of the top plate 4a through the magnet, and an outer magnetic type magnetic circuit 14 is formed through a magnetic gap 5a formed between the inner peripheral part of the top plate 4a and the pole piece 3a. do.

The upper surface of the yoke 2a is fixed to the frame 8a, and a cone-shaped diaphragm 10a whose center protrudes rearward behind the pole piece is provided on the lower peripheral edge of the Makoto frame.
A peripheral edge 9a is attached to the diaphragm 10a, a rear end of a coil bobbin 6a with a voice coil 7a interposed between the magnetic gap 5a is attached to the center of the diaphragm 10a, and an edge of a cover 11m attached to the frame periphery. By adhering the outer peripheral edge of the damper 12a to the magnetic gap 5a and connecting the center portion of the damper 12a to the rear end of the coil bobbin, the voice coil is held without eccentricity between the magnetic gaps 5a. A dust cap 13a is attached to the lower end of the coil bobbin 6a.

Figure 2 shows the outer magnetic type magnetic circuit in Figure 1 as inner magnetic type magnetic circuit 1.
This is an example in which magnet 1b is replaced with magnet 1b.
Attach the yoke 2b to the front of the magaut 1b, and the pole piece 3b to the rear of the magaut 1b! -Constructed by adhesive.

Similarly to the above, a magnetic gap 5a is formed between the inner peripheral portion of the rear end of the cork 2b and the pole piece 3b, and the voice coil 7a is interposed between the magnetic gap.

With this configuration, the edge can be attached to the front outer periphery of the diaphragm, the damper can be placed behind the diaphragm, and the damper can be extended to the inner periphery of the diaphragm or further to the rear. Since it can be attached to the end of the voice coil bobbin, the gap between the edge and the damper can be increased, and the operation of the voice coil is stabilized. Furthermore, if the shapes of the frame and magnetic circuit are well designed, it can also be used as a differential user.

<Effects of the Invention> As described above, in the electrodynamic speaker of the present invention, the central part of the diaphragm protrudes rearward, the voice coil and the magnetic circuit are arranged in front of the diaphragm, and the damper is placed in front of the diaphragm. By placing it at the rear, it prevents distortion caused by the damper and stabilizes the diaphragm, which stabilizes the movement of the voice coil, resulting in unique effects such as improved sound quality and input resistance. have

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a half-sectional view of a speaker, FIG. 2 is a half-sectional view of a speaker showing another embodiment, and FIGS. 3 to 5 show a conventional example. FIG. 3 is a half-sectional view of an electrodynamic type speaker, FIG. 4 is a half-sectional view of the other speaker, and FIG. 5 is a conceptual diagram of a voice coil support system. 6a...Coil bobbin, 7a...Voice coil, 8
a...Frame, 10a...Diaphragm, 12a...
・Damper, 14...Outer magnet type magnetic circuit, 14°・
・Inner magnetic type magnetic circuit

Claims (1)

[Claims] 1. An electrodynamic speaker characterized in that the central part of the diaphragm protrudes rearward, the voice coil and magnetic circuit on the coil bobbin are placed in front of the center of the diaphragm, and the damper is placed behind the diaphragm. .