JPS63275298A - Speaker device - Google Patents

Abstract

PURPOSE:To eliminate the deterioration of a linearity during the long period amplitude of a diaphragm by providing an even flexible characteristic throughout all periphery in a speaker edge and forming a sectional form so as to constantly support a diaphragm by tension at the time of the amplitude of the diaphragm. CONSTITUTION:The speaker edge 1 is formed by a fiber or the like so as to have the extremely even flexible characteristic throughout all the periphery under a neutral position in which force by the diaphragm 2 is not applied to fix both end parts 1a, 1b, the diaphragm 2 and the external periphery part of a frame by an adhesion or the like. Accordingly, even at the time of the large amplitude of the diaphragm 2, the edge 1 supports the diaphragm 2 through all the periphery by the equal tension and the diaphragm 2 of the amplitude or the like is correctly displaced only in the direction of the speaker axis 8. Thereby, a reproduced sound having no distortion and excellent in the linearity can be radiated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a speaker device used in a sound reproduction device, and particularly to a diaphragm support device that allows amplitude operation to vary linearly. .

[Prior Art] In conventional speaker devices, cloth, foamed polyethylene, or the like is formed into a roll or wave shape, and these are provided as the speaker edge and damper of a diaphragm to support the diaphragm that vibrates as audio output. .

FIGS. 3(a) and 3(b) are a front view and a sectional view showing one side from the center of an example of this type of speaker device. In the figure, (1) represents the diaphragm (2) and the frame (3).
), the speaker edge is formed from a highly flexible material such as cloth and supports the diaphragm (2), and (4) is the same as the diaphragm (1). The damper is made of a highly flexible material and supports the lower part of the diaphragm (2), (5) is the voice coil into which the audio signal is input, and (6) is the audio signal of this voice coil (5). A magnetic circuit section that converts audio signals into magnetic energy using electric current (
7) is a voice coil bobbin around which the voice coil (5) is wound.

In addition, in order to improve nonlinear distortion caused by amplitude operation in ordinary speaker devices, for example, Japanese Patent Laid-Open No. 57-2108
A device that has a wide amplitude linearity region to reduce distortion and supports strong resistance against forces in the direction of lateral displacement of a diaphragm or voice coil, as disclosed in Japanese Patent No. 00, or Japanese Patent Application Laid-Open No. As disclosed in Japanese Patent Publication No. 60-68799, it has at least two roll parts with different radii of curvature and a connecting part connecting these parts, and has an edge that expands and contracts in the circumferential direction due to stress deformation of this connecting part. There are devices that support the diaphragm.

Next, the operation will be explained based on FIG. 3 above.

When an audio signal current is input to the voice coil (5), this signal current is converted into magnetic energy in the magnetic circuit section (6), and the action of this magnetic energy causes the audio signal current to flow through the voice coil bobbin (7). An amplitude is generated in the axial direction of the diaphragm (1), and audio waves are output in the axial direction to radiate reproduced sound. This diaphragm (1
), the speaker edge (1) and damper (4) are fixed at the circumference of the diaphragm (2) and frame (3) so that the linearity of the amplitude in the axial direction with respect to the audio signal current does not deteriorate. This restricts the movement of the diaphragm (2) in the direction perpendicular to the axis (hereinafter referred to as the lateral direction).

[Problems to be Solved by the Invention] In the conventional speaker device as described above, the speaker edge (1) and the damper (
4) continues to support the diaphragm (1) for a long time,
If the balance of axial flexibility is partially lost due to non-uniformity of the material, and a lateral component force due to the amplitude of the diaphragm (1) begins to act, The linearity of the audio wave in the axial direction with respect to the audio signal current deteriorates, causing distortion in the reproduced sound.

Furthermore, even with the device disclosed in Japanese Patent Application Laid-open No. 57-210800, which was developed as a measure to prevent distortion of the reproduced sound, there is non-uniformity in both the axial and lateral directions, and the forming of the edge member is difficult. This results in high costs. Furthermore, the device disclosed in Japanese Patent Application Laid-Open No. 60-68799 has problems such as non-uniform characteristics in the lateral direction.

This invention was made to solve the above-mentioned problems, and even if the diaphragm is used with vibration for a long period of time, there is almost no deterioration in the linearity of the axial movement, and it has good elasticity in the lateral direction. It is an object of the present invention to provide a speaker device equipped with a support device for a diaphragm that can maintain a diaphragm in a uniform state over its entire circumference.

[Means for Solving the Problems] A speaker device according to the present invention is provided with a support device that fixes both ends of a speaker edge to a diaphragm and an outer peripheral portion of a frame, in which the speaker edge is fixed to the diaphragm and the outer periphery of the frame. The diaphragm is formed into a cross-sectional shape that has uniform flexibility and always supports the diaphragm by a tensile force when the diaphragm vibrates.

[Function] Since the diaphragm according to the present invention is supported by a tensile force due to uniform flexibility over the entire circumference during amplitude, the diaphragm correctly oscillates only in the axial direction of the speaker.

[Embodiment] Fig. 1 is a cross-sectional view showing the displacement state of the edge portion due to the amplitude change of the diaphragm in a speaker device according to an embodiment of the present invention, and (1), (2), and (3) are the conventional example. The same or corresponding parts are shown with the same reference numerals in FIG. In addition, (a) shows the state when the diaphragm = 4 - (2) is oscillated and moves to the front of the sound radiation, and (b) and (C) similarly show the state at the neutral position and when it moves to the back of the sound radiation. The status of each is shown.

The speaker edge (1) has a cross-sectional shape in figure (b), which shows the neutral state where no force is applied by the diaphragm (2). etc., both ends (la),
(lb) and the outer periphery of the diaphragm (2) and frame (3) are fixed.

In the speaker device according to the present invention configured as described above, the amplitude of the diaphragm (2) increases as the amplitude of the diaphragm (2) increases.
) and the speaker edge (
1) is the midpoint P between the speaker axis (8) and the speaker edge (1) as shown in Fig. 1 (a), (b), and (c).
, P , P and the respective distances (radius) a
By varying b cr ra, r, , r , in this case, (a
) and (C), the speaker edge (1) at the front or rear drive position of the diaphragm (2).
) The cross section of the speaker edge (1) is deformed such that the cross-sectional curvature radii R and R2 of the speaker edge (1) become larger.

In addition, since the speaker edge (1) has extremely uniform flexibility around the speaker axis (8), even when the diaphragm (2) has a large amplitude, the edge (1) can be attached to the diaphragm (2) over the entire circumference. 2) is supported with uniform tensile force. As a result, the diaphragm (2) is correctly displaced only in the direction of the speaker axis (8) during amplitude, so that reproduced sound with excellent linearity and no distortion can be emitted.

[Effects of the Invention] As explained above, in this invention, a speaker edge having uniform flexibility is fixed to the outer circumference of a diaphragm, and when the diaphragm is vibrating, the speaker edge is uniform over the entire circumference of the diaphragm. Since it is configured to be supported by tensile force, the diaphragm is displaced only in the axial direction of the speaker even when the amplitude is large, so that reproduced sound with excellent linearity can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of a speaker device according to an embodiment of the present invention and the displacement of the diaphragm and the speaker edge during vibration, and Fig. 2 (a) and (b) are examples of the configuration of a normal speaker device. FIG. In the figure, (1) is the speaker edge, (2) is the diaphragm, and (3) is the frame. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A support device is provided in which both ends of the speaker edge are fixed to the diaphragm and the outer periphery of the frame, respectively, and the speaker edge has uniform flexibility over the entire circumference and is always subjected to tensile force when the diaphragm vibrates. A speaker device characterized in that the speaker device is formed into a cross-sectional shape that supports the diaphragm.