JPH06225385A - Dome-like vibrator for speaker - Google Patents

Abstract

PURPOSE:To prevent the decline of a reproducing band while dissolving high tone resonance, to improve speaker characteristics and to improve tone by forming a continuous rugged surface for which a cross-sectional shape continues in a circumferential direction and from a peak part to a peripheral direction. CONSTITUTION:This dome-like vibrator 1 is formed by a dome part 2, a ring- like edge part 3 and a fixed part 4. Then, for the dome part 2, the L-shaped cross-sectional shape continues in the circumferential direction, also projecting and recessing parts forming an L shape continue from the peak part in the peripheral direction T and a step-like continuous uneven surface 5 is formed as a whole. By the constitution, since the rigidity of the vibrator 1 becomes flexible and the vibrator 1 easily moves in the vibrating direction of a dome and hardly moves in a cross direction, sound pressure frequency characteristics are flattened, the high tone resonance can be dissolved without lowering the reproducing band of high tone, the characteristics of the speaker is improved and the tone can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dome-shaped vibrating body used for a speaker such as a dome-shaped vibrating plate and a dust cap.

[0002]

2. Description of the Related Art Conventionally, for example, a dome-shaped diaphragm in a dome-shaped speaker is generally known as a dome-shaped vibrating body for a speaker of this type. The dome-shaped diaphragm has a hemispherical dome portion and an edge portion which is continuously formed on the periphery of the dome portion and is formed to extend radially outward. A voice coil is coupled to the lower surface of the periphery of the dome portion. ing. The voice coil is a pole standing on the yoke,
It is placed in a narrow ring-shaped space formed between the plate fixed to the yoke via a magnet,
This gap forms a magnetic circuit with the yoke, magnet, plate and pole.

When a current flows through the wire of the voice coil, an electromagnetic force acts on the wire to generate a driving force.
This driving force changes in proportion to the strength of the current, which causes the voice coil to vibrate in the axial direction of the pole. The vibration of the voice coil vibrates the dome-shaped vibrating body integrated with the voice coil, and the sound is emitted from the dome portion.

The dome-shaped speaker using the dome-shaped diaphragm is liable to have a high-pitched sound side due to its structure, and is therefore mainly used as a mid-range and high-pitched speaker.

[0005]

However, in the dome-shaped speaker using such a conventional dome-shaped diaphragm, the one having a hard diaphragm has a peak (treble resonance frequency) peculiar to the treble range. , This high-frequency resonance adversely affected the characteristics of the speaker and caused deterioration of sound quality.

Therefore, in order to eliminate these sound quality deterioration and the like, conventionally, a dome-shaped speaker having a soft diaphragm has come to be provided, and it has become possible to eliminate the peculiar treble resonance in the treble range. As a reaction, there is a problem that the reproduction band in the high frequency range is lowered and the sound quality is inevitable.

The present invention has been made in view of such conventional problems, and an object of the present invention is to solve the above problems by dispersing resonance frequencies in a high frequency range to eliminate high frequency resonance.

[0008]

In order to solve the above-mentioned problems and the like and to achieve the above-mentioned object, the present invention is a continuous dome-shaped vibrating body whose cross-sectional shape is continuous in the circumferential direction and from the top to the peripheral direction. It is characterized in that a concave-convex surface is formed.

As the dome-shaped vibrating body, a dome-shaped vibrating plate, a dust cap or the like can be applied.

The continuous uneven surface can be formed concentrically or spirally.

[0011]

According to the present invention, since the dome-shaped vibrating member has a flexible structure and is easy to move in the vibration direction of the dome and hard to move in a direction intersecting with the dome-shaped vibrating member, the present invention produces a high-pitched sound which is peculiar to a high range. It is possible to improve the sound quality by eliminating the resonance while preventing the reproduction band from being lowered and improving the speaker characteristics.

By improving the dome-shaped diaphragm or the dust cap, it is possible to improve speaker characteristics and sound quality.

The dome-shaped vibrating body can be made flexible by the continuous uneven surface formed in a spiral shape or a concentric shape.

[0014]

EXAMPLE A first example of a dome-shaped vibrating body for a speaker to which the present invention is applied will be described below with reference to FIGS. 1 to 3 and 6.

1 and 2 shows a dome-shaped diaphragm which is a specific example of the dome-shaped vibrating body. The dome-shaped diaphragm 1 includes a dome portion 2 formed in a hemispherical shape, and a dome portion 2. A ring-shaped edge portion 3 that is continuous with the periphery of the dome portion 2
And a ring-shaped fixing portion 4 continuous to the outer peripheral edge of the edge portion 3. The dome portion 2 has a continuous L-shaped cross-sectional shape in the circumferential direction S, and the L-shaped irregularities are continuous from the top to the peripheral direction T, whereby a stepwise shape is formed as a whole. A continuous uneven surface 5 is formed.

The continuous concave-convex surface 5 of the dome portion 2 has a bellows-like characteristic. By providing the continuous concave-convex surface 5, the dome portion 2 vibrates in a direction of vibration (a direction perpendicular to the paper surface in FIG. 2). ) Is easy to move and is hard to move in directions other than the vibration direction. In this way, the dome part 2
By providing the continuous concave-convex surface 5 on the dome portion, the natural frequency of the dome portion 2 in the high-frequency band can be dispersed, and the occurrence of natural high-tone resonance can be prevented.

FIG. 3 is a test graph for explaining the above-mentioned state. In the conventional dome-shaped speaker, high-frequency resonance occurs near a frequency of 20 kHz as shown by a broken line in FIG. With such a configuration, as shown by the solid line in the figure, the natural frequency near the frequency of 20 kHz is dispersed, high frequency resonance is not generated, and good speaker characteristics can be obtained.

The edge portion 3 has an arc-shaped cross section, and the edge portion 3 also serves as a damper. A voice coil 10 is coupled to the end surface where the edge portion 3 and the dome portion 2 are coupled, as shown in FIG. By fixing the fixing portion 4 formed on the outer side of the edge portion 3 to the plate 14, the dome-shaped diaphragm 1 is assembled to the speaker unit.

The material of the dome-shaped diaphragm 1 can be widely realized from a soft material such as paper or cloth coated with a dump material to a hard material such as a metal foil such as titanium and beryllium. When it was applied to a diaphragm using biocellulose, good results as shown in FIG. 3 were obtained.

FIG. 6 shows a dome-shaped diaphragm 1 according to this embodiment.
It is a figure which shows the dome type speaker unit with which was attached, 11 is a yoke in the figure, 12 is a pole, 13 is a magnet.

Thus, according to the dome-shaped diaphragm 1 of this embodiment, a continuous uneven surface 5 having a continuous cross-sectional shape in the circumferential direction S and from the top to the peripheral direction T is formed on the entire diaphragm. Due to the provision of the continuous concave-convex surface 5, the dome has a shape that is easy to move in the vibration direction and hard to move in the direction intersecting with it. This makes it possible to flatten the sound pressure frequency characteristics in the high frequency range, eliminate the high frequency resonance without lowering the high frequency reproduction band, improve the characteristics of the speaker, and prevent the deterioration of the sound quality.

4 and 5 show another embodiment of the present invention. In the second embodiment shown in FIG. 4, the continuous uneven surface 7 of the dome-shaped diaphragm 6 is formed by a continuous arc. In addition, the third embodiment shown in FIG.
The continuous uneven surface 9 is formed by continuous triangular teeth. The other structure is the same as that of the above-described embodiment, and by forming the continuous uneven surfaces 7 and 9 in such a shape, the same effect as that of the above-described embodiment can be obtained.

The dome-shaped diaphragms 1, 6 and 8 are
Any of them can be manufactured by various manufacturing methods as in the conventional case, but in particular, in these examples, the shape is formed so that injection molding or the like can be performed by using a split mold member. That is, after injection molding, the shapes of the inner and outer surfaces of each continuous uneven surface 5, 7, 9 are formed so that the dome-shaped diaphragms 1, 6, 8 can be easily die-cut from both mold members. The peripheral edge side is expanded or at least has the same diameter so as not to enter the dome center side.

The present invention is not limited to the dome-shaped speaker as described in the above embodiment, but is not shown in the drawings.
The present invention can also be applied to other types of speakers such as a dust cap of a cone type speaker or a diaphragm used in a driver unit of a horn type speaker. The dust cap of the cone-shaped speaker is provided so as to close the hole formed in the center of the cone-shaped diaphragm, and sound is emitted by the vibration of the dust cap. Therefore, by forming the shape of the dust cap like the continuous concave-convex surfaces 5, 7, 9 of the dome-shaped diaphragms 1, 6, 8, it is possible to improve the characteristics of the speaker as in the above-described embodiment. The sound quality can be improved.

As described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, ring-shaped uneven surfaces having different diameters are arranged concentrically to form a continuous uneven surface 5. Although the example in which the concave-convex surface is formed is described, it is needless to say that the concave-convex surface can be a continuous concave-convex surface continuous in a spiral shape. As described above, the present invention can be variously modified without departing from the spirit thereof.

[0026]

As described above, according to the dome-shaped vibrating body of the speaker according to the present invention, the continuous unevenness having a continuous cross-sectional shape formed in the dome-shaped vibrating body in the circumferential direction and from the top to the peripheral direction is provided. The surface makes it easy to move in the vibration direction of the dome-shaped vibrating body and hard to move in the direction intersecting with it, so that the sound pressure frequency characteristics in the high range are flattened, and high-frequency resonance is achieved without lowering the high-frequency reproduction band. Therefore, it is possible to provide the effect that the dome-shaped vibrating body of the speaker that can improve the characteristics of the speaker and improve the sound quality can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a graph showing characteristics of the dome-shaped diaphragm of FIG.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the present invention.

6 is a cross-sectional view showing a dome-type speaker unit using the dome-shaped diaphragm of FIG.

[Explanation of symbols]

 1, 6, 8 Dome diaphragm 2 Dome part 3 Edge part 4 Fixed part 5, 7, 9 Continuous uneven surface S Circumferential direction T Peripheral direction from top

Claims (5)

[Claims] 1. A dome-shaped vibrating body for a speaker, characterized in that the dome-shaped vibrating body is formed with a continuous uneven surface having a continuous cross-sectional shape in the circumferential direction and from the top to the peripheral direction. 2. The speaker dome-shaped vibrating body according to claim 1, wherein the dome-shaped vibrating body is a dome-shaped vibrating plate. 3. The dome-shaped vibrating body for a speaker according to claim 1, wherein the dome-shaped vibrating body is a dust cap. 4. The dome-shaped vibrating body for a speaker according to claim 1, wherein the continuous uneven surface is formed concentrically. 5. The speaker dome-shaped vibrating body according to claim 1, wherein the continuous uneven surface is formed in a spiral shape.