JPH0720316B2 - Woofer speaker - Google Patents

Description

TECHNICAL FIELD The present invention relates to a woofer speaker dedicated to heavy bass used in various general audio equipment and video equipment.

(Prior Art) Conventionally, a speaker exclusively for deep bass, in which a voice coil bobbin and a voice coil are provided at the center of a cone-shaped diaphragm, and a magnet constituting a magnetic circuit is disposed behind the voice coil is known.

(Problems to be Solved by the Invention) In a conventional speaker for heavy bass, in order to increase the amplitude of the cone-shaped diaphragm, not only is the cone-shaped diaphragm itself increased in depth, but also a magnet is used. There is a problem in that the size of the magnetic circuit section constituted by is also increased. Therefore, the speaker case also has a large depth, and a large space is required for a storage place, which is a problem that it cannot be mounted in a car, for example. Further, there is a problem that the cost is high due to the above structure, and it cannot be provided at a low cost.

In view of the above-mentioned problems of the conventional speaker, the present invention can be provided not only in a thin and ordinary room but also in a car, for example, in a space such as a ceiling or a back of a seat, and can be provided at low cost. It is intended to provide a woofer speaker dedicated to deep bass.

(Means for Solving the Problem) In order to achieve the above object, the woofer speaker of the present invention has a cone-shaped diaphragm having no hole in the center thereof along a circular portion substantially in the radial direction from the center thereof. The inner part of the diaphragm is folded back, the edge of the folded diaphragm is fixed to the speaker frame, and the reinforcing annular member is fixed to the folded circular portion of the diaphragm. A vibrating system for transmitting the driving force to the vibrating plate is connected to the vibrating plate.

The shape of the diaphragm is a cone that faces the front, and the folding direction of the inner portion along the circular portion approximately in the radial direction from the center of the diaphragm is the front side, and the center of the diaphragm is bulged toward the surface. Preferably there is.

The vibrating system is configured by vibrating arms provided with a driving unit including a yoke and a magnet at appropriate positions around the speaker frame, and vibrating by the driving unit and projecting the tip to the position of the reinforcing annular member of the diaphragm. However, it is desirable that the tip of the vibrating arm is connected to a part of the reinforced folded circular portion.

In addition, the wires of the plurality of biometal fibers are spread over the pair of columns that are erected at the edges of the speaker frame so that the intermediate portion is located on a part of the folded circular portion reinforced by the reinforcing annular member. Cross and stretch,
The above-mentioned vibration system is configured by the wires of these biometal fibers, and the middle part of the wires of this biometal fiber is connected to a part of the reinforced folded circular part. It is also possible to expand and contract to vibrate the diaphragm.

Further, a plurality of electromagnetic vibrating parts are provided at a plurality of positions of the speaker frame, and a wire is stretched between these electromagnetic vibrating parts to form the vibrating system, and the middle part of the wire is reinforced with a folded circular shape. It may be connected on a part of the portion, and the electromagnetic vibrating portion may be vibrated by the electric signal to vibrate the diaphragm.

(Example) An example will be described with reference to the drawings. 1 to 7 show a basic embodiment of the present invention. In the figure, reference numeral 1 denotes a diaphragm, which is a conventionally known cone-shaped diaphragm having no hole at its center, and its inner portion is folded back from the center along a circular portion substantially in the radial direction. Configured. The edge of the folded diaphragm 1 is fixed to the speaker frame 2. That is, as shown in FIG. 6, the edge of the diaphragm is clamped and fixed to the clamping portion 4 of the speaker frame 2. In the illustrated embodiment, the dome-shaped center of the folded diaphragm is positioned toward the front of the speaker, but the bulge may be reversed.

Reference numeral 5 in the figure is a reinforcing annular member fixed to the folded circular portion of the diaphragm. For example, a ring-shaped member made of hard paper, aluminum plate or synthetic resin plate is attached to the back side of the folded portion of the diaphragm. is there.

Reference numeral 6 in the drawing denotes a drive unit, which is provided at four corners of the speaker frame 2 in the illustrated embodiment. This drive unit does not have to be the four corners of the speaker frame 2, and may be two, three, or five at appropriate positions on the periphery. This drive unit is composed of a yoke 8 in which a center pole 7 is erected and a magnet 9 located around the center pole, like the drive unit of a known speaker. A shaft support member 11 is fixedly mounted on a top plate 10 of the yoke 8, and a base end of a vibrating arm 12 is supported by the shaft support member 13.

The drive arm 12 is provided with a cylinder 14 positioned on the center pole 7 of the drive unit 6 and corresponding to a voice coil bobbin of a known speaker.
Is provided.

The tip of the drive arm 12 is positioned so as to project to the position of the reinforcing annular member 5, and the tip of the drive arm is connected 16 to the folded portion reinforced by the reinforcing annular member.

Next, the embodiment shown in FIGS. 8 to 12 will be described.
In the figure, the parts designated by the same reference numerals as those in the embodiment shown in FIGS. 1 to 7 represent the same members. In this embodiment, a part different from the embodiment shown in FIGS. 1 to 7 is a vibration system for transmitting a driving force to the diaphragm, and the shape of the diaphragm 1 and its mounting structure to the speaker frame 2. There is no difference.

The most characteristic feature of this embodiment is that a known biometal fiber wire that expands and contracts when receiving an electric signal is used as a vibration system.
That is, as shown in FIGS. 9 and 12, two columns 21 are erected at each of the four corners on the back of the speaker frame 2 to form a pair with columns having opposite edges, and the columns forming this pair. 2
A bio-metal fiber wire 22 is stretched between 1 and 21. Moreover, the intermediate portion of the wire 22 is positioned on a part of the folded circular portion of the diaphragm 1 reinforced by the reinforcing annular member, and the wire 22 and the portion of the circular portion are connected 23. . The wires 22 are expanded and contracted by passing an audio electric signal through the respective wires, and the diaphragm 1 is vibrated by the vibration of this vibrating system. Further, as shown in FIG. 8 and FIG. 10, 24 in the figure is a leaf spring that is projected from the edge toward the center on the front surface of the speaker frame 2 and has a viscoelastic soft synthetic resin coating for preventing resonance. The wire 22 is stretched, and the wire is contracted by heating due to energization. The wire is stretched while it is not heated when the energization is stopped next time. The tip of the wire 22 faces the folded-back portion of the diaphragm 1 and is positioned. , Connected by a wire 25.

Further, in the embodiment shown in FIGS. 13 to 16, a normal metal wire 32 is used in place of the biometal fiber wire, and the wire is stretched between the electromagnetic drive parts 31 and 31. It consists of a vibration system. This electromagnetic drive unit is composed of a well-known pole piece 33, 33, which is constituted by a balance door armature 34 which is positioned between the electromagnets by always exerting a spring elastic force on one side to hold the electromagnet. The metal wire 32 is stretched between 34 and 34, and other points are the same as those of the embodiment shown in FIGS. 8 to 12.

The operation of the speaker of the present invention having the above structure will be described below.

In the embodiment shown in FIGS. 1 to 7, when an audio electric signal is passed through the drive unit 6, the voice coil is similar to a known speaker.
The vibration arm 12 is vibrated by the vibration of 15. Then, this vibration is transmitted to the folded portion of the diaphragm 1 which is connected to the tip of the arm 12, and vibrates the diaphragm 1 to emit a deep bass sound. In this configuration, the base of the vibrating arm vibrates, and the vibration is transmitted to the diaphragm at the tip of the vibrating arm. Even a slight vibration of the base causes a large vibration at the tip of the arm. It may be small, and therefore, the weight of the drive unit can be reduced.

Next, in the embodiment shown in FIGS. 8 to 12, when an audio electric signal is passed through the wire 22 of the biometal fiber, the wire 22 of the biometal fiber is expanded and contracted by the action of the leaf spring 24 by this electric signal. The vibrating plate 1 vibrates in response to this expansion and contraction action, and produces a deep bass sound. In this embodiment, since it is not necessary to use a magnet, a yoke, or the like that constitutes the driving unit, which is the main reason why the speaker becomes heavy, it is preferable that the speaker can be made extremely lightweight.

Further, in the embodiment shown in FIG. 13 to FIG. 16, a normal metal wire is used, and this wire is connected and stretched to a known electromagnetic vibrating section, and the diaphragm 1 is vibrated by the vibration of the electromagnetic vibrating section. It vibrates to generate sound.

(Effects of the Invention) As described above, in the woofer speaker of the present invention, a cone-shaped diaphragm having no hole in the center portion is formed by folding back the inner portion along a circular portion substantially in the radial direction from the center thereof. Since the reinforcing annular member is fixed to the folded portion and the vibration system for transmitting the driving force to the diaphragm is connected to the folded portion, the thickness of the diaphragm can be reduced to half that of the conventional speaker. In addition, since the driving unit can be made small and lightweight, it can be made significantly thinner than the conventional woofer speaker, and there is a great advantage that the weight can be reduced. Therefore, there is a great effect that it is possible to provide an epoch-making woofer speaker that can be easily installed in a space such as a ceiling of a car or a space behind a seat where it has been said that a heavy bass type woofer speaker cannot be installed. Moreover, since it is not necessary to use a large drive unit or the like, there is an effect that it can be provided at a relatively low cost.

[Brief description of drawings]

1 to 7 show basic examples of the present invention.
The figure is a slope view of the front side, FIG. 2 is a back side slope view, FIG. 3 is a front view thereof, FIG. 4 is a rear view thereof, FIG. 5 is a side view thereof, and FIG. Enlarged partial sectional view, No. 7
Similarly, the figure is a side view of the main part thereof. 8 to 12 show another embodiment of the present invention. FIG. 8 is a front view thereof, FIG. 9 is a rear view thereof, and FIG. 10 is a partial sectional view thereof.
Fig. 11 is a side view of it, and Fig. 12 is a rear view of it.
13 to 16 show still another embodiment of the present invention. FIG. 13 is its front view, FIG. 14 is its rear view, FIG. 15 is its partial sectional view, and FIG. It is the side view. 1 ... driving plate, 2 ... speaker frame 5 ... reinforcing ring member, 6 ... driving unit 16 ... connection 22 ... biometal fiber wire 31 ... electromagnetic driving unit, 32 ... metal wire

Claims (5)

[Claims] 1. A cone-shaped diaphragm having no hole at its center is formed by folding back an inner portion along a circular portion substantially in the radial direction from the center, and the edge of the folded-back diaphragm is a speaker frame. The reinforcing annular member is fixed to the folded circular portion of the diaphragm, and the vibration system for transmitting the driving force to the diaphragm is connected to the reinforced folded circular portion. Woofer speaker. 2. The vibrating plate is formed in a cone shape that faces the front, and the folding direction of the inner portion along a circular portion approximately in the radial direction from the center of the vibrating plate is the front side, and the center of the vibrating plate is directed to the surface. The woofer speaker according to claim 1, wherein the woofer speaker has a bulged shape. 3. A drive unit including a yoke and a magnet is provided at each of appropriate positions around the speaker frame, and the drive unit vibrates and the tip is extended to the position of the reinforcing annular member of the diaphragm. 2. The woofer speaker according to claim 1, wherein a oscillating system is constituted, and a tip of the oscillating arm is connected to a part of a reinforced folded circular portion. 4. A plurality of biometals extending between pairs of stanchions that are erected at the edges of the speaker frame such that the intermediate portion is located on a part of the folded circular portion reinforced by the reinforcing annular member. The wires of the fiber are stretched to cross each other, and the vibration system is constituted by the wires of the biometal fiber, and the middle part of the wire of the biometal fiber is connected to a part of the reinforced folded circular part. The woofer speaker according to claim 1, wherein the wire of the biometal fiber is expanded and contracted by an electric signal to vibrate the diaphragm. 5. A speaker frame is provided with electromagnetic vibrating portions, each of which is paired with each other, and a wire is stretched between these electromagnetic vibrating portions to form the vibrating system. The intermediate portion of the wire is reinforced. The woofer speaker according to claim 1, wherein the woofer speaker is connected to a part of the folded circular portion, and the electromagnetic vibrating portion is vibrated by an electric signal to vibrate the diaphragm.