JPH11275688A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thin, high-performance loudspeaker. SOLUTION: A curved-surface plate 2 having a curved surface in one- dimensional direction with its convex surface on the front side is supported by a support section, a part of which is incorporated in a frame body 1. On the rear concave surface of the curved-surface plate 2, a plurality of ribs 4 made of the same material as that of the plate 2 is provided, and a voice coil is arranged between the ribs 4 and fixed to the rear surface of the plate 2 with an adhesive via a short cylindrical hard connecting member. On the rear side of the voice coil, a yoke 8 and a permanent magnet are arranged separately and fixed to a frame 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker which can be suitably used for thin speakers for various uses.

[0002]

2. Description of the Related Art Hitherto, a commonly used speaker is a cone-shaped dynamic speaker, which reproduces sound by vibrating air using cone paper.

[0003]

However, this dynamic speaker has a large thickness because a horn-shaped cone paper also fixed to the frame must be attached via a cap in front of the voice coil fixed to the frame. I have to be.

In order to output a loud sound, the cone paper must be vibrated greatly. For this purpose, a damper, which is an elastic member, is interposed between the voice coil and the cone paper, and the sound is transmitted through the damper. There is also a problem that the transmitted sound is modulated.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a speaker that is thin, hardly modulates, and faithfully reproduces sound.

[0006]

According to the present invention, there is provided a speaker according to the present invention, wherein a rib is formed on a back surface of a curved plate having a bulging surface facing forward, and a voice coil is fixed to the back surface. Features.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. 1 is a perspective view as viewed from the front, FIG. 2 is a perspective view as viewed from the rear, and FIG. 3 is a cross-sectional view. Reference numeral 1 denotes a frame of the speaker, which is made of, for example, wood and has a side of 150 mm and a thickness of
A curved plate 2 made of a thin plate of wood, synthetic resin or the like having a bulging surface facing forward and having a curved surface in a one-dimensional direction, and a part of which is formed in the frame 1, The curved plate 2 is supported without being fixed to the frame 1, being in contact with the provided support portion 3. For example, a plurality of ribs 4 of the same material as the curved plate 2 are provided on the concave back surface of the curved plate 2, and a voice coil 5 is arranged between the ribs 4. Is fixed by an adhesive via a hard connection member 6 having a short cylindrical shape. A frame 7 is provided at a rear portion of the frame 1, and a yoke 8 and a permanent magnet (not shown) provided in the yoke 8 are attached to the frame 7, and the frame 7 is electromagnetically separated from the voice coil 5. Is joined to.
If necessary, a speaker cloth may be provided on the front surface of the frame 1.

In this case, if the voice coil 5 is arranged between the ribs 4 as in the embodiment and is accommodated in the concave portion of the curved plate 2, the thickness of the frame 1 is made substantially equal to these thicknesses. Thus, an extremely thin loudspeaker obtained by adding the thickness of the curved plate 2 to the thickness of the voice coil 5 can be obtained. The rib 4 maintains the shape of the curved plate 2 and plays a role of inducing a wave motion in the curved plate 2 and can be stretched in any direction.

Here, when an audio current is applied to the voice coil 5, vibration corresponding to the audio is generated in the voice coil 5 by an electromagnetic action with the yoke 8 which allows the magnetic flux from the permanent magnet to flow.
This vibration is transmitted to the curved plate 2 via the connection member 6.
Since the curved plate 2 is reinforced by the ribs 4, the curved plate 2
Is suppressed, and most of the sound energy is transmitted to the curved plate 2 as a wave. The wave causes collision between molecules in the curved plate 2 and is converted into a sound, and a sound whose sound pressure level is increased from the curved plate 2 is emitted from the curved plate 2. In this case, the sound is not pushed out by the vibration of the curved plate 2, that is, the vibration, so that the sound is transmitted in all directions without any particular directivity.

Further, since a conventional damper is not used between the voice coil 5 and the curved plate 2 so as to easily support the cone paper, unlike the conventional speaker, the voice is not modulated by the expansion and contraction of the damper. Can be faithfully reproduced.

In this case, it has been confirmed that when the curvature of the curved plate 2 is changed, the collision rate between molecules changes and the sound pressure level changes. However, the size of the curved plate 2 is taken into consideration. Preferably, the curvature is appropriately selected. In the embodiment, the curved plate 2 is bent in a one-dimensional direction. However, the curved plate 2 may be expanded in a two-dimensional direction, that is, a spherical shape.

The voice coil 5 can be mounted at an arbitrary position on the back surface of the curved plate 2 as long as the thickness of the speaker does not increase. Further, the connection member 6 is not limited to the means of the embodiment.

Further, the frame 7 can be omitted, and the yoke 8 and the permanent magnet can be integrated with the voice coil 5. By doing so, the vibration generated in the voice coil 5 is reduced, but the wave is generated. Since the sound is transmitted to the curved surface plate 2, sound can be generated efficiently.

[0014]

As described above, the loudspeaker according to the present invention is extremely thin, almost the thickness of the voice coil, and can be manufactured at low cost and has good performance.

[Brief description of the drawings]

FIG. 1 is a perspective view seen from the front.

FIG. 2 is a perspective view seen from the rear.

FIG. 3 is a sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Curved board 3 Support part 4 Rib 5 Voice coil 6 Connection member 7 Frame 8 Yoke

Claims (5)

[Claims] 1. A speaker, wherein a rib is formed on a back surface of a curved plate with a bulging surface facing forward, and a voice coil is fixed to the back surface. 2. The speaker according to claim 1, wherein the rib is arranged at a position where a wave inputted from the voice coil to the curved plate is easily transmitted along the curved plate. 3. The speaker according to claim 1, wherein the voice coil is fixed to the curved plate via a short cylindrical connecting member. 4. The speaker according to claim 1, wherein a yoke and a permanent magnet are spaced apart behind the voice coil. 5. The speaker according to claim 1, wherein a yoke and a permanent magnet are fixed to the voice coil.