JPS5818383Y2 - Denki Onkiyou Henkanki - Google Patents

Description

[Detailed explanation of the invention] This invention involves mounting the entire unit on a wall made of a material, such as a plywood board, that can be elastically deformed relatively easily by an external force perpendicular to the wall, and electrically connecting the wall. The present invention relates to an improvement in an electroacoustic transducer that radiates sound waves from the wall surface by vibrating in response to an input.

Conventional electroacoustic transducers of this type are used, for example, on the ceiling of a house,
It is attached to the floor, wall, or the back of a frame with a photo, poster, etc. pasted on it, and is used to radiate sound waves from the wall by vibrating the mounting surface.

That is, in Fig. 1, 1 is the wall surface to which the entire unit is attached, and as mentioned above, this is made of a material, such as a so-called plywood board, that can be elastically deformed relatively easily by an external force in a direction perpendicular to that surface. Preferably.

2 is an annular plate, 3 is an annular magnet, and 4 is an annular yoke with a cross-sectional shape;
The magnet 3 and yoke 4 are each attached integrally,
It constitutes a magnetic circuit.

5 is a sleeve passing through the center of the yoke 4, 6 is a first damper installed between the plate 2 and the base of the sleeve 50, and γ is installed between the yoke 4 and the end of the sleeve 5. The second damper 8 is a bobbin with one end attached to the base of the sleeve 50 and the other end facing the magnetic gap formed between the plate 2 and the yoke 4. A voice coil 9 is wound around the portion.

The entire unit described above is attached to the wall surface 1 with a single wood screw 10 passing through the center of the sleeve 5.

Therefore, when electrical audio input is applied to the voice coil 9, relative vibrations occur between the magnetic circuit consisting of the plate 2, magnet 3, and yoke 4 and the coil 9 due to the electromagnetic force caused by the audio current. It turns out.

Here, since the magnetic circuit component consisting of the plate, magnet, and yoke has a relatively large mass, it has a large static inertia. Therefore, when a relative vibrational motion occurs between the magnetic circuit component and the voice coil 9, As a reaction, the voice coil 9 side is vibrated, and the vibration action of the voice coil 9 side acts on the wall surface 1 side via the bobbin 8 and sleeve 5, and moves the wall surface 1 in the left-right direction in FIG. This results in vibration.

Therefore, the wall surface 1 vibrates in the left-right direction in FIG. 1 in response to the input audio current, and audio waves are radiated from the wall surface 1.

However, in conventional devices of this kind, the only surface from which sound waves are radiated is the wall surface on which the entire unit is attached, so the tone reproduced may depend on the material of the wall surface, or the high frequency range may be emitted from a large area of the mounting surface. Therefore, there are unavoidable disadvantages such as poor directivity characteristics in the high frequency range.

This idea aims to eliminate the above-mentioned disadvantages of the conventional ones, and by installing a diaphragm in a part of the unit and mainly reproducing high-pitched sounds by the diaphragm, it is possible to reproduce high-pitched sounds. The object of the present invention is to provide an electroacoustic transducer that can reproduce high-frequency sounds with good directional characteristics while making up for the deficiencies.

An embodiment of this invention will be described below with reference to FIG.

That is, in FIG. 2, 20 indicates a cabinet formed in a substantially cylindrical shape, and inside this cabinet 20,
A yoke 17 that is annular and has an inner surface that stands up in a cross-sectional shape, an annular magnet 18 that is fixed concentrically to the flange of this yoke 11, and the above-mentioned yoke that is fixed concentrically to this annular magnet 18. A magnetic circuit structure is attached to the annular plate 19, which forms a magnetic gap with the outer circumferential surface of the L-shaped rising portion of the yoke 11.

The outer peripheral end of a disc-shaped first damper 24 provided with corrugations in the circumferential direction is mounted on the plate 19, and a cylindrical bobbin 15 is fixed to the inner peripheral end thereof. ing.

A voice coil 16 is wound around the outer peripheral surface of the bobbin 15, and the voice coil 16 is movable by the first damper 24 so as to face the magnetic gap formed between the plate 19 and the yoke 17. Possibly supported.

Reference numeral 22 denotes a cone-shaped diaphragm, whose central inner peripheral end is connected to the end of the bobbin 15, and whose outer peripheral end is attached to the cabinet 20 via an edge 23. In order to be able to vibrate in the left and right directions in Figure 1,
It is supported by this edge 23 and the first damper 24.

Reference numeral 12 denotes a support rod made of metal such as aluminum and having a T-shaped cross section. This support rod 12 passes through the center of the yoke and is attached to the wall surface 11 with wood screws 13 at its base.

Reference numeral 21 denotes a second disc-shaped damper with co-regation in the circumferential direction, the outer peripheral end of which is fixed to the cabinet 20, and the inner peripheral end of which is fixed to the support rod 12. The cabinet 20 and the magnetic circuit component are supported so as to be movable in the axial direction of the support rod 12.

Reference numeral 14 denotes an elastic body formed in a disc shape from a rubber material, the outer circumferential end of which is fixed to the inner circumferential surface of the bobbin 15,
Further, its inner circumferential end is fixed to the outer circumference of the tip of the support rod 12.

In the electroacoustic transducer of this invention, which adheres to the above configuration,
The cabinet 20 and the yoke 1 attached to it
Since the magnetic circuit component consisting of the T, magnet 18, and plate 19 has a relatively large total weight, its static inertia is also large.

Therefore, when a voice current is applied to the voice coil 16,
A vibration action is generated in the heis coil 16 in the left-right direction in FIG. 2 in response to the audio current.

Here, the inner peripheral end of a cone-shaped diaphragm 22 is attached to the end of the bobbin 15, so that the diaphragm 22 is vibrated by the vibration of the voice coil 16.

Further, an elastic body 14 is attached to the inner circumferential surface of the bobbin 15, and this elastic body 14 is further attached to the support rod 12, so that the support rod 12 is provided with a signal from the voice coil 16 via the elastic body 14. Vibration is transmitted.

Therefore, the vibration from the voice coil 16 is transmitted to the wall surface 11 via the support rod 12,
If the wall surface 11 is easily elastically deformed, the wall surface 11 will be vibrated in the left-right direction in FIG. 2, and sound waves will be emitted from the wall surface 11.

Here, the elastic body 14 stops transmitting vibrations as the frequency increases.

In other words, since it acts as a low-pass filter, when a high-frequency audio signal is applied to the voice coil 16, only the cone-shaped diaphragm 22 vibrates, and the diaphragm 22 radiates high-frequency signals. become.

Since this device is constructed as described above, the mounting wall surface is also vibrated in the low frequency range, so it is possible to reproduce the low frequency sound that can be obtained from a large aperture.In addition, in the high frequency range, the cone-shaped Since the diaphragm is vibrated, it compensates for the lack of high frequency range, and since the high frequency range is radiated from the cone-shaped diaphragm with a small diameter, the installation with a wide vibration area has a better direction than the conventional one that radiates from the wall surface. Practical effects such as being able to reproduce high-pitched sounds with good characteristics at a good time can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the conventional device, and FIG. 2 is a sectional view showing an embodiment of the invention. 11... Wall surface, 12... Support rod, 13
...Wood screw, 14...Elastic body, 15...
...Bobbin, 16...Voice coil, 17
...Yoke, 18...Magnet, 1
9... Plate, 20... Cabinet, 21... Damper, 22... Vibration plate, 23... Edge, 24... ...damper.

Claims (1)

[Scope of utility model registration request] A magnetic circuit that is installed in the cabinet 20 and includes a yoke 17 having an annular cross-sectional shape, an annular magnet 18, and an annular plate 19, and a magnetic gap is formed between the yoke and the plate. a construct and
A first damper having one end attached to a part of the magnetic circuit structure, a bobbin 15 attached to the other end, and supporting a voice coil 16 wound around the bobbin so as to be positioned within the magnetic gap. 24, the bobbin 15 is attached to the central inner peripheral end thereof, and the outer peripheral end thereof is attached to the edge 23.
A diaphragm 2 attached to the cabinet 20 via
2, a support rod 12 whose base is attached to the wall surface 11 and passes through the center of the yoke, one end of which is attached to this support rod 12, and the other end is attached to the cabinet 20 and is connected to the support rod 12. On the other hand, a second damper 21 supports the cabinet 20, one end is attached to the tip of the support rod 12, and the other end is attached to the bobbin 15 to transmit vibrations of the bobbin 15 to the support rod 12. The vibration motion of the voice coil 16 relative to the magnetic circuit component is transmitted to the diaphragm 22 to cause the diaphragm 22 to vibrate, and the vibration motion is transmitted to the elastic body 14 and the support rod. The electroacoustic transducer is configured such that the mounting of the support rod 12 transmits the vibration to the wall surface 11 via the support rod 12, thereby causing the wall surface 11 to vibrate.