JP3905814B2 - Speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker for audio equipment.
[0002]
[Prior art]
There are various types of speakers. Of these, as shown in, for example, Japanese Patent Publication No. 44-23783 and Japanese Examined Publication No. 62-21479, a rectangular planar shape that can be reproduced to a high frequency with a simple configuration. There is a speaker provided with a diaphragm.
[0003]
FIG. 8 shows a front view of the conventional example. In the figure, 1 'is a planar diaphragm, 2' is a driver provided at the position of the node of the planar diaphragm 1 ', and the planar diaphragm 1' is a multipoint drive system using a plurality of drivers 2 '. It has become.
[0004]
In a speaker having a flat diaphragm, the diaphragm 1 'is made to vibrate by having a honeycomb structure or the like in order to give the rigidity to the diaphragm 1'. However, since the shape rigidity is constant, the frequency varies depending on the structure, but it is specified in the primary vibration. A node is generated in the diaphragm at the frequency of, and the band of the diaphragm 1 ′ is oscillated integrally, and the frequency characteristic can be dip.
[0005]
In order to improve this, as shown in FIG. 8, a driver 2 'is attached to the node portion so as to perform multipoint driving.
[0006]
FIG. 9 shows an example of the configuration of a driver 2 'for multipoint driving. 10' is a yoke, 11 'is a pole piece, 12' is a magnet, 13 'is a magnetic circuit made of these members, and 14' is a vibration at the tip. A voice coil 15 'connected to the back surface of the plate 1' is a damper having one end coupled to the voice coil 14 'and the other end attached to the frame 16'.
[0007]
Further, in addition to the driver 2 'having such a configuration, as shown in Japanese Examined Patent Publication No. 57-65094, the frequency is flattened by attaching a weight to balance the diaphragm.
[0008]
[Problems to be solved by the invention]
As described above, in a speaker using a conventional flat diaphragm, a plurality of drivers 2 'are attached or weighted so as to be driven at multiple points, so that the manufacturing is complicated and the cost increases. There was a problem.
[0009]
Further, as shown in FIG. 7B, there is a problem that a large dip occurs and the sound quality is not good in the middle sound range. That is, in the conventional example using a flat plate-like baffle, the sound on the rear surface goes to the front depending on the length, and the phase shift is reversed, so a dip occurs due to the relationship between the length of the baffle and the wavelength of the sound, and good sound quality is achieved. Couldn't get.
[0010]
The present invention has been proposed in view of the above, and an object of the present invention is to be able to obtain excellent frequency characteristics with a single driver, and to achieve good sound quality and downsizing. Is to provide a simple speaker.
[0011]
[Means for Solving the Problems]
In the present invention, in a speaker having a rectangular diaphragm 1, the diaphragm 1 is curved along its length direction, and both ends thereof are supported while being further pressed in a bending direction via a pressing means, In addition, the above-described object is achieved by adopting a configuration in which the driver 2 is attached and driven at substantially the center of the diaphragm 1.
[0012]
The diaphragm 1 has a honeycomb structure, and the pressurizing means is made of a cushioning material 5 such as rubber or urethane foam or a spring.
[0013]
Further, the driver 2 has a moving magnet structure.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
[0015]
【Example】
FIG. 1 shows the configuration of the main part of one embodiment of the present invention. FIG. 2 shows a perspective view of the diaphragm of the present invention. In the figure, reference numeral 1 denotes a diaphragm. In order to reduce weight and rigidity, the diaphragm 1 is made of kraft paper or the like having a honeycomb structure, or foamed polystyrene, a balsa material, or the like, and becomes an arc shape at the time of molding. Thus, it is curved with a large curvature.
[0016]
The diaphragm 1 has a horizontally long rectangular shape, is curved along the length direction thereof, and is provided with one moving magnet type driver 2 at a substantially central point on the back surface thereof.
[0017]
Further, both end portions of the diaphragm 1 are supported by the support portion 3 with a constant pressure always applied through the buffer material 5.
[0018]
FIG. 3 shows a configuration example of the support portion 3. The support portion 3 has a holder 4 having a substantially U-shaped cross section. The holder 4 includes a pair of arms 4a that are spaced from each other and face each other, and a connecting portion 4b that is provided at the outer end of the pair of arms 4a. The outer end portion of the diaphragm 1 is accommodated and supported between the pair of arms 4a.
[0019]
A buffer material 5 made of an elastic member such as rubber is provided between the pair of arms 4 a, and the outer end portion of the diaphragm 1 is in contact with the buffer material 5. The contact state may be direct or indirect via a spacer.
[0020]
A plate-shaped pressurizer 6 is provided between the pair of arms 4 a and outside the buffer material 5.
[0021]
Furthermore, a pressurizing screw 7 is screwed in a substantially central portion of the connecting portion 4b, and the tip of the screw 7 is brought into contact with the outer surface of the pressurizer 6, and the screw 7 is appropriately tightened from the outside, or By returning, the pressurizing state to the pressurizer 6 can be arbitrarily adjusted.
[0022]
Thus, the diaphragm 1 of the present invention is supported by applying a force that further bends both ends in the bending direction via the buffer material 5, the pressurizer 6, the screw 7, and the like. It can be easily adjusted by loosening. It should be noted that the pressurizing force on both sides is equalized during pressurization.
[0023]
As a member for applying pressure from both ends of the diaphragm 1, a cushioning material such as urethane foam may be used instead of the cushioning material 5 such as rubber, or a spring or the like may be used.
[0024]
FIG. 4 is a plan view showing a state in which the support portion 3 that supports the diaphragm 1 is fixed on the support plate 8. The bottom of the support portion 8 is fixed to the support plate 8 by appropriate fixing means such as screwing using a screw 9.
[0025]
FIG. 5 shows a rear view of the frame-like case 9 in which the speaker unit shown in FIG.
[0026]
FIG. 6 shows an example of the configuration of the moving magnet type driver 2 used in the present invention.
[0027]
The driver 2 has a magnetic circuit 13 including a yoke 10, a pole piece 11, and a magnet 12 provided therebetween, and one end disposed between the magnetic gaps of the magnetic circuit 13, and the other end substantially on the back surface of the diaphragm 1. The voice coil 14 is bonded to the center by bonding.
[0028]
Each side of the yoke 10 is connected to one end of a damper 15 having a double structure, and the other end of the damper 15 is attached to the inner wall of the frame 16, thereby constituting the driver 2.
[0029]
A flange 16a for attachment extending outward is formed on the outer peripheral portion of the frame 16, and a screw hole is formed in the flange 16a. The flange 16a is set on the back side of the diaphragm 1 via the attachment screw 17 and the spacer 18. The screwed driver 2 is mounted by screwing an embedded nut 19 on the tip of the mounting screw 17 from the front side of the diaphragm 1.
[0030]
As described above, the driver 2 of the present invention adheres the voice coil 14 to the diaphragm 1 and embeds the screws 17 for attaching the frame around the voice coil 14 of the diaphragm 1, and only the attachment portion of the frame 16 is the diaphragm. 1 has a separate structure of a voice coil 14 and a magnetic circuit 13 which are provided with a spacer 18 so as to be in contact with 1 and screw the frame 16 of the magnetic circuit holding mechanism.
[0031]
According to this structure, the magnetic circuit 13 of the driver 2 is attached to the frame 16 screwed to the diaphragm 1 in a separated form without contacting with the voice coil 14, and has a large mechanical strength. A highly efficient speaker can be obtained using the magnetic circuit 13.
[0032]
In operation, when an audio signal is applied to the voice coil 14, the voice coil 14 vibrates and the vibration is transmitted to the diaphragm 1.
[0033]
The diaphragm 1 of the present invention is curved and formed along the length direction, and both ends of the diaphragm 1 are always subjected to a constant pressure via the buffer material 5, and the diaphragm 1 is applied with a force that further curves from both ends. Therefore, when the central portion of the diaphragm 1 is driven, the diaphragm 1 moves integrally, and the movement of the piston motion at the cone type speaker is obtained.
[0034]
Therefore, as shown in Figure 7a, to midrange beginning of divided vibration from f _0, becomes flat frequency characteristic, even one driver 2 with good frequency characteristics, can be constructed thin speaker with a relatively small size.
[0035]
In addition, in the said Example, although the pressurization demonstrated the example which pressurizes in a curving direction, the same effect can be acquired also as a reverse direction (tensile direction). In the case of the reverse direction, for example, both ends of the diaphragm 1 may be sandwiched by members having a U-shaped cross section, and the members may be connected to the screws 7 and the screws 7 may be moved to the outside to apply a tensile force. . Or it is good also as a structure etc. which attach one end of a spring to the both ends of the diaphragm 1 directly or indirectly, respectively, pull by the spring force, and pressurize in a negative direction.
[0036]
【The invention's effect】
As described above, according to the present invention, the rectangular diaphragm 1 is curved along its length direction, both ends thereof are supported in a pressurized state, and the center portion thereof is driven. The plate 1 moves in a piston motion, and a speaker having a flat frequency characteristic from f ₀ to the middle sound range can be obtained.
[0037]
In the case of a flat plate-like finite baffle, reproduction cannot be performed at a low frequency without using a large plate having a shape size of 900 × 1800 mm, but this system is a small curved plate having a shape size of, for example, 200 × 300 mm. can improve the properties of the f ₀ to divided vibration can also be miniaturized.
[0038]
Moreover, since a plurality of drivers are not used in order to improve frequency characteristics, and driving is performed by one driver 2 as in the prior art, the cost can be reduced.
[0039]
Further, since the diaphragm 1 has a honeycomb structure, in addition to the above effects, it is lightweight and rigid, and since there is only one driver 2, the overall weight can be reduced, and the pressurizing means has a simple configuration, which increases the cost. Can be suppressed.
[0040]
In addition, since the driver 2 is a moving magnet type and the large magnetic circuit 13 can be used, a highly efficient speaker can be obtained.
[Brief description of the drawings]
FIG. 1 shows a plan view of one embodiment of the present invention.
FIG. 2 is a perspective view of a diaphragm used in an embodiment of the present invention.
FIG. 3 shows a configuration example of a support portion of a diaphragm used in an embodiment of the present invention.
FIG. 4 is a plan view showing a state in which the speaker unit of one embodiment of the present invention is attached to a support plate.
FIG. 5 is a rear view of the speaker device according to the embodiment of the present invention.
FIG. 6 shows a configuration example of a moving magnet type driver used in one embodiment of the present invention.
7A is a frequency characteristic with respect to sound pressure of the present invention, and FIG. 7B is a conventional example.
FIG. 8 shows a schematic configuration of a conventional speaker.
FIG. 9 is a diagram illustrating the configuration of a driver used in a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Driver 3 Support part 4 Holder 4a Arm 4b Connecting part 5 Buffer material 6 Pressurizer 7 Screw 8 Support plate 9 Case 10 Yoke 11 Pole piece 12 Magnet 13 Magnetic circuit 14 Voice coil 15 Damper 16 Frame 17 Screw 18 Spacer 19 Embedded nut

Claims (3)

In a speaker having a rectangular diaphragm (1),
The diaphragm (1) is curved along its length direction, and both ends thereof are supported while being pressed in a bending direction via a pressurizing means, and at substantially the center of the diaphragm (1). A speaker, wherein a driver (2) is attached and driven. 2. The speaker according to claim 1, wherein the diaphragm (1) has a honeycomb structure, and the pressurizing means is made of a cushioning material (5) such as rubber or urethane foam or a spring. The loudspeaker according to claim 1, wherein the driver (2) has a moving magnet structure.

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