JP2004120517A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive speaker with excellent sound quality which obtains an excellent frequency characteristic with one driver. <P>SOLUTION: A rectangular diaphragm 1 is molded by being curved in its length direction. Both ends of the diaphragm are pressurized, and a moving magnet type driver 2 is used to perform single point driving of a central part. In this case, the diaphragm 1 is formed in a honeycomb structure, and a pressurizing means is made of a shock absorbing material 5 like rubber or foamed urethane, or a spring. In addition, a driver 2 is formed in a moving magnet structure. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker for audio equipment.
[0002]
[Prior art]
There are various types of loudspeakers. Among them, as shown in, for example, Japanese Patent Publication No. 44-23783 and Japanese Patent Publication No. 62-21479, a rectangular flat type speaker capable of reproducing to a high frequency by a simple configuration is disclosed. There is a speaker provided with a diaphragm.
[0003]
FIG. 8 shows a front view of one conventional example. In the figure, reference numeral 1 'denotes a planar diaphragm, 2' denotes a driver provided at each node of the planar diaphragm 1 ', and the planar diaphragm 1' has a multi-point drive system using a plurality of drivers 2 '. Has become.
[0004]
In the case of a loudspeaker having a flat diaphragm, the diaphragm 1 'is vibrated by, for example, forming a honeycomb structure to have rigidity. 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 in which the diaphragm 1 'vibrates integrally is narrowed, and a dip can be formed in the frequency characteristics.
[0005]
In order to improve this, a driver 2 'is attached to a node as shown in FIG. 8 to perform multipoint driving.
[0006]
FIG. 9 shows an example of the configuration of a driver 2 'for multi-point driving, wherein 10' is a yoke, 11 'is a pole piece, 12' is a magnet, 13 'is a magnetic circuit composed of these members, and 14' is a vibrating tip. A voice coil 15 'connected to the back of the plate 1' is a damper having one end connected to the voice coil 14 'and the other end attached to the frame 16'.
[0007]
In addition to the driver 2 'having such a configuration, as shown in Japanese Patent Publication No. 57-65094, the frequency is flattened by, for example, adding a weight to balance the diaphragm.
[0008]
[Problems to be solved by the invention]
As described above, in the speaker using the conventional flat diaphragm, a plurality of drivers 2 'are attached or weighted for multi-point driving, so that the manufacturing is complicated and the cost is increased. , There was a problem.
[0009]
In addition, as shown in FIG. 7B, there is a problem that a large dip occurs in the middle sound range and the sound quality is not good. In other words, in the conventional example using a flat finite baffle, the sound on the rear surface goes to the front surface due to its 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 obtained. I couldn't get it.
[0010]
The present invention has been proposed in view of the above, and it is an object of the present invention to provide an excellent frequency characteristic with a single driver, a good sound quality, and a small size that can be downsized. It is to provide a simple speaker.
[0011]
[Means for Solving the Problems]
The present invention relates to a speaker having a rectangular diaphragm 1, wherein the diaphragm 1 is formed to be curved along its length direction, and both ends thereof are supported while being further pressed in a bending direction via a pressing means, The above object is achieved by a configuration in which the driver 2 is mounted and driven substantially at the center of the diaphragm 1.
[0012]
Further, the vibration plate 1 has a honeycomb structure, and the pressurizing means comprises a cushioning material 5 such as rubber or urethane or a spring.
[0013]
Further, the driver 2 has a moving magnet structure.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings.
[0015]
【Example】
FIG. 1 shows a configuration of a main part of an 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, which is made of kraft paper or the like in a honeycomb structure, or made of styrene foam, balsa material, or the like in order to reduce the weight and provide rigidity, and is formed into an arc shape at the time of molding. It is formed with a large curvature as described above.
[0016]
The diaphragm 1 has a horizontally long rectangular shape, is formed to be curved along its length direction, and one moving magnet type driver 2 is provided substantially at the center of the back surface.
[0017]
Further, both ends of the diaphragm 1 are supported by the support portion 3 through the cushioning material 5 while constantly applying a constant pressure.
[0018]
FIG. 3 shows a configuration example of the support unit 3. The support 3 has a holder 4 having a substantially U-shaped cross section. The holder 4 includes a pair of arms 4a spaced apart and opposed to each other, and a connecting portion 4b provided at an outer end of the pair of arms 4a. The outer end of the diaphragm 1 is housed and supported between the pair of arms 4a.
[0019]
Between the pair of arms 4a, a cushioning member 5 made of an elastic member such as rubber is provided, and the outer end of the diaphragm 1 is in contact with the cushioning member 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 cushioning material 5.
[0021]
Further, a screw 7 for pressurizing is screwed in a substantially central part of the connecting portion 4b so as to be able to advance and retreat, and the tip of the screw 7 is in contact with the outer surface of the pressurizer 6, and the screw 7 is appropriately tightened from the outside, or By returning, the pressurized state of the pressurizer 6 can be adjusted arbitrarily.
[0022]
As described above, the diaphragm 1 of the present invention is supported by applying a force for bending both ends in the bending direction through the cushioning member 5, the pressurizer 6, the screw 7, and the like. This pressing force tightens the screw 7, It is configured to be easily adjusted by loosening. In pressing, the pressing force on both sides is made equal.
[0023]
In addition, as a member for applying a pressing force 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 supporting 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 an appropriate fixing means such as screwing using a screw 9.
[0025]
FIG. 5 is a rear view showing a state where the speaker unit shown in FIG.
[0026]
FIG. 6 shows a configuration example of a moving magnet type driver 2 used in the present invention.
[0027]
The driver 2 has a magnetic circuit 13 composed of a yoke 10, a pole piece 11 and a magnet 12 provided between the yoke 10 and a magnetic gap of the magnetic circuit 13. And a voice coil 14 bonded to the center by bonding.
[0028]
One end of a double-structured damper 15 is connected to each side of the yoke 10, and the other end of the damper 15 is attached to the inner wall of a frame 16, and these constitute the driver 2.
[0029]
A mounting flange 16a extending outward is formed on the outer periphery of the frame 16, and a screw hole is formed in the flange 16a. The flange 16a is set on the rear side of the diaphragm 1 via mounting screws 17 and spacers 18. The mounted driver 2 is mounted by screwing the embedded nut 19 to 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, embeds the frame mounting screw 17 around the voice coil 14 of the diaphragm 1, and sets only the mounting portion of the frame 16 to the diaphragm 1. A spacer 18 is provided so as to be in contact with the magnetic circuit holding mechanism 1, and a separate structure is provided between the voice coil 14 for screwing the frame 16 of the magnetic circuit holding mechanism and the magnetic circuit 13.
[0031]
According to this structure, the magnetic circuit 13 of the driver 2 is attached to the frame 16 which is screwed to the diaphragm 1 in a separated form without any contact with the voice coil 14 and has a large mechanical strength. Using the magnetic circuit 13, a highly efficient speaker can be obtained.
[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 formed to be curved along the length direction, and both ends thereof are constantly applied with a constant pressure via the cushioning material 5. Therefore, when the central portion of the diaphragm 1 is driven, the diaphragm 1 moves integrally, and becomes a piston motion in a cone type speaker.
[0034]
For this reason, as shown in FIG. 7A, the frequency characteristics become flat from f ₀ to the mid-range where split vibration starts, and a relatively small and thin loudspeaker having good frequency characteristics even with one driver 2 can be configured.
[0035]
In the above-described embodiment, the example in which the pressure is applied in the bending direction has been described. However, the same operation and effect can be obtained even in the opposite direction (pulling direction). In the case of the opposite direction, for example, both ends of the diaphragm 1 may be sandwiched by members having a U-shaped cross section, this member may be connected to the screw 7, the screw 7 may be moved outward, and a tensile force may be applied. . Alternatively, one end of each spring may be directly or indirectly attached to both ends of the diaphragm 1, and the spring may be pulled by the spring force to apply a pressure in the negative direction.
[0036]
【The invention's effect】
As described above, according to the present invention, the rectangular diaphragm 1 is formed to be curved along its length direction, both ends thereof are supported in a pressurized state, and the substantially central portion thereof is driven. plate 1 becomes a movement of the piston motion, it is possible to obtain a speaker having a flat frequency characteristic to midrange from f _0.
[0037]
In the case of a plate-shaped finite baffle, reproduction to a low frequency cannot be performed unless a large plate having a shape size of 900 × 1800 mm is used, but this system uses 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]
Further, unlike the related art, a plurality of drivers are not used to improve the frequency characteristics, and the driver is driven by one driver 2, so that the cost can be reduced.
[0039]
Further, since the diaphragm 1 has a honeycomb structure, it has light weight and rigidity in addition to the above effects, and the number of the driver 2 is one, so that the overall weight can be reduced. Can be suppressed.
[0040]
Further, since the driver 2 is of a moving magnet type and a 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 one embodiment of the present invention.
FIG. 3 shows an example of a configuration of a supporting 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 according to one embodiment of the present invention is mounted on a support plate.
FIG. 5 is an explanatory 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 shows a frequency characteristic with respect to a sound pressure according to the present invention, and FIG. 7B shows a conventional example.
FIG. 8 shows a schematic configuration of a conventional speaker.
FIG. 9 is a diagram illustrating a 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 Connection 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 vibrating plate (1) is formed in a curved shape along its length direction, and both ends thereof are supported while being further pressed in a bending direction via a pressing means, and at substantially the center of the vibrating plate (1). A speaker to which a driver (2) is attached and driven. 2. A speaker according to claim 1, wherein said diaphragm (1) has a honeycomb structure, and said pressing means comprises a cushioning material (5) such as rubber or urethane or a spring. The speaker according to claim 1, wherein the driver (2) has a moving magnet structure.

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