JP2004356868A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost speaker which ensures superior frequency characteristics, provides good sound quality, and can be miniaturized. <P>SOLUTION: A sideways long rectangular diaphragm 1 is formed by being bent along its length.One end of the diaphragm 1 is half fixed and the other end is supported by an edge 6 to make it oscillatory. A driver is provided for driving the diaphragm 1 at a position shifted to the edge 6 from the backside center of the diaphragm 1 having a honeycomb structure. The driver is a moving magnet type driver 8 comprising a hammer 15 coupled with the diaphragm 1 and a voice coil 14. The hammer 15 is mounted on the top end of the coil 14, and the rear end of the coil 14 is disposed in the magnetic gap 13 of a magnetic circuit. A conductive butterfly damper 16 having a conduction line for connecting the outgoing line of the voice coil and an external lead wire 18 supports the voice coil 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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. Some speakers have a diaphragm.
[0003]
FIG. 8 shows a front view of one conventional example. In the figure, reference numeral 30 denotes a planar diaphragm, and 31 denotes a driver provided at each node of the planar diaphragm 30. The planar diaphragm 30 is of a multi-point drive system using a plurality of drivers 31.
[0004]
In a speaker in which the diaphragm is a flat plate, the diaphragm 30 is vibrated by a honeycomb structure or the like in order to have rigidity. The rigidity is determined by the honeycomb structure and the material, and the frequency changes, but in the primary vibration, A node is generated in the diaphragm 30 at a specific frequency, and the band in which the diaphragm 30 vibrates integrally becomes narrow, so that a dip can be formed in the frequency characteristics.
[0005]
In order to improve this, the driver 31 is attached to the node, and a multipoint drive is performed.
[0006]
FIG. 9 shows an example of the configuration of a driver 31 for multi-point driving, wherein 32 is a yoke, 33 is a pole piece, 34 is a magnet, 35 is a magnetic circuit composed of these members, and 36 is a tip connected to the back of the diaphragm 30. The voice coil 37 is a damper having one end coupled to the voice coil 36 and the other end attached to the frame 38.
[0007]
In addition to the driver 31 having such a configuration, as shown in Japanese Patent Publication No. 57-65094, the frequency is flattened by 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 31 are attached or weighted for multi-point driving, so that the production is complicated and the cost is increased. There was a problem.
[0009]
Further, as shown in FIG. 6B, 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 back wraps around the front 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 an object of the present invention is to provide an inexpensive speaker that can obtain excellent frequency characteristics, has good sound quality, and can be downsized. It is in.
[0011]
[Means for Solving the Problems]
The present invention relates to a speaker having a rectangular diaphragm 1,
The vibrating plate 1 is formed to be curved along its length direction, one end thereof is semi-fixed, the other end is supported via an edge 6 so as to be able to swing, and a driver is attached from the center of the back surface to the other end. Thus, the above-mentioned object is achieved.
[0012]
In this case, the diaphragm 1 driven by the driver is characterized by having a honeycomb structure.
[0013]
The driver is composed of a moving magnet type driver 8, and the damper for supporting the magnetic circuit has a band shape with a damper itself, and has a butterfly damper structure. The butterfly damper has a conductive butterfly damper 16 having a conductive path formed thereon. It is configured.
[0014]
That is, the driver includes a hammer 15 coupled to the diaphragm, and a voice coil 14 provided with the hammer 15 at a front end and a rear end disposed in a magnetic gap 13 of a magnetic circuit. The voice coil 14 is supported by a conductive butterfly damper 16 in which a conductive path connecting the lead wire of the voice coil and the external lead wires 18a and 18b is formed.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
[0016]
【Example】
FIG. 1 is a perspective view of a diaphragm used in the present invention. The diaphragm 1 has a horizontally long rectangular shape, and is curved along its length direction. The material is made of kraft paper, etc. in a honeycomb structure, or Styrofoam, Balsa material, etc., in order to make it lighter and more rigid, and it is formed with a large curvature so that it becomes an arc when molding. Have been.
[0017]
FIG. 2 is a rear view of a board-type speaker provided with the diaphragm 1, and FIG. 3 is a sectional view taken along line AA of FIG.
[0018]
The vibration plate 1 is disposed on a horizontally long and flat support plate 2 in a non-contact state with a gap therebetween. One end of the vibration plate 1 is inserted into a groove 3 a formed in a holder 3 having a substantially U-shaped cross section provided at one end of the support plate 2 and is supported in a semi-fixed state. That is, a hole 3b is formed in the base of the holder 3, the support shaft 4 is inserted therethrough, the lower end of the support shaft 4 is fixed to a holder fixing portion 5 provided on the support plate 2, and the holder 3 is supported. The diaphragm 1 is rotatable via a shaft 4, and one end of the diaphragm 1 is semi-fixed, that is, movably supported.
[0019]
The other end of the diaphragm 1 is supported via a roll-shaped edge 6 so as to be able to swing. That is, one end of the edge 6 is connected to the front surface or the back surface of the other end of the diaphragm 1, and the other end of the edge 6 is connected to the support portion 7 erected on the other end of the support plate 2.
[0020]
A moving magnet type driver 8 for driving the diaphragm is provided on the rear surface of the diaphragm 1 at a position substantially at the center on the edge 6 side from the center.
[0021]
In addition, in FIG. 2, reference numeral 9 denotes an upper plate, which together with the lower support plate 2, the holder fixing portion 5, and the like constitutes a frame-like frame surrounding the periphery of the diaphragm 1.
[0022]
FIG. 4A is a plan view of the moving magnet type driver 8, and FIG. 4B is a side sectional view showing an internal structure of the moving magnet type driver 8.
[0023]
In FIG. 4B, reference numeral 10 denotes a cup-shaped yoke, in which a short columnar magnet 11 is provided, and a disc-shaped pole piece 12 is provided above the magnet 11, and an outer periphery of the pole piece 12 is provided. A magnetic gap 13 is formed between the surface and the upper inner peripheral surface of the peripheral wall 10a of the yoke 10, and these form a magnetic circuit. The upper end of the peripheral wall 10 a of the yoke 10, which is a component of the magnetic circuit, is connected to the inner end of the frame 17.
[0024]
The lower end of the voice coil 14 is disposed in the magnetic gap 13, and a substantially ring-shaped metal hammer 15 is provided on the upper portion of the voice coil 14, and the voice coil 14 is supported via a conductive butterfly damper 16. ing.
[0025]
The conductive butterfly damper 16 has an arm-shaped butterfly damper structure in order to improve sensitivity, and has a plurality of conductive paths made of conductive foil.
[0026]
FIG. 5 shows a plan view of the conductive butterfly damper 16.
[0027]
The conductive butterfly damper 16 has a plurality of arm-shaped connecting portions 16c for connecting an inner circumferential annular portion 16a and an outer circumferential annular portion 16b formed concentrically apart on the outside thereof. The conductive butterfly damper 16 is made by molding a flexible resin.
[0028]
The connecting portion 16c is formed on the inner circumferential ring portion 16a side and has an inner end portion 16d extending radially outward and an outer end portion 16g formed on the outer circumferential annular portion 16b side and extending radially inward. ing.
[0029]
The inner end portion 16d and the outer end portion 16g are connected by a substantially U-shaped arc formed by a forward path and a return path. That is, the outer end of the inner end 16d is connected to the first arc-shaped portion 16e extending, for example, clockwise along the outer circumference of the inner peripheral annular portion 16a, and the outer end 16g is connected to the end of the first arc-shaped portion 16e. It is connected to a second arc-shaped portion 16f that is folded back at the portion and extends in an arc shape in the counterclockwise direction.
[0030]
On the surface of the circular conductive butterfly damper 16, as shown by hatching, a conductive path is formed by dividing a conductive foil coated on the surface into a plurality of parts by etching or other methods. These conductive paths indicated by oblique lines extend from the inner peripheral annular portion 16a toward the outer peripheral annular portion 16b, and the inner end 16d of one of the plurality of conductive paths is formed as shown in FIG. 3), as indicated by reference numeral 19, the one end of the voice coil 14 is connected, and the outer end 16g of this conductive path is connected to one external lead wire 18a.
[0031]
The other end of the voice coil 14 is connected to the inner end 16d of the adjacent conductive path, as shown by reference numeral 20, and the outer end 16g of this conductive path is connected to the other external lead wire 18b. .
[0032]
In addition, in FIG. 4B, reference numeral 12a denotes a ventilation hole formed substantially at the center of the pole piece 12, and 10a denotes a ventilation hole formed substantially at the center of the bottom of the yoke 10.
[0033]
In the illustrated example, four connecting portions 16c having conductive paths are formed on the upper surface, and the conductive paths on a pair of adjacent connecting portions 16c among them are used for the lead wire processing of the voice coil 14.
[0034]
When the size of the driver becomes smaller or larger in accordance with the size of the speaker, the number of the connecting portions 16c may be appropriately changed in accordance with the size and the shape of the arm.
[0035]
In assembling the moving magnet type driver 8, the lower end of the voice coil 14 to which the inner peripheral portion of the conductive butterfly damper 16 is joined to the magnetic gap 13 of the magnetic circuit manufactured in advance through a jig (not shown). Then, the outer peripheral annular portion 16b of the conductive butterfly damper 16 is fixed to the step 17b formed inside the upper end of the peripheral wall 17a of the frame 17 to which the magnetic circuit is attached.
[0036]
A pair of lead wire insertion holes 17c are formed in a part of the peripheral wall 17a, and the external lead wires 18a and 18b respectively inserted therethrough are connected to predetermined conductive paths.
[0037]
A hammer 15 is attached to the upper end of the voice coil 14.
[0038]
The moving magnet type driver 8 assembled in this manner has the front surface of the hammer 15 fixed to a predetermined position on the rear surface of the diaphragm 1 preferably using a quick-curing acrylic adhesive.
[0039]
In the case of a relatively small speaker for personal computers or the like, a small diaphragm 1 having a size of about 20 × 30 cm requires a small and lightweight moving magnet type driver 8, and the conductive butterfly damper 16 has a four-part structure. A one-point driving method in which a moving magnet type driver 8 is provided at a substantially central portion on the roll edge side from the central portion on the back surface of the plate 1 may be used.
[0040]
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 via the hammer 15.
[0041]
The diaphragm 1 of the present invention is curved along the length direction, one end of the diaphragm 1 in the lateral direction is semi-fixed, and a moving magnet type driver 8 is provided closer to the other end side than the center portion. Since the side moves through the edge 6, at a low frequency, vibration such as a door opening / closing motion is generated, and the diaphragm 1 moves integrally, which is a motion of piston motion referred to in a cone type speaker.
[0042]
Accordingly, as shown in FIG. 6 (a), becomes a flat frequency characteristic to midrange beginning of divided vibration from f _0, excellent in a wide inexpensive of renewable frequency band to bass in small and thin with good frequency characteristics Speakers with improved frequency characteristics can be constructed.
[0043]
In the above-described embodiment, a single-point drive is performed by a light-weight moving magnet type driver 8 of about 30 g for a small-sized device. However, in order to increase efficiency, it is driven by two moving magnet type drivers 8. Is also good.
[0044]
Further, a driver for driving a large diaphragm of 45 × 60 cm or more is slightly larger and weighs 100 g or more. Therefore, as shown in FIG. 7, the magnetic circuit is formed by a driver 23 supported by two suspensions 21 and 22. Otherwise, the amplitude up to a low frequency cannot be obtained. Therefore, the driver 23 has a configuration in which the voice coil and the magnetic circuit are separated, and drives the diaphragm 1.
[0045]
When attaching to the diaphragm 1, it is attached to the frame 25 using the screws 21 and, if necessary, the spacer 27. The hammer 15 is fixed to a predetermined position on the back surface of the diaphragm 1 using a quick-curing acrylic adhesive.
[0046]
【The invention's effect】
As described above, according to the present invention, the horizontally long rectangular diaphragm 1 is formed to be curved along its length direction, one end thereof is fixed halfway, and the other end is moved. can be obtained a speaker having a flat frequency characteristic with consists f ₀ motion to midrange.
[0047]
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.
[0048]
Since the diaphragm 1 has a honeycomb structure, it has light weight and rigidity in addition to the above-described effects. Further, unlike the conventional case, a plurality of drivers are not used to improve frequency characteristics, and a small one can be driven by one point. The overall weight can be reduced, and the pressurizing means has a simple configuration, so that the cost can be reduced.
[0049]
Further, since the driver 8 is a moving magnet type and a large magnetic circuit can be used, a highly efficient speaker can be obtained.
[0050]
The voice coil, which is a component of the driver, is supported by the conductive butterfly damper 16, and a conductive path integrated therewith is formed on the conductive butterfly damper 16, and the voice coil 14 is pulled out through the conductive path. Since the wires and the external lead wires 18a and 18b can be easily connected, workability is improved, and disconnection accidents and the like can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view of a diaphragm used in an embodiment of the present invention.
FIG. 2 is a rear view of the planar diaphragm according to one embodiment of the present invention.
FIG. 3 is a sectional view taken along line AA in FIG.
4A is a plan view of a moving magnet type driver used in the present invention, and FIG. 4B is a side sectional view showing an internal structure.
FIG. 5 shows a plan view of a conductive butterfly damper in which the present invention is used.
6A shows a frequency characteristic of the present invention, and FIG. 6B shows a frequency characteristic of a conventional example.
FIG. 7 is an explanatory view of another damper used in the present invention and an attached state thereof.
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 Support plate 3 Holder 3a Groove 3b Hole 4 Support shaft 5 Holder fixing part 6 Edge 7 Support part 8 Moving magnet type driver 9 Upper plate 10 Yoke 11 Magnet 12 Pole piece 13 Magnetic gap 14 Voice coil 15 Hammer 16 Conductive butterfly Damper 16a Inner annular portion 16b Outer annular portion 16c Connecting portion 16d Inner end 16e First arc-shaped portion 16f Second arc-shaped portion 16g Outer end 17 Frame 17a Peripheral wall 17b Step 17c Lead wire insertion holes 18a, 18b External leads Line 19 Solder part 20 at one end of voice coil 20 Solder part 21 at the other end of voice coil 21 Suspension 22 Suspension 23 Driver 24 Magnetic circuit

Claims (4)

In a speaker having a rectangular diaphragm (1),
The vibrating plate (1) is curved along its length direction, one end of which is semi-fixed, the other end is supported via an edge (6) so as to be able to oscillate, and the center is closer to the other end than the back. A speaker which is driven by attaching a driver to the speaker. The speaker according to claim 1, wherein the diaphragm (1) driven by the driver has a honeycomb structure. Speaker according to claim 1 or 2, characterized in that the driver comprises a moving magnet type driver (8). In claim 1, 2 or 3,
The driver includes a hammer (15) coupled to the diaphragm, and a voice coil (14) provided with the hammer (15) at a front end and a rear end disposed in a magnetic gap (13) of a magnetic circuit. ), And that the voice coil (14) is supported by a conductive butterfly damper (16) in which a conductive path connecting the lead wire of the voice coil and the external lead wire (18a, 18b) is formed. Features speaker.

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