JP4170149B2 - 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 with a diaphragm.
[0003]
FIG. 8 shows a front view of the conventional example. In the figure, 30 is a planar diaphragm, 31 is a driver provided at a node position of the planar diaphragm 30, and the planar diaphragm 30 is a multipoint drive system using a plurality of drivers 31.
[0004]
In a loudspeaker having a flat diaphragm, the diaphragm 30 is vibrated by, for example, a honeycomb structure in order to give rigidity to the diaphragm 30, but the rigidity is determined by the honeycomb structure and material, and the frequency changes, but the primary vibration A node is generated in the diaphragm 30 at a specific frequency, and the diaphragm 30 has a narrow band to vibrate integrally and can dip in frequency characteristics.
[0005]
In order to improve this, a driver 31 is attached to the node portion to perform multipoint driving.
[0006]
FIG. 9 shows an example of the configuration of a driver 31 for multi-point driving. 32 is a yoke, 33 is a pole piece, 34 is a magnet, 35 is a magnetic circuit comprising these members, and 36 is 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]
Further, in addition to the driver 31 having such a configuration, as shown in Japanese Examined Patent Publication No. 57-65094, a 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 31 are attached or weighted so as to be driven at multiple points, so that the manufacturing 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 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 back turns 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 thereof is to provide an inexpensive speaker that can obtain excellent frequency characteristics, has good sound quality, and can be downsized. There is.
[0011]
[Means for Solving the Problems]
The present invention provides a speaker having a rectangular diaphragm 1,
The diaphragm 1 is curved along the length thereof, one end thereof is semi-fixed, the other end is supported via an edge 6 so as to be capable of amplitude, and a driver is attached to the other end from the center of the back surface The above-mentioned purpose is achieved.
[0012]
In this case, the diaphragm 1 driven by a driver has a honeycomb structure.
[0013]
The driver comprises a moving magnet type driver 8, and the damper for supporting the magnetic circuit has a butterfly damper structure, and the butterfly damper has a conductive butterfly damper 16 having a conductive path formed thereon. Configured.
[0014]
That is, the driver includes a hammer 15 coupled to the diaphragm, and a voice coil 14 having the hammer 15 provided at the front end and the rear end disposed in the magnetic gap 13 of the magnetic circuit. The voice coil 14 is supported by a conductive butterfly damper 16 having a conductive path connecting the lead wire of the voice coil and the external lead wires 18a and 18b.
[0015]
DETAILED DESCRIPTION OF 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 the length direction. The material used is a kraft paper with a honeycomb structure, or styrofoam, balsa material, etc. in order to reduce weight and rigidity, and it is curved with a large curvature so that it becomes an arc at the time of molding. Has 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 the line AA.
[0018]
The diaphragm 1 is horizontally long and is disposed on the flat support plate 2 in a non-contact state with a gap. One end of the diaphragm 1 is inserted into a groove 3a 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 portion of the holder 3, the support shaft 4 is inserted therethrough, and the lower end portion 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 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 capable of amplitude. That is, one end of the edge 6 is coupled to the front or back surface of the other end portion of the diaphragm 1, and the other end of the edge 6 is coupled to the support portion 7 provided upright on the other end portion 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 and at a substantially central position on the edge 6 side from the center.
[0021]
In addition, in FIG. 2, 9 is an upper plate and constitutes a frame-like frame surrounding the diaphragm 1 together with the lower support plate 2, the holder fixing portion 5, and the like.
[0022]
4A is a plan view of the moving magnet type driver 8, and FIG. 4B is a side sectional view showing the internal structure of the moving magnet type driver 8. FIG.
[0023]
In FIG. 4B, reference numeral 10 denotes a cup-shaped yoke, and a short columnar magnet 11 is provided inside. A disc-shaped pole piece 12 is provided on 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 constitute a magnetic circuit. Note that the upper end portion of the peripheral wall 10 a of the yoke 10 that is a component of the magnetic circuit is connected to the inner end portion of the frame 17.
[0024]
A lower end portion of the voice coil 14 is disposed in the magnetic gap 13, a metal hammer 15 having a substantially ring shape 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 for good sensitivity, and a plurality of conductive paths made of conductive foil are formed.
[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 that connect an inner peripheral annular portion 16a and an outer peripheral annular portion 16b formed concentrically and spaced outside thereof. The conductive butterfly damper 16 is produced 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 outward in the radial direction, and an outer end portion 16g formed on the outer circumferential ring portion 16b side and extending inward in the radial direction. ing.
[0029]
The inner end portion 16d and the outer end portion 16g are connected to each other by an arcuate portion having a substantially U shape including a forward path and a return path. That is, the outer end portion of the inner end portion 16d is connected to the first arc-shaped portion 16e extending in the clockwise direction, for example, along the outer periphery of the inner peripheral ring portion 16a, and the outer end portion 16g is the end of the first arc-shaped portion 16e. It is connected to a second arcuate portion 16f that is folded back at the portion and extends arcuately in the counterclockwise direction.
[0030]
On the surface of the circular conductive butterfly damper 16, a conductive path is formed by dividing the conductive foil coated on the surface into a plurality of parts by etching or other methods, as indicated by oblique lines. These conductive paths indicated by hatching extend from the inner ring portion 16a side toward the outer ring portion 16b side, and the inner end portion 16d of one of the plurality of conductive paths is formed as shown in FIG. ), As indicated by reference numeral 19, it is connected to one end of the voice coil 14, and the outer end portion 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 indicated by reference numeral 20, and the outer end 16g of this conductive path is connected to the other external lead 18b. .
[0032]
In addition, in FIG. 4B, reference numeral 12 a is a vent hole formed in the approximate center of the pole piece 12, and 10 a is a vent hole formed in the approximate center of the bottom of the yoke 10.
[0033]
In the illustrated example, four connecting portions 16 c having conductive paths on the upper surface are formed, and among these, the conductive paths on a pair of adjacent connecting portions 16 c are used for the leader line processing of the voice coil 14.
[0034]
Of course, when the driver becomes smaller or larger in size according to the size of the speaker, the number of connecting portions 16c, the shape of the arm, and the like are appropriately changed accordingly.
[0035]
In assembling the moving magnet type driver 8, the lower end portion of the voice coil 14 in which the inner peripheral portion of the conductive butterfly damper 16 is joined to the magnetic gap 13 of the magnetic circuit prepared in advance is passed through a jig (not shown). The outer peripheral ring portion 16b of the conductive butterfly damper 16 is fixed to a step portion 17b formed inside the upper end portion 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 a predetermined conductive path.
[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 way is fixed at a predetermined position on the back surface of the diaphragm 1 with the front surface of the hammer 15 preferably using a fast curing type acrylic adhesive.
[0039]
The speaker is a relatively small speaker for a personal computer or the like, the moving magnet type driver 8 may be small and light in the small diaphragm 1 having a size of about 20 × 30 cm, the conductive butterfly damper 16 is sufficient in a four-divided structure, and vibration is achieved. 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 of 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, and one end in the lateral direction of the diaphragm 1 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, vibration such as opening and closing movement of the door occurs at a low frequency, and the diaphragm 1 moves integrally and becomes a movement of a piston motion called 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 A speaker with excellent frequency characteristics can be constructed.
[0043]
In the above embodiment, the device is intended for a small device and is driven by one point by a lightweight moving magnet type driver 8 of about 30 g. However, in order to increase efficiency, it is driven by two moving magnet type drivers 8. Also good.
[0044]
In addition, since the driver for driving a large diaphragm of 45 × 60 cm or more is slightly larger and weighs 100 g or more, the magnetic circuit is a driver 23 supported by two suspensions 21 and 22 as shown in FIG. 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, the frame 25 is attached using screws 21 and, if necessary, spacers 27. The hammer 15 is fixed at a predetermined position on the back surface of the diaphragm 1 using a fast-curing acrylic adhesive.
[0046]
【The invention's effect】
As described above, according to the present invention, the horizontally-long rectangular diaphragm 1 is curved along the length direction, one end thereof is semi-fixed, and the other end is moved. Thus, a speaker having a flat frequency characteristic from f ₀ to the mid sound range can be obtained.
[0047]
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. 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. In addition, since a plurality of drivers are not used for improving frequency characteristics as in the prior art, a small one can be driven at a single point. The overall weight can be reduced, and the pressurizing means has a simple configuration, so that high cost can be suppressed.
[0049]
In addition, 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 a conductive butterfly damper 16, and a conductive path integrated with the conductive butterfly damper 16 is formed. The voice coil 14 is drawn 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 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 a flat diaphragm according to an embodiment of the present invention.
FIG. 3 is a cross-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 is a frequency characteristic of the present invention, and FIG. 6B is a frequency characteristic of a conventional example.
FIG. 7 is an explanatory view of another damper used in the present invention and its attached state.
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 ring part 16b Outer ring part 16c Connection part 16d Inner end part 16e First arcuate part 16f Second arcuate part 16g Outer end part 17 Frame 17a Peripheral wall 17b Step part 17c Lead wire insertion holes 18a, 18b External leads Wire 19 Soldering portion 20 at one end of voice coil Soldering portion 21 at the other end of voice coil Suspension 22 Suspension 23 Driver 24 Magnetic circuit

Claims (4)

In a speaker having a rectangular diaphragm (1),
The diaphragm (1) is curved along the length thereof, one end thereof is semi-fixed, the other end is supported via an edge (6) so as to be capable of swinging, and closer to the other end from the center of the back surface A speaker, characterized in that a driver is attached to the motor and driven. 2. The loudspeaker according to claim 1, wherein the diaphragm (1) driven by the driver has a honeycomb structure. 3. The speaker according to claim 1, wherein 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) in which the hammer (15) is provided at a front end portion and a rear end portion is disposed in a magnetic gap (13) of a magnetic circuit. The voice coil (14) is supported by a conductive butterfly damper (16) having a conductive path connecting the lead wire of the voice coil and the external lead wires (18a, 18b). Features a speaker.

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