JP3838074B2 - Speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker used in various acoustic devices, and more particularly to an electrodynamic speaker for high-frequency reproduction.
[0002]
[Prior art]
In recent years, with the advent of sources outside the audible band including signals of 20 kHz or higher accompanying the digitization of audio equipment, it is required that speakers can sufficiently reproduce high frequencies of 20 kHz or higher.
[0003]
The prior art will be described with reference to the leaf speakers shown in FIGS. FIG. 5 is an exploded perspective view of a conventional leaf speaker, and FIG. 6 is a top view of a diaphragm as the main part.
[0004]
According to the figure, 9 is a leaf diaphragm, and 10 is a frame provided with a rectangular hole 10a for mounting the coil 9a of the leaf diaphragm 9 in an exposed state. The leaf diaphragm 9 is formed by forming a coil portion 9a made of a pattern coil on an insulating film and connecting a lead wire 13 to an end portion 9b of the coil portion 9a.
[0005]
Reference numeral 11 denotes a magnetic circuit, which is composed of a yoke 11b that is normally formed by bending a metal plate and a rectangular magnet 11a that is attached to the upper part of the bottom surface at the center of the magnetic circuit 11a. A magnetic gap 11d is formed in each of the side surface upper portions 11c.
[0006]
The frame 10 is mounted on the magnetic circuit 11 so that the coil portion 9a of the mounted leaf diaphragm 9 is aligned with the position of the magnetic gap 11d.
[0007]
With the above configuration, the coil portion 9 a exposed to the strong magnetic field generated in the magnetic gap 11 d of the magnetic circuit 11 vibrates according to the electric signal input from the lead wire 13, and sound is emitted from the leaf diaphragm 9.
[0008]
[Problems to be solved by the invention]
In the above conventional speaker, since the magnetic flux direction of the magnetic gap 11d is reversed between the two magnetic gaps 11d, the coil portion 9a is reversed. One of the inversion portions is used as a connection wiring portion with the lead wire 13 but is a portion not exposed to a magnetic field including the opposite side, which causes a reduction in use efficiency as a coil. Therefore, when a large driving force is obtained, it is difficult to reduce the size and weight because the magnetic circuit is increased in size.
[0009]
SUMMARY OF THE INVENTION The present invention solves the above-described problems, and aims to provide a small, lightweight, and highly efficient speaker that makes effective use of a pattern coil and effectively uses leakage magnetic flux in a magnetic gap of a magnet.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is a yoke having an inner bottom surface in which a plate frame is provided at the periphery and a center pole is formed, and is mounted around the center pole on the inner bottom surface. A speaker comprising a magnetic circuit comprising a magnet and a plate mounted on the magnet, and a diaphragm provided with a pattern coil on an insulating film provided on the magnetic circuit, the outer circumference of the magnet And an outer peripheral magnetic gap between the yoke plate frame, an inner peripheral magnetic gap between the inner periphery of the magnet and the center pole, and the outer and inner magnetic gaps on the outer peripheral magnetic gap and the inner peripheral magnetic gap. The winding direction of the pattern coil is reversed, and the winding direction of the pattern coil on the outer peripheral side magnetic gap and the pattern coil on the inner peripheral side magnetic gap is reversed. Corresponds to the direction of the magnetic gap of the inner periphery in Rukoto is reversed, with the sound pressure without the sound is canceled is secured, but can be effectively utilized patterned coils.
[0011]
According to the second aspect of the present invention, the winding direction of each pattern coil on the inner peripheral side magnetic gap and the outer peripheral side magnetic gap described in claim 1 is reversed and the pattern coil is continuous 1 The pattern coil is formed by one pattern coil, and the pattern coil can be effectively used for wiring with the lead wire at each of the inner and outer circumferences, which can be the same as the conventional wiring work man-hours.
[0012]
According to a third aspect of the present invention, radial wrinkles are provided on the diaphragm according to the first or second aspect, and the rigidity of the diaphragm can be improved and the distortion can be reduced. .
[0013]
According to a fourth aspect of the present invention, the radial wrinkles according to the third aspect are provided at substantially equal angles, and the vibration posture of the diaphragm is stabilized by equalizing the rigidity, and the speaker characteristics are improved. A stable product is obtained.
[0014]
According to a fifth aspect of the present invention, there is provided a lead wire for connection to the inner peripheral end of the pattern coil according to the first or second aspect from the bottom of the magnetic circuit portion to the through hole of the center pole. Wiring of the lead wire is performed using the through hole of the center pole on the inner peripheral side, so that the diaphragm space can be used effectively.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the speaker of the present invention will be described with reference to FIGS.
[0016]
(Embodiment 1)
FIG. 1 is an exploded perspective view of a speaker according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the relationship between a magnetic circuit and a diaphragm that are the main part, and FIG. 3 is the main part. It is a top view of a diaphragm.
[0017]
According to the figure, reference numeral 1 denotes a diaphragm having a frame 7 mounted on the top. 2 is a plate, 3 is a hollow magnet. Reference numeral 4 denotes a yoke, which has a center pole 4a projecting on the inner bottom surface and a plate frame 4b projecting in the same direction as the center pole 4a on the periphery.
[0018]
The diaphragm 1, plate 2, hollow magnet 3 and yoke 4 form a magnetic circuit A.
[0019]
In addition, an inner magnetic gap 4c is formed between the hollow magnet 3 fixed on the inner bottom surface of the yoke 4, the plate 2 thereon, and the center pole 4a, and the hollow magnet 3, the plate 2 above and the plate frame 4b are formed. An outer magnetic gap 4d is formed between the two.
[0020]
The diaphragm 1 has a pattern coil 6 formed on the surface of the insulating film 5 and is composed of an inner pattern coil 6a corresponding to the inner magnetic gap 4c and an outer pattern coil 6b corresponding to the outer magnetic gap 4d. The coil 6 is provided continuously and reversely wound. The outer and inner pattern coils 6a and 6b are respectively arranged on the outer and inner magnetic gaps 4c and 4d formed by the yoke 4, the hollow magnet 3 and the plate 2, and signals are input to both ends of the pattern coil 6. As a result, the insulating film 5 swings and the sound is reproduced.
[0021]
Since both the magnetic gaps 4c and 4d are formed by one hollow magnet 3, the direction of the magnetic field is reversed between the inner magnetic gap 4c and the outer magnetic gap 4d, and the pattern coil 6 is wound in the same direction. Since the pattern coil 6 cancels the sound and the sound pressure cannot be ensured if it is, the pattern coil 6 reverses the winding direction of the pattern coil 6 between the inner magnetic gap 4c and the outer magnetic gap 4d. 6a and the outer pattern coil 6b are provided.
[0022]
In addition, since the inner pattern coil 6a and the outer pattern coil 6b are formed as one pattern coil 6, the lead wire 13 can be connected at one location on each of the inner and outer circumferences, and the space at the connection location can be reduced and the work can be simplified. It is. The pattern coil 6 on the insulating film 5 is appropriately selected from known means such as conductive printing, etching, vapor deposition, sputtering, and application of coiled copper foil.
[0023]
Further, since the center pole 4a has a through hole, the end of the inner pattern coil 6a and the lead wire 13 can be connected through the through hole, so that wiring on the diaphragm 1 is possible. Therefore, the space of the diaphragm 1 can be effectively used.
[0024]
(Embodiment 2)
Another embodiment of the speaker of the present invention will be described with reference to a top view showing the outer shape of the diaphragm shown in FIG.
[0025]
According to the figure, reference numeral 8 denotes a diaphragm, and the difference from the diaphragm 1 of the first embodiment is that radial wrinkles 8a are provided (the configuration of the pattern coil is omitted from the figure). By providing these wrinkles 8a radially, the rigidity of the diaphragm 8 is improved and distortion is suppressed, and by providing these wrinkles 8a radially at substantially equal angles, the rigidity of the entire diaphragm is equalized and the vibration state is stable. However, the characteristics can be improved.
[0026]
In each of the above embodiments, each part of the speaker has been described as having a circular shape, but the same effect can be obtained with a rectangular shape.
[0027]
【The invention's effect】
As described above, the speaker of the present invention can provide a small, lightweight, and highly efficient speaker with improved sound pressure.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an embodiment of a speaker according to the present invention. FIG. 2 is a side sectional view for explaining the relationship between a diaphragm which is the main part and a magnetic circuit. FIG. 4 is a top view of a diaphragm which is a main part of a speaker according to another embodiment. FIG. 5 is an exploded perspective view of a conventional speaker. FIG. 6 is a top view of a diaphragm which is the main part. [Explanation of symbols]
1,8 Diaphragm 2 Plate 3 Hollow magnet 4 Yoke 4a Center pole 4b Plate frame 4c Inner magnetic gap 4d Outer magnetic gap 5 Insulating film 6 Pattern coil 6a Inner pattern coil 6b Outer pattern coil 8a Wrinkle

Claims (5)

A magnetic circuit comprising a yoke having an inner bottom surface provided with a plate frame on the periphery and having a center pole formed thereon, a magnet mounted around the center pole on the inner bottom surface, and a plate mounted on the magnet; A speaker comprising a diaphragm provided with a pattern coil on an insulating film provided on a magnetic circuit, wherein an outer peripheral magnetic gap is formed between the outer periphery of the magnet and the plate frame of the yoke, A speaker in which an inner circumferential magnetic gap is formed between a circumference and the center pole, and the winding direction of the pattern coil on the outer circumferential magnetic gap and the inner circumferential magnetic gap is reversed. The speaker according to claim 1, wherein each pattern coil having a winding direction opposite to each other is a continuous coil pattern. The speaker according to claim 1 or 2, wherein radial wrinkles are provided on the diaphragm. The speaker according to claim 3, wherein the radial wrinkles are provided at substantially equal angles. The center pole is provided with a through hole, and a lead wire for connection to the inner peripheral end of the pattern coil is wired from the bottom of the magnetic circuit portion through the through hole of the center pole. The speaker described.

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