JP2007259196A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain widening of the playback band of high-pitched sounds, regarding a speaker for high-pitched sound playback mounted on an acoustic instrument. <P>SOLUTION: In the speaker, a void-repulsing spacer 5 is arranged between a diaphragm 3 and a center pole part 1e, and a void 6 between the diaphragm 3 and the void-repulsing spacer 5 is made into fine voids of approximately equal intervals. Thus, by fixing the air spring pressure of the void 6 and suppressing the deformation of the diaphragm 3 at driving, a high-pitched sound playback band is realized, thereby providing a high-performance high-pitched sound playback speaker. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker used in various audio equipment, and more particularly to a speaker suitable for high-frequency range reproduction.

  In recent years, there are many audio playback devices such as DVDs and Super CDs whose high-frequency recording bandwidth reaches 100 kHz, and audio playback devices can sufficiently play back up to 100 kHz. . Therefore, there is an increasing demand for a loudspeaker, which is a sound reproducing device, to expand the high-frequency range reproduction band as much as possible.

  A conventional loudspeaker speaker will be described with reference to a side sectional view of FIG. According to the figure, reference numeral 1 is composed of a lower plate 1a having a center pole portion 1e, an annular magnet 1b adhesively bonded thereon, and an annular upper plate 1c superimposed and adhesively bonded thereon, 2 is a magnetic circuit in which a magnetic gap 1d is formed between the outer periphery of the center pole portion 1e and the inner periphery of the upper plate 1c, 2 is a frame that is adhesively bonded to the upper plate 1c, and 3 is a dome-shaped center portion. The outer periphery of the diaphragm 3 is adhesively bonded to the frame 2 via an edge portion 3a, and the voice coil fitted into the magnetic gap 1d is attached to the lower part 3b of the dome-shaped diaphragm 3. The other end of 4 is adhesively bonded.

  As described above, the loudspeaker speaker is configured. However, as a diaphragm material of the loudspeaker for high sound reproduction, which is a main member, metal materials such as aluminum and titanium, PEN (polyethylene naphthalate), PI (polyimide) are used. ), Etc., and fabric materials woven with silk fibers and polyester fibers and rubber-coated.

  As for the cloth material, it is often used for low distortion. If anything, it is used for medium to high sound range reproduction and has a purpose slightly different from other materials.

For example, Patent Document 1 is known as prior art document information of a speaker related to the invention of this application.
Japanese Patent Laid-Open No. 5-168079

  As described above, the above three types of materials are often used as diaphragm materials that take into consideration the sound speed, high rigidity, light weight, workability, cost, etc. required for the diaphragm 3 of the loudspeaker reproduction speaker.

  In addition, there is a beryllium material that emphasizes the speed of sound and improves the high frequency range reproduction band, but there is a problem in manufacturability etc., and it is expensive so that it can only be used for some super high-end audio, and it was not common .

  Incidentally, the speed of sound indicates one factor of the diaphragm material. Generally, the larger the numerical value of the speed of sound, the easier the band to be expanded.

  FIG. 6a shows the sound pressure frequency characteristics of this conventional high-frequency range reproduction speaker.

  Note that b represents the second harmonic distortion, and c represents the third harmonic distortion.

  As a conventional method for expanding the high frequency range reproduction band, as described above, improvement is made by improving the physical property value of the diaphragm itself, such as sound speed, high rigidity, and weight reduction of the diaphragm itself, or driving force. Improving the connection with the voice coil has been a common solution.

  However, the method of joining the diaphragm and the voice coil using a special method is not stable in terms of quality, so it is generally handled by improving the physical properties of the diaphragm material. Enormous costs and days are required, and at the present stage both the above-mentioned methods have the problem of a significant increase in cost.

  The present invention solves the above-mentioned problems and makes it possible to provide a high-frequency reproduction speaker excellent in performance at a low cost without changing the manufacturing process.

  In order to solve the above-described problems, a speaker according to the present invention includes a dome-shaped diaphragm having a voice coil attached to at least a lower inner periphery, a magnetic circuit having a magnetic gap in which the voice coil is disposed, and an edge. The diaphragm is bonded to the outer periphery of the diaphragm, and is a speaker including a frame coupled to the upper plate. The speaker is substantially the same as the dome-shaped diaphragm in the space between the diaphragm and the magnetic circuit. A gap repelling spacer is arranged so as to provide a gap having a gap.

  In the speaker of the present invention, an air gap repelling spacer is disposed between the speaker's dome-shaped diaphragm and the magnetic circuit, thereby providing substantially equal gaps between the vibration plate and the air gap repelling spacer. Due to the gap of the gap, the inherent deflection of the diaphragm caused by the vertical amplitude of the diaphragm is held down by the air spring that is uniformly generated by the gap, and the dome-shaped part of the diaphragm is made to vibrate with the piston motion of the vertical amplitude, and the high sound range The reproduction band can be expanded.

  An embodiment of the present invention will be described below with reference to FIGS. 1 (a) to 4 (c). The same parts as those in the prior art will be described with the same numbers.

(Embodiment 1)
An embodiment of the present invention will be described with reference to FIGS. 1 (a) to 3 (b). The present embodiment mainly explains the invention according to claims 1 to 5 and claim 10, and FIG. 1 (a) is a side of a loudspeaker reproducing speaker according to an embodiment of the present invention. FIG. 1B is a partial enlarged view of the dome-shaped diaphragm and gap repelling spacer illustrated by A which is the main part, FIG. 2 is a sound pressure frequency characteristic diagram, and FIG. FIG. 3A is a side cross-sectional view of a loudspeaker reproducing speaker of the same development example, and FIG. 3B is a side sectional view of a loudspeaker reproducing speaker of the other development example.

  1 (a) and 1 (b), reference numeral 1 denotes a lower plate 1a having a center pole portion 1e, an annular magnet 1b adhesively bonded thereon, and an upper plate superposed and adhesively bonded thereon. 1c, a magnetic circuit in which a magnetic gap 1d is formed between the outer periphery of the center pole portion 1e and the inner periphery of the upper plate 1c, 2 is a frame adhesively coupled to the upper plate 1c, and 3 is a dome. The diaphragm 3 is a resin-molded diaphragm having a center portion, and the outer periphery of the diaphragm 3 is adhesively bonded to the frame 2 via an edge portion 3a, and the lower portion 3b of the dome-shaped diaphragm 3 The other end of the voice coil 4 fitted in the magnetic gap 1d is adhesively bonded.

  Reference numeral 5 denotes a space repulsion spacer formed by resin molding bonded and bonded to the center pole portion 1e. The upper portion is spherical so as to have a space 6 that is substantially equidistant from the central dome-shaped portion of the diaphragm 3. Is formed. Reference numeral 7 denotes a magnetic fluid disposed between the magnetic gaps 1d by coating or the like, whereby the gap 6 between the diaphragm 3 and the gap repelling spacer 5 is substantially sealed.

  The gap 6 is desirably narrow as long as it does not hinder the vertical movement of the diaphragm 3 during sound emission, but is optimally about 0.5 to 2.0 mm.

  The sound pressure frequency characteristic d of the speaker in the above embodiment is shown in FIG. e represents the second harmonic distortion, and f represents the third harmonic distortion. Compared with the sound pressure frequency characteristics of the conventional speaker in FIG. 6, the characteristics are flatter, the reproduction band is expanded, the frequency characteristics and distortion are smoothly improved, and it is excellent as a loudspeaker. It was confirmed that there was.

  This is because the air spring pressure in the air gap 6 becomes substantially uniform and the deformation during driving of the diaphragm 3 is suppressed by making the air gap 6 uniform and narrow by mounting the air gap repelling spacer 5. it is conceivable that. As a result of analyzing the vibration motion of the diaphragm 3 using the vibration analysis simulation and the laser vibration mode analyzer in the present embodiment, the variation at the dome apex portion of the diaphragm 3 is reduced compared to the conventional product, and the vibration is reduced. It was confirmed that the plate itself was not deformed and was oscillating with piston motion.

  The air gap repelling spacer 5 may be made of any material as long as it does not impair the uniformity of the air spring pressure of the air gap 6, but a resin or a polycarbonate or liquid crystal polymer that is relatively hard and heat resistant. In terms of current control, copper is preferable from the viewpoint of current control. Moreover, when using a ceramic material, since the surface has many fine holes, it is desirable to coat the surface with a sealing material or the like.

  In addition, it is a matter of course that the vibration plate 3 is made of a metal having high rigidity and little deformation, but a resin molded product or a film molded product having a high rigidity can obtain a sufficient effect. I can.

  The cloth diaphragm is effective because the cloth itself is low in rigidity, but it cannot be expected to be as great as that made of metal or resin. It should be selected accordingly.

  In the present embodiment, the magnetic fluid 7 is disposed between the magnetic gaps 1d by coating or the like, but this suppresses fluctuations due to the release of the pressure of the air spring in the space 6 by improving the sealing performance. Since it is an object, the magnetic fluid 7 may not be applied if the speaker characteristics are satisfactory.

  Hereinafter, a development example of the present embodiment will be described with reference to FIGS. 3 (a) and 3 (b).

(Development example 1)
FIG. 3A is a side sectional view of the speaker of the development example, and only differences from the present embodiment will be described. The difference is in the coupling configuration of the lower plate 1f having the center pole portion and the air gap repelling spacer 5a. In addition, a concave portion 1h is provided on the upper surface of the center pole portion 1g of the lower plate 1f, and a convex portion 5b fitted into the concave portion 1h is provided on the lower surface of the air gap repelling spacer 5a.

  With this configuration, the space repulsion spacer 5a can be stably fixed to the center pole portion 1g, and the space repulsion spacer 5a is not eccentric, resulting in non-uniform spacing of the space 6. Further, the air gap repelling spacer 5a can be easily fixed to the center pole portion 1g.

  Note that the uneven structure may be provided on either side of the air gap repelling spacer 5a or the center pole portion 1g, and the quantity, position, etc. can be set as appropriate.

(Development example 2)
FIG. 3 (b) is a side sectional view of a speaker of another development example. The difference from the present embodiment is the structure of the air gap repelling spacer 1j and the lower plate 1i, and the center pole portion of the lower plate 1i is The gap repelling spacer 1j is integrally formed by stretching. Since the lower plate 1i is generally made of a magnetic metal such as iron, it can be easily manufactured by known manufacturing means such as cutting and forging.

  As a result, it is possible to eliminate the displacement at the time of mounting the lower plate 1i and the air gap repulsion speaker 1j more accurately than the above-described development example, and it is possible to manufacture the speaker without increasing the number of steps and the number of parts at the time of manufacturing the speaker. It will be.

(Embodiment 2)
4A is another embodiment of the speaker of the present invention, FIG. 4B is a side sectional view of the speaker of the same development example, and FIG. 4C is a speaker of the other development example. FIG. 6 is a side sectional view mainly illustrating the sixth to ninth aspects.

  Although the first embodiment is a magnetic circuit having an outer magnet type (a magnet having an annular shape), this embodiment has an inner magnet type (a magnet having a cylindrical shape). The description will focus on the configuration of the magnetic circuit, which is a magnetic circuit and is different from the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  According to FIG. 4 (a), reference numeral 10 denotes an inner magnet type magnetic circuit. The yoke 10a, a columnar magnet 10b adhesively bonded to the center of the inner bottom of the yoke 10a, and adhesively bonded on the magnet 10b. It is composed of a disc-shaped upper plate 10c. Reference numeral 10d denotes a magnetic gap formed between the inner surface of the yoke 10a and the outer peripheral surface of the upper plate 10c, and the other end of the voice coil 4 is disposed.

  Reference numeral 11 denotes a space repulsion spacer formed by resin molding which is adhesively bonded on the upper plate 10c. The upper portion has a spherical shape so as to have a space 6 that is substantially equidistant from the central dome-shaped portion of the diaphragm 3. Is formed.

  The speaker formed as described above is different in the configuration of the magnetic circuit from that of the speaker of the first embodiment, but the relationship between the diaphragm 3 and the air gap repelling spacer 11 is the same. In the speaker of the present embodiment, too. It is possible to provide a broadband speaker in a high sound range.

  The materials used for the air gap repelling spacer 11 and the diaphragm 3 are the same as those in the first embodiment, and a description thereof will be omitted.

(Development example 1)
FIG. 4B is a development example of the present embodiment, and the difference from the present embodiment lies in the configuration of the adhesive coupling portion between the air gap repelling spacer and the upper plate, and FIG. 3A of the first embodiment. This corresponds to the first development example.

  In FIG. 4B, only the difference from the present embodiment will be described. The difference is that a concave portion 10f is provided on the upper surface of the upper plate 10e, and a convex portion 11b fitted into the concave portion 10f is provided on the lower surface of the air gap repelling spacer 11a. That is.

  With this configuration, it is possible to stably fix the gap repelling spacer 11a to the upper plate 10e, without causing the non-uniformity of the gap 6 caused by the eccentricity of the gap repelling spacer 11a. The gap repelling spacer 11a can be easily fixed to the upper plate 10e. The uneven structure may be provided on either side of the air gap repelling spacer 11a or the upper plate 10e, and the quantity, position, etc. can be set as appropriate.

(Development example 2)
FIG. 4C is a side sectional view of a speaker of another development example. The difference from the present embodiment is the configuration of a space repulsion spacer and an upper plate, and the space repulsion spacer 11f is integrated with the upper plate 10g. Is formed. Since the upper plate 10g is generally made of a magnetic metal such as iron, it can be easily manufactured by known manufacturing means such as cutting and forging.

  As a result, it is possible to eliminate the displacement at the time of mounting the upper plate 10g and the air gap repulsion speaker 11f with higher accuracy than the above-described development example, and it is possible to manufacture the speaker without increasing the number of steps and the number of parts when manufacturing the speaker. It will be.

  In the speaker according to the present invention, by providing a substantially uniform air gap between the vibration plate and the air gap repelling spacer, the vibration inherent to the vibration plate is pressed down by an air spring that is uniformly generated by the air gap, and the vibration plate It is possible to provide a loudspeaker for a high sound range in which a dome-shaped portion can be oscillated with a piston motion and the reproduction band is expanded.

(A) Side sectional view in one embodiment of the speaker of the present invention, (b) Enlarged sectional view of the main part Same sound pressure frequency characteristics (A) Side sectional view of the same development example, (b) Side sectional view of the other development example. (A) Side sectional view of the speaker in the other embodiment, (b) Side sectional view of the development example, (c) Side sectional view of the other development example Side view of a conventional speaker Same sound pressure frequency characteristics

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic circuit 1a, 1f, 1i Lower plate 1b Annular magnet 1c Upper plate 1d Magnetic gap 1e, 1g Center pole part 1h, 10f Concave part 2 Frame 3 Diaphragm 4 Voice coil 5, 5a, 1j Air gap repelling spacer 5b, 11b Convex part 6 Gap 10 Magnetic circuit 10a Yoke 10b Magnet 10c, 10e, 10g Upper plate 10d Magnetic gap 11, 11a, 11f Gap repulsion spacer

Claims (10)

At least the dome-shaped diaphragm having a voice coil attached to the lower part of the inner periphery, a magnetic circuit having a magnetic gap in which the voice coil is disposed, and the outer periphery of the diaphragm are adhesively bonded via an edge, A speaker comprising a frame coupled to a magnetic circuit, wherein a space-repelling spacer is disposed in the space between the diaphragm and the magnetic circuit so as to provide a space that is substantially equidistant from the dome-shaped diaphragm. . The speaker according to claim 1, wherein a magnetic fluid is disposed between the voice coil and the magnetic circuit. The speaker according to claim 1, wherein the magnetic circuit is formed by a lower plate having a center pole portion, an annular magnet coupled to the lower plate, and an annular upper plate coupled to the magnet. The speaker according to claim 3, wherein a gap repulsion spacer is mounted on the center pole portion. The speaker according to claim 4, wherein a convex portion or a concave portion is provided at a lower portion of the air gap repelling spacer and is fitted into the concave portion or the convex portion provided in the center pole portion. The speaker according to claim 1, wherein the magnetic circuit is formed of a yoke, a cylindrical magnet coupled on the yoke, and an upper plate coupled on the magnet. The speaker according to claim 6, wherein a gap repulsion spacer is mounted on the upper plate. The speaker according to claim 7, wherein a convex portion or a concave portion is provided at a lower portion of the air gap repelling spacer and is fitted into the concave portion or the convex portion provided on the upper plate. The speaker according to claim 6, wherein the air gap repelling spacer is formed integrally with the upper plate. The speaker according to any one of claims 1 to 9, wherein the air gap repelling spacer is made of any one of a metal material, a ceramic material, or a resin material, and the diaphragm is made of any one of a metal material, a resin material, or a cloth material. .

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