JP2006254038A - Method of manufacturing speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a speaker having no generation of magnetic leakage by solving the problem that a gap is generated on each of corners of a yoke of a speaker to be used for a cellular phone etc. , resulting in magnetic leakage. <P>SOLUTION: In this manufacturing method, a plate material is taper-worked into a vase-like rectangular shape and the external periphery of each corner is press-worked to form a yoke 1 provided with a tongue-like flange 1a protruding from a position lower by a predetermined dimension from the top end surface to the outside, the yoke 1 is insertion-molded on a resin-made frame 2 so as to cover the flange 1a, a magnet 3 is bonded into the inside of the yoke 1 to form a magnetic circuit having a magnetic gap 5 formed thereon, and a diaphragm 6 having a voice coil 7 joined thereto is joined to the frame 2. By this manufacturing method, coupling strength between the yoke 1 and the frame 2 is improved and reducing the speaker in height, and the gap is not formed on each corner of the yoke to eliminate the magnetic leakage. Thus, the speaker excellent in quality and performance can be stably manufactured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method of manufacturing a small, thin and rectangular speaker used for various applications in which it is difficult to secure a speaker mounting space, such as a mobile phone, among speakers used in various audio equipment and information communication equipment. It is.

  Speakers used for various types of audio equipment and information communication equipment are becoming smaller and more compact than ever, especially in speakers used for mobile phones. Sound quality has also been demanded. In such a background, as a speaker for a mobile phone in which it is difficult to secure a speaker mounting space, a rectangular speaker is more than a general circular speaker from the viewpoint of more effectively using a limited space. The emphasis is on the development of

  FIG. 6 is a cross-sectional view showing the configuration of this type of conventional speaker, FIG. 7 is a perspective view showing the configuration of a yoke used in the speaker, and in FIGS. 6 and 7, 11 is a yoke. The yoke 11 is formed into a bottomed and rectangular frame shape by bending and forming four bent raised portions 11a on a sheet-like magnetic metal material that has been previously cut out of the shape. Thus, the material loss of the yoke 11 is reduced and the productivity is improved. Reference numeral 12 denotes a rectangular magnet, and reference numeral 13 denotes a rectangular upper plate, which constitutes a magnetic circuit in which a rectangular magnetic gap 14 is formed by laminating and coupling them in the yoke 11. is there.

  Reference numeral 15 denotes a frame in which the yoke 11 is press-fitted for coupling with the magnetic circuit, and is coupled with an adhesive interposed therebetween. Reference numeral 16 denotes a voice coil provided so as to fit into the magnetic gap 14, and reference numeral 17 denotes a diaphragm having the voice coil 16 coupled to the center and a peripheral edge coupled to the peripheral edge of the frame 15.

  In the conventional speaker configured as described above, when a voice signal is input to the voice coil 16 fitted in the magnetic gap 14, the voice coil 16 swings up and down by the magnetic field generated from the magnetic gap 14. The diaphragm 17 to which the voice coil 16 is coupled is configured so as to perform sound reproduction with an amplitude in the vertical direction.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2003-37892 A

  However, in the above conventional speaker manufacturing method, the yoke 11 constituting the magnetic circuit is manufactured by bending one magnetic metal material, so that there is a gap at each corner of the rectangular yoke 11. Therefore, not only does this cause a magnetic leakage from this gap, leading to a decrease in performance such as a decrease in sound pressure due to a decrease in magnetic flux density, but also leakage to other electronic components that are densely mounted around the speaker. The problem was that there was a possibility of causing a serious problem that the magnetism had an adverse effect.

  An object of the present invention is to solve such a conventional problem, and to provide a speaker manufacturing method capable of stably manufacturing a speaker excellent in quality and performance without occurrence of magnetic leakage. is there.

  In order to solve the above-mentioned problems, the present invention draws a flat magnetic metal material into a rectangular saddle shape and subsequently presses the peripheral edge of the upper end surface of each corner portion downward from the upper end surface. A step of producing a yoke integrally provided with a tongue-like flange projecting outward from a position of a predetermined dimension, and a tongue-like flange formed on the yoke is covered. A step of insert-molding the yoke into a resin frame, a step of manufacturing a magnetic circuit in which a magnet is joined in the yoke to form a magnetic gap, and a voice coil driven by a magnetic field generated from the magnetic gap. The method comprises a step of joining to the diaphragm and a step of joining the diaphragm to which the voice coil is joined to the frame.

  As described above, according to the present invention, at least each tongue portion is provided with a tongue-like collar portion that protrudes outward from a position that is a predetermined dimension lower than the upper end surface of the yoke. With the manufacturing method in which the yoke is insert-molded into a resin frame so that the cover is covered, not only the joint strength of the yoke and the frame is greatly improved, but also a low profile can be achieved. By manufacturing the yoke in the shape of a saddle, there are no gaps at each corner, which makes it possible to stably manufacture a speaker with excellent quality and performance by eliminating magnetic leakage completely. An effect is obtained.

(Embodiment 1)
Hereinafter, the first aspect of the present invention will be described with reference to the first embodiment.

  1 is a cross-sectional view showing a configuration of a speaker obtained by the speaker manufacturing method according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view showing a frame in which a yoke used for the speaker is insert-molded, and FIG. 3 (a) to 3 (c) are a plan view, a front sectional view and a side sectional view showing a yoke used in the speaker. In FIGS. 1 to 3, reference numeral 1 denotes a yoke, and the yoke 1 is a magnetic metal. A tongue-shaped flange 1a that is formed in a rectangular bowl shape using a material and protrudes outward from a position that is lower than the upper end surface of the yoke 1 by a predetermined dimension is provided for each corner part and long The configuration is provided symmetrically on the side.

  2 is a resin frame, 2a is a vent hole provided in the frame 2, and the frame 2 covers the tongue-shaped flange 1a provided in the yoke 1 so that the frame 2 is The yoke 1 is insert-molded at the time of molding, and the bottom of the yoke 1 protrudes from the bottom of the frame 2 after the insert molding. This makes it possible to easily perform operations such as printing and stamping for the display.

  A magnet 3 is coupled to the inside of the yoke 1, and an upper plate 4 is coupled to the upper portion of the magnet 3, thereby forming a magnetic circuit having a magnetic gap 5.

  Reference numeral 6 denotes a diaphragm having an edge 6a integrally formed on the outer periphery, and 7 is a voice coil coupled to the center of the diaphragm 6. The voice coil 7 is fitted in a magnetic gap 5 formed in the magnetic circuit. Thus, when a voice signal is input to the voice coil 7, the voice coil 7 is caused to swing up and down by a magnetic field generated from the magnetic gap 5, and the diaphragm 6 coupled with the voice coil 7 is configured. Also, the sound reproduction is performed with amplitude up and down. Reference numeral 8 denotes a cover for protecting the diaphragm 6.

  4A to 4F are manufacturing process diagrams showing the manufacturing method of the yoke 1. First, as shown in FIG. 4A, a plate made of a magnetic metal material is formed into a rectangular shape having a predetermined size. Punching process. Next, as shown in FIG. 4B, this rectangular plate material is drawn into a saddle shape having a concave cross section by press working.

  Next, as shown in FIG. 4 (c), the peripheral edge of the upper end surface of the molded body formed into a rectangular saddle shape is pressed downward so as to move outward from a position where a predetermined dimension is lowered from the upper end surface. The ridge part which protrudes toward is formed integrally. Next, as shown in FIG. 4 (d), at least only the collar portion formed at each corner portion of the collar portion is left, and other unnecessary portions are removed by punching.

  Next, as shown in FIG.4 (e), the remaining collar part is pressed again and processed into desired thickness. Finally, as shown in FIG. 4 (f), an unnecessary portion of the outer shape of the collar portion is removed by punching to produce the yoke 1 integrally provided with the tongue-shaped collar portion 1a.

  The flange 1a provided integrally with the yoke 1 may be provided over the entire outer periphery of the yoke 1. However, it is not necessary to provide a flange that protrudes outward by pushing a very small dimension. Difficult, the material may not be sufficiently stretched and may be partially broken in the middle, so the configuration such as partially symmetrical on each corner or long side is the most effective and has good productivity Therefore, the shape as shown in this embodiment is selected.

  The speaker using the yoke 1 according to the present embodiment manufactured as described above is provided with a tongue-like flange portion 1a that protrudes outward from a position that is a predetermined dimension lower than the upper end surface of the yoke 1, By adopting a method in which the yoke 1 is insert-molded into the frame 2 so as to cover the flange portion 1a, not only the joint strength between the yoke 1 and the frame 2 is greatly improved, but also the height can be reduced. In addition, since the rectangular yoke 1 is formed in a bowl shape, there are no gaps at each corner, thereby making it possible to stably produce a speaker with excellent quality and performance by completely eliminating magnetic leakage. The special effect of becoming.

(Embodiment 2)
Hereinafter, the invention described in the second to fourth aspects of the present invention will be described using the second embodiment.

  In the present embodiment, the configuration of the voice coil used in the speaker described in the speaker manufacturing method according to the first embodiment is different, and the other configuration is the same as that of the first embodiment. The same parts are denoted by the same reference numerals and detailed description thereof is omitted, and only different parts will be described below with reference to the drawings.

  FIG. 5 is a cross-sectional view showing the structure of a speaker obtained by the speaker manufacturing method according to Embodiment 2 of the present invention. In FIG. 5, 9 is a voice coil, and this voice coil 9 is a resin base material. The coils having a desired pattern are respectively formed in a wound state on the front and back surfaces.

  Reference numeral 10 denotes a diaphragm having an edge 10a integrally provided on the outer periphery. A base material excluding the coil of the voice coil 9 is coupled to the center of the diaphragm 10, and the voice coil 9 is magnetically disposed above the magnetic gap 5. The gap 5 is arranged so as to be close to the gap 5 in a non-contact state.

  The speaker according to the present embodiment thus manufactured and configured as described above, like the speaker according to the first embodiment described above, completely eliminates magnetic leakage and stabilizes a speaker excellent in quality and performance. In addition to the effect that the voice coil 9 can be manufactured, the weight of the voice coil 9 can be reduced to contribute to further performance improvement, and the shape of the voice coil can be easily changed, so that the installation space is limited. However, it is possible to obtain a special effect that it is possible to manufacture a speaker corresponding to any shape.

  The speaker manufacturing method according to the present invention has an effect that a speaker excellent in quality and performance can be stably manufactured by completely eliminating magnetic leakage, and is used in information communication equipment such as a mobile phone. It is useful as a manufacturing method for the above.

Sectional drawing which showed the structure of the speaker obtained by the manufacturing method of the speaker by Embodiment 1 of this invention Sectional view showing a frame insert-molded with a yoke used for the speaker (A) Plan view showing a yoke used for the speaker, (b) Front sectional view, (c) Side sectional view (A)-(f) Manufacturing process figure which showed the manufacturing method of the yoke used for the speaker Sectional drawing which showed the structure of the speaker obtained by the manufacturing method of the speaker by Embodiment 2 of this invention Sectional view showing the structure of a conventional speaker The perspective view which showed the yoke used for the speaker

Explanation of symbols

1 yoke 1a collar 2 frame 2a vent 3 magnet 4 upper plate 5 magnetic gap 6, 10 diaphragm 6a, 10a edge 7, 9 voice coil 8 cover

Claims (4)

A flat magnetic metal material is drawn into a rectangular bowl, and then at least the periphery of the upper end surface of each corner is pressed downward to move outward from a position that is a predetermined dimension lower than the upper end surface. And a step of producing a yoke integrally provided with a tongue-shaped flange portion protruding in a protruding manner, and insert-molding the yoke into a resin frame so that the tongue-shaped flange portion formed on the yoke is covered. A step of manufacturing a magnetic circuit having a magnetic gap formed by bonding a magnet in the yoke, a step of bonding a voice coil driven by a magnetic field generated from the magnetic gap to the diaphragm, and the voice coil A method for manufacturing a speaker comprising: a step of bonding a diaphragm bonded with a frame to a frame. 2. The speaker manufacturing method according to claim 1, wherein a voice coil having a configuration in which a coil having a desired pattern is formed in a wound state on at least one surface of a resin base material. The method for manufacturing a speaker according to claim 2, wherein the diaphragm is formed of resin, and a base material excluding the coil of the voice coil is coupled to the center of the resin diaphragm. 4. The method for manufacturing a speaker according to claim 3, wherein a voice coil is disposed close to the magnetic gap in a non-contact state with the magnetic gap.

Images