JP2007295148A - Speaker structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker structure of high productivity enabling a thin formation of a magnet cover, being hardly deformed with easiness even when pushed by hand, and producing a high-class feeling. <P>SOLUTION: An elastomer member 20b is adhered to an external face of a metal plate member 20a formed in a cup shape; and there is formed a magnetic cover 20 having a folded portion 20c provided on the upper rim of the above elastomer member latched on the above metal plate member 20a, so as to cover magnetic circuits 1, 2, 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker structure, and more particularly to a speaker structure having a magnet cover.

  FIG. 4 shows the structure of a conventional speaker disclosed in Japanese Patent Application Laid-Open No. 11-1789091. The yoke 1, the magnet 2 and the top plate 3 shown in FIG. 4 are fixed so as to overlap with each other to form a magnetic circuit. A frame 4 is fixed to the top plate 3.

  The voice coil bobbin 5 around which the voice coil 5 a is wound is supported by the frame 4 via the damper 8 so that the voice coil 5 a is positioned in the magnetic gap between the yoke 1 and the top plate 3. The inner peripheral end of the diaphragm 6 is bonded to the voice coil bobbin 5, and the outer peripheral end is bonded to the edge 7. The outer peripheral portion of the edge 7 is fixed to the upper surface of the outer periphery of the frame 4.

  A gasket 11 that is in pressure contact with a speaker mounting plate (not shown) is fixed to the upper surface of the outer periphery of the frame 4. A dust cap 9 that covers the center hole of the diaphragm 6 is bonded to the diaphragm 6. A terminal plate 12 is attached to the frame 4, and a terminal provided on the frame 4 is connected to the voice coil 5 a by a tinsel wire 13.

  A magnet cover 20 made of an elastomer having an undercut portion 20d on the entire circumference (specifically, CSM, but in this specification, elastomer is a generic term for natural rubber or synthetic material having rubber elasticity) covers the magnetic circuit. ing. A vibration isolating material 21 made of an elastomer is fixed to the frame 4. In the above configuration, when an audio signal is applied to the terminal plate 12, the diaphragm 6 vibrates to emit sound.

  The magnet cover 20 has a function of improving the appearance of the speaker, but has almost no anti-vibration function for suppressing unnecessary vibration of the frame 4, and in order to prevent deterioration of sound quality due to vibration of the frame 4, a separate anti-vibration function is provided. The material 21 had to be fixed to the frame 4. For this reason, the number of parts and assembly man-hours have increased.

  Further, since the undercut portion 20d is forcibly pushed and covered with the magnetic circuit, the cylindrical portion 20f of the magnet cover 20 has to be thinned, the rigidity is reduced, and when pressed, it becomes dented and the quality of the product is impaired. It was.

  In recent years, a magnet cover that covers the bottom from the bottom of the frame has been used. An example of the structure of a speaker using such a magnet cover will be described with reference to FIG. The lower frame 4a and the upper frame 4b shown in FIG. The edge 7 is bonded to an edge seat 10 fixed to the frame 4.

  The damper 8 is bonded to a damper seat 4c formed on the lower frame 4a. The magnet cover 20 made of elastomer extends until it comes into contact with the damper seat 4 c, and the pressure contact portion 20 e at the upper end is in pressure contact with the frame 4. An undercut portion 20 d of the magnet cover 20 holds the upper end of the magnet 2. The magnet cover 20 is attached to the magnetic circuit by this locking force and adhesive. The other configuration is the same as that of the speaker shown in FIG. 4, and members having the same function are denoted by the same reference numerals and detailed description thereof is omitted.

  Since the magnet cover 20 used in the structure of the speaker is pressed against the frame 4, it has a function of suppressing unnecessary vibration of the frame 4. However, in order to obtain a sufficient pressure contact force, it must be formed thick. Therefore, the undercut portion 20d is partially provided on the circumference so that the molded product can be removed from the mold. However, when the molded product is removed from the mold, there is a problem that the undercut portion may be cut off from the undercut portion. It was. Moreover, it took time and effort to cover the magnetic circuit. Furthermore, because of the thick wall, the molding time is increased, the material is increased, and there is an adverse effect on productivity and manufacturing cost.

A magnet cover may be made of a molded resin product such as ABS. However, since the resin does not have rubber elasticity, the anti-vibration performance is poor, and unnecessary vibration is transmitted from the magnetic circuit to the frame, generating unnecessary vibration and sound quality. Was deteriorating. In addition, when used for a high power subwoofer or the like, the magnet cover may be deformed by heat.
JP-A-11-1789091, paragraphs 0011 to 0012, FIG.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a loudspeaker structure capable of obtaining high sound quality by suppressing unnecessary vibration of a frame.

  Another object of the present invention is to provide a loudspeaker structure in which a magnet cover can be formed thin, has high productivity, and does not easily deform even when pushed by hand, and can provide a high-class feeling.

  Furthermore, another object of the present invention is to provide a speaker structure that is not deformed by heat even when used in a high-power subwoofer or the like.

  In the speaker structure of the present invention, the cup-shaped elastomer member is brought into close contact with the outer surface of the cup-shaped metal plate member, and the folded portion provided on the upper edge of the elastomer member is locked to the upper edge of the metal plate member. A magnetic cover is configured to cover the magnetic circuit.

  In the speaker structure, the elastomer member is insert-molded on the metal plate member.

  In the speaker structure of the present invention, the cup-shaped elastomer member is brought into close contact with the outer surface of the cup-shaped hard plastic member, and the folded portion provided on the upper edge of the elastomer member is engaged with the upper edge of the hard plastic member. The magnetic circuit is configured to be covered with a magnet cover that is stopped.

  In each speaker structure, the upper edge of the elastomer member is pressed against the speaker frame by fastening the magnet cover to a yoke of a magnetic circuit.

  In the structure of each speaker, the magnet cover is formed by a flat bottom surface and a body portion that rises in a conical shape from the bottom surface, and an uneven portion is provided on the body portion.

  According to the structure of the speaker of the present invention, high sound quality can be obtained by suppressing unnecessary vibration of the frame. In addition, the magnet cover can be formed thin, and the productivity is high, and it is not easily deformed even if it is pushed by hand, and a high-class feeling can be obtained.

  The best mode for carrying out the present invention will be described below with reference to examples.

  1 is a cross-sectional view showing the structure of a speaker according to Embodiment 1 of the present invention. The magnet cover 20 shown in FIG. 1 covers a metal member 20a formed of a cup-shaped iron plate with a cup-shaped rubber member 20b, and a folded portion 20d formed at the upper end of the rubber member 20b is engaged with the upper edge of the metal member 20a. It is configured to stop.

  Holes are provided at four circumferentially equidistant positions on the bottom surface of the magnet cover 20, and screws 14 passing through the holes are screwed into the screw holes of the yoke 1 so that the magnet cover 20 is fastened to the magnetic circuit, and the rubber member 20b. The pressure contact portion 20 c is in pressure contact with the damper seat 4 c of the frame 4. Other configurations are the same as those of the speaker shown in FIG. 5, and members having the same functions are denoted by the same reference numerals and detailed description thereof is omitted.

  In this embodiment, even if the metal member 20a and the rubber member 20b are thin, sufficient rigidity is obtained by the metal member 20a, and the entire magnet cover 20 is thin, so that the manufacturing cost can be reduced. Further, since the pressure contact portion 20c of the rubber member 20b having rubber elasticity is pressed against the frame 4, unnecessary vibration of the frame 4 is suppressed and sound quality is improved. Moreover, since the part which contacts the magnetic circuit of the magnet cover 20 is an iron plate, it has high heat resistance and is not deformed by heat even when used in a high power speaker.

  2 is a perspective view showing a magnet cover used in the structure of a speaker according to Embodiment 2 of the present invention, FIG. 3 (a) is a plan view showing the magnet cover, and FIG. 3 (b) is in FIG. 3 (a). It is AA sectional drawing.

  The magnet cover 20 shown in FIGS. 2 and 3 is formed by covering a metal member 20a formed by cup-shaped aluminum die casting by rubber member 20b insert molding. The body portion of the magnet cover 20 is provided with four irregularities, whereby the rigidity of the magnet cover 20 is enhanced.

  Holes are provided at four circumferentially equidistant positions on the bottom surface of the magnet cover 20, and screws through the holes are screwed into screw holes of the yoke 1 similar to those shown in FIG. The pressure contact portion 20c of the rubber member 20b is pressed against a damper seat 4c of the frame 4 similar to that shown in FIG. Other configurations are the same as those of the speaker shown in FIG.

  In this embodiment, since the magnet cover 20 is integrally formed, the number of parts and assembly man-hours are reduced. And the effect similar to Example 1 is acquired.

  Although the embodiment is configured as described above, the invention is not limited to this. For example, even if a magnet cover in which a hard plastic member is covered with a rubber member is used, an anti-vibration effect of the frame can be obtained. Play.

It is sectional drawing which shows the structure of the speaker which is Example 1 of this invention. It is a perspective view which shows the member used for the structure of the speaker which is Example 2 of this invention. FIG. 3A is a plan view showing the member, and FIG. 3B is a cross-sectional view taken along line AA in FIG. It is a half sectional view showing an example of the structure of a conventional speaker. It is sectional drawing which shows the other example of the structure of the conventional speaker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Yoke 2 Magnet 3 Top plate 4 Frame, 4a Lower frame, 4b Upper frame, 4c Damper seat 5 Voice coil bobbin, 5a Voice coil 6 Diaphragm 7 Edge 8 Damper 9 Dust cap 10 Edge seat 11 Gasket 12 Terminal board 13 Kinshi wire 14 Screw 20 Magnet cover, 20a Metal plate member, 20b Rubber member, 20c Folded part, 20d Undercut part, 20e Pressure contact part, 20f Cylindrical part 21 Vibration isolator

Claims (5)

A magnetic circuit is formed by a magnet cover in which a cup-shaped elastomer member is brought into close contact with an outer surface of a cup-shaped metal plate member and a folded portion provided on the upper edge of the elastomer member is engaged with the upper edge of the metal plate member. A speaker structure characterized by covering. The speaker structure according to claim 1, wherein the elastomer member is insert-molded on the metal plate member. A magnetic circuit is formed by a magnet cover in which a cup-shaped elastomer member is brought into close contact with an outer surface of a hard plastic member formed in a cup shape, and a folded portion provided on the upper edge of the elastomer member is engaged with the upper edge of the hard plastic member. A speaker structure characterized by covering. 4. The speaker structure according to claim 1, wherein the upper edge of the elastomer member is pressed against the speaker frame by fastening the magnet cover to a yoke of a magnetic circuit. The speaker structure according to any one of claims 1 to 4, wherein the magnet cover is formed by a flat bottom surface and a body portion that rises conically from the bottom surface, and an uneven portion is provided on the body portion.

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