JP4549285B2 - Speaker frame and speaker using the frame - Google Patents

Description

  The present invention relates to a speaker frame that has been reduced in weight and a speaker using the frame, and more particularly, to a combined configuration of a frame and a magnetic circuit in a speaker in which a diaphragm, a voice coil, and a magnetic circuit are unitized with a lightweight frame.

  In reducing the weight of speakers, frames that are easier to reduce than diaphragms and magnetic circuits are mainly targeted for weight reduction, and in terms of materials, light metals such as magnesium, aluminum, and their alloys with a specific gravity of 3.0 or less. Alternatively, a resin is used, and the resin is mainly used in terms of the degree of freedom of shape by molding. On the other hand, in terms of structure, it is advantageous to make the frame as thin as possible in order to reduce the weight, and in the case of metal or resin, the frame can be thinned within a range that does not exceed the limit that can ensure the required strength. Generally, the frame consists of a disk part that holds the magnetic circuit at the center, a radiating part that spreads around the cone-shaped diaphragm from the outer periphery of the disk part, and an edge part that holds the outer periphery of the diaphragm on the outer periphery of the radiating part. The radiation part is reduced in weight by expanding the sound hole to increase the aperture ratio, or by connecting the disk part and the edge part with a linear or curved radiation beam or a combination radiation beam. In the present situation, the disk portion is reduced mainly by thinning and its thickness is generally in the range of 0.5 mm to 1.5 mm. However, there are various problems to combine such a thin frame disk part with a magnetic circuit with high specific gravity and heat generation during operation, and various measures have been proposed. ing.

  To connect the magnetic circuit and thin frame, including the inner and outer magnet types, either a mechanical method using caulking or bayonet, an adhesive method using an adhesive, or a combination of both methods is used. The

  In the preceding example using the bayonet system for coupling with the internal magnetic circuit, as shown in FIG. 5, the frame 11 projects a plurality of elastic locking portions 11 a from the disk portion surrounding the magnetic circuit A. The elastic latching part 11a is inserted into the outer periphery of the bowl-shaped yoke 12 that surrounds the magnet 1, the top plate 2 and the bottom plate 3 of the magnetic circuit A, and is snapped in to couple the magnetic circuit A and the frame 11. . Then, an adhesive is applied to the periphery of the outer peripheral edge of the yoke 12 and the inner peripheral edge of the frame 11 to further strengthen the coupling. In this connection configuration, deforming the elastic locking portion protruding from the thin disk portion of the frame on the outer periphery of the yoke causes stress on the disk portion and causes damage to the disk portion. Further, the greater the number of the elastic locking portions, the greater the coupling force. However, since the fitting becomes difficult, there is a limit to the number, and the use of an adhesive compensates for this point. However, there is a problem that the heat generated by the magnetic circuit deteriorates the bonding force of the adhesive. This prior example is another example in which a magnetic circuit is coupled to the frame by inserting a caulking portion provided on the outer periphery of the yoke into a hole in the disc portion of the frame and caulking the tip against the disc portion. In this case as well, the thin disk portion of the frame is still susceptible to damage.

  Further, in a speaker using an external magnet type magnetic circuit, as a prior example of a configuration in which the yoke of the magnetic circuit is fixed to the frame by a caulking method, a center hole 17a of a ring-shaped yoke 17 as shown in FIG. The other end of the non-magnetic metal cylindrical mounting member 19 provided with a flange at one end is inserted, and at the portion where the bottom surface of the yoke 17 is placed, the center hole of the yoke is sandwiched by sandwiching the lightened frame 18 made of resin. The other end of the mounting member 19 protruding from 17a is caulked outward, and the yoke is fixed to the frame. This fixing by caulking provides a sufficient coupling force, eliminating the need to use an adhesive whose adhesive strength is reduced by the heat generated by the magnetic circuit, and making the cylindrical mounting member inserted through the center hole of the yoke non-magnetic. Since it was made of metal, the heat dissipation effect is enhanced along with the airflow generated in the hollow portion. However, the caulking operation requires a separate member, that is, an attachment member for that purpose, and there is a cost problem in that an additional tool and a process for performing press molding with a caulking tool from above and below in the Y direction in FIG. 6 are required. .

For details of the preceding examples, refer to Patent Documents 1 and 2 below.
JP 2002-10392 A Japanese Patent Laid-Open No. 8-251692

  In the prior example of FIG. 5, the coupling between the yoke 12 surrounding the outer periphery of the magnetic circuit A and the frame 11 is performed by a snap-in method using an elastic locking portion 11a protruding from the thin disk portion of the frame, or vice versa. However, the caulking method in which the caulking portion protruding from the magnetic circuit is caulked to the frame disc portion is used, but there is a problem that the thin disc portion of the frame is easily damaged in any of the methods. On the other hand, the speaker shown in the preceding example has the advantage of excellent heat dissipation in that the magnetic circuit having a cylindrical yoke member as the outer peripheral wall is exposed outside the disk portion of the frame. The structure in which the magnetic circuit protruding with specific gravity is coupled to the low specific gravity frame at a plurality of positions on the outer periphery of the yoke clearly includes a problem of strength.

  On the other hand, in the preceding example of FIG. 6, since the frame is surrounded by the bottom surface other than the hollow portion of the central yoke and the outer peripheral surface of the ring-shaped external magnet, the heat generated in the magnetic circuit is adopted. Is hardly released at the outer periphery thereof, and therefore, heat release must be dependent on the heat dissipation of the caulking and coupling hollow mounting member. In that sense, the speaker frame 18 in FIG. 6 protrudes in a ring shape downward from the bottom surface of the central yoke and the outer periphery of the magnet, and forms a space for securing a vibration area at the lower end of the voice coil. Even if it contributes to a certain amount of heat dissipation, a high heat dissipation effect cannot be expected from the resin frame. Rather, the further protruding portion from the magnetic circuit hinders the miniaturization of the speaker and becomes an important problem together with the cost problem due to the additional members, tools and processes described above.

  The present invention has been proposed to solve these problems, and uses a low specific gravity metal or resin and strengthens the connection with the magnetic circuit of the frame, which is lightened mainly by being thin, with a simple configuration. An object of the present invention is to provide a speaker frame having a coupling structure that is suitable for miniaturization of the entire speaker and has an excellent heat dissipation effect even when the speaker is miniaturized, and a speaker using the frame. .

  The speaker frame according to the first aspect of the present invention is formed thinly as a whole with a low specific gravity metal or resin, and has a central disc portion that is coupled to the magnetic circuit of the speaker at the central portion, and an outer peripheral edge of the central disc portion. The radiating part spreads radially from the speaker's diaphragm and the edge fixing part that is provided on the outer periphery of the radiating part and fixes the outer peripheral edge of the diaphragm's edge. The magnetic circuit housing cage includes an opening substantially equal to the outer dimension of the magnetic circuit, a plurality of leg portions protruding from the periphery of the opening, and a bottom portion connecting the tip ends of the leg portions.

  The speaker using the frame according to the invention of claim 2 is formed thin as a whole by a low specific gravity metal or resin, including a central disk portion, a radiating portion extending on the outer periphery thereof, and an edge fixing portion provided on the outer periphery of the radiating portion. Frame, a magnetic circuit coupled to the central disk portion of the frame and having an annular magnetic gap, a voice coil bobbin having a cylindrical voice coil carried at one end positioned within the magnetic gap, and a voice at the inner periphery A damper that holds the other end of the coil bobbin and is fixed to the disk part of the frame at the outer peripheral edge, and a vibration that is connected to the other end of the voice coil bobbin at the inner peripheral edge and fixed to the edge fixing part of the frame via the edge at the outer peripheral edge The frame is made of a plate, and the frame has an opening substantially equal to the outer dimension of the magnetic circuit at the center of the central disk portion, and a plurality of legs protruding from the periphery of the opening A magnetic circuit is housed in the cage of the frame with the voice coil positioned in the magnetic gap, and at least the legs and the bottom of the cage via an adhesive. It adheres to the inner surface of this.

  According to the present invention, the speaker frame and the speaker are formed to be thin as a whole including the disk part for coupling the magnetic circuit by molding a low specific gravity metal or resin, and at the periphery of the opening at the center of the disk part. A cage for accommodating a magnetic circuit, which is composed of a leg protruding from a plurality of positions and a bottom connecting the tip of the leg, is integrally formed with the disk part, so that at least the leg of the cage is simply connected to the magnetic circuit and the frame. Adhesive is applied to the inner surface of the bottom, and the magnetic circuit is accommodated in the cage and crimped to the inner surface, and there is no need for conventional caulking or bayonet system coupling or fixing. Also, if the heat radiation area around the magnetic circuit housed in the cage is increased, the legs and bottom of the cage form an open space for friends, which not only contributes to weight reduction of the frame but also contributes to heat generation of the magnetic circuit. In contrast, it provides a sufficient heat dissipation effect.

  Hereinafter, an embodiment showing the best mode for implementing a speaker frame and a speaker using the frame according to the present invention will be described in detail with reference to FIGS.

  1 is a side view of a speaker using a frame 20 according to the present invention, FIG. 2 is a bottom view thereof, FIG. 3 is a half sectional view of the cut end face thereof, and FIG. 4 is a perspective view of the bottom face side thereof. The frame 20 includes a disc portion 21 at the center bottom, a radiating portion 22 that spreads radially from the outer peripheral edge of the disc portion 21, and a ring-shaped edge fixing provided at the outer peripheral end of the radiating portion 22. Part 23. The whole is thin, that is, thin, for example, formed by injection molding, die casting, thixo molding, or the like using a low specific gravity metal such as magnesium having a specific gravity of 3.0 or less, aluminum, or an alloy thereof, or a resin. If aluminum, a drawing process can also be used.

  Preferably, the disc portion 21 is formed to have a thickness in the range of 0.5 mm to 1.5 mm. Therefore, as shown in FIG. 3, the strength is increased by raising the outer peripheral portion with a curved surface in a deep dish shape. Is advantageous. If it is 0.5 mm or less, sufficient strength cannot be obtained, and if it is 1.5 mm or more, it is not preferable in terms of weight reduction, so the range is 0.5 mm to 1.5 mm. In this case, the radiating portion 22 is formed by a composite beam composed of a straight portion and a curved portion, and has a sufficient strength and a sufficient strength. A ring-shaped edge fixing portion 23 is connected to the outer peripheral end of the composite beam, but ribs are provided at a plurality of locations in order to give strength while being thin.

  The frame 20 is provided with a means for accommodating and fixing the magnetic circuit 30 in the disc portion 21. This means is a magnetic circuit housing cage 24, a circular opening 25 pierced in the center of the disk portion 21, leg portions 26 extending outward from four locations on the bottom side of the edge of the opening 25, and these It is formed by a bottom portion 27 that connects the tips of the four leg portions 26. The opening 25 has a circular shape because the magnetic circuit 30 to be accommodated has a substantially cylindrical shape, and is not limited to a circular shape, but has a shape that matches the outer shape of the magnetic circuit. Further, in the illustrated case, the leg portion 26 and the bottom portion 27 are formed in a bridge shape that diametrically crosses the circular opening 25 as seen in the bottom view of FIG. 2, and have side edges parallel to each other. This is to form a release space as large as possible along the side edge, and a smaller space is formed between each pair of legs 26 on the longitudinal side of the bridge shape. As another example, it is also possible to provide a plurality of leg portions 26 at equal intervals and to make the bottom portion 27 circular, or to form four leg portions at equal intervals and to make the bottom portion square. A circular hole 28 is provided in the center of the bottom 27 to increase the opening degree of the cage 24. In any case, the peripheral surface of the opening 25 of the cage 24 and the inner surfaces of the leg portion 26 and the bottom portion 27 have a shape that allows the outer shape of the magnetic circuit 30 to be accommodated to be in close contact with the corresponding portion. desirable.

  In order to reduce the weight, the magnetic circuit 30 is mounted on the center-side yoke 31 having a substantially X-shaped cross section, a ring-shaped magnet 32 surrounding the outer periphery of the yoke body at a small interval, and the magnet 32. It is an outer magnet type that is formed by a ring-shaped pole plate 33 that forms a magnetic gap with the inner peripheral surface facing the outer peripheral surface of the upper end of the yoke 31 on the center side. A voice coil wound around the outer periphery of the lower end of the cylindrical voice coil bobbin 40 is positioned so as to vibrate within the magnetic gap of the magnetic circuit 30, and the upper outer periphery of the voice coil bobbin 40 is held by the inner peripheral edge of the ring-shaped damper 50. The outer peripheral edge of 50 is fixed to the outer peripheral edge of the disc portion 21 of the frame. A cone-shaped diaphragm 60 is coupled to the upper outer periphery of the voice coil bobbin 40 at the inner periphery, and the outer peripheral end of the diaphragm 60 is fixed to the edge fixing portion 23 on the outer periphery of the frame 22 via the edge 61. A dome-shaped dust cap 70 that covers the hole is joined to the center of the inner surface of the diaphragm to form a speaker. The dust cap 70 may be joined to the upper end of the voice coil bobbin 40.

  In assembling the speaker having the above configuration, first, an adhesive is applied to the inner surface of the cage 24 of the frame 20, that is, the peripheral surface of the opening 25, the inner surface of the leg portion 26, and the inner surface of the bottom portion 27. Is inserted into the cage 24 from the side of the yoke 31 to press-contact them. One end of the voice coil bobbin 40 is inserted into the magnetic gap of the magnetic circuit opened on the inner side of the frame disc portion 20, and thereafter, the damper 50, the diaphragm 60 and the dust cap 70 are respectively attached with adhesives in substantially the order described above. To complete the assembly.

  Thus, when the magnetic circuit 30 is housed and fixed in the cage 24 of the frame 20, any portion of the cage 24 formed integrally with the frame disk portion 21 is not deformed and stressed. The thin frame will not be easily damaged. Moreover, in the state fixed in the cage 24, since the leg part and bottom part of a cage are closely_contact | adhered with the magnetic circuit surrounding surface, the thermal radiation area of a magnetic circuit will increase. In addition, since the cage has a structure with a high degree of opening, the surface of the magnetic circuit is exposed to a large extent, and in combination, the structure is such that almost the entire surface of the magnetic circuit is exposed without provision of the cage. Rather, the heat dissipation effect is increased.

The side view of the speaker using the frame for speakers by the present invention. The bottom view of the speaker of FIG. FIG. 3 is a half sectional view of a cut end surface along the line III-III of the speaker of FIG. 2. The perspective view in the bottom face of the speaker of FIGS. The half sectional view of the speaker using the conventional inner magnet type magnetic circuit. Half sectional view of a speaker using a conventional outer magnet type magnetic circuit

Explanation of symbols

20 frame 21 disc part 22 radiation part 23 edge fixing part 24 magnetic circuit accommodation cage 25 opening 26 leg part 27 bottom part 28 hole 30 magnetic circuit 31 yoke 32 magnet 33 plate 40 voice coil bobbin 50 damper 60 diaphragm 70 dust cap

Claims (2)

  A central disk part that is thinly molded as a whole with a low-density metal or resin and that is connected to the magnetic circuit of the speaker at the center, and radiation that radiates from the outer periphery of the central disk part and faces the diaphragm of the speaker And an edge fixing portion that is provided on the outer peripheral edge of the radiating portion and fixes the outer peripheral edge of the edge of the diaphragm, and the central disc portion has an opening substantially equal to the outer dimension of the magnetic circuit at the center portion, A speaker frame, comprising: a magnetic circuit housing cage comprising a plurality of leg portions protruding from the periphery and a bottom portion connecting the tip ends of the leg portions.   A frame that is thinly formed of a low specific gravity metal or resin as a whole, including a central disk part, a radiating part that spreads on the outer periphery of the central disk part, and an edge fixing part provided on the outer periphery of the radiating part, and a central disk part of the frame A magnetic circuit having an annular magnetic gap, a voice coil bobbin for positioning a cylindrical voice coil carried at one end within the magnetic gap, and holding the other end of the voice coil bobbin at the inner peripheral edge and a disk of the frame at the outer peripheral end The damper is fixed to the other end of the voice coil bobbin at the inner peripheral edge and the diaphragm is fixed to the edge fixing portion of the frame through the edge at the outer peripheral edge. Magnetic circuit housing case comprising an opening substantially equal to the outer dimension of the magnetic circuit, a plurality of legs protruding from the periphery of the opening, and a bottom connecting the tips of the legs. The provided magnetic circuit is accommodated in the cage frame by positioning the voice coil in the magnetic gap, a speaker, characterized in that close contact with the inner surface of the leg portion and the bottom portion of at least the cage via an adhesive.

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