JP4012213B2 - Assembling method of speaker unit diffuser - Google Patents

Description

The present invention horn driver unit, indoor and outdoor loudspeaker unit, method for assembling Difuyu The various speaker units and other compression schemes employ speaker units.

  A unit commonly called a horn driver unit is a speaker unit currently used in the acoustic industry worldwide. One of the parts used in this speaker unit is a diffuser.

  In the speaker unit, the diffuser is provided as a diffusion device that diffuses and radiates sound in the left-right direction and the upward direction so as to widen the total directivity in combination with a diaphragm as a sound source.

As shown in FIG. 10, the diffuser 1 is composed of a plurality of conical or frustoconical members 2 _1, 2 _2, 2 _3, 2 ₄ in a multiple concentric manner, and the assembly surface of the combined members is brought close to the diaphragm. Thus, a curved surface without unevenness is provided as a slit opening through which sound from the diaphragm enters, and the space between the members 2 _1, 2 _2, 2 _3, 2 ₄ is a horn-like one.

Such diffusers, since the function on very high sound pressure is always applied, the members 2 _{1, 2} 2, _{2 3,} 2 ₄ must be assembled to the structure with a certain degree of fitting strength.

In order to form a diffuser 1 having such a fitting strength by combining a plurality of members 2 _1, 2 _2, 2 _3, 2 ₄ in multiple concentric shapes, conventionally, as shown in FIG. A method is used in which a certain assembly foot 3 is formed as members 2 _1, 2 _2, 2 ₃ , and is fitted into a groove 4 that is a recess of an adjacent member. This fitting is combined by the following method.

1) A manufacturing method in which the members 2 _1, 2 _2, 2 _3, 2 ₄ which are metal molded products having the assembly foot 3 and the groove 4 are assembled one by one by the press-fitting method.
2) A manufacturing method in which members 2 _1, 2 _2, 2 _3, 2 _{4 ,} which are metal molded products with assembly feet 3 and grooves 4, are combined and integrated by welding or welding.
3) A manufacturing method in which members 2 _1, 2 _2, 2 _3, 2 ₄ which are resin molded products with assembly feet 3 and grooves ₄ are combined and bonded with an adhesive.

  There is no patent document regarding such a diffuser and its manufacturing method.

  As described above, since a very high sound pressure is always applied to the diffuser portion of the speaker unit, a sufficient coupling strength cannot be obtained with the conventional fitting structure of the assembly foot 3 and the groove 4, and the natural vibration is generated. Diffuser noise is likely to occur without being suppressed.

In addition, a molded product is used for each member 2 _1, 2 _2, 2 _3, 2 ₄ . Since the molded product is assembled as shown in FIG. 10, the fitting accuracy is poor. In order to conduct a trial listening test in a finished product state, the molds are raised one by one, so it is very expensive.

The object of the present invention is to eliminate the inconvenience of the conventional example, and to produce a part with reduced cost by cutting only without raising the mold, and can be manufactured at low cost, and the conventional compression structure is impaired in fitting strength. can be improved without the conventional more fitting accuracy can be realized, there is provided a method of assembling Difuyu the speaker unit spread the freedom of material selection.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a method of manufacturing a diffuser for a speaker unit in which a plurality of members are concentrically combined with each other. Prepare each member before cutting the outer surface, the bolt insertion to insert the jig fixing screw whose tip can be inserted into each member is formed, and the center member to the assembly jig that can screw each member Are attached sequentially, and each member is arranged in multiples, and each member is fixed with a joint bar that is inserted into the insertion hole provided in each member from the outside of the assembly jig, and the screw is released to fix the assembly jig. The gist is to cut the member assembly surface, which is a sound entry surface, into a curved surface.

  According to the first aspect of the present invention, since the through bar is fixed through the joint bar, the manufacturing method is simpler than the conventional fitting between the assembly foot and the groove, the unprecedented assembly accuracy can be realized, and the assembly structure is achieved. Toughness can be realized, and it is possible to make parts with low cost because it can be created by cutting only without cutting the mold.

  In addition, since the member assembly surface that is the sound entry surface is a curved surface by cutting, it is possible to realize fitting accuracy that is higher than that of the conventional art.

  It is possible to select materials other than the conventional standard material, zinc / aluminum diecast.

  Thus, the present invention is easy to manufacture, and can produce a diffuser with low cost and high accuracy.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway side view showing an example of a diffuser 1 of a speaker unit produced according to the present invention, and FIG. 2 is a rear view of the same, which is used for a unit called a horn driver unit in the speaker unit. It is an example as a part which is done.

  3 and 4 show an example of the horn driver unit. The member assembly surface 7 as the sound input surface of the diffuser 1 is brought close to the diaphragm 13 as the sound source, and the horn throat 14 is located on the front side. To do. In the figure, 15 is a magnet, 16 is a pot yoke, and 17 is a pole piece.

The diffuser 1 of the present invention is also composed of a plurality of concentric members 5 _1, 5 _2, 5 _3, 5 _4, 5 ₅ .

Each member 5 _1, 5 _2, 5 _3, 5 _4, 5 ₅ is inserted and fixed by a joint bar 6 inserted from the side in a concentric state.

Of the members 5 _1, 5 _2, 5 _3, 5 _4, 5 ₅ , the member 5 ₁ is a conical member located at the center, and 5 _2, 5 _3, 5 ₄ are sequentially arranged outside the donut-shaped cone body trapezoidal member, member 5 ₅ is located outermost, it is a member with a flange 8.

  In the illustrated example, the joint bar 6 is a cylindrical body and has a bolt-shaped head. However, the shape is not limited to this, and a flat bar, a triangular bar, a polygonal bar, or a circular hollow bar may be used. It is possible to substitute. Furthermore, the joint bar 6 may have a screw structure with the entire length or only the tip. Although the illustration shows the case where the joint bar 6 is used for fixing from three directions, the present invention is not limited to this, and it is possible to maintain a strong bond strength by jointing and assembling from a plurality of directions.

  In the figure, reference numeral 7 denotes a member assembly surface which is a sound input surface, and has a slit opening 18 for receiving sound from the diaphragm 13 as shown in FIG. 2, which is formed by a curved surface as a cutting formation surface.

Next, a method for assembling the diffuser for the speaker unit of the present invention will be described. In order to assemble the diffuser 1, as shown in FIG. 5, the members 5 _1, 5 _2, 5 _3, 5 _4, 5 ₅ before the member-bonding outer surface 7 is formed by cutting are prepared. The material of each member 5 _1, 5 _2, 5 _3, 5 _4, 5 ₅ is not limited to a conventional metal casting, and materials other than zinc / aluminum die gas including synthetic resin can be selected. All solid materials that can be processed can be applied.

Although the members _{5 1,} 5 _2, 5 _{3, 5} 4, _{5 5} insertion hole 9 of the joint bar 6 in is formed, the insertion hole 9 of the member _{5 1} is a hole that does not penetrate, the other The insertion holes 9 of the members 5 _2, 5 _3, 5 _4, 5 ₅ are through holes.

An assembly jig 10 for assembling these members 5 _2, 5 _3, 5 _4, 5 ₅ is prepared. The assembly jig 10 is formed with a bolt insertion 11 for inserting a jig fixing screw 12 (see FIG. 6) whose tip can be inserted into the members 5 _2, 5 _3, 5 _4, 5 ₅ .

As shown in FIG. 6, the members ₅ 1 the assembly jig _10, 5 _2, 5 _{3, 5} 4, ₅ sets ₅ from member _{5 1} while fixing the respective jig fixing screw 12 in order, each member 5 _{At the place where 1,} 5 _2, 5 _3, 5 _4, 5 ₅ are combined, the joint bar 6 is inserted and fixed so that there is no backlash.

  Next, as shown in FIG. 7, the jig fixing screw 12 is removed, and the diffuser 1 assembled from the assembly jig 10 is taken out.

  At this stage, the member assembly surface 7 is uneven, but the curved surface is cut with an NC lathe or the like to complete.

  The shape and the like described above are examples, and the present invention is not limited to this, and an ellipse, a square, a deformation stroke type, and a diaphragm front installation type diffuser can also be applied. Further, the diffuser of the present invention can be applied not only to the diffuser of the horn driver unit described above but also to a diffuser of various speaker units such as an indoor / outdoor loudspeaker unit and other compression type speaker units.

It is a partially cutaway side view showing an example of a diffuser produced by the present invention. It is a front view which shows an example of the diffuser produced by this invention. It is a vertical side view of the driver unit incorporating the diffuser of the present invention. It is a rear view of the driver unit incorporating the diffuser of the present invention. It is explanatory drawing which shows one Embodiment of the assembly method of the diffuser of the speaker unit of this invention. It is the side view partly notched which shows the installation state to the assembly jig with the assembly method of the diffuser of the speaker unit of this invention. FIG. 4 is a partially cutaway side view of the speaker unit diffuser assembly method of the present invention in a state of being removed from the assembly jig. FIG. 5 is a partially cutaway side view of the speaker unit diffuser assembly method of the present invention after cutting. It is a partially cutaway side view showing a conventional assembly method. It is a partially cutaway side view showing an example of a conventional diffuser.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diffuser 2 _1, 2 _2, 2 _3, 2 ₄ Member 3 Assembly leg 4 Groove 5 _1, 5 _2, 5 _3, 5 _4, 5 ₅ Member 6 Joint bar 7 Member assembly surface 8 Flange 9 Insertion hole 10 Assembly jig 11 Bolt insertion 12 Jig fixing screw 13 Diaphragm 14 Horn throat 15 Magnet 16 Pot yoke 17 Pole piece 18 Slit opening

Claims (1)

  In a method of manufacturing a diffuser for a speaker unit in which a plurality of members are concentrically combined, a joint bar insertion hole is formed, each member is prepared before cutting the member outer surface, and the tip is inserted into each member. Bolts are inserted to insert possible jig fixing screws, and each member is mounted in order from the central member to an assembly jig that can fix each member, and the members are assembled in multiple layers. It is fixed with a joint bar inserted from the outside of the jig into the insertion hole provided in each member, the screw fixing is released, the assembly jig is removed, and the member assembly surface that is the sound entry surface is cut into a curved surface Assembling method of the diffuser of the speaker unit.

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