JPH0767197A - Cone type speaker and jig used for its manufacture - Google Patents

Abstract

PURPOSE:To provide the jig which can easily and securely perform position control over vibration system components in their adhering process and also manufacture the cone type speaker having stable frequency characteristics. CONSTITUTION:The jig consists of a lower jig 31 constituted by standing a support column 34 having a heating wire 33 incorporated in its center part, installing a cylindrical push-up cylinder 35 holding a specific gap with the support column 34, and forming a positioning wall 38 for the basket 12 of the speaker at the outer peripheral edge part and providing a heat fusing ring 37 including a high frequency heating coil 36 and a preliminary heating wire 36a for preheating at the upper part and an upper jig 32 constituted by projecting a preheating part which includes a heating wire 39, has its reverse end surface shaped in conformity with the shape from a cone to a dust cap, and also has a recessed part 41 formed in the center, on the reverse surface of the center part, forming an engagement skirt 24 at the outer peripheral end, and installing a heat fusing ring 43 which includes a high frequency heating coil 44 and a heating wire 44a for preheating inside the skirt 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodynamic cone type loudspeaker and a jig used for manufacturing the loudspeaker.

[0002]

2. Description of the Prior Art Electrodynamic cone speakers are generally
Vibration plate (cone), edge, voice
Coils, dampers, dust caps, magnets that compose a magnetic circuit, center poles, yokes, plates, and frames that compose the main body, gaskets, input terminals, tinsel wires, etc. ing. Normally, in assembling it, first the frame is fixed to the magnetic circuit, then the damper and the cone are adhered to the voice coil, and then the dust cap is adhered to the cone.

[0003]

According to the above-described conventional assembling method, the frame and the voice circuit are irregularly dimensioned and are in a positionally unstable state. Since the vibration system such as the coil and damper will be fixed by adhesion, it is very difficult to control the position of each part, and how strict is the homogenization of the weight, material, shape, etc. of each vibrating part that directly affects the frequency characteristics. Even if it is managed according to the above, there is a problem in that the performance is not stable because variations occur in the assembly. In particular, it is difficult to constantly control the attachment state and position of the dust cap that governs the high-frequency characteristics, and it is not possible to strictly control the high-frequency characteristics that the dust cap handles in the mass production process. For that reason, many manufacturers manage high frequency characteristics by designing loudspeaker devices by using expensive tweeters.

In addition, foreign matter may enter the magnetic circuit,
Even if a defective product caused by a work error such as a lapping was found in the inspection after the completion of the assembly, it could not be repaired. Further, in the case of the above-mentioned conventional assembling method, since there are many bonding points, not only is it troublesome to work, but also a large amount of adhesive is used, the weight of the vibration system becomes heavy, and the frequency characteristics are adversely affected. There was also.

The present invention has been made in order to solve the above problems in the conventional method, and it is possible to easily and surely control the positions of the vibration system parts in the bonding process. Stable frequency characteristics are obtained, work efficiency is good because there are few bonding points, dust and foreign matter can be easily checked even after moving parts are assembled in the basket (frame), and vibration system replacement It is an object of the present invention to provide an electrodynamic cone-type speaker which can be easily repaired and a jig used for manufacturing the same.

[0006]

According to the present invention, as means for solving the above-mentioned problems, the dust cap is lighter and thinner than the cone, and both are integrally molded, and the dust cap is installed on the outer peripheral edge of the cone. (EN) A cone-type speaker characterized in that an outer peripheral end of an edge and an outer peripheral end of a damper are simultaneously heat-welded to a basket.

As a means for solving the above-mentioned problems, the present invention further comprises a support column having a heating wire built therein at the center thereof, and a cylindrical push-up cylinder holding a predetermined gap with respect to the support column is vertically moved. It is installed as possible, and a positioning wall for positioning the basket of the speaker is formed at the outer peripheral end,
A lower jig that has a high-frequency heating coil and a heat-welding ring that contains a heating wire for preheating in the upper part, and a heating wire that is built in at the back of the center part, and the lower end surface has a shape from the cone to the dust cap. In addition to having a corresponding shape, a preheating portion formed with a recessed portion for allowing the dust cap to escape is formed at the center, and a positioning fitting skirt is formed at the outer peripheral end, and a high frequency wave is provided inside the positioning fitting skirt. (EN) A jig for producing a speaker, which comprises an upper jig having a heating coil and a heat-welding ring containing a heating wire for preheating installed therein.

[0008]

[Operation] Since the cone and dust cap are integrally molded, a lightweight dust cap can always be placed in a fixed position, and high frequency characteristics can be managed. Since there are few parts to be bonded during assembly, production efficiency is high and cost reduction can be realized. In the jig according to the present invention, the voice coil is fitted to the support pillar of the lower jig in the preheated state, the damper is placed on the push-up cylinder and the heat-welding ring, and the basket is set on the positioning wall for adhesion. After supplying the adhesive to the part, the integrally molded cone and the dust cap are placed.
Then, after placing the upper jig on it, the edge and the end of the damper are heat-welded to the basket by the action of the high-frequency heating coil.

As described above, since the movable parts are incorporated into the basket having a high dimensional accuracy by using the upper and lower jigs, the dimensional control is properly performed, and the heat welding is performed at the same time as the positioning and the preheating is performed. The adhesive is pushed by the push-up cylinder and spreads uniformly, so that the adhesive is surely adhered and the curing is accelerated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a vertical cross section of a speaker and a jig for assembling the same according to the present invention. In the figure, 1 is a cone, 2 is an edge (surround) bonded to the outer peripheral edge of the cone, Three
Indicates a dust cap arranged at the center of the cone 1.
The cone 1 and the dust cap 3 are integrally molded with one mold. This stabilizes the position of the dust cap 3 with respect to the cone 1 and eliminates the step of bonding the cone 1 and the dust cap 3 to each other, which is advantageous not only in cost but also in the vibrating portion. It is possible to reduce the weight and improve the high frequency characteristics.

In order to mechanically separate the dust cap 3 from the heavy cone 1 and mechanically directly attach it to the bobbin 7 of the voice coil 6, the cone 1 is improved.
On the other hand, the dust cap 3 is made thin, and the separation groove 4 having high compliance is formed in an annular shape at the boundary between the both (see FIG. 3). The separation groove 4 is also used for bonding a voice coil 6 which will be described later. That is, the upper end of the bobbin 7 of the voice coil 6 fits into the separation groove 4.
The cone 1 covering the low-range and mid-range characteristics has a large shape and is a sturdy one that is not deformed by the air resistance received by a large vibration, and thus is thicker and heavier than the dust cap 3. .

Reference numeral 5 is a damper, and the bonding portion between the bobbin 7 of the voice coil 6 and the cone 1 and the damper 5 is
It is necessary to have good adhesion durability against severe mechanical vibration and high heat received from the voice coil 6. If a hard adhesive is used in consideration of high frequency characteristics, the adhesion state with the soft material such as the cone 1 and the damper 5 is deteriorated, and an accident such as peeling or damage due to strong vibration is likely to occur.
However, in the present invention, the high-frequency characteristics are improved as described above, and it is not necessary to consider the high-frequency characteristics that the dust cap 3 is responsible for. Therefore, the adhesive effect of this portion is relatively good. A soft material can be used, and thus the adhesion durability of that portion can be improved.

FIG. 4 shows an example of the structure of the voice coil 6. A winding 8 is wound around the lower part of a cylindrical bobbin 7, and a lead wire 8a from the winding 8 is stopped on the upper part thereof. With
A tape 9 is wound to improve the adhesiveness between the damper 5 and the voice coil 6. An appropriate number of recesses 10 are formed on the upper end of the bobbin 7. The concave portion 10 is for guiding the adhesive supplied to the bonding portion between the cone 1 and the damper 5 to the dust cap 3 side through the concave portion 10 as described later. 11 is the Kinshi Line.

Reference numeral 12 is a cylindrical basket (frame) in which the above-mentioned cone 1, edge 2, dust cap 3, damper 5, voice coil 6 and the like are incorporated, and is usually molded by plastic. A pedestal 13 for fixing the end portion of the edge 2 is formed on the upper surface of the basket 12, and a step portion 14 for fixing the end portion of the damper 5 is provided around the middle of the inner surface. At the same time, support grooves 15 for installing the magnetic circuit are formed in the lower portion thereof at appropriate intervals.

The support groove 15 is formed from the lower end surface of the basket 12, and the upper portion thereof is laterally extended (see FIG. 5).
), There, the front plate 16 on the upper surface of the magnetic circuit.
The convex portions 17 formed at appropriate intervals are fitted on the peripheral surface.
That is, the magnetic circuit has a yoke 1 having a pole 18 at the center.
The donut-shaped magnet 20 is installed on the magnet 9, and the front plate 16 is placed on the magnet 20 (see FIG. 2).
It is inserted into the basket 12 from below so that the front plate 16 comes into contact with the upper surface of the support groove 15 and is rotated. Then, the convex portion 17 makes the support groove 15
Of the magnetic circuit to the basket 12 by fitting in the lateral extension of the.

In addition, on the lower part of the outer surface of the basket 12,
A screw thread 23 for screwing the speed nut ring 22 for fixing the speaker to the box plate 21 is formed (FIG. 8).
In addition, an O-ring groove 25 into which an O-ring 24 for preventing vibration and absorbing vibration is formed at the upper portion of the outer surface while preventing air leakage between the box plate 21 and the box plate 21. A large number of air holes 26 are formed through the entire surface of the basket 12 so that the inside and the outside of the basket 12 communicate with each other. The tinsel wire 11 is pushed out of the basket 12 through the air hole 26, but preferably, a portion for preventing vibration of the tinsel wire 11 is provided at that portion.

That is, the tinsel wire 11 is oscillated irregularly with the vibration of the winding 8 of the voice coil 6, but since the caulking or soldering processing part joined to the terminal is weak against the vibration, There are not a few accidents where the part is damaged. Therefore, in the present invention, a tube 28 made of rubber or the like that functions as a vibration damper is provided at the joint between the tinsel wire 11 and the lead wire 27.
Is fitted. And an air hole 26 for drawing out the tinsel wire 11
Depress the center of the hole to form a side hole 29, and place the tube 2 there.
8 is inserted (see FIG. 7). Thus, the vibrations received by the tinsel wire 11 are absorbed by the tube 28 and are not directly transmitted to the lead wire connecting portion, so that there is almost no accidental damage to the terminal portion. Further, a vertical groove 30 for accommodating the leader line 27 is formed on the outer side surface of the basket 12.

Next, a jig used for manufacturing the speaker having the above structure will be described. As shown in FIG. 1, the jig comprises a lower jig 31 for placing and positioning the basket 12 and an upper jig 32 set on the basket 12. At the center of the lower jig 31, a support column 34 incorporating a heating wire 33 for preheating is provided upright. The diameter of the support column 34 is slightly smaller than the inner diameter of the bobbin 7,
The bobbin 7 can be fitted from above.

Then, a cylindrical push-up cylinder 35 is installed so as to surround the support column 34 so as to be vertically movable. A gap into which the voice coil 6 can be inserted is held between the support column 34 and the push-up cylinder 35. On the outer periphery of the lower jig 31,
A circular heat-welding ring 37 having a high-frequency heating coil 36 and a heating wire 36a for preheating built therein is installed at an upper portion, and a positioning wall 38 for positioning the basket 12 by fitting the basket 12 is formed at a lower end portion thereof. To be done. Further, the heat-welding ring 37 is appropriately provided with a ventilation hole 37a for cooling.

At the center of the lower surface of the upper jig 32, there is provided a preheating section 40 containing a heating wire 39 for preheating. The lower end of the preheating portion 40 has a shape corresponding to the shape from the cone 1 to the dust cap 3 (see FIG. 9), and a concave portion 41 for letting the dust cap 3 escape is formed on the lower surface thereof. A positioning fitting skirt 42 is formed on the outer peripheral end of the upper jig 32, and the pedestal 1 of the basket 12 is provided inside thereof.
Hold the edge of the edge 2 between it and the edge 2
A heat-welding ring 43 that is welded to 3 is installed. The heat welding ring 43 includes a high frequency heating coil 44 and a heating wire 4 for preheating.
4a is built in. The upper jig 32 and the lower jig 31
An air introduction hole 46 for cooling is formed in each of the above, and a ventilation hole 46a for cooling the inside of the fitting skirt 42 is further formed in the upper jig 32.

In manufacturing a loudspeaker using the above jig, the voice coil 6 is first fitted to the support column 34 of the lower jig 31. When the damper 5 is placed, the outer peripheral end portion of the damper 5 rides on the heat-welding ring 37, and the innermost corrugated bottom portion rides on the push-up cylinder 35. At that time, the push-up cylinder 35 is in the lowered position. At that time,
The center hole of the damper 5 is located on the surface of the tape 9 of the bobbin 7, and the damper 5 is located slightly lower than the normal mounting position.

Next, the basket 12 is fixed to the positioning wall 38.
, And dispose it at a predetermined position, and attach the tinsel wire 11 and the lead wire 24 to the lateral hole 26 via the tube 25. The basket 12 is held at a predetermined position by the positioning wall 38, and the lower surface of the stepped portion 14 presses the outer peripheral end of the damper 5 between itself and the upper surface of the heat welding ring 37. In addition, the lower jig 31 and the upper jig 32 have heating wires 36a and 44a, respectively.
Is preheated to near the melting point of the material of the basket 12.

In the above state, an appropriate amount of adhesive 45 is supplied to the contact portion between the voice coil 6 and the damper 5, and then the cone 1 integrally formed with the dust cap 3 is placed. Since the adhesive (two-liquid mixed epoxy) 45 is preheated by the heating wire 33, the adhesive 45 becomes soft and is uniformly applied to the bonded portion and hardens quickly. Then, the upper jig 32 is placed,
By heating with the heating wire 39 while pressurizing the bonding part of the cone 1 with the preheating part 40, the curing of the adhesive is accelerated. At that time, the push-up cylinder 35 rises, and the inner end portion of the damper 5 slides up along the voice coil 6 and is positioned at the normal position. As a result, the adhesive 45 is pushed out a little, and a part of the adhesive 45 flows through the recessed portion 10 of the voice coil 6 to the back surface of the dust cap 3, and the cone 1, the dust cap 3, the damper 5 and the voice coil 6 are removed. Since the adhesive area between the four members increases, the adhesive force between them increases.

Further, since the push-up cylinder 35 rises to a predetermined position, the gap between the push-up cylinder 35 and the welding portion 40, in other words, the assembly of the cone 1, the dust cap 3, the tamper 5 and the voice coil 6. Since the gap is always constant,
It is possible to assemble these parts with strict size control.

When the upper jig 32 is placed, the edge 2
The outer ends of the pedestal 1 and the heat welding ring 43 of the upper jig 32 are
It is pressed between 3 and. Then, the cuffed portion of the edge 2 and the cuffed portion of the damper 5 are the high frequency heating coil 4
By applying an electric current to Nos. 4 and 36, they are instantly heat-welded to the pedestal 13 of the basket 12 and the stepped portion 14, respectively. In this way, no adhesive is used to fix these parts, and the temperature of the heating wires 33, 36a, 39, 44a is kept low, and the temperature change is accelerated by the action of the high-frequency heating coils 36, 44. Therefore, the production efficiency is improved.

After the thermal welding on the pedestal 13 and the stepped portion 14 is completed, cooling air is introduced into the jig through the air introduction hole 46 and allowed to flow through the ventilation hole 37a, so that the thermal welding ring having a small heat capacity is obtained. The temperatures of 37 and 43 can be lowered within a short period of time, so that the welded portion can be quickly stabilized.

[0027]

The present invention is as described above, and is very useful with the following numerous effects. (1) Coils directly related to frequency characteristics on the basket
The voice, voice coil, damper, etc. can be accurately installed in a fixed position, and an integrated module with stable performance can be obtained. Moreover, in the production of this integrated module, there are few bonding treatment points and the assembling work efficiency is good.

(2) Since the integrated module can be mass-produced separately from the magnetic circuit whose shape is irregular and whose dimension control is difficult, a product with stable characteristics can be obtained, and the integrated module can be obtained. Since a visual inspection can be performed before the module is incorporated into the magnetic circuit, foreign matter and dust that have entered due to a work error can be removed in advance, so that accidents due to the entry of foreign matter can be prevented. Further, even if a defect occurs in the vibrating part that is most likely to cause a failure, only the integrated module can be replaced, which is economical.

(3) Since the magnetic circuit can be produced independently from the integrated module, it can be assembled easily and quickly by using an automatic assembling machine, and the production efficiency is improved. Further, since the magnetic circuit is small and has a constant size, a small magnetizer can be used when magnetizing and the magnetizers can be placed close to each other, so that the power consumption can be kept low and the production cost can be reduced. Can be realized. (4) Since the cone and dust cap are integrated,
No adhesive is required to join the two, the weight is kept light, and the dust cap responsible for high frequency characteristics can always be placed in a fixed position, making it an expensive twister.
It is possible to manage the high frequency characteristics without using a switch.

(5) Mechanical vibration of the voice coil is directly and efficiently transmitted to the dust cap, which is lighter than the cone. Therefore, the air resistance is small, the compliance of the adhesive is not affected, and the high frequency characteristic is high. Be improved. (6) As the adhesive, a soft adhesive having a high adhesive effect can be used, and moreover, since the adhesive area can be sufficiently secured, the adhesive durability can be greatly improved.

(7) Since the connecting portion between the lead wire of the voice coil and the tinsel wire is hardened in the adhesive, accidents due to vibration at that portion are reduced. In addition, the connecting portion between the tinsel wire and the basket outer lead wire is connected to the tug fixed to the basket.
Since it is housed in the tube, damage to that part due to vibration can be avoided as much as possible. (8) According to the jig of the present invention, since each component can be adhered and heat-welded while being held in a stable state, strict position control is possible, and a speaker with excellent performance is provided. It can be efficiently manufactured at low cost.

(9) In the case of the conventional production method, since the parts are assembled into the basket through many steps, the equipment becomes large and a floor area of ²⁰⁰ to 600 m ² is required. However, in the case of the present invention, since each step (mainly three steps) can be arranged in a turret type on the table, the equipment becomes small and the installation floor area is 10 to 2.
About 0 m ² is sufficient, and the production efficiency will be dramatically improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a usage state of a jig according to the present invention.

FIG. 2 is a partial sectional front view of a speaker according to the present invention.

FIG. 3 is a cross-sectional view showing a connection relationship between a cone and a dust cap.

FIG. 4 is a perspective view showing a voice coil.

FIG. 5 is a diagram showing a method of attaching the magnetic circuit to the basket.

FIG. 6 is a diagram showing a method for connecting a tinsel wire and a lead wire.

FIG. 7 is a view showing a method of installing a tube for connecting a tinsel wire and a lead wire.

FIG. 8 is a view showing a method of attaching the speaker to the box plate.

FIG. 9 is a diagram showing a method of adhering a vibration system component.

[Explanation of symbols]

 1 cone 2 edge 3 dust cap 5 damper 6 voice coil 11 tinsel wire 12 basket 27 lead wire 28 tube 31 lower jig 32 upper jig 33 heating wire 34 support pillar 35 push up cylinder 36 high frequency heating coil 36a Heating wire 37 Heat welding ring 37a Vent 38 Positioning wall 39 Heating wire 40 Preheating part 41 Recessed portion 42 Positioning fitting skirt 43 Heat welding ring 44 High frequency heating coil 44a Heating wire 45 Adhesive 46 Air introduction hole

Claims (3)

[Claims] 1. A dust cap that is lighter and thinner than a cone, is formed integrally with both, and the outer peripheral edge of the edge and the outer peripheral edge of the damper installed on the outer peripheral edge of the cone are simultaneously placed on the basket. A cone type speaker characterized by heat welding. 2. The connecting portion between the lead wire of the voice coil and the tinsel wire is located inside the adhesive supply portion, and the connecting portion between the tinsel wire and the outside basket lead wire is inside an elastic tube provided on the side surface of the basket. The cone type loudspeaker according to claim 1, which is housed in. 3. A support pillar having a heating wire built therein is provided upright in a central portion of the support pillar, and a cylindrical push-up cylinder having a predetermined gap with respect to the support pillar is installed so as to be movable up and down. In addition to forming a positioning wall for positioning the basket of the car, a lower jig having a heat welding ring having a high-frequency heating coil and a heating wire for preheating installed in the upper part, and a heating wire on the back surface of the center part. The bottom end surface has a shape corresponding to the shape from the cone to the dust cap, and a preheating portion with a recessed portion that allows the dust cap to escape is provided in the center, and a positioning fitting skirt A jig for speaker production, which comprises an upper jig having a high-frequency heating coil and a heat-welding ring containing a heating wire for preheating installed inside the positioning fitting skirt.