JP4563112B2 - Method for manufacturing edge for electroacoustic transducer and edge produced thereby - Google Patents

Description

  An edge is provided on the outer peripheral portion of the diaphragm for an electroacoustic transducer such as a speaker, and the outer peripheral portion of the diaphragm is supported by the frame through the edge so as to be vibrated.

Conventionally used as edge materials for free edge diaphragms include, for example, foam rubber, foam material, coated cloth, solid rubber, EPDM sheet, urethane elastomer, and the like. Reference examples related to them are shown below.
JP 2001-36987 A 6-26392 6-26393 JP 7-15793 A JP-A-8-65790 JP-A-8-14184

  When forming an edge by heat press molding or heat pressure molding such as vacuum molding, it is necessary to raise the mold temperature to near the melting point of the material, and take out large energy for heating and cooling the mold. There is a problem that there is something that is necessary and it takes time.

  In addition, the adjustment for the edge of cloth material and foam material is controlled by impregnation in the case of cloth material, and in the case of foam material, it is very difficult to adjust the minimum resonance frequency, such as by controlling the thickness and density of the foam material. It is difficult to.

  Further, since molding is performed by molding only a portion to be used after molding with a flat material larger than the part size, there is a problem that a lot of waste is generated, leading to an increase in the price of the part.

  The present invention has been proposed in view of the above, and the object thereof is that it does not require large energy such as hot press molding or vacuum forming, and can easily have any thickness and physical properties with a small number of man-hours. It is an object of the present invention to provide a method for manufacturing an edge of a diaphragm for an electroacoustic transducer with reduced waste and an edge produced thereby.

The invention of claim 1, the upper mold 2, resin 3 at least one of a pair of molds composed of a lower mold 1 is formed of a material the visible light is transmitted, and cured by pre-listen view light the sets and mold closing, before irradiating the pre-listen view ray from the outside of the mold which transmits hear viewing light, the upper mold 2, the resin corresponding to the clearance C formed between the lower mold 1 3 is characterized in that the thickness of an edge produced by molding 3 is changed .
The invention of claim 2 is the method of edge preparation according to claim 1 Symbol placement, woven, of nonwoven fabric, and wherein at least one of the materials was set in the mold, for molding by curing the resin 3 To do.
A third aspect of the present invention, in claim 1, wherein the edge preparation or 2, wherein the organic fibers, inorganic fibers, of the whiskers, and mixing at least one material in the resin 3 was set in the mold The resin 3 is cured and molded.
According to a fourth aspect of the present invention, in the edge manufacturing method according to any one of the first to third aspects, the clearance of the outer peripheral portion of the clearance C between the upper mold 2 and the lower mold 1 is increased, and the gasket 8 is provided on the outer peripheral portion of the edge. Are integrally formed.
According to a fifth aspect of the present invention, in the edge manufacturing method according to any one of the first to fourth aspects, at least one member of the diaphragm body 9 and the gasket 8 is set in the mold, and simultaneously with the molding of the resin 3. It is characterized by joining.
The invention of claim 6 is characterized in that the edge is produced by the method of claims 1 to 5 .

According to the present invention described in claim 1 as described above, vacuum forming, pressure forming, upper and lower molds as compared to hot pressing or the like by curing the resin 3 in a short time of several seconds to several tens of seconds by the visible light Since the edge is formed, it is not necessary to heat the mold, and the edge can be produced with low energy and in a short time.

Further, since no cure until irradiating the visible light, since no inhibiting fluidity can be manufactured easily even edges 6 of a desired thickness. Moreover, there is no need to input materials at high speed, no holding pressure at high pressure is required, and the equipment is inexpensive.

  Compared with vacuum forming, pressure forming, heating and press forming using upper and lower molds, etc., the required amount of material is such that a predetermined edge 6 is obtained if resin 3 having a volume substantially equal to the clearance C of the upper and lower molds 2 and 1 is introduced. Therefore, it is environmentally and economically excellent with less material to be discarded.

Further , by changing the clearance C between the upper and lower molds 2 and 1, an edge having a desired thickness can be formed, and the minimum resonance frequency can be controlled by the thickness of the edge.

According to the second aspect of the invention, the fibrous material 7 such as a woven fabric or a non-woven fabric can be simultaneously in-molded to have the same effect as the coating material.

According to the third aspect of the invention, the edge 6 having desired characteristics can be obtained.

According to invention of Claim 4 , the gasket 8 can be simultaneously shape | molded easily by thickening the clearance of an outer peripheral part.

According to the invention described in claim 5, it is possible to integrally form the diaphragm body 9 without using an adhesive.

According to the sixth aspect of the invention, it is possible to obtain the edge 6 which is easy to manufacture and inexpensive and has desired characteristics.

  Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1]
1 (1) to (7) show a first embodiment of the present invention.

In the first embodiment, first, as shown in FIGS. 1 (1) and (2), a clearance C is provided on the lower mold 1, and an edge forming clearance portion 1a corresponding to the edge shape is provided on the outer peripheral portion. with the lower mold 1 of transparent consisting of acrylic resin, formed on the surface, in the upper, as shown in step of FIG. 1 (2), is cured by the visible light, the resin 3 Tokoro the uncured liquid Add a constant amount.

As the resin 3, a urethane acrylate resin as a main component, benzoin ether, a resin viscosity at 20 ° C. formulated benzophenone amine as a photopolymerization initiator is cured by the visible rays of 20,000 [mPa · s] It is preferable to use it. The resin 3 is dropped in an amount substantially equal to the volume of the clearance C between the upper and lower molds 2 and 1.

  As shown in FIG. 1 (3), the lower die 1 and the upper die 2 constitute a molding die. The upper mold 2 is formed with an edge forming projection 1b corresponding to the edge forming clearance 1a of the lower mold 1.

  In this case, when the upper and lower molds 2 and 1 are closed, the clearance C between the upper and lower molds 2 and 1 can be adjusted by adjusting the lowered position of the upper mold 2. This lowered position adjustment can be easily performed by a known technique.

  Therefore, by adjusting the clearance C, an edge having a desired thickness can be obtained, whereby the stiffness of the edge can be easily controlled and a desired minimum resonance frequency can be obtained.

  Examples of the material that transmits ultraviolet light and / or visible light include soda glass, quartz glass, acrylic resin, polycarbonate resin, and the like. Table 1 shows the transmittance. Acrylic resin is used in this embodiment because it has good moldability and better transmittance than polycarbonate resin.

Next, as shown in step of FIG. 1 (4), and crimping the upper die 2 relative to the lower mold 1, the mold closing and, as shown in FIG. 1 (5), a material that transmits the visible light consisting of the visible light upward of the upper mold 2 is set to the light source 4 for emitting, to the resin 3 through the upper mold 2 and the visible light 5 by the light source 4 is irradiated a predetermined time to cure the resin 3 is molded. In addition, the light source 4 may be disposed and irradiated on the lower mold 1 side, and in this case, the curing time can be shortened.

Visible light was used as a light source, and irradiation was performed from above the upper mold 2 for 5 seconds .

  FIG. 1 (6) shows the edge material 6A taken out by opening the mold after the resin 3 is cured and molded.

Incidentally, the mold, the lower mold 1, but used as a upper mold 2 both the visible light 5 to form a material which transmits, either only one of the transmitting material is irradiated with light 5 from the mold-side You may do it.

  As shown in FIG. 1 (7), the edge material taken out can form the edge 6 by punching through the central portion 6 a.

[Embodiment 2]
FIG. 2 shows a second embodiment of the present invention.

In this embodiment, as shown in FIGS. 2 (1) and (2), after the resin 3 is dropped on the lower mold 1, as shown in FIG. 2 (3), among synthetic fibers, woven fabrics or non-woven fabrics in advance, set at least one fibrous material 7, FIG. 2 (4), as shown in (5), mold closing, and by Rika view ray to the light source 4 in a state where the resin 3 is in contact with the fibrous material 7 5 Is different from the above-described embodiment.

  As a position where the fibrous material 7 is set, it is provided between the lower mold 1 and the upper mold 2 on which the resin 3 is dropped as shown in the illustrated example.

The edge material 6A thus produced can have various physical properties that cannot be obtained with a resin alone. These are various possible combinations of the resin material that is cured by fibrous material 7 and the visible light 5, such as woven or nonwoven fabric, yet rubber by using the fibrous material 7, such as woven or nonwoven fabric, latex coating An edge material having an arbitrary physical property can be obtained without special pretreatment such as secondary treatment.

  Thereafter, as shown in FIG. 2 (7), the edge 6 having the fibrous material 7 can be formed by punching through the central portion 6a of the edge material 6A in which the fibrous material 7 is integrated.

[Embodiment 3]
FIG. 3 shows a third embodiment of the present invention.

  This embodiment is characterized in that the clearance on the outer peripheral side of the clearance formed between the upper and lower molds 2 and 1 is made large, and the gasket is integrally formed on the outer peripheral portion of the edge.

  Specifically, as shown in FIG. 3 (3), the outer peripheral portion of the lower die facing surface of the upper die 2 is made concave to form a recess 1c for forming a gasket, as shown in FIG. 3 (4). In addition, the resin enters when the mold is closed, and as shown in FIG. 3 (6), the gasket 8 is integrally formed on the outer peripheral portion, and as shown in FIG. 3 (7), the edge 6 with the gasket 8 is formed. It is something to get.

  Other configurations are the same as those of the first embodiment.

[Embodiment 4]
FIG. 4 shows a fourth embodiment of the present invention.

  In this embodiment, as shown in FIG. 4 (1), a concave portion 1d corresponding to the shape of the diaphragm body is formed in the central portion of the lower mold 1, and as shown in FIG. 2 is formed with a corresponding protrusion 1e, and as shown in FIG. 4 (6), the diaphragm body 9 and the edge 6 are integrally formed.

  That is, as shown in FIG. 4 (2), the diaphragm body 9 is set in the recess 1d, and the resin 3 is dropped onto the outer edge forming clearance 1a.

  Next, as shown in FIGS. 4 (3) and 4 (4), the upper mold 2 is closed, and light is irradiated as shown in FIG. 4 (5).

  If it does in this way, as shown in FIG. 4 (6), the molded object with which the diaphragm body 9 and the edge 6 were integrated can be obtained.

  In this embodiment, as shown in FIGS. 4 (3) to (5), the upper mold 2 is formed with a recess 1c for forming a gasket and the gasket 8 is simultaneously molded. Of course, it is also possible to incorporate a separate gasket using the one shown in FIG.

  In each of the above-described embodiments, if necessary, a resin material obtained by mixing at least one of organic fibers, inorganic fibers, and whiskers may be used as the resin 3 to obtain desired characteristics.

  Moreover, in the 1st-3rd Example of FIGS. 1-3, the shape of the upper surface of the lower mold | type 1 and the lower surface of the upper mold | type 2 facing this is the shape of the molded product shape | molded by dripping the resin 3 on a type | mold. The center part is punched out to form an edge, but the clearance is the clearance part of the edge part from the beginning, and as shown in FIG. 4 (2), resin 3 is dropped onto that part to mold the edge. May be. In this case, the punching process can be reduced.

It is 1st Example of this invention, (1)-(7) shows the manufacturing process of this invention. (1)-(7) show the manufacturing process of the second embodiment of the present invention. (1)-(7) show the manufacturing process of the third embodiment of the present invention. (1)-(6) show the manufacturing process of the fourth embodiment of the present invention.

DESCRIPTION OF SYMBOLS 1 Lower mold | type 1a Clearance part 1b Protrusion part 1c Gasket molding recessed part 1d Diaphragm body set recessed part 1e Protrusion part 2 Upper mold 3 Resin 4 Light source 5 Visible light 6 Edge 6A Edge material 6a Central part 7 Fibrous material 8 Gasket 9 Vibration Plate body C Clearance

Claims (6)

The upper mold (2), the lower mold (1) a set of the visible light to at least one of the mold made of forms of a material transmitting, and cured by pre-listen view ray resin (3) mold closing to set, before irradiating the pre-listen view ray from the outside of the mold which transmits hear viewing light, the upper die (2), clearance (C) formed between the lower mold (1) Correspondingly, an edge manufacturing method for a diaphragm for an electroacoustic transducer, wherein the thickness of an edge produced by molding the resin (3) is changed . In claim 1 Symbol mounting edge manufacturing method, a woven fabric, of nonwoven fabric, set at least one material into the mold, electroacoustic transducer, which comprises molding by curing the resin (3) A method for manufacturing an edge of a diaphragm. Claim 1, in the process of the edge preparation or 2, wherein the organic fibers, inorganic fibers, of the whiskers, and mixing at least one material to said resin (3) was set in the mold, the resin (3 ) Is cured and molded, and an edge manufacturing method for an electroacoustic transducer diaphragm. The edge manufacturing method according to any one of claims 1 to 3 , wherein a clearance in an outer peripheral portion of the clearance (C) between the upper die (2) and the lower die (1) is increased, and a gasket (8 ) Are integrally formed. A method for manufacturing an edge of an electroacoustic transducer diaphragm. In claims 1 to 4 how edges preparation according to any one, the diaphragm body (9), of the gasket (8), at least one member was set in the mold, molding and simultaneously bonding of the resin (3) A method for manufacturing an edge of a diaphragm for an electroacoustic transducer. Electroacoustic transducer diaphragm edges prepared in claims 1 to 5, wherein the method.

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