JP3116340B2 - Method of manufacturing acoustic device and acoustic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic device and a method of manufacturing the same, and more particularly to a grill cover for an acoustic section containing a speaker or the like.

[0002]

2. Description of the Related Art In an acoustic device such as an electronic musical instrument, a grill is formed on a sound emitting surface of an acoustic portion accommodating a speaker and the like.
A grill cover made of a porous material such as a mesh is provided to cover the grill. Conventional grill covers have used an integrally formed structure of punching metal or an integrally formed structure of plastic. The punched metal integrally formed structure is formed by punching a thin metal plate to form a punched metal, squeezing it according to the shape of the sound emitting surface mounting part of the acoustic part, correcting warpage, and curved surface shape corresponding to the mounting surface It is formed in. The integrated plastic structure is formed by injection molding or the like using a resin molding die.

[0003]

However, in a conventional grill cover having a punching metal integrated structure,
On the other hand, strength and texture can be obtained, but when the shape becomes complicated or large, the shape of the mold for forming the curved surface becomes complicated or large, the cost increases, and the processing work becomes troublesome.

Further, in the case of a grill cover having a plastic integral structure, an arbitrary curved surface shape can be formed relatively easily, but the strength may be insufficient in some cases, and the quality of appearance is inferior. come. In the case of a plastic structure, when the mesh is made fine, the mold becomes complicated and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and is intended to manufacture an acoustic device having sufficient strength and texture, and capable of easily obtaining an arbitrary curved surface shape and reducing costs. The purpose is to provide a method.

In order to achieve the above object, according to the first aspect of the present invention, a keyboard is provided on an upper surface side of an acoustic section containing a speaker.
Along the left and right along with a grille on this
The grill cover is attached to cover the grill
A method for manufacturing an acoustic device for an electronic keyboard instrument , having a predetermined width, at least a total length of 500 mm or more , and
When supported horizontally at the edge of the
Forming a metal cover plate by performing a porosity process on a thin metal plate having a thickness that is curved down ; and forming a frame made of a resin material for protecting an edge of a peripheral end surface of the metal cover plate with an acoustic device. integrally formed with the mounting elastic piece to the main body, and forming the grill cover the frame and attached to the peripheral edge face of the metal cover plate, the grill cover, the elastic pieces and / or metal cover the elasticity of the plate and / or frame, an electronic keyboard and a step of elastically anchoring to the acoustic portion of the acoustic apparatus body
Provided is a method for manufacturing an acoustic device for a musical instrument .

In the invention according to claim 2, the metal cover plate is set in a mold, and a resin material is outsert-molded on the metal cover plate to form the frame and attach it to the metal cover plate. And at the same time.

[0008] The invention according to claim 3 is characterized in that the metal cover plate is formed to a thickness that can be bent by its own weight, and is set in a mold while being bent by its own weight.

[0009] The invention according to claim 4 is characterized in that the frame is formed in accordance with the shape of the acoustic portion, and then the frame is mounted on a peripheral end surface of the metal cover plate. In the invention according to claim 5, a sound having a built-in speaker is provided.
It has a long sound-emitting surface on the top side of the
A grill is formed on the sound emitting surface of the
Electronic keyboard musical instrument with a cover
A sound device main body having an engaging portion, a metal cover plate made of a perforated metal thin plate, and a resin for protecting an edge of the metal cover plate having an elastic piece engaged with the engaging portion. made of a material, the the frame of the attachment and protection of the metal cover plate consists, by fitting the frame body around the edge of the metal cover plate forming the grill cover, the elastic pieces and / or metal An electronic keyboard, wherein the elastic piece is elastically engaged with the engaging portion by elasticity of a cover plate and / or a frame body.
An acoustic device for a musical instrument is provided.

[0010]

According to the first aspect of the present invention, a perforated metal cover plate is first formed from a thin metal plate, and a resin frame in which an elastic piece for mounting is integrated is attached to the periphery of the metal cover plate. Form a grill cover. The grill cover is elastically engaged with the front surface of the sound emitting portion (grill) of the main body of the acoustic device and attached. The grill cover is composed of a combination of a metal material and a resin material.

In the invention according to claim 2, the frame is formed on the metal cover plate by outsert molding, so that the frame is formed and mounted on the metal cover plate at the same time.

In the third aspect of the present invention, the metal cover plate is set in a mold in a state of being bent by its own weight during outsert molding. This increases the degree of freedom in the shape of the mold used.

In the invention according to the fourth aspect, the grill cover is formed by separately forming the metal cover plate and the frame, and attaching the completed frame to the periphery of the metal cover plate. According to this method, the frame can be divided and formed, and the mold structure can be simplified.

In the invention according to claim 5, the grill cover is formed by fitting a frame for attachment and protection made of resin into the peripheral edge of the metal cover plate. The grill cover is elastically engaged with and attached to the engaging portion of the audio device main body.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a grill cover according to an embodiment of the present invention, wherein (A) is a plan view, (B) is a right side view, and (C).
Is a side view (front view) as viewed from below. (B)
The figure is a side view showing the right part of the figure from the vicinity of the line B in FIG. Edge 1 at the periphery of metal cover plate 1 made of punched metal formed by punching a thin metal plate
The frame 2 made of a resin material is mounted on 6. This frame 2
Consists of an upper frame 2a, a lower frame 2b, a left frame 2c, and a right frame 2d, and elastic pieces 3 for attachment are integrally formed at appropriate positions. The metal cover plate 1 and the frame 2 constitute a grill cover 4 that covers a grill on a sound emitting surface of the instrument body described later. A hook 3a is formed at the tip of the elastic piece 3 for attachment, and the grill cover 4 is attached to the instrument main body side by means of a resilient snap connection with an engaging portion on the instrument main body side described later. The upper, lower, left and right frames 2a,
2b, 2c, and 2d may be formed separately or may be integrally formed by outsert.

The length L of the metal cover plate 1 is about 500 mm or more corresponding to the length of the sound emitting portion of a normal electronic keyboard instrument. The width W changes little by little depending on the curved shape of the upper and lower edges 16, but is substantially constant, and forms a long shape on the left and right as a whole. The thickness of the metal cover plate 1 having such a size and shape is such that, for example, if the metal cover plate 1 is horizontally supported at the left and right edges 16, the central portion is lowered and bent by its own weight.

When manufacturing such a grill cover 4, first, a thin metal plate is punched to form a punched metal, which is cut into a predetermined shape to form a metal cover plate 1. Next, the metal cover plate 1 is set in a mold, and the frame member 2 together with the elastic piece 3 is integrally molded with the peripheral edge 16 of the metal cover plate 1 by outsert molding of resin. Thereby, the formation of the frame member 2 and the attachment to the metal cover 1 are performed simultaneously. By adopting such a manufacturing process by simultaneous molding and mounting, the manufacturing and assembling steps are shortened and simplified, and reliable assembly and integration are achieved, and the reliability of the manufacturing is increased.

FIG. 4 shows a cross-sectional structure of a mold used for simultaneous integral molding by such outsert molding of a resin.
The metal cover plate 1 is set between the upper mold 20 and the lower mold 21. A cavity 22 corresponding to the frame member 2 and a cavity 23 corresponding to the elastic piece 3 are formed in an outer peripheral portion of the metal cover 1.
Resin is injected through 4. The lower mold 21 is provided with a protruding bar 26 for extruding the molded body. Also, an undercut portion 25 is provided inside the elastic piece cavity 23 in the upper mold 2.
The undercut portion 25 is detached from the upper die 20 by opening and closing the die by an interlocking mechanism (not shown) in the die removing step.

When the metal cover plate 1 is set in a mold, the metal cover plate 1 can be set in a state of being bent by its own weight within the cavity space. For example, a different type of punching metal is set within a range where the shape and / or thickness of the metal cover plate 1 is the same,
By differentiating at least one of the upper and lower molds , different outsert molded products can be formed even if the molds are partially or completely the same, and the use range of the molds is expanded.

Further, instead of such a simultaneous integral forming method by outsert molding of the resin, each frame 2a,
The frames 2b, 2c, and 2d may be separately formed by resin injection molding, and the formed frames may be fitted and attached to the peripheral edge of the metal cover plate 1. By dividing each frame in this way, the mold can be reduced in size and simplified, and the cost can be reduced.

FIG. 2 is a plan view showing the upper surface of a part of the upper case constituting the electronic musical instrument according to the present invention.
FIG. 3 is a view showing a cross-sectional shape of the upper case 5 in a III-III portion of FIG.

The upper case 5 includes a sound section 6 and a performance operation section 7.
A keyboard (not shown) is incorporated at a keyboard position 8 of the performance operation unit 7, and a rotary wheel (not shown) for controlling volume and various musical sounds is mounted at a wheel position 9.
A speaker (not shown) is provided at a speaker position 10 in the sound unit 6, and a tweeter (not shown) for reproducing high-pitched sounds is provided at a tweeter position 11. The upper surface of the speaker position 10 and the tweeter position 11 of the sound unit 6 becomes a sound emitting surface 12.

As shown in FIG. 3, a grill 17 is formed on the sound emitting surface 12 of the sound section 6. This grill 17
Is composed of two types of patterns A and B as shown in the figure. The pattern B is a plastic molded body of a continuous waveform pattern 17b, and the pattern A is a pattern in which an opening 17a is formed on one side of each wave of this waveform. This pattern A is provided immediately above the sound emitting surface of a speaker or a tweeter.

A groove 13 is formed around the grill 17. A slit 14 for attaching a grill cover is provided in the groove 13 so as to correspond to the elastic piece 3 for attaching the grill cover 4. The mounting elastic piece 3 is inserted into the slit 14, and the hook 3a at the tip of the mounting piece 3 protrudes below the slit and is elastically locked. Reference numeral 15 denotes a boss for fixing the case, which couples the upper case 5 and the lower case by screwing from the lower case side (not shown).

The metal cover plate 1 constituting the grill cover 4 is not limited to a punched metal, but may be a porous thin plate-shaped metal member such as a mesh material or another lattice-like material.

[0026]

As described above, according to the present invention, a grille cover is constructed by integrally mounting a frame material made of a resin material together with a mounting elastic piece around a metal cover plate made of a metal material. Therefore, it is possible to easily obtain a curved shape conforming to the shape of the mounting portion by the resin material while maintaining sufficient strength by the metal member, and to simplify the configuration of the mold and reduce costs such as mold costs and component costs. be able to. The grille cover is attached to the main unit using the elasticity of the metal cover plate, the frame, and the elastic piece itself. Therefore, when the present invention is applied to an acoustic device, the acoustic device can be used without causing so-called chattering such as vibrating or resonating with another device even for a loud sound.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are a plan view, a right side view, and a front view, respectively, of a grill cover according to an embodiment of the present invention.

FIG. 2 is a top view partially showing an upper case of an electronic keyboard instrument to which the present invention is applied;

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a configuration diagram showing a cross section of a mold for outsert molding used in the present invention.

[Explanation of symbols]

1: metal cover plate, 2, 2a, 2b, 2c, 2d: frame, 3: elastic piece, 3a: hook, 4: grill cover, 5:
Upper case, 6: sound part, 12: sound emitting surface, 13: groove, 1
4: Slit for grill cover attachment, 16: Edge.

Claims (5)

(57) [Claims] 1. A keyboard on an upper surface side of an acoustic section containing a speaker.
An electronic key having a long sound-emitting surface on the left and right along with a grille formed on the sound-emitting surface, and a grill cover attached over the grill.
A method for manufacturing an acoustic device for a board instrument , having a predetermined width, at least a total length of 500 mm or more , and
When supported horizontally by the left and right edges, the center due to its own weight
A step of forming a metal cover plate by performing a porosity process on a thin metal plate having a thickness such that the portion is curved down, and a frame body made of a resin material for protecting an edge of a peripheral end surface of the metal cover plate, integrally formed with the mounting elastic piece to the acoustic apparatus body, and forming the grill cover the frame and attached to the peripheral edge face of the metal cover plate, the grill cover, the elastic piece and / or the elasticity of the metal cover plate and / or frame, electrostatic and a step of elastically anchoring to the acoustic portion of the acoustic apparatus body
A method for manufacturing an acoustic device for a child keyboard instrument . 2. The metal cover plate is set in a mold,
The method for manufacturing an acoustic device according to claim 1, wherein the forming of the frame and the attachment to the metal cover plate are performed simultaneously by outsert molding a resin material to the metal cover plate. 3. The method according to claim 2, wherein the metal cover plate is formed to have a thickness that can be bent by its own weight, and is set in a mold while being bent by its own weight. 4. The manufacturing of the acoustic device according to claim 1, wherein the frame is formed according to the shape of the acoustic portion, and then the frame is attached to a peripheral end surface of the metal cover plate. Method. 5. A keyboard on an upper surface side of an acoustic section containing a speaker.
An electronic key having a long sound-emitting surface on the left and right along with a grille formed on the sound-emitting surface, and a grill cover attached over the grill.
An acoustic device for a board instrument, comprising: an acoustic device main body having an engagement portion; a metal cover plate made of a perforated metal thin plate; and an elastic piece engaged with the engagement portion. A frame for mounting and protecting the metal cover plate, which is made of a resin material for protecting the edge;
From it, it is fitted to the frame body around the edge of the metal cover plate forming the grill cover, by the elasticity of the elastic pieces and / or metal cover plate and / or the frame, the engagement of the elastic piece An acoustic device for an electronic keyboard instrument , which is elastically attached to a part.