JPH08331681A - Acoustic device - Google Patents

Abstract

PURPOSE: To manufacture the acoustic devices of two or more other product models from a metallic mold by mounting the grille cover composed of punching metal, etc., as a separate model on a resin grill. CONSTITUTION: The grill 17 on the sound emitting surface 12 of an acoustic part 6 is the integrally formed body of the resin which is formed at the same time as an upper case 5 by a metallic mold. Around the grille 17, a groove 13 is formed. At the bottom part of the groove 13, a slit 14 for mounting a grille cover is provided. The grill cover composed of punching metal performs the snap-coupling with the slit 14 for the elastic piece for mounting and the cover is mounted on the grille 17. As a result, because the product of an other model which is different from the product on which the grille cover is not mounted is formed and various kinds of grille covers are exchanged, two or more other products can be easily formed by using a common metallic mold.

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 more particularly to an acoustic device in which a grill of an acoustic portion is molded with resin.

[0002]

2. Description of the Related Art In an audio device such as an electronic musical instrument, an acoustic part such as a speaker is housed in a case forming an outer frame, and a sound emitting and decorative grill is provided on an acoustic output surface of the acoustic part. Conventionally, such a grill has been integrally formed on the sound emitting surface with resin together with the case of the main body, or formed of a metal plate such as punching metal and attached to the sound emitting surface of the resin case.

[0003]

However, in the conventional acoustic apparatus, in the structure in which the grill is integrally molded with the case with the resin, the grill of punching metal is not attached because it is not necessary. Further, in the configuration in which the punching metal grill is attached, the sound emitting surface on the case side is simply a flat surface without any processing, only by appropriately forming sound emitting holes, and is not provided with decorativeness.

Therefore, it is necessary to prepare different cases for the acoustic devices having the same outer shape except for the grill portion. For this reason, it is necessary to separately prepare a mold for each model for different product models having almost the same outer shape, which results in a large cost for mold manufacturing and complicated manufacturing control. .

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object thereof is to provide an acoustic device capable of producing a resin case by using a common mold for product models having partially different outer shapes. To do.

[0006]

In order to achieve the above-mentioned object, in the invention according to claim 1, the case body made of resin has a built-in acoustic part, and the sound emitting surface of the case body has a grill. There is provided an audio device, which is formed of a resin integrated with a body, characterized in that mounting means for mounting a grill cover on the upper surface of the grill is integrally formed with the case body.

The invention according to claim 2 is characterized in that the mounting means of the grill cover is composed of a groove provided around the grill and a plurality of holes provided at the bottom of the groove.

Further, in the invention according to claim 3,
The grill comprises a first pattern having a sound emitting slit and a second pattern having no opening. The grill cover mounting hole is slit-shaped on the grill surface and can be used for sound emitting. It is characterized by being.

[0009]

In the invention according to claim 1, the grill is integrally formed with the resin case body on the sound emitting surface of the acoustic portion, and the grill cover mounting means is integrally formed with the grill with resin on the case body. Therefore, the grill cover made of punching metal or the like can be mounted on the resin grill as another grill, and the acoustic device of two different product models can be manufactured from one mold. In this case, since the mounting means is integrally molded together with the grill, the manufacturing process of the case body does not increase, and two separate products can be easily formed using a common mold.

According to the second aspect of the invention, the attachment means of the grill cover comprises a groove around the grill and a plurality of holes provided at the bottom of the groove, and an attachment piece having elasticity on the grill cover side is inserted into the hole. Then, attach the grill cover on the case body. In this case, since the hole on the case body side is formed at the bottom of the groove, even if the product is not equipped with the grill cover, it is difficult to see from the outside and the appearance is not damaged.

In the invention according to claim 3, the hole for attaching the grill cover is a slit-like long hole when the grill surface is viewed from above, and when the grill cover is not attached, the hole is made of resin. Along with the slit for sound emission provided in the, it plays the role of assisting the sound emission from the acoustic part.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a top view showing a part of an upper case 5 of a case body composed of upper and lower cases constituting an electronic musical instrument body according to the present invention. In addition, FIG. 2 shows II-I of FIG.
It is a figure which shows the cross-sectional shape of this upper case 5 in I part.

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

The sound emitting surface 12 of the acoustic section 6 has a grill 1
7 is formed integrally with the upper case 5. This grill 17
Is an integrally molded body of resin formed simultaneously with the upper case 5 by a mold, and is composed of two kinds of patterns, a first pattern A and a second pattern B, as shown in the figure.
The pattern B is a molded body of continuous waveform patterns 17b, and the pattern A is a pattern in which a slit-shaped sound emitting hole 17a is opened on one side of each wave of this waveform. The pattern A having the sound emitting holes 17a is provided right above the sound emitting surface of the low / medium tone speaker or the tweeter (treble speaker).
The sound from the speaker is emitted through the path indicated by the arrow ar in FIG.

A groove 13 is formed around the grill 17. At the bottom of the groove 13, a slit (through hole) 14 for attaching a grill cover, which will be described later, is provided in the shape of an elongated hole along the groove 13. The slit 14 assists sound emission from the acoustic portion. In order to further assist this action, a plurality (2-5) is further provided between the slits 14 shown in the figure.
The slits may be provided in the same shape.
It should be noted that some of these slits are only dummy as fitting holes for the grill cover mounting locking pieces (protrusions 3a described later). A case fixing boss 15 connects the upper case 5 and the lower case by screwing from the lower case side (not shown).

FIG. 3 shows an example of the shape of the grill cover according to the embodiment of the present invention. A frame body 2 made of a resin material is attached to an edge 16 of a peripheral edge portion of a metal cover plate 1 made of punching metal formed by punching a thin metal plate. The frame body 2 includes 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. In addition, this elastic piece 3
Are formed corresponding to the positions of the slits 14 at the bottom of the groove 13 provided around the grill of the upper case 5 (in this example, they do not match for simplification of the drawing). 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 of the upper and lower edges 16 varies slightly depending on the location, but is almost constant, and forms a shape that is long in the left and right as a whole. The upper, lower, left and right frames 2a, 2 of the frame 2
b, 2c and 2d may be formed separately or may be integrally formed.

The metal cover plate 1 and the frame body 2 constitute a grill cover 4 for covering the grill 17 of the sound emitting surface 12 on the side of the instrument body. The protrusion 3a is formed at the tip of the elastic piece 3 for mounting, and the grill cover 4 is mounted on the grill 17 on the instrument body side by elastic snap connection with the slit 14 of the upper case 5 on the instrument body side. . That is, when the grill cover 4 is mounted on the grill 17 of the upper case 5, the elastic piece 3 on the grill cover side is attached to the grill 1.
7 is inserted into the groove 13 around it, and the projection 3a at its tip is further inserted.
The protrusion 3a is elastically locked to the bottom of the groove 13 by inserting the slit 14 into the slit 14 and projecting it downward, and the grill cover 4 is fixedly held on the upper case 5.

As described above, by mounting the grill cover 4 as a new grill on the grill 17 which is integrally formed on the upper case 5 in advance, a model different in appearance from a product without the grill cover 4 is installed. The product is formed.

When the grill cover 4 is not attached, the upper case 5 has the grill 17 having a decorative property, and thus can be used as it is as a model of a product. In this case, the user's line of sight when actually using this electronic keyboard instrument is a direction from diagonally above and in front of the instrument, as shown in FIG. At this time, the groove 13 on the front side (left side in FIG. 2) of the grill 17 is formed with a slight inclination so that the bottom is hard to see, and the depth D to the bottom where the slit 14 is formed has a line of sight. It is so deep that it does not exist. Further, the groove 13 on the rear side of the grill 17 is formed at a position further lower than the upper surface of the grill and blocked by the back surface of the case. Therefore, regarding the product model in which the grill cover 4 is not attached, the slit 14 in the groove 13 of the grill 17 is
Is almost never in the line of sight, and the appearance is not spoiled. In this case, in order to make the slits 14 more difficult to see, it is desirable that each of the slits 14 be formed at the bottom of the groove 13 as far as possible from the front.

In the model in which the grill cover 4 is not attached as described above, the slit 14 in the groove 13 is opened to the sound emitting surface 12, so that the acoustic portion 6 passing through the slit-like sound emitting hole 17a of the pattern A of the grill 17 is removed. Assists the sound emitting effect of.

The slit as the dummy fitting may be a corresponding hole of the true mounting projection 3a in different models. In other words, when the speaker position and the like need to be slightly different, the true hole of another model becomes a dummy hole, and it is possible to assist the sound emission action.

[0022]

As described above, in the present invention, the grill is integrally formed with the upper case (case body) of the resin on the sound emitting surface of the acoustic section, and the case body is formed with the groove and the slit at the bottom thereof. The grill cover mounting means is integrally molded with resin simultaneously with the grill. Therefore, by mounting the grill cover made of punching metal or the like on the resin grill as another grill, another product model can be easily formed from one product model. That is, it is possible to manufacture two or more acoustic devices of different product models from one mold, the versatility of the mold is increased, the manufacturing control is facilitated, and the cost is reduced. In this case, since the attachment means of the grill cover is integrally formed at the same time as the grill, the manufacturing process of the case body does not increase, and by exchanging the grill covers variously, two or more can be easily performed by using the common mold. Further products can be formed.

In this case, since the slit on the case body side is formed at the bottom of the groove having a certain depth, even if the product is not equipped with the grill cover, it is difficult to see from the outside and the appearance is not damaged.

Further, since the slit at the bottom of the groove for attaching the grill cover opens on the same sound emitting surface as the grill, when the grill cover is not attached, the slit is a sound produced by the sound emitting hole provided on the resin grill. Plays an auxiliary function of sound emission from the part. Therefore, this slit also has an effect on the sound emission function.

[Brief description of drawings]

FIG. 1 is a top view showing a part of an upper case constituting an electronic keyboard instrument main body according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of the upper case of FIG.

FIG. 3 is a top view showing an example of the shape of the grill cover according to the embodiment of the present invention.

[Explanation of symbols]

1: punching metal (metal cover plate) 2: frame
3: elastic piece, 4: grill cover, 5: upper case, 6: acoustic part, 10: speaker position, 11: tweeter position, 1
2: Sound emitting surface, 13: Groove, 14: Grill cover mounting slit, 17: Grill.

Claims (3)

[Claims] 1. An acoustic device in which a case body made of resin has a built-in acoustic part, and a sound emitting surface of the case body has a grill formed of resin integrated with the case body, wherein a grill cover is provided on an upper surface of the grill. An acoustic device, characterized in that mounting means for mounting the device is provided integrally with the case body. 2. The acoustic device according to claim 1, wherein the mounting means includes a groove provided around the grill and a plurality of holes provided at a bottom portion of the groove. 3. The grill comprises a first pattern having sound emission slits and a second pattern having no openings, and the grill cover mounting holes are slit-shaped on the grill surface and emit sound. The acoustic device according to claim 2, wherein the acoustic device is usable as a sound source.