JPH06276592A - Electronic musical instrument - Google Patents

Abstract

PURPOSE:To obtain an electronic musical instrument where a sufficiently long speaker duct for bass reflex structure is possible to be formed without enlarging an occupancy area within a body. CONSTITUTION:In an electronic musical instrument, a speaker 2 is stored within a body part composed of an upper case 1 and a lower case 5 and a bass reflex discharging sound port 6 is provided on the body part. A wall 3 directing from the side of the upper case 1 to the side of the lower case 5 and a wall 4 directing from the side of the lower case 5 to the side of the upper case 1 are adjacently arranged and formed, a folding back path 18 is formed by the both walls and this folding back path 18 is made to communicate with the bass reflex discharging sound port 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument, and more particularly to an electronic musical instrument having a bass reflex type speaker box structure.

[0002]

2. Description of the Related Art A speaker for an electronic musical instrument is usually housed in a closed speaker box in order to improve sound emission characteristics. It is desirable to increase the volume in order to improve the bass frequency characteristics of such a closed speaker box. However, particularly in a portable type electronic keyboard musical instrument or the like, there is a case where the volume of the speaker box cannot be made large, and therefore, a structure in which a bass reflex port is formed in the speaker box is adopted in order to enhance the low frequency range. .

In this bass reflex type speaker box, a speaker is housed in a casing consisting of an upper case and a lower case constituting a musical instrument body, and a sound emission port (bass reflex port) is opened on the front or side of the casing. An acoustic passage communicating with the speaker is formed in the housing, and part of the sound radiated from the back of the speaker is guided to the bass reflex port through this acoustic passage, and the sound from the back of the speaker is transmitted through the bass reflex port to the sound from the front of the speaker. It is configured to radiate in phase with. The acoustic passage leading to such a bass reflex port requires a predetermined length and passage area corresponding to the frequency in order to match the phase with the sound from the front surface of the speaker and emit the sound with the optimum frequency characteristic.

In the conventional electronic musical instrument having the bass reflex type speaker box structure, the speaker duct (acoustic passage) leading to the bass reflex port is formed substantially parallel to the upper and lower surfaces of the housing (Japanese Utility Model Publication No. 2-98396). reference).

[0005]

However, in the above-mentioned conventional electronic musical instrument having the bass reflex structure, the speaker duct is provided in parallel (horizontal direction) to the upper and lower surfaces of the housing, so that the duct having the required length is formed. However, there is a problem that the instrument body becomes large because it occupies a lot of area.

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 electronic musical instrument capable of forming a speaker duct for a bass reflex structure having a sufficient length without increasing an occupied area in a housing. And

[0007]

In order to achieve the above object, according to the present invention, a speaker is housed in a housing portion consisting of an upper case and a lower case, and a bass reflex sound output port is provided in the housing portion. In the musical instrument, a wall body that extends from the upper case side to the lower case side and a wall body that extends from the lower case side to the upper case side are formed adjacent to each other to form a folding path by both wall bodies, and It communicates with the bass reflex sound emission port.

[0008]

The wall body perpendicular to the upper and lower surfaces is provided so as to project from the upper case and the lower case in the facing direction, and an appropriate gap is provided between both wall bodies, and the tip of the wall body and the facing member of the mating case are provided. By providing an appropriate gap between the two, a folded passage is formed in a direction perpendicular to the upper and lower surfaces of the housing.
The folding path constitutes an acoustic path communicating with the bass reflex port.

[0009]

1 and 2 show an electronic musical instrument according to an embodiment of the present invention. FIG. 1 is a perspective view of an electronic musical instrument body consisting of upper and lower cases which are turned upside down to remove the floor surface of the lower case, and FIG. 2 is a cross-sectional view showing a state in which the upper and lower cases are combined. .

The upper case 1 and the lower case 5 (FIG. 2) form a casing that constitutes the main body of the musical instrument, and the speaker 2 is exposed to the front of the upper case (lower side in FIG. 1) of the upper case in this casing. The speaker box is housed with the sound part facing to form a speaker box. The cylindrical wall 3 extends vertically from the upper case 1 to the lower case 5 side.
Is provided so as to project. A cylindrical wall body 4 is provided outside the cylindrical wall body 3 so as to surround the cylindrical wall body 3 in a vertical direction from the lower case 5 toward the upper case 1 side. The front end surfaces of both wall bodies 3 and 4 are separated from the inner surfaces of the opposing lower case 5 and upper case 1 respectively. In this way, the cylindrical walls 3, 4
By adjoining each other at intervals (in this example, one surrounding the other), a space 17 between both wall bodies 3, 4 and an acoustic passage space 7 inside the inner cylindrical wall body 3 are formed. Thus, the turn-back passage 18 indicated by the arrow is formed.

A bass reflex port 6 is opened on the upper surface of the upper case 1, and an internal acoustic passage space 7 of the cylindrical wall 3 communicates with the bass reflex port 6. As a result, a folding passage 18 is formed in the vertical direction with respect to the upper and lower surfaces of the musical instrument body housing consisting of the upper case 1 and the lower case 5, and the folding passage 18 constitutes a speaker duct communicating with the bass reflex port 6. The electronic sound emitted from the speaker 2 is emitted from the front surface thereof through a grill (not shown) provided in the upper case, and from the rear surface of the speaker 2 through a speaker duct formed of a vertical folding path 18. Sound is emitted through the bass reflex port 6 to obtain a bass reflex effect. As described above, the speaker ducts folded in the vertical direction are formed by adjoining the walls in the vertical direction to the upper and lower surfaces of the housing (including the case where one wall is adjacent to the other in a form surrounding the other). Thus, the bass reflex acoustic passage having a sufficient length can be formed within a small occupied area. Further, in this case, since the facing front end surfaces of the wall bodies projecting from the upper and lower cases to the opposite case side are separated from the other case member, chattering due to vibration does not occur and high quality musical sound is generated. You can

FIG. 3 is a sectional view of an essential part of an electronic musical instrument having a bass reflex structure according to another embodiment of the present invention. In this embodiment, the cylindrical wall 3b is further provided adjacent to the cylindrical wall 4 of the lower case 5 (covering the outer periphery) from the upper case 1 toward the lower case 5 in the embodiment of FIGS. Is provided. In this way, the cylindrical walls 3, 4, and 3b are alternately arranged in the vertical direction so as to cover the outer side and adjacent to each other, and the cross section of the walls is formed in a labyrinth shape (interdigit shape). The length of the return passage 18 can be further increased. Other configurations, operations, and effects are similar to those of the above-described embodiment.

FIGS. 4A and 4B are sectional views of the essential parts of an electronic musical instrument having a bass reflex structure according to still another embodiment of the present invention. These examples are for bass reflex port 6
Shows an example in which the side surface of the upper case 1 is opened.
In the configuration of FIG. 1A, a cylindrical wall body 8 having a passage in the vertical direction (up and down direction) is formed continuously with the acoustic passage space 7 communicating with the bass reflex port 6 on the side surface of the housing. A cylindrical wall body 4 is provided around the lower case side from the lower case side. As a result, similar to the above-described embodiment, the vertical folding path 18 is formed.

FIG. 4B is similar to the embodiment of FIG.
(A) The folding wall 18 is provided by surrounding the cylindrical wall body 4 having the configuration shown in FIG.
It is a lengthened version of. The bass reflex port 6 on the side surface of the housing may be provided in a member other than the upper case in order to simplify the structure of the mold or the like. In addition, in each of the above-described embodiments, the shape of each wall body forming the turnback passage 18 is
The shape is not limited to a cylinder, and may be a cylinder having a rectangular shape or other shapes. Further, each of the embodiments can be applied not only to an electronic keyboard instrument but also to an electronic percussion instrument having a built-in speaker.

FIG. 5 is a perspective view of an electronic musical instrument having a bass reflex structure according to another embodiment of the present invention. Similar to FIG. 1, this figure is a view in which the housing constituting the instrument body is turned upside down and the floor surface of the lower case is omitted. 6 is a main-portion cross-sectional view taken along the Y direction of FIG. 5, and FIG. 7 is a main-portion cross-sectional view taken along the X direction of FIG.

In this embodiment, a bass reflex port 6 is provided on the side surface of the upper case 1, a wall 9 is provided on the inner surface of the upper case 1 to form an acoustic passage, and the upper case side wall 9 is formed. The wall body 10 is provided from the lower case side so as to surround the. An opening 9a for an acoustic passage is formed at the lower end of the wall 9 on the upper case side. With this configuration,
As shown in FIG. 6, an acoustic passage (folded passage) 18 folded back in the vertical direction by the internal acoustic passage space 7 communicating with the bass reflex port 6, the opening 9 a of the wall 9 and the space between both walls 9 and 10. Is formed. As a result, similar to the above-described embodiment, the bass reflex speaker duct having a sufficient length can be formed without increasing the occupied area. In this embodiment, when the side edge portion 10a of the wall body 10 provided on the lower case 5 abuts on the inner surface of the upper case 1, a suitable cushion is provided to prevent vibration from this portion. Material may be provided.

FIG. 8 is an overall side view of the portable electronic keyboard instrument according to each of the above embodiments, in which the bass reflex port 6 is opened on the side surface. As described above, the musical instrument body 12 which is a housing in which the upper case 1 and the lower case 5 are combined is installed on the table 11 for performance. White key 13 on the upper case 1 side
A black key 14 is provided at a predetermined position, and a wheel operator 15 for controlling various musical sounds is provided.

FIG. 9 is a top view showing an end portion of the upper case 1 of the electronic musical instrument according to the embodiment of the present invention. Upper case 1
A bass reflex port 6 is provided on a side surface of an end portion of the. Opening 1
An operation control panel (not shown) equipped with a keyboard, a wheel operator, and other operation keys is attached to the unit 6.

[0019]

As described above, the wall bodies are provided vertically adjacent to the upper and lower surfaces of the housing constituting the speaker box of the electronic musical instrument in the vertical direction, thereby forming the folding path in the vertical direction. Therefore, a speaker duct having a sufficient length can be formed in a narrow space, and a large bass reflex effect can be obtained even with a speaker box having a small volume. The size can be reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a bass reflex type electronic musical instrument according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part of the embodiment shown in FIG.

FIG. 3 is a cross-sectional view of a main part of a bass reflex type electronic musical instrument according to another embodiment of the present invention.

FIGS. 4A and 4B are cross-sectional views of essential parts of a bass reflex electronic musical instrument according to still another embodiment of the present invention.

FIG. 5 is a partially cutaway perspective view of a bass reflex type electronic musical instrument according to still another embodiment of the present invention.

FIG. 6 is a cross-sectional view of main parts in the Y direction of the embodiment of FIG.

FIG. 7 is a cross-sectional view of an essential part in the X direction of the embodiment of FIG.

FIG. 8 is a side view of an electronic musical instrument to which the present invention is applied.

FIG. 9 is a top view of an upper case end portion of an electronic musical instrument to which the present invention is applied.

[Explanation of symbols]

1: Upper case, 2: Speaker, 3: Wall body, 4: Wall body, 5: Lower case, 6: Bass reflex port, 7: Internal acoustic passage space, 18: Return passage.

Claims (1)

[Claims] 1. An electronic musical instrument, in which a speaker is housed in a housing portion composed of an upper case and a lower case, and a bass reflex sound output port is provided in the housing portion, a wall body extending from the upper case side to the lower case side. An electronic device characterized in that a wall body extending from the lower case side to the upper case side is formed adjacent to each other to form a folding path by both wall bodies, and the folding path is communicated with the bass reflex sound emission port. Musical instrument.