JPH08137474A - Electronic musical instrument - Google Patents

Abstract

PURPOSE: To provide musical sounds having a good balance in medium to high frequencies for a player and the audience at a low cost by arranging a back plate having an angle under main speakers. CONSTITUTION: Main speakers 4 are installed facing downward on a shelf 7 and a back plate 6 having a bended section with an angle is placed under the speakers 4. Having this constitution, musical sounds radiated from the speakers 4 are reflected by the plate 6 and re-radiated to the audience. In this case, the inclined angle between the speakers 4 and the plate 6 is necessary to be adjusted so that the concentrated section of the reflected sound by the plate 6 is directed toward the audience. Thus, the audience are able to directly hear not only the lower frequencies but also middle and higher frequency components of the sound with a proper sound volume balance. Further, the amount of sounds reflected by the floor is considerably reduced resulting in the reduction of the adverse effect caused by the flooring material.

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 in which a main speaker is attached downward, and an electronic musical instrument which can emit a sound in a whole range from low to high tones in good balance at low cost.

[0002]

2. Description of the Related Art FIG. 7 (a) is a front view showing a schematic structure of a conventional electronic musical instrument, and FIG. 7 (b) is a side view thereof for explaining the arrangement of a speaker and a back plate.

As shown in the figure, in a conventional electronic musical instrument, a main speaker 4 is attached to a lower side of a shelf plate 7 so as to face a listener, and a speaker for middle and high range 5 is an upper part of the shelf plate 7. It is installed in the direction of the player.

The back plate 6 is installed vertically to the floor. It should be noted that this back plate 6 is generally installed in order to express a high-class appearance of an electronic musical instrument.

In the conventional electronic musical instrument having such a structure, since the main speaker 4 is attached to the listener as shown in FIGS. 7A and 7B, the directivity as shown in FIG. Not only low-pitched low-pitched sound but also high-directional mid-to-high range component sound reaches the listener directly. Therefore, the listener
You can hear rich musical sounds with well-balanced components in the low range, middle range, and high range.

However, in order to attach the main speaker 4 to the listener as described above, the speaker box for accommodating the speaker becomes large in size, the strength for withstanding one side load of the speaker is required, and the electronic musical instrument is required. There are various drawbacks such as the need to dispose the saran net 9 in order to increase the appearance of the instrument, and measures must be taken to make up for this, which causes an increase in the cost of the musical instrument.

For this reason, in recent years, in order to save the material cost and the labor cost required for manufacturing the electronic musical instrument and to reduce the cost, many of the main speakers 4 are attached downward.

In the past, a simple back plate was provided on the back surface of the musical instrument, but the back plate is stretched over a part of the back surface of the musical instrument, and there is a gap above or below the back surface. Since the low-pitched musical sound escapes from the gap, the low-pitched sound becomes insufficient in volume, and the back surface of the musical instrument is recently lacking in high quality because the back surface can be seen through.
Is being used.

9 (a) and 9 (b) show the structure of an electronic musical instrument in which the above-mentioned main speaker 4 is attached downward, which is intended to reduce the cost. FIG. 10 shows the frequency bands of the electronic musical instrument. The sound propagation situation of is shown.

In FIGS. 9 (a) and 9 (b), the main speaker 4 is a full-range speaker that reproduces from the low-pitched sound region to the high-pitched sound region. Of the musical sounds emitted, the sound in the low-pitched sound region has a small directivity. As shown in FIG. 10, both the performer and the listener are sufficiently reached.

Further, by using the back plate 6 on the back surface of the musical instrument as described above, it is possible to express a high-class feeling of the musical instrument, and the bass is prevented from escaping from the back side of the musical instrument, so that the volume of the bass is low. Can be increased.

However, as shown in FIG. 10, since the musical sound in the mid-high range having a large directivity is reflected on the floor and is reflected upward, it is difficult to reach the listener, and the volume of the musical sound in the mid-high range is insufficient. Has become.

Further, the musical sound of the mid-high range component emitted from the main speaker 4 toward the floor is influenced by the material of the floor. In other words, the sound quality of the musical sound changes due to the strength of sound absorption or the strength of reflection of the floor.

On the other hand, the mid-high range speaker 5 installed on the shelf 7 is to emit sound to the performer.
Sufficient volume cannot be secured at the listener's position.

Therefore, as described above, in the conventional electronic musical instrument,
An electronic musical instrument that provides a well-balanced musical sound that a listener hears a large amount of low-pitched sound and a small amount of mid- and high-pitched sound, has been desired to be improved.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an electronic musical instrument which is low in price and which can provide the performer and listener with rich and high-pitched tones. The purpose is to

[0017]

SUMMARY OF THE INVENTION The present invention is an electronic musical instrument in which a main speaker 4 is attached downward, and an angled back plate 6 is arranged below the main speaker 4.

The angled back plate 6 is bent at a constant angle so that the musical sound from the main speaker 4 is reflected toward the listener.

The angled back plate 6 is inclined at a certain angle so that the musical sound from the main speaker 4 is reflected toward the listener>

Further, the angled back plate 6 is characterized in that it is surface-treated in order to efficiently reflect a musical sound.

[0021]

The electronic musical instrument according to the present invention is an electronic keyboard musical instrument in which the main speaker 4 is attached downward, and an angled back plate 6 having a fixed sound reflection angle is set below the main speaker 4. By arranging them, the musical sound in the mid-high range generated from the main speaker 4 is reflected toward the listener.

According to the present electronic musical instrument, since the electronic musical instrument has the back plate, the aesthetic appearance of the electronic musical instrument can be maintained, and the sound of the middle and high range components can be directly transmitted to the listener present at a position away from the main body of the musical instrument. By being radiated, a well-balanced and rich musical sound can be provided.

Furthermore, the dense portion of the sound reflected from the angled back plate 6 of the musical sound in the mid-high range generated from the main speaker 4 is bent and attached at a certain angle so that the listener can directly reach the listener.

As a result, the musical tone of the mid-high range component is directly heard by the listener who is far from the instrument body, and the volume of the musical tone of the mid-high range component is not insufficient, and the sound is well-balanced. Can be provided.

By forming the angled back plate 6 into a single plate without bending the back plate 6, the structure is simpler and the back plate can be easily attached, so that a lower cost electronic musical instrument can be provided.

By processing the surface of the angled back plate 6 having a high sound reflectance, for example, coating it with vinyl chloride or the like, it is possible to prevent the sound from being attenuated or diffusely reflected, and to the listener. It is possible to provide a richer sound.

As described above, according to the electronic musical instrument of the present invention, it is possible to supply a well-balanced musical tone even when the electronic musical instrument has the speaker attached downward.
It is possible to reduce the size and cost of a musical instrument without impairing the high quality of the musical instrument.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of a schematic configuration of an electronic musical instrument according to the present invention, in which a main speaker 4 is attached below a shelf plate 7 downward, and a bent angled back plate 6 is arranged below the main speaker 4. It shows the installed state.

The present invention can also be applied to an electronic musical instrument in which the main speaker 4 is mounted downward on the shelf 7 as shown in FIG.

In the figure, 1 is a keyboard lid, 2 is a keyboard device,
3 is a speaker box, 4 is a main speaker, 5 is a speaker for mid-high range, 6 is an angled back plate, and 7 is a shelf plate.

In such a structure, as shown in FIG. 2, the musical sound radiated from the main speaker 4 is reflected by the angled back plate 6 arranged below the main speaker 4, and is directed toward the listener. Will be radiated to.

The inclination angle between the main speaker 4 and the angled back plate 6 must be adjusted so that the dense portion of the reflected sound by the angled back plate 6 faces the listener.

Therefore, the listener not only hears sounds in the low range,
It is possible to directly listen to the musical tones of each component in the middle and high tones, and to listen to the musical tones with good volume balance.

Further, most of the musical sounds of the middle and high range components emitted from the main speaker 4 are reflected toward the listener by the angled back plate 6, so that the amount reflected on the floor is extremely reduced, It is possible to remarkably reduce the influence of the material and the like, that is, the change in sound quality.

FIG. 3 shows a bending process of the angled back plate 6.
It is a figure explaining an example. As shown in the figure, one back plate, for example, a cutout portion is provided at a predetermined height of one back plate having a surface covered with a decorative cloth or a vinyl sheet so that a desired mounting angle can be obtained. The angled back plate 6 is obtained by bending the cutout portion as a fulcrum.

By such bending, the angled back plate 6 can be produced with a simple structure and with a small number of steps. The method for forming the angled back plate 6 is not limited to this, and
Of course, it may be made by combining two or more plates so as to hold a certain angle.

In this case, the tilt angle between the main speaker 4 and the angled back plate 6 is determined by setting the position of the notch or the position where the plates are combined. That is,
The position of the notch or the combined position of the plates is adjusted so that the dense part of the reflected sound by the angled back plate 6 faces the listener.

FIG. 4 shows an electronic musical instrument according to the present invention.
It is a figure which shows the example which applies one plate which is not bent as the angled back plate 6. In this case, the reflection angle of the sound emitted from the main speaker 4 is adjusted by the length of the distance between the shelf plate 7 on the back surface of the electronic musical instrument and the contact point of the angled back plate 6.

According to this structure, the angled back plate 6
The process of bending the plates or the process of assembling two or more plates can be omitted in the production of, and the structure of the electronic musical instrument is very simple, and it is expected that the cost can be significantly reduced while maintaining the aesthetic appearance.

As a result, since the dense portion of the reflected sound of the musical sound in the mid-high range is directed to the listener, a rich musical sound with well-balanced bass, middle and treble can be obtained.

The angled back plate 6 used here is preferably made of a material having a small sound absorption coefficient. For example, cover the surface of the angled back plate with vinyl chloride sheet or aluminum foil,
Alternatively, it is preferable to perform a treatment such as coating the surface with paint.

By subjecting the angled back plate 6 to such a surface treatment, it is possible to prevent sound absorption, irregular reflection, etc. due to the angled back plate 6, so that better sound quality and volume can be secured.

Further, it is preferable to seal the gap between the angled back plate 6 and the shelf plate 7 with a plate or the like so that the musical sound emitted from the main speaker 4 does not escape to the back side of the electronic musical instrument.

Here, the main speaker 4 is the shelf board 7 here.
Although the case where the main speaker 4 is attached to the upper part of the shelf board 7 may be used as the main speaker 4 when the main speaker 4 is attached to the lower speaker box 3 as an example, if the main speaker 4 is attached downward, It is not limited.

The method of attaching the angled back plate 6 has been described in the present embodiment by way of example in which the light is reflected in a fixed direction. However, the method of attaching the angled back plate 6, the size, the number of sheets, etc. are as follows. It is not limited to the above, but is attached so that it is V-shaped at the bottom of the main speaker 4,
The sound may be collected at a fixed focus.

Further, since most of the sound emitted from the main speaker 4 is reflected by the angled back plate 6, the reflection in the direction of the ceiling by the floor is limited, and the influence of the floor material is small. It can provide excellent sound quality and volume.

As described above, according to the present invention, even in a low-cost electronic keyboard musical instrument in which the main speaker 4 is attached downward, the volume of the mid-high range component is heard by the listener who is located far from the instrument body. Can be provided without shortage.

The electronic musical instrument body is provided with a notch on the side surface thereof, and the angled back plate 6 is slidable up and down.
It would be even more convenient if the mounting angle could be adjusted freely.

[0049]

As described in detail above, according to the present invention, the musical sound in the mid-high range generated by the downward mounted main speaker is reflected by the angled back plate and radiated directly to the listener. Therefore, it is possible to provide the listener at a position distant from the musical instrument body with a sufficient volume of the middle and high range components.

Therefore, according to the present invention, it is possible to supply a well-balanced musical tone, and the structure of the angled back plate is simple and easy to install. The price can be reduced.

[Brief description of drawings]

FIG. 1 is a front view and a side view showing a schematic configuration of an electronic musical instrument according to the present invention.

FIG. 2 is a diagram illustrating a sound propagation state of the electronic musical instrument according to the present invention.

FIG. 3 is a diagram illustrating a bending process of the angled back plate according to the present invention.

FIG. 4 is a front view and a side view showing a schematic configuration of an electronic musical instrument according to another embodiment of the present invention.

FIG. 5 is a diagram illustrating a sound propagation state of an electronic musical instrument according to another embodiment of the present invention.

FIG. 6 is a side view showing a schematic configuration of an electronic musical instrument according to still another embodiment of the present invention and a diagram for explaining a sound propagation state.

FIG. 7 is a front view and a side view showing a schematic configuration of a conventional electronic musical instrument.

FIG. 8 is a diagram illustrating a sound propagation state of a conventional electronic musical instrument.

FIG. 9 is a front view and a side view showing a configuration of a conventional electronic musical instrument in which a main speaker is attached downward.

FIG. 10 is a diagram illustrating a sound propagation state of a conventional electronic musical instrument with a main speaker attached downward.

[Explanation of symbols]

 1 keyboard lid 2 keyboard device 3 speaker box 4 main speaker 5 speaker for mid-high range 6 back plate 7 shelf plate

Claims (4)

[Claims] 1. An electronic musical instrument having a main speaker attached downward, wherein an angled back plate is provided below the main speaker. 2. The electronic musical instrument according to claim 1, wherein the angled back plate is bent at a certain angle so that the musical sound from the main speaker is reflected toward the listener. . 3. The electronic musical instrument according to claim 1, wherein the angled back plate is inclined at a certain angle so that the musical sound from the main speaker is reflected toward the listener. 4. The electronic keyboard instrument according to claim 1, wherein the angled back plate is surface-treated.