JP2538226Y2 - Electronic musical instrument with speaker - Google Patents

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 such as a keyboard in which a speaker is accommodated in a case including an upper case and a lower case.

[0002]

2. Description of the Related Art As the above-mentioned conventional electronic keyboard instruments, those having a structure in which a speaker is directly attached to an upper case or those having a sealed case or a bass reflex speaker box attached to a lower case are known. I have.

[0003]

[Problems to be Solved by the Invention] In the case where the speaker is simply attached directly to the upper case, the sound from the back of the speaker is directed to the player from the keyboard accommodating portion of the case or the fitting portion of the upper case and the lower case. The sound leaked and interfered with the sound from the front of the speaker, and the sound quality was degraded. In addition, the one in which the speaker box is attached to the lower case has a drawback that it is not large and compact, especially in a single keyboard, and that the parts cost and the assembly cost increase. SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional drawbacks and to provide an electronic keyboard instrument having a small case, a simple structure, and improved sound quality.

[0004]

According to the present invention, in order to achieve the above object, in an electronic musical instrument in which a speaker is housed in a case comprising an upper case and a lower case, a sound emission hole is provided in the upper case. A concave portion is provided on the bottom plate of the lower case, which protrudes inward at a position facing the sound emitting hole and is opened in the rear side plate of the case, and a sound emitting hole is formed in the bottom plate of the concave portion and surrounds the sound emitting hole. A speaker body and a speaker mounting leg are integrally provided, and the speaker is housed in the cylinder body and attached to the speaker mounting leg, and a rear portion of the speaker is in close contact with an upper end of the cylinder body. And

[0005]

Since the rear part of the speaker is sealed in the cylindrical body, sound emitted from the rear part of the speaker does not leak from the fitting part of the upper case and the lower case and the keyboard housing part.
Therefore, there is no interference with the sound emitted from the sound emission hole of the upper case from the front of the speaker, and the sound quality is not impaired. The sound emitted from the rear part of the speaker is emitted to the rear of the case through the sound emitting hole formed in the bottom plate of the concave part of the lower case, without interfering with the sound heading toward the player from the front of the speaker. Further, even if the volume inside the cylinder is small, the sound emitted from the back of the speaker is emitted from the sound emission hole, so that the cone paper of the speaker can freely vibrate, and the sound quality does not deteriorate.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
In the drawings, 1 is a case of an electronic keyboard instrument, 2 is a keyboard,
3 is a speaker. Case 1 is made from the top casing 1 ₁ and the lower case 1 ₂ and having an opening 4 for exposing the keyboard 2. The upper case ₁ has a left and right in the rear two sound emission holes 5,5.
Lower case 1 ₂ at a position opposed to said sound output hole 5,5 rear left and right of the bottom plate 6, recesses 7 and 7 open to projecting and rearwardly plate inward are formed. A sound emission hole 9 is formed in a bottom plate 8 of the recess 7, and a circular cylindrical body 10 and four speaker mounting legs 11 near the outer periphery thereof are integrally formed with the bottom plate 8 on the upper portion of the bottom plate 8. Is formed. The speaker 3 is fitted into the cylindrical body 10, placed on the upper edge thereof through a sealing member 12 such as a felt if necessary, and attached to the speaker mounting leg 11 by a screw 13 at the peripheral edge. Thus, the rear part of the speaker 3 is sealed in the cylindrical body 10, and the sound emitted from the rear part is
The sound is not leaked into the case 1 but is emitted from the sound emission hole 9 to the rear of the case 1 through the concave portion 7. Sound outlet 9 of the lower case 1 ₂ speaker 3 by setting the area to the optimum value
The optimum damper effect can be given to the characteristics of the above.

[0007]

According to the present invention, as described above, the rear part of the speaker attached to the speaker mounting leg of the lower case is housed in the cylinder of the lower case and closely adheres to the upper edge of the cylinder.
Since the sound emitted from the back of the speaker is emitted from the sound emission hole of the lower case to the rear of the case through the recess, the sound quality of the speaker is not degraded, and the speaker mounting leg and the cylinder are used. Since the body is formed integrally with the lower case, the number of parts is small, the structure is simple, the assembling is easy, and the case is reduced in size.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention as viewed from the back.

FIG. 2 is a sectional view of the embodiment shown in FIG. 1;

3 is a perspective view of a lower case of the embodiment shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Case of electronic keyboard instrument 1 ₁ Upper case 1 ₂ Lower case 2 Keyboard 3 Speaker 4 Opening 5 Sound emission hole 6 Bottom plate 7 Depression 8 Bottom plate of depression 7 9 Sound emission hole 10 Cylindrical body 11 Speaker mounting leg 12 Sealing member 13 Screw

Claims (1)

(57) [Scope of request for utility model registration] 1. An electronic musical instrument in which a speaker is housed in a case composed of an upper case and a lower case, wherein a sound emission hole is provided in the upper case, and an inner side is provided at a position of the bottom plate of the lower case facing the sound emission hole. A recess that projects into the rear side plate of the case, forms a sound emission hole in the bottom plate of the recess, and integrally provides a cylinder surrounding the sound emission hole and a speaker mounting leg. An electronic musical instrument having a speaker, wherein the electronic musical instrument is housed in the cylindrical body and attached to the speaker mounting leg, and a back surface of the speaker is in close contact with an upper end of the cylindrical body.