JP3055368B2 - Electronic musical instrument housing - 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 an electronic piano.

[0002]

2. Description of the Related Art Conventionally, a housing of an electronic musical instrument having a speaker box in a housing body made of a synthetic resin is known. In such a housing, a reinforcing rib is integrally provided at a predetermined position on the inner surface of the upper surface wall of the housing main body to prevent bending thereof. Usually, the thickness of the rib is set to be thinner (about half) than the thickness (2.5 mm to 5 mm) of the upper surface wall of the housing body.

[0003] If the thickness of the rib is set to be larger than the thickness of the upper surface wall of the housing body, the molding material (synthetic resin) in the mold at the time of molding the housing body cools and solidifies. At this time, the upper wall of the housing body, which is a thin portion, is solidified before the rib, which is a thick portion, so that the molding material of the thick portion is applied to the thin portion. When pulled, a depression is formed in the thick portion, and as a result, a "mark mark" is formed on the upper surface wall surface of the housing body, which impairs the appearance.

[0004] The housing of this type of conventional electronic musical instrument is
A speaker box is provided in a housing body in which an upper housing and a lower housing are mounted to face each other. Therefore, a speaker box forming rib is provided on the lower housing separately from the reinforcing rib. Projections are provided integrally with the surface facing the housing or the surfaces facing each other of the upper housing and the lower housing. Due to the acoustic characteristics, it is necessary to set the thickness of such a rib for the speaker box to a certain thickness. Therefore, when the housing body is formed of a synthetic resin, the above-described problem of the “mark mark” is caused. Is inevitable.

In general, in order to obtain acoustic characteristics extending from a low frequency range to a high frequency range, it is said that the speaker box should have a closed structure and a large wall thickness. As a specific means for forming the speaker box into a closed structure, a rib for forming a speaker box is integrally provided on the upper surface of the bottom wall of the lower housing, and the rib (or the rib and the wall portion of the lower housing) are provided. By closing the upper surface of the enclosed space with the closing plate, a closed speaker box is formed in the housing body.

Further, as another specific means for making the speaker box a closed structure, as shown in FIG. 6, a housing body in which an upper housing 1 and a lower housing 2 are mounted opposite to each other. 3, ribs 4 and 5 for forming a speaker box are integrally provided on the opposing surfaces of the upper housing 1 and the lower housing 2, respectively.
By making the protruding ends of the ribs 4 and 5 abut against each other, a closed speaker box 6 is provided in the housing body 3.
It constitutes.

[0007]

Of the above-mentioned conventional housings, the reinforcing ribs and the speaker box forming ribs projecting from the housing main body, respectively, make the structure complicated.

Further, as described above, the thickness of the ribs for constituting the speaker box needs to be increased in terms of acoustic characteristics. Therefore, if the housing body is formed of a synthetic resin, the problem of the “mark mark” occurs as described above. Occurs. Therefore, in the apparatus shown in FIG. 6, the upper surface of the housing body 3 is covered by a panel (operation panel) 7 so that the "mark" is not seen, so that the appearance (appearance) is improved. Therefore, the panel 7 is required, and the configuration is also complicated.

Further, a rib for forming a speaker box is integrally formed on the upper surface of the bottom wall of the lower housing, and the upper surface of a space surrounded by the rib (or the rib and the wall of the lower housing). When a closed speaker box is formed in the housing body by closing the box with a closing plate, a closing plate is required, which also complicates the configuration.

Further, since the upper housing and the lower housing are mounted opposite to each other to constitute the housing main body, it is difficult to structurally and firmly mount the upper housing and the lower housing. As it is, the sound from the speaker or the vibration when a key on the keyboard is played causes "chatter" at the joint between the upper housing and the lower housing. For this reason, it is necessary to attach an anti-vibration material such as an anti-vibration tape to the joint, and the operation for that purpose is complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a first object of the present invention is to use a reinforcing rib and a speaker box forming rib together to simplify the structure and to separate a panel or the like. An object of the present invention is to provide a housing which eliminates a problem in appearance due to a “mark mark” without specially providing parts.

A second object of the present invention is to provide a structure in which the upper housing and the lower housing can be firmly mounted with a simple configuration, and the upper housing can be mounted without mounting a vibration isolator. It is an object of the present invention to provide a housing in which "chattering" does not occur at a joint portion between the speaker box and the lower housing, and the hermeticity of the speaker box can be secured with a simple configuration.

[0013]

According to a first aspect of the present invention, there is provided an electronic musical instrument having a speaker box provided in a housing body made of a synthetic resin. In the housing of the musical instrument, a reinforcing rib is integrally provided at a predetermined position on the inner surface of the upper surface wall of the housing main body,
In a portion of the upper surface wall of the housing body facing the rib ,
A groove is provided, and the rib serves as a wall constituting the speaker box and is set to a thickness that does not impair the acoustic characteristics of the speaker box.

According to a second aspect of the present invention, there is provided a housing for an electronic musical instrument, wherein an upper housing and a lower housing are mounted opposite to each other. In a housing of an electronic musical instrument comprising a closed speaker box, reinforcing ribs are projected from opposing surfaces of the upper housing and the lower housing, respectively, and the upper housing and the lower housing are provided. When the body is configured to face each other, at least one of the projecting end of the rib of the upper case and the projecting end of the rib of the lower case is attached to both cases. co when configured so as to resiliently pressed against the inclined with <br/> other with respect to the direction
Further, the speaker box is constituted by the rib of the upper housing, the rib of the lower housing, the wall of the upper housing, and the wall of the lower housing.

[0015]

[0016]

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS. This embodiment is applied to a housing of an electronic piano, FIG. 1 is a plan view of a housing according to a first embodiment of the present invention, FIG.
FIG. 3 is a sectional view taken along line BB of FIG. In each figure,
Reference numeral 10 denotes a horizontally long casing, which has a casing main body 11 made of synthetic resin. The housing body 11 includes an upper housing 12 and a lower housing 13.
Are opposed to each other. That is, the housing body 11 is configured by fitting and fixing the peripheral side wall 12a of the upper housing 12 and the peripheral side wall 13a of the lower housing 13 to each other. The upper surface 12b of the upper housing 12 is an inclined surface that becomes gradually lower from the rear end side (the right end side in FIG. 3) to the front end side (the left end side in FIG. 3).

A large number of keys (white keys and black keys) 14 are arranged side by side in the left-right direction (longitudinal direction) on the front side (left side in FIG. 3) of a substantially middle part in the front-rear direction (width direction) of the housing body 11. Have been.
Further, speaker boxes 15 having a closed structure are provided at both ends in the left-right direction (longitudinal direction) on the rear end side (right end side in FIG. 3) from the substantially middle part in the front-rear direction of the housing main body 11, respectively. The speakers 16 located in the speaker boxes 15 are fixed to the inner surfaces of both ends in the left-right direction of the upper housing 12, respectively. Slits 17 are respectively formed in portions of the upper housing 12 where the speakers 16 are fixed (the portions corresponding to the upper surface of the speaker box 15).
Is emitted to the outside of the housing main body 11 through the corresponding slit 17.

The two speaker boxes 15 of the housing body 11
The portion located between the two is an electronic component storage room 18. A number of switches 19, a display unit 20, and the like are provided in a portion of the upper housing 12 located above the electronic component storage room 18.

At the substantially middle part in the front-rear direction (width direction) and both end parts in the left-right direction (longitudinal direction) of the upper surface (front surface) of the casing body 11, a narrow width (on design) for adjusting appearance is provided. Grooves 21 and 22 are formed. The groove 21 at a substantially middle portion in the front-rear direction extends over substantially the entire longitudinal direction of the housing body 11. The grooves 22 at both ends in the left-right direction are along the outer peripheral edge of the speaker box 15.

The groove 2 on the inner surface of the upper wall 12b of the upper housing 12
A rib 23 is integrally protruded from a portion facing the portions 1 and 2. The rib 23 faces in a direction orthogonal to the upper wall 12b of the upper housing 12. The ribs 23 are reinforcing ribs for preventing the upper housing 12 from bending, and ribs for forming the speaker box 15 (walls).
Part) .

Further, a rib 24 corresponding to the rib 23 of the upper housing 12 is integrally provided on the bottom wall 13b of the lower housing 13 so as to protrude therefrom. The rib 24 faces in a direction perpendicular to the horizontal bottom wall 13b of the lower housing 13. The rib 24 also serves as a reinforcing rib for preventing the lower housing 13 from bending and a speaker box forming rib for forming the speaker box 15.

When the upper housing 12 and the lower housing 13 are mounted to face each other, the protruding end 23a of the rib 23 of the upper housing 12 is positioned opposite to the protruding end 24a of the rib 24 of the lower housing 13. Elastically pressed obliquely. Both ribs 23, 24
The wall of the upper case 12 and the wall of the lower case 13 constitute a speaker box 15 having a sealed structure.

In the present embodiment, the upper housing 12 and the lower housing 13 are structurally and firmly fixed to each other by the elastic pressing of the protruding ends 23a and 24a of the ribs 23 and 24. Is done. Therefore, the sound from the speaker 16 and the vibration when the key 14 is played are caused by the upper housing 12 and the lower housing 13.
No "chatter" occurs at the joint with the upper housing 12
Even if there is some error in the joint between the lower housing 13 and the lower housing 13, the error can be absorbed.

The protruding ends 23a, 24a of the ribs 23, 24 constituting the speaker box 15 are elastically pressed against each other, so that the upper housing 12 and the lower housing 13 can be removed from each mold. Regardless of the direction, the hermeticity of the speaker box 15 is reliably maintained, and predetermined acoustic characteristics can be secured.

Further, by making the thickness of the ribs 23 of the upper housing 12 larger than the thickness of the upper wall 12b of the upper housing 12,
Although a “mark mark” is formed on the upper wall 12 b of the upper housing 12, the “mark mark” is formed by a groove provided on the outer surface of the upper wall 12 b of the upper housing 12 facing the rib 23.
Is not noticeable, and does not spoil the appearance (look).

Further, the more the "sink" occurs, the more the "sink" draws the bottom of the groove inward, so that the appearance accent is further emphasized, which is more convenient.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the same parts as those in the first embodiment will be described with the same reference numerals attached to the drawings. In the present embodiment, the protruding length of the rib 23 of the upper housing 12 and the rib 24 of the lower housing 13 is set longer than in the first embodiment. Then, the ribs 23 of the upper housing 12 are obliquely opposed to the ribs 24 of the lower housing 13 with a space therebetween, and the protruding end 23 a of the rib 23 of the upper housing 12 and the bottom wall of the lower housing 13. 13b and the rib 24 of the lower housing 13
Are provided between the protruding end portion 24a and the upper surface wall 12b of the upper housing 12, respectively.

In this embodiment constructed as described above,
A port portion 25 is formed between the ribs 23 and 24 so as to gradually decrease in width from the lower side to the upper side.
A part of the sound of each speaker 16 comes out of the housing body 11 via the corresponding port 25. By providing the port portion 25 in this manner, it is possible to obtain acoustic characteristics in which the bass range extends as compared with the case where the speaker box 15 has a closed structure as in the first embodiment.

The other constructions and operations of this embodiment are the same as those of the first embodiment, and therefore, the same reference numerals are given to the drawings and the detailed description thereof will be omitted.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the same parts as those in the first embodiment will be described with the same reference numerals attached to the drawings. In this embodiment, the ribs 23 of the upper housing 12 are used.
Similarly to the ribs 24 of the lower housing 13, projecting in a direction perpendicular to the horizontal plane, and projecting end portions 23 a, 24 a of both ribs 23, 24 are provided with inclined surfaces 23 b, 24 b, respectively. The inclined surfaces 23b and 24b are elastically pressed against each other.

Also in this embodiment, the inclined surfaces 23b, 24b of the protruding ends 23a, 24a of the ribs 23, 24 are
By setting about 0.3mm larger than the outer peripheral surface,
The error including the dimensional error in the vertical direction can be released in the horizontal direction, and the inclined surfaces 23b and 24b can be elastically and firmly pressed against each other. As a result, the sealed state of the speaker box 15 is reliably maintained as in the first embodiment, and predetermined acoustic characteristics can be ensured.

The other constructions and operations of the present embodiment are the same as those of the first embodiment, and therefore, the same reference numerals are given to the drawings and the detailed description thereof will be omitted.

[0035]

As described above in detail, according to the housing of the electronic musical instrument according to the first invention (claim 1) of the present invention, the rib integrally projecting from the inner wall of the upper surface of the housing main body has the following features. Since the reinforcing rib for preventing the bending of the housing body and the rib for constituting the speaker box are also used, it is not necessary to provide these individually, and the configuration is simplified. Further, since the groove provided on the outer surface of the upper wall of the housing body is opposed to the rib, the "mark mark" becomes inconspicuous by this groove, and the appearance is improved.

Further, according to the housing of the electronic musical instrument according to the second invention (claim 2) of the present invention, when the upper housing and the lower housing are mounted opposite to each other to constitute the housing main body. At least one of the protruding end of the rib of the upper housing and the protruding end of the rib of the lower housing is obliquely elastically pressed against the other, and the rib of the upper housing and the lower housing are Since the speaker box is constituted by the ribs of the body, the wall of the upper housing, and the wall of the lower housing, the upper housing and the lower housing are structurally and firmly mounted with a simple configuration. It can be "chattered" at the joint between the upper and lower housings without attaching vibration insulators.
Does not occur, and the hermeticity of the speaker box can be ensured by a simple configuration.

[Brief description of the drawings]

FIG. 1 is a plan view of a housing of an electronic musical instrument according to a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view of a housing of an electronic musical instrument according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a housing of an electronic musical instrument according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a housing of a conventional electronic musical instrument.

[Explanation of symbols]

 Reference Signs List 10 housing 11 housing main body 12 upper housing 12b upper housing upper wall 13 lower housing 15 speaker box 22 groove 23 rib 23a rib protruding end 24 rib 24a rib protruding end

Claims (2)

(57) [Claims] 1. A housing for an electronic musical instrument having a speaker box provided in a housing body made of a synthetic resin, wherein a reinforcing rib is integrally provided at a predetermined position on an inner surface of an upper wall of the housing body.
A groove provided on a portion of the outer surface of the upper surface wall of the housing body facing the rib, the rib being a wall constituting the speaker box; An electronic musical instrument housing characterized in that the thickness is set so as not to impair the acoustic characteristics of the box. 2. A housing for an electronic musical instrument comprising a sealed speaker box in a housing main body in which an upper housing and a lower housing are mounted opposite to each other, wherein the upper housing and the lower housing are provided. Reinforcement ribs protrude from each other's opposing surfaces,
When the upper housing and the lower housing are attached to each other to form the housing main body, at least one of the protruding end of the rib of the upper housing and the protruding end of the rib of the lower housing. One is both housings
Resiliently well as configured to be able to press, the lower casing and the ribs of the rib and the lower housing of the upper housing and the upper housing wall part with respect to the other inclined with respect to the mounting direction of the A housing for an electronic musical instrument, wherein the speaker box is constituted by a body wall.