JPH0728466A - Casing of electronic musical instrument - Google Patents

Abstract

PURPOSE:To enhance mechanical strength and to simplify constitution by forming a rib for reinforcement and a rib for constituting a speaker box in such a manner that these ribs are commonly used. CONSTITUTION:The part of an upper wall surface 12b of an upper casing 12 is integrally projectingly provided with the rib 23 in a part corresponding to a groove 22 on the inside surface thereof. This rib 23 faces the direction orthogonal with the upper wall surface 12b of the upper casing 12. The rib 23 is commonly used as the rib for reinforcement to prevent the deflection of the upper casing 12 and the rib for the speaker box 15. The bottom surface 13b of the lower casing 13 is integrally projectingly provided with the rib 24 corresponding to the rib 23 of the upper casing 12. The rib 24 faces the direction orthogonal with the horizontal base wall 13b of the lower casing 13. The rib 24 is commonly used as the rib for reinforcement to prevent the deflection of the lower casing 13 and the rib for the speaker box 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case of 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 synthetic resin is known. In such a casing, a reinforcing rib is integrally provided at a predetermined position on the inner surface of the upper surface of the casing main body so as to prevent the bending thereof. The thickness of the rib is usually set to be thinner (about half) than the thickness (2.5 mm to 5 mm) of the upper wall of the housing body.

The reason is that when the thickness of the rib is set to be larger than the thickness of the upper surface wall of the casing body, the molding material (synthetic resin) in the mold during molding of the casing body is cooled and solidified. At this time, since the upper surface wall of the housing body, which is a thin portion, is solidified before the rib, which is a thick portion, the molding material of the thick portion becomes a thin portion. This is because when it is pulled, a dent is formed in the thick portion, and as a result, a “sink mark” is formed on the surface of the upper surface wall of the housing body, which impairs the appearance.

The conventional electronic musical instrument housing of this type is
A speaker box is provided in a housing body configured by mounting an upper housing and a lower housing so as to face each other. Therefore, the speaker box forming rib is provided on the lower housing separately from the reinforcing rib. It is integrally provided on the surface facing the housing or on the surface facing the upper housing and the lower housing. Due to the acoustic characteristics, such a rib for speaker box configuration needs to be made thicker to some extent. Therefore, when molding the housing body with synthetic resin, the problem of the above-mentioned "sink mark" occurs. Occurrence of is inevitable.

In general, in order to obtain the acoustic characteristics extending from the low tone range to the high tone range, it is preferable that the speaker box has a closed structure and a large wall thickness. As a concrete means for making the speaker box into a closed structure, a speaker box constituting rib is integrally provided on the upper surface of the bottom wall of the lower housing, and this rib (or this rib and the wall portion of the lower housing are provided. By closing the upper surface of the enclosed space with a closing plate, a closed speaker box is formed in the housing body.

Further, as another concrete means for making the speaker box into a hermetically sealed structure, as shown in FIG. 6, a casing body constituted by mounting an upper casing 1 and a lower casing 2 opposite to each other. Speaker ribs 4 and 5 for constructing the speaker box are integrally formed on the surfaces of the upper housing 1 and the lower housing 2 which face each other, respectively.
By bringing the protruding ends of these ribs 4 and 5 into contact with each other, the sealed speaker box 6 is provided in the housing body 3.
It is what constitutes.

[0007]

Among the above-mentioned conventional casings, the one in which the reinforcing ribs and the speaker box constituting ribs are provided on the casing main body in a protruding manner has a complicated structure.

Further, as described above, the thickness of the rib for speaker box construction needs to be thick in terms of acoustic characteristics. Therefore, when the housing body is molded with synthetic resin, the problem of "sink mark" occurs as described above. Occurs. Therefore, in the structure shown in FIG. 6, the upper surface of the housing body 3 is covered with a panel (operation panel) 7 so that the “sink mark” cannot be seen, thereby improving the appearance (look). Therefore, the panel 7 is required, which also has a complicated structure.

Further, a speaker box constituting rib is integrally provided on the upper surface of the bottom wall of the lower housing, and the upper surface of the space surrounded by the rib (or by the rib and the wall of the lower housing). In the case where the closed type speaker box is configured in the housing body by closing the closing plate with the closing plate, the closing plate is required, and this also complicates the configuration.

Further, since the upper housing and the lower housing are mounted so as to face each other to form the housing 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 the keys of the keyboard are played causes "chattering" at the joint between the upper casing and the lower casing. Therefore, it is necessary to attach a vibration-proof material such as a vibration-proof tape to the joint portion, and the operation for that purpose is complicated.

The present invention has been made in view of the above circumstances. A first object of the present invention is to use the reinforcing ribs and the speaker box forming ribs together to simplify the structure and to separate the panel and the like. An object of the present invention is to provide a housing that solves the problem of appearance due to the “sink mark” without providing special parts.

A second object of the present invention is that the upper casing and the lower casing can be structurally and firmly mounted by a simple structure, and the upper casing can be mounted without mounting a vibration isolator. It is an object of the present invention to provide a case in which “chapping” does not occur at the joint between the lower case and the lower case and the airtightness of the speaker box can be ensured with a simple configuration.

[0013]

In order to achieve the above-mentioned first object, a first invention of the present invention relates to a housing of an electronic musical instrument comprising a speaker box inside a housing body made of synthetic resin, A groove for adjusting the appearance is provided at a predetermined position on the outer surface of the upper surface of the housing body, and a reinforcing rib is integrally projected on a portion of the inner surface of the upper surface of the housing body facing the groove. The rib is a wall portion that constitutes the speaker box, and is set to a thickness that does not impair the acoustic characteristics of the speaker box.

In order to achieve the above-mentioned second object, a second invention of the present invention is to provide a hermetically-sealed speaker box in a housing body constituted by mounting an upper housing and a lower housing facing each other. In a housing of an electronic musical instrument provided with, reinforcing ribs are provided in a projecting manner on mutually opposing surfaces of the upper housing and the lower housing, and the upper housing and the lower housing are mounted so as to face each other. At least one of the protruding ends of the ribs of the upper housing and the protruding ends of the ribs of the lower housing is elastically pressed obliquely against the other when the housing body is configured by The speaker box is configured by the ribs of the upper casing, the ribs of the lower casing, the wall portion of the upper casing, and the wall portion of the lower casing.

[0015]

In the case of the first aspect of the invention, the rib integrally provided on the inner surface of the upper surface of the case body has a reinforcing rib for preventing the case body from bending and a rib for forming the speaker box. Since they are also used, it is not necessary to provide them individually, and the configuration is simplified. Further, since the groove provided on the outer surface of the upper surface is opposed to the rib, the "sink mark" is not conspicuous due to the groove, and the appearance is good.

Further, in the case of the second invention, when the case body is constructed by mounting the upper case and the lower case to face each other,
At least one of the protruding ends of the ribs of the upper housing and the protruding ends of the ribs of the lower housing is elastically pressed obliquely against the other, so that the ribs of the upper housing and the lower housing The ribs, the wall of the upper housing, and the wall of the lower housing form the speaker box. This allows the upper and lower housings to be structurally and firmly mounted with a simple configuration, and "vibration chattering" can be made at the joint between the upper and lower housings without mounting a vibration damping material. Is not caused, and the airtightness of the speaker box can be secured by a simple configuration.

[0017]

Embodiments 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 the first embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a sectional view taken along the line BB of FIG. In each figure,
Reference numeral 10 denotes a horizontally long housing, which has a housing body 11 made of synthetic resin. The housing body 11 includes an upper housing 12 and a lower housing 13.
And are installed opposite to each other. That is, the case body 11 is configured by fitting and fixing the peripheral side wall 12a of the upper case 12 and the peripheral side wall 13a of the lower case 13 to each other. The upper surface 12b of the upper housing 12 is an inclined surface that gradually lowers from the rear end side (right end side in FIG. 3) toward the front end side (left end side in FIG. 3).

A large number of keys (white keys and black keys) 14 are juxtaposed in the left-right direction (longitudinal direction) on the front side (left side in FIG. 3) of the housing main body 11 in the front-rear direction (width direction). Has been done.
Further, speaker boxes 15 having a hermetically sealed structure are provided at both ends in the left-right direction (longitudinal direction) on the rear end side (the right end side in FIG. 3) of the housing main body 11 in the approximately front-rear direction. Speakers 16 located in these speaker boxes 15 are fixed to the inner surfaces of both ends of the upper housing 12 in the left-right direction. Slits 17 are formed in the part of the upper housing 12 where both the speakers 16 are fixed (the part corresponding to the upper surface of the speaker box 15).
Sound is emitted to the outside of the housing body 11 through the corresponding slit 17.

Both speaker boxes 15 of the housing body 11
The parts located between each other form an electronic component storage chamber 18. A large number of switches 19 and a display unit 20 are provided in a portion of the upper housing 12 located above the electronic component storage chamber 18.

On the upper surface (front surface) of the housing main body 11, a narrow width (designed) for adjusting the appearance is provided at approximately the middle portion in the front-back direction (width direction) and both ends in the left-right direction (longitudinal direction). Grooves 21 and 22 are formed. The groove 21 at the substantially middle portion in the front-rear direction extends over substantially the entire longitudinal direction of the housing body 11. Further, 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 top wall 12b of the upper housing 12
A rib 23 is integrally formed at a portion facing the first and second members 22. The rib 23 is provided on the upper surface wall 12 b of the upper housing 12.
It faces in the direction orthogonal to. The rib 23 is provided on the upper housing 12.
The reinforcing ribs for preventing the bending of the speaker box and the ribs for configuring the speaker box 15 for configuring the speaker box 15 are also used.

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 project. The rib 24 faces in a direction orthogonal to the horizontal bottom wall 13b of the lower housing 13. The rib 24 also serves as a reinforcing rib for preventing the lower casing 13 from bending and a speaker box constituting rib for constituting the speaker box 15.

In a state where the upper casing 12 and the lower casing 13 are mounted opposite to each other, the protruding end portions 23a of the ribs 23 of the upper casing 12 are different from the protruding end portions 24a of the ribs 24 of the lower casing 13. And diagonally elastically pressed. Both ribs 23, 24
The wall portion of the upper housing 12 and the wall portion of the lower housing 13 form a speaker box 15 having a sealed structure.

In this embodiment, the protruding ends 23a, 24a of the ribs 23, 24 are elastically pressed against each other, so that the upper casing 12 and the lower casing 13 are structurally and firmly fixed to each other. To be done. Therefore, due to the sound from the speaker 16 and the vibration when the key 14 is played, the upper housing 12 and the lower housing 13 are
No chattering 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.

Further, since the projecting end portions 23a, 24a of the ribs 23, 24 constituting the speaker box 15 are elastically pressed against each other, the upper casing 12 and the lower casing 13 can be molded and removed from each mold. Regardless of the direction, the airtightness of the speaker box 15 is reliably maintained, and a predetermined acoustic characteristic can be secured.

Further, by making the thickness of the ribs 23 of the upper housing 12 thicker than the thickness of the upper surface wall 12b of the upper housing 12,
Although the "sink mark" is generated on the upper surface wall 12b of the upper housing 12, the "sink mark" is formed by the groove provided on the outer surface of the upper surface wall 12b of the upper housing 12 so as to face the rib 23.
Does not stand out and the appearance (look) is not impaired.

Further, the more the “skeins” are generated, the more the “skeins” draw the bottom of the groove inward, which is more convenient because the appearance accent is further emphasized.

(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 described above will be described with the same reference numerals in the drawings. In this embodiment, the protruding lengths of the ribs 23 of the upper housing 12 and the ribs 24 of the lower housing 13 are set longer than in the first embodiment. Then, the ribs 23 of the upper housing 12 are diagonally opposed to the ribs 24 of the lower housing 13 with a space therebetween, and the protruding end portions 23 a of the ribs 23 of the upper housing 12 and the bottom wall of the lower housing 13 are arranged. 13b and the rib 24 of the lower housing 13
A gap is provided between each of the projecting end portions 24a and the upper surface wall 12b of the upper housing 12.

In the present embodiment thus constructed,
A port portion 25 is formed between the two ribs 23, 24, the width of which gradually decreases from the lower side to the upper side.
Part of the sound of each speaker 16 is output to the outside of the housing body 11 via the corresponding port portion 25. By providing the port portion 25 in this way, it is possible to obtain acoustic characteristics that extend the low frequency range, as compared with the case where the speaker box 15 has a closed structure as in the first embodiment.

Since the other construction and operation of this embodiment are the same as those of the first embodiment, the same reference numerals are attached to the drawings and their detailed description 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 described above will be described with the same reference numerals in the drawings. In this embodiment, the rib 23 of the upper housing 12 is used.
Like the ribs 24 of the lower housing 13, the ribs are provided so as to project in a direction orthogonal to the horizontal plane, and the protruding ends 23a and 24a of the ribs 23 and 24 are provided with inclined surfaces 23b and 24b, respectively. The inclined surfaces 23b and 24b are elastically pressed against each other.

Also in this embodiment, the inclined surfaces 23b and 24b of the projecting end portions 23a and 24a of the ribs 23 and 24 are
By setting about 0.3 mm larger than the outer peripheral surface,
It is possible to escape the error including the dimensional error in the vertical direction in the horizontal direction, and moreover, these inclined surfaces 23b and 24b can be elastically and firmly pressed against each other. As a result, similarly to the first embodiment, the hermetically sealed state of the speaker box 15 can be reliably maintained, and a predetermined acoustic characteristic can be secured.

Since the other structure and operation of this embodiment are the same as those of the first embodiment, the same reference numerals are given to the drawings and the detailed description thereof will be omitted.

[0035]

As described in detail above, according to the housing of the electronic musical instrument of the first aspect of the present invention (claim 1), the rib integrally formed on the inner surface of the upper surface of the housing body is Since the reinforcing ribs for preventing the bending of the housing body also serve as the ribs for forming the speaker box, it is not necessary to provide them individually, and the structure is simplified. Further, since the groove provided on the outer surface of the upper surface of the housing body is opposed to the rib, the "sinker mark" is not conspicuous by the groove, and the appearance is good.

According to the housing of the electronic musical instrument of the second aspect of the present invention (claim 2), when the housing body is constructed by mounting the upper housing and the lower housing facing each other. At least one of the protruding ends of the ribs of the upper housing and the protruding ends of the ribs of the lower housing is elastically pressed obliquely against the other, and the ribs of the upper housing and the lower housing are Since the speaker box is configured by the ribs of the body, the wall portion of the upper housing, and the wall portion of the lower housing, the upper housing and the lower housing are structurally and firmly attached by a simple configuration. It is possible to "challenge" at the joint between the upper and lower housings without attaching vibration damping material.
And the speaker box can be hermetically sealed with a simple structure.

[Brief description of 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 on arrow A in FIG.

3 is a cross-sectional view taken along the line BB of FIG.

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 reference numerals] 10 case 11 case body 12 upper case 12b upper case wall 13 lower case 15 speaker box 22 groove 23 rib 23a rib protruding end 24 rib 24a rib protruding end

Claims (2)

[Claims] 1. In a housing of an electronic musical instrument having a speaker box in a housing body made of synthetic resin, a groove for adjusting appearance is provided at a predetermined position on an outer surface of an upper wall of the housing body. At the same time, a reinforcing rib is integrally provided so as to project from a portion of the inner surface of the upper surface of the housing body that faces the groove, and the rib is a wall portion that configures the speaker box. A housing of an electronic musical instrument characterized by being set to a thickness that does not impair the acoustic characteristics of the speaker box. 2. A housing of an electronic musical instrument, comprising a sealed speaker box in a housing body constituted by mounting an upper housing and a lower housing opposite to each other, wherein the upper housing and the lower housing. Reinforcing ribs are provided on the mutually opposing surfaces of
When the upper housing and the lower housing are mounted opposite to each other to form the housing body, at least one of the protruding ends of the ribs of the upper housing and the protruding ends of the ribs of the lower housing is One is elastically pressed obliquely against the other, and the speaker box is formed by the ribs of the upper housing, the ribs of the lower housing, the wall portion of the upper housing, and the wall portion of the lower housing. A housing of an electronic musical instrument characterized by being configured.