JP2006195263A - Electronic keyboard musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a sound from leaking from the acoustic space of an electronic keyboard musical instrument which has the acoustic space constituted by utilizing a housing. <P>SOLUTION: In the housing 10, the acoustic space 10a is formed by inserting both end parts 13a and 13b of a partition plate 13 into a couple of guide grooves 11d and 11e of a primary housing body 11, respectively, and a couple of opening parts 10b and 10b formed at both left and right ends of the primary housing body 11 at this time are closed with a couple of side covers 16. Consequently, a gap is less likely to be formed at the jointing part between the primary housing body 11 and partition plate 13 to prevent a sound from leaking from the acoustic space 10a. Consequently, sound quality which is superior from a lower range of voices to the upper range of voices, damped properly, and proper in response can be obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for preventing deterioration in sound quality due to sound leakage from an acoustic space in an electronic keyboard instrument in which an acoustic space is configured using a casing.

Conventionally, electronic keyboard instruments such as an electronic piano and an electronic organ in which an acoustic space is configured using a casing are known.
In such an electronic keyboard instrument, a casing is constituted by an upper casing and a lower casing made of synthetic resin, and a rib is provided inside the casing at least one of the upper casing and the lower casing. Some of them have an acoustic space that is hermetically isolated by forming the upper housing and the lower housing together by combining the upper housing and the lower housing (see, for example, Patent Document 1).

By providing an acoustic space that is hermetically isolated in this way, there are the following advantages compared to the case of simply providing an acoustic space surrounded by a wall surface.
(1) Good bass performance (2) Good sound interruption and sound response
JP-A-2-158800 (page 4, FIG. 1)

  However, in the electronic keyboard instrument as described above, when the upper casing and the lower casing are put together for the following reason, a gap is easily formed between the joint surfaces, and sound leaks from the gap, so that the sound quality is reduced. There was a problem that decreased. That is, in general, in order to obtain good acoustic characteristics from a low sound range to a high sound range, it is preferable that the speaker box has a sealed structure and has a large wall thickness. Therefore, if the thickness of the rib is set larger than the thickness of the wall portion of the upper casing or the lower casing, the molding material (synthetic resin) in the mold at the time of molding the upper casing or the lower casing When cooling and solidifying, the wall parts of the upper and lower casings, which are thin parts, are solidified before the ribs, which are thick parts. This is because distortion is easily caused by being pulled by a thin portion.

  It is also possible to fill the gap by attaching a vibration-proofing material such as vibration-proof tape to the gap generated on the joint surface of the upper and lower cases constituting the case. In this case, there is a problem that the number of manufacturing steps and the manufacturing cost of the casing increase accordingly.

  The present invention has been made in view of such a problem, and an object of the present invention is to prevent sound leakage from the acoustic space in an electronic keyboard instrument in which the acoustic space is configured using a casing. Is to provide.

  The electronic keyboard musical instrument according to claim 1, which has been made to solve the above-mentioned problems, is as follows: “A partition plate is inserted into a pair of guide grooves formed in a casing using extruded material, and openings at both ends of the casing are covered. It is characterized in that an acoustic space is formed by closing with a portion.

  Specifically, the electronic keyboard instrument described above (1: In this column, in order to facilitate understanding of the invention, the reference numerals used in the “Best Mode for Carrying Out the Invention” column are attached as necessary. , Does not mean that the scope of claims is limited by this symbol.) Includes a housing (10), and an acoustic space is configured using the housing. The housing includes a housing body (11), a plate-like partition plate (13), and a pair of side lids (16, 16). The casing body is configured by using an extruded material having a cross section with a part thereof opened, and has an opening and a pair of guide grooves (11d, 11e) formed along the extrusion direction of the extruded material. . The partition plate can block the opening by inserting both ends of the partition plate into a pair of guide grooves of the housing body. Further, the side lid can block the pair of openings (10b) formed at both ends of the casing body in the pushing direction when both ends of the partition plate are respectively inserted into the pair of guide grooves of the casing body. Is possible. And about a housing | casing, while inserting both ends of a partition plate into a pair of guide groove of a housing main body, respectively, a pair of opening part formed in each of the both ends of the extrusion direction in a housing main body at that time An acoustic space (10a) is formed in the interior by being closed with a lid.

  In the conventional electronic keyboard instrument, there is a problem that when the upper casing and the lower casing are combined, a gap is easily formed between these joint surfaces, and sound is deteriorated because sound leaks from the gap. On the other hand, according to the present invention, an acoustic space is formed by inserting a partition plate into a pair of guide grooves formed in a casing using an extruded material, and closing openings at both ends of the casing with lids. Therefore, it is difficult for a gap to occur at the joint between the housing body and the partition plate, and sound leakage from the acoustic space can be prevented. This also makes it possible to obtain a good sound quality from a low sound range to a high sound range and a sound quality with good response (response) with braking.

  Further, according to the present invention, since the guide groove for inserting the partition plate is formed as part of the above-mentioned extruded material at the time of extrusion molding, the upper casing constituting the casing like a conventional electronic keyboard instrument There is no need to install anti-vibration tape or other anti-vibration material in the gap formed on the joint surface that combines the lower case and fill the gap, and the extra man-hours and cost of manufacturing the extra case Will not increase. Further, for example, the guide groove can be easily formed as compared with the case where the guide groove is formed by attaching a rail member to the housing body.

  In this case, a cushion material may be provided inside the guide groove of the housing body to improve the adhesion with the end of the partition plate inserted into the guide groove (claim 2). In this way, it is possible to further prevent a gap from being generated at the joint between the housing body and the partition plate.

  Moreover, about the above-mentioned acoustic space, a division member may be put in the inside and you may divide | segment into right and left or up and down (Claim 3). In this way, by attaching a speaker to each of the divided acoustic spaces, a high-quality stereo sound without sound leakage can be emitted.

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
FIG. 1A is a plan view showing the electronic keyboard instrument 1. FIG. 1B is a perspective view showing the housing 10. In FIG. 1 (a), in the electronic keyboard instrument 1, the side on which the keyboard 20 is arranged and the performer performs (the upper side in FIG. 1 (a)) is referred to as the “front side”, and the opposite side of the performer's performance side. (The lower side in FIG. 1A) is “rear side”, and the right side and left side of the electronic keyboard instrument 1 viewed from the performer side are “right side” and “left side”, respectively.

[Description of the configuration of the electronic keyboard instrument 1]
As shown in FIG. 1A, the electronic keyboard instrument 1 includes a housing 10 and a keyboard 20 placed on the front side of the housing 10. In addition, since each part structure of the keyboard 20 is based on a well-known technique, detailed description is abbreviate | omitted here.

[Description of Configuration of Housing 10]
As illustrated in FIG. 1B, the housing 10 includes a housing body 11, a shelf plate 12, a partition plate 13, a speaker 14, a duct 15, and a side lid 16.

  Among these, the housing body 11 is configured using an extruded material obtained by extruding an aluminum material. Specifically, the housing body 11 is a long member having a substantially U-shaped cross section, and is configured by a U-shaped central portion 11a and upper and lower wing portions 11b and 11c located on both sides thereof. Has been. Further, the length dimension of the casing body 11 is set substantially equal to the length dimension of the keyboard 20 in the left-right direction. Further, a guide groove 11d for guiding the end portion 13a of the partition plate 13 is formed in the upper wing portion 11b along the extrusion direction of the extruded material, while the partition plate 13 is formed in the lower wing portion 11c. A guide groove 11e for guiding the end portion 13b is formed so as to face the guide groove 11d along the extrusion direction of the extruded material. The guide grooves 11d and 11e are formed by projecting two rail-shaped projecting portions from the upper wing portion 11b and the lower wing portion 11c, respectively. Further, two attachment holes (not shown) for attaching the speakers 14 are formed in the vicinity of the left and right ends of the upper wing portion 11b of the housing body 11, and the speakers 14 are formed in these attachment holes. Each is attached. As a result, the electronic keyboard instrument 1 of the present embodiment has a so-called two-way configuration in which two speakers 14 are arranged on the left and right. Further, one attachment hole (not shown) for attaching the duct 15 is formed in the vicinity of the left and right ends of the lower wing part 11c of the housing body 11, and the duct 15 is formed in each of these attachment holes. It is attached. As a result, the electronic keyboard instrument 1 of the present embodiment has a so-called bass reflex structure.

  Moreover, the shelf board 12 is a board | plate material comprised with the wood material. The length dimension of the shelf plate 12 is set to be approximately equal to the length dimension of the housing body 11. Moreover, the shelf board 12 is comprised so that the keyboard 20 can be mounted in the front side (refer Fig.1 (a)). Moreover, the shelf board 12 is comprised so that the housing body 11 (more specifically, the lower wing | blade part 11c) can be attached to the back side with a bis | screw etc. The shelf board 12 is configured such that a stand (not shown) for supporting the electronic keyboard instrument 1 can be attached to the lower surface of the shelf board 12 with screws or the like.

  Further, the partition plate 13 is a plate material made of an aluminum material, and the length dimension thereof is set substantially equal to the length dimension of the housing body 11. Further, the height of the partition plate 13 is set slightly smaller than the dimension between the guide groove 11d formed in the upper wing part 11b and the guide groove 11e formed in the lower wing part 11c in the housing body 11. In addition, the thickness dimensions of the both end portions 13a and 13b are set to be slightly smaller than the groove width size of the guide grooves 11d and 11e of the housing body 11, and the both end portions 13a and 13b are in a vertically standing posture. Are inserted into the guide grooves 11d and 11e, respectively.

  Further, the side lid 16 has a pair of openings formed at both ends in the left-right direction of the housing body 11 when both ends of the partition plate 13 are inserted into the pair of guide grooves 11d and 11e of the housing body 11, respectively. And is attached to the shelf board 12 and the housing body 11 with screws or the like.

  In the case 10 configured as described above, both end portions 13a and 13b of the partition plate 13 are inserted into the pair of guide grooves 11d and 11e of the case main body 11, respectively. A pair of opening portions 10b, 10b formed at both ends of each are closed by a pair of side covers 16, 16, respectively, thereby forming an acoustic space 10a therein.

In addition, since each part structure in the electronic keyboard musical instrument 1 is based on a well-known technique, detailed description is abbreviate | omitted here.
[effect]
Thus, according to the electronic keyboard instrument 1 of the first embodiment, the following effects can be obtained. That is, in the conventional electronic keyboard instrument, there is a problem that when the upper casing and the lower casing are put together, a gap is easily formed between these joint surfaces, and sound is deteriorated because sound leaks from the gap. . On the other hand, according to the electronic keyboard instrument 1 of the first embodiment, for the case 10, both end portions 13 a and 13 b of the partition plate 13 are inserted into the pair of guide grooves 11 d and 11 e of the case body 11, respectively. In this case, the acoustic space 10a is formed in the interior of the housing body 11 by closing the pair of openings 10b and 10b formed at both ends in the left-right direction with the pair of side covers 16 and 16, respectively. Therefore, it is difficult for a gap to be generated at the joint between the housing body 11 and the partition plate 13, and sound leakage from the acoustic space 10a can be prevented. This also makes it possible to obtain a good sound quality from a low sound range to a high sound range and a sound quality with good response (response) with braking.

  Further, according to the electronic keyboard instrument 1 of the first embodiment, the guide grooves 11d and 11e for inserting the both end portions 13a and 13b of the partition plate 13 are formed as part of the above-described extruded material at the time of extrusion molding. Therefore, a vibration-proof material such as vibration-proof tape is attached to the gap formed on the joint surface of the upper case and the lower case constituting the case like a conventional electronic keyboard instrument so as to fill the gap. There is no need to do anything, and there is no increase in the number of manufacturing steps and manufacturing costs of the extra housing. Further, for example, the guide grooves 11d and 11e can be easily formed as compared with the case where the guide groove is formed by attaching a rail member to the housing body.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, It is possible to implement in the following various aspects.

  (1) In the above embodiment, the casing body 11 is configured using an extruded material obtained by extruding an aluminum material. However, this is not a limitation, and an extruded material obtained by extruding another material such as a resin material, for example. The housing body 11 may be configured using the above.

(2) Moreover, in the said embodiment, although the partition plate 13 is comprised with the aluminum material, this is not restricted, You may comprise the partition plate 13 with other materials, such as a resin material and a woody material.
(3) In the above embodiment, in the casing 10, the guide groove 11d is formed in the upper wing part 11b of the casing body 11, while the guide groove 11e is opposed to the guide groove 11d in the lower wing part 11c. The both ends 13a and 13b of the plate-like partition plate 13 are inserted into the guide grooves 11d and 11e. However, the present invention is not limited to this, and various forms can be considered. For example, as illustrated in FIG. 2A, in the housing 110, a guide groove 111 d is formed in the upper wing portion 111 b of the housing body 111, while the guide groove 111 d is guided to the central portion 111 a of the housing body 111. A groove 111e is formed to face the guide groove 111d, and both end portions 113a and 113b of the plate-like partition plate 113 are inserted into the guide grooves 111d and 111e, respectively. 2B, in the housing 120, a guide groove 121d is formed in the upper wing 121b of the housing body 121, while a guide groove 121e is formed in the central portion 121a of the housing body 121. The guide grooves 121d are formed so as to face each other, and both end portions 123a and 123b of the partition plate 123 having a substantially L-shaped cross section are inserted into the guide grooves 121d and 121e. Even if comprised in this way, there exists an effect similar to the said embodiment.

  (4) In the above-described embodiment, the guide grooves 11d and 11e are formed by projecting two rail-shaped projecting portions from the upper wing portion 11b and the lower wing portion 11c. However, the present invention is not limited to this. As shown in FIG. 2C, in the casing main body 131, guide grooves 131d and 131e are formed from the surfaces of the upper wing portion 131b and the lower wing portion 131c to the inside thereof, respectively. Both end portions 133a and 133b of the partition plate 133 may be inserted into 131e. Even if comprised in this way, there exists an effect similar to the said embodiment.

  (5) In the present embodiment, two speakers 14 are arranged on the left and right. However, the present invention is not limited to this, and by changing the number of mounting holes (not shown) for mounting the speakers 14, for example, One speaker may be arranged on the left and right (so-called full range configuration), or three speakers may be arranged on the left and right (so-called three-way configuration).

  (6) In the above embodiment, for example, a cushion material (not shown) is provided inside the guide grooves 11d and 11e of the housing body 11, and both end portions 13a and 13b of the partition plate 13 inserted into the guide grooves 11d and 11e You may make it improve the adhesiveness of. In this way, it is possible to further reduce the occurrence of a gap at the joint between the housing body 11 and the partition plate 13.

  (7) In the above-described embodiment, the above-described acoustic space may be divided into left and right or up and down by inserting a dividing member therein. As an example, a guide groove is separately formed in each of the central portion 11a, the upper wing portion 11b, the lower wing portion 11c, and the partition plate 13 of the housing body 11, and a separation partition plate is formed inside these four guide grooves. And so on. In this way, by attaching a speaker to each of the divided acoustic spaces, a high-quality stereo sound without sound leakage can be emitted.

  (8) In the above embodiment, the speaker 14 is configured to be attached to the upper portion of the casing 10 (the upper wing portion 11b of the casing body 11). You may comprise so that it may attach to (the center part 11a of the housing body 11), the lower part (lower wing | blade part 11c of the housing body 11), etc.

(A) is a top view which shows an electronic keyboard musical instrument, (b) is a perspective view which shows a housing | casing. (A) It is explanatory drawing (1) which shows the housing | casing of another embodiment, (b) It is explanatory drawing (2) which shows the housing | casing of another embodiment, (c) Explanation which shows the housing | casing of another embodiment It is figure (3).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronic keyboard instrument, 10, 110, 120, 130 ... Case, 10a ... Acoustic space, 10b ... Opening, 11, 111, 121, 131 ... Case main body, 11a , 111a, 121a, 131a ... center portion, 11b, 111b, 121b, 131b ... upper wing, 11c, 111c, 121c, 131c ... lower wing, 11d, 11e, 111d, 111e, 121d, 121e, 131d, 131e ... guide groove, 12 ... shelf plate, 13, 113, 123, 133 ... partition plate, 13a, 13b, 113a, 113b, 123a, 123b, 133a, 133b ... partition End of board, 14 ... Speaker, 15 ... Duct, 16 ... Side cover, 20 ... Keyboard

Claims (3)

An electronic keyboard instrument that uses an enclosure to form an acoustic space,
The housing is
A casing body having a pair of guide grooves formed along an extrusion direction of the extruded material, which is configured by using an extruded material having a partially opened cross section;
A partition plate capable of closing the opening by inserting both ends thereof into the pair of guide grooves,
A pair of side covers capable of closing a pair of openings formed at both ends in the pushing direction of the housing body when both ends of the partition plate are respectively inserted into the pair of guide grooves;
And the both ends of the partition plate are respectively inserted into the pair of guide grooves, and an acoustic space is formed therein by closing the pair of openings with the pair of side lids, respectively. An electronic keyboard instrument. The electronic keyboard instrument according to claim 1,
The housing is
An electronic keyboard instrument, comprising: a cushioning material disposed within the guide groove to enhance adhesion to an end portion of the partition plate inserted into the guide groove. The electronic keyboard instrument according to claim 1 or 2,
The electronic keyboard instrument, wherein the housing includes a dividing member for dividing the acoustic space.

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