JP2013145310A - Electronic keyboard instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate musical sound from a keyboard lid while suppressing thickness and weight of the keyboard lid.SOLUTION: To an instrument body 10, a keyboard lid 20 to be turned by an opening/closing operation is disposed. The keyboard lid 20 comprises a main part 21 to be positioned above a keyboard part KB in a closed state and a front part 22 to be positioned in front of the keyboard part KB. In the main part 21 of the keyboard lid 20, a thin, light-weight and flexible electrostatic type speaker 24 is incorporated.

Description

  The present invention relates to an electronic keyboard instrument in which a speaker is disposed on a keyboard lid.

  2. Description of the Related Art Conventionally, an electronic keyboard instrument in which a speaker is disposed on a keyboard lid is known. For example, in the musical instrument disclosed in Patent Document 1 below, a speaker is incorporated on the back side of the front lid member among the two lid members that are divided and foldably coupled. Then, a musical tone is generated from the speaker in the open state.

Japanese Patent No. 4207742

  However, the musical instrument disclosed in Patent Document 1 has a drawback that the speaker built in the keyboard lid is a cone speaker, so that not only the thickness of the keyboard lid is increased, but also the opening / closing operation is increased due to the large weight.

  The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide an electronic keyboard instrument that can generate musical sounds from the keyboard lid while suppressing the thickness and weight of the keyboard lid. It is in.

  In order to achieve the above object, an electronic keyboard instrument according to claim 1 of the present invention comprises a musical instrument main body (10) provided with a keyboard portion (KB), and is rotated with respect to the musical instrument main body by an opening / closing operation. A keyboard lid (20) that is displaced between a closed state that covers the keyboard portion and an open state that exposes the keyboard portion so as to be playable, and an electrostatic speaker (24) is built in the keyboard lid. And

  Preferably, it has a maintenance means (13, 28) for maintaining the keyboard lid at an open / closed position in the middle of the entire rotatable region of the keyboard lid (Claim 2). Preferably, the keyboard cover is provided so as to be rotatable with respect to a rotating member (15) that rotates with respect to the instrument body. Preferably, the electrostatic speaker is provided so as to be rotatable relative to the keyboard lid.

  Preferably, the keyboard lid has a main part (21) positioned above the keyboard part in a closed state and a front part (22) positioned in front of the keyboard part, and the electrostatic speaker is The main part of the keyboard lid is disposed on the main part, and sound can be emitted from both the front and back surfaces of the main part (Claim 5). Preferably, the keyboard cover is provided with a plurality of sound emission holes (25a) for emitting sound of the electrostatic speaker, and the keyboard cover is movably provided with the plurality of sound emission holes. An openable / closable shutter member (27) is provided. Preferably, the electrostatic speaker is arranged over the entire width of the keyboard part.

  In addition, the code | symbol in the said parenthesis is an illustration.

  According to the first aspect of the present invention, it is possible to generate a musical tone from the keyboard lid while suppressing the thickness and weight of the keyboard lid.

  According to the second aspect, the sound direction can be adjusted by the opening / closing position of the keyboard lid.

  According to the third and fourth aspects, the posture and position of the electrostatic speaker can be made variable, and the position of the sound source and the sound direction can be adjusted.

  According to the fifth aspect, the musical sound can be generated even in the closed state.

  According to the sixth aspect, the sound of the electrostatic speaker can be sound-insulated as desired.

  According to the seventh aspect, the sound source can be widely felt in the lateral direction.

1 is a top view, a front view, and a right side view of a closed state of an electronic keyboard instrument according to an embodiment of the present invention. It is the front view of the electronic keyboard instrument in the open state, and a right side view. It is the upper side figure of the right end part of this electronic keyboard musical instrument in a closed state, and the upper right side figure. It is the front view of the upper right side of the electronic keyboard instrument which employ | adopts the keyboard cover of a modified example, and the right side view of the upper part of the open state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIGS. 1A, 1B, and 1C are a top view, a front view, and a right side view of a closed state of an electronic keyboard instrument according to an embodiment of the present invention. 2 (a) and 2 (b) are a front view and a right side view of the electronic keyboard instrument in the opened state. Hereinafter, the vertical direction and the horizontal direction will be referred to based on FIG. 1B, and the front side is the side where the player is located (the front side of FIG. 1B).

  As shown in FIGS. 1 and 2, the electronic keyboard instrument includes a keyboard part KB in a musical instrument main body 10 supported by a leg part 11, and a pair of left and right cone speakers 12 are provided below the keyboard part KB. The musical instrument body 10 is provided with a keyboard lid 20 that is rotated and opened / closed. The keyboard lid 20 is rotated relative to the instrument main body 10 about the pivot shaft portion 14 to be in a closed state (closed state) covering the keyboard portion KB and an open state in which the keyboard portion KB is exposed to be playable. Displaced to (opened state). The keyboard part KB includes a main part 21 positioned above the keyboard part KB and a front part 22 positioned in front of the keyboard part KB in the closed state.

  On the left and right side portions of the main portion 21 on the axis of the rotation shaft portion 14, the adjustment portion 13 is provided so as to protrude. Depending on the degree of tightening of the adjusting portion 13, the load on the turning operation of the keyboard lid 20 around the turning shaft portion 14 can be adjusted. Adjustment is possible even at an open / closed position in the middle of the entire rotatable region of the keyboard lid 20. Therefore, for example, if the adjustment unit 13 is tightened with the keyboard lid 20 in a desired opening / closing position, the keyboard lid 20 is stably maintained at the opening / closing position. If it is tightened weakly, the keyboard lid 20 can be rotated by hand, and if it is released, it can be maintained in its open / closed position.

  The main portion 21 of the keyboard lid 20 incorporates an electrostatic speaker 24 (also called TLF (Thin / Light / Flexible)). The electrostatic speaker 24 is a so-called surface speaker that is thin, light, flexible and flexible, and has a known configuration disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-68053.

  As a schematic configuration, the electrostatic speaker 24 includes two electrodes facing each other with a gap therebetween, and a conductive sheet-like vibrating body inserted between the two electrodes. When a predetermined bias voltage is applied to the vibrating body and the voltage applied to the electrode is changed, the electrostatic force acting on the vibrating body is changed, and thereby the vibrating body is displaced. If this applied voltage is changed according to the input acoustic signal, the vibrating body repeats displacement (that is, vibrates) accordingly, and a reproduction wave corresponding to the acoustic signal is generated from the vibrating body.

  In general, an electrostatic speaker is not excellently used as a main speaker in an electronic keyboard instrument because it does not have excellent acoustic characteristics in a low sound range. However, electrostatic speakers have characteristics that are not found in cone speakers.

  For example, an electrostatic loudspeaker generates a plane wave, and the larger the area of the flat plate, the stronger the directivity of the sound in the direction perpendicular to the flat plate. As a result, the electrostatic speaker has a long reach. Furthermore, sound can be emitted from both sides. In particular, the thin flexible electrostatic speaker is small and light, and has flexibility, so that it has flexibility in shape such as bending and twisting.

  Therefore, in the present embodiment, the electrostatic speaker 24 is disposed on the keyboard lid 20 to change the direction. The electrostatic speaker 24 is disposed over the entire width of the keyboard part KB.

  3 (a) and 3 (b) are top views of the right end portion of the electronic keyboard instrument in the closed state, and FIG. 3 (c) is a right side view of the upper portion. Show. Hereinafter, for the main part 21 of the keyboard lid 20, the upper surface and the lower surface in the closed state are referred to as the front surface and the back surface, respectively.

  As shown in FIG. 3C, the front side plate member 25 is disposed flush with the surface of the main portion 21, and the back side plate member 26 is disposed flush with the back surface of the main portion 21. As shown in FIG. 3A, the front side plate member 25 is made of a punching metal or a mesh type member in which a large number of sound emission holes 25a are formed. The sound emission holes 25a and the non-hole portions 25b are arranged in a grid pattern alternately in front, rear, left and right. The back side plate member 26 is similarly configured.

  An electrostatic speaker 24 is disposed between the front side plate member 25 and the back side plate member 26. A shutter member 27 is disposed between the front side plate member 25 and the electrostatic speaker 24 so as to face and come into contact with the front side plate member 25. The plate members 25 and 26, the electrostatic speaker 24, and the shutter member 27 are parallel.

  The shutter member 27 is configured to be slidable in the front-rear direction or the left-right direction, and is displaced in the front-rear direction, for example, by manually operating the knob 23. In the shutter member 27, sound emitting holes and non-hole portions similar to the sound emitting holes 25a and non-hole portions 25b are formed at similar arrangement intervals. By operating the knob 23, the shutter member 27 can be displaced between the front position and the rear position.

  When the shutter member 27 is set to the front position, the sound emission holes and non-hole portions of the shutter member 27 coincide with the positions of the sound emission holes 25a and non-hole portions 25b of the front side plate member 25 (see FIG. 3A). In this case, since the sound emission hole 25a is opened, the sound emitted from the electrostatic speaker 24 is emitted to the front side through the sound emission hole of the shutter member 27 and the sound emission hole 25a of the front side plate member 25. On the other hand, when the shutter member 27 is moved to the rear position, the sound emission hole of the shutter member 27 coincides with the position of the non-hole portion 25b of the front plate member 25 (see FIG. 3B). In this case, since the sound emission hole 25a is closed, the sound emitted from the electrostatic speaker 24 is sound-insulated. Such an operation of the position of the shutter member 27 is possible regardless of the opening / closing position of the keyboard lid 20.

  Since the rear plate member 26 is not provided with a shutter member, the sound emitted from the electrostatic speaker 24 is always emitted. Therefore, if the keyboard cover 20 is opened and the shutter member 27 is set to the front position (open), sound can be emitted simultaneously from both the front surface and the back surface of the keyboard cover 20.

  However, the shutter member 27 may be provided on both the front and back sides of the keyboard lid 20 or only on the back surface. In the case of providing both the front and back sides, for example, it is possible to use sound insulation on the back surface when the cover is closed and sound insulation on the surface when the cover is opened. Note that the mechanism for opening and closing the sound emission hole 25 a may not be a mechanism that slides like the shutter member 27. Moreover, it is good also as a structure which does not provide the sound emission hole 25a about the surface of the keyboard cover 20, and is sounded only from the back surface. The sound emitting hole may be formed directly in the main portion 21 without providing the front side plate member 25 or the back side plate member 26.

  Although not shown, the electronic keyboard instrument includes a tone generator circuit that converts performance data input from the keyboard KB, preset performance data, and the like into musical tone signals and an effect circuit that imparts various effects to the musical tone signals. The musical sound signal is supplied to both the cone speaker 12 and the electrostatic speaker 24. However, the signals may be separated, and only the mid- and high-range musical sound signals may be converted into sound by the electrostatic speaker 24. The electrostatic speaker 24 not only brings about a change in sound, but is also suitable for assisting and monitoring sound in the middle and high sounds.

  According to the present embodiment, since the lightweight and thin electrostatic speaker 24 is built in the keyboard lid 20, it is possible to generate musical sounds from the keyboard lid 20 while suppressing the thickness and weight of the keyboard lid 20. The opening / closing operation of the keyboard lid 20 does not become heavy. Further, since the electrostatic speaker 24 is arranged over the entire width of the keyboard part KB, the sound source can be felt widely in the lateral direction. For example, even if the player moves his / her head from side to side, the sound can always be heard from near. In particular, the electrostatic speaker 24 is a so-called surface sound source, and gives the player a sound different from a point sound source such as a cone speaker. Therefore, the sound felt by the player, such as the position of the sound source and the spread of the sound, can be made different from the sound of the electronic musical instrument.

  In addition, since the adjusting unit 13 serves as a maintaining means for maintaining the keyboard lid 20 at a desired opening / closing position, the sound direction can be adjusted at the opening / closing position of the keyboard lid 20, and the sound spread can be made variable. The sound felt by the player can be changed in various ways. The configuration of the maintaining means is not limited to the adjusting unit 13 and may be a stopper or the like that locks the keyboard lid 20 in a stepwise position.

  Moreover, since sound can be emitted from both the front and back surfaces of the main portion 21 of the keyboard lid 20, it is possible to generate a musical tone even in the closed state. This is suitable not for performance but for automatic performance based on performance data, for example.

  In addition, a shutter member 27 that is movable and can freely open and close a plurality of sound emission holes 25a is disposed on the front side of the main portion 21 of the keyboard lid 20, so that sound can be transmitted to the front side of the electrostatic speaker 24 as desired. Sound insulation is possible.

  By the way, in this Embodiment, it was the structure which the electrostatic speaker 24 rotates centering on the rotating shaft part 14 by rotating the keyboard cover 20 centering on the rotating shaft part 14. FIG. However, the modification shown in FIG. 4 may be employed as a configuration in which the angle and orientation of the electrostatic speaker 24 are variable.

  FIGS. 4A and 4B are a front view and a right side view of the upper right side of the electronic keyboard instrument that employs the keyboard cover 20 of the modified example in the open state.

  As shown in FIGS. 4A and 4B, the instrument body 10 is provided with a pair of left and right rotating members 15 (only the right side is shown) so as to be rotatable about the rotating shaft portion 14. . Depending on the degree of tightening of the adjusting portion 13, the load on the turning operation of the turning member 15 around the turning shaft portion 14 can be adjusted. The keyboard lid 20 is provided at the distal end portion of the rotation member 15 so as to be rotatable about the rotation shaft portion 29. The rotation shaft portion 29 is parallel to the left-right direction (key arrangement direction).

  On the left and right side portions of the main portion 21 on the axis of the rotation shaft portion 29, an adjustment portion 28 having the same configuration as the adjustment portion 13 is provided so as to protrude. Depending on the degree of tightening of the adjusting portion 28, the load on the turning operation of the keyboard lid 20 with respect to the turning member 15 around the turning shaft portion 29 can be adjusted.

  Although detailed illustration is omitted, the configurations of the front side plate member 25, the back side plate member 26, the electrostatic speaker 24, and the shutter member 27 are the same as those shown in FIGS.

  According to the modification of FIG. 4, the rotating member 15 is rotatable relative to the instrument body 10, and the keyboard lid 20 is rotatable relative to the rotating member 15. Therefore, the keyboard lid 20 can be rotated and displaced by the two-stage rotation mechanism with respect to the musical instrument body 10. In addition, the position can be maintained in the middle of each of the two-stage rotation regions by the tightening operation of the adjusting portions 13 and 28. Therefore, the keyboard cover 20 can be made variable not only in the angle but also in the position of the rotation center.

  Thereby, the posture and position of the electrostatic speaker 24 can be made variable, and the position of the sound source and the sound direction can be adjusted. Since the electrostatic speaker 24 has high directivity, not only can the sound transmission direction be made variable by directing it at a desired angle at a desired position, and the middle and high sound ranges can be mainly provided in the desired direction. The sound for players will also change greatly. For example, if it is pointed directly at the player, the feeling of spreading up and down with the cone speaker 12 can be increased, or it can be reflected on the wall in the room and reach the player. Therefore, the sound direction can be changed in the vertical direction, and various changes in the sound using the reflection of the sound on the wall or ceiling of the room can be realized.

  In the example of FIG. 4, the posture of the keyboard lid 20 is variable with respect to the musical instrument main body 10 by being integrated with the electrostatic speaker 24 by a two-stage rotation mechanism, but is not limited thereto. For example, the electrostatic speaker 24 is configured to rotate relative to the keyboard lid 20 that is rotated by a one-step rotation mechanism as shown in FIGS. Also good. Alternatively, a rotating mechanism having three or more stages may be interposed between the electrostatic speaker 24 and the musical instrument main body 10, or rotating mechanisms having different axial directions may be mixed.

  In addition, the rotation direction of the electrostatic speaker 24 described above and the settable positions and postures are examples, and are not limited to those illustrated.

  The electrostatic speaker 24 can be incorporated in a lid of a device other than a keyboard instrument, and can be applied to an open / close lid of a musical instrument case such as a guitar.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included.

  DESCRIPTION OF SYMBOLS 10 Musical instrument main body, 13, 28 Adjustment part (maintenance means), 15 Rotating member, 20 Keyboard cover, 21 Main part, 22 Front part, 24 Electrostatic speaker, 25a Sound emission hole, 27 Shutter member, KB Keyboard part

Claims (7)

A musical instrument body with a keyboard part,
A keyboard lid that rotates with respect to the instrument body by an opening and closing operation, and that displaces between a closed state that covers the keyboard part and an open state that exposes the keyboard part to be playable;
An electronic keyboard instrument comprising an electrostatic speaker built in the keyboard lid.   2. An electronic keyboard instrument according to claim 1, further comprising a maintaining means for maintaining the keyboard cover at an open / closed position in the middle of the entire rotatable region of the keyboard cover.   3. The electronic keyboard instrument according to claim 1, wherein the keyboard lid is provided so as to be rotatable with respect to a rotating member that rotates with respect to the instrument body.   The electronic keyboard instrument according to claim 1, wherein the electrostatic speaker is provided so as to be rotatable relative to the keyboard cover.   The keyboard lid has a main portion located above the keyboard portion in a closed state and a front portion located in front of the keyboard portion, and the electrostatic speaker is disposed in the main portion of the keyboard lid. The electronic keyboard instrument according to claim 1, wherein sound can be emitted from both a front surface and a back surface of the main part.   The keyboard cover is provided with a plurality of sound emission holes for emitting sound of the electrostatic speaker, and the keyboard cover is provided with a shutter member that is movable and can freely open and close the plurality of sound emission holes. The electronic keyboard instrument according to claim 1, wherein the electronic keyboard instrument is provided.   The electronic keyboard instrument according to claim 1, wherein the electrostatic speaker is disposed over the entire width of the keyboard portion.

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