JP2005189823A - Keyboard instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyboard instrument which gives an excellent feeling of operation and can be manufactured at low costs. <P>SOLUTION: An outer part 14 of a key is a part which is visible from outside after a musical instrument is assembled, and also a part that a player touches to press the key. An inner part 15 of the key is a part which is disposed inside the outer part 15 and invisible from outside. The outer part 14 is molded out of a 1st resin material, for example, a styrene group polymer and the inner part 15 is molded out of a 2nd resin material, for example, ABS different from the 1st resin material. Those outer part 14 and inner part 15 are molded by what is called a double injection molding method. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a keyboard device for a musical instrument having a plurality of keys formed of resin.

Conventionally, as a key structure applied to a keyboard device, one that is integrally formed of resin, or one that is made by sticking resin or the like on the surface (upper surface) that is a key pressing surface using wood as a base material is generally known. Yes. In Japanese Patent Laid-Open No. 2003-271126 (Patent Document 1), a key base made of a resin having a cross-sectional “D” shape in which an upper plate portion and a lower plate portion are connected by a connecting portion is formed, and a wood is formed in the concave portion. The key provided by embedding the wood part formed by the above is disclosed.
JP-A-8-305346

  However, in order to prevent the occurrence of “sinking”, a key formed integrally with a resin is often formed with a hollow portion such as a U-shaped cross section. For this reason, there is a problem that the rigidity is lowered and the operational feeling is not good.

  In addition, the key disclosed in Patent Document 1 requires a man-hour for manufacturing a key base and a wood part, and assembling them by bonding them together, resulting in an increase in manufacturing cost.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a keyboard device that has a good operational feeling and can be manufactured at low cost.

  In order to achieve this object, a keyboard device according to claim 1 is formed of a first resin material and is formed on a top surface of a key and forms a visible portion, and the first resin material is different from the first resin material. And a plurality of keys formed by a double injection molding method, which is made of a resin material of 2 and is located at the lower portion of the outer portion and has an inner portion having a swing fulcrum at the rear portion so that the key can swing. .

  The keyboard device according to claim 2 is the keyboard device according to claim 1, wherein the outer portion has an upper surface that covers an upper portion of the inner portion, and four surfaces that are connected to the upper surface, the left and right sides, and the front side surface. These four surfaces are formed in a box shape having a substantially uniform thickness.

  According to a third aspect of the present invention, in the keyboard device according to the first or second aspect, the inner portion includes a stroke restricting portion for restricting a key stroke at a lower portion and a sensor for detecting that the key is pressed. The actuator part to drive is formed.

  A keyboard device according to a fourth aspect is the keyboard device according to any one of the first to third aspects, wherein the first resin material is a polystyrene resin.

  The keyboard device according to claim 5 is the keyboard device according to any one of claims 1 to 4, wherein the second resin material is an ABS resin.

  According to the keyboard device of the first aspect, the first resin material is formed of the second resin material different from the first resin material, and the outer portion of the upper surface of the key that forms the visible portion. Since it has a plurality of keys formed by a double injection molding method with the inner part having a swing fulcrum at the rear part so that the key can be swung at the lower part of the outer part, the operational feeling is good Therefore, there is an effect that it can be manufactured at low cost.

  According to the keyboard device of the second aspect, in addition to the effect produced by the keyboard device of the first aspect, the outer portion has four surfaces, an upper surface covering the upper portion of the inner portion and the left and right and front side surfaces connected to the upper surface. Since these four surfaces are formed in a box shape having a substantially uniform thickness, the outer portion and the inner portion are firmly fixed, and even if the outer portion is formed of an expensive material, the keyboard There is an effect that the cost of the apparatus can be reduced.

  According to the keyboard device according to claim 3, in addition to the effect of the keyboard device according to claim 1 or 2, the inner portion has a stroke restricting portion for restricting the key stroke at the lower portion, and the key is pressed. Therefore, the key can be formed at a lower cost than the case where the key is formed of a single resin material.

  According to the keyboard device of the fourth aspect, in addition to the effect produced by the keyboard device according to any one of the first to third aspects, the first resin material is a polystyrene resin, so that the upper surface of the key is glossy. There is an effect that it can be formed on a hard surface.

  According to the keyboard device of the fifth aspect, in addition to the effect exhibited by the keyboard device according to any one of the first to fourth aspects, the second resin material is an ABS resin, so that it is formed at a lower cost. There is an effect that can be.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing a configuration of an electronic accordion 1 having a key 4 according to the present invention. The external appearance of the electronic accordion 1 is the same as that of the acoustic accordion. The keyboard 2 is played with the right hand, the keyboard 3 is played with the left hand, the registration button 9, the bellows 11, and the sound source. Part 13.

  The keyboard 2 played with the right hand is composed of a plurality of keys 4, and the keys swing around one end as a fulcrum, and are composed of white keys and black keys like piano keys. These keys 4 are assigned to the pitch of each semitone.

  On the other hand, the keyboard 3 played with the left hand is composed of a plurality of buttons 5 and operates in the axial direction. These buttons 5 are assigned to chords and bass sounds.

  Each key 4 is provided with a switch 6 which is a sensor for detecting key depression or release, and each button 5 is provided with a switch 7, which is a key signal indicating which key 4 or button 5 has been operated. Is generated.

  The electronic accordion 1 includes a plurality of registration buttons 9 on each of the keyboard 2 and the keyboard 3, and each registration button 9 is assigned with a tone color of a musical tone generated by playing the keyboard 2 and the keyboard 3 in advance. It has been. Each registration button 9 is provided with a sensor (switch) 10 for detecting an operation.

  The bellows 11 is constituted by a bellows similarly to the acoustic accordion, and when the bellows is extended, air is sucked into the bellows, and when compressed, the internal pressure becomes high. In the case of an acoustic accordion, a musical tone is generated by blowing this compressed air on the reed. In the case of the electronic accordion 1, a pressure sensor 12 is provided inside the bellows 11. The pressure sensor 12 outputs a pressure value that is known and proportional to the pressure inside the bellows 11.

  The electronic accordion 1 is provided with a sound source unit 13, a battery for supplying power to the sound source unit 13, and a speaker (not shown).

  The sound source unit 13 includes a microcomputer constituted by a CPU, a ROM, and a RAM, and a sound source controlled by the microcomputer. Signals detected by the switch 6 provided on the key 4 of the keyboard 2, the switch 7 provided on the button 5 of the keyboard 3, the switch 10 provided corresponding to the registration button 9, and the pressure sensor 12 of the bellows 11. Is input to the microcomputer, and when the keyboard 2 instructs the generation of a musical tone, the sound source is controlled so as to generate the musical tone with the tone selected by the registration button 9. The sound source generates music according to instructions from the microcomputer, and the music is emitted from the speaker.

  Next, the keyboard 2 will be described with reference to FIG. FIG. 2 is a perspective view showing the keyboard 2 played with the right hand. The keyboard 2 includes a white key 4a corresponding to a stem sound and a black key 4b corresponding to a derived sound. These keys 4 are formed with dimensions that are smaller in length, width, and thickness than those used in commonly used pianos.

  Next, the key 4 will be described with reference to FIGS. 3 is an external perspective view of the white key 4a, and FIG. 4 is an external perspective view of the outer portion 14 and the inner portion 15 constituting the white key 4a. 5 is an external perspective view of the black key 4b, and FIG. 6 is an external perspective view of the outer portion 14 and the inner portion 15 constituting the black key 4b.

  These keys 4 are formed by injection molding resin, and the white key 4 a and the black key 4 b are constituted by an outer portion 14 and an inner portion 15. The outer portion 14 of the key is a portion that can be seen from the outside in the assembled state with the key 4 as an instrument, and is a portion that can be touched by the performer to press the key. The inner part 15 of the key is located below the outer part 14 and is not visible from the outside.

  The outer portion 14 is molded from a first resin material, such as polystyrene resin, and the inner portion 15 is molded from a second resin material different from the first resin material, such as ABS resin (acrylonitrile, butadiene, styrene resin). The These resins are molded by a so-called double injection molding method. That is, first, when the first resin is injected into the mold in which the inner part 15 is composed of the upper mold and the lower mold and the first resin material is hardened, only the lower mold is removed, and the outer part 14 is removed. It is formed by injecting the second resin between the first resin material and a new lower mold by replacing with the lower mold formed in the outer shape.

  On the contrary, the outer part 14 is formed by injecting the second resin into the mold composed of the upper mold and the lower mold first, and when the outer part 14 is solidified, only the upper mold is removed and the inner part is removed. 15 may be replaced with the upper mold formed in the outer shape, and molding may be performed by injecting the first resin material between the second resin material and the new upper mold.

  A spring seat 21 that locks a spring 20 (see FIG. 7 or FIG. 8) for holding the key 4 in the stop position is formed at the rear end of the outer portion 14. A bearing 18 for pivotally locking the key 4 is formed at the rear end of the inner portion 15, and when the key 4 is pressed, the key 4 is pressed at the center in the longitudinal direction of the key 4. An actuator portion 22 for driving the switch 6 (see FIG. 7 or FIG. 8) for detecting this is formed, and a stroke restricting portion 23 for restricting the stroke at which the key 4 swings is formed in front of the actuator portion 22. ing.

  Next, the key 4 will be described in more detail with reference to FIGS. FIG. 7 is a cross-sectional view taken along a plane perpendicular to the longitudinal direction of the white key 4 a in a state assembled to the chassis 16, and FIG. 8 is perpendicular to the longitudinal direction of the black key 4 b in the state assembled to the chassis 16. It is sectional drawing cut | disconnected by the flat plane.

  As shown in FIGS. 7 and 8, in the white key 4a and the black key 4b, the outer portion 14 has four surfaces (upper surface, left side surface, right side surface and front side surface) so as to cover the inner portion 15 from above. These surfaces are formed of a resin having a substantially uniform thin thickness. The inner portion 15 is formed by filling the internal space 17 formed by these four surfaces with the second resin.

  A bearing 18 is formed at the rear portion of the inner portion 15 so that the key 4 swings, and is fitted to a shaft 19 fixed to the chassis 16. When the key 4 is pressed, the key 4 rotates from the stop position to the pressed position against the urging force of the spring 20. The spring 20 is to hold the key at the stop position in a normal state.

  A spring seat 21 that locks one end of the spring 20 is formed at the rear portion of the outer portion 14, and a spring seat that locks the other end of the spring 20 is positioned on the chassis 16 so as to face the spring seat 21. Is formed.

  In the center of the inner portion 15, an actuator portion 22 for pressing the switch 6 provided on the chassis 16 is formed. The switch 6 is provided with a contact point on a dome-shaped movable part made of rubber. When the key 4 is pressed, the contact point connects an electrode formed on the printed circuit board 28 fixed on the chassis 16. It is configured as follows.

  A U-shaped stroke restricting portion 23 for restricting the stroke of the key 4 is formed in front of the actuator portion 22, and a lower limit restricting surface 25 for restricting the lower limit of the stroke is formed on the upper portion of the stroke restricting portion 23. An upper limit regulating surface 26 for regulating the upper limit of the stroke is formed in the lower part.

  The chassis 16 is formed with regulation surface abutting portions 24 that abut against these regulation surfaces. A felt 27 is attached to the upper surface of the regulation surface abutment portion 24 at a position that abuts against the lower limit regulation surface 25. A felt 28 is affixed to the lower surface of the abutting portion 24 at a position where it abuts on the upper limit regulating surface 26.

  As described above, in the keyboard device of the present invention, the outer part 14 that forms the upper part of the key 4 by the double injection method, and the inner part 15 are formed at the lower part of the outer part 14. The outer portion 14 is formed of a first resin material with a substantially uniform thickness, and the inner portion 15 is positioned at the lower portion of the outer portion 14, and a bearing 18 that pivotally locks the key 4 and the switch 6 The actuator unit 22 for driving the stroke and the stroke regulating unit 23 for regulating the stroke of the key 4 are provided.

  Therefore, the outer portion 14 can be formed of a hard and glossy first resin material, and the inner portion 15 can be formed of an inexpensive resin with relatively low rigidity. Therefore, the operational feeling of the key 4 can be improved and the resin material can be formed at a low cost. Further, it is not necessary to form the outer portion 14 and the inner portion 15 and then assemble these members, and the key 4 can be manufactured at a lower cost.

  Although the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  For example, in the above embodiment, the keyboard device according to the present invention is applied to an electronic accordion, but may be applied to an acoustic piano, organ, synthesizer, electronic keyboard, and the like.

  In the above embodiment, the spring seat 21 is provided at the rear part of the key 4, and when the key 4 is not depressed, the key 4 is held at the stop position by the urging force of the spring 20. The rear end of the resin to be formed is formed in a leaf spring shape, and when the key 4 is not pressed using the plasticity of the resin, the resin 4 may be held at a stop position and bend when the key is pressed. .

In the above embodiment, the outer portion 14 has four substantially uniform thin surfaces (upper surface, left side surface, right side surface, and front side surface) so as to cover the inner portion 15 from above. In addition to these four surfaces, the rear side surface may be formed in the same manner, and the inner portion 15 may be covered with the five surfaces from above.

  In the above embodiment, the spring seat 21 is formed on the outer side portion 14, but the spring seat 21 may be formed on the inner side portion 15.

It is an external view which shows the external appearance of the electronic accordion provided with the keyboard apparatus by this invention. It is a perspective view which shows a keyboard apparatus. It is a perspective view which shows the external appearance of a white key. It is a perspective view of the outer side part and inner side part which comprise a white key. It is a perspective view which shows the external appearance of a black key. It is a perspective view of the outer side part and inner side part which comprise a black key. It is sectional drawing which shows the cross section of the longitudinal direction of a white key. It is sectional drawing which shows the cross section of the longitudinal direction of a black key.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic accordion 2 Keyboard apparatus 4 Key 4a White key 4b Black key 14 Outer part 15 Inner part 16 Chassis 22 Actuator part 23 Stroke restriction part

Claims (5)

  An outer portion formed of a first resin material and forming a portion that is visible on the upper surface of the key, and a second resin material different from the first resin material, located at a lower portion of the outer portion, A keyboard device comprising: a plurality of keys formed by a double injection molding method with an inner portion having a swing fulcrum at the rear so that can swing.   The outer portion has an upper surface that covers the upper portion of the inner portion, and four surfaces that are connected to the upper surface, left and right, and the front side surface, and these four surfaces are formed in a box shape having a substantially uniform thickness. The keyboard device according to claim 1, wherein:   The inner side portion forms a stroke restricting portion for restricting the stroke of the key and an actuator portion for driving a sensor for detecting that the key is pressed at the lower portion. The keyboard device described.   The keyboard device according to claim 1, wherein the first resin material is a polystyrene resin. The keyboard device according to claim 1, wherein the second resin material is an ABS resin.

Images