JP2012145790A - Keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyboard device in which a key touch feeling approximate to an acoustic piano can be obtained during a keying operation without using a hammer member.SOLUTION: A keyboard device includes: a plurality of key guide units 11 which are provided on a keyboard chassis 2 for guiding a plurality of keys 6 vertically, respectively; a plurality of load imparting members 20 which are provided in the plurality of key guide units 11, respectively, and, when keying operations are performed on the plurality of keys 6, impart loads caused by friction resistance to the keys 6 on which the keying operation have been performed, respectively; and a plurality of load departing units 29 which are provided in the plurality of keys 6, respectively, and, when ending push-down actions of the keys 6 on which the keying operations have been performed, depart the loads imparted to the keys 6 by the load imparting members 20, respectively. Therefore, without using a hammer member, a key touch can surely be made heavy by imparting the loads to the keys 6 during keying operations, and key touch feelings releasing the key loads can be obtained by rapidly lightening the key loads through the load departing units 29, so that playability can be improved.

Description

  The present invention relates to a keyboard device used for a keyboard instrument such as an electronic piano or an electronic organ.

  Conventionally, in a keyboard device such as an electronic piano, as described in Patent Document 1, a key guide portion is provided on the keyboard chassis in order to prevent lateral movement of a key that is rotatably arranged on the keyboard chassis. In addition to providing a load on the key and increasing the load on the key, the key guide portion is provided with an elastic portion that is inserted into the key and elastically deformed in the front-rear direction of the key, and on both sides of the elastic portion. There is known a configuration in which a sliding portion and a friction portion provided at the tip of an elastic portion are provided.

JP 2008-145819 A

  In such a conventional keyboard device, when the key is pressed, the sliding portion of the key guide portion slides in contact with both side surfaces inside the key, thereby preventing the key from shaking. The friction part of the elastic part is configured to apply a load due to frictional resistance to the key by sliding in contact with the inner surface of the key located in the front-rear direction by the elastic force of the elastic part.

  However, in such a conventional keyboard device, since the elastic portion of the key guide portion is always in elastic contact with the key with a certain elastic force, when the key is pressed, even when the key pressing operation starts, In addition, there is a problem that a key touch feeling similar to an acoustic piano cannot be obtained because a certain load is applied to the key even at the end of the key pressing operation.

  In order to solve such a problem, in the conventional keyboard device, in addition to providing a key guide portion for applying a load to the key in the keyboard chassis, each keyboard has an action load applied to the key according to the key pressing operation. A structure in which a hammer member for imparting the pressure is attached so as to be rotatable in the vertical direction has been developed.

  However, in a keyboard device equipped with such a hammer member, a plurality of hammer members must be provided on the keyboard chassis in correspondence with a plurality of keys, which increases the number of parts, makes the assembly work complicated, and makes the manufacturing cost expensive. In addition to the increase in the height, the weight of the hammer member makes the entire apparatus extremely heavy, causing problems such as inconvenient carrying.

  The problem to be solved by the present invention is to provide a keyboard device that can obtain a key touch feeling similar to an acoustic piano during a key pressing operation without using a hammer member.

  The present invention provides a keyboard device in which a plurality of keys are arranged in parallel with a plurality of keys mounted on a keyboard chassis so as to be rotatable in the vertical direction, and are provided on the keyboard chassis, and each of the plurality of keys is guided in the vertical direction. A plurality of key guide portions that are provided, and each of the plurality of key guide portions is provided with a load caused by frictional resistance when the plurality of keys are pressed. A plurality of load applying members and a plurality of the load applying members that release the load applied to the keys by the load applying member when the pressing operation of the plurality of keys that have been pressed and operated is completed. And a load application release unit.

  According to the present invention, when a key is pressed, the load applying member can apply a load due to frictional resistance to the key that has been pressed, thereby increasing the key load and pressing the key. When the key operation is finished, the key load can be sharply reduced by the load application release unit to obtain a key touch feeling that allows the key load to escape. For this reason, it is possible to obtain a key touch feeling similar to an acoustic piano without using a hammer member, and it is possible to quickly return the key to the initial position, thereby improving performance, The overall weight of the device can be significantly reduced, and this makes it possible to provide something that is convenient to carry.

It is sectional drawing which showed Embodiment 1 which applied this invention to the keyboard musical instrument. FIG. 2 is an enlarged cross-sectional view showing a main part of a key guide portion as viewed from the AA arrow of the keyboard instrument shown in FIG. FIG. 3 is an enlarged cross-sectional view of a main part illustrating a state in which a key is pressed and a friction deformation portion of a load applying member is elastically deformed to apply a load to the key in the key guide portion illustrated in FIG. 2. FIG. 4 is an enlarged cross-sectional view of a main part illustrating a state in which the load applied to the key is released by the load application release unit when the key is further pushed down in the key guide unit shown in FIG. 3. It is the figure which showed the characteristic of the key stroke and key load in the keyboard musical instrument shown in FIG. In Embodiment 2 which applied this invention to the keyboard instrument, it is the expanded sectional view which showed the principal part of the key guide part. FIG. 7 is an enlarged cross-sectional view of a main part illustrating a state in which the key is pressed and the friction deformation portion of the load applying member is elastically deformed to apply a load to the key in the key guide portion illustrated in FIG. 6. FIG. 8 is an enlarged cross-sectional view of a main part showing a state in which the load applied to the key is released by the load application release unit when the key is further pushed down in the key guide unit shown in FIG. 7. In Embodiment 3 which applied this invention to the keyboard instrument, it is the expanded sectional view which showed the principal part of the key guide part. FIG. 10 is an enlarged cross-sectional view of a main part illustrating a state in which the key is pressed and the friction deformation portion of the load applying member is elastically deformed to apply a load to the key in the key guide portion illustrated in FIG. 9. FIG. 11 is an enlarged cross-sectional view of a main part illustrating a state in which the load applied to the key is released by the load application release unit when the key is further pressed down in the key guide unit illustrated in FIG. 10.

(Embodiment 1)
A first embodiment in which the present invention is applied to a keyboard instrument will be described below with reference to FIGS.
As shown in FIG. 1, the keyboard instrument includes a musical instrument case 1. The musical instrument case 1 includes a keyboard chassis 2 that also serves as a lower case, and an upper case 3 that is provided at the upper rear side of the keyboard chassis 2 (upper right side in FIG. 1).

  Inside the musical instrument case 1, as shown in FIG. 1, a keyboard portion 4 is arranged in a state of being exposed upward. Various electronic components necessary for the musical instrument such as a circuit board 5 and a speaker (not shown) are provided inside the musical instrument case 1 located behind the keyboard 4 (right side in FIG. 1). . The keyboard unit 4 includes a plurality of keys 6 made of synthetic resin. As shown in FIG. 1, the plurality of keys 6 have a white key 7 and a black key 8 and are arranged in parallel on the keyboard chassis 2 so as to be rotatable in the vertical direction.

  In this case, among the plurality of keys 6, as shown in FIG. 1, each of the plurality of white keys 7 has a thin bent portion 7a that bends and deforms in the vertical direction at each rear end portion (right end portion in FIG. 1). The thin bent portion 7a is formed and connected to the common support portion 7b that is continuous in the arrangement direction of the keys 6 (in the front and back direction of the paper surface in FIG. 1), thereby being connected to the common support portion 7b. The keys 6 are arranged in parallel along the arrangement direction of the keys 6 so as to be displaced in the vertical direction by the bent portions 7a.

  Further, as shown in FIG. 1, each of the plurality of black keys 8 is formed with a thin bent portion 8a which is bent and deformed in the vertical direction at each rear end portion (right end portion in FIG. 1). 8a is connected to a common support portion 8b that is continuous in the direction in which the keys 6 are arranged (in FIG. 1, the front and back surfaces of the paper), so that each bent portion 8a connected to the common support portion 8b can move up and down Are arranged in parallel along the arrangement direction of the keys 6.

  Thereby, as shown in FIG. 1, a plurality of black keys 8 are arranged between each of the plurality of white keys 7 so that the common support portion 7 b of the white key 7 and the black key 8 are shared. In this state, the common support portions 7b and 8b are attached to the keyboard chassis 2 with a plurality of screws 9, so that each white key 7 rotates in the vertical direction around the bent portion 7a. At the same time, each black key 8 is configured to rotate in the vertical direction around the bent portion 8a.

  On the other hand, as shown in FIG. 1, the keyboard chassis 2 also serves as a lower case of the musical instrument case 1 and is made of synthetic resin. A front cover portion 10 corresponding to the front end surface of the key 6 is formed on the front end portion (left end portion in FIG. 1) of the keyboard chassis 2 so as to protrude upward from the bottom portion. A key guide portion 11 (described later) for guiding the white key 7 in the vertical direction protrudes upward at a location on the keyboard chassis 2 located on the rear side (right side in FIG. 1) of the front cover portion 10. Yes.

  A key position restricting portion 12 for restricting the vertical position of each key 6 is formed at a position on the rear side (right side in FIG. 1) of the key guide portion 11 for the white key in the keyboard chassis 2. . The key position restricting portion 12 extends obliquely upward from the rear lower portion (lower right portion in FIG. 1) of the key guide portion 11, and extends rearward (right side in FIG. 1) from the upper end portion extending obliquely upward. The structure extends horizontally, is suspended from the extended rear end (right end in FIG. 1), and further extends horizontally from the suspended lower end to the rear (right side in FIG. 1). Is formed in an approximately chevron shape.

  In this case, as shown in FIG. 1, an opening 12 a is formed in the suspended portion of the key position restricting portion 12. An upper limit stopper portion 12b is provided on the lower surface of the horizontal portion located on the front side (left side in FIG. 1) in the upper portion of the opening 12a. Further, a lower limit stopper portion 12c is provided on the upper surface of a horizontal portion located on the rear side (right side in FIG. 1) in the lower portion of the opening 12a.

  Thereby, as shown in FIG. 1, the key position restricting portion 12 is moved from the lower side to the front side (in FIG. 1) of the key protruding portion 13 formed to protrude downward from each key 6 of the white key 7 and the black key 8. The hook portion 13a protruding toward the left side is inserted into the opening portion 12a so as to be movable in the vertical direction. When the key 6 is depressed in this state, the hook portion 13a of the key projection portion 13 is opened. The key 6 is constrained to the lower limit position by moving downward within the 12a and coming into contact with the lower limit stopper portion 12c from above.

  Further, as shown in FIG. 1, when the key 6 that has been depressed is returned to the initial position (the state shown in FIG. 1), the key position restricting portion 12 has the hook portion 13a of the key protruding portion 13 as an opening portion. The key 6 is configured to be restricted to the upper limit position, which is the initial position, by moving upward in 12a and coming into contact with the upper limit stopper portion 12b from below.

  As shown in FIG. 1, as in the case of the white key 7, the black key 8 is guided in the vertical direction at a position of the keyboard chassis 2 located at the rear portion (right side in FIG. 1) of the key position restricting portion 12. The key guide portion 11 is formed so as to protrude upward. A board mounting portion 15 for mounting the switch board 14 is formed at a position of the keyboard chassis 2 positioned on the rear side of the black key key guide section 11. In this case, the switch substrate 14 is formed in a band plate shape that is continuous along the arrangement direction of the plurality of keys 6.

  On the switch board 14, as shown in FIG. 1, a plurality of switch sections 16 are provided corresponding to the respective keys 6. The plurality of switch portions 16 include rubber sheets 16 a that are arranged on the switch substrate 14 and are continuous along the arrangement direction of the keys 6. The rubber sheet 16 a is provided with a dome-shaped bulging portion 16 b corresponding to each key 6. In the dome-shaped bulging portion 16b, movable contacts (not shown) are provided corresponding to the respective fixed contacts (not shown) provided on the switch board 14 in a state where they can be contacted and separated. Yes.

  As a result, when the dome-shaped bulged portion 16b is pressed from above by the switch pressing portions 17 respectively formed on the keys 6, the pressed bulged portion 16b is elastically deformed, and the switch portion 16 When the movable contact provided inside contacts the fixed contact on the switch substrate 14, a switch signal corresponding to the key 6 that has been pressed is output.

  Further, as shown in FIG. 1, a key support portion 18 is formed projecting upward from the bottom portion at a location of the keyboard chassis 2 located on the rear side of the board mounting portion 15 on which the switch portion 16 is mounted. ing. As shown in FIG. 1, the key support unit 18 includes a plurality of black keys 8 arranged between a plurality of white keys 7 in a plurality of keys 6, and the common support unit 7 b of the white key 7 and the black key 8. The common support portions 8b are overlapped with each other, and the common support portions 7b and 8b are attached by a plurality of screws 9 in this state.

  Further, as shown in FIG. 1, the upper case 3 covers the rear portion of the keyboard portion 4 (right side portion in FIG. 1), that is, the bent portions 7a and 8a and the common support portions 7b and 8b of each key 6 to cover the keyboard chassis 2. It is attached to the upper rear side. That is, the upper case 3 is provided with a mounting boss 3a on the inner surface thereof, and the mounting boss 3a is erected on a support boss 2a provided upright on the bottom located at the rear portion of the keyboard chassis 2 by screws (not shown). By being attached, it is attached to the rear upper part of the keyboard chassis 2. A circuit board 5 is attached to the inner surface of the upper case 3.

  By the way, as shown in FIGS. 1 and 2, the plurality of key guide portions 11 for guiding the plurality of keys 6 in the vertical direction are substantially flat as a whole, and are integrally formed in a standing state on the keyboard chassis 2. Is formed. That is, as shown in FIG. 2, the key guide portion 11 has a length (width L) in the arrangement direction of the keys 6 (left and right direction in FIG. 2) that is longer than the length between the insides of the keys 6 in the same direction. Is also formed slightly shorter.

  As shown in FIGS. 2 to 4, the key guide portion 11 has a load applying member 20 that applies a load due to frictional resistance when the key 6 is pressed. Are provided. The load applying member 20 is made of a synthetic resin such as polypropylene, and includes a base portion 21 provided in the key guide portion 11, a columnar support portion 22 provided in the base portion 21, and the support portion 22. And a pair of friction deformation portions 23.

  As shown in FIG. 2, the base portion 21 is formed integrally with the key guide portion 11 in an upright state. The columnar support portion 22 is integrally formed so as to stand on the center portion of the base portion 21 and to be inserted into the key 6. As shown in FIGS. 2 to 4, the pair of friction deformation portions 23 are elastically deformed according to the frictional resistance generated between the key 6 and the key 6 when the key 6 is pressed, A load caused by the frictional resistance accompanying this elastic deformation is applied to the key 6.

  That is, as shown in FIG. 2, the frictional deformation portion 23 is provided on the upper and lower portions of the support portion 22 in a state of extending obliquely upward via the first and second bent portions 24a and 25a. The first and second arm portions 24 and 25, and the friction arms stretched up and down on the respective distal ends of the first and second arm portions 24 and 25 via the third bent portions 26a Part 26.

  As shown in FIG. 2, the first arm portion 24 extends in a diagonally upward direction from the upper end portion of the support portion 22 toward the inner surface 6a of the key 6, and supports the first arm portion 24 via the first bent portion 24a. 22 is formed integrally. The second arm portion 25 is integrally formed with the support portion 22 via the second bent portion 25a in a state of extending obliquely upward from the lower end portion of the support portion 22 toward the inner surface 6a of the key 6. Yes.

  In this case, as shown in FIG. 2, the second arm portion 25 has the same length as the first arm portion 24 and is formed in parallel with the first arm portion 24. Each of the first and second bent portions 24a and 25a is a resin hinge portion formed in a thin thin wall portion. As shown in FIGS. The first and second arm portions 24 and 25 are configured to be rotationally displaced in the vertical direction.

  Further, as shown in FIG. 2, the friction arm portion 26 has an upper portion formed integrally with a distal end portion of the first arm portion 24 via a third bent portion 26a, and a lower portion formed with a third bending portion 26a. By being formed integrally with the distal end portion of the second arm portion 25 via the bent portion 26a, the key 6 is stretched in the vertical direction in a state parallel to the inner side surface 6a.

  As shown in FIGS. 2 to 4, the friction arm portion 26 contacts the inner side surface 6 a of the key 6 when the key 6 is pressed, so that the key 6 is pressed. A frictional resistance is generated between the inner surface 6a and the inner surface 6a. Each of the third bent portions 26a is also a resin hinge portion formed in a thin thin portion, and as shown in FIGS. The key 6 is configured to be displaced in the vertical direction along the inner surface 6a.

  As a result, as shown in FIG. 2, the frictional deformation portion 23 is formed in a link shape that forms a parallelogram as a whole, and is formed in a line-symmetric state on the left and right sides of the support portion 22 as a center. Yes. For this reason, as shown in FIGS. 2 to 4, the frictional deforming portion 23 comes into contact with the inner surface 6 a of the key 6 so that the frictional arm portion 26 can contact and separate when the key 6 is depressed. By sliding while sliding, a frictional resistance is generated between the inner side surface 6a of the key 6 that has been pressed.

  As shown in FIGS. 2 to 4, the frictional deformation portion 23 has a frictional resistance when the key 6 is depressed and a frictional resistance is generated between the key 6 and the inner surface 6 a. The first and second arm portions 24 and 25 are rotationally displaced downward about the first and second bent portions 24a and 25a, respectively, and the first and second arm portions 24 and 25 rotate. When the friction arm portion 26 is pressed against the inner surface 6a of the key 6 in accordance with the displacement, the frictional resistance is increased.

  On the other hand, as shown in FIGS. 2 to 4, the load applying member 20 is a pair that regulates the elastic deformation state when the key 6 is pressed and the pair of friction deformation portions 23 are elastically deformed. The deformation restricting portion 27 is provided. The pair of deformation restricting portions 27 are provided on the upper portion of the base portion 21 located on both sides of the support portion 22 so as to be gently inclined obliquely upward toward the inner surface 6 a of the key 6.

  Thereby, as shown in FIG. 3, when the key 6 is pressed, and the second arm portion 25 of the friction deformation portion 23 is rotationally displaced downward, the deformation restricting portion 27 is moved to the second arm. The portion 25 abuts from above to restrict the rotational displacement of the first and second arm portions 24, 25 to the lower side, thereby restricting elastic deformation of the friction deformation portion 23. It is configured so that the frictional resistance due to is maximized.

  By the way, as shown in FIG. 2 to FIG. 4, when the pressing operation of the key 6 that has been pressed is completed, the load applied by the load applying member 20 to each key 6 is released. A plurality of load application release units 29 are provided. The load application release portion 29 is a step recess 29a for separating the frictional deformation portion 23 of the load application member 20 from the inner side surface 6a of the key 2 when the pressing operation of the key 6 that has been pressed is completed. .

  That is, as shown in FIG. 3 and FIG. 4, the step recess 29 a of the load application release portion 29 is elastically deformed by the key 6 being pushed down and the friction deformation portion 23 of the load application member 20 is elastically deformed. When the portion 23 is restricted by the deformation restricting portion 27 and the frictional resistance becomes maximum, the inner side surface 6a of the key 6 is moved away from the inner side surface 6a of the key 2 so that the friction arm portion 26 of the friction deforming portion 23 is separated from the inner surface 6a. The key 6 is thinned to reduce the wall thickness.

  In this case, as shown in FIG. 3, the step recess 29 a of the load application release unit 29 has a maximum frictional resistance because the key 6 is pushed down and the friction deformation part 23 of the load application member 20 is regulated by the deformation regulation unit 27. In this state, the key 6 is further pushed down, and as shown in FIG. 4, when the pushing-down operation is completed, the lower end portion of the friction arm portion 26 of the friction deformation portion 23 corresponds to the position of the corresponding inner surface 6 a of the key 6. The thickness of the key 6 is reduced from the upper end of the inner surface 6a of the key 6 to the upper end.

  Also, a viscous lubricant 28 is provided between the load applying member 20 and the inner side surface 6a of the key 6 as shown in FIGS. The lubricant 28 is viscous liquid or gel (jelly), has an optimum viscosity suitable for a key touch feeling when a key is pressed, and the friction deformation portion 23 of the load applying member 20. Is applied between the friction arm portion 26 and the inner side surface 6a of the key 6 (that is, the inner side surface 6a of the key 6 includes the step recess 29a of the load application release portion 29).

  As shown in FIGS. 2 and 3, the lubricant 28 is frictionally deformed by the viscosity of the lubricant 28 that moves downward together with the inner surface 6 a of the key 6 when the key 6 is depressed and depressed. By rotating and displacing the first and second arm portions 24 and 25 downward while pulling down the friction arm portion 26 of the portion 23, the friction arm portion 26 is brought into contact with the inner side surface 6a of the key 6 to reduce the friction resistance. It is configured to generate. Further, as shown in FIG. 3, the lubricant 28 is applied to the friction arm portion 26 when the key 6 is pressed and the second arm portion 25 of the friction deformation portion 23 comes into contact with the deformation restriction portion 27. And the inner surface 6a of the key 6 are configured to slide relative to each other.

  Further, as shown in FIG. 4, the lubricant 28 is used when the key pressing operation of the key 6 is completed, that is, when the key 6 is restricted to the lower limit position by the lower limit stopper portion 12c. Is generated between the friction arm portion 26 of the friction deformation portion 23 and the inner side surface 6a of the key 6 by facing the step recess 29a of the load application release portion 29 of the key 6 and away from the inner side surface 6a of the key 6. The frictional resistance is released, and the frictional deformation portion 23 is returned to the original state shown in FIG.

Next, a case where the load applying member 20 is molded with a molding die in such a keyboard instrument will be described.
This forming method includes two methods. One method is a method in which the load applying member 20 is formed integrally with the same material as the keyboard chassis 2 at the same time, and the other method is the load applying member 20 and the keyboard chassis 2. Is a two-color molding method using different materials.

  In the former method, a cavity (for forming the load applying member 20 using a slide core in a molding die composed of an upper die and a lower die for molding the keyboard chassis 2 in advance) Cavity) is formed. Then, a synthetic resin such as polypropylene is injected into the molding die. Thereafter, when releasing the molding die, the slide core is pulled out from the molding die. Thereby, the load application member 20 is simultaneously molded with the same material as the keyboard chassis 2.

  In the latter method, the keyboard chassis 2 is molded in advance with a primary molding die composed of an upper die and a lower die using a synthetic resin different from that of the load applying member 20. The load applying member 20 is formed by placing the keyboard chassis 2 formed by the primary forming mold in a secondary forming mold including an upper mold and a lower mold.

  At this time, a cavity (cavity) for forming the load applying member 20 is formed in the secondary molding die using the slide core. A synthetic resin such as polypropylene is injected into the secondary mold. Thereafter, when the secondary molding die is released, the slide core is pulled out from the secondary molding die. As a result, the load applying member 20 is molded in two colors with a material different from that of the keyboard chassis 2.

  Further, when the key 6 is molded with a molding die, a load application releasing unit is formed using a slide core in a molding die composed of an upper die and a lower die for molding the key 6. A cavity (cavity) for forming the 29 stepped recesses 29a is formed. When a synthetic resin such as polypropylene is injected into the molding die and the molding die is released, the slide core is pulled out from the molding die to form the load application release portion 29. A key 6 is formed.

Next, a description will be given of the case where a plurality of keys 6 are depressed and played with such a keyboard instrument.
In FIG. 1, when a white key 7 is pressed among a plurality of keys 6, the white key 7 rotates counterclockwise around the bent portion 7a. When the black key 8 among the plurality of keys 6 is pressed, the black key 8 rotates counterclockwise around the bent portion 8a. When the key 6 is depressed in this way and rotated counterclockwise in FIG. 1, the switch pressing portion 17 of the key 6 presses the switch portion 16 on the switch substrate 14, and the pressed switch portion 16 is switched to the switch. Output a signal. Thereby, a musical sound is pronounced.

  Thus, when the key 6 is pressed and rotated counterclockwise in FIG. 1, the pair of frictional deformation portions 23 of the load applying member 20 are elastically deformed as shown in FIG. Load. That is, when the key 6 is depressed by being depressed, the friction arm portion 26 of the friction deformation portion 23 is pulled down by the viscosity of the lubricant 28 that moves downward together with the inner surface 6 a of the key 6. The second arm portions 24 and 25 are rotationally displaced downward.

  As a result, as shown in FIG. 3, the friction arm portion 26 is pressed against the inner side surface 6a of the key 6. Therefore, a frictional resistance is generated between the friction deforming portion 23 and the inner side surface 6a of the key 6, and this frictional resistance is generated. As a result, a load is applied to the key 6 and the key load increases. At this time, as shown by a curve A in FIG. 5, the load of the key 6 increases rapidly, and the key touch becomes heavy.

  When the key 6 is further pushed down and the first and second arm portions 24 and 25 of the friction deformation portion 23 are rotationally displaced downward together with the inner surface 6a of the key 6, as shown in FIG. The two arm portions 25 come into contact with the deformation restricting portion 27 from above, and the elastic deformation of the friction deforming portion 23 is restricted, and the frictional resistance is maximized. When the key 6 is further pushed down in this state, the friction arm portion 26 faces the stepped recess 29a of the load application release portion 29 of the key 6 and the friction arm portion 26 faces the inner surface of the key 2 as shown in FIG. Leave 6a.

  For this reason, since the frictional resistance of the friction arm portion 26 against the key 6 is rapidly reduced, the key load of the key 6 is drastically reduced, and a key touch feeling that the key load is released is obtained. That is, as indicated by a curve A in FIG. 5, the key load increases rapidly as the key 6 is pushed down, but the key 6 is further pushed down and the entire friction arm portion 26 applies the load on the key 6. When facing the stepped recess 29a of the release portion 29, as shown by the curve B in FIG. A key touch feeling that removes the load occurs.

  Thereafter, the hook portion 13a of the key projection 13 provided on the key 6 comes into contact with the lower limit stopper portion 12c of the keyboard chassis 2, so that the load on the key 6 increases rapidly again as shown by a curve C in FIG. However, the key touch becomes heavier. Thereafter, the key 2 returns to the initial position by the elastic return force of the bulging portion 16b of the switch portion 16 and the elastic return force of the bent portions 7a and 8a of the key 6 shown in FIG.

  At this time, as shown in FIG. 4, the friction arm portion 26 of the friction deformation portion 23 faces the stepped recess portion 29 a of the load application release portion 29 of the key 6, and the frictional resistance by the friction arm portion 26 against the inner side surface 6 a of the key 6. Is released, the friction arm portion 26 is quickly elastically restored by the elastic return force of each of the first to third bent portions 24 a, 25 a, 26 a and is separated from the inner surface 6 a of the key 6. As a result, the key 6 rotates smoothly and smoothly upward, and the load on the key 6 rapidly decreases as indicated by the curve D in FIG.

  Then, when the keyboard 6 is further rotated upward and the friction arm portion 26 of the friction deformation portion 23 is relatively displaced downward from the step recess 29 a of the load application release portion 29 of the key 6, Since the friction arm portion 26 approaches the inner surface 6a of the key 6, a little frictional resistance is generated by the friction arm portion 26, and the load on the key 6 becomes slightly heavier as shown by a curve E in FIG.

  However, at this time, the first and second arm portions 24 and 25 of the load applying member 20 are rotationally displaced upward about the first and second bent portions 24a and 25a. The frictional resistance due to the switch 26 does not increase, and the key 6 rotates smoothly and smoothly upward by the elastic return force of the bulging portion 16b of the switch portion 16 and the elastic return force of the bent portions 7a and 8a of the key 6. . For this reason, as indicated by a curve F in FIG. 5, the load of the key 6 gradually decreases and returns to the initial key load, and the key 6 is quickly returned to the initial position.

  At this time, as shown in FIG. 1, the switch portion 16 pushes up the switch pressing portion 17 to return to the initial state, and the movable contact in the bulging portion 16 b of the switch portion 16 is separated upward from the fixed contact of the switch substrate 14. The switch unit 16 is turned off, and the sound production is stopped. Thereafter, the hook portion 13a of the key projection portion 13 provided on the key 6 comes into contact with the upper limit stopper portion 12b of the keyboard chassis 2 so that the key 6 is regulated at the initial position and is prepared for the next key pressing.

  As described above, according to this keyboard instrument, the plurality of key guide portions 11 provided on the keyboard chassis 2 for guiding the plurality of keys 6 in the vertical direction, respectively, and the plurality of key guide portions 11 are provided. When a plurality of keys 6 are pressed, a plurality of load applying members 20 that respectively apply loads due to frictional resistance to the keys 6 that have been pressed, and a plurality of keys 6 are provided. When the operated operation of pushing down the key 6 is completed, a plurality of load application release portions 29 for releasing the load applied to the key 6 by the load application member 20 are provided, so that a hammer member is not used. In addition, it is possible to obtain a key touch feeling similar to that of an acoustic piano during a key pressing operation.

  That is, in this keyboard instrument, when the key 6 is pressed, the load applying member 20 applies a load due to frictional resistance to the key 6 that has been pressed, so that the key load can be increased. At the same time, when the key pressing operation of the key 6 is finished, the frictional resistance due to the load applying member 20 is released by the load applying release unit 29, so that the key load is rapidly reduced to obtain a key touch feeling that the key load is released. As a result, the key 6 can be quickly returned to the initial position to prepare for the next key depression, so that the performance can be improved.

  For this reason, in this keyboard musical instrument, it is possible to apply a load to the key 6 during the key pressing operation without using a hammer member as in the conventional example, and to make the key touch surely heavy, and the load application releasing unit 29 As a result, the key load can be drastically reduced to obtain a key touch feeling that allows the key load to be removed, so that a key touch feeling similar to an acoustic piano can be obtained. In addition, in this keyboard instrument, it is not necessary to use a heavy hammer member as in the conventional example, so the weight of the entire instrument can be greatly reduced, and thus the keyboard instrument can be carried easily, A low-priced product can be provided.

  In this case, the load applying member 20 includes a support portion 22 provided in the key guide portion 11 and a key 6 that is provided on the support portion 22 and is pressed when the key 6 is pressed. The key 6 is depressed by being provided with a pair of friction deformation portions 23 that elastically deform according to the frictional resistance generated between them and apply a load due to the frictional resistance accompanying the elastic deformation to the key 6. Then, a frictional resistance can be generated between the key 6 and the pair of frictional deformation parts 23, and the pair of frictional deformation parts 23 can be elastically deformed by the frictional resistance. Since the frictional resistance can be increased, the key load can be increased reliably and rapidly.

  Further, the support portion 22 is provided in the key guide portion 11 in a state of being inserted into the key 6 from the lower side, and the friction deformation portion 23 is provided on the upper and lower portions of the support portion 22 in the first and second portions. The first and second arm portions 24 and 25 provided in a state of extending obliquely upward via the bent portions 24a and 25a, and the tips of the first and second arm portions 24 and 25, respectively. Each of which is provided with a friction arm portion 26 that is stretched up and down via a third bent portion 26a and slidably contacts and slides on the inner surface 6a of the key 6. Can be pressed against the inner side surface 6a of the key 6 by the first and second arm portions 24 and 25, and the load caused by the pressing is applied to the key 6 when the key is pressed down. It can be surely given.

  That is, when the key 6 is depressed and depressed, a frictional resistance is generated between the inner surface 6a of the key 6 and the friction arm portion 26, and the first and second bent portions are generated by this frictional resistance. The first and second arm portions 24 and 25 can be rotationally displaced while the 24 a and 25 a are bent, and the friction arm portion 26 can be reliably pressed against the inner surface 6 a of the key 6. For this reason, since the rotational displacement of the first and second arm portions 24 and 25 gradually increases as the key 6 is depressed, the friction generated between the inner surface 6a of the key 6 and the friction arm portion 26 is increased. The resistance can be increased rapidly, thereby increasing the key load quickly.

  The load applying member 20 includes a deformation restricting portion 27 that restricts the elastic deformation state when the key 6 is depressed and the pair of friction deforming portions 23 are elastically deformed. When the first and second arm portions 24 and 25 of the friction deformation portion 23 are rotationally displaced downward by the key operation, the second arm portion 25 comes into contact with the deformation restriction portion 27 and the friction deformation portion 23. It is possible to regulate the elastic deformation of. For this reason, even if the key 6 is pushed down and the frictional resistance generated between the inner surface 6a of the key 6 and the friction arm portion 26 increases, the frictional resistance can be suppressed from increasing beyond a certain level. .

  Further, in this keyboard instrument, the load application release unit 29 is provided with a step recess 29a for separating the load application member 20 from the inner side surface 6a of the key 6 when the pressing operation of the key 6 that has been pressed is completed. Therefore, the load applying member 20 corresponds to the step recess 29a of the load applying release portion 29 when the operation of pushing down the key 6 that has been pressed is completed with a simple structure that only reduces the thickness of the key 6. As a result, the load applying member 20 can be separated from the inner side surface 6a of the key 6. Therefore, the load applied to the key 6 by the load applying member 20 can be reliably and quickly released.

  In this case, when the key 6 is depressed, the load application release unit 29 increases the frictional resistance generated between the inner side surface 6a of the key 6 and the friction arm unit 26, and the load application member 20 with respect to the key 6 increases. When the frictional resistance is maximized, the load applying member 20 is separated from the inner side surface 6a of the key 6, so that a key touch feeling can be obtained in which the key load is suddenly reduced and the key load is released. As a result, it is possible to obtain a key touch feeling similar to that of an acoustic piano, and to quickly return the elastically deformed portion 23 of the load applying member 20 to the original shape, thereby returning the key 6 to the initial position. Recovery can be facilitated.

  Further, a viscous lubricant 28 is provided between the inner surface 6a of the key 6 and the load applying member 20, so that when the key 6 is depressed by being depressed, Due to the viscosity of the lubricant 28 that moves downward together with the side surface 6a, the first and second arm portions 24 and 25 can be rotationally displaced downward while lowering the friction arm portion 26 of the friction deformation portion 23, As a result, the friction arm 26 can be brought into contact with the inner side surface 6a of the key 6 to surely generate a frictional resistance, and when the operation of pushing down the key 6 is completed, the load applied by the load applying member 20 to the key 6 is terminated. It can be released reliably.

  Thus, according to this keyboard instrument, when the key 6 is depressed and the second arm portion 25 of the friction deformation portion 23 comes into contact with the deformation restriction portion 27, the friction arm portion 26 is applied by the lubricant 28. And the inner surface 6a of the key 6 can be slid relative to each other, and when the key pressing operation of the key 6 is completed, the frictional deformation portion 23 is caused by the step recess 29a of the load application release portion 29. Since the friction arm portion 26 and the inner side surface 6a of the key 6 are separated via the lubricant 28, the frictional resistance by the friction deformation portion 23 can be released. As a result, the friction deforming portion 23 can be easily returned to the original shape, so that the key 6 can be quickly and satisfactorily returned to the initial position without being substantially affected by the frictional resistance.

  Further, in this keyboard instrument, the key guide portion 11 is formed integrally with the keyboard chassis 2, and the plurality of load applying members 20 are formed integrally with the key guide portion 11, respectively. Since 29 is integrally formed with each of the plurality of keys 6, productivity can be improved even if each of the plurality of keys 6 includes the load application member 20 and the load application release unit 29.

  That is, even if each of the plurality of keys 6 includes the load application member 20 and the load application release unit 29, the plurality of load application members 20 are connected to the plurality of key guide units 11 and the keyboard by the molding die for forming the keyboard chassis 2. It can be molded together with the chassis 2, and a plurality of load application release portions 29 can be molded together with the plurality of keys 6 by a molding die for molding the key 6. For this reason, the productivity is good and the number of parts can be greatly reduced compared to the case of using a hammer member as in the conventional example, thereby improving the assembly workability and reducing the cost. Can also be achieved.

(Embodiment 2)
Next, a second embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as Embodiment 1 shown by FIGS.
As shown in FIG. 6, the keyboard instrument includes a load applying member 30 that applies a load to the key 6 when the key 6 is pressed, and when the pressing operation of the key 6 that has been pressed is completed. The load application cancellation unit 36 that cancels the application of the load by the load application member 30 to the key 6 has a configuration different from that of the first embodiment, and the other configuration is substantially the same as that of the first embodiment.

  As in the first embodiment, the load applying member 30 is made of a synthetic resin such as polypropylene. As shown in FIG. 6, the pair of base portions 31 provided on the key guide portion 11 and the pair of base portions 31 are provided. A pair of support portions 32 provided respectively, and a pair of friction deformation portions 33 provided respectively on the pair of support portions 32 are provided. As in the first embodiment, the pair of base portions 31 are integrally formed in an upright state on the upper portion of the key guide portion 11.

  The pair of support portions 32 are integrally formed in a state in which the pair of support portions 32 are erected at the respective end portions approaching the inner side surface 6 a of the key 6 on the pair of base portions 31 and inserted into the key 6. As in the first embodiment, the pair of friction deformation portions 33 elastically deform according to the frictional resistance generated between the key 6 and the key 6 that has been pressed when the key 6 is pressed, and this elastic deformation The accompanying load is applied to the key 6. In this case, a columnar friction projection 34 is suspended from the center of the key 6 at a location corresponding to the load applying member 30.

  As shown in FIG. 6, the frictional deformation portion 33 of the load applying member 30 is formed on the upper and lower portions of the pair of support portions 32 via the first and second bent portions 24 a and 25 a, and the friction projection portion 34 of the key 6. The first and second arm portions 24 and 25 provided in a state of extending obliquely upward toward the upper end, and third bent portions at the distal ends of the first and second arm portions 24 and 25, respectively. And a friction arm portion 26 stretched up and down via a portion 26a.

  As shown in FIG. 6, the first arm portion 24 extends the first bent portion 24 a obliquely upward from the upper ends of the pair of support portions 32 toward the friction projection 34 of the key 6. Are formed integrally with the pair of support portions 32. The second arm portion 25 extends obliquely upward from the lower end portion of the pair of support portions 32 toward the friction projection portion 34 of the key 6 and is connected to the pair of support portions 32 via the second bent portion 25a. Each is integrally formed.

  Also in this case, the second arm portion 25 is formed in the same length as the first arm portion 24 and in parallel with the first arm portion 24 as shown in FIG. The first and second bent portions 24a and 25a are resin hinge portions formed in thin thin portions as in the first embodiment. As shown in FIGS. By being deformed, the first and second arm portions 24 and 25 are configured to be rotationally displaced in the vertical direction.

  Further, as shown in FIG. 6, the friction arm portion 26 has an upper portion formed integrally with the distal end portion of the first arm portion 24 via a third bent portion 26a, and a lower portion of the third arm portion. By being formed integrally with the distal end portion of the second arm portion 25 via the bent portion 26a, the second arm portion 25 is stretched in the vertical direction in a state parallel to the friction projection portion 34 of the key 6.

  As shown in FIGS. 6 to 8, when the key 6 is pressed, the friction arm portion 26 comes into contact with and slides on the friction projection 34 of the key 6 in a state where the friction arm portion 26 can be contacted and separated. A frictional resistance is generated between the key 6 and the friction projection 34 of the key 6 that has been pressed. Each of the third bent portions 26a is also a resin hinge portion formed in a thin wall portion, and as shown in FIGS. The key 6 is configured to be displaced in the vertical direction along the friction projection 34.

  Accordingly, as shown in FIG. 6, the frictional deformation portion 33 is formed in a link shape that forms a parallelogram as a whole, and is line-symmetrical with the pair of support portions 32 around the friction protrusion 34 of the key 6. It is formed in the state. For this reason, as shown in FIGS. 6 to 8, the friction deforming portion 33 is configured so that the friction arm portion 26 contacts and separates from both side surfaces 34 a of the friction projection portion 34 of the key 6 when the key 6 is depressed. By sliding while contacting in a possible state, a frictional resistance is generated between the key 6 and the friction projection 34 of the key 6 that has been pressed.

  Further, as shown in FIGS. 6 and 7, when the key 6 is depressed and a frictional resistance is generated between the frictional deformation part 33 and the frictional projection 34 of the key 6, as shown in FIGS. The first and second arm portions 24 and 25 are rotationally displaced downward about the first and second bent portions 24a and 25a, respectively, and the first and second arm portions 24 and 25 The frictional arm 26 is pressed against the friction projection 34 of the key 6 in accordance with the rotational displacement, so that the frictional resistance is increased.

  On the other hand, also in this load application member 30, as shown in FIGS. 6 to 8, when the key 6 is pressed and the pair of friction deformation portions 33 are elastically deformed, a pair of elastic deformation states are regulated. A deformation restricting portion 35 is provided. The pair of deformation restricting portions 35 are provided on the upper portions of the base portions 31 located between the pair of support portions 32 so as to be inclined gently and obliquely upward toward the friction projections 34, respectively. Similarly to the first embodiment, the deformation restricting portion 35 is also operated when the key 6 is depressed and the first and second arm portions 24 and 25 of the friction deforming portion 33 are rotationally displaced downward. The arm portion 25 is configured to abut against the elastic deformation of the friction deformation portion 33 by abutting from above.

  Further, as shown in FIGS. 6 to 8, when the pressing operation of the key 6 that has been pressed is completed, the load application by the load applying member 30 is released to the plurality of keys 6. A load imparting release unit 36 is provided. The load application release unit 36 is configured to separate the frictional deformation part 33 of the load application member 30 from the both side surfaces 34a of the friction projection part 34 of the key 2 when the pressing operation of the key 6 that has been pressed is completed. A step recess 36a.

  That is, as shown in FIGS. 7 and 8, the step recess 36 a of the load application release unit 36 is elastically deformed by the key 6 being pushed down and the frictional deformation part 33 of the load application member 30 is elastically deformed. When the portion 33 is restricted by the deformation restricting portion 35 and the frictional resistance is maximized, the friction projections are used to separate the friction arm portions 26 of the friction deforming portion 33 from the both side surfaces 34a of the friction protrusions 34 of the key 2. The side surfaces 34a of the portion 34 are scraped to reduce the thickness of the friction projection 34.

  In this case, as shown in FIG. 7, the step recess 36 a of the load application release unit 36 has a maximum frictional resistance because the key 6 is pushed down and the friction deformation part 33 of the load application member 30 is regulated by the deformation regulation part 35. In this state, the key 6 is further pushed down, and as shown in FIG. 8, when the pushing-down operation is finished, the lower end portion of the friction arm portion 26 of the friction deformation portion 33 corresponds to the friction projection portion 34 of the key 6 corresponding thereto. The thickness of the friction projection 34 is reduced from the position of the both side surfaces 34a to the upper end of both sides 34a of the friction projection 34.

  Also, a viscous lubricant 28 is provided between the load applying member 30 and the friction projection 34 of the key 6 as in the first embodiment. The lubricant 28 is also in a viscous liquid or gel (jelly) form, has an optimum viscosity that matches the key touch feeling when the key is pressed, and the friction deforming portion 33 in the load applying member 30. It is applied between the friction arm portion 26 and the friction projection portion 34 of the key 6.

  As shown in FIG. 6, when the key 6 is depressed and depressed, the lubricant 28 is caused by the viscosity of the lubricant 28 that moves downward together with the friction projections 34 of the key 6, so that the friction deforming portion 33. The first and second arm portions 24 and 25 are rotationally displaced downward while pulling down the friction arm portion 26 to bring the friction arm portion 26 into contact with the friction projection portion 34 of the key 6 to generate a frictional resistance. It is configured to let you. Further, as shown in FIG. 7, the lubricant 28 is applied to the friction arm portion 26 when the key 6 is pressed and the second arm portion 25 of the friction deformation portion 33 contacts the deformation restriction portion 35. And the friction projection 34 of the key 6 are configured to slide while relatively sliding.

  Further, as shown in FIG. 8, the lubricant 28 has a friction arm portion 26 and a friction projection 34 of the key 6 when the key 6 is depressed and restricted to the lower limit position by the lower limit stopper portion 12 c. As a result of relative sliding, the entire friction arm portion 26 of the friction deformation portion 33 faces the stepped recess 36a of the load application release portion 36 on both side surfaces 34a of the friction projection portion 34 of the key 6, and the friction projection portion 34 By separating from both side surfaces 34a, the frictional resistance generated between the friction arm portion 26 of the friction deformation portion 33 and the friction projection portion 34 of the key 6 is released, and the friction deformation portion 33 is restored to the original shape shown in FIG. It is configured to return.

  In such a keyboard instrument, when the load applying member 30 is formed by a molding die, as in the first embodiment, a molding die composed of an upper die and a lower die, and a slide core are used. The plurality of key guide portions 11 and the keyboard chassis 2 can be formed integrally. Further, when the key 6 is molded with a molding die, the load application releasing portion 36 is formed using the molding die for molding the key 6 and the slide core, as in the first embodiment. A key 6 can be formed.

Next, the case of playing with this keyboard instrument will be described.
Also in this case, as in the first embodiment, a performance can be performed by pressing the key 6. That is, when the key 6 is pressed and rotated counterclockwise in FIG. 1, the switch pressing portion 17 of the key 6 presses the switch portion 16 on the switch substrate 14, and the pressed switch portion 16 is switched to the switch signal. Is output. Thereby, a musical sound is pronounced.

  When the key 6 is thus depressed and rotated counterclockwise in FIG. 1, the pair of friction deforming portions 33 of the load applying member 30 are elastically moved by the friction protrusions 34 of the key 6 as shown in FIG. 7. In this way, a load is applied to the key 6. That is, when the key 6 is depressed by being depressed, the friction arm portion 26 of the friction deformation portion 33 is pulled down by the viscosity of the lubricant 28 that moves downward together with the friction projection portion 34 of the key 6. The second arm portions 24 and 25 are rotationally displaced downward.

  As a result, as shown in FIG. 7, the friction arm 26 is pressed against both side surfaces 34 a of the friction projection 34 of the key 6, so that frictional resistance is generated between the friction deformation portion 33 and the friction projection 34 of the key 6. This is generated and a load is applied to the key 6 by this frictional resistance, and the key load becomes heavy. At this time, as shown by the curve A in FIG. 5, the load of the key 6 rapidly rises and the key touch becomes heavy.

  Then, when the key 6 is further pushed down and the first and second arm portions 24 and 25 of the friction deformation portion 33 are rotationally displaced downward together with the friction projection portion 34 of the key 6, as shown in FIG. The second arm portion 25 comes into contact with the deformation restricting portion 35 from above, the elastic deformation of the friction deforming portion 33 is restricted, and the frictional resistance is maximized. When the key 6 is further pushed down in this state, the friction arm portion 26 faces the stepped recess 36a of the load application release portion 36 of the key 6 as shown in FIG. Separate from both side surfaces 34a.

  For this reason, since the frictional resistance of the friction arm portion 26 against the key 6 is rapidly reduced, the key load of the key 6 is drastically reduced, and a key touch feeling that the key load is released is obtained. At this time, as indicated by a curve A in FIG. 5, the key load gradually increases as the key 6 is pushed down, but the key 6 is further pushed down so that the entire friction arm portion 26 is attached to the key 6. When facing the step recess 36a of the load application release portion 36, the frictional resistance by the friction arm portion 26 is extremely reduced as shown by the curve B in FIG. There is a key touch feeling that causes the key load to come off.

  Thereafter, the hook portion 13a of the key projection 13 provided on the key 6 comes into contact with the lower limit stopper portion 12c of the keyboard chassis 2, so that the load on the key 6 abruptly increases again as shown by the curve C in FIG. It rises and the key touch becomes heavier. Thereafter, the key 2 is returned to the initial position by the elastic return force of the bulging portion 16b of the switch portion 16 and the elastic return force of the bent portions 7a and 8a of the key 6 shown in FIG.

  At this time, as shown in FIG. 8, the friction arm portion 26 of the friction deformation portion 33 faces the stepped recess portion 36 a of the load application release portion 36 of the key 6, and the friction arm portion 26 applies to both side surfaces 34 a of the friction projection portion 34. Since the frictional resistance is released, the frictional deformation portion 33 is quickly elastically restored to the original shape by the elastic restoring force of the first to third bent portions 24a, 25a, and 26a. As a result, the key 6 rotates smoothly and smoothly upward, and the load on the key 6 rapidly decreases as shown by the curve D in FIG.

  Then, when the keyboard 6 is further rotated upward and the friction arm portion 26 of the friction deformation portion 33 is relatively displaced downward from the step recess 36 a of the load application release portion 36 of the key 6, the friction of the friction deformation portion 33. Since the arm part 26 approaches the both side surfaces 34a of the friction projection part 34, a little frictional resistance is generated by the friction arm part 26, and the load of the key 6 becomes slightly heavy as shown by the curve E in FIG.

  However, at this time, the first and second arm portions 24 and 25 of the load applying member 36 rotate upward about the first and second bent portions 24a and 25a. The frictional resistance due to is not increased, and the key 6 is smoothly and smoothly rotated upward by the elastic return force of the bulging portion 16b of the switch portion 16 and the elastic return force of the bent portions 7a and 8a of the key 6. For this reason, as indicated by a curve F in FIG. 5, the load of the key 6 returns to the initial key load, and the key 6 is quickly returned to the initial position.

  At this time, as in the first embodiment, the switch portion 16 pushes up the switch pressing portion 17 to return to the initial state, and the movable contact in the bulging portion 16b of the switch portion 16 is separated upward from the fixed contact of the switch substrate 14. The switch unit 16 is turned off and the tone generation is stopped. Thereafter, the hook portion 13a of the key projection portion 13 provided on the key 6 comes into contact with the upper limit stopper portion 12b of the keyboard chassis 2 so that the key 6 is regulated at the initial position and is prepared for the next key pressing.

  As described above, also in this keyboard instrument, the plurality of keys 6 are provided on the keyboard chassis 2 arranged in parallel with the plurality of keys 6 being rotatably mounted in the vertical direction, and the plurality of keys 6 are respectively guided in the vertical direction. Each of the plurality of key guide portions 11 and each of the plurality of key guide portions 11 is provided with a load caused by frictional resistance when the plurality of keys 6 are pressed. A plurality of load applying members 30, and a plurality of load applying release units 36 for releasing the application of the load by the load applying member 30 to the key 6 when the pressing operation of the key 6 that has been pressed is finished, As in the first embodiment, a key touch feeling similar to an acoustic piano can be obtained during a key pressing operation without using a hammer member.

  That is, also in this keyboard instrument, when the key 6 is pressed, the load applying member 30 applies a load due to frictional resistance to the key 6 that has been pressed, so that the key load can be increased. In addition, since the frictional resistance due to the load applying member 30 is released by the load applying release unit 36 after or near the end of the key pressing, it is possible to obtain a key touch feeling in which the key load is suddenly reduced and the key load is released. This makes it possible to quickly return the key 6 to the initial position and prepare for the next key depression, so that the performance can be improved.

  For this reason, even with such a keyboard instrument, similarly to the first embodiment, even if a hammer member as in the conventional example is not used, a load is applied to the key 6 during the key pressing operation, and the key touch is surely made heavy. In addition, it is possible to obtain a key touch feeling in which the key load is released by abruptly reducing the key load by the load applying release unit 36, so that a key touch feeling similar to an acoustic piano can be obtained. In addition, since it is not necessary to use a heavy hammer member as in the conventional example, the weight of the entire instrument can be greatly reduced, which makes it possible to carry a keyboard instrument easily and at a low price. Can be provided.

  In this case, the load applying member 30 is pressed when a key 6 is pressed by a pair of support portions 32 provided in the key guide portion 11 and provided in the pair of support portions 32, respectively. A pair of friction deformation portions 33 that elastically deform according to the frictional resistance generated between the key 6 and the friction projection 34 of the key 6 and apply a load accompanying the elastic deformation to the key 6, When the key 6 is depressed, a frictional resistance is generated between the friction projection 34 of the key 6 and the pair of frictional deformation parts 33, and the pair of frictional deformation parts 33 are elastically deformed by the frictional resistance. In addition, since the frictional resistance can be increased by the elastic deformation of the pair of frictional deformation portions 33, the key load can be reliably and rapidly increased.

  The pair of support portions 32 are provided in the key guide portion 11 in a state of being inserted into the inside of the key 6 from the lower side, and the frictional deformation portions 33 are first and lower on the upper and lower portions of the pair of support portions 32. First and second arm portions 24 and 25 provided in a state of extending obliquely upward through the second bent portions 24a and 25a, and the first and second arm portions 24, Friction arm portions 26 that are stretched up and down via respective third bent portions 26a and that are in contact with and slidable on both side surfaces 34a of the friction projections 34 of the key 6 in a state where they can be contacted and separated. Thus, as in the first embodiment, when the key 6 is depressed and depressed, the first and second arm portions 24 and 25 are used to connect the friction arm portion 26 to the friction projection portion of the key 6. 34 and can be pressed against both side surfaces 34a of the key 6. It is possible to reliably granted.

  That is, when the key 6 is depressed and depressed, a frictional resistance is generated between the both side surfaces 34a of the friction projection 34 of the key 6 and the friction arm 26, and the frictional resistance causes the first, first, The first and second arm portions 24 and 25 can be rotationally displaced while the two bent portions 24 a and 25 a are bent, and the friction arm portion 26 can be reliably pressed against the friction protrusion 34 of the key 6. For this reason, the rotational displacement of the first and second arm portions 24 and 25 gradually increases as the key 6 is pushed down, so that it is generated between the friction protrusion 34 and the friction arm portion 26 of the key 6. The frictional resistance can be increased rapidly, thereby increasing the key load quickly.

  The load applying member 30 includes the deformation restricting portion 35 that restricts the elastic deformation state when the key 6 is pressed and the pair of friction deforming portions 33 are elastically deformed. Similarly, when the key 6 is pressed and the first and second arm portions 24 and 25 of the friction deformation portion 33 are rotationally displaced downward, the second arm portion 25 contacts the deformation restriction portion 35. The elastic deformation of the frictional deformation portion 33 can be regulated by contact. For this reason, even if the key 6 is pushed down and the frictional resistance generated between the frictional projection 34 and the frictional arm 26 of the key 6 increases, the frictional resistance is prevented from increasing beyond a certain level. it can.

  Further, in this keyboard instrument, the load application release unit 36 separates the load application member 30 from the both side surfaces 34a of the friction projection 34 of the key 6 when the pressing operation of the key 6 that has been pressed is completed. Since the step recess 36a of the key 6 has a simple structure that only reduces the thickness of the friction projection 34 of the key 6 as in the first embodiment, when the pressing operation of the key 6 that has been pressed is completed, The load applying member 30 can be made to correspond to the stepped recess 36 a of the load applying release portion 36, whereby the load applying member 30 can be separated from the both side surfaces 34 a of the friction projection 34 of the key 6. The load by the load applying member 30 can be reliably and promptly released.

  In this case, when the key 6 is depressed, the load application release unit 36 increases the frictional resistance generated between the side surfaces 34 a of the friction projection 34 of the key 6 and the friction arm 26, so When the frictional resistance of the load applying member 30 reaches the maximum, the load applying member 30 is separated from the both side surfaces 34a of the friction projection 34 of the key 6, so that the key load is sharply reduced and the key load is released. A feeling can be obtained. Thereby, a key touch feeling similar to an acoustic piano can be obtained, and the frictional deformation portion 33 of the load applying member 30 can be quickly elastically restored to the original shape, thereby returning the key 6 to the initial position. Recovery can be facilitated.

  Further, since a viscous lubricant 28 is provided between the friction projection 34 of the key 6 and the load applying member 30, when the key 6 is depressed by being depressed, The first and second arm portions 24 and 25 can be rotationally displaced downward while lowering the friction arm portion 26 of the friction deformation portion 33 due to the viscosity of the lubricant 28 that moves downward together with the friction projection 34. Thus, the frictional arm 26 can be brought into contact with both side surfaces 34a of the friction projection 34 of the key 6 so that the frictional resistance can be surely generated, and the pressing operation of the key 6 that has been pressed is completed. In addition, the load applied to the key 6 by the load applying member 30 can be reliably released.

  Thus, according to this keyboard instrument, when the key 6 is depressed and the second arm portion 25 of the friction deformation portion 33 comes into contact with the deformation restriction portion 35, the friction arm portion 26 is applied by the lubricant 28. And the friction projection 34 of the key 6 can be slid relative to each other, and when the key pressing operation of the key 6 is finished, the frictional deformation portion is caused by the step recess 36a of the load application release portion 36. Since the friction arm portion 26 of the key 33 and both side surfaces 34a of the friction projection portion 34 of the key 6 are separated via the lubricant 28, the frictional resistance by the friction deformation portion 33 can be released. As a result, the friction deforming portion 33 can be easily returned to the original shape, so that the key 6 can be quickly and satisfactorily returned to the initial position without being substantially affected by the frictional resistance.

  Also in this keyboard instrument, a plurality of key guide portions 11 are also formed integrally with the keyboard chassis 2, and a plurality of load applying members 30 are formed integrally with the plurality of key guide portions 11, respectively. Are provided integrally with the friction projections 34 of the plurality of keys 6, so that each of the plurality of keys 6 includes the load application member 30 and the load application release unit 36. Productivity can be improved.

  That is, even if each of the plurality of keys 6 includes the load applying member 30 and the load applying release unit 36, the plurality of load applying members 30 are connected to the plurality of key guide portions 11 and the keyboard by the molding die for forming the keyboard chassis 2. It can be molded at the same time with the chassis 2, and a plurality of load application release portions 36 can be molded at a time together with the plurality of keys 6 by a molding die for molding the key 6. For this reason, as in the first embodiment, the productivity is good and the number of parts can be greatly reduced compared with the case of using a hammer member as in the conventional example, thereby improving the assembly workability. As well as cost reduction.

(Embodiment 3)
Next, a third embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS. Also in this case, the same parts as those in the first embodiment shown in FIGS.
As shown in FIG. 9, the keyboard instrument is different from the first embodiment in the friction deformation portion 41 of the load applying member 40 that applies a load to the key 6 when the key 6 is pressed. Has substantially the same configuration as that of the first embodiment.

  That is, the load applying member 40 is configured to directly contact the friction deformation portion 41 with the inner side surface 6 a of the key 6 without using the viscous lubricant 28. For this reason, the frictional deformation portion 41 of the load applying member 40 has a configuration in which a notch groove 52 is formed in each of the first and second arm portions 24 and 25 integrally formed on the upper and lower portions of the support portion 22. ing.

  In such a keyboard instrument, when the key 6 is pressed, the frictional deformation portion 51 of the load applying member 50 is elastically deformed as shown in FIG. 6 is given. That is, when the key 6 is depressed by being depressed, the first and second arm portions 24 and 25 are moved downward while the friction arm portion 26 of the friction deformation portion 41 is depressed by the inner side surface 6a of the key 6. To rotational displacement.

  As a result, as shown in FIG. 10, the friction arm portion 26 is pressed against the inner side surface 6a of the key 6. Therefore, a frictional resistance is generated between the friction deforming portion 41 and the inner side surface 6a of the key 6, and this frictional resistance is generated. As a result, a load is applied to the key 6 and the key load becomes heavy. When the key 6 is further pushed down and the first and second arm portions 24 and 25 of the friction deformation portion 41 are rotationally displaced downward, the second arm portion 25 is deformed as shown in FIG. The elastic deformation of the frictional deformation portion 41 is restricted by coming into contact with the restriction portion 27.

  That is, when the second arm portion 25 abuts against the deformation restricting portion 27, the first and second arm portions 24, 24 are provided by the notch grooves 42 provided in the first and second arm portions 24, 25, respectively. 25 is bent, thereby restricting elastic deformation of the frictional deformation portion 41. When the key 6 is further pushed down in this state, the first and second arm portions 25 are further bent, and the frictional resistance is maximized. Then, the friction arm portion 26 of the friction deformation portion 41 faces the stepped recess 29 a of the load application release portion 29 of the key 6, and the friction arm portion 26 moves away from the inner side surface 6 a of the key 2.

  For this reason, as in the first embodiment, the frictional resistance of the friction arm portion 26 with respect to the key 6 is rapidly reduced, so that the key load of the key 6 is drastically reduced and a key touch feeling that allows the key load to escape is obtained. At this time, as shown in FIG. 11, the frictional deformation portion 41 returns to its original shape. Thereby, since the friction deformation part 41 does not apply the load by frictional resistance with respect to the key 6, the elastic return force of the bulging part 16b of the switch part 16, and the elastic return of the bending parts 7a and 8a of the key 6 are carried out. Due to the force, the key 6 smoothly and smoothly rotates upward and returns to the initial position shown in FIG.

  As described above, according to this keyboard instrument, the plurality of key guide portions 11 provided on the keyboard chassis 2 for guiding the plurality of keys 6 in the vertical direction, respectively, and the plurality of key guide portions 11 are provided. When a plurality of keys 6 are pressed, a plurality of load applying members 40 that respectively apply loads due to frictional resistance to the keys 6 that have been pressed, and a plurality of keys 6 are provided. A plurality of load application release units 29 that respectively release the application of the load by the load application member 20 to the key 6 when the operated operation of pushing down the key 6 is completed, Similarly, a key touch feeling similar to that of an acoustic piano can be obtained during a key pressing operation without using a hammer member, and a plurality of load applying members 40 can be provided without using a viscous lubricant 28. It is possible to impart a load to each key 6 me.

  That is, in this keyboard instrument, the frictional deformation portion 41 of the load applying member 40 is formed with a notch groove 52 in each of the first and second arm portions 24 and 25 integrally formed on the upper and lower portions of the support portion 22. Therefore, even when the key 6 is pressed, even if the friction arm 26 of the friction deforming portion 41 is pressed against the inner surface 6a of the key 6 to increase the frictional resistance, the frictional resistance is not less than a certain level. When it increases, the first and second arm portions 24, 25 can be elastically deformed so as to be bent by the notch groove 42, and the frictional resistance can be released. For this reason, the key 6 can be returned to the initial position by returning the friction deformation portion 41 to the original shape.

  In the third embodiment described above, the notched grooves 42 are respectively formed in the first and second arm portions 24 and 25 of the load applying member 20 of the first embodiment without using the lubricant 28 as the load applying member 40. However, the present invention is not limited to this. For example, in the load application member 30 of the second embodiment, the first and second arm portions 24 and 25 are notched without using the lubricant 28. The groove 42 may be formed, and the lubricant 28 may also be used in the load applying member 41 of the third embodiment.

  In the first to third embodiments, the first and second arm portions 24 and 25 and the friction arm portion 26 of the friction deformation portions 23, 33, and 41 of the load applying members 20, 30, and 40 are made of synthetic resin. Although the case where it is formed integrally has been described, the present invention is not limited to this, and the first and second arm portions 24 and 25 and the friction arm portion 26 are formed as separate members, and the first and second arm portions 24 are formed separately. , 25 are rotatably attached to the support portions 22 and 32 by shafts, and both end portions of the friction arm portion 26 are rotatably attached to the first and second arm portions 24 and 25 by shafts. You may comprise as.

  Furthermore, in Embodiments 1 to 3 described above, the key 6 includes the white key 7 and the black key 8, and the white key 7 is formed with a thin bent portion 7a formed at each rear end portion thereof, and the bent portion. And a common support portion 7b that is continuous with the arrangement direction of the keys 6 and the black key 8 is formed at each rear end portion thereof, and the bent portion 8a is connected to the bent portion 8a. Although the case where it is the structure provided with the common support part 8b which continues in the sequence direction of the key 6 was described, not only this but the key 6 includes the rear end part of the white key 7 and the rear end part of the black key 8. May be configured to be rotatably attached to the support shafts provided on the key support portion 18 of the keyboard chassis 2 independently of each other.

As mentioned above, although several embodiment of this invention was described, this invention is not limited to these, The invention described in the claim, and its equal range are included.
Below, the invention described in the claims of the present application is appended.

(Appendix)
The invention according to claim 1 is a keyboard device in which a plurality of keys are arranged in parallel in a state in which the plurality of keys are rotatably mounted on the keyboard chassis, and the keys are provided on the keyboard chassis. A plurality of key guide portions that are respectively guided in the vertical direction, and are provided in the plurality of key guide portions, respectively, and when the plurality of keys are pressed, frictional resistance is applied to the keys that are pressed. When a plurality of load applying members for applying a load and a plurality of keys, each of which is provided to each of the plurality of keys, are pressed, the load applying member applies the load to the keys. A keyboard device comprising a plurality of load application canceling units that respectively cancel.

  According to a second aspect of the present invention, in the keyboard device according to the first aspect, the load applying member includes a support portion provided in the key guide portion, and a key pressing operation performed by the key provided on the support portion. A frictional deformation portion that deforms according to the frictional resistance generated between the key and the key that has been pressed, and applies a load due to the frictional resistance associated with the deformation to the key. A keyboard device characterized by the above.

  According to a third aspect of the present invention, in the keyboard device according to the second aspect, the frictionally deforming portion extends obliquely upward to the upper and lower portions of the support portion via first and second bent portions. The first and second arm portions provided in the above state and the respective distal ends of the first and second arm portions are respectively stretched up and down via a third bent portion, and the key A keyboard device comprising: a friction arm portion that contacts and slides in an detachable manner on an inner surface.

  According to a fourth aspect of the present invention, in the keyboard device according to the second or third aspect, the load applying member is elastic when the frictionally deforming portion is elastically deformed by pressing the key. A keyboard device comprising a deformation restricting portion for restricting a deformed state.

  According to a fifth aspect of the present invention, in the keyboard device according to any one of the first to fourth aspects, the load application canceling unit is configured to perform the key pressing operation when the key pressing operation is completed. A keyboard device characterized in that the load applying member is a step recess for separating the load applying member from the sliding surface of the key.

  According to a sixth aspect of the present invention, in the keyboard device according to any one of the first to fifth aspects, a viscous lubricant is provided between the key and the load applying member. A keyboard device characterized by the above.

  A seventh aspect of the present invention is the keyboard device according to any one of the first to sixth aspects, wherein the plurality of key guide portions are formed integrally with the keyboard chassis, respectively, and the plurality of loads are applied. The member is formed integrally with each of the plurality of key guide portions, and the plurality of load application release portions are formed integrally with the plurality of keys, respectively.

DESCRIPTION OF SYMBOLS 1 Musical instrument case 2 Keyboard chassis 6 Key 6a Each inner surface 11 Key guide part 20, 30, 40 Load provision member 22, 32 Support part 23, 33, 41 Friction deformation part 24 1st arm part 24a 1st bending Part 25 Second arm part 25a Second bent part 26 Friction arm part 26a Third bent part 27, 35 Deformation restricting part 28 Lubricant 29, 36 Load application release part 29a, 36a Step recess part 34 Friction protrusion part 34a Friction Both sides of protrusion 42 Notch groove

Claims (7)

In a keyboard device in which a plurality of keys are arranged in parallel in a state where the keys are rotatably mounted on the keyboard chassis,
A plurality of key guide portions provided on the keyboard chassis, each for guiding the plurality of keys in the vertical direction;
A plurality of load applying members that are provided in the plurality of key guide portions, respectively, and that apply a load due to frictional resistance to the keys that have been pressed, when the keys are pressed.
A plurality of load imparting release units respectively provided to the plurality of keys and releasing the load imparted by the load imparting member to the keys when the pressing operation of the plurality of keys that have been pressed is completed;
A keyboard device characterized by comprising:   2. The keyboard device according to claim 1, wherein the load applying member is operated by pressing the key when the key is pressed by the support portion provided at the key guide portion and the support portion. A keyboard device comprising: a friction deformation portion that deforms according to a frictional resistance generated between the key and a frictional deformation portion that applies a load due to the frictional resistance accompanying the deformation to the key.   3. The keyboard device according to claim 2, wherein the frictional deformation portion is provided in a state of extending obliquely upward through first and second bent portions on the upper and lower portions of the support portion. Each of the second arm portions and the tip portions of the first and second arm portions are stretched up and down via a third bent portion, and can be brought into and out of contact with the inner surface of the key. A keyboard device comprising: a friction arm portion that contacts and slides.   4. The keyboard device according to claim 2, wherein the load applying member includes a deformation restricting portion that restricts an elastic deformation state when the friction deforming portion is elastically deformed by pressing the key. A keyboard device characterized by comprising.   5. The keyboard device according to claim 1, wherein the load applying release unit slides the load applying member on the load applying member when a key pressing operation performed by pressing the key is completed. A keyboard device, characterized in that the keyboard device is a step recess for separating from a surface.   6. The keyboard apparatus according to claim 1, wherein a viscous lubricant is provided between the key and the load applying member. The keyboard device according to any one of claims 1 to 6, wherein the plurality of key guide portions are integrally formed with the keyboard chassis, and the plurality of load applying members are formed on the plurality of key guide portions. A keyboard device characterized in that each of the plurality of load application release units is formed integrally with each of the plurality of keys.

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