JP5648835B2 - Keyboard device - Google Patents

Description

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

  2. Description of the Related Art Conventionally, in a keyboard device such as an electronic piano, as described in Patent Document 1, in order to obtain a key touch feeling similar to an acoustic piano, a keyboard on which a plurality of keys are attached so as to be rotatable in the vertical direction. There is known a configuration in which a plurality of hammer members for attaching an action load to each key according to each key pressing operation of the plurality of keys are attached to the chassis so as to be rotatable in the vertical direction.

Japanese Patent Laid-Open No. 05-108059

  However, in such a conventional keyboard device, since a plurality of hammer members must be manufactured as separate parts, the productivity is poor, the number of parts is increased, the assembly work is complicated, and the manufacturing cost is increased. Moreover, since the weight of the hammer member is heavy, there is a problem that the weight of the entire apparatus becomes extremely heavy and the carrying is inconvenient.

  The problem to be solved by the present invention is to provide a keyboard device that can apply a load to a key and increase a key touch without using a hammer member during a key pressing operation.

In order to solve the above problems, the present invention includes the following components.
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 each of the plurality of key guide portions and the plurality of keys is provided, and when the plurality of keys are pressed, the key pressing operation is performed. A plurality of load applying members that apply a load due to frictional resistance to the key , and each of the plurality of load applying members includes the key guide portion and the key corresponding to the load applying member. A support portion provided on any one of the keys, and the other of the key provided on the support portion and pressed when the key is pressed and the corresponding key guide portion. Friction between Elastically deformed in response to anti-a keyboard apparatus, wherein a load caused by friction resistance caused by the elastic deformation and a friction deforming unit which imparts to the key.

According to a second aspect of the present invention, the support portion is provided in the key guide portion in a state where the support portion is inserted into the key from the lower side, and the friction deformation portion is provided on the upper and lower portions of the support portion. The first and second arm portions provided in a state of extending obliquely upward through the first and second bent portions, and the distal ends of the first and second arm portions each stretched vertically through the third bent portion, to claim 2, characterized in that it comprises a friction arm that slides in contact with separable ready the inner surface of the key It is a keyboard apparatus of description.

According to a third aspect of the present invention, the support portion is provided inside the key in a state where the support portion is inserted into the key guide portion from above, and the friction deformation portion is provided at the upper and lower portions of the support portion. 1. Each of the first and second arm portions provided in a state of extending obliquely downward through the first and second bent portions, and the distal ends of the first and second arm portions, respectively. stretched vertically through the third bent portion, claim 1, characterized in that it comprises a said key guides of the friction arm slides in contact with separable ready to the inner surface portion It is a keyboard apparatus as described in above.

According to a fourth aspect of the present invention, 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 apparatus according to claim 1, claim 3, characterized.

The invention according to claim 5 is characterized in that a lubricant having viscosity is provided between any one of the key guide part and the key and the load applying member. Item 5. The keyboard device according to Item 4 .

According to a sixth aspect of the present invention, the key guide portion is formed integrally with the keyboard chassis, and the plurality of load applying members are formed integrally with one of the key guide portion and the key. a keyboard device according to any one of claims 1 to 5, characterized in that there.

  According to this 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 to increase the key load. For this reason, the key touch can be increased by applying a load to the key during the key pressing operation without using a hammer member, so that a key touch feeling similar to an acoustic piano can be obtained and the weight of the entire device can be obtained. Can be significantly lightened, thereby providing a convenient portable device.

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. 1. FIG. 3 is an enlarged cross-sectional view of a main part illustrating a state in which the key is pressed and the friction deformation portion is elastically deformed by frictional resistance between the key in the load applying member of 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 key is further pressed down and the key is slid with respect to the friction deformation portion in the load applying member of the key guide portion illustrated 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. 6 is an enlarged cross-sectional view of the main portion of the load applying member of the key guide portion shown in FIG. 6, in which the key is pressed and the friction deformation portion is elastically deformed by the frictional resistance between the key and the friction projection portion of the key. FIG. FIG. 8 is an enlarged cross-sectional view of a main part illustrating a state in which the key is further pushed down and the friction projection of the key slides with respect to the friction deformation portion in the load applying member of the key guide portion illustrated in FIG. 7. It is sectional drawing which showed 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 in the BB arrow of the keyboard musical instrument shown in FIG. FIG. 11 is an enlarged cross-sectional view of a main part illustrating a state in which the key is pressed and the friction deformation portion is elastically deformed by a frictional resistance between the key and the key guide portion in the load applying member of the key guide portion illustrated in FIG. 10. is there. FIG. 12 is an enlarged cross-sectional view of a main part showing a state in which the key is further pushed down and the friction deformation portion of the key slides with respect to the key guide portion in the load applying member of the key guide portion shown in FIG. 11. In Embodiment 4 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. 14 is an enlarged cross-sectional view of a main part illustrating a state in which the key is pressed and the friction deformation portion is elastically deformed by a frictional resistance between the key in the load applying member of the key guide portion illustrated in FIG. 13. FIG. 15 is an enlarged cross-sectional view of a main part illustrating a state in which the key is further pushed down and the key slides with respect to the friction deformation portion in the load applying member of the key guide portion illustrated in FIG. 14.

(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, the key position restricting portion 12 is configured such that the hook portion 13a of the key protruding portion 13 is opened to the opening portion 12a when the key 6 that has been pressed in the state shown in FIG. 1 returns to the initial position (the state shown in FIG. 1). The key 6 is restricted to the upper limit position, which is the initial position, by moving inwardly and contacting 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 (the left-right direction in FIG. 2), and the length between the insides of the keys 6 in the same direction. They are almost the same or 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, and is configured to restrict elastic deformation of the friction deformation portion 23 by restricting rotational displacement of the first and second arm portions 24, 25 downward. .

  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 surface 6 a of the key 6.

  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, when the key 6 is depressed and the lubricant 28 is restricted to the lower limit position by the lower limit stopper portion 12c, the lubricant arm 26 and the inner side surface 6a of the key 6 are separated. By relatively sliding, the frictional resistance generated between the friction arm portion 26 of the friction deformation portion 23 and the inner surface 6a of the key 6 is reduced or released, and the friction deformation portion 23 is in the original state shown in FIG. It is configured to return to

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.

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 deforming 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 indicated by a curve A in FIG. 5, the load of the key 6 increases rapidly and the key touch becomes heavy.

  Then, when the key 6 is further pushed down and the second arm part 25 of the frictional deformation part 23 is rotationally displaced downward together with the inner side surface 6a of the key 6, as shown in FIG. The elastic deformation of the friction deformation portion 23 is restricted by coming into contact with the deformation restriction portion 27 from above. When the key 6 is further pushed down in this state, the downward displacement of the second arm portion 25 is restricted by the deformation restricting portion 27. Therefore, as shown in FIGS. The inner surface 6 a of the key 6 slides relative to the friction arm portion 26 by the lubricant 8 interposed between the inner surface 6 a of the key 6 and the lubricant 6.

  Therefore, at this time, as indicated by a straight line B in FIG. 5, even if the key 6 is pushed down, the load on the key 6 hardly changes. When the key 6 is further pushed down in this state, 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 curve C in FIG. The load on the key 6 suddenly increases again, and 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, the frictional resistance generated between the friction arm portion 26 of the friction deformation portion 23 and the inner side surface 6a of the key 6 is reduced or released by the lubricant 28. Therefore, as shown in FIG. The part 23 returns to the original shape shown in FIG.

  Therefore, as shown in FIGS. 4 and 5, the friction deformation portion 23 does not apply a load due to frictional resistance to the key 6, and the elastic return force of the bulging portion 16 b of the switch portion 16 and the key 6. Due to the elastic return force of the bent portions 7a and 8a, the key 6 rotates smoothly and smoothly upward. At this time, as shown by a curve D in FIG. 5, the load of the key 6 rapidly decreases and returns to the initial key load.

  In this state, when the key 6 further moves upward, 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 16b of the switch portion 16 switches to the switch. Since it is away from the fixed contact of the 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, and the key 6 is restricted to the initial position.

  Thus, according to 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. A plurality of key guide portions 11 that are provided, and a load caused by frictional resistance is applied to the keys 6 that are provided on the plurality of key guide portions 11 when the keys 6 are pressed. 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. Can be heavy.

  For this reason, in such a keyboard instrument, even if a hammer member as in the conventional example is not used, a load can be applied to the key 6 at the time of the key pressing operation, and the key touch can be surely made heavy. An approximate key touch feeling 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 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 is 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 surely increased.

  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. When the key is pressed and depressed, the friction arm portion 26 can be reliably pressed against the inner surface 6a of the key 6 and a load accompanying this pressing can be reliably applied to the key 6.

  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, 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 second arm portion 25 of the friction deformation portion 23 is rotationally displaced downward by the key operation, the second arm portion 25 comes into contact with the elastic deformation portion 23 to restrict elastic deformation of the friction deformation portion 23. For this reason, even if the frictional resistance generated between the inner surface 6a of the key 6 and the friction arm portion 26 increases when the key 6 is pushed down, the frictional resistance can be prevented from increasing beyond a certain level. Thereby, the return of the key 6 to the initial position can be facilitated.

  In this case, 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 inner surface 6a, the first and second arm portions 24 and 25 can be rotationally displaced downward while pulling down the friction arm portion 26 of the friction deformation portion 23. As a result, the friction arm portion 26 can be brought into contact with the inner side surface 6a of the key 6 to reliably generate a frictional resistance.

  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, the friction arm portion 26 and the inner side surface 6a of the key 6 are caused by the lubricant 28. Can be slid while relatively sliding. Further, when the key 6 is depressed and is regulated to the lower limit position by the lower limit stopper portion 12c, the friction arm portion 26 and the inner side surface 6a of the key 6 slide relative to each other, thereby The frictional resistance generated between the friction arm portion 26 and the inner side surface 6a of the key 6 can be reduced or released, whereby the friction deforming portion 23 can be easily returned to the original shape. However, the key 6 can be quickly and satisfactorily returned to the initial position without being substantially affected by the frictional resistance.

  Further, 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, whereby the load applying member 20 is provided for each of the plurality of keys 6. Even if it is provided, the plurality of load applying members 20 can be molded together with the plurality of key guide portions 11 and the keyboard chassis 2 by the molding die. For this reason, the productivity is good and the number of parts can be greatly reduced as compared with the case where a hammer member is used, thereby improving the assembling workability and reducing the cost. be able to.

(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 has a configuration different from that of the first embodiment in a load applying member 30 that applies a load to the key 6 when the key 6 is pressed. It has the same configuration.

  The load applying member 30 is made of a synthetic resin such as polypropylene, and as shown in FIG. 6, a pair of base portions 31 provided on the key guide portion 11 and a pair of base portions 31 provided on the pair of base portions 31 respectively. A support portion 32 and a pair of friction deformation portions 33 provided 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 is obliquely upward toward the friction projection 34 of the key 6 via the first and second bent portions 24a and 25a on the upper and lower portions of the pair of support portions 32. The first and second arm portions 24 and 25 provided in an extended state, and the tip portions of the first and second arm portions 24 and 25 are vertically moved via third bent portions 26a. And a friction arm portion 26 stretched between the two.

  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, the friction arm portion 26 comes into contact with and slides on the friction projection 34 of the key 6 when the key 6 is pressed, thereby sliding. 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. Therefore, as shown in FIGS. 6 to 8, the friction deformation portion 33 is in a state in which the friction arm portion 26 can contact and separate from the friction projection portion 34 of the key 6 when the key 6 is pressed. By sliding while making contact, a frictional resistance is generated between the key 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, when the key 6 is pressed and the second arm portion 25 of the friction deforming portion 33 is rotationally displaced downward, the deformation restricting portion 35 is moved upward. The elastic deformation of the frictional deformation portion 33 is regulated by abutting from the front.

  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. 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 reduced or released by sliding relatively, and the friction deformation portion 33 is shown in FIG. It is comprised so that it may return to the shape of.

  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. Also, when playing with this keyboard instrument, as with the first embodiment, it can be played 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 portion 26 is pressed against the friction projection 34 of the key 6, so that a frictional resistance is generated between the friction deformation portion 33 and the friction projection 34 of the key 6. A load is applied to the key 6 by the frictional resistance, and the key load becomes heavy. At this time, as indicated by the curve A in FIG.

  Then, when the key 6 is further pushed down and the second arm portion 25 of the frictional deformation portion 33 is rotationally displaced downward together with the frictional projection portion 34 of the key 6, as shown in FIG. Comes into contact with the deformation restricting portion 35 from above, and the elastic deformation of the friction deforming portion 33 is restricted. When the key 6 is further pushed down in this state, the downward displacement of the second arm portion 25 is restricted by the deformation restricting portion 35, so that the friction arm portion 26 and the friction protrusion 34 of the key 6 As shown in FIG. 8, the friction projection 34 of the key 6 slides while sliding relative to the friction arm 26 by the lubricant 28 interposed therebetween.

  Therefore, at this time, as indicated by a straight line B in FIG. 5, even when the key 6 is pushed down, the load on the key 6 hardly changes. When the key 6 is further pushed down in this state, 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 curve C in FIG. The load of the key 6 suddenly increases again, and 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, since 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 reduced or released by the lubricant 28, as shown in FIG. The deforming portion 33 returns to the original shape shown in FIG.

  For this reason, the friction deformation portion 33 does not apply a load due to frictional resistance to the key 6, and the elastic return force of the bulging portion 16 b of the switch portion 16 and the elastic return force of the bent portions 7 a and 8 a of the key 6. As a result, the key 6 rotates smoothly and smoothly upward. At this time, as indicated by the curve D in FIG. 5, the load of the key 6 rapidly decreases and returns to the initial key load.

  In this state, when the key 6 further moves upward, the switch portion 16 pushes up the switch pressing portion 17 to return to the initial state as in the first embodiment, and the movable contact in the bulging portion 16b of the switch portion 16 becomes the switch substrate. Since it is away from the 14 fixed contacts, 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, and the key 6 is restricted to the initial position.

  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. A plurality of key guide portions 11 are provided in each of the plurality of key guide portions 11, and when a plurality of keys 6 are depressed, a load due to frictional resistance is applied to the depressed keys 6. By providing the plurality of load applying members 30, as in the first embodiment, 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. It can be applied to increase the key load.

  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. As a result, it is possible to obtain a key touch feeling similar to an acoustic piano. 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 pressed, a frictional resistance is generated between the key 6 and the pair of frictional deformation parts 33, and the pair of frictional deformation parts 33 can be elastically deformed by the frictional resistance. Since the frictional resistance can be increased by the elastic deformation of the frictional deformation portion 33, the key load can be reliably 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 through the respective third bent portions 26a and that come into contact with and separate from the friction projections 34 of the key 6 and slide in contact with the friction projections 34. Therefore, as in the first embodiment, when the key 6 is depressed by being depressed, the friction arm portion 26 can be surely pressed against the friction projection 34 of the key 6, and the load caused by this pressing is reduced to the key 6. Can be reliably given.

  That is, when the key 6 is depressed and depressed, a frictional resistance is generated between the frictional projection 34 and the frictional arm 26 of the key 6, and each of the first and second bending is caused by this frictional resistance. While the portions 24 a and 25 a are bent, the first and second arm portions 24 and 25 can be rotationally displaced to reliably press the friction arm portion 26 against the friction projection 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, 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 depressed and the second arm portion 25 of the frictional deformation portion 33 is rotationally displaced downward, the second arm portion 25 comes into contact with the elastic deformation of the frictional deformation portion 33. can do. 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. This makes it easy to return the key 6 to the initial position.

  In this case, since the viscous lubricant 28 is provided between the friction projection 34 of the key 6 and the load applying member 30, the key 6 is depressed when the key 6 is depressed and depressed. The first and second arm portions 24 and 25 are rotationally displaced downward while 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. As a result, the friction arm 26 can be brought into contact with the friction projection 34 of the key 6 to reliably generate a frictional resistance.

  Further, when the key 6 is pressed 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 and the friction projection portion 34 of the key 6 are caused by the lubricant 28. Can be slid while relatively sliding. Further, when the key 6 is depressed and is restricted to the lower limit position by the lower limit stopper portion 12c, the friction arm portion 26 and the friction projection portion 34 of the key 6 slide relative to each other, thereby causing the friction deformation portion 33. The frictional resistance generated between the friction arm portion 26 and the friction projection portion 34 of the key 6 can be reduced or released, whereby the friction deformation portion 33 can be easily returned to the original shape. The key 6 can be returned to the initial position quickly and satisfactorily without being affected by the frictional resistance.

  Further, the key guide portion 11 is also formed integrally with the keyboard chassis 2, and the plurality of load applying members 30 are formed integrally with the key guide portion 11. Even if the load applying member 30 is provided, the plurality of load applying members 30 can be formed together with the plurality of key guide portions 11 and the keyboard chassis 2 by a molding die. For this reason, the productivity is good and the number of parts can be greatly reduced as compared with the case where a hammer member is used, thereby improving the assembling workability and reducing the cost. be able to.

(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 FIGS. 9 and 10, the keyboard instrument includes a key guide portion 40 that guides a plurality of keys 6 in the vertical direction, and a load applying member that applies a load to the keys 6 when the keys 6 are pressed. 41 is a configuration different from that of the first embodiment, and the other configuration is substantially the same as that of the first embodiment.

  As shown in FIGS. 9 and 10, the key guide portion 40 is provided at a position on the rear side (right side in FIG. 9) of the front cover portion 10 in the keyboard chassis 2 to guide the white key 7 in the vertical direction. And a black key for guiding the black key 8 in the vertical direction, which is provided at a position located at the rear portion (right side in FIG. 9) of the key position restricting portion 12 in the keyboard chassis 2. There are two.

  As shown in FIG. 10, the key guide portion 40 is formed in a groove shape in which a guide projection portion 42 provided inside the key 6 and suspended is inserted with play from above. That is, the key guide portion 40 has a pair of side wall portions 40a, and the length (width L) in the arrangement direction (the left-right direction in FIG. 10) of the keys 6 outside the pair of side wall portions 40a is It is formed slightly shorter than the outer length (width) of the key 6 in the same direction. Accordingly, the key guide portion 40 is configured to be inserted into the key 6 so as to be relatively movable in the vertical direction and to guide the key 6 in the vertical direction.

  On the other hand, as shown in FIG. 10, the load applying member 41 is formed integrally with the lower part of the guide projection 42 of the key 6, and when the key 6 is pressed, On the other hand, it is comprised so that the load by frictional resistance may be provided. That is, the load applying member 41 is made of a synthetic resin such as polypropylene as in the first embodiment, and includes a base portion 43 provided at the lower portion of the guide projection portion 42 of the key 6 and a support provided at the base portion 43. And a pair of friction deformation portions 45 provided on the support portion 44.

  As shown in FIG. 10, the base portion 43 is integrally formed so as to be suspended from the lower portion of the guide projection portion 42. The support portion 44 is integrally formed so as to be suspended from the center portion at the lower portion of the base portion 43 and inserted between the pair of side wall portions 40 a of the key guide portion 40. As shown in FIGS. 10 to 12, the pair of friction deformation portions 45 are elastically deformed according to the frictional resistance generated between the key 6 and the key guide portion 40 when the key 6 is pressed. The load associated with the elastic deformation is applied to the key 6.

  That is, as shown in FIG. 10, the frictional deforming portion 45 is provided on the upper and lower portions of the support portion 44 so as to extend obliquely downward 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. 10, the first arm portion 24 extends in a diagonally downward direction from the lower end portion of the support portion 44 toward the inner side surfaces of the pair of side wall portions 40 a of the key guide portion 40. It is formed integrally with the support portion 44 via the portion 24a. The second arm portion 25 extends obliquely downward from the upper end portion of the support portion 44 toward the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40, and supports the support portion via the second bent portion 25a. 44 is formed integrally.

  In this case, as shown in FIG. 10, 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. 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. 10 to 12, each of the bent portions 24a and 25a is bent. 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. 10, the friction arm portion 26 has a lower portion formed integrally with the distal end portion of the first arm portion 24 via a third bent portion 26a and an upper portion of the third arm portion. By being integrally formed at 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 inner side surfaces of the pair of side wall portions 40a. Yes.

  As shown in FIGS. 10 to 12, the friction arm portion 26 comes into contact with the inner side surfaces of the pair of side wall portions 40 a in the key guide portion 40 when the key 6 is pressed. By sliding, a frictional resistance is generated between the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 corresponding to the key 6 that has been pressed. 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 guide portion 40 is configured to be displaced in the vertical direction along the inner side surfaces of the pair of side wall portions 40a.

  As a result, as shown in FIG. 10, the friction deforming portion 45 is formed in a link shape that forms a parallelogram as a whole, and is formed in a line-symmetric state on both the left and right sides of the support portion 44 as a center. Yes. For this reason, as shown in FIGS. 10 to 12, the friction deforming portion 45 has the friction arm portion 26 on the inner side surfaces of the pair of side wall portions 40 a of the key guide portion 40 when the key 6 is depressed. By sliding while contacting in a state where contact and separation are possible, frictional resistance is generated between the friction arm portion 26 of the key 6 that has been pressed and the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40. It is configured as follows.

  Further, as shown in FIGS. 10 to 12, the friction deformation portion 45 is formed when a frictional resistance is generated between the inner side surfaces of the pair of side wall portions 40 a of the key guide portion 40 by the key 6 being pressed. In addition, the first and second arm portions 24 and 25 are rotationally displaced upward about the first and second bent portions 24a and 25a by the frictional resistance, respectively, and the first and second arms. The frictional arm 26 is pressed against the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 in accordance with the rotational displacement of the portions 24 and 25, so that the frictional resistance is increased.

  On the other hand, in the load applying member 41 as well, as shown in FIGS. 10 to 12, when the key 6 is pressed and the pair of friction deformation portions 45 are elastically deformed, a pair of elastic deformation states are regulated. A deformation restricting portion 46 is provided. The pair of deformation restricting portions 46 are provided on the lower portions of the base portions 43 located on both sides of the support portion 44 so as to be inclined obliquely downward toward the inner side surface 6a of the key 6 respectively.

  Thereby, as shown in FIG. 11, when the key 6 is pressed and the second arm portion 25 of the friction deformation portion 45 is rotationally displaced upward, the deformation restricting portion 46 is moved to the second arm portion. The elastic deformation of the friction deforming portion 45 is restricted by restricting the rotational displacement of the first and second arm portions 24, 25 to the upper side by abutting 25 from the lower side.

  Also, a viscous lubricant 28 is provided between the load applying member 41 and the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40, as shown in FIGS. Similarly to the first embodiment, the lubricant 28 is also in a liquid or gel form (jelly form) having a viscosity, and has an optimum viscosity suitable for a key touch feeling when a key is pressed, and a load applying member. 41 is applied between the friction arm portion 26 of the friction deforming portion 45 and the inner side surfaces of the pair of side wall portions 40 a of the key guide portion 40.

  As shown in FIG. 11, the lubricant 28 has a viscosity of the lubricant 28 applied to each inner side surface of the pair of side wall portions 40 a of the key guide portion 40 when the key 6 is depressed and depressed. Thus, the first and second arm portions 24 and 25 are rotationally displaced upward while pushing up the friction arm portion 26 of the friction deforming portion 45, thereby making the friction arm portion 26 a pair of side wall portions 40 a of the key guide portion 40. It is comprised so that a frictional resistance may be generated by making it contact with the inner surface.

  As shown in FIG. 11, 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 45 comes into contact with the deformation restriction portion 46. And the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 are configured to slide relative to each other.

  Further, as shown in FIG. 12, the lubricant 28 has a pair of side walls of the friction arm portion 26 and the key guide portion 40 when the key 6 is depressed and regulated to the lower limit position by the lower limit stopper portion 12 c. The frictional resistance generated between the friction arm portion 26 of the friction deformation portion 45 and the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 is reduced or released by sliding relative to the inner surface of the portion 40a. The friction deforming portion 45 is configured to return to the original shape shown in FIG.

Next, a case where the load applying member 41 is molded with a molding die in such a keyboard instrument will be described.
In this molding method, there are two methods. One method is a method in which the load applying member 41 is integrally formed with the same material as the key 6 at the same time, and the other method is different between the load applying member 41 and the key 6. This is a method of molding two colors with a material.

  In the former method, a cavity (cavity) for forming the load applying member 41 is previously formed in a molding die composed of an upper die and a lower die for molding the key 6 using a slide core. Form. 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 applying member 41 is simultaneously molded with the same material as the key 6.

  In the latter method, the key 6 is molded in advance with a primary molding die including an upper die and a lower die, using a synthetic resin different from that of the load applying member 41. The load applying member 41 is formed by placing the key 6 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 41 is formed in the secondary molding die using a 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 41 is molded in two colors with a material different from that of the key 6.

Next, a description will be given of the case where a plurality of keys 6 are depressed and played with such a keyboard instrument.
Also in this case, in FIG. 9, when the white key 7 among the plurality of keys 6 is pressed, the white key 7 rotates counterclockwise around the bent portion 7a as in the first embodiment. When the black key 8 is pressed, the black key 8 rotates counterclockwise around the bent portion 8a. When the key 6 is pressed in this way and rotated counterclockwise in FIG. 9, the switch pressing portion 17 of the key 6 presses the switch portion 16 on the switch board 14 and is pressed as in the first embodiment. The switch unit 16 outputs a switch signal. Thereby, a musical sound is pronounced.

  Thus, when the key 6 is depressed and rotates counterclockwise in FIG. 9, the pair of friction deformation portions 45 of the load applying member 41 are elastically deformed with respect to the key 6 as shown in FIG. 11. Load. That is, when the key 6 is depressed by being depressed, the friction arm portion of the friction deformation portion 45 is caused by the viscosity of the lubricant 28 applied to each inner side surface of the pair of side wall portions 40a of the key guide portion 40. While pushing up 26, the first and second arm portions 24, 25 are rotationally displaced upward.

  As a result, the friction arm portion 26 is pressed against the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40, so that the friction deforming portion 45 and the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 are interposed. A frictional resistance 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 indicated by the curve A in FIG. 5, the load of the key 6 increases rapidly, and the key touch becomes heavy.

  Then, when the key 6 is further pushed down and the second arm portion 25 of the frictional deformation portion 45 is rotationally displaced relatively upward along the respective inner side surfaces of the pair of side wall portions 40a of the key guide portion 40, FIG. As shown in FIG. 2, the second arm portion 25 comes into contact with the deformation restricting portion 46 from below, and the elastic deformation of the friction deforming portion 45 is restricted.

  If the key 6 is further pushed down in this state, the rotational displacement of the second arm portion 25 to the upper side is restricted by the deformation restricting portion 46, so that the pair of side wall portions of the friction arm portion 26 and the key guide portion 40 As shown in FIG. 12, the friction arm portion 26 of the key 6 is relative to the inner side surfaces of the pair of side wall portions 40 a of the key guide portion 40 by the lubricant 8 interposed between the inner side surfaces of the key guide portion 40. Slide down while sliding.

  Therefore, at this time, as indicated by a straight line B in FIG. 5, even when the key 6 is pushed down, the load on the key 6 hardly changes. When the key 6 is further pushed down in this state, 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 curve C in FIG. The load of the key 6 suddenly increases again, and 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, the frictional resistance generated between the friction arm portion 26 of the friction deformation portion 45 and the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 is reduced or released by the lubricant 28. As shown in FIG. 10, the friction deforming portion 45 returns to the original shape shown in FIG.

  For this reason, the load due to the frictional resistance of the friction deformation portion 45 against the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 is not applied to the key 6, and the elastic return of the bulging portion 16b of the switch portion 16 is achieved. Due to the force and the elastic restoring force of the bent portions 7a and 8a of the key 6, the key 6 rotates smoothly and smoothly upward. At this time, as indicated by the curve D in FIG. 5, the load of the key 6 rapidly decreases and returns to the initial key load.

  In this state, when the key 6 further moves upward, as shown in FIG. 9, 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 switched to the switch portion 16. Since it is away from the fixed contact of the 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, and the key 6 is restricted to the initial position.

  Thus, according to 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. A plurality of key guide units 40 and a plurality of keys 6 are provided respectively. When a plurality of keys 6 are pressed, a plurality of keys 6 are applied to apply a load due to frictional resistance. When the key 6 is pressed, the load applying member 41 applies a load due to frictional resistance when the key 6 is pressed as in the first embodiment. The key load can be increased.

  For this reason, also in such a keyboard instrument, as in the first embodiment, even if a hammer member as in the conventional example is not used, a load is applied to the key 6 at the time of the key pressing operation, and the key touch is surely made heavy. Therefore, it is possible to obtain a key touch feeling similar to an acoustic piano. 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 41 includes a support portion 44 provided on the key 6 and a pair of side wall portions 40 a of the key guide portion 40 provided when the key 6 is pressed by the support portion 44. By providing a pair of friction deformation portions 45 that elastically deform according to the frictional resistance generated between the side surfaces and apply a load associated with the elastic deformation to the key 6, the key 6 is pressed. Then, a frictional resistance is generated between the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 and the pair of friction deformation portions 45, and the pair of friction deformation portions 45 can be elastically deformed by the friction resistance. Since the frictional resistance can be increased by the elastic deformation of the pair of frictional deformation portions 45, the key load can be reliably increased.

  Further, the support portion 44 is provided on the key 6 in a state of being inserted from above into the pair of side wall portions 40 a in the key guide portion 40, and the friction deforming portion 45 is first on the upper and lower portions of the support portion 44. The first and second arm portions 24 and 25 provided in a state of extending obliquely downward through the second bent portions 24a and 25a, and the first and second arm portions 24, respectively. , 25 are stretched up and down via respective third bent portions 26a, and are slidable in contact with and detachable from the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40. Since the arm portion 26 is provided, the friction arm portion 26 can be reliably pressed against the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 when the key 6 is depressed by being depressed. The load accompanying the pressing can be reliably applied to the key 6 Kill.

  That is, when the key 6 is depressed and depressed, a frictional resistance is generated between the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 and the friction arm portion 26, and this frictional resistance causes the first to occur. The first and second arm portions 24 and 25 are rotationally displaced while the second bent portions 24a and 25a are bent, so that the friction arm portion 26 is attached to the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40. It can be pressed reliably. For this reason, the rotational displacement of each of the first and second arm portions 24 and 25 gradually increases as the key 6 is pushed down, so that the inner surface of the pair of side wall portions 40a of the key guide portion 40 and the friction arm portion 26 are increased. The frictional resistance generated between the key load and the key load can be increased quickly.

  Further, the load applying member 41 includes the deformation restricting portion 46 that restricts the elastic deformation state when the key 6 is pressed and the pair of friction deforming portions 45 are elastically deformed. Similarly, when the key 6 is pressed and the second arm part 25 of the frictional deformation part 45 is rotationally displaced upward, the second arm part 25 comes into contact with the elastic deformation of the frictional deformation part 45. be able to. For this reason, even if the key 6 is pushed down and the frictional resistance generated between the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 and the friction arm portion 26 increases, the frictional resistance does not increase beyond a certain level. Thus, the key 6 can be easily returned to the initial position.

  In this case, since the viscous lubricant 28 is provided between the inner surface of the pair of side wall portions 40a of the key guide portion 40 and the load applying member 41, the key 6 is depressed and depressed. The first and second arms while pushing up the friction arm portion 26 of the friction deformation portion 45 by the viscosity of the lubricant 28 applied to the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40. The portions 24 and 25 can be rotationally displaced upward, whereby the friction arm portion 26 can be brought into contact with the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 and the frictional resistance can be reliably generated.

  Further, when the key 6 is pressed and the second arm portion 25 of the friction deformation portion 45 comes into contact with the deformation restriction portion 46, a pair of the friction arm portion 26 and the key guide portion 40 is made by the lubricant 28. It can be slid while relatively sliding with the inner surface of the side wall 40a. Further, when the key 6 is depressed and is regulated to the lower limit position by the lower limit stopper portion 12c, the friction arm portion 26 and the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 slide relatively. Thus, the frictional resistance generated between the friction arm portion 26 of the friction deformation portion 45 and the inner side surfaces of the pair of side wall portions 40a of the key guide portion 40 can be reduced or released. Since the key 6 can be easily returned to the original shape, the key 6 can be quickly and satisfactorily returned to the initial position without being substantially affected by the frictional resistance.

  Further, the key guide portion 40 is formed integrally with the keyboard chassis 2, and the plurality of load applying members 20 are formed integrally with the key 6, so that a load applying member 41 is provided for each of the plurality of keys 6. Even so, the load applying member 41 can be molded together with the key 6 by the molding die. For this reason, as in the first embodiment, the productivity is good, and the number of parts can be greatly reduced as compared with the case of using a hammer member, thereby improving the assembly workability. The price can also be reduced.

(Embodiment 4)
Next, a fourth 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.
In this keyboard instrument, as shown in FIG. 13, the frictional deformation portion 51 of the load applying member 50 that applies a load to the key 6 when the key 6 is depressed is different from that of the first embodiment. Has substantially the same configuration as that of the first embodiment.

  That is, the load applying member 50 is configured to directly contact the friction deforming portion 51 with the inner side surface 6 a of the key 6 without using the viscous lubricant 28. For this reason, the frictional deformation portion 51 of the load applying member 50 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 depressed, the friction 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 51 is depressed by the inner surface 6a of the key 6. To rotational displacement.

  As a result, as shown in FIG. 14, 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 51 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. Then, when the key 6 is further pushed down and the second arm portion 25 of the frictional deformation portion 51 is rotationally displaced downward, the second arm portion 25 comes into contact with the deformation restricting portion 27 as shown in FIG. Thus, the elastic deformation of the friction deformation portion 51 is restricted.

  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 52 provided in the first and second arm portions 24, 25, respectively. 25 is bent, thereby restricting elastic deformation of the frictional deformation portion 51. When the key 6 is further pushed down in this state, the first and second arm portions 25 are further bent, so that the key 6 slides relative to the friction arm portion 26 as shown in FIG. Move.

  For this reason, the frictional resistance generated between the friction arm portion 26 of the friction deformation portion 51 and the inner side surface 6a of the key 6 is reduced or released, and therefore, as shown in FIG. The original shape shown in FIG. Thereby, since the friction deformation part 51 does not give 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.

  Thus, according to 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. A plurality of key guide portions 11 that are provided, and a load caused by frictional resistance is applied to the keys 6 that are provided on the plurality of key guide portions 11 when the keys 6 are pressed. When the key 6 is depressed, the load imparting member 50 is loaded by frictional resistance when the key 6 is depressed, as in the first embodiment. To increase the key load.

  For this reason, also in such a keyboard instrument, as in the first embodiment, even if a hammer member as in the conventional example is not used, a load is applied to the key 6 at the time of the key pressing operation, and the key touch is surely made heavy. Therefore, it is possible to obtain a key touch feeling similar to an acoustic piano. 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 50 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 provided with a frictional deformation portion 51 that elastically deforms according to the frictional resistance generated therebetween and applies a load due to the frictional resistance accompanying the elastic deformation to the key 6. When the key is pressed, a frictional resistance is generated between the key 6 and the frictional deformation part 51, and the frictional deformation part 51 can be elastically deformed by the frictional resistance. Since the resistance can be increased, the key load can be reliably increased.

  The support portion 22 is provided in the key guide portion 11 in a state where the support portion 22 is inserted into the key 6 from the lower side, and the friction deformation portion 51 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. And a friction arm portion 26 that is stretched up and down via a third bent portion 26a and slidably contacts with the inner side surface 6a of the key 6 in an embodiment. 1, when the key 6 is depressed by being depressed, the friction arm portion 26 can be reliably pressed against the inner side surface 6 a of the key 6, and the load accompanying this pressing is reliably applied to the key 6. be able to.

  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, thereby increasing the key load quickly.

  In this case, the first and second arm portions 24 and 25 are each formed with a notch groove 52, so that the friction arm portion 26 in the friction deformation portion 51 is pressed against the inner surface 6 a of the key 6. Even if the frictional resistance increases, when the frictional resistance increases to a certain level or more, the first and second arm portions 24 and 25 are elastically deformed so as to be bent by the notch groove 52, thereby releasing the frictional resistance. Can do. For this reason, the friction deformation part 51 can be returned to the original shape, and the key 6 can be returned to the initial position.

  In the fourth embodiment described above, the notched grooves 52 are 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 50. 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 52 may be formed. For example, in the load applying member 41 of the third embodiment, the first and second arm portions 24 and 25 are notched in the first and second arm portions 24 and 25 without using the lubricant 28. 52 may be formed.

  Further, in the above-described first to fourth embodiments and the modifications thereof, the key 6 has the white key 7 and the black key 8, and the white key 7 has a thin bent portion 7a formed at each rear end thereof. The bent portion 7a is connected to the common support portion 7b that is continuous in the arrangement direction of the keys 6, and the black key 8 is formed at each rear end portion of the thin-walled bent portion 8a, and the bent portion 8a Although the case where it is the structure provided with the common support part 8b connected and continued in the arrangement | sequence direction of the key 6 was described, not only this but the key 6 is the back end part of the white key 7, and the back of the black key 8. It may have a configuration in which the end portion is rotatably attached in a state of being independent of the support shaft provided in the key support portion 18 of the keyboard chassis 2.

DESCRIPTION OF SYMBOLS 1 Musical instrument case 2 Keyboard chassis 6 Key 6a Each inner surface 11, 40 Key guide part 20, 30, 41, 50 Load application member 22, 32, 44 Support part 23, 33, 45, 51 Friction deformation part 24 1st Arm part 24a First bent part 25 Second arm part 25a Second bent part 26 Friction arm part 26a Third bent part 27, 35, 46 Deformation restricting part 28 Lubricant 32 Friction protrusion part 52 Notch groove

Claims (6)

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;
Each of the plurality of key guide portions and the plurality of keys is provided, and when the plurality of keys are pressed, a load due to frictional resistance is applied to the key that has been pressed. A plurality of load applying members ,
Each of the plurality of load applying members includes a support portion provided on one of the key guide portion and the key corresponding to the load applying member, and the key provided on the support portion to press the key. When operated, the key is elastically deformed according to the frictional resistance generated between the key pressed and the other one of the key guide portions corresponding thereto, and the load due to the frictional resistance accompanying the elastic deformation is reduced. A keyboard device, comprising: a frictional deformation portion that is applied to the key. The support portion is provided in the key guide portion in a state of being inserted into the key from the lower side, and the friction deforming portion is provided with first and second bent portions at the upper and lower portions of the support portion. The first and second arm portions provided in a state of extending obliquely upward via the first and second end portions of the first and second arm portions via third bent portions, respectively. stretched vertically, keyboard apparatus according to claim 1, characterized in that it comprises a friction arm that slides in contact with separable ready the inner surface of the key. The support portion is provided inside the key in a state of being inserted into the key guide portion from the upper side, and the friction deformation portion has first and second bent portions on the upper and lower portions of the support portion. The first and second arm portions provided in a state extending obliquely downward via the upper and lower ends of the first and second arm portions via the third bent portion, respectively. The keyboard device according to claim 1 , further comprising: a friction arm portion that is stretched over and is in contact with and slidable on an inner surface of the key guide portion. It said load applying member, when the friction deformable portion the key is depressed operation is elastically deformed, claims 1 to, characterized in that it comprises a deformation restricting portion for restricting the elastic deformation state 4. The keyboard device according to any one of 3 . Wherein between the key guide part and one said load applying member of the key, according to claim 1 to claim 4, characterized in that the lubricant having a viscosity is provided according to any one Keyboard device. 2. The key guide portion is formed integrally with the keyboard chassis, and the plurality of load applying members are formed integrally with either the key guide portion or the key. The keyboard device according to claim 5 .

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