JP2013210658A - Keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a satisfactory buffer function in termination of key touch by increasing of the contact area with a stopper part in a rotor and elasticity with a stopper contact part itself, and to suppress change of key touch termination positions due to use for multiple times to enhance durability.SOLUTION: A hammer has a hammer body 120 and a hammer holder. The hammer body 120 is energized counterclockwise centering on a support axis by weight of a weight part 123, a lower limit position is regulated by a fact that a rear side contact part 142 contacts a lower limit stopper, and an upper limit position is regulated by a fact that the hammer body 120 rotates clockwise to contact an upper side stopper body ST3. The rear side contact part 142 is constituted of resin having elasticity, provided by projecting to the side of the upper side stopper body ST3 at a free end of the hammer body 120, and width of the rear side contact part 142 in an alignment direction of the hammer is larger than the hammer body 120.

Description

  The present invention relates to a keyboard device in which a plurality of rotating bodies such as keys and hammers rotatably supported by a support member are rotated by a key pressing operation, and a rotation end position of the rotating body is regulated by a stopper portion.

  Conventionally, a plurality of rotating bodies such as keys and hammers supported by a support member so as to be rotatable about a rotation fulcrum are rotated by a key pressing operation, and the rotation end position of the rotating body is a stopper portion. There are known keyboard devices regulated by

  For example, in Patent Document 1 below, a hammer is rotatable at a front end portion of a key that is rotatable around a key fulcrum via a hammer rotation fulcrum, and the key is rotated in the key pressing direction by a key pressing operation. In conjunction with the movement, the free end of the hammer rotates upward. The key support frame, which is a support member, is provided with a stopper portion made of a felt material corresponding to a so-called key press stopper. Then, when the free end portion of the hammer comes into contact with the stopper portion, the forward movement rotation end position of the hammer is restricted and the key pressing end position is indirectly restricted.

  In this type of keyboard device, the key is in direct contact with the stopper portion or indirectly through a hammer or the like, thereby restricting the forward travel rotation end position of the key. The state directly affects the key press feel (touch). For example, if the stopper portion is too hard, the contact impact is large, that is, the kinetic energy of the rotating body is absorbed at a stroke, which is not good as a key pressing feeling. For this reason, in order to maintain a good buffering function at the end of the key pressing and to ensure a good key pressing feeling, the hardness of the stopper portion corresponding to the key pressing stopper is usually set to be soft.

Japanese Patent No. 2891080

  However, if the stopper portion is too soft, the amount of elastic deformation (sinking amount) of the stopper portion particularly when the key is strongly pressed increases. For this reason, if the drum is played for a long time and used many times, permanent deformation that cannot be restored increases, and the buffering capacity and the key pressing end position gradually change. In addition, since the degree differs depending on each key, not only the key pressing feeling for each key is not constant, but also the positions of the key pressing surfaces are not uniform and are not flush with each other. There is. In that sense, there is a problem that the durability of the stopper portion is low. In particular, when the hammer is made of a plate-like metal, only the narrow portion of the stopper portion with which the hammer comes into contact is deformed intensively, and this tendency becomes stronger.

  The first object of the present invention is to maintain a good buffering function at the end of key pressing and to increase the number of times by increasing the contact area of the rotating body with the stopper portion and the elasticity of the stopper contact portion itself. An object of the present invention is to provide a keyboard device that can improve the durability by suppressing the change in the key press end position due to use.

  A second object of the present invention is to provide a keyboard device capable of improving durability by suppressing the plurality of stopper portions from being individually separated even with a large number of impacts.

  In order to achieve the first object, a keyboard device according to a first aspect of the present invention includes a support member (101) having a rotation fulcrum portion (128), and a rotatable member about the rotation fulcrum portion. A plurality of rotating bodies (103) that are supported in parallel by the supporting member, have stopper abutting portions (142), and each rotate by a key pressing operation, and have elasticity and are fixed to the supporting member In addition, a plurality of the rotating bodies are arranged side by side in the longitudinal direction, and are brought into contact with the stopper contacting portions of the rotating bodies that rotate in the forward direction directly or indirectly, so that the forward travel of the rotating bodies A stopper portion (ST3) for cooperating and regulating the rotation end position, and the rotating body has a metal main portion (120) that is rotatable about the rotation fulcrum portion, The stopper abutting portion is made of an elastic resin, and the strut is a free end portion of the main portion. It protrudes into path portion side, and the width of the stopper contact portion in the alignment direction of the rotating body is equal to or larger than the main portion.

  Preferably, a plurality of ribs (146, 147) provided on the support member corresponding to positions between adjacent rotating bodies in the arrangement direction of the rotating bodies, the vicinity of the free ends of the rotating bodies to the The stopper contact portion is configured to slide between adjacent ribs.

  In order to achieve the first object, a keyboard device according to a third aspect of the present invention includes a support member (101) having a rotation fulcrum portion (128) and a rotation member that is rotatable about the rotation fulcrum portion. A plurality of rotating bodies (103) that are supported in parallel by the supporting member, have stopper abutting portions (142), and each rotate by a key pressing operation, and have elasticity and are fixed to the supporting member In addition, a plurality of the rotating bodies are arranged side by side in the longitudinal direction, and are brought into contact with the stopper contacting portions of the rotating bodies that rotate in the forward direction directly or indirectly, so that the forward travel of the rotating bodies A stopper portion (ST3) that cooperates and regulates the rotation end position, and the plurality of stopper portions are configured with their longitudinal elastic coefficients different from each other, and the rotating body includes the rotation fulcrum. A weight part (123) that is rotatable about the part, and the stopper contact part is Is a resin having a sex, a width of the stopper contact portion in the alignment direction of the rotating body is equal to or greater than the parts by weight.

  Preferably, the difference in the longitudinal elastic modulus of the plurality of stopper portions is different for each key range or for each key. For example, the difference in the longitudinal elastic modulus of the stopper portion is increased toward the lower sound range side (for example, the harder one is further hardened). Alternatively, the keyboard device is provided with a split function, the difference in the longitudinal elastic modulus is increased on the high-pitched sound side, and an after sensor is provided for the one having a higher longitudinal elastic modulus. The difference between soft touch and hard touch can be obtained simply by changing the method of different longitudinal elastic modulus.

  In order to achieve the second object, a keyboard device according to a fifth aspect of the present invention comprises a support member (4, 101) having a rotation fulcrum (P2, 128) and a rotation around the rotation fulcrum. A plurality of rotating bodies (2, 32, 103) that are supported in parallel by the support member, have stopper contact portions (2d, 32d, 142), and rotate by key pressing operations, and elastic A plurality of fixedly attached to the support member in the longitudinal direction of the rotating body, and abutting directly or indirectly against the stopper contact portion of the rotating body rotating in the forward direction. And a stopper portion (ST, ST2, ST3) that cooperates and regulates the forward travel rotation end position of the rotating body, and the plurality of stopper portions have their longitudinal elastic modulus. The struts are configured to be different from each other, and are disposed on the side farthest from the rotation fulcrum. The longitudinal elastic modulus of the pad portion (20) is lower than the longitudinal elastic modulus of the stopper portion (10) disposed on the side closer to the rotation fulcrum portion than the stopper portion disposed on the farthest side. Features.

  In order to achieve the second object, a keyboard device according to a sixth aspect of the present invention includes a support member and a drive unit, and each of the keyboard devices is supported in parallel by the support member in a rotatable manner by a key pressing operation. And a corresponding key, which has a driven portion and a stopper abutting portion and is supported in parallel by the support member so as to be rotatable about a rotation fulcrum portion. A plurality of hammer bodies each rotating about the rotation fulcrum portion by driving the driven portion by the driving portion, and having elasticity, and being fixed to the support member, the hammer A plurality of side-by-side arrangements in the longitudinal direction of the body and in a contact state in which the hammer body is in direct or indirect contact with the stopper contact portion of the hammer body rotating in the forward direction, the forward travel rotation end position of the hammer body And a plurality of stopper portions that vertically regulate the stopper portions. The longitudinal elastic coefficient of the stopper part (20) arranged with different sex coefficients and arranged on the farthest side from the turning fulcrum part is larger than that of the stopper part arranged on the farthest side. It is characterized by being lower than the longitudinal elastic modulus of the stopper part (10) disposed on the side close to the fulcrum part.

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

  According to the first aspect of the present invention, it is possible to maintain a good buffering function at the end of the key pressing by increasing the contact area of the rotating body with the stopper portion and the elasticity of the stopper contact portion itself. Durability can be improved by suppressing changes in the key press end position due to repeated use.

  According to the second aspect of the present invention, it is possible to suppress the lateral shake during rotation of the rotating body.

  According to the third aspect of the present invention, a good shock-absorbing function at the end of key pressing is maintained by increasing the contact area of the rotating body with the stopper portion and the elasticity of the stopper contact portion itself. Durability can be improved by suppressing changes in the key press end position due to repeated use.

  In addition, it is easy to realize a multipurpose and highly flexible keyboard device. For example, by making the longitudinal elastic coefficients of the stopper portions different from each other, it is possible to realize a soft or hard key pressing feeling while maintaining the same external shape. In addition, when controlling the tone by detecting the touch when the key is pressed after the key is pressed, a sensor for that purpose is placed inside the harder stopper, which provides durability and good after-touch sensing. The keyboard device is realized.

  According to the fourth aspect, key scaling of the key touch feeling is possible.

  According to the fifth aspect of the present invention, it is possible to maintain a good buffering function at the time of the end of the key press and to suppress the change of the key press end position due to the multiple use, thereby improving the durability.

  According to the sixth aspect of the present invention, in the keyboard device with a hammer body, while maintaining a good buffering function at the end of the key press, the change in the key press end position due to the multiple use is suppressed, thereby improving durability. Can be improved. In particular, the hammer body is more effective because it has a long moving distance.

It is a longitudinal cross-sectional view of the keyboard apparatus based on the 1st Embodiment of this invention. The right side view (figure (a)) which shows the structure of one upper side stopper body in 1st Embodiment, The right side which shows the structure of one upper side stopper body in the keyboard apparatus which concerns on the 2nd Embodiment of this invention It is a surface figure (figure (b)). FIG. 10 is a right side view of one upper stopper body and a corresponding hammer in a keyboard device according to a third embodiment of the present invention. It is sectional drawing of the keyboard apparatus which concerns on the 4th Embodiment of this invention. It is the perspective view which looked at the front-end | tip part of the hammer from diagonally downward. Sectional drawing of the rear part of the keyboard apparatus which concerns on the 5th Embodiment of this invention (FIG. (A)), The perspective view (FIG. (B)) which looked at one guide rib from diagonally downward, Guide rib and the free end part of a hammer It is a bottom view (figure (c)), and a figure (figure (d), (e)) showing typically a top view of a weight part of a hammer concerning a modification.

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

(First embodiment)
FIG. 1 is a longitudinal sectional view of a keyboard device according to a first embodiment of the present invention. The keyboard device according to the present embodiment is mainly composed of a keyboard chassis 4, a key 1, and a hammer 2 for providing a key press feeling like an acoustic piano by giving an appropriate inertia to a key pressing operation. Hammer 2 is provided corresponding to each key 1. The key 1 and the hammer 2 are arranged in parallel in the direction in which the keys 1 are arranged. The black key is configured in the same manner as the key 1 and is rotatably supported by the keyboard chassis 4. FIG. 1 shows a non-key-pressed state (a state where the key 1 is at the start position of the key-press stroke). Hereinafter, the player side (left side of the figure) of this apparatus is referred to as the front.

  The key 1 and the hammer 2 are configured to be pivotable in the vertical direction about the respective pivot fulcrums, that is, the key pivot shaft P1 and the hammer pivot shaft P2. The key 1 is configured to be able to drive the corresponding hammer 2, and the hammer 2 is configured to be able to drive the switch unit 3.

  The key 1 is provided with a convex spherical key fulcrum 1a projecting from one side surface of the rear end thereof. The center is the key rotation axis P1. On the other hand, a key support portion 5 is provided behind a substantially horizontal chassis horizontal portion 4 a of the keyboard chassis 4. A concave portion (not shown) corresponding to each key fulcrum portion 1a is provided in a portion of the key support portion 5 facing the key fulcrum portion 1a. The key fulcrum part 1a is engaged with the concave part of the key support part 5, and the key 1 is rotatable up and down around the key fulcrum part 1a (key rotation axis P1).

  A hammer driving piece 1b is provided at the front of the key 1 and hangs downward. A cushioning material 13 made of urethane rubber or the like is attached to the lower end portion of the hammer driving piece 1b. The cushioning material 13 is inserted between the upper extending portion 2 c and the lower extending portion 2 b of the hammer 2, transmits the pressing and releasing operation of the key 1 to the hammer 2, and uses the returning operation of the hammer 2 to the key 1. introduce. It should be noted that the upper end portion of the cushioning material 13 is always in contact with the upper extending portion 2c of the hammer 2 during the key pressing and key pressing return stroke to ensure the transmission of the operation.

  The keyboard chassis 4 is reinforced by connecting the chassis horizontal portion 4 a and the front portion 4 b of the keyboard chassis 4 with ribs 12. A key guide 6 for restricting the rotation in the key arrangement direction (the lateral direction of the key 1) projects from the chassis front portion 4b for each key 1. Under the frontmost part of the key 1, an over-deformation preventing stopper 14 is provided in the chassis front part 4b. When a much stronger force is applied to the key 1 than a normal key press, the lowermost portion of the foremost part of the key 1 comes into contact with the over-deformation preventing stopper 14 and the over-deformation of the key 1 is prevented.

  The hammer 2 is provided corresponding to each key 1, and the free end 2d of the support member 9 of the support member 9 provided on the keyboard chassis 4 rotates in the vertical direction around the hammer support portion 9a (hammer rotation axis P2). It is freely supported by the hammer fulcrum part 2a. Further, a fork-shaped spring 7 having a bifurcated shape on the front side is suspended from the vicinity of the hammer fulcrum portion 2a to the rear portion of the key 1. The spring 7 presses the key 1 against the key support portion 5 and presses the hammer 2 against the hammer support portion 9a of the support member 9 so that the key 1 and the hammer 2 do not easily fall off the keyboard chassis 4.

  The hammer 2 always urges the key 1 upward at the lower extending portion 2b by the weight of the mass member 2f which is a weight portion. The return force of the key 1 is not applied from the spring 7, but is due to the return force of the hammer 2 itself. The hammer 2 has a switch drive unit 2e for driving the switch unit 3 at the lower part.

  On the lower surface of the rear portion 4d of the keyboard chassis 4, an upper stopper body ST whose details will be described later with reference to FIG. A lower stopper 11 is provided on the chassis holding portion 4c. The upper stopper body ST comes into contact with the mass member 2f of the hammer 2 that rotates in the forward direction in conjunction with the key pressing operation, and the rotation end position of the key 1 and the hammer 2 (the lower limit position of the front end portion of the key 1 and the hammer is the key 1). 2 regulates the upper limit position of the free end 2d. The lower stopper 11 abuts against the mass member 2f of the hammer 2 when the key is not pressed, and restricts the upper limit position of the front end portion of the key 1.

  A switch board 8 is attached to the chassis front part 4 b, and the switch part 3 is provided on the switch board 8. The switch unit 3 is provided for each hammer 2 so as to face the switch driving unit 2 e of the hammer 2. The switch unit 3 is a contact time difference type two-make touch response switch, and detects the key pressing operation of the key 1 through the operation detection of the hammer 2.

  Fig.2 (a) is a right view which shows the structure of the one upper side stopper body ST in this Embodiment. The upper stopper body ST includes a front stopper portion 10 and a rear stopper portion 20 arranged in parallel in the front-rear direction, and further includes a base portion 25, a cover cloth 24, and a pressure sensor 26. The upper stopper body ST is configured, for example, for each predetermined key range obtained by dividing the entire key range into a plurality, and has a length corresponding to each key range. The upper stopper 10 may be configured in common for all keys, or may be configured for each key.

  When the pressure sensor 26 is used as a so-called after sensor for musical tone processing after a key is pressed, when the key range is divided into an accompaniment key range (low range) and a melody key range (high range), the melody portion Alternatively, the pressure sensor 26 may be provided only in the case. In this case, in order to make the stopper easy to sense, two types of the upper stopper body ST may be provided, and the configuration of the upper stopper body ST may be different between the accompaniment key area and the melody key area. In this case, the pressure sensor 26 may not be provided in the accompaniment key range.

  The front stopper portion 10 and the rear stopper portion 20 are fixed together by a base portion 25 on the lower surface of the rear portion 4 d of the keyboard chassis 4. That is, the upper stopper body ST unitized by fixing the front stopper portion 10 and the rear stopper portion 20 to the lower surface of the base portion 25 is fixed to the lower surface of the rear portion 4d. In this way, the front stopper portion 10 is disposed on the front side and the rear stopper portion 20 is disposed on the rear side along the longitudinal direction (front-rear direction) of the hammer 2. The rear stopper portion 20 has a three-layer structure, and includes a first layer 21, a second layer 22, and a third layer 23 in order from the upper side.

  The base portion 25 is composed of a cloth-like member having a uniform thickness. The front stopper portion 10 has a one-layer structure and is composed of a hard felt or the like. The first layer 21, the second layer 22, and the third layer 23 of the rear stopper portion 20 are made of, for example, hard felt, medium hard felt, and soft felt, respectively. The hardness is set in the order of hardness, that is, the front stopper portion 10> the first layer 21> the second layer 22> the third layer 23. Speaking of the longitudinal elastic modulus (elastic modulus), the front stopper portion 10 has the highest longitudinal elastic modulus and the third layer 23 has the lowest. This is achieved, for example, by varying the non-woven degree of each felt. The material itself is only an example, and the hardness may be set as described above. For example, urethane rubber or the like may be employed for the second layer 22, the third layer 23, and the like.

  The thickness of the rear stopper portion 20 including the first layer 21, the second layer 22, and the third layer 23 in the vertical direction is thicker than the front stopper portion 10 by a difference H1 and has a stepped shape. Specifically, the lower surface of the front stopper portion 10 is located between the lower surface of the second layer 22 and the lower surface of the third layer 23. The lower half portion of the front stopper portion 10 and the rear stopper portion 20 and the rear portion of the rear stopper portion 20 are configured to be covered with a single cover cloth 24 having a uniform thickness without any gaps, and end portions 24a, 24b is fixed to the lower surface of the rear portion 4d of the keyboard chassis 4 by bonding or the like. The end portions 24a and 24b may be wound around and fixed to the base portion 25 to form a unitized upper stopper body ST including the cover cloth 24, and this may be fixed to the lower surface of the rear portion 4d. . Of the cover cloth 24, the portion corresponding to the front stopper portion 10 is lower than the portion corresponding to the rear stopper portion 20 by the difference H1. The upper end of the free end portion 2d of the hammer 2 is straight along the longitudinal direction, and is parallel to the lower surface of the front stopper portion 10 and the lower surface of the rear stopper portion 20 when the rotation is finished. .

  By the way, the free end 2d of the hammer 2 actually contacts the lower surface of the cover cloth 24, but the free end 2d is in the cover cloth 24 corresponding to the front stopper portion 10 and the rear stopper portion 20. By contacting, the front side stopper part 10 and the rear side stopper part 20 will be in a contact state indirectly. Therefore, hereinafter, unless otherwise specified, the expression “the free end portion 2d is in contact with the front stopper portion 10 and the rear stopper portion 20” means “the free end portion 2d is placed on the front side through the cover cloth 24”. It shall mean “abut against the stopper 10 and the rear stopper 20”.

  The first layer 21 and the second layer 22, and the second layer 22 and the third layer 23 are all bonded and fixed with a soft adhesive or the like. Further, the front surfaces of the first layer 21, the second layer 22, and the third layer 23 and the rear surface of the front stopper portion 10 are similarly bonded and fixed. Further, between the base portion 25 and the first layer 21 of the front stopper portion 10 and the rear stopper portion 20, and between the cover cloth 24 and the front stopper portion 10 and the rear stopper portion 20, similarly, a soft adhesive or the like. It is fixed with adhesive.

  When a compressive stress corresponding to the elastic limit is applied, the third layer 23 contracts by the strain amount L1 shown in FIG. Therefore, when the elastic deformation is smaller than the strain amount L1, it can be restored to the original shape (shape when not in contact) if the load is removed. Incidentally, the limit lower surface position Q1 is the lower surface position of the third layer 23 when it is assumed that only the third layer 23 is contracted by the strain amount L1. When the free end 2d of the hammer 2 abuts, the first layer 21 and the second layer 22 actually contract, so that a third stress when a compressive stress corresponding to the elastic limit of the third layer 23 is applied. The lower surface position of the layer 23 is a position further above the limit lower surface position Q1.

  The pressure sensor 26 detects the operation of the key 1 through the detection of the operation of the hammer 2, and is arranged between the upper portion of the front stopper portion 10 and the lower surface of the base portion 25 for each hammer 2. Established. A detection circuit 27 is provided on the upper surface of the rear portion 4d of the keyboard chassis 4 to save space. The pressure sensor 26 may be provided in place of the switch unit 3, but may be provided together with the switch unit 3 and may employ either or both detection results.

  The pressure sensor 26 is made of a two-layer or three-layer film having a thickness of about 0.5 to 1 mm, and fine granular materials are interposed between the layers. And the said granular material receives a pressure via the front side stopper part 10, and the pressure is detected when the contact area between films becomes large. The configuration of the pressure sensor 26 is not limited to this. Note that a switch for detecting the operation of the hammer 2 may be provided above the rear stopper portion 20 so as to be arranged in parallel with the pressure sensor 26.

  The pressure sensor 26 may be provided on the upper portion of the first layer 21 of the rear stopper portion 20, but detection sensitivity is improved by providing the pressure sensor 26 on the upper portion of the front stopper portion 10 which is harder and has better power transmission efficiency. This increases the detection accuracy. Conventionally, even if a pressure sensor is provided on the key stopper, it is difficult to produce a product because the key stopper is soft and not durable. However, in the present embodiment, since a hard material can be used for the front stopper portion 10, the elastic deformation amount is small, and the pressure sensor 26 is always protected by the front stopper portion 10. The durability of the pressure sensor 26 can be increased.

  The upper stopper body ST is manufactured and attached for each key range. First, the 1st layer 21, the 2nd layer 22, and the 3rd layer 23 are bonded and fixed, the back side stopper part 20 is manufactured, and the back side stopper part 20 and the front side stopper part 10 are bonded and fixed. Then, these bonded and fixed ones are bonded and fixed to the lower surface of the base portion 25 so as to be one unit. Then, the upper surface of the base portion 25 is bonded and fixed to the lower surface of the rear portion 4d of the keyboard chassis 4 with a double-sided tape or the like. Finally, the cover cloth 24 is covered with a gap so as to cover the exposed surface from below the front stopper portion 10 and the rear stopper portion 20 without any gap, and the rear end of the cover cloth 24 is fixed to the rear portion 4d. The front end is fixed to the lower surface of the key support portion 5.

  In this configuration, when the key 1 is depressed, the hammer 2 is driven by the hammer driving piece 1b of the key 1 and rotates in the forward direction (the direction in which the free end 2d rises). Then, in the forward travel of the rotation, the free end portion 2d of the hammer 2 is first brought into contact with the rear stopper portion 20, and after the kinetic energy of the hammer 2 is reduced, the free end portion 2d is brought into contact with the front stopper portion 10. It becomes. Then, when the front side stopper portion 10 is distorted and all the kinetic energy of the hammer 2 is absorbed, the hammer 2 is brought into a rotation end state. Accordingly, the rotation end position of the hammer 2 is regulated by the cooperation of the front stopper portion 10 and the rear stopper portion 20.

  Here, the lower surface position of the front stopper portion 10 due to the elastic deformation of the front stopper portion 10 when the key is pressed with the normally assumed maximum key pressing strength is defined as Q2 (see FIG. 2A). The lower surface position Q2 can be set much lower than the lower surface position when a compressive stress corresponding to the elastic limit is applied to the front stopper portion 10. The lower surface position Q2 is set to be lower than the above-described limit lower surface position Q1 of the rear stopper portion 20. Therefore, in a normal performance, both the front stopper portion 10 and the rear stopper portion 20 are always elastically deformed without receiving a stress exceeding the elastic limit, and are distorted within a range that can be restored to the original shape.

  Here, the speed at the beginning of contact with the rear stopper portion 20 of the hammer 2 is high, and usually the impact is large. However, since the third layer 23 of the rear stopper portion 20 is particularly soft, the buffering function is sufficiently fulfilled. On the other hand, the front stopper portion 10 is hard, and the hammer 2 is brought into contact with the front stopper portion 10 by the stepwise contact with which the hammer 2 contacts the rear stopper portion 20 in advance. Kinetic energy is decreasing. Therefore, the front stopper 10 sinks due to contact, that is, elastic deformation is small, and the front stopper 10 is distorted with a sufficient remaining force. As a result, even if the contact is repeated many times, the front stopper portion 10 is less likely to be permanently deformed, which is a so-called “sag”.

  Incidentally, if the upper stopper body ST has a single configuration corresponding to the front stopper portion 10 rather than the front stopper portion 10 and the rear stopper portion 20 arranged side by side, the single stopper portion has three layers. It is conceivable to form a multi-layer structure. However, even in such a case, the layer on the side close to the hammer 2 is compressed to near the limit where it can be elastically deformed and is crushed, so improvement in durability cannot be expected. In the present embodiment, the two stopper portions having different hardnesses are arranged side by side without being compressed until they cannot be restored to the original shape, and the amount of elastic deformation of each is suppressed, resulting in high durability. Yes.

  A difference H1 that is a step between the front stopper portion 10 and the rear stopper portion 20 is set to be smaller as the corresponding sound range is higher. For example, it is different for each of the divided predetermined key ranges or for each key. Alternatively, it may be varied according to the weight of the hammer 2. That is, for example, when three types of hammers 2 are provided and the weight of the hammers 2 is set in three stages of “heavy”, “medium”, and “light” from the low frequency side, the difference H1 is low. From the sound range side, “0 mm”, “1 mm”, and “2 mm” are set. As a result, key scaling of the key depression feeling is realized.

  By the way, the distance between the lower surface position of the rear stopper portion 20 in the original shape and the lower surface position Q2 of the front stopper portion 10 is the key depression end position in the over-deformation prevention stopper 14 (see FIG. 1) and the normal key depression. It is configured to be equal to a value obtained by multiplying the distance from the lowermost front portion of the key 1 by the lever ratio of the hammer 2. As a result, when a force exceeding the normally assumed maximum key pressing strength is applied, such as when a child is placed on the keyboard, the lowermost front part of the key 1 comes into contact with the over-deformation preventing stopper 14 and the key 1 Is prevented from over-deformation. As described above, the three constituent elements of the rear stopper portion 20, the front stopper portion 10, and the excessive deformation prevention stopper 14 function as a three-stage safety mechanism.

  According to the present embodiment, the hammer 2 is configured to be in contact with the rear stopper portion 20 and the front stopper portion 10 in a stepwise manner, and the third of the rear stopper portion 20 is more than the front stopper portion 10. The layer 23 has a lower longitudinal elastic modulus. In addition, during the rotation travel of the hammer 2, the hammer 2 contacts the front stopper 10 when the rear stopper 20 is in a deformed state that can be restored to its original shape after releasing the contact with the hammer 2. I was in a state. As a result, it is possible to maintain a good buffering function at the end of the key press and suppress a change in the key press end position due to multiple use, thereby improving the durability of the upper stopper body ST.

  In particular, since the rear stopper portion 20 that is in a contact state first is disposed on the side farther from the hammer rotation shaft P2 than the front stopper portion 10, the portion with the higher speed of the hammer 2 is in the first contact state. It becomes. Thereby, since the kinetic energy of the hammer 2 can be efficiently reduced before the hammer 2 comes into contact with the front stopper portion 10, the elastic deformation of the front stopper portion 10 is small and permanent. It is effective for suppressing deformation. Also, the overall mechanical noise can be reduced.

  Further, since the pressure sensor 26 is provided on the upper portion of the hard front stopper portion 10, it is possible to maintain high durability and detection accuracy, save space, and detect a key pressing operation.

  In the present embodiment, the front stopper portion 10 and the rear stopper portion 20 are arranged in parallel, but three or more stopper portions that can be in contact with the hammer 2 are provided in parallel. May be. In that case, it is only necessary to set the hardness of the stopper portion that is in the first contact state softer than that of the stopper portion that is not initially in the contact state.

  Although the rear stopper portion 20 has a three-layer structure, it is not limited to this and may be two layers or four or more layers. Or you may comprise by the single layer softer than the front side stopper part 10. FIG.

  Note that not only the rear stopper portion 20 but also the front stopper portion 10 may have a multilayer structure of two or more layers. In that case, the setting of the hardness of the front stopper portion 10 and the rear stopper portion 20 is a comparison of the softest layers among the layers of the stopper portions, and the softest layer of the rear stopper portions 20 Also, the softest layer of the front stopper portion 10 may be made harder.

(Second Embodiment)
FIG.2 (b) is a right view which shows the structure of the one upper side stopper body in the keyboard apparatus based on the 2nd Embodiment of this invention.

  In the present embodiment, only the configuration of the upper stopper body is different from that of the first embodiment, and the other configurations are the same. In the upper stopper body ST2 in the present embodiment, as shown in FIG. 2B, the rear stopper portion 20 has a three-layer structure, but the lower surface of the third layer 23 is flush with the lower surface of the front stopper portion 10. This is different from the first embodiment. Further, in the upper stopper body ST2, a wedge-shaped common layer 28 that is integrally formed is provided on the lower surface of the third layer 23 and the lower surface of the front stopper portion 10.

  The common layer 28 is made of the same material as the third layer 23 and has the same longitudinal elastic modulus. Note that a material having a longitudinal elastic modulus lower than that of the third layer 23 may be adopted as the material of the common layer 28. The thickness of the common layer 28 in the vertical direction increases toward the rear.

  In order to manufacture and attach the upper stopper body ST2, first, similarly to the first embodiment, the rear stopper portion 20 and the front stopper portion 10 are bonded and fixed to the lower surface of the base portion 25. Thereafter, the common layer 28 is bonded and fixed to the lower surface of the third layer 23 and the lower surface of the front stopper portion 10 so as to form a unit. By the base portion 25 and the common layer 28, the front stopper portion 10 and the rear stopper portion 20 are sandwiched so that they are firmly connected in the upper and lower sides and integrated.

  Then, the upper surface of the base portion 25 of the unitary unit is bonded and fixed to the lower surface of the rear portion 4d of the keyboard chassis 4 with a double-sided tape or the like. Finally, from below the common layer 28, the cover cloth 24 is covered with a gap so as to cover the exposed surface of the one lump, and the rear end of the cover cloth 24 is fixed to the rear portion 4d. Is fixed to the lower surface of the key support portion 5.

  In such a configuration, since the common layer 28 is thicker toward the rear, when the hammer 2 rotates in the forward direction, the hammer 2 abuts from the rear end side of the lower surface of the common layer 28. Moreover, since the common layer 28 is as soft as the third layer 23, the operation is the same as that of the first embodiment. That is, the portion of the common layer 28 corresponding to the front stopper portion 10 is thin, and the front stopper portion 10 has sufficient hardness than the common layer 28, and therefore corresponds to the front stopper portion 10 of the common layer 28. The portion does not significantly affect the contact state between the front stopper portion 10 and the hammer 2, and the operation can be almost ignored. Therefore, the clear contact of the front end does not occur as in the first embodiment, but the rear stopper portion 20 is substantially in contact with the front stopper portion 10 before the front stopper portion 10.

  The key scaling of the key press feeling in the present embodiment is realized by setting the thickness of the common layer 28. For example, the thickness of the common layer 28 is made different for each of the divided predetermined key ranges or for each key. Alternatively, it may be varied according to the weight of the hammer 2. The thickness of the common layer 28 is reduced as the corresponding sound range is higher. In this case, the positions of the lower surface of the third layer 23 and the lower surface of the front stopper portion 10 are common to all keys, and the inclination angle of the lower surface of the common layer 28 is common to all keys. Therefore, if the thickness of the front end portion of the common layer 28 is H2, the thickness of the rear end portion of the common layer 28 increases or decreases in conjunction with the increase / decrease amount of the thickness H2.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained. In addition, the base portion 25 and the common layer 28 integrally form each of the front stopper portion 10 and the rear stopper portion 20, so that even when subjected to a large number of impacts, they are separated. This can be suppressed and the durability can be improved.

(Third embodiment)
FIG. 3 is a right side view of one upper stopper body and a corresponding hammer in the keyboard device according to the third embodiment of the present invention.

  In the present embodiment, only the configurations of the upper stopper body and the hammer are different from those of the first embodiment, and the other configurations are the same. In the present embodiment, an upper stopper body ST3 and a hammer 32 are provided in place of the upper stopper body ST and the hammer 2 with respect to the first embodiment.

  As shown in FIG. 3, the upper stopper body ST3 corresponds to the upper stopper body ST2 (see FIG. 2B) in the second embodiment except the common layer 28, and the lower surface of the third layer 23. A cover cloth 24 is directly attached to the lower surface of the front stopper portion 10. Accordingly, the lower surfaces of the front stopper portion 10 and the rear stopper portion 20 are flush with each other and have no step. The structure of other parts is the same as that of the upper stopper body ST2.

  On the other hand, the hammer 32 is different from the hammer 2 in the first and second embodiments only in that a rear abutting portion 29 made of a resin is provided so as to protrude, and is otherwise the same as the hammer 2. A through hole 31 penetrating in the vertical direction is formed in the rod-shaped portion on the upper side of the free end portion 32 d of the hammer 32. The rear abutting portion 29 is provided at the free end portion 32d by outsert molding, and is prevented from coming off by providing a raised portion 29a on which the resin swells also below the through hole 31.

  The upper end of the rear contact portion 29 is parallel to the upper end of the free end portion 32d, and protrudes upward by H3 from the upper end of the free end portion 32d. This protrusion amount H3 is approximately the same as the above-described difference H1 (see FIG. 2A). The rear contact portion 29 is made of, for example, urethane rubber or the like, and has a hardness (longitudinal elastic modulus) in the range from the third layer 23 to the second layer 22. The position of the rear contact portion 29 in the front-rear direction is set so as to just contact the rear stopper portion 20 when contacting the upper stopper body ST2. Further, a portion of the free end portion 32d that is in front of the rear contact portion 29 functions as a front contact portion 30 that just contacts the front stopper portion 10.

  In such a configuration, when the hammer 32 is rotated in the forward direction by the key pressing operation of the key 1, the rear contact portion 29 protrudes, so that the rear contact portion 29 first contacts the rear stopper portion 20. After the contact state is reached and the kinetic energy of the hammer 32 is reduced, the front contact portion 30 is in contact with the front stopper portion 10. Then, when the front side stopper portion 10 is distorted and all the kinetic energy of the hammer 32 is absorbed, the hammer 32 is brought into a rotation end state. That is, the action by the contact is substantially the same as in the first embodiment.

  However, since the soft elastic parts are separated from each other (in the third layer 23 and the rear contact part 29), the energy diffusion distribution according to the collision theory is different from that of the first embodiment. Compared to the type in which the portion is concentrated on only one side (first and second embodiments), it is advantageous in terms of improving the durability.

  According to the present embodiment, at least the same effects as those of the first embodiment can be obtained.

  In addition, in the first embodiment, the level of deviation of the front and rear and the contact timing at which the hammers 2 and 32 are brought into contact with the front stopper portion 10 and the rear stopper portion 20 is provided with steps in both stopper portions. In the third embodiment, this is realized by providing a step on the hammer. However, instead of adopting only one of them, both may be applied to generate an appropriate contact timing difference.

(Fourth embodiment)
FIG. 4 is a cross-sectional view of a keyboard apparatus according to the fourth embodiment of the present invention. In the figure, the right side is the front.

  As shown in FIG. 4, a bottom plate 105 is provided at the bottom of the keyboard chassis 101. A front cover portion 106 corresponding to the front end portion of the key 102 is formed on the front end portion of the keyboard chassis 101 so as to protrude above the keyboard chassis 101 from the bottom side. On the middle step 107 at the rear of the front cover 106, a key guide 108 for preventing the key 102 from swinging is provided so as to protrude upward.

  A rising portion 110 is formed on the front side of the intermediate portion of the keyboard chassis 101 at a substantially intermediate height between the front cover portion 106 and the middle step portion 107, and from the upper end portion of the rising portion 110 to the keyboard chassis. A placement portion 111 is formed substantially along the horizontal direction across the rear end portion of the 101. A switch substrate 112 is attached to the upper surface of the intermediate portion of the mounting portion 111, and a rubber switch 104 is provided on the switch substrate 112. Further, a key support portion 113 is formed on the upper surface of the rear end portion (left end portion in FIG. 4) of the placement portion 111, and the rear end portion of the key 102 is rotated on the key support portion 113. A key support shaft 114 is provided to protrude in the key arrangement direction for support.

  As shown in FIG. 4, the key 102 has key attachment holes 115 formed on both side surfaces of the rear end portion (the left end portion in the figure), and the key attachment holes 115 are formed on the key support portion 113 of the keyboard chassis 101. It is attached to the key support shaft 114 so as to be pivotable, and is thereby configured to pivot up and down about the key support shaft 114. On the rear side of the intermediate portion of the key 102, a switch pressing portion 116 is formed corresponding to the rubber switch 104 of the switch board 112 provided on the keyboard chassis 101. The front side of the switch pressing portion 116 The hammer connecting portion 117 for connecting and holding the hammer contact portion 126 formed at the front end portion (right end portion in FIG. 4) of the hammer 103 extends downward along the rising portion 110 of the keyboard chassis 101. Has been.

  On the other hand, as shown in FIG. 4, the hammer 103 has a metal hammer body 120 and a synthetic resin hammer holder 121, and the hammer holder 121 is attached to a substantially intermediate portion of the hammer body 120. In this state, the hammer holder 121 is configured to be rotatably supported by a hammer support portion 122 provided on the front lower surface of the placement portion 111 of the keyboard chassis 101. A weight portion 123 which is a weight portion is provided at the rear end portion (left end portion in FIG. 4) of the hammer body 120. A key press indicator 150 is disposed on the upper surface of the front portion of the keyboard chassis 101 (behind the middle step 107). The key press indicator 150 is provided with an LED 151 via a holding unit.

  FIG. 5 is a perspective view of the tip of the hammer 103 as viewed obliquely from below. As shown in FIG. 5, the resin portion 141 is coated on the tip portion of the weight portion 123. The weight portion 123 itself has the same width up to the tip, but particularly at the forefront of the weight portion 123, the thickness of the resin portion 141 in the key arrangement direction is particularly thick, whereby a wide rear contact portion. 142 is formed. Further, as shown in FIG. 4, the rear contact portion 142 also protrudes upward. The rear abutment portion 142 corresponds to the rear abutment portion 29 (see FIG. 3) in the third embodiment, is made of the same material, and has the same upward protrusion. . The action when the rear contact portion 142 and the front contact portion 141a, which is the front portion of the weight portion 123, is in contact with the upper stopper body ST3 is such that the rear contact portion 142 is wider. Except for this, it is the same as the third embodiment.

  The hammer body 120 is urged counterclockwise in FIG. 4 by the weight of the weight portion 123, and in a non-key-pressed state, the hammer main body 120 is rearward of a lower limit stopper 124 such as a felt arranged on the bottom plate portion 105 of the keyboard chassis 101. When the contact portion 142 contacts, the lower limit position of the hammer body 120 is regulated (solid line in FIG. 4). Further, an upper stopper body ST3 similar to that in the third embodiment is disposed on the lower surface of the rear end of the placement portion 111 of the keyboard chassis 101. The hammer body 120 is configured such that the upper limit position of the hammer body 120 is regulated by rotating clockwise (forward) against the weight of the weight portion 123 and contacting the upper stopper body ST3. (Two-dot chain line in FIG. 4).

  As shown in FIG. 4, the hammer body 120 has a front end protruding forward of the rising portion 110 through an opening 110a provided in the rising portion 110 of the keyboard chassis 101, and a hammer contact with the protruding tip portion. A portion 126 is provided, and the hammer contact portion 126 is held by the hammer connecting portion 117 of the key 102, whereby the hammer body 120 is configured to be interlocked with the key pressing operation of the key 102. The hammer contact portion 126 is formed in a substantially spherical shape from a synthetic resin, and has a configuration in which a large number of dimple-like recesses 26a for collecting grease are provided on the surface thereof.

  As shown in FIG. 4, the hammer connecting portion 117 of the key 102 that holds the hammer contact portion 126 has a cylindrical portion 127 formed substantially horizontally in the front-rear direction. The cylindrical portion 127 is formed in a circular cylindrical shape having the same cross-sectional shape as that of the hammer contact portion 126. Accordingly, the hammer contact portion 126 is configured to slide on the inner surface of the cylindrical portion 127 in a ring-shaped line contact state.

  As shown in FIG. 4, the hammer holder 121 includes a bearing portion 130 that is rotatably held by the support shaft 128 in a state in which the support shaft 128 of the hammer support portion 122 is inserted, and the bearing portion 130 is integrated. A mounting portion 131 that is detachably mounted on the hammer body 120 and that is detachably locked to a surface along the longitudinal direction of the hammer body 120 to position the mounting portion 131 relative to the hammer body 120. The portion 132 and an elastic portion 134 that elastically deforms in the longitudinal direction of the hammer body 120 by elastically contacting the hammer body 120.

  In the non-key-pressed state, the rear contact portion 142, which is the rear end portion of the hammer 103, contacts the lower limit stopper 124 so that the hammer 103 is restricted to the lower limit position, and the hammer contact portion 126 of the hammer body 120 is The hammer contact portion 126 is positioned at the upper limit in a state in which it is movably inserted and held in the cylindrical portion 127 of the hammer connecting portion 117 of the key 102. Thereby, the key 102 is pushed up by the hammer contact portion 126, and the key 102 is restricted to the upper limit position.

  When the key 102 is pressed, the key 102 rotates clockwise in FIG. 4 about the key support shaft 114 at the rear end, and the hammer contact of the hammer main body 120 inserted into the cylindrical portion 127 of the hammer connecting portion 117 is achieved. The part 126 is pushed down.

  Along with this, the hammer main body 120 rotates clockwise around the support shaft 128 while the hammer contact portion 126 slides in the cylindrical portion 127 of the hammer connecting portion 117. At this time, an action load corresponding to the weight of the weight portion 123 of the hammer body 120 is applied to the key 102, so that a key touch feeling similar to that of an acoustic piano can be obtained. When the key is released, the hammer 103 rotates counterclockwise due to the weight of the weight portion 123 of the hammer body 120 and returns to the initial position.

  As shown in FIGS. 4 and 5, a guide rib 146 is formed integrally with the keyboard chassis 101 at the rear inner side of the keyboard chassis 101 corresponding to the position between the adjacent hammers 103. The guide rib 146 is formed from the upper end to the lower end of the keyboard chassis 101. On the other hand, the rear contact portion 142 of the hammer 103 is disposed so as to be interposed between the adjacent guide ribs 146 in the entire rotation process.

  Here, as shown in FIG. 5, in the key arrangement direction, the width of the weight portion 123 is D0, the width of the rear contact portion 142 is D1, the distance between adjacent guide ribs 146 is D2, and the width of the guide ribs 146 is D4. And The width D1 is sufficiently larger than the width D0 (+1 mm on both sides and 2 mm or more in total), and the width D1 is set to be larger than twice the width D4. Further, the width D1 is substantially equal to the distance D2, and the distance D2 is set slightly larger (0.2 to 2.0 mm) than the width D1. Further, on both side surfaces 142a of the rear contact portion 142, dimple-like concave portions 142aa for grease accumulation are formed. The recess 142aa is provided with low viscosity grease.

  Therefore, when the hammer 103 rotates, the side surface 142a of the rear contact portion 142 slides smoothly between the adjacent guide ribs 146. In addition, since the rear contact portion 142 is wide, the contact area with the rear stopper portion 20 is increased as compared with the case where the portion coated only on the weight portion 123 having the width D0 is used as the contact portion. Can do.

  The resin portion 141 including the rear contact portion 142 is attached to the hammer body 120 by outsert molding together with the hammer contact portion 126. Both can be molded in the same molding process using the same material. Incidentally, as shown in FIG. 4, the weight portion 123 is formed with recesses 143, 144, 145 penetrating in the key arrangement direction. These are formed when the hammer body 120 is punched. The recesses 143, 144, and 145 have surfaces that face the direction of receiving an impact by contact, and are provided to firmly hold the resin portion 141 so that the resin portion 141 does not come off against a strong impact. .

  The action when the hammer 103 abuts on the upper stopper body ST3 is the same as that of the third embodiment. Further, since the rear contact portion 142 is wide, the impact at the time of initial contact with the upper stopper body ST3 can be more effectively reduced, and the amount of elastic deformation of the front stopper portion 10 can be reduced. To do.

  By the way, the resin part 141 including the rear contact part 142 has various functions. First, when the hammer main body 120 is formed by metal punching, burrs are generated on the side in the punching direction, but the burrs are hidden by the coating effect of the resin part 141, and the upper stopper body ST3 is protected. Further, since the rear contact portion 142 itself protrudes upward and is itself soft, a buffering function by the hammer side configuration similar to that of the third embodiment is achieved. Further, since the rear contact portion 142 is wider than the hammer body 120, the buffering function can be enhanced by increasing the contact area with the rear stopper portion 20 of the upper stopper body ST3. In addition, since the rear abutting portion 142 is widened and the both side surfaces 142a are guided by sliding between the adjacent guide ribs 146, the rear abutting portion 142 is made to have a wide shape. It can be used as a core (core) of the mass concentrating part of the member, and at the same time, a guided function that suppresses lateral shake when the hammer 103 is rotated is also achieved.

  Further mentioning the point of mass concentration, the hammer 103 is made of a heavy material such as metal (iron) or ceramic, and the foremost portion of its free end is made wide so that the mass concentration position of the free end is Can be close to the forefront. As a result, it is possible to realize a lighter keyboard device when obtaining a heavy touch feeling as in the initial strong key depression of an acoustic piano.

  In addition, when the keyboard unit is in a posture in which the keyboard unit is in a lower position when the keyboard device is being transported or the like, conventionally, the free end of the hammer body 120 may be deformed by swinging in the lateral direction. However, in the present embodiment, such a fear is reduced by the guide function by the guide rib 146.

  According to this embodiment, the same effect as that of the third embodiment can be obtained. Furthermore, since the rear abutment portion 142 is wide, the effect of maintaining a good buffering function at the end of the key press and suppressing the change in the key press end position due to multiple use is further expanded. Can do.

(Fifth embodiment)
FIG. 6A is a cross-sectional view of the rear part of the keyboard device according to the fifth embodiment of the present invention. In the present embodiment, instead of the guide rib 146 in the fourth embodiment, the guide rib 147 is intensively provided at a predetermined position in the front-rear direction. By providing the guide rib 147, the mass concentration portion is changed. Furthermore, it can be brought in the tip direction. Other configurations are the same.

  The guide rib 147 is formed integrally with the keyboard chassis 101 corresponding to the position between the adjacent hammers 103. The guide rib 147 is formed from the upper end to the lower end of the keyboard chassis 101 in the vicinity of the front end of the resin portion 141 in the front-rear direction.

  FIG. 6B is a perspective view of one guide rib 147 as viewed obliquely from below, and FIG. 6C is a bottom view of the guide rib 147 and the free ends of the hammer 103.

  The guide rib 147 has an arm portion 147a extending in both the left and right directions, and is formed in a cross shape in a bottom view. A chamfered portion 147b that is chamfered so as to have a tapered taper is formed at the lower ends of both the arm portions 147a. Is formed (see FIGS. 6A and 6B). The chamfered portion 147b is in contact with the triangular columnar protrusion 105a. That is, when the keyboard chassis 101 and the bottom plate portion 105 are assembled in the approaching direction by screwing screws 152 and 153 (see FIG. 4), the chamfered portion 147b that is a tapered surface and the triangular columnar protrusion that is the corresponding tapered surface. 105a is automatically aligned, and the keyboard chassis 101 and the bottom plate portion 105 are appropriately assembled.

  Of the weight portion 123 of the hammer 103, the portion where the resin portion 141 is coated, and the front portion (near the support shaft 128) of the rear contact portion 142 is between the arm portions 147 a of the adjacent guide ribs 147. It arrange | positions so that it may interpose in the whole process of rotation. The sliding relationship between the resin portion 141 and the arm portion 147a is the same as the sliding relationship between the rear contact portion 142 and the guide rib 146 in the fourth embodiment.

  According to the present embodiment, with respect to the fourth embodiment, the same effects as the fourth embodiment except that the resin portion 141 performs a guided function instead of the rear contact portion 142. Can be played. That is, since only the vertical surface 147aa (see FIGS. 6B and 6C) which is the left and right side surfaces of the arm portion 147a can be used as the guide surface of the hammer 103, the tip side of the arm portion 147a (FIG. 6). The space in the key arrangement direction on the arrow F1 side shown in (b) can be used effectively. The mass of the hammer 103 can be concentrated on this portion. In the example of FIGS. 6A to 6C, a part of the tip is widened to form the rear contact portion 142. However, the present invention is not limited to this, and the entire tip side (arrow F1 side) from the arm portion 147a. It is also possible to make it a wide part for forming the mass concentration part.

  In such a case, the rear contact portion 142, which is the wide portion of the hammer 103, can take the full width of the adjacent wide portion, so that it is possible to further increase the degree of mass concentration at the tip portion. In order to increase the degree of mass concentration on the tip, it is desirable that the tip be wide and the contact area with the upper stopper body ST3 be large, and it is desirable to be able to manufacture as easily as possible. For this purpose, for example, a configuration as shown in FIGS. 6D and 6E may be adopted.

  6D and 6E are diagrams schematically showing a plan view of the weight portion 123 of the hammer 103 according to the modification. As shown in (d) / (e) of the figure, the tip end portion of the weight portion 123 is formed into a waveform in which the key arrangement direction / front-rear direction is an amplitude direction by press fracture or the like, The contact portion 142 is provided by outsert molding. In this way, it is possible to easily manufacture the hammer 103 whose mass is concentrated at the tip.

  In the fourth and fifth embodiments, only the effect of achieving a buffering function between the rear stopper portion 20 of the upper stopper body ST3 and the hammer 103 by the elasticity of the rear contact portion 142 itself, The front stopper portion 10 may be eliminated.

  In each of the above embodiments, the softest layers of the front stopper portion 10 and the rear stopper portion 20 are limited to the viewpoint of reducing the initial impact of contact between the hammer 2 and the upper stopper body ST. It is also possible to adopt a configuration in which the same hardness is adopted. Also by this, the effect of suppressing the permanent deformation of the front side stopper portion 10 is obtained.

  Although the effect is somewhat inferior, in each of the above embodiments, the arrangement of the front stopper portion 10 and the rear stopper portion 20 may be reversed in the upper stopper body ST or the like. In that case, in the third to fifth embodiments, the positions of the rear contact portion 29 and the rear contact portion 142 (see FIGS. 3 and 4) of the hammers 32 and 103 are also moved forward accordingly. It will be.

  In each of the above embodiments, the configuration in which two or more stopper portions are arranged side by side, such as the upper stopper body ST, can be applied to the lower stoppers 11 and 124 (see FIGS. 1 and 4). Good.

  In each of the above embodiments, the cover cloth 24 is not essential, and the hammers 2, 32, 103 may be in direct contact with the upper stopper body ST or the like.

  In each of the above-described embodiments, the hammers 2, 32, and 103 are configured such that the rear is rotated as a free end. However, the present invention is not limited to this, and a form in which a free end is provided at the front. However, the present invention is applicable.

  In addition, although the hammers 2, 32, and 103 rotated by the keys 1 and 102 are illustrated as the rotating members, the present invention is not limited to this, and the keys 1 and 102 may be used. In other words, the present invention can be applied as long as it is a rotating body that is rotated by a key pressing operation and is in contact with the upper stopper body ST or the like and the rotation end position is restricted. Therefore, for example, the present invention is also applied to the hammer 2 when the hammer 2 is rotated by the key 1 via another member. Further, the turning direction of the rotating body is not limited to the configuration in which the free end is raised, and may be a structure in which the rotating end is lowered. In this case, the upper stopper body ST is provided on the lower side of the chassis. Become.

  4, 101 Keyboard chassis (support member), 2, 32, 103 Hammer (rotating body), 10 Front stopper part (second stopper part), 20 Rear stopper part (first stopper part), 29 Rear contact part , 30, 141a Front contact part, 120 Hammer body (main part), 128 Support shaft (rotation fulcrum part), 142 Rear contact part (stopper contact part), 146, 147 guide rib, P2 hammer rotation shaft (Rotating fulcrum part), ST, ST2, ST3 Upper stopper body (stopper part), 123 (weight part) weight part, 2d, 32d Free end part (stopper contact part)

Claims (6)

A support member having a pivot point;
A plurality of rotating bodies that are supported in parallel by the support member so as to be rotatable about the rotation fulcrum, have stopper contact portions, and each rotate by a key pressing operation;
A plurality of elastic members that are fixed to the support member and arranged in parallel in the longitudinal direction of the rotating body, and directly or indirectly contact the stopper contact portion of the rotating body that rotates in the forward direction. A stopper portion that cooperates and regulates the forward rotation end position of the rotating body in a contact state;
The rotating body has a metal main portion that is rotatable around the rotation fulcrum portion, and the stopper contact portion is made of an elastic resin, and at the free end of the main portion. A keyboard device characterized in that it protrudes toward the stopper portion and has a width larger than that of the main portion in the stopper contact portion in the direction in which the rotating bodies are arranged.   There are a plurality of ribs provided on the support member corresponding to positions between adjacent rotating bodies in the direction of arrangement of the rotating bodies, and the vicinity of the free ends of the rotating bodies or the stopper contact portions are adjacent to each other. The keyboard device according to claim 1, wherein the keyboard device is configured to slide between the ribs. A support member having a pivot point;
A plurality of rotating bodies that are supported in parallel by the support member so as to be rotatable about the rotation fulcrum, have stopper contact portions, and each rotate by a key pressing operation;
A plurality of elastic members that are fixed to the support member and arranged in parallel in the longitudinal direction of the rotating body, and directly or indirectly contact the stopper contact portion of the rotating body that rotates in the forward direction. A stopper portion that cooperates and regulates the forward rotation end position of the rotating body in a contact state;
The plurality of stopper portions are configured by making their longitudinal elastic modulus different from each other,
The rotating body includes a weight portion that is rotatable around the rotation fulcrum portion,
The stopper contact portion is made of an elastic resin,
The keyboard device, wherein a width of the stopper contact portion in the direction in which the rotating bodies are arranged is larger than the weight portion.   4. The keyboard apparatus according to claim 3, wherein the longitudinal elastic modulus of the plurality of stopper portions is different for each key range or each key. A support member having a pivot point;
A plurality of rotating bodies that are supported in parallel by the support member so as to be rotatable about the rotation fulcrum, have stopper contact portions, and each rotate by a key pressing operation;
A plurality of elastic members that are fixed to the support member and arranged in parallel in the longitudinal direction of the rotating body, and directly or indirectly contact the stopper contact portion of the rotating body that rotates in the forward direction. A stopper portion that cooperates and regulates the forward rotation end position of the rotating body in a contact state;
The plurality of stopper portions are configured such that their longitudinal elastic coefficients are different from each other, and the longitudinal elastic modulus of the stopper portion disposed on the farthest side from the rotation fulcrum portion is disposed on the farthest side. A keyboard device characterized by being lower than a longitudinal elastic modulus of a stopper portion disposed closer to the rotation fulcrum portion than the stopper portion. A support member;
A plurality of keys provided in parallel with the support member, each of which includes a drive unit and is rotatable by a key pressing operation;
The corresponding key is provided corresponding to the key, has a driven portion and a stopper abutting portion, and is supported in parallel by the support member so as to be rotatable around a rotation fulcrum portion. A plurality of hammer bodies each rotating around the rotation fulcrum by driving the driven part by:
A plurality of elastic members fixedly fixed to the support member, arranged in parallel in the longitudinal direction of the hammer body, and directly or indirectly contacted with the stopper contact portion of the hammer body rotating in the forward direction. A stopper portion that cooperates and regulates the forward rotation end position of the hammer body in a contact state;
The plurality of stopper portions are configured such that their longitudinal elastic coefficients are different from each other, and the longitudinal elastic modulus of the stopper portion disposed on the farthest side from the rotation fulcrum portion is disposed on the farthest side. A keyboard device characterized by being lower than a longitudinal elastic modulus of a stopper portion disposed closer to the rotation fulcrum portion than the stopper portion.

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