JP5771924B2 - Electronic keyboard instrument switch body - Google Patents

Description

  The present invention relates to a switch body of an electronic keyboard instrument that detects a key operation.

  2. Description of the Related Art Conventionally, an electronic keyboard instrument is known in which a switch body that is driven by a displacement member such as a key itself or a hammer by a key pressing operation is provided (Patent Document 1 below). This type of switch body is made of a soft resin or the like, and has a movable contact portion protruding from the base portion to an elastic bulge portion that bulges from a base portion into a dome shape. By abutting, it becomes conductive (on), and a key pressing operation is detected.

  Further, as shown in Patent Document 2 below, in a case where three or more movable contact portions are provided in one switch body, there is a case where the turn-on order is determined in the key pressing forward stroke. When each movable contact portion is turned on, the presence / absence of key depression, the key depression speed, and the like are detected.

  This kind of dome-shaped switch body is driven by its elasticity and deforms, and when it is in a non-key-pressed state, it returns to its original shape. At that time, since the movable contact portion is also elastically integrated with the elastic bulge portion via the skirt portion, the movable contact portion is elastically deformed when coming into contact with the fixed contact portion, and returns to its original shape when the key is not pressed.

Japanese Patent No. 3381604 Japanese Patent Publication No. 61-54234

  However, in the case where three or more movable contact portions are arranged in a line in the front-rear direction, as in the switch body of Patent Document 2, the entire switch body is vertically long and unstable with respect to the force from the lateral direction. It is easy to become. For example, when a key like a glissando is played in a slanting horizontal direction, the movable contact portion tends to tilt.

  Since the entire switch body is vertically long and is turned on in order from the player's movable contact part during the key-pressing stroke, the switch body deforms if a lateral force is applied to the switch body during driving. Cheap. For this reason, it may occur that the movable contact portion that is turned on last in the key pressing forward stroke is not directly opposed to the fixed contact portion when the movable contact portion is actually turned on. Then, it does not contact the fixed contact portion properly, and the switch operation becomes unstable. For example, in a contact time difference type touch response switch, there may be a disadvantage that the value of velocity data varies from time to time even with the same key depression strength.

  On the other hand, since the first movable contact portion that is turned on is located closest to the player, the load balance is temporarily biased toward the player, and the switch operation becomes unstable especially when the key is strongly pressed. In addition, the movable contact portion that is turned on first has a long stroke, so that the movable contact portion itself tends to tilt and the switch operation becomes unstable.

  If the switch operation becomes unstable in this way, chattering is likely to occur, and accurate detection of key operations may be difficult.

  The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a switch body of an electronic keyboard instrument that can stabilize the switch operation and increase the detection accuracy of the key operation. There is.

In order to achieve the above object, the switch body of the electronic keyboard instrument according to claim 1 of the present invention is driven by the key itself which is displaced by the key pressing operation or a displacement member which is a member interlocking with the key, and operates the corresponding key. A switch body of an electronic keyboard instrument to be detected, and a base portion to be attached to a substrate, and an elastic bulge portion that bulges up uniformly from the base portion over the entire periphery and is driven by the displacement member A plurality of elastic bulges that are elastically provided on the elastic bulges so as to be opposed to the fixed contact parts disposed on the substrate, and are in an on state by abutting the corresponding fixed contact parts. The plurality of movable contact portions have different projecting heights with respect to the fixed contact portion, and the shape of the facing surface facing the fixed contact portion is circular. The plurality of movable contact portions are determined to be turned on so that they are turned on in descending order of the protruding height in the key pressing forward stroke, and the movable contact portion that is turned on last in the key pressing forward stroke is It is arranged at a position between at least two of the movable contact portions that are turned on earlier.

To achieve the above object, the switch body of the electronic keyboard instrument according to claim 2 of the present invention is provided corresponding to the key and is driven by a displacement member which is a key itself which is displaced by a key pressing operation or a member interlocked with the key. A switch body of an electronic keyboard instrument for detecting the operation of a corresponding key, a base portion for mounting on a substrate, and a bulge so as to rise evenly from the base portion over the entire periphery , and the displacement member At least three elastic bulges are elastically provided on the elastic bulges so as to face the elastic bulges driven by and fixed contact parts disposed on the substrate, and contact the corresponding fixed contact parts. And a plurality of movable contact portions that are turned on, and the plurality of movable contact portions have different protrusion heights with respect to the fixed contact portion and face the fixed contact portion. The shape of the facing surface is circular, and the plurality of movable contact portions are turned on so that they turn on in the descending order of the protruding height in the key pressing forward stroke, and are turned on first in the key pressing forward stroke. The movable contact portion is arranged at a position between at least two of the movable contact portions that are turned on after that.

In order to achieve the above object, the switch body of the electronic keyboard instrument according to claim 3 of the present invention is provided corresponding to the key and is driven by a displacement member which is a key itself which is displaced by a key pressing operation or a member interlocking with the key. A switch body of an electronic keyboard instrument for detecting the operation of a corresponding key, a base portion for mounting on a substrate, and a bulge so as to rise evenly from the base portion over the entire periphery , and the displacement member At least three elastic bulges are elastically provided on the elastic bulges so as to face the elastic bulges driven by and fixed contact parts disposed on the substrate, and contact the corresponding fixed contact parts. And a plurality of movable contact portions that are turned on, and the plurality of movable contact portions have different protrusion heights with respect to the fixed contact portion and face the fixed contact portion. The shape of the facing surface is circular, and the plurality of movable contact portions are turned on so that they turn on in the descending order of the protruding height in the key pressing forward stroke, and are turned on first in the key pressing forward stroke. The movable contact portion is characterized in that the area of the facing surface facing the corresponding fixed contact portion is larger than any of the movable contact portions that are turned on thereafter.

Preferably, the movable contact portion that is turned on first in the key pressing forward stroke has a larger area of the facing surface that faces the corresponding fixed contact portion than any of the movable contact portions that are turned on thereafter. ). Preferably, the area of the facing surface that faces the corresponding fixed contact portion is smaller as the movable contact portion is turned on later in the key pressing forward stroke.

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

  According to the first, second, and third aspects of the present invention, it is possible to stabilize the switch operation and increase the detection accuracy of the key operation.

  According to the fourth aspect, since the movable contact portion that is turned on first with a large stroke stably contacts the fixed contact portion without being inclined, the operation is stabilized.

  According to the fifth aspect, the switch body can be further downsized.

It is a typical side view paying attention to one key of the electronic keyboard musical instrument to which the switch body concerning a 1st embodiment of the present invention is applied. It is the longitudinal cross-sectional view of the switch body which concerns on 1st, 2nd embodiment, and a back view. It is a figure which shows typically arrangement | positioning of the movable contact part in one switch body in a modification, and the order of ON.

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

(First embodiment)
Fig.1 (a) is a typical side view which paid its attention to one key of the electronic keyboard musical instrument to which the switch body concerning the 1st Embodiment of this invention is applied.

  The electronic keyboard instrument is provided with a substrate 12, a key 10, a control unit 19, a musical tone generation unit 9, and a switch body SW. Although not shown in its entirety, the key 10 includes a white key 10W and a black key 10B, and a plurality of keys 10 are arranged in parallel in the left-right direction as viewed from the player. All of the keys 10 are configured in the same manner, and the front end (the left end of FIG. 1A) swings in the vertical direction (clockwise and counterclockwise in FIG. 1A) around the rear key fulcrum 11. (Rotation) is made free. The front end of the key 10 is always urged upward, and in a non-key-pressed state, the key 10 is engaged with a stopper (not shown) and is regulated to the initial position shown in FIG. When the front end of the key 10 is pressed at the initial position, the front end is displaced downward.

  The switch body SW is arranged on the substrate 12 corresponding to each key 10 and is driven by the corresponding key 10 to supply a detection signal to the control unit 19. One controller 19 and one musical tone generator 9 are provided for each keyboard instrument. The control unit 19 includes a CPU, a ROM, a RAM, a timer, a storage device, various interfaces, and the like (not shown), and the CPU controls the operation of the entire instrument according to a program stored in the ROM. Although not shown individually, the musical sound generator 9 includes a sound source circuit, an effect circuit, a sound system, and the like, and generates sound according to control by the controller 19. In the present embodiment, a musical tone corresponding to the key 10 that has been pressed and detected by the switch body SW is generated.

  In the present embodiment, a configuration in which the switch body SW is driven by the key 10 is illustrated, but the present invention is not limited to this. The switch body SW may be driven by a displacement member that is displaced by a key pressing operation, and the displacement member may be the key 10 itself or a member that is interlocked with the key 10. For example, as shown in FIG. 1 (b), the displacement member may be a hammer 15. There may be an interposition member between the key 10 and the displacement member.

  That is, in the example shown in FIG. 1B, the hammer 15 is disposed below the key 10 in correspondence. The hammers 15 are arranged by the number of keys in parallel in the arrangement direction of the keys 10. Each hammer 15 is rotatable about the hammer fulcrum 14 in the clockwise and counterclockwise directions of FIG. The front and rear positions of the key fulcrum 11 and the hammer fulcrum 14 are common.

  A front end portion of the hammer 15 and a front end portion of the key 10 are rotatably connected by a rotation shaft 13. Accordingly, the corresponding hammer 15 is rotated in conjunction with the rotation of the key 10 by the key release operation. Mass is concentrated at the rear end of the hammer 15. In the free state, the hammer 15 is arranged to urge the key 10 in the clockwise direction in FIG. Due to the mass of the hammer 15, an inertial force is applied to the key pressing operation, and a key pressing feeling like a live piano is obtained. The switch body SW is driven by the drive unit 16 of the hammer 15.

  Next, the configuration of the switch body SW will be described. Since each switch body SW is comprised similarly, the structure of one switch body SW is demonstrated as a representative. 2A and 2B are a longitudinal sectional view and a rear view of the switch body SW. 2A and 2B, the upper side of the figure is the rear side, that is, the side where the key fulcrum 11 is located, and the lower side of the figure is the player side (front side). Hereinafter, the longitudinal direction of the key 10 is also referred to as the front-rear direction, and the side where the key fulcrum 11 is located as viewed from the player is referred to as the rear.

  The switch body SW employs a three-make type or more configuration in which there are three or more combinations of the movable contact portion and the fixed contact portion. In the example of FIG. That is, the switch body SW is a contact time difference type three-make touch response switch integrally formed of an elastic member such as rubber.

  As shown in FIGS. 2A and 2B, the switch body SW has a base portion 21, and the base portion 21 is attached to the substrate 12 by fixing or the like. In the switch body SW, an elastic bulging portion 22 bulging upward in a dome shape is formed from the base portion 21. The elastic bulging portion 22 has a skirt portion 26 that extends from the base portion 21 and is easily elastically deformed. The key 10 is in contact with the upper surface of the elastic bulging portion 22, and when the key is pressed, the elastic bulging portion 22 is driven downward.

  Three movable contact portions 25 (25A, 25B, 25C) that bulge downward from the elastic bulge portion 22 (on the side of the substrate 12) in a dome shape are provided inside the elastic bulge portion 22. The movable contact portion 25 is elastically connected to the elastic bulging portion 22 via a skirt portion 24 (24A, 24B, 24C) that is easily elastically deformed, and can be individually deformed. At the bottom of each movable contact portion 25, movable contacts parallel to the substrate 12 are provided, and these movable contacts are made of a conductive material such as carbon ink.

  A fixed contact portion 17 (17A, 17B, 17C) composed of a pair of comb-like electrodes (not shown in detail) is laid on the upper surface of the substrate 12, and movable contact portions 25A, 25B, 25C and The fixed contact portions 17A, 17B, and 17C face each other.

  In the non-key-pressed state, the protruding height of the movable contact portion 25 toward the substrate 12 is the movable contact portions 25A, 25C, and 25B in descending order. That is, the movable contact portion 25A is closest to the substrate 12. The surface of the movable contact portion 25 that faces the fixed contact portion 17 is circular.

  Each movable contact portion 25 is brought into an on state by contacting the corresponding fixed contact portion 17. Here, the order in which the movable contact portion 25 is turned on in the key pressing forward stroke is determined by the above-described setting of the protruding height, and the movable contact portions 25A, 25C, and 25B are formed in order from the one that turns on earlier. Yes. On the other hand, in the key release process, the movable contact portions 25B, 25C, and 25A are arranged in order from the one that turns off earlier.

  The mode of musical tone control by the on / off detection signal of each movable contact portion 25 is not limited. As an example, in the key pressing forward process, the key pressing velocity is set by the time from turning on the movable contact portion 25A to turning on the movable contact portion 25C, and turning on the movable contact portion 25B is set as a sounding trigger. In the key release process, the key release velocity is set by the time from the turn-off of the movable contact portion 25B to the turn-off of the movable contact portion 25C, and the turn-off of the movable contact portion 25A is set as a mute trigger.

  Here, when viewing the positional relationship in the front-rear direction, the movable contact portion 25B is disposed at a position between the movable contact portion 25A and the movable contact portion 25C that are turned on before that. Assuming that the conventional configuration is such that the player side turns on sequentially from the movable contact portion on the player's side in the key-pressing stroke, the entire switch body SW is vertically long, so it is driven by playing the key diagonally laterally, etc. The switch body SW is easily deformed by applying a lateral force to the switch body SW. As a result, when the movable contact portion that is turned on last is actually turned on, the movable contact portion may not face the fixed contact portion and may not contact the fixed contact portion appropriately.

  However, in the present embodiment, since the movable contact portion 25B that is turned on last in the key pressing forward stroke is located in the middle, the front and rear movable contact portions 25A and 25C are turned on and the movable contact portion 25B is movable when the state is stabilized. The contact portion 25B is turned on. Therefore, the behavior of the movable contact portion 25B is stabilized and appropriately contacts the fixed contact portion 17B.

  By the way, the area of the movable contact portion 25A that is turned on first in the key pressing forward stroke (the area of the surface facing the fixed contact portion 17A) is set larger than the areas of the movable contact portions 25B and 25C. Accordingly, also for the skirt portion 24, the skirt portion 24A is designed to be larger than the skirt portions 24B and 24C. Since the movable contact portion 25A that is turned on first has a long stroke, the movable contact portion 25A tends to be inclined in the middle of deformation as compared with a movable contact portion having the same area and a short stroke, and the switch operation tends to be unstable. However, since the movable contact portion 25A has a large area, the operation is stabilized.

  According to the present embodiment, since the movable contact portion 25B is disposed between the movable contact portions 25A and 25C, it is possible to stabilize the switch operation and increase the detection accuracy of the key operation.

  In addition, since the area of the movable contact portion 25A that is turned on first in the key pressing forward stroke is larger than that of the movable contact portions 25B and 25C that are turned on later, the switch operation is stabilized from this point as well. The detection accuracy of the key operation can be increased. Moreover, since the size of the skirt portions 24B and 24C can be designed smaller than that of the skirt portion 24A for the movable contact portions 25B and 25C to be turned on later, the size of the entire switch body SW is reduced without being unnecessarily large. Contributes to

(Second Embodiment)
2C and 2D are a longitudinal sectional view and a rear view of the switch body according to the second embodiment of the present invention, and correspond to FIGS. 2A and 2B.

  In the first embodiment, the movable contact portions 25 of the switch body SW are movable contact portions 25A, 25C, and 25B in the order of turning on earlier in the key-pressing forward stroke. On the other hand, in the second embodiment, as shown in FIG. 2C, the movable contact portions 25B, 25A, and 25C are formed in order from the one that turns on earlier. The arrangement order in the front-rear direction is the same as in the first embodiment. Other configurations are the same as those of the first embodiment.

  Accordingly, in view of the positional relationship in the front-rear direction, the movable contact portion 25B that is turned on first is disposed at a position between the movable contact portion 25A and the movable contact portion 25C that are turned on later. As for the area of the movable contact portion 25, the area of the movable contact portion 25B that is turned on first is larger than the movable contact portions 25A and 25C that are turned on later. Accordingly, the skirt portion 24B is designed to be larger than the skirt portions 24A and 24C.

  According to the present embodiment, since the movable contact portion 25B that is turned on first is located in the middle, it is avoided that the load balance is temporarily biased to the player side or the rear side in the key pressing forward stroke. That is, due to the contact between the movable contact portion 25B and the fixed contact portion 17B, the state is temporarily fixed in the middle of the key depression, and the subsequent switching operation between the movable contact portion 25 and the fixed contact portion 17 is performed accurately. Become so. Thereby, the switch operation is stable even when the key is strongly pressed. In addition, the area of the movable contact portion 25B that is turned on first in the key pressing forward stroke is larger than the movable contact portions 25A and 25C that are turned on later. Therefore, it is possible to achieve the same effects as those of the first embodiment with respect to stabilizing the switch operation, increasing the accuracy of detecting the key operation, and reducing the size of the entire switch body SW.

  By the way, in the said 1st, 2nd embodiment, the movable contact part 25 illustrated three structures. However, the number of movable contact portions 25 may be four or more. In that case, from the viewpoint of stabilizing the switch operation, the movable contact portion that is turned on last in the key-pressing forward stroke is between the at least two movable contact portions of the movable contact portions that are turned on before that. What is necessary is just to arrange | position to a position. Alternatively, the movable contact portion that is turned on first in the key pressing forward stroke may be disposed at a position between at least two movable contact portions of the movable contact portions that are turned on later. That is, the movable contact portion that is turned on first or last may be disposed so as not to correspond to either the front end or the last movable contact portion.

  The “position between” here is a position in the positional relationship in the longitudinal direction of the shape of the switch body SW. Therefore, the movable contact portions do not necessarily have to be aligned. For example, the positions of the movable contact portions in the key arrangement direction may be slightly shifted along the front-rear direction, or may be staggered.

  FIGS. 3A to 3E are diagrams schematically illustrating the arrangement of the movable contact portion 25 and the turn-on order in one switch body SW. The movable contact portion 25 is arranged on a straight line in the front-rear direction. In these drawings, the number indicates the turn-on order in the keystroke process, and the size indicates the area of the surface of the movable contact portion 25 facing the corresponding fixed contact portion 17.

  For example, in the example shown in FIG. 3A, the fourth movable contact portion 25 that is turned on last is positioned between the second and third movable contact portions 25 that are turned on. It can also be said that the fourth movable contact portion 25 that is turned on is located between the first and second movable contact portions 25 that are turned on. In the example shown in FIG. 3B, the last movable contact portion 25 that is turned on is located between the first (or third) and fourth (or second) movable contact portion 25. To do.

  In the example shown in FIG. 3C, the first movable contact portion 25 that is turned on first is located between the third and fourth (or second) movable contact portion 25 that is turned on. In the example shown in FIG. 3D, the movable contact portion 25 that is turned on first is located between the movable contact portion 25 that is turned on second (or fourth) and third (or fifth).

  In the example shown in FIG. 3E, the movable contact portion 25 that is turned on first is located between the second (or fourth) movable contact portion 25 that is turned on third.

  By the way, in each said embodiment, the area of the surface which opposes the fixed contact part 17 of the movable contact part 25 is what is turned on first is larger than others. This is also the case in the examples of FIGS. However, as shown in FIG. 3 (e), the movable contact portion 25 that is turned on later in the key pressing forward stroke may be designed such that the area of the surface facing the corresponding fixed contact portion 17 is reduced. In particular, in the example shown in FIGS. 3B to 3E, the movable contact portion 25 and the fixed contact portion 17 are in contact with the movable contact portion 25 and the fixed contact portion 17 in the middle instead of the end in the front-rear direction. Therefore, the subsequent switching operation between the movable contact portion 25 and the fixed contact portion 17 is performed accurately. Therefore, stable operation is ensured even if the area of the movable contact portion 25 to be turned on later is small. Further, since the stroke of the movable contact portion 25 to be turned on later is shorter, the size of the skirt portion 24 can be designed to be as small as possible. By doing so, the switch body can be further miniaturized, and a sudden increase in the reaction force in the latter half of the key pressing forward stroke can be suppressed, leading to an improvement in the key pressing feeling.

  10 key (displacement member), 12 substrate, 15 hammer (displacement member), 17 fixed contact portion, 21 base portion, 22 elastic bulge portion, 25 movable contact portion, SW switch body

Claims (5)

A switch body of an electronic keyboard instrument which is provided corresponding to a key and is driven by a displacement member which is a key itself or a member interlocking with the key which is displaced by a key pressing operation, and detects the operation of the corresponding key,
A base for mounting on a substrate;
An bulging portion that bulges up uniformly from the base portion over the entire periphery, and is driven by the displacement member; and
A plurality of movable contacts that are elastically provided in the elastic bulge portion so as to face the fixed contact portion disposed on the substrate and are turned on by contacting the corresponding fixed contact portion. And
The plurality of movable contact portions have different projecting heights with respect to the fixed contact portion, and the shape of the facing surface facing the fixed contact portion is circular,
The plurality of movable contact portions are turned on so that they are turned on in the descending order of the protruding height in the key pressing forward stroke, and the movable contact portion that is turned on last in the key pressing forward stroke is A switch body for an electronic keyboard instrument, wherein the switch body is disposed at a position between at least two of the movable contact portions to be turned on before. A switch body of an electronic keyboard instrument which is provided corresponding to a key and is driven by a displacement member which is a key itself or a member interlocking with the key which is displaced by a key pressing operation, and detects the operation of the corresponding key,
A base for mounting on a substrate;
An bulging portion that bulges up uniformly from the base portion over the entire periphery, and is driven by the displacement member; and
A plurality of movable contacts that are elastically provided in the elastic bulge portion so as to face the fixed contact portion disposed on the substrate and are turned on by contacting the corresponding fixed contact portion. And
The plurality of movable contact portions have different projecting heights with respect to the fixed contact portion, and the shape of the facing surface facing the fixed contact portion is circular,
The plurality of movable contact portions are determined to be turned on so that they are turned on in the order of the protruding height in the keying forward stroke, and the movable contact portion that is first turned on in the key pressing forward stroke is A switch body for an electronic keyboard instrument, wherein the switch body is disposed at a position between at least two of the movable contact portions to be turned on later. A switch body of an electronic keyboard instrument which is provided corresponding to a key and is driven by a displacement member which is a key itself or a member interlocking with the key which is displaced by a key pressing operation, and detects the operation of the corresponding key,
A base for mounting on a substrate;
An bulging portion that bulges up uniformly from the base portion over the entire periphery, and is driven by the displacement member; and
A plurality of movable contacts that are elastically provided in the elastic bulge portion so as to face the fixed contact portion disposed on the substrate and are turned on by contacting the corresponding fixed contact portion. And
The plurality of movable contact portions have different projecting heights with respect to the fixed contact portion, and the shape of the facing surface facing the fixed contact portion is circular,
The plurality of movable contact portions are determined to be turned on so that they are turned on in the order of the protruding height in the keying forward stroke, and the movable contact portion that is first turned on in the key pressing forward stroke is A switch body for an electronic keyboard instrument, characterized in that the area of the facing surface facing the corresponding fixed contact portion is larger than any of the movable contact portions that are turned on later.   The movable contact portion that is first turned on in the key pressing forward stroke has a larger area of the facing surface that faces the corresponding fixed contact portion than any of the movable contact portions that are turned on thereafter. A switch body of the electronic keyboard instrument according to 1 or 2.   The switch body of an electronic keyboard instrument according to claim 3 or 4, wherein the area of the facing surface facing the corresponding fixed contact portion is smaller as the movable contact portion is turned on later in the key pressing forward stroke.

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