JP3901027B2 - Electronic device board holding structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic device such as an electronic musical instrument having an operator, a keyboard, and the like, and relates to a substrate holding structure such as a circuit board disposed in the electronic device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an electronic keyboard instrument, a switch board (circuit board) is disposed under the key in order to detect a key depression or the like on the keyboard. FIG. 8 is a diagram showing an example of a switch board mounting structure in a conventional electronic keyboard instrument. The lower case 11 is formed with bosses 11a and 11b on the front side (performer side) and the back side (opposite side of the performer), and the switch board 12 is disposed on the bosses 11a and 11b. The black key 13 and the white key 14 are formed as separate members. The base end portions 13 a and 14 a are overlapped at the position of the boss 11 b on the back side to form a common base end portion, and are arranged on the switch substrate 12. The switch board 12 and the base end portions 14a and 13a are fixed to the back side boss 11b with screws A, and the upper case 15 is disposed on the base end portions 13a and 14a. Further, the front side end portion of the switch substrate 12 is fixed to the boss 11a with a screw B.
[0003]
The black key 13 and the white key 14 are formed with thin plate-like hinge portions 13b and 14b having elasticity extending from the base end portions 13a and 14a. The black key 13 and the white key 14 have the base end portions 13a and 14a substantially omitted. It can swing as a fulcrum. On the switch board 12, a key switch 16 for detecting the depression of the black key 13 and the white key 14 is attached. In FIG. 8, only the key switch 16 for the black key 13 appears. Further, a key stopper 12 a is attached to the front end of the switch board 12. The tip 14c of the white key 14 is inserted between the lower case 11 and the upper case 15 at the front end of the case. The upper case 15 has a key stopper 17 and the lower case 11 has a key stopper 18. It is attached.
[0004]
With the above configuration, when the black key 13 is depressed, the lower end surface 13c of the black key 13 comes into contact with the key stopper 12a and the lower end position is restricted. Further, the tip end portion 14c for pressing the white key 14 comes into contact with the key stopper 18 of the lower case 11, and the lower end position is regulated. The key switch 16 detects a key depression or the like by contact between a movable contact formed in a rubber dome-shaped movable portion 16a and a fixed contact formed on the switch substrate 12, for example.
[0005]
[Problems to be solved by the invention]
In the above-described conventional structure, when an electronic musical instrument is dropped on the floor or a child rides on the keyboard, a force more than the normal assumed force at the time of performance is applied to the switch board 12 and the key switch 16, The switch board 12, the key switch 16, or the key itself may be destroyed. In order to prevent this, it is conceivable to increase the thickness of the key stoppers 12a, 18; however, since the key stoppers 12a, 18 are formed of felt or the like, they are particularly crushed by a force exceeding the normal assumed force. Therefore, there is a problem that the touch (operation feeling) of the keyboard is deteriorated. In addition, the thick key stopper causes a problem that even a normal performance cannot withstand aging. Furthermore, since the bosses 11a and 11b are fixed in the front-rear direction, when the switch board 12 is attached, for example, four screws are usually required for one board. It is troublesome.
[0006]
Further, for example, as shown by a one-dot chain line in FIG. 8, it is conceivable to eliminate the boss 11 a and provide a limiter 11 a ′ such as a protrusion with a space D at the lower part of the front end portion of the switch substrate 12. As a result, even when a force greater than the normal assumed force is applied to the switch board 12, the switch board 12 is bent downward and stops when the switch board 12 (the end thereof) contacts the limiter 11a '. To do. That is, since the stress is absorbed to some extent by the flexibility of the switch substrate 12, it is possible to prevent the switch substrate 12 from being broken. However, considering the prevention of breakage due to bending of the switch board 12, the distance D between the limiter 11a 'and the switch board 12 cannot be so large. For example, when the fortissimo is strongly pressed, the switch board 12 comes into contact with the limiter 11a'. Mechanical noise may occur. Furthermore, since the switch board 12 is fixed at one location of the boss 11b and the switch board 12 is a single point fulcrum (viewed on the cross section), there is a problem that the fatigue of the switch board 12 becomes severe at this fulcrum portion.
[0007]
The above description relates to the interference between the key and the switch board in the electronic keyboard instrument. However, such a problem is particularly caused by a manually operated operator and a substrate displaced by the operation of the operator, or This also occurs in an electronic device provided with a switch, a sensor or the like that is driven by operation of the operator.
[0008]
The present invention has been made in view of the above-mentioned problems. The substrate is made durable by preventing the substrate from being broken or broken by driving the operation element, and mechanical noise is not generated during operation of the operation element. It is another object of the present invention to provide a substrate holding structure for an electronic device that can protect a switch, a sensor, or an operation element, and can easily attach and remove the substrate.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a substrate holding structure for an electronic device, comprising: a frame; a substrate partially fixed to the frame; a stopper portion that is spaced from the portion of the substrate; and the stopper portion. A substrate holding structure for an electronic device having an operation member for which operation is restricted, The substrate is configured to be displaced by a pressing force from the operating member, A displacement restriction limiter for restricting the substrate from being able to be displaced by a pressing force received by the stopper when the movement of the operation member by the stopper is restricted to a predetermined amount or less; It is characterized by comprising a curved surface that increases in distance from the substrate as it moves away from the part of the substrate toward the stopper when loaded.
[0010]
According to the substrate holding structure of the electronic device according to claim 1, when the operation of the operation member (operator or the like) is restricted by the stopper portion of the substrate (a stopper of a member different from the substrate or a part of the substrate), the stopper portion The substrate is displaced by the pressing force received from the operating member, but the amount of displacement is restricted to a predetermined amount or less by the displacement restriction limiter. The displacement regulation limiter is formed of a curved surface whose distance from the substrate increases as it moves away from the portion (fixed portion to the frame) of the substrate toward the stopper when no load is applied to the substrate. When displaced, the substrate contacts the curved surface and is displaced following the curved surface.
[0011]
Therefore, as the displacement of the substrate progresses, the portion of the substrate that has already contacted the displacement limiter is not displaced any more, and the non-contact portion is locally displaced (deformed) by the displacement of the contact portion. It can be suppressed. That is, as a result, the action of deforming the substrate due to the applied stress is distributed to each local portion of the substrate, so that the entire substrate can be prevented from being broken or broken.
[0012]
Further, since each part of the substrate simply contacts the displacement regulation limiter successively following the part that is already in contact with the displacement regulation limiter, no mechanical noise is generated.
[0013]
Further, since the substrate is displaced (bends) with respect to the applied stress, the stress directly applied to the switch or sensor can be reduced, and the switch or sensor can be protected.
[0014]
Further, since the substrate can be fixed only by at least one fixing portion at the front and rear positions, attachment and removal are easy.
[0015]
The board may be various boards such as a switch board provided with a switch corresponding to the operation element, a key switch board provided with a key switch, and a timbre switch board provided with a timbre selection switch.
[0016]
For example, as in a first embodiment to be described later, the operating member is a key of a keyboard, and the substrate is displaced by receiving a pressing force by a key as the operating member, and a key stopper such as a felt ( For example, a keyboard stopper destruction prevention board (for example, switch board 12) for preventing deterioration of the key stopper 12a) may be used.
[0017]
For example, as in a fourth embodiment to be described later, the operation member is a mass body (a key hammer for imitating a key touch by an action assembly in an acoustic piano) that is interlocked with a key depression on a keyboard, and the substrate has the operation Mass body stopper destruction prevention substrate (protective substrate 5) that receives a pressing force from the mass body as a member to restrict the operation of the mass body to some extent and prevents deterioration of a mass body stopper such as felt (for example, stopper member 105). ).
[0018]
For example, as in a fourth embodiment to be described later, the operation member is a mass body (key hammer) that interlocks with key depression on a keyboard, and includes an after sensor (for example, a sensor device 70) that is driven by the mass body. Further, it may be a substrate for preventing destruction of the after sensor (for example, the protective substrate 5) that receives a pressing force from the mass body as the operation member and restricts the operation of the mass body to some extent and prevents the destruction of the after sensor.
[0019]
For example, as in a second embodiment to be described later, in the displacement restriction limiter, the position at which separation starts from the substrate (for example, the boundary position between the flat portion 3a-1 and the curved surface portion 3a-2 on the end surface 3a of the rib wall 3) is It may be a position on the stopper portion side away from the fixing portion for fixing the substrate.
[0020]
For example, as in the fourth embodiment described later, the stopper portion may be a part of the substrate (for example, the end portion 5a of the protective substrate 5), or provided on the substrate as in the first embodiment described later, for example. It may be an operating member displacement stopper (for example, key stopper 12a) that is a separate member from the substrate.
[0021]
For example, as in a first embodiment described later, the operating member may be a key, and the operating member displacement stopper may be a key stopper (for example, key stopper 12a).
[0022]
For example, as in a later-described fourth embodiment, the operating member may be the mass body (for example, the mass body 50), and the operating member displacement stopper may be the mass body stopper (for example, the stopper member 105).
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view of a keyboard device to which the substrate holding structure of the first embodiment is applied. The same elements as those in FIG. 8 are denoted by the same reference numerals as those in FIG. The lower case 11 as a frame is made of synthetic resin, and a fin 1 extending in the direction in which the keys 13 and 14 are arranged is erected on the inner side of the bottom surface of the lower case 11, and further, between the fin 1 and the boss 11b. A rib wall 2 is erected on the wall. The fin 1 and the rib wall 2 are formed integrally with the boss 11b and the like when the lower case 11 is molded. The fin 1 is formed in a long shape in the key arrangement direction corresponding to the bottom of the entire key, but the rib wall 2 is a plate having a predetermined thickness, and every 3 to 4 keys, every half octave, or 1 A plurality of keys are formed apart from each other in the key arrangement direction, such as for each octave.
[0024]
The height of the fin 1 is lower than the height of the boss 11b. The end surface 2a of the rib wall 2 facing the switch board 12 is flush with the end surface 11a-1 of the boss 11b on the side of the boss 11b. It is a slightly convex curved surface that continues from the boss 11b to the end face 1a of the fin 1. Further, the end surface 1a of the fin 1 is an inclined surface with the front side of the instrument (the player side, the same applies hereinafter) lowered so as to be smoothly connected to the end surface 2a of the rib wall 2. Thus, a gap is formed between the switch substrate 12 and the rib wall 2 and the fin 1 so that the gap increases as the distance from the boss 11b increases. The fin 1 is located below the key stopper 12 a provided at the end of the switch substrate 12.
[0025]
The above configuration is a specific example of claim 1. The lower frame 11 is a “frame”, the switch board 12 is a “board”, the key stopper 12 a is a “stopper portion”, and the black key 13 is an “operation member”. The rib wall 2 constitutes a “displacement restriction limiter”, and the end surface 2a of the rib wall 2 constitutes a “curved surface of the displacement restriction limiter”.
[0026]
That is, the lower case 11 (frame), the switch substrate 12 (substrate) in which a part (fixed portion to the boss 11b) is fixed to the lower case 11, and the switch substrate 12 are located away from the part. The electronic device has a substrate holding structure having a key stopper 12a (stopper portion) and a black key 13 (operation member) whose operation is restricted by the key stopper 12a. In addition, a rib wall 2 (displacement restriction limiter) that restricts the switch board 12 from being displaced by a pressing force received by the key stopper 12a when the operation of the black key 13 by the key stopper 12a is restricted to a predetermined amount or less is provided. The rib wall 2 is an end face in which the distance from the switch board 12 increases as it moves away from the part (fixed part with the boss 11b) of the switch board 12 toward the key stopper 12a when no load is applied to the switch board 12. 2a (curved surface).
[0027]
With the above configuration, when the key pressing operation of the black key 13 is restricted by the key stopper 12a of the switch board 12, the switch board 12 is displaced by the pressing force received by the key stopper 12a from the black key 13. The amount is regulated to a predetermined amount or less by the rib wall 2. When the switch board 12 is displaced, the switch board 12 comes into contact with the end face 2a and is displaced along the end face 2a. Therefore, in the process of the displacement of the switch board 12, the part of the switch board 12 that has already contacted the rib wall 2 (end surface 2a) is not displaced any more, and the non-contact part (the part before the contact part) ) Is suppressed by the amount of displacement of the contact portion. That is, since the action of deforming the switch board 12 is distributed to each local part of the switch board 12, the entire switch board 12 can be prevented from being broken or broken.
[0028]
In addition, since each part of the switch substrate 12 is only in contact with the rib wall 2 successively after the part already in contact with the rib wall 2, no mechanical noise is generated. Further, since the switch substrate 12 is displaced (flexed) with respect to the applied stress, the stress directly applied to the key switch 16 can be reduced, and the key switch 16 can be protected. Further, since the switch board 12 is fixed only at one boss 11b at the front and rear positions, it is easy to attach and remove.
[0029]
(Second Embodiment)
FIG. 2 is a cross-sectional view of an electronic musical instrument to which the substrate holding structure of the second embodiment is applied. In this electronic musical instrument, a main body case is formed by the half front case 21 and the back case 22, a boss 21 a formed at the inner center of the front case 21, and a boss 22 a formed at the inner center of the back case 22. A switch board 23 is disposed between the two. The front case 21, the switch board 23, and the back case 22 are fixed with screws C.
[0030]
The front case 21 is provided with an A operation element 24 and a B operation element 25 as operating members. The A operation element 24 is attached to the back side of the front case 21 via a hinge part 24a so that the head is exposed to the outside from a through hole 21b formed in the front case 21. Further, the B operator 25 is disposed so that its head is exposed to the outside from a through hole 21c formed in the front case 21, and the B operator 25 includes a seat plate 25a that contacts the switch board 23 side and a spring. The front case 21 is biased by 25b.
[0031]
A flexible operation switch 26 is disposed on the switch board 23 at a position facing the A operation element 24, and a pressure sensitive sensor 27 is disposed below the seat plate 25 a of the B operation element 25. The operation switch 26 is, for example, a switch (membrane switch or the like) that is turned on / off by a movable contact formed on the movable portion of the elastic thin film and a fixed contact on the switch board side. When the operating element 24 is released, it is turned off. The pressure sensor 27 has a resistance value that changes according to the pressing force. By pressing the B operation element 25, an output (for example, a voltage signal) corresponding to the pressing force can be obtained.
[0032]
A rib wall 3 formed integrally with the boss 22a and the like at the time of molding the back case 22 is erected inside the back case 22, and the rib wall 3 has a predetermined interval in a direction perpendicular to the surface of FIG. A plurality are formed apart from each other. The end surface 3a of the rib wall 3 has a horizontal flat portion 3a-1 that is flush with the end surface of the boss 22a at the central portion in the vicinity of the boss 22a, and further from the flat portion 3a-1 in the left-right direction in FIG. It has a curved surface portion 3a-2 that protrudes toward the switch substrate 23 so as to gradually move away from the facing surface of the switch substrate 23 as the distance from the switch substrate 23 increases.
[0033]
The above configuration is a specific example of claim 1, wherein the back case 22 is “frame”, the switch board 23 is “board”, the operation switch 26 or the pressure sensor 27 is “stopper”, A The operation element 24 or the B operation element 25 constitutes an “operation member”, the rib wall 3 constitutes a “displacement restriction limiter”, and the end surface 3a (or the curved surface portion 3a-2) of the rib wall 3 constitutes a “curved surface of the displacement restriction limiter”. ing. That is, the rib wall 3 is an end face whose distance from the switch board 23 increases as it moves away from the fixing part of the switch board 23 to the boss 22a (back case 22) toward the operation switch 26 when no load is applied to the switch board 23. 3a (curved surface portion 3a-1).
[0034]
The on / off of the operation switch 26 by the operation of the A operation element 24 and the output control of the pressure sensor 27 by the operation of the B operation element 25 are normally performed by the end portion of the switch substrate 23 and the curved surface portion 3a-2 of the rib wall 3. Are moved away from each other, and the vertical movement of the A operator 24 is restricted by the operation switch 26, and the vertical movement of the B operator 25 is restricted by the pressure sensor 27. On the other hand, when the A operation element 24 or the B operation element 25 is strongly pressed, it operates as follows.
[0035]
The switch board 23 is displaced by the pressing force that the operation switch 26 receives from the A operation element 24 or the pressing force that the pressure sensor 27 receives from the B operation element 25. The amount of displacement is restricted to a predetermined amount or less by the rib wall 3, and when the switch substrate 23 is displaced, the switch substrate 23 is displaced following the curved surface portion 3 a-2 of the rib wall 3. Therefore, as described in the first embodiment, the action of deforming the switch board 23 is distributed to each local part of the switch board 23, and the entire switch board 23 can be prevented from being broken or broken.
[0036]
In addition, no mechanical noise is generated. Furthermore, the stress directly applied to the operation switch 26 and the pressure sensor 27 due to the displacement (deflection) of the switch substrate 23 can be reduced, and the operation switch 26 and the pressure sensor 27 can be protected. Further, since the switch board 23 is fixed only at one boss 22b at the front and rear positions, it is easy to attach and remove.
[0037]
As a specific example of the electronic musical instrument of the second embodiment, the one shown in FIG. 3 can be considered. It can be applied to a part of the panel surface of the electronic keyboard instrument as shown in FIG. In this case, FIG. 2 corresponds to a cross-sectional view taken along the line AA in FIG. 3A. For example, the A operation element 24 selects on / off of a predetermined effect function, and the B operation element 25 determines the strength of the effect. It can also be controlled.
[0038]
In addition, as shown in FIG. 3B, the electronic musical instrument can be configured such that the player M holds it with both hands. In this case, FIG. 2 corresponds to the BB cross-sectional view of FIG. 3B, and the A operation element 24 performs on / off control of a predetermined effect function, the B operation element 25 performs effect intensity control, and the like. be able to. Alternatively, the switch substrate 23 may be a timbre switch substrate, with the switch operated by the A operator 24 or the B operator 25 as a timbre selection switch.
[0039]
(Third embodiment)
FIG. 4 is a cross-sectional view of an operating device (electronic device) to which the substrate holding structure of the third embodiment is applied. In this operating device, a half case 31 and a case 22 form a main body case, and a switch substrate 33 is disposed between bosses 31a and 32a formed inside the cases 31 and 32, respectively. The cases 31 and 32 and the switch board 33 are screwed by screws D and nuts E that penetrate the bosses 31 a and 32 a and the switch board 33.
[0040]
A slide operation element 34 as an operating member is disposed at the end of the cases 31 and 32. The slide operation element 34 includes fork-like operation claws 34a and 34b extending inwardly from through holes formed at ends of the cases 31 and 32. The end of the switch board 33 is located between the operation claws 34a and 34b, and two sensors 35a and 35b are disposed on both sides of the end. When the slide operation element 34 is operated as indicated by an arrow, the sensor 35a is activated by the operation claw 34a on the one hand, and the sensor 35b is activated by the operation claw 34b on the other hand.
[0041]
As in the second embodiment, the sensors 35a and 35b may be pressure-sensitive sensors that obtain an output (voltage signal) corresponding to the operating force of the slide operator 34, and are turned on / off by the operation of the slide operator 34. An operation switch to be turned off or another sensor may be used. Then, by operating the slide operator 34, signals obtained by the sensors 35a and 35b can be used for controlling the musical tone of the electronic musical instrument.
[0042]
Inside the cases 31 and 32, rib walls 4 and 4 formed integrally with the bosses 31a and 32a and the like when the cases 31 and 32 are formed stand upright, and the switch substrate 33 of the rib walls 4 and 4 is provided. The end surfaces 4a and 4a on the side are flush with the end surfaces of the bosses 31a and 32a on the side of the bosses 31a and 32a. It is a curved surface. That is, each rib wall 4, 4 is moved toward the sensor 35 a, 35 b from the portion of the switch substrate 33 fixed to the boss 31 a, 32 a (case 31, 32) when no load is applied to the switch substrate 33. It consists of end surfaces 4a and 4a where the space | interval becomes large.
[0043]
The above configuration is a specific example of claim 1, the cases 31 and 32 are “frames”, the switch board 33 is “boards”, the sensors 35 a and 35 b are “stoppers”, and the slide operator 34. Are the “operation members”, the rib walls 4 and 4 are the “displacement restriction limiter”, and the end surfaces 4 a and 4 a of the rib walls 4 and 4 are the “curved surface of the displacement restriction limiter”. That is, this third embodiment includes two sets of the configuration of claim 1.
[0044]
The operation of the sensors 35a and 35b by the operation of the slide operator 34 can be performed from a state in which the end portion of the switch substrate 33 and the end surfaces 4a and 4a of the rib walls 4 and 4 are separated from each other. 34 slide operation is restricted to some extent by the sensors 35a and 35b. On the other hand, when the slide operation element 34 is operated strongly, the switch board 33 is displaced by the pressing force applied to the sensors 35a, 35b from the operation claws 34a, 34b. Is regulated to a predetermined amount or less.
[0045]
Since the switch board 33 is displaced along the end face 4a of the rib wall 4 as in the above embodiments, the action of deforming the switch board 33 is distributed to each local part of the switch board 33, and the switch board 33 It is possible to prevent the entire 33 from being broken or broken. In addition, no mechanical noise is generated. Furthermore, the stress directly applied to the sensors 35a and 35b due to the displacement of the switch substrate 33 can be reduced, and the sensors 35a and 35b can be protected. Further, since the switch board 33 is fixed at one place, it can be easily attached and detached.
[0046]
(Modification)
In the first to third embodiments described above, the rib walls 2, 3, 4 as displacement restriction limiters are, for example, a part (or several places) in the key arrangement direction with respect to the surfaces of the switch boards 12, 23, 33. For example, a modification shown in FIG. 5 may be used. This example shows a case of a modification of the first embodiment, and a lower surface of the lower case 11 is formed so as to protrude toward the inside of the musical instrument (switch board 12 side) to constitute a displacement restriction limiter 2 '. A surface of the displacement restriction limiter 2 'that faces the back surface of the switch substrate 12 is a curved surface 2a'.
[0047]
The curved surface 2 a ′ is configured to abut a wide surface (a surface extending in the key arrangement direction) with respect to the back surface of the switch substrate 12. As a result, the same effects as those of the first embodiment can be obtained, and the recess 11d is formed on the back side of the lower case 11, so that the recess 11d may be used as the battery housing portion. A detachable battery lid 11e is attached to the recess 11d. In this manner, the curved surface of the displacement restriction limiter can be made a wide surface as in the second and third embodiments.
[0048]
(Fourth embodiment)
FIG. 7 is a right side view of an electronic piano keyboard device to which the substrate holding structure of the fourth embodiment is applied. In this keyboard apparatus, the entire key is supported by the keyboard frame 100, and the keyboard frame 100 is supported by the shelf board 101. The key 40 is composed of a white key and a black key, and each key is supported by the support portion 41 so as to be rotatable around the rotation center R40 in the vertical direction slightly behind the center of the keyboard frame 100. The mass body 50 is supported by the keyboard frame 100 below the key 40. The mass body 50 as a whole extends substantially horizontally in the front-rear direction, and rotates with the tip end portion of the support piece 102 erected at the front position of the keyboard frame 100 as a rotation center R50.
[0049]
In order to hold the mass body 50 with these support pieces 102, one end of the S-shaped spring 42 presses the recess 52 on the opposite side of the support piece 102 of the mass body 50. The recess 52 is formed of a rib having a constant width in the thickness direction of the mass body 50, and a thin plate portion extends vertically in the center of the recess 52 in the width direction of the rib. The end of the S-shaped spring 42 that engages with the recess 52 is bifurcated with a slit in the center, and the thin plate portion is inserted into the slit for engagement. The middle portion of the S-shaped spring 42 is in contact with the edge of the spring through hole 103 at the approximately center in the front-rear direction of the upper part of the keyboard frame 100, and the other end of the S-shaped spring 42 is a spring at the lower rear of the key. It is comprised so that the receiving part 43 may be pressed. As a result, the S-shaped spring 42 acts to press the mass body 50 against the distal end portion of the support piece 102 at the position of the recess 52 and to push down the rear portion of the mass body 50 from the rotation center R50.
[0050]
The front end portion of the mass body 50 is in contact with the lower end portion of the hanging piece 44 of the key 40, and is rotated in conjunction with the key when the key 40 is pressed. Near the lower part of the front end of the mass body 50, a switch board 60 is supported by a keyboard frame 100, and a key switch 61 is fixed on the switch board 60. On the lower surface of the front portion of the mass body 50, a switch drive unit 53 having a pair of legs extending downward at a position corresponding to the key switch 61 is provided. The switch driving unit 53, the switch substrate 60, and the key switch 61 constitute a key pressing switch that senses the key pressing speed.
[0051]
The mass body 50 extends to the rear portion of the keyboard frame 100 and is supported in the vicinity of the rear end portion by a felt stopper member 104 fixed on the keyboard frame 100 in the rest position (non-key-pressed state). When the key 40 is depressed, the mass body 50 moves from the rest position indicated by the solid line in FIG. 7 to the key depression position indicated by the alternate long and short dash line. A stopper member 105 is held immediately behind the key 40 in the keyboard frame 100 and serves to stop the mass body 50 that has reached the key pressing position. The stopper member 105 covers the cushioning felt 105a with a protective sheet 105b, and the contact portion 54 at the rear end of the mass body 50 presses the buffering felt 105a through the protective sheet 105b. The cushioning felt 105a is usually configured by overlapping felts having different hardnesses so as to provide a buffering action against the collision of the mass body 50 contact portion 54 and a reliable stop feeling against the player's fingers. The mass body 50 is made of plastic from the front part to the vicinity of the rotation center R50, and is formed so that a metal bar extends from the rear part. The mass of the metal bar extending backwards causes inertia at the time of key depression. Causes resistance.
[0052]
A sensor device 70 is attached to the rear part of the keyboard frame 100. The sensor device 70 generally has a structure in which two tension members are supported on both sides of the keyboard. Of the two tension members, one tension member 71 is for sensing, and is held between the cushioning felt 105a of the stopper member 105 and the protective sheet 105b, and extends toward the front of the keyboard device. Yes. The other tension member 72 is for compensation provided in order to prevent a decrease in sensitivity of the tension member 71 for sensing due to a disturbance factor. The compensation tension member 72 extends in parallel with the sensing tension member 71 at a position slightly away from the stopper member 105 so as not to contact the mass body 50.
[0053]
A tensioning portion (not shown) supported by the keyboard frame 100 is provided outside the left end of the keyboard row. Each of the sensing tensioning member 71 and the compensation tensioning member 72 is provided by a tensioning leaf spring of the tensioning portion. One end is supported to be pulled. A detection unit 80 supported by the keyboard frame 100 is provided outside the right end of the keyboard row. The detection unit 80 has a structure in which a detection leaf spring 82 extends from the detection circuit board 81. The detection leaf spring 82 is in the form of a leaf spring, the base end portion is fixed to the detection circuit board 81 with screws 88, 88, and the distal end portion is formed with a small groove to pull the end portion of the sensing tension member 71. I support it. A strain sensor 83 is attached near the base end of the detection leaf spring 82. In this example, the strain sensor 83 is configured using a piezo element. The detection circuit board 81 is provided with a circuit (not shown) for detecting an output signal from the strain sensor 83 and an adjustment element 84 for fine adjustment thereof.
[0054]
In the sensor device 70, the following settings are further made. The tension leaf spring is stronger than the detection leaf spring 82. Further, the tension member 72 for compensation has a higher tensile rigidity than the tension member 71 for sensing. In other words, the compensation tension member 72 is fixedly supported at the right end by the keyboard frame 100 and pulled at the left end by the tension leaf spring to be in a predetermined extension state. On the other hand, the tensioning member 71 for sensing is held at the left end position together with the tensioning member 72 for compensation with the tensioning leaf spring as a joint holding part. Further, the right end is held at the free end of the detection leaf spring 82 so as to bend the detection leaf spring 82. Accordingly, in order to stabilize the position of the left end in a state where the compensation tension member 72 is pulled, the tension force of the tension leaf spring is increased so that the detection leaf spring 82 is not greatly bent. The tension rigidity of the tension member 72 is increased.
[0055]
Next, the operation of this keyboard apparatus will be described. When the key is pressed from the state of FIG. 7, the key 40 rotates downward about the rotation center R <b> 40, and the hanging piece 44 pushes down the mass body 50. As a result, the mass body 50 rotates about the rotation center R50, and the switch drive unit 53 contacts the key switch 61 to turn on the key switch and operate the sound generation mechanism to generate sound. During this time, the mass body 50 raises the rear part from the rotation center R50. Immediately after the switch drive unit 53 comes into contact with the key switch 61, the abutment portion 54 at the rear end of the mass body 50 abuts against the stopper member 105, whereby the rotation of the mass body 50 and the key 40 is stopped. .
[0056]
The sensor device 70 is an after sensor and operates as follows. When the key pressing force is increased or decreased in the key-pressed state, the contact portion 54 at the rear end of the mass body 50 changes the amount of bending of the stopper member 105, particularly the buffer felt 105a, and sensing is performed when this amount of bending changes. The meandering amount of the tension member 71 also changes. When the meandering amount increases, the bending of the detection leaf spring 82 increases, and the output of the strain sensor 83 increases. By picking up this output change, it is possible to detect a change in the pressing force applied to the key after the key is pressed. If the volume, sound quality, etc. are changed accordingly, after-touch control can be performed. Further, by appropriately selecting the flexibility of the cushioning felt 105a and the protective sheet 105b of the stopper member 105, even when a plurality of keys are pressed, the bending of the stopper member 105 due to each key pressing is used for sensing. Reflecting the meandering of the tension member 71, accurate aftertouch control can be performed.
[0057]
The sensor device 70 is provided with a sensing tension member 71 in parallel with the compensation tension member 72, and the tension force of the tension plate spring is applied to the compensation tension member 72 and the sensing tension member 71. The sensing tensioning member 71 itself receives the spring force of the detection leaf spring 82 by acting and supporting one end. As a result, even if a disturbance factor such as a change in the length of the tension member due to an external force at the time of attachment or a temperature rise acts, the influence is absorbed by the compensation tension member 72, and the sensing tension member The spread to 71 is prevented.
[0058]
FIG. 6 is a view showing the main part of the fourth embodiment, and shows the positional relationship between the keyboard frame 100 and the attachment structure in the vicinity of the stopper member 105 and the contact part 54 of the mass body 50. The stopper member 105 is held by a keyboard frame 100, and a protective substrate 5 is attached to the back surface of the keyboard frame 100 on the mass body 50 side.
[0059]
Here, when a strong pressing force is applied to the keyboard, the abutting portion 54 of the mass body 50 greatly deforms the cushioning felt 105a, but the protective substrate 5 has its end 5a abutting against the mass body 50. The operation of the mass body 50 is regulated to some extent by contacting the portion 54. Thereby, the buffer felt 105a and the sensor device 70 (or the sensing tension member 71) are protected. That is, the protective substrate 5 is a substrate for preventing mass body stopper destruction that prevents deterioration of the buffer felt 105a (mass body stopper such as felt), and the sensor device 70 (after sensor destruction prevention for preventing destruction of the after sensor). It is also a substrate for use.
[0060]
Further, if the protective substrate 5 is hard and hardly deformed, the mass body 50 itself is destroyed when a stronger pressing force is applied. Therefore, the protective substrate 5 has elasticity and is stronger. When a pressing force is applied, it also has a role of protecting the mass body 50 by being displaced toward the keyboard frame 100 side.
[0061]
The keyboard frame 100 and the protective substrate 5 are separated from each other in the vicinity of the stopper member 105, and a rib wall 6 is erected at the separated portion. The end surface 6a of the rib wall 6 on the protective substrate 5 side is a curved surface that protrudes toward the protective substrate 5 from the contact end between the keyboard frame 100 and the protective substrate 5 to the stopper member 105 side. That is, the rib wall 6 has a curved surface in which the distance from the protective substrate 5 increases as the distance from the fixing portion of the protective substrate 5 to the keyboard frame 100 in the direction of the end 5a is increased when no load is applied to the protective substrate 5. .
[0062]
The above configuration is a specific example of claim 1. The keyboard frame 100 is a “frame”, the protective substrate 5 is a “substrate”, the end 5a of the protective substrate 5 is a “stopper portion”, and the mass body. Reference numeral 50 denotes an “operation member”, the rib wall 6 forms a “displacement restriction limiter”, and the end surface 6 a of the rib wall 6 forms a “curved surface of a displacement restriction limiter”.
[0063]
When the operation of the mass body 50 becomes strong, the protective substrate 5 is displaced by the pressing force applied to the end portion 5a of the protective substrate 5 from the contact portion 54, but this displacement amount is restricted to a predetermined amount or less by the rib wall 6. The Since the protective substrate 5 is displaced following the end face 6a of the rib wall 6 as in the above embodiments, the action of deforming the protective substrate 5 is distributed to each local portion of the protective substrate 5, and the protective substrate 5 can be prevented from cracking or breaking. In addition, no mechanical noise is generated. Furthermore, the stress applied to the mass body 50 due to the displacement of the protective substrate 5 can be reduced, and the mass body 50 can be protected.
[0064]
Each embodiment has been described above, but the curved surfaces of the end surfaces 2a, 3a, 4a, and 6a of the rib walls 2, 3, 4, and 6 in each embodiment may be arcuate. For example, the first embodiment will be described as an example. The switch board 12 has a constant thickness in the front-rear direction of the electronic musical instrument and a constant width in the left-right direction, and the switch board 12 in the front-rear direction when the switch board 12 is displaced (bent) The maximum deformation allowed (not broken) in all parts is that the outer edge bending stress of the switch board 12 (the tension acting parallel to the surface on the convex side of the bent shape) is constant over the entire area in the front-rear direction of the board at the maximum allowable value. Value. Accordingly, the switch substrate 12 may be configured such that the degree of deformation is constant over the entire area in the front-rear direction of the substrate, that is, a constant radius of curvature. This radius of curvature can be determined from the allowable maximum values of the Young's modulus, thickness, and outer edge bending stress of the substrate. As a result, the stress applied to the switch substrate 12 is evenly distributed.
[0065]
Also, the thickness of the substrate changes as it goes in the longitudinal direction of the substrate (the direction toward the force point where the pressing force is applied from the fixed part), and the width in the direction perpendicular to the longitudinal direction changes as it goes in this longitudinal direction. In this case, the permissible maximum value of the outer edge bending stress of a local portion in the longitudinal direction of the substrate differs with respect to the force of bending the substrate. In such a case, the shape of the curved surface may be determined according to the shape of the substrate.
[0066]
In each embodiment, the curved surface of the displacement restriction limiter is a continuous surface in the longitudinal direction of the substrate. However, the curved surface may be a discontinuous surface in the longitudinal direction of the substrate. However, the width between the discontinuous surfaces is smaller than the length in the longitudinal direction of the substrate.
[0067]
In each embodiment, the case where the present invention is mainly applied to an electronic musical instrument has been described. However, the present invention can also be applied to other electronic devices. For example, in a game machine, the present invention can be applied to protect a switch board that detects the operation of the operation element from a severe operation of the operation element.
[0068]
【The invention's effect】
According to the substrate holding structure of the electronic device according to claim 1, when the substrate is displaced by an operation member such as an operation element, the action of deforming the substrate is performed in each local part of the substrate as the displacement proceeds. Since it is dispersed, the entire substrate can be prevented from cracking or breaking. Further, since each part of the substrate simply contacts the displacement regulation limiter successively following the part that is already in contact with the displacement regulation limiter, no mechanical noise is generated. Further, since the substrate is displaced (bends) with respect to the applied stress, the stress directly applied to the switch or sensor can be reduced, and the switch or sensor can be protected. Further, since the substrate can be fixed only by at least one fixing portion at the front and rear positions, attachment and removal are easy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a keyboard device to which a substrate holding structure according to a first embodiment of the present invention is applied.
FIG. 2 is a cross-sectional view of an electronic musical instrument to which a substrate holding structure according to a second embodiment of the present invention is applied.
FIG. 3 is a diagram showing a specific example of an electronic musical instrument according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view of an operating device to which a substrate holding structure according to a third embodiment of the present invention is applied.
FIG. 5 is a diagram showing a modification according to the first to third embodiments of the present invention.
FIG. 6 is a diagram showing a main part of a fourth embodiment of the present invention.
FIG. 7 is a right side view of an electronic piano keyboard device to which a substrate holding structure according to a fourth embodiment of the present invention is applied.
FIG. 8 is a diagram showing an example of a switch board mounting structure in a conventional electronic keyboard instrument.
[Explanation of symbols]
2 ... rib wall (displacement restriction limiter), 2a ... end face (curved surface of displacement restriction limiter), 11 ... lower case (frame), 12 ... switch board (board), 12a ... key stopper (stopper part), 13, 14 ... Key (operation member), 3 ... rib wall (displacement restriction limiter), 3a ... end face (curved surface of displacement restriction limiter), 22 ... back case (frame), 23 ... switch board (board), 24 ... A operator (operation) Members), 25... B operation element (operation member), 26... Operation switch (stopper part), 27... Pressure-sensitive sensor (stopper part), 31 and 32 .. case (frame), 33. ... Slide operation element (operation member), 35a, 35b ... Sensor (stopper part), 4 ... Rib wall (displacement restriction limiter), 4a ... End face (curved surface of displacement restriction limiter), 2 '... Displacement restriction limiter, 2a ... curved surface of displacement restriction limiter, 100 ... keyboard frame (frame), 50 ... mass body (operation member), 5 ... protection substrate (substrate), 5a ... end (stopper part), 6 ... rib wall (displacement restriction limiter) , 6a ... End face (curved surface of displacement restriction limiter)

Claims (1)

Frame,
A substrate partially secured to the frame;
A stopper portion present at a position spaced from the part of the substrate;
An operation member whose operation is restricted by the stopper portion;
A substrate holding structure for an electronic device having
The substrate is configured to be displaced by a pressing force from the operating member,
A displacement restriction limiter for restricting the substrate from being able to be displaced by a pressing force received by the stopper when the operation of the operation member is regulated by the stopper;
The substrate holding structure for an electronic device, wherein the displacement restriction limiter is formed of a curved surface that increases in distance from the substrate toward the stopper portion from the part of the substrate when no load is applied to the substrate.

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