JP2004020681A - Substrate holding structure for electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an entire switch substrate from being cracked or broken due to a high pressure to keys 13 and 14 in a keyboard instrument and to easily attach and detach the switch substrate. <P>SOLUTION: A fin 1 and rib walls 2 are stood on a lower case 11. A plurality of rib walls 2 are formed in a key array direction at intervals of 3 or 4 keys or a half octave. The switch substrate 12 is fixed in a part of one boss 11b. End faces 2a of rib walls 2 are formed into upward projecting curved surfaces connecting from bosses 11b to an end face 1a of the fin 1. Depression operation of the key 13 is controlled by a key stopper 12a of the switch substrate 12, and an extent of displacement of the switch substrate 12 is controlled to a prescribed extent or smaller by the rib wall 12 when the switch substrate 12 is displaced. The switch substrate 12 is brought into contact with the end face 2a and is displaced along the end face 2a when the switch substrate 12 is displaced. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic device such as an electronic musical instrument having a controller, a keyboard, and the like, and relates to a board holding structure such as a circuit board provided 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 provided under a key in order to detect a key press or the like on a keyboard. FIG. 8 is a diagram showing an example of a mounting structure of a switch board in a conventional electronic keyboard instrument. In the lower case 11, bosses 11a and 11b are respectively formed on the near side (the player side) and the back side (the side opposite to the player), 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, and the base ends 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, and are arranged on the switch board 12. The switch board 12, the base ends 14a and 13a are fixed by screws A at the boss 11b on the back side, and the upper case 15 is disposed on the base ends 13a and 14a. The front end of the switch board 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 portions 13a and 14a. The black key 13 and the white key 14 are substantially similar to the base portions 13a and 14a. It can swing as a fulcrum. A key switch 16 for detecting pressing of a black key 13 and a white key 14 and the like is mounted on the switch board 12. In FIG. 8, only the key switch 16 for the black key 13 is shown. Further, a key stopper 12a is attached to a front end portion of the switch board 12. The tip 14 c of the white key 14 is inserted between the lower case 11 and the upper case 15 at the front end of the case, and the upper case 15 has a key stopper 17 and the lower case 11 has a key stopper 18. Installed.
[0004]
With the above configuration, when the black key 13 is pressed, the lower end surface 13c of the black key 13 contacts the key stopper 12a, and the lower end position is regulated. Further, the tip portion 14c, which is to press 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 press or the like by a 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-mentioned conventional structure, when the electronic musical instrument is dropped on the floor or a child rides on the keyboard, a force greater than a normal expected force at the time of playing is applied to the switch board 12 and the key switch 16, The switch substrate 12, the key switch 16, or the key itself may be broken. In order to prevent this, it is conceivable to increase the thickness of the key stoppers 12a and 18; however, since the key stoppers 12a and 18 are formed of felt or the like, the key stoppers 12a and 18 are particularly crushed by a force greater than an assumed force. As a result, there is a problem that the touch (operation feeling) of the keyboard is deteriorated. In addition, a thick key stopper causes a problem that it cannot withstand aging even in a normal performance. Further, since the switch board 12 is fixed by two bosses 11a and 11b in the front-rear direction, when mounting the switch board 12, for example, four screws are usually required to be fixed to one board. It is troublesome.
[0006]
In addition, as shown by a dashed line in FIG. 8, for example, it is conceivable to eliminate the boss 11a and provide a limiter 11a 'such as a protrusion at a space D below the front end of the switch substrate 12. As a result, even when a force higher than the normal expected force is applied to the switch substrate 12, the switch substrate 12 bends downward and stops when the switch substrate 12 (the end) contacts the limiter 11a '. I 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, in consideration of prevention of breakage of the switch substrate 12 due to bending, the distance D between the limiter 11a 'and the switch substrate 12 cannot be so large. For example, when the key of Fortissimo is pressed strongly, the switch substrate 12 comes into contact with the limiter 11a'. Therefore, mechanical noise may be generated. Further, since the switch substrate 12 is fixed at one position of the boss 11b and the switch substrate 12 is a single fulcrum (as viewed on the cross section), there is a problem that the switch substrate 12 becomes extremely fatigued at this fulcrum.
[0007]
The above description relates to the interference between the key and the switch board in the electronic keyboard instrument, but such a problem is particularly caused by some manually driven operator and the board displaced by driving the operator, or This also occurs in an electronic device including a switch, a sensor, and the like that are driven by operation of an operation element.
[0008]
The present invention has been made in view of the above-described problems, and has a structure in which the substrate is durable by preventing the substrate from being cracked or broken by driving the operation element, and does not generate mechanical noise when operating the operation element. Another object of the present invention is to provide a substrate holding structure for an electronic device, which can protect a switch, a sensor, or an operation element, and can easily attach and detach a substrate.
[0009]
[Means for Solving the Problems]
A substrate holding structure for an electronic device according to claim 1 of the present invention includes a frame, a substrate having a part fixed to the frame, a stopper located at a position separated from the part of the substrate, and a stopper. A substrate holding structure for an electronic device having an operation member whose operation is restricted, wherein the substrate can be displaced by a pressing force received by the stopper portion when the operation of the operation member is restricted by the stopper portion, by a predetermined amount or less. Wherein the displacement limiting limiter is formed of a curved surface in which the distance between the displacement limiting limiter and the substrate increases as the distance from the part of the substrate toward the stopper increases when no load is applied to the substrate. And
[0010]
According to the substrate holding structure of the electronic device of the present invention, when the operation of the operating member (operator or the like) is restricted by the stopper of the substrate (a stopper of the member separate from the substrate or a part of the substrate), the stopper is The substrate is displaced by the pressing force received from the operating member, and the amount of this displacement is regulated to a predetermined amount or less by the displacement regulating limiter. The displacement limiting limiter has a curved surface in which, when no load is applied to the substrate, the distance between the substrate (the portion fixed to the frame) and the substrate increases as the distance from the substrate toward the stopper increases. When displacing, the substrate contacts the curved surface and displaces following the curved surface.
[0011]
Therefore, in the process of the displacement of the substrate, the portion of the substrate already in contact with the displacement limiting limiter is not further displaced, and the local displacement (deformation) of the non-contact portion is caused by the displacement of the contact portion. Can be suppressed. That is, as a result, the action of deforming the substrate due to the applied stress is dispersed in each local portion of the substrate, so that the entire substrate can be prevented from being cracked or broken.
[0012]
Further, since each part of the substrate only comes into contact with the displacement restriction limiter sequentially following the part already in contact with the displacement restriction limiter, no mechanical noise is generated.
[0013]
Further, since the substrate is displaced (bent) in response to the applied stress, the stress directly applied to the switch or the sensor can be reduced, and the switch or the sensor can be protected.
[0014]
Furthermore, since the substrate can be fixed by at least one fixing portion at the front and rear positions, attachment and detachment are easy.
[0015]
The board can be various boards such as a switch board provided with a switch corresponding to an operator, a key switch board provided with a key switch, a tone switch board provided with a tone selection switch and the like.
[0016]
For example, as in a first embodiment described later, the operation member is a key of a keyboard, and the substrate is displaced by receiving a pressing force by a key as the operation member, and a key stopper such as felt ( For example, a board (for example, the switch board 12) for preventing the keyboard stopper from being broken to prevent the deterioration of the key stopper 12a) may be used.
[0017]
For example, as in a fourth embodiment described later, the operating member is a mass body (a key hammer for imitating a key touch by an action assembly in an acoustic piano) linked to a key press on a keyboard, and the board is A substrate (protective substrate 5) for preventing the destruction of the mass stopper, which receives the pressing force by the mass as a member and restricts the operation of the mass to some extent, and prevents the deterioration of the mass stopper (eg, stopper member 105) such as felt. ).
[0018]
For example, as in a fourth embodiment to be described later, the operating member is a mass (key hammer) that is interlocked with key depression on a keyboard, and includes an after sensor (for example, a sensor device 70) driven by the mass, and the substrate is Alternatively, a substrate (for example, the protection substrate 5) for preventing after-sensor destruction, which receives a pressing force from the mass as the operating member, restricts the operation of the mass to some extent, and prevents destruction of the after-sensor.
[0019]
For example, as in a second embodiment described later, in the displacement regulating limiter, a position where separation from the substrate starts (for example, a 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 determined. It may be a position on the side of the stopper portion away from the fixing portion for fixing the substrate.
[0020]
For example, as in a later-described fourth embodiment, the stopper portion may be a part of the substrate (for example, the end 5a of the protection substrate 5), or may be provided on the substrate as in a later-described first embodiment. An operating member displacement stopper (for example, a key stopper 12a) which is a separate member from the provided substrate may be used.
[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, a key stopper 12a).
[0022]
For example, as in a fourth embodiment described later, the operating member may be the mass body (for example, the mass body 50), and the operating member displacement stopper may be a mass body stopper (for example, the stopper member 105).
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1st Embodiment)
FIG. 1 is a cross-sectional view of a keyboard device to which the board holding structure of the first embodiment is applied, and the same elements as those in FIG. 8 are denoted by the same reference numerals as in FIG. 8 and detailed description is omitted. The lower case 11 as a frame is made of a synthetic resin, and a fin 1 extending in the direction in which the keys 13 and 14 are arranged is provided upright on the inner side of the bottom surface of the lower case 11. Is provided with a rib wall 2. Note that the fin 1 and the rib wall 2 are integrally formed together with the boss 11b and the like when the lower case 11 is formed. The fins 1 are formed to be long in the direction in which the keys are arranged in correspondence with all the keys, but the rib wall 2 is a plate having a predetermined thickness, and every three to four keys, every half octave, or one octave. A plurality of octaves are formed at a distance from each other in the key arrangement direction.
[0024]
The height of the fin 1 is lower than the height of the boss 11b, and the end face 2a of the rib wall 2 facing the switch board 12 has its boss 11b side flush with the end face 11a-1 of the boss 11b. It has a slightly upwardly curved surface that extends from the boss 11b to the end surface 1a of the fin 1. The end surface 1a of the fin 1 is an inclined surface with the front side of the musical instrument (the performer side, the same applies hereinafter) lowered so that the end surface 1a of the fin 1 is smoothly connected to the end surface 2a of the rib wall 2. As a result, a gap is formed between the switch board 12 and the rib wall 2 and the fin 1, the gap increasing with distance from the boss 11b. The fin 1 is located below a key stopper 12a provided at an end of the switch substrate 12.
[0025]
The above configuration is a detailed specific example of claim 1, wherein the lower frame 11 is a "frame", the switch substrate 12 is a "substrate", the key stopper 12a is a "stopper portion", and the black key 13 is an "operating member". , The rib wall 2 constitutes a “displacement limiting limiter”, and the end face 2 a of the rib wall 2 constitutes a “curved surface of the displacement limiting limiter”.
[0026]
That is, the lower case 11 (frame), the switch substrate 12 (substrate) having a part (fixed portion with the boss 11 b) fixed to the lower case 11, and the switch substrate 12 are located at positions separated from the part. The electronic device has a substrate holding structure including 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 limiting limiter) is provided for restricting the switch board 12 from being displaced by a pressing force received by the key stopper 12a to a predetermined amount or less when the operation of the black key 13 is restricted by the key stopper 12a. The rib wall 2 has an end face where the distance between the switch board 12 and the switch board 12 increases as the distance from the part (the portion fixed to the boss 11b) of the switch board 12 toward the key stopper 12a increases 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 substrate 12, the switch substrate 12 is displaced by the pressing force received from the black key 13 by the key stopper 12a. The amount is regulated by the rib wall 2 to a predetermined amount or less. When the switch board 12 is displaced, the switch board 12 comes into contact with the end face 2a and is displaced following the end face 2a. Therefore, in the process of the displacement of the switch substrate 12, the portion of the switch substrate 12 already in contact with the rib wall 2 (end surface 2 a) is not further displaced, and the non-contact portion (the portion on the front side of the contact portion). ), The local displacement (deformation) is suppressed by the displacement of the contact portion. That is, since the action of deforming the switch board 12 is distributed to each local portion of the switch board 12, it is possible to prevent the entire switch board 12 from being cracked or broken.
[0028]
Further, since each part of the switch board 12 only comes into contact with the rib wall 2 successively following the part already in contact with the rib wall 2, no mechanical noise is generated. Further, since the switch substrate 12 is displaced (bent) in response 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 the one boss 11b at the front and rear positions, it is easy to mount and remove.
[0029]
(2nd Embodiment)
FIG. 2 is a sectional view of an electronic musical instrument to which the substrate holding structure according to the second embodiment is applied. In this electronic musical instrument, a main body case is formed by half of a front case 21 and a back case 22, and a boss 21 a formed at the center of the inside of the front case 21 and a boss 22 a formed at the center of the inside of the back case 22. A switch board 23 is provided between the two. The front case 21, the switch board 23 and the back case 22 are screwed 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 rear side of the front case 21 via a hinge portion 24a such that the head is exposed to the outside through a through hole 21b formed in the front case 21. The B operation element 25 is disposed such that its head is exposed to the outside through a through hole 21c formed in the front case 21. The B operation element 25 includes a seat plate 25a and a spring 25b urges the front side of the front case 21.
[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 a switch (membrane switch or the like) that is turned on and off by a movable contact formed on a movable portion of an elastic thin film and a fixed contact on the switch substrate side. When the operator 24 is released, the switch is turned off. The pressure-sensitive sensor 27 changes its resistance value in accordance with the pressing force. When the B operation element 25 is pressed, an output (for example, a voltage signal) corresponding to the pressing force can be obtained.
[0032]
Inside the back case 22, a rib wall 3 formed integrally with the boss 22a and the like at the time of molding the back case 22 is provided upright. The rib wall 3 has a predetermined interval in a direction perpendicular to the plane of FIG. Are formed at a distance from each other. The end surface 3a of the rib wall 3 has a horizontal flat portion 3a-1 flush with the end surface of the boss 22a at the center near the boss 22a, and further from the flat portion 3a-1 in the horizontal direction of FIG. It has a curved surface portion 3a-2 protruding toward the switch substrate 23 side so as to gradually separate from the opposing surface of the switch substrate 23 as the distance increases.
[0033]
Note that the above configuration is a detailed specific example of claim 1, wherein the back case 22 is a "frame", the switch board 23 is a "board", the operation switch 26 or the pressure sensor 27 is a "stopper section", and A The manipulator 24 or the B manipulator 25 constitutes an “operating member”, the rib wall 3 constitutes a “displacement limiting limiter”, and the end face 3a (or the curved surface portion 3a-2) of the rib wall 3 constitutes a “curved surface of the displacement limiting limiter”. ing. In other words, the rib wall 3 has an end face where the distance between the switch board 23 and the switch board 23 increases as the distance from the fixed portion of the switch board 23 to the boss 22a (back case 22) toward the operation switch 26 increases when no load is applied to the switch board 23. 3a (curved surface portion 3a-1).
[0034]
The on / off operation of the operation switch 26 by the operation of the A operation element 24 and the output control of the pressure-sensitive sensor 27 by the operation of the B operation element 25 are usually performed by the end of the switch substrate 23 and the curved surface 3a-2 of the rib wall 3. The vertical movement of the A operation element 24 is regulated by the operation switch 26, and the vertical movement of the B operation element 25 is regulated by the pressure-sensitive sensor 27. On the other hand, when the A operator 24 or the B operator 25 is strongly pressed, the following operation is performed.
[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-sensitive sensor 27 receives from the B operation element 25. This displacement amount is regulated to a predetermined amount or less by the rib wall 3, and when the switch board 23 is displaced, the switch board 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 portion of the switch board 23, and the entire switch board 23 can be prevented from being broken or broken.
[0036]
Also, no mechanical noise is generated. Further, the stress applied directly to the operation switch 26 and the pressure sensor 27 due to the displacement (bending) of the switch substrate 23 can be reduced, and the operation switch 26 and the pressure sensor 27 can be protected. In addition, since the switch board 23 is fixed only at the one boss 22b at the front and rear positions, it is easy to mount and remove.
[0037]
FIG. 3 shows a specific example of the electronic musical instrument according to the second embodiment. As shown in FIG. 3A, the present invention can be applied to a part of a panel surface of an electronic keyboard instrument. In this case, FIG. 2 corresponds to a sectional view taken along line AA of FIG. 3A. For example, on / off of a predetermined effect function is selected by the A operation element 24, and the strength of the effect is selected by the B operation element 25. It can also be controlled.
[0038]
Further, as shown in FIG. 3 (B), an electronic musical instrument in which the player M holds and plays with both hands can be provided. In this case, FIG. 2 corresponds to a cross-sectional view taken along the line BB of FIG. 3B. For example, on / off control of a predetermined effect function is performed by the A operation element 24, and effect intensity control is performed by the B operation element 25. be able to. Further, the switch operated by the A operator 24 or the B operator 25 may be used as a tone selection switch, and the switch board 23 may be a tone switch board.
[0039]
(Third embodiment)
FIG. 4 is a sectional view of an operation device (electronic device) to which the substrate holding structure according to 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 board 33 is disposed between bosses 31 a and 32 a 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 penetrating the bosses 31 a and 32 a and the switch board 33.
[0040]
At the ends of the cases 31, 32, a slide operator 34 as an operating member is provided. The slide operation member 34 includes fork-shaped operation claws 34 a and 34 b extending inward from through holes formed at the ends of the cases 31 and 32. An end of the switch board 33 is located between the operation claws 34a and 34b, and two sensors 35a and 35b are provided on both surfaces of the end. When the slide operator 34 is operated as shown by an arrow, the sensor 35a is operated by the operation claw 34a on the one hand, and the sensor 35b is operated by the operation claw 34b on the other hand.
[0041]
Note that the sensors 35a and 35b may be pressure-sensitive sensors that obtain an output (voltage signal) according to the operation force of the slide operator 34, as in the second embodiment. An operation switch for turning off or another sensor may be used. Then, by operating the slide operator 34, the signals obtained by the sensors 35a and 35b can be used for controlling the tone of the electronic musical instrument.
[0042]
Inside the cases 31, 32, bosses 31a, 32a and the like are provided with rib walls 4, 4 integrally formed when the cases 31, 32 are formed. Of the bosses 31a, 32a are flush with the end surfaces of the bosses 31a, 32a. It is a curved surface. That is, when no load is applied to the switch board 33, the rib walls 4 and 4 move away from the fixed portions of the switch board 33 to the bosses 31a and 32a (cases 31 and 32) in the direction of the sensors 35a and 35b. And the end faces 4a, 4a having a large interval between them.
[0043]
Note that the above configuration is a detailed specific example of claim 1, wherein the cases 31 and 32 are “frames”, the switch substrates 33 are “substrates”, the sensors 35 a and 35 b are “stoppers”, and the slide operators 34. Represents an “operating member”, the rib walls 4 and 4 constitute a “displacement restricting limiter”, and the end surfaces 4a and 4a of the rib walls 4 and 4 constitute a “curved surface of the displacement restricting limiter”. That is, the third embodiment has 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 where the end of the switch board 33 and the end surfaces 4a and 4a of the rib walls 4 and 4 are separated from each other. The sliding operation of the actuator 34 is regulated to some extent by the sensors 35a and 35b. On the other hand, when the slide operation member 34 is strongly operated, the switch board 33 is displaced by the pressing force applied from the operation claws 34a, 34b to the sensors 35a, 35b. Is regulated to a predetermined amount or less.
[0045]
Then, as in the above embodiments, the switch board 33 is displaced following the end face 4a of the rib wall 4, so that the action of deforming the switch board 33 is distributed to local portions of the switch board 33, and 33 can be prevented from being broken or broken. Also, no mechanical noise is generated. Further, the stress directly applied to the sensors 35a and 35b due to the displacement of the switch board 33 can be reduced, and the sensors 35a and 35b can be protected. In addition, since the switch board 33 is fixed at one place, attachment and detachment are easy.
[0046]
(Modification)
In the above-described first to third embodiments, the rib walls 2, 3, and 4 serving as the displacement limiting limiters are, for example, partially (or several places) in the key arrangement direction with respect to the surfaces of the switch substrates 12, 23, and 33. Although they are in contact with each other, for example, a modified example shown in FIG. 5 may be used. This example shows a modification of the first embodiment, in which the lower surface of the lower case 11 is formed so as to protrude toward the inside of the musical instrument (toward the switch board 12) to form a displacement limiting limiter 2 '. The surface of the displacement regulating limiter 2 'facing the back surface of the switch substrate 12 is a curved surface 2a'.
[0047]
The curved surface 2a 'is configured to contact a wide surface (a surface extending in the key arrangement direction) with respect to the rear surface of the switch substrate 12. Accordingly, the same operation and effect as those of the first embodiment can be obtained, and the concave portion 11d is formed on the back side of the lower case 11, so that the concave portion 11d may be used as the battery accommodating portion. Note that a detachable battery lid 11e is attached to the recess 11d. As described above, the curved surface of the displacement restricting limiter can be made to be a wide surface in the second and third embodiments.
[0048]
(Fourth embodiment)
FIG. 7 is a right side view of a keyboard device for an electronic piano to which the substrate holding structure according to the fourth embodiment is applied. In this keyboard device, the entire key is supported by a keyboard frame 100, and the keyboard frame 100 is supported by a shelf board 101. The key 40 is composed of a white key and a black key. Each key is supported by the support portion 41 at a position slightly behind the center of the keyboard frame 100 so as to be rotatable up and down around a rotation center R40. Below the key 40, the mass body 50 is supported by the keyboard frame 100. The mass body 50 extends substantially horizontally in the front-rear direction as a whole, and pivots around the tip of the support piece 102 erected at a position near the front of the keyboard frame 100 as a pivot center R50.
[0049]
In order to hold the mass 50 by the support pieces 102, one end of the S-shaped spring 42 presses the concave portion 52 of the mass 50 opposite to the support piece 102. The concave portion 52 is formed by a rib having a constant width in the thickness direction of the mass body 50, and a thin plate portion extends vertically at a central portion in the width direction of the rib in the concave portion 52. The end of the S-shaped spring 42 that engages with the concave portion 52 is forked with a slit at the center, and the thin plate portion is inserted into and engaged with the slit. An intermediate portion of the S-shaped spring 42 presses against and contacts an edge of a spring through hole 103 substantially at the center in the front-rear direction on the upper part of the keyboard frame 100. The other end of the S-shaped spring 42 is The receiving portion 43 is configured to be pressed. As a result, the S-shaped spring 42 acts to press the mass body 50 against the tip of the support piece 102 at the position of the concave portion 52 and to push down a portion of the mass body 50 behind the rotation center R50.
[0050]
The front end of the mass body 50 is in contact with the lower end of the hanging piece 44 of the key 40, and when the key 40 is pressed, the mass body 50 rotates in conjunction with the key. A switch board 60 is supported by a keyboard frame 100 near the lower front end of the mass body 50, and a key switch 61 is fixed on the switch board 60. A switch driving unit 53 having a pair of legs extending downward at a position corresponding to the key switch 61 is provided on the front lower surface of the mass body 50. The switch driving unit 53, the switch board 60, and the key switch 61 constitute a key pressing switch for sensing a key pressing speed.
[0051]
The mass body 50 extends to the rear of the keyboard frame 100, and is supported near the rear end by a felt stopper member 104 fixed on the keyboard frame 100 at the rest position (non-key pressed state). When the key 40 is pressed, the mass body 50 moves from the rest position shown by the solid line in FIG. 7 to the key pressed position shown by the dashed line. Immediately behind the key 40 in the keyboard frame 100, a stopper member 105 is held, and serves to stop the mass body 50 that has reached the key-depression 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 via the protective sheet 105b. The cushioning felt 105a is usually formed by stacking felts having different hardnesses so as to provide a cushioning action against the collision of the mass body 50 abutting portion 54 and a secure stop feeling against the player's fingers. The mass body 50 is made of plastic from the front part to the vicinity of the center of rotation R50, and is formed so that the metal rod extends from the rear part thereof. Creates resistance.
[0052]
At the rear of the keyboard frame 100, a sensor device 70 is mounted. The sensor device 70 has a structure in which two tension members are supported on both sides of the keyboard as a whole. One of the two extending members 71 is for sensing, and is held between the buffering felt 105a of the stopper member 105 and the protection sheet 105b and extends in the frontage direction of the keyboard device. I have. The other extension member 72 is provided for compensation provided to prevent a reduction in sensitivity of the sensing extension member 71 due to a disturbance factor. The compensating tension member 72 extends parallel to 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]
On the outside of the left end of the keyboard row, an unillustrated extension supported by the keyboard frame 100 is provided. Each of the sensing extension member 71 and the compensation extension member 72 is provided by an extension leaf spring of the extension 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 a detection circuit board 81. The detection leaf spring 82 is in the form of a leaf spring, and its base end is fixed to the detection circuit board 81 with screws 88, 88, and a small groove is formed at the distal end to pull the end of the sensing tension member 71. So supportive. 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 distortion sensor 83 and an adjustment element 84 for fine adjustment thereof.
[0054]
In the sensor device 70, the following settings are further made. The tensioning leaf spring has a stronger spring force than the detecting leaf spring 82. The tension member 72 for compensation has a higher tensile rigidity than the tension member 71 for sensing. In other words, the compensating tension member 72 is fixedly supported at the right end by the keyboard frame 100, and is pulled at the left end by the tension leaf spring, and is in a predetermined extended state. On the other hand, the sensing extension member 71 is held at the left end position together with the compensation extension member 72 by a tensioning leaf spring as a joint holding portion. Further, the right end thereof is held at the free end of the detection leaf spring 82 so as to bend the detection leaf spring 82. Therefore, in order to stabilize the position of the left end in a state where the compensating tension member 72 is pulled, the spring force of the tensioning leaf spring is increased, and the compensating tension spring 82 is not greatly bent. The tensile rigidity of the tension member 72 is increased.
[0055]
Next, the operation of the keyboard device will be described. When the key is depressed from the state shown in FIG. 7, the key 40 rotates downward about the rotation center R40, 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 driving unit 53 comes into contact with the key switch 61 to turn on the key press switch, and the sound generation mechanism is operated to generate sound. During this time, the mass body 50 raises a portion behind the rotation center R50. Immediately after the switch driving section 53 contacts the key switch 61, the contact portion 54 at the rear end of the mass body 50 contacts 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 pressing force of the key is increased or decreased in the key pressed state, the abutting portion 54 at the rear end of the mass body 50 changes the amount of bending of the stopper member 105, particularly the cushioning felt 105a. The meandering amount of the extension member 71 also changes. When the meandering amount increases, the deflection of the detection leaf spring 82 increases, and the output of the distortion sensor 83 increases. By picking up this output change, it is possible to detect a change in the pressing force on the key after the key is pressed, and if the volume, sound quality, and the like are changed accordingly, aftertouch control can be performed. In addition, by appropriately selecting the flexibility of the buffering felt 105a and the protection sheet 105b of the stopper member 105, even if a plurality of keys are pressed, the bending of the stopper member 105 due to each key press is sensed. Accurate after touch control can be performed by reflecting the meandering of the tension member 71.
[0057]
In addition, this sensor device 70 is provided with a sensing tension member 71 in parallel with the compensation tension member 72, and applies the spring force of the tension leaf spring to the compensation tension member 72 and the sensing tension member 71. By acting, one end is supported, and the sensing tension member 71 itself receives the spring force of the detection leaf spring 82. Accordingly, even if disturbance factors such as a change in the length of the tension member and a rise in temperature due to an external force at the time of attachment act, the influence is absorbed by the compensation tension member 72 and the sensing tension member is absorbed. The spread to 71 is prevented.
[0058]
FIG. 6 is a view showing a main part of the fourth embodiment, and shows a positional relationship between the keyboard frame 100, the mounting structure near the stopper member 105, and the contact portion 54 of the mass body 50. The stopper member 105 is held by the keyboard frame 100, and the protection substrate 5 is attached to the back surface of the keyboard frame 100 on the side of the mass body 50.
[0059]
Here, for example, when a strong pressing force is applied to the keyboard, the contact portion 54 of the mass body 50 greatly deforms the cushioning felt 105a. The movement of the mass body 50 is regulated to some extent by being brought into contact with the portion 54. This protects the buffer felt 105a and the sensor device 70 (or the sensing tension member 71). That is, the protective substrate 5 is a substrate for preventing the destruction of the mass body stopper for preventing the damping felt 105a (mass body stopper such as felt) from being deteriorated. Substrate.
[0060]
Further, if the protection substrate 5 is hard and is hardly deformed, the mass body 50 itself is destroyed when a stronger pressing force is applied. Therefore, the protection 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 displacing to the keyboard frame 100 side.
[0061]
The keyboard frame 100 and the protection substrate 5 are separated from each other in the vicinity of the stopper member 105, and a rib wall 6 is provided upright at the separated portion. The end surface 6a of the rib wall 6 on the side of the protection substrate 5 is a curved surface that protrudes toward the protection substrate 5 from the contact end portion between the keyboard frame 100 and the protection substrate 5 to the stopper member 105 side. That is, when no load is applied to the protection substrate 5, the rib wall 6 is a curved surface in which the distance from the protection substrate 5 increases as the distance from the fixed portion of the protection substrate 5 to the keyboard frame 100 toward the end 5a increases. .
[0062]
Note that the above configuration is a detailed specific example of claim 1, wherein the keyboard frame 100 is a “frame”, the protection board 5 is a “board”, the end 5 a of the protection board 5 is a “stopper section”, and the mass Reference numeral 50 denotes an “operating member”, the rib wall 6 constitutes a “displacement limiter”, and the end surface 6a of the rib wall 6 constitutes a “curved surface of the displacement limiter”.
[0063]
When the operation of the mass body 50 becomes stronger, the protection substrate 5 is displaced by the pressing force applied from the contact portion 54 to the end 5 a of the protection substrate 5, but the amount of displacement is restricted to a predetermined amount or less by the rib wall 6. You. Further, as in the above embodiments, the protective substrate 5 is displaced following the end surface 6a of the rib wall 6, so that the action of deforming the protective substrate 5 is distributed to each local portion of the protective substrate 5, and 5 can be prevented from being broken or broken. Also, no mechanical noise is generated. Further, the stress applied to the mass body 50 due to the displacement of the protection substrate 5 can be reduced, and the mass body 50 can be protected.
[0064]
Although the embodiments have been described above, the curved surfaces of the end surfaces 2a, 3a, 4a, 6a of the rib walls 2, 3, 4, 6 in each embodiment may be arc-shaped. For example, when the first embodiment is 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 destroyed) in all parts is that the outer edge bending stress (tension acting parallel to the surface on the convex side of the bending shape) of the switch substrate 12 is constant throughout the front-back direction of the substrate at the maximum allowable value. Value. Therefore, the degree of deformation of the switch substrate 12 may be constant over the entire region in the front-rear direction of the substrate, that is, the switch substrate 12 may have a constant radius of curvature. The radius of curvature can be obtained from the allowable maximum value of the Young's modulus, thickness, and outer edge bending stress of the substrate. Thereby, the stress applied to the switch substrate 12 is evenly distributed.
[0065]
In addition, the thickness of the substrate changes as it advances in the longitudinal direction of the substrate (the direction from the fixed portion toward the point of application of the pressing force), and the width in the direction perpendicular to the longitudinal direction changes as it advances in this longitudinal direction. In this case, the allowable maximum value of the outer edge bending stress at a local portion in the longitudinal direction of the substrate differs with respect to the bending force of the substrate. In such a case, the shape of the curved surface may be determined according to the shape of the substrate.
[0066]
Further, in each embodiment, the curved surface of the displacement regulating limiter is a continuous surface in the longitudinal direction of the substrate, but 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 be applied to other electronic devices. For example, in a game machine, the present invention can be applied to protect a switch board for detecting an operation of an operator from a severe operation of the operator.
[0068]
【The invention's effect】
According to the substrate holding structure of the electronic device of the first aspect, 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 portion of the substrate in a process in which the displacement proceeds. Since the substrate is dispersed, the entire substrate can be prevented from being cracked or broken. Further, since each part of the substrate only comes into contact with the displacement restriction limiter sequentially following the part already in contact with the displacement restriction limiter, no mechanical noise is generated. Further, since the substrate is displaced (bent) in response to the applied stress, the stress directly applied to the switch or the sensor can be reduced, and the switch or the sensor can be protected. Furthermore, since the substrate can be fixed by at least one fixing portion at the front and rear positions, attachment and detachment are easy.
[Brief description of the drawings]
FIG. 1 is a 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 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 illustrating a specific example of an electronic musical instrument according to a second embodiment of the present invention.
FIG. 4 is a 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 a keyboard device for an electronic piano to which a substrate holding structure according to a fourth embodiment of the present invention is applied.
FIG. 8 is a diagram illustrating an example of a mounting structure of a switch board in a conventional electronic keyboard instrument.
[Explanation of symbols]
2 ... rib wall (displacement limiting limiter), 2a ... end face (curved surface of the displacement limiting limiter), 11 ... lower case (frame), 12 ... switch board (board), 12a ... key stopper (stopper part), 13, 14 ... Key (operating member), 3 ... rib wall (displacement limiting limiter), 3a ... end face (curved surface of displacement limiting limiter), 22 ... back case (frame), 23 ... switch board (board), 24 ... A operator (operation) 25) B operator (operating member), 26 ... operation switch (stopper), 27 ... pressure-sensitive sensor (stopper), 31, 32 ... case (frame), 33 ... switch board (board), 34 ... Slide operating element (operating member), 35a, 35b ... Sensor (stopper part), 4 ... Rib wall (displacement restricting limiter), 4a ... End face (curved surface of displacement restricting limiter), 2 '... Displacement restricting limiter, 2a … Curved surface of displacement limiting limiter, 100… keyboard frame (frame), 50… mass body (operating member), 5… protective board (substrate), 5a… end part (stopper part), 6… rib wall (displacement limiting limiter) , 6a ... end face (curved surface of displacement limiter)

Claims (1)

Frame and
A substrate partially fixed to the frame,
A stopper portion located at a position separated 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:
A displacement restriction limiter that restricts the displacement of the substrate by a pressing force received by the stopper portion when the operation of the operation member is restricted by the stopper portion to a predetermined amount or less;
The substrate holding structure for an electronic device, wherein the displacement regulating limiter has a curved surface whose distance from the substrate increases in a direction away from the portion of the substrate toward the stopper when no load is applied to the substrate.

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