EP2372694A2 - Appareil à pédale pour instrument électronique à clavier - Google Patents

Appareil à pédale pour instrument électronique à clavier Download PDF

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Publication number
EP2372694A2
EP2372694A2 EP11153681A EP11153681A EP2372694A2 EP 2372694 A2 EP2372694 A2 EP 2372694A2 EP 11153681 A EP11153681 A EP 11153681A EP 11153681 A EP11153681 A EP 11153681A EP 2372694 A2 EP2372694 A2 EP 2372694A2
Authority
EP
European Patent Office
Prior art keywords
pedal
reaction force
force application
depression
application device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11153681A
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German (de)
English (en)
Other versions
EP2372694A3 (fr
EP2372694B1 (fr
Inventor
Yoshihiko Arayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roland Corp
Original Assignee
Roland Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2010046624A external-priority patent/JP5653051B2/ja
Application filed by Roland Corp filed Critical Roland Corp
Publication of EP2372694A2 publication Critical patent/EP2372694A2/fr
Publication of EP2372694A3 publication Critical patent/EP2372694A3/fr
Application granted granted Critical
Publication of EP2372694B1 publication Critical patent/EP2372694B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details
    • G10H1/34—Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments
    • G10H1/344—Structural association with individual keys
    • G10H1/348—Switches actuated by parts of the body other than fingers

Definitions

  • the present invention relates to a pedal device for an electronic keyboard instrument.
  • Japanese Laid-open Patent Application, Publication No. JP2004-334008 describes a pedal device that is equipped with a first pedal lever that is operated through depression by the performer, a second pedal lever that moves together with the first pedal lever when the first pedal lever is depressed by an amount greater than the reference amount, and a first spring and a second spring that give reaction forces countering the depression operation of the first pedal lever to the first pedal lever and the second pedal level, respectively.
  • the operation load to the first pedal lever is changed in a stepwise fashion according to the depression amount by the first spring and the second spring, whereby a feeling of operation similar to that given by the damper pedal of an acoustic piano can be realized.
  • a pedal device used by a performer of an electronic keyboard apparatus includes a pedal that is moved in response to a depression operation from the performer; a chassis that rotationally supports the pedal according to the depression operation to move the pedal downwardly about a supporting position supported by the chassis; a first reaction force application device that applies a first reaction force countering the depression operation of the pedal to the pedal; and a second reaction force application device that is pre-compressed in a state in which the amount of depression of the pedal does not reach a specified amount, and is compressed in association with the depression operation of the pedal when the amount of depression of the pedal exceeds the specified amount, wherein the second reaction force application device applies a second reaction force with an elastic force countering the depression operation to the pedal.
  • the first reaction force application device is located between the supporting position of the pedal and the operation position, and wherein the first reaction force is applied to the pedal at a position between the supporting position and the operation position.
  • the second reaction force application device is located between a position of the first reaction force application device and the operation position, and wherein the second reaction force application device applies the second reaction force to the pedal at a position between a position of the first reaction force application device and the operation position.
  • FIG. 1 illustrates an exploded perspective view of a pedal device of an electronic keyboard apparatus in accordance with an embodiment of the invention.
  • FIG. 2 illustrates a cross-sectional view of the pedal device of an electronic keyboard apparatus taken along a line II ⁇ II of FIG. 1 .
  • FIG. 3 illustrates a cross-sectional view of the pedal device of an electronic keyboard apparatus taken along a line III ⁇ III of FIG. 1 .
  • FIG. 4a illustrates a bottom side perspective view of a first pedal.
  • FIG. 4b illustrates a bottom side perspective view of a third pedal.
  • FIGs. 5a and 5b show cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line II ⁇ II of FIG. 1 , wherein FIG. 5a shows an initial state of the first pedal, and FIG. 5b shows a depressed state of the first pedal.
  • FIGs. 6a, 6b, 6c illustrate cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line III ⁇ III of FIG. 1 , wherein FIG. 6a illustrates an initial state of the third pedal, FIG. 6b illustrates a specified state of the third pedal, and FIG. 6c illustrates a depressed state of the third pedal.
  • FIG. 7 illustrates a graph showing the relation between the amounts of depression of the first pedal, the second pedal and the third pedal, and their operation loads and voltage values outputted to the electronic keyboard apparatus.
  • FIG. 8 illustrates a cross-sectional view of a pedal device of an electronic keyboard apparatus in accordance with a second embodiment.
  • FIG. 9 illustrates a cross-sectional view of a pedal device of an electronic keyboard apparatus in accordance with a third embodiment.
  • the described embodiments provide a pedal device of an electronic keyboard apparatus, capable of reducing the size thereof, while realizing a feeling of operation similar to that of the damper pedal of an acoustic piano.
  • a pedal device of an electronic keyboard apparatus is equipped with a first reaction force application device that gives a first reaction force countering a depression operation to the pedal, and a second reaction force application device that is compressed in association with the depression operation of the pedal when the amount of depression exceeds a specified amount, and applies a second reaction force with an elastic force countering the depression operation to the pedal, such that the operation load of the pedal can be changed in a stepwise fashion according to the amount of depression. Therefore, it is possible to realize a feeling of operation similar to that given by the damper pedal of an acoustic piano.
  • the first reaction force application device is provided between a supporting position of the pedal supported by a chassis and an operation position of the pedal that is operated through depression by the performer.
  • the first reaction force application device applies the first reaction force to the pedal at a location between the supporting position and the operation position.
  • the second reaction force application device is provided between a position of the first reaction force application device and the operation position of the pedal. Further, the second reaction force application device applies the second reaction force to the pedal at a location between the arranged position of the first reaction force application device and the operation position. This is effective in making the second reaction force application device smaller in size and making the pedal device smaller in size.
  • the elastic force of the second reaction force application device that is necessary for applying the second reaction force to the pedal may become smaller, based on the principle of leverage, when the second reaction force application device is located farther from the supporting position of the pedal and closer to the operation position, and may become greater as it is located farther from the operation position of the pedal and closer to the supporting position. For this reason, if the second reaction force is applied to the pedal at a position between the arranged position of the first reaction force application device and the supporting position, then the second reaction force application device needs a greater elastic force, which, as a result, causes the second reaction force application device to become larger in size. In other words, when the second reaction force application device is to be formed from a coil spring, its coil wire needs to be thicker or the coil outer diameter needs to be larger.
  • the second reaction force application device has a position set farther from the supporting position of the pedal and closer to the operation position, which allows the elastic force required for the second reaction force application device to be made smaller.
  • the second reaction force application device can be made smaller in size, and the pedal device can be made smaller.
  • the accuracy in the pedal operation load can be improved.
  • the second reaction force application device becomes larger in size, and the accuracy in its elastic force is lowered.
  • the second reaction force application device is formed from a coil spring, and its coil wire is made thicker or the outer coil diameter is made larger, its load accuracy also lowers. As a result, differences would likely occur in the pedal operation load accuracy from one device manufactured to another.
  • the second reaction force application device can be made smaller in size, and lowering of the accuracy in its elastic force can be suppressed.
  • the pedal operation load accuracy for each of the pedal devices manufactured can be improved.
  • the pedal device may be equipped with a restriction device that is provided at a position between the arranged position of the first reaction force application device and the operation position of the pedal and restricts a lower limit position of the pedal by restricting rotational movement of the pedal.
  • the second reaction force application device is disposed opposite to the restriction device, and compressed in association with the depression operation of the pedal upon abutting against the restriction device when the amount of depression of the pedal exceeds a specified amount, which is effective in that the amount of depression (the specified amount) of the pedal until the second reaction force is applied to the pedal can be accurately set.
  • the amount of depression (the specified amount) of the pedal until the second reaction force is applied to the pedal is desired to have a high accuracy when the performer performs while placing his foot on the pedal, or for a depression operation called half-pedaling.
  • a backlash is difficult to be influenced by the dimensional accuracy of the second reaction force application device (the dimensional accuracy in the direction in which the pedal is depressed) when the second reaction force application device is provided at a position between the arranged position of the first reaction force application device and the operation position, and the accuracy is higher.
  • the backlash would readily be influenced by the dimensional accuracy of the second reaction force application device when the second reaction force application device is provided at a position between the arranged position of the first reaction force application device and the supporting position, and the accuracy would become lower. For this reason, if the second reaction force application device is provided at a position between the arranged position of the first reaction force application device and the supporting position, differences in the backlash would likely occur in individual devices manufactured.
  • the backlash can be made more difficult to be influenced by the dimensional accuracy of the second reaction force application device, whereby differences in the backlash can be suppressed.
  • backlash can be accurately set for each of the individual apparatuses manufactured.
  • the pedal device may be equipped with an actuator that is removably attached to the pedal and has a stopper section disposed opposite to the restriction device in a state of the actuator being attached to the pedal.
  • the second reaction force application device is fitted inside the stopper section. Therefore, the stopper section can be used as a storage space for the second reaction force application device, which is effective in making the device smaller in size.
  • the second reaction force application device is attached to the pedal in one piece with the actuator, such that the second reaction force application device, together with the actuator, can be attached to the pedal. This is effective in improving the workability. Furthermore, even if the pedal is not equipped with the second reaction force application device, the second reaction force application device can be provided thereon by replacing the actuator, and feeling of operation similar to that provided by the damper pedal of an acoustic piano can be realized.
  • the pedal device may be equipped with a sensor that detects the amount of depression of the pedal based on the amount of rotational movement of the pedal, and is structured to output an electrical signal to the electronic keyboard apparatus according to a detection result of the sensor, wherein the actuator is equipped with a transmission section that transfers the amount of rotational movement of the pedal to the sensor. Therefore, by suitably changing the shape of the transmission section, the relation between the amount of depression of the pedal and the electrical signal to be outputted to the electronic keyboard apparatus can be arbitrarily set. Accordingly, it is effective in that the electrical signal to be outputted to the electronic keyboard apparatus can be readily interlocked with changes in the operation load of the pedal.
  • the pedal device may be equipped with a plurality of pedals, and is equipped with the second reaction force application device for at least one of the plurality of pedals.
  • a pedal whose operation load changes in a stepwise fashion according to the amount of depression and a pedal whose operational load is constant regardless of the amount of depression of the pedal can be co-existed, such that a single device can be provided with the pedals having feelings of operation different from one another.
  • the described embodiments relate to a pedal device for an electronic keyboard instrument and, in particular to a pedal device of an electronic keyboard instrument that is capable of reducing the size thereof, while realizing a feeling of operation similar to that of the damper pedal of an acoustic piano.
  • FIG. 1 is an exploded perspective view of a pedal device 1 of an electronic keyboard apparatus in accordance with an embodiment of the invention. It is noted that arrows U-D, L-R and F-B in FIG. 1 indicate an up-down direction, a left-right direction and a front-back direction of the pedal device 1 of the electronic keyboard apparatus, respectively.
  • the pedal device 1 is used for an electronic keyboard apparatus, such as, an electronic piano or the like (not shown), and is a device for adding various types of sound effects to musical notes generated by the electronic keyboard apparatus.
  • the pedal device 1 is mainly equipped with a chassis 10 composing a main body, and a first pedal 20, a second pedal 30 and a third pedal 40 arranged side by side in the left-right direction of the chassis 10.
  • the pedal device 1 outputs a voltage value corresponding to the amount of depression to the electronic keyboard apparatus, and is structured to give sound effects similar to those created by a soft pedal, a sostenuto pedal and a damper pedal of an acoustic piano to musical notes of the electronic keyboard apparatus.
  • the chassis 10 is composed of an upper chassis 10a (also referred to herein as a part of the chassis) and a lower chassis 10b (also referred to herein as a part of the chassis) formed from resin material such as ABS resin.
  • the upper chassis 10a and the lower chassis 10b are parts of the chassis superposed and assembled together into a hollow box shape having an internal space S for mounting a first spring 50, a sensor 60 and a circuit board 70 therein.
  • a connection cable 71 extends from the circuit board 70 for connecting the pedal device 1 to the electronic keyboard apparatus.
  • the first pedal 20, the second pedal 30 and the third pedal 40 correspond to a soft pedal, a sostenuto pedal and a damper pedal of an acoustic piano, respectively, and are each formed from metal material such as brass, iron steel and the like into an elongated plate shape.
  • the pedals 20, 30 and 40 have rear end sections supported by the chassis 10, and front end sections that are exposed on the front side of the chassis 10. Each of the pedals 20, 30 and 40 may be depressed at the front end section side by the performer, thereby being rotationally moved downwardly about the supporting position as a pivot supported by the chassis 10.
  • a first spring 50 applies a reaction force countering a depression operation to each of the pedals 20, 30 and 40, and may be composed of a coil-shaped compression spring. Also, the first spring 50 is arranged at each of the pedals 20, 30 and 40, and is retained between the chassis 10 and each of the pedals 20, 30 and 40 in a pre-compressed (pre-pressurized) state. The first spring 50 is compressed in association with depression operation of each of the pedals 20, 30 and 40, and applies a reaction force countering the depression operation (hereafter referred to as a "first reaction force") by its elastic force to each of the pedals 20, 30 and 40.
  • a reaction force countering the depression operation hereafter referred to as a "first reaction force
  • the sensor 60 detects the amount of depression on each of the pedals 20, 30 and 40, and outputs a resistance value corresponding to the amount of depression, and is structured with a lever section 61 that rotational moves in association with depression operation of each of the pedals 20, 30 and 40, and a variable resistor (not shown) that outputs a resistance value corresponding to the amount of rotational movement of the lever section 61, in other words, the amount of depression of each of the pedals 20, 30 and 40. Also, the sensor 60 is mounted on the circuit board 70, and is arranged at each of three positions corresponding to the arranged positions of the pedals 20, 30 and 40.
  • the sensor 60 outputs a resistance value corresponding to each of the amounts of depression of the respective pedals 20, 30 and 40, and a voltage value corresponding to the resistance value is outputted to the electronic keyboard apparatus through the connection cable 71.
  • sound effect corresponding to the amount of depression of each of the pedals 20, 30 and 40 is applied to musical notes of the electronic keyboard apparatus.
  • FIG. 2 is a cross-sectional view of the pedal device 1 taken along a line II ⁇ II of FIG. 1
  • FIG. 3 is a cross-sectional view of the pedal device 1 taken along a line III ⁇ III of FIG. 1
  • FIG. 4 (a) is a bottom side perspective view of the first pedal 20
  • FIG. 4 (b) is a bottom side perspective view of the third pedal 40.
  • arrows U-D, L-R and F-B in FIG. 2 and FIG. 3 indicate an up-down direction, a left-right direction and a front-back direction of the pedal device 1, respectively.
  • supporting sections 11 are provided on the rear side of the internal space S of the chassis 10 at three locations corresponding to the arranged positions of the first pedal 20, the second pedal 30 and the third pedal 40, respectively.
  • the supporting section 11 is a portion for supporting each of the pedals 20, 30 and 40, and is composed of a convex upper supporting section 11a formed on the upper chassis 10a, and a lower supporting section 11b formed on the lower chassis 10b.
  • Each of the pedals 20, 30 and 40 is held at their rear end sections between the upper supporting section 11a and the lower supporting section 11 b, such that the pedals are rotatably supported on the chassis 10 in a cantilever fashion.
  • Opening sections 12 are provided in the front face of the chassis 10 at three locations corresponding to the arranged positions of the first pedal 20, the second pedal 30 and the third pedal 40, respectively.
  • the opening sections 12 are portions for exposing the front end sections of the pedals 20, 30 and 40 on the front side of the chassis 10, and are each composed of an upper mouth section 12a formed in an opening in the upper chassis 10a in a generally rectangular shape as viewed in a front view, and a lower mouth section 12b formed in an opening in the lower chassis 10b in a generally rectangular shape as viewed in a front view.
  • cushions 13 and 14 are attached to an upper face and a lower face of the opening section 12.
  • the cushions 13 and 14 form restriction devices that restrict rotational movements of each of the pedals 20, 30 and 40, and is composed of a shock absorbing material, such as, felt, urethane foam or the like.
  • a shock absorbing material such as, felt, urethane foam or the like.
  • Each of the pedals 20, 30 and 40 is prevented, upon abutting against the cushion 13 or 14, from further rotational movement, whereby its upper limit position and the lower limit position are set. Also, when each of the pedals 20, 30 and 40 abuts against the cushions 13 and 14, the impact is damped by the cushions 13 and 14. By this, thudding sounds can be suppressed.
  • Groove sections 20a, 30a and 40a are provided at the rear end sections of the first pedal 20, the second pedal 30 and the third pedal 40 along the width direction (in the arrowed direction L-R), respectively.
  • the groove sections 20a, 30a and 40a are portions that are supported by the supporting portions 11 of the chassis 10, and are each formed as a recess having a generally U-shaped cross section.
  • the pedals 20, 30 and 40 rotationally move about the groove sections 20a, 30a and 40 as fulcrums, respectively.
  • actuators 21, 31 and 41 are detachably attached to the lower surfaces of the pedals 20, 30 and 40 by screws 15, respectively.
  • the actuators 21, 31 and 41 are provided to transfer the amounts of depression of the respective pedals 20, 30 and 40 to the sensor 60 and regulate the amounts of depression, and are each formed from resin material such as POM resin in an elongated plate shape.
  • the structure of the actuators 21, 31 and 41 is described in detail. It is noted that the actuator 31 has the same structure as that of the actuator 21, and therefore description of the detailed structure of the actuator 31 is omitted.
  • a retaining section 21a, a transmission section 21b and a stopper section 21c are provided on the bottom face of the actuator 21.
  • the retaining section 21a is a portion for retaining the first spring 50, and is provided in a manner to protrude generally in a central section of the actuator 21.
  • a first reaction force by the first spring 50 is applied to the first pedal 20 generally at the central section of the actuator 21 where the retaining section 21a is provided.
  • the transmission section 21b is a portion for transferring the amount of depression of the first pedal 20 to the sensor 60, and is provided in a manner to protrude at a position opposite to the level section 61 of the sensor 60.
  • the transmission section 21b pushes the lever section 61 of the sensor 60 in association with depression operation of the first pedal 20, thereby transferring the amount of depression of the first pedal 20 to the sensor 60.
  • a voltage value corresponding to the amount of depression of the first pedal 20 is outputted to the electronic keyboard apparatus.
  • the stopper section 21c is a portion for regulating the amount of depression of the first pedal 20, and is provided in a manner to protrude in the front end section of the actuator 21 at a position opposite to the cushion 14.
  • the stopper section 21c abuts against the cushion 14, downward rotational movement of the first pedal 20 is restricted, and its lower limit position is restricted. By this, the amount of depression of the first pedal 20 is regulated.
  • a retaining section 4 1 a, a transmission section 41 b and a stopper section 41c are provided on the bottom face of the actuator 41.
  • the retaining section 41a is a portion for retaining the first spring 50, and is provided generally in a central section of the actuator 41.
  • a first reaction force by the first spring 50 is applied to the third pedal 40 generally at the central section of the actuator 41 where the retaining section 41a is provided.
  • the retaining section 41a in accordance with the present embodiment also plays a role of a mounting section for mounting the screw 15. By this, an independent mounting section is not required, and thus the number of components can be reduced, whereby the product cost can be reduced.
  • the transmission section 41b is a portion for transferring the amount of depression of the third pedal 40 to the sensor 60, and is provided in a manner to protrude at a position opposite to the level section 61 of the sensor 60.
  • the transmission section 41b pushes the lever section 61 of the sensor 60 in association with depression operation of the third pedal 40, thereby transferring the amount of depression of the third pedal 40 to the sensor 60.
  • a voltage value corresponding to the amount of depression of the third pedal 40 is outputted to the electronic keyboard apparatus. Accordingly, the relation between the amount of depression of the third pedal 40 and the voltage value outputted to the electronic keyboard apparatus is determined by the shape of the transmission section 41b.
  • the relation between the amount of depression of the third pedal 40 and the voltage value to be outputted to the electronic keyboard apparatus can be arbitrarily set.
  • the voltage value to be outputted to the electronic keyboard apparatus can be readily interlocked with changes in the operation load of the third pedal 40.
  • the transmission section 41 b in accordance with the present embodiment is formed as a sloped surface that tilts downwardly toward the rear end section side of the third pedal 40.
  • the stopper section 41c is a portion for regulating the amount of depression of the third pedal 40, and is provided in a manner to protrude in the front end section of the actuator 41 at a position opposite to the cushion 14.
  • the stopper section 41c abuts against the cushion 14, downward rotational movement of the third pedal 40 is restricted, and its lower limit position is restricted. By this, the amount of depression of the third pedal 40 is regulated.
  • the stopper section 41c is formed in a hollowed out configuration that has an internal space P for mounting a second reaction force application mechanism 42 (or second reaction force application device) therein, and opens in a central section of the bottom face.
  • the second reaction force application mechanism 42 is provided to change the operation load of the third pedal 40 during the course of pedal-depression, and is composed of a second spring 43 and a movable stopper 44, which is a part of the second reaction force application device 42.
  • the second reaction force application mechanism 42 is mounted inside the internal space P of the stopper section 41c, and therefore is attached together with the actuator 41 to the third pedal 40.
  • the second spring 43 applies a reaction force countering depression operation to the third pedal 40, and may be composed of a coil-shaped compression spring. Also, the second spring 43 is retained between the third pedal 40 and the moveable stopper 44 in a pre-compressed (pre-pressurized) state.
  • the third pedal 40 is operated and depressed to the extent exceeding a specified amount of depression of the third pedal 40 (hereafter referred to as a "specified amount")
  • the second spring 43 is compressed in association with depression operation of the third pedal 40, and applies a reaction force countering the depression operation (hereafter referred to as a "second reaction force") by its elastic force to the third pedal 40.
  • the second reaction force is applied by the second spring 43 to the third pedal 40 in the front end section of the actuator 41 where the stopper section 41c is disposed.
  • the moveable stopper 44 retains the second spring 43, and is formed from a resin material such as ABS resin in a hollowed out configuration whose top face is opened.
  • the moveable stopper 44 is normally urged by the second spring 43, thereby protruding from the bottom face of the stopper section 41c.
  • the moveable stopper 44 abuts against the cushion 14, and when the third pedal 40 is further operated and depressed to the extent exceeding the specified amount, the moveable stopper 44 enters the internal space P of the stopper section 41c while compressing the second spring 43.
  • the second spring 43 is stored in the moveable stopper 44.
  • the second reaction force application mechanism 42 can be made smaller in size, and the pedal device 1 can be made smaller in size.
  • a flange section 44a is provided at an upper edge section of the moveable stopper 44.
  • the flange section 44a is a portion for controlling the lower limit position of the moveable stopper 44, and is formed in a manner to protrude in the front-rear and left-right directions.
  • a cushion 45 composed of a shock absorbing material such as felt, urethane form or the like is attached to the lower surface of the flange section 44a.
  • a guide section 41c1 is provided in the internal space P of the stopper section 41c.
  • the guide section 41c1 is a portion for guiding entry of the moveable stopper 44, and is provided in a manner to extend in the direction of entry thereof.
  • the moveable stopper 44 enters the internal space P of the stopper section 41c along the guide section 41c1, whereby its entry is guided. By this, rattling of the moveable stopper 44 can be prevented, and the second spring 43 can be accurately compressed.
  • a cover section 41 c2 is provided at the front end section of the stopper section 41 c.
  • the cover section 41 c2 is a portion for covering the front side of the moveable stopper 44, and is provided in a manner to protrude downwardly.
  • the moveable stopper 44 is covered by the cover section 41c2, such that the exterior appearance can be improved, and the moveable stopper 44 can be protected from external factors such as penetration of dusts, insertion of the fingers or the like.
  • the second reaction force application mechanism 42 is fitted in the stopper section 41 c, and attached to the third pedal 40 in one piece with the actuator 41, such that the second reaction force application mechanism 42 can be effectively arranged, and the pedal device 1 can be made smaller in size. Also, as the second reaction force application mechanism 42 is attached to the third pedal 40 in one piece with the actuator 41, the second reaction force application mechanism 42 together with the actuator 41 can be attached to the third pedal 40, such that the work efficiency can be improved.
  • the second reaction force application mechanism 42 may be provided by replacing the actuator 41, whereby a feeling of operation similar to that created by the damper pedal of an acoustic piano can be realized.
  • FIGs. 5a and 5b are cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line II ⁇ II of FIG. 1 , wherein FIG. 5a shows an initial state of the first pedal and FIG. 5b shows a depressed state of the first pedal.
  • FIGs. 6a, 6b, 6c are cross-sectional views of the pedal device of an electronic keyboard apparatus taken along a line III ⁇ III of FIG. 1 , wherein FIG. 6a shows an initial state of the third pedal, FIG.
  • FIG. 6b shown a specified state of the third pedal
  • FIG. 6c shows a depressed state of the third pedal. It is noted that, in FIGs. 5a, 5b , 6a, 6b, and 6c , only those of the components necessary for describing the actions that take place when each of the pedals is depression-operated are appended with reference numerals, and the other components are illustrated without reference numerals.
  • the first pedal 20 When the first pedal 20 is depression-operated from the initial state shown in FIG. 5a (in the state in which the first pedal 20 is at the upper limit position), the first pedal 20 rotationally moves downwardly about the groove section 20a as a fulcrum supported by the supporting section 11 of the chassis 10.
  • the lever section 61 of the sensor 60 As the lever section 61 of the sensor 60 is pushed by the transmission section 21b of the actuator 21, the amount of depression of the first pedal 20 is detected by the sensor 60.
  • a voltage value corresponding to the amount of depression of the first pedal 20 is outputted to the electronic keyboard apparatus, whereby a sound effect similar to that of the soft pedal of an acoustic piano is given to musical sounds of the electronic keyboard apparatus.
  • the first reaction force countering the depression operation is applied by the first spring 50 to the first pedal 20.
  • a voltage value corresponding to the amount of depression of the third pedal 40 is outputted to the electronic keyboard apparatus, whereby a sound effect similar to that of the damper pedal of an acoustic piano is given to musical sounds of the electronic keyboard apparatus. Also, in this case, the first reaction force countering the depression operation is applied by the first spring 50 to the third pedal 40.
  • FIG. 7 is a graph showing the relation between the amounts of depression of the first pedal 20, the second pedal 30 and the third pedal 40, and their operation loads and voltage values outputted to the electronic keyboard apparatus.
  • a solid line F1, 2 in FIG. 7 indicates the relation between the amounts of depression of the first pedal 20 and the second pedal 30 and their operation loads
  • a solid line F3 indicates the relation between the amount of depression of the third pedal 40 and its operation load
  • a broken line V indicates the relation between the amount of depression of each of the pedals 20, 30 and 40 and the voltage value outputted to the electronic keyboard apparatus.
  • the relation between the amounts of depression of the first pedal 20, the second pedal 30 and the third pedal 40 and their operation loads is described. Only the first reaction force by the first spring 50 is applied to the first pedal 20 and the second pedal 30 from the initial state to the depressed state. Therefore, the operation load of each of the pedals 20 and 30 linearly increases with the amount of depression, as indicated by the solid line F1, 2. It is noted that the first spring 50 is pre-compressed (pre-pressurized), such that a reaction force according to the compression amount is applied to each of the pedals 20 and 30 at the start of the depression operation.
  • the operation load of the third pedal 40 changes during the course of depression, as indicated by the solid line F3. More specifically, the operation load of the third pedal 40 linearly increases with the amount of depression from the initial state to the specified state (in the range indicated as the period A) because only the first reaction force by the first spring 50 is applied.
  • the first spring 50 is pre-compressed (pre-pressurized), such that a reaction force according to the compression amount is applied to the third pedal 40 at the start of the depression operation. Then, upon reaching the specified state, the second reaction force by the second spring 43 in addition to the first reaction force by the first spring 50 are applied to the third pedal 40, such that the operation load of the third pedal 40 linearly changes according to the amount of depression at a greater change rate than that during the period from the initial state to the specified state. In this case, as the second spring 43 is pre-compressed (pre-pressurized), a reaction force according to the compressed amount is applied to the third pedal 40 when it reaches the specified state.
  • the pedal device 1 is provided with the third pedal 40 whose operation load changes in a stepwise fashion according to the amount of depression together with the first pedal 20 and the second pedal 30 whose operation load is constant regardless of the amount of depression, whereby differences are given to the pedal operation feelings.
  • the voltage value to be outputted to the electronic keyboard apparatus linearly increases with the amount of depression, when the amount of depression exceeds a predetermined amount of depression of each of the pedals 20, 30 and 40, as indicated by the broken line V.
  • the pedal device 1 in accordance with the present embodiment is equipped with the first spring 50 that applies the first reaction force countering the depression operation to the third pedal 40, and the second reaction force application mechanism 42 that applies the second reaction force countering the depression operation to the third pedal 40 when the amount of depression of the third pedal 40 exceeds the specified amount, such that the operation load of the third pedal 40 can be changed in a stepwise fashion according to the amount of depression. Accordingly, a feeling of operation similar to that of the damper pedal of an acoustic piano can be realized.
  • the first spring 50 is provided between the supporting position of the third pedal 40 supported by the chassis 10 and the operation position of the third pedal 40 that is operated through depression by the performer, and applies the first reaction force to the third pedal 40 at a position between the supporting position and the operation position.
  • the second reaction force application mechanism 42 is provided between the first spring 50 and the operation position, and applies the second reaction force to the third pedal 40 at a location between the first spring 50 and the operation position of the third pedal 40. Therefore the position of the second reaction force application mechanism 42 is set farther from the supporting position of the third pedal 40 and closer to the operation position, such that the elastic force necessary for the second reaction force application mechanism 42 can be made smaller. By this, the second reaction force application mechanism 42 can be made smaller in size and the pedal device 1 can be made smaller in size.
  • the second reaction force application mechanism 42 can be made smaller in size, and lowering of the accuracy in the elastic force can be suppressed. By this, the operation load accuracy of the third pedal 40 can be improved.
  • the second reaction force application mechanism 42 is disposed opposite to the cushion 14 that is provided between the first spring 50 and the operation position of the third pedal 40. Upon abutting against the cushion 14 when the depression amount of the third pedal 40 exceeds a specified amount, the second reaction force application mechanism 42 is compressed in association with the depression operation of the third pedal 40.
  • the backlash can be accurately set for individual pedal devices 1 manufactured.
  • FIG. 8 is a cross-sectional view of the pedal device 201 of an electronic keyboard apparatus in accordance with the second embodiment. It is noted that arrows U-D, L-R and F-B in FIG. 8 indicate an up-down direction, a left-right direction and a front-back direction of the pedal device 201 of the electronic keyboard apparatus, respectively.
  • the second reaction force application mechanism 42 is fitted in the stopper section 41c of the actuator 41.
  • a second reaction force application mechanism 242 (or second reaction force application device) is fitted in a chassis 210. It is noted that the same components as those of the first embodiment are appended with the same reference numbers, and their description is omitted.
  • the pedal device 201 in accordance with the second embodiment has a main body that is formed from a chassis 210.
  • a fitting section 216 is provided below an opening section 12 of the chassis 210.
  • the fitting section 216 is formed in a hollowed out configuration that has an internal space R for fitting a second reaction force application mechanism 242, and an upper face being open at its central section.
  • the second reaction force application mechanism 242 is to change the operation load of the third pedal 40 during the course of depression, and is composed of a second spring 43 and a moveable stopper 44.
  • the second reaction force application mechanism 242 is fitted in the internal space R of the fitting section 216, and retained by a plate 217 that is attached to the lower face of the chassis 210.
  • the second spring 43 is retained between the plate 217 and the moveable stopper 44 in a pre-compressed (pre-pressurized) state.
  • the moveable stopper 44 is normally urged by the second spring 43, thereby protruding from the upper face of the fitting section 216.
  • the third pedal 40 is depression-operated to the extent exceeding a specified amount, the moveable stopper 44 enters the internal space R of the fitting section 216 while compressing the second spring 43.
  • An actuator 241 is attached to the bottom surface of the third pedal 40.
  • the actuator 241 has a stopper section 241c whose shape is different from that of the actuator 41 of the first embodiment, and the internal space P is omitted.
  • a cushion 14 is attached to the bottom face of the stopper section 241c.
  • the third pedal 40 abuts against the fitting section 216 of the chassis 210 through the cushion 14, whereby its downward rotational movement is restricted, and its lower limit position is restricted. By this, the amount of depression of the third pedal 40 is regulated.
  • FIG. 9 is a cross-sectional view of the pedal device 301 of an electronic keyboard apparatus in accordance with the third embodiment. It is noted that arrows U-D, L-R and F-B in FIG. 9 indicate an up-down direction, a left-right direction and a front-back direction of the pedal device 301 of the electronic keyboard apparatus, respectively.
  • the second reaction force application mechanism 42 is composed of the second spring 43 and the moveable stopper 44.
  • a second reaction force application mechanism 342 (or second reaction force application device) is composed of a second spring 343 (or a part of the second reaction force application device).
  • the pedal device 301 in accordance with the third embodiment has an actuator 341 that is attached to the bottom surface of the third pedal 40.
  • the actuator 341 has a stopper section 341c whose shape is different from that of the actuator 41 of the first embodiment. More specifically, the stopper section 341c is formed in a hollowed out configuration that has an internal space P for fitting the second reaction force application mechanism 342 and is opened at its front and bottom faces.
  • the second reaction force application mechanism 342 is to change the operation load of the third pedal 40 during the course of depression, and is composed of the second spring 343. This second reaction force application mechanism 342 is fitted in the internal space P of the stopper section 341c, thereby being attached to the third pedal 40 in one piece with the actuator 341.
  • the second spring 343 applies a reaction force countering the depression operation to the third pedal 40, is composed of a leaf spring formed by bending a metal plate material such as a stainless steel plate, and is retained between the third pedal 40 and the stopper section 341c of the actuator 341 in a pre-compressed (a pre-pressurized) state.
  • the second spring 343 is compressed in association with the depression operation of the third pedal 40 when the third pedal 40 is depression-operated to the extent exceeding a specified amount, thereby applying a second reaction force countering the depression operation to the third pedal 40.
  • the second spring 343 is provided with a convex section 343a.
  • the convex section 343a is a portion that abuts against the cushion 14 when the third pedal 40 is depression-operated to the extent exceeding the specified amount, and is formed in a downwardly protruding convex shape.
  • the convex section 343a normally protrudes from the bottom face of the stopper section 341c, abuts against the cushion 14 when the amount of depression of the third pedal 40 reaches the specified amount, and enters the internal space P of the stopper section 341c while compressing the second spring 343 when the third pedal 40 is depression-operated to the extent exceeding the specified amount of the third pedal 40.
  • the second spring 343 is provided with a restriction section 343b for restricting the lower limit position of the second spring 343.
  • a restriction section 343b for restricting the lower limit position of the second spring 343.
  • a cushion 345 composed of shock absorbing material, such as, felt, urethane form or the like is attached to the bottom face of the restriction section 343b.
  • the restriction section 343b abuts against the inner bottom face of the stopper section 341c through the cushion 345, whereby the impact of the second spring 343 is alleviated. By this, thudding sounds can be suppressed.
  • the second reaction force application mechanism 342 is composed only of the second spring 343, such that the number of components can be reduced, and the pedal device 301 can be made smaller in size.
  • first pedal 20, the second pedal 30 and the third pedal 40 are each formed from a metal material such as brass, iron steel and the like into an elongated plate shape.
  • metal material such as brass, iron steel and the like
  • resin material such as ABS resin, POM resin or the like may be formed into an elongated plate shape.
  • the pedal devices 1,201 and 301 are each formed with three pedals, i.e., the first pedal 20, the second pedal 30 and the third pedal 40 are described.
  • they may each be formed only from the third pedal 40, or may be formed from two pedals, for example, the first pedal 20 or the second pedal 30 and the third pedal 40, or may be formed from four or more pedals including the third pedal 40.
  • first pedal 20 and the second pedal 30 correspond to the soft pedal and the sostenuto pedal of an acoustic piano, respectively, and are structured to give sound effects similar to those of the soft pedal and the sostenuto pedal to musical sounds of an electronic keyboard apparatus.
  • they can be structured to give other sound effects different from those of the soft pedal and the sostenuto pedal to musical sounds of the electronic keyboard apparatus.
  • the description is made as to examples in which the second spring 43 that applies the second reaction force to the third pedal 40 is formed from a coil-shaped compression spring, and the second spring 343 is formed from a leaf spring.
  • the other elastic material for example, an elastic member composed of rubber elastic material, resin material or the like may be exemplified.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
EP11153681.9A 2010-03-03 2011-02-08 Appareil à pédale pour instrument électronique à clavier Active EP2372694B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010046624A JP5653051B2 (ja) 2010-03-03 2010-03-03 電子鍵盤楽器のペダル装置
US201013978311A 2010-12-23 2010-12-23

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EP2372694A2 true EP2372694A2 (fr) 2011-10-05
EP2372694A3 EP2372694A3 (fr) 2012-01-11
EP2372694B1 EP2372694B1 (fr) 2016-08-24

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CN111696498A (zh) * 2019-03-14 2020-09-22 卡西欧计算机株式会社 键盘乐器以及键盘乐器的计算机执行的方法

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JP2004334008A (ja) 2003-05-09 2004-11-25 Yamaha Corp 電子鍵盤楽器のペダル装置
JP2010046624A (ja) 2008-08-22 2010-03-04 Takasago Thermal Eng Co Ltd 排オゾンの処理方法及び排オゾン処理システム

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US4744279A (en) * 1986-05-30 1988-05-17 Livingston Duane P Adjustable drum pedal device
JP3059105B2 (ja) * 1996-07-12 2000-07-04 ローランド株式会社 電子打楽器のペダル装置
US7459626B2 (en) * 2004-11-05 2008-12-02 Roland Corporation Apparatus and method for detecting displacement of a movable member of an electronic musical instrument
US7956261B2 (en) * 2008-03-24 2011-06-07 Yamaha Corporation Pedal apparatus of electronic musical instrument
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JP2004334008A (ja) 2003-05-09 2004-11-25 Yamaha Corp 電子鍵盤楽器のペダル装置
JP2010046624A (ja) 2008-08-22 2010-03-04 Takasago Thermal Eng Co Ltd 排オゾンの処理方法及び排オゾン処理システム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111696498A (zh) * 2019-03-14 2020-09-22 卡西欧计算机株式会社 键盘乐器以及键盘乐器的计算机执行的方法
CN111696498B (zh) * 2019-03-14 2023-08-15 卡西欧计算机株式会社 键盘乐器以及键盘乐器的计算机执行的方法

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EP2372694A3 (fr) 2012-01-11
EP2372694B1 (fr) 2016-08-24

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