CN101169933B - Keyboard apparatus of electronic musical instrument - Google Patents

Abstract

A keyboard apparatus of an electronic musical instrument has a plurality of pivoting members (white key main body 1, black key main body 2, and massive body 28) which pivot in response to depression or release of keys, a frame 3 which supports the pivoting members, and action restricting members (lower limit stopper 5 and upper limit stopper 6) which cause collision thereof with the pivoting members to restrict a range in which the pivoting members are allowed to pivot. The action restricting member contains a plurality of grains 11 in an enclosure member 12, and is arranged, in a state where inflow and outflow of air are allowed between the closed area and outside air, at the frame's side.

Description

The key board unit of electronic musical instrument

Technical field

The present invention relates to the key board unit of electronic musical instrument, the stopper element that particularly relates to the key that limits key board unit and pivot with the mass of key pivot in unison.

Background technology

Usually, in the key board unit of electronic musical instrument, when being pressed, key allow the scope that key pivots (from initial position to maximum pivoted position) to be subjected to being arranged on the upper limit retainer on the keyframe and the restriction of lower limit retainer.Figure 20 A to Figure 20 C is the right view of the conventional key board unit of schematically illustrated electronic musical instrument.This key board unit has white key main body 1, black key main body 2 and keyframe 3.This keyframe 3 vertically has preceding end difference and a back end difference along key, and has horizontal part 3a between described end difference.The rear end of horizontal part 3a is provided with key support 3b.

The rear end of white key main body 1 is provided with key pivot part 1b.White key main body 1 utilizes key pivot part 1b to be fixed to key support 3b, to pivot around key pivot part 1b.White key main body 1 has right side and the left side that forms from the both sides of end face downwards.White key main body 1 also has near the left and right a pair of locking plate 1c of the midpoint the front end 1a that is arranged on right side and left side, and described locking plate suspends downwards from right side and left side.The front end 1d of locking plate 1c is approximated to crooked squarely towards inside (depth) direction of key.Black key main body 2 with the similar position of the position component of Bai Jianzhong on also have key pivot part 2b and locking plate 2c.On the preceding end difference of keyframe 3, form a plurality of parallel slit 3c vertically, make the front end 2d of locking plate of the front end 1d of locking plate of white key and black key can insert in the corresponding slit 3c.

The horizontal part 3a of keyframe 3 is provided with bond switching 4.On the bottom surface of white key main body 1 and black key main body 2, unshowned protuberance (actuator) is set with relative with bond switching 4.On the bottom surface of the horizontal part 3a of keyframe, along key the upper limit retainer 182 of shape as band shape is set, so that upper limit retainer 182 is relative with the end face of the front end 1d of locking plate 1c.Lower limit retainer 181 is set, and the shape that makes this lower limit retainer 181 is as band shape on the end face of horizontal part 3a.In shown example, Bai Jian has identical structure with black key.

But consider the repeatability of damping, noise reduction and range of pivot, upper limit retainer 182 and lower limit retainer 181 need be made by the material with elastic-restoring force.Usually, use the material as upper limit retainer and lower limit retainer such as felted terxture, polyurethane elastomer.When player's pressing key, bond switching 4 is flexibly compressed to open switch.When further pressing key, lower limit retainer 181 is subjected to the bump on the left side of white key main body 1 or black key main body 2 and right side and elastic deformation.When elastic deformation, internal friction power makes kinetic energy convert heat energy to, thereby makes the key damping.Instantly place restrictions on moving part 181 when elastic deformation is restored, lower limit retainer 181 produces elastic-restoring forces.This elastic-restoring force becomes the repulsive force (being called screen resilience) to key.This screen resilience is transferred into player's finger by white key main body 1 or black key main body 2, causes the player that discomfort is arranged.

When release key, the power (effect of for example unshowned recovery spring) that key is restored makes white key main body 1 or black key main body 2 be back to initial position.When key returned, end face and the upper limit retainer 182 of the front end 1d of locking plate 1c collided.When collision, the elastic-restoring force of upper limit retainer 182 becomes the repulsive force of dialogue key main body 1 or black key main body 2.Because this repulsive force applies towards the direction relative with the power that key is restored, therefore white key main body 1 or black key main body 2 produce to rock up to key and stop fully.If player's finger and key contacts, then this rocks and is passed to the player, thereby makes the player produce discomfort.

In addition, a kind of key board unit of electronic musical instrument of routine is arranged, the mass of this key board unit and player pivot to pushing synchronously of key, provide the key sense of touch approaching with the key sense of touch of acoustic piano for the player thus.The upper limit of pivot mass is subjected near the back free end of moment of inertia generating unit the restriction with the collision of upper limit retainer.When release key so that its when being back to original state, the position of mass is subjected near the rear end of moment of inertia generating unit the restriction with the collision of lower limit retainer.The upper limit retainer and the lower limit retainer that are provided for above-mentioned mass can also absorb the vibration of the moment of inertia of mass, thereby make the mass damping.Upper limit retainer produces repulsive force when ordering about mass and upper limit retainer and bump, and places restrictions on moving part at present with the collision of lower limit retainer and produce repulsive force when mass returns back to.

In Jap.P. No.2003-195853 invention disclosed, for the upper limit retainer that is provided for hammer (mass), " MB of Quality Mgmt Dept " is provided with upper limit retainer.In this " MB of Quality Mgmt Dept ", mass is clipped in down between cushion and the last cushion.This mass by by with ameripol or rubber and metal powder mixed resilient material make, this material has suitable quality and flexibility thus.In addition, Jap.P. No.2003-195853 also discloses " MB of Quality Mgmt Dept " can adopt the chain tinsel or by bag member that the shape member forms that sand or metal powder are packed into, this member has and the whole width of key or the identical width of width of a plurality of keys thus." MB of Quality Mgmt Dept " waits the rear portion that is fixed to the chassis by engaging, or by should " Quality Mgmt Dept " being held with flat member is folding from bottom to top.

In Jap.P. No.2003-195853 invention disclosed, mass MB is by the bump of underlay acceptance from hammer.Mass MB is engaged by last pad and is fixed to the chassis.Therefore, do not bring into play its performance fully by bag member that the shape member forms that sand or metal powder are packed into.In addition, in Jap.P. No.2003-195853, research is not used for sand or the metal powder bag concrete structure of shape member of packing into.For example, the structure of the filling member of research filling sand or metal powder and be applied in this case concrete structure promptly, is not utilized the concrete structure of conventional stopper element under the situation that the MB of Quality Mgmt Dept uses of felted terxture.In addition, do not have yet research be encased in filling in the member sand or the long-time stability of metal powder.And, do not study this situation, that is yet, be encased in sand or the metal powder of filling in the member and can move to not desired region owing to musical instrument is resisted against on the support of wall or musical instrument.

Summary of the invention

The present invention is used to address the above problem, its purpose is to provide a kind of key board unit with electronic musical instrument of restraint member, the restriction of this restraint member allows the range of pivot of the pivot member such as key and mass, and this restraint member has the concrete structure of the key sense of touch that raising perceives by the player.In addition, another object of the present invention is to provide the key board unit of electronic musical instrument with restraint member, the restriction of this restraint member allows the range of pivot of the pivot member such as key and mass, and this restraint member has under the closure member that surrounds a plurality of particles is used as the situation of restraint member makes the restraint member keep the concrete structure of its performance for a long time.

Characteristics of the present invention are to provide a kind of key board unit of electronic musical instrument, and this key board unit comprises: a plurality of pivot members, each described pivot member all respond pushing of key or discharge and pivot; Framework, it supports described pivot member, so that described pivot member can pivot; And the restraint member, itself and described pivot member produce collision, allow the scope of described pivot member pivot with restriction; Wherein: in closed region this restraint member, that partly or wholly surround by a closure member, hold a plurality of particles, and allowing air under the situation that flows between this closed region and the extraneous air and flow out, in frame side this restraint member is being set along the direction that is provided with of described pivot member.In this case, described closure member for example has gas penetration potential.And described closure member is fixed to a ventilative base portion, and described thus closure member and described ventilative base portion form this closed region.As in the key board unit of above-mentioned structure, when pivot member and described restraint member impacts, described particle slides and collision mutually, causes significant internal loss.In addition, because the permission air flows into and flows out, therefore when described pivot member and described restraint member impacts, the repulsive force that may cause by the air pressure inside of described closure member will can not be produced between closed region and extraneous air.Thus, any repulsive force will can be applied on the described pivot member by the restraint member.Thereby when player's operation keyboard device, the key board unit with these characteristics has improved the key sense of touch that is perceived by the player.

Described closure member is netted closure member, and for example, preferably, this netted closure member is designed so that the size of the size of netted opening less than the minimum transverse shape of described particle, and thus, this netted closure member can prevent that particle from passing this netted opening.This closure member for example can be the film with a plurality of pores.Preferably, this film design becomes to make the size of the opening size of each pore less than the minimum cross-section shape of described particle, and thus, this film can prevent that particle from passing this pore.Expand according to the power on this closure member of being applied to from the outside or dwindle in the surface that this closure member for example is designed so that this closure member.In this case, this restraint member can hold many particles in its closed region, and can not hinder the slip and the collision of the particle that is surrounded by this closure member.At this base portion is under the breathable situation, and the film that is used as closure member can not have pore.

In some instances, described closed region is surrounded fully by this closure member.In other example, described closed region is surrounded fully by described base portion and described closure member.And in some instances, this base portion and this framework are provided with independently.In other example, this base portion is exactly a framework self.

As the key board unit of above-mentioned structure in, be positioned on this restraint member and be in the below that this restraint member is fixed to the position of this frame side with point that this pivot member collides.Because particle is assembled downwards owing to gravity, thereby as the key board unit of above-mentioned structure can remain on this closure member exactly and with the point that this pivot member collides, can also limit initial position, maximum pivoted position and the range of pivot of this pivot member exactly.

As the key board unit of above-mentioned structure in, this key board unit also comprises: elasticity restraint member, it is used to apply the repulsive force bigger than the repulsive force of restraint member; Wherein this restraint member and this elasticity restraint member are positioned at this frame side, thus when this pivot member pivot, this pivot member with the restraint member impacts before collide with elasticity restraint member.This elasticity restraint member that produces repulsive force produces and is used to make it to be returned to the bigger restoring force of original shape.Therefore, preferably, this key board unit be designed so that this pivot member with the restraint member impacts before collide with elasticity restraint member, with the accurate position of guaranteeing that this pivot member bumps.As a result, guaranteed the accurate restriction of initial position, maximum pivoted position and range of pivot to this pivot member as the key board unit of above-mentioned structure.When this pivot member and restraint member impacts, this restraint member has absorbed collision energy and has not produced repulsive force.

In addition, some key board units have the mass that synchronously pivots with pushing of key, and other key board units do not have mass.In the restraint member, particle is surrounded by ventilative closure member, and this restraint member can be used for the range of pivot of limit key or mass.Perhaps, this restraint member can be used for the two range of pivot of limit key and mass.Because the moment of inertia of mass is greater than the moment of inertia of key, therefore be used to limit under the situation of range of pivot of mass at the restraint member, this restraint member is more effective.If the restraint member does not adopt this restraint member, promptly within it, particle is surrounded by ventilative closure member, and the restraint member can adopt conventional elasticity restraint member so.The restriction of range of pivot is comprised restriction to upper limit position and lower position.In the restraint member, particle is contained in the closed region with ventilative closure member, and this restraint member can be used to limit upper limit position or lower position.Perhaps, this restraint member can be used to limit upper limit position and these two positions, lower position.Under the restraint member is used to limit the situation of pushing the pivot that is caused by key (usually, restriction to upper limit position is used for key, and the restriction to the lower position is used for mass), especially, because this restraint member utilizes the player under the state of finger presses key and operates, thereby as the key board unit of above-mentioned structure improved the key sense of touch that perceives by the player significantly.

Another characteristics of the present invention are to provide a kind of key board unit of electronic musical instrument, and this key board unit comprises: a plurality of pivot members, each described pivot member all respond pushing of key or discharge and pivot; Framework, it supports described pivot member, so that described pivot member can pivot; And the restraint member, itself and described pivot member produce collision, allow the scope of pivot member pivot with restriction; Wherein, in closed region described restraint member, that partly or wholly surround by a closure member, hold a plurality of particles, and in frame side described restraint member is set along the direction that is provided with of described pivot member; And this closed region that is surrounded by this closure member is provided with the constrained motion member that is used to limit movement of particles.As in the key board unit of above-mentioned structure, when pivot member and described restraint member impacts, described particle slides and collision mutually, thereby causes significant internal loss.As a result, the repulsive force that is applied on the described pivot member by described restraint member is little.Thus, when player's operation keyboard device, the key board unit with these characteristics has improved the key sense of touch that is perceived by the player.In addition, move along the direction that is provided with of this pivot member because the constrained motion member limits particle, thereby this key board unit is guaranteed the long-term behaviour of described restraint member.

As the key board unit of above-mentioned structure in, described constrained motion member is arranged to make constrained motion portion to be positioned at as a plurality of points (or place, at least a portion position of a plurality of positions (location) of the mid point point) (midpoint), described a plurality of points are the points that are positioned on the described closure member and collide with described pivot member.Because described pivot member can not disturb described constrained motion member, therefore, has guaranteed the damping performance of restraint member.

As the key board unit of above-mentioned structure in, described constrained motion member is arranged to make in a plurality of constrained motion portion each in each position as the mid point between a plurality of points, and described a plurality of points are the points that are positioned on the described closure member and collide with described pivot member; And described constrained motion member has a plurality of inclined walls, and the least significant end of described inclined wall is the point that collides with described pivot member, and the most significant end of described inclined wall is the position that described constrained motion portion is set.According to this key board unit, when described pivot member no longer was in collision status, gravity can make particle move to the point of described pivot member collision, thereby causes particle to return back to their original state.

As the key board unit of above-mentioned structure in, described constrained motion member is the wall member of near vertical ground setting.This key board unit has and is used to limit be provided with the simplest structure that direction move of particle along described pivot member.Preferably, because when particle moves upward owing to described pivot member and described closure member collide and when particle moves downward owing to gravity, wall member will can not hinder the motion of particle, thus, described restraint member is used as upper limit retainer, in described restraint member, described wall member is positioned at the inside of described closure member.Thus, this key board unit has been guaranteed the response to the restraint member.

As the key board unit of above-mentioned structure in, described constrained motion member partly engages with described closure member.This key board unit prevents that described constrained motion member from moving in described closure member.In addition, this key board unit is also avoided the distortion of the shape of cross section of moving of closure member self and described closed region.

Equally, as the key board unit of above-mentioned structure in, described pivot member is at least a in described key and the mass that synchronously pivots with pushing of described key.

Another characteristics of the present invention are to provide a kind of key board unit of electronic musical instrument, and this key board unit comprises: a plurality of pivot members, each described pivot member all respond pushing of key or discharge and pivot; Framework, it supports described pivot member, so that described pivot member can pivot; And the restraint member, itself and described pivot member produce collision, allow the scope of described pivot member pivot with restriction; Wherein: in closed region this restraint member, that partly or wholly surround by a closure member, hold a plurality of particles, and along described pivot member direction is set under the situation that forms a plurality of sealings on this closure member, in frame side this restraint member is set along the direction that is provided with of described pivot member.As in the key board unit of above-mentioned structure, when pivot member and described restraint member impacts, described particle slides and collision mutually, thereby causes significant internal loss.As a result, the repulsive force that is applied on the described pivot member by described restraint member is little.Thereby when player's operation keyboard device, the key board unit with these characteristics has improved the key sense of touch that is perceived by the player.Because the closed region of described restraint member is divided into a plurality of zones by described sealing, thereby this key board unit prevents that particle from moving along the direction that is provided with of described pivot member.As a result, this key board unit is guaranteed the long-term behaviour of described restraint member.In addition, even under this key board unit rests on situation on the wall, perhaps under the situation that this key board unit is longitudinally kept by support, this key board unit also can be guaranteed the performance of restraint member.Under described sealing was served as reasons situation about forming from the member of the described closure member of external compression of described closure member, this key board unit kept described sealing reliably for a long time.And under the described sealing situation that described closure member forms self by physical treatment, this key board unit keeps described sealing reliably for a long time.In addition, in that described closure member forms under the situation of described sealing by physical treatment, the formation of described sealing is easy.

As the key board unit of above-mentioned structure in, described closure member forms tubulose along the direction that is provided with of key.According to this key board unit, the formation of described sealing is easy, and also is easy to the processing of particle.

As the key board unit of above-mentioned structure in, described closure member forms in the following manner,, a rectangle plane material is folded into bilayer that is, the end of this rectangle plane material is engaged to form tubulose then.Therefore, allow described closure member to form by the rectangle plane material of cheapness.

As the key board unit of above-mentioned structure in, described sealing forms in the following manner, that is, along partly pushing this closure member, stacked then for two-layer and make this two-layer joint with the approximate straight line that forms with the approximately perpendicular direction of direction that is provided with of described pivot member; And described constrained motion member is arranged on frame side, and described thus pivot member collides with a plurality of points that are positioned on the described closure member with the angle approximately perpendicular to described sealing.According to this key board unit, owing to be positioned on the described sealing and have identical deformed shape with each point that described pivot member collides, so will shape distortion can not take place.Thus, this key board unit has been guaranteed the performance of described restraint member.

As the key board unit of above-mentioned structure in, described sealing forms by pushing this closure member, so that described sealing is approximate point-like.According to this key board unit, even described pivot member collides with described closure member at any angle, the shape distortion that is caused by described sealing can not take place yet.Thereby key board unit has been guaranteed the performance of described restraint member.

As the key board unit of above-mentioned structure in, described sealing is arranged at least a portion position as a plurality of positions of the mid point between a plurality of points, described a plurality of points are the points that collide with described pivot member, and described a plurality of point is positioned on the described closure member.Because described pivot member will can not disturb described sealing, therefore guaranteed the performance of described restraint member.

As the key board unit of above-mentioned structure in, described pivot member is at least a in described key and the mass that synchronously pivots with pushing of described key.

Description of drawings

Figure 1A to Fig. 1 C is the synoptic diagram that the first embodiment of the present invention is shown;

Fig. 2 is the right view of the schematically illustrated second embodiment of the present invention;

Fig. 3 A to Fig. 3 C is the synoptic diagram that the behavior state of the closure member that uses among Figure 1A to Fig. 1 C and the embodiment shown in Figure 2 is shown;

Fig. 4 A to Fig. 4 F is the synoptic diagram that the instantiation of the closure member that uses among Figure 1A to Fig. 1 C and the embodiment shown in Figure 2 is shown;

Fig. 5 is the synoptic diagram that the third embodiment of the present invention is shown;

Fig. 6 is the synoptic diagram that the fourth embodiment of the present invention is shown;

Fig. 7 A and Fig. 7 B illustrate the synoptic diagram that gravity is applied to the action on the particle that is provided for upper limit retainer;

Fig. 8 A to Fig. 8 C is the synoptic diagram that the instantiation of lower limit retainer shown in Figure 2 is shown, and this example shows the restraint member that inside has the constrained motion member;

Fig. 9 A is the synoptic diagram that the different instantiations of lower limit retainer shown in Figure 2 are shown with Fig. 9 B, and these examples show the restraint member that inside has the constrained motion member;

Figure 10 A is the synoptic diagram that other different instantiations of lower limit retainer shown in Figure 2 are shown with Figure 10 B, and these examples show the restraint member that inside has the constrained motion member;

Figure 11 A to Figure 11 D is the synoptic diagram that the instantiation of upper limit retainer shown in Figure 2 is shown, and these examples show the restraint member that inside has the constrained motion member;

Figure 12 A to Figure 12 D is the synoptic diagram that the different instantiations of upper limit retainer shown in Figure 2 are shown, and these examples show the restraint member that inside has the constrained motion member;

Figure 13 is the synoptic diagram that other different instantiations of upper limit retainer shown in Figure 2 are shown, and this example shows the restraint member that inside has the constrained motion member;

Figure 14 is the synoptic diagram that the instantiation of lower limit retainer shown in Figure 2 is shown, and this example shows the restraint member that the outside has the retardation motion member;

Figure 15 A and Figure 15 B are the synoptic diagram that the instantiation of lower limit retainer shown in Figure 2 is shown, and this example shows the restraint member, and the closure member of this restraint member has sealing;

Figure 16 A to Figure 16 C illustrates the synoptic diagram with Figure 15 A and different instantiations of the tubulose closure member shown in Figure 15 B;

Figure 17 A to Figure 17 E is the synoptic diagram that the key board unit that adopts the tubulose closure member is shown, and this tubulose closure member has the approximate linear sealing shown in Figure 15 A and Figure 15 B;

Fig. 18 is for illustrating the synoptic diagram of different instantiations, and this example shows sealing and forms on the tubulose closure member shown in Figure 15 A and Figure 15 B;

Figure 19 A and Figure 19 B are the schematic plan that the instantiation of lower limit retainer shown in Figure 2 is shown, and this vertical view shows the layout that is formed at the sealing on the closure member; And

Figure 20 A to Figure 20 C is the right view of the key board unit of schematically illustrated conventional electrical musical instrument.

Embodiment

Figure 1A to Fig. 1 C shows the key board unit according to the electronic musical instrument of the first embodiment of the present invention.Figure 1A is the right view of schematically illustrated key board unit.Figure 1B is schematically illustrated to be provided for the behavior state of the particle of lower limit retainer 5 when observing from the right side.Fig. 1 C is schematically illustrated to be provided for the behavior state of the particle of lower limit retainer 5 when observing from the front.In Figure 1A to Fig. 1 C, the parts employing identical with the parts of using among Figure 20 Reference numeral identical with the Reference numeral among Figure 20 represented, and omission is to the description of these parts.The structure of lower limit retainer 5 among Figure 1A (restraint member) and upper limit retainer 6 (restraint member) is different from the structure of the parts that adopt among the Figure 20 that describes in the background technology.The structure of the restraint member of the black key main body 2 (pivot member) of Figure 1A also is different from the structure of the parts that adopt among Figure 20.

With reference to Figure 1B and Fig. 1 C, be described in detail as an example with the lower limit retainer 5 that is provided for white key main body 1.Utilize ventilative closure member 12 that lower limit retainer 5 is partly or wholly surrounded, so that in the closed region of lower limit retainer 5, hold a plurality of particles 11.Lower limit retainer 5 is positioned on the horizontal part 3a of keyframe 3 (framework), and this horizontal part 3a is as the base portion of lower limit retainer 5.Closure member is sealed and be fixed on this base portion.Lower limit retainer 5 extends along the direction that is provided with of a plurality of keys of key board unit.This lower limit retainer 5 needn't be positioned at keyframe 3 from one's body, also can be positioned at as keyframe 3 and keep regularly on any parts of key board unit.Particle 11 is a solid body, and illustrates with spherical object.Being shaped as under the spherical situation of particle 11, preferably the diameter of particle 11 is 3 millimeters or littler.Described in Jap.P. 2003-19853 communique, particle 11 can be sand or metal powder.In addition, particle 11 also can be spherical ceramic, spherical metal, plastics ball etc.Yet the shape of particle 11 also needn't be sphere.

The closure member 12 that limits the behavior state of the particle 11 that is comprised is made by thin flexible material (being also referred to as membraneous material) comprehensively.Limited degree can freely determine according to the flexible degree of closure member 12, yet, preferably have such limited degree, that is, this limited degree can not prevent to be passed to particle 11 by the kinetic energy that collision produces.More particularly, closure member 12 is this type, that is, because the elasticity that material had of closure member 12 allows the surface area of closure member 12 to enlarge or contraction according to the power that is applied to closure member 12.Perhaps, closure member 12 can be this type, that is, be out of shape flexibly or fluff, for example cloth.Closure member 12 is sealed and engage or be welded to horizontal part 3a as the base portion of lower limit retainer 5, thereby prevents that particle 11 from scattering.

When the lower end of the left side of white key main body 1 1e and right side 1f and closure member 12 collisions, be transferred into particle 11 by closure member 12 by the kinetic energy of this collision generation.When particle 11 mutually collision or slide continuously,, this kinetic energy disappears thereby being converted into heat energy with when any direction moves.Because elastic energy can not accumulated, therefore will can not produce repulsive force to pivot member.Therefore, key board unit can be eliminated the uncomfortable key sense of touch that the player feels.Because the effect of eliminating kinetic energy by closure member 12 and particle 11 direct collisions, therefore, has been improved in the left side 1e of white key main body 1 and the lower end of right side 1f, this effect produces by moving of particle 11.In addition, because ventilative closure member 12 is contained in the ventilation area particle 11, thereby will can not produce the elasticity repulsive force that comes from air pressure.

In the above description, described lower limit retainer 5 (restraint member), yet similarly, upper limit retainer 6 (restraint member) is positioned on the downside of horizontal part 3a of keyframe 3, this horizontal part 3a is as the base portion of this upper limit retainer 6.The closure member 12 of this upper limit retainer 6 is also sealed and be fixed on this base portion.Yet particle 11 is accepted this relation under the situation that relation between the direction of impact force and the direction that particle 11 is accepted gravity is different from lower limit retainer 5.Therefore, upper limit retainer 6 has essentially identical structure with lower limit retainer 5, yet the structure between upper limit retainer 6 and the lower limit retainer 5 can change.

In this manual, particle 11 will be called " particle bag " for short by this structure of closure member 12 sealings.At least one of them of lower limit retainer 5 or upper limit retainer 6 can have " particle bag " structure, and another retainer is made of the conventional elasticity restraint member (being called elasticity restraint member hereinafter) that adopts felted terxture etc. to make.

Fig. 2 is the right view of key board unit of the electronic musical instrument of the schematically illustrated second embodiment of the present invention.This key board unit has white key main body (pivot member) 21, black key main body (pivot member) 22 and keyframe (framework) 23.On keyframe 23, vertically forwardly with in the rear portion a plurality of end differences are set along key.Between a plurality of end differences, be provided with horizontal part 23a.The rear portion of horizontal part 23a is provided with key support 23b.Following forequarter at horizontal part 23a is provided with mass support 23c.Rear end in white key main body 21 and black key main body 22 is respectively arranged with key pivot part 21b, 22b.White key main body 21 and black key main body 22 are fixed to key support 23b at key pivot part 21b, 22b place respectively, so that white key main body 21 and black key main body 22 can pivot around key pivot part 21b, 22b respectively.

Front and back at the end difference of keyframe 23 is respectively arranged with installation portion 23d, 23e, so that keyframe 23 is mounted to keyframe base plate 24.The front of installation portion 23d is vertical wall 23f.Keyframe base plate 24 can be the fixed component of keyframe side, for example the lower house of electronic musical instrument (frame plate).On vertical wall 23f, be provided for the key guiding piece 25 of white key main body 21.Key guiding piece 25 inserts the approaching bottom of leading section 21a with white key main body 21, with the lateral attitude of limit key with roll.Setting is fixed to key guiding piece 26 horizontal part 23a, that be used for black key main body 22.The bond switching 4 similar to bond switching shown in Figure 1 is set on the horizontal part 23a of keyframe.Downside in white key main body 21 and black key main body 22 is provided with unshowned protuberance (actuator), with relative with bond switching 4.

Stretch out power transport unit 21c from the bottom of white key main body 21, to pass the hole 23g on the horizontal part 23a that is arranged on keyframe.The end of this power transport unit 21c has base plate.Be provided with the perforation of opening towards the rear side longitudinally of key on the top of this base plate.On the end face of this base plate and bottom surface, be fixed with elastic component 27 (end face is sightless).For each white key main body 21 and black key main body 22 are provided with mass 28.More particularly, mass 28 is along the below that direction is arranged at each key that is provided with of key.Be provided for white key main body 21, shown mass 28 is by mass support 23c supporting, so that the power transport unit 21c of mass 28 by correspondent button pivots.

Mass 28 comprises: pivot part 28c, by corresponding mass support 23c supporting; Main drive division 28a and time drive division 28b are positioned at the front of pivot part 28c and engage with the power transport unit 21c of key; With arm shape moment of inertia generating unit 28d, be positioned at the back of pivot part 28c, and be used to produce moment of inertia.The rear end of this moment of inertia generating unit 28d is the 28e of mass concentration portion.

Main drive division 28a and time drive division 28b engage with power transport unit 21c, are clipped between main drive division 28a and the inferior drive division 28b by elastic component 27 with the base plate of the transport unit 21c that exerts all one's strength.When mass 28 synchronously pivoted to pushing of key with the player, definite retroaction was sent to player's finger from white key main body 21 according to the moment of inertia that is produced by moment of inertia generating unit 28d.When the player unclamps when finger from key, this mass 28 since the effect of gravity pivot backward, thereby turn back to shown position.

Power transport unit unshowned, black key main body 22 is positioned at upper/lower positions, that is, this power transport unit is along inward direction and the power transport unit 21c position overlapped of Fig. 2.Thereby, for black key main body 22 similar mass being set equally also, this mass is pivoted to allow this mass by the mass support part supports.The mass that is used for black key main body 22 is rotated by the power transport unit of corresponding black key.

On the end face of horizontal part 23a, the lower limit retainer 5 that is used for key is arranged to the band shape as the example of Fig. 1.On the bottom surface of the horizontal part 23a of keyframe, be provided for the upper limit retainer (restraint member) 30 of mass 28.When mass 28 synchronously pivoted with pushing of dialogue key main body 21, this upper limit retainer 30 limited the upper limit position of mass 28 by the utilization and the collision of the end face of the 28e of mass concentration portion.On keyframe base plate 24, be provided for the lower limit retainer (restraint member) 29 of mass 28.When the release of mass 28 and white key main body 21 synchronously pivoted, this lower limit retainer 29 limited the initial position of mass 28 by the utilization and the collision of the bottom surface of the 28e of mass concentration portion.

Upper limit retainer 30 and lower limit retainer 29 have as shown in Figure 1 upper limit retainer 6 and " particle bag " structure in the example of lower limit retainer 5.The kinetic energy that produces owing to the collision by mass 28 is bigger than the kinetic energy that the collision by key produces, and it is therefore preferable that upper limit retainer 30 and lower limit retainer 29 are designed to have bigger " particle bag ", to eliminate more energy.Have the keyboard structure of mass and pivotal orientation and be not limited to as shown in Figure 2 structure and direction.In some keyboards, the mass that tilts in initial position vertically raises when key is pressed.This keyboard can be designed to make when mass vertically raises " particle bag " along continuous straight runs to accept collision.Perhaps, mass can be positioned at upper limit place at initial position, and is positioned at the lower limit place when key is pressed fully.

Fig. 3 A to Fig. 3 C shows the behavior state of the closure member 12 that uses among Figure 1A to Fig. 1 C and the embodiment shown in Figure 2.To the example of the lower limit retainer 29 shown in Fig. 2 be described.Closure member 12 has such elasticity: allow its surface to enlarge according to the inside and outside power that applies and dwindle.Fig. 3 A shows the original state of this closure member 12.Shown in Fig. 3 B, the impact force that is produced by 28e of mass concentration portion and 29 collisions of lower limit retainer causes closure member 12 along continuous straight runs to enlarge, yet closure member 12 applies sufficient convergent force so that particle 11 is limited in the closed region, and limits the behavior state of particle 11 fully.By the flexibility of control closure member 12, this key board unit can provide the key sense of touch of expectation for the player.Shown in Fig. 3 C, when the 28e of mass concentration portion when lower limit retainer 29 discharges, the closure member 12 of expansion is owing to its elastic-restoring force shrinks to be back to the original state shown in Fig. 3 A.

With reference to Fig. 4 A to Fig. 4 F, will the instantiation of closure member and the representative configuration of base portion be described.Fig. 4 A to Fig. 4 F shows the instantiation of the closure member 12 that uses among Figure 1A to Fig. 1 C and the embodiment shown in Figure 2.In the instantiation shown in Fig. 4 A, use netted closure member 41 as closure member 12.More particularly, netted closure member 41 can be the cloth that is woven into line, by the thread braid of braiding etc.This netted closure member 41 can be by interlaced many thread nonwoven fabrics.The gas penetration potential of this netted closure member 41 allows air to flow between zone of limiting particle 42 and extraneous air and flows out.Suppose that closure member 12 is airtight, and the closed region comprises a large amount of air, then the collision with pivot member (key or mass) can cause the superficial expansion of closure member 12, thereby shows the effect of air cushion.Thus, produce elastic-restoring force, thereby can not reach desired effects.

Yet if netted closure member 41 is enough coarse to allow particle 42 to pass, particle 42 may drain to the outside like this.Because particle 42 can move along any direction, therefore, this netted closure member 41 is designed so that particle 42 can not pass the opening of net.At particle 42 is under the aspheric situation, and shown in Fig. 4 B, shape of cross section is according to the difference of cutting position and difference.In this case, be regarded as direction of passage 43 towards direction towards plane with minimum cross-section shape 42a.Therefore, shown in Fig. 4 C, as principle, preferably netted closure member is designed so that the size of the size of netted opening less than minimum cross-section shape 42a, and thus, this netted closure member 41 can prevent that particle 42 is by netted opening.This netted closure member 41 extends along the direction that is provided with of key, yet, can be coated with the material identical materials with netted closure member 41 along the two ends of this netted closure member 41 that the direction location is set of key, skid off to prevent particle 42.Perhaps, can adopt any different member to seal this two ends.

Fig. 4 D shows the instantiation that film 44 is used as closure member 12.As for film 44, can use plastics, natural rubber, synthetic rubber etc.Polyfoam, scum rubber etc. also can be used as film 44.This film 44 is provided with a plurality of pore 44a.These pores 44a can be dispersed on the whole surface that comprises the surface that bumps with pivot member (key or mass).Perhaps, shown in Fig. 4 D, pore 44a can be dispersed on the surface that does not bump.Shown in Fig. 4 E, as principle, preferably, film design becomes to make the size of the size of pore 44a less than the minimum cross-section shape 42a of each particle, and thus, film 44 can prevent that particle 42 from passing pore 44a.

Pore 44a can be Any shape, yet preferably, pore 44a has sharp edge, triangle that goes out as shown and rectangle.In having the pore 44a of same cross-sectional area, because many particles 42 are circular, the pore 44a that therefore has sharp edge more may stop particle 42.Thus, the pore 44a with sharp edge may prevent that particle 42 from passing film 44.In addition, even particle 42 is stuck in the pore 44a, gas penetration potential also can be guaranteed in the space of pore 44a edge.The gas penetration potential of film 44a, in other words, the characteristic of air inflow/outflow can be controlled according to the size of pore 44a and the quantity of pore 44a.

Fig. 4 F shows an example, and the substrate of " particle bag " is provided with a plurality of pores in this example.In this case, setting has the base portion 45 of pore 45a on the horizontal part 3a of framework 3, and between horizontal part 3a and base portion 45 installation portion 46 is set.For this structure, will be as an example with the lower limit retainer 5 shown in Fig. 1.Installation portion 46 has been guaranteed the space of permission air inflow/outflow between base portion 45 and keyframe 3 (horizontal part 3a).Installation portion 46 can be integrally formed with base portion 45 or horizontal part 3a.Perhaps, installation portion 46 can be constructed independently, for example distance piece.As for closure member 12, can use above-mentioned netted closure member 41 or film 44 with pore 44a.Perhaps, can use the film that does not have pore.

In Figure 1A-Fig. 1 C, Fig. 2 and Fig. 3 A to Fig. 3 C, under the situation of not using base portion 45, the fixed component of keyframe 3 sides (or keyframe 3 is own) can be provided with a plurality of pores suitable with pore 45a.Film 44 extends along the direction that is provided with of key, yet the two ends of the film 44 of the direction location of the key that the edge is provided with can be coated with and film 44 identical materials, skid off to prevent particle 11.Perhaps, can use any different member to seal this two ends.

Fig. 5 shows the third embodiment of the present invention.The 3rd embodiment can make conventional elasticity restraint member (for example felted terxture) be added into lower limit retainer 5 respectively and upper limit retainer 6 obtains by first embodiment shown in Fig. 1 is modified as.In Fig. 5, with the similar parts of the parts that use among Figure 1A to Fig. 1 C adopt with Figure 1A to Fig. 1 C in the identical Reference numeral of Reference numeral represent.Felted terxture 51 is provided with the lower limit retainer 5 as " particle bag ", to be used as the lower limit retainer integratedly.Similarly, felted terxture 52 is added into the upper limit retainer 6 as " particle bag ", to be used as upper limit retainer integratedly.

When white key main body 1 is pressed, right flank and left surface and lower limit retainer 5 and felted terxture 51 the two collisions of white key main body 1.Thus, the two advantage is utilized.More particularly, " particle bag " provides high damping property, but the repeatability of shape (initial position of pivot member and the repeatability of actuating range) and relatively poor to the tolerance of repeated presses.Therefore, the initial position of key and the repeatability of actuating range and the tolerance of repeated presses compensated by conventional elasticity restraint member have improved the damping of key and the operability of key board unit thus.In addition, when discharging white key main body 1 so that its when turning back to initial position, white key main body 1 and upper limit retainer 6 and felted terxture 52 collisions.When collision, can utilize the advantage of upper limit retainer 6 and felted terxture 52 similarly.

As shown in Figure 5, the height of supposing lower limit retainer 5 is h1, and the height of felted terxture 51 is h2, and present embodiment is designed so that h1＜h2.Thus, when white key main body 1 pivoted, the right flank of key and left surface at first collided with felted terxture 51, then with lower limit retainer 5 collisions that are provided with together with felted terxture 51.In other words, felted terxture 51 is carried out the elasticity restraint prior to the lower limit retainer 5 as " particle bag ".

After being released then after the key collision, because the elasticity restraint member such as felted terxture has higher restoring force than " particle bag ", thereby felted terxture 51 is returned to its original state immediately.Thus, felted terxture 51 provides stable restraint position for key collision subsequently, to guarantee restraint position accurately.Lower limit retainer 5 as " particle bag " provides the damping performance that does not comprise repulsive force.Similarly, the height of supposing upper limit retainer 6 is h3, and the height of felted terxture 52 is h4, and present embodiment is designed so that h3＜h4.When white key main body 1 turns back to initial position, the front end 1d of retainer and felted terxture 52 collisions, thus felted terxture is carried out the elasticity restraint prior to the upper limit retainer 6 as " particle bag ".

The said structure of the retainer of one has been guaranteed the range of pivot accurately of white key main body 1 by the interval between conventional felted terxture 51 and 52.Therefore, even " particle bag " shows the inaccurate repeatability to vertical position to a certain extent, present embodiment also can improve the accuracy of range of pivot.

Fig. 6 shows the fourth embodiment of the present invention.The 4th embodiment can make conventional elasticity restraint member (for example felted terxture) be added into lower limit retainer 29 respectively and upper limit retainer 30 obtains by second embodiment shown in Fig. 2 is modified as.In Fig. 6, with the similar parts of the parts that use among Fig. 2 adopt with Fig. 2 in the identical Reference numeral of Reference numeral represent.As the situation of the embodiment shown in Fig. 5, felted terxture 61 is added into the lower limit retainer 29 as " particle bag ", and felted terxture 62 is added into the upper limit retainer 30 as " particle bag ".

Thus, dialogue key main body 1 pushes the end face that causes the 28e of mass concentration portion and upper limit retainer 30 and felted terxture 62 collisions.Thereby situation as shown in Figure 5 can be utilized the two advantage of upper limit retainer 30 and felted terxture 62.In addition, when discharging white key main body 1, the bottom surface of the 28e of mass concentration portion turns back to its initial position, and 28e of mass concentration portion and lower limit retainer 29 and felted terxture 61 collide.In when collision, can utilize the two advantage of lower limit retainer 29 and felted terxture 61 similarly.

As shown in Figure 6, the height of supposing upper limit retainer 30 is h1, and the height of felted terxture 62 is h2, and present embodiment is designed so that h1＜h2 equally.Thus, when mass 28 pivoted, felted terxture 62 was prior to carrying out the elasticity restraint of confrontation quantity set middle part 28e as the upper limit retainer 30 of " particle bag ".Similarly, the height of supposing lower limit retainer 29 is h3, and the height of felted terxture 61 is h4, and present embodiment is designed so that h3＜h4.When the 28e of mass concentration portion turned back to initial position, felted terxture 61 was prior to carrying out the elasticity restraint of confrontation quantity set middle part 28e as the lower limit retainer 29 of " particle bag ".By the position control to conventional felted terxture 61 and 62, but said structure has been guaranteed the range of pivot accurately of the 28e of mass concentration portion.Even " particle bag " shows the inaccurate repeatability to vertical position to a certain extent, but present embodiment also can improve the accuracy of range of pivot.

In the embodiment shown in Fig. 5 and Fig. 6, be added into lower limit retainer and upper limit retainer as the felted terxture of conventional stopper element, but to improve the accuracy of range of pivot.But,,, thereby, also can easily determine the position of " particle bag " even without adding conventional stopper element owing to the gravity that is applied on the particle for the upper limit retainer 30 shown in the upper limit retainer 6 shown in Figure 1A and Fig. 2.

Action when Fig. 7 A and Fig. 7 B show on the particle that gravity is applied to upper limit retainer.Fig. 7 A is for being in the part zoomed-in view of the situation lower keyboard device of initial position at the 28e of mass concentration portion.Fig. 7 B is the part zoomed-in view at 28e of mass concentration portion and upper limit retainer 30 case of collision lower keyboard devices.In these figure, with the similar parts of the parts that use among Fig. 6 adopt with Fig. 6 in the identical Reference numeral of Reference numeral represent.In Fig. 7 A, when mass 28 pivots, 28e of mass concentration portion and 30 collisions of upper limit retainer, on this upper limit retainer 30, the point (position of collision) that the 28e of mass concentration portion bumps is positioned at below horizontal part 23a, that be provided with upper limit retainer 30 of keyframe 23.

Be included in " the particle bag " as upper limit retainer 30 many particles 11 since action of gravity assemble downwards, thereby determined the position of the bottom surface of closure member 12.More particularly, will be positioned at the position initialization (resetting) of the particle on the zone that bumps by gravity.When 28e of mass concentration portion shown in Fig. 7 B and 30 collisions of upper limit retainer, particle 11 upwards scatters.And when the 28e of mass concentration portion when upper limit retainer 30 discharges, particle 11 is replied downwards again, shown in Fig. 7 A.Preferably, the density that " particle bag " is designed so that to be contained in the particle 11 in " particle bag " is low, so that the top of " particle bag " has the space, upwards disperses thereby help particle 11.

" the particle bag " described with reference to Fig. 4 A to Fig. 4 E extends equably along key.Move to the position do not expected along key as fruit granule 11 after using a period of time, then " particle bag " will finally lose damping performance.For example, when the right side 1e of white key main body 1 shown in Fig. 1 C and left side 1f collided with closure member 12, the part that just in time is positioned at the below of the right side 1e that collided and left side 1f caved in.When white key main body 1 was then upwards returned, expectation particle 11 can return back to closure member 12 is flattened, yet long-term use can hinder the answer fully of closure member 12.In addition, if electronic musical instrument is settled by slight inclination ground, then particle 11 is non-desirably disperses along the direction that is provided with of key.Therefore, preferably, be provided for limiting the constrained motion member that particle 11 moves along key in closure member 12 inside.Thus, the constrained motion member prevents that particle 11 from moving along the direction that is provided with of pivot member, thereby makes restraint member (lower limit retainer or upper limit retainer) keep damping performance for a long time.

Fig. 8 A to Fig. 8 C shows the instantiation of lower limit retainer shown in Figure 2.In this instantiation, the constrained motion member is arranged in the restraint member.Fig. 8 A is the stereographic map of lower limit retainer 29.Fig. 8 B and Fig. 8 C are the front view that the behavior state of constrained motion member 71 is shown.In these figure, the parts similar with the parts that use among Figure 1A to Fig. 1 C and Fig. 2 adopt with Figure 1A to Fig. 1 C and Fig. 2 in the identical Reference numeral of Reference numeral represent.In Fig. 8 A, omitted particle 11.

Constrained motion member 71 has inclined wall 71a, be bonded into the vertical wall 71b of inclined wall 71a adjacency and support the base portion 71c of vertical wall 71b.The right-hand member of inclined wall 71a is relative with the left end of inclined wall 71a, to form recess betwixt.In constrained motion member 71, inclined wall 71a, the vertical wall 71b adjacent with inclined wall 71a and the base portion 71c that supports vertical wall 71b are regarded as a unit.Constrained motion member 71 is arranged in the closed region that is surrounded fully by keyframe 3 and closure member 12, and this keyframe 3 is as base portion.Constrained motion member 71 is along the direction setting of key, and the shape of the xsect of each unit of constrained motion member 71 is approximate alphabetical M shape.

The point that collides with the 28e of mass concentration portion is positioned on the vertical curve of drawing from the lowermost end of inclined wall 71a.In shown example, this recess is crooked smoothly, yet the left side of this inclined wall 71a and right side can be respectively smooth.Each unit is associated with the 28e of mass concentration portion along the mass of key setting.Base portion 71c can be fixed to keyframe 3.Perhaps, base portion 71c can be positioned on the keyframe 3 simply.

Shown in Fig. 8 B, when the 28e of mass concentration portion and lower limit retainer collided, collision load was applied on the particle by closure member 12.This collision load forces particle 11 motions, however the direction of motion of inclined wall 71a restriction particle 11.More particularly, when particle 11 collided with inclined wall 71a, inclined wall 71a produced opposite force to particle 11.Thus, particle 11 moves up along the surface of inclined wall 71a.Particle 11 is mobile as fluid.Inclined wall 71a and vertically the joint between the wall 71b be the top, its provide and closure member 12 between tight quarters.This top is used as barrier, and the feasible particle 11 that has moved up is difficult to clear the jumps and moves to adjacent area.

Shown in Fig. 8 C, when removing load, particle 11 since gravity and elastic-restoring force (if closure member 12 has applied any this power) move down to be returned to initial flat position along the surface of inclined wall 71 c.Thus, prevent that particle from moving and exceed the scope of key along the direction that is provided with of key.In other words, prevent that particle 11 motions from exceeding the scope of mass.Because constrained motion member 71 is designed so that the central authorities of the recess of inclined wall 71a coincide with the point that collides with mass, and be engaged to the midpoint of vertical wall 71b between the point of impingement of adjacent mass of inclined wall 71a, thereby the motion of particle can not hindered owing to the collision with mass.

As mentioned above, constrained motion member 71 is arranged in the space that is formed by keyframe 3 and closure member 12, and this space is used as " particle bag ".More particularly, inclined wall 71a and be used as constrained motion portion with the joint of vertical wall 71b moves along the direction that is provided with of key to prevent particle 11.In addition, when removing load, the inclined wall that forms recess helps the answer of the particle 11 that moves.Therefore, constrained motion member 71 makes " particle bag " keep damping performance for a long time.

Fig. 9 A and Fig. 9 B show the different instantiations of lower limit retainer shown in Figure 2.In these instantiations, the constrained motion member is arranged in the restraint member.In these two figure, with corresponding to the constrained motion member of a unit as example.In the instantiation shown in Fig. 9 A, constrained motion member 81 has horizontal part 81a, is positioned at the opening 81b of the central authorities of horizontal part 81a, vertical wall 81c and the base portion 81d of supporting horizontal part 81b.In this example, vertically wall 81c is used as constrained motion portion, to prevent to enter into particle 11 in the opening 81b lower zone along key motion.

In the example shown in Fig. 9 B, constrained motion member 82 have horizontal part 82a, (along key vertically) be arranged on recess 82b, vertical wall 82c and the base portion 82d of supporting horizontal part 82a on the front and rear of horizontal part 82a.In this example, vertically wall 82c is used as constrained motion portion to prevent entering into the regional interior particle 11 of recess 82b below along key motion.

Figure 10 A and Figure 10 B show other different instantiations of lower limit retainer shown in Figure 2.In these instantiations, the constrained motion member is arranged in the restraint member.In the example shown in Figure 10 A, constrained motion member 91 has the level cross-sectionn that is shaped as alphabetical H shape.The both sides that this constrained motion member 91 has the horizontal vertical wall 91a that forms alphabetical H and is connected to each vertical wall 91a are with the flange 91b of the vertical line that forms alphabetical H.In this example, vertically wall 91a is used as constrained motion portion to prevent that particle 11 is along key motion.Vertically wall 91a and flange 91b are regarded as a unit of constrained motion member 91.This constrained motion member 91 is arranged on by in the keyframe base plate 24 and closure member 12 complete area surrounded as base portion along the direction that is provided with of key.

Constrained motion member 91 can be fixed to as the keyframe base plate 24 of base portion or integrally formed with keyframe base plate 24.Perhaps, constrained motion member 91 can be positioned on the keyframe base plate 24 simply.In shown example, the dashed area of flange 91b is engaged to closure member 12 by combination, bonding (for example double sticky tape), welding, screw retention etc.Thereby, even under constrained motion member 91 is positioned over situation on the keyframe base plate 24 simply, also can make constrained motion member 91 fixing.In addition, because closure member 12 is fixed to constrained motion member 91, thereby closure member 12 is not easy to lose its cross sectional shape.

The inclined wall 92a of the constrained motion member 92 shown in Figure 10 B is similar to the inclined wall 71a shown in Fig. 8 A.Each inclined wall 92a also has level and smooth recess.Constrained motion member 92 has horizontal part 92b.Horizontal part 92b is connected to the top of inclined wall 92a to form constrained motion portion.Inclined wall 92a and be positioned at horizontal part 92b on the both sides of inclined wall 92a half be regarded as a unit of constrained motion member 92.Constrained motion member 92 is arranged in the interior zone that is surrounded by keyframe base plate 24 and closure member 12 as base portion along the direction that is provided with of key.Constrained motion member 92 can be fixed to the keyframe base plate 24 as base portion.Perhaps, constrained motion member 92 can be positioned on the keyframe base plate 24 simply.The dashed area of horizontal part 92b is engaged to closure member 12 by combination, bonding (for example double sticky tape), welding, screw retention etc.

In the explanation that reference Fig. 8 A to Fig. 8 C, Fig. 9 A, Fig. 9 B and Figure 10 A, Figure 10 B carry out, these examples are based on lower limit retainer shown in Fig. 2, that be provided for mass 28 pivots.And the lower limit retainer 5 of pivot shown in Figure 1A, that be provided for key also is similar.Yet the right side and the space between the left side of adjacent key are small.Therefore, the right side of adjacent key and left side, the right side (corresponding to the Reference numeral 1f among Fig. 1 C) of the left side of key (corresponding to the Reference numeral 1e among Fig. 1 C) and the key adjacent for example with the left side of this key, or the left side (corresponding to the Reference numeral 1e among Fig. 1 C) of the right side of key (corresponding to the Reference numeral 1f among Fig. 1 C) and the key adjacent with the right side of this key can be considered as being equal to a unit of the pivot member of the above-mentioned mass concentration 28e of portion.

Therefore, preferably constrained motion member 71,81,82 is arranged to make the constrained motion portion of constrained motion member 71,81,82 to be positioned at the midpoint (mid point between the left side 1e of key and the right side 1f of key) of each key.Because the constrained motion member 91 shown in Figure 10 A does not have direct correlation with the point of impingement, therefore as long as the constrained motion member is positioned at the midpoint between the adjacent mass 28 (28e of mass concentration portion), then constrained motion member 91 does not just need for each mid point between the adjacent mass 28 (28e of mass concentration portion) constrained motion portion to be set.Be not that mid point for all adjacent mass 28 is provided with constrained motion portion, more particularly, the constrained motion portion of constrained motion member 91 can be provided with the interval of expectation, to have the mid point of the portion of motion without limits.

Figure 11 A to Figure 11 D shows the instantiation of upper limit retainer shown in Figure 2.In these figure, the constrained motion member is arranged in the restraint member.Figure 11 A is the diagrammatic top view of key board unit.Figure 11 B is the stereographic map of upper limit retainer 30 when illustrating from beneath.Figure 11 C and Figure 11 D show the operation of upper limit retainer 30.In these figure, the parts similar with the parts that use among Figure 1A to Fig. 1 C and Fig. 2 adopt with Figure 1A to Fig. 1 C and Fig. 2 in the identical Reference numeral of Reference numeral represent.In Figure 11 A and Figure 11 B, omitted particle 11.

Shown in Figure 11 A, constrained motion member 101 has the level cross-sectionn of shape as alphabetical H shape, as the situation of the constrained motion member 91 of the lower limit retainer 29 shown in Fig. 1 0A.Constrained motion member 101 has vertical wall 101a and flange 101b.In this example, vertically wall 101a and gravity prevent that particle 11 is along key motion.Constrained motion member 101 is fixed to the bottom surface as the keyframe horizontal part 23a of base portion.Perhaps, constrained motion member 101 is integrally formed with keyframe horizontal part 23a.

In constrained motion member 101, shown in Figure 11 A, constrained motion portion is positioned at the some place that the 28e of mass concentration portion can not collide, and, is in the midpoint between the adjacent 28e of mass concentration portion that is.Shown in Figure 11 D, in original state, particle 11 is owing to gravity reduces.If it is few to be contained in the quantity of the particle 11 in the closed region, the below that then is used as the keyframe horizontal part 23a of ceiling produces space 102.

Shown in Figure 11 C, when the load that is produced by the collision of the 28e of mass concentration portion was applied to closure member 12, although gravity is arranged, particle 11 still upwards scattered, and jumps in the space 102.When scattering, vertically wall 101a causes particle 11 mainly along impact force direction (vertically making progress) motion, prevents that particle 11 is pressed through the space between closure member 12 and the vertical wall 101a and moves along the width of key direction.Shown in Figure 11 D, when removing the load that applies by the 28e of mass concentration portion when being back to original state, particle 11 since gravity reduce once more.

Because the vertical wall 101a of constrained motion member 101 is made of vertical plane, as mentioned above, when particle 11 move upward and when particle 11 owing to during the gravity reduction, prevented that particle 11 is along key motion.In addition, because vertical wall 101a, the frictional resistance of particle 11 is remained minimum.Thus, do not weaken response when the 28e of mass concentration portion collides and the response when removing to of load returns back to original state.

Figure 12 A to Figure 12 D shows the different instantiations of upper limit retainer shown in Figure 2.In these figure, the constrained motion member is arranged in the restraint member.These figure show a unit of constrained motion member respectively.Constrained motion member 111 shown in Figure 12 A is based on the constrained motion member 101 shown in Figure 11 A to Figure 11 D, yet, constrained motion member 111 has highly lower flange 111b and vertical wall 111a, this vertical wall 111a, be circular towards the end of closure member 12, so that make this vertical wall 111a consistent with the lateral section of closure member 12.

Constrained motion member 112 shown in Figure 12 B adopts the cylindrical shell with circular open 112a, and the vertical wall 112b of tubular is used as the wall member that near vertical ground is provided with.Constrained motion member 113 shown in Figure 12 C adopts the member of the Z-shaped horizontal section with upset (flipped).Constrained motion member 113 has towards the vertical wall 13a that the direction inclination is set of key and supports the flange 113b of the both sides of vertical wall 113a.Constrained motion member 114 shown in Figure 12 D adopts the member of the similar hollow saddleback of shape, and this saddleback has the surperficial 114b of slight inclination.The semicircle side that is positioned at the front and back of this saddleback is a pair of vertical wall 114a.

Constrained motion member 111 to 114 shown in Figure 12 A to Figure 12 D has vertical wall respectively.This vertical wall is used as the wall member that near vertical ground is provided with, and exceeds vertical wall to prevent particle 11 along key motion.Above-mentioned constrained motion member 111 to 114 is fixed to the keyframe horizontal part 23a as base portion.Perhaps, each constrained motion member 111 to 114 is integrally formed with keyframe horizontal part 23a.Constrained motion member 111 to 114 can partly be connected to unshowned closure member 12.

Figure 13 shows other different instantiations of upper limit retainer shown in Figure 2.In the figure, the constrained motion member is arranged in the restraint member.Figure 13 is for illustrating the stereographic map of upper limit retainer from the below.In the figure, parts similar with the parts that use among Figure 1A to Fig. 1 C and Fig. 2 adopt with Figure 1A to Fig. 1 C and Fig. 2 in the identical Reference numeral of Reference numeral represent.A plurality of constrained motion portion by connecting the constrained motion member 101 shown in Figure 1A to Figure 11 D to be obtaining the member of one, thereby forms constrained motion member 121.Constrained motion member 121 has vertical wall 121a and arc side plate 121b.This vertical wall 121a is used as constrained motion portion, and a plurality of points that are positioned at the arc-shaped depression portion below of side plate 121b vertically are respectively the points with the 28e of mass concentration portion collision.

Above-mentioned constrained motion member 121 is fixed to the keyframe horizontal part 23a as base portion.Perhaps, constrained motion member 121 is integrally formed with keyframe horizontal part 23a.Be fixed to as the substituting of the keyframe horizontal part 23a of base portion as closure member 12 that will sealing, the closure member 12 of sealing can be fixed to the side 121c of curved wall 121b, this side 121c be positioned at keyframe horizontal part 23a near.

As long as the constrained motion portion of above-mentioned constrained motion member is positioned at the midpoint between the 28e of mass concentration portion of adjacent mass 28, constrained motion portion just can be provided for the mid point between all adjacent mass concentration portions 28.Perhaps, constrained motion portion can be provided with the interval of expectation, to have the mid point of the portion of motion without limits.Above-mentioned constrained motion member is the upper limit retainer 30 that is provided for the 28e of mass concentration portion of mass 28, yet above-mentioned constrained motion member can be arranged for the upper limit retainer 6 of limit key motion.

Be at key board unit under the situation about leaning against on the wall or at key board unit longitudinally under the situation by bracket supports, although adopted the constrained motion member shown in Fig. 8 A to Fig. 8 C, Fig. 9 A, Fig. 9 B, Figure 10 A, Figure 10 B, Figure 11 A to Figure 11 D, Figure 12 A to Figure 12 D or Figure 13, the particle that is surrounded by closure member still can disperse along key.This dispersion may cause the player to pick out the variation of the key sense of touch between high key and the bass buttons, perhaps may lose the damping performance of expectation.

Therefore, in following instantiation, the restraint member is designed to have closed region separately, to stop particle 11 along key motion.In addition, no matter long-term use or against on the wall, these examples are designed to not only prevent that particle from moving to not desired region in operating process, and keep the performance of restraint member for a long time.

Figure 14 shows the instantiation of lower limit retainer shown in Figure 2.In Figure 14, at the outer setting retardation motion member of restraint member.In the figure, parts similar with the parts that use among Figure 1A to Fig. 1 C and Fig. 2 adopt with Figure 1A to Fig. 1 C and Fig. 2 in the identical Reference numeral of Reference numeral represent.In Figure 14, not shown particle 11.Retardation motion member 131 has the support 131b of arm 131a, supporting arm 131a and support 131b is fixed to the base portion 131c of keyframe base plate 24.By this retardation motion member 131, the joint 132 of " the particle bag " that is surrounded by closure member 12 and the belly 133 of " particle bag " are formed on the keyframe base plate 24.

Arm 131a is positioned at the outside of closure member 12, to be used as the retardation motion member of the external compression " particle bag 1 " from closure member 12.The closed region of the lower limit retainer 29 that arm 131a will be formed by " particle bag " is divided into a plurality of chambeies.Because particle 11 is limited in the closed region (chamber) separately, thereby has stoped particle 11 along key motion.Because above-mentioned joint 132 (gap) does not transmit damping performance, thereby joint 132 is arranged on the midpoint that need not damping between the adjacent 28e of mass concentration portion.The top of 28e of mass concentration portion and belly 133 (mid point between the gap) collides.

Figure 15 A and Figure 15 B show the instantiation of lower limit retainer shown in Figure 2.These illustrate the restraint member, and the closure member of these restraint members has sealing.At first, shown in Figure 15 A, closure member 141 is made shape as the bag shape.More particularly, the rectangle material that is the plane is folded into double-deck so that upper end 141a is overlapped on the relative lower end 141b, and they are bonded together to form tubulose closure member 141.Upper end 141a and lower end 141b can be bonded together by any means commonly used that is used to engage the apparent surface, described method for example for melted material, utilize adhesive bond, utilize linear slit together, clamp with clip etc.

Then, make the end sealing of tubulose closure member 141, simultaneously particle 11 is injected into the closure member 141 from the other end.Shown in Figure 15 B, will be divided into a plurality of chambeies by the closed region that closure member 141 surrounds particle 11 then.When separating, the particle 11 that is positioned at gap moves the upper and lower with the extruding closure member, thereby makes this two-layer stacked with the approximate straight line that forms.Afterwards, similar with engaging of described two ends (upper end 141a and lower end 141b), the overlapped layers of closure member 141 is engaged.Engaged approximate linear gap is smooth sealing 141c.Shown in Figure 15 B, sealing 141c along with form (perpendicular to the direction that is provided with of key) along the vertical direction of double-end line.

In order to form sealing 141c, preferably, before sealing engaged, towards the central axial direction tractive closure member 141 of set key and closure member 141 is assembled, the xsect of closed region enlarged thus, thereby allows to surround a large amount of particles 11.When forming sealing 141c at every turn, can finish particle 11 is injected bag shape closure members 141.

Figure 16 A to Figure 16 C shows the different instantiations with Figure 15 A and the tubulose closure member shown in Figure 15 B.Closure member 142 shown in Figure 16 A adopts two flat rectangular materials.The left end 142a of one piece material and right-hand member 142b are stacked in respectively on the left end 142c and right-hand member 142d of another sheet material, and described termination is closed.Described end adopts with the similar mode of example among Figure 15 A and Figure 15 B and engages.In the closure member shown in Figure 16 B 143, the rotation planarization material to be being stacked in inner 143a on the 143b of outer end, and they are bonded together.Figure 16 C adopts tubular body 144.The example of tubular body 144 comprises the injection mo(u)lding film of the flat fabric, circulation woven product and the tubulose that form sack.Equally, in these examples shown in Figure 16 A to Figure 16 C, similar mode forms in the example of the approximate sealing employing that forms and Figure 15 A and Figure 15 B linearly on gap.

Figure 17 A to Figure 17 E shows a kind of key board unit, and this key board unit adopts the tubulose closure member with the approximate linear sealing shown in Figure 15 A and Figure 15 B.Explanation to the key board unit shown in Figure 17 A to Figure 17 E will be based on the structure shown in Fig. 2.With the similar parts of the parts that adopt among Fig. 2 use with Fig. 2 in the identical Reference numeral of Reference numeral represent.Figure 17 A schematically shows the right view of the key board unit of electronic musical instrument.Figure 17 B to Figure 17 E shows the operation of upper limit retainer.

Lower limit retainer 151 shown in Figure 17 A and upper limit retainer 152 limit the action of mass 28 respectively.Lower limit retainer 151 and upper limit retainer 152 are restraint members, and this restraint member adopts the closure member 141 that has with reference to the approximate linear sealing 141c of Figure 15 A and Figure 15 B description.The lower limit retainer 153 and the lower limit retainer unshowned, that limit the action of black key main body 22 that limit the action of white key main body 21 can adopt similar restraint member respectively.These retainers are arranged to make them to have horizontal impingement area.Each restraint member is fixed.Perhaps, sealing 141c is by the member supporting of all 131c of arm as shown in Figure 14 and so on, and corresponding thus restraint member keeps its original shape.

Shown in Figure 17 B, the collision load that the acceptance of the bottom surface of the belly of closure member 141 is applied by the 28e of mass concentration portion.The restraint member is arranged on the horizontal part 23a of keyframe, almost is parallel to approximate linear sealing 141c so that the bottom surface of this belly becomes.Similarly, the lower limit retainer 153 that is used for key is arranged to make the end face of the belly of accepting collision load to become almost to be parallel to approximate linear sealing 141c.This set allows the mass concentration 28e of portion to collide with closure member 141 with the angle perpendicular to sealing 141c almost, applying collision load, thereby causes the impingement area of closure member 141 to become near flat reposefully.Therefore, although closure member 141 has sealing 141c, closure member 141 also can be out of shape reposefully as the sealing 141c of joint and between as the impact portions of belly, thereby normally transmits damping performance.

Shown in Figure 17 C, can adopt the closure member 154 of the closure member 141 that comes from shown in Figure 15 A.More particularly, form closure member 154 by the end face and the bottom surface of opening closure member 141, thereby provide such closure member 154: along smooth perpendicular to the direction of stacked end, and linear sealing 154c is approximately perpendicular to the line of being drawn by the end.And in this example, the restraint member is arranged on the horizontal part 23a of keyframe, and the bottom surface of belly becomes and almost is parallel to approximate linear sealing 154c thus.When applying collision load, the impingement area of closure member 154 becomes near flat reposefully, thereby has guaranteed normal damping performance for this instantiation.

Shown in Figure 17 D of example as a comparison, suppose that upper limit retainer 152 is arranged to make the end face of closure member 141 and bottom surface and sealing 141c approx perpendicular to horizontal part 23a.When collision load being applied on the upper limit retainer 152, shown in Figure 17 E, closure member 141 is pushed downwards, is the plane thereby have along the xsect perpendicular to the horizontal direction that is similar to linear sealing 141c.Yet sealing 141c can keep vertically being approximate linear shape as possible, thereby causes sealing 141c perpendicular to impingement area.Thus, this collision causes that closure member 141 produces gross distortion between the impact portions (belly) of this closure member 141 and sealing 141c (joint).Therefore, this set has not only hindered damping stably but also to producing bad influence by sense of touch that the player perceived, thereby has reduced the durability of closure member 141.

The above-mentioned behavior of upper limit retainer 152 can be applied to lower limit retainer 151,153 similarly.In addition, the behavior of upper limit retainer 152 can be applied to this situation similarly, promptly, restraint member with closure member 141 of describing with reference to Figure 15 A, Figure 15 B is applied to be used for the lower limit retainer 5 and the upper limit retainer 6 of the pivot of key, and described lower limit retainer 5 and upper limit retainer 6 are applied to the key board unit shown in Figure 1A to Fig. 1 C.

Figure 18 shows different instantiations, and this example illustrates sealing and is formed on the tubulose closure member shown in Figure 15 A and Figure 15 B.Utilize extruded member 162 at sealing 161a place extruding closure member 161.To the material of closure member 161 without limits, can use the closure member shown in Fig. 3 A to Fig. 3 C thus.In this instantiation, form sealing 161a by utilizing extruded member 162 extruding closure members 161, sealing 161a is approximate point-like thus.

Extruded member 162 can be rubber, line or rope.Closure member 161 utilizes line or rope to wrap up, utilize rubber to fix or utilizes sewer to form sealing 161a.Perhaps, can compress closure member 161 to utilize becket with becket as extruded member 162.In addition, under the situation of not using extruded member 162, can self form sealing 161a by reversing closure member 161.

Compare with the approximate linear sealing 141c shown in Figure 15 B with Figure 15 A, thereby be easier with the combination that has the sealing 161a that is approximate point-like and form the restraint member by crush seal member 161.In addition, closure member 161 has xsect and is approximately circular inner sealing zone, can hold a large amount of particles 11.In addition, described as reference Figure 17 A to Figure 17 E, approximate linear sealing 141c has the problem (anisotropy of angle) of the collision angle that mass or key and closure member 141 collide, yet, even mass or key collide with the belly of closure member 161 at any angle, the sealing 161a that shape is approximate point-like can not apply any influence.

In Figure 14, Figure 15 A, Figure 15 B, Figure 16 A to Figure 16 C, Figure 17 A to Figure 17 E and Figure 18, sealing is arranged on the closure member the closed region is divided into a plurality of closed regions, stops particle along key motion thus.Sealing is arranged on key or each midpoint of asking of a plurality of points of bumping with the mass (pivot member) of key pivot in unison.More particularly, for mass, each midpoint between the adjacent mass all has sealing.For key, sealing is arranged on the midpoint of each key.

Yet sealing can be arranged on each midpoint.In addition, each closed region that is separated by sealing all can comprise the constrained motion member shown in Fig. 8 A to Fig. 8 C, Fig. 9 A, Fig. 9 B, Figure 10 A, Figure 10 B, Figure 11 A to Figure 11 D, Figure 12 A to Figure 12 D and Figure 13.Figure 19 A to Figure 19 B that the instantiation of lower limit retainer shown in Figure 2 is shown is the schematic plan that the layout that is formed at the sealing on the closure member is shown.As for the lower limit retainer, Figure 19 A and Figure 19 B are to have the restraint member of the closure member shown in Figure 15 A and Figure 15 B.In Figure 19 A and Figure 19 B, with the similar parts of the parts that use among Fig. 2 adopt with Fig. 2 in the identical Reference numeral of Reference numeral represent, and omit detailed description.

On the restraint member 171 shown in Figure 19 A, gap each midpoint between the adjacent 28e of mass concentration portion that forms by sealing 171a.On the restraint member 172 shown in Figure 19 B, three adjacent 28e of mass concentration portion are regarded as one group, to utilize this group with restraint member 172 separately.On restraint member 172, the gap 172a that is formed by sealing is arranged on the midpoint between the adjacent group.More particularly, be considered as one group the shared closed region of the 28e of mass concentration portion.Thus, can simplify the structure and the making of sealing 172.Usually, each group has the 28e of mass concentration portion of equal number, yet group can be different with the quantity of the 28e of mass concentration portion between organizing.

In the instantiation that reference Figure 15 A, Figure 15 B, Figure 16 A to Figure 16 C, Figure 1A to Figure 17 E and Figure 18 describe, the tubulose containment member all has sealing.But, do not have at the restraint member under the situation of the sealing shown in Figure 1A to Fig. 1 C, Fig. 2, Fig. 3 A to Fig. 3 C, Fig. 4 A to Fig. 4 E, Fig. 5, Fig. 6, Fig. 7 A, Fig. 7 B, Fig. 8 A to Fig. 8 C, Fig. 9 A, Fig. 9 B, Figure 10 A, Figure 10 B, Figure 11 A to Figure 11 D, Figure 12 A to Figure 12 D, Figure 13 and Figure 14 (closure member is fixed to base portion to seal in these figure), can adopt the tubulose closure member.Because the processing to particle helps to simplify equipment, thereby preferably, before closure member is fixed to keyframe particle is inserted closure member.

In this manual, upper limit retainer and lower limit retainer (restraint member) are positioned on the typical position, yet, upper limit retainer and lower limit retainer can be positioned on any position that is different from shown position, if retainer can carry out be used for key or with the restraint performance of the mass (pivot member) of key pivot in unison.More particularly, upper limit retainer and lower limit retainer (restraint member) needn't be arranged on keyframe from one's body, but as long as retainer is arranged on the side of stationary pivot member, then retainer can be arranged on any position.More particularly, retainer can be arranged on any desired fixed component on the keyframe side.

Claims (17)

1. the key board unit of an electronic musical instrument comprises:

A plurality of pivot members, each described pivot member all respond pushing of key or discharge and pivot;

Framework, it supports described pivot member, so that described pivot member can pivot; And

The restraint member, it is provided with direction in the frame side setting along described pivot member, described restraint member and described pivot member produce collision, with the scope that restriction allows described pivot member to pivot, described pivot member is at least a in described key and the mass member that synchronously pivots with pushing of described key; Wherein:

This restraint member comprises and holds the closure member that a plurality of particles allow air to flow into simultaneously and flow out, wherein this closure member is made by the thin flexible material that has pore, and the size of described pore is less than the size of the minimum cross-section that is enclosed in each the described particle in this closure member;

Contact site when described restraint member and the collision of described pivot member is on this closure member.

2. the key board unit of electronic musical instrument as claimed in claim 1, wherein:

This closure member is fixed to a ventilative base portion.

3. as the key board unit of any described electronic musical instrument in the claim 1 to 2, wherein:

Described contact site is in the below that this restraint member is fixed to the position of this frame side.

4. as the key board unit of any described electronic musical instrument in the claim 1 to 2, also comprise:

Elasticity restraint member, it is used to apply the bigger repulsive force of repulsive force that is applied than this restraint member; Wherein:

This restraint member and this elasticity restraint member are positioned on this framework or are positioned on the fixed component that is in this frame side, thus when described pivot member pivot, described pivot member with this restraint member impacts before collide with this elasticity restraint member.

5. key board unit as claimed in claim 1, wherein:

The space that is surrounded by this closure member is provided with the constrained motion member that is used to limit described movement of particles.

6. the key board unit of electronic musical instrument as claimed in claim 5, wherein:

This constrained motion member is arranged to make constrained motion portion to be positioned at least a portion position as a plurality of positions of the mid point between the adjacent contact site.

7. the key board unit of electronic musical instrument as claimed in claim 5, wherein:

This constrained motion member is arranged to make in a plurality of constrained motion portion each all in each position as the mid point between the adjacent contact site; And

This constrained motion member has a plurality of inclined walls, and the least significant end of described inclined wall is the contact site that collides with described pivot member, and the most significant end of described inclined wall is the position that described constrained motion portion is set.

8. the key board unit of electronic musical instrument as claimed in claim 5, wherein:

This constrained motion member is the wall member that near vertical ground is provided with.

9. as the key board unit of any described electronic musical instrument in the claim 6 to 8, wherein:

This constrained motion member partly engages with this closure member.

10. the key board unit of electronic musical instrument as claimed in claim 1, wherein:

On this closure member, form a plurality of sealings in the direction that is provided with along described pivot member.

11. the key board unit of electronic musical instrument as claimed in claim 10, wherein:

This closure member forms tubulose along the direction that is provided with of key.

12. the key board unit of electronic musical instrument as claimed in claim 11, wherein:

This closure member forms in the following manner,, a rectangle plane material is folded into bilayer that is, and the end with this rectangle plane material engages to form tubulose then.

13. as the key board unit of claim 11 or 12 described electronic musical instruments, wherein:

Described sealing forms in the following manner, that is, along partly pushing this closure member with the approximately perpendicular direction of direction that is provided with of described pivot member, stacked then for two-layer and make this two-layer joint with the approximate straight line that forms; And

This constrained motion member is arranged on this frame side, and described thus pivot member collides with a plurality of contact sites that are positioned on this closure member with the angle approximately perpendicular to described sealing.

14. as the key board unit of any described electronic musical instrument in the claim 10 to 12, wherein:

Described sealing forms by pushing this closure member, so that described sealing is approximate point-like.

15. as the key board unit of any described electronic musical instrument in the claim 10 to 12, wherein:

Described sealing is arranged at least a portion position as a plurality of positions of the mid point between the adjacent contact site.

16. the key board unit of electronic musical instrument as claimed in claim 13, wherein:

Described sealing is arranged at least a portion position as a plurality of positions of the mid point between the adjacent contact site.

17. the key board unit of electronic musical instrument as claimed in claim 14, wherein:

Described sealing is arranged at least a portion position as a plurality of positions of the mid point between the adjacent contact site.

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