JP7052234B2 - Pressure detector and electronic percussion instrument - Google Patents

Description

The present invention relates to a pressure detecting device and an electronic percussion instrument used for, for example, an electronic drum and the like to detect a pressing force generated by a striking operation (pad operation).

Conventionally, an electronic percussion instrument having a plurality of pads and producing sounds of various percussion instruments such as drum sounds and percussion sounds by hitting each of these pads by hand or with a stick has been known. In electronic percussion instruments, a percussion instrument with a tone color corresponding to the type of pad on which the pad operation is performed, based on the output of a sensor that detects a striking operation (hereinafter referred to as pad operation) in which the performer hits the pad surface with a hand or stick. It is configured to generate sound.

As a sensor for detecting pad operation, for example, in Patent Document 1, a hitting body having a conductive film formed on the back surface of an elastic pad member and a plurality of conductive regions non-conducting to each other are concentrically formed on the surface of an insulating substrate. A base member formed in the above and a spacer made of a sheet or a net having an opening formed in a mesh shape are provided, and the impacted body and the base member are arranged to face each other via the spacer, and the impacted body is conductive by pad operation. A technique for detecting the hitting point position where the pad operation is performed by contacting and conducting the property film to any of the conductive regions in the base member is disclosed.

In addition, as a pressure sensor (pressure detection device) applied to an electronic percussion instrument, a pressure sensor (pressure detection device) using a pressure-sensitive resistance sheet whose contact resistance value continuously changes according to a pressing force is also known. This type of pressure sensor (pressure detection device) will be described with reference to FIG. FIG. 8A is a cross-sectional view showing a structural example of a pressure sensor using a pressure sensitive resistance sheet. In this figure, the carbon printed circuit board 20 includes a carbon pattern layer 22 in which pressure-sensitive ink is screen-printed on the insulating substrate 21.

A carbon sheet 24 is provided on the upper surface side of the carbon pattern layer 22 that functions as a lower electrode via an electrically insulating non-conductor spacer 23. The carbon sheet 24 functions as an upper electrode. The pad 25 is formed of, for example, a rectangular parallelepiped (plate-shaped) elastic resin material, has a striking surface D on the upper surface thereof on which the pad is operated, and the back surface side facing the striking surface D is placed on the carbon sheet 24. Will be done. The pad 25 is slidably held in the vertical direction by a member (not shown).

According to the above structure, the contact resistance value between the carbon sheet 24 as the upper electrode and the carbon pattern layer 22 as the lower electrode changes according to the pressing force applied to the striking surface D of the pad 25 by the pad operation. Pressure is detected by measuring this change in contact resistance value as an output voltage.

Japanese Unexamined Patent Publication No. 2005-234400

By the way, in the pressure sensor (pressure detection device) having the structure shown in FIG. 8A, the degree of adhesion between the upper and lower electrodes corresponding to the pressing force applied to the striking surface D of the pad 25 by the pad operation and the contact between the upper and lower electrodes. The contact resistance value is determined by the area. That is, when such a change in the contact resistance value is measured as an output voltage V, the output voltage V is represented by the characteristics of the pressing force per unit area (the degree of adhesion between the upper and lower electrodes) and the contact area of the upper and lower electrodes.

For example, as shown in FIG. 8B, when the striking surface D of the pad 25 is pressed within the range of the pressing force 0 to the pressing force F1, which is a relatively weak pressing force, the back surface of the pad 25 is pressed with the upper electrode (carbon). The sheet 24) is pushed in, and the degree of adhesion (contact resistance per unit area) between the upper electrode (carbon sheet 24) and the lower electrode (carbon pattern layer 22) bent by this is greatly changed according to the pressing force.

Further, as shown in FIG. 8C, when the striking surface D of the pad 25 is pressed within the range of the pressing force F1 to the pressing force F2, which is a relatively strong pressing force, the back surface of the pad 25 becomes the upper electrode ( The carbon sheet 24) is further pushed from the state shown in FIG. 8 (b), but since the degree of adhesion (contact resistance per unit area) has already increased and is approaching the saturated state, the adhesion according to the pressing force is reached. The change in degree (contact resistance per unit area) is small.

On the other hand, regarding the contact area, since the back surface of the pad 25 is formed on a flat surface, as shown in FIGS. 8 (b) and 8 (c), the upper electrode (carbon sheet 24) and the lower portion are formed regardless of the strength of the pressing force. The contact area with the electrode (carbon pattern layer 22) is substantially the same, that is, the contact area is constant.

Regarding the relationship between the pressing force of the pressure sensor (pressure detector) and the output voltage, if the contact area is constant regardless of the strength of the pressing force, the contact resistance will change depending on the degree of adhesion. As shown in FIG. (D), as soon as the upper electrode (carbon sheet 24) and the lower electrode (carbon pattern layer 22) come into contact with each other, the contact resistance value drops and the output voltage V rises sharply, and thereafter. The output voltage V gradually increases in proportion to the contact resistance value that decreases as the degree of adhesion between the upper and lower electrodes increases according to the pressing force F.

With such characteristics, for example, as shown in FIG. 3D, the striking surface D of the pad 25 is changed from a pressing pressure of 0 (excluding the non-responsive region), which is a relatively weak pressing force, to a pressing force F1. A sufficient dynamic range can be secured between the output voltage 0 and the output voltage V1, which is a change in the output voltage in the case of the above case, but the pressing force F1 which is a relatively strong pressing force on the striking surface D of the pad 25. It is not possible to secure a sufficient dynamic range between the output voltage V1 and the output voltage V2, which is the change in the output voltage when the pressure is changed from to the pressing force F2.

That is, the balance of the dynamic range between the operating region of the weak pressing force and the operating region of the strong pressing force is poor, and the overall dynamic range is not sufficiently secured. In addition, there is also a problem that the balance of the dynamic range is poor and the operability (resolution of the pressing force) is lowered because a sufficient dynamic range cannot be secured as a whole.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pressure detecting device and an electronic percussion instrument capable of improving the dynamic range and improving the operability.

The pressure detecting device according to an embodiment of the present invention has a pressure-sensitive portion that generates an output corresponding to at least the contact area to which the pressing force is applied, and an operating surface, and when the pressing force is applied to the operating surface. A member provided so that the facing surface facing the operation surface comes into contact with the pressure-sensitive portion and elastically deforms, and the facing surface feels the same due to the elastic deformation according to the pressing force on the operation surface. The pressure-sensitive portion includes an elastic member whose contact area for applying a pressing force to the pressure-sensitive portion changes, and the pressure-sensitive portion has a pressing force per unit area with respect to the pressure-sensitive portion and a contact in which the pressing force is applied to the pressure-sensitive portion. An output corresponding to the area is generated, and the pressure-sensitive portion and the elastic member have an output due to a change in the pressing force per unit area with respect to the pressure-sensitive portion as the pressing force on the operation surface increases. It is characterized in that the change in output due to the change in the contact area where the pressing force is applied to the pressure-sensitive portion is larger than the change .

In the present invention, the dynamic range can be improved to improve the operability.

FIG. 1 is a block diagram showing a configuration of an electronic percussion instrument 100 according to an embodiment of the present invention. FIG. 2A is a cross-sectional view showing the structure of the pressure detection unit 10, and FIG. 2B is a diagram showing an example of a carbon pattern. FIG. 3 is a diagram for explaining the function of the pressure detecting unit 10. FIG. 4 is a diagram for explaining the structure of the pressure detecting unit 10 according to the first modification. FIG. 5 is a diagram for explaining the structure of the pressure detecting unit 10 according to the second modification. FIG. 6 is a diagram for explaining the structure of the pressure detecting unit 10 according to the third modification. FIG. 7 is a diagram showing an example of a conductive pattern due to a non-uniform density distribution. FIG. 8 is a diagram for explaining a conventional example.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Structure of Embodiment]
FIG. 1 is a block diagram showing a configuration of an electronic percussion instrument 100 according to an embodiment of the present invention. In FIG. 1, the pressure detection unit 10 is configured by a method using a pressure-sensitive resistance sheet whose contact resistance value continuously changes according to a pressing force, as in the conventional example shown in FIG. 8, and is generated by pad operation. Generates a voltage signal according to the pressing force. The structure of the pressure detection unit 10 according to the gist of the present invention will be described in detail later.

The ADC 11 AD-converts the voltage signal generated by the pressure detection unit 10 and outputs the pad data PD. The CPU 12 sets the operation mode of each musical instrument based on various switch events supplied from the operation unit 15, and also notes on including a sounding instruction and a sounding volume (velocity Vel) according to the pad data PD output from the ADC 11. An event and a note-off event instructing mute are generated and supplied to the sound source 16.

The ROM 13 stores various control programs loaded into the CPU 12. The RAM 14 is used as the work area of the CPU 12, and temporarily stores various register flag data. The operation unit 15 has, for example, a power switch (not shown) for powering on / off the power of the device, a tone selection switch for selecting the tone of the percussion instrument to be generated, and the like, and generates a switch event corresponding to various switch operations. ..

The sound source 16 is configured by a known waveform memory reading method, and includes a plurality of sounding channels that operate in a time-division manner. The sound source 16 stores waveform data of various hitting instrument sounds, reads out waveform data of hitting instrument sounds preset according to a note-on event supplied from the CPU 12, and notes-on the waveform data of the read hitting instrument sounds. The reproduced waveform data obtained by controlling the volume based on the velocity Vel included in the event is output. The sound system 17 D / A-converts the reproduced waveform data output from the sound source 16 into an analog-format reproduced waveform signal, performs filtering such as removing unnecessary noise from the reproduced waveform signal, and then amplifies the signal. Sound is emitted from the speaker.

[Structure of pressure detection unit 10]
Next, the structure of the pressure detection unit 10 will be described with reference to FIG. FIG. 2A is a cross-sectional view showing an example of the structure of the pressure detection unit 10. In this figure, the carbon printed circuit board 101 includes a carbon pattern layer 101b in which pressure-sensitive ink is screen-printed on the insulating substrate 101a. The carbon pattern layer 101b that functions as a lower electrode includes a plurality of rectangular conductive patterns.

As shown in FIG. 2B, the plurality of conductive patterns have a pattern in which the spacing between the conductive patterns is widened at the central portion to make the pattern density “sparse” and the spacing between the conductive patterns is narrowed at the outer edge (outer peripheral) portion. It has a non-uniform density distribution with a "dense" density. A carbon sheet 103 is provided on the upper surface side of the carbon pattern layer 101b that functions as a lower electrode via an electrically insulating non-conductor spacer 102. The carbon sheet 103 functions as an upper electrode.

The pad 104 is formed of an elastically deformable disk-shaped resin material such as silicon resin. The shape of the pad 104 is not limited to a disk shape, but may be a rectangular parallelepiped (plate shape). A striking surface D on which the pad is operated is provided on the upper surface of the pad 104. The back surface side of the pad 104 facing the striking surface D forms a curved surface around the outer edge with a predetermined curvature, and the flat surface on the back surface side connected to the curved surface is placed on the carbon sheet 103. The pad 104 is slidably held in the vertical direction by a member (not shown).

According to such a structure, for example, as shown in FIG. 3A, when the striking surface D of the pad 104 is pressed with a weak pressing force F1, the back surface of the pad 104 is the upper electrode (carbon sheet 103). Is pushed in, thereby contacting the lower electrode (carbon pattern layer 101b) in the region where the density of laying the conductive pattern is "sparse". In this case, the upper electrode (carbon sheet 103) comes into contact with the carbon pattern layer 101b in the region where the pattern density is “sparse”.

On the other hand, for example, as shown in FIG. 3B, when the striking surface D of the pad 104 is pressed with a pressing force F2 stronger than the weak pressing force F1, the curved surface formed on the outer edge of the back surface of the pad 104 is elastic. It bends due to deformation. That is, it can be seen that the area (contact area) of the back surface of the pad 104 increases because the outer edge of the back surface of the pad 104 is crushed by the strong pressing force F2 and the contact area becomes larger than the contact area shown in FIG. .. Then, as the area (contact area) of the back surface of the pad 104 increases, the upper electrode (carbon sheet 103) mainly comes into contact with the carbon pattern layer 101b in the region where the pattern density is "dense".

Therefore, as shown in FIG. 3C, when the striking surface D of the pad 104 is pressed with a weak pressing force F1 (see FIG. 3A), the pattern density is mainly in the “sparse” region. Since the upper electrode (carbon sheet 103) is in contact with the carbon pattern layer 101b of the above, a relatively large contact resistance value is obtained, and as a result, the output voltage is V1.

On the other hand, when the striking surface D of the pad 104 is pressed with a pressing force F2 stronger than the weak pressing force F1 (see FIG. 3B), the outer edge of the back surface of the pad 104 is crushed by elastic deformation and the contact area increases. Moreover, since it comes into contact with the carbon pattern layer 101b in the region where the pattern density is mainly "dense", the contact resistance value becomes small, and as a result, the output voltage V2 is obtained.

That is, as the pressing force increases, the curved surface formed on the outer edge of the back surface of the pad 104 collapses to increase the contact area between the upper and lower electrodes, while the lower electrode (carbon pattern layer) with which the upper electrode (carbon sheet 103) contacts. Since the pattern density of 101b) changes from "sparse" to "dense", the contact resistance value does not drop as soon as both electrodes come into contact, and the output voltage does not rise sharply as in the past. As a result of the contact resistance value between both electrodes changing in a form substantially proportional to the pressing force applied to the striking surface D of 104, the output voltage V becomes a "pressing pressure-output voltage" characteristic in which the output voltage V gradually increases.

In these characteristics, as shown in FIG. 3C, the difference between the output voltage V1 when the striking surface D of the pad 104 is pressed with a weak pressing force F1 and the output voltage V2 when the striking surface D of the pad 104 is pressed with a strong pressing force F2. Since ΔV2 is larger than the difference ΔV1 (see FIG. 8D) in the conventional example, it is possible to improve the dynamic range and improve the resolution related to operability.

[Modification example]
Next, a modification will be described. In the above-described embodiment, the curved surface formed on the outer edge of the back surface of the pad 104 is crushed to increase the contact area of the upper and lower electrodes, while the pattern density of the lower electrode (carbon pattern layer 101b) with which the upper electrode (carbon sheet 103) is in contact is increased. By changing from "sparse" to "dense", the dynamic range was improved and the resolution related to operability was improved, but in the modified example, the characteristics of "pressing pressure-output voltage" are arbitrarily changed for operation. The structure of the pressure detection unit 10 with improved properties will be described.

(1) First Modified Example FIG. 4 is a diagram for explaining the structure of the pressure detecting unit 10 according to the first modified example. In this figure, the components common to the above-described embodiments are designated by the same numbers, and the description thereof will be omitted. The first modification shown in FIG. 4A differs from the embodiment shown in FIG. 2A in that a bottom curved surface having a predetermined curvature is provided on the back surface of the pad 104 and a lower electrode is provided. A sparse pattern and a dense pattern are laid on (carbon pattern layer 101b) at a predetermined pitch.

According to the above structure, when the striking surface D of the pad 104 is pressed, the bottom curved surface provided on the back surface of the pad 104 first brings the upper and lower electrodes into contact with each other. At this time, the contact area is small, and the upper electrode (carbon sheet 103) comes into contact with the sparse pattern of the lower electrode (carbon pattern layer 101b), resulting in a large contact resistance value. Then, when the pressing force is gradually increased, the curved surface at the bottom is crushed and the back surface of the pad 104 becomes flat, the contact area increases, and the contact resistance value begins to decrease. If the pressing force is further increased, the curved surface formed on the outer edge of the back surface of the pad 104 is crushed, the contact area of the upper and lower electrodes is maximized, and the contact resistance value is also minimized.

As a result, as shown in the figure (b), the characteristics of "pressing pressure-output voltage" gradually increase the output voltage V (contact resistance value gradually decreases) until a predetermined pressing force is applied. ), And when the pressing force exceeds a predetermined value, the output voltage V sharply increases (the contact resistance value sharply decreases). Such a characteristic is useful as a characteristic for eliminating the pad operation when the striking surface D of the pad 104 is weakly hit as a performance error, or for inputting a percussion instrument sound such as a Japanese drum.

(2) Second Modified Example FIG. 5 is a diagram for explaining the structure of the pressure detecting unit 10 according to the second modified example. In this figure, the same numbers are assigned to the elements common to the above-described embodiments, and the description thereof will be omitted. The second modification shown in FIG. 5A differs from the embodiment shown in FIG. 2A in that the back surface of the pad 104 is formed into a curved surface having a predetermined curvature.

According to the above structure, when the striking surface D of the pad 104 is pressed, the curved surface of the back surface of the pad 104 first brings the upper and lower electrodes into contact with each other. At this time, the contact area is small, and the upper electrode (carbon sheet 103) comes into contact with the sparse pattern of the lower electrode (carbon pattern layer 101b), resulting in a large contact resistance value. Then, when the pressing force is gradually increased, the curved surface is crushed and the back surface of the pad 104 becomes flat, the contact area increases, and the contact resistance value begins to decrease. If the pressing force is further increased, the curved surface on the back surface of the pad 104 is crushed, the contact area between the upper and lower electrodes is maximized, and the contact resistance value is also minimized. As a result, the characteristic of "pressing pressure-output voltage" becomes a characteristic that the output voltage V increases substantially linearly according to the pressing force F, as shown in FIG. Such a characteristic is useful as a characteristic for inputting, for example, a snare drum sound that weakly or strongly hits the striking surface D of the pad 104.

(3) Third Modified Example FIG. 6 is a diagram for explaining the structure of the pressure detecting unit 10 according to the third modified example. In this figure, the same numbers are assigned to the elements common to the above-described embodiments, and the description thereof will be omitted. The third modification shown in FIG. 6A differs from the embodiment shown in FIG. 2A in that the back surface of the pad 104 has a predetermined curvature as shown in FIG. 6B. It is at the point where a plurality of convex portions forming an envelope surface are arranged in a matrix.

According to such a structure, as in the above-described embodiment, as the pressing force becomes stronger, the plurality of convex portions formed on the back surface of the pad 104 are crushed to increase the contact area of the upper and lower electrodes, while the upper electrode ( Since the pattern density of the lower electrode (carbon pattern layer 101b) with which the carbon sheet 103) contacts changes from "sparse" to "dense", the contact resistance value drops as soon as both electrodes come into contact with each other, as in the conventional case. The output voltage does not rise sharply, and the contact resistance value between both electrodes changes in a form that is almost proportional to the pressing force applied to the striking surface D of the pad 104, resulting in a gentle increase in the output voltage V. It has the "pressure-output voltage" characteristic.

As described above, in the present embodiment, as the pressing force applied to the striking surface D of the pad 104 becomes stronger, the curved surface formed on the outer edge of the back surface of the pad 104 is crushed by elastic deformation, so that the contact area between the upper and lower electrodes is increased. The pattern density of the lower electrode (carbon pattern layer 101b) with which the upper electrode (carbon sheet 103) contacts changes from "sparse" to "dense".

That is, the contact resistance value is generated based on the predetermined characteristics corresponding to the pressing force applied to the striking surface D of the pad 104 and the area of the back surface of the pad 104 that changes due to the elastic deformation due to the pressing force. In addition, the contact resistance value does not drop as soon as the upper electrode (carbon sheet 103) and the lower electrode (carbon pattern layer 101b) come into contact with each other, and the output voltage does not rise sharply. As a result of the contact resistance value between both electrodes changing in a form substantially proportional to the applied pressing force, it becomes possible to improve the dynamic range and improve the resolution related to operability.

Further, while forming a bottom curved surface having a predetermined curvature protruding downward on the back surface of the pad 104, a curved surface having a predetermined curvature, or forming a plurality of convex portions forming an envelope surface having a predetermined curvature, the upper electrode (carbon). By changing the pattern density of the lower electrode (carbon pattern layer 101b) with which the sheet 103) comes into contact, the characteristics of "pressing pressure-output voltage" can be arbitrarily changed to improve operability. Become.

In the above-described embodiment, in the carbon pattern layer 101b that functions as the lower electrode, the density of laying the conductive pattern is made uneven by dividing it into a "sparse" region and a "dense" region. Not limited to this, for example, as in the example shown in FIG. 7, the density at which the conductive pattern is laid may be continuously changed from “sparse” to “dense”.

Although the embodiments (including modifications) of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be variously modified at the implementation stage without departing from the gist thereof. be. In addition, the functions executed in the above-described embodiment may be combined as appropriate as possible. The embodiments described above include various stages, and various inventions can be extracted by an appropriate combination according to a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the effect is obtained, the configuration in which the constituent elements are deleted can be extracted as an invention.

Hereinafter, each invention described in the claims at the time of filing the application of the present application will be described.
(Additional note)
[Claim 1]
A pressure-sensitive part that generates an output corresponding to at least the contact area to which the pressing force is applied,
A member having an operation surface and provided so that when a pressing force is applied to the operation surface, the facing surface facing the operation surface comes into contact with the pressure-sensitive portion and elastically deforms. An elastic member whose contact area where the facing surface applies pressing force to the pressure-sensitive portion changes due to elastic deformation according to the pressing force on the operation surface.
A pressure detector characterized by comprising.
[Claim 2]
The pressure detecting device according to claim 1, wherein the elastic member has a non-uniform shape on the back surface when no pressing force is applied to the operation surface.
[Claim 3]
The pressure-sensitive portion generates an output corresponding to the pressing force per unit area with respect to the pressure-sensitive portion and the contact area to which the pressing force is applied to the pressure-sensitive portion.
The pressure-sensitive portion and the elastic member refer to the pressure-sensitive portion as the pressing force on the operation surface increases, rather than the change in output due to the change in pressing pressure per unit area with respect to the pressure-sensitive portion. The pressure detection device according to claim 1 or 2, wherein the change in output due to the change in the contact area to which the pressing force is applied is provided so as to be larger.
[Claim 4]
In the pressure-sensitive portion, the rate of change in output with respect to the change in the contact area where the pressing force is applied to the pressure-sensitive portion differs depending on the region where the pressing force is applied to the pressure-sensitive portion.
In the pressure-sensitive portion and the elastic member, the larger the pressing force on the operation surface, the larger the ratio of the change in output to the change in the contact area where the pressing force is applied to the pressure-sensitive portion is larger. The pressure detecting device according to claim 3, wherein the pressure detecting device is provided so that the contact area is large.
[Claim 5]
The elastic member according to any one of claims 1 to 4, wherein at least a part of the opposing surface has an oblique inclination or a curve with respect to the contact surface with the pressure-sensitive portion. The pressure detector of the description.
[Claim 6]
In the pressure-sensitive portion, a conductive member having a predetermined electric resistance is laid on the sheet surface, and even when the pressing force is low, the contact area is increased with the portion in contact with the elastic member and when the pressing force is high. The pressure detecting device according to claim 5, wherein the density at which the conductive member is laid differs depending on the portion to be newly contacted.
[Claim 7]
The pressure-sensitive portion is a carbon sheet or a carbon printed circuit board on which carbon is printed as the conductive member, and the density for printing the carbon is different between the central portion and the peripheral portion, according to claim 5 or 6. Pressure detector.
[Claim 8]
The facing surface of the elastic member is formed on a curved surface around the outer edge of the facing surface with a predetermined curvature, or is formed so as to provide a bottom curved surface having a predetermined curvature protruding downward on the facing surface, or is predetermined on the facing surface. The pressure detecting device according to any one of claims 1 to 7, wherein a plurality of convex portions forming an envelope surface of curvature are formed so as to be arranged in a matrix.
[Claim 9]
The pressure detection device according to any one of claims 1 to 8.
A sound source unit that generates a percussion instrument sound based on a signal output by the pressure detection device in response to pressure detection.
An electronic percussion instrument characterized by being equipped with.

10 Pressure detector 101, 20 Carbon printed circuit board 101a, 21 Insulation board 101b, 22 Carbon pattern layer 102, 23 Spacer 103, 24 Carbon sheet 104, 25 Pad D Strike surface 11 ADC
12 CPU
13 ROM
14 RAM
15 Operation unit 16 Sound source 17 Sound system 100 Electronic percussion instrument

Claims (8)

A pressure-sensitive part that generates an output corresponding to at least the contact area to which the pressing force is applied,
A member having an operation surface and provided so that when a pressing force is applied to the operation surface, the facing surface facing the operation surface comes into contact with the pressure-sensitive portion and elastically deforms. An elastic member whose contact area where the facing surface applies pressing force to the pressure-sensitive portion changes due to elastic deformation according to the pressing force on the operation surface.
Equipped with
The pressure-sensitive portion generates an output corresponding to the pressing force per unit area with respect to the pressure-sensitive portion and the contact area to which the pressing force is applied to the pressure-sensitive portion.
The pressure-sensitive portion and the elastic member refer to the pressure-sensitive portion as the pressing force on the operation surface increases, rather than the change in output due to the change in pressing pressure per unit area with respect to the pressure-sensitive portion. It is provided so that the change in output due to the change in the contact area to which the pressing force is applied becomes larger.
A pressure detector characterized by that. In the pressure-sensitive portion, the rate of change in output with respect to the change in the contact area where the pressing force is applied to the pressure-sensitive portion differs depending on the region where the pressing force is applied to the pressure-sensitive portion.
In the pressure-sensitive portion and the elastic member, the larger the pressing force on the operation surface, the larger the ratio of the change in output to the change in the contact area where the pressing force is applied to the pressure-sensitive portion is larger. The pressure detecting device according to claim 1, wherein the pressure detecting device is provided so that the contact area is large . A pressure-sensitive part that generates an output corresponding to at least the contact area to which the pressing force is applied,
A member having an operation surface and provided so that when a pressing force is applied to the operation surface, the facing surface facing the operation surface comes into contact with the pressure-sensitive portion and elastically deforms. An elastic member whose contact area where the facing surface applies pressing force to the pressure-sensitive portion changes due to elastic deformation according to the pressing force on the operation surface.
Equipped with
In the pressure-sensitive portion, a conductive member having a predetermined electric resistance is laid on the sheet surface, and even when the pressing force is low, the pressing force is higher than the density at which the conductive member is laid at the portion in contact with the elastic member. In this case, the density of laying the conductive member in the portion where the contact area is newly contacted with the increase in the contact area is higher.
A pressure detector characterized by that. The pressure-sensitive portion is a carbon sheet or a carbon printed circuit board on which carbon is printed as the conductive member, and the central portion and the central portion where the density for printing the carbon corresponds to a region including the center of the operation surface. The pressure detection device according to claim 3, wherein the pressure detection device is different from the peripheral portion on the outside of the operation surface corresponding to the region including the outer edge periphery of the operation surface . The pressure detecting device according to any one of claims 1 to 4, wherein the elastic member has a non-uniform shape on the back surface when no pressing force is applied to the operation surface . The elastic member according to any one of claims 1 to 5 , wherein at least a part of the facing surface is inclined or curved with respect to the contact surface with the pressure-sensitive portion. The pressure detector of the description. The facing surface of the elastic member is formed on a curved surface around the outer edge of the facing surface with a predetermined curvature, or is formed so as to provide a bottom curved surface having a predetermined curvature protruding downward on the facing surface, or is predetermined on the facing surface. The pressure detecting device according to any one of claims 1 to 6, wherein a plurality of convex portions forming an envelope surface of curvature are formed so as to be arranged in a matrix . The pressure detection device according to any one of claims 1 to 7.
A sound source unit that generates a percussion instrument sound based on a signal output by the pressure detection device in response to pressure detection.
An electronic percussion instrument characterized by being equipped with.

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