JP2009037041A - Beat detection device for electronic percussion instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect presence or absence of a beat with high accuracy with a simple and low cost configuration. <P>SOLUTION: A plurality of recessed parts 23 are formed on a top surface side of a base object 20 and a pad section 30 comprising an elastic material is bonded to the base object 20 from its upper side and thereby space parts S (S1 to S6) which are confined air cells are delineated by the respective recessed parts 23 and the pad section 30. Communicative connection sections 21 which are through-holes communicating with an outdoor side are formed at the bottom of each recessed part 23. Sensor sections 10 are arranged in the communicative connection sections 21. When the pad section 30 is beat, the pad section 30 is instantaneously bent to the space part S side existing below beat position by the elasticity thereof and the internal pressure of the space parts S is increased to bend diaphragms 14 of the sensor sections 10. As a result, the detection signal complying with the beat intensity is output from the sensor sections 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hit detection device for an electronic percussion instrument that detects a hit and obtains a detection signal for generating a musical sound.

  2. Description of the Related Art Conventionally, an electronic percussion instrument that includes a hit detection device that detects a hit and generates a musical sound based on the detection output is known.

  For example, the electronic percussion instrument of Patent Document 1 below includes a first electrode attached to the lower surface of the striking surface, a pressure-sensitive resistance element that is attached to the lower surface of the first electrode, and the resistance value changes according to the impact strength, A resistance surface provided at a lower portion of the pressure-sensitive resistance element; and second and third electrodes in which a ratio of the resistance values of the resistance surface varies according to a hit position on the resistance surface.

Then, when the portion of the pressure sensitive resistance element located below the striking surface hits the resistance surface, the ratio of the resistance value between the second and third electrodes changes, and this change is detected. By doing so, the striking position is detected. Further, the resistance value of the pressure-sensitive resistance element also changes according to the impact force, and the impact strength is detected by detecting this change.
Japanese Patent No. 2944402

  However, in the electronic percussion instrument disclosed in Patent Document 1, it is difficult to manufacture a pressure-sensitive resistance element with small variations in characteristics. Therefore, there is a problem that it is difficult to reduce variations in detection accuracy while keeping costs low. there were.

  In addition, since a pressure-sensitive resistance element having a large area is required corresponding to the hit area, the material cost is increased, which not only leads to an increase in cost, but it is also necessary to stick the pressure-sensitive resistance element over the entire striking surface. Because there is, it is not easy to configure.

  By the way, in the electronic percussion instrument of the above-mentioned Patent Document 1, not only the presence / absence of hitting but also the hitting strength and hitting position can be detected, but it takes time to separate the hitting strength information and the hitting position information, The reaction rate was slow, and it was difficult to detect high-speed continuous hits with high accuracy.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a percussion detection device for an electronic percussion instrument that can detect the presence or absence of percussion with high accuracy with a simple and low-cost configuration. Is to provide.

  In order to achieve the above object, a hit detection device for an electronic percussion instrument according to claim 1 of the present invention is composed of a base body (20) and an elastic material, and is disposed on the upper side of the base body to be hit. Part (30) and a sensor part (10) for outputting a detection signal for generating a musical sound, and recesses (23, 30c, 23) formed on at least one of the base body and the pad part facing each other. 20a), a space portion (S) is defined between the base body and the pad portion, and at the moment when the pad portion is struck, the striking portion of the pad portion is bent toward the space portion. The volume of the space portion is configured to be temporarily reduced, and the base body is formed with a communication portion (21) that communicates from the space portion to the outside air side, and the sensor portion is disposed in the communication portion. , The internal pressure of the space rises momentarily Things, or air in the outdoor air through the communicating portion from the space portion and detects that the instantaneously flowing.

  In order to achieve the above object, a hit detection device for an electronic percussion instrument according to claim 2 of the present invention is composed of a base body, a pad portion which is made of an elastic material, and is disposed on the upper side of the base body to be hit. A sensor unit that outputs a detection signal for generating a musical sound, and a recess formed on at least one of the base member and the pad unit facing each other, so that the base member and the pad unit are The first and second space portions (SA, SB) communicating with the communication portion (27a) are defined, and at the moment when the pad portion is hit, the hit portion of the pad portion is the first space portion and / or The volume of the space portion on the side where the pad portion is bent by being bent toward the second space portion is temporarily reduced, and the sensor portion is disposed in the communication portion, A moment between the first space portion and the second space portion Thing the pressure difference is generated, or, between said first, second space, the air through the communicating portion and detects that the instantaneously flowing.

  In order to achieve the above object, a hit detection device for an electronic percussion instrument according to claim 3 of the present invention is composed of a base body, an elastic material, and is disposed on the upper side of the base body to be hit, A sensor portion that outputs a detection signal for generating a musical sound, and a space portion between the base body and the pad portion by a recess formed on at least one of the mutually opposing surfaces of the base body and the pad portion. Is defined, and at the moment when the pad portion is struck, the volume of the space portion is temporarily reduced by bending the striking portion of the pad portion toward the space portion side, and the sensor portion is , And being housed in the space portion, and detecting that the internal pressure of the space portion has increased instantaneously.

  Preferably, the sensor unit detects an amount of change in internal pressure of the space part or a flow rate of air flowing from the space part to the outside air through the communication part (claim 4). Alternatively, the sensor unit includes a change amount of an internal pressure difference between the first space part and the second space part, or air that has flowed through the communication part between the first and second space parts. Is detected (claim 5). Or the said sensor part detects the amount of internal pressure changes of the said space part (Claim 6), It is characterized by the above-mentioned.

  Preferably, a plurality of the space portions are provided and the sensor portion is provided for each space portion, and further, a position grasping means for grasping a striking position in the pad portion based on a detection result of each sensor portion (1 (Claim 7). Furthermore, each of the space portions is defined in a concentric annular shape having different radii (claim 8).

  Preferably, a plurality of sets of the first and second space portions are provided, and the sensor portion is provided for each set of the space portions, and further, the impact on the pad portion is determined based on the detection result of each sensor portion. Position grasping means for grasping the position is provided (claim 9). In addition, each of the space portions has a uniform width in plan view, and the width of each space portion is the same (claim 10).

  Preferably, the two communication parts are provided at positions spaced apart from each other in the same space part, and the sensor part is also provided in the two communication parts, and further, both the communication parts are provided in the two communication parts. Based on the output time difference of the detection signal output from the sensor unit, there is provided a position grasping means for grasping the striking position in the pad portion. Or two said sensor parts are provided in the mutually spaced-apart position in the same space part, and also grasp | ascertain the striking position in the said pad part based on the output time difference of the detection signal output from both said sensor parts It has a position grasping means (claim 12). The space is formed in a spiral shape in plan view (claim 13).

  In addition, the code | symbol in the said parenthesis is an illustration.

  According to the first, second, and third aspects of the present invention, it is possible to detect the presence or absence of hitting with high accuracy with a simple and low-cost configuration.

  According to the fourth, fifth, and sixth aspects, the striking strength can be detected.

  According to the seventh aspect, it is possible to grasp the striking position based on the arrangement of the space portions without requiring complicated processing.

  According to the eighth aspect, the striking position in the radial direction of the base body 2 can be grasped.

  According to the ninth aspect, the striking position can be grasped based on the arrangement of the space portions without requiring complicated processing.

  According to the tenth aspect, it is possible to uniformize the amount of change in the volume of each space portion by hitting with the same strength, and obtain a uniform detection result regardless of the hitting position.

  According to the eleventh and twelfth aspects, the striking position can be grasped by the two sensor portions. Depending on the arrangement form of the space part, it is also possible to grasp the striking position over the entire pad part.

  According to the thirteenth aspect, it is possible to efficiently secure the length of the space portion, to easily dispose the two sensor portions apart, and to improve the detection accuracy of the hitting position. Further, the hitting position can be grasped over the entire pad portion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1A is a plan view of one drum pad to which the percussion detecting device for an electronic percussion instrument according to the first embodiment of the present invention is applied. FIG.1 (b) is sectional drawing which follows the AA line of Fig.1 (a). This drum pad is configured for an electronic drum. Examples of the object used as the drum pad include, but are not limited to, a snare drum, a tom tom, and a cymbal. Although the entire electronic percussion instrument is not shown, a plurality of drum pads having the same configuration are provided. By varying the tone color assigned to each drum pad, it is possible to generate various drum sounds in the drum set even with the same configuration.

  FIG. 2 is a block diagram of a control mechanism including a hit detection device in the electronic percussion instrument. As shown in FIG. 2, the electronic percussion instrument includes a storage device 2, a ROM 3, a RAM 4, an operation input unit 5, an A / D converter 6, a display unit 7, a musical sound generation unit 8, a timer 17, and various interfaces 9. Each is connected to the CPU 1 via the bus 11. The timer 17 is also connected to the CPU 1. The A / D converter 6 receives signals from a plurality of sensor units 10 (10-1 to 10-6).

  The CPU 1 controls the entire apparatus. The ROM 3 stores a control program executed by the CPU 1 and various table data. The RAM 4 temporarily stores various input information such as performance data and text data, various flags, buffer data, and calculation results. The timer 17 measures the interrupt time and various times in the timer interrupt process. The storage device 2 is configured by a flash memory or the like, and can store automatic performance data and the like, as well as various application programs including the control program.

  The operation input unit 5 includes various operators. The display unit 7 is composed of an LCD or the like and displays various information. The musical sound generating unit 8 includes a sound system and a speaker (not shown), and generates a musical sound due to manual performance based on a detection signal from the sensor unit 10 input from the A / D converter 6, and stores it in the storage device 2. Automatic reproduction can be performed based on the automatic performance data. The various interfaces 9 include a wired or wireless network I / F in addition to MIDII / F (interface).

  Mainly, the CPU 1, the timer 17, the A / D converter 6, the sensor unit 10, the storage device 2, the ROM 3, and the RAM 4 function as the “blow detection device” in the present invention.

  As shown in FIG. 1, the drum pad includes a disk-shaped base body 20 made of a metal such as aluminum, and a disk-shaped pad portion 30 disposed on the upper side of the base body 20 and hit with a stick 16. It is out. The pad portion 30 has a slightly smaller diameter than the base body 20, and a frame body (not shown) is attached to a peripheral edge portion that protrudes outward from the pad portion 30 of the base body 20. Although the horizontal positioning of the pad portion 30 with respect to the base body 20 is performed by the frame body, the pad portion 30 may be provided with a positioning step or the like. The base body 20 is not limited to being made of metal, and may have an appropriate rigidity, and may be made of a hard resin or the like. On the other hand, since the pad portion 30 is hit, it is made of an elastic material such as foamed rubber. However, other materials can be used as long as the material has elasticity or flexibility suitable for hitting.

  The pad portion 30 is formed in a circular shape with flat upper and lower surfaces and a uniform thickness. A plurality of recesses 23 are formed on the upper surface side of the base body 20. The recess 23 has one circular center of the base body 20 in a circular shape, and the other five are formed in a concentric annular shape with the same width. An annular rib 22 is interposed between adjacent recesses 23. The pad portion 30 is bonded and fixed to the upper surface of the base body 20 including the upper surface of each rib 22. The adhesion is made through a double-sided tape (not shown), but may be fixed with an adhesive.

  By adhering the pad portion 30 to the base body 20 from the upper side, each concave portion 23 and the lower surface 30a of the pad portion 30 define a space portion S (S1 to S6) that is a closed air chamber. Depending on the planar view shape of the recess 23, the planar view shape of the space portion S1 is circular, and the planar view shapes of the space portions S2 to S6 are concentric rings (donuts). Although the cross-sectional shape of the space S is a rectangle, the shape is not limited. In the base body 20, communication portions 21 (21-1 to 21-6) that are through holes leading to the outside air are formed at the bottom of each recess 23, and the space portion S <b> 1 when viewed from the base body 20 alone. To S6 communicate with the outside air through the corresponding communicating portions 21-1 to 21-6.

  One communication portion 21 is provided for each space portion S. As shown to Fig.1 (a), arrangement | positioning of the communication part 21 is linear. The reason why the communication portion 21 is disposed on the opposite side of the center point of the base body 20 for each adjacent space S is to ensure the strength of the base body 20. However, the communication part 21 should just respond | correspond to the space part S, is not restricted to linear arrangement | positioning, and the arrangement position in a horizontal direction is not restricted to this example. In FIG. 1A, any one of the upper, lower, left and right sides of the figure may be the player side of the drum pad.

  Fig.3 (a) is an enlarged view of the A section of Fig.1 (a). FIG.3 (b) is sectional drawing which follows the BB line of Fig.3 (a). Since the configuration around each communication portion 21 is the same, the communication portion 21-4 will be mainly described as a representative with reference to FIGS. 3 (a) and 3 (b).

  The communication unit 21-4 is provided with a sensor unit 10-4. The sensor unit 10-4 is held by a fixing member 15 that is fixed to the lower surface of the base body 20 by adhesion or the like, and is located near the outlet on the outside air side (the lower surface side of the base body 20) in the communication unit 21-4. ing. In this example, the communication part 21-4 is not completely closed by the fixing member 15, and the space 21a between the communication part 21-4 and the fixing member 15 is interposed between the space S4 and the outside air side. The air can be moved back and forth. Although illustration of the wiring which outputs the signal of the sensor part 10-4 is abbreviate | omitted, it is derived | led-out from the lower surface side exit of the base body 20 of the communication part 21-4, for example.

  FIG. 3C is a cross-sectional view schematically showing the configuration of the sensor unit 10. Each sensor unit 10 has the same configuration. The sensor unit 10 is a pressure sensor. In this example, a silicon microphone is used, and a commercially available one may be used. As shown in FIG. 3C, in the sensor unit 10, a first chamber r1 is formed in the housing 12, and a second chamber r2 is formed in the first chamber r1. A silicon diaphragm 14 is stretched over an upper portion of a wall portion 13 projecting from the bottom of the housing 12, and the second chamber r <b> 2 is defined by the four wall portions 13 and the diaphragm 14.

  An air introduction hole 12 a that communicates the first chamber r <b> 1 and the space S is formed in the upper part of the housing 12. The wall 13 is formed with a minute through hole 13a that allows the first chamber r1 and the second chamber r2 to communicate with each other. The through hole 13a is for coping with changes in atmospheric pressure and outside air temperature, and is sufficiently smaller than the air introduction hole 12a.

  In the sensor unit 10 having such a configuration, when the atmospheric pressure in the space S changes, it is transmitted to the first chamber r1 through the air introduction hole 12a, and the atmospheric pressure in the first chamber r1 also changes in conjunction with it. On the other hand, due to the presence of the through hole 13a, the atmospheric pressure in the second chamber r2 is the same as the first chamber r1 in the initial state where the atmospheric pressure in the space S is in a steady state. Therefore, when the atmospheric pressure in the second chamber r2 changes abruptly, the diaphragm 14 bends (or vibrates) due to an atmospheric pressure difference generated in the first chamber r1. It can be converted into an electrical signal and extracted as a detection signal indicating a pressure change in the space S. In particular, the sensor unit 10 can output a signal corresponding to the degree of atmospheric pressure change. This detection signal is A / D converted by the A / D converter 6 and supplied to the CPU 1.

  In such a configuration, the hit detection is performed as follows. 4 (a) and 4 (b) are partial enlarged views of the drum pad showing the state during performance. The pad portion 30 can be hit by the stick 16 at any position.

  First, as shown in FIG. 4A, when a portion of the pad portion 30 above the space portion S (for example, the space portion S4) is struck, due to the elasticity of the pad portion 30, The pad portion 30 is instantaneously bent toward the space portion S4 located below the striking position. The volume of the space portion S4 decreases by the volume of the bent portion 30b bent downward of the pad portion 30. Since the impact is instantaneous, the internal pressure in the space S4 increases instantaneously, and the diaphragm 14 (see FIG. 3C) of the sensor unit 10-4 is bent through the increase in the internal pressure in the first chamber r1. Thereby, the detection signal according to impact strength is output from the sensor part 10-4.

  In the example of FIG. 4A, the portion of the pad portion 30 corresponding to the space portions S3 and S5 adjacent to the space portion S4 is hardly bent. Therefore, even if a detection signal is not output from the other sensor units 10 including the sensor units 10-3 and 10-5 corresponding to the space units S3 and S5, The level is sufficiently smaller than the output.

  Further, as shown in FIG. 4 (b), a position that straddles two space portions S (for example, space portion S3 and space portion S4) just like when the ball 22 is hit. When the pad portion 30 is hit, the pad portion 30 is instantaneously bent toward the space portion S3 and the space portion S4. The volumes of the space portions S3 and S4 are temporarily reduced by the volume of the respective bending portions 30b. In this case, the sensor units 10-3 and 10-4 (see FIG. 1) corresponding to the space portions S3 and S4 correspond to the pressure changes in the space portions S3 and S4 depending on the volume of the corresponding bending portion 30b. A detection signal is output. The detection signals from the other sensor units 10 are equal to nothing or are at a level sufficiently smaller than the outputs of the sensor units 10-3 and 10-4.

  From the output of the sensor unit 10, the presence / absence of hitting, the hitting position in the radial direction of the base body 20 and the hitting strength are grasped by the CPU 1 as follows. First, when any of the sensor units 10 outputs a signal having a level equal to or higher than a predetermined value, it is grasped that “there is a hit”.

  In the case of “with hit”, when there is one sensor unit 10 that outputs a signal of a level equal to or higher than a predetermined value at the same timing (as illustrated in FIG. 4A), the sensor unit 10 The striking position in the radial direction is grasped from the position of the space part S arranged. That is, since each space part S is concentric-circle arrangement | positioning and positional relationship is known, a striking position can be grasped | ascertained from which sensor part 10 it is an output. The impact strength is grasped from the output signal level of the sensor unit 10.

  In addition, when there are a plurality of sensor units 10 that output signals of a level equal to or higher than a predetermined value at the same timing (as illustrated in FIG. 4B), the striking position is first processed as follows. The For example, if the level ratio of the two sensor units 10 that output a signal having the maximum level and the second largest level (or a level difference, the same applies below in parentheses) is a predetermined value or more, one sensor unit 10 that outputs the maximum level. The striking position in the radial direction is grasped from the position of the space portion S where is disposed. On the other hand, if the level ratio (difference) is within a predetermined range, an intermediate position of the space S where the two sensor units 10 are arranged or a position corresponding to the level ratio (difference) is hit in the radial direction. Position.

  For example, if the level ratio (difference) between the two sensor units 10 is greater than or equal to a predetermined level, the impact strength is grasped based on only the output of one sensor unit 10 that outputs the maximum level. On the other hand, if the level ratio (difference) is within a predetermined range, the level ratio (difference) is grasped based on a value obtained by adding the outputs of the two sensor units 10.

  These processes are examples and are not limited to these. In order to simplify the processing, the hitting position and the hitting strength may be grasped uniformly based only on the output of one sensor unit 10 that has output the maximum level.

  Here, when the width (thickness) of the rib 22 is too thin, the sealing performance of the bonding surface with the pad portion 30 is deteriorated and the pad portion 30 is easily damaged. On the other hand, if it is too thick, a “dead zone” in which the sensor unit 10 does not sufficiently react in any adjacent space S will increase. Therefore, it is preferable to set an appropriate value (for example, several mm) in consideration of both.

  The CPU 1 generates information on the tone color and volume to be generated according to the grasped hitting position and hitting strength, and transmits the information to the musical tone generating unit 8 (see FIG. 2). The musical tone generator 8 generates a drum sound having a volume corresponding to the perceived striking strength with a tone color corresponding to the perceived striking position. It should be noted that which musical sound parameter is controlled according to the determined hitting position and hitting strength is not limited to this example.

  By the way, as described above, each communication portion 21 has a gap 21a (see FIG. 3A) communicating with the outside air, so that the corresponding space portion S has the same atmospheric pressure as the outside air in a steady state where performance is not performed. It has become. On the other hand, since the gap 21a is sufficiently small when viewed from the entire space S, a clear change in atmospheric pressure occurs due to an instantaneous volume change due to impact. Therefore, even if the space portion S is not a complete sealed chamber, the sensor unit 10 can detect the impact.

  The configuration in which the gap 21a is provided and is not completely sealed not only prevents the differential pressure between the space S and the external pressure due to changes in the atmospheric pressure and the outside air temperature, but also makes it easy to pick up noise because the sensitivity at the time of detection is too good. Although it helps to eliminate the inconvenience of becoming, it is not essential from the viewpoint of the presence / absence of hitting. Further, instead of the gap 21a or in addition to the gap 21a, a small through hole that exhibits the same function as the gap 21a may be provided at the bottom of the recess 23 of the base body 20.

  Therefore, the communication part 21 should just communicate with the external air side, when it sees with the base body 20 single-piece | unit, and it does not ask | require whether it is obstruct | occluded by the cross-sectional shape and the sensor part 10. FIG. Moreover, it is not necessary to take a form like a passage. On the other hand, the sensor unit 10 only needs to be “arranged in the communication unit 21”, and does not necessarily have to be arranged in the communication unit 21 as illustrated in FIG. That is, the sensor unit 10 only needs to be disposed at a position that receives the flow of air from the space S to the outside air side or the pressure from the space S, so that the opening on the space S side of the communication unit 21 or It may be arranged near the opening (exit) on the outside air side. Moreover, the fixing means of the sensor unit 10 is not limited, and is not limited to the fixing material 15, and may be bonded and fixed to the base body 20 by itself.

  As described above, the arrangement of the communication portion 21 (or the sensor portion 10) may be any position in the base body 20 as long as it corresponds to each space portion S. Although the distance between the actual striking position and the sensor unit 10 may be short or long, the propagation of the sound wave in the space S is very fast, so that the delay in the generation of the musical sound is not adversely affected. Therefore, the degree of freedom of arrangement of the sensor unit 10 is high.

  According to the present embodiment, the striking force applied to the pad portion 30 is converted into an internal pressure change in the space portion S provided between the base body 20 and the pad portion 30, and this is converted into a plurality of sensors that are pressure sensors. The hit detection is performed by the detection by the unit 10. Since each sensor unit 10 is inexpensive but has little variation in characteristics, it can maintain high detection accuracy. In addition, since it is sufficient that one sensor unit 10 is provided in one space portion S, the configuration is simple and the cost can be reduced as compared with the configuration in which the impact detection is performed by the pressure sensitive resistance element having a large area. .

  Moreover, since the change in the internal pressure of the space S depends on the striking force, the striking strength can be detected. In addition, since the striking position can be grasped from the known position of the space S corresponding to the sensor unit 10 to which the detection signal is output, it is easy to accurately detect high-speed continuous striking without requiring complicated processing. It is. In particular, since each space portion S is a concentric ring except for the space portion S1, it is possible to grasp the striking position in the radial direction, which is important for performance tone determination and the like, with a simple configuration.

  In addition, the space portions S2 to S6, except for the space portion S1, have a uniform width in plan view and the width of each space portion S is the same. The amount of change in volume can be made uniform, and a uniform detection result can be obtained regardless of the striking position. In addition, since the same timbre generates the same tone at the same position in the radial direction, the width of the space portion S can be obtained from the viewpoint of obtaining a uniform detection result regardless of the strike position with the same strength for the generation of the same timbre. Need only be uniform, and may not be shared among the space portions S.

  In the present embodiment, the space S is provided by forming the recess 23 in the base body 20, but is not limited thereto, and may be provided by a recess formed in at least one of the surfaces facing each other. For example, as shown in a modified example of the space portion S in FIG. 5A, the recess 23 may be provided only on the lower surface 30 a side of the pad portion 30 without being provided in the base body 20. Alternatively, as shown in FIG. 5B, another modification of the space portion S, the space portion S is formed by the recess portion 30 c provided on the lower surface side of the pad portion 30 and the recess portion 20 a provided on the upper surface side of the base body 20. It may be defined.

  As described above, since the striking position is grasped based on the arrangement position of the space portion S, the shape, the number, and the degree of arrangement of the space portion S are high, and various modifications are possible as illustrated in FIGS. Examples are possible.

  FIG. 6 is a plan view of one drum pad to which the hit detection device of the first modification example of the present embodiment is applied. As shown in the figure, in this first modification, four partition walls 24 extending in a cross shape in the radial direction are provided, and the drum pad area is divided into the front side, rear side, left side, The space is divided into four parts on the right side, and the concentric space portions S of the respective regions are configured to have a ring shape in plan view as a whole.

  The space portions S1 to S6 exist in the front, rear, left, and right regions, respectively. The space portion S1 has a fan shape, and the space portions S2 to S6 have an arc shape. The sensor unit 10 is provided in each space S. Other configurations are the same as those shown in FIG. When the pad portion 30 is hit, the sensor portion 10 in the space S located below the hitting position outputs a detection signal, so that not only the radial position but also the front, rear, left and right regions can be detected. Therefore, the performance expression is expanded.

  FIG. 7A is a plan view of one drum pad to which the hit detection device of the second modification example of the present embodiment is applied. As shown in the figure, in this second modification, five space portions S (S11 to S11) are composed of four partition walls 26 in the radial direction and an annular partition wall 28 connected to the inside of the partition wall 26 in the radial direction. S15) is defined. That is, a space portion S11 at the center in the radial direction and front and rear, left and right space portions S12 to S15 are provided. The sensor unit 10 is provided in each space S.

  Moreover, in this 2nd modification, since each space part S is not strip | belt shape, the support rib 25 for supporting the pad part 30 so that it may not sag is protrudingly provided by the upper surface of the base body 20. FIG. The upper end positions of the partition wall 26, the annular partition wall 28, and the support rib 25 are common, and the pad portion 30 is bonded thereto. Other configurations are the same as those shown in FIG. Even with such a rough arrangement, the striking force and the position can be detected. The support rib 25 may have any shape that does not divide one space portion S, and a large number of support pins that exhibit the same function may be provided instead of the support rib 25.

  FIG. 7B is a plan view of one drum pad to which the impact detection device of the third modification example in the present embodiment is applied. As shown in the figure, in the third modification, the drum pad is configured in a fan shape. Each space portion S has an arc shape except for the space portion S1. The sensor unit 10 is provided in each space S. Other configurations are the same as those shown in FIG.

  As illustrated in FIGS. 6, 7 (a) and 7 (b), the shape, size, and arrangement of the space S have a degree of freedom, so that not only products that perform highly accurate position detection, but also simple It can be easily adapted for toys.

  In order to make the configuration simpler for inexpensive products such as toys, the sensor unit 10 includes a simplified sensor that can detect only the presence or absence of impact (for example, a sensor that can detect only an instantaneous pressure increase). ) May be adopted. Furthermore, as the simplest configuration example, only one space portion S and one sensor portion 10 may be provided.

(Second Embodiment)
In the first embodiment, the communication portion 21 communicates the space portion S with the outside air. However, in the second embodiment of the present invention, the communication portion communicates the two space portions S. The sensor part 10 is provided in this communication part.

  FIG. 8A is a plan view of one drum pad to which the percussion detecting device for an electronic percussion instrument according to the second embodiment of the present invention is applied. FIG.8 (b) is an enlarged view of the B section of Fig.8 (a).

  In this drum pad, in addition to the plurality of annular ribs 22, the base body 20 is provided with a partition wall 27 that penetrates the center in the radial direction of the base body 20, and each rib 22 has a semicircular or semicircular arc shape. Divided into two. Each space portion S is also divided by the partition wall 27 into a first space portion SA (SA1 to SA6) on one side of the partition wall 27 and a second space portion SB (SB1 to SB6) on the other side. The Each set of the first space portion SA and the second space portion SB corresponds to one annular space portion S in the first embodiment. However, as shown in FIG. 8B, each first space SA on one side of the partition wall 27 and the corresponding second space SB on the other side are communication portions formed on the partition wall 27. 27a communicates with each other.

  The communication part 27a is provided with the sensor part 10 by the fixing material 15 similarly to the communication part 21 in the first embodiment. The fixing position of the fixing member 15 may be either the first space SA or the second space SB. In the first space SA and the second space SB, a small gap (not shown) is formed at the bottom of the base body 20 to make the inner pressure equal to the outer pressure in the steady state. Alternatively, if the communication portion 27a is provided with a gap through which the first space portion SA and the second space portion SB communicate with each other, the gap with which the outside air is communicated is either the first space portion SA or the second space portion SB. It is sufficient to provide it only on one side.

  In this configuration, for example, one set will be described. For example, when the pad portion 30 is hit above the first space portion SA5, the internal pressure of the first space portion SA5 increases, and the second space portion An internal pressure difference instantaneously occurs with SB5. A sensor unit 10 provided between the first space part SA5 and the second space part SB5 outputs a detection signal corresponding to a pressure change in the first space part SA5. The striking position is grasped from the known positions of the first space SA5 and the second space SB5. The grasping process of the striking strength and the striking position when striking between the space portions SA or SB adjacent in the radial direction is the same as that in the first embodiment.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained.

  FIG.8 (c) is a top view of the drum pad of the modification in 2nd Embodiment. FIG.8 (d) is an enlarged view of the C section of FIG.8 (c). In the example of FIGS. 8A and 8B, the first space SA and the second space SB communicated as a set through the communication portion 27a are semicircular or semicircular and have the same curvature. In the modification shown in FIGS. 8C and 8D, the circular or annular space portions adjacent in the radial direction are set as one set.

  For example, as shown in FIG. 8C, a circular first space part SA11 and an outer annular second space part SB11 are paired. Similarly, the inner first space part SA12 and the outer second space part SB12, the inner first space part SA13 and the outer second space part SB13 form a set.

  And as shown in FIG.8 (d), the communication part 22a equivalent to the communication part 27a (refer FIG.8 (b)) is formed in the rib 22 between space part SA and SB which became a group. The sensor part 10 is provided by the fixing material 15 in the communication part 22a. The fixing position of the fixing member 15 may be either the first space SA or the second space SB. A method of providing a gap for making the inner pressure of the first space SA and the second space SB equal to the outer pressure is the same as in the examples of FIGS. 8A and 8B.

  In this modified example, since the number of space portions to be paired is small compared to the example of FIG. 8A, the detection of the striking position is roughly, but in other respects, the example of FIG. Similar effects can be achieved. Further, as compared with the example of FIG. 8A, processing for providing the space S is easy.

  In the first and second embodiments, the sensor unit 10 only needs to be able to detect wind pressure, a sound wave or a pressure including a conceptual pressure as air vibration, as shown in FIG. For example, a piezo element or the like can be used instead of the configuration. In particular, since the sensor unit 10 is disposed in the communication units 21, 27a, and 22a, the sensor unit 10 is a pair of the space S and the outside air in the first embodiment and the pair in the second embodiment. A configuration may be adopted in which a signal is output due to an instantaneous relative pressure difference generated between the existing space portions S. For example, the sensor unit 10 is configured not to have the second chamber r2 (see FIG. 3C) which is an independent chamber for the reference pressure at the time of detection, and the diaphragm 14 is configured to bend due to the relative pressure difference. May be.

  In the first and second embodiments, since the sensor unit 10 is disposed in the communication units 21, 27a, and 22a, the sensor unit 10 may employ a flow rate sensor instead of a pressure sensor. . In that case, it is necessary to configure the communication part so that air can freely flow without being completely blocked. The flow sensor to be employed may be an electric type (electromagnetic type or the like) or a mechanical type (Kalman type or the like). In order to simplify the configuration when a flow sensor is employed, the sensor unit 10 includes a simplified sensor that can detect only the presence or absence of impact (for example, detecting that air has flowed instantaneously through the communication unit). Can be used).

(Third embodiment)
In the first and second embodiments, the sensor unit 10 is provided in the communication unit. However, in the third embodiment of the present invention, the communication unit is eliminated and the sensor unit 10 is accommodated in the space S. To do.

  FIG. 9A is a plan view of one drum pad to which the percussion detecting device for an electronic percussion instrument according to the third embodiment of the present invention is applied. FIG.9 (b) is sectional drawing which follows the CC line | wire of Fig.9 (a).

  This drum pad is similar to the first embodiment (see FIG. 1) in that the space portions S (S1 to S6) are defined by the plurality of recesses 23 provided in the base body 20 and the pad portion 30. is there. However, the communication part 21 (refer FIG. 1) is not provided. As shown in FIG. 9B, the sensor unit 10 is fixedly disposed at the bottom of the recess 23 in the base body 20, but may be within the recess 23, for example, fixed to the side surface of the rib 22. May be. Other configurations are the same as those of the first embodiment.

  In such a configuration, as described above, the sensor unit 10 includes the second chamber r2 that is an independent chamber (see FIG. 3C). Therefore, the pressure of the second chamber r2 is used as a reference. A pressure change can be detected. Needless to say, with respect to the shape of the space portion S, the modifications illustrated in FIGS. 6 and 7 can be appropriately employed.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained.

  In the third embodiment, the sensor unit 10 only needs to be able to detect a wind pressure, a sound wave or a pressure including a concept pressure as air vibration, and has the configuration shown in FIG. However, since a relative pressure difference with respect to the outside air pressure or the like cannot be set as a detection target, it is necessary to have a configuration capable of detecting a pressure change in the space S itself. Therefore, in the base body 20, the second chamber r2 (see FIG. 3C), which is an independent chamber for reference pressure, is essential.

(Fourth embodiment)
In the first to third embodiments, the striking position is grasped from the known arrangement position of the space S. On the other hand, in the fourth embodiment of the present invention, the space portion S is configured to be long and the sensor portions 10 are disposed at both ends thereof, and the striking position is determined from the signal output time difference between the two sensor portions 10. To grasp.

  FIG. 10 is a plan view of one drum pad to which the impact detection device for an electronic percussion instrument according to the fourth embodiment of the present invention is applied. In this drum pad, one space portion S is defined by one concave portion 23 provided in the base body 20 and the pad portion 30. Together with the ribs 22, the recesses 23 to the space S are formed in a spiral shape in a plan view. A communication portion 21 is provided at each of the first end portion Sa on the outer side and the second end portion Sb on the inner side of the space S, and the sensor portion 10 is provided at each communication portion 21. The width of the space S in plan view is uniform. Other configurations are the same as those of the first embodiment.

  The total length of the space S is about 4 m. Although the propagation of the sound wave in the space S at the time of hitting is very fast, since the space S is long, there is a significant difference in the timing at which the sound wave reaches both ends of the space S depending on the striking position. Can occur.

  FIG. 11 is a conceptual diagram showing a striking position detection method in the present embodiment. In this method, the striking position is grasped as the distance from the first sensor signal output from the two sensor units 10 corresponding to each striking. Since the position of each sensor unit 10 is known, if the distance from the sensor unit 10 is known, the plane coordinates of the striking position on the pad unit 30 can also be grasped. The processing for grasping coordinates is performed by the CPU 1.

  In FIG. 11, when the striking position P along the extending direction of the space S is hit, the sensor section 10A on the side closer to the striking position P of the sensor sections 10 at both ends, and the sensor section on the far side. 10B. The distance between the sensor units 10A and 10B along the extending direction of the space S is “R0”, and the distance from the striking position P to the sensor unit 10A is “Rx”. In addition, the time required for the sound wave generated by the impact to travel the distance R0 is “T0”. The distance R0 and the time T0 are known.

  When hit at the striking position P, the sound waves generated thereby propagate to both sides in the extending direction of the space S, and after the time T1, the distance Rx is separated from the position of the sensor 10A and the striking position P toward the sensor 10B. It reaches the middle position Px. At this point, the sensor unit 10A outputs a detection signal. Further, after time T2 has passed, the sound wave reaches the sensor unit 10B, and a detection signal is output from the sensor unit 10B at that time.

A distance Rx from the sensor unit 10A that first outputs a signal to the striking position P is calculated by the following Equation 1.
[Equation 1]
Rx = R0 × {(T0−T2) / 2} / T0
In this way, the striking position P in the extending direction of the space S is calculated. Then, from the striking position P, the plane coordinates (or radial position) of the striking position on the pad portion 30 are grasped. For example, the impact strength is grasped by adding the outputs of both sensor units 10, but may be grasped using only one of the outputs.

  By the way, when the upper portion of the rib 22 of the pad portion 30 is hit, two portions of the space portion S adjacent in the radial direction are bent, so that two detections are made from the same sensor portion 10 by one hit. The signal can be continuously output with a very short time difference (time interval for one round of the space S). In order to deal with this case, for example, if it is limited to the process of grasping the position, the position calculation process is performed only by the first output signal. As for the impact strength, outputs of very short time differences (time intervals for one round of the space S) are added.

  In the present embodiment, the process for grasping the striking position and the striking strength is an example, and the present invention is not limited to this, and the optimum processing method may vary depending on the shape of the space S. .

  According to the present embodiment, the striking position can be detected by a relatively simple process based on the outputs of the two sensor units 10, and the same effects as those of the first embodiment can be achieved.

  Further, since the space portion S is spiral, the length of the space portion S can be efficiently secured within the limited area of the base body 20, the two sensor portions 10 can be easily spaced apart, and the impact position can be reduced. Detection accuracy can be increased. In addition, the striking position (coordinates) can be grasped over the entire pad portion 30.

  By the way, the two sensor parts 10 should just be spaced apart, and do not necessarily need to be arrange | positioned at the edge part of the space part S. FIG. The distance between the two sensor units 10 is preferably short from the viewpoint of reducing the detection delay, but is preferably far from the viewpoint of position detection accuracy. However, it is not limited to this. Moreover, the space part S may not be strip | belt shape.

  In the present embodiment, the space portion S has a spiral shape, but the shape for securing an appropriate length is not limited to the spiral shape, as in the modified examples shown in FIGS. It is good also as a shape. FIGS. 12A and 12B are diagrams schematically showing a planar view shape of the space portion S of the modification. The communication part 21 and the sensor part 10 are arranged at both ends of each space part S. As described above, if the space portion S is formed over almost the entire region of the pad portion 30 in the form of one stroke writing, the coordinates of the striking position can be grasped in a wide range. The shape of the space S is not limited to those illustrated.

  In the fourth embodiment (FIGS. 10 and 12), the configuration of the sensor unit 10 is as shown in FIG. However, if the sensor unit 10 is configured to output a signal due to a pressure difference generated between the space S and the outside air through the communication unit 21, the second chamber r2 (see FIG. 3C) is provided. It is good also as a structure which does not have. Or while using the sensor part 10 with the 2nd chamber r2, you may abolish the communication part 21 similarly to 3rd Embodiment (refer FIG. 9). Alternatively, only one of the sensor units 10 provided in the space S may be configured with the second chamber r2, and the communication unit 21 corresponding to the sensor unit 10 may be eliminated.

  In addition, the structure which provides the recessed part 23 only in the base body 20, the pad part 30, or the pad part 30, and defines the space part S as shown to FIG. The present invention can also be applied to the four embodiments. In the third embodiment (FIGS. 8A to 8D), when defining the space portions SA and SB, the modification shown in FIGS. 5A and 5B is applied. The parts 27 a and 22 a are also formed only on the base body 20 and the pad part 30 or the pad part 30.

1 is a plan view (FIG. 1 (a)) of a drum pad to which a percussion detecting device for an electronic percussion instrument according to a first embodiment of the present invention is applied, and a cross-sectional view taken along line AA in FIG. 1 (a). (Figure (b)). It is a block diagram of the control mechanism containing the impact detection apparatus in this electronic percussion instrument. Enlarged view (part (a)) of part A in FIG. 1 (a), sectional view (part (b)) taken along line BB in FIG. 3 (a), sectional view schematically showing the configuration of the sensor part (Figure (c)). It is the elements on larger scale (Drawing (a) and (b)) of the drum pad which shows the state at the time of performance. It is a fragmentary sectional view (Drawing (a) and (b)) of a drum pad which shows a modification of a space part. It is a top view of one drum pad with which the hit detection device of the 1st modification in this embodiment is applied. It is a top view (Drawing (a) and (b)) of one drum pad to which the hit detection device of the 2nd and 3rd modification in this embodiment is applied. The top view (FIG. (A)) of one drum pad with which the impact detection apparatus for electronic percussion instruments concerning the 2nd Embodiment of this invention is applied, The enlarged view of the B section of the same figure (a) (FIG. ( b)), a plan view of a drum pad of a modified example (FIG. (c)), and an enlarged view of part C of FIG. (c) (FIG. (d)). The top view (FIG. (A)) of one drum pad with which the impact detection apparatus for electronic percussion instruments which concerns on the 3rd Embodiment of this invention is applied, Sectional drawing which follows the CC line | wire of the same figure (a) (Figure (b)). It is a top view of one drum pad with which the hit detection device for electronic percussion instruments concerning a 4th embodiment of the present invention is applied. It is a conceptual diagram which shows the striking position detection method in this Embodiment. It is a figure (Drawing (a) and (b)) showing typically the plane view shape of the space part of a modification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 CPU (position grasping means), 10 sensor part, 20 base body, 21, 27a communication part, 30 pad part, 23, 20a, 30c recessed part, S space part, SA 1st space part, SB 2nd space part

Claims (13)

A base body,
A pad portion made of an elastic material, disposed on the upper side of the base body and struck,
A sensor unit that outputs a detection signal for generating musical sound,
A space portion is defined between the base body and the pad portion by a recess formed on at least one of the mutually opposing surfaces of the base body and the pad portion,
The moment the pad portion is struck, the striking portion of the pad portion is configured to bend toward the space portion, so that the volume of the space portion is temporarily reduced.
The base body is formed with a communication portion that leads from the space portion to the outside air side,
The sensor unit is disposed in the communication part, and detects that the internal pressure of the space part has instantaneously increased or that air has instantaneously flowed from the space part to the outside air through the communication part. A hit detection device for an electronic percussion instrument. A base body,
A pad portion made of an elastic material, disposed on the upper side of the base body and struck,
A sensor unit that outputs a detection signal for generating musical sound,
First and second space portions that communicate with each other through a communicating portion are defined between the base body and the pad portion by a recess formed in at least one of the opposing surfaces of the base body and the pad portion. ,
At the moment when the pad portion is hit, the hit portion of the pad portion is bent toward the first space portion and / or the second space portion, so that the pad portion is bent. Configured to temporarily reduce the volume,
The sensor portion is disposed in the communication portion, and an instantaneous internal pressure difference has occurred between the first space portion and the second space portion, or the first and second spaces. A hit detection device for an electronic percussion instrument, characterized in that it detects that air has instantaneously flowed between the parts through the communication part. A base body,
A pad portion made of an elastic material, disposed on the upper side of the base body and struck,
A sensor unit that outputs a detection signal for generating musical sound,
A space portion is defined between the base body and the pad portion by a recess formed on at least one of the mutually opposing surfaces of the base body and the pad portion,
The moment the pad portion is struck, the striking portion of the pad portion is configured to bend toward the space portion, so that the volume of the space portion is temporarily reduced.
The hit detection device for an electronic percussion instrument, wherein the sensor unit is housed in the space portion and detects that the internal pressure of the space portion has increased instantaneously.   2. The percussion detection for an electronic percussion instrument according to claim 1, wherein the sensor unit detects an internal pressure change amount of the space part or a flow rate of air flowing from the space part to the outside air through the communication part. apparatus.   The sensor unit includes a change amount of an internal pressure difference between the first space part and the second space part, or a flow rate of air flowing through the communication part between the first and second space parts. The hit detection device for an electronic percussion instrument according to claim 2, wherein:   The hit detection device for an electronic percussion instrument according to claim 3, wherein the sensor unit detects an amount of change in internal pressure of the space.   A plurality of the space portions are provided and the sensor portion is provided for each space portion, and further has position grasping means for grasping a striking position in the pad portion based on a detection result of each sensor portion. The hit detection device for an electronic percussion instrument according to claim 1, 3, 4, or 6.   8. The percussion detection device for an electronic percussion instrument according to claim 7, wherein each of the space portions is defined in a concentric ring shape having different radii.   A plurality of sets of the first and second space portions are provided, and the sensor portions are provided for each set of the space portions, and further, the hit position in the pad portion is grasped based on the detection result of each sensor portion. 6. A hit detecting device for an electronic percussion instrument according to claim 2, further comprising a position grasping means.   The percussion detection device for an electronic percussion instrument according to any one of claims 7 to 9, wherein each space portion has a uniform width in plan view and a common width in each space portion. .   Two communicating portions are provided at positions spaced apart from each other in the same space portion, and the sensor portions are also disposed in the both communicating portions, and further from both sensor portions disposed in the both communicating portions. 5. The hit detection device for an electronic percussion instrument according to claim 1, further comprising position grasping means for grasping a hit position in the pad portion based on an output time difference between output detection signals.   Two sensor units are provided at positions spaced apart from each other in the same space, and further, a position grasping unit for grasping a striking position in the pad unit based on an output time difference between detection signals output from the two sensor units. The hit detection device for an electronic percussion instrument according to claim 3 or 6, further comprising means.   The hit detection device for an electronic percussion instrument according to claim 11 or 12, wherein the space portion is formed in a spiral shape in a plan view.

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