Sensor module for electronic wind instrument, electronic wind instrument and method for detecting exhalation

Abstract

A sensor module for an electronic wind instrument, an electronic wind instrument, and a breath detection method that can accurately detect breath. The sensor module for an electronic wind instrument includes: a main flow path formed between a breath inlet and an exhaust outlet provided on an outer surface of a frame of the electronic wind instrument; a branch flow path branched in a manner that intersects the main flow path; and a sensor provided in the branch flow path that detects a change in airflow in the branch flow path due to a change in breath flowing in the main flow path. A cross-sectional area of a first opening of the branch flow path formed at a connection portion of the main flow path and the branch flow path is smaller than a cross-sectional area of the main flow path at the connection portion.

Description

Technical Field

[0001] This invention relates to a sensor module for an electronic wind instrument, an electronic wind instrument, and a method for detecting exhalation, and more particularly to a sensor module for an electronic wind instrument, an electronic wind instrument, and a method for detecting exhalation that can detect exhalation with good accuracy. Background Technology

[0002] For example, Patent Document 1 describes an electronic wind instrument in which a region dividing member E is assembled inside a tube body P having a mouthpiece 1. The region dividing member E has a first air inlet region 4 and a second air inlet region 5 extending axially from the mouthpiece 1 to both sides of the tube body P. Pressure sensors 8 and 9 are provided in these first air inlet regions 4 and second air inlet regions 5 to detect the exhaled air blown into the mouthpiece 1.

[0003] Because pressure sensors 8 and 9 are located at the axial ends of the first breath inlet area 4 and the second breath inlet area 5, the direct contact of the performer's exhalation with pressure sensors 8 and 9 can be prevented. Therefore, saliva contained in the exhalation can be prevented from adhering to pressure sensors 8 and 9, thus preventing a decrease in the detection accuracy of pressure sensors 8 and 9 for exhalation.

[0004] [Existing technical documents]

[0005] [Patent Literature]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2010-262077 (e.g., paragraphs 0009 to 0013, Figures 1-3 ) Summary of the Invention

[0007] [The problem the invention aims to solve]

[0008] However, since the performer's exhalation contains not only saliva but also moisture, in the prior art, when the moisture-containing exhalation flows towards the pressure sensors 8 and 9, moisture generated by condensation sometimes adheres to the pressure sensors 8 and 9. Therefore, there is a problem that the detection accuracy of the pressure sensors 8 and 9 for exhalation cannot be sufficiently improved.

[0009] This invention was developed to address the aforementioned problems, and its purpose is to provide a sensor module for electronic wind instruments, an electronic wind instrument, and a method for detecting exhalation that can improve the accuracy of exhalation detection.

[0010] [Technical means to solve the problem]

[0011] To achieve the aforementioned objective, the sensor module for an electronic wind instrument of the present invention includes: a main flow path formed between an exhalation inlet and an exhaust outlet disposed on the outer surface of the frame of the electronic wind instrument; a branch flow path branching off in a manner intersecting with the main flow path; and a sensor disposed in the branch flow path for detecting changes in airflow in the branch flow path caused by changes in the exhalation flowing in the main flow path, wherein the cross-sectional area of ​​the first opening of the branch flow path formed at the connection portion of the main flow path is smaller than the cross-sectional area of ​​the main flow path at the connection portion of the main flow path and the branch flow path.

[0012] The electronic wind instrument of the present invention includes a frame having an exhalation inlet and an exhaust outlet formed on its outer surface, and the sensor module of the present invention is disposed within the frame.

[0013] The exhalation detection method of the present invention is an exhalation detection method for an electronic wind instrument. The electronic wind instrument includes: a frame having an exhalation inlet and an exhalation outlet formed on its outer surface; a main flow path formed between the inlet and the exhalation outlet of the frame; a branch flow path branching off in a manner that intersects with the main flow path; and a sensor disposed in the branch flow path. In the exhalation detection method, compared to the cross-sectional area of ​​the main flow path at the connection portion between the main flow path and the branch flow path, the cross-sectional area of ​​the first opening of the branch flow path formed at the connection portion is reduced, and the sensor detects the change in airflow in the branch flow path caused by the change in exhalation flowing in the main flow path. Attached Figure Description

[0014] Figure 1 (a) is a perspective view of the electronic wind instrument according to the first embodiment. Figure 1 (b) is a magnified stereoscopic view of an electronic wind instrument after the main body of the instrument has been disassembled.

[0015] Figure 2 This is an exploded 3D view of the inlet unit.

[0016] Figure 3 (a) is a three-dimensional view of the lip plate as seen from the inner circumferential side. Figure 3 (b) is a partially enlarged cross-sectional view of the inlet unit.

[0017] Figure 4 yes Figure 3 (b) A partially enlarged cross-sectional view of the blow-in unit at line IV-IV.

[0018] Figure 5 (a) is Figure 4 A partially enlarged cross-sectional view of the blow-in unit at the Va-Va line. Figure 5 (b) is Figure 4 A partially enlarged cross-sectional view of the blow-in unit at the Vb-Vb line.

[0019] Figure 6 This is a partially enlarged cross-sectional view of the electronic wind instrument according to the second embodiment.

[0020] Explanation of icon numbers

[0021] 1: Electronic wind instruments

[0022] 32: Blow into the side frame (frame)

[0023] 33: Exhaust side frame (frame)

[0024] 310: Upward blowing into the mouth (blowing into the mouth)

[0025] 311: Downward blowing inlet (blowing inlet)

[0026] 314a, 314b: First curved flow path (part of the main flow path)

[0027] 315a, 315b: Second curved flow path (part of the main flow path)

[0028] 316a, 316b: Throttling flow paths (part of the main flow path)

[0029] 322b: Leakage Flow Path

[0030] 323: Frame side flow path (part of the main flow path)

[0031] 326: Throttling flow path (part of the main flow path)

[0032] 333b: concave part

[0033] 334: First exhaust port (exhaust port)

[0034] 335: Second exhaust port (exhaust port)

[0035] 355: Shell side flow path (part of the main flow path)

[0036] 356, 380: Branch Flow Paths

[0037] 356a, 380a: Opening (first opening)

[0038] 356b: Opening (Second Opening)

[0039] 357: Protrusion

[0040] 360: Temperature sensor (sensor)

[0041] 362: Heater

[0042] 363: Pressure sensor (sensor)

[0043] B3: Bolts (fastening components)

[0044] Sa, Sb: Sensor modules Detailed Implementation

[0045] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings. First, referring to... Figure 1 of (a) Figure 1 (b) and Figure 2 The overall structure of the electronic wind instrument 1 according to the first embodiment will be described. Figure 1 (a) is a perspective view of the electronic wind instrument 1 according to the first embodiment. Figure 1 (b) is a partially enlarged stereoscopic view of the electronic wind instrument 1 after the instrument body 2 has been disassembled. Figure 2 This is an exploded perspective view of the blowhole unit 3. Furthermore, in the following description, the direction orthogonal to the axis (long side direction) of the electronic wind instrument 1 will be described as radial, and the direction around the axis will be described as circumferential.

[0046] like Figure 1 of (a) Figure 1 As shown in (b), the electronic wind instrument 1 is an electronic instrument that simulates an acoustic wind instrument (in this embodiment, a flute). The electronic wind instrument 1 includes an instrument body 2 that simulates the main tube of a flute, and an inlet unit 3 that simulates a head tube is installed at the axial end of the instrument body 2.

[0047] The instrument body 2 includes a generally semi-cylindrical upper frame 21 (first frame) and a lower frame 22 (second frame). Multiple keys 20 are mounted on the outer peripheral surface of the upper frame 21. A cylindrical protrusion 210 is integrally formed at the end of the upper frame 21 on the axial direction of the blowhole unit 3 side. The protrusion 210 protrudes from the inner peripheral surface of the upper frame 21 toward the lower frame 22. An insertion hole 220 is formed in the lower frame 22 for a bolt B1 to pass through at a position corresponding to the front end of the protrusion 210.

[0048] An insertion hole 30 is formed at the end of the instrument body 2 on the axial side of the mouthpiece unit 3 for inserting a protrusion 210 of the upper frame 21. A threaded hole (not shown) is formed at the front end of the protrusion 210 of the upper frame 21. With the protrusion 210 of the upper frame 21 inserted into the insertion hole 30 of the mouthpiece unit 3, a bolt B1 passing through the insertion hole 220 is screwed into the protrusion 210, thereby mounting the mouthpiece unit 3 onto the instrument body 2.

[0049] A lip plate 31 is installed on the outer peripheral surface of the inlet unit 3. An upper inlet 310 (first inlet) and a lower inlet 311 (second inlet) are arranged circumferentially on the lip plate 31. Each inlet 310 and 311 is a rectangular opening extending laterally along the axial direction of the inlet unit 3. The player performs the electronic wind instrument 1 by switching the direction of exhalation (split blowing) to each inlet 310 and 311 while operating the button 20.

[0050] Electronic components such as the substrate 23 are housed in the internal space surrounded by the frames 21 and 22 of the instrument body 2. A central processing unit (CPU) is provided on the substrate 23, which generates musical sounds based on the operation state of the button 20 or the blowing state (blowing volume) of exhalation into each blowhole 310 and 311 through the musical sound generation processing performed by the CPU.

[0051] like Figure 2 As shown, the inlet unit 3 includes a generally semi-cylindrical inlet side frame 32 (third frame) and an exhaust side frame 33 (fourth frame). Each frame 32 and 33 is a resin part including a large-diameter portion 320 and a large-diameter portion 330, and a small-diameter portion 321 and a small-diameter portion 331 formed on one axial end of the large-diameter portions 320 and 330, with a diameter smaller than that of the large-diameter portions 320 and 330.

[0052] The large-diameter portion 320 and the small-diameter portion 321 of the inlet side frame 32 are integrally formed, and similarly, the large-diameter portion 330 and the small-diameter portion 331 of the exhaust side frame 33 are integrally formed. Semi-elliptical cutouts 321a and 331a are formed at both circumferential ends of the small-diameter portions 321 and 331 of each frame 32 and 33, respectively, and the frames 32 and 33 overlap each other, thereby forming the insertion hole 30 (see reference). Figure 1 (b)

[0053] A mounting hole 322 for mounting a lip plate 31 is formed in the large-diameter portion 320 of the blow-in side frame 32. A substrate 34 is sandwiched between the bottom surface 322a of the mounting hole 322 and the lip plate 31. The substrate 34 is a component for heating the lip plate 31 to remove moisture. Details of the heating structure will be described later.

[0054] A boss 332 for fixing a lip plate 31 is integrally formed on the inner circumferential surface of the large-diameter portion 330 of the exhaust side frame 33. The boss 332 is a cylindrical protrusion that rises from the inner circumferential surface of the large-diameter portion 330 towards the blow-in side frame 32. An insertion hole 332a for inserting a bolt B2 is formed at the center of the boss 332, and a similar insertion hole 340 is also formed on the base plate 34 (the bottom surface 322a of the mounting hole 322). The bolts B2, which are inserted into the insertion holes 332a and 340 of the boss 332 and the base plate 34, are screwed into the threaded hole 312 of the lip plate 31 (see reference). Figure 3 of (a) Figure 3 (b)), the lip plate 31 is fixed in the mounting hole 322 (outer peripheral surface) of the blow-in side frame 32.

[0055] A frame-side flow path 323 is formed on the bottom surface 322a of the mounting hole 322 for allowing exhaled air blown in from each blow-in port 310, 311 to pass through. The frame-side flow paths 323 are arranged in a pair, spaced apart axially in the blow-in side frame 32 (blow-in port unit 3). The exhaled air passing through the pair of frame-side flow paths 323 is guided to a pair of sensor modules Sa, Sb.

[0056] A pair of sensor modules Sa and Sb are symmetrically arranged with respect to a plane orthogonal to the axis of the inlet unit 3 (including the plane of each inlet 310, 311) as the plane of symmetry (hereinafter, the same symmetry will be simply referred to as "symmetry"). Sensor module Sa is a component for detecting exhaled air blown into the upper inlet 310, and sensor module Sb is a component for detecting exhaled air blown into the lower inlet 311. Sensor modules Sa and Sb are identical components, including a resin housing 35 and a substrate 36 mounted on the housing 35 by means of bonding, etc.

[0057] The housings 35 of sensor modules Sa and Sb each have a cylindrical section 350 through which exhaled air blown in from each inlet 310, 311 passes. The exhaled air passing through the cylindrical section 350 is controlled by a temperature sensor 360 (see reference 360) mounted on the substrate 36. Figure 4 The details of the breath test method will be described later.

[0058] On the inner circumferential surfaces of both ends of the exhaust side frame 33, bosses 333 for fixing a pair of sensor modules Sa and Sb are integrally formed. The bosses 333 are cylindrical protrusions that stand upright toward the blow-in side frame 32, and an insertion hole 333a for passing through a bolt B3 is formed at the center of the bosses 333.

[0059] The same insertion hole 361 is also formed at the end of the base plate 36 on the opposite side of the cylindrical portion 350 in the axial direction. On the inner peripheral surface of the blow-in side frame 32, a threaded hole 324 is formed at the position corresponding to the boss 333 (insertion hole 333a) (see reference). Figure 4 The sensor modules Sa and Sb are fixed inside the blow-in unit 3 by screwing the bolts B3, which are inserted into the insertion holes 333a and 361 of the boss 333 and the base plate 36, into the threaded holes 324 of the blow-in side frame 32.

[0060] In the fixed state, the cylindrical portions 350 of sensor modules Sa and Sb are connected to the first exhaust ports 334 of the exhaust-side frame 33. The first exhaust ports 334 are arranged in a pair, spaced apart axially (separated by bosses 332), and the exhaled air blown into each inlet 310, 311 is mainly discharged from the first exhaust ports 334. A pair of second exhaust ports 335 are formed on both sides of the pair of first exhaust ports 334 axially. Each exhaust port 334, 335 is a hole penetrating the large-diameter portion 330 of the exhaust-side frame 33; the first exhaust port 334 is circular, and the second exhaust port 335 is a rectangular shape that extends axially.

[0061] Each exhaust port 334, 335 is covered by a decorative body 37 (covering member) extending axially. The decorative body 37 includes a first covering portion 370 covering the first exhaust port 334, and a through hole 370a is formed in the first covering portion 370 at a position corresponding to the first exhaust port 334. A pair of second covering portions 371 covering a pair of second exhaust ports 335 are provided on both axial sides of the first covering portion 370, and a pair of third covering portions 372 are provided on both axial sides of the pair of second covering portions 371.

[0062] The third covering portion 372 covers the recess 333b formed on the outer peripheral surface of the exhaust side frame 33 through the boss 333 (see reference). Figure 4 In the third cover portion 372, a through hole 372a is formed at a position corresponding to the recess 333b. A pair of fixed portions 373 are provided on both axial sides of the pair of third cover portions 372, and the pair of fixed portions 373 are fixed to the outer peripheral surface of the exhaust side frame 33 (large diameter portion 330) by bolts (not shown).

[0063] The various parts 370-373 constituting these decorative bodies 37 are integrally formed using resin material. The various parts 370-373 of the decorative bodies 37 are used to cover the vents 334, 335 or the recesses 333b (see reference). Figure 4 ), which can enhance the appearance of the electronic wind instrument 1.

[0064] Next, refer to Figure 2 and Figure 3of (a) Figure 3 (b) describes the flow path of exhalation from each blow inlet 310, 311 to a pair of frame side flow paths 323. Figure 3 (a) is a three-dimensional view of the lip plate 31 as observed from the inner circumferential side. Figure 3 (b) is a partially enlarged cross-sectional view of the blowhole unit 3 (electronic wind instrument 1). Figure 3 In (b), a cross section is shown that is cut with a plane that is orthogonal to the direction of the exhalation of the performer into the inlet 310 and the inlet 311 (radial direction of the inlet side frame 32) and includes the isolation wall 313 of the lip plate 31.

[0065] also, Figure 3 (b) does not include each blow inlet 310, 311 or throttling wall 317a, throttling 317b (see reference). Figure 3 The cross-sectional view of (a) is shown, but... Figure 3 In (b), the positions of each inlet 310, 311 are shown in dashed lines. In the following description, the side of each inlet 310, 311 will be described as the upstream side of the exhalation flow path, and the opposite side will be described as the downstream side.

[0066] like Figure 2 and Figure 3 of (a) Figure 3 As shown in (b), a partition wall 313 dividing the exhalation flow path is integrally formed on the inner peripheral surface of the lip plate 31. The partition wall 313 is configured to be a wall-shaped structure rising from the inner peripheral surface of the lip plate 31, and the front end of the partition wall 313 ( Figure 3 The inner end of (b) in the vertical direction of the paper is in contact with the substrate 34. The space surrounded by the isolation wall 313 and the substrate 34 forms a first curved flow path 314a, a first curved flow path 314b, and a second curved flow path 315a and a second curved flow path 315b.

[0067] The first curved flow path 314a is on the axial side from the upper blowing inlet 310 to the side frame 32 ( Figure 3 (b) extends in a straight line to the left. The second curved flow path 315a extends from the downstream side of the first curved flow path 314a. Figure 3 The end of (b) on the left side is bent vertically (circumferentially toward the blow-in side frame 32), and the downstream portion of the second curved flow path 315a is connected to one of the pair of frame side flow paths 323.

[0068] The first curved flow path 314b is the axial flow path from the lower blowing inlet 311 to the other side of the blowing side frame 32. Figure 3 The flow path extends in a straight line from the right side of (b). The second curved flow path 315b extends from the downstream side of the first curved flow path 314b. Figure 3 The right end of (b) is bent vertically (in the circumferential direction of the blow-in side frame 32 and in the same direction as the second curved flow path 315a), and the downstream portion of the second curved flow path 315b is connected to another frame side flow path 323.

[0069] Additionally, a throttling flow path 316a is formed at the boundary between the first curved flow path 314a and the second curved flow path 315a (see reference). Figure 3 (a) A throttling flow path 316b is also formed at the boundary between the first curved flow path 314b and the second curved flow path 315b. These throttling flow paths 316a and 316b are formed by throttling walls 317a and 317b that connect the walls of the isolation wall 313 to each other.

[0070] Throttling walls 317a and 317b are walls that extend transversely to each of the curved flow paths 314a, 314b, 315a, and 315b. The height at which the throttling walls 317a and 317b are erected from the inner circumferential surface of the lip plate 31 is lower than the height at which the isolation wall 313 is erected. By forming the throttling walls 317a and 317b, throttling flow paths 316a and 316b with a flow path cross-sectional area smaller than each of the curved flow paths 314a, 314b, 315a, and 315b are formed.

[0071] like Figure 3 of (a) Figure 3 As shown by arrow A in (b), the exhaled air blown in from the upper inlet 310 passes through the first curved flow path 314a, the throttling flow path 316a, and the second curved flow path 315a and is guided into one of the frame side flow paths 323. On the other hand, as shown by arrow B, the exhaled air blown in from the lower inlet 311 passes through the first curved flow path 314b, the throttling flow path 316b, and the second curved flow path 315b and is guided into another frame side flow path 323.

[0072] Next, refer to Figure 3 of (a) Figure 3 (b) and Figure 4 The flow path of exhalation from the side flow path 323 of the frame to the first exhaust port 334 is described. Figure 4 yes Figure 3 (b) is a partially enlarged cross-sectional view of the inhalation inlet unit 3 at line IV-IV. Furthermore, a flow path further downstream than the frame-side flow path 323 is symmetrically formed on the sensor module Sa side and the sensor module Sb side. Therefore, in the following description, the exhalation flow path on the sensor module Sa side (refer to...) Figure 4 The description of the flow path on the Sb side of the sensor module is omitted.

[0073] like Figure 3 of (a) Figure 3 (b) and Figure 4 As shown, a cylindrical lower protrusion 325 is integrally formed on the inner circumferential surface of the blow-in side frame 32, opposite to the bottom surface 322a of the mounting hole 322 (see reference). Figure 4 A throttling flow path 326 connected to the frame side flow path 323 is formed on the inner circumference side of the lower protrusion 325, and a housing 35 for sensor modules Sa and Sb is installed on the lower protrusion 325.

[0074] The housing 35 includes the cylindrical portion 350 and an axial side extending from the cylindrical portion 350 toward the blow-in unit 3. Figure 4 The bottom wall portion 351 extending from the left side, and the side wall portion 352 and the end wall portion 353 standing from the bottom wall portion 351 are integrally formed. A fitting hole 354 for the lower protrusion 325 to be inserted and a shell side flow path 355 connected to the fitting hole 354 are formed on the inner circumferential side of the cylindrical portion 350.

[0075] The fitting hole 354 and the shell-side flow path 355 are both formed in circular cross-section. By forming the inner diameter of the shell-side flow path 355 to be smaller than the inner diameter of the fitting hole 354, a step is formed on the inner circumferential side of the cylindrical portion 350, and the lower protrusion 325 is embedded into the step portion.

[0076] With the lower protrusion 325 equipped with the cylindrical part 350, a flow path extending in a straight line in the radial direction (approximately parallel to the direction of exhalation blowing into each blow inlet 310, 311) is formed by the frame side flow path 323, the throttling flow path 326 and the shell side flow path 355.

[0077] Blow into the top inlet 310 (refer to) Figure 3 of (a) Figure 3 (b) The exhalation passes through the aforementioned curved flow paths 314a and 315a (regarding the first curved flow path 314a, refer to...). Figure 3 of (a) Figure 3 (b) The air is discharged from the first exhaust port 334 through the frame side flow path 323, the throttling flow path 326, and the shell side flow path 355. Hereinafter, these flow paths 314a, 315a, 323, 326, and 355 will be described together as the "mainstream flow path" of exhalation.

[0078] The bottom wall portion 351 of the housing 35 is formed as a flat plate extending axially along the inlet unit 3, and the side wall portion 352 extends in the width direction of the bottom wall portion 351. Figure 4 The two ends of the paper (vertical direction) form a pair (refer to) Figure 5(b)). The end wall portion 353 is formed as a wall that rises from the axial end of the bottom wall portion 351 (the end opposite to the cylindrical portion 350 side), and each of these wall portions 351 to 353 is formed as a box that is open on one side (the side of the blow-in side frame 32). The open portion is blocked by the substrate 36, and a branch flow path 356 surrounded by the substrate 36 and each of the wall portions 351 to 353 is formed in the housing 35.

[0079] The branch flow path 356 is a flow path extending axially along the inlet unit 3. In order to connect one end of it to the main flow path (shell-side flow path 355), an opening 356a (first opening) of the branch flow path 356 is formed on the inner circumferential surface of the shell-side flow path 355. That is, the branch flow path 356 branches in a manner that intersects with the shell-side flow path 355. In addition, the other end of the branch flow path 356 passes through an opening 356b (second opening) formed in the end wall portion 353 and connects to the outside of the shell 35.

[0080] On the inner surface of the substrate 36 facing the branch flow path 356, a temperature sensor 360 and a heater 362 are arranged axially (in the direction of the long side of the branch flow path 356). The temperature sensor 360 can be a known temperature sensor made of thermistor or the like, and the heater 362 can be a known heating element such as a chip resistor, so detailed description is omitted.

[0081] Air within the branch flow path 356 is heated by heater 362, and the flow of the heated air (temperature change within the branch flow path 356) is detected by temperature sensor 360. In this embodiment, with the housing-side flow path 355 positioned upstream of the branch flow path 356, the temperature sensor 360 is located further upstream than the heater 362; however, it can also be located further downstream than the heater 362. Alternatively, it can be positioned along the long side of the branch flow path 356 (…). Figure 4 The width direction (orthogonal to the left and right directions) Figure 4 Temperature sensor 360 and heater 362 are arranged on the paper (vertically).

[0082] When the flow rate (velocity) of exhaled air in the main flow path (shell-side flow path 355) changes, the airflow generated in the branch flow path 356 (a secondary flow path branching from the main flow path) also changes. The change in airflow in the branch flow path 356 (temperature change caused by the flow of air heated by the heater 362) is detected by the temperature sensor 360. A musical tone signal based on the detection result of the temperature sensor 360 is generated by a sound source, and an electronic sound based on the musical tone signal is emitted from an amplifier or speaker (neither shown).

[0083] In order to accurately detect the flow rate of exhaled air in the main flow path using the temperature sensor 360 based on changes in airflow in this branch flow path 356, it is necessary to prevent the accumulation of saliva contained in the exhaled air, or moisture generated by condensation of moisture contained in the exhaled air, in the main flow path or branch flow path 356. In particular, it is difficult to accurately detect the performer's exhaled air when such moisture adheres to the temperature sensor 360. The following describes the structure that solves these problems.

[0084] The openings 356a of the housing-side flow path 355 and the branch flow path 356 are each formed with a circular cross-section, but the diameter of the opening 356a of the branch flow path 356 is smaller than that of the housing-side flow path 355. That is, the cross-sectional area of ​​the opening 356a of the branch flow path 356 (the housing-side flow path 355) connected to the main flow path is smaller than that of the branch flow path 356. As a result, it is possible to prevent moisture-containing exhaled air from flowing into the temperature sensor 360 side disposed in the branch flow path 356.

[0085] One of the main reasons is that, because the opening 356a of the branch flow path 356 is relatively small, exhaled air passing through the shell-side flow path 355 does not easily flow into the branch flow path 356. Another main reason is that the exhaled air passing through the shell-side flow path 355 creates a negative pressure in the branch flow path 356, and due to this negative pressure, air in the branch flow path 356 is drawn from the opening 356a into the shell-side flow path 355.

[0086] By suppressing the inflow of humid exhaled air into the branch flow path 356, moisture generated by condensation or other factors can be prevented from adhering to the temperature sensor 360. Therefore, the flow rate (velocity) of exhaled air flowing in the main flow path can be accurately detected by the temperature sensor 360 based on changes in the airflow generated in the branch flow path 356.

[0087] Furthermore, a cylindrical protrusion 357 with a front end forming an opening 356a of a branch flow path 356 is integrally formed on the inner peripheral surface of the shell-side flow path 355. It can be considered that by utilizing the protrusion 357 to make the opening 356a of the branch flow path 356 protrude toward the inner peripheral side of the shell-side flow path 355, the effect of making it difficult for exhaled air containing moisture to flow into the branch flow path 356 side can be obtained, or the effect of easily generating negative pressure in the branch flow path 356 due to the exhaled air passing through the main flow path.

[0088] Furthermore, the front end of the protrusion 357 (the edge of the opening 356a of the branch flow path 356) is positioned on the extension line of the flow path of the throttling flow path 326. That is, when viewed in the direction of exhalation inflow from the throttling flow path 326 to the shell-side flow path 355 ( Figure 4When viewed from above and below, the throttling flow path 326 and the front end of the protrusion 357 are positioned in an overlapping position. It can be assumed that this also allows for the generation of negative pressure in the branch flow path 356 due to the exhalation passing through the main flow path.

[0089] Thus, this embodiment is a structure that detects exhaled air flowing into the branch flow path 356 from the small cross-sectional area opening 356a using a temperature sensor 360, or a structure that detects the airflow in the branch flow path 356 caused by negative pressure generated in the branch flow path 356 due to exhaled air passing through the housing-side flow path 355 using a temperature sensor 360. In this structure, the change in airflow generated in the branch flow path 356 becomes relatively small. Here, as shown in this embodiment, if the structure detects the temperature change of the air in the branch flow path 356 heated by the heater 362 using a temperature sensor 360, then even the minute changes in airflow generated in the branch flow path 356 can be detected by the temperature sensor 360. Therefore, the flow rate of exhaled air flowing in the main flow path can be detected with good accuracy.

[0090] Furthermore, since sensor modules Sa and Sb are arranged axially with the cylindrical portion 350 facing each other (see reference...), Figure 2 The branch flow path 356 is formed along the axial direction (long side direction) of the inhalation unit 3, so the branch flow path 356 for sensing exhalation can be made long. As a result, while each tube 350 is close to the lip plate 31 and the appearance of a slender flute (head tube) is simulated by the inhalation unit 3, the changes in airflow within the branch flow path 356 can be detected with good accuracy by the temperature sensor 360.

[0091] Furthermore, in this embodiment, different sensor modules Sa and Sb are used to detect the exhaled air blown into the upper inlet 310 and the exhaled air blown into the lower inlet 311 (see reference). Figure 2 That is, since the two branch flow paths 356 are not formed in one housing 35, but rather the two housings 35 are formed individually as different parts (to miniaturize the housings 35), the shape of the branch flow paths 356 can be formed with good precision. Therefore, the airflow generated in the branch flow paths 356 can be detected with good precision by the temperature sensor 360.

[0092] Thus, in this embodiment, exhalation detection is performed based on the airflow generated in the branch flow path 356, and a conical surface 356c for stabilizing the airflow is formed in the branch flow path 356. The conical surface 356c is an inclined surface connected to one end (the end on the opening 356a side) of the inner surface of the bottom wall portion 351 or the side wall portion 352 of the housing 35 (regarding the connection between the conical surface 356c and the side wall portion 352, refer to...). Figure 5 (b) By forming this conical surface 356c, the cross-sectional area of ​​the branch flow path 356 can be formed to gradually decrease towards the opening 356a. As a result, irregular airflow (turbulence) can be suppressed within the branch flow path 356, and the flow rate of exhaled air flowing in the main flow path can be detected with good accuracy by the temperature sensor 360.

[0093] Furthermore, a vent 333c is formed on the side of the boss 333 facing the end wall portion 353 of the housing 35. The recess 333b formed on the outer peripheral surface of the exhaust side frame 33 by the boss 333 is connected to the opening 356b of the branch flow path 356 via the vent 333c. Thus, the airflow passing through the vent 333c and the opening 356b can be used to ventilate the interior of the branch flow path 356, thereby suppressing condensation in the temperature sensor 360.

[0094] Furthermore, by utilizing the bosses 333 (recesses 333b) for fixing the sensor modules Sa and Sb to perform ventilation of the branch flow path 356, it is not necessary to separately provide holes or recesses for ventilation in the exhaust side frame 33. Therefore, the number of holes or recesses formed in the exhaust side frame 33 can be reduced, thereby improving the appearance of the electronic wind instrument 1.

[0095] Here, for example, when a performer takes a breath during a performance, they sometimes blow air from the upper inlet 310 (see reference). Figure 3 of (a) Figure 3 (b) Air is drawn in. Additionally, for example, if the performer performs an action with the upper inlet 310 out of their mouth, external air may sometimes flow in through the upper inlet 310 due to the accompanying movement of the electronic wind instrument 1. When the temperature sensor 360 detects this airflow accompanying the drawing in or the inflow of external air, a problem arises where unwanted musical sounds are generated.

[0096] Furthermore, when the performer forcefully blows exhaled air into the inlet 310, the flow rate of the exhaled air sometimes exceeds the measurable range of the temperature sensor 360. Outside the measurable range of the temperature sensor 360, even changing the flow rate of the exhaled air does not alter the generated musical tone, thus creating a problem where the performer finds it difficult to produce the desired musical tone.

[0097] In contrast, in this embodiment, as described above, a first curved flow path 314a is formed on the lip plate 31 extending in a direction orthogonal to the blowing direction of the exhalation upward blowing inlet 310 (in this embodiment, the axial direction of the blowing inlet unit 3) (see reference). Figure 3 of (a) Figure 3 (b) Furthermore, the second curved flow path 315a, connected to the downstream side of the first curved flow path 314a, extends in a direction that bends further from the connecting portion (in this embodiment, a direction orthogonal to the exhalation blowing direction and the axial direction of the blowing inlet unit 3).

[0098] By forming such a curved flow path on the upstream side of the main flow path, for example, compared to the case where the upward blowing inlet 310 and the frame side flow path 323 are connected in a straight line, even if the player inhales or external air flows in as described above, the airflow generated in the housing side flow path 355 can be suppressed.

[0099] Furthermore, at the boundary portions of these curved flow paths 314a and 315a, throttling flow paths 316a with a flow path cross-sectional area smaller than that of each curved flow path 314a and 315a are formed (see reference). Figure 3 (a) Furthermore, a throttling flow path 326 with a smaller flow path cross-sectional area than these flow paths 323 and 355 is also formed between the frame-side flow path 323 and the housing-side flow path 355. By providing a throttling section in the middle of the main flow path (more upstream than the connection part of the branch flow path 356) to partially reduce the cross-sectional area of ​​this main flow path, the airflow generated in the housing-side flow path 355 accompanying the inhalation of the performer or the inflow of external air as described above can also be suppressed.

[0100] By suppressing the airflow generated in the housing-side flow path 355 that accompanies the performer's inhalation or the inflow of external air, the temperature sensor 360 can be prevented from falsely detecting the airflow. Therefore, the generation of unwanted musical sounds by the performer can be suppressed.

[0101] Furthermore, by adjusting the flow path lengths of each curved flow path 314a and 315a, or adjusting the flow path cross-sectional area of ​​the throttling flow path 316a and throttling flow path 326, it is possible to prevent the exhaled air forcefully blown into the upward blowing inlet 310 by the performer from exceeding the measurable range of the temperature sensor 360. Therefore, it is easier to generate the musical tone desired by the performer.

[0102] Thus, by incorporating curved or throttling sections into the main flow path, it is easy to generate the musical tone desired by the performer. On the other hand, if the main flow path is complexly constructed, saliva contained in the exhaled breath, or moisture generated due to condensation, can easily accumulate in the main flow path. When this moisture, for example, the opening 356a of the throttling flow path 326 or the branch flow path 356, becomes blocked, it becomes difficult to detect the exhaled breath blown in from each of the inlets 310, 311 using the temperature sensor 360.

[0103] Therefore, in this embodiment, a structure is adopted in which moisture is dried (to avoid condensation) by heating the upstream portion of the main flow using the substrate 34. Regarding this structure, see [reference needed]. Figure 4 and Figure 5 of (a) Figure 5 (b) will be explained.

[0104] Figure 5 (a) is Figure 4 A cross-sectional view of the blow-in unit 3 at the Va-Va line. Figure 5 (b) is Figure 4 A cross-sectional view of the blow-in unit 3 at the Vb-Vb line.

[0105] like Figure 4 and Figure 5 of (a) Figure 5 As shown in (b), a heater 341 and a sensor 342 are provided on the substrate 34 (both refer to...). Figure 5 (a) The heater 341 can use a known heating element such as a chip resistor, and the sensor 342 can use a known temperature sensor made of a thermistor, so detailed descriptions are omitted.

[0106] The temperature of the substrate 34, which is heated by the heater 341, is detected by the sensor 342, and the heater 341 is controlled by repeatedly turning on and off (or changing the temperature of the heater 341) based on the detection results of the sensor 342. Through the control of the heater 341, the temperature of the substrate 34 is maintained at about 30°C to 35°C.

[0107] By heating the substrate 34 that forms the bottom surface of each curved flow path 314a, 315a using the heater 341, the saliva adhering to each curved flow path 314a, 315a can be dried, and the moisture caused by condensation in each curved flow path 314a, 315a can be suppressed.

[0108] Furthermore, by heating the substrate 34 using the heater 341, the frame-side flow path 323 connected to the second curved flow path 315a, or the throttling flow path 326 located downstream of the frame-side flow path 323, can also be heated. Therefore, saliva adhering to the frame-side flow path 323 or the throttling flow path 326 can be dried, and moisture caused by condensation in the frame-side flow path 323 or the throttling flow path 326 can be suppressed.

[0109] By suppressing the accumulation of moisture in the throttling flow path 326, or the opening 356a of the branch flow path 356 (see reference). Figure 4 In the upstream main flow path, the flow of moisture along with exhaled air can be suppressed to flow downstream. This prevents the opening 356a of the throttling flow path 326 or the branch flow path 356 from becoming blocked by moisture, thus allowing the temperature sensor 360 (see reference) to detect the flow. Figure 4 It can accurately detect the exhaled air flowing in the main flow path.

[0110] Here, in this embodiment, the exhaled air flowing in the main flow path is mainly discharged from the first exhaust port 334, but a portion of the exhaled air passes through the leakage flow path 322b (see reference). Figure 5 (a) is imported into the internal space S1 of each frame 32, 33.

[0111] More specifically, the frame-side flow path 323 opens midway through the second curved flow path 315a, and a leakage flow path 322b is formed in the mounting hole 322 for mounting the lip plate 31, connecting the downstream end of the second curved flow path 315a to the internal space S1 side of each frame 32, 33 (see reference). Figure 5 (a)). The leakage flow path 322b is formed by the gap between the edge of the substrate 34 in the circumferential direction of the blow-in side frame 32 and the inner circumferential surface of the blow-in side frame 32.

[0112] By forming this leakage flow path 322b branching from the main flow path, a portion of the airflow generated in the second curved flow path 315a can be directed to the internal space S1 side of the inlet unit 3 (i.e., a portion of the airflow is discharged to the outside of the main flow path). This suppresses the airflow generated in the housing-side flow path 355 accompanying the player's inhalation or the inflow of external air as described above, thus suppressing the temperature sensor 360 (see reference). Figure 4 This prevents the false detection of the airflow. Therefore, it can suppress the generation of unwanted musical sounds by the performer.

[0113] Furthermore, by adjusting the flow path cross-sectional area of ​​the leakage flow path 322b, it is possible to prevent the exhaled air forcefully blown into the upward blowing inlet 310 by the performer from exceeding the measurable range of the temperature sensor 360. Therefore, it is easier to generate the musical tone desired by the performer.

[0114] Exhaled air flowing from the leakage flow path 322b into the internal space S1 side of each frame 32, 33 exits through the second exhaust port 335 of the exhaust-side frame 33 (see reference). Figure 5 (b)) Exhaust. The second covering portion 371 of the decorative body 37 covering the second exhaust port 335 is formed in such a way that it is positioned between the first covering portion 370 and the third covering portion 372 (extending axially) (see reference). Figure 4 A cavity S2 is formed between the exhaust side frame 33 (second exhaust port 335) and the second cover portion 371 (see reference). Figure 5 (b)

[0115] Therefore, even when the electronic wind instrument 1 is placed on a table, the blockage of the second exhaust port 335 by the mounting surface can be prevented, thereby ensuring ventilation through the cavity S2 and the second exhaust port 335. Thus, even if a portion of the exhaled air passes through the leakage path 322b (see reference...) Figure 5 The structure that leaks into the internal space S1 of each frame 32, 33 (a) can also suppress the leakage of parts (e.g., in each frame 32, 33) into the internal space S1 of each frame 32, 33. Figure 5 Condensation occurs on substrate 36 shown in (b).

[0116] Additionally, a pair of circumferentially arranged inclined surfaces 371a are formed on the inner peripheral surface of the second cover portion 371 facing the second exhaust port 335 (see reference). Figure 5 (b)). A pair of inclined surfaces 371a are planes inclined from their circumferential central apex (intersecting edges) to their circumferentially outer ends away from the exhaust side frame 33 (second exhaust port 335). By forming this mountain-shaped inclined surface 371a, along the circumferential ( Figure 5 The air velocity passing through the cavity S2 in the left-right direction (b) is increased by the inclined surface 371a. As the air velocity increases, a negative pressure is generated in the internal space S1 of each frame 32, 33, and the air in the internal space S1 can be discharged to the outside through the second exhaust port 335 by the negative pressure.

[0117] Furthermore, since the circumferential opening size of the second exhaust port 335 gradually increases from the inner space S1 to the outer peripheral surface of the exhaust side frame 33, the air in the inner space S1 can easily be discharged to the outside from the second exhaust port 335 using the airflow passing through the cavity S2 as described above. Therefore, even if a portion of the exhaled air passes through the leakage flow path 322b (see reference...) Figure 5 The structure that leaks into the internal space S1 of each frame 32, 33 (a) can also suppress condensation on the parts of each frame 32, 33.

[0118] Additionally, as described above, the first exhaust port 334 or the boss 333 (see reference) is covered. Figure 4The decorative body 37 of the recess 333b (vent 333c) has through holes 370a and 372 formed in each of the covering portions 370 and 372 (regarding through hole 372a, refer to...). Figure 4 For example, recesses 370b are formed on both circumferential edges of the through hole 370a. Additionally, in Figure 4 The edge of the through hole 372a shown also has the same recess 372b.

[0119] By forming these recesses 370b and 372b in the through holes 370a and 372a, even when the electronic wind instrument 1 is placed on a table, the blockage of the first exhaust port 334 or the recess 333b (vent 333c) by the mounting surface can be prevented. Therefore, ventilation through the first exhaust port 334 or the recess 333b (vent 333c) can be ensured.

[0120] Then, referring to Figure 6 The electronic wind instrument 201 according to the second embodiment will be described. In the first embodiment, the case where the temperature change of the air in the branch flow path 356 heated by the heater 362 is detected by the temperature sensor 360 was described. However, in the second embodiment, the case where the change of airflow (air pressure) in the branch flow path 380 is detected by the pressure sensor 363 will be described. In addition, the same reference numerals are used for the parts that are the same as in the first embodiment, and their descriptions are omitted.

[0121] like Figure 6 As shown, in the sensor module Sa of the electronic wind instrument 201 of the second embodiment, the temperature sensor 360 and heater 362 described in the first embodiment are replaced (see Figure 1). Figure 4 A pressure sensor 363 is provided to replace the walls 351-353 of the housing 35 (see reference). Figure 4 A cylindrical conduit 38 is provided. The pressure sensor 363 is a sensor that detects changes in air pressure, and a known structure can be used, so detailed description is omitted.

[0122] A pressure sensor 363 is mounted on the upper surface of the substrate 36, and a cylindrical connection port 363a is formed on the pressure sensor 363. One end of a conduit 38 is connected to the connection port 363a, and the other end of the conduit 38 is connected to the cylindrical portion 350 of the housing 35. Furthermore, the conduit 38 may be integrally formed with the housing 35 (cylindrical portion 350), or it may be a separate tube (e.g., a flexible tube) from the housing 35.

[0123] The internal cavity of the conduit 38 is configured as a branch flow path 380, and the opening 380a of the branch flow path 380 is formed on the inner circumferential surface of the cylindrical portion 350 (the secondary flow path 355). That is, in this embodiment, the branch flow path 380 also branches in a manner that intersects with the housing-side flow path 355. When the flow rate (velocity) of expiratory air flowing in the main flow path (the housing-side flow path 355) changes, the airflow generated in the branch flow path 380 (the secondary flow path branching from the main flow path) also changes, and the change in airflow (pressure) in the branch flow path 380 is detected by the pressure sensor 363.

[0124] In this embodiment, the cross-sectional area of ​​the opening 380a of the branch flow path 380 is also smaller than that of the portion (housing-side flow path 355) connecting to the opening 380a of the branch flow path 380 in the main flow path. This results in the effect that exhaled air containing moisture is less likely to flow into the pressure sensor 363 side. As a factor in achieving this effect, the reduced flow of exhaled air through the housing-side flow path 355 into the branch flow path 380 side is considered, or the generation of negative pressure in the branch flow path 380 due to the exhaled air passing through the housing-side flow path 355, through which air in the branch flow path 380 is drawn from the opening 380a into the housing-side flow path 355.

[0125] The above description is based on the embodiments described, but the present invention is not limited to any of the embodiments described, and it is easy to deduce that various modifications and variations can be made without departing from the spirit of the present invention.

[0126] In the embodiments described above, the electronic wind instrument 1 and electronic wind instrument 201 are described as electronic instruments that imitate the flute, but they are not necessarily limited to this. For example, the electronic wind instrument 1 and electronic wind instrument 201 may imitate other wind instruments (saxophone, clarinet, recorder, hulusi, etc.).

[0127] In the various embodiments described, the structure of heating each curved flow path 314a and 315a using a heater 341, i.e., the structure of providing a substrate 34 on the bottom surface 322a of the mounting hole 322 of the lip plate 31, has been described, but it is not necessarily limited to this. For example, the substrate 34 (heater 341) may be provided on the inner peripheral surface of the blow-in side frame 32 opposite to the bottom surface 322a, or the substrate 34 (heater 341) may be omitted. Alternatively, a substrate (heater) may be provided to heat the housing side flow path 355.

[0128] In the various embodiments described, the main flow path includes a first curved flow path 314a, a second curved flow path 315a, a frame-side flow path 323, a throttling flow path 326, and a housing-side flow path 355, but this is not a limitation. For example, additional flow paths may be added to some or all of the connecting portions of these flow paths 314a, 315a, 323, 326, and 355, or a portion of each flow path 314a, 315a, 323, 326, and 355 may be curved. That is, the present invention is applicable to electronic wind instruments where the shape of the main flow path connecting each blowhole 310, 311 to the first exhaust port 334 can be arbitrarily changed, and includes at least branch flow paths that branch in a manner intersecting with the main flow path.

[0129] In the various embodiments described, the case where the housing-side flow path 355, which is part of the main flow path, is formed by the housing 35 of the sensor modules Sa and Sb (sensor modules Sa and Sb include a part of the main flow path) has been described, but it is not necessarily limited to this. For example, based on the housing-side flow path 355, the sensor modules Sa and Sb may also include part or all of the first curved flow path 314a, the second curved flow path 315a, the frame-side flow path 323, and the throttling flow path 326. That is, the lip plate 31 forming the main flow path, a part of the blow-in side frame 32 (e.g., mounting hole 322 or lower protrusion 325), and a part or all of the substrate 34 may be set as constituent parts of the sensor modules Sa and Sb.

[0130] In the various embodiments described, the case where a first curved flow path 314a, a first curved flow path 314b, and second curved flow paths 315a and 315b are formed on the lip plate 31 has been described, but this is not necessarily the case. For example, any one of the first curved flow paths 314a, 314b, 315a, and 315b may be omitted, and each blow-in port 310, 311 may be connected to the frame side flow path 323 via another curved flow path. Alternatively, both the first curved flow paths 314a, 314b, 315a, and 315b may be omitted, and each blow-in port 310, 311 may be connected to the frame side flow path 323 in a straight line.

[0131] In the various embodiments described, the cases in which throttling flow paths 316a and 326 are formed in the middle of each curved flow path 314a and 315a, or between the frame-side flow path 323 and the housing-side flow path 355 (i.e., the main flow path upstream of the branch flow path), have been described, but this is not a limitation. For example, either or both of the throttling flow path 316a and 326 may be omitted, and the throttling flow path may also be formed in the housing-side flow path 355 (i.e., in the housing 35).

[0132] In the various embodiments described, the case in which a leakage flow path 322b is formed in the second curved flow path 315a (the main flow path upstream of the branch flow path) is explained, but it is not necessarily limited to this. For example, the structure that omits the leakage flow path 322b (which blocks the gap between the substrate 34 and the blow-in side frame 32) may be used, or a flow path equivalent to the leakage flow path 322b may be formed in other parts of the main flow path.

[0133] In the various embodiments described, the case where a first exhaust port 334 and a second exhaust port 335 are formed in the exhaust-side frame 33 has been explained, but it is not necessarily limited to this. For example, an exhaust port equivalent to the first exhaust port 334 (i.e., an exhaust port for exhausting the exhaled air of the main flow path) may be formed in the inlet-side frame 32, or the second exhaust port 335 may be omitted (or an exhaust port for exchanging air in the internal space S1 of each frame 32, 33 may be formed in the inlet-side frame 32 based on the second exhaust port).

[0134] In the various embodiments described, the circumferential opening size of the second exhaust port 335 is described as expanding toward the outer periphery, but this is not necessarily the case. For example, the circumferential opening size of the second exhaust port 335 may be constant from the inner periphery to the outer periphery, or it may become narrower from the inner periphery to the outer periphery.

[0135] In the various embodiments described, the case in which each exhaust port 334, 335 or recess 333b is covered by a decorative body 37 having the first covering portion 370 to the third covering portion 372 integrally formed, is described, but it is not necessarily limited to this. For example, the first covering portion 370 to the third covering portion 372 may be formed separately, or part or all of the first covering portion 370 to the third covering portion 372 may be omitted.

[0136] In the various embodiments described, the second exhaust port 335 is covered by a second covering portion 371 extending axially, but this is not a limitation. For example, similar to the first covering portion 370 or the third covering portion 372, the second exhaust port 335 may be covered by a covering portion having a through hole extending radially, or the first exhaust port 334 or the recess 333b may be covered by a covering portion extending axially.

[0137] In the embodiments described above, a pair of inclined surfaces 371a are formed on the inner peripheral surface of the second covering portion 371 in a manner arranged with spacer ridges, but this is not necessarily the case. For example, a plane or a buckled surface may be formed at the boundary between the pair of inclined surfaces 371a, and the inner peripheral surface of the second covering portion 371 may also be a plane.

[0138] In each of the embodiments, bolts are used to secure the components constituting the electronic wind instrument 1 to each other, but other screws or fasteners may also be used.

[0139] In the first embodiment, the case where a protrusion 357 is formed on the inner peripheral surface of the housing-side flow path 355 (main flow path) has been described, but it is not necessarily limited to this. For example, the protrusion 357 may be omitted, and the opening 356a of the branch flow path 356 may be formed on the inner peripheral surface of the housing-side flow path 355. Alternatively, in the second embodiment, a protrusion 357 connected to the conduit 38 (branch flow path 380) may be formed on the inner peripheral surface of the housing-side flow path 355.

[0140] In the first embodiment, the case where a tapered surface 356c is formed in the branch flow path 356 has been described, but it is not necessarily limited to this. For example, the tapered surface 356c may be omitted, the cross-sectional area of ​​the branch flow path 356 may be constant throughout both ends of the axial direction, or the same surface as the tapered surface 356c may be formed on the side of the opening 356b.

[0141] In the first embodiment, the case where a vent 333c is formed in the boss 333 (recess 333b) to connect the opening 356b of the branch flow path 356 to the outside has been described, but it is not limited to this. For example, the opening 356b of the branch flow path 356 may also be connected to the outside via a vent (exhaust port) provided in a different part from the boss 333 (recess 333b).

Claims

1. A sensor module for an electronic wind instrument, characterized in that... include: The main airway is formed between the exhalation inlet and the exhaust outlet located on the outer surface of the frame of the electronic wind instrument. Branch paths branch in a manner that intersects with the main path; A sensor is installed in the branch flow path to detect changes in airflow in the branch flow path caused by changes in the exhaled airflow in the main flow path. Compared to the cross-sectional area of ​​the main flow path at the connection between the main flow path and the branch flow path, the cross-sectional area of ​​the first opening of the branch flow path formed at the connection is smaller.

2. The sensor module for an electronic wind instrument according to claim 1, characterized in that, A protrusion is formed on the inner peripheral surface of the main channel, protruding toward the inner peripheral side of the main channel. The first opening is formed on the front end side of the protrusion, and The main flow path includes a throttling flow path, which is formed upstream of the connecting portion and is formed by partially reducing the cross-sectional area of ​​the main flow path. The front end of the protrusion is located on the extension line of the throttling flow path.

3. The sensor module for an electronic wind instrument according to claim 1, characterized in that, Includes a heater, which is disposed within the branch flow path. The sensor detects the temperature change within the branch flow path after it has been heated by the heater, and the cross-sectional area of ​​the branch flow path gradually decreases from the sensor side toward the first opening side.

4. An electronic wind instrument, characterized in that, The frame includes an air inlet and an air outlet formed on its outer surface. The sensor module according to claim 1 is disposed within the frame.

5. The electronic wind instrument according to claim 4, characterized in that, A recess for fastening the fastening member is formed on the outer surface of the frame. A second opening for the branch flow path is formed on the inner circumferential side of the recess.

6. The electronic wind instrument according to claim 4, characterized in that, The main flow path includes a throttling flow path, which is formed on the upstream side of the connecting portion and is formed by partially reducing the cross-sectional area of ​​the main flow path.

7. The electronic wind instrument according to claim 4, characterized in that, The main flow path includes a curved flow path formed upstream of the connecting portion, which is curved relative to the direction of exhalation towards the inlet.

8. The electronic wind instrument according to claim 4, characterized in that, This includes a leakage flow path that branches off from the main flow path further upstream than the connection portion. A portion of the exhaled air flowing in the main flow path is introduced into the frame through the leakage flow path.

9. The electronic wind instrument according to claim 8, characterized in that, The exhaust port includes at least: a first exhaust port for discharging exhaled air flowing downstream of the connection portion to the outside of the frame; and a second exhaust port for discharging exhaled air introduced into the frame from the leakage path to the outside of the frame.

10. A method for detecting exhalation, specifically for detecting exhalation in an electronic wind instrument, the electronic wind instrument comprising: The frame has an air inlet and an air outlet formed on its outer surface; The main flow path is formed between the air inlet and the exhaust outlet of the frame; Branch paths branch in a manner that intersects with the main path; The method for detecting exhalation, characterized by the presence of a sensor disposed in the branch flow path, is as follows: Compared to the cross-sectional area of ​​the main flow path at the connection between the main flow path and the branch flow path, the cross-sectional area of ​​the first opening of the branch flow path formed at the connection is reduced, and the sensor detects the change in airflow in the branch flow path caused by the change in exhaled air flowing in the main flow path.

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