JP5946626B2 - Harmonica / keyboard harmonica tuning method and manufacturing method thereof - Google Patents

Description

The present invention relates to a tuning method for harmonica and keyboard harmonica and a method for manufacturing the same , and in particular, a method for tuning a lead using a laser beam, and has been tuned to a predetermined pitch by such a tuning method. The present invention relates to a harmonica using a lead and a method for manufacturing a keyboard harmonica.

  The basic structure of the harmonica is, for example, as disclosed in Patent Document 1, a harmonica body in which a plurality of sound holes are provided in parallel, and an upper and lower surface of the harmonica body. A pair of lead holding plates having through holes that communicate with each other and a position suitable for vibration with respect to the through holes of the lead holding plate, with the distal end being a free end and the proximal end being a fixed end. A structure including a plurality of leads and a pair of covers arranged above the lead holding plate is known.

  The leads arranged in the plurality of sound holes vibrate by either sound absorption or blowing sound, and sound of a predetermined scale is generated. Each lead is tuned so that a sound of a predetermined scale is generated.

  Conventionally, this tuning method has been performed by manually scraping a part of the lead with a file or scraping.

  FIG. 11 shows a conventional manual tuning example for the lead 1 for harmonica. The lead 1 has a fixing part 1a and a lead body 1b integrally formed at one end of the fixing part 1a. The fixing portion 1a is formed in a substantially square shape, and a fixing point 1c that is spot-welded to a holding plate (not shown) is formed at the center thereof. The lead body 1b is formed in a rectangular shape whose width is narrower than that of the fixing portion 1a. In the lead 1 having such a structure, when tuning to a predetermined pitch, if the pitch is to be increased, a part 1d on the distal end side of the lead body 1b is scraped off, and the pitch is decreased on the proximal end side. This is done by scraping off part 1e.

   However, the conventional tuning method has technical problems described below.

JP 2000-66662 A

That is, if the conventional tuning method scratches the position of the part 1e on the base end side, the durability of the lead 1 is deteriorated. There was a problem that it was easy to break from the shaved part on the side.
Further, in the manual tuning, it is necessary to fix the lead 1 in a state where it is raised by a spatula or the like, which requires skill and time.
In addition, when scraping with a file, etc., burrs may occur around the lead 1, and if left as it is, it will touch the support plate and no sound will be produced or the sound quality will change. There was a problem that was necessary.

The present invention was made in view of such conventional problems, and an object, using a laser beam, tuning method does not degrade the durability of the harmonica and keyboard harmonica leads and thus It is an object of the present invention to provide a harmonica having a lead whose pitch is tuned by various tuning methods and a method for manufacturing a keyboard harmonica.

  In order to achieve the above object, the present invention comprises a lead main body part and a fixing part integrally formed on one end of the lead main body part, and is tuned so as to generate a sound of a predetermined scale. In a tuning method for a harmonica or a keyboard harmonica having a lead, the surface of the fixed part is irradiated with a laser beam to form a melting / evaporating part on the surface of the fixed part, thereby lowering the pitch and obtaining a predetermined pitch. I tuned like that.

The fixing part has a fixing point for fixing the lead to the holding plate, and a wide part provided on the outer periphery of the fixing point and wider than the lead main body part. The wide portion can be formed.

The present invention also provides a harmonica having a lead body part and a lead part integrally formed at one end of the lead body part, and having a lead tuned to generate a sound of a predetermined scale, and a fixing part to a holding plate. In the keyboard harmonica, the surface of the fixed part is irradiated with a laser beam to form a melting / evaporating part on the surface of the fixed part, thereby lowering the pitch and tuning to a predetermined pitch.

The fixing part has a fixing point for fixing the lead to the holding plate, and a wide part provided on the outer periphery of the fixing point and wider than the lead main body part. The wide portion can be formed.

  According to the tuning method according to claim 1 of the present invention, quantitative cutting (formation of a melting / evaporating part) is possible without impairing the durability of the lead. For example, tuning can be performed in units of 1 cent. Become. Furthermore, unlike the manual tuning, it is not necessary to fix the lead with a spatula, and no burr is generated around the lead.

According to the method of manufacturing the harmonica and the keyboard harmonica according to claim 3 of the present invention, quantitative cutting (formation of a melting / evaporating part) is possible without impairing the durability of the lead, and the durability is excellent. Can produce harmonica and keyboard harmonica with high-precision pitch.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. FIGS. 1-7 has shown the Example at the time of applying the tuning method based on this invention to the lead of harmonica called a 10-hole harmonica.

  The harmonica 10 shown in these drawings includes a generally rectangular harmonica body 12, a pair of flat upper and lower lead holding plates 14, 16, and a pair of generally flat upper and lower covers 18, 20. And.

  The harmonica main body 12 is provided with a plurality of sound holes 12a in a parallel state, and each sound hole 12a is individually defined by a cut plate 12b.

  The upper lead holding plate 14 is a single plate having substantially the same width and length as the harmonica main body 12 and is disposed on the upper surface side of the harmonica main body 12 and is fixed to the main body 12 with a plurality of screws.

  The upper lead holding plate 14 is provided with through holes 14a that individually communicate with the sound holes 12a. An upper lead 22 is disposed in the through hole 14a. The upper lead 22 is disposed at a position suitable for vibration with respect to the through hole 14a of the upper lead holding plate 14 so that the distal end side is a free end and the proximal end side is a fixed end.

  The lower lead holding plate 16 is a single plate having substantially the same width and length as the harmonica main body 12, and is disposed on the lower surface side of the harmonica main body 12, and is fixed to the main body 12 with a plurality of screws.

  Further, the lower lead holding plate 16 has through holes 16a communicating with the sound holes 12a individually. A lower lead 24 is disposed in the through hole 16a. The lower lead 24 is disposed at a position suitable for vibration with respect to the through hole 16a of the lower lead holding plate 16 so that the distal end side is a free end and the proximal end side is a fixed end.

  The upper cover 18 is mounted and disposed above the upper lead holding plate 14, and the lower cover 20 is mounted and disposed below the lower lead holding plate 16.

  In the harmonica 10 configured as described above, sound is generated by a mechanism as shown in FIGS. First, as shown in FIG. 3, the harmonica 10 generates sound when air flows from the lead 22 side toward the lead holding plate 14 side, and conversely, when it flows from the lead holding plate 14 side to the lead 22 side. It has a basic structure that does not pronounce.

  That is, when breathing into the sound hole 12a of the harmonica 10, as shown in FIG. 4, the upper lead 22 produces a sound, and when breathing in from the sound hole 12a, as shown in FIG. 5, the lower lead 24 Will be pronounced.

  FIG. 6 illustrates the shapes of the leads 22 and 24 used in the harmonica 10 of this embodiment. Each of the leads 22 and 24 shown in these figures has a form in which a flat plate made of a copper alloy such as phosphor bronze or brass is cut into a shape having a predetermined thickness.

  The leads 22 and 24 of this embodiment have integrally formed fixing portions 22a and 24a and lead main body portions 22b and 24b. The fixing portions 22a and 24a are formed in a substantially square shape, and fixing points 22c and 24c to the holding plates 14 and 16 are formed at the centers thereof. The lead main body portions 22b and 24b are formed in a rectangular shape having a narrower width and a smaller thickness than the fixing portions 22a and 24a. Such leads 22, 24 are fixed at the center of the fixing portions 22 a, 24 a in the vicinity of the through holes 14 a, 16 a of the lead holding plates 14, 16 by spot welding, riveting, or caulking to form a cantilever shape. Is provided.

  FIG. 7 shows a specific example of the tuning method of this embodiment using a laser beam. Each of the leads 22 and 24 is tuned to have a predetermined pitch by irradiating the surface thereof with a laser beam to form melting / evaporating portions 30c and 30d as irradiation portions.

  When tuning the pitch with the leads 22 and 24, when increasing the pitch, the melting / evaporating part 30c is provided on the tip side of the lead main body parts 22b and 24b, and the pitch of the leads 22 and 24 is lowered. The melting / evaporating part 30d is provided in the fixing parts 22a, 24a of the leads 22, 24. The melting / evaporating part 30d shown in FIG. 7 is on the side of the lead bodies 22b, 24b of the fixing parts 22a, 24a and has a rectangular shape with substantially the same width.

  The shape of the melting / evaporating part 30d can be arbitrarily set. For example, a modification thereof is illustrated in FIGS. 10 (A) and 10 (B). FIG. 10A shows an example in which the melting / evaporating part 30d is formed so as to surround the outer periphery of the fixing points 22c, 24c. FIG. 10B shows an example in which the melting / evaporating part 30d is formed so as to surround the entire circumference of the fixing points 22c, 24c.

  FIG. 8 shows an example of a processing state when the leads 22 and 24 are tuned. In the tuning processing method shown in the figure, the lead holding plates 14 and 16 (not shown) are held by an appropriate jig, and the surfaces of the leads 22 and 24 to be tuned are irradiated with a laser beam.

  Then, by irradiating the laser beam, the melting / evaporating portions 30c and 30d are formed on the surfaces of the leads 22 and 24 so as to be tuned to have a predetermined pitch. As shown in FIG. 8, the leads 22 and 24, which are tuned to form the melting / evaporating sections 30c and 30d, are vibrated by means such as a blower (not shown) to generate sound, which is collected by a microphone. Then, after converting it to an electrical signal, it is analyzed by applying it to an FFT analyzer to confirm that it has a predetermined pitch. Note that the tuning confirmation means is not limited to that shown in this embodiment, and may be a pitch measuring device or a frequency measuring device having another configuration.

  For the wavelength of the laser beam, a wavelength suitable for the constituent material of the lead is used. For example, when the lead material is a copper alloy such as phosphor bronze or brass, a laser beam having a wavelength of 600 nm or less, in particular, a laser beam having a wavelength of 532 nm of a commercially available laser called a green laser is phosphor bronze or brass. Because of its excellent absorption characteristics for copper alloys, it is optimal for processing.

  On the other hand, when the lead material is a copper alloy such as phosphor bronze or brass, if a YAG laser (wavelength 1064 nm) is used, the reflectivity is large and the absorbency is poor. The problem is that quantitative tuning becomes difficult due to the influence of the laser, and in the case of the same laser, since the wavelength is long, the heat generation of the lead increases, the physical properties change, and the durability deteriorates. This is not desirable because it causes problems.

  Furthermore, if a laser beam is used, there is no need to fix the lead with a spatula as in manual tuning, and no burrs will occur around the lead.

  In the tuning method of the present embodiment, as shown in FIG. 9A, the tuning is performed in a state where the lead 22 is fixed to the holding plate 14. In this state, since the surface of the lead 22 is exposed to the outside, it is possible to irradiate a laser beam, and the melting / evaporating part 30 can be formed on the lead 22 to perform tuning.

  In addition to the tuning method of this embodiment, tuning processing in the form shown in FIG. 9B is possible. The state shown in FIG. 5B is a state in which the leads 22 and 24 are fixed to the upper and lower lead holding plates 14 and 16 and assembled to the upper and lower surfaces of the harmonica main body 12. In other words, In this state, the covers 18 and 22 are removed from the assembled state of the harmonica 10.

  In this state, as can be understood with reference to FIG. 2, the lower lead 24 is exposed to the outside so that it can be irradiated with a laser beam, and the upper lead 22 is on the back side of the upper lead holding plate 14. However, most of them are exposed upward through the through-hole 14a, so that the laser beam can be irradiated from this direction.

  Therefore, even when the holding plates 14 and 16 are assembled to the harmonica body 12, the laser beam can be irradiated to form the melting / evaporating portions 30c and 30d on the lead 24, thereby performing tuning processing.

  According to the tuning method as described above, when the lead holding plates 14 and 16 having the tuned leads 22 and 24 are assembled to the harmonica main body 12, the pitch may change. In the tuning, the tuning is performed again, and tuning is performed. However, when a laser beam is used, tuning in the assembled state is possible, so that the time required for tuning can be greatly shortened.

In the above embodiment, the case where the present invention is applied to the processing of the leads 22 and 24 of the harmonica 10 is illustrated. However, the implementation of the present invention is not limited to this, for example, a keyboard harmonica or the like. Furthermore, the present invention can be applied to lead tuning of a free lead musical instrument in which a thin piece freely vibrates in a frame.

  According to the lead machining method, harmonica and keyboard harmonica according to the present invention, the durability of the leads 22 and 24 is not deteriorated, and skill is not required, and the tuning is speeded up and stabilized as compared with the conventional manual tuning. Can be achieved at the same time, and can greatly contribute to this kind of field.

It is a disassembled perspective view of the harmonica to which the processing method concerning this invention is applied. It is sectional drawing of the assembly state of the harmonica shown in FIG. It is explanatory drawing of the pronunciation state of the harmonica shown in FIG. It is explanatory drawing of the pronunciation at the time of blowing with the harmonica shown in FIG. It is explanatory drawing of the pronunciation at the time of breathing in with the harmonica shown in FIG. It is explanatory drawing of a lead. It is explanatory drawing which shows one Example of the lead processing method concerning this invention. It is explanatory drawing which shows the tuning method of a present Example, and explanatory drawing which shows the other tuning method. (A) is explanatory drawing which shows the tuning method of a present Example. (B) is explanatory drawing which shows the other Example of the tuning method concerning this invention. It is explanatory drawing which shows the other example of the lead processing method concerning this invention. It is explanatory drawing which shows the example of the tuning by the conventional manual work.

10 harmonica 12 harmonica main body 14 upper lead holding plate 16 lower lead holding plate 18 upper cover 20 lower cover 22 upper lead 24 lower lead 22b, 24b lead main body portions 22a, 24a fixing portion 30c, 30d melting / evaporating portion in laser tuning

Claims (4)

A harmonica or keyboard harmonica tuning method comprising a lead body part and a lead integrally formed at one end of the lead body part and fixed to a holding plate, and having a lead tuned to generate a sound of a predetermined scale In
A tuning method, wherein a tuning is performed by irradiating a surface of the fixed part with a laser beam to form a melting / evaporating part on the surface of the fixed part to lower a pitch and to obtain a predetermined pitch. The fixing part has a fixing point for fixing the lead to the holding plate, and a wide part provided on the outer periphery of the fixing point and wider than the lead main body part. The tuning method according to claim 1, wherein the tuning method is formed in the wide portion. A method of manufacturing a harmonica or a keyboard harmonica having a lead body portion and a lead body integrally formed at one end of the lead body portion and having a lead portion tuned to generate a sound of a predetermined scale is provided. And
A harmonica and a keyboard harmonica characterized by irradiating the surface of the fixed part with a laser beam and lowering the pitch by forming a melting / evaporating part on the surface of the fixed part, and tuning to a predetermined pitch . Manufacturing method . The fixing part has a fixing point for fixing the lead to the holding plate, and a wide part provided on the outer periphery of the fixing point and wider than the lead main body part. 4. The method of manufacturing a harmonica and a keyboard harmonica according to claim 3, wherein the harmonica is formed in the wide part.

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