JP3633826B2 - Wolf tone remover for violin genus instruments - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wolf tone remover capable of preventing the generation of a wolf tone by being attached to a violin musical instrument such as a violin, a viola, or a cello.
[0002]
[Prior art]
The violin musical instrument has a box-shaped main body composed of a front plate, a back plate, and side plates connecting them, and a pair of f-shaped holes (f-shaped holes) are formed on the front plate. The vibration of the string is transmitted to the front plate and the back plate through the piece, vibrates them, and is emitted as an enlarged sound from the surface. However, in addition to this, resonance due to the box-like shape of the main body, so-called Helmholtz resonance occurs. Helmholtz resonance occurs with a specific frequency A0 as a fundamental frequency due to the internal space volume of the main body, the size of the f-shaped hole, the rigidity of the front and back plates, and the like.
[0003]
Within the frequency range of Helmholtz resonance that can occur in the case of a violin, the pitches are B (246.94 Hz), C (261.63 Hz), C # (277.18 Hz), D (193.66 Hz) (above A Is 440 Hz). If the frequency of Helmholtz resonance is close to these pitches, the original sound due to string vibration and the sound due to Helmholtz resonance are mixed, resulting in a fine beat in the sound emitted from the instrument. This is an abnormal sound called a so-called wolf tone, which occurs against a player's will at a specific pitch, and lowers the quality of the performance sound.
[0004]
Normally, in order to avoid such drawbacks, musical instruments are designed and manufactured with the intention that the fundamental frequency A0 of Helmholtz resonance is in the middle of the correct scale interval. Variation, and not necessarily at an appropriate intermediate position. The basic pitch of the musical instrument at the time of performance is selected from a range of about 438 to 446 Hz, where the pitch A is not always 440 Hz. This fluctuation range of 8 Hz corresponds to 31.3 cents (a semitone is 100 cents). Therefore, even if the musical instrument is manufactured so that the resonance frequency A0 is in the middle of the scale interval with reference to the A sound of 440 Hz, the effect of preventing the wolf tone is lost depending on the selection of the basic pitch.
[0005]
Furthermore, the resonance frequency A0 also changes depending on the temperature and humidity of the environment where the musical instrument is played.
[0006]
Thus, it is extremely difficult to prevent the wolf tone by setting the resonance frequency A0 at the time of manufacturing the musical instrument. Therefore, there has been a demand for the realization of a technique capable of preventing the generation of a wolf tone without being affected by the above-mentioned various conditions.
[0007]
As an intention to meet such a demand, L. Miles' paper “TUNING THE A0 MODE WITHOUT CHANGING THE BODY OR f-HOLE SIZE” (A0 mode adjustment without changing the size of the main body or f-hole ”[CAS Journal Vol. 4, No. II (Series II) Published in November 1997], there is a wolf tone prevention experiment for a viola described in this article, in which a spherical hollow body of volume V opens only at the neck extending from the hollow body (trunk), and the neck Assuming a container having a length L and an opening area a, the Helmholtz resonance frequency F is v
F = v / 2π (a / VL) ^1/2 [Formula 1]
It pays attention to what can be expressed.
[0008]
That is, in Equation 1, V is the internal space volume of the viola body, and a and L are the opening area and thickness of the f-shaped hole, respectively. In order to increase the thickness L of the f-shaped hole, a film was attached around the f-shaped hole on the front plate, and the film was extended into the instrument body. Thereby, the resonance frequency A0 could be lowered from the original value. According to Equation 1, if the thickness of the surface plate around the f-shaped hole is interpreted as L and increased, the resonance frequency A0 is expected to decrease correspondingly. The wave of air passing through the hole spreads in directions other than the direction perpendicular to the opening surface, and does not show the expected decrease. Miles realized a decrease in resonance frequency by surrounding the f-hole with a film to increase the length of the open neck so that it cannot be achieved by increasing the plate thickness.
[0009]
However, this means that the film has to be stuck along the periphery of the f-shaped hole having a complicated shape, so that it takes time and is difficult to increase the bonding strength. It was poor.
[0010]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems of the prior art, can be easily adapted to the selection of the basic pitch and the conditions of the performance environment without being affected by variations in conditions during manufacture, and is practical. The aim is to provide a rich wolf tone remover.
[0011]
[Means for Solving the Problems]
The object of the present invention includes a support body that can be removably inserted into an f-shaped hole of a violin genus instrument, and an adherend that is supported by the support body and that can partially cover the f-shaped hole. A leg that can be inserted into the f-shaped hole of the musical instrument, and a column that is fixed to the leg so as to protrude out of the f-shaped hole from the leg when the leg is inserted into the f-shaped hole. The leg portion includes a protrusion protruding in one direction from a portion fixed to the column body, and the adherend has an inner diameter through which the column body can be passed and an outer diameter larger than the circular hole of the f-shaped hole. This is achieved by a wolf tone remover characterized in that it has a diameter so that it can be held by the column body and can sandwich a front plate of a musical instrument between the leg and cover part of the f-shaped hole .
[0012]
The wolf tone remover is configured such that when the adherend is screwed and rotated to the column body when the adherend is brought to the front plate holding position of the musical instrument in a state where the leg portion is inserted into the f-shaped hole, the column is removed. The holding part for holding | maintaining the position of a body and a leg part shall be provided in the edge part on the opposite side to the said leg part in the said column .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a state in which a wolf tone remover 1 according to the present invention is mounted on a surface plate A of a violin. As shown in the figure, the wolf tone remover 1 is inserted into a circular hole H1 at the lower end of the f-shaped hole H formed in the front plate A.
[0014]
2, 3, and 4 respectively show the front, plane, and bottom of the wolf tone remover 1. As shown in the figure, the wolf tone remover 1 includes a support body 2 that can be removably inserted into the f-shaped hole, and a deposition ring 3 that is supported by the support body and can cover a part of the f-shaped hole. The support 2 is fixed to the leg 4 that can be inserted into the circular hole H1 at one end of the f-shaped hole H, the column 5 that is provided with a male screw on the peripheral surface and fixed to the leg 4, and the upper end of the column 5. An end cap 6 is provided. The deposition ring 3 has an annular shape and is provided with a female screw on the inner peripheral surface thereof and is screwed to the column body 5.
[0015]
The leg 4 is provided with a protrusion 40 that protrudes in one direction from the portion fixed to the column body 5. As shown in FIG. 1, the protrusion 40 is passed through the circular hole H1 of the f-shaped hole from the tip portion, and then can be positioned on the lower side of the front plate around the circular hole. And thickness is decided. In this example, the protrusion 40 is slightly tapered toward the tip so that it can be easily passed through the circular hole H1 of the f-shaped hole, and the tip is rounded.
[0016]
The column body 5 is fixed to the leg portion 4 so as to protrude from the leg portion to the outside of the f-shaped hole when the leg portion 4 is inserted into the f-shaped hole.
[0017]
The deposition ring 3 has an inner diameter that can be screwed into the column body 5 and an outer diameter larger than the diameter of the circular hole H1 of the f-shaped hole, and the outer diameter covers the circular hole H1 of the f-shaped hole, and It is determined so that the front plate around the circular hole H1 can be sandwiched between the protrusion 40 of the leg 4. A fine groove knurling 30 is provided on the outer peripheral surface of the deposition ring 3 so that the deposition ring can be easily rotated by hand.
[0018]
The end cap 6 has a disk shape with a diameter larger than that of the column body 2, and the lower surface is flat. After the adherent ring 4 is screwed to the column body 5, the end cap 6 is fixed to the upper end surface of the column body 5 by adhesion or the like. Has been. The upper surface of the end cap 6 is a convex curved surface forming a part of a spherical surface.
[0019]
It is desirable from the viewpoint of ease of manufacture and lightness that the legs 4, the pillars 5, and the end caps 6 are made of plastic. The deposition ring 3 may be made of plastic, but may be made of metal in order to obtain high strength. In addition, it is desirable to stick soft materials such as rubber sheets 41 and 31 to the mutually facing surfaces of the leg 4 and the attachment ring 3 so as not to damage the surface plate A of the musical instrument.
[0020]
The dimensions of the illustrated violin wolf tone remover are as follows:
Column 5: outer diameter 6 mm, length (c) 9 mm
Leg part 4: Maximum length (e) 12 mm, thickness (d) 3 mm
Deposit ring 3: 12mm outer diameter, 3.5mm thickness
End cap 6: outer diameter 9.5 mm, maximum height 3 mm
The wolf tone remover 1 is used as follows. First, the ring 3 is turned by hand to reach a position away from the leg 4. In this state, the leg portion 4 is inserted into the f-shaped hole H1 of the musical instrument so as to be along the lower surface of the front plate. As a result, the column 5 is in a state of protruding outward from the f-shaped hole H. In this state, the end cap 6 is gripped to maintain the position of the leg 4, the adherend ring 3 is turned by hand to approach the leg 4, and the front plate A is fastened by the leg 4 and the adherent ring 3. Just do it. As a result, the wolf tone remover 1 is firmly fixed on the front plate A. To remove the Wolf Tone Remover from the instrument, just reverse the above procedure.
[0021]
As described above, the wolf tone remover 1 covers a part of the f-shaped hole H and reduces the opening area thereof. The mounting can be performed by a simple operation of inserting the leg portion 4 into the f-shaped hole and tightening the adherent ring. FIG. 5 is a sectional view showing a state in which the wolf tone remover 1 is mounted in the f-shaped hole H of the front plate A.
[0022]
The change of the resonance frequency by mounting the wolf tone remover 1 was as follows. When the wolf tone remover 1 was mounted in the circular hole H1 near the end piece in the f-shaped hole on the treble string side, the resonance frequency (A0) changed from 275 Hz before mounting to 268.75 Hz. This 6.25 Hz drop corresponds to -40 cents. Furthermore, the same wolf tone remover 1 was also mounted in a circular hole near the end piece in the f-shaped hole on the bass string side. Thereby, the resonance frequency (A0) changed from 268.75 Hz when the above-mentioned one was mounted to 263.75 Hz. This 5 Hz drop corresponds to -33 cents. In other words, by installing one wolf tone remover, the resonance frequency can be changed by a width close to half of a semitone, and by installing two wolf tone removers, the width of approximately 70% of a semitone can be changed. did it.
[0023]
The wolf tone remover 1 can also be mounted in the circular hole H2 near the neck of the instrument in the f-shaped hole, and this can also provide the same or similar effect as described above. It can also be attached to an intermediate portion H3 between the circular holes in the f-shaped hole. In this case, if necessary, the shape and dimensions of the leg portion, column, and deposition ring are adapted to the intermediate portion.
[0024]
The end cap 6 is provided for the purpose of preventing the adherent ring 3 from coming off the column body 5 and maintaining the position of the leg 4 when the adherent ring 3 is rotated. Accordingly, the end cap can be omitted by attaching a retaining ring and a gripping part having another shape to the upper end of the column body 5.
[0025]
In addition to the annular ring, the deposition ring 3 can be a deposition member having various shapes suitable for covering the f-shaped hole. Further, as a means for holding the position of the adherent member for sandwiching the front plate of the musical instrument between the adherent member and the leg portion, other than by means of screwing of the male screw of the pillar body and the female screw of the adherent member, the pillar body Various means such as those caused by frictional contact between the outer peripheral surface of the member and the inner peripheral surface of the adherend member can be employed.
[0026]
【The invention's effect】
As is clear from the above, according to the present invention, by attaching to the f-shaped hole of a violin musical instrument, it is possible to cover a part of the f-shaped hole and reduce its opening area, thereby reducing the Helmholtz resonance frequency. Can be changed. Therefore, even when the Helmholtz resonance frequency is close to the scale interval due to variations in various conditions when the musical instrument is manufactured, the wolf tone can be removed by mounting the wolf tone remover according to the present invention. Further, it is possible to easily cope with the selection of the basic pitch and the conditions of the performance environment. In particular, even if the basic pitch or performance environment changes, the amount of change in the resonance frequency can be adjusted by changing the number and position of the wolf tone remover to be installed, so the wolf tone can be removed according to a wide range of conditions. And practicality is high. The instrument can be mounted by a simple operation of inserting the support into the f-shaped hole and holding the front plate between the adherend and the support, which is convenient for the instrument user.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of a wolf tone remover according to the present invention together with a part of a violin.
2 is a side view of the wolf tone remover shown in FIG. 1. FIG.
3 is a front view of the wolf tone remover shown in FIG. 1. FIG.
4 is a bottom view of the wolf tone remover shown in FIG. 1. FIG.
5 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wolf tone remover, 2 ... Support body, 3 ... Adhering body, 4 ... Leg part, 5 ... Column body, A ... Violin surface board, H ... F-shaped hole

Claims (2)

A support that can be removably inserted into the f-shaped hole of a violin musical instrument, and an adherend that is supported by the support and can cover a part of the f-shaped hole;
The support is fixed to the leg so that the leg can be inserted into the f-shaped hole of the musical instrument, and the leg protrudes out of the f-shaped hole when the leg is inserted into the f-shaped hole. A column body, and the leg portion includes a protrusion protruding to one side from a portion fixed to the column body,
The adherend has an inner diameter through which the column body can pass and an outer diameter larger than the circular hole of the f-shaped hole, so that a musical instrument front plate is sandwiched between the protrusion and the column body. A wolf tone remover characterized in that a part of the f-shaped hole can be covered . In the state where the leg portion is inserted into the f-shaped hole, a gripping portion for holding the position of the column body and the leg portion when the adherend is brought to the surface plate clamping position of the musical instrument is the The wolf tone remover according to claim 1, wherein the wolf tone remover is provided at an end opposite to the leg .

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