JP3496003B2 - flute - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a flute,
In particular, it relates to a flute characterized by the surface shape of the reflector and the cross-sectional shape of the head tube.

[0002]

2. Description of the Related Art The flute is a musical instrument that is difficult for the beginners to express emotions and is difficult to perform as desired, as compared with other woodwind instruments that use reeds.

FIG. 11 shows a conventional head tube and reflector.
It is shown in a sectional view.

At the end of the head tube 40, the cork plug 12, the screw shaft 13 and the reflection plate 41 are attached by a head screw 14 in a pulled state. The reflector 41
Has a function of transmitting the vibration generated by the breath blown to the mouth 40a opened in the mouthpiece 45 to the inside of the flute tube, and at the same time, returning the standing wave generated in the tube to the mouth again.

The inside of the head tube 40 has a tapered shape, and the blower port 4 opened inside the head tube 40.
The distance from the center of 0a to the reflection plate 41 is equal to the width of the cross section of the head tube 40 and is 17.2 mm (or 17.0 m).
m). Although these are known, there have been few theoretical studies on the reason.

An improved example of a flute head tube and a cork stopper is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-124042. Conventionally, it is attached to a cork stopper as shown in FIG. The end face of the reflector is flat in the direction orthogonal to the axial direction of the head tube.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a detailed structure of a flute that can be easily played and can be expressed more effectively by adopting an acoustically rational structure. To do.

[0008]

The inventor of the present invention considers that the internal shape formed by the flute head tube and the reflector is one of the extremely important factors that determine the characteristics of the sound to be reverberated. The reason why the distance from the center of the mouthpiece that opens inside the head tube to the reflector is equal to the width of the cross section of the head tube is considered. As a result of a comparative study, the present invention has been accomplished.

[0009]

That is, as one aspect of the flute of the present invention, a part or all of the surface of the reflector forms a paraboloid of revolution whose focal point is the center of the blow-out opening that opens inside the head tube.

Furthermore, at least the reflector can be rotated at the end of the screw shaft that locks the reflector with the cork stopper and the head screw so that the position of the focal point of the paraboloid of revolution of the reflector can be adjusted. It is desirable to have a mechanism that

A different aspect of the flute of the present invention is that a cross section that passes through the center of the blowout opening inside the head tube and is perpendicular to the length direction of the head tube passes through the center and the width direction of the head tube. Has a parabola whose axis is a straight line extending in a straight line and a straight line which passes through the center and is perpendicular to the straight line, and a part of a cross section perpendicular to the longitudinal direction of the head canal is the bow shape. Is an almost similar form. Alternatively, a cross section that passes through the center of the blowout opening that opens inside the head tube and is perpendicular to the length direction of the head tube is a D-shape that connects a rectangle and a parabola, and the length direction of the head tube A part of the cross section perpendicular to is substantially similar to the D-shape.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a reflector and a cork stopper according to the present invention. The thin line shown on the surface of the reflector is an auxiliary line showing the shape. FIG. 2 is a cross-sectional view, in which the extended portion of the paraboloid of revolution that constitutes the surface of the reflector, the axis of the paraboloid of revolution, and the focus are indicated by thin lines. FIG. 5 is a sectional view showing the head tube and the reflector. FIG. 6 is a plan view showing the head tube of the present invention.

The difference from the prior art is mainly the shape of the surface of the reflection plate 11. The surface 11a of the reflector 11 forms a paraboloid of revolution with the center 11b of the blowout opening 10a opened inside the head tube 10 as the focal point.

The surface of the reflector is shown in a perspective view in FIG.
As shown in the sectional view in FIG. 3, only a part may form a paraboloid of revolution. In the case of the present embodiment, a gentle curved surface is formed around the rotary radiation surface 21a so as to be continuously connected to the inner wall of the head tube.

Further, the paraboloid of revolution 11 of the reflection plate 11
In order to adjust the position of the focal point of a, a groove for a minus driver that allows the reflector 11 to rotate is provided at the end of the screw shaft 13 that locks the reflector 11 with the cork plug 12 and the head screw 14. Prepare Screw shaft 13
By the groove at the end of, the focus of the paraboloid of revolution 11a is blown out 1
It becomes possible to easily align with the center of 0a. That is, the cork stopper 12 is inserted into the conventional head tube 10 with the outer surface of the reflection plate 11 fitted to the cylindrical inner surface of the head tube 10.

Alternatively, a projection may be provided on the inner surface of the cylinder of the head tube 10 and a groove that engages with the projection may be provided on the side surface of the reflection plate 11.

Other than these, it is the same as the conventional flute.

FIG. 7 is a plan view showing another embodiment of the present invention, and FIG. 8 is a sectional view taken along line VIII-VIII of FIG.

In the illustrated embodiment, the cross section of the head tube 20 passing through the center of the blower port 20a opened in the head tube 20 and perpendicular to the longitudinal direction of the head tube 20 passes through the center and passes through the center of the head tube 20. A parabola having a straight line extending in the width direction as an axis, and a straight line that passes through the center and is perpendicular to the straight line, and has an arc shape.
A part of the cross section of the head tube 20 which is perpendicular to the lengthwise direction has a substantially similar shape to the bow shape.

FIG. 9 is a plan view showing the head tube of the present invention, and FIG. 10 is a sectional view taken along line XX of FIG.

In the illustrated embodiment, a cross section that passes through the center of the air outlet 30a opened inside the head tube 30 and is perpendicular to the length direction of the head tube 30 has a D-shape connecting a rectangle and a parabola. A part of the cross section of the head tube 30 which is perpendicular to the length direction is substantially similar to the D-shape.

Although not analyzed in detail, in the flute of the present invention, the vibration of the air due to the air flow blown to the mouthpiece is transmitted to the center of the blowout opening inside the head tube, and this vibration is It is a reflector of a paraboloid of revolution with the center as the focal point, and it is thought that the loss is small and the reflection is close to ideal, and is transmitted in the length direction of the head tube.

It was confirmed that in the performance of the prototype, it is easy to form the lips that make the sound resonate and to blow the breath. Also, compared to other woodwind instruments that use reeds,
Although it is a flute whose emotional expression is difficult, we were able to confirm that it was easy to perform what was called.

[0026]

According to the present invention, it is possible to obtain a very remarkable effect that a difficult flute can be easily played and more effective expression can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a reflector and a cork stopper according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a reflector and a cork stopper shown in FIG.

FIG. 3 is a perspective view showing a reflector and a cork stopper according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the reflector and the cork stopper shown in FIG.

FIG. 5 is a cross-sectional view showing a head tube and a reflector of an embodiment of the present invention.

6 is a plan view showing the head tube shown in FIG. 5. FIG.

FIG. 7 is a plan view showing a head tube according to another embodiment of the present invention.

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a plan view showing a head tube according to another embodiment of the present invention.

10 is a sectional view taken along line XX of FIG.

FIG. 11 is a cross-sectional view showing a conventional head tube and reflector.

[Explanation of symbols]

10, 20, 30, 40 head tube 10a, 20a, 30a, 40a 10b, 20b, 30b, 40b Joint part 11, 21, 41 Reflector 11a, 21a paraboloid of revolution 11b, 21b focus 12 corks 13 screw shaft 14 head screw 15, 25, 35, 45 mouthpiece

Claims (4)

(57) [Claims] 1. A flute characterized in that part or all of the surface of the reflector forms a paraboloid of revolution whose focal point is the center of the blow-out opening that opens inside the head tube. 2. At least the reflector can be rotated at the end of a screw shaft that locks the reflector with a cork stopper and a head screw so that the position of the focal point of the paraboloid of revolution of the reflector can be adjusted. The flute according to claim 1 , further comprising: 3. A cross section that passes through the center of the blowout opening inside the head tube and is perpendicular to the length direction of the head tube has a straight line passing through the center and extending in the width direction of the head tube as an axis. A parabola and a straight line that passes through the center and is perpendicular to the straight line have a bow shape, and a part of a cross section perpendicular to the longitudinal direction of the head canal is
A flute having a substantially similar shape to the bow shape. 4. A cross section that passes through the center of the blowout opening inside the head tube and is perpendicular to the length direction of the head tube is D-shaped in which a rectangle and a parabola are connected. A flute characterized in that a part of a cross section perpendicular to the length direction is substantially similar to the D-shape.