JPH0719139B2 - Keyboard wind instrument - Google Patents

Description

The present invention relates to a keyboard wind instrument equipped with an auxiliary air chamber in addition to an air chamber. The air chamber and the auxiliary air chamber, which are arranged with the whistle chamber sandwiched therebetween, are formed on a partition wall of the whistle chamber. The communication is facilitated by improving the resonance characteristics by communicating with each other.

[Conventional technology]

Generally, a keyboard wind instrument of this type is provided with a plurality of flute chambers which are separated from each other by partition walls corresponding to respective pitches. A reed is provided at the air inlet of the whistle chamber, and the outlet is normally closed by a valve that operates in conjunction with key operation. At the time of playing, the air sent from the blow-out port flows into the whistle chamber through the air chamber, and when the inflowing air is discharged from the discharge port opened by the key operation, the reed is made to ring.

In this case, the air chamber is formed elongated along the direction in which the whistle chambers are arranged so as to be common to all whistle chambers. The air in the air chamber has a natural frequency determined by the length and volume of the air chamber. Therefore, when a lead having a frequency close to this natural frequency vibrates, the air in the air chamber resonates and interferes with each other. For this reason, there is a problem that a beat is generated, the sound is muddy, and the volume is changed.

Therefore, as a means for solving this drawback, there are conventionally known keyboard wind instruments described in, for example, Japanese Utility Model Publication No. Sho 58-41590 and Japanese Utility Model Publication No. 62-46228.

In the former case, an auxiliary air chamber is provided in addition to the main air chamber, and the auxiliary air chamber and the main air chamber are communicated with each other through a communication hole. With this auxiliary air chamber, the natural frequency of the air chamber is set to a value significantly different from the frequency of the reed.
This prevents resonance and improves the balance of volume and timbre.

In the latter case, air chambers are installed above and below the whistle chamber,
These upper and lower air chambers are connected to the high and low side of the whistle chamber.
They communicate with each other at some point. A partition plate for air shielding is provided in either one of the upper and lower air chambers.

This allows air convection balance (resonance characteristics of the air chamber)
Has been improved so that all sounds from bass to treble can be played at an average volume. That is, since air convection is balanced by the upper and lower air chambers, the air chambers in both air chambers are not blown away, and it is possible to perform with a sound volume averaged over the entire range from low to high frequencies.
Then, one air chamber is partitioned into two chambers by a partition plate, and each chamber is communicated with the other air chamber. Since there are three air chambers in total, the degree of freedom in adjusting resonance characteristics is greater than when two air chambers are provided.
Easy to balance air convection. In other words, it is easy to lower the resonance frequency (f0).

[Problems to be Solved by the Invention]

However, in such a conventional keyboard wind instrument, the following drawbacks have occurred.

That is, in the former case, there is only one communication hole that connects the auxiliary air chamber and the main air chamber on the highest sound side of the air chamber forming member, and therefore the degree of freedom in adjusting resonance characteristics is high. Was small.

On the other hand, the latter has more freedom than the former. However, the upper and lower air chambers are only communicated with each other in the whistle chamber forming member at two locations, a high tone side and a low tone side of the whistle chamber. Therefore, even if the length (volume) of the two partitioned air chambers can be changed, the position of the partition plate can only be adjusted, and the degree of freedom is still poor.

An object of the present invention is to increase the degree of freedom in designing the position, size, position of the communication hole, etc. of the auxiliary air chamber when adjusting resonance characteristics.

[Means for Solving the Problems]

Therefore, the present invention corresponds to each of a plurality of pitches, and is communicated with a plurality of whistle chambers that are separated from each other by a partition wall and formed in parallel with each other, and is connected to the whistle chambers through leads respectively. An air chamber for circulating the air from the lever mouth, a whistle chamber sandwiched between the air chamber and a sub-air chamber communicating with the air chamber, and a plurality of whistle chambers respectively opened. , A plurality of air outlets that are opened and closed by a plurality of valves that are interlocked with key operation, and a communication hole provided in a partition of the whistle chamber for connecting the air chamber and the sub air chamber. The above object is achieved by providing a keyboard wind instrument in communication.

[Action]

In the keyboard wind instrument according to the present invention, the air chamber and the sub air chamber, which are arranged so as to sandwich the whistle chamber, communicate with each other through the communication hole formed in the partition wall of the whistle chamber. Therefore, the position and the number of the communication holes are not limited, and the position, the size, and the number of the auxiliary air chambers are not limited by the communication holes.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view showing a first embodiment of a keyboard wind instrument according to the present invention. FIG. 2 is a plan view of the keyboard wind instrument according to the first embodiment. FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 4 is a plan view showing the frame according to the first embodiment.

In these drawings, reference numeral 11 denotes a concave instrument case of a keyboard wind instrument, which is formed in a substantially rectangular box shape with an open upper side. The musical instrument case 11 protects and stores the frame 21 having the keyboard 15 and the air chamber member 25, and also enhances the sound reverberation effect.

As shown in FIG. 1, a frame 21 is inserted and fixed inside the musical instrument case 11, and a plurality of white keys 13A and black keys 13B are arranged side by side in the frame 21 to form a keyboard 15. There is. An air chamber member 25 is connected to the frame 21. In the frame 21, the same number of whistle chambers 31 are formed corresponding to each of the plurality of keys 13A and 13B. Reference numeral 33 is a partition wall that defines the whistle chambers 31. While a plurality of whistle chambers 31 are arranged in the key arrangement direction (horizontal direction), the partition 33 extends in the vertical direction as shown in FIG. Dividing 31.

Below the frame 21, an air chamber member 25 forms a main air chamber 35 having a predetermined volume. A lead plate 41 is interposed between the main air chamber 35 and the whistle chamber 31 to form a frame.
It is fixed to the 21 side with screws. The main air chamber 35 and each whistle chamber 31 communicate with each other through a plurality of openings provided in the lead plate 41. A plurality of leads made of strip-shaped thin metal plates are provided in these openings.
42 is supported in a cantilever manner. That is, one end of each lead 42 is fixed to the edge portion (lead plate 41) of the opening by, for example, spot welding, and the other end is configured to be vibrated by the air flow passing through the whistle chamber 31. The vibration of the lead 42 periodically opens and closes the opening to form an intermittent air flow, thereby generating a sound of a predetermined pitch.

In addition, in the frame 21, these whistle chamber 31 and instrument case 11
A plurality of air discharge ports 45 communicating with the internal space 43 of the above are formed. These air outlets 45 are opened and closed by valves 47 formed integrally with and suspended from the keys 13A and 13B, respectively, so that an air flow can be generated in any whistle chamber 31.
A desired pitch can be produced by operating 13A and 13B. Therefore, each whistle chamber 31 is defined between the opening of the lead plate 41 and the air exhaust port 45 opened and closed by the valve 47. The internal air 43 is formed between the internal wall 43 and the outer wall of the frame 21, and is open to the external space.

Further, a sub air chamber 51 extending along the key arrangement direction is formed on the upper side of the frame 21. That is, the sub air chamber 51
Is arranged so as to sandwich the plurality of whistle chambers 31 with the main air chamber 35.

In addition, as shown in FIG. 3, the sub air chamber 51 has a partition wall 53.
Is divided into a predetermined number of small chambers having a predetermined volume, for example, three small chambers 51A, 51B and 51C.

Here, as shown in FIG. 3 and FIG.
A communication hole 61 that extends in the up-down direction is formed at a predetermined position within the partition wall 33 that defines 31 members. These communication holes 61 communicate the small chambers 51A, 51B, 51C of the sub air chamber 51 with the main air chamber 35. That is, these communication holes 61
The upper end of the is opened to the sub air chamber 51, and the lower end thereof is opened to the main air chamber 35.

As shown in FIGS. 2 and 3, a blower member 63 is attached to one end of the musical instrument case 11 in the longitudinal direction. The blower member 63 has a flow passage 65 communicating with the main air chamber 35. The air blown from the blower member 63 is first introduced into the main air chamber 35 through the flow passage 65, and then the whistle chamber.
31 and the sub air chamber 51.

In the keyboard wind instrument having the above structure, the mouthpiece member 63
Blow more air and press any key 13A, 13B,
Correspondingly, its valve 47 opens the air outlet 45. As a result, the key
Air flows into the whistle chamber 31 corresponding to 13A and 13B from the main air chamber 35 and flows out from the air outlet port 45. At this time, the main air chamber 35
The lead 42 disposed in the opening between the whistle chamber 31 and the whistle chamber 31 vibrates due to the air flow. Therefore, a predetermined pronunciation can be obtained.

In the above case, the sub air chamber 51 changes the natural frequency of the main air chamber 35 so that the sub air chamber 51 has a proper vibration characteristic as a whole different from the natural frequency of the lead 42. . Further, the sub air chamber 51 communicates with the main air chamber 35 via a communication hole 61 formed in the partition wall 33. Therefore, the air flow flowing into the main air chamber 35 communicates with the sub air chamber 51 through the plurality of communication holes 61, so that a sudden feeling does not occur. The feeling of resistance to blowing is reduced.

〔effect〕

As described above, according to the present invention, the degree of freedom in designing the sub air chamber is significantly increased. In addition, the degree of freedom in designing the communication holes is increasing. Therefore, the overall resonance characteristics of the air chamber can be finely improved and the resonance characteristics can be optimized. As a result, the pronunciation balance of the keyboard instrument can be improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a keyboard wind instrument according to the present invention, FIG. 2 is a plan view of a keyboard wind instrument according to the first embodiment, and FIG. 3 is III- of FIG. A sectional view taken along the arrow III, and FIG. 4 are plan views showing the frame according to the first embodiment. 11 …… Musical instrument case, 13A, 13B …… Key, 21 …… Frame,
31 …… whistle chamber, 33 …… bulkhead, 35 …… main air chamber, 42 …… reed, 45 …… air outlet, 47 …… valve, 51 …… sub air chamber, 61
...... Communication hole, 63 …… Blowout member, 65 …… Flow passage.

Claims (1)

[Claims] 1. A plurality of whistle chambers corresponding to a plurality of pitches, which are separated from each other by a partition wall and are formed in parallel with each other. An air chamber that circulates the air from the air outlet, a whistle chamber sandwiched between the air chamber and a sub air chamber that communicates with the air chamber, and each of the plurality of whistle chambers has an opening. In a keyboard wind instrument equipped with a plurality of air outlets that are opened and closed by a plurality of valves that interlock with key operations, a communication hole provided in a partition of the whistle chamber allows the air chamber and the sub air chamber to communicate with each other. A keyboard wind instrument that is characterized by