JPH02150897A - Fingerboard structure, neck structure, stringed instrument, and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fingerboard structure, a neck structure, a stringed instrument, and a manufacturing method thereof.

[Prior art and its problems] Generally, in the case of a one-string musical instrument, a plurality of frets are arranged on the fingerboard in order to indicate the pitch of musical tones to be generated.

FIGS. 11 and 12 show an example of a conventional fingerboard portion of such a stringed instrument.

This stringed instrument has a structure in which a plurality of frets 2 are hammered and press-fitted one by one into each predetermined location on a fingerboard 1 made of synthetic resin or wood. For this reason, fret press-fits yt3 are formed at each predetermined location on the fingerboard l.

On the other hand, the fret 2 consists of a fret body 4 for partitioning the surface of the fingerboard l, and a protrusion 5 protruding from the lower surface of the fret body 4. The protrusion 5 has a flat protrusion body 6.
It has a structure in which wedge portions 7 each having a semicircular cross section are formed on both sides of the structure. Then, the protrusion 5 press-fits into the fret j+
113, and the fret 2 is fixed to the fingerboard 1 by the wedge action of the wedge portion 7.

However, with conventional stringed instruments like this, it is extremely troublesome to hit the multiple frets 2 one by one.
There were problems in that productivity was extremely poor and costs were high. Furthermore, since the fret 2 is fixed to the fingerboard 1 by line contact with the tip of the wedge part 7 of the protrusion 5, the fixing contact area of the fret 2 to the fingerboard l is small, and the fret 2 is fixed from the fingerboard l to the fingerboard l. There was a problem that it easily came off. Furthermore, when the fret 2 is driven in, a force is applied to the fingerboard l to widen the fret press-fit groove 3, so the fingerboard 1 is warped, and this warpage must be corrected in some way. there were. In order to suppress this warping, if the wedge action of the wedge portion 7 of the fret 2 is made smaller, the bonding force of the fret 2 to the fingerboard 1 will be weakened, making it easier for the fret 2 to come off the fingerboard l, and That would be a contradiction. Furthermore, it is difficult to press-fit the plurality of frets 2 into the fingerboard l uniformly,
If there are variations in the height of the head of fret 2 or variations in the contact area of fret 2 with the fingerboard l, there will be variations in the string pressing operation, making it impossible to perform string pressing operations reliably. There was a problem.

[Object of the Invention] This invention was made in view of the above-mentioned circumstances, and its object is to more easily fix a plurality of frets firmly and uniformly on a fingerboard without causing warping. It is an object of the present invention to provide a fingerboard structure, a neck structure, and a stringed instrument that can be easily manufactured.

[Summary of the Invention] In order to achieve the above-mentioned object, the fingerboard structure according to the invention of claim 1 includes a fingerboard made of synthetic resin,
The key point is that the base end portions of the plurality of frets are integrally molded at predetermined intervals.

Further, the method for manufacturing a fingerboard structure according to the invention as claimed in claim 2 is such that the fingerboard structure is formed in a shape corresponding to the external shape of the fret body excluding the proximal end portion of the fret at intervals on the same plane in the mold. arranging each of the fret bodies of the plurality of frets in the plurality of recesses, injecting and pressurizing a resin material into the cavity of the mold, and forming a fingerboard with the synthetic resin material, The key point is that the method includes a step of integrally molding each base end portion of the plurality of frets and the fingerboard.

Further, the neck structure according to the invention as claimed in claim 3 is characterized in that the base end portions of the plurality of frets are integrally molded on the fingerboard surface of the neck formed of synthetic resin at a predetermined interval from each other. Make it the main point.

In addition, the method for manufacturing a neck structure according to the invention described in claim 4 is characterized in that a plurality of neck structures are formed at intervals on the same plane in a mold to have a shape corresponding to the external shape of the fret body excluding the base end of the fret. a step of arranging each fret body of a plurality of frets in the recess of the mold;
Synthetic resin material is injected and pressurized, and with this synthetic resin material,
The key point is that the method includes the steps of forming a neck and integrally molding each proximal end portion of the plurality of frets and the neck.

Furthermore, the main feature of the stringed instrument according to the fifth aspect of the invention is that the neck structure according to the third aspect and the body are integrally molded from a synthetic resin material.

Furthermore, the method for manufacturing a stringed instrument according to the invention according to claim 6 includes:
arranging each of the fret bodies of the plurality of frets in a plurality of recesses formed at intervals on the same plane in the mold and having a shape corresponding to the external shape of the fret body excluding the base end portion of the fret;

A synthetic resin material is injected and pressurized into the cavity of the mold, and the body and the neck protruding from the body are integrally molded using the synthetic resin material, and the proximal end portions of the plurality of frets are connected to the neck. The main point is that it consists of an integral molding process.

[Example] Hereinafter, the present invention will be described in detail with reference to Examples.

FIGS. 1 and 2 show a first fingerboard structure according to the present invention.
This figure shows the main parts of the example.

The frets 11 used in this fingerboard structure are made of metal such as stainless steel or hard synthetic wood. A flat protrusion (base end) that protrudes from the widthwise center of the lower surface over its entire length.
It has a structure with 13. On the other hand, the fingerboard 14 is
For example, compression molding materials such as FRP (reinforced plastic) made by adding reinforcing materials such as glass fiber to synthetic resins such as phenol resin and epoxy resin, or injection molding materials such as PP5 (polyphenylene sulfide) and PET (polyethylene terephthalate). It is made of material and is shaped like a strip. When each of the seven lets 11 is removed from the fingerboard 14, a plurality of fret fitting grooves 15 extending in the width direction are formed at intervals in the length direction.
is formed by integrally embedding each protrusion 13 of a plurality of frets 11 in the portions corresponding to these grooves 15 when the fingerboard 14 is formed of synthetic resin. .

That is, in this fingerboard structure, a plurality of frets are formed in the plurality of fret fitting grooves 15 of the fingerboard 14 formed of synthetic resin.
11 are integrally embedded when the fingerboard 14 is formed of synthetic resin, and each fret body 12 of the plurality of frets 11 protrudes above the fingerboard 14.

In this manner, in this fingerboard structure, the frets 11 are fixed to the fingerboard 14 by surface contact with the entire surface of the projections 13, so that the frets 11 and the fingerboard 14 are
The distance between the fixing contact surfaces is large, and the flexure 11 can be made difficult to come off from the fingerboard 14. In addition, when the fingerboard 14 is made of synthetic resin, the frets) 11
This is because the protrusions 13 are simply buried in one piece.

The fingerboard 14 is not subjected to a slight force that tries to widen its fret fittings fi15, and the fingerboard 14 does not warp.Furthermore, when the fingerboard 14 is made of synthetic resin, Since each protrusion 13 of a plurality of frets 11 can be buried at the same time, it can be easily manufactured in a short time. Furthermore, when the fingerboard 14 is made of synthetic resin, it is possible to uniformly embed each protrusion 13 of a plurality of frets 11 in it, so that the height of the head of the fret body 12 of the fret 11 can be adjusted. It becomes possible to make the contact area of the frets 11 uniform and the contact area of the frets 11 with the fingerboard 14 uniform.

Next, an example of manufacturing a fingerboard structure having such a structure will be described with reference to FIGS. 3 to 5.

First, as shown in FIG. 3, the recess 2 has a substantially semicircular cross section corresponding to the outer shape of the fret body 12 of the fret 11.
1 at intervals on the same plane.
, and place each fret body 12 of the plurality of frets 11 in the 6-concave 121 of the lower mold 22.Next, as shown in FIG. 4, the upper mold 23 is lowered and the lower mold The mold 21 is brought close to the mold 21 to form a cavity 24 for forming the fingerboard. Next, as shown in FIG. Next, the upper mold 23 is poured and hardened.
When the mold is opened by raising the
A fingerboard 14 with 1 is obtained. In addition, by performing compression molding using the compression molding material as described above, the fingerboard 14 of the fret 114=i position as described above can be formed.
can be obtained.

In this way, in this manufacturing method, after arranging the plurality of frets 11 in the lower mold 22, the fingerboard 14 is simply formed by resin molding, and each protrusion 13 of the plurality of frets 11 is embedded in the fingerboard 14. Therefore, products of constant quality can be easily obtained without requiring any skill.

Next, FIG. 6 shows the main parts of a second embodiment of the fingerboard structure according to the present invention.

In the first embodiment, since the protrusion 13 is provided over the entire length of the fret 11, the fret fitting groove 15 is formed over the entire width of the fingerboard 14. For this reason, the thickness t (see Fig. 2) of the fret fitting groove 15 portion of the fingerboard 14 becomes thinner over the entire area, and the strength of this portion becomes rather weak. In the example, as shown in FIG. 6, a plurality of protrusions 13 are provided at intervals along the length of the flange 11.

In this case, as shown in the figure, a plurality of fret fittings j7111 are arranged at intervals in the width direction of the fingerboard 14.
A flat portion 15a is formed except for the portion 5, and the overall strength of the fingerboard 14 is increased by the portion of the flat portion 15a that is formed. You will be able to do that.

In addition, in the embodiments shown in FIGS. 2 and 6, respectively,
Since the external shape of the protrusion 13 of the fret 11 is just a flat plate, if a certain amount of force is applied, the fret 1
1 from the fingerboard 14. Therefore, it is also possible to replace the frame 11.

Next, FIGS. 7 and 8 show the main parts of third and fourth embodiments of the fingerboard structure according to the present invention.

In these embodiments, the structure is such that the bonding force between the frets 11 and the fingerboard 14 is strong. That is, in the embodiment shown in FIG. 7, the protrusion 1 of the flange 11 shown in FIG.
A plurality of rectangular, circular, triangular, etc. holes 31 are provided at intervals in the fret 11 shown in FIG. It has a structure filled with synthetic resin that forms. 8th
In the embodiment shown in the figure, a projection 32 for preventing removal is provided at the lower part of the projection 13 of the flap 11 shown in FIG. 2 or 6.

Next, FIG. 9 shows a main part of an embodiment of the neck structure according to the present invention.

In this neck structure, the fingerboard surface 22 of the synthetic resin neck 21 which also serves as a fingerboard is provided with a second
Multiple frets) 11 with the same structure as the frets) 11 shown in the figure
It has a structure in which each protrusion 13 is integrally molded.

That is, in this neck structure, a plurality of fret fitting grooves 23 on the fingerboard surface 22 of the neck 21 formed of synthetic resin are used.
In this structure, each protrusion 13 of a plurality of frets 11 is integrally molded at the same time when the neck 21 is formed of synthetic resin, and each fret body 12 of the plurality of frets 13 protrudes above the fingerboard surface 22 of the neck 21. It becomes.

Therefore, in this neck construction, as in the case of the fingerboard construction described above, the frets 11 can be fixed to the fingerboard surface 22 of the neck 21 so as not to easily come off, and the neck 21 can be prevented from warping. No, even fret 11
can be fixed uniformly to the fingerboard surface 22 of the neck 21.

In order to manufacture this neck structure, the method for manufacturing the fingerboard structure described above is followed except that the shape of the cavity of the mold is made into a shape corresponding to the external shape of the neck 21. Since this method is completely the same as that for manufacturing a fingerboard structure, a detailed explanation of the manufacturing method will be omitted.

Next, FIG. 1θ shows the appearance of an embodiment of a stringed instrument according to the present invention.

In this stringed instrument, a body 31 and a neck 32 protruding from the body 31 are integrally molded from synthetic resin, and a second
A plurality of frets) 11 having the same structure as the fret 11 shown in the figure
It has a structure in which each protrusion (not shown) is integrally molded.

Therefore, in this stringed instrument as well, the frets 11 can be fixed to the fingerboard surface 33 of the neck 32 in a manner that prevents them from coming off, as in the case of the fingerboard structure described above.
Further, the frets 11 can be evenly fixed to the fingerboard surface 33 of the neck 32 without causing any warping.

In order to manufacture this stringed instrument, the above-mentioned method for manufacturing the fingerboard structure is performed except that the shape of the cavity of the mold is made to correspond to the external shape of the body 31 and the neck 32. Since this is no different from the case of manufacturing a plate structure, a detailed explanation of the manufacturing method will be omitted.

Furthermore, as is clear from the above description, the present invention is applicable to all stringed instruments with frets, such as traditional natural stringed instruments such as guitars, lutes, and banjos, as well as electronic guitars, It can also be applied to electronic or electric string instruments such as electric guitars and electronic violins.

[Effects of the Invention] As explained above, according to the inventions of claims 1.3 and 5, the base ends of the plurality of frets are integrally molded on the fingerboard or on the fingerboard surface of the neck. Therefore, unlike the conventional wedge type, the contact area for fixation is larger, and the frets can be more firmly fixed to the fingerboard or the fingerboard surface of the neck. The plate or neck does not warp, and products of constant quality can be easily obtained in a short period of time without requiring any skill, making it possible to mass-produce and reduce costs.

Further, according to the inventions described in claims 2.4 and 6, fingerboards, necks, and stringed instruments each having a plurality of frets can be easily manufactured with constant quality without requiring any skill.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts showing a first embodiment of a fingerboard structure according to the present invention, FIG. 2 is an exploded perspective view of this fingerboard structure,
3 to 5 are process diagrams shown to explain an example of the method for manufacturing this fingerboard structure, and FIG. 6 is a main part showing a second embodiment of the fingerboard structure according to the present invention. 7 and 8 are cross-sectional views of the main parts of the third and fourth embodiments of the fingerboard structure according to the present invention, and FIG. 9 is a cross-sectional view of the neck structure according to the present invention. FIG. 10 is an external view showing an embodiment of a stringed instrument according to the present invention; FIG. 11 is a partial cross-section showing an example of a fingerboard of a conventional stringed instrument. 12 are perspective views showing frets in this conventional example. 11...Fret, 12...Fret body, 13...Protrusion (base end), 14...
...Fingerboard, 15...Fret fitting groove, 21.3
2...Neck, 22.33...Fingerboard surface, 31...Body. Fig. Fig. Fig. Fig. Fig. Fig. Fig. 11 Fig. Fig. 12

Claims (6)

[Claims] (1) A fingerboard structure characterized in that base end portions of a plurality of frets are integrally molded on a fingerboard made of synthetic resin at predetermined intervals. (2) Each of the fret bodies of the plurality of frets is placed in a plurality of recesses formed at intervals on the same plane in the mold in a shape corresponding to the external shape of the fret body excluding the base end of the fret. step, and in the cavity of the mold,
Synthetic resin material is injected and pressurized, and with this synthetic resin material,
A method for manufacturing a fingerboard structure, comprising the steps of forming a fingerboard and integrally molding each base end of the plurality of frets and the fingerboard. (3) A neck structure characterized in that base end portions of a plurality of frets are integrally molded on the fingerboard surface of a neck made of synthetic resin at predetermined intervals. (4) Each of the fret bodies of the plurality of frets is placed in a plurality of recesses formed at intervals on the same plane in the mold in a shape corresponding to the external shape of the fret body excluding the base end of the fret. step, and in the cavity of the mold,
Synthetic resin material is injected and pressurized, and with this synthetic resin material,
A method for manufacturing a neck structure, comprising the steps of forming a neck and integrally molding each proximal end of the plurality of frets and the neck. (5) A stringed instrument characterized in that the neck structure according to claim 3 and the body are integrally molded from a synthetic resin material. (6) Each of the fret bodies of the plurality of frets is placed in a plurality of recesses formed at intervals on the same plane in the mold in a shape corresponding to the external shape of the fret body excluding the base end of the fret. step, and in the cavity of the mold,
Synthetic resin material is injected and pressurized, and with this synthetic resin material,
A method for manufacturing a stringed musical instrument, comprising the steps of integrally molding a body and a neck protruding from the body, and integrally molding base end portions of each of the plurality of frets and the neck.