JPH1115472A - Electromagnetic transducer for guitar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a volume and a signal output so as not to be reduced in a pickup and to make the vibration of a stringe so as not to be reduced by allowing at least either the first electromagnetic transducer of a high-pitched tone range side or the second electromagnetic transducer of a low-pitched tone range side to perform an electromagnetic transducing till the neighborhood of the central line and eliminating a vacant area. SOLUTION: In the first electromagnetic transducer 1 of an electromagnetic transducer 41, a coil 3 is wound around a pole piece magnet 5 and in the second electromagnetic transducer of it, a coil 4 is wound around a pole piece magnet 6. At least one of the pole piece magnets 5, 6 is inclined in the range from 5 degrees to 60 degrees with respect to the traversing direction of a string. The pole piece magnets 5, 6 are arranged so as to be in contact or overlapped with respect to a central line 30 at the vicinity of the central line 30. Thus, even when the stringe is moved to the vicinity of the central line 30, the pole piece magnets 5, 6 and the coils 3, 4 exist and an electromagnetic conversion efficiency is maintained and the reduction of the volume is not large in the pickup and the vibration of the string is not largely reduced in the driver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic converter, that is, a pickup or a driver used for a guitar, particularly an electric guitar or an electric bass guitar.

[0002]

2. Description of the Related Art Conventionally, electromagnetic converters, ie, pickups and drivers, used for this type of electric guitar or electric bass guitar are roughly classified into a single coil and a humbucker coil. Is included in the string vibration signal, and there is a disadvantage that the tone is impaired. Therefore, a humbucker pickup was invented, and a pickup without hum noise was used. However, this humbucker pickup has a problem that the size is large as shown in FIG. 7 to FIG. 9 and the timbre is thick in FIG. 9 and the harmonic components are reduced. There is also a single-size humbucker pickup shown in FIG. 10, but this short-circuits the magnet in the high-frequency range and the magnet in the low-frequency range near the center line 30, thereby reducing the efficiency of the electromagnetic converter and reducing the string. It is less commonly used because the signal decreases sharply. The center line 30 is a very important line in guitar performance, because when the string is choked with a finger and pushed up, the string is frequently located on the center line. In particular, it is not preferable that the volume is reduced when the performance is enhanced by choking. Furthermore, in recent years, a string vibration sustaining device that uses a screwdriver to swing the string and maintain the string vibration has been used.In this case, in order to operate stably even during chalking, input is required. When the signal decreases,
The output is also temporary, but decreases, which causes a problem because the string vibration decreases or the string vibration stops.

A conventional electromagnetic converter will be described in detail with reference to the drawings. An electromagnetic converter of the magnetic field line attenuator type has a configuration shown in FIGS. Hereinafter, the electromagnetic transducer is generally referred to as an electromagnetic transducer in the sense of a pickup or a driver. In FIG. 7, a bar-shaped pole piece magnet 55 is shown. The first coil 56 and the second coil 57 are arranged in a stack around the alnico magnet, and the first coil 56 and the second coil 57 are wired in a reverse direction, or the winding direction of the coil is reversed, and This is a humbucker configuration that cancels hum noise. When lines of magnetic force are stretched around the strings 11 to 16 and the strings vibrate, the magnetic flux density around the strings changes, which results in a change in magnetic flux passing through the coil, and a signal is generated as a voltage in the coil.

In FIG. 8, a bar-shaped pole piece magnet shown in FIG. 7 is replaced with a columnar pole piece magnet. When viewed as a pickup, the pole piece is cylindrical, so that when the string vibrates, the signal output changes between just above the pole piece 60 and between the pole pieces.

The magnetic line attenuator pickup and driver shown in FIG. 9 are twice as large as those in FIGS. 7 and 8, and the output voltage is correspondingly increased. The first coil 71 is wound around the N-pole cylindrical pole piece 70, and the second coil 72 is wound around the other S-pole pole piece 73. The winding direction is the same as in FIGS. Is reversed or the wiring is reversed. The columnar pole piece 70 and the columnar pole piece 73 are in contact with the magnet 74 to apply a magnetic force to the pole pieces 70 and 73.

A humbucker pickup shown in FIG. 10 includes a columnar pole piece magnet 80 and a columnar pole piece magnet 83 magnetized in the opposite polarity to the pole piece magnet 80. A first coil 81 is wound around the columnar pole piece magnet 80. A second coil 82 is wound around the columnar pole piece magnet 83, and the first coil 81 and the second coil 82 are wound in reverse to form a humbucker.
Alternatively, the wiring is reversed and connected. In this pickup, the magnetic force of the high frequency range and the low frequency range is short-circuited to the center line 30,
There is a region 30 where the magnetic force is sparse or not, and therefore, in this region, the efficiency of the electromagnetic converter is reduced, and there is a dead region where the signal output of the pickup is sharply reduced.

[0007]

The conventional single-coil and humbucker-type electromagnetic converter has the following problems in addition to the above-mentioned problems.

In the humbucker electromagnetic transducer having a stack shown in FIG. 7, since the coils are stacked in two stages in the pickup and the driver, the stacked length is long and the outer size is deep, and the coil is a copper wire. There is a problem that the coil becomes heavy in two stages. Furthermore, when used as a pickup, the first coil 56 and the second coil 57 are attached to the same bar-shaped pole piece magnet 55.
Are close to each other, the output of the first coil 56 and the output of the second coil 57 are similar, and if a reverse connection is made to form a humbucker, or if the coil 56 and the coil 57 are wired in reverse winding, external hum noise is reduced. Also, there is a problem that the string vibration signal output is reduced and the signal output is reduced.

Also, when used as a driver, the magnetic force radiated by the first coil 56 and the second coil 57 is short-circuited between the coils similarly to the pickup, and the driving force for swinging the strings is small. There is also. In particular, there is a case where the first string cannot be driven because the string has a small mass and a high tension. Also, due to the poor conversion efficiency of the electromagnetic converter,
There is also a problem that the driving current for driving increases.

The humbucker of the stack shown in FIG. 8 has the same problem as that of FIG. In addition, in the case of FIG. 8, when used as a driver, because of the cylindrical pole piece magnet 60, the magnetic force between the pole pieces becomes thin, and the driving force is significantly reduced when the strings move to this position. is there. When used as a pickup, the string vibration signal output is reduced, but this can be enjoyed as a change in tone, which is not as problematic as a driver, but in a powerful and exciting performance, pushing the string up or down with a finger In such a case, there is a problem that the sound volume is decreased when the strings move between the pole pieces. In order to eliminate such a change in volume, an effect device called an effector is connected to the guitar to perform.However, connecting an effector changes the tone, losing the original tone, and degrading the tone. Is not preferred.

[0011] The humbucker electromagnetic converter of the double columnar pole piece shown in FIG. 9 is generally widely used. Since the first coil 71 and the second coil 72 are arranged apart from each other, interference between the coils as shown in FIGS. 7 and 8 is small, so that a large signal output can be obtained efficiently as an electromagnetic converter. However, in this pickup, since the first coil 71 and the second coil 72 detect the string vibration at a position apart from the strings, the string vibration is opposite between the columnar pole piece 70 and the columnar pole piece 73. Occurs, the string vibration signal output decreases or is not output. In other words, the string vibrates at higher harmonics, and in terms of timbre, a harmonic tone component is small in the signal output, resulting in a muffled timbre. For this reason, musicians who do not like this tone use a single coil pickup, even if there is hum noise. In addition to the problem of the tone, there is also a problem that the size is twice as large as the single size, and there is a restriction on a mounting position when mounting on a guitar.

Further, since the pole pieces 70 and 73 are columnar in shape, the magnetic flux density (magnetic force) between the pole pieces becomes low, so that the electromagnetic force is generated between the coils as in FIG. There is a problem that the conversion efficiency deteriorates, the string vibration signal output decreases as a pickup, and the driver becomes difficult or unable to swing the string as a driver.

The electromagnetic transducer shown in FIG.
The columnar pole pieces 80 and 83 are arranged in a row and have a first coil 81 and a second coil 82 which are single size in appearance, but these two coils are reversely wound or wiring is reversely connected. It functions as a humbucker pickup. The columnar pole piece magnets 80 and 83 are arranged in opposite directions of magnetization. Further, the columnar pole piece magnets 80 and 83 have the same tone as the single coil pickup, and the tone like the double size humbucker in FIG. But,
In this pickup, near the center line 30, there is a portion where the high-tone-side pole piece magnet 80 and the low-tone-side pole piece magnet 83 are short-circuited in space and have no or low magnetic flux density. This central line 30
In the vicinity, there is a problem that the signal output of string vibration decreases significantly, and despite having good humbucker characteristics,
Not widely used. In particular, in guitar playing, a chalking technique in which a string is choked with a finger near the center line is often used. Therefore, it is not preferable that the volume is reduced when the choke is performed because it lacks power. Specifically, in the case of a 6-string guitar, when the third string is pushed up with a finger to raise the pitch from a semitone to about two notes, or when the fourth string is depressed with a finger and the pitch is similarly raised from a semitone to about two notes, is there. Even bass guitars have the same problems as guitars, such as a 4-string bass with 4 strings, a 5-string bass with 5 strings, and a 6-string bass with 6 strings.

Further, when used as a driver, the lines of magnetic force are radiated from the columnar pole pieces 80 and 83 toward the strings in order to swing the strings. Since the magnetic flux density is low and the magnetic force is weak because they are farther apart, the driving force of the strings is weak between the pole pieces 80 as in FIGS. There is a problem that does not move or the strings cannot swing.
Drivers are more demanding than pickups for the following reasons: When driving a string, unlike a pickup,
Since the string begins to move by injecting energy exceeding the string's air resistance into the string, the string starts to swing only after outputting a certain amount of energy, that is, driving force, toward the string. In the pickup, a string is pinched with a finger to cause initial vibration, and a process of attenuating due to air resistance is obtained as a string vibration signal output by the pickup. This does not mean that there is no string vibration signal output unless the amount is equal to or more than a certain fixed amount.

Further, when used as a driver, the pole pieces 80 and 83 have the same shape, and the first coil 81
And the second coil 82 have the same specifications, so that the driving force of each string, that is, the electromagnetic conversion efficiency, is the same, so that a string with a strong and thin tension like the first string on the high-tone side and a thick string with a weak tension are compared. Then, the mass of iron to be adsorbed is less for one string, and with the same line of magnetic force, the third string can swing much better,
The string vibration sustaining device has a problem that the string vibration is greatly different between the first string and the third string during operation. Other strings also have greatly different swinging string vibrations. Further, at the position of the pole piece 80 and the pole piece 83, in the center line 30, the pole piece magnet 80 on the high frequency side and the pole piece magnet 83 on the low frequency side are positioned near the center line 30, and the magnetic field lines N of the pole piece magnet 80. The pole and the magnetic field line S of the pole piece magnet 83 are short-circuited, and there is a portion where the magnetic flux density is low or no magnetic flux exists. In this portion, when used as a pickup, when choking the third and fourth strings, the string vibration signal output sharply decreases. When used as a driver, when the string vibration sustaining device is operated and the third and fourth strings are choked, the vibration of the strings is weakened, and the vibration of the strings stops on the center line 30.

As described above, the conventional electromagnetic converters shown in FIGS. 7 to 10 have many problems, and the present invention provides a single-size electromagnetic converter, that is, a pickup or driver, which solves these problems. The purpose is to do. Pickups include single coils and humbuckers. FIG. 13 shows the case of a single coil. As a humbucker, even when the external hum noise is canceled and the finger is moved in the vicinity of the center line by choking, the string vibration signal output does not greatly decrease, and even with one string, the string vibration signal output becomes three strings. Similarly, the object is to obtain a large signal output in terms of audibility, and to achieve a tone that does not remain as shown in FIG. In addition, it can be easily applied to a covered type pickup having no opening on the surface facing the string as shown in FIG. 11, a type in which a cylindrical pole piece is visible, and a type in which a bar-shaped pole piece is visible. The purpose is. It is another object of the present invention to adjust the volume and the amount of string vibration according to each string as a single-coil electromagnetic transducer. Furthermore, it is also intended to have a good tone like a single coil. It also aims to obtain a good hum cancellation function as a humbucker.

The driver is a humbucker driver of a single size and outputs two lines of magnetic force.
This is a humbucker type that outputs reverse rotation with two coils and is less affected by the lines of magnetic force that drive the strings around. In addition, when the chords 3 and 4 near the center line are moved with a finger, the vibration of the strings is reduced. The goal is to obtain a driver that is less or the same, or in other words, does not change or does not significantly decrease the electromagnetic conversion efficiency. Further, it is intended to provide a driver that can obtain a string vibration such that a string such as a first string having a high tension and a small mass is equal to or different from other strings. Further, in a string such as a five-string which is thick and has a lot of iron mass, the string may vibrate excessively, and it is also an object to be able to adjust the driving force according to each string. Furthermore, like a pickup,
It also aims to be easily changeable in appearance.

[0018]

SUMMARY OF THE INVENTION In order to achieve the above object, a pickup or driver which is an electromagnetic converter for a guitar according to claims 1 and 2 of the present invention comprises:
2, 3, 4, 5, 12, 13, and 14. FIG. 1 is a plan view of the inside of the cover case 8 with a part removed, and the electromagnetic converter 41 is composed of a first electromagnetic converter 1 on the high-tone side and a second electromagnetic converter 2 on the low-tone side. The coil is wound around the pole piece magnet 5 in the first electromagnetic converter 1, and the coil 4 is wound around the pole piece magnet 6 in the second electromagnetic converter 2. Instead of the pole piece magnets 5 and 6, a bar-shaped or columnar iron magnetic conductive member may be used as the pole pieces 5 and 6, and a magnet may be fixed to the bottom of the pole pieces in order to apply magnetic force. At least one of the pole piece magnets 5, 6 is connected to the transverse direction 31 of the chord shown in FIG.
The pole piece magnet 5 and the pole piece magnet 6 are arranged near the center line 30 so as to be in contact with or overlap with the center line 30. In other words, the pole piece magnet 5 and the pole piece 6 are disposed at an angle in the cover case 8 and are vertically separated from each other at the center, but are close to the center line 30 at the first electromagnetic conversion. Piece magnets 5 and 6 of the second electromagnetic transducer 2 below the device 1
Are arranged so as to touch or overlap with the center line 30. The pole piece magnet 5 has an N pole on the surface facing the string, and therefore, the pole piece magnet 6 has an S pole on the surface facing the string. But,
The present invention is not limited to this, and the pole piece magnet 5 may be an S pole and the pole piece magnet 6 may be an N pole.
As the pole piece magnets 5 and 6, ferrite magnets or alnico magnets can be used. When picking up, the coils 3 and 4 are wound 1,000 times with a urethane wire having a wire diameter of 0.05 mm, and in the case of a driver, are wound 300 times with a urethane wire having a wire diameter of 0.2 mm, but are not limited thereto. .

The electromagnetic converter shown in FIG. 2 is a side view of FIG. 1 as viewed from the side. In FIG. 2, a sub pole piece 9 not shown in FIG. 1 is attached. Also, the magnets 17, 1
Numeral 8 is necessary when the pole piece magnets 5 and 6 themselves are iron magnetic conducting members, and is unnecessary when the pole pieces 5 and 6 are magnets. The same applies to the magnetic attenuator 28, the amplifier 10, and the electric wire 19. Although a configuration for fixing the first electromagnetic converter and the second electromagnetic converter is not shown, they are fixed with a filler of epoxy resin or silicone resin.

The electromagnetic transducers shown in FIGS. 3 to 5 show only the basic parts, excluding the cover case 8, the subpole pis 9 and the magnetic field line attenuator 28. In the electromagnetic converter shown in FIG. 3, the pole pieces 5 and 6 are iron magnetic members, and have magnets 17 and 18 for magnetizing the magnetic members. The pole pieces 5 and 6 and the magnets 17 and 18 may be combined into one piece to form the pole piece magnets 5 and 6. The coils 3 and 4 are the same as in FIG. At least one of the pole pieces 5, 6 has a part of the coil inclined from 5 degrees to 60 degrees with respect to the transverse direction 31 of the chord shown in FIG. 5 and the pole piece magnet 6 in the center line 30
To be in contact with or to overlap. In other words, the pole piece magnet 5 and the pole piece magnet 6 are inclined in the cover case 8 and are vertically separated at the center portion, but are separated near the center line 30, but are separated from each other by the first Either the pole piece magnet 5 of the electromagnetic transducer 1 or the pole piece magnet 6 of the second electromagnetic transducer 2 below touches the center line 30,
Alternatively, they are arranged so as to overlap. Coil 3 and coil 4
Are arranged in a line in the transverse direction 31 of the string. The base plates 7, 33 and the slit 43 do not relate to claim 1. The first electromagnetic transducer 1 has a coil 3 wound around an iron pole piece 5. The second electromagnetic transducer 2 has a coil 4 wound around an iron pole piece 6. The relationship between the winding directions of the coils and the polarities of the magnets 17 and 18 are the same as in FIGS. The magnets 17 and 18 are necessary when the pole pieces 5 and 6 are magnetically conductive members.
Not required if is a magnet.

In the electromagnetic converter shown in FIG. 4, coils 3 and 4 are wound around pole pieces 5 and 6, similarly to FIG. In the figure, the first electromagnetic transducer 1 and the second electromagnetic transducer 2 are not arranged in a line in the transverse direction 31 of the string, are not inclined, and are arranged with a step parallel to the transverse direction 31 of the string. . The pole piece 5 and the pole piece 6 are in contact with or overlap the center line 30 near the center line 30 as in FIG. If the pole pieces 5 and 6 are magnetized, the magnets 17 and 18 can be omitted.

The electromagnetic transducer shown in FIG. 5 has a coil shape different from that of FIGS.
You are using Further, coils 3 and 4 are connected to the center line 3
It is deformed and bent just before zero, and is extended to the pole pieces 26 and 25 near the center line 30. Further, the third coil 24 is disposed near the center line 30. As for the third coil 24, the coil 3 may be extended and the third coil may be omitted. The base plate 7, the slits 43, the gaps 23 and the like are the same as in FIGS.

In the pickup according to the third aspect, as shown in FIGS. 1 to 5 and FIGS. 12, 13, and 14, the diameters of the copper wires of the coils 3 and 4 in the configuration described in the first and second aspects are described. But it is as thin as 0.02mm to 0.1mm,
This is wound around the coil several hundred times or more. In order to form a humbucker, the winding directions of the coils 3 and 4 are reversed or the wirings are reversed and connected. The magnetic poles of the pole piece on the high frequency range side and the pole piece on the low frequency range side are arranged to be reversed. Also, when the amplifier 90 shown in FIG. 2 is provided,
The coil diameter and the number of windings can be used because the amplifier 90 amplifies the string vibration signal even if the winding diameter is large and the number of windings is small.

In the driver according to the fourth aspect, as shown in FIGS. 1 to 5 and 12, 13, and 14, the wire diameter of the coils 3 and 4 is 0.1 mm or more, and the number of turns is 200 mm or less. It will be around. Figure 2 for driver
Can be used as a pickup by using the amplifier 90 of FIG.

In the electromagnetic converter according to the fifth aspect, as shown in FIGS. 1 to 4 and FIGS. 13 and 14, except that the pole piece uses a bar-shaped magnet or a columnar magnet. The structure is the same as in the first to fourth aspects. The magnets 17, 1 in FIGS.
8 is unnecessary.

In the electromagnetic converter according to the sixth aspect, as shown in FIGS. 1 to 5 and FIGS. 12, 13, and 14, the pole pieces 5, 6, 26, 27, and 25 use an iron magnetic conductive member.
In order to further apply a magnetic force to the coil, the magnets 17, 1
Except for the arrangement of the coil 8 below the coil, the configuration of each part is the same as that of the first to fourth aspects. Iron from 1mm to 6
mm. As the magnet, ferrite or alnico magnet of 1 mm to 7 mm can be used.

As shown in FIGS. 1 to 5 and FIGS. 12, 13 and 14, the electromagnetic converter according to the seventh aspect is the same as the first to sixth aspects, except that the pole pieces 5, 6 are different. The sub-pole piece 9 is fixed on the upper part. Since the pole pieces 5 and 6 are inclined, the sub pole piece 9
If it cannot be fixed, it is fixed to the cover case 8. FIG.
Although the column shape is used in this example, the shape is not limited to this, and may be a bar shape or a substantially square shape. The material of the sub pole piece 9 may be a magnetic member made of iron or a magnet. When the shape is a column, it may have a diameter of 5 mm and a thickness of 0.1 mm or more.

In the electromagnetic transducer according to the eighth aspect, as shown in FIGS. 1 to 6, the base plate 7 is newly provided with the pole piece magnet 5 in the structure of the first to seventh aspects.
6, or when the coils 5, 6 are magnetically conductive members, the base plates 7, 3 below the magnets 17, 18.
3 is arranged. Further, a slit 10 having a thickness of about 1 mm is provided in the vicinity of the center line 30 with a thickness of about 1 mm in the base plate 7 using an iron magnetic conductive member. The base plate 7 connects the first electromagnetic transducer 1 and the second electromagnetic transducer 2 to one another.
Is fixed to two base plates 7, so that the slit 1
0 prevents the magnets of the electromagnetic transducers 1 and 2 from flowing through the base plate 7 and causing a short circuit. Further, the base plate 7 is not divided into one, but is divided into two base plates 7 and 33.
A configuration in which a gap 23 of 0.1 mm or more is provided so that the magnetic force is not short-circuited by contact of the magnetic force 33 may be employed.

In the electromagnetic transducer according to the ninth aspect, as shown in FIGS. 1 to 6 and 14, the base plate 7,
At least one or more of the slits 43 and the projections 34 and 35 are provided on 33. The structure of the electromagnetic converter is described in claim 1
To 8, and new base plates 7, 3
3 shows the magnetic flux density of the magnetic lines of force 95 flowing out of the pole piece magnets 5 and 6 or the magnets 17 and 18.
The mass and tension of the strings vary depending on the position of each string by making the shape of a fan or a substantially inverted fan look outward from the original attached by the slit 43 and increasing or decreasing the magnetic flux density of the magnetic force lines 95 while flowing through the inside. For this reason, it is possible to prevent variations in the volume of the pickup and variations in the string vibration of the driver. When the slit 43 is cut into the base plates 7 and 33, the shape is not limited to a substantially fan shape, but may be another shape. In a substantially fan shape, the magnetic flux density spreads as it approaches the edge of the base plate, so that the magnetic flux density decreases as compared to the case without the slit. In the case of a substantially inverted fan shape,
On the contrary, it increases. Slit width is from 0.1mm to 2mm
Can be used up to about. For the same purpose as the slit 43, a substantially square hole may be provided at the edge of the base plate 7, 33. As a result, the timbre changes, but the timbre further changes in a complicated manner. When a substantially triangular projection is provided at the edge of the base plates 7 and 33, the magnetic flux density changes finely at the edge similarly to the slit 43. As for the strings, when the strings vibrate, the magnetic flux density varies, so that the signal output of each string changes in accordance with the density, resulting in a complex good tone.

In the electromagnetic converter according to claim 10, FIG.
As shown in 2, 11, 12, 13, and 14, the pole piece magnets 5, 6 and the coils 3, 4 are sealed in the cover case 8 with a filler such as an epoxy resin or a silicone resin.
As the cover case 8, as shown in FIG. 11, a covered type having no opening on the surface facing the string is used.

In the electromagnetic converter according to claim 11, FIG.
As shown in FIG. 2, a magnetic line attenuator 28 made of aluminum or copper is fixed to the bottoms of the coils 3 and 4. If there is a base plate 7, it is fixed to the bottom of the base plate 7. The magnetic field line attenuator has an outer length of 3 mm, a width of 15 mm and a thickness of 0.05 mm or more. The effect of attenuating the lines of magnetic force increases as the thickness increases. The minimum configuration is to enclose the coils 3 and 4, the pole piece magnets 5 and 6, and the magnetic field line attenuator 28 in the cover case 8 with a filler. Since the magnetic field line attenuator weakens the magnetic field lines by blocking the paths of the magnetic field lines, the strings and coils that are not in the path of the magnetic field lines have almost no effect.

In the electromagnetic converter according to claim 12, FIG.
As shown in 3 and 14, it is a single coil type,
Not a humbucker. The coil 3 is wound around the pole piece magnet 5, and the base plate 7 is disposed on the bottom of the coil 3 or the pole piece magnet 5. The base plate 7 is provided with at least one of a slit 43 and projections 34 and 35. Base plate 7
The magnetic flux density of the magnetic field lines 95 flowing out of the magnet is substantially fan-shaped or substantially inverted fan-shaped when viewed from the position where the magnet is attached by the slit 43, and the magnetic flux density of the magnetic field lines is increased or decreased while flowing through this, so that each string is increased. Since the mass and the tension of the strings are different depending on the position, the variation of the volume of each string is prevented by the pickup, and the variation of the string vibration of each string is prevented by the driver. Slit 43 into base plate 7
In the case of cutting, the shape is not limited to a substantially fan shape, but may be any other shape. In a substantially fan shape, the magnetic flux density spreads as it approaches the edge of the base plate, so that the magnetic flux density decreases as compared to the case without the slit. In the case of a substantially inverted fan shape, it increases in reverse. The slit width should be between 0.1 mm and 2
It can be used up to about mm. (Refer to FIGS. 4 and 6.) Although not shown in the figure for the same purpose as the slit 43, a substantially square hole may be provided at the edge of the base plate 7 as in FIG. Thus, the timbre changes. However, if a substantially triangular protrusion is provided on the edge for further changing the timbre in a complicated manner, the magnetic flux density changes finely at the rim similarly to the slit 43. When the string vibrates, the magnetic flux density varies, so the signal output changes accordingly.
A complex good tone.

[0034]

The electromagnetic converter constructed as described above has a pole piece and a coil even when the string moves near the center line, maintains the electromagnetic conversion efficiency, and does not greatly reduce the volume of the pickup. The driver does not significantly reduce the string vibration. Further, since the tone is close to the center line of the pole piece, the tone output is a signal output even up to the minute vibration of the strings, and the tone tone is the same as that of a single coil pickup. Further, when the sub pole piece is attached, the appearance becomes the shape of a general electromagnetic transducer. In addition, when a sub pole piece is attached, the magnetic force of the pole piece magnet is promoted to radiate closer to the string,
The efficiency of the electromagnetic transducer is locally increased. This action increases the signal output of the pickup. The driver can swing with a small current that causes string vibration. Further, when the sub pole piece is attached, the magnetic field becomes complicated due to the cylindrical shape, and the timbre of the pickup changes in a complicated manner, thereby improving the timbre. Furthermore, when the sub pole piece is a magnet, the magnetic force is added to the pole piece magnet,
The magnetic flux density near the string increases, that is, the magnetic force increases,
Electromagnetic conversion efficiency increases. When the sub pole piece is made of iron magnetic material, it is easy to change the shape easily, so various sub pole piece shapes can be made, the internal electromagnetic transducer is common, and various types with different appearances are designed It is possible to do.

When the base plate is attached to the electromagnetic transducer, radiation to the bottom of the pole piece magnet is deflected in the horizontal direction and approaches the string, so that a strong magnetic field is applied to the string and electromagnetic conversion efficiency is increased. Further, the slit near the center line of the base plate prevents the magnets of the first electromagnetic transducer and the second electromagnetic transducer from being short-circuited at the base plate. Further, a slit is cut in the base plate, and the shape of a substantially fan shape or a substantially inverted fan shape changes the magnetic flux density flowing through the base plate. This effect is similar to the case where there is no slit in the substantially fan shape spreading at the edge of the base plate,
The magnetic flux density decreases. In the case of a substantially inverted fan shape, it increases at the edge of the base plate. When a square hole is formed in the edge of the base plate, the operation is substantially the same as that of an inverted fan. Providing a substantially triangular projection on the edge of the base plate has the same effect as the substantially inverted fan shape. Even if the protrusion is bent in an L shape, the magnetic flux density near the string increases. Because of these shapes, the magnetic flux density near the strings changes, so that the electromagnetic conversion efficiency also changes. In the pickup, the magnitude of the signal output of each string can be adjusted, and the tone can also be changed.
The driver can adjust the magnetic flux density near each string, so the driving force can be adjusted optimally for each string. Furthermore, since the coil is close to the humbucker, hum noise can be effectively canceled. As the driver, the coil that outputs the lines of magnetic force approaches and reversely rotates, so that there is an effect that the driving lines of magnetic force are not unnecessarily emitted to the surrounding pickup.

[0036]

Embodiments will be described with reference to the drawings.
FIGS. 1 to 6 and FIGS. 11 to 14 show various embodiments. 7 to 10 show a conventional electromagnetic converter. FIG. 11 shows an electromagnetic transducer having no opening on the opposing surface of the string. FIG. 12 shows the transverse direction 31 of the chord and the center line 30.
FIG. 13 shows an example in which the base plate 7 is provided in a single-coil type electromagnetic transducer. FIG. 14 shows magnetic field lines 95 flowing through the base plate 7 and magnetic field lines 95 around the strings 11. In FIG. 1 of FIG.
FIG. 2 is a plan view of the electromagnetic converter of the humbucker when a part of a cover case 8 of the electromagnetic converter 41 is removed. The electromagnetic converter 41, that is, a pickup or a driver, fixes the first electromagnetic converter 1 and the second electromagnetic converter 2 to the cover case 8 with an epoxy resin or a silicone resin with a filler. The first electromagnetic converter 1 on the high frequency range has a coil 3 wound around a pole piece magnet 5, and the second electromagnetic converter 2 on the low frequency range also has a coil 4 wound around a pole piece magnet 6. The pole piece magnet 5 has an N pole on the surface facing the string. The pole piece magnet 6 has an S pole. However, the polarity is not limited to this, but may be any relationship as long as the pole piece magnet 5 and the pole piece magnet 6 are reversed. The coils 3 and 4 are reverse-wound or reverse-wired and connected in parallel or in series to form a humbucker. As shown in FIGS. 1 and 12, the first electromagnetic transducer 1 and the second electromagnetic transducer 2 are arranged at an angle of 5 to 60 degrees with respect to the transverse direction 31 of the string. FIG.
Is about 20 degrees. The pole piece magnet 5 and the pole piece magnet 6 are disposed so as to contact or overlap the center line 30 near the center line 30.
Although not shown, the inclination may be only the first electromagnetic converter 1 or only the second electromagnetic converter 2. Cover case 8
May have a shape without an opening as shown in FIG. Further, a hole having a diameter of 5 mm may be provided as shown in FIG. 12, and the sub pole piece 9 may be provided as shown in FIG.
The pole piece magnets 5 and 6 use ferrite magnets or alnico magnets, and have a length of 4 mm, a width of 31 mm and a depth of 5 mm. The coils 3 and 4 are made of a single urethane wire, and in a pickup, a wire diameter of 0.05 mm is wound 1,000 times or more. With a screwdriver, 0.2 mm is wound 200 times. The electromagnetic converter functioning as a humbucker is obtained as described above.
And a sub pole piece 9 and magnets 17 and 18 (see FIG. 2).

For example, the base plate 7 is provided for the purpose of adjusting the volume of each string in the pickup, and the driver is provided with the base plate 7 for the purpose of adjusting the amount of vibration of each string, that is, the driving force. (See FIG. 14) When the base plate 7 is provided, the signal output changes as a pickup, and the electromagnetic conversion efficiency changes. The driver can adjust the string vibration. The base plate 7 is an iron plate and is 1.2 mm. The base plate 7 deflects the radiation of the lines of magnetic force to the bottoms of the pole piece magnets 5 and 6 in the lateral direction. (See FIG. 14) Base plate 7
In the vicinity of the center line 30, there are two slits 10 having the same thickness as the plate thickness, leaving a central portion 2 mm.
As a result, the pole piece magnet 5 on the high frequency side and the pole piece magnet 6 on the low frequency side are aligned with the center line 3.
At 0, the magnetic force is short-circuited through the base plate 7 and prevented from weakening. In addition to the above, the base plate 7 may be provided with a slit 43 shown in FIG. The slit 43 is a slit having a width approximately equal to the plate thickness. The slit 43 adjusts the volume of each string in the pickup, and the driver adjusts the vibration amount of each string, that is, the driving force, in the driver. The slit 43 of the base plate 7 changes the magnetic flux density and controls the magnetic flux radiation balance. Each slit 4
Reference numeral 3 denotes a slit which is symmetrical in the vertical direction with respect to the transverse direction of the chord, and spreads in a substantially fan-like shape toward the end of the base plate 7 from the central portion where the pole piece magnets 5 and 6 are attached, or narrows in a substantially inverted fan-like shape. As a result, the magnetic flux density decreases or increases as compared with the case where the slit 43 is not provided, and this increase / decrease affects the electromagnetic conversion efficiency of the strings 11 to 16 located directly above, and as a pickup, This results in an increase or decrease in volume and an increase or decrease in signal output. As a driver, a driving force adjustment for swinging the strings 11 to 16 is provided. In some cases, it is not necessary to be vertically symmetric. In the case of a substantially inverted fan shape, the magnetic flux density increases, and the signal output as a pickup increases. String vibration increases with the driver. On the other hand, in the approximate fan shape, on the contrary, in the pickup,
The signal output is reduced, and the string vibration is reduced in the driver.

The L-shaped projection 34 (FIGS. 1, 2, 6, 13)
Is an L-shaped bend of 2 mm at the tip of the base plate 7.
Move closer to the strings. Thereby, the magnetic flux density near the string is increased, and the same effect as that of the slit 43 can be obtained. Further, the square hole 53 (FIG. 6) having a side of 2 mm has a function opposite to that of the projection 34. The protrusion 35 has a substantially triangular shape with a side of 2 mm, and a large number of portions having a high magnetic flux density and a portion having a low magnetic flux density are arranged on the edge of the base plate 7 within a range in which one chord moves.
The tone of the signal output generated when each string vibrates has a complicated non-simple waveform, thereby improving the tone.

FIG. 2 is a side view of the embodiment shown in FIG. 1 as viewed from the side. Also shown are the sub-pole pieces 9, the magnets 17 and 18 that are hidden and invisible, the magnetic field line attenuator 28, the amplifier 90, and the electric wire 19 which are omitted in FIG. 1. These may function as electromagnetic transducers even if omitted in some cases. The sub-pole piece 9 has a diameter of 5 mm and a thickness of 2 mm by using an iron magnetic member in order to strongly output the magnetic lines of force of the pole piece magnets 5 and 6 from the strings 11 to 16 through the sub-pole piece 9. Further, the sub pole piece 9 may be an alnico magnet or a ferrite magnet instead of the iron magnetic member. Further, the shape may be a column shape or a bar shape. The magnets 17 and 18 can be omitted in the case of the pole piece magnets 5 and 6. The magnets 17 and 18 are fixed to the pole pieces 5 and 6 and are also fixed to the base plate 7. Magnet 17,
Reference numeral 18 denotes a ferrite or an alnico magnet. The size is the same as the pole pieces 5 and 6. Further, a magnetic field line attenuator 28 is provided at the bottom of the pole piece magnets 5 and 6, in this case, on the back surface of the base plate 7. The magnetic line attenuator 28 is mainly used as a driver, but also reduces external noise that jumps into the coils 3 and 4 even in a pickup.

In the driver, when the magnetic flux radiated from the coils 3 and 4 toward the bottom passes through the magnetic flux attenuator 28, an eddy current is generated in the magnetic flux attenuator 28, and the magnetic flux is directed in a direction opposite to the magnetic flux to be passed. Radiate, so that the lines of magnetic force passing through it become weaker. As a result, when used as a driver, the lines of magnetic force that swing unnecessary strings around can be avoided, and the tone of the pickup nearby is not spoiled. The outer dimensions are 15 mm in length, 50 mm in width, and 4 mm in thickness. Further, the amplifier 90 is fixed to the magnetic field line attenuator. As a pickup, the vibration signals of the strings extracted from the coils 3 and 4 are connected to an amplifier 90 made of a semiconductor amplifier or a transformer, and the vibration signals of the strings are greatly amplified. When used as a driver, the amplifier 90 need not be provided.

FIGS. 3 to 6 and the embodiment of FIG. 13 are plan views showing the inside of the electromagnetic converter with the cover case 8 and the sub pole piece 9 of the electromagnetic converter removed. In the embodiment of FIG. 3, the pole pieces 5 and 6 use an iron conductive member thickness of 1.2 mm, and are bent only in the vicinity of the center line 30 so as to be inclined like the inclined portion 79 so as to contact or contact the center line 30. To be overlapped. Also,
The base plate 7 and the base plate 33 are different from each other. Magnets 17, 18 are disposed between the pole pieces 5, 6 and the base plates 7, 33. Others are the same as FIG.

FIG. 4 is a plan view showing only the inside of the electromagnetic converter in the embodiment shown in FIG. 4 differs from FIGS. 1 and 3 in that the pole pieces 5, 6 are straight, and are arranged in parallel to the string transverse direction 31 without inclination. 1st electromagnetic transducer 1 and 2nd
The electromagnetic transducer 2 has the pole pieces 5 and 6 arranged at a step of 5 mm. The pole pieces 5 and 6 are in contact with or overlap the central line 30 near the central line 30. Lines of magnetic force 95 are radiated from the pole piece magnet 5 to the edges of the base plate 7, and the magnetic lines 95 are substantially inverted fan-shaped of the base plate 7 and the magnetic flux density is increased. I have.

The embodiment shown in FIG. 5 is the same as FIGS. 3 and 4 except that the pole pieces 5, 6 are not bar-shaped pole pieces but are columnar pole pieces having a diameter of 5 mm. 27, and a pole piece magnet 26, a small bar-shaped pole piece magnet 25, and a third coil 24 are disposed immediately below the center line 30. The pole piece magnet 27 uses a ferrite or an alnico magnet. In this case, the magnets 17 and 18 can be omitted. The coils 3 and 4 extend to the center line 30 and are wound around the coil 26 and the bar-shaped pole piece 25. The third coil 24 can be omitted in some cases.

FIG. 6 is a plan view showing only the base plate 7 described in the embodiment of FIG. 1 in the embodiment shown in FIG. The base plate 7 has slits 10,
43 In addition, a projection 35, an L-shaped projection 34 and a square hole 53 are provided. The specifications and functions of each part are as described in FIGS. Lines of magnetic force 95 are radiated from the edge of the base plate 7, and the magnetic flux density increases and decreases according to the shape.

In the embodiment shown in FIG. 11, it is a perspective view of a covered type cover case 8 having no opening on the surface facing each string. As the material, an ABS resin can be used. In the embodiment shown in FIG. 12, a hole 36 having a diameter of 5 mm is formed in the cover case 8 shown in FIG.
Or, a pseudo-picture is arranged to make it look the same as a general pickup or driver.

In the description of the above embodiment, an example in which the electromagnetic converter for a guitar according to the present invention is applied to a six-string guitar has been described. However, the present invention is not limited to this. The present invention may be applied to any guitar as long as a plurality of strings are stretched, such as a string bass guitar.

[0046]

The electromagnetic transducer, that is, the pickup or the driver configured as described above has the following effects.

At least one of the first electromagnetic converter on the high-frequency range and the second electromagnetic converter on the low-frequency range performs electromagnetic conversion to the vicinity of the center line, and there is no blank area. Therefore, the strings near the center line are choked with fingers. Therefore, even when moving to the center line, the pickup does not decrease the volume and the signal output, and the driver does not reduce the vibration of the strings.

Since the humbucker is constructed by incorporating the first electromagnetic converter and the second electromagnetic converter in a single-size cover case, a humbucker pickup and a humbucker driver are required to obtain a large size as shown in FIG. I can make it. For this reason, the degree of freedom of attachment to the guitar is high. Further, since the coils are arranged close to each other, good humbucker characteristics can be obtained.

Further, as the pickup, the timbre becomes the same timbre as the single size, and a good timbre can be obtained.
Unlike a humbucker as shown in FIG. 9, a high tone range does not decrease, and a good tone with many harmonic components is obtained.

When the string is used as a driver, the vibration of the string also becomes a vibration having a large number of harmonic components.

A driver can be obtained which has no opening on the surface facing the strings.

Since the appearance can be changed by the sub pole piece, various kinds of pickups and drivers can be shared with a common internal configuration.

Further, when the sub pole piece is attached, a string vibration signal output can be largely taken out as a pickup, and a string vibration can be oscillated strongly as a driver.

Further, when attached to a sub pole piece, the tone can be changed as a pickup or driver.
Enjoy this.

The coil 3 and the coil 4 are about half the length of the conventional one, and the tone and the tone are hardly deteriorated due to the inductance and the wire resistance of the coil, and a good tone can be produced.

Further, since the size of the coil and the magnet is about half of the conventional size, the production is easy and the cost is low.
Furthermore, the coil is apt to be broken at the time of production. Therefore, if the wire length is short, the productivity is good and the cost is low.

In the case of a covered type in a driver or a pickup, the internal coil and coil inclination can be filled and fixed with epoxy or silicone resin, thereby simplifying the operation. The process of immersing in a wax and then wiping it while wiping it with a cloth is no longer necessary.

When a single base plate is used, the first electromagnetic transducer on the high frequency range side and the second electromagnetic transducer on the low frequency range side are mounted on the same base plate, so that the number of parts is small and assembly is easy.

Since a single slit is provided in the center line of the base plate, the magnets of the first electromagnetic transducer and the second electromagnetic transducer are prevented from being short-circuited.

Further, since the base plate has slits in a substantially fan shape or a substantially inverted fan shape, the electromagnetic conversion efficiency can be adjusted according to each string, and the volume can be easily adjusted as a pickup according to each string. As a driver, the amount of vibration of each string can be adjusted optimally, and the driving force can be easily adjusted.

Further, the projections 34, 3 on the base plate
5. Due to the substantially square hole 53, the tone is changed in a complicated manner by both the pickup and the driver, and a good tone is obtained.

[0062]

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of an electromagnetic converter.

FIG. 2 is a side view in which a sub pole piece 9, magnets 17 and 18, a magnetic field line attenuator 28, and an amplifier 90 are attached to the first embodiment of the electromagnetic converter.

FIG. 3 is a plan view of only the internal components of the electromagnetic converter in the second embodiment of the electromagnetic converter.

FIG. 4 is a plan view of only the internal components of the electromagnetic converter in a third embodiment of the electromagnetic converter.

FIG. 5 is a plan view of only the internal components of the electromagnetic converter in a fourth embodiment of the electromagnetic converter.

FIG. 6 is a plan view of a base plate for controlling magnetic flux emission of the first to fifth embodiments of the electromagnetic transducer.

FIG. 7 is a perspective view of a stack type having a bar-shaped pole piece magnet in a conventional electromagnetic converter.

FIG. 8 is a perspective view of a stack type having a columnar pole piece magnet in a conventional electromagnetic converter.

FIG. 9 is a perspective view of a double size having a bar-shaped pole piece magnet in a conventional electromagnetic converter.

FIG. 10 is a perspective view of a single size having a bar-shaped pole piece magnet in a conventional electromagnetic converter.

FIG. 11 is a perspective view of a covered type cover case in the first to fifth embodiments of the electromagnetic converter.

FIG. 12 is a plan view of a cover case to which a sub pole piece is attached in the first to fifth embodiments of the electromagnetic converter.

FIG. 13 is a plan view of only the internal components of the electromagnetic converter in the fifth embodiment of the electromagnetic converter.

FIG. 14 is a sectional view in which a base plate 7 is attached to an electromagnetic converter.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 high-frequency first electromagnetic transducer 2 low-frequency second electromagnetic transducer 3 coil (first electromagnetic transducer) 4 coil (first electromagnetic transducer) 5 first pole piece (magnet or iron) 6 Second pole piece (magnet or iron) 7, 33 Base plate 8 Cover case 9 Sub pole piece (magnet or iron) 10 Slit (for short circuit prevention purpose) 11 1st string in high range (high range side) 12 2 in high range side Strings (high range side) 13 High range side 3 strings (high range side) 14 Low range side 4 strings (low range side) 15 Low range side 5 strings (low range side) 16 Low range side 6 string ( 17, 18 Magnet 22, 23 Pole piece (magnet or iron) 24 Third coil 25 Bar-shaped pole piece 26, 27 Pole piece 28 Magnetic field line attenuator 29 Mounting hole 30 Central lane 31 31 transverse direction of string 34 L-shaped projection 35 projection 36 subpole piece mounting hole 41 electromagnetic transducer (pickup or driver) 43 slit (for magnetic flux emission control purpose) 53 substantially square hole 55 bar-shaped pole piece magnet 56, 61, 71, 81 First coil 57, 62, 72, 82 Second coil 60, 70, 73 Columnar pole piece magnet 74 Magnet 77 Adhesive 79 Inclined part 95 Magnetic field lines (magnetic flux)

Claims (12)

[Claims] 1. A guitar musical instrument in which a plurality of strings (11 to 16) are stretched, arranged directly below a high-frequency range string (11 to 13) built in the same cover case (8). The first electromagnetic transducer (1) and a pole piece (5) disposed immediately below the lower string side string group (14 to 16) and adjacent to the first electromagnetic transducer (1). , 6) having a second electromagnetic transducer (2) disposed so as to overlap with the transverse direction (31) of the string,
The signal output of the vibration of the strings or the driving force for vibrating the strings at the midpoint (30) between the group of strings on the high range side (11 to 13) and the group of strings on the low range side (14 to 16) is applied to each string. Each signal output or driving force at the overlapping pole piece portion of each of the electromagnetic transducers (1, 2) is at least each compared to that directly below the strings so as not to attenuate it directly below (11 to 16). An electromagnetic converter for a guitar, comprising at least half. 2. A high-frequency range string group (1) in a guitar musical instrument having at least a plurality of strings (11 to 16).
1 to 13) and a second electromagnetic transducer (2) disposed directly below the low-pitched string group (14 to 16). A part of the pole piece (5) of the first electromagnetic transducer (1) or a part of the pole piece (6) of the second electromagnetic transducer (2) is housed in the cover case (8). Line (3
0), the pole piece (5) of the first electromagnetic transducer (1) is magnetized so that the pole piece (6) of the second electromagnetic transducer (2) is magnetized. The direction of winding of the coil (3) and the coil (4) is also reversed, or the wiring connection of the coil (3) and the coil (4) is reversed in accordance with the direction of the magnetic field. Part or all of the pole piece (5) and the pole piece (6) of the second electromagnetic transducer (2) may be in the transverse direction (3
1) is arranged at an angle of 5 degrees to 60 degrees with respect to 1) or is arranged on a step substantially parallel to the transverse direction (31) of the string, and the string (13) or the string ( 1
When the finger (4) is pushed and moved by the finger, the string (1) which is the original fixed position is moved.
3) or a signal output generated by vibrating the strings of each of the electromagnetic transducers (1, 2) or a driving force for swinging the strings as compared with a position immediately below the strings (14) or the electromagnetic conversion efficiency is at least constant. An electromagnetic transducer for a guitar, having at least half of each position. 3. The electromagnetic converter for a guitar according to claim 1, wherein the electromagnetic converter for a guitar is a pickup for converting vibration of a string into an electric signal. 4. The guitar electromagnetic converter is a driver for electromagnetically driving a string.
The electromagnetic transducer for a guitar according to any one of the above. 5. The electromagnetic for a guitar according to claim 1, wherein the pole pieces (5) and (6) are bar-shaped pole piece magnets or cylindrical pole piece magnets. converter. 6. The pole pieces (5) and (6) are magnetically conductive members, and are provided with magnets (17) and (18) for magnetizing the pole pieces (5) and (6). The electromagnetic converter for a guitar according to any one of claims 1 to 4. 7. The guitar according to claim 1, wherein at least one of the pole pieces (5) and (6) is provided with at least a sub pole piece (9). For electromagnetic transducer. 8. A base plate (7) for fixing the first electromagnetic transducer (1) or the second electromagnetic transducer (2) and controlling radiation of magnetic field lines, wherein the base plate (7) has A slit (1) for preventing a short circuit of each magnetic force of the first electromagnetic converter (1) and the second electromagnetic converter (2).
0) or a plurality of base plates (7),
Using (33), 0.1 m is used to prevent a short circuit between the magnetic forces of the first electromagnetic converter (1) and the second electromagnetic converter (2).
The electromagnetic converter for a guitar according to any one of claims 1 to 7, wherein a gap (23) having a length of not less than m and not more than 8 mm is provided. 9. A base plate (7) or a base plate (33) is disposed on the first electromagnetic converter (1) or the second electromagnetic converter (2), and the base plate (7) or (33) is provided on the base plate (7) or (33). The magnet (1) is used to control the change of timbre and increase / decrease of signal output by controlling the magnetic field radiation.
7), slits (43), L-shaped projections (34), projections (3)
5) The guitar according to any one of claims 1 to 8, wherein the magnetic flux density near each string is adjusted by forming at least one of the square holes (53). Electromagnetic transducer. 10. The guitar according to claim 1, wherein a surface of the cover case (8) facing the strings has no opening (36). Electromagnetic transducer. 11. A thickness of 0.03 m formed of a diamagnetic material such as aluminum or copper near the back surface of the base plate (7).
m and a line of magnetic field attenuator (5 mm in length and 10 mm in width)
The electromagnetic converter for a guitar according to any one of claims 8 to 10, wherein (8) is provided. 12. In a single coil or humbucker coil electromagnetic transducer, each string (11 to 16)
A base plate (7) is disposed at the bottom of the coil (3) or the pole piece magnet (5) to control the magnitude of the signal output of the loudspeaker. The lines of magnetic force emitted from the coil (3) and the pole piece magnet (5) are applied to the base plate by slits (43), L-shaped protrusions (34), protrusions (35), and square holes (53). An electromagnetic transducer for a guitar, wherein the magnetic flux density is increased or decreased by adjusting the magnetic flux density near each string.