JPH05158482A - Electromagnetic transducer for electric string instrument - Google Patents

Abstract

PURPOSE:To efficiently control balance and magnetic flux radiation amount of an electromagnetic transducer by providing a magnetic flux radiation polarizing means to a bar-type pole piece. CONSTITUTION:A bar-type pole piece 2 is provided with a magnetic flux amount increasing slit 6 which controls relative magnetic flux radiation amount to a string 51 and/or a control slit 7 which controls magnetic flux radiation balance corresponding to the each string 51. Although the magnetic flux of a magnet is radiated to the string 51 through the bar-type pole piece 2, since the magnetic flux amount increasing slit 6 acts as magnetic resistance due to magnetic void, the magnetic radiation in the right and left direction in a figure is suppressed to become the magnetic flux in the string direction, and the magnetic flux radiated into a surrounding area is also polarized to be concentrated into the string direction, relative magnetic flux amount thus increased. In addition, the radiation balance control slit 7 permits the magnetic flux of the magnet 3 to concentrate and radiate into the surrounding string 51, for example, the first string. In short, the magnetic flux radiation balance corresponding to the output or excitation force for each string 51 is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic transducer for an electric stringed instrument such as an electric guitar or an electric piano, and more particularly to an electromagnetic transducer having a bar type pole piece, which has a relative magnetic flux radiation amount to a string and / or each magnetic flux radiation amount. The present invention relates to an electromagnetic transducer for an electric stringed instrument, which is configured to efficiently control a magnetic flux radiation balance corresponding to a string.

[0002]

2. Description of the Related Art Generally, an electric stringed instrument such as an electric guitar or an electric piano has a plurality of strings, and a transducer or a pickup for converting the string vibration into an electric signal. This pickup is roughly classified into an electromagnetic pickup and a piezoelectric pickup. Especially, for example, in the case of an electric guitar, it is easy to obtain a sound character in which the midrange is emphasized, and it is difficult to mount it on the electric guitar body. Electromagnetic pickups have historically been widely used because of their ease and ease of electrical processing thereafter.

This electromagnetic transducer, that is, an electromagnetic pickup is typically constructed as shown in FIG. In the figure, (a) is a single coil type, (b)
Are called double coil type or humbucking type. The single coil type electromagnetic pickup 50 of (a) has the following configuration. That is, it has pole pieces 52, 52, ... Formed by a cylindrical magnet corresponding to a plurality of strings 51, 51 ,.
3 is wound around. Further, the humbucking type electromagnetic pickup 54 of (b) has a configuration in which two single coil type electromagnetic pickups 50 are arranged side by side, but two sets of pole pieces 56, 56 ... With a single magnet 55. , And 57, 57, ..., Each pole piece 56, 57 is formed of a magnetically permeable member in order to radiate a magnetic flux to the strings 51, 51 ,. In particular, this humbucking type electromagnetic pickup 54 has one pole piece 57, 5 so that the detection sensitivity can be adjusted for each string 51, 51, ....
7, ... Are formed by screw members. Incidentally, 58 is a bobbin, and 59 is a cover.

The principle of converting the string vibration into an electric signal in the electromagnetic transducer having such a structure, that is, the electromagnetic pickup, is as follows. That is, each of the pole pieces 52, 56, 57 forms a magnetic field with respect to the string 51, and the string 51, which is a magnetic body, makes an amplitude motion in the magnetic field, whereby an electric signal having a frequency corresponding to the string vibration is generated in the coil 53. The principle is that electricity is generated by. The electromagnetic transducer with such a structure, that is, the electromagnetic pickup has been used for a long time now, but this structure requires the pole piece corresponding to each string as described above, that is, the structure is complicated and the number of parts is large. However, there was a disadvantage that it increased. In addition, this type of electric guitar often uses a so-called choking or bending technique in which one of the important playing techniques is to change or pitch the pitch by moving the finger holding the string in parallel with the fret. However, when this playing method was performed, there was the inconvenience that the strings fell off right above the pole piece and the volume decreased.

In order to eliminate such inconveniences, in recent years, an electromagnetic transducer having a bar type pole piece as shown in FIG. 11, that is, an electromagnetic pickup has been widely used. This electromagnetic pickup 60, 61
Is a bar type pole piece 6 formed by a single plate-shaped magnet instead of the above-mentioned cylindrical pole piece.
2 or a pair of bar type pole pieces 64, 6 magnetically coupled to the magnet 63 and formed of a magnetically permeable member.
4 is a configuration having 4.

The bar type pole pieces 62, 64
Since the magnetic field is formed not by each string but by enclosing a plurality of strings, the volume does not decrease even when the choking or bending method described above is performed, and the number of parts is small and manufacturing is easy. However, it had the following disadvantages. That is, while the one using the cylindrical pole piece corresponding to each string was able to radiate the magnetic flux concentrated on the string, the one using the bar type pole piece included multiple strings. Since the magnetic flux is radiated over a wide area, the relative amount of magnetic flux radiation is also reduced, which has the disadvantage of affecting the volume and sound quality. In addition, the one using a cylindrical pole piece corresponding to each string can adjust the detection sensitivity of each string by the height of each pole piece, but the one using the bar type pole piece has a substantially upper end. Since it is formed in a straight line, it has a drawback that it is impossible to adjust the sensitivity balance for each string. This problem of sensitivity balance is remarkable in the strings at both ends of the plurality of strings, especially in the first string which is the thinnest and has relatively high tension. This is because the magnetic flux radiated by the bar type pole pieces 62, 64 is radiated not only in the chord direction but also in the circumferential direction as shown in FIG. Radiated as a result, that is, the magnetic flux density becomes smaller.

Several configurations have been proposed to alleviate such inconveniences. That is, in order to increase the amount of magnetic flux emitted relative to each string, there has been proposed a structure in which the top of a bar type pole piece is formed in a mountain shape corresponding to each string. According to this structure, magnetic flux similar to that of the cylindrical pole piece is radiated to each string, but when choking or bending performance is performed, it still has the same disadvantages as the conventional one. .. In order to reduce the output difference between the strings at both ends as much as possible, the upper end of the bar type pole piece is formed to be linear and flat. Although it is proposed that the strings are arranged close to each other (the strings are arranged such that the strings at both ends are low and the central part is high corresponding to the radius of the fingerboard of the neck), also in this case When choking the first string, the string is separated from the pole piece, so the output is also significantly reduced.

By the way, in recent years, a technique of using an electromagnetic transducer as an electromagnetic driver for exciting a string has been tried and put into practice. This applies the completely opposite principle of the action of the electromagnetic pickup that converts the string vibration into an electric signal. That is, the electric signal detected by the pickup is amplified by an amplifier and input to an electromagnetic driver, and the electromagnetic driver radiates magnetic energy to the string. The string is self-excited by this magnetic energy, It is configured to sustain vibrations endlessly.

In this case, that is, in the case where the electromagnetic transducer is used as an electromagnetic driver, the above-mentioned inconvenience when used as an electromagnetic pickup becomes a more remarkable problem. In other words, if the magnetic field becomes weak even a little, the excitation efficiency will also drop significantly.
When considering the choking and bending performances, a cylindrical pole piece in which the magnetic flux concentrates on the strings cannot be used, and it is necessary to pass a large current amplified by the amplifier, so the relative amount of magnetic flux radiation is driven by excitation. This is because it has a relationship that is extremely important and closely related to the energy conversion efficiency for. In addition to this, if the excitation balance of each string is not controlled, the volume balance of each string will be greatly different. That is, when the volume difference between the strings is used as an electromagnetic pickup, it can be covered to some extent by the strength of picking by the player himself, but in the case of self-excitation, the volume is a part where the player cannot participate. Because it will be decided by
It also had a drawback that there were strings with large vibrations and strings with small vibrations, which sometimes became uncomfortable. As for the first string (the thinnest string), which is the most important in terms of musical expression, it is located at the end of a plurality of strings as described above, that is, at a place where the amount of magnetic flux emission is particularly small, as shown in FIG. Furthermore, since each string is the thinnest, that is, the mass is small, electromagnetic excitation is difficult to occur, which is an extremely serious problem when an electromagnetic driver is used for such self-excitation.

Further, as described above, since the excitation balance of each string is poor, the weakest excited string, for example, the first string is excited.
When the magnetic energy output from the electromagnetic driver is combined with the strings, the strings are relatively easily excited, for example, the 5th and 6th strings are excessively output. It also had the inconvenience that the strings were excited by themselves. This inconvenience forces the player to always play while muting the strings, which is an extremely serious problem in the actual playing method.

[0011]

The present invention has the above-mentioned problems,
It is an improvement of the inconvenience that, in an electromagnetic transducer for an electric stringed instrument having a bar type pole piece, the amount of magnetic flux radiation relative to a string and / or the magnetic flux radiation balance corresponding to each string can be controlled and set in advance by an optimum configuration. It is an object of the present invention to provide an electromagnetic transducer for an electric stringed instrument that is made possible.

Further, the present invention aims at compensating the output of the first string especially when the electromagnetic transducer is used as an electromagnetic pickup, and particularly when the electromagnetic transducer is used as an electromagnetic driver, the excitation drive electromagnetic wave of the first string. It is an object of the present invention to provide an electromagnetic transducer for an electric stringed instrument that reinforces energy and compensates for a sound volume difference with respect to other strings, has an extremely good balance, and can be comfortably used.

Further, according to the present invention, when used as an electromagnetic driver, the excitation drive electromagnetic energy injected into each string can be set to an optimum balance, so that the difference between the string that is easily excited and the string that is difficult to be excited is averaged, That is, the unnecessary unnecessary excitation of the easily excited strings, which occurs when the output of the electromagnetic energy is matched to the difficult-to-excite strings, can be suppressed by reducing the entire driving electromagnetic energy, and therefore the mute for suppressing the unnecessary excitation. It is an object of the present invention to provide a transducer for an electric stringed instrument in which the number of operations is remarkably reduced, and also in this sense, it can be used extremely comfortably.

[0014]

According to the present invention, in an electromagnetic transducer for an electric stringed instrument having a bar type pole piece, the amount of magnetic flux radiation relative to the string and / or
Alternatively, the bar-type pole pieces are provided with magnetic flux radiating deflection means for controlling the magnetic flux radiating balance corresponding to each string. Further, according to the present invention, as the magnetic flux radiation deflecting means, a slit or a small hole forming a magnetic gap, a composite structure of a ferromagnetic material and a weak magnetic material, a sub-magnet, etc. are provided.

[0015]

The magnetic flux radiation deflecting means deflects useless magnetic flux radiation radiated in directions other than the chord direction of the electromagnetic transducer,
As a result, the amount of magnetic flux radiation in the chord direction is increased. And / or the flux radiating deflection means also functions as a balancer to properly distribute the amount of flux radiated from the electromagnetic transducer to each string.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an electromagnetic transducer for an electric stringed instrument of the present invention will be described in detail below with reference to FIG.
In the figure, 1 indicates an electromagnetic transducer. The electromagnetic transducer 1 in the present embodiment is basically a double coil type electromagnetic transducer 61 using the bar type pole piece shown in FIG.
The configuration is almost the same as. That is, 2 is a bar type pole piece. This bar type pole piece 2
Is made of a ferromagnetic material, and the lower part thereof is magnetically coupled to the magnet 3 shown by a broken line. 4 is a coil. This coil 4 is the bar type pole piece 2 described above.
Is wound around the. 5 is a bobbin 51, 51, ...
... is a string. In the vicinity of both edges of the bar type pole piece 2, magnetic flux radiating deflecting means, that is, magnetic flux increasing slits 6, 6 which are magnetic air gaps are provided. As shown in FIG. 12, the magnetic flux amount increasing slits 6 and 6 reduce the magnetic flux in the vicinity of both ends of the string whose density is thinned by being bent and radiated from both ends of the electromagnetic transducer.
It is provided in order to efficiently give a relative amount of magnetic flux radiation to the strings by directing the magnetic flux bending around to the direction of the strings by providing the magnetic resistance by the magnetic gap, that is, by deflecting the magnetic flux radiation in the string direction. There is. Further, the bar type pole piece 2 has the magnetic flux amount increasing slits 6 and 6.
Besides, radiation balance control slits 7, 7, ... Are provided. These radiation balance control slits 7, 7, ...
Also, the magnetic flux radiated by the magnet 3 is applied to the string 5 due to the magnetic air gap.
1, 51, ... are provided to radiate in a well-balanced manner. In this embodiment, in particular, the thinnest, in other words, the smallest mass and relatively high tension, that is, when used as a pickup, Since the detection output is the smallest and when used as a driver, the magnetic flux is concentrated on the first string (the string at the right end of the drawing) that is the most difficult to be excited, the area corresponding to this first string is reduced. Radiation balance control slits 7, 7, ... Are provided so as to spread downward so as to be larger than the areas of other portions.

Next, the operation of the above embodiment will be described. The magnetic flux of the magnet 3 is radiated to the strings 51, 51, ... Through the bar type pole piece 2, but since the magnetic flux increasing slits 6 and 6 serve as magnetic resistance, the magnetic radiation in the lateral direction of the drawing is obtained. Is suppressed and becomes a magnetic flux in the chord direction as shown by a broken line, and the magnetic flux corresponding to the surrounding is also deflected and concentrated in the chord direction, so that the relative magnetic flux amount also increases. Further, the radiation balance control slits 7, 7, ... Are also concentrated on an arbitrary string, in the present embodiment, the first string to radiate the magnetic flux of the magnet 3 in a concentrated manner, that is, corresponding to the output or excitation force for each string. It has the function of controlling the magnetic flux radiation balance.

Next, a second embodiment of the electromagnetic transducer for an electric stringed instrument of the present invention will be described in detail with reference to FIG. 2. The same parts as those of the first embodiment will be designated by the same reference numerals and will be described. Is omitted. The electromagnetic transducer 10 according to the present embodiment is basically the above-mentioned conventional example shown in FIG.
It has substantially the same configuration as the single type electromagnetic transducer 60 using the bar type pole piece shown in (a). That is, 11 indicates a bar type pole piece. The bar type pole piece 11 is formed of a magnet, and the coil 4 is wound around the magnet. Further, small holes 12, 12, ... For increasing the amount of magnetic flux are opened at both end portions of the bar type pole piece 11.
Further, the radiation balance control small holes 13, 13, ... Are formed in a position between the strings at the upper edge of the same.

Next, the operation of the above embodiment will be described. The magnetic flux amount increasing small holes 12, 12, ... In this embodiment have the same action as the magnetic flux amount increasing slits 6, 6 in the first embodiment, that is, the small holes serve as a magnetic resistance due to a magnetic gap. As a result, the magnetic flux that bends around the strings 51, 51, ...
It has the function of increasing the relative amount of magnetic flux while deflecting in the direction of. Further, the radiation balance control small holes 13, 13, ... In this embodiment have the same operation as the radiation balance control slits 7, 7 ,.
That is, by making the small holes have a magnetic resistance due to a magnetic gap, the magnetic flux is efficiently concentrated and radiated at the position where the string 51 exists.

Next, a third embodiment of the electromagnetic transducer for an electric stringed instrument of the present invention will be described in detail with reference to FIG. 3. The same parts as those of the first embodiment will be designated by the same reference numerals and will be described. Is omitted. In the figure, 15 indicates an electromagnetic transducer, and 16 indicates a bar type pole piece.
The bar type pole piece 16 is magnetically coupled to the magnet 3 and has a composite structure of two kinds of magnetic materials. That is, the parts corresponding to the strings 51, 51, ... Are made of iron, alnico, ferrite, etc., and the ferromagnetic parts 17, 17 ,. The weak magnetic material parts 18, 18, ... Made of brass or the like are formed.

Next, the operation of the above embodiment will be described. The magnet 3 gives a uniform magnetic flux to the bar type pole piece 16, but since the ferromagnetic material portion 17 and the weak magnetic material portion 18 have different magnetic permeability, the weak magnetic material portion 17 is different from the ferromagnetic material portion 17. Reference numeral 18 serves as a magnetic air gap to generate magnetic resistance. for that reason,
The magnetic flux radiated to the strings 51, 51, ...
It has the effect of being radiated by being deflected to the magnetic flux balance corresponding to 1, ....

Next, a fourth embodiment of the electromagnetic transducer for an electric stringed instrument of the present invention will be described in detail with reference to FIG. 4. The same parts as those of the first embodiment will be designated by the same reference numerals and will be described. Is omitted. In the figure, 20 indicates an electromagnetic transducer, and 21 indicates a bar type pole piece.
22 is a sub magnet. This sub magnet 22
Is arranged at the end of the bar type pole piece 21 on the first chord side so that its joint surface has the same polarity as the bar type pole piece 21.

Next, the operation of the above embodiment will be described. The bar type pole piece 21 is the conventional example shown in FIG.
Although the magnetic flux is radiated as shown in, since the sub magnets 22 are arranged with the same polarity at the end of the first chord side,
The magnetic flux that should be emitted by bending around is forcibly deflected in the string direction by the repulsion, and the amount of magnetic flux radiation relative to the strings 51, 51 ,.
It acts to compensate the detection output or excitation energy of the string.

Next, a fifth embodiment of the electromagnetic transducer for an electric stringed instrument of the present invention will be described in detail with reference to FIGS. In the figure, 30 indicates an electromagnetic transducer. The electromagnetic transducer 30 has three bar type pole pieces. Of these three bar type pole pieces, the bar type pole pieces 31 on both sides are
31 is formed in the shape of FIG. 7A, and the center bar type pole piece 32 is formed in the shape of FIG. 7B. 33, 33, 33, 33 are magnets. The magnets 33, 33, 33, 33 are arranged so as to be sandwiched between the central portions of the three bar-type pole pieces 31, 32, 31 and they are integrally fixed by a screw 34. Also, the magnets 33, 3
Coils 35 and 35 are wound around 3, 33 and 33. Bar type pole pieces 31, 31 on both sides
And the center bar type pole piece 32 is a string 51,
In order to optimally control the amount of magnetic flux radiation relative to 51, ... That is, the bar-type pole pieces 31, 3 on both sides shown in FIG.
1 has small holes 36, 36, ... For increasing the amount of magnetic flux and slits 37, 37 for increasing the amount of magnetic flux formed at both ends of the string 1.
A lower magnetic flux suppressing slit 38 is formed for suppressing magnetic flux radiation toward the lower side of the drawing, which is the opposite direction of the direction.
On the other hand, in the center bar type pole piece 32 shown in FIG. 2B, in addition to the magnetic gaps described above, a radiation balance control slit for optimizing the magnetic flux radiation balance for each string as shown in FIG. 39, 39, ... Are formed. Although the basic structure of the electromagnetic transducer is different from that of the first to fourth embodiments, the operation of the present embodiment is not limited to the above with respect to the control of the relative radiation amount of the magnetic flux and the magnetic flux radiation balance corresponding to each string. Since it is the same as the first and second embodiments, its explanation is omitted.

Next, a sixth embodiment of the electromagnetic transducer for an electric stringed instrument of the present invention will be described in detail with reference to FIGS. 8 and 9. The same parts as those of the fifth embodiment are designated by the same reference numerals. And its description is omitted. This embodiment shows a suitable example especially when the electromagnetic transducer is used as an electromagnetic driver. In the figure, reference numeral 40 denotes an electromagnetic driver which is an electromagnetic transducer. The electromagnetic driver 40 is mounted on a main body 42 of an electric guitar 41. Reference numeral 43 is an electromagnetic pickup. The output of the electromagnetic pickup 43 is input to the amplifier 44, and the output of the amplifier 44 is input to the electromagnetic driver 40. Reference numeral 45 is a tremolo device. One end of a string 51 is locked to the tremolo device 45, and the tremolo device 45 allows the tension of the string 51 to be arbitrarily changed to raise or lower the pitch.
It is mounted swingably on 2. 46 is a spring. This spring 46 is provided to return the tremolo device 45 to the position before use after use, one end of which is connected to the end of the tremolo device, and the other end of which is connected via a metal screw 47. It is joined to the guitar body 42. The electromagnetic driver 40 is basically constructed in the same manner as in the fifth embodiment, but the bar-type pole piece 48 is further provided with the downward deflection slit 4.
9,49 are added.

Next, the operation of the above embodiment will be described. The electromagnetic driver 40 radiates drive magnetic energy that excites the strings 51. This driving magnetic energy is transferred to the electromagnetic pickup 43.
The electric signal detected by (1) is amplified by the amplifier 44 and converted into magnetic energy by the electromagnetic driver 40. The driving magnetic energy is radiated not only in the chord direction but also in the surroundings including the lower portion of the electromagnetic driver 40. The radiated drive magnetic energy is efficiently controlled by the magnetic air gaps 36, 37, 38. As described above, the metallic spring 46 and the spring 46 of the metal 46 are provided below the guitar body 42. Since there is a metal screw 47 for fixing one end and a tremolo device 45 made of iron, each of these metal parts serves as a conductive magnetic path, and magnetic energy enters from the lower end of the electromagnetic pickup 43, resulting in a so-called magnetic feedback state. It will start. The downward deflection slit 4
Reference numerals 9 and 49 serve to suppress the generation of magnetic feedback by the metal parts by deflecting and dispersing the magnetic energy emitted by the electromagnetic driver 40 to the left and right.

In the description of the above embodiments, the electromagnetic transducer is described as a combination of the electromagnetic pickup and the electromagnetic driver. However, except for the sixth embodiment, basically, either the pickup or the driver is used. It may be applied to. Furthermore, as an example of the magnetic flux radiation deflecting means, an example in which a composite structure of a slit, a small hole, a weak magnetic material, which is a magnetic gap, and a submagnet are applied has been described, but the invention is not limited to this, and the magnetic flux Any structure and means may be applied as long as it is a means for deflecting radiation. Further, in the description of the first and second embodiments, both the magnetic air gap for increasing the relative amount of magnetic flux radiation and the magnetic air gap for controlling the magnetic radiation balance corresponding to each string are provided. Although an example has been described, it may be provided with only one of them as necessary. Further, the width, shape and design of the slit or the size and arrangement of the small holes in this embodiment are not limited to those in the embodiment, and may be appropriately changed according to the application, the output balance of each string and the like. good.

Furthermore, in the description of the third embodiment,
As an example of the magnetic gap, a composite structure with a weak magnetic material has been described, but in order to more positively deflect the magnetic flux, it has a composite structure with a non-magnetic material such as ceramics, plastics or aluminum. May be. Further, in the description of the fourth embodiment, an example in which the sub magnet for deflecting the magnetic flux is provided only at the end on the first string side has been described, but the opposite end, that is, the end on the sixth string side is described. It may also be arranged. Further, the present invention is only required to be an electromagnetic transducer having a bar type pole piece, and the application of the present invention may be applied to either a single coil type or a double coil type electromagnetic transducer. The type pole piece itself may be formed of a magnet, or the bar type pole piece may be formed of a magnetic material and magnetically coupled to the magnet.

[0029]

As is apparent from the above description, according to the electromagnetic transducer for an electric stringed instrument of the present invention, in the electromagnetic transducer having the bar type pole piece,
Conventionally, it becomes possible to suppress the magnetic flux radiated to an unnecessary portion for detecting or exciting the string vibration and to deflect the magnetic flux in the direction of the string, and / or to provide the optimum magnetic flux for each string. Since it is possible to deflect the magnetic flux in order to eliminate the volume difference and excitation difference for each string by setting, it is possible to increase the relative amount of magnetic flux radiation and / or to set the optimum magnetic flux radiation balance corresponding to each string. It has a remarkable effect.

In addition, when the electromagnetic transducer is used as an electromagnetic pickup, the detection signal is particularly weak when the relative magnetic flux amount is increased or particularly the magnetic flux distribution for the first string is increased. It has the effect of compensating the output of the strings and providing an electromagnetic pickup that is extremely well balanced and can be used comfortably, and when used as an electromagnetic driver, it reinforces the drive of the first string, which is difficult to excite. It has the effect of keeping the vibration of the strings evenly balanced.

Further, as described above, when it is used as an electromagnetic driver, it is possible to reinforce the drive of a string that is hard to be excited, so that a relatively excessive drive electromagnetic force is conventionally used to drive the string that is hard to be excited. It is possible to significantly reduce the generation of unintended and unnecessary unnecessary excitation of the easily excited strings caused by the injection of energy, and it is possible to achieve a remarkable effect on the playing operation that requires less mute operation. .. In addition, the similar effect makes it possible to reduce the relative driving electromagnetic energy, so that it also has the effect of reducing power consumption. This effect takes into consideration the form in which the battery is built into the guitar body. In this case, it can be extremely effective.

Further, when the magnetic air gap is slit and the area corresponding to the first string is increased as in the first embodiment, the electromagnetic conversion efficiency is also related to the area of the bar type pole piece in contact with the coil. Therefore, not only the amount of magnetic radiation but also this aspect has a synergistic effect of favorably compensating for the output or exciting force of the first string. Also, since the area in contact with the coil is relatively reduced by the slit,
It also acts to reduce the inductive inductance. for that reason,
When it is used as an electromagnetic pickup, it also has the effect of increasing the resonance frequency and improving the high frequency characteristics.

Further, as in the fifth embodiment, when a magnet is arranged at the center of the electromagnetic transducer and a magnetic gap is further added below the magnet, the magnetic flux radiated downward is also suppressed. Since the magnetic flux is deflected in the chord direction, the magnetic flux radiated in the chord direction also has the effect of being relatively increased. Further, when used as an electromagnetic driver as in the sixth embodiment, if a downward deflection slit is further added, the tremolo device, the spring, the metal screw, etc. become a magnetic path and enter the electromagnetic pickup from above. The magnetic drive energy that enters from below is larger than the magnetic drive energy that is generated, that is, a difference is generated, so that so-called magnetic feedback in which high frequency noise is generated is less likely to occur.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of an electromagnetic transducer according to the present invention.

FIG. 2 is a diagram showing a second embodiment of the electromagnetic transducer according to the present invention.

FIG. 3 is a diagram showing a third embodiment of the electromagnetic transducer according to the present invention.

FIG. 4 is a diagram showing a fourth embodiment of the electromagnetic transducer according to the present invention.

FIG. 5 is a diagram showing a fifth embodiment of the electromagnetic transducer according to the present invention.

6 is a cross-sectional view of the electromagnetic transducer of FIG. 5 taken along the line AA in the figure.

7A is a view showing bar type pole pieces on both sides, and FIG. 7B is a view showing center bar type pole pieces.

FIG. 8 is a diagram schematically showing the structure of an electric guitar to which an electromagnetic transducer of a sixth embodiment according to the present invention is attached.

FIG. 9 is a diagram showing a sixth embodiment of the electromagnetic transducer according to the present invention.

10A and 10B are diagrams showing an electromagnetic pickup using a conventional cylindrical pole piece, FIG. 10A shows a single coil type electromagnetic pickup, and FIG. 10B shows a double coil type electromagnetic pickup.

11A and 11B are views showing an electromagnetic pickup using a conventional bar type pole piece. FIG. 11A shows a single coil type electromagnetic pickup, and FIG. 11B shows a double coil type electromagnetic pickup.

FIG. 12 is a diagram schematically illustrating a magnetic field of magnetic flux emitted from an electromagnetic pickup using a conventional bar type pole piece.

[Explanation of symbols]

1, 10, 15, 20, 30, 40 ... Electromagnetic transducer 2, 11, 16, 21, 31, 32, 48, 62, 64
... Bar type pole piece 3,33,55,63 ... Magnet 4,35,53 ... Coil 5,58 ... Bobbin 6,37 ... Magnetic flux increasing slit 7,39 ... Radiation balance control slit 12,36 ... Magnetic flux increasing small hole 13 ... Radiation balance control small hole 17 ... Ferromagnetic material part 18 ... Weak magnetic material part 22 ... Sub magnet 34 ... Screw 38 ... Lower magnetic flux control slit 40 ... Electromagnetic driver 41 ... Electric guitar 42 ... Main body 43 ... Electromagnetic pickup 44 ... Amplifier 45 ... Tremolo device 46 ... Spring 47 ... Metal screw 49 ... Downward deflection slit 50, 60 ... Single coil type electromagnetic pickup 51 ... Strings 52, 56, 57 ... Cylindrical pole piece 54, 61 ... Double coil type electromagnetic pickup 59 ... cover

Claims (12)

[Claims] 1. An electromagnetic transducer for an electric stringed instrument having a bar-type pole piece, wherein the bar-type pole piece has magnetic flux radiation for controlling the amount of magnetic flux radiation relative to the string and / or the magnetic flux radiation balance corresponding to each string. An electromagnetic transducer for an electric stringed instrument, comprising a deflection means. 2. The electromagnetic transducer for an electric stringed instrument according to claim 1, wherein the magnetic flux radiation deflection means is a magnetic air gap formed in a bar type pole piece. 3. The electromagnetic transducer for an electric stringed instrument according to claim 2, wherein the magnetic gap is a slit. 4. The electromagnetic transducer for an electric stringed instrument according to claim 2, wherein the magnetic gap is a small hole. 5. The electromagnetic transducer for an electric stringed instrument according to claim 2, wherein the magnetic gap is made of a non-magnetic material or a weak magnetic material. 6. The electromagnetic transducer for an electric stringed instrument according to claim 1, wherein an upper edge of the bar-type pole piece is substantially linear. 7. The bar-type pole piece is a plate-shaped body formed of a permanent magnet.
7. An electromagnetic transducer for an electric stringed instrument according to any one of items 6 to 6. 8. The bar-type pole piece is a plate-shaped body made of a magnetic material, and a permanent magnet is magnetically coupled to the plate-shaped body. An electromagnetic transducer for an electric stringed instrument according to any one of the above. 9. The electromagnetic transducer for an electric stringed instrument according to claim 1, wherein the electromagnetic transducer is an electromagnetic pickup that detects string vibration. 10. The electromagnetic transducer for an electric stringed instrument according to claim 1, wherein the electromagnetic transducer is an electromagnetic driver that radiates magnetic energy for driving the strings to be excited. 11. The magnetic flux radiation deflecting means is a sub-magnet which is appropriately arranged so as to face the same polar surface as the magnetic flux emitted by the bar type pole piece so as to face each other. An electromagnetic transducer for an electric stringed instrument according to any one of the above. 12. The electromagnetic transducer for an electric stringed instrument according to claim 11, wherein the sub-magnet is arranged at least near the first chord side of the bar type pole piece.