JP3239206U - A magnetic pickup and an attachment part that can be attached to the upper part of the magnetic pickup. - Google Patents

Abstract

To provide a magnetic pickup and an attachment part that can be attached to the upper part of the magnetic pickup, the output of which can be easily changed without requiring modification of the stringed instrument body and the magnetic pickup. In a magnetic pickup of the present disclosure, at least one of a sintered magnet and a cast magnet having the same magnetic pole orientation as a pole piece of the magnetic pickup and having higher coercive force than the pole piece is mounted on the pole piece. The plurality of sintered magnets and cast magnets provided for each pole piece are anisotropic magnets with a thickness of 1 mm or more and 2.5 mm or less and a size that does not contact the string. . [Selection drawing] Fig. 1

Description

The present disclosure relates to a magnetic pickup and an attachment component attachable to the upper portion of the magnetic pickup.

Stringed instruments (guitars, etc.) are widely used as musical instruments, and are enjoyed by individuals and for entertainment by a large number of people. The body of a stringed instrument is mainly made of wood, but it is also made of various materials such as carbon and resin. A plurality of strings are arranged in the stringed instrument body, and by vibrating the stringed instrument strings (hereinafter simply referred to as strings), the strings and the stringed instrument body resonate and output as sound to the outside. In order to amplify the generated sound, there is a stringed instrument that has a box-shaped main body and utilizes the vibration of the air inside the box in addition to the vibration of the main body. In addition, the main body is equipped with an amplifier called a magnetic pickup, which uses pole pieces and conductive wires that contain magnetic substances such as iron, nickel, and cobalt, or magnets, and the principle of electromagnetic induction between the vibration of the strings and the magnetic pickup. There is also a stringed instrument that outputs a large volume of the output electric signal through an output device called an amplifier, and is generally called an electric guitar.

A magnetic pickup generates an electrical signal through electromagnetic induction, so the electrical signal changes depending on the type and size of the magnet and pole piece used, and the type, size and number of turns of the conductor wire. In order to generate an output that satisfies the user's tastes and preferences, a plurality of companies have commercialized a plurality of types.

Since a magnetic pickup generates an electric signal based on the principle of electromagnetic induction, the closer the distance between the pole piece and the string of the stringed instrument, the greater the electric signal generated. However, if it is too close, the magnetic attractive force will suppress the vibration of the string, so it is desirable to set the distance to be appropriate.

A magnetic pickup is fixed to a stringed instrument body using screws, connectors, or the like, and is electrically wired using solder, connectors, or the like. In the case of general stringed instruments, they are fixed to the main body with screws and wired by soldering, and many of them have a structure that makes it difficult to remove and attach them.

In general, most magnetic pickups are equipped with a volume adjustment mechanism called a volume control and a tone control mechanism called a tone control, which are soldered resistors and capacitors. Therefore, when a user of a stringed instrument wants to change the output, replacing the magnetic pickup requires removal and attachment of solder and removal and attachment of resistors and capacitors, making it difficult to replace easily. Furthermore, there are many obstacles to improving the output by replacing the magnetic pickup because the magnetic pickup body may be damaged during the removal and installation of the magnetic pickup, and the output may not be as desired after replacement.

Patent Document 1 proposes an electric guitar in which a magnetic pickup is arranged in a detachable pickguard, and the entire guitar can be freely replaced.

Patent Document 2 proposes a signal conversion device using a thin flexible permanent magnet sheet.

JP 2009-222843 A JP-A-7-72870

According to the method described in Patent Document 1, if a plurality of pickguards with detachable magnetic pickups are prepared, the output can be changed by exchanging the pickguards. However, it requires a dedicated stringed instrument body to which a pickguard with a magnetic pickup can be attached. The sound produced by a stringed instrument does not depend only on the magnetic pickup, but is greatly affected by the material and acoustic performance of the stringed instrument body, so the combination of the stringed instrument body and the magnetic pickup affects the output such as tone color and volume. Therefore, in this dedicated stringed instrument, although the type of magnetic pickup can be changed, the body of the stringed instrument, which greatly affects the acoustic performance, is dedicated, so the elements that depend on the body are fixed. Furthermore, a pickguard with a magnetic pickup is expected to be priced accordingly, and the overall cost increases, making it impractical.

In addition, in the method described in Patent Document 2, the thin and flexible permanent magnet sheet contains a small amount of magnetic material components, and the generated magnetic force is small, so sufficient magnetic correction is difficult. Output may not be improved.

The present disclosure provides a magnetic pickup capable of easily changing an output without requiring modification of a stringed instrument body and a magnetic pickup, and an attachment part attachable to the upper portion of the magnetic pickup.

In the magnetic pickup of the present disclosure, at least one of a sintered magnet and a cast magnet having the same magnetic pole orientation as the pole piece of the magnetic pickup and having a higher coercive force than the pole piece is arranged on the pole piece. The plurality of sintered magnets and cast magnets provided for each pole piece are anisotropic magnets having a thickness of 1 mm or more and 2.5 mm or less and having a size that does not come into contact with the string. In one embodiment, the thickness is 1 mm or more and 2.0 mm or less.

In the attachment part of the present disclosure, the plurality of sintered magnets and cast magnets provided for each pole piece are anisotropic magnets, have a thickness of 1 mm or more and 2.5 mm or less, and have a size that does not contact the string. , at least one of the sintered magnet and the cast magnet, and an attachment member for fixing at least one of the sintered magnet and the cast magnet, and converting the vibration of the stretched string into an electric signal. It can be attached to the upper part of the magnetic pickup for conversion. In one embodiment, the thickness is 1 mm or more and 2.0 mm or less.

According to the present disclosure, it is possible to provide a magnetic pickup that can easily change the output without modifying the stringed instrument main body and the magnetic pickup, and an attachment part that can be attached to the upper part of the magnetic pickup.

FIG. 1 is a cross-sectional view showing an embodiment of the present disclosure in which a detachable magnet is attached to the upper portion of a general magnetic pickup. FIG. 2 is a cross-sectional view showing an attachment component of the present disclosure having a magnet and an attachment member for securing the magnet; FIG. 3 is an explanatory diagram showing changes in output sound volume according to the embodiment. FIG. 4 is an explanatory view showing a state in which a non-magnetized iron member is brought into contact with the pole piece several times. FIG. 5 is an explanatory view showing a state in which a non-magnetized iron member is brought into contact with the top of the magnet several times. FIG. 6 is an explanatory diagram showing a state in which the magnet is brought into contact with the pole piece in the opposite magnetic pole direction. FIG. 7 is an explanatory diagram showing a state in which the magnet is brought into contact with the pole piece in the same magnetic pole direction.

A magnetic pickup generates an electrical signal based on the principle of electromagnetic induction. Therefore, the closer the pole piece is to the string of the stringed instrument, the greater the electrical signal generated, and the greater the output. be. Therefore, it is desirable to set an appropriate distance, but the strings of stringed instruments come in a variety of materials and thicknesses, and depending on the type of string used, the strength of the signal generated from each string varies, resulting in a balanced output. can get worse. A magnetic pickup that converts the vibration of a strung string into an electrical signal is generally accompanied by a mechanism that raises and lowers the overall height, but it only adjusts the overall height. For example, when it is desired to increase the generated signal only at the central portion or only at the ends, it is impossible to raise or lower the height of the pole piece only partially.

The stringed instrument of the present disclosure does not require modifications to the stringed instrument body as well as the magnetic pickup body. At least one of a detachable sintered magnet and a cast magnet is provided on the upper portion of the magnetic pickup for a stringed instrument for which an improvement in output is desired. At least one of a sintered magnet and a cast magnet having the same magnetic pole orientation as the pole piece of the magnetic pickup and having a higher coercive force than the pole piece is placed on the pole piece. The plurality of sintered magnets and cast magnets provided for each pole piece are anisotropic magnets having a thickness of 1 mm or more and 2.5 mm or less and having a size that does not come into contact with the string. By adopting such a configuration, it becomes possible to easily change the output electric signal due to electromagnetic induction with the magnetic strings vibrating above the magnetic pickup, and it is possible to change the output emitted from the amplifier or the like. can. This makes it possible to easily change the output without modifying the stringed instrument body and the magnetic pickup. Furthermore, in the case of magnets called rubber magnets or plastic magnets, in which magnetic substances are mixed with resin or rubber, it was found that the improvement was only slight because the content of magnetic substances was low. Therefore, sintered magnets or cast magnets are suitable.
Furthermore, it was found that the magnetic field line distribution in the pole piece can be more effectively improved by using an anisotropic magnet as the form of the magnet. The anisotropic direction (orientation direction) of the anisotropic magnet is the direction in which the strings and the pickup face each other.

A specific description will be given below. FIG. 1 is a cross-sectional view showing an embodiment of the present disclosure in which detachable magnets are attached to the upper portion (the surface facing the strings) of a general magnetic pickup. As shown in FIG. 1, the stringed instrument of the present disclosure includes one or more magnets c, which are at least one of a sintered magnet and a cast magnet, which can be attached to and detached from the upper part of a general magnetic pickup A including a pole piece a and a conducting wire b. I have. In FIG. 1, there are six pole pieces a, but there are magnetic pickups with one plate-like pole piece and other forms, and the magnetic pickup structure to be applied is not limited to that shown in FIG. In FIG. 1, the detachable magnets c having the same dimensions as the pole pieces are arranged in the same number as the pole pieces. However, the magnet c may be larger or smaller than the pole piece, and the number and size of the magnets to be arranged are not limited to those shown in FIG. The magnet c in FIG. 1 is a cylindrical magnet with an outer diameter of Φ1 to Φ10, for example. The shape of the magnet c is not limited to a cylindrical shape, and may be rectangular, for example. In addition, the present disclosure sets the thickness of the magnet c to a range of 1.0 mm or more and 2.5 mm or less. Note that the thickness of the magnet in the present disclosure is the dimension in the anisotropic direction (orientation direction) of the magnet, and is the dimension of the magnet in the direction in which the string and the pickup face each other. The thickness of the magnet is also related to the distance between the string and the magnet, so it has a particular effect on the change in output. If the thickness of the magnet is too thin, the effect of changing the output may not be obtained. Strings may be attracted to magnets, making it difficult to play stringed instruments. By setting the thickness of the magnet c within the range of 1.0 mm or more and 2.5 mm or less, it is possible to reliably and easily change the output while suppressing the vibration of the strings. The thickness of the magnet c is preferably 1.0 mm or more and 2.0 mm or less.
FIG. 2 is a cross-sectional view showing an attachment component of the present disclosure having a magnet and an attachment member for securing the magnet; As shown in FIG. 2, in the stringed instrument of the present disclosure, the magnet c is attached to the magnetic pickup via an attachment member in order to facilitate handling of the magnet c that can be attached to and detached from the upper portion of the magnetic pickup A. (Attachment part d). That is, the attachment part d has at least one of a sintered magnet and a cast magnet, and an attachment member for fixing at least one of the sintered magnet and the cast magnet, and is mounted above the magnetic pickup A. Wearable. As in FIG. 1, the structure of the magnetic pickup and the number and size of detachable magnets are not limited to those in FIG. As shown in FIG. 2, when an attachment component having an attachment member is used to handle the magnets simultaneously, it is easy to dispose a plurality of magnets and to handle them quickly. Here, the attachment member is a member to which at least one of a sintered magnet and a cast magnet can be fixed. The attachment member may be made of any non-magnetic material such as resin, pulp, plastic or rubber. The attachment member can have a space for arranging a plurality of magnets. An integral structure in which the magnet of the present disclosure is attached to the main body is called an attachment part. Any method such as embedding or adhesion may be used as a method of attaching the magnet. Moreover, even if the number of magnets to be arranged is one, for example, an attachment part may be employed. This is because the external appearance is also an important factor. In this case, a dummy made of a non-magnetic material having the same shape may be arranged at the position for arranging the magnet.

The magnet c of the present disclosure may be any of sintered magnets such as neodymium magnets, samarium cobalt magnets, ferrite magnets and alnico magnets as well as cast magnets such as alnico magnets and iron chromium cobalt magnets. Since sintered magnets may occasionally chip or crack depending on how they are handled, cast magnets are preferable from the viewpoint of strength. Furthermore, when compared among cast magnets, iron-chromium-cobalt magnets are more preferable because they are more resistant to chipping. At least one of the sintered magnet and the cast magnet is an anisotropic magnet. By using an anisotropic magnet, it is possible to more effectively improve the distribution of magnetic lines of force in the pole piece. This is because by using an anisotropic magnet, the direction of the magnetic force lines in the pole piece and the magnetic force lines of the magnet c of the present disclosure are in the same direction, so that the entire magnetic force lines are integrated, and it is difficult to leak to the outside. It is thought that it is because In addition, the magnet c may be provided with coating such as plating or resin coating in consideration of corrosion resistance and design. Also, the magnet of the present disclosure may have any shape or size, but it is preferable to set the shape and size so that the magnet does not come into contact with the strings when placed on the magnetic pickup.

In one embodiment, a magnet smaller or larger than the pole piece (at least one of a sintered magnet and a cast magnet) or an attachment part including the magnet is placed directly above the magnet or magnetic material portion called the pole piece of the magnetic pickup. Install. When it is used as an attachment part, a mechanism for physically fixing it to the pickup body may be provided, or it may be fixed only by the magnetic attraction force between the pole piece of the magnetic pickup and the magnet included in the attachment.

In one embodiment, a magnet (at least one of a sintered magnet and a cast magnet) or an attachment part including the magnet is attached to only a portion of the pole piece of the magnetic pickup. Conventionally, in order to adjust the output of only a part of the pole piece, it is necessary to raise or lower the height of a part of the pole piece, so it is necessary to attach and remove the magnetic pickup, which is troublesome, so it is easy to change. However, in the present disclosure, by providing the magnet of the present disclosure above the pole piece at an arbitrary position, it is possible to increase or decrease the strength of the generated signal at an arbitrary portion, and the output can be easily adjusted. can.

In one embodiment, a rectangular magnet (at least one of a sintered magnet and a cast magnet) or an attachment part including the magnet is attached to a part or the whole of the pole piece of the magnetic pickup, instead of a cylindrical magnet. Also, by covering the upper part of the pole piece of the magnetic pickup with a rectangular magnet or an attachment component containing a magnet, it is possible to change the generated signal and change the output.

In one embodiment, at least one of the sintered magnet and the cast magnet has the same magnetic pole orientation as the pole piece of the magnetic pickup and has a higher coercive force than the pole piece. Strings are replaced periodically or irregularly due to corrosion, aging and other conditions. When removing or attaching strings, the strings may come into contact with the pole piece. Stringed instruments also have many parts that are fixed using wood screws or the like. A screwdriver tool or the like is used to tighten loose screws or to replace parts. In some cases, the terminal (tester terminal) of a current/voltage/resistance measuring instrument (commonly called a tester) is brought into contact with the pole piece to check the polarity of the pole piece. Therefore, it is conceivable that a magnetic body (string, driver tool, tester terminal, etc.) may come into contact with the pole piece. Contact between these magnetic bodies may cause demagnetization in the pole piece.
Also, since the pole piece using an alnico magnet, for example, has a low coercive force, demagnetization progresses naturally, albeit gradually. For this reason, magnetic pickups sold as replacements may experience demagnetization in the pole pieces when stored for a long period of time during distribution or other stages.

As described above, demagnetization of the pole piece may occur unavoidably or accidentally due to various reasons such as contact of magnetic bodies and natural demagnetization. When the pole pieces are demagnetized, the amount of magnetic flux varies from pole piece to pole piece, and extreme demagnetization greatly affects the performance of stringed instruments, such as a decrease in sound volume.
In order to solve such problems, at least one of the detachable sintered magnet and the cast magnet placed on the upper part of the magnetic pickup (on the pole piece of the magnetic pickup) has the same magnetic pole as the pole piece of the magnetic pickup. It preferably has an orientation and a higher coercive force than the pole piece. Here, the same magnetic pole orientation means the magnetic pole orientation that is the same in the direction in which at least one of the magnetized sintered magnet and the cast magnet is attached to the magnetic pickup (one N pole is aligned with the other S pole). ). This can prevent a magnetic body such as a string or a driver tool from directly contacting a pole piece with a low coercive force. At least one of the sintered magnet and the cast magnet having the same magnetic pole orientation as that of the pole piece and having a higher coercive force than the pole piece is mounted on the pole piece when the stringed instrument or the magnetic pickup unit is shipped. As a result, the magnetic force at the time of manufacture can be maintained even if it is stored for several months or years. Further, as shown in Examples described later, at least one of a sintered magnet and a cast magnet having the same magnetic pole orientation as the pole piece with respect to the once demagnetized pole piece and a higher coercive force than the pole piece can be re-magnetized by placing on the pole piece, and the magnetic force can be restored by retracting at least one of the placed sintered magnet and the cast magnet from the pole piece (magnetic pickup demagnetization recovery method of the pole piece). Instead of the magnet, an attachment component including the above-described attachment member and the magnet may be attached on the pole piece. In general, alnico magnets used for pole pieces have a coercive force of about 50 to 150 kA/m, ferrite magnets have a coercive force of 200 to 500 KA/m or more, and neodymium magnets have a coercive force of 800 KA/m. m or more.

The present disclosure will be described in more detail by examples, but the disclosure is not limited thereto.

Example 1
BACCHUS BTE-1M model (electric guitar) was used as a stringed instrument, Roland Micro Cube GX was used as an amplifier, and the output volume was measured using Sound Level Analyzer LITE 5.1 software at a position 30 mm from the speaker of the amplifier. did. In addition, the surface magnetic flux of the magnet was measured using a Tesla meter Model 5070 manufactured by FW Bell and a probe STH57-0404 manufactured by FW Bell. The magnets used are sintered cylindrical (disk-shaped) neodymium magnets (dimensions (unit: mm) φ8×1, φ8×2, φ6×1, φ6×2, φ3×1, φ3×2). , samarium-cobalt magnets (φ6×1, φ6×2) and ferrite magnets (φ5×1, φ5×2) were used, and iron-chromium-cobalt magnets (φ5.4×2) were used as cast magnets. Rubber magnets (5×5×1, 5×5×2) were used as comparative examples. Anisotropic magnets were used instead of rubber magnets (isotropic). Table 1 and FIG. 3 show the results of the output volume and surface magnetic flux of the comparative example and the example.

As shown in Table 1 and FIG. 3, as a comparative example, the output sound volume without the magnet attached was 77.24 dB. Similarly, in the case of a rubber magnet measured as a comparative example, it was 77.76 to 77.84 dB, and the output volume was slightly improved by about 5 to 6%. On the other hand, when a neodymium magnet was arranged as an example, the output sound volume increased to 78.86 to 79.66 dB by 20 to 32%. Next, when the samarium-cobalt magnet was placed, the output sound volume increased to 78.70-79.68 dB, which was 18-33%. Next, when a ferrite magnet was arranged, the output sound volume increased to 78.72 to 79.40 dB, which was 18 to 28%. Next, when iron-chromium-cobalt magnets were arranged, the output sound volume increased to 79.88 dB, which was 36%. A large increase in output volume is confirmed in all examples, and compared to the slight improvement of 5-6% for the rubber magnet, the example has a clear difference in the amount of improvement in output volume of 18-36%, which is sufficient. effect was seen.

Example 2
A Fender Original Vintage Telecaster Pickup 1952 model was used as the pickup for the electric guitar. A Tesla meter Model 5070 manufactured by FW Bell and a probe STH57-0404 manufactured by FW Bell were used to measure the surface magnetic flux of the pole piece. The hole piece is an alnico magnet. A ferrite magnet (anisotropic magnet) having a coercive force higher than that of an alnico magnet was used as a magnet to be attached on the pole piece. If the effect of suppressing demagnetization can be obtained with ferrite magnets, it is clear that samarium-cobalt magnets and neodymium magnets, which have even higher coercive force, will exhibit the effect. In addition, ferrite magnets are industrially desirable because they are cheaper than samarium-cobalt magnets and neodymium magnets. The ferrite magnet used in the test had an outer diameter of Φ5 mm and a thickness of 1 mm.

First, when the surface magnetic flux of the pole piece magnet in the initial state was measured, it was 56.6 mT. In this state, as shown in FIG. 4, a non-magnetized iron member e was brought into contact with the pole piece several times as Test 1, and then the surface magnetic flux was measured and decreased to 51.2 mT. The rate of decrease is about 9.4%, which clearly indicates demagnetization. Next, a ferrite magnet having an outer diameter of Φ5 mm and a thickness of 1 mm was mounted on the pole piece in the same magnetic pole direction as the pole piece, and the surface magnetic flux was measured to be 127.9 mT. Attaching a ferrite magnet improved the surface magnetic flux. Next, in test 2, as shown in FIG. 5, a non-magnetized iron member e was brought into contact with the upper part of the ferrite magnet several times, and then the surface magnetic flux was measured and found to be 126.9 mT. Therefore, the rate of decrease was 1% or less, indicating that demagnetization was suppressed.

Next, as test 3, a neodymium magnet was placed on the pole piece as shown in FIG. When the surface magnetic flux was measured after contacting the pole piece, the display became negative and became -43.5 mT. In other words, the magnetic poles are completely reversed. As shown in FIG. 7, a neodymium magnet was placed on the pole piece in the same magnetic pole direction as the pole piece for the pole piece in which the magnetic poles were completely reversed in Test 3 (in FIG. and the north pole of the pole piece a is also in the upward direction). When the surface magnetic flux of the pole piece was measured, it changed to a positive display, and the magnetic pole was reversed again to 56.2 mT (Test 4). In other words, it was possible to restore the magnetic pole even with the pole piece that had completely reversed the magnetic pole.

A: Magnetic pickup, a: Pole piece, b: Lead wire (coil), c: Magnet (at least one of sintered magnet and cast magnet), d: Attachment part, e:・Steel parts

Claims (4)

At least one of a sintered magnet and a cast magnet having the same magnetic pole orientation as the pole piece of the magnetic pickup and having a higher coercive force than the pole piece is arranged on the pole piece,
The plurality of sintered magnets and cast magnets provided for each pole piece are anisotropic magnets with a thickness of 1 mm or more and 2.5 mm or less and a size that does not contact the string.
magnetic pickup. 2. The magnetic pickup according to claim 1, wherein said thickness is 1 mm or more and 2 mm or less. The plurality of sintered magnets and cast magnets provided for each pole piece are anisotropic magnets with a thickness of 1 mm or more and 2.5 mm or less and a size that does not contact the string,
It has at least one of the sintered magnet and the cast magnet, and an attachment member for fixing at least one of the sintered magnet and the cast magnet, and converts the vibration of the stretched string into an electric signal. An attachment part that can be attached to the upper part of the magnetic pickup for 4. The attachment part according to claim 3, wherein said thickness is 1 mm or more and 2 mm or less.

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