Pickup for stringed instrument and guitar

Abstract

A pickup (10) is provided with: a substrate (3); a first bobbin (21A) and a second bobbin (21B) arranged in parallel on a first surface of the substrate (3); a first magnetic pole piece (5A) inserted into the first bobbin (21A) and penetrating the substrate (3); a second magnetic pole piece (5B) inserted into the second bobbin (21B) and penetrating the substrate (3); and a magnet (4) that is disposed on a second surface of the substrate (3), said second surface being on the opposite side from the first surface, and that is in contact with the first magnetic pole piece (5A) and the second magnetic pole piece (5B).

Description

Technical Field

[0001] The present invention relates to a pickup for a stringed instrument and a guitar having the pickup. Background Art

[0002] An electric guitar is equipped with a pickup that converts string vibration into an electrical signal. Generally, a pickup has a substrate, a coil, a magnet, and a pole piece. The pole piece is arranged so as to pass through the inside of the coil frame and contact the magnet.

[0003] Patent Document 1 below discloses a pickup in which a magnet is arranged on a metal substrate, and a coil bobbin is further arranged on the magnet.

[0004] Patent Document 2 below discloses a pickup using a printed circuit board as a substrate. A magnet and a positioning frame are arranged on the substrate. A coil frame is further arranged on the magnet and the positioning frame.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: U.S. Patent Publication No. 9,552,802

[0008] Patent Document 2: U.S. Patent Publication No. 9,355,630 Summary of the invention

[0009] Technical problem to be solved by the invention

[0010] For a pickup using a metal substrate, the mounting accuracy may be reduced due to the plastic deformation of the metal. Specifically, the planarity of the metal substrate cannot be ensured, and the mounting accuracy of each component arranged on the metal substrate is reduced. If the mounting accuracy is reduced, the contact accuracy between the magnet and the pole piece may be reduced, resulting in an increase in magnetic resistance. The increase in magnetic resistance is the cause of the reduction in the gain of the pickup.

[0011] Furthermore, the pickup having a structure in which a magnet is disposed between the substrate and the coil has the problem of complicated installation. Furthermore, since the coil frame is disposed on the magnet and the positioning frame, it is difficult to keep the coil frame horizontal, which also reduces the installation accuracy of the pickup.

[0012] An object of the present invention is to maintain the mounting accuracy of a pickup at a high level.

[0013] Technical solutions for solving technical problems

[0014] A string instrument pickup according to one aspect of the present invention comprises: a substrate; a first bobbin and a second bobbin, which are arranged side by side on a first surface of the substrate; a first pole piece, which is inserted into the first bobbin and passes through the substrate; a second pole piece, which is inserted into the second bobbin and passes through the substrate; and a magnet, which is arranged on a second surface of the substrate opposite to the first surface and contacts the first pole piece and the second pole piece.

[0015] A guitar according to another aspect of the present invention includes the above-mentioned string instrument pickup.

[0016] Effects of the Invention

[0017] According to the present invention, the mounting accuracy of the pickup can be maintained at a high level. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an exploded view of the pickup according to the first embodiment.

[0019] Figure 2 It is a side view of the pickup according to the first embodiment.

[0020] Figure 3 It is a side sectional view of the pickup according to the first embodiment.

[0021] Figure 4 is a top view of the substrate.

[0022] Figure 5 This is a diagram showing eddy currents generated on a substrate.

[0023] Figure 6 It is an exploded view of the pickup according to the second embodiment.

[0024] Figure 7 It is a side view of the pickup according to the second embodiment.

[0025] Figure 8 This is an exploded view of a pickup according to a modified example. DETAILED DESCRIPTION

[0026] [1] First Embodiment

[0027] {1. The overall structure of the pickup}

[0028] Figure 1 1 is an exploded view showing the pickup 10 of the first embodiment. In the following description, the X direction of each drawing is regarded as the upper side of the pickup 10, the Y direction is regarded as the front side of the pickup, and the Z direction is regarded as the right side of the pickup 10. Figure 2 1 is a side view showing the pickup 10 . Figure 3 is a side sectional view showing the pickup 10. Figure 1As shown in FIG. 1 , the pickup 10 includes a coil 2, a substrate 3, a magnet 4, a magnetic pole piece 5A (magnetic core), and a magnetic pole piece 5B (screw). Figure 2 and Figure 3 The base is fixed by screws 6A and 6B. The pickup 10 is installed in a stringed instrument. For example, the pickup 10 is installed in an electric guitar to convert the vibration of the string into an electrical signal.

[0029] {2. Coil structure}

[0030] like Figure 1 to Figure 3 As shown, the coil 2 includes a coil 2A and a coil 2B. The coils 2A and 2B include winding frames 21A and 21B, respectively. Coil conductors 22A and 22B are wound around the winding frames 21A and 21B, respectively. In this embodiment, the winding frame 21A is an example of a first winding frame of the present invention, and the winding frame 21B is an example of a second winding frame of the present invention.

[0031] like Figure 1 As shown in FIG. 1 , six holes 23A are provided at equal intervals in the winding frame 21A. The holes 23A are holes that penetrate the winding frame 21A in the vertical direction. The magnetic pole piece 5A is inserted into each hole 23A. Figure 1 As shown, six holes 23B are provided at equal intervals in the winding frame 21B. The holes 23B are holes that penetrate the winding frame 21B in the vertical direction. The pole pieces 5B are inserted into each hole 23B. In this embodiment, the pole piece 5A is an example of the first pole piece of the present invention, and the pole piece 5B is an example of the second pole piece of the present invention.

[0032] Pole pieces 5A, 5B are steel components that have magnetic force due to contact with magnet 4 described later. In the present embodiment, pole piece 5A is a cylindrical steel component (magnetic core), and pole piece 5B is a steel screw. Since pole pieces 5A, 5B are magnetic, two coils 2A, 2B are formed by pole pieces 5A, 5B, winding frames 21A, 21B, and coil conductors 22A, 22B. Therefore, the pickup 10 of the present embodiment is a double-coil pickup having two coils 2A, 2B. Since pole piece 5B has a threaded structure, the configuration of pole piece 5B in the up and down directions can be adjusted. As Figure 1 to Figure 3 As shown, two coils 2A and 2B are arranged side by side on the substrate 3. More specifically, the coils 2A and 2B are arranged side by side so that their longitudinal directions are parallel to the Z direction.

[0033] {3. Composition of the substrate}

[0034] like Figure 1As shown, a substrate 3 is arranged below the coil 2. In this embodiment, the substrate 3 is a printed circuit board. Specifically, the substrate 3 is a printed circuit board made of glass epoxy resin material, and a circuit pattern is formed on its upper surface. A magnet 4 is arranged on the bottom surface of the substrate 3.

[0035] Figure 4 It is a top view of the substrate 3. Six holes 33A for inserting the pole piece 5A are provided at equal intervals on the substrate 3. The six holes 33A are provided in a manner aligned with the six holes 23A of the winding frame 21A. In addition, two threaded holes 35A for inserting the screws 6A are provided on the inner side of the holes 33A at the left and right ends. Six holes 33B for inserting the pole piece 5B are provided at equal intervals on the substrate 3. The six holes 33B are provided in a manner aligned with the six holes 23B of the winding frame 21B. In addition, two threaded holes 35B for inserting the screws 6B are provided on the inner side of the holes 33B at the left and right ends.

[0036] like Figure 4 As shown, on the upper surface of the substrate 3, circuit pattern forming areas 31 are arranged at four locations. In areas 32 other than the circuit pattern forming areas 31, no circuit pattern is formed. That is, the area 32 is an area made of glass epoxy resin and does not contain a conductor. Holes 33A, 33B and threaded holes 35A, 35B are all provided in the circuit pattern forming area 31. In addition, a plurality of terminals 37a to 37h are provided in the circuit pattern forming area 31. It should be noted that the upper surface of the substrate 3 is an example of the first surface of the substrate of the present invention. The bottom surface of the substrate 3 is an example of the second surface of the substrate of the present invention.

[0037] like Figure 1 As shown, the lead wire 36 is connected to the terminal 37e. The terminal 37e is connected to the terminal 37a by the wiring 38a. One end of the coil wire 22A is connected to the terminal 37a (not shown). The other end of the coil wire 22A (not shown) is connected to the terminal 37b. The terminal 37b is connected to the terminal 37f by the wiring 38b. The terminal 37f is connected to the terminal 37g by the wiring 38c. One end 22Ba of the coil wire 22B is connected to the terminal 37g. The other end 22Bb of the coil wire 22B is connected to the terminal 37h. The lead wire 39 is connected to the terminal 37h. With such a structure, the coils 2A and 2B are connected in parallel between the lead wires 36 and 39. The lead wires 36 and 39 are connected to the control unit of the string instrument (for example, an electric guitar). Therefore, in the pickup 10, the converted electrical signal is supplied to the control unit of the string instrument.

[0038] {4. Composition of magnets}

[0039] like Figure 1As shown, the magnet 4 arranged below the substrate 3 is roughly rectangular in a plan view. When the pickup 10 is installed, the upper surface of the magnet 4 is arranged in contact with the bottom surface of the substrate 3. Furthermore, when the pickup 10 is installed, the magnet 4 is arranged in contact with the pole pieces 5A, 5B in an area lower than the bottom surface of the substrate 3. In this embodiment, as the magnet 4, an iron-chromium-cobalt magnet (FCC magnet) is used. In addition, as the magnet 4, a magnet such as aluminum-nickel-cobalt, ferrite, samarium-cobalt or neodymium can also be used.

[0040] Two threaded holes 45A for inserting screws 6A are provided in the magnet 4. The two threaded holes 45A are provided in a manner aligned with the positions of the two threaded holes 35A provided on the substrate 3. In front of the magnet 4, recesses 43B are formed at equal intervals in six locations in a manner capable of accommodating a portion of the pole piece 5B. The six recesses 43B are provided in a manner aligned with the six holes 33B of the substrate 3 and the six holes 23B of the winding frame 21B. The recesses 43B are an example of "holes for inserting the first pole piece or the second pole piece" of the present invention. In addition, recesses 45B are formed in two locations on the inner side of the recesses 43B at the left and right ends in a manner capable of accommodating a portion of the screw 6B. The two recesses 45B are provided in a manner aligned with the positions of the two threaded holes 35B provided on the substrate 3.

[0041] {5. Installation method}

[0042] The coil 2, substrate 3, magnet 4, and pole pieces 5A, 5B described above are aligned in the vertical direction and connected by screws 6A, 6B to form the pickup 10. Specifically, the six holes 23A of the winding frame 21A are aligned with the six holes 33A of the substrate 3, and the six pole pieces 5A are inserted into the holes 23A, 33A. The pole piece 5A through which the winding frame 21A and the substrate 3 pass is brought into contact with the upper surface of the magnet 4. And, the six holes 23B of the winding frame 21B, the six holes 33B of the substrate 3, and the six recesses 43B of the magnet 4 are aligned, and the six pole pieces 5B are inserted into the holes 23B, 33B. The pole piece 5B through which the winding frame 21B and the substrate 3 pass is brought into contact with the recess 43B of the magnet 4. In this state, the screw 6A is inserted into the threaded hole 45A and the threaded hole 35A, and is inserted into the threaded hole (not shown) formed on the bottom surface of the winding frame 21A and is screwed and fixed. In addition, the screw 6B is inserted into the recess 45B and the threaded hole 35B, and is inserted into the threaded hole (not shown) formed on the bottom surface of the winding frame 21B and is screwed and fixed. In this way, the coils 2A, 2B, the substrate 3, and the magnet 4 are fixed.

[0043] As described above, the pickup 10 of this embodiment is provided with the winding frame 21A and the winding frame 21B on the upper surface of the substrate 3, and the magnet 4 is provided on the bottom surface of the substrate 3. As a result, the complexity of the installation operation of the pickup 10 is reduced. In other words, it is only necessary to fix the coil 2 and the magnet 4 above and below the substrate 3, and the installation operation is easy. In addition, since the winding frame 21A and the winding frame 21B are directly arranged on the upper surface of the substrate 3, the verticality of the winding frame 21A and the winding frame 21B relative to the plane of the substrate 3 is improved. As a result, the verticality of the pole pieces 5A, 5B relative to the plane of the substrate 3 is improved, and the contact accuracy of the pole pieces 5A, 5B and the magnet 4 is improved. Therefore, since the pickup 10 of this embodiment has high installation accuracy, the contact accuracy of the pole pieces 5A, 5B and the magnet 4 is also high, and high gain can be obtained.

[0044] Furthermore, in the pickup 10 of the present embodiment, a printed circuit board is used as the substrate 3. Thus, since the linearity or planarity of the substrate 3 is ensured, the mounting accuracy of the pickup 10 is improved.

[0045] Furthermore, in the pickup 10 of this embodiment, a recess 43B is provided for inserting the pole piece 5B into the magnet 4. This allows the magnet 4 to be expanded to the periphery of the pole piece 5B and the volume of the magnet 4 to be increased. Therefore, a large magnetic force can be applied to the pole pieces 5A and 5B.

[0046] Furthermore, in the pickup 10 of the present embodiment, a circuit pattern is formed on the substrate 3, and the ends of the coil conductors 22A and 22B are connected to the circuit pattern formed on the substrate 3. Thus, the wiring work becomes extremely easy during the installation work of the pickup 10. Furthermore, the length of the lead wires around the pickup 10 can be shortened, thereby achieving a simple structure.

[0047] Furthermore, in the pickup 10 of the present embodiment, it is possible to suppress the eddy current generated in the substrate 3 . Figure 5 3 is a diagram showing eddy currents generated on the substrate 3. As described above, the substrate 3 is provided with a region 32 where no circuit pattern is formed, and the circuit pattern forming region 31 is divided at four locations. In other words, the circuit pattern is configured so as to avoid forming a loop path as much as possible. For example, Figure 5 As shown in FIG. 1 , a pattern segmentation region 32S is formed between two circuit pattern formation regions 31. As a result, although an eddy current as shown in R1 may be generated, an eddy current as shown in R2 is not generated. In this way, in the pickup 10 of this embodiment, the generation of eddy currents can be suppressed, the gain of the pickup 10 can be prevented from being reduced, and the influence of noise on the conversion from string vibration to electrical signals can be suppressed.

[0048] Furthermore, in the pickup 10 of the present embodiment, the pole piece 5A is installed in such a manner that the bottom surface is in contact with the upper surface of the magnet 4. In the known structure in which a magnet and a coil are arranged on a substrate, the pole piece of the core structure is in linear contact with the magnet from the lateral direction. According to the present embodiment, since the bottom surface of the pole piece 5A is in surface contact with the upper surface of the magnet 4, the contact area between the pole piece 5A and the magnet 4 becomes larger, and a large magnetic force can be provided to the pole piece 5A.

[0049] [2] Second Embodiment

[0050] Next, a pickup 10A according to a second embodiment of the present invention will be described. In the pickup 10A, the configurations of the coil 2 , the substrate 3 , and the pole pieces 5A and 5B are the same as those of the first embodiment. The pickup 10A differs from the pickup 10 in the configuration of the magnet 4A. Figure 6 It is an exploded view of a pickup 10A according to the second embodiment. Figure 7 It is a side view of the pickup 10A.

[0051] like Figure 6 As shown, the magnet 4A does not have recesses 43B, 45B as the magnet 4. A metal plate, namely a positioning frame 7, is arranged on the front side of the magnet 4A. When the pickup 10 is installed, the magnet 4A and the positioning frame 7 are arranged in a manner that their respective upper surfaces are in contact with the bottom surface of the substrate 3. In addition, when the pickup 10 is installed, the back side of the positioning frame 7 is arranged in a manner that is in contact with the front of the magnet 4 in an area lower than the bottom surface of the substrate 3. In this embodiment, the positioning frame 7 is made of steel. Six holes 73B are provided at equal intervals on the positioning frame 7. The hole 73B is a hole that penetrates the positioning frame 7 in the up and down direction. Each hole 73B is for inserting the pole piece 5B. Alternatively, the hole 73B may not penetrate the positioning frame 7. In addition, two threaded holes 75B for inserting the screws 6B are provided on the inner side of the holes 73B at the left and right ends.

[0052] The mounting method of the pickup 10A is the same as that of the pickup 10. In the pickup 10A, after the screw 6B is inserted into the threaded hole 75B, it is inserted into the base plate 3 and the winding frame 21B and screwed. After the magnetic pole piece 5B passes through the hole 23B of the winding frame 21B and the hole 33B of the base plate 3, it is inserted into the hole 73B of the positioning frame 7. The magnetic force of the magnet 4A is provided to the magnetic pole piece 5B inserted into the hole 73B of the positioning frame 7 via the steel positioning frame 7.

[0053] [3] Features and Effects of Embodiments

[0054] As described above, the string instrument pickup of the present embodiment includes: a substrate; a first winding frame and a second winding frame, which are arranged side by side on the first surface of the substrate; a first magnetic pole piece, which is inserted into the first winding frame and passes through the substrate; a second magnetic pole piece, which is inserted into the second winding frame and passes through the substrate; and a magnet, which is arranged on the second surface of the substrate on the opposite side to the first surface, and is in contact with the first magnetic pole piece and the second magnetic pole piece.

[0055] Since the winding frame and the magnet are arranged across the substrate, the installation operation becomes easy. Since the first winding frame and the second winding frame are arranged on the first surface of the substrate, it is easy to maintain the verticality of the axis of the winding frame relative to the substrate. By improving the installation performance, the gain of the pickup can be increased.

[0056] The substrate may include a non-magnetic material.

[0057] It is possible to suppress eddy current generated in the substrate.

[0058] It may be that the substrate comprises a printed circuit board.

[0059] Since the linearity (planarity) of the substrate is ensured, the mountability of the pickup is improved. The improvement in mountability can increase the gain of the pickup.

[0060] It may be that the printed circuit board comprises a glass epoxy material.

[0061] The strength of the substrate is improved.

[0062] The magnet may be provided with a hole for inserting the first magnetic pole piece or the second magnetic pole piece.

[0063] The volume of the magnet can be enlarged.

[0064] The device may further include a metal plate that is disposed on a second surface of the substrate that is opposite to the first surface, is in contact with the magnet, and into which the first magnetic pole piece or the second magnetic pole piece is inserted.

[0065] It is possible to configure a structure in which the pole piece is magnetized without processing the magnet.

[0066] A circuit pattern may be formed on the substrate, and the coil conductor wound around the first winding frame and the second winding frame may be connected to the circuit pattern.

[0067] Wiring the pickup is easier. The lead length around the pickup is shorter, and the structure is simpler.

[0068] The circuit pattern may include a region where the loop-shaped path is cut off.

[0069] It is possible to suppress eddy current generated in the substrate.

[0070] It may be that the first pole piece or the second pole piece is in surface contact with the magnet.

[0071] The contact surface between the pole piece and the magnet can be enlarged, thereby increasing the gain of the pickup.

[0072] The guitar according to the present embodiment includes any of the string instrument pickups described above.

[0073] [4] Modifications

[0074] Figure 8 1 is a diagram showing a pickup 10B of a modified example. The pickup 10B is an example in which the positional relationship between the substrate 3 and the magnet 4 is reversed compared to the pickup 10 of the first embodiment. After the pole piece 5A passes through the hole 23A, it contacts the upper surface of the magnet 4. After the pole piece 5B passes through the hole 23B, it is received in the recess 43B. The screw 6A is sequentially inserted into the threaded holes 35A and 45A, and is inserted into the threaded hole on the bottom surface of the winding frame 21A to be threadedly fixed. The screw 6B is inserted into the threaded hole 35B and the recess 45B, and is further inserted into the threaded hole on the bottom surface of the winding frame 21B to be threadedly fixed. It should be noted that in the accompanying drawings, the same substrate 3 as in the first embodiment is used, but the holes 33A and 33B may not be provided.

[0075] In this modification, since a printed circuit board is used as the substrate 3, the plane of the substrate 3 is highly accurate, and the mounting accuracy of the pickup 10B can be improved. As a result, the contact accuracy between the pole pieces 5A, 5B and the magnet 4 is improved, and the gain of the pickup can be increased.

[0076] [5] Other embodiments

[0077] In the above embodiment, a printed circuit board is used as the substrate 3. Other components capable of maintaining a high level of plane accuracy may be used as the substrate 3. By using a non-magnetic material as the substrate 3, eddy current generated on the substrate 3 can be suppressed.

[0078] In the pickups 10 and 10A of the first and second embodiments, the coil 2 and the magnets 4 and 4A are arranged above and below the substrate 3. That is, the coil 2 and the magnets 4 and 4A are mounted on the upper and lower surfaces of the substrate 3 by surface contact. Therefore, these components can be fixed by a bonding material instead of the screws 6A and 6B.

[0079] In the first embodiment, the recess 43B for inserting the pole piece 5B and the recess 45B for inserting the screw 6B are both semicircular in shape when viewed from above. As an alternative embodiment, the hole for inserting the pole piece 5B and the threaded hole for inserting the screw 6B may be circular in shape when viewed from above. Therefore, the volume of the magnet 4 can be further increased.

[0080] Description of Reference Numerals

[0081] 10, 10A, 10B…pickup; 2, 2A, 2B…coil; 21A, 21B…bobbin; 22A, 22B…coil conductor; 23A, 23B…hole; 3…substrate; 31…circuit pattern forming area; 32…area (no circuit pattern formed), 33A, 33B…hole; 35A, 35B…threaded hole; 36…conductor; 37a~37h…terminal; 38a~38c…wiring; 39…conductor; 4…magnet; 43B…recess; 45A…threaded hole; 45B…recess; 6A, 6B…screw.

Claims

1. A pickup for a stringed instrument, characterized in that: have: substrate; a first winding frame and a second winding frame, which are arranged in parallel on the first surface of the substrate; a first magnetic pole piece, which is inserted into the first winding frame and passes through the substrate; a second magnetic pole piece, which is inserted into the second winding frame and passes through the substrate; A magnet is disposed on a second surface of the substrate that is opposite to the first surface and is in contact with the first pole piece and the second pole piece.

2. The string instrument pickup according to claim 1, The substrate includes a non-magnetic material.

3. The string instrument pickup according to claim 1, The substrate includes a printed circuit board.

4. The string instrument pickup according to claim 3, The printed circuit board includes a glass epoxy material.

5. The string instrument pickup according to any one of claims 1 to 4, The magnet is provided with a hole for inserting the first pole piece or the second pole piece.

6. The string instrument pickup according to any one of claims 1 to 4, A metal plate is further provided, which is arranged on a second surface of the substrate which is opposite to the first surface, is in contact with the magnet, and into which the first magnetic pole piece or the second magnetic pole piece is inserted.

7. The string instrument pickup according to claim 3 or 4, A circuit pattern is formed on the substrate, and the coil conductor wound around the first winding frame and the second winding frame is connected to the circuit pattern.

8. The string instrument pickup according to claim 7, The circuit pattern has a region where a loop-shaped path is cut off.

9. The string instrument pickup according to any one of claims 1 to 4, The first pole piece or the second pole piece is in surface contact with the magnet. 10 . A guitar comprising the string instrument pickup according to claim 1 .

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