Moving coil for flat speaker

Abstract

The movable coil for the flat speaker of the embodiment of the present invention includes a PCB coil and a metal coil. The PCB coil board is formed into a single layer or multiple layers by a single or multiple layers. For the PCB coil, the spiral coil traces patterned and printed on the single-layer or multi-layer PCB coil board are electrically connected to each other. The metal coil is electrically connected to the PCB coil and wound into a planar spiral. The spiral coil trace includes a straight-line interval effective trace patterned on the upper and lower sides of one side of the PCB coil board, and an idle trace patterned on the left and right sides of one side of the PCB coil board. The straight-line interval effective trace is formed by connecting multiple lines in parallel, and the idle trace is formed by a single line, and multiple lines and the single line are repeated to form a spiral coil trace.

Description

Technical Field

[0001] The present invention relates to a movable coil for a flat panel speaker, and more specifically to a movable coil for a flat panel speaker that maximizes the induced electromotive force and controls the impedance by electrically connecting a multilayer PCB coil board with a spiral coil trace printed on a side pattern and a spiral metal coil wound in a plane. Background Art

[0002] The movable coil plate used in the flat speaker is formed by winding or pattern printing a movable coil on one or both sides of a plate-shaped coil base in an elliptical shape.

[0003] When current flows through the movable coil in the movable coil plate, the current generated by this current generates a magnetic field around the movable coil that expands and contracts at the same frequency as the audio signal. The movable coil is in the magnetic field generated by the magnet in the speaker unit. Therefore, this magnetic field interacts with the magnetic field generated by the movable coil, causing the movable coil plate to move up and down. Since the movable coil plate is connected to the vibration plate of the speaker unit, the vibration plate pushes the air during its up and down movement, and sound is emitted through the vibration of the air.

[0004] The development trend of such flat panel speakers is to increase the output capacity and make the size of the flat panel speakers increasingly thin and long. In order to increase the output capacity of the flat panel speakers, the development of flat panel speakers with structures combining multiple magnetic circuits has also become an important issue.

[0005] In order to realize a flat speaker, a movable coil plate that functions as a bobbin of the movable coil is made into a plate shape, and the movable coil is formed on one or both sides of the plate-shaped movable coil plate.

[0006] As a movable coil suitable for a flat speaker, when a copper wire is wound into a flat surface and attached to a bobbin for use, it is difficult to electrically connect the movable coil to an external lead wire. When the number of turns of the trace is increased in order to increase the inductance (L value) of the movable coil, the impedance (Impedance) of the movable coil increases in proportion to its weight. When the number of turns of the trace is reduced in order to reduce the impedance and weight of the movable coil, the inductance decreases in proportion. Therefore, there is a contradiction in that the efficiency of the flat speaker decreases.

[0007] Furthermore, when a printed circuit board coil (PCB (Printed Circuit Board) Coil) is used as a movable coil for a flat-panel speaker, the above-mentioned problem cannot be fundamentally solved. Even if micro-process printed circuit technology is used in the PCB, uniform quality cannot be maintained, and a significant increase in costs cannot be avoided.

[0008] In the past, there have been studies on increasing the number of windings of the coil of the multi-layered PCB pattern voice coil film to increase the induced electromotive force of the movable coil. However, the above studies have the disadvantage that only a multi-layer structure with more than four layers can be used, and the defects of unnecessary left and right lateral vibration force and increased weight cannot be improved.

[0009] Therefore, research is needed that can significantly solve the problems of conventional movable coils for flat panel speakers.

[0010] [Prior art literature]

[0011] (Patent Document 1) Korean Patent No. 1147904 (published on May 24, 2012) Summary of the invention

[0012] Technical issues

[0013] The object of the present invention is to provide a movable coil for a flat speaker which can significantly improve the performance of the movable coil by combining a PCB coil and a metal coil to increase the overall induced electromotive force of the movable coil and minimize the impedance.

[0014] However, the purpose of the present invention is not limited to the above purpose, and various extensions can be made without departing from the scope of the idea and field of the present invention.

[0015] Technical Solution

[0016] In order to achieve the purpose of the present invention, the movable coil for the flat speaker of the embodiment of the present invention includes a PCB coil and a metal coil. The PCB coil board is formed into a single layer or multiple layers by a single or multiple layers. For the PCB coil, the spiral coil traces printed on the single-layer or multi-layer PCB coil board are electrically connected to each other. The metal coil is electrically connected to the PCB coil and wound into a planar spiral. The coil traces include effective traces in a straight line interval respectively printed on the upper and lower sides of one side of the PCB coil board, and idle traces respectively printed on the left and right sides of one side of the PCB coil board. The effective traces in the straight line interval are formed by connecting multiple lines in parallel, and the idle traces are formed by a single line, and the multiple lines and the single line are repeated to form a spiral coil trace.

[0017] According to one embodiment, the multi-layer PCB coil board includes a first through hole (ViaHole) formed on the inner side and a second through hole formed on one end. The inner front end of the coil trace is electrically connected to the first through hole, and the outer front end of the coil trace is electrically connected to the second through hole. For the coil traces pattern-printed on the multi-layer PCB coil board, the first through holes and the second through holes are electrically short-circuited.

[0018] According to one embodiment, the multi-layer PCB coil board also includes a third through hole formed at the other end. One end of the metal coil is electrically connected to the first through hole of the designated PCB coil board in the multi-layer PCB coil board, and the other end is electrically connected to the third through hole of the designated PCB coil board.

[0019] According to one embodiment, the metal coil has a single or multiple coil wires, each end of the coil wires is electrically connected to the first through hole of the designated PCB coil board, and each other end is electrically connected to the third through hole of the designated PCB coil board.

[0020] According to one embodiment, the second through hole is electrically connected to a first lead wire, and the third through hole is electrically connected to a second lead wire.

[0021] According to one embodiment, the spiral coil of the metal coil is arranged at a position opposite to the spiral coil trace of the PCB coil.

[0022] According to one embodiment, the PCB coil board is a multi-layer structure, the metal coil is a single-layer structure, the PCB coils are connected in parallel with each other, and the metal coil and the PCB coil are connected in series.

[0023] Technical Effects

[0024] According to the movable coil for a flat panel speaker of the embodiment of the present invention, the induced electromotive force of the entire movable coil can be increased by combining the PCB coil and the metal coil.

[0025] In addition, the number of turns of the PCB coil and the metal coil can be significantly increased and the impedance can be minimized, thereby controlling the impedance.

[0026] Furthermore, the weight and production cost can be reduced.

[0027] Also, it is easy to design a PCB coil board with a coil printed on it.

[0028] However, the effects of the present invention are not limited to the above effects, and various extensions can be made without departing from the scope of the idea and field of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1A schematic diagram showing a PCB coil board of a movable coil for a flat speaker according to an embodiment of the present invention;

[0030] Figure 2 For local magnification Figure 1 Schematic diagram of the PCB coil board;

[0031] Figure 3 To show Figure 1 A schematic diagram showing the electrical connection relationship between the PCB coil board having multiple layers;

[0032] Figure 4 A cross-sectional view showing a metal coil of a movable coil for a flat speaker according to an embodiment of the present invention;

[0033] Figure 5 To show Figure 3 The multi-layer PCB coil board shown in Figure 4 Schematic diagram of the electrical connection relationship between the metal coils shown.

[0034] Description of Reference Numerals

[0035] 10, 10', 10": PCB coil board 11, 11', 11": first through hole

[0036] 13, 13', 13": second through hole 15: third through hole

[0037] 11a, 13a, 15a: copper foil 20, 20', 20": PCB coil

[0038] 21: Coil trace 21a: Straight section effective trace

[0039] 21b: Idle trace 30: Metal coil

[0040] 40: First lead wire 41: Second lead wire DETAILED DESCRIPTION

[0041] In order not to confuse the main idea of ​​the present invention, the detailed description of the components of the present invention that can be clearly understood and easily reproduced by those skilled in the art through the prior art is omitted.

[0042] The movable coil for a flat panel speaker according to an embodiment of the present invention will be described below.

[0043] However, the following description of general components of the flat-panel speaker, such as the damper, base frame, magnet, magnet plate, and vibration plate, will be omitted and will not be shown in the drawings.

[0044] The movable coil for the flat panel speaker of the embodiment of the present invention includes a PCB coil 20 and a metal coil 30 .

[0045] Figure 1 Schematic diagram of a PCB coil board of a movable coil for a flat speaker according to an embodiment of the present invention. Figure 2 For local magnification Figure 1 Schematic diagram of the PCB coil board.

[0046] See also Figure 1 and Figure 2 , the PCB coil 20 pattern is printed on the PCB coil board 10.

[0047] The PCB coil board 10 is a PCB (Printed Circuit Board), that is, a coil base (CoilBase) in the shape of a plate (Plate), and a coil (PCB coil 20) with high conductivity is printed on one side of the coil base.

[0048] The PCB coil 20 is pattern-printed on the PCB coil board 10 into a spiral coil trace 21 (CoilTrack).

[0049] The spiral coil trace 21 includes a straight-section effective trace 21 a and an idle trace 21 b .

[0050] The effective traces 21a in the straight section are pattern-printed on the upper side and the lower side of one side of the PCB coil board 10, and the idle traces 21b are pattern-printed on the left side and the right side of one side of the PCB coil board 10.

[0051] The effective trace 21a of the straight section is formed by connecting a plurality of lines in parallel, and the idle trace 21b is formed by a single line. In addition, the plurality of lines and the single line are repeatedly formed to form the spiral coil trace 21.

[0052] Specifically, in the effective straight-line interval trace 21a (the effective straight-line interval trace 21a pattern printed on the upper side of one side of the PCB coil board 10) on the PCB coil board 10 where the current flows in a direction 90 degrees to the direction of the magnet plate (Magnet Plate) of the magnetic circuit (the direction of the magnetic field flowing from the N pole to the S pole), the current flows in multiple lines, in the idle trace 21b pattern printed on the left and / or right side of one side of the PCB coil board 10 that does not correspond to the direction of the magnetic field, the current flows in a single line, and then in the effective trace in the reverse current direction (the effective straight-line interval trace 21a pattern printed on the lower side of one side of the PCB coil board 10) in the PCB coil board 10 that serves as the interval of the reverse magnetic field of the magnetic circuit, the current flows in multiple lines again. The spiral coil trace 21 is pattern-printed repeatedly on the entire PCB coil board 10.

[0053] This can maximize the total length of all effective traces that respond to the direction of the magnetic field (inductance value, L value) while minimizing the overall impedance (Impedance) value of the PCB coil board 10 by allowing current to flow through multiple lines, thereby maximizing the performance of the movable coil for the flat panel speaker.

[0054] According to the embodiment of the present invention, the widths of the multiple lines constituting the straight section effective trace 21a may be the same or different. Furthermore, the multiple lines are arranged at a specified distance, which may be the same or different.

[0055] The PCB coil board 10 includes a first through hole 11 (Via Hole) formed on the inner side and a second through hole 13 formed on one end. In addition, the PCB coil board 10 also includes a third through hole 15 formed on the other end.

[0056] Copper foil portions 11a, 13a, 15a may be formed on the first through hole 11, the second through hole 13, and the third through hole 15 of the PCB coil board 10, respectively, and welding may be performed on each of the copper foil portions 11a, 13a, 15a.

[0057] The first through hole 11 is electrically connected to the inner front end of the coil trace 21 , and the second through hole 13 is electrically connected to the outer front end of the coil trace 21 .

[0058] The other end of the metal coil 30 described below is electrically connected to the third through hole 15. Specifically, one end of the metal coil 30 is electrically connected to the first through hole 11 of the designated PCB coil board 10 in the multi-layer PCB coil board 10, and the other end is electrically connected to the third through hole 15 of the designated PCB coil board 10. Here, the so-called electrical connection with the first through hole 11 means welding to the copper foil portion 11a formed in the first through hole 11 to be electrically connected to the first through hole 11, and the so-called electrical connection with the third through hole 15 means being electrically connected to the third through hole 15 by welding to the copper foil portion 15a formed in the third through hole 15.

[0059] Figure 3 To show Figure 1 The PCB coil board is a schematic diagram of multiple layers and the electrical connection relationship between them.

[0060] See also Figures 1 to 3 The PCB coil boards 10, 10', 10" of the movable coils for the flat-panel speakers of the embodiments of the present invention can be formed by a single or multiple layers. The spiral coil traces 21 can be pattern-printed on the single-layer PCB coil boards 10, 10', 10". In addition, the spiral coil traces 21 can be pattern-printed on the multi-layer PCB coil boards 10, 10', 10", respectively, and can be electrically connected to each other (A, B).

[0061] The coil traces 21 pattern-printed on the multi-layer PCB coil boards 10, 10', 10" respectively, the first through holes 11, 11', 11" are electrically short-circuited (short) (A), and the second through holes 13, 13', 13" are electrically short-circuited (short) (B). That is, according to the coil traces 21 pattern-printed on the multi-layer PCB coil boards 10, 10', 10" respectively, for the first through holes 11, 11', 11", the first through holes 11, 11', 11" are electrically short-circuited (short) (A), and for the second through holes 13, 13', 13", the second through holes 13, 13', 13" are electrically short-circuited (short) (B). Therefore, the PCB coils 20, 20', 20" are connected in parallel with each other.

[0062] By electrically short-circuiting (A) the first through holes 11, 11', 11" respectively formed on the multiple PCB coil boards 10, 10', 10", and electrically short-circuiting (B) the second through holes 13, 13', 13" to each other, that is, by short-circuiting (A, B) all the multi-layer PCB coil boards 10, 10', 10" through the first through holes 11, 11', 11" and the second through holes 13, 13', 13", a minimum impedance can be achieved.

[0063] When the PCB coil plates 10, 10', 10" have a multi-layer structure, the induced electromotive force can be greatly increased and the impedance value can be greatly reduced.

[0064] Figure 4 This is a cross-sectional view showing a metal coil of a movable coil for a flat panel speaker according to an embodiment of the present invention.

[0065] See also Figures 1 to 4 The metal coil 30 is electrically connected to the PCB coil 20 and is wound into a planar spiral shape. The metal coil 30 may be a copper coil, or other metals with high conductivity.

[0066] The shape of the metal coil 30 wound into a plane spiral shape may be the same as or similar to the shape of the spiral coil trace 21 of the PCB coil 20 .

[0067] The spiral coil of the metal coil 30 may be arranged at a position opposite to (corresponding to) the spiral coil trace 21 of the PCB coil 20. This is to make the influence of the magnetic field the same.

[0068] One end a1 of the metal coil 30 is electrically connected to the first through hole 11 of the designated PCB coil board 10 in the multi-layer PCB coil board 10, and the other end a2 is electrically connected to the third through hole 15 of the designated PCB coil board 10. Specifically, one end a1 of the metal coil 30 is welded to the copper foil portion 11a formed in the first through hole 11 to be electrically connected to the first through hole 11, and the other end a2 can be welded to the copper foil portion 15a formed in the third through hole 15 to be electrically connected to the third through hole 15.

[0069] The multi-layer PCB coil boards 10, 10', 10" are all electrically short-circuited (A, B), and the first through hole 11 and the third through hole 15 of the PCB coil board 10 designated in the electrically short-circuited multi-layer PCB coil boards 10, 10', 10" may be respectively formed with welding copper foil portions 11a, 15a for electrical connection with the metal coil 30.

[0070] One end a1 of the metal coil 30 is welded to the copper foil portion 11a formed in the first through hole 11 of the designated PCB coil board 10, and the other end a2 of the metal coil 30 may be welded to the copper foil portion 15a formed in the third through hole 15 for electrical connection.

[0071] The first through hole 11 and the third through hole 15 of the multi-layer PCB coil board 10 electrically connected to the metal coil 30 may be respectively formed with copper foil portions 11a and 15a, and soldering may be performed on each of the copper foil portions 11a and 15a. The soldering copper foil portions 11a and 15a formed on the through holes 11 and 15 make it easy to connect to the external metal coil 30.

[0072] By matching the impedance of all movable coils by electrically connecting (welding) the metal coil 30 to the copper foil portions 11a, 15a formed in the through holes 11, 15, the induced electromotive force of the PCB coil 20 and the induced electromotive force of the metal coil 30 are added together, thereby obtaining a movable coil for a flat panel speaker with significantly high performance.

[0073] The coil wire (strand wire) of the metal coil 30 may be single or multiple. Figure 4 (a) shows the case where the coil wire of the metal coil 30 is a single one. Figure 4 (b) shows a case where the metal coil 30 has two coil wires.

[0074] When there are multiple coil wires of the metal coil 30, each end a1, b1 of the coil wire is welded to the copper foil portion 11a of the first through hole 11 formed in the designated PCB coil board 10 in the multi-layer PCB coil board 10 for electrical connection, and each other end a2, b2 is welded to the copper foil portion 15a of the third through hole 15 formed in the designated PCB coil board 10 for electrical connection.

[0075] For the metal coil 30, when the number of coil wires wound increases, the impedance increases in proportion to the weight, so the efficiency of the speaker decreases. To prevent this, the coil wire of the metal coil 30 can be wound into a flat spiral shape with two or three strands of wire.

[0076] Specifically, the inductance (L value) can be increased by increasing the number of coil wires of the metal coil 30, thereby increasing the induced electromotive force. Adding (adding) one strand of coil wire is not a solution in terms of impedance and weight, but if the cross-sectional area of ​​the coil wire is made, for example, 1 / 2, the weight is the same when two strands are wound, but the inductance (L value) can be doubled. In this way, the coil wire of the metal coil 30 can be wound into a planar spiral shape using two or three strands of wire.

[0077] When the metal coil 30 has a plurality of coil wires, the induced electromotive force can be increased by more than two times, which is advantageous for controlling impedance.

[0078] When there are a plurality of coil wires of the metal coil 30 , each coil wire is soldered to the copper foil portions 11 a and 15 a formed in the through holes 11 and 15 of the PCB coil board 10 , so that all the metal coils 30 can be electrically connected.

[0079] In summary, in order to reduce impedance and weight and increase induced electromotive force, the metal coil 30 can use multiple coil wires (strands), for example, the cross-sectional area of ​​the metal coil 30 is reduced to 1 / 2 or 1 / 3, and two or three strands are wound into a planar spiral. In this case, the induced electromotive force (L value) can be increased to two or three times while maintaining the same weight and impedance. Of course, the metal coil 30 can be wound into a planar spiral with one strand and then combined with the PCB coil board 10 (combined with the PCB coil 20).

[0080] Figure 5 To show Figure 3 The multi-layer PCB coil board shown in Figure 4 Schematic diagram of the electrical connection relationship between the metal coils shown.

[0081] See also Figures 1 to 5 , multiple layers can be formed by multiple PCB coil boards 10, 10', 10". The multi-layer PCB coil boards 10, 10', 10" are respectively pattern-printed with spiral coil traces 21, which can be electrically connected to each other (A, B).

[0082] The coil traces 21 pattern-printed on the multi-layer PCB coil boards 10, 10', 10" are electrically short-circuited (short) to each other at the inner front end of the traces through the first through holes 11, 11', 11" (A), and are electrically short-circuited (short) to each other at the outer front end of the traces through the second through holes 13, 13', 13" (B). Therefore, the PCB coils 20, 20', 20" are connected in parallel to each other.

[0083] Furthermore, one end a1 of the metal coil 30 is electrically connected to the first through hole 11 of the designated PCB coil board 10 in the multilayer PCB coil board 10 through the copper foil portion 11a (C), and the other end a2 is electrically connected to the third through hole 15 of the designated PCB coil board 10 through the copper foil portion 15a (D). The metal coil 30 is connected in series with the PCB coil 20.

[0084] By allowing current to flow through multiple lines on the effective traces 21a of the PCB coil 20 printed with a pattern on the PCB coil board 10, the impedance can be reduced while increasing the number of turns of the coil. By short-circuiting all the multi-layer PCB coil boards 10 in parallel, the impedance of the multi-layer PCB coil board 10 as a whole can be reduced to nearly 0 ohms. A single or multiple metal coils 30 can be combined therewith to control the impedance of all movable coils using the impedance of the metal coils 30.

[0085] More specifically, when the impedance of the movable coil for the flat-panel speaker that the user wants is 16 ohms, the impedance of the multi-layer PCB coil board 10 as a whole is close to 0 ohms, so the metal coil 30 with an impedance of 16 ohms can be connected in series to the PCB coil 20 to manufacture a movable coil for the flat-panel speaker with an impedance of 16 ohms.

[0086] Figure 5 In the case where there are two coil wires of the metal coil 30 shown, each end a1, b1 of the coil wire is soldered to the copper foil portion 11a of the first through hole 11 formed in the designated PCB coil board 10 in the multi-layer PCB coil board 10 and is electrically connected (C), and each other end a2, b2 is soldered to the copper foil portion 15a of the third through hole 15 formed in the designated PCB coil board 10 and is electrically connected (D).

[0087] The second through hole 13 of a designated PCB coil board 10 in the multi-layer PCB coil board 10 is electrically connected to the first lead wire 40 (Lead Wire), and the third through hole 15 of the designated PCB coil board 10 is electrically connected to the second lead wire 41 .

[0088] When the through holes 13 and 15 of the PCB coil plate 10 are formed with the copper foil portions 13 a and 15 a , the movable coil and the external lead wires 40 and 41 can be easily electrically connected.

[0089] The copper foil portions (copper foil portions for welding) 11a, 13a, 15a may be formed only in the through holes 11, 13, 15 of the PCB coil board 10 that are electrically connected to the metal coil 30 and / or the external lead wires 40, 41 in the multi-layer PCB coil board 10. The reason for this is that if the copper foil portions 11a, 13a, 15a are formed on the through holes 11, 13, 15 of the multi-layer (multiple) PCB coil board 10, the weight is too large.

[0090] The first through holes 11, 11', 11" of the multi-layer PCB coil boards 10, 10', 10" are electrically short-circuited (A), so the first lead wire 40 can be electrically connected to the second through hole 13 of more than one PCB coil board 10 in the multi-layer PCB coil boards 10, 10', 10".

[0091] The second lead wire 41 may be electrically connected to a designated third through hole 15 of the PCB coil board 10 electrically connected to the other end of the metal coil 30 .

[0092] In the movable coil for the flat speaker of the embodiment of the present invention, the PCB coil plate 10 is a multi-layer structure, and the metal coil 30 can be a single-layer structure.

[0093] The PCB coils 20 with patterns printed on the multi-layer PCB coil board 10 are connected in parallel with each other, and the metal coil 30 can be connected in series with the PCB coil 20 .

[0094] The movable coil for the flat speaker of the embodiment of the present invention includes a PCB coil 20 and a metal coil 30 , so that the impedance can be kept close to 1 ohm while maximizing the induced electromotive force.

[0095] By attaching a metal coil 30 wound with a single or multiple coil wires (strands) in a plane on a multi-layer PCB coil board 10 with all short circuits by using through holes, the induced electromotive force generated by the PCB coil 20 formed (pattern printed) on the multi-layer PCB coil board 10 is added to the induced electromotive force generated by the metal coil 30. Thus, a movable coil for a flat speaker with remarkable performance is completed.

[0096] The PCB coil 20 is constructed by connecting multiple lines in parallel in the effective traces 21a and 21b, and the pattern is printed on each of the short-circuited multi-layer PCB coil boards 10, so as to maximize the induced electromotive force while reducing the impedance of the entire PCB coil board 10 to almost below 1 ohm.

[0097] Furthermore, in the case of the metal coil 30, by ensuring data related to the impedance and weight based on the length, diameter, cross-sectional area and single / multiple of the coil wire, the ensured (accumulated) data can be easily utilized (i.e., the impedance proportional to the cross-sectional area and length of the metal coil 30 can be predicted). Therefore, by combining one or more metal coils 30 to the n-layer PCB coil board 10 according to the impedance to be applied, it is finally possible to manufacture a high-performance flat speaker movable coil by maximizing the induced electromotive force and controlling the impedance.

[0098] Furthermore, the micro-line (eg, 50 micron diameter) of the metal coil 30 has uniform performance compared to the micro-engineering of the PCB coil board (eg, 50 micron PCB etching) and is inexpensive to manufacture.

[0099] Also, the L value can be increased by using a plurality of coil wires (strands) of the metal coil 30 .

[0100] The movable coil for a flat panel speaker according to the embodiment of the present invention can manufacture a movable coil for a flat panel speaker with significantly high performance by combining the advantages of the PCB coil 20 and the metal coil 30 .

[0101] The movable coil for the flat speaker of the embodiment of the present invention can improve the induced electromotive force of the entire movable coil by combining the PCB coil 20 and the metal coil 30. In addition, the number of turns of the PCB coil 20 and the metal coil 30 is significantly increased and the impedance is minimized, so that the impedance can be controlled. In addition, the weight and manufacturing cost can be reduced, and the PCB coil board 10 can be easily designed.

[0102] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention, but are not limited to one embodiment. Furthermore, a person skilled in the art of the embodiment can implement the features, structures, effects, etc. illustrated in each embodiment by combining or modifying other embodiments. Therefore, the contents of these combinations and modifications should be deemed to be included in the scope of the present invention.

[0103] Furthermore, the above description is centered on the implementation mode, but these are merely examples and do not limit the present invention. A person skilled in the art of the present invention may also perform various modifications and applications not illustrated above within the scope of the essential characteristics of the present implementation mode. That is, each component specifically appearing in the implementation mode may be implemented in a modified manner. Furthermore, the differences in these modifications and applications shall be deemed to be included in the scope of the present invention as defined by the scope of the appended claims.

Claims

1. A movable coil for a flat speaker, comprising: A PCB coil having a spiral coil trace pattern printed on a PCB coil board and electrically connected to each other; as well as A metal coil connected in series with the PCB coil and wound into a planar spiral shape; The coil traces include effective straight line traces pattern-printed on the upper and lower sides of one side of the PCB coil board, and idle traces pattern-printed on the left and right sides of one side of the PCB coil board, The effective trace of the straight section is formed by connecting multiple lines in parallel, and the idle trace is formed by a single line, and the multiple lines and the single line are repeated to form a spiral coil trace, The spiral coil of the metal coil is arranged at a position opposite to the coil trace.

2. A movable coil for a flat speaker, comprising: A spiral coil trace pattern is printed on each of the multiple layers of the PCB coil board and electrically connected to each other; as well as A metal coil connected in series with the PCB coil and wound into a planar spiral shape; The coil traces include effective straight line traces pattern-printed on the upper and lower sides of one side of the PCB coil board, and idle traces pattern-printed on the left and right sides of one side of the PCB coil board, The effective trace of the straight section is formed by connecting a plurality of wires in parallel, and the idle trace is formed by a single wire, and the plurality of wires and the single wire are repeated to form a spiral coil trace. The spiral coil of the metal coil is arranged at a position opposite to the coil trace.

3. The movable coil for a flat panel speaker according to claim 2, wherein: The multi-layer PCB coil board includes a first through hole (ViaHole) formed on the inner side and a second through hole formed on one end. The inner front end of the coil trace is electrically connected to the first through hole, and the outer front end of the coil trace is electrically connected to the second through hole. For each coil trace pattern printed on the multi-layer PCB coil board, the first through holes and the second through holes are electrically shorted.

4. The movable coil for a flat panel speaker according to claim 3, wherein: The multi-layer PCB coil board includes a third through hole formed at the other end. One end of the metal coil is electrically connected to a first through hole of a designated PCB coil board in the multi-layer PCB coil board, and the other end is electrically connected to a third through hole of the designated PCB coil board.

5. The movable coil for a flat panel speaker according to claim 3, wherein: The multi-layer PCB coil plates also include a third through hole formed at the other end. The coil wire of the metal coil is single or multiple, Each one end of the coil wire is electrically connected to the first through hole of the designated PCB coil board, and each other end is electrically connected to the third through hole of the designated PCB coil board.

6. The movable coil for a flat speaker according to claim 4 or 5, wherein: The second through hole is electrically connected to a first lead wire, and the third through hole is electrically connected to a second lead wire.

7. The movable coil for a flat speaker according to claim 2, wherein: The PCB coil board is a multi-layer structure, and the metal coil is a single-layer structure. The PCB coils are connected in parallel with each other.

Images