Plane diaphragm loudspeaker
By using a double-sided coil reverse wiring design, the problem of uneven diaphragm force in traditional planar diaphragm speakers is solved, achieving higher sensitivity and a wider sound field, and improving sound separation and low-frequency performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional planar diaphragm speakers suffer from uneven force distribution on the diaphragm, resulting in insufficient driving area and sound pressure level, narrow signal coverage path, insufficient sound field width, low sound separation, and insufficient sensitivity.
The design employs a double-sided coil reverse wiring design, with the double-sided coils arranged in a staggered and interleaved layout. The signal paths are arranged in a staggered and interleaved manner on both sides, forming a mirror-symmetrical high-density double-layer circuit structure. The signal is conducted on the coil on side A, and the coil on side B is superimposed on the coil on side A after being vertically flipped.
It improves the uniformity of diaphragm stress and sensitivity, expands the sound field width, enhances signal enhancement, and improves sound separation and low-frequency extension.
Smart Images
Figure CN224097838U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a loudspeaker technical field, in particular to a kind of plane diaphragm loudspeaker of double-sided coil reverse wiring. BACKGROUND
[0002] Plane diaphragm loudspeaker is on plane diaphragm wiring conductor line, diaphragm is placed in magnetic field, and sound is generated by the synchronous movement of diaphragm driven in magnetic field through the current signal change in voice coil.The traditional plane diaphragm loudspeaker is mostly wired by single side, since conductor line is only arranged on the side of diaphragm, leading to uneven force distribution of diaphragm, influence driving area and sound pressure performance;Diaphragm wiring area utilization rate is low, leading to relatively narrow signal coverage path, insufficient sound field width, poor signal enhancement effect, insufficient sensitivity, lower tone quality separation degree, and improvement is needed. SUMMARY
[0003] The utility model aims at overcoming the shortcomings of prior art, provide a kind of plane diaphragm loudspeaker of double-sided coil reverse wiring, double-sided coil cross dislocation design, expand the signal coverage path of positive and negative surface cross circuit, improve the uniformity of diaphragm stress, sensitivity and sound field width.
[0004] To achieve the above object, the utility model adopts the following technical scheme:
[0005] A kind of plane diaphragm loudspeaker, including diaphragm;One side of diaphragm is equipped with A face coil, the other side of diaphragm is equipped with B face coil;A face coil is equipped with A face signal input end, A face signal output end on the side away from diaphragm, A face signal input end and A face signal output end on A face coil are symmetrically arranged, and the side edge of the side away from diaphragm of A face coil is equipped with A face signal lead-out end;
[0006] A face coil is equipped with A face small cycle part, and A face signal input end is arranged in the inside of A face small cycle part;A face signal input end leads out outer arc trace line, and outer arc trace line extends inwards after bending in U-shaped circuit, and returns to A face small cycle part;A face small cycle part tail end is connected with A face edge cycle part, and A face edge cycle part tail end is connected with A face signal lead-out end;
[0007] B face coil is equipped with B face signal lead-in end corresponding to A face signal lead-out end on A face coil, and B face signal lead-in end and A face signal lead-out end are in close proximity to conductive setting;B face coil is equipped with B face signal lead-out end corresponding to A face signal output end on A face coil, and B face signal lead-out end and A face signal output end are in close proximity to conductive setting;
[0008] The circuit of A face coil and B face coil is reversely symmetrically wired, and the circuit of A face coil and B face coil is cross dislocation arrangement in superposition area, and the signal path of double-sided coil in superposition area is same.
[0009] Further, in some embodiments, the outer arc track is connected to the distal return bend segment of the A-face small loop at the line extension segment, the top of the U-shaped line is provided with a proximal return bend segment of the A-face small loop, the distal return bend segment of the A-face small loop is connected to the proximal return bend segment of the A-face small loop through the line extension segment, and 2-4 U-shaped lines in sequence are arranged in communication; the distal return bend segment of the A-face small loop on the rear U-shaped line returns to the outer arc track to form a ring line loop of the A-face small loop, and the A-face small loop is provided with 3-5 ring line loops.
[0010] The arc length of the outer arc track is 1 / 6-1 / 4 of the arc length of the circular ring.
[0011] Further, in some embodiments, the distal return bend segment of the A-face small loop of the last U-shaped line of the A-face small loop is connected to the A-face edge loop.
[0012] The distal return bend segment of the A-face small loop of the last U-shaped line of the A-face small loop is connected to the edge track of the A-face edge loop, the edge track is bent to extend inward in the U-shaped line after extending around the ring and approaching the outer arc track, and the tail end of the A-face edge loop is connected to the A-face signal lead-out end.
[0013] Further, in some embodiments, the bottom of the U-shaped line of the A-face edge loop is provided with a distal return bend segment of the A-face large ring, the distal return bend segment of the A-face large ring is connected to a proximal return bend segment of the A-face large ring through the extension line, and the A-face edge loop is provided with a U-shaped line corresponding to the A-face small loop; the distal return bend segment of the A-face large ring on the inner U-shaped line of the A-face edge loop returns to the edge track to form a ring line loop; the A-face edge loop is provided with 2-4 ring line loops, and the tail end of the edge track of the innermost layer is connected to the A-face signal lead-out end.
[0014] Further, in some embodiments, the B-face coil is arranged corresponding to the line after the A-face coil is vertically flipped, the B-face coil line and the A-face coil line are symmetrically crossed in the superposition area, and the B-face coil line and the A-face coil line are connected in series.
[0015] The B-face signal lead-in end of the B-face coil leads out the B-face edge loop, the wire of the B-face edge loop extends around the ring and approaches the B-face signal lead-out end, and then is bent to extend inward in the U-shaped line, and the U-shaped line of the B-face edge loop is provided with a distal return bend segment and a proximal return bend segment corresponding to the proximal return bend segment and the distal return bend segment of the A-face large ring.
[0016] Further, in some embodiments, the B-face edge loop is provided with a ring line loop corresponding to the A-face edge loop, the B-face edge loop is connected to the B-face small loop after being circularly wound around 2-4 ring line loops, and the B-face small loop is provided with a ring line loop corresponding to the A-face small loop, and the tail end of the innermost layer of the B-face small loop is connected to the B-face signal lead-out end.
[0017] Further, in some embodiments, the A-side coil is provided with a membrane ring away from one side of the diaphragm, the membrane ring is provided with an A-magnet group, an A-magnetic sheet and an A-support in sequence away from one side of the A-side coil, and the A-support is provided with a circuit board and a tuning net away from the outer side of the A-side coil.
[0018] Further, in some embodiments, the A-side coil is provided with an A-side signal input end and an A-side signal output end on one side facing the A-support, the A-support is provided with through holes corresponding to the A-side signal input end and the A-side signal output end, and the circuit board is provided with spring guide columns on one side close to the A-support, the spring guide columns are connected in abutment with the A-side signal input end and the A-side signal output end on the A-side coil after passing through the through holes of the A-support.
[0019] Further, in some embodiments, the B-side coil is provided with a gasket away from one side of the diaphragm, the gasket is provided with a B-magnet group, a B-magnetic sheet, a B-support and a dustproof net in sequence away from one side of the B-side coil, and the dustproof net is provided with a shell away from the outer side of the B-side coil, and the shell covers the components from the dustproof net to the tuning net.
[0020] The double-sided coil cross-disection wiring feature of the diaphragm (diaphragm) of the utility model:
[0021] 1. Double-sided coil reverse layout:
[0022] The diaphragm (diaphragm) adopts double-sided coil reverse wiring design, after the combination of the double-sided coil, the A-side signal lead-out end and the B-side signal lead-in end are in abutment and conductive, the B-side signal lead-out end and the A-side signal output end are in abutment and conductive, so that the signal ends of the diaphragm are all on the A-side coil, the A-side signal input end and the A-side signal output end on the A-side coil guide the circuit board, the signal path directions of the double-sided coil in the superposition area are the same, and the signal enhancement effect is realized.
[0023] 2. Double-layer superposition design:
[0024] The double-layer circuit is overlapped in a mirror image symmetry way on the front and back (A-side, B-side), the circuit of the B-side (back) is the vertical flip of the A-side (front), mirror image symmetry layout is formed, the double-layer symmetry circuit superposition structure with high density and high reliability is formed by the superposition of the two layers of symmetry circuits on the front and back.
[0025] 3. Cross-disection structure:
[0026] The circuit of the front (A-side) and the back (B-side) is arranged in cross in the superposition area, the double-sided circuit cross-disection arrangement and symmetry cross wiring in the superposition area expand the signal coverage path of the cross circuit of the front and back, increase the circuit density, and reduce the signal interference or energy loss.
[0027] 4. Sensitivity improvement:
[0028] The circuit of the B face (back face) is a vertical flip of the A face (front face), the signal path directions of the double-sided coil in the superposition area are same, and the symmetry and consistency of the front and back circuits are ensured.
[0029] The utility model discloses a cross symmetry misplacement outlet layout, increase the effective area of two white membrane diaphragm and wire, improve the sensitivity of loudspeaker, sound field width, low frequency diving ability, sound quality separation degree etc. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 It is the combination structure diagram of double-sided coil of the embodiment of the application;
[0031] Figure 2 It is the electric signal in and out schematic diagram of B face coil of the embodiment of the application;
[0032] Figure 3 It is the assembly schematic diagram of double-sided coil of the embodiment of the application;
[0033] Figure 4 It is the electric signal schematic diagram of A face small circulation part of the embodiment of the application;
[0034] Figure 5 It is the electric signal schematic diagram of A face edge circulation part of the embodiment of the application;
[0035] Figure 6 It is the electric signal schematic diagram of B face edge circulation part of the embodiment of the application;
[0036] Figure 7 It is the electric signal schematic diagram of B face small circulation part of the embodiment of the application;
[0037] Figure 8 It is the structure schematic diagram of the embodiment of the application;
[0038] Figure 9 It is the circuit electric signal schematic diagram of the double-sided coil superposition area part of the embodiment of the application;
[0039] Figure 10 It is the signal sensitivity comparison chart.
[0040] BRIEF DESCRIPTION OF DRAWINGS
[0041] Housing 11, dust screen 12, B support 13, B magnetic sheet 14, B magnet group 15, gasket 16, diaphragm 18, membrane ring 19, A magnet group 21, A magnetic sheet 22, A support 23, spring guide column 24, circuit board 26, tuning net 27, A face coil 30, A face signal input end 31, A face signal output end 32, A face signal lead-out end 33, A face small circulation part 34, A face edge circulation part 35, outer arc trace 36, A face small circulation far end back bending section 37, A face small circulation near end back bending section 38, edge trace 39, B face coil 40, B face signal lead-in end 41, B face signal lead-out end 42, B face edge circulation part 43, B face small circulation part 44, A face large ring far end back bending section 46, A face large ring near end back bending section 47, B face far end back bending section 48, B face near end back bending section 49. DETAILED DESCRIPTION
[0042] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will combine the utility model specific embodiment and corresponding drawings to make the utility model technical scheme clear, complete description. Obviously, the described embodiment is only a part of the utility model embodiment, not all embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of the utility model protection.
[0043] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "transverse", "transverse", "upper", "lower", "front", "rear", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second" and the like are only for the description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.
[0044] Referring to the accompanying drawings, this application includes a diaphragm 18. One side of the diaphragm 18 has an A-side coil 30, and the other side has a B-side coil 40. A diaphragm ring 19 is located on the side of the A-side coil 30 away from the diaphragm 18. On the side of the diaphragm ring 19 away from the A-side coil 30, an A-magnet assembly 21, an A-magnetic sheet 22, and an A-support 23 are sequentially arranged outwards. A circuit board 26 and a tuning grille 27 are located on the outer side of the A-side coil 23 away from the A-side coil 30. An A-side coil 30 is positioned on the side facing the A-support 23. The A-side signal input terminal 31 and the A-side signal output terminal 32 are symmetrically arranged on the A-side coil 30. The A-side bracket 23 has through holes that match the A-side signal input terminal 31 and the A-side signal output terminal 32. The side of the circuit board 26 near the A-side bracket 23 is provided with a spring guide post 24. The spring guide post 24 passes through the through hole of the A-side bracket 23 and is tightly connected to the A-side signal input terminal 31 and the A-side signal output terminal 32 on the A-side coil 30.
[0045] A pad 16 is provided on the side of the B-side coil 40 away from the diaphragm 18. On the side of the pad 16 away from the B-side coil 40, a B magnet group 15, a B magnetic sheet 14, a B bracket 13, and a dustproof net 12 are arranged outward in sequence. A housing 11 is provided on the outer side of the dustproof net 12 away from the B-side coil 40. The housing 11 covers the components from the dustproof net 12 to the tuning net 27.
[0046] Furthermore, in one embodiment, see Appendix Figure 4 , attached Figure 4 The diagram shows a schematic of the winding conductor of the small loop section 34 (minor arc loop section) on side A. The signal input terminal 31 of the A-side coil 30 leads out an outer arc trace 36. After the outer arc trace 36 is bent, it extends inward in a U-shaped line. The outer arc trace 36 is connected to the far end return bend section 37 of the small loop section 34 on side A at the bottom of the U-shaped line through the line extension section. The top (open end) of the U-shaped line is provided with a near end return bend section 38 of the small loop section 38 on side A. The far end return bend section 37 of the small loop section 38 on side A is connected to the near end return bend section 38 of the small loop section 38 on side A through the line extension section. Two to four connected U-shaped lines are arranged in sequence. The small loop section 34 on side A preferably has three connected U-shaped lines. The far end return bend section 37 of the small loop section 37 on the rear U-shaped line returns to the outer arc trace 36 to form a loop circuit. The small loop section 34 on side A (minor arc loop section) is provided with three to five loop circuits. The small loop section 34 on side A preferably has four loop circuits.
[0047] The arc length of the outer arc trace 36 (minor arc part) is 1 / 6 to 1 / 4 of the arc length of the circular ring, preferably 1 / 5 of the arc length.
[0048] See appendix Figure 5 , attached Figure 5The diagram shows a schematic of the winding conductor of the edge loop section 35 (superior arc loop section) on the A-side. The far end bend 37 of the last U-shaped line of the small loop section 34 on the A-side connects to the edge loop section 35 (superior arc loop section) on the A-side; the A-side coil 30 is provided with an A-side signal lead-out terminal 33, and the tail end of the edge loop section 35 is connected to the A-side signal lead-out terminal 33; furthermore, the far end bend 37 of the last U-shaped line of the small loop section 34 on the A-side connects to the edge trace 39 of the edge loop section 35 on the A-side, and the edge trace 39 (superior arc loop line) extends around the loop and approaches the outer arc trace 36 before bending and extending inward in a U-shaped line.
[0049] The bottom of the U-shaped line of the edge circulation section 35 on the A-side is provided with a far-end return bend section 46 of the large loop on the A-side. The far-end return bend section 46 of the large loop on the A-side is connected to the near-end return bend section 47 of the large loop on the A-side through an extension line. The edge circulation section 35 on the A-side is provided with a U-shaped line that matches the small circulation section 34 on the A-side. The far-end return bend section 46 of the large loop on the A-side on the inner U-shaped line of the edge circulation section 35 returns to the edge trace 39 to form a loop circuit. The edge circulation section 35 on the A-side (superior arc circulation section) is provided with 2 to 4 loop circuits. The edge circulation section 35 on the A-side is preferably provided with 3 loop circuits. The tail end of the innermost edge trace 39 is connected to the signal lead-out terminal 33 on the A-side.
[0050] Figure 2 This is a schematic diagram of the electrical signal input and output of the B-side coil in an embodiment of this application, that is, a front view of the electrical signal input and output of the B-side coil.
[0051] See appendix Figure 6 , attached Figure 6 The diagram shows a schematic of the winding conductor of the B-side edge loop section 43 on the B-side coil 40. The B-side coil 40 is provided with a B-side signal input terminal 41 that matches the A-side signal output terminal 33 on the A-side coil 30. The B-side signal input terminal 41 and the A-side signal output terminal 33 are arranged in close proximity and are connected. The B-side coil 40 is also provided with a B-side signal output terminal 42 that matches the A-side signal output terminal 32 on the A-side coil 30. The B-side signal output terminal 42 and the A-side signal output terminal 32 are arranged in close proximity and are connected.
[0052] The B-side signal introduction end 41 of the B-side coil 40 leads out a B-side edge circulating part 43. The wire of the B-side edge circulating part 43 extends around a loop close to the B-side signal introduction end 42 and then bends to extend inward in a U-shaped line. The U-shaped line of the B-side edge circulating part 43 is provided with a B-side far-end return bending part 48 and a B-side near-end return bending part 49 which correspond to the A-side far-end return bending part 47 and the A-side far-end return bending part 46. The B-side edge circulating part 43 is provided with a loop line loop which corresponds to the A-side edge circulating part 35. The B-side edge circulating part 43 circulates around the loop line loop for 2-4 loops and then connects a B-side small circulating part 44. The B-side small circulating part 44 is provided with a loop line loop which corresponds to the A-side small circulating part 34. The tail end of the innermost B-side small circulating part 44 connects the B-side signal introduction end 42.
[0053] Further, in one of the embodiments, referring to the accompanying drawings Figure 3 , the accompanying drawings Figure 3 are assembly schematic diagrams of the double-sided coil of the present application, that is, a combined diagram of the A-side front view + B-side rear view. The B-side coil 40 is correspondingly arranged with the line after the A-side coil 30 is vertically flipped. The present application is described based on the orientation or positional relationship shown in the accompanying drawings for detailed technical features, rather than all embodiments. After the B-side coil 40 and the A-side coil 30 are combined on the diaphragm 18, the B-side coil 40 (back) is mirrored and overlaps the A-side coil 30 (front). The double-sided coil wiring, the A-side coil 30 line and the B-side coil 40 line are arranged in cross displacement in the overlapping area, symmetrically cross the wiring, and the signal path of the double-sided coil in the overlapping area is the same. The double-sided coil conductor is connected in series, and the side is in and out. The wires are electrically connected. The A-side coil 30 and the B-side coil 40 are arranged on the diaphragm 18 by etching process or bonding process.
[0054] After the double-sided coil is combined, the A-side signal introduction end 33 and the B-side signal introduction end 41 are in close proximity to conduct, and the B-side signal introduction end 42 and the A-side signal output end 32 are in close proximity to conduct, so that the signal ends of the diaphragm 18 are all on the A-side coil 30. The A-side signal input end 31 and the A-side signal output end 32 on the A-side coil 30 are connected to the circuit board 26.
[0055] The curve of the present application (sensitivity of the present application): the initial sensitivity is 121 DB. The curve is tested by using the cross symmetric wire diaphragm of the present application.
[0056] The curve of the existing product (sensitivity of the existing product): the initial sensitivity is 113.5 DB. It is the existing single-sided wire diaphragm product, and the curve is tested.
[0057] The average sensitivity of the present application is improved by 7-8 DB than that of the existing product.
[0058] The above detailed description includes references to the accompanying drawings, which form a part of the detailed description. The drawings show, by way of illustration, specific embodiments in which the application can be practiced. These embodiments are also referred to as "examples." Other elements, not shown or described, can be included. The present application is not limited to the specific embodiments described herein, but only by the claims. One skilled in the art would realize that the embodiments described herein can be changed in a manner many different ways, applications, systems, and / or materials without departing from the spirit and scope of the present application. Accordingly, the phrase "one example" as used herein includes "at least one example," such that when a feature is described as one example, at least one example of that feature is provided. Additionally, the features are capable of inclusion in other examples, such as in the context of other examples provided in this document, and / or in contexts not expressly given. Also, the terms "first," "second," "third," etc. are not used to denote any meaning other than the order elements appear in with respect to one another. The initial deployment of an element can be designated as a first element, and any subsequent deployment of that element can be designated as a second element.
Claims
1. A planar diaphragm loudspeaker, comprising: Diaphragm (18); characterized in that, one side of the diaphragm (18) is provided with an A-side coil (30) and the other side of the diaphragm (18) is provided with a B-side coil (40). The A-side coil (30) away from the diaphragm (18) is provided with an A-side signal input terminal (31) and an A-side signal output terminal (32). The A-side signal input terminal (31) and the A-side signal output terminal (32) on the A-side coil (30) are symmetrically arranged. The A-side coil (30) away from the diaphragm (18) is provided with an A-side signal lead-out terminal (33). The A-side coil (30) is provided with an A-side small loop section (34), and the A-side signal input terminal (31) is located close to the inner side of the A-side small loop section (34); the A-side signal input terminal (31) leads out an outer arc trace (36), and after the outer arc trace (36) is bent, it extends inward in a U-shaped line and returns to the A-side small loop section (34); the tail end of the A-side small loop section (34) is connected to the A-side edge loop section (35), and the tail end of the A-side edge loop section (35) is connected to the A-side signal lead-out terminal (33). The B-side coil (40) is provided with a B-side signal input terminal (41) that matches the A-side signal output terminal (33) on the A-side coil (30). The B-side signal input terminal (41) and the A-side signal output terminal (33) are connected in close proximity. The B-side coil (40) is provided with a B-side signal output terminal (42) that matches the A-side signal output terminal (32) on the A-side coil (30). The B-side signal output terminal (42) and the A-side signal output terminal (32) are connected in close proximity. The circuits of the A-side coil (30) and the B-side coil (40) are arranged in opposite symmetrical configurations. The circuits of the A-side coil (30) and the B-side coil (40) are arranged in a staggered manner in the superposition area. The signal paths of the two-sided coils in the superposition area are the same.
2. A planar diaphragm loudspeaker according to claim 1, characterized in that, The outer arc trace (36) is connected to the far end bend of the small loop on the A side at the bottom of the U-shaped line through the line extension section. The top of the U-shaped line is provided with a near end bend of the small loop on the A side (38). The far end bend of the small loop on the A side (37) and the near end bend of the small loop on the A side (38) are connected through the line extension section. 2 to 4 connected U-shaped lines are set in sequence. The far end bend of the small loop on the A side (37) on the U-shaped line returns to the outer arc trace (36) to form a loop of the small loop on the A side (34). The small loop on the A side (34) is provided with 3 to 5 loops. The arc length of the outer arc trace (36) is 1 / 6 to 1 / 4 of the arc length of the ring.
3. A planar diaphragm loudspeaker according to claim 2, characterized in that, The last U-shaped loop of the small loop on the A-side (34) is connected to the edge loop on the A-side (35) by the far end of the small loop. The last U-shaped line of the small loop section (34) of the A-side connects to the edge trace (39) of the edge loop section (35) of the A-side. The edge trace (39) extends around the outer arc trace (36) and then bends inward in a U-shaped line. The tail end of the edge loop section (35) of the A-side connects to the signal lead-out terminal (33) of the A-side.
4. A planar diaphragm loudspeaker according to claim 3, characterized in that, The bottom of the U-shaped line of the edge circulation section (35) of surface A is provided with a far-end bend section (46) of the large loop of surface A. The far-end bend section (46) of the large loop of surface A is connected to the near-end bend section (47) of the large loop of surface A through an extension line. The edge circulation section (35) of surface A is provided with a U-shaped line that matches the small circulation section (34) of surface A. The far-end bend section (46) of the large loop of surface A on the inner U-shaped line of the edge circulation section (35) of surface A returns to the edge trace (39) to form a loop circuit. The edge circulation section (35) of surface A is provided with 2 to 4 loop circuits. The tail end of the innermost edge trace (39) is connected to the signal lead-out terminal (33) of surface A.
5. A planar diaphragm loudspeaker according to claim 1, characterized in that, The circuits of the B-side coil (40) and the A-side coil (30) after being vertically flipped are arranged accordingly. The circuits of the B-side coil (40) and the A-side coil (30) are symmetrically intersected in the overlapping area. The circuits of the B-side coil (40) and the A-side coil (30) are connected in series. The signal input terminal (41) of the B-side coil (40) leads out to the edge loop section (43) of the B-side coil (40). The wire of the edge loop section (43) extends around the B-side signal input terminal (42) and then bends inward in a U-shaped line. The U-shaped line of the edge loop section (43) of the B-side coil (43) is provided with a B-side far-end return section (48) and a B-side near-end return section (49) that match the A-side large loop near-end return section (47) and the A-side large loop far-end return section (46).
6. A planar diaphragm loudspeaker according to claim 5, characterized in that, The B-side edge loop section (43) is provided with a loop circuit that matches the A-side edge loop section (35). The B-side edge loop section (43) loops around the loop circuit 2 to 4 times and then connects to the B-side small loop section (44). The B-side small loop section (44) is provided with a loop circuit that matches the A-side small loop section (34). The tail end of the innermost B-side small loop section (44) is connected to the B-side signal lead-out terminal (42).
7. A planar diaphragm loudspeaker according to claim 1, characterized in that, The A-side coil (30) is provided with a diaphragm ring (19) on the side away from the diaphragm (18). On the side of the diaphragm ring (19) away from the A-side coil (30), an A magnet group (21), an A magnetic sheet (22), and an A bracket (23) are provided outward in sequence. On the outer side of the A bracket (23) away from the A-side coil (30), a circuit board (26) and a tuning mesh (27) are provided.
8. A planar diaphragm loudspeaker according to claim 7, characterized in that, The A-side coil (30) facing the A-side bracket (23) is provided with an A-side signal input terminal (31) and an A-side signal output terminal (32). The A-side bracket (23) is provided with through holes that match the A-side signal input terminal (31) and the A-side signal output terminal (32). The circuit board (26) is provided with a spring guide post (24) on the side close to the A-side bracket (23). The spring guide post (24) passes through the through hole of the A-side bracket (23) and is tightly connected to the A-side signal input terminal (31) and the A-side signal output terminal (32) on the A-side coil (30).
9. A planar diaphragm loudspeaker according to claim 1, characterized in that, A pad (16) is provided on the side of the B-side coil (40) away from the diaphragm (18). On the side of the pad (16) away from the B-side coil (40), a B magnet group (15), a B magnetic sheet (14), a B bracket (13), and a dustproof net (12) are arranged outward in sequence. A shell (11) is provided on the outer side of the dustproof net (12) away from the B-side coil (40). The shell (11) covers the components from the dustproof net (12) to the tuning net (27).