WO2023229361A1

WO2023229361A1 - Voice coil plate for flat panel speaker having plurality of line patterns

Info

Publication number: WO2023229361A1
Application number: PCT/KR2023/007050
Authority: WO
Inventors: 김동만
Original assignee: 주식회사 엑추워드
Priority date: 2022-05-25
Filing date: 2023-05-24
Publication date: 2023-11-30
Also published as: KR20230164525A

Abstract

The present invention relates to a voice coil plate for a flat panel speaker and, more specifically, to a voice coil plate having a track coil of a plurality of active lines and a plurality of inactive lines. The voice coil plate for a flat panel speaker having a plurality of line patterns according to the present invention comprises: an idle track line in which a pattern-printed coil consists of n single lines (n being a positive integer of 2 or more); and an effective track line in which the pattern-printed coil consists of n plural lines, wherein the pattern-printed coil can form track lines that converge inward by repeating the process in which the n single lines are expanded into the n plural lines, and the n plural lines are reduced to the n single lines, and then expanded into the n plural lines.

Description

Voice coil plate with multiple line patterns for flat panel speakers

The present invention relates to a voice coil plate for a flat speaker, and more specifically, to a voice coil plate having a track coil of a plurality of active lines and a plurality of invalid lines.

The movable coil plate used in a flat speaker is formed by winding it in an oval shape or printing a pattern on one side or both sides of a plate-shaped coil base.

The movable coil plate generates a magnetic field that expands and contracts at the same frequency as the audio signal around the movable coil when current flows through the movable coil. The movable coil responds to the magnetic field generated by the magnet in the speaker unit. Because it is hanging, the movable coil plate moves up and down while interacting with the magnetic field generated from the movable coil in response to this magnetic field, and since the movable coil plate is connected to the diaphragm of the speaker unit, the diaphragm moves up and down and pushes out the air. Sound is generated by vibration.

These flat speakers are being developed to have increasingly thinner and longer structures along with an increase in output capacity. Furthermore, in order to increase the output capacity of flat speakers, the development of flat speakers with a structure that combines multiple magnetic circuits is also underway. It is emerging as an important issue.

However, in the case of a movable coil film laminated in multiple layers, the number of windings must be increased as much as possible to increase the induced electromotive force, but as the number of turns increases, the resistance value increases, making it inefficient. Conversely, if the resistance value is preset, the winding number must be increased as much as possible. Since the number of players cannot be increased, the induced electromotive force cannot be increased, and as a result, it is difficult to implement a high-output speaker.

Republic of Korea Patent Publication No. 10-1147904 discloses 'a flat speaker with a multi-layer PCB pattern movable coil film'.

This is implemented to increase the induced electromotive force through impedance control of the multi-layer movable coil film, but only a multi-layer structure of 4 or more layers is possible, and the magnetic field of the movable coil plate due to the multi-layer structure is 90 degrees different from the positive direction. It is difficult to improve the disadvantages of unnecessary left and right lateral vibration force and increased weight due to current flow in the left and right track lines, and it is derived by reducing the number of lines in the idle track on the side of the moving coil and increasing the number of lines in the effective straight track. It is difficult to maximize electromotive force, and it is impossible to implement a flat speaker with dual PCB pattern moving coils at the same time.

The flat panel speaker disclosed in No. 10-2114439, filed and registered by the present applicant, has a multi-pattern structure that allows impedance management while increasing the inductance, but impedance management is achieved by further increasing the length of the coil within a standardized (predetermined) area. Improvement of possible multi-pattern structures is needed.

[Prior art literature]

[Patent Document]

(Patent Document 1) Republic of Korea Patent Publication 10-1147904

(Patent Document 2) Republic of Korea Patent Publication 10-2114439

The present invention was developed to solve the above-mentioned problems. In order to increase the maximum induced electromotive force, the induced electromotive force can be significantly increased by maximizing the number of coil turns (turn number) of the PCB pattern movable coil film laminated as a multi layer. I would like to propose a flat panel speaker with

In addition, by increasing both the number of lines of the idle track and the number of lines of the effective straight track, the number of lines of the effective straight track is further increased compared to the number of lines of the idle track to secure sufficient inductance and control the overall impedance. We would like to provide a voice coil plate that can do this.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below. will be.

In order to achieve the above object, the voice coil plate having a plurality of line patterns for a flat speaker according to the present invention has an idle track in which the pattern-printed coil consists of n single lines (n is a positive integer of 2 or more). It includes an effective track line consisting of a line and n plural lines, wherein the pattern printed coil has n single lines expanded into n plural lines, the n plural lines reduced into n single lines, and then n again. By repeating expansion into multiple lines, a track line that converges inward can be formed.

Here, the voice coil plate may have a via hole at least one of the inner end or the outer end of the track.

Here, the voice coil plate has a structure in which a plurality of voice coil plates are stacked, and the coils of each layer of the voice coil plate may be connected in series or in parallel.

Here, the voice coil plate is laminated in an even number of layers of 4 or more, the voice coil plate has an inner via hole formed at the inner end of the coil, and the remaining layers except the first layer and the outermost layer of the voice coil plate have an outer layer of the coil. An outer via hole is formed at the end, the odd-numbered layer and each of the even-numbered layers adjacent thereto are connected to each other through the inner via hole, and the even-numbered layer and each of the odd-numbered layers adjacent thereto are connected to each other through the outer via hole, so that the coil Can be connected in series.

Here, the voice coil plate is laminated in four or more even layers, an inner via hole is formed at an inner end of the voice coil plate, and a terminal is formed at an outer end of the odd layer coil of the voice coil plate, A terminal is formed at the other outer end of the coil of the even-numbered layer, the odd-numbered layer and each of the even-numbered layers adjacent thereto are connected to each other through the inner via hole, the terminals of the odd-numbered layer are shorted to each other, and the even-numbered layer The terminals are shorted to each other so that the coils can be connected in parallel.

According to the configuration of the present invention described above, in order to increase the maximum induced electromotive force, a flat speaker is provided that can significantly increase the induced electromotive force by maximizing the number of coil turns (number of turns) of the PCB pattern movable coil film laminated as a multi layer. can do.

In addition, by increasing both the number of lines of the idle track and the number of lines of the effective straight track, the number of lines of the effective straight track is further increased compared to the number of lines of the idle track to secure sufficient inductance and control the overall impedance. We can provide a voice coil plate that can do this.

However, the effects of the present invention are not limited to the above effects, and may be expanded in various ways without departing from the spirit and scope of the present invention.

1 is a schematic perspective view of a flat panel speaker including a voice coil plate with a plurality of line patterns for a flat panel speaker according to the present invention.

Figure 2 is a plan schematic diagram of a flat panel speaker equipped with a voice coil plate having a plurality of line patterns for a flat panel speaker according to the present invention.

Figure 3 is a coil pattern structure diagram of a voice coil plate having a plurality of line patterns for a flat speaker according to the present invention.

Figure 4 is a structural diagram of a series connection structure in which voice coil plates having a plurality of line patterns for a flat speaker according to an embodiment of the present invention are stacked in four layers.

Figure 5 is a diagram illustrating a parallel connection structure in which voice coil plates having a plurality of line patterns for a flat speaker according to another embodiment of the present invention are stacked in four layers.

Figure 6 is a structural diagram of a six-layer series connection of voice coil plates having a plurality of line patterns for a flat speaker according to another embodiment of the present invention.

Figure 7 is a diagram illustrating a parallel connection structure in which voice coil plates having a plurality of line patterns for a flat speaker according to another embodiment of the present invention are stacked in six layers.

Hereinafter, the structure and operational effects of a voice coil plate having a plurality of line patterns for a flat speaker according to the present invention will be examined with reference to the attached drawings.

The detailed description of specific embodiments shown in the accompanying drawings is to be read in conjunction with the accompanying drawings, which are regarded as part of the overall description of the invention. References to direction or orientation are only for convenience of explanation and are not intended to limit the scope of the present invention in any way.

Specifically, terms indicating position such as "below, above, horizontal, vertical, top, bottom, upward, downward, upper, lower," or their derivatives (e.g., "horizontally, downward, upward") etc.) should be understood with reference to both the drawings being explained and the related description. In particular, these relative terms are only for convenience of explanation and do not require that the device of the present invention be configured or operated in a specific direction.

In addition, terms indicating the interconnection relationship between components, such as "mounted, attached, connected, connected, interconnected," refer to the state in which individual components are directly or indirectly attached, connected, or fixed, unless otherwise specified. It can mean, and this should be understood as a term that encompasses not only a movably attached, connected, or fixed state, but also an immovable state.

When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

1 is a schematic perspective view of a flat speaker having a voice coil plate with a plurality of line patterns for a flat speaker according to the present invention, and FIG. 2 is a schematic perspective view of a voice coil plate with a plurality of line patterns for a flat speaker according to the present invention. This is a plan schematic diagram of a flat panel speaker.

The flat speaker to which the voice coil plate of the present invention is applied is shown in Figures 1 and 2, where the damper, lead wire, base frame, diaphragm, etc. that add vibration to the moving coil are omitted.

The flat speaker includes a movable coil plate 10 and a pair of opposing

magnetic bodies

11a and 11b spaced at a predetermined distance d, and a voice coil plate (located between the pair of

magnetic bodies

11a and 11b). 10) Includes.

A pair of facing magnetic bodies (11a, 11b) may each have the same configuration, and the magnets (12a, 12b), the upper magnet plates (13a, 13b) located on the upper surfaces of the magnets (12a, 12b), and the magnet It may be composed of lower magnet plates (14a, 14b) located on the lower surfaces of (12a, 12b).

The magnets (12a, 12b) provided in the opposing magnetic bodies (11a, 11b) have opposite polarities so that attractive forces can act on each other, and the movable coil plate (10) receives the same force from the magnetic bodies (11a, 11b) on both sides. It is desirable to maintain the same distance (d) so that it can receive magnetic force.

The speaker configured in this way is mounted inside the base frame (not shown), and a diaphragm (not shown) may be formed on the top of the voice coil plate 10 to transmit vibration energy.

Each of the

upper magnet plates

13a and 13b and the

lower magnet plates

14a and 14b may be formed as a single, non-separated plate.

The upper magnet plates (13a, 13b) and lower magnet plates (14a, 14b) are formed integrally with the magnet and can prevent inward bending due to the tensile force of the N and S poles.

In the present invention, when placing a magnet, which is one of the most important parts of a flat speaker, on the left and right sides of the movable coil plate, considering that unnecessary track portions on the left and right are maintained, thereby maintaining the inefficiency of left and right vibration force generation, the length of the magnet is adjusted. By placing it only on the straight track of the moving coil, it can have the effect of drastically lowering the cost by eliminating inefficiency and reducing the length of the magnet.

The voice coil plate 10 may be composed of multi-layers stacked in an even number of layers (4, 6, 8, ...) of four or more layers, and the specific coil tracks and patterns of the voice coil plate 10 are described again below. I decided to do it.

The coil of the voice coil plate 10 may be printed in a pattern on a printed circuit board (PCB).

Referring to FIG. 3, (A) shows an example of a voice coil plate 20a, and (B) shows another example of a voice coil plate 20b.

(A) and (B) have the same track structure and coil line configuration, but only inner and outer via holes for connecting the coils of the voice coil plates in series and parallel in a multi-coil plate in which a plurality of voice coil plates are stacked. This is to explain the differences in the location of the via hole and the presence or absence of the via hole.

(A) may be a structure of an odd-layer voice coil plate 20a, and (B) may be a structure of an even-layer voice coil plate 20b.

The voice coil plate 20a of (A) has a structure in which internal via

holes

22a and 22b can be formed for electrical connection with the voice coil plate of another adjacent layer, and the voice coil plate 20b of (B) has one A structure in which inner via holes (22c, 22d) are formed for electrical connection with the voice coil plate of an adjacent layer, and outer via holes (23a, 23b) are formed for electrical connection with the voice coil plate of another adjacent layer. shows.

The coils 21 of the

voice coil plates

20a and 20b according to the present invention may be pattern-printed in the form of a track.

The coil 21 of the track structure can be divided into an idle track line and an effective track line. In the drawing, the vertical line may correspond to the idle track line, and the horizontal line may correspond to the effective track line. .

It is important for speakers to maximize output efficiency by improving the induced electromotive force of the up and down vibration of the voice coil plate.

In general, in a track-type coil structure, the direction of the current that is 90 degrees different from the direction of the magnetic field does not affect the vertical vibration of the movable driver, but rather generates a force to vibrate in the left and right directions, so the number of lines in this part is minimized. It can contribute to improving sound pressure by suppressing unnecessary lateral vibration forces and reducing weight by minimizing the coil line of the ideal coil track, and maximizing the number of line turns in the horizontal line coil portion, which is a straight effective track line where current flows in the positive direction of the magnetic field. can do.

The coil 21 of the

voice coil plates

20a and 20b according to the present invention has an idle track line 21a formed of n single lines (n is a positive integer of 2 or more), and an effective track line ( 21b) may be formed of n plural lines.

Referring to (A), the incoming line connected to the external power connection terminal 23 is a vertical line and is an idle track line 21a, and is composed of two lines, and each of the two lines is patterned as a single line. Can be printed.

The idle track line (21a) is bent at 90 degrees and turned into a horizontal line, and each of these horizontal lines is extended into two plural lines of effective track lines (21b), and then turned at 90 degrees and each is reduced to a single line. You will have

For electrical connection with an adjacent voice coil plate, via holes may be formed inside or outside, or inside or outside.

In general, in the case of multi-layer pattern printed PCB voice coils for flat speakers, when manufactured using an etching microprocess of less than 100 microns (㎛) to maximize the “L” value (total coil length), the desired impedance is achieved. There are many difficulties in producing it accordingly.

Current PCB microprocessing is usually capable of mass production up to 60 microns (㎛), but since maximizing “L” value and impedance control are conflicting concepts, groundbreaking technological innovation is needed.

The reason is that in order to increase the “L” value (total length of the coil) when printing a pattern on a track with a single line of microprocessing on a PCB, the total length of the track line pattern printed with a very small wire diameter is significantly increased. There is a problem that the impedance of one layer exceeds 100 ohms, and when it is connected in series to a neighboring layer through a via hole, the impedance rises to 200 ohms.

In addition, in order to obtain the desired impedance while maximizing the “L” value (total coil length), it is necessary to form parallel multiple lines to avoid a significant increase in impedance while maximizing the total length of the track within the PCB track. .

In the present invention, a one-layer PCB printed circuit track is provided with n primary single lines, and each n single line is extended to n plural lines in the track (effective track line) in the forward direction of the magnetic field pattern printed on the PCB. , Tracks (these track lines) that do not match the direction of the magnetic field are connected to a single line, and then expanded into n multiple lines in the forward direction of the magnetic field, thereby forming a track by repeatedly crossing them.

The voice coil of the present invention formed in this way forms n inlet lines and outlet lines, and as each of the n single lines expands into n plural lines, each line has the effect of being connected in parallel on the first floor. Impedance management is possible even when applying fine processes of less than 100 microns (㎛).

In addition, even when the “L” value (total length of the coil) is sufficiently increased through microprocessing of less than 100 microns (㎛) and a multi-layer structure, the impedance of the first layer can be controlled, resulting in a pattern-printed product with an entire multi-layer structure. Impedance of the PCB voice coil can be controlled most efficiently.

On the other hand, for example, if the coil impedance of the first-layer voice coil plate is too small, that is, the PCB size is limited, in order to increase the L value while allowing a large amount of current to flow for high output, the width and thickness of the PCB pattern printing line are required. must be increased, but in this case, there is a possibility that the impedance may be too low compared to the design value.

In this way, if the impedance exceeds the design value and is too small, it can be solved by connecting a plurality of stacked voice coil plates in series.

The series and parallel connection structures of a plurality of voice coil plates stacked according to the coil structure of the voice coil plate according to the present invention described above will be described with reference to FIGS. 4 to 7.

Figure 4 is a serial connection structure diagram in which voice coil plates having a plurality of line patterns for a flat speaker according to an embodiment of the present invention are stacked in four layers, and Figure 5 is a diagram showing a plurality of lines for a flat speaker according to another embodiment of the present invention. This is a parallel connection structure in which voice coil plates with a pattern are stacked in four layers.

As shown in Figures 4 and 5, the voice coil plate having a plurality of line patterns for a flat panel speaker according to an embodiment of the present invention is preferably applied to a flat panel speaker composed of an even number of layers of four or more layers.

As described above, a laminated structure of four or more layers is required to control impedance while increasing the inductance value through multiple line patterns and parallel connection of each layer, while the thickness of the coil pattern must be increased to increase the amount of current for high output. If designed large, a laminated structure of two or more layers may be possible if serial connection between each layer is necessary to control the impedance value below the design value.

Referring to FIG. 4, the serial connection structure between each layer of the voice coil plate having a 4-layer laminated structure can be seen.

From the input terminal 113, an idle track line 111a consisting of n single lines is extended to an effective track line 111b consisting of n plural lines.

Unlike PCB coils with conventional pattern-printed tracks, one layer of pattern-printed PCB forms n primary single lines, and each primary n single line is the effective direction of the pattern-printed PCB in the forward direction of the magnetic field. In the track, it expands to a secondary n plural lines (2 lines or more), and then a single line is formed in the vertical pattern printing track that does not match the direction of the magnetic field, and then it is connected. The effective track of the PCB with the pattern printed in the forward direction of the magnetic field. The expansion into n plural lines can be repeated alternately to form a track line that converges inward.

The track lines converging on the inside of the first-layer voice coil plate 101 form via holes (121a, 121b) identical to the first n lines, and the adjacent layer (2) through the inner via holes (121a, 121b) They are connected in series through the via holes (121c, 121d) of the layer voice coil plate (102), and the pattern-printed tracks of adjacent layers repeat and intersect outward in the same way as the tracks of the pattern-printed PCB applied in the first layer. It can be twisted.

The PCB track of the outwardly wound 2-layer voice coil plate 102 is connected in series with the via

holes

131c and 131d of the neighboring 3-layer voice coil plate 103 through the n number of via

holes

131a and 131b on the outside, The line of the serially connected pattern printing track can converge inward as the secondary n multiple lines and single lines repeatedly intersect, as in the previous layer.

The PCB Track Line converging on the inside of the 3-layer voice coil plate 103 is in series with each other through the via holes (121e, 121f) already formed on the inside and the via holes (121g, 121h) formed on the inside of the 4-layer voice coil plate 104. After being connected, the coil of the 4-layer voice coil plate 104 may be wound outward again in the same manner as the 2-layer voice coil plate 102.

The coil of the 4th-layer voice coil plate (104) is wound from the inside to the outside in the same manner as the 2nd-layer voice coil plate (102), and copper foil (115, output terminal) for soldering the external connection lead wire is attached to the end of the PCB track. It can be formed and completed.

Referring to FIG. 5, the parallel connection structure between each layer of the voice coil plate having a 4-layer laminated structure can be seen.

From the input terminal 213, an idle track line consisting of n single lines is extended to an effective track line consisting of n plural lines.

One layer of pattern printed PCB forms n primary n single lines, and each n primary single line is connected to n secondary multiple lines (more than 2 lines) in the effective track of the pattern printed PCB in the forward direction of the magnetic field. A single line is formed in the vertical pattern-printed track that is expanded and does not match the direction of the magnetic field, and then expanded to n multiple lines in the effective track of the pattern-printed PCB in the forward direction of the connected magnetic field. A track line that converges can be formed.

The track line converging inside the first-layer voice coil plate 201 has via holes (221a, 221b) identical to the first n lines, and is connected to the adjacent layer (second-layer voice coil) through the inner via holes (221a, 221b). They can be connected in series through the via

holes

221c and 221d of the plate 202.

Likewise, they can be connected in series to each other through the via

holes

221e and 221f of the 3-story voice coil plate 203 and the via holes 221g and 221h of the 4-story voice coil plate 204.

Here, when the pair in which the first and second floor voice coil plates (201, 202) are connected in series is called A, and the pair in which the third and fourth floor voice coil plates (203, 204) are connected in series is called B, the first floor voice Connect the terminal 213 of the coil plate 201 and the terminal 213 of the 3rd floor voice coil plate 203, respectively, and connect the terminal 215 of the 2nd floor voice coil plate 202 and the terminal 213 of the 4th floor voice coil plate 204. ) can be connected to each terminal 215 to connect the coils of the entire voice coil plate in parallel.

Here, depending on the impedance of the voice coil plate 201 on the first floor, the impredance is doubled when the first and second floors are connected in series. The two layers are printed with a pattern of n single lines on the first layer and n multiple lines on the second layer. Once the impedance of the PCB coil plates connected in series is obtained, the desired impedance can be obtained by parallelizing all A and B.

Figure 6 is a serial connection structure diagram in which voice coil plates having a plurality of line patterns for a flat speaker according to another embodiment of the present invention are stacked in six layers, and Figure 7 is a diagram showing a plurality of lines for a flat speaker according to another embodiment of the present invention. This is a parallel connection structure in which voice coil plates with a pattern are stacked in six layers.

Figures 6 and 7 show a series-parallel connection structure in which six layers of voice coil plates (301 to 306, 401 to 406) are stacked, and the four-layer voice coil plates of Figures 4 and 5 are stacked. It is connected in the same way as the series-parallel connection structure of , and there is nothing else other than the addition of a two-layer voice coil plate.

Figures 6 and 7 show an example of a six-layer voice coil plate, and in addition, the stacked structure of even-numbered layers (8, 10, 12, ...) can be used in any number of identical coil patterns and series-parallel connection methods. formation is possible.

Referring to FIG. 6, the idle track line 311a made of n single lines from the input terminal 313 extends to the effective track line 311b made of n multiple lines, and again, a vertical track line 311a that does not match the direction of the magnetic field is extended. In the pattern printing track, a single line is formed, and then in the forward direction of the connected magnetic field, the effective track of the pattern-printed PCB is expanded into n multiple lines again, and this can be repeated to form a track line that converges inward.

Inside via holes (321a, 321b, 321e, 321f, 321i, 321j) of each of the odd-layer voice coil plates (301, 303, 305) and via holes (321c, 321d, 321g) of the even-layer voice coil plates (302, 304, 306) , 321h, 321k, 321l), and the pattern-printed tracks of adjacent layers can be wound outward while repeating and crossing in the same way as the tracks of the pattern-printed PCB applied in the first layer.

Referring to Figure 7, the first and second floor voice coil plates (401, 402) are connected in series through the inner via holes (421a, 421b, 421c, 421d), and the third and fourth floor voice coil plates (403, 404) ) are connected in series through the inner via holes (421e, 421f, 421g, 421h), and the 5th and 6th floor voice coil plates (405, 406) are connected in series through the inner via holes (421i, 421j, 421k, 421l). do.

Short the terminal 413 of the 1st floor voice coil plate 401, the terminal 413 of the 3rd floor voice coil plate 403, and the terminal 413 of the 5th floor voice coil plate 405, 2 The terminal 215 of the 4-layer voice coil plate 402, the terminal 215 of the 4-layer voice coil plate 404, and the terminal 215 of the 6-layer voice coil plate 406 are shorted to disconnect the coils of all voice coil plates. can be connected in parallel.

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the above description has been made focusing on the examples, this is only an example and does not limit the present invention, and those skilled in the art will understand the above examples without departing from the essential characteristics of the present embodiment. You will be able to see that various modifications and applications are possible. For example, each component specifically shown in the examples can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

[Explanation of symbols]

10:

voice coil plate

11a, 11b: magnetic body

12a, 12b:

Magnet

13a, 13b: Upper magnet plate

Claims

The pattern-printed coil includes an idle track line consisting of n single lines (n is a positive integer of 2 or more) and an effective track line consisting of n plural lines,

The pattern-printed coil repeats the process of expanding n single lines into n multiple lines, reducing the n multiple lines into n single lines, and then expanding into n multiple lines, so that the track lines converge inward. A voice coil plate having a plurality of line patterns for a flat speaker, forming a.
According to paragraph 1,

The voice coil plate is a voice coil plate having a plurality of line patterns for a flat speaker, and having a via hole in at least one location on the inner end or the outer end of the track.
According to paragraph 1,

The voice coil plate has a structure in which multiple pieces are stacked,

A voice coil plate having a plurality of line patterns for a flat panel speaker, wherein the coils of the voice coil plate of each layer are connected in series or in parallel.
According to paragraph 1,

The voice coil plate is laminated in an even number of layers of 4 or more,

The voice coil plate has an inner via hole formed at the inner end of the coil,

An outer via hole is formed at the outer end of the coil in the remaining layers except the first layer and the outermost layer of the voice coil plate,

Each of the odd-numbered layers and the even-numbered layers adjacent thereto are connected to each other through the inner via hole, and the even-numbered layer and each of the odd-numbered layers adjacent thereto are connected to each other through the outer via hole so that the coils are connected in series. A voice coil plate with a line pattern of
According to paragraph 1,

The voice coil plate is laminated in an even number of layers of 4 or more,

The voice coil plate has an inner via hole formed at the inner end of the coil,

A terminal is formed on one outer end of the coil of the odd-numbered layer of the voice coil plate, and a terminal is formed on the other outer end of the coil of the even-numbered layer,

The odd layer and each of the even layers adjacent thereto are connected to each other through the inner via hole, terminals of the odd layer are shorted to each other, and terminals of the even layer are shorted to each other to connect the coils in parallel. A voice coil plate with multiple line patterns for a speaker.