JP2015043549A - Diaphragm for speaker and speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radially woven diaphragm for speaker with a flat frequency characteristic that is inexpensive and lightweight, and a speaker having such a diaphragm for speaker.SOLUTION: A diaphragm for speaker according to the present invention comprises: a woven fabric; and a resin layer impregnating the woven fabric or laminated on the woven fabric. The woven fabric includes: a plurality of warps arranged in a radial state from the center of the woven fabric in an outer peripheral direction; and one or a plurality of woofs arranged in a circumferential direction in an intersecting way with the plurality of warps. The warps are a plurality of yarns with different kinds of physical properties. Those kinds of warps are preferably different from each other in at least one of elastic modulus, average thickness, and specific gravity. The woven fabric preferably includes fan-shaped areas radially separated and categorized in a plurality of categories on the basis of rigidity, or weight by a unit area. The woven fabric preferably includes different kinds of warps for each category of the fan-shaped areas. Additionally, the speaker of the present invention comprises the above mentioned diaphragm for speaker.

Description

  The present invention relates to a speaker diaphragm and a speaker.

  As a diaphragm for a speaker, there is a diaphragm formed by squeezing a plain woven fabric into a conical shape and impregnating and reinforcing it with a resin. In such a speaker diaphragm, since the arrangement of the fibers is not uniform in the radial direction, the sound generated varies depending on the location.

  On the other hand, if a speaker diaphragm is formed by impregnating a woven fabric of radial weave composed of radial warps and wefts in the circumferential direction perpendicular to the warps, vibration transmission characteristics from the center to the periphery Becomes constant in the circumferential direction, so that the sound becomes uniform. However, the diaphragm for a loudspeaker weave has a uniform vibration transmission characteristic in the circumferential direction, so that the vibration pattern has a circumferential shape, and the sound of a specific frequency tends to increase.

  In order to improve such frequency characteristics, a technique for intentionally making the characteristics of the speaker diaphragm uneven in the circumferential direction is known. For example, it has been proposed to adjust a frequency characteristic by providing a portion having a high surface density by dividing a pulp speaker diaphragm into a plurality of fan-shaped sections and increasing the basis weight of some sections. (Japanese Unexamined Patent Publication No. 63-261986).

  However, when this technique is applied to a speaker diaphragm formed by impregnating a woven fabric with a resin, a new papermaking process is required, which disadvantageously increases manufacturing costs. In addition, when such a configuration is adopted, the speaker diaphragm becomes heavier, resulting in a disadvantage that the sound pressure level in the high sound range is lowered.

  In addition, in a resin speaker diaphragm, a speaker diaphragm can be obtained by arranging fiber bands radially inside the resin, or by sticking a fiber band having a mountain-shaped cross section on the surface of the speaker diaphragm. It has been proposed to improve the frequency characteristics by forming a highly rigid radial region (Japanese Utility Model Laid-Open No. 61-9995).

  However, this method requires an additional component such as a fiber band, which increases the manufacturing cost of the speaker diaphragm. In addition, when such a configuration is adopted, the speaker diaphragm becomes heavy, resulting in a disadvantage that the sound pressure level in the high sound range is lowered.

JP-A 63-261986 Japanese Utility Model Publication No. 61-9995

  In view of the above problems, it is an object of the present invention to provide a radiation-woven speaker diaphragm having a flat frequency characteristic, an inexpensive and light weight, and a speaker including such a speaker diaphragm.

  The invention made to solve the above-mentioned problems comprises a woven fabric and a resin layer impregnated or laminated on the woven fabric, and the woven fabric is arranged radially from the center of the woven fabric in the outer peripheral direction. Speaker vibration using a plurality of warp yarns and one or a plurality of weft yarns arranged in the circumferential direction so as to intersect the plurality of warp yarns, and using a plurality of types of yarns having different physical properties as the warp yarns It is a board.

  Since the speaker diaphragm has a plurality of types of warp yarns having different physical properties, the rigidity or the weight per unit area can vary depending on the type of yarn. Accordingly, the speaker diaphragm has a flat frequency characteristic with a small peak because the vibration transmission characteristic in the radial direction is not constant in the circumferential direction and is difficult to resonate. Thus, the speaker diaphragm improves the frequency characteristics simply by changing the type of warp. Therefore, the speaker diaphragm is inexpensive and lightweight because the number of manufacturing steps is the same as the conventional one and the weight does not increase greatly.

  In the speaker diaphragm, it is preferable that at least one of the different types of warp yarns is different in elastic modulus, average thickness, and specific gravity. By selecting such physical properties of the thread, the rigidity or weight per unit area of the speaker diaphragm can be adjusted easily and reliably.

  In the speaker diaphragm, it is preferable that the woven fabric has a fan-shaped region that is radially divided and classified into a plurality according to rigidity or weight per unit area. This makes it possible to cancel each other's peaks by varying the rigidity or the weight per unit area for each classification of the sector regions. Further, the vibration characteristics of the speaker diaphragm can be considered in units of a sector area having a certain size, and therefore the speaker diaphragm is easy to design and can be reduced in price.

  In the speaker diaphragm, the woven fabric may have different types of warp yarns for each of the fan-shaped regions. By changing the type of warp yarn for each fan-shaped region classification, the rigidity or the weight per unit area can be clearly made different, so that the frequency characteristics can be easily predicted at the design stage. Therefore, the design of the speaker diaphragm can be made easier.

  Moreover, another invention made | formed in order to solve the said subject is a speaker provided with the said diaphragm for speakers. Since the speaker diaphragm has a flat frequency characteristic, the speaker can produce a natural sound.

  The speaker diaphragm of the present invention has a radial woven fabric having a plurality of types of warp yarns having different physical properties, so that the vibration transmission characteristic in the radial direction changes in the circumferential direction, so that it is difficult to resonate, the peak is small and flat. Has frequency characteristics. Further, the speaker diaphragm is inexpensive and lightweight because frequency characteristics are improved only by changing the type of warp.

It is typical sectional drawing which shows the diaphragm for speakers of one Embodiment of this invention. It is a typical front view which shows the woven fabric of the diaphragm for speakers of FIG. It is typical sectional drawing which shows a speaker provided with the diaphragm for speakers of FIG. It is a typical front view which shows the woven fabric of the diaphragm for speakers different from FIG. FIG. 5 is a schematic front view showing a speaker diaphragm different from FIGS. 2 and 4. It is a typical front view which shows simply the sector area of the diaphragm for speakers of FIG. FIG. 6 is a schematic front view schematically showing a fan-shaped region of a speaker diaphragm different from FIGS. 2, 4, and 5. FIG. 8 is a schematic front view schematically showing a fan-shaped region of a speaker diaphragm different from FIGS. 2, 4, 5, and 7. It is a graph which shows the frequency characteristic of the sound pressure level of the Example and comparative example of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. First, a speaker diaphragm according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

[First embodiment]

  The speaker diaphragm 1 of FIG. 1 is made of a fiber reinforced resin in which a woven fabric 3 is disposed in a resin layer 2. The speaker diaphragm 1 includes a central cylindrical cylindrical portion 1a, an umbrella-shaped portion 1b that expands from one end of the cylindrical portion 1a to form a conical surface, and an outer periphery of the umbrella-shaped portion 1b. And an annular flange portion 1c extending outward.

  Further, as shown in FIG. 2, the speaker diaphragm 1 has a total of six sector regions S <b> 1 and S <b> 2 that are radially divided and classified into two according to differences in rigidity or weight per unit area. Three fan-shaped regions S1 and S2 are alternately arranged in the circumferential direction. FIG. 2 is a projection view of the speaker diaphragm 1 with respect to a plane parallel to the flange portion 1c.

[Resin layer]
As resin which comprises the resin layer 2, 1 type, or 2 or more types of combinations, such as an acrylic resin, a urethane resin, a melamine resin, a modified rubber resin, a phenol resin, can be used. These resins may contain an additive or the like for realizing desired characteristics.

  The resin layer 2 may be formed using a mold, or may be formed by applying or impregnating a resin to the woven fabric 3 and curing it.

[Woven fabric]
As shown in FIG. 2, the woven fabric 3 is a radially woven fabric, and a plurality of warp yarns 4 that are arranged radially from the center of the woven fabric 3 toward the outer periphery, and the circumferential yarns so as to intersect the warp yarns 4. And one or more wefts 5 arranged in the direction. In the woven fabric 3, there are an inner peripheral edge and an outer peripheral edge arranged concentrically, and the center of the woven cloth 3 can be considered as the center of the inner peripheral edge or the outer peripheral edge. Moreover, when the center of an inner periphery or an outer periphery does not correspond, it is preferable that the warp 4 is arrange | positioned radially from the center of an inner periphery. This is because in radial weaving, weaving is performed while discharging the warp yarn 4 from the inner peripheral edge, but it is difficult to discharge the warp yarn 4 strictly from the center of the inner peripheral edge. That is, in the case of the woven fabric 3 having the inner peripheral edge, if the warp yarns 4 are arranged radially from the inner peripheral edge to the outer peripheral direction, the warp threads 4 radially extend from the center of the woven cloth 3 to the outer peripheral direction. It can be understood that it is arranged. The shape of the inner peripheral edge or the outer peripheral edge is preferably a circle, and may be an ellipse, a rectangle, a polygon, or the like. The woven fabric 3 is preferably a plain weave, that is, a fabric in which warp yarns 4 and weft yarns 5 are alternately displayed, but may be a fabric woven by twill weave or the like.

<Warp yarn>
The warp yarn 4 is composed of two types of yarns 4a and 4b having different physical properties. Specifically, the warp 4 included in one sector region S1 is the first type of yarn 4a, and the warp yarn 4 included in the other sector region S2 is the second type of yarn 4b. The type of warp is different for each area classification. The two types of yarns 4a and 4b having different physical properties are selected so that the elastic modulus, specific gravity, average thickness, and the like are different from each other. In FIG. 2, the thin line represents the first type of thread 4a, and the thick line represents the second type of thread 4b. That is, the thickness of the line in FIG. 2 does not indicate the actual thickness of the yarn.

The two types of yarns 4a and 4b having different physical properties are first warp yarns 4a ₁ and 4b that extend in the radial direction from the inner peripheral edge (inside the cylindrical portion 1a) to the outer peripheral edge (inside the flange portion 1c) of the woven fabric 3, respectively. ₁ , second warps 4a ₂ , 4b ₂ extending radially from the first position close to the inner peripheral edge between the inner peripheral edge and the outer peripheral edge of the woven fabric 3 to the outer peripheral edge, and the inner peripheral edge and the outer periphery of the woven cloth 3 It includes third warps 4a ₃ , 4b ₃ extending radially from the second position outside the first position to the outer peripheral edge with the peripheral edge. Thus, by having the warp yarn 4 from which length differs, the space | interval of warp yarn 4 is settled in the fixed range.

  As the material of the warp 4, carbon fiber, aramid fiber, glass fiber, ceramic fiber, silica fiber, metal fiber, potassium titanate fiber, zirconia fiber, polyacrylate fiber, polyphenylene sulfide fiber, vinylon fiber, rayon fiber, Nylon fiber, polyester fiber, acrylic fiber, polypropylene fiber, polyethylene fiber, cotton fiber, hemp fiber, etc. can be used.

  The warp yarn 4 may be a single fiber, but it is preferable to use a twisted yarn that can easily form the woven fabric 3. As an upper limit of the number of fibers which one warp 4 has, 100 are preferable and 500 are more preferable. On the other hand, the upper limit of the number of fibers that one warp 4 has is preferably 50,000 and more preferably 10,000. When the number of fibers of the warp 4 is less than the lower limit, the thickness of the warp 4 is insufficient due to an increase in the thickness per one of the fibers, and the thickness of the woven fabric 3 may be excessive. Even when the number of fibers of the warp yarn 4 exceeds the upper limit, the thickness of the warp yarn 4 becomes excessive, and the woven fabric 3 may also be thick.

  As a minimum of the thickness of the warp yarn 4, 100 dtex is preferable and 200 dtex is more preferable. On the other hand, the upper limit of the thickness of the warp 4 is preferably 10,000 dtex, and more preferably 5000 dtex. If the thickness of the warp yarn 4 is less than the lower limit, the woven fabric 3 may have insufficient rigidity. Moreover, when the thickness of the warp 4 exceeds the upper limit, the thickness of the woven fabric 3 may be excessive.

  As the two types of yarns 4a and 4b having different physical properties, those having different elastic moduli can be selected. For example, an aramid fiber twisted yarn having a Young's modulus of about 120 GPa can be used as the first type of yarn 4a, and a carbon fiber twisted yarn having a Young's modulus of about 240 GPa can be used as the second type of yarn 4b. . The elastic moduli of these yarns 4a and 4b are reflected as they are in the rigidity of the sector regions S1 and S2.

  Further, as the two types of yarns 4a and 4b having different physical properties, those having different average thicknesses can be selected. For example, an aramid fiber twisted yarn of 420 to 1580 dtex can be used as the first type yarn 4a, and an aramid fiber twisted yarn of 3160 dtex can be used as the second type yarn 4b. When the resin layer 2 is formed by coating, the resin tends to accumulate if the unevenness of the surface of the woven fabric 1 formed by the warp yarn 4 and the weft yarn 5 is large. Therefore, when forming the resin layer 2 by coating, the unevenness | corrugation of the woven fabric 1 surface becomes large and the resin layer 2 becomes thick, so that the warp 4 is thick. Further, when the resin layer 2 is molded, the resin layer 2 is thickened by the amount that the average thickness of the warp yarn 4 is small. As described above, the difference in the average thickness of the yarns 4a and 4b causes a difference in the thickness of the resin layer 2 in each of the sector regions S1 and S2. As a result, the rigidity of the sector regions S1 and S2 or the weight per unit area. There will be a difference.

  Furthermore, as the two types of yarns 4a and 4b having different physical properties, those having different specific gravity can be selected. For example, an aramid fiber twisted yarn having a specific gravity of about 1.6 is used as the first type of yarn 4a, and a vinylon fiber twisted yarn having a specific gravity of about 1.3 is used as the second type of yarn 4b. Can do. Since the specific gravity of these yarns 4a and 4b is different, a difference in weight per unit area is provided between the first sector region S1 and the second sector region S2.

<Weft>
As the weft 5, the same one as the warp 4 can be used. The same yarn as the first type of yarn 4a or the second type of yarn 4b may be used, or a different yarn may be used.

<Advantages>
In the speaker diaphragm 1, since the physical properties of the first type of thread 4 a and the second type of thread 4 b are different, the sector region of the speaker diaphragm 1 including the woven fabric 3 in the resin layer 2. S1 and S2 have different rigidity or weight per unit area. Even if the elastic moduli of the two types of yarns 4a and 4b having different physical properties are the same, a difference in specific gravity and average thickness may cause a difference in the weight of the woven fabric between the sector regions S1 and S2. As a result, a difference occurs in the thickness of the resin layer 2, resulting in a difference in rigidity or weight per unit area between the sector region S 1 and the sector region S 2.

  As described above, the sector regions S1 and S2 have different rigidity or weight per unit area, and therefore have different vibration transmission characteristics in the radial direction. As a result, the speaker diaphragm 1 is less likely to resonate and has a flat frequency characteristic with a small peak. Accordingly, the speaker diaphragm 1 is excellent in sound reproducibility.

  In addition, the speaker diaphragm 1 uses two types of yarns 4a and 4b having different physical properties as the warp yarns 4 and improves the frequency characteristics just by using the woven fabric 3 of the radiation weave as in the conventional case. Can be provided.

  Further, the speaker diaphragm 1 does not add an extra member in order to improve frequency characteristics. For this reason, since the said diaphragm 1 for speakers can be made lightweight, the fall of the sound pressure level of a high sound range is small.

[speaker]
The speaker in FIG. 3 includes the speaker diaphragm 1. Specifically, the speaker is wound around the housing 11, the speaker diaphragm 1 whose outer periphery is fixed to the housing 11, a bobbin 12 fixed to the center back surface side of the speaker diaphragm 1, and the bobbin 12. A voice coil 13, a magnet 14 disposed outside the voice coil 13, and a yoke core 15 and a yoke plate 16 that guide the magnetic flux of the magnet 14 to the voice coil 13. The magnet 14, the yoke core 15 and the yoke plate 16 are integrated and fixed inside the housing 11.

  The speaker moves the speaker diaphragm 1 back and forth (in the horizontal direction in FIG. 3) by the attractive force or exclusion force generated between the magnetic flux generated by passing a current through the voice coil 13 and the magnetic flux of the magnet 14. Sound is generated by letting the air vibrate.

  The speaker is excellent in sound reproducibility because the speaker diaphragm 1 has a flat frequency characteristic.

[Second Embodiment]
Next, a speaker diaphragm according to a second embodiment of the present invention will be described with reference to FIG. In the following embodiments, the same components as those described above are denoted by the same reference numerals, and redundant description is omitted.

  The speaker diaphragm 21 in FIG. 4 is divided into a total of four sector regions S1 and S2, which are classified into two according to the difference in rigidity or weight per unit area. Two first sector regions S1 and two sector regions S2 are alternately arranged. The first sector region S1 and the second sector region S2 both include a first type of yarn 4a and a second type of yarn 4b having different physical properties from the yarn 4a. However, the ratio of the first type yarn 4a and the second type yarn 4b is different between the first sector region S1 and the second sector region S2.

The two types of yarns 4a and 4b having different physical properties are the first warp yarns 4a ₁ and 4b ₁ that extend from the inner peripheral edge to the outer peripheral edge of the woven fabric 3, and the outer peripheral edge from the radial intermediate position of the woven fabric 3, respectively. The second warp yarns 4a ₂ and 4b ₂ are drawn. Further, in FIG. 4, the number of warp yarns 4 and weft yarns 5 is shown to be easy to understand, but the actual woven fabric 3 is the first type as shown in FIG. 4 in each of the sector regions S1 and S2. Since the arrangement patterns of the second thread 4a and the second type of thread 4b are repeated many times, the fan-shaped regions S1 and S2 can be regarded as macroscopically uniform inside.

  As described above, the rigidity or the weight per unit area between the sector area S1 and the second sector area S2 can also be obtained by changing the ratio between the first type yarn 4a and the second type yarn 4b. A difference can be provided. Thus, the frequency characteristics of the speaker diaphragm 21 can be flattened by suppressing the resonance by making the vibration transmission characteristics of the vibration in the circumferential direction of the speaker diaphragm 21 non-uniform.

[Third embodiment]
Next, a speaker diaphragm according to a second embodiment of the present invention will be described with reference to FIGS. 5 and 6.

The speaker diaphragm 31 of FIG. 5 is divided in the circumferential direction into a total of six sector regions S1 and S2 that are classified into two according to the difference in rigidity or weight per unit area. The first sector regions S1 and the second sector regions S2 are alternately arranged three by three. The first sector region S1 includes only the first type of yarn 4a, and the second sector region S2 includes the first type of yarn 4a and the second type of yarn 4b. In the second sector region S2, the second warp yarn 4a ₂ extending radially from the first position close to the inner peripheral edge between the inner peripheral edge and the outer peripheral edge of the woven fabric 3 and the inner part of the woven cloth 3 The third warp thread 4a ₃ extending in the radial direction from the second position outside the first position to the outer peripheral edge between the peripheral edge and the outer peripheral edge is composed of the second type of thread 4b. The first warp extending from the inner periphery to the outer periphery is the warp 4a _{1 made} of the same type of yarn 4a as the first sector region S1.

  Therefore, as shown in a simplified manner in FIG. 6, the second sector region S2 has three sector regions S2a and S2b in which the ratios of the first type yarn 4a and the second type yarn 4b are different in the radial direction. , S2c. Here, in the sector area S2a on the inner peripheral side, the type of the warp yarn 4 is the same as that of the first sector area S1. That is, it is considered that the speaker diaphragm 31 has three types of regions having different thread types or their ratios. The speaker diaphragm 31 has a flat frequency characteristic by such a configuration, and can reproduce sound linearly.

[Fourth embodiment]
Next, a speaker diaphragm according to a fourth embodiment of the present invention will be described with reference to FIG.

  The speaker diaphragm 41 in FIG. 7 is divided in the circumferential direction into a total of eight fan-shaped regions S1 and S2 that are classified into two according to the difference in rigidity or weight per unit area. The first sector region S1 and the second sector region S2 are alternately arranged four by four. Further, the first sector region S1 and the second sector region S2 are different in rigidity or weight per unit area due to different types of warp yarns. In the speaker diaphragm 41, the first sector region S1 has a larger central angle than the second sector region S2.

  The speaker diaphragm 41 has the second sector region S2 having a relatively small area, but the frequency characteristic can be sufficiently flattened even by such a small sector region S2.

[Fifth embodiment]
Next, a speaker diaphragm according to a fifth embodiment of the present invention will be described with reference to FIG.

  The speaker diaphragm 51 in FIG. 8 is divided in the circumferential direction into a total of eight sector regions S1, S2, and S3 that are classified into three according to differences in rigidity or weight per unit area. More specifically, the speaker diaphragm 51 includes four first sector regions S1, two second sector regions S2, and two third sector regions S3, which are adjacent to each other. Between the sector regions S1, the second sector regions S2 and the third sector regions S3 are alternately arranged. Since the sector regions S1, S2, and S3 have different central angles, the arrangement interval in the circumferential direction of the first sector region S1 is not constant.

  Since the speaker diaphragm 51 has fan-shaped regions classified into three according to differences in rigidity or weight per unit area, the frequency characteristics can be flattened in more detail.

[Other Embodiments]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is not limited to the configuration of the embodiment described above, but is shown by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims. The

  Different types of warp of the speaker diaphragm are not limited to elastic modulus, average thickness, and specific gravity. For example, when the resin layer is formed by coating, different warp yarns may be used that have different wettability with respect to the resin applied to the woven fabric. Thus, the difference in the wettability of the warp makes it possible to make a difference in the thickness of the resin coating film. As a result, it is possible to form fan-shaped regions classified into a plurality according to rigidity or weight per unit area.

  The speaker diaphragm may have fan-shaped regions classified into four or more depending on differences in rigidity or weight per unit area. Further, as the warp yarns of the speaker diaphragm, four or more types of yarns having different physical properties may be used. Further, the speaker diaphragm has a fan-shaped region having a different number of types of yarns having different physical properties and having a number of types of rigidity exceeding the number of types of yarns or different weights per unit area. Also good.

  Alternatively, a bowl-shaped speaker diaphragm may be formed by a bowl-shaped woven fabric. Also in this case, warp yarns are arranged from the center of the woven fabric toward the outer circumferential direction. Also, since the voice coil is placed on the back of the speaker diaphragm (opposite to the surface that radiates sound), the speaker diaphragm can be used without problems to form a speaker even without a cylindrical part. it can. In the case of such bowl-shaped woven fabric, since there is no inner peripheral edge, the center of the woven fabric may be considered as the center of the outer peripheral edge. Moreover, when the position where the warp yarn is intentionally discharged is shifted from the center of the outer peripheral edge, the position may be considered as the center of the woven fabric. The shape of the outer peripheral edge of the woven fabric is preferably a circle, and may be an ellipse, a rectangle, a polygon, or the like.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples.

[Example]
In order to verify the effect of the present invention, as an embodiment of the present invention, four first sector regions and four second sector regions are alternately arranged, and the first sector region is a warp and an aramid fiber is used. A speaker having a speaker diaphragm having a second fan-shaped region having warp yarns and carbon fibers was prepared.

[Comparative example]
Further, for comparison with the above example, a speaker including a speaker diaphragm having a conventional configuration in which all warp yarns are aramid fibers was prepared.

  FIG. 9 shows the results of measuring the frequency response of the sound pressure level for the speakers of the examples and comparative examples. As shown in the figure, the speaker of the embodiment has a smaller drop in the sound pressure level in the high sound range of about 1000 Hz or more than the speaker of the comparative example. That is, it was confirmed that the speaker according to the embodiment can output a flat and small distortion sound up to a high sound range.

  The present invention can be widely applied to various speakers because the speaker diaphragm has a flat frequency characteristic and is inexpensive and lightweight.

1, 21, 31, 41, 51 Speaker diaphragm 1a Cylindrical portion 1b Umbrella-shaped portion 1c Flange portion 2 Resin layer 3 Woven cloth 4 Warp yarn 4a First type yarn 4b Second type yarn 5 Weft yarn 11 Housing 12 Cylindrical portion 13 Voice coil 14 Magnet 15 Yoke core 16 Yoke plate S1, S2, S1a, S2b, S2c, S3 Fan-shaped region

Claims (5)

A woven fabric and a resin layer impregnated or laminated on the woven fabric,
The woven fabric has a plurality of warps arranged radially from the center of the woven fabric in the outer peripheral direction, and one or a plurality of wefts arranged in the circumferential direction so as to intersect the plurality of warps.
A speaker diaphragm using a plurality of types of yarns having different physical properties as the warp yarns.   2. The speaker diaphragm according to claim 1, wherein the plurality of different types of warp yarns are different in at least one of elastic modulus, average thickness, and specific gravity.   The speaker diaphragm according to claim 1 or 2, wherein the woven fabric has fan-shaped regions that are radially divided and classified into a plurality according to rigidity or weight per unit area.   The speaker diaphragm according to claim 3, wherein the woven fabric has different types of warp yarns for each of the fan-shaped regions.   A speaker comprising the speaker diaphragm according to any one of claims 1 to 4.

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