Speaker diaphragm and speaker equipped with said speaker diaphragm

Abstract

To provide a speaker diaphragm capable of reproducing a clear tone color up to a high range at a low cost.SOLUTION: A speaker diaphragm W1 made of cone paper made of a pulp material includes a body portion 10 having front and back surfaces that vibrate and generate sound, and a surround edge portion 20 attached to the outer peripheral side of the body portion 10, and the body portion 10 has an uneven honeycomb pattern 12 formed on the back surface 10b. Further, the honeycomb pattern 12 is constituted by a core portion 12a recessed in a hexagonal shape in plan view and a honeycomb rib portion 12b protruding to the outer peripheral portion of the core portion 12a, and the pulp fiber density of the core portion 12a is lower than the pulp fiber density of the honeycomb rib portion 12b.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a speaker diaphragm and a speaker including the speaker diaphragm. [Background technology]

[0002] Conventionally, a speaker diaphragm that has been widely used has a three-layer structure in which thin skin layers 401 are bonded to both sides of a honeycomb-shaped core material (honeycomb core) 402, as shown in Fig. 8. This speaker diaphragm 400 has a core material (honeycomb core) 403 that is mainly made of "aluminum", and thin skin layers 401 that are made of materials such as "carbon fiber (CFRP), glass fiber (GFRP), aramid fiber (AFRP)", etc.

[0003] The three-layered speaker diaphragm 400 as shown in the figure is disclosed in, for example, Patent Document 1 and Non-Patent Document 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 59-28798 [Non-Patent Document 1] Tamon Saeki, editor, "Speaker & Enclosure Encyclopedia", 60 pages, published in 1999, Seibundo Shinkosha DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0005] The speaker diaphragm 400 of the above-mentioned conventional technology is manufactured by forming a honeycomb core 402 mainly from aluminum, and bonding skin layers 402 made of carbon fiber (CFRP) or the like to both sides of the honeycomb core 402, which is costly and has the problem that it is difficult to reproduce high-pitched sounds due to its large weight. The three-layered speaker diaphragm 400 is mainly used for low and mid-range sounds.

[0006] The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a speaker diaphragm and a speaker that are low-cost and capable of reproducing clear tones up to high frequencies. [Means for solving the problem]

[0007] The present invention for solving the above problems provides a speaker diaphragm made of a cone paper formed of a pulp material, the speaker diaphragm having a body portion having a front and back surface that vibrates to generate sound, and a surround edge portion attached to the outer peripheral side of the body portion, the body portion having a concave-convex honeycomb pattern formed on one or both of the front and back surfaces. The honeycomb pattern is formed by a core portion recessed in a hexagonal shape in a plan view and a honeycomb rib portion protruding from the outer periphery of the core portion, and the density of the pulp fibers in the core portion is lower than the density of the pulp fibers in the honeycomb rib portion. It is characterized by the fact that

[0008] In this way, the speaker diaphragm of the present invention is made of a cone paper made of pulp material, and an uneven honeycomb pattern is provided on one or both of the front and back surfaces. In other words, since the speaker diaphragm of the present invention is made of a thin and light cone paper, it can reproduce sounds up to a high frequency range. In addition, since the material of the present invention is a cheap pulp material, and the manufacturing process is the same as the manufacturing process of the speaker diaphragm of the paper cone of the conventional technology, it is possible to reduce the cost of the speaker. In addition, the speaker diaphragm of the present invention is made of thin and light cone paper, but has increased rigidity due to the uneven honeycomb pattern. Compared to speaker diaphragms made of well-known cone paper, the speaker diaphragm of the present invention has increased rigidity, which suppresses split resonance during vibration, reduces distortion, and allows the reproduction of clear, flat tones up to high frequencies. Furthermore, according to the configuration of the present invention, it is possible to provide a speaker diaphragm that can be used for speakers ranging from large diameter to small diameter.

[0010] In this way, in the present invention, the density of the pulp fibers in the core of the honeycomb pattern is lower than the density of the pulp fibers in the honeycomb rib. In other words, in the present invention, the core of the honeycomb pattern has an appropriate internal loss, while the rigidity of the honeycomb rib is increased. With this configuration, the present invention can suppress mid-range components that cause muffled sound, providing dynamic, rich bass and clear, distinct sound.

[0011] Moreover, the surround edge portion is formed in an annular shape when viewed from above, and has an edge roll portion that is recessed in an approximately arc shape at approximately the radial center, a plate-shaped inner flange piece extending radially inward from the inner end of the edge roll portion, and a plate-shaped outer flange piece extending radially outward from the outer end of the edge roll portion, and further, it is desirable that the inner flange piece of the surround edge portion is attached at a position a predetermined dimension inward from the outer end of the body portion, and that a portion of the edge roll portion is arranged to overlap a portion of the outer portion of the body portion in the radial direction. It is preferable that the body portion is formed in any one of a cone shape, a flat plate shape, and a parabolic shape. The present invention also provides a speaker diaphragm made of a cone paper formed of a pulp material, the speaker diaphragm having a body portion having a front and back surface that vibrates to generate sound, and a surround edge portion attached to the outer peripheral side of the body portion, the body portion having an uneven honeycomb pattern formed on one or both of the front and back surfaces, the surround edge portion being formed in an annular shape in a plan view, and having an edge roll portion recessed in an approximately arc shape at an approximately central portion in the radial direction, a plate-shaped inner flange piece extending radially inward from an inner end portion of the edge roll portion, and a surround edge portion extending radially inward from an inner end portion of the edge roll portion. and a plate-shaped outer flange piece extending radially outward from the outer end of the giroll portion, and further, the inner flange piece of the surround edge portion is attached to a position inside the outer end of the body portion by a predetermined dimension, a part of the edge roll portion is disposed so as to overlap a part of the outer part of the body portion in the radial direction, and the body portion is formed with a folded portion folded downward from the outer end, and a free end of the folded portion has the same height dimension as an upper surface of the outer flange piece of the surround edge portion. .

[0012] This configuration was adopted for the following reasons. The conventional speaker diaphragm has a configuration in which the entire edge roll portion of the surround edge protrudes radially outward from the outer end of the body portion. Therefore, the outer diameter of the conventional speaker diaphragm is the sum of the outer diameter of the body portion, the edge roll portion of the surround edge portion, and the radial dimension of the outer flange piece extending from the outer end of the edge roll portion. The outer diameter of the speaker diaphragm is limited by its mounting position and application, and therefore the outer diameter of the body portion that vibrates to generate sound is also limited. On the other hand, in the present invention, as described above, the inner flange piece of the surround edge portion is attached to a position a predetermined dimension inward from the outer end of the body portion, and a part of the edge roll portion is arranged to overlap a part of the outer part of the body portion in the radial direction. Therefore, according to the present invention, the radial dimension of the body portion that vibrates to generate sound can be made larger than that of the speaker diaphragm of the prior art. As a result, in the present invention, the radial dimension of the body portion can be increased without increasing the outer diameter of the speaker diaphragm itself, thereby making it possible to widen the directivity and increase the sound pressure compared to a "speaker diaphragm of the same outer diameter" of the prior art.

[0013] The present invention is also characterized in that it is a speaker including the above-mentioned speaker diaphragm. Thus, according to the present invention, it is possible to provide a speaker capable of reproducing clear tones up to high frequencies at low cost. Effect of the Invention

[0014] According to the present invention, it is possible to provide a speaker diaphragm capable of reproducing clear tones up to high frequencies at low cost. Also, according to the present invention, it is possible to provide a speaker including the above-mentioned speaker diaphragm. [Brief description of the drawings]

[0015] [Figure 1] 1A is a schematic diagram showing a speaker diaphragm of an embodiment of the present invention, where (a) is a schematic diagram showing the planar surface of the speaker diaphragm, and (b) is a schematic diagram showing the bottom surface, which is the rear surface of the speaker diaphragm. [Diagram 2] FIG. 2 is a schematic diagram showing a cross section taken along line AA in FIG. [Diagram 3] 5A and 5B are schematic diagrams for explaining a honeycomb pattern formed on a body portion of a speaker diaphragm according to an embodiment of the present invention. [Figure 4] 3 is a schematic diagram for explaining the arrangement of a body portion and a surround edge portion of a speaker diaphragm according to an embodiment of the present invention. FIG. [Diagram 5] 1 is a schematic diagram showing a configuration of a speaker including a speaker diaphragm according to an embodiment of the present invention; [Figure 6] 1A and 1B are schematic diagrams for explaining modified examples of a speaker diaphragm of an embodiment of the present invention, in which (a) is a schematic diagram showing the speaker diaphragm of the embodiment shown for comparison, (b) is a schematic diagram showing a first modified example of the speaker diaphragm, and (c) is a schematic diagram showing a second modified example of the speaker diaphragm. [Figure 7] 1A is a schematic diagram of a speaker diaphragm of the prior art shown for comparison to explain the configuration of a speaker diaphragm of an embodiment of the present invention, where (a) is a schematic diagram showing the front surface of the speaker diaphragm of the prior art, (b) is a schematic diagram showing a cross-section of the speaker diaphragm of the prior art, and (c) is a schematic diagram showing the back surface of the speaker diaphragm of the prior art. [Figure 8] FIG. 1 is a schematic diagram showing a cross section of a three-layered speaker diaphragm according to the prior art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker diaphragm and a speaker according to an embodiment of the present invention will now be described with reference to the drawings.

[0017] First, the speaker diaphragm of this embodiment will be described with reference to Figs. 1 to 4. Fig. 1 is a schematic diagram showing the speaker diaphragm of this embodiment, where (a) is a schematic diagram showing the planar surface of the speaker diaphragm, and (b) is a schematic diagram showing the bottom surface of the speaker diaphragm. Fig. 2 is a schematic diagram showing the AA cross section of Fig. 1(a). Fig. 3 is a schematic diagram for explaining the honeycomb pattern formed on the body part of the speaker diaphragm of this embodiment. Fig. 4 is a schematic diagram for explaining the arrangement of the body part and the surround edge part of the speaker diaphragm of this embodiment.

[0018] The speaker diaphragm W1 of this embodiment is made of a cone paper made of pulp material. Specifically, the speaker diaphragm W1 has a body part 10 with a front and back surface (front surface 10a, back surface 10b) that vibrates to generate sound, and a surround edge part 20 attached to the outer periphery side of the body part 10, as shown in Figs. 1 and 2. In this embodiment, the features are "the configuration of the body part 10 of the speaker diaphragm W1" and "the positional relationship between the body part 10 and the surround edge part 20." Below, the speaker diaphragm W1 will be described in order of the features of "the configuration of the body part 10" and the features of "the positional relationship between the body part 10 and the surround edge part 20."

[0019] Configuration of body part 10 As shown in the figure, the body portion 10 is formed in a cone shape (see FIG. 2) with a central hole 10c formed in the center thereof. In addition, a concave-convex honeycomb pattern 12 (see FIG. 1(b)) is formed on the back surface 10b of the body portion 10. As will be described later, the body portion 10 is provided at its outer end with a bent portion 10d (see FIG. 4 (omitted in FIGS. 2 and 5)) that is bent downward.

[0020] In this manner, the speaker diaphragm W1 of this embodiment is made of a cone paper made of pulp material, and the back surface 10b of the body portion 10 is provided with an uneven honeycomb pattern 12. That is, the body portion 10 of the speaker diaphragm W1 of this embodiment, which vibrates to generate sound, is made of thin and light cone paper, so that it can reproduce sounds up to a high frequency range. In addition, the material of this embodiment is inexpensive pulp material, and the manufacturing process is the same as the manufacturing process of a speaker diaphragm made of a paper cone of the prior art, so that it is possible to reduce the cost of the speaker. Furthermore, although the body portion 10 of the speaker diaphragm W1 is a thin and light diaphragm made of cone paper, its rigidity is increased by the uneven honeycomb pattern 12. Compared to speaker diaphragms formed of well-known cone paper, the speaker diaphragm W1 of this embodiment has increased rigidity, which suppresses split resonance during vibration, reduces distortion, and allows the reproduction of clear tones with flat characteristics up to high frequencies. According to the configuration of this embodiment, it is possible to provide a speaker diaphragm W1 that can be used for speakers ranging from large diameter to small diameter.

[0021] In the illustrated description, the uneven honeycomb pattern 12 is provided only on the back surface 10b of the body part 10, but this is not particularly limited. For example, in addition to the back surface 10b of the body part 10, the honeycomb pattern 12 may also be provided on the front surface 10a of the body part 10 (i.e., the honeycomb pattern 12 may be provided on both sides of the body part 10). Alternatively, the honeycomb pattern 12 may be formed only on the front surface 10a of the body part 10, not on the back surface 10b of the body part 10. In other words, it is sufficient that the honeycomb pattern 12 is provided on one or both of the front and back surfaces of the body part 10. With these configurations as well, the same effects as those of the illustrated example can be obtained.

[0022] 3, the honeycomb pattern 12 on the back surface 10b of the body portion 10 is formed of a core portion 12a recessed in a regular hexagonal shape in a plan view, and honeycomb rib portions 12b protruding from the outer periphery of the core portion (honeycomb rib portions 12b protruding in a hexagonal, annular shape). The honeycomb pattern 12 is formed of a plurality of "core portions 12a and honeycomb rib portions 12b." Furthermore, in this embodiment, the density of the pulp fibers in the core portion 12a is lower than the density of the pulp fibers in the honeycomb rib portion 12b.

[0023] In this way, the speaker diaphragm W1 of this embodiment has a different density of pulp fibers in the core portion 12a and the honeycomb rib portion 12b, which allows the core portion 12a of the honeycomb pattern 12 to have a moderate internal loss while increasing the rigidity of the honeycomb rib portion 12b. With this configuration, this embodiment can suppress mid-range components that cause muffled sounds, providing dynamic, rich bass sounds and clear, distinct sounds.

[0024] <<Arrangement of the body portion 10 and the surround edge portion 20>> Next, the positional relationship between the body portion 10 and the surround edge portion 20 will be described. The surround edge portion 20 constituting the speaker diaphragm W1 of this embodiment is formed in a ring shape in a plan view, as shown in Fig. 1. Also, as shown in Fig. 2, the surround edge portion 20 has an edge roll portion 20a that is recessed downward in a substantially arc shape at its center (central portion in the radial direction), a plate-shaped inner flange piece 20b that extends radially inward from the inner end of the edge roll portion 20a, and a plate-shaped outer flange piece 20c that extends radially outward from the outer end of the edge roll portion 20a.

[0025] The surround edge portion 20 is attached to the body portion 10 by attaching the inner flange piece 20b to a position radially inward from the outer end portion of the body portion 10 by a predetermined dimension, so that the edge roll portion 20a and the outer flange piece 20c are spaced apart from each other and the tip side of the outer flange piece 10c is a free end. The surround edge portion 20 is arranged such that a part of the edge roll portion 20a overlaps a part of the outer portion of the body portion 10 in the radial direction.

[0026] 4, the inner flange piece 20b of the surround edge portion 20 is attached to a position a predetermined dimension inward from the outer end of the body portion 10 so that the outer end of the body portion 10 is positioned at a position offset inward (radially inward) by "t mm" from the center of the edge roll portion 20a of the surround edge portion 20. In this embodiment, the edge roll portion 20a is positioned so that a portion having a dimension slightly smaller than the radius overlaps with a part of the outer portion of the body portion 10 in the radial direction.

[0027] The body portion 10 has a bent portion 10d that is bent downward from its outer end portion by "tmm". In this embodiment, in addition to the above, the inner flange piece 20b of the surround edge portion 20 is attached to the body portion 10 so that the lower end (free end) of the bent portion 10d has the same height dimension as the upper surface of the outer flange piece 20c of the surround edge portion 20.

[0028] Here, the reason for adopting the above configuration will be explained while comparing it with the configuration of speaker diaphragm 300 of the prior art. FIG. 6 is a schematic diagram of a speaker diaphragm of the prior art shown for comparison to explain the configuration of the speaker diaphragm of the embodiment of the present invention, where (a) is a schematic diagram showing the front surface of the speaker diaphragm of the prior art, (b) is a schematic diagram showing a cross section of the speaker diaphragm of the prior art, and (c) is a schematic diagram showing the back surface of the speaker diaphragm of the prior art.

[0029] As shown in FIG. 7, a speaker diaphragm 300 formed of cone paper according to the prior art has a cone-shaped body portion 310 and a surround edge portion 320 attached to the outer periphery of the body portion 10. The surround edge portion 320 also has an edge roll portion 320a that protrudes in an approximately arc shape approximately at the center, a plate-shaped inner flange piece 320b that extends radially inward from the inner end of the edge roll portion 320a, and a plate-shaped outer flange piece 320c that extends radially outward from the outer end of the edge roll portion 320a (see Figure 7(b)). In the illustrated example, the edge roll portion 320 has an upwardly convex up-roll shape, but may have a downwardly concave down-roll shape as in this embodiment.

[0030] In the surround edge portion 320 of the prior art, an inner flange piece 320b extending from the inner end portion of the edge roll portion 320a is attached to the outer end portion of the body portion 320, and the entire edge roll portion 320a is configured to protrude radially outward from the outer end portion of the body portion 320. In this way, the outer diameter of the speaker diaphragm 320 of the conventional technology is the sum of the outer diameter of the body portion 320, the radial dimension of the edge roll portion 320a of the surround edge portion 320, and the radial dimension of the outer flange piece 320c. The outer diameter of the speaker diaphragm 320 is limited by the object on which it is mounted, and in the configuration of the conventional technology, the outer diameter of the body portion 310 that generates sound is designed taking into account the radial dimension of the "edge roll portion 320a and outer flange piece 320c" of the surround edge portion 320.

[0031] 2 and 4, in this embodiment, the inner flange piece 20b of the surround edge portion 20 is attached to a position a predetermined dimension inward from the outer end of the body portion 10, and a part of the edge roll portion 20a is disposed so as to radially overlap a part of the outer portion of the body portion 10. Therefore, according to this embodiment, the radial dimension of the body portion 20 that vibrates to generate sound can be made larger than that of the speaker diaphragm 320 of the conventional technology shown in FIG. As a result, in this embodiment, since only the radial dimension of the body portion 10 can be increased without increasing the overall outer diameter dimension of the speaker diaphragm W1, the directivity can be broadened and the sound pressure can be increased compared to a "speaker diaphragm of the same outer diameter dimension (for example, the one shown in FIG. 7)" of the prior art. In other words, according to this embodiment, the directivity can be broadened and the sound pressure can be increased without increasing the radial dimension of the speaker diaphragm W1.

[0032] In this embodiment, as an example, the body portion 10 is formed with a bent portion 10d that is bent downward from its outer end portion by "tmm" as shown in Fig. 4. This allows the speaker diaphragm W1 of this embodiment to increase the rigidity of the outer periphery of the body portion 10, and as a result, it is possible to produce a tone that is audibly sharp and has a sense of speed.

[0033] 《Speaker diaphragm W1 manufacturing process》 Next, a manufacturing process for the speaker diaphragm W1 of this embodiment will be described. First, the raw pulp material is mixed with water in a beater and ground (beating process). Next, the beaten raw pulp fibers are dehydrated and processed into a three-dimensional shape by fitting them to a mold set in a papermaking machine (papermaking process). Next, the material is pressed into a mold and then thermally dried (molding process) to produce the body and intermediate products. At this time, the honeycomb pattern is also molded. In addition, the surround edge portion is manufactured in advance separately from the manufacturing of the body portion and intermediate product.

[0034] Finally, a hole is made in the center of the body part / intermediate product to open a center hole 10c to create the body part 10, and a process (finishing process) is performed in which a surround edge part 20 made of cone paper, which has been manufactured in advance, is attached to the body part 10. At this time, the inner flange piece 20b of the surround edge part 20 is attached to a position a predetermined dimension inside the outer end of the body part 10, and a part of the edge roll part 20a is arranged so as to overlap a part of the outer part of the body part 10 in the radial direction. This completes the speaker diaphragm W1 of this embodiment.

[0035] <Speaker SP equipped with speaker diaphragm W1> Next, a speaker SP equipped with the speaker diaphragm W1 of this embodiment will be described with reference to FIG. Here, FIG. 5 is a schematic diagram showing the configuration of a speaker equipped with the speaker diaphragm of this embodiment.

[0036] As shown in the figure, the speaker SP of this embodiment comprises a speaker frame (hereinafter simply referred to as the "frame") 30, a center pole 31 arranged under the center of the frame 30, a magnet 32 ​​and a plate 33 arranged around the center pole 31, a voice coil 34 arranged on the outer periphery of the center pole 31 and standing in the center of the frame 30, a damper 35 attached to the voice coil 34 and the frame 30, a cap 36 which is a cushioning material arranged at the tip of the voice coil 34, and a speaker diaphragm W1 attached to the tip side of the voice coil 34.

[0037] The frame 30 is formed in a cylindrical shape with a diameter enlarged toward the front end side in a substantially conical shape, with a holding portion 30a formed at the front end side and a rear end fixed to the upper surface of the plate 33. At the lower end side of the speaker diaphragm W1, the center hole 10c of the body portion 10 is attached to the voice coil 34. At the upper end side of the speaker diaphragm W1, the outer flange piece 20c of the surround edge portion 20 is fixed to the holding portion 30a provided at the front end side of the frame 30.

[0038] Thus, the speaker SP of this embodiment is provided with the speaker diaphragm W1 having the above-mentioned functions. Therefore, according to this embodiment, it is possible to provide a speaker SP that can reproduce clear tones up to high frequencies at a lower cost than a speaker provided with the three-layered speaker diaphragm 400 (see FIG. 8) of the prior art. In addition, as described above, the SP of this embodiment can enlarge the body portion 10 of the speaker diaphragm W1 without increasing the radial dimension of the speaker diaphragm W1. As a result, the speaker SP of this embodiment can widen the directivity and increase the sound pressure without increasing the radial dimension.

[0039] As described above, according to this embodiment, it is possible to provide a speaker diaphragm W1 capable of reproducing clear tones up to high frequencies at low cost, and a speaker SP equipped with the speaker diaphragm W1.

[0040] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention. For example, in the above-described embodiment, the body portion 10 of the speaker diaphragm W1 is formed in a cone shape, but is not particularly limited to this. Here, first and second modified examples in which the body portion 10 of this embodiment is modified will be described with reference to FIG.

[0041] Here, FIG. 6 is a schematic diagram for explaining modified examples of a speaker diaphragm of an embodiment of the present invention, where (a) is a schematic diagram showing the speaker diaphragm of this embodiment shown for comparison, (b) is a schematic diagram showing a first modified example of the speaker diaphragm, and (c) is a schematic diagram showing a second modified example of the speaker diaphragm.

[0042] Specifically, the body portion 110 may be flat, as in the speaker diaphragm W2 shown in Fig. 6(b). This body portion 110 has a honeycomb pattern 12 formed on the back surface, as in the above-described embodiment. Also, the body portion 210 may be parabolic, as in the speaker diaphragm W2 shown in Fig. 6(c). This body portion 210 has a honeycomb pattern 12 formed on the back surface, as in the above-described embodiment.

[0043] 6(b) and (c) show an example in which the edge roll portion 120a of the surround edge portion 120 has an upwardly convex up-roll shape, and the entire edge roll portion 120a protrudes radially outward from the outer end of the body portion 110 (or 210). However, in the first and second modified examples, the same configuration of the surround edge portion 20 as in the present embodiment shown in FIG. 6(a) may be adopted, the surround edge portion 20b may be attached to a position a predetermined dimension inward from the outer end of the body portion 110 (or 210), and a part of the edge roll portion 20a may be arranged to overlap a part of the outer portion of the body portion 110 (or 210) in the radial direction. [Explanation of symbols]

[0044] SP…Speaker W1…Speaker diaphragm 10. Body 10a…Surface 10b…Back side 10c…Center hole 10d…Bending part 12…Honeycomb pattern 12a…Core section 12b…Honeycomb rib section 20…Surround edge section 20a…Edge roll section 20b…Inner collar piece 20c…Outer flange piece W2: Speaker diaphragm 110…Body W3…Speaker diaphragm 210…Body 30…Frame 30a...Holding part 31…Center pole 32…Magnet 33…Plate 34…Voice coil 35…Damper 36…Cap

Claims

1. A speaker diaphragm made of a cone paper formed of a pulp material, A body part with a front and back surface that vibrates to generate sound; a surround edge portion attached to an outer periphery side of the body portion, The body portion has an uneven honeycomb pattern formed on one or both of its front and back surfaces, The honeycomb pattern is formed by a core portion recessed into a hexagonal shape in a plan view and a honeycomb rib portion protruding from an outer periphery of the core portion, A speaker diaphragm, wherein the density of the pulp fibers in the core portion is lower than the density of the pulp fibers in the honeycomb rib portion.

2. The surround edge portion is formed in an annular shape in a plan view, and includes an edge roll portion recessed in an approximately arc shape at an approximately central portion in the radial direction, a plate-shaped inner flange piece extending radially inward from an inner end portion of the edge roll portion, and a plate-shaped outer flange piece extending radially outward from an outer end portion of the edge roll portion, The speaker diaphragm of claim 1, further characterized in that the surround edge portion has an inner flange attached to a position a predetermined dimension inward from the outer end portion of the body portion, and a portion of the edge roll portion is positioned so as to overlap with a portion of the outer portion of the body portion in the radial direction.

3. A speaker diaphragm made of a cone paper formed of a pulp material, A body part with a front and back surface that vibrates to generate sound; a surround edge portion attached to an outer periphery side of the body portion, The body portion has an uneven honeycomb pattern formed on one or both of its front and back surfaces, The surround edge portion is formed in an annular shape in a plan view, and includes an edge roll portion recessed in an approximately arc shape at an approximately central portion in the radial direction, a plate-shaped inner flange piece extending radially inward from an inner end portion of the edge roll portion, and a plate-shaped outer flange piece extending radially outward from an outer end portion of the edge roll portion, Furthermore, the surround edge portion has an inner flange attached to a position inside the outer end portion of the body portion by a predetermined dimension, and a part of the edge roll portion is arranged to overlap a part of the outer portion of the body portion in the radial direction, The body portion has a bent portion bent downward from an outer end portion, A speaker diaphragm, wherein the free end of the bent portion has the same height dimension as an upper surface of the outer flange piece of the surround edge portion.

4. 4. The speaker diaphragm according to claim 1, wherein the body portion is formed in any one of a cone shape, a flat plate shape, and a parabolic shape.

5. A speaker comprising the speaker diaphragm according to any one of claims 1 to 4.

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