JPH06178386A - Vibration board for cone speaker and its manufacture - Google Patents

Abstract

PURPOSE:To prevent the deterioration of sound quality by not being hurted by forming a wooden sheet in the shape of an vibration board and using it. CONSTITUTION:An external vibration board 15 is composed of the tubular part 20 in a tubular state at a back end part and a truncated cone part 21 in the shape of a truncated cone at a front part side, and a internal vibration board 16 is in the shape of a dome projecting forward. Then at least either of the vibration boards 15 and 16 is composed of the wooden sheet. Then, an edge part 17 is in the shape of a truncated cone and is composed of the truncated cone part on the outside periphery side of the truncated cone part 21 of the vibration board 15, a semicircular part 24 which projects upward and a flat part 25. The flat part 25 is in the shape of a face in the direction of back- forth and a gasket is fixed to the front face. The material of an enclosure is the same as that of the vibration boards 15 and 16 and is all composed of the wooden sheets. Thus, chemicals are not resolved so as not to have chemical change and a wooden fiber is not beaten so as not to be hurted to prevent the deterioration of the sound quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cone speaker diaphragm and a method of manufacturing the same.

[0002]

2. Description of the Related Art In general, it is preferable that the material of a diaphragm for a cone speaker is lightweight, has a suitable internal loss, and has a high rigidity. Therefore, conventionally, kraft paper made of kraft pulp has been widely used, which has excellent properties in terms of internal loss and specific gravity. By the way, when manufacturing a diaphragm made of kraft paper, first, wood chips are digested with chemicals and beaten to make kraft pulp. Had been press molded.

[0003]

However, in the above-mentioned conventional diaphragm, the wood fiber is chemically changed by the chemical agent and the wood fiber is damaged, so that the sound quality is deteriorated. Further, the conventional diaphragm cannot bring the tone color close to that of the live musical instrument. Further, since the conventional diaphragm is made of kraft paper, there is a problem that it lacks a high-grade feeling.

Further, in the past, wood chips were digested with chemicals and beaten to make kraft pulp, and the kraft paper obtained by straining this pulp was press-formed into a vibration plate having a predetermined shape. In addition to the large number of manufacturing steps of the diaphragm, there is a problem of pollution due to waste liquid because chemicals are used during the cooking of wood chips. An object of the present invention is to provide a diaphragm for a cone speaker that can solve the above problems and a method for manufacturing the diaphragm.

[0005]

To achieve the above object, the characteristic feature of the diaphragm for a cone speaker of the present invention is that it is made of a thin wooden plate formed in a diaphragm shape. In addition, a plurality of wood thin plates may be provided and these wood thin plates may be arranged in parallel in the radial direction of the diaphragm. In addition, a plurality of thin wood plates may be laminated and bonded in the direction of the central axis of the diaphragm. In addition, the grain of adjacent timber may be crossed. or,
Of the plurality of wood thin plates, the material of at least one wood thin plate may be different from the material of the other wood thin plates.

Further, the thin wooden plate may be superposed and adhered on a diaphragm for a cone speaker made of a material other than the thin wooden plate. A feature of the method for manufacturing a diaphragm for a cone speaker of the present invention is that a wood block is thinly sliced to form a flat thin plate, and the flat thin plate is press-formed into a vibration plate shape. . It should be noted that the wood block is sliced into thin pieces to form a flat thin plate, the flat thin plate is cut into a flattened shape of the diaphragm, and the cut flat thin plate is formed into a vibrating plate shape. Both ends in the direction may be bonded.

Further, the wood block is sliced into thin pieces to form a flat thin plate, and the flat thin plate is cut into a shape similar to the flat expanded shape of the vibrating plate, and the cut flat thin plate is vibrated. There is also a case where after forming a shape similar to a plate and adhering both end portions in the circumferential direction, this is press-formed into a vibration plate shape. Furthermore, the flat thin plate is
It may be boiled with high-temperature steam, hot water, or an alkaline solution having a pH of 10 or more. Further, the wood block may be directly machined into a diaphragm-shaped wood thin plate.
Further, a plurality of thin wood plates may be stacked and adhered.

[0008]

Since the vibrating plate is made of a thin wooden plate and the wood chips are not digested with chemicals, the wood fibers are not chemically changed and the wood fibers are not beaten so that the wood fibers are not damaged. Further, the tone color can be adjusted by selecting the type of wood used for the thin wood plate constituting the diaphragm or the wood part used for the thin wood plate.
Further, the wood chips are directly cooked without producing kraft pulp by cooking or beating the wood chips with a chemical, and the vibrating plate is produced by the wood thin plates. Therefore, the manufacturing process of the diaphragm can be shortened, and since the wood chips are not digested with chemicals, there is no waste liquid due to this digestion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings of FIGS. 1 and 2 show a speaker system, which consists of an enclosure 1 and a circular cone speaker 2.

As shown in FIGS. 3 and 4, the cone speaker 2 has a dish shape projecting rearward and has an opening 4 at the center.
And a ring-shaped upper plate 6 fixed to the rear surface of the frame 5, a ring-shaped magnet 7 fixed to the rear surface of the upper plate 6, and a lower plate 8 fixed to the rear surface of the magnet 7. A center pole 11 having a magnetic gap 10 formed between the central pole piece portion 9 and the upper plate 6, a voice coil 12 inserted into the magnetic gap 10, a voice coil bobbin 13 provided on the inner circumference of the voice coil 12, and a voice. A damper 14 provided on the outer periphery of the coil bobbin 13 and an outer diaphragm 15 having a truncated cone shape, and an inner diaphragm 16 mounted on the inner periphery of the outer diaphragm 15 and also serving as a dust cap.
And a ring-shaped edge 17 adhered to the outer peripheral portion of the outer diaphragm 15, a ring-shaped gasket 18 adhered to the outer peripheral portion of the edge 17, and the like.

The outer diaphragm 15 is composed of a cylindrical tubular portion 20 at the rear end portion and a truncated cone-shaped truncated cone portion 21 on the front side. Further, the inner diaphragm 16 has a dome shape protruding forward. In the present invention, at least one of the outer diaphragm 15 and the inner diaphragm 16 is made of a thin wooden plate, but in the embodiment, as shown in FIG. 5 and FIG. , Sakura, maple, maple, etc. are made of a thin wood plate of the same material. It should be noted that both diaphragms 15 and 16 may be made of thin wood plates made of different materials.

The edge 17 is made of a material such as acrylic coating cloth, urethane foam, polyurethane, elastomer, rubber or the like and has a truncated cone shape and is attached to the outer peripheral portion of the truncated cone portion of the outer diaphragm 15. The conical truncated cone portion 23 on the inner peripheral side to be fitted, the semicircular portion 24 protruding upward in a semicircular shape and located in the middle in the radial direction, and the gasket 18 having a planar shape in the front-rear direction and being fixed to the front surface And a flat portion 25 on the outer peripheral side. The material of the enclosure 1 is the same as the material of the outer and inner vibrating plates 15 and 16.

Next, a method of manufacturing the outer and inner diaphragms 15 and 16 will be described by taking the outer diaphragm 15 as an example. A method of manufacturing the edge 17 will be described at the same time. There are two types of methods of manufacturing the outer diaphragm 15: a method of manufacturing by press molding and a method of manufacturing by cutting, which will be described separately below.

[Press Molding Method] A wood block is sliced into thin pieces to produce a flat sheet, and then the flat sheet is cut into an appropriate size. The cut flat plate is boiled for about 3 minutes in steam obtained from a boiler at a temperature of about 180 ° C. and a pressure of 1 atm, or at pH 10 or higher, for example, pH 13 and caustic soda at a temperature of 60 ° C. Boil for about a minute. The boiled flat plate is sprayed with water by spraying at room temperature. The flat thin plate sprayed with water is press-molded for about 15 seconds, and the portion excluding the inner and outer peripheral edges is formed into the outer diaphragm 15. At this time, as shown in FIG. 7, upper and lower molds 29 and 30 having nichrome wires 27 and 28 therein are used, and the upper and lower molds 29 and 30 are heated to about 180 ° C. to form a flat plate shape. The thin plate 31 is press-molded.

The inner and outer peripheral edges of the press-molded thin wooden plate are cut into a predetermined size to form the outer diaphragm 15. The front side of the cut wood planks is ground with paper. In order to improve the moisture resistance, a thin wooden plate is dipped in a varnish of urethane type or the like, or a varnish is applied to the thin wooden plate to form the outer vibrating plate 15. On the other hand, after the material forming the edge 17 is press-molded into a predetermined shape by a press die, the inner and outer peripheral edges of this molded product are cut into a predetermined size to form the edge 17. The outer diaphragm 15 and the edge 17 are bonded together by a sticking die.

[Cutting Method] A wood block is cut into the shape of the outer diaphragm 15 by an NC lathe or the like. On this occasion,
Since the thickness of the outer diaphragm 15 is thin, first, a single-sided shape of the outer diaphragm 15 is cut into a wood block, and then a jig having a fixing surface having the same shape as the above-mentioned one side of the outer diaphragm 15 is used. The cut surface of the wood block is fixed to the fixed surface of the tool by a method such as bonding. Next, another one-sided shape of the outer vibration plate 15 is cut into the wood block to form the wood block into a thin wood plate in the shape of the outer vibration plate 15. Then, when the cutting is completed, the jig is removed from the thin wooden plate. After that, the steps 1 to 3 of the above press molding method are performed.

According to the embodiment constructed as described above, the outer and inner vibrating plates 15 and 16 are made of a thin wood plate rather than kraft paper, and the wood chips are not digested with chemicals. Since the wood fiber is not chemically changed and the wood fiber is not beaten, the wood fiber is not scratched, and the sound quality is not deteriorated due to the chemical change of the wood fiber or the wood fiber being scratched. Also, the type of wood used for the thin wood plates constituting the outer and inner vibrating plates 15 and 16, or
By selecting the part of the wood used for the thin wood plate,
The timbre can be adjusted to bring the timbre closer to that of a live instrument.

Furthermore, since genuine wood thin plates are used as the outer and inner vibrating plates 15 and 16 and natural wood grain is provided, a high-quality appearance can be obtained. Also, wood chips can be cooked with chemicals, or beating,
The wood thin plate is directly manufactured without producing kraft pulp, and the outer and inner vibrating plates 15 and 16 are produced by the wood thin plate.
The outer and inner diaphragms 1
It is possible to shorten the manufacturing process of Nos. 5 and 16 and to reduce the cost, and since wood chips are not cooked with a chemical, there is no fear of pollution due to waste liquid at the time of cooking.

Next, considering the enclosure 1, it is ideal that the enclosure 1 is made to have high rigidity thoroughly so as not to resonate at all, but it is impossible in reality. Also, the sound attenuation response, which is an important element of music, varies depending on the material of the enclosure 1. As described above, the reality is that the enclosure 1 itself emits a unique resonance sound depending on its material, and the enclosure 1 material is a composite material (for example,
If the surface of the particle board is a vinyl chloride resin, etc.), the effect of the surface material is also large.

Looking at a general speaker system, there are various types of diaphragms such as kraft paper, carbon, polypropylene, metal, etc. On the other hand, the enclosure is generally made of particle board with vinyl chloride resin stuck on the surface. Is. In the above system, the tone color peculiar to the diaphragm and the tone color peculiar to the enclosure are different from each other, which is harmful for audio reproduction. However, in the embodiment, since the material of the enclosure 1 is the same as the material of the outer / inner diaphragms 15 and 16, the unique timbre of the outer / inner diaphragms 15 and 16 and the unique timbre of the enclosure 1 are the same. , Preferable for audio reproduction.

When the enclosure 1 and the outer / inner vibrating plates 15 and 16 are made of different materials, a thin wood plate made of the same material as the outer / inner vibrating plates 15 and 16 may be attached as the surface material of the enclosure 1. , Preferable for audio reproduction. 8 and 9 show a second embodiment of the present invention, in which, when the outer diaphragm 15 is manufactured, a flat thin plate made of wood is formed into a flattened shape of the outer diaphragm 15, for example, shown in FIG. After being cut into such fan-shaped bodies 32, as shown in FIG. 8, the fan-shaped bodies 32 are formed into the shape of the outer diaphragm 15, and the corresponding end portions in the circumferential direction are formed on either or both sides. Adhesion is performed with the applied adhesive (acrylic solvent type or the like. Hereinafter, in the case of adhering, an adhesive of the above type or the like is used). Next, the outer vibration plate 15 is formed by the steps of the press molding method.

FIG. 10 shows a third embodiment of the present invention, which is a modification of the second embodiment and has a shape similar to that of a flat thin plate made of wood in which the outer diaphragm 15 is flatly developed. After cutting into a shape similar to that of the outer diaphragm 15, and by adhering to form a cone body 35, the cone body 35 is cut from the outer diaphragm by the steps 1 to 3 of the press molding method. 15 is manufactured, and at the time of this manufacturing, the nichrome wires 27, 2 as shown in FIG.
Press molding is performed using upper and lower molds 29 and 30 having 8 inside. According to the third embodiment described above, during press molding, a thin wooden plate having a shape similar to the outer vibrating plate 15, that is, a cone body 35 is used without using a flat thin plate.
The outer diaphragm 15 having a long length in the central axis direction, that is, the outer diaphragm 15 having a large half-vertical angle and the outer diaphragm 15 having a complicated shape.
The outer diaphragm 15 as described above can be easily manufactured by using a flat thin plate obtained by thinly slicing a wood block without causing cracks or the like at the time of manufacturing.

FIGS. 11 and 12 show a fourth embodiment of the present invention, in which the outer diaphragm 15 is a thin wooden plate 37 that constitutes the central side and a thin wooden plate 38 that constitutes the outer peripheral side.
And the outer peripheral portion of the wooden thin plate 37 on the central side and the inner peripheral portion of the thin wooden plate 38 on the outer peripheral side are overlapped with each other,
It is glued. The materials of the wood thin plate 37 on the central side and the wood thin plate 38 on the outer peripheral side are different, and one density is higher than the other density, for example. The wood thin plates 37, 38 are manufactured by the press molding method, the cutting method, or the second embodiment, respectively. In the press molding method,
Both wood thin plates 37 and 38 are bonded, and in the cutting method, both wood thin plates 37 and 38 are bonded after cutting the wood thin plates 37 and 38, respectively, and as in the second embodiment. In the case of such a manufacturing method, the wood thin plates 37 and 38 are bonded before or after the wood thin plates 37 and 38 are molded.

According to the embodiment configured as described above, the outer diaphragm 15 normally vibrates only in the central portion as the frequency becomes higher. Therefore, when the outer diaphragm 15 is constructed as described above, the frequency becomes higher. The higher it is, the thin wood plate 37 on the center side
Only the wood slabs 37,
By appropriately selecting the material of 38 and making the acoustic characteristics of the thin wooden plates 37, 38 different, it is possible to easily and satisfactorily control the sound pressure, the timbre, etc. with respect to the frequency.

13 to 16 show a fifth embodiment of the present invention, in which the outer and inner vibrating plates 15 and 16 are respectively arranged in the vertical direction (the central axis direction of the outer and inner vibrating plates 15 and 16). It is composed of a plurality of thin wood plates that are laminated and bonded. In the illustrated example, the outer and inner diaphragms 15 and 16 are
The wood thin plates 40 to 4 which are composed of the upper wood thin plates 40 and 41 and the lower wood thin plates 42 and 43 and which are vertically adjacent to each other
The 3rd grain is made to cross at right angles. The materials of the wood thin plates 40 to 43 are usually the same, but may be different. Also, the outer and inner diaphragms 1
5, 16 are manufactured in the same manner as in the fourth embodiment.

According to the embodiment constructed as described above, the thin wooden plates 40 to 4 constituting the outer and inner vibrating plates 15 and 16 are formed.
3 is a plurality, respectively, and these wood thin plates 40 to 43 are superposed and adhered to each other, and the wood grains 40 to 43 which are vertically adjacent to each other are arranged to cross each other in an orthogonal manner. The warp of the wood thin plates 40 to 43 is suppressed by the wood thin plates 40 to 43 that are vertically adjacent to each other, so that the outer and inner diaphragms 15 and 16 can be prevented from warping.
In the fifth embodiment, the outer and inner vibrating plates 15 and 16 are formed by stacking the thin wooden plates 40 to 43 on each other. However, a vibrating plate made of a normal material such as kraft paper is used. In some cases, thin wooden boards are stacked and bonded.

In addition, the above-mentioned respective embodiments may be combined appropriately, and for example, in the fourth embodiment, the wood thin plate on the central side and the wood thin plate on the outer peripheral side may intersect at right angles. is there. Further, although the outer diaphragm does not include the edge in the embodiment, it may include the edge. Although the above-described embodiments apply the present invention to a diaphragm for a cone speaker, the present invention is also applicable to a diaphragm for a dome (hemispherical) dome speaker. Next, an experiment was conducted by forming cone speakers using the outer diaphragm of the conventional example and the outer diaphragm of the fifth embodiment of the present invention. The outer diaphragm of the conventional example was made of unexposed kraft paper, and the edges were made of cotton cloth. The cotton cloth was impregnated with phenol and coated with acrylic.

Also, the inner diameter of the outer diaphragm is 20 mm, the outer diameter is 99 mm, the length in the front-rear direction is 26.5 mm, the length in the front-rear direction of the cylindrical portion is 1 mm, the radius of curvature in the cross section of the truncated cone is 100 mm, the outer side. The weight of the diaphragm is 4.0 g.
Also, the outer diameter of the edge is 130 mm and the inner diameter of the semi-circle is 100
mm, outer diameter 120 mm, semi-circle length 5 m
m. Further, the outer diaphragm of the fifth embodiment of the present invention has a two-layer structure of a thin wooden plate made of flat material,
The size and weight, and the material and size of the edge are the same as in the conventional example.

In the cone speaker, all parts except the outer diaphragm are the same. The dotted line in FIG. 17 is
The experimental result of the sound pressure frequency characteristic of the conventional example is shown, and the solid line shows the experimental result of the sound pressure frequency characteristic of the fifth embodiment of the present invention. In the conventional example, the sound pressure frequency characteristic has remarkably large peaks and dips in the frequency band of 5 KHz or more, but in the fifth embodiment of the present invention, the sound pressure frequency characteristic in the above band is flattened as compared with the conventional example. Has been done.

From the above sound pressure frequency characteristics, it can be inferred that the internal loss (tan δ) of the outer diaphragm of the fifth embodiment of the present invention is significantly larger than that of the outer diaphragm of the conventional example.
Next, the internal loss, Young's modulus, density, and sound velocity of the conventional example and the outer diaphragm of the fifth example of the present invention were measured. Table 1 below shows the measurement results.

[0031]

[Table 1]

As shown in Table 1, the outer diaphragm of the fifth embodiment of the present invention has an internal loss of about 1.27 times and a Young's modulus of about 3.08 times as compared with the outer diaphragm of the conventional example. , The density is about 1.
45 times, the sound velocity is about 1.46 times. That is, the fifth embodiment of the present invention is excellent as an acoustic diaphragm material in that the Young's modulus is also increased in comparison with the conventional example, even though the internal loss is increased. Further, when the sound quality was evaluated between the conventional example and the fifth embodiment of the present invention, the fifth embodiment of the present invention is better in separating human voice and instrument sound and between instrument sounds. The sound was well cut out, the reproducibility in the depth direction was good, and there was a sense of sound spread, and there was little noise.

[0033]

As described in detail above, according to the present invention,
The vibrating plate is made of wood thin plate instead of kraft paper.Since wood chips are not digested with chemicals, wood fibers do not chemically change and wood fibers are not beaten, so wood fibers may be damaged. In addition, there is no deterioration in sound quality due to chemical changes in wood fibers or damage to wood fibers.
In addition, the tone color can be adjusted by selecting the type of wood used for the thin wooden plate that constitutes the diaphragm or the part of the wood used for the thin wooden plate, and the tone color can be made closer to the tone color of the live musical instrument. . Furthermore, since a real thin wooden plate is used as the vibration plate and natural wood grain is exposed, a high-quality appearance can be obtained.

It is also possible to directly produce a thin wooden plate without producing kraft pulp by cooking or beating wood fibers with a chemical, and to produce a vibrating plate from this thin wooden plate. Therefore, the manufacturing process of the diaphragm can be shortened and the cost can be reduced.
Since wood chips are not cooked with chemicals, there is no risk of pollution due to waste liquid during cooking. Furthermore, since the vibration plate generally vibrates only in the central portion as the frequency increases, if the vibration plate is composed of a plurality of thin wood plates arranged in the radial direction as in claim 2, the frequency increases. As a matter of fact, only the wood thin plate on the center side vibrates, and by appropriately selecting the material of each wood thin plate and making the acoustic characteristics of each wood thin plate different, it is possible to easily adjust the sound pressure and tone with respect to frequency. It can be well controlled.

Further, as described in claims 3 and 4, a plurality of wood thin plates constituting the vibration plate are provided, and these wood thin plates are superposed and adhered in the vibration plate central axis direction, and at the same time, the vibration plate central axis is formed. When the wood grains adjacent to each other in the direction cross each other at right angles, the warp of each wood thin plate is suppressed by the adjacent wood thin plates, and the warp of the diaphragm can be prevented. Further, when the thin wood plate is placed on the cone speaker diaphragm made of a material other than the thin wood plate and adhered, the sound quality, tone color, appearance and the like can be improved. Further, according to claim 9, at the time of press molding, a thin wooden plate formed in a shape similar to the vibration plate is used instead of the flat thin plate. Therefore, the vibration plate having a long central axis direction, That is, when manufacturing a diaphragm with a large half-vertical angle or a diaphragm with a complicated shape, cracks etc. do not occur, and even the diaphragm as described above can be easily manufactured by using a flat thin plate. it can.

[Brief description of drawings]

FIG. 1 is a front view of a speaker system according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the speaker system according to the first embodiment of the present invention.

FIG. 3 is a sectional view of the cone speaker of the first embodiment of the present invention.

FIG. 4 is an exploded view of the diaphragm and the like according to the first embodiment of the present invention.

FIG. 5 is a perspective view of an outer diaphragm according to the first embodiment of the present invention.

FIG. 6 is a perspective view of an inner diaphragm according to the first embodiment of the present invention.

FIG. 7 is a cross-sectional view of a press die or the like according to the first embodiment of the present invention.

FIG. 8 is a perspective view of an outer diaphragm according to a second embodiment of the present invention.

FIG. 9 is a plan view of a fan-shaped body according to a second embodiment of the present invention.

FIG. 10 is a sectional view of a press mold and the like according to a third embodiment of the present invention.

FIG. 11 is a perspective view of an outer diaphragm according to a fourth embodiment of the present invention.

FIG. 12 is an explanatory diagram illustrating a method of manufacturing the outer diaphragm according to the fourth embodiment of the present invention.

FIG. 13 is a sectional view of an outer diaphragm according to a fifth embodiment of the present invention.

FIG. 14 is a sectional view of an inner diaphragm according to a fifth embodiment of the present invention.

FIG. 15 is an explanatory diagram illustrating a method of manufacturing the outer diaphragm according to the fifth embodiment of the present invention.

FIG. 16 is an explanatory diagram illustrating a method of manufacturing an inner diaphragm according to a fifth embodiment of the present invention.

FIG. 17 is a graph showing experimental results on sound pressure frequency characteristics of the conventional example and the fifth example of the present invention.

[Code]

1 ... Enclosure, 2 ... Circular cone speaker, 1
5, 16 ... Outer / inner diaphragm, 17 ... Edge, 29, 3
0 ... Top / bottom mold, 32 ... Fan-shaped body, 35 ... Cone body, 3
7, 38, 40-43 ... Wood thin plate.

Claims (12)

[Claims] 1. A diaphragm for a cone speaker comprising a thin wooden plate formed in a diaphragm shape. 2. The diaphragm for a cone speaker according to claim 1, wherein a plurality of thin wood plates are provided, and the thin wood plates are arranged in parallel in a radial direction of the diaphragm. 3. The diaphragm for a cone speaker according to claim 1, wherein a plurality of wood thin plates are provided, and these wood thin plates are superposed and adhered to each other in the central axis direction of the vibration plate. 4. The diaphragm for a cone speaker according to claim 2 or 3, wherein the wood grain of adjacent wood thin plates intersect each other. 5. The vibration for a cone speaker according to claim 2, wherein at least one of the plurality of wood thin plates is made of a material different from that of the other wood thin plates. Board. 6. A cone speaker diaphragm, wherein the wood thin plate is laminated and adhered to a cone speaker diaphragm made of a material other than the wood thin plate. 7. A method of manufacturing a diaphragm for a cone speaker, which comprises thinly slicing a wood block to form a flat thin plate, and press-molding the flat thin plate into a diaphragm shape. 8. A thin block of a wood block is sliced to form a flat thin plate, the flat thin plate is cut into a shape in which a vibration plate is developed, and the cut flat thin plate is formed into a vibration plate shape. And a method for manufacturing a diaphragm for a cone speaker, characterized in that both ends in the circumferential direction are adhered. 9. A wood block is sliced into thin pieces to form flat plate-like thin plates, and the flat plate-like thin plates are cut into a shape similar to the flattened shape of a vibration plate, and the cut flat plate-like thin plates are vibrated. A method for manufacturing a diaphragm for a cone speaker, which comprises forming a shape similar to a plate, adhering both ends in the circumferential direction, and press-molding the plate into a diaphragm shape. 10. The method of manufacturing a diaphragm for a cone speaker according to claim 7, wherein the flat plate is boiled with high-temperature steam, hot water, or an alkaline solution having a pH of 10 or more before press molding. 11. A method of manufacturing a diaphragm for a cone speaker, which comprises directly cutting a wood block into a thin wood plate having a diaphragm shape. 12. The method for manufacturing a diaphragm for a cone speaker according to claim 7, wherein a plurality of thin wooden plates are stacked, and laminated.