JP2004274209A - Diaphragm for electroacoustic transducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm for an electroacoustic transducer which yields sufficient luminance in comparison with the conventional without illuminating with a lamp, has a long persisting light emission time, has improved rigidity of the diaphragm, and makes the sound quality excellent. <P>SOLUTION: A phosphorescent body is mixed in at least one of natural pulp, inorganic pulp and synthetic resin. The phosphorescent body is obtained by firing a mixture of an aluminate compound as a matrix and a rare earth element as an activator, and exhibits excellent luminance. Phosphorescence persistence time is made longer and hardness is high by including a function as a ceramic, so that hardness on the surface of the diaphragm is also improved and the sound quality becomes excellent. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a diaphragm for an electroacoustic transducer used for audio equipment, and more particularly to a diaphragm for an electroacoustic transducer that emits light even in a dark place.
[0002]
[Prior art]
Conventionally, as this type of diaphragm, Japanese Utility Model Laid-Open No. 62-198793 exists. The diaphragm has a structure in which a fluorescent paint is applied to the surface of the diaphragm by spraying to emit light.
[0003]
Another prior example is disclosed in Japanese Patent Application Laid-Open No. Sho 59-126398. In this prior example, similarly, a phosphor made of antimony / manganese-activated calcium halophosphate, which is excited by ultraviolet rays and emits white light, is applied to the front surface of the diaphragm, and the ultraviolet lamp is dimmed according to the intensity of the sound. A configuration in which light is applied to emit light is adopted.
[0004]
Still another prior example is disclosed in Japanese Patent Laid-Open No. Hei 8-265886. In this prior example, a fluorescent paint is applied to a diaphragm or an edge, and the fluorescent paint is irradiated with black light to emit light.
[0005]
[Problems to be solved by the invention]
Each of the above-described prior examples employs a configuration in which light is emitted by irradiating light with a lamp. Therefore, there has been a problem that desired light emission cannot be obtained unless irradiation with a lamp is performed.
[0006]
In addition, since a lamp is required, there is a problem that the cost is increased and a space for installing the lamp is required.
[0007]
The present invention has been proposed in view of the above, and the object thereof is not to irradiate light with a lamp, a sufficient luminance can be obtained as compared with a conventional product, and the light emission duration is long, and An object of the present invention is to provide a diaphragm for an electroacoustic transducer in which the rigidity of the diaphragm is improved and the sound quality is improved.
[0008]
[Means for Solving the Problems]
The present invention achieves the above object by employing a configuration in which a phosphorescent material is used by mixing with at least one of natural pulp, synthetic pulp, inorganic pulp, and synthetic resin.
[0009]
That is, the phosphor is configured such that a layer of a material mixed with at least one of natural pulp, synthetic pulp, inorganic pulp, and synthetic resin is provided on a part or the whole of the surface.
[0010]
In this case, it is characterized in that a layer of the luminous body is provided on the surface by a multilayer papermaking method.
[0011]
Alternatively, it is characterized in that an adhesive or a paint mixed with a luminous body is applied, and a layer of the luminous body is provided on a part or the entire surface.
[0012]
This phosphor is characterized by being made by adding an aluminate compound as a main component and adding an activator of a rare earth element, followed by firing.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
Embodiment 1
FIG. 1 is a partially cutaway perspective view of a diaphragm for an electroacoustic transducer according to a first embodiment of the present invention.
[0015]
In this embodiment, the diaphragm 1 is formed by first making a base material 2 to be the back surface of the diaphragm by a first paper making method, and then making a surface layer 3 by a second paper making method. After that, dehydration and hot press drying are performed, and finally, lacquer is impregnated and formed through a drying process.
[0016]
FIG. 2 shows an explanatory view of these manufacturing steps.
[0017]
As a material of the base material 2 on the back side, a material obtained by mixing NUKP at 70% by weight of 22 ° SR and cutting poly-para-phenylene-terephthal-amide fibers at 3 mm by 30% by weight was used.
[0018]
As a material of the surface layer 3, a mixture of 60% by weight of a phosphorescent substance (N-Night Luminescent G-300 series manufactured by Nemoto Special Chemical Co., Ltd.) with 40% by weight of bast fiber was used.
[0019]
A luminous body stores light energy of a light source such as a natural light, an incandescent lamp, or a mercury lamp in advance and emits light even after external light is removed, and is different from a luminous body (spontaneous luminous paint). This luminous body is obtained by adding an aluminate compound as a main component and adding a rare earth element activator to the luminous body, followed by firing.
[0020]
In other words, this phosphorescent material uses strontium aluminate (SrAl ₂ O ₄ ) as a host crystal, and high-purity alumina and strontium carbonate are doped with rare earth metals europium (Eu) and dysprosium (Dy), and then hydrogen atmosphere is used. It is formed by firing at a high temperature while reducing, and has properties as a ceramic.
[0021]
The minimum perceived luminance by the human eye is 0.32 mcd / m ^2. However, in the above-described phosphor, when light is applied to a sample applied with a thickness of 100 mg / cm ² , 0.32 mcd / m ² It has the property of maintaining the afterglow for about 2,000 minutes, and is excellent in luminance and its duration.
[0022]
This is because it contains a rare earth metal such as dysprosium (Dy) and increases the purity of the mixed material.
[0023]
Conventional phosphorescent materials mainly composed of CaS: Bi or zinc sulfide based on calcium sulfide have short luminance and light emission duration. Some strontium aluminates have a crystalline matrix, but also have problems in luminance and light emission duration.
[0024]
This is considered to be because it does not contain dysprosium (Dy), and the purity of the material to be mixed is low. From such a phosphorescent material and SrAl ₂ O ₄ : Eu, Dy used for the diaphragm according to the present invention. Compared with the phosphorescent body, the present invention has a high luminance so as to be visible all night, has a long light emission duration, and has excellent design properties.
[0025]
The presence or absence of this design is a commercially important factor. That is, when a product having a low design property is compared with a product having a high design property in the same product, the user naturally selects the latter, and the design property leads to so-called industrial applicability.
[0026]
Further, since this phosphorescent body is an oxide (ceramic) containing alumina as a main component and having high hardness, the hardness of the surface of the diaphragm 1 is also improved.
[0027]
As a material of the surface layer to be mixed with the phosphorescent material, it may be mixed with at least one of natural pulp, synthetic pulp and inorganic pulp.
[0028]
Further, in the illustrated example, the entire surface layer 3 is a layer including a luminous body, but may be a part.
[0029]
Further, a diaphragm may be produced by a multi-layer papermaking method of two or more layers, and the whole or a part of the surface layer 3 may be a layer containing a luminous body.
[0030]
The diaphragm 1 made of the two-layer papermaking method or the multilayer papermaking method of two or more layers can be easily manufactured by a known appropriate papermaking apparatus.
[0031]
The shape of the diaphragm 1 is not limited to a cone shape, but may be a dome shape, a flat plate shape, or any other appropriate shape.
[0032]
Embodiment 2
In the first embodiment described above, the case where the diaphragm having the surface layer 3 containing the luminous body is manufactured by the two-layer papermaking method or the multi-layer papermaking method, but the luminous body is added to the synthetic resin and the injection molding is performed. A diaphragm capable of emitting light may be formed by a method.
[0033]
Embodiment 3
FIG. 3 shows a third embodiment of the present invention. In this embodiment, a film formed by adding a luminous body to a synthetic resin is integrated on the surface of the diaphragm base material 2 made of paper by heating and welding, and the surface layer is formed of a layer containing the luminous body. 3A.
[0034]
Embodiment 4
A diaphragm that can emit light can be manufactured even when a phosphor layer is provided on a part or the entire surface of a diaphragm or a papermaking diaphragm formed by injection molding a synthetic resin.
[0035]
Embodiment 5
It is also possible to add a luminous body to the adhesive and apply it to part or all of the surface of the diaphragm to cause the diaphragm to emit light.
[0036]
Embodiment 6
A phosphor may be added to the paint, and the paint may be applied to part or all of the surface of the diaphragm, and a layer of the phosphor may be provided to cause the diaphragm to emit light.
[0037]
【The invention's effect】
As described above, according to the first and second aspects of the present invention, the light-emitting device includes a light-storing body that emits light by the afterglow due to the light-storing effect. it can.
[0038]
In the multilayer papermaking method according to the third aspect, a layer of a high-density luminous body can be easily provided only on one surface, and the production is easy. The afterglow can be obtained.
[0039]
Further, the same effect as described above can be obtained in the diaphragm according to the fourth aspect.
[0040]
Further, since the phosphorescent body used in the present invention is ceramic, the surface hardness is increased and the bending rigidity is improved, so that the distortion is reduced, and the sound quality is improved in addition to the design effect.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view of a diaphragm according to a first embodiment of the present invention.
FIG. 2 is an explanatory view of a manufacturing process according to the first embodiment of the present invention.
FIG. 3 is a schematic sectional view of a main part of a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Diaphragm base material 3 Surface layer 3A Layer containing luminous body

Claims (5)

A diaphragm for an electroacoustic transducer, comprising a phosphorescent body mixed with at least one of natural pulp, synthetic pulp, inorganic pulp and synthetic resin. A diaphragm for an electroacoustic transducer, wherein a layer of a material in which a phosphor is mixed with at least one of natural pulp, synthetic pulp, inorganic pulp, and synthetic resin is provided on a part or the whole of the surface. 3. The diaphragm for an electroacoustic transducer according to claim 2, wherein a layer of a luminous body is provided on the surface by a multilayer papermaking method. The diaphragm for an electroacoustic transducer according to claim 2, wherein an adhesive or a paint mixed with the phosphor is applied, and a layer of the phosphor is provided on a part or the whole of the surface. The diaphragm for an electroacoustic transducer according to any one of claims 1 to 4, wherein the phosphorescent body is formed by adding an aluminate compound as a main component and adding an activator of a rare earth element to the phosphor.

Images