JP2008193477A - Speaker box, speaker system using the same and electronic apparatus using the speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contribute to the improvement of sound quality by providing a speaker box with an environment-conscious performance and sufficient thermal resistance and strength as a speaker box regarding a speaker box used in various acoustic equipment. <P>SOLUTION: The speaker box is made of two or more kinds of materials, wherein bamboo fiber is used as reinforcement fiber in place of glass fiber. As to resin, the amount of fossil resources usage is 100 MJ/kg or below expressed in terms of energy, and a polylactic acid is the most desirable among fossil resources. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker box and a speaker system used for various kinds of audio equipment.

  In recent years, protecting the global environment has become one of the important factors for corporate activities.

  In addition to the RoHS regulations currently in force, there is a movement toward regulation of VOCs (volatile organic compounds) as automotive parts.

  In addition, 3R (reduction in use, recycling, and reuse) of petroleum-derived compounds has become important in order to predict that petroleum resources will be depleted in about 40 years.

  On the other hand, what is commonly referred to as pulp is produced by cooking conifers and hardwoods. Therefore, a decrease in wood resources has become a global problem.

  In the acoustic industry, resin speaker boxes are frequently used.

  Such resins are generally reinforced with highly rigid fibers such as glass fibers, carbon fibers, and aramid fibers, and inorganic fillers having a very small particle size.

  A resin material reinforced with fibers is usually called FRP (fiber reinforced plastic), and many studies have been conducted.

  In recent years, a speaker box using an organic reinforcing material has been studied.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP 57-35496 A

  Conventional resin speaker boxes are made of resin and cellulose reinforcement to improve sound quality. Polystyrene, which is often used as a resin, has poor heat resistance, and styrene, the raw material, is used for the human body. This is a resin that is not suitable for the environment because of its negative effects.

  In addition, if inorganic reinforcement is used, the tone does not tend to be profound, high-class, or warm, and has a problem that it becomes a tasteless and dry tone, and it cannot be recycled due to inorganic reinforcement. It had the problem that.

  An object of the present invention is to provide a speaker box that is friendly to the global environment, has sufficient strength and heat resistance as a resin speaker box, and can realize a good sound quality that can give a warm tone.

  In order to achieve the above-mentioned object, the present invention constitutes a speaker box from two or more types of materials, and one of the two or more types of materials constitutes a speaker box as bamboo fiber.

  With this configuration, a speaker box that can be recycled and can achieve good sound quality can be obtained.

  The speaker box of the present invention is composed of two or more kinds of materials, and one kind of the two or more kinds of materials is constituted as bamboo fiber.

  Therefore, it has sufficient strength and heat resistance as a speaker box, can warm the tone, and can realize a good sound quality that is comfortable to human ears.

  Furthermore, it can be recycled and can be made environmentally friendly.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
Hereinafter, the first to seventh aspects of the present invention will be described using the first embodiment.

  FIG. 1 shows a cross-sectional view of a speaker box according to an embodiment of the present invention.

  Reference numeral 1 denotes a speaker box, which is composed of two or more kinds of materials.

  One of the two or more materials is bamboo fiber.

  Here, the reason why this bamboo fiber is used will be described below.

  When natural fibers themselves take several decades to grow like conifers, cutting them down and using them will cause a desertification phenomenon on the earth.

  Examples of natural fibers used in the present invention include fast-growing bamboo fibers, bromeliad plant fibers, and kenaf fibers.

  Among these, bamboo fiber is most preferable from the viewpoints of rigidity and availability.

  And since this bamboo fiber strengthens the entanglement between bamboo fibers by advancing the beating, the strength increases with a small amount of filling.

  About beating, the beating degree in Canadian standard freeness is preferably 300 ml or less.

  If it is 300 ml or more, the reinforcing effect is remarkably smaller than that of glass fiber.

  More preferably, it is 100 ml or less, and in this case, the strength is often higher than when reinforced with glass fiber.

  As a form of the fiber, a form in which the trunk is 30 μm or less and the surface has fibers of 1 μm or less in a branch shape is most preferable.

  And it is essential that resin used for this invention is resin with a small environmental impact.

  Examples of these resins with a low environmental load include polypropylene (77 MJ / kg), amorphous polyethylene terephthalate (76 MJ / kg), and polylactic acid (54 MJ / kg) as resins having a fossil resource usage of 100 MJ / kg.

  Among these, polypropylene and polylactic acid are preferable as the acoustic material.

  Furthermore, polylactic acid is the most preferable because it uses the least amount of petroleum resources and can be biodegraded.

  Moreover, as a manufacturing method as a speaker box, it is preferable that injection molding is possible.

  By injection molding, it is possible to give the shape a degree of freedom and improve productivity.

  EXAMPLES Hereinafter, examples will be described as the best mode of the present invention and examples of the present invention, but the scope of the present invention is not limited at all.

  In the embodiment of the present invention, natural fibers obtained from bamboo fibers are beaten at a beating degree of 100 ml to 300 ml, and the polylactic acid is 10 wt% or more and less than 70 wt%, preferably 30 wt% or more and less than 60 wt%. To fill.

  If it is less than 10 wt%, the reinforcing effect is small, and if it is 70 wt% or more, the resin viscosity increases and the resin does not flow easily.

  When the content is 30 wt% or more and less than 60 wt%, the variation is small and molding is sufficiently possible.

  Hereinafter, the result of carrying out a comparative experiment on the speaker box of the present invention and the conventional speaker box will be shown.

(Example 1)
A speaker box having a width of 250 mm, a height of 400 mm, a depth of 250 mm, and a thickness of 15 mm was produced by injection molding from pellets of 50 wt% bamboo fiber having a beating degree of 180 ml in Canadian standard freeness and 50 wt% polypropylene.

(Example 2)
A speaker box was prepared in the same manner as in Example 1 with 13 wt% bamboo fiber and 87 wt% polylactic acid having a beating degree of 120 ml in Canadian standard freeness.

(Example 3)
A speaker box was produced in the same manner as in Example 1 with a beating degree of 280 ml of bamboo fiber 65 wt% and polylactic acid 35 wt% at a Canadian standard freeness.

(Comparative example)
A speaker box having the same size as in Example 1 was obtained with 70 wt% polypropylene containing 30 wt% glass fiber.

  The speaker boxes of Examples 1 to 3 and the comparative example were buried in the soil, and two years later, a hole was dug and searched.

  In Example 1 and the comparative example, the speaker box remained, but Example 2 could not be found.

  Moreover, Example 3 did not leave the form of a speaker box.

  Thereafter, Example 1 and the comparative example were washed and dried, and then burned with fire.

  Although it was difficult to burn because polypropylene contained a flame retardant, Example 1 burned into ash, but the comparative example could not burn the glass fiber, and the glass fiber remained. .

  From the above experimental results, the superiority of the present invention compared to the conventional product was supported.

  Therefore, the speaker box according to the present invention is composed of two or more kinds of materials, and one of the two or more kinds of materials has a sufficient strength and heat resistance as a speaker box by being composed of bamboo fiber, and the tone color. In addition, it is possible to achieve a good sound quality that is warm and comfortable to the human ear.

  Furthermore, it can be recycled, has little adverse effects on the human body, and can be made environmentally friendly.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second aspect of the present invention.

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

  As shown in FIG. 2, a speaker system 3 is configured by mounting a speaker unit 2 on the speaker box 1 described in the first embodiment.

  With this configuration, it has sufficient strength and heat resistance, can warm up the timbre, can achieve good sound quality that is comfortable to human ears, can be recycled, has little adverse effect on the human body, and is friendly to the global environment A gentle speaker system can be realized.

(Embodiment 3)
The third aspect of the present invention will be described below with reference to the third embodiment.

  FIG. 3 is an external view of an audio minicomponent system that is an electronic apparatus according to an embodiment of the present invention.

  As shown in FIG. 3, a speaker unit 2 is mounted on the speaker box 1 of the present invention to constitute a speaker system 3. An audio mini-component system 44, which is an electronic device, includes a player 43 that outputs an input source.

  With this configuration, high sound quality, high quality, and high reliability can be achieved, recycling is possible, and there is little adverse effect on the human body, and a mini component system that is friendly to the global environment can be realized. .

  The speaker box and the speaker system according to the present invention can be applied to global environment protection, high quality, high reliability, and sound quality improvement.

Sectional drawing of the speaker box in one embodiment of this invention Sectional drawing of the speaker system in one embodiment of this invention 1 is an external view of an electronic device according to an embodiment of the present invention.

Explanation of symbols

1 Speaker box 2 Speaker unit 3 Speaker system

Claims (9)

A speaker box composed of two or more kinds of materials, wherein one of the two or more kinds of materials is a bamboo fiber. The speaker box according to claim 1, wherein the bamboo fiber has a beating degree at a Canadian standard freeness of 300 ml or less. 2. The speaker box according to claim 1, wherein the bamboo fiber is made of a fiber having a fiber trunk of 30 [mu] m or less and feathered in a branch shape and having a diameter of 1 [mu] m or less. 2. The speaker box according to claim 1, wherein the main component of the material other than the bamboo fiber is a resin, and the amount of fossil resources used at the time of the resin production is 100 MJ / kg or less in terms of energy. The speaker box according to claim 1, comprising polylactic acid. 2. The speaker box according to claim 1, wherein the composition ratio of the bamboo fiber is 10 wt% or more and less than 70 wt%. The speaker box according to claim 1, which is manufactured by injection molding. A speaker system in which a speaker unit is mounted on the speaker box according to claim 1. An electronic apparatus comprising a speaker system in which a speaker unit is mounted on the speaker box according to claim 1, and at least an amplifier circuit for an input signal to the speaker system.

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