JP2013141278A - Speaker device, electronic apparatus using the same, and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an improved bass reproduction capability while saving a space with the thinning of a product concerning a speaker, electronic apparatus and device to be used in acoustic equipment.SOLUTION: A speaker device includes: a cabinet; a speaker unit attached to the cabinet; and a pressure adjustor arranged inside the cabinet. The pressure adjustor of the speaker device is configured to improve a bass reproduction capability while saving a space compared with a conventional manner through the use of a configuration in which the speaker device includes the pressure adjustor made of an activated-carbon sheet subjected to papermaking.

Description

  The present invention relates to a speaker device, an electronic device, and a vehicle that are used in various acoustic devices, information communication devices, and the like, and more specifically to a speaker device that realizes low-frequency reproduction in a small speaker cabinet.

  In recent audio market trends, high-quality playback support is becoming indispensable with the spread of digital audio equipment represented by DVD.

  On the other hand, under the circumstances of housing and the environment surrounding automobiles, space saving and energy saving are being strictly demanded.

  As a speaker and a speaker device that can satisfy the above-mentioned requirements, development of a speaker and a speaker device that are excellent in reproduction of heavy bass is demanded despite being small.

  Based on these backgrounds, the prior art will be described with reference to FIG.

  The conventional speaker device comprises a speaker device including a cabinet 10, a speaker unit 11 attached to the cabinet 10, and a pressure adjusting body 12 disposed inside the cabinet 10.

  Here, since the cabinet 10 is small in size, it is difficult to reproduce the low sound satisfactorily due to the acoustic stiffness exhibited by the vacant space of the cabinet 10.

  As one means for solving the problem of the bass reproduction limit determined by the cabinet volume in order to reproduce the bass sound satisfactorily with this small speaker device, the pressure regulator 12 represented by activated carbon or the like is provided inside the cabinet 10. It corresponds by arranging.

  Next, the operation of the speaker device will be described.

  When an electrical signal is applied to the speaker unit 11, the pressure in the cabinet changes, and the pressure in the vacant room in which the pressure adjusting body 12 represented by activated carbon or the like is arranged changes. Air molecules accompanying this pressure change are adsorbed or released to the pressure regulator 12, and the pressure fluctuation inside the cabinet 10 is suppressed.

  As described above, the conventional speaker device operates as a cabinet having an equivalently large volume, and can reproduce a low sound as if the speaker unit is mounted in a large cabinet while being a small cabinet.

  For example, Patent Document 1 is known as prior art document information relating to the invention of this application.

  Patent Document 2 is known as a paper with activated carbon in which granular activated carbon is made between papers during paper making.

JP-T-60-500635 JP 2002-327394 A

  However, although the conventional speaker device results in excellent bass reproduction capability in proportion to the weight of the activated carbon placed in the box, recently activated carbon is arranged as a result of the accelerated thinning of thin TVs. The space is also reduced, and the amount of activated carbon placed in a limited space is also reduced accordingly. Therefore, there is a problem that the effect of the pressure adjusting body is reduced and the bass reproduction capability is also lowered.

  An object of the present invention is to solve the above-mentioned problems and to provide a speaker box having a pressure adjusting body that is effective even in a space-saving manner and having improved bass reproduction capability.

  In order to achieve the above object, the pressure regulator according to the present invention is composed of an activated carbon sheet obtained by papermaking a material obtained by mixing activated carbon, chemical fibers, and a binder. That is, the conventional granular activated carbon is not placed in a bag as it is in a box, but is thinned into a sheet.

  Conventional pressure regulators put activated carbon in the bag to fix the position of the activated carbon.Because the activated carbon needs to have a layer between the bag and activated carbon in order to adsorb and desorb air, a certain thickness is required. However, since it is sufficient that the activated carbon is brought into contact with the binder or the chemical fiber and the contact between the activated carbons is reduced, the amount of air that can be adsorbed by the activated carbon is increased. Further, since an air layer between the activated carbon and the bag is not necessary, the air layer can be made thin and space can be saved. As a result, the sheet-like pressure adjusting body improves the bass reproduction capability even in a space-saving manner. In addition, even when the sheets are stacked, a space is generated because the sheets are not completely in close contact with each other, and the activated carbon adsorbs the air in the space, thereby further improving the bass reproduction capability.

  As described above, according to the present invention, a speaker box is configured by arranging a pressure adjusting body formed into a sheet. With this configuration, the pressure adjusting body can be made thinner than the conventional one, so that the bass reproduction capability is exhibited even in a space-saving manner. In addition, by overlapping the sheet-shaped pressure regulators, there is little space because the sheets are not completely in close contact, and the activated carbon sheet adsorbs the air in the generated space, increasing the amount of air adsorbed and the bass reproduction capability Will improve.

The figure which shows the speaker box which has arrange | positioned the pressure regulator in one embodiment of this invention. The schematic diagram of the pressure regulator in one embodiment of this invention 1 is an external view of an electronic device according to an embodiment of the present invention. Sectional drawing of the vehicle in one embodiment of this invention The figure which shows the speaker box which has arrange | positioned the conventional pressure regulator.

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

(Embodiment 1)
Hereinafter, the first to fourth aspects of the present invention will be described with reference to the first embodiment.

  FIG. 1 shows a speaker box in which a pressure adjusting body according to an embodiment of the present invention is arranged, and FIG. 2 shows a schematic diagram of the pressure adjusting body according to an embodiment of the present invention.

  As shown in FIGS. 1 and 2, the pressure adjusting body 13 is formed by forming a chemical fiber 13A into a sheet and using a binder 13C to increase the strength and further adsorbing granular activated carbon 13B on the surface of the fiber.

  This configuration eliminates the need for an air layer between the activated carbon 13B and the bag in which the activated carbon 13B is placed, so that the bulk of the pressure regulator 13 is smaller than before, and the space necessary to place the pressure regulator 13 in the box. Becomes smaller. As a result, even if it becomes smaller than the conventional pressure regulator, the bass reproduction capability is exhibited.

  Activated carbon as used herein refers to activated carbon that has an activation step after carbonization and has fine pores.

  In addition to the activated carbon, the activated carbon sheet has natural fibers and chemical fibers. The activated carbon is desirably 85% by weight or more, the natural fiber is 10% by weight or less, and the chemical fiber is 5% by weight or less. When the amount of activated carbon is less than 85% by weight, the bass reproduction capability is proportional to the amount of activated carbon, so the effect of improving the bass reproduction capability is reduced. Moreover, when the natural fiber increases, the ratio of activated carbon decreases for the same reason as described above, and the bass reproduction capability decreases. Chemical fiber is necessary to make the paper hard. If the paper is not hard, the activated carbon powder falls off and cannot be made into a sheet. In addition, it is possible to increase the weight of the activated carbon contained in the sheet by making it harder including chemical fibers. Therefore, the low-frequency sound reproduction ability is higher in the activated carbon sheet containing the chemical fiber.

  Moreover, you may use a binder instead of a natural fiber. The binder has the effect of preventing the activated carbon from falling off in a smaller amount than the natural fiber, and the content of the activated carbon increases. As a result, the bass reproduction capability is further improved. The composition of the sheet is preferably 90% by weight or more for activated carbon, 5% by weight or less for chemical fiber, and 5% by weight or less for binder. If the activated carbon is less than 90% by weight, in order to achieve the same performance, the thickness of the sheet must be increased, and the space effect is reduced. On the other hand, when the amount of the binder exceeds 5% by weight, the binder is adsorbed in the pores of the activated carbon, so that the air adsorbing ability is lowered and the bass reproduction ability is also lowered. Further, if the chemical fiber is more than 5% by weight, the effect of the activated carbon is lowered, so that it is preferably 5% by weight or less which is the minimum necessary for forming into a sheet.

  The particle size of the activated carbon 13B of the activated carbon sheet which is the pressure adjusting body 13 is desirably 10 μm or more and 100 μm or less. If the particle size of the activated carbon is larger than 100 μm, the activated carbon becomes bulky, so that the weight of activated carbon occupying the same surface area is reduced and the bass reproduction capability is lowered. On the other hand, if the particle size of the activated carbon is smaller than 10 μm, the activated carbon flows out from the mesh when paper is made, resulting in a poor yield. Further, if the mesh is made small in order to prevent the activated carbon from flowing out, dehydration takes time and productivity is lowered. Therefore, it is desirable that the activated carbon has a particle size of 10 μm or more and 100 μm or less in order to increase the productivity of papermaking and increase the bass reproduction capability.

  Moreover, even when using the activated carbon sheet of the same weight, it is desirable to use a plurality of stacked sheets. Since the air at the contact portion between the activated carbon sheets can also be used effectively, the amount of air adsorbed by the activated carbon increases. Therefore, the low-pitched sound reproduction ability is improved by forming sheets and stacking them rather than disposing granular activated carbon.

  Moreover, the natural fiber contained in the activated carbon sheet is inexpensive and increases the productivity of papermaking by using wood pulp. Moreover, in order to reduce an environmental load, you may use a non-wood pulp for natural fiber. In particular, when bamboo pulp is used for non-wood pulp, the activated carbon sheet obtained because the bamboo pulp itself is harder than the wood pulp becomes hard, and it is possible to reduce the collapse of the shape when placed in the box.

  The activated carbon sheet may have a sandwich structure coated with natural fibers. By covering with natural fibers, it is possible to prevent the activated carbon from falling off and the activated carbon powder that is conductive from floating inside the box to short-circuit the electronic device. In addition, since natural fibers transmit air, even if they are coated, the air adsorption ability can be maintained to some extent, so that the bass reproduction ability is not significantly reduced.

  Moreover, it is desirable that the cabinet be sealed. In the case of an open system, water adsorption is adsorbed on the pores of the activated carbon due to the influence of humidity and humidity depending on the use environment and the season, so that the air adsorption ability is lowered and the bass reproduction ability is also lowered. Therefore, it is preferable to have a structure that prevents moisture from entering by sealing.

  Examples of the present invention will be described below, but these examples do not limit the scope of the present invention.

Example 1
A sheet (45 mm × 105 mm, made of a mixture of 90% by weight of granular activated carbon obtained by carbonizing and activating coconut shell, 5% by weight of PET fiber as a chemical fiber, and 5% by weight of acrylic resin in a binder. A pressure adjusting body of t = 0.6 mm) was obtained.

(Example 2)
A sheet (45 mm × 105 mm) made of a mixture of 90% by weight of granular activated carbon obtained by carbonizing and activating palm shell, 8% by weight of wood pulp as natural fiber, and 2% by weight of PET fiber as chemical fiber , T = 0.6 mm).

(Comparative Example 1)
The granular activated carbon obtained by carbonizing and activating the coconut shell was put in a natural fiber bag of 45 mm × 105 mm to obtain a pressure adjusting body (45 mm × 105 mm, t = 1.8 mm).

<Characteristic evaluation>
The pressure adjusting body was placed in a speaker box, and frequency characteristics (F0) were measured. These measurement results are shown in the table below.

  From the table, it is clear that the speaker box equipped with the pressure adjusting body of the example has improved bass reproduction in a space-saving manner as compared with the pressure adjusting body of Comparative Example 1. From this, the pressure regulator of the embodiment can provide a speaker box with excellent bass reproduction capability even when the product is thinned, and can be downsized.

  As described above, according to the present invention, by constructing a speaker box having a pressure adjusting body of a paper-made activated carbon sheet, it is possible to improve the difficulty of low-frequency reproduction (f0 increase) as the box becomes smaller in size. Since the adjustment body can be made thin, low-frequency sound reproduction can be achieved in a smaller space.

(Embodiment 2)
Hereinafter, the invention according to claim 5 of the present invention will be described using the second embodiment.

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

  In the present embodiment, an audio mini-component system that is an electronic device is configured by mounting the speaker according to any one of claims 1 to 4.

  As shown in FIG. 3, the speaker 40 of the present invention is incorporated in an enclosure 41 to constitute a speaker system, and an amplifier 42 which is an amplifying means for an electric signal input to the speaker, and a source input to the amplifier An audio mini-component system 44, which is an electronic device, is configured by including a player 43 for output.

  With this configuration, it is possible to improve the durability and reliability of electronic devices, and to achieve digital compatibility, high input resistance, and heavy bass reproduction even with small, compact speakers. can do.

  In this embodiment, an example in which an electronic device is mounted on an audio minicomponent system has been described. However, the present invention is not limited to this, and may be a video device such as a television set or a mobile communication device. That is, the present invention can be applied to all electronic devices equipped with speakers.

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

  FIG. 4 is a sectional view of an automobile showing an apparatus according to an embodiment of the present invention.

  In the present embodiment, an automobile as a device is configured by mounting the speaker according to any one of claims 1 to 4.

  That is, the speaker 40 is mounted on the rear tray of the automobile 50.

  When the pressure adjusting body of the present invention is used, there is a feature that no vibration noise is generated even when the automobile is run.

  Therefore, it is possible to reduce the weight of the vehicle, which is a device, and to realize digital compatibility, high input resistance, and heavy bass reproduction even with a small and compact speaker.

  In addition, although this Embodiment demonstrated the example mounted in the motor vehicle as an apparatus, it is not limited to this, A moving apparatus, such as a train and a ship, Furthermore, structures, such as a house, may be sufficient. In other words, the present invention can be applied to all devices that are equipped with speakers.

  The speaker, electronic device and apparatus according to the present invention are electronic devices such as audiovisual equipment, information communication equipment, game equipment, etc. that need to be small, compact, digital compatible, high input resistance, and heavy bass reproduction. Applicable to devices such as automobiles.

10 Cabinet 11 Speaker 12 Pressure regulator (Conventional product)
13 Pressure regulator (product of the present invention)
13A Chemical fiber 13B Activated carbon 13C Binder 42 Amplifier 44 Mini component system 50 Automobile

Claims (6)

A speaker device comprising a cabinet, a speaker unit attached to the cabinet, and a pressure adjusting body disposed inside the cabinet, wherein the pressure adjusting body is:
An activated carbon sheet made of a material obtained by mixing activated carbon, a chemical fiber, and a binder, and the activated carbon sheet made of the paper has 90% by weight or more of activated carbon, 5% by weight or less of chemical fiber and 5% by weight or less of the binder. Speaker device. The speaker device according to claim 1, wherein the activated carbon has a particle size of 10 μm or more and 100 μm or less. The speaker device according to claim 1, wherein at least two activated carbon sheets are stacked. The speaker device according to claim 1, wherein the activated carbon sheet has a front surface and a back surface coated with natural fibers. An electronic device in which the speaker device according to claim 1 is incorporated in an enclosure of the device. A vehicle equipped with the speaker device according to claim 1.

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