JP2006101031A - Speaker instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker instrument capable of keeping physical attraction capability in an attraction body for a long time in the speaker instrument having the attraction body for attracting gas into a cabinet physically. <P>SOLUTION: The attraction bodies 13 composed of porous materials and those in which photo catalysts are added or mixed to the porous materials are arranged inside the cabinet 11 of the speaker instrument. And light can be applied to the attraction bodies 13, thus eliminating or decomposing a substance for deteriorating a physical attraction effect adhering onto the surfaces of the attraction bodies 13, and maintaining a physical attraction function that the attraction bodies 13 have. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker device, and more particularly to a speaker device that realizes low-frequency sound reproduction with a small speaker cabinet.

  In general, it is difficult for a small speaker device to realize a speaker system capable of low-frequency reproduction due to the influence of acoustic stiffness exhibited by a vacant space of a speaker cabinet. Conventionally, in order to realize bass reproduction with this small speaker device, as one means for solving the problem of the bass reproduction limit determined by the cabinet volume, there is a sealed speaker device in which a lump of activated carbon is arranged inside the cabinet. (For example, refer to Patent Document 1).

  FIG. 8 is a structural cross-sectional view of a main part of a conventional speaker device described in Patent Document 1. In FIG. 8, the speaker device includes a cabinet 81, a bass speaker 82, activated carbon 83, a support member 84, a diaphragm 85, a vent pipe 86, and a treble speaker 87. The low sound speaker 82 and the high sound speaker 87 are attached to the front surface of the cabinet 81. The activated carbon 83 is arranged in a lump shape in which granular materials are aggregated inside the cabinet 81, and is supported by the back surface, bottom surface, top surface, left and right side surfaces of the cabinet 81, and the support member 84. The support member 84 is formed with pores that allow air to pass through the entire surface thereof. The ventilation pipe 86 is provided in the diaphragm 85 and ventilates between the activated carbon 83 and the low sound speaker 82 and the high sound speaker 87.

  Next, the operation of the speaker device will be described. When an electric signal is applied to the bass speaker 82, the pressure in the cabinet 81 changes, and the diaphragm 85 vibrates due to this pressure. And the pressure of the empty space in which the activated carbon 83 is arranged is changed by the vibration of the diaphragm 85. The activated carbon 83 is supported in a lump shape by the support member 84 and the cabinet 81, but since pores are provided on the entire surface of the support member 84, air molecules accompanying a pressure change due to vibration of the diaphragm 85 are generated in the activated carbon 83. Adsorbed or released, the pressure fluctuation in the cabinet 81 is suppressed. The vent pipe 86 prevents pressure fluctuations in the space surrounded by the diaphragm 85 including the activated carbon 83 and the cabinet 81 due to the ambient temperature of the speaker device and changes in internal pressure.

As described above, the conventional speaker device operates as a cabinet having an equivalently large volume, so that low-pitched sound reproduction is possible as if the speaker unit was mounted in a large cabinet.
JP-T-60-500635

  However, the conventional speaker device causes irreversible adsorption simultaneously with physical adsorption in which an adsorbent such as activated carbon 83 is reversibly changed. And the irreversible adsorption | suction of an adsorbent advances, the pore which can be physically adsorbed which an adsorbent has decreases, and the function which can be physically adsorbed falls with time.

  Therefore, an object of the present invention is to provide a speaker device having an adsorbent (activated carbon) that physically adsorbs gas in a cabinet and capable of maintaining the physical adsorption capacity of the adsorbent for a long period of time. That is.

In order to achieve the above object, the present invention has the following features.
1st invention is a speaker apparatus provided with a cabinet, a speaker unit, and an adsorption body. The speaker unit is attached to the cabinet. The adsorbent is disposed in an empty space inside the cabinet and physically adsorbs the gas. The adsorbent is arranged so that at least a part thereof is irradiated with light.

  In a second aspect based on the first aspect, at least a part of the cabinet is formed of a transparent member. The adsorbent is arranged so that light is irradiated from the outside of the cabinet through a cabinet formed of a transparent member.

  In a third aspect based on the second aspect, a light source is further provided. The light source is fixed to the outside of the cabinet and irradiates the adsorbent with light through the cabinet formed of a transparent member.

  In a fourth aspect based on the first aspect, a light source is further provided. The light source is fixed inside the cabinet and irradiates the adsorbent with light.

In a fifth aspect based on the first aspect, the adsorbent is activated carbon, zeolite, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₃ ), magnesia (MgO), or iron trioxide. It is composed of at least one selected from the group of porous materials consisting of (Fe ₃ O ₄ ), molecular sieves, fullerenes, and carbon nanotubes.

  In a sixth aspect based on the first aspect, the adsorbent includes a porous material that physically adsorbs a gas and a photocatalyst added to or mixed with the porous material.

In a seventh aspect based on the sixth aspect, the photocatalyst comprises titanium oxide (TiO ₂ ), niobium oxide (Nb ₂ O ₅ ), iron sesquioxide (Fe ₂ O ₃ ), zinc oxide (ZnO), tungsten oxide. (WO ₃ ), tin oxide (SnO ₂ ), cadmium sulfide (CdS), zinc sulfide (ZnS), mercury sulfide (Ag ₂ S), and at least one selected from the group consisting of strontium titanate (SrTiO ₃ ) is there.

  In an eighth aspect based on the sixth aspect, the photocatalyst is activated in response to the wavelength of light irradiated to the adsorbent.

  According to the first invention, the adsorbent that physically adsorbs the gas is arranged inside the cabinet to which the speaker unit is attached, and the gas molecules inside the cabinet are adsorbed / desorbed by the gas adsorbing action of the adsorbent, and the internal pressure fluctuations Is suppressed to an equivalently large volume. Therefore, the speaker device operates as if the speaker unit is attached to a cabinet with a large volume, and can reproduce a low frequency band with an increased internal volume. Since the adsorbent inside the cabinet can be irradiated with light, the surface and the inside of the adsorbent are heated by the light irradiation, and a part of the substance adsorbed on the adsorbent surface is desorbed by the heat. be able to. Thereby, it is possible to recover the physical adsorption function of the adsorbent, and it is possible to recover and maintain the reproduction capability of the low frequency band such that the internal volume that the speaker device can increase is increased.

  According to the second invention, since a part of the cabinet is formed of a transparent member, it is possible to project light from the outside into the cabinet, and from a light source separate from sunlight and the speaker device. The physical adsorption function of the adsorbent can be recovered by using the light.

  According to the third invention, the physical adsorption function of the adsorbent can be recovered by providing the light source outside the speaker device and irradiating the adsorbent with light from the light source via the transparent member. If the light source itself generates heat, a part of the substance adsorbed on the adsorbent surface can be similarly desorbed by adopting a configuration in which the heat is transmitted to the adsorbent.

  According to the fourth invention, the physical adsorption function of the adsorbent can be recovered by providing a light source inside the speaker device and irradiating the adsorbent with light from the light source. If the light source itself generates heat, a part of the substance adsorbed on the adsorbent surface can be similarly desorbed by adopting a configuration in which the heat is transmitted to the adsorbent.

According to the fifth invention, the adsorbent disposed inside the cabinet is activated carbon, zeolite, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₃ ), magnesia (MgO), iron trioxide. (Ca ₃ O ₄ ), molecular sieves, fullerenes, and one selected from the group of porous materials consisting of carbon nanotubes, or a combination thereof, thereby making the cabinet volume equivalently large and increasing the internal volume. It becomes possible to reproduce a low frequency band that has increased.

  According to the sixth invention, when the adsorbent is constituted by adding or mixing a photocatalyst to a porous material, the light irradiated to the adsorbent has a wavelength capable of activating the photocatalyst. It is possible to decompose organic substances adsorbed on the surface of the material.

According to the seventh invention, the photocatalyst is composed of titanium oxide (TiO ₂ ), niobium oxide (Nb ₂ O ₅ ), iron sesquioxide (Fe ₂ O ₃ ), zinc oxide (ZnO), tungsten oxide (WO ₃ ), One selected from the group consisting of tin oxide (SnO ₂ ), cadmium sulfide (CdS), zinc sulfide (ZnS), mercury sulfide (Ag ₂ S), and strontium titanate (SrTiO ₃ ), or a combination thereof By doing so, it is possible to decompose organic substances adsorbed on the surface of the porous material.

  According to the eighth invention, it is possible to irradiate the adsorbent with light containing a specific wavelength, and to decompose the organic matter in contact with the photocatalyst activated in response to the wavelength. It is excited by irradiating light containing a wavelength that excites the photocatalyst, and the organic substance on the adsorbent surface is oxidatively decomposed by the strong oxidizing action of OH radicals generated on the surface of the excited photocatalyst. Can be maintained.

  Next, before describing specific embodiments of the present invention, an outline of the present invention will be described in order to facilitate understanding of the present invention. The present invention is a speaker device in which an adsorbent such as activated carbon that physically adsorbs gas is disposed in a cabinet, and is configured to irradiate the adsorbent with light.

In the adsorbent, the following three phenomena occur by light irradiation.
1. The surface and the inside of the adsorbent are heated by the irradiated light, and a part of the substance adsorbed near the adsorbent surface is desorbed by the heat.
2. When a light source that emits heat is used as a light source for irradiating light to the adsorbent, and the heat is transmitted to the adsorbent, part of the substance adsorbed near the adsorbent surface is similarly desorbed.
3. Add a predetermined photocatalyst to the surface of the adsorbent placed in the cabinet, or mix adsorbent and photocatalyst, and use a light source that emits light having a wavelength that activates the photocatalyst. The organic matter adsorbed on is decomposed.

  With regard to the above phenomenon 1 and phenomenon 2, it is known that the amount of adsorption due to physical adsorption of the adsorbent decreases with increasing temperature. In the present invention, the phenomenon in which adsorbed substances are desorbed with increasing temperature of the adsorbent is used. To do. For example, in order to completely desorb a substance in activated carbon, which is an example of an adsorbent, a temperature of about 110 ° C. is necessary for moisture, 350 ° C. for low-boiling organic substances, and about 1000 ° C. for complete regeneration. Yes. Therefore, considering these temperatures, complete desorption in the speaker device is not realistic, but it is not possible to desorb water vapor or a part of low-boiling organic substances adsorbed on the adsorbent as the temperature rises. it can. That is, by utilizing the above phenomenon 1 and phenomenon 2, a part of the physical adsorption capacity of the deteriorated adsorbent can be recovered.

  In the method of adding or mixing the photocatalyst to the adsorbent in the above phenomenon 3, it is possible to decompose the organic matter in contact with the photocatalyst by irradiating light having a predetermined wavelength from a light source. This uses a light source including a wavelength that excites the photocatalyst to irradiate the photocatalyst with light and excites it, and oxidatively decomposes organic substances on the surface of the adsorbent by the strong oxidizing action of OH radicals generated on the excited photocatalyst surface. Thereby, the physical adsorption effect of the adsorbent can be maintained for a longer time.

(First embodiment)
Hereinafter, a speaker device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an internal schematic structure of the speaker device.

  In FIG. 1, the speaker device includes a cabinet 11, a speaker unit 12, and an adsorbing body 13. As shown in FIG. 1, the first embodiment is a bass reflex type speaker device.

  The cabinet 11 constitutes a front surface, a back surface, an upper surface, a lower surface, and left and right side surfaces of the speaker device housing, and forms a vacant space R of the speaker device therein. An opening is formed on the front surface of the cabinet 11. The cabinet 11 is made of a material that is partially or entirely transparent, such as acrylic or glass (in FIG. 1, the entire cabinet 11 is transparent), and can radiate light from the outside to the inside of the cabinet 11. The speaker unit 12 is an electrodynamic speaker and is attached to the front surface of the cabinet 11.

The adsorbent 13 is disposed inside the empty room R. Thereby, it can comprise so that light can be irradiated to the adsorption body 13 from the exterior of the cabinet 11. FIG. The adsorbent 13 is a porous material that physically adsorbs gas. The porous material can physically adsorb air with micro-sized pores. For example, the adsorbent 13 may be activated carbon, zeolite, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₃ ), magnesia (MgO), iron trioxide (Fe ₃ O ₄ ), molecular sieve, It is comprised from either fullerene and a carbon nanotube, or these combination. The combination here includes mixing different materials to form one adsorbent 13. Further, the method includes forming the plurality of adsorbent bodies 13 with a single material and different materials (that is, arranging a plurality of adsorbent bodies 13 formed with different materials). The adsorbent 13 disposed inside the vacant space R is most preferably activated carbon having the largest specific surface area and the large physical adsorption power among the porous materials described above.

  Next, the operation of the speaker device of this embodiment will be described. Since the operation of the speaker unit 12 which is an electrodynamic speaker is well known, detailed description thereof will be omitted here. However, when a music signal is applied to the speaker unit 12, a force is generated in the voice coil to vibrate the cone type diaphragm. Sound is generated. The sound pressure generated by this cone type diaphragm causes pressure fluctuations in the vacant chamber R in the cabinet 11. However, since the adsorbent 13 is disposed in the empty space R, the gas molecules in the empty space R are adsorbed / desorbed by the adsorbent 13 due to the gas adsorbing action of the adsorbent 13, and the pressure fluctuation in the empty space R is changed. As a result, the empty space R has an equivalently large volume. That is, the speaker device operates as if the speaker unit 12 is attached to the cabinet 11 having a large volume, and can reproduce a low frequency band with an increased internal volume. The above operation is almost the same as that of the conventional speaker device described in the background art.

  Here, when organic substances such as water vapor, acetaldehyde, and formaldehyde contained in the air enter the empty space R through the opening of the cabinet 11, they are attracted to the adsorbent 13 and cover the pores of the adsorbent 13. End up. As a result, the physical adsorption capability of the adsorbent 13 decreases with time. However, in the speaker device of the present embodiment, the cabinet 11 is made of a transparent material such as acrylic or glass, and the adsorbent 13 can be irradiated with light from the outside of the cabinet 11. By irradiating light (for example, sunlight, infrared rays from a halogen heater, etc.) to the adsorbent 13 from the outside through the transparent portion of the cabinet 11, the surface temperature of the adsorbent 13 is raised and water vapor or low attached to the surface is reduced. It is possible to recover the physical adsorption ability of the adsorbent 13 by desorbing boiling organic substances and the like.

  As a light source for irradiating the speaker device with light, an ultraviolet LED, a mercury lamp, a xenon lamp, or the like that generates less heat may be used in addition to the above-described sunlight or halogen heater. In the case of using a light source that becomes high temperature, it is preferable to irradiate light intermittently (for example, to irradiate the speaker device with light for a certain period of time after the power is turned off). , Metals, etc.) are preferably used. In addition, it is ideal that the speaker device is always irradiated for the purpose of recovery of the physical adsorption function of the adsorber 13, but it is intermittent in consideration of the energy required for the light source. Irradiation is acceptable.

  As described above, the speaker device according to the present embodiment can recover the physical adsorption function of the adsorption body 13 by irradiating the adsorption body 13 with light from the outside of the cabinet 11 for a predetermined time or more. It is possible to restore and maintain the reproduction capability of the bass band as the internal volume of the device increases.

  As shown in FIG. 1, the speaker device of this embodiment can be realized by using a bass-reflex cabinet 11, but various speaker devices using a sealed cabinet, a drone cone, a horn, etc. It is feasible.

  Further, as will be apparent from the second and third embodiments described later, a photocatalyst excited at the wavelength of light to be irradiated may be added to or mixed with the adsorbent 73 (porous material). The physical adsorption ability of the adsorbent 13 can be maintained by decomposing the organic matter attached to the porous material by the function of the photocatalyst to be added or mixed.

(Second Embodiment)
Hereinafter, a speaker device according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing an internal schematic structure of the speaker device.

  In FIG. 2, the speaker device includes a cabinet 21, a speaker unit 22, an adsorbent 23, and an LED light source 24. As shown in FIG. 2, the second embodiment is a bass reflex type speaker device.

  The cabinet 21 constitutes a front surface, a back surface, an upper surface, a lower surface, and left and right side surfaces of the speaker device housing, and forms a vacant space R of the speaker device therein. An opening is formed on the front surface of the cabinet 21. The speaker unit 22 is an electrodynamic speaker and is attached to the front surface of the cabinet 21.

The adsorbent 23 and the LED light source 24 are disposed inside the empty room R. The adsorbing body 23 is formed, for example, in a plate shape, and a plurality of adsorbing bodies 23 are arranged inside the empty room R in parallel. A plurality of LED light sources 24 are arranged inside the empty room R so as to irradiate light on both surfaces of the plurality of plate-like adsorbers 23. The adsorbent 23 is a porous material that physically adsorbs gas, and a photocatalyst is added to or mixed with the porous material. The porous material can physically adsorb air with micro-sized pores. For example, the porous material may be activated carbon, zeolite, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₃ ), magnesia (MgO), iron trioxide (Fe ₃ O ₄ ), molecular sieve, It is comprised from either fullerene and a carbon nanotube, or these combination. The combination of porous materials here also includes mixing different materials to form the porous material of one adsorbent 23. In addition, the porous material of the plurality of adsorbers 23 is formed of a single material and different materials. The porous material of the adsorbent 23 disposed inside the vacant space R is most preferably activated carbon having the largest specific surface area and the large physical adsorption power among the porous materials described above.

Photocatalysts added to or mixed with the porous material include titanium oxide (TiO ₂ ), niobium oxide (Nb ₂ O ₅ ), iron sesquioxide (Fe ₂ O ₃ ), zinc oxide (ZnO), and tungsten oxide (WO ₃ ), Tin oxide (SnO ₂ ), cadmium sulfide (CdS), zinc sulfide (ZnS), mercury sulfide (Ag ₂ S), strontium titanate (SrTiO ₃ ), or a combination thereof. The combination of photocatalysts herein includes mixing different materials and adding or mixing them into one porous material. Further, the method includes adding or mixing a plurality of photocatalysts with a single material and different porous materials.

  In the above description, a plurality of photocatalysts in which this embodiment can be implemented has been described. However, the photocatalyst used in this embodiment may be selected in consideration of chemical stability, efficiency as a photocatalyst, and reaction wavelength. For example, titanium oxide is preferable for addition to or mixing with the porous material because it is chemically stable (non-toxic and non-toxic) and has high photocatalytic efficiency. Zinc oxide is chemically unstable because it has high photocatalytic efficiency but dissolves in water. Furthermore, a photocatalyst is selected according to the wavelength of the light irradiated to the adsorbent 23. For example, general titanium oxide reacts only to light having a wavelength of 387 nm or less. Light in this wavelength band is included in sunlight at about 5%, but a general fluorescent lamp is included at about 1% and is hardly included in an incandescent bulb. Therefore, when titanium oxide is used for the photocatalyst, an ideal light source is preferably an ultraviolet light source including light in the above wavelength band. For example, when titanium oxide is used as the photocatalyst, an LED light source 24 that emits light having a wavelength at which the photocatalyst is excited is used, for example, an ultraviolet LED (wavelength = 254 nm) light source. In addition, since photocatalysts in which titanium oxide and zinc oxide are mixed have been developed that support visible light of 450 nm or less, this combined photocatalyst can perform a photocatalytic function even with a visible light source.

  With reference to FIG. 3 and FIG. 4, the adsorbent 23 obtained by adding or mixing a photocatalyst to a porous material will be described. FIG. 3 is a schematic cross-sectional view of the surface portion showing an example of the adsorbent 23 in which the photocatalyst 232 is added to the surface of the porous material 231. FIG. 4 is a schematic cross-sectional view of the surface portion showing an example of the adsorbent 23 in which the porous material 233 and the photocatalyst 234 are mixed.

  In FIG. 3, a porous material 231 and a photocatalyst 232 in which the vicinity of the surface of the adsorbent 23 (portion surrounded by a broken line in the drawing) is enlarged are shown. A large number of pores are formed on the surface of the porous material 231. The photocatalyst 232 has a particle size sufficiently larger than the pores that do not enter and close the pores of the porous material 231 so that the physical adsorption ability of the porous material 231 is not deteriorated. The photocatalyst 232 is fixed to the surface of the porous material 231 with a predetermined adhesive or the like. In FIG. 3, the massive porous material 231 is shown, but an aggregate of granular porous materials 231 may be used.

  In FIG. 4, a porous material 233 and a photocatalyst 234 in which the vicinity of the surface of the adsorbent 23 (portion surrounded by a broken line in the figure) is enlarged are shown. The porous material 233 and the photocatalyst 234 are each formed of particles, and the adsorbent 23 is configured by mixing the particles of the porous material 233 and the particles of the photocatalyst 234. At this time, the photocatalyst 234 having a particle size sufficiently larger than the pores (not shown) of the porous material 233 is used so as not to deteriorate the physical adsorption ability of the adsorbent 23. Note that the adsorbent 23 may be formed by integrally forming the particles of the porous material 233 and the particles of the photocatalyst 234 in a mixed state.

  Further, FIG. 2 shows an example in which the cabinet 21 and the adsorbent 23 are configured separately, but a material having the above-described photocatalytic function and physical adsorption function is formed at least in the inner direction (inner wall) of the cabinet 21. Alternatively, the cabinet 21 may be used, or the adsorbent 23 may be attached to the inner wall of the cabinet 21. The details of the structure constituting the adsorbent on the inner wall surface of the cabinet will be described later.

  Next, the operation of the speaker device of the present embodiment will be described with reference to FIG. Since the operation of the speaker unit 22 which is an electrodynamic speaker is well known, a detailed description thereof will be omitted here. However, when a music signal is applied to the speaker unit 22, a force is generated in the voice coil to vibrate the cone type diaphragm. Sound is generated. The sound pressure generated by this cone type diaphragm causes pressure fluctuations in the vacant chamber R in the cabinet 21. However, since the adsorbent 23 is disposed in the empty space R, the gas molecules in the empty space R are adsorbed / desorbed to the porous material of the adsorbent 23 by the gas adsorbing action of the adsorbent 23, and the empty space R The pressure fluctuation is suppressed, and the empty space R becomes an equivalently large volume. That is, the speaker device operates as if the speaker unit 22 is attached to the cabinet 21 having a large volume, and can reproduce a low frequency band with an increased internal volume. The above operation is almost the same as that of the conventional speaker device described in the background art.

  Here, when organic substances such as water vapor, acetaldehyde, and formaldehyde contained in the air enter the empty room R through the opening of the cabinet 21, they are attracted to the adsorbent 23 and cover the pores of the porous material. End up. As a result, the physical adsorption capability of the adsorbent 23 decreases with time. However, the speaker device of the present embodiment decomposes organic matter and the like attached to the porous material by the function of the photocatalyst by irradiating the adsorbent 23 including the photocatalyst with light from the LED light source 24 constantly or intermittently. Thus, the physical adsorption capacity of the adsorbent 23 can be maintained. As a result, in the speaker device that expands the bass reproduction band by using the physical adsorption capability of the adsorbent 23, it is possible to maintain the reproduction of the bass band whose internal volume is increased for a long period of time.

  The photocatalyst contained in the adsorbent 23 is made of a material that exhibits a photocatalytic action with visible light, and a fluorescent lamp or other visible light source that irradiates light in the visible light band to a light source disposed inside the speaker device. It doesn't matter. In addition, during the period in which the LED light source 24 irradiates light to the speaker device, it is ideal that the LED light source 24 emits light, although it is ideal that the LED light source 24 always irradiates in order to recover the physical adsorption function of the adsorbent 23. Therefore, it may be irradiated intermittently in consideration of energy required for this. As shown in FIG. 2, the speaker device according to the present embodiment can be realized using a bass-reflex cabinet 21. However, various speaker devices using a closed cabinet, a drone cone, a horn, or the like can be used. It is feasible.

(Third embodiment)
Hereinafter, a speaker device according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a cross-sectional view showing an internal schematic structure of the speaker device.

  In FIG. 5, the speaker device includes a cabinet 51, a speaker unit 52, an adsorbent 53, and a light source 54. As shown in FIG. 5, the third embodiment is a bass-reflex type speaker device.

  The cabinet 51 constitutes a front surface, a back surface, an upper surface, a lower surface, and left and right side surfaces of the speaker device housing, and forms an empty space R of the speaker device therein. An opening is formed on the front surface of the cabinet 51. The speaker unit 52 is an electrodynamic speaker and is attached to the front surface of the cabinet 51.

The adsorbent 53 and the light source 54 are arranged inside the empty room R. The adsorbing body 53 is formed, for example, in a plate shape, and a plurality of adsorbing bodies 53 are arranged in parallel in the empty room R as in the second embodiment. In addition, a plurality of light sources 54 are arranged inside the empty room R so as to irradiate light on both surfaces of the plurality of plate-like adsorbers 53. The light source 54 is at least one fluorescent tube or lamp light source provided in the empty room R. The light source 54 uses a light source that emits light at a wavelength at which a photocatalyst described later functions, and for example, an ultraviolet lamp. The adsorbent 53 is a porous material that physically adsorbs gas, and a photocatalyst is added to or mixed with the porous material. The porous material can physically adsorb air with micro-sized pores. For example, the porous material may be activated carbon, zeolite, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₃ ), magnesia (MgO), iron trioxide (Fe ₃ O ₄ ), molecular sieve, It is comprised from either fullerene and a carbon nanotube, or these combination. The combination of porous materials here also includes mixing different materials to form the porous material of one adsorbent 53. In addition, the porous material of the plurality of adsorbers 53 is formed of a single material and different materials. The porous material of the adsorbent 53 disposed inside the vacant space R is most preferably activated carbon having the largest specific surface area and the large physical adsorption power among the porous materials described above.

Photocatalysts added to or mixed with the porous material include titanium oxide (TiO ₂ ), niobium oxide (Nb ₂ O ₅ ), iron sesquioxide (Fe ₂ O ₃ ), zinc oxide (ZnO), and tungsten oxide (WO ₃ ), Tin oxide (SnO ₂ ), cadmium sulfide (CdS), zinc sulfide (ZnS), mercury sulfide (Ag ₂ S), strontium titanate (SrTiO ₃ ), or a combination thereof. The combination of photocatalysts herein includes mixing different materials and adding or mixing them into one porous material. Further, the method includes adding or mixing a plurality of photocatalysts with a single material and different porous materials. An example of the photocatalyst selection method and the addition and mixing of the photocatalyst are the same as those in the second embodiment, and thus detailed description thereof is omitted.

  Next, the operation of the speaker device of this embodiment will be described with reference to FIG. The operation of the speaker unit 52, which is an electrodynamic speaker, is well known and will not be described in detail here. However, when a music signal is applied to the speaker unit 52, a force is generated in the voice coil to vibrate the cone diaphragm. Sound is generated. The sound pressure generated by the cone type diaphragm causes a pressure fluctuation in the empty room R in the cabinet 51. However, since the adsorbent 53 is arranged in the empty chamber R, the gas molecules in the empty chamber R are adsorbed / desorbed by the porous material of the adsorbent 53 due to the gas adsorbing action of the adsorbent 53, so The pressure fluctuation is suppressed, and the empty space R becomes an equivalently large volume. That is, the speaker device operates as if the speaker unit 52 is attached to the cabinet 51 having a large volume, and can reproduce a low frequency band with an increased internal volume. The above operation is almost the same as that of the conventional speaker device described in the background art.

  Here, when organic substances such as water vapor, acetaldehyde, and formaldehyde contained in the air enter the empty space R through the opening of the cabinet 21, they are attracted to the adsorbent 53 and cover the pores of the porous material. End up. As a result, the physical adsorption capability of the adsorbent 53 decreases with time. However, the speaker device according to the present embodiment irradiates the adsorbent 53 including the photocatalyst with light from the light source 54 such as a fluorescent tube constantly or intermittently, so that the organic substance attached to the porous material by the function of the photocatalyst. Etc. can be decomposed to maintain the physical adsorption capacity of the adsorbent 53. As a result, in the speaker device that expands the bass reproduction band by using the physical adsorption capability of the adsorbent 53, it is possible to maintain the reproduction of the bass band whose internal volume is increased for a long period of time.

  The photocatalyst contained in the adsorbent 53 is made of a material that exhibits a photocatalytic action with visible light, and a fluorescent lamp or other visible light source that emits light in the visible light band to the light source 54 disposed inside the speaker device is used. It doesn't matter. In addition, during the period in which the light source 54 irradiates light to the speaker device, it is ideal that the light is always radiated in order to restore the physical adsorption function of the adsorbent 53, but the light source 54 irradiates light. Irradiation may be intermittent in consideration of necessary energy. Further, as shown in FIG. 5, the speaker device of the present embodiment can be realized using a bass-reflex type cabinet 51, but various speaker devices using a closed cabinet, a drone cone, a horn, etc. It is feasible.

(Fourth embodiment)
Hereinafter, a speaker device according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a cross-sectional view showing an internal schematic structure of the speaker device.

  In FIG. 6, the speaker device includes a cabinet 61, a speaker unit 62, an adsorbent 63, and a light source 64. As shown in FIG. 6, the fourth embodiment is a bass reflex type speaker device.

  The cabinet 61 constitutes a front surface, a back surface, an upper surface, a lower surface, and left and right side surfaces of the speaker device housing, and forms a vacant space R of the speaker device therein. An opening is formed in the front surface of the cabinet 61. The speaker unit 62 is an electrodynamic speaker and is attached to the front surface of the cabinet 61.

The adsorbent 63 is installed inside the empty room R that is the inner wall surface of the cabinet 61. In the example of FIG. 6, the adsorbent 63 is installed along the inner wall surface of the cabinet 61 that is the back surface, top surface, bottom surface, and left and right side surfaces of the speaker device housing. At least one light source 64 is arranged in the empty room R so as to irradiate light from the central position in the empty room R to the main surface of the adsorbent 63 installed on the inner wall surface. The light source 54 is a light source that emits heat, for example, an incandescent bulb. The adsorbent 63 is a porous material that physically adsorbs gas. The porous material can physically adsorb air with micro-sized pores. For example, the adsorbent 63 may be activated carbon, zeolite, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₃ ), magnesia (MgO), iron trioxide (Fe ₃ O ₄ ), molecular sieve, It is comprised from either fullerene and a carbon nanotube, or these combination. The combination of the adsorbents 63 here includes mixing different materials to form one adsorbent 63. Further, the method includes forming the plurality of adsorbers 63 with a single material and different materials. The adsorbent 53 disposed inside the vacant space R is most preferably activated carbon having the largest specific surface area and the large physical adsorption power among the porous materials described above.

  Next, the operation of the speaker device of this embodiment will be described. The operation of the speaker unit 62, which is an electrodynamic speaker, is well known and will not be described in detail here. However, when a music signal is applied to the speaker unit 62, a force is generated in the voice coil to vibrate the cone diaphragm. Sound is generated. The sound pressure generated by this cone type diaphragm causes pressure fluctuations in the vacant chamber R in the cabinet 61. However, since the adsorbent 63 is disposed on the inner wall surface of the empty room R, the gas molecules in the empty room R are adsorbed / desorbed by the adsorbent 63 due to the gas adsorbing action of the adsorbent 63, so The pressure fluctuation is suppressed, and the empty space R becomes an equivalently large volume. That is, the speaker device operates as if the speaker unit 62 is attached to the cabinet 61 with a large volume, and can reproduce a low frequency band with an increased internal volume. The above operation is almost the same as that of the conventional speaker device described in the background art.

  Here, when organic substances such as water vapor, acetaldehyde, and formaldehyde contained in the air enter the empty space R through the opening of the cabinet 61, they are attracted to the adsorbent 63 and cover the pores of the porous material. End up. As a result, the physical adsorption capability of the adsorbent 63 decreases with time. However, in the speaker device of this embodiment, when the light source 64 is turned on, the light source 64 itself generates heat, the temperature in the vacant room R rises, and the temperature of the adsorbent 63 is increased by heating with the light emitted from the light source 64. Rises. As a result, water vapor, low-boiling organic substances, etc. adhering to the surface of the adsorbent 63 are desorbed, and the physical adsorption capacity of the adsorbent 63 can be recovered. That is, when the light source 64 irradiates light for a predetermined time, the organic matter adhering to the porous material is desorbed, and the physical adsorption ability of the adsorbent 63 can be maintained. As a result, in the speaker device that expands the bass reproduction band by using the physical adsorption capability of the adsorbent 63, it is possible to maintain the reproduction of the bass band whose internal volume is increased for a long period of time.

  Note that a breathable mesh-like material with high thermal conductivity (for example, metal) covers the inner surface of the adsorbent 63 installed on the inner wall surface of the cabinet 61, or a material with high thermal conductivity is applied to the cabinet 61. It may be interposed between the inner wall and the adsorbent 63. Accordingly, the heat from the light source 64 can be distributed to the adsorbent 63 more uniformly and quickly.

  It should be noted that during the period in which the light source 64 irradiates light to the speaker device, it is ideal to always irradiate in order to recover the physical adsorption function of the adsorbent 63, but intermittently because the temperature inside the speaker device becomes high. Irradiation may be possible. Further, it is preferable to use a heat-resistant material (heat-resistant plastic, metal, etc.) for the cabinet 61 and the like, assuming that the inside of the speaker device is at a high temperature. Further, as shown in FIG. 6, the speaker device of the present embodiment can be realized using a bass-reflex type cabinet 21, but various speaker devices using a closed cabinet, a drone cone, a horn, etc. It is feasible. Moreover, it is good also as a structure using the light source 64 which irradiates the light which has a wavelength which adds or mixes a photocatalyst to the adsorbent 63 (porous material), and excites a photocatalyst similarly to the 2nd and 3rd embodiment.

(Fifth embodiment)
Hereinafter, a speaker device according to a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a cross-sectional view showing a schematic internal structure of the speaker device.

  In FIG. 7, the speaker device includes a cabinet 71, a speaker unit 72, an adsorbent 73, a light source 74, and a mirror 75. As shown in FIG. 7, the fifth embodiment is a bass reflex type speaker device.

  The cabinet 71 constitutes a front surface, a back surface, an upper surface, a lower surface, and left and right side surfaces of the speaker device housing, and forms an empty space R of the speaker device therein. An opening is formed on the front surface of the cabinet 71. The cabinet 71 is made of a material that is partially or entirely transparent such as acrylic or glass (a material in which the upper surface 71t of the cabinet 71 is transparent in FIG. 7), and can irradiate light from the outside to the inside of the cabinet 71. The speaker unit 72 is an electrodynamic speaker and is attached to the front surface of the cabinet 71.

  The light source 74 is installed outside the empty room R outside the cabinet 71, and is provided so as to irradiate light into the empty room R through an upper surface 71t formed of a transparent material. For example, the light source 74 uses various light sources such as a halogen heater, a light bulb type, a fluorescent tube type, an LED type, and a surface light emitter. The light source 74 may also serve as illumination for visual effects provided in the speaker device. The mirror 75 is provided in the empty room R, reflects the light emitted from the light source 74 and efficiently spreads the surface of the adsorbent 73 described later.

The adsorbent 73 is disposed inside the empty room R. The adsorbing body 73 is formed, for example, in a plate shape, and a plurality of adsorbing bodies 73 are arranged inside the empty room R in parallel. And it installs so that the light from the light source 74 can irradiate the some plate-shaped adsorption body 73 via the upper surface 71t. The adsorbent 73 is a porous material that physically adsorbs gas. The porous material can physically adsorb air with micro-sized pores. For example, the adsorbent 73 may be activated carbon, zeolite, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₃ ), magnesia (MgO), iron trioxide (Fe ₃ O ₄ ), molecular sieve, It is comprised from either fullerene and a carbon nanotube, or these combination. The combination of the adsorbents 73 here includes mixing different materials to form one adsorbent 73. Further, the method includes forming the plurality of adsorbers 73 with a single material and different materials. The adsorbent 73 disposed in the interior of the vacancy R is most preferably activated carbon having the largest specific surface area and the large physical adsorption power among the porous materials described above.

  Next, the operation of the speaker device of this embodiment will be described. The operation of the speaker unit 72, which is an electrodynamic speaker, is well known and will not be described in detail here. However, when a music signal is applied to the speaker unit 72, a force is generated in the voice coil to vibrate the cone diaphragm. Sound is generated. The sound pressure generated by the cone type diaphragm causes a pressure fluctuation in the empty room R in the cabinet 71. However, since the adsorbent 73 is disposed in the empty chamber R, the gas molecules in the empty chamber R are adsorbed / desorbed by the adsorbent 73 due to the gas adsorbing action of the adsorbent 73, and the pressure fluctuation in the empty chamber R is changed. Is suppressed, and the vacancy R has an equivalently large volume. That is, the speaker device operates as if the speaker unit 72 is attached to the cabinet 71 having a large volume, and can reproduce a low frequency band with an increased internal volume. The above operation is almost the same as that of the conventional speaker device described in the background art.

  Here, when organic substances such as water vapor, acetaldehyde, and formaldehyde contained in the air enter the empty space R through the opening of the cabinet 71, they are attracted to the adsorbent 73 and cover the pores of the porous material. End up. As a result, the physical adsorption capability of the adsorbent 73 decreases with time. However, in the speaker device of this embodiment, when the light source 74 is turned on, light is irradiated from the light source 64 to the adsorbent 73 through the upper surface 71t, and the temperature of the adsorbent 73 rises. As a result, water vapor and low-boiling organic substances adhering to the surface of the adsorbent 73 are desorbed, and the physical adsorption capacity of the adsorbent 73 can be recovered. That is, when the light source 74 irradiates light for a predetermined time, an organic substance or the like attached to the porous material is desorbed, and the physical adsorption ability of the adsorbent 73 can be maintained. As a result, in the speaker device that expands the bass reproduction band by using the physical adsorption capability of the adsorbent 73, it is possible to maintain the reproduction of the bass band with an increased internal volume for a long period of time.

  It should be noted that during the period in which the light source 74 irradiates light to the speaker device, it is ideal to always irradiate in order to restore the physical adsorption function of the adsorbent 73, but intermittently because the temperature inside the speaker device becomes high. Irradiation may be possible. Further, it is preferable to use a heat-resistant material (heat resistant plastic, metal, etc.) for the cabinet 71 and the like, assuming that the inside of the speaker device is at a high temperature. Further, as shown in FIG. 7, the speaker device of the present embodiment can be realized using a bass-reflex type cabinet 21, but various speaker devices using a sealed cabinet, a drone cone, a horn, etc. It is feasible. Moreover, it is good also as a structure using the light source 74 which irradiates the light which has a wavelength which adds or mixes a photocatalyst to the adsorbent 73 (porous material) similarly to 2nd and 3rd embodiment, and excites a photocatalyst.

  The speaker device according to the present invention is useful as a speaker device that reproduces a low frequency band whose internal volume is increased by using an adsorbent installed inside a speaker cabinet.

Sectional drawing which shows the internal schematic structure of the speaker apparatus which concerns on the 1st Embodiment of this invention. Sectional drawing which shows the internal schematic structure of the speaker apparatus which concerns on the 2nd Embodiment of this invention. Schematic sectional view of a surface portion showing an example of an adsorbent 23 in which a photocatalyst 232 is added to the surface of a porous material 231 Schematic sectional view of a surface portion showing an example of an adsorbent 23 in which a porous material 233 and a photocatalyst 234 are mixed Sectional drawing which shows the internal schematic structure of the speaker apparatus which concerns on the 3rd Embodiment of this invention. Sectional drawing which shows the internal schematic structure of the speaker apparatus which concerns on the 4th Embodiment of this invention. Sectional drawing which shows the internal schematic structure of the speaker apparatus which concerns on the 5th Embodiment of this invention. Sectional drawing which shows the internal schematic structure of the conventional speaker apparatus

Explanation of symbols

11, 21, 51, 61, 71 ... Cabinet 12, 22, 52, 62, 72 ... Speaker units 13, 23, 53, 63, 73 ... Adsorbents 231, 233 ... Porous material 232, 234 ... Photocatalyst 24 ... LED Light source 54, 64, 74 ... Light source 75 ... Mirror

Claims (8)

Cabinet,
A speaker unit attached to the cabinet;
It is arranged in an empty space inside the cabinet, and comprises an adsorbent that physically adsorbs gas,
The speaker device, wherein the adsorbent is arranged so that at least a part thereof is irradiated with light. The cabinet is at least partially formed of a transparent member,
The speaker device according to claim 1, wherein the adsorbent is arranged so that light is irradiated from outside the cabinet through a cabinet formed of the transparent member.   The speaker device according to claim 2, further comprising a light source that is fixed to the outside of the cabinet and irradiates the adsorbent with light through a cabinet formed of the transparent member.   The speaker device according to claim 1, further comprising a light source fixed inside the cabinet and irradiating the adsorbent with light. The adsorbent is activated carbon, zeolite, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zirconia (ZrO ₃ ), magnesia (MgO), triiron tetroxide (Fe ₃ O ₄ ), molecular sieve, fullerene, The speaker device according to claim 1, wherein the speaker device is composed of at least one selected from the group of porous materials made of carbon nanotubes. The adsorbent is
A porous material that physically adsorbs gas;
The speaker device according to claim 1, further comprising a photocatalyst added to or mixed with the porous material. The photocatalyst is composed of titanium oxide (TiO ₂ ), niobium oxide (Nb ₂ O ₅ ), iron sesquioxide (Fe ₂ O ₃ ), zinc oxide (ZnO), tungsten oxide (WO ₃ ), tin oxide (SnO ₂ ), The at least one selected from the group consisting of cadmium sulfide (CdS), zinc sulfide (ZnS), mercury sulfide (Ag ₂ S), and strontium titanate (SrTiO ₃ ). Speaker device. The speaker device according to claim 6, wherein the photocatalyst is activated in response to a wavelength of light applied to the adsorbent.

Images