JP2007318611A - Member for speaker, and speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a member for a speaker that makes the difference between when it is on off conspicuous, and has excellent luminescence properties. <P>SOLUTION: The member for the speaker has a first external layer, an intermediate layer having a punched section in a prescribed shape, and a second external layer. The first and second external layers and the intermediate layer are impregnated with a thermosetting resin. At least one of the first and second external layers contains a fluorescent pigment. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker member and a speaker. More specifically, the present invention relates to a speaker member and a speaker that have excellent luminous properties and excellent design.

  A speaker diaphragm that is one of the members for a speaker is generally required to be lightweight, highly rigid, and have high internal loss. In addition to these, a speaker diaphragm for in-vehicle use is required to have excellent appearance and design.

Therefore, a speaker has been proposed in which a light source is disposed on the back side of a diaphragm made of a translucent film, and the intensity of the light source is changed according to the sound volume to adjust the irradiation intensity of the entire diaphragm (see Patent Document 1). . However, since such a speaker has a diaphragm made of a light-transmitting film, the design characteristics when not irradiated (when the light source is not emitting light) are extremely insufficient. Furthermore, since such a speaker simply reflects the light emission of the light source, the difference in design between the light emission time and the non-light emission time is not significant, and the commercial value is low.
JP 2004-7308 A

  The present invention has been made in order to solve the above-described conventional problems. The object of the present invention is to distinguish a difference in designability between light emission and non-light emission (hereinafter referred to as on-off difference). An object of the present invention is to provide a speaker member and a speaker that are standing and excellent in luminous properties.

  The speaker member of the present invention includes a first outer layer, an intermediate layer having a punched portion having a predetermined shape, and a second outer layer, and the first outer layer, the intermediate layer, and the second outer layer. Is impregnated with a thermosetting resin. At least one of the first outer layer and the second outer layer includes a fluorescent pigment.

  In a preferred embodiment, the first outer layer, the intermediate layer, and the second outer layer are arranged in this order toward the sound emission side.

  In a preferred embodiment, the thermosetting resin contains the fluorescent pigment. In a preferred embodiment, the fluorescent pigment has an average particle size of 1 μm or less.

  In a preferred embodiment, the second outer layer comprises a twill woven fabric. In a preferred embodiment, the second outer layer includes a woven fabric made of untwisted fibers.

  According to another aspect of the present invention, a speaker is provided. The speaker includes the speaker member and a light source disposed on the back side of the speaker member.

  According to the present invention, by providing the first outer layer and / or the second outer layer containing a fluorescent pigment, it is possible to obtain a speaker member and a speaker that make an on-off difference stand out and are excellent in luminous properties. As a result, a speaker member and a speaker excellent in design can be obtained. In a preferred embodiment, the impregnated thermosetting resin also contains the fluorescent pigment. As a result, the on / off difference and the light emission can be further improved.

  Hereinafter, although preferable embodiment of this invention is described, this invention is not limited to these embodiment.

  FIG. 1A is a schematic diagram of a speaker 100 according to a preferred embodiment of the present invention, and FIG. 1B is an enlarged cross-sectional view of a portion X in FIG. The speaker 100 includes a speaker member 10 and a light source 20. In the illustrated example, the speaker member 10 is a diaphragm, but the present invention is also applicable to other speaker members (for example, dust caps) that can contribute to design and light emission. Each will be described below. For the sake of simplicity, only the diaphragm as the speaker member will be described.

A. Speaker diaphragm A-1. Overall Configuration of Speaker Diaphragm The speaker diaphragm 10 has a first outer layer 11, an intermediate layer 12, and a second outer layer 13. In one embodiment, as shown in FIG.1 (b), the 1st outer layer 11, the intermediate | middle layer 12, and the 2nd outer layer 13 are arrange | positioned in this order toward the sound emission side. The first outer layer 11, the intermediate layer 12, and the second outer layer 13 are impregnated with a thermosetting resin. At least one of the first outer layer 11 and the second outer layer 13 includes a fluorescent pigment. Preferably, both the first outer layer 11 and the second outer layer 13 include a fluorescent pigment.

  Any appropriate thermosetting resin can be adopted as the thermosetting resin. Preferred are unsaturated polyester resins, phenol resins and epoxy resins, and particularly preferred are unsaturated polyester resins. This is because the unsaturated polyester resin has a high curing speed and a low curing temperature, so that it can be easily produced and a speaker diaphragm having excellent internal loss can be obtained.

  The fiber / resin ratio of the diaphragm is preferably in the range of 20/80 to 80/20, more preferably in the range of 50/50 to 70/30. By adopting a fiber / resin ratio in such a range, a speaker diaphragm having an extremely excellent internal loss can be obtained without lowering the Young's modulus. Moreover, generation | occurrence | production of the resin specific sound can be prevented. Here, the “fiber / resin ratio” is a ratio between the weight of the diaphragm before impregnation and the weight of the impregnation resin.

A-1. Fluorescent Pigment The fluorescent pigment may be an organic fluorescent pigment or an inorganic fluorescent pigment, and any appropriate fluorescent pigment can be adopted depending on the purpose.

  Examples of the organic fluorescent pigment include resin particles containing a fluorescent dye. Any appropriate fluorescent dye can be adopted as the fluorescent dye. Specific examples include basic dyes, acid dyes, disperse dyes, oil-soluble dyes, fluorescent whitening dyes, and the like. Arbitrary appropriate resin can be employ | adopted as resin which forms a resin particle. Specific examples include acrylic resins, melamine resins, urethane resins, and polyester resins.

Examples of the inorganic fluorescent pigment include particles containing a base material and an activator. Any appropriate material can be adopted as the base material. Specific examples include oxides such as Y ₂ O ₃ and La ₂ O ₃ ; fluorides such as CaF ₂ ; sulfides such as ZnS; oxysulfides such as Y ₂ O ₂ S; Zn ₂ SiO ₄ , CaSiO ₃ , Silicates such as BaSi ₂ O ₅ and Y ₂ SiO ₅ ; phosphates such as YPO ₄ and Ca ₃ (PO ₄ ) ₂ ; tungstates such as CaWO ₄ and MgWO ₄ ; YAlO ₃ and Y ₃ Al ₅ O ₁₂ , aluminates such as SrAl ₂ O ₄ and Sr ₄ Al ₁₄ O ₂₅ ; titanates such as CaTiO ₃ and Y ₂ Ti ₂ O ₇ ; zirconates such as CaZrO ₃ ; molybdates such as CaMoO ₄ ; Examples thereof include sulfates such as CaSO ₄ ; borates such as InBO ₃ ; gallates such as MgGa ₂ O _{4, and the} like. Any appropriate material can be adopted as the activator. Specific examples include rare earth elements such as Eu, and heavy metals such as Mn, Sb, Ti, Zn, Pb, and Cr.

  The average particle diameter of the fluorescent pigment is preferably 1 μm or less, more preferably 0.01 to 0.8 μm, and particularly preferably 0.05 to 0.5 μm. When the average particle diameter is in such a range, the fluorescence of the first outer layer is hardly clearly seen when light is not irradiated from a light source described later. As a result, the on / off difference can be highlighted.

  Any appropriate method can be adopted as a method of incorporating the fluorescent pigment into the first outer layer and / or the second outer layer. Specific examples include a method of applying the dispersion containing the fluorescent pigment to the first outer layer and / or the second outer layer, and a method of immersing the first outer layer and / or the second outer layer in the dispersion. It is done. The dispersion can include any suitable dispersion solvent depending on the fluorescent pigment used. Examples of the dispersion solvent include water and organic solvents such as alcohol. Furthermore, the dispersion may contain any suitable additive as required.

  In one embodiment, the fluorescent pigment may be contained in the thermosetting resin. By including a fluorescent pigment in the thermosetting resin, the light emission of the diaphragm can be further improved in combination with the fluorescent pigment of the first outer layer and / or the second outer layer. When the thermosetting resin contains a fluorescent pigment, the concentration of the fluorescent pigment is preferably 3 to 10 parts by weight with respect to 100 parts by weight of the thermosetting resin.

A-2. First outer layer The first outer layer comprises any suitable woven and / or non-woven fabric. The first outer layer may be a single layer of woven fabric or nonwoven fabric, or may be a laminate of woven fabric and / or nonwoven fabric. Specific examples of the woven fabric and the nonwoven fabric include cotton woven fabric, silk woven fabric, hemp woven fabric, and rayon woven fabric. A cotton woven fabric is preferable. This is because it is easily available and easy to process with the fluorescent pigment. The first outer layer is preferably a single layer of woven fabric. This is because the treatment with the fluorescent pigment exhibits significantly excellent light-emitting properties and can contribute to the reduction in thickness of the diaphragm. The weaving density of the woven fabric, the woven structure, the basis weight of the non-woven fabric, the thickness of the fibers constituting the woven fabric or non-woven fabric, and the like can be appropriately set according to the desired mechanical characteristics and appearance of the diaphragm. . For example, when the first outer layer is a single layer of cotton woven fabric, the weave density is preferably 100 to 150 g / m ² and the woven structure is preferably a plain weave.

  As described above, in the present invention, the first outer layer 11 can include a fluorescent pigment. The amount of the fluorescent pigment in the first outer layer can be appropriately set according to the purpose. For example, the fluorescent pigment can be used in a proportion of preferably 0.01 to 5.0 parts by weight with respect to 100 parts by weight of the first outer layer before impregnation. A commercially available white cotton woven fabric can also be used as the first outer layer containing a fluorescent pigment.

A-3. Intermediate Layer The intermediate layer 12 has a punched portion having a predetermined shape. The shape of the punched portion can be appropriately selected according to the purpose. Specific examples include characters, patterns, pictures, designs, marks, and trademarks. By providing the punched portion, light from the light source is transmitted through the punched portion, and the transmitted light is transmitted through the first outer layer and / or the second outer layer, and in one embodiment, a fluorescent pigment of an impregnated thermosetting resin. To emit light. As a result, a desired character, pattern or the like according to the purpose emits light, and a speaker diaphragm having a very excellent design can be obtained.

  As a material constituting the intermediate layer, any appropriate material can be used as long as it can be punched and has a mechanical strength (self-supporting property) of an appropriate shape retaining property after punching. Furthermore, from the viewpoint of conspicuous on-off difference, a material excellent in light blocking property is preferable. Specific examples of the material include canvas and cotton.

  If necessary, a metal layer may be formed on the surface of the intermediate layer. By forming the metal layer, the light emission luminance can be further improved. Any appropriate metal can be adopted as the metal forming the metal layer. Specific examples include metal films such as Ti, TiN, SUS, Ni, and Al. Any appropriate method can be adopted as a method for forming the metal layer. Specific examples include vapor deposition and sputtering.

A-4. Second outer layer The second outer layer also comprises any suitable woven and / or non-woven fabric. The second outer layer may be a single layer of woven or non-woven fabric, or may be a laminate of woven and / or non-woven fabric. A single layer of woven fabric is preferred. This is because the woven structure of the woven fabric has an excellent appearance and can contribute to a reduction in the thickness of the diaphragm.

Any appropriate structure (for example, plain weave, twill weave, satin weave, or a combination thereof) can be adopted as the weave structure of the woven fabric. A twill weave is preferred. This is because it is excellent in strength and elongation and has a high woven density. As a result, a speaker diaphragm superior in balance between Young's modulus and internal loss can be obtained. Furthermore, since the twill weave has a glossy fiber pattern, the design at the time of light emission can be improved. In the case of twill weave, the weave density (weight per unit area) is preferably 150 to 400 g / m ² , more preferably 280 to 350 g / m ² . This is because if the weaving density is less than 150 g / m ² , the fibers are rubbed by vibration, and as a result, unnecessary sound may be generated.

Preferably, the fibers constituting the woven fabric are untwisted fibers (untwisted fibers). By using non-twisted fibers, the thickness per unit weight can be extremely reduced, and as a result, a diaphragm having a light weight and extremely excellent strength can be obtained. For example, ordinary thermoplastic resin fibers are twisted, and the thickness of the woven fabric is about 1 mm when the basis weight is about 170 g / m ² , but plain weave of untwisted polyethylene naphthalate (PEN) fibers. The cloth has the same basis weight thickness of about 0.18 mm and a thickness of less than one fifth. Further, the woven fabric made of untwisted fibers has a remarkable gloss of the fibers, and the luminance increases when the woven fabric itself is exposed to ultraviolet rays, so that the light emitting property can be improved.

  The fiber may have any appropriate thickness depending on the purpose, but is preferably 800 to 1400 dtex. When the fiber thickness is less than 800 dtex, the fabric weight is often lowered and the strength is insufficient. When the fiber thickness exceeds 1400 dtex, the weight increases, and as a result, the sound pressure often decreases. Any appropriate material can be adopted as the material of the fiber. Preferably, a fiber obtained by fiberizing a transparent resin such as polyethylene naphthalate (PEN), polyethylene terephthalate (PET), acrylic, or nylon. PEN is particularly preferable from the viewpoint of heat resistance and strength.

  As described above, in the present invention, the second outer layer 13 may also include a fluorescent pigment. The amount of the fluorescent pigment in the second outer layer can be appropriately set according to the purpose. For example, the fluorescent pigment can be used in a proportion of preferably 0.01 to 5.0 parts by weight with respect to 100 parts by weight of the second outer layer before impregnation.

B. Light Source As shown in FIG. 1A, the light source 20 is disposed on the back side of the speaker diaphragm 10. When light from the light source 20 passes through the punched portion of the intermediate layer 12, characters, patterns, and the like corresponding to the shape of the punched portion become fluorescent in the first outer layer and / or the second outer layer or the impregnated thermosetting resin. Luminous light is emitted by the pigment (typically blue-white light), and a speaker having excellent light-emitting properties, visibility, and design is obtained. In the illustrated example, the light source is provided only at one place in the center portion on the back side, but the location and number of the light sources are not particularly limited as long as they appropriately pass through the punched portion of the intermediate layer.

  Any appropriate light source can be adopted as the light source as long as the fluorescent pigment can emit light. Preferably, it is a light source which can irradiate ultraviolet rays (especially near ultraviolet light whose wavelength is 300-400 nm). Specific examples include a black light fluorescent lamp and an ultraviolet light emitting diode (UV-LED).

  The on / off of the light source can be controlled by any appropriate method. Preferably, ON / OFF can be controlled with a predetermined volume as a boundary. With such a configuration, the sound volume and the timing of light emission can be matched, and the dynamic feeling of the sound can be appealed visually.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited by these Examples. Unless otherwise indicated, parts and percentages in the examples are based on weight.

(Preparation of unsaturated polyester resin composition)
A thermosetting resin composition having the following composition was prepared.
Unsaturated polyester resin (Nippon Shokubai Co., Ltd., N350L) 100 parts Low shrinkage agent (Nippon Yushi Co., Ltd., Modiper S501) 5 parts Curing agent (Nippon Yushi Co., Ltd., Perocta O) 1.3 parts

(Production of diaphragm)
White cotton woven fabric (manufactured by Teijin Ltd., cotton fiber count: 20 count, number of driven: 40 vertical x 40 horizontal, basis weight: 110 g / m ² ), No. 11 canvas punched with the word “Take”, and PEN Untwisted twill woven fabric (manufactured by NI Teijin Shoji Co., Ltd., fiber thickness: 1100 dtex, weaving density: 42 × 28 (lines / inch), basis weight: 322 g / m ² ) was cut into 30 cm × 30 cm. Cut cotton woven fabric, canvas and PEN fiber woven fabric were laminated in this order to form a substrate. The white cotton woven fabric and the PEN woven fabric are both fluorescent pigments as a whitening agent (manufactured by Nagase Sangyo Co., Ltd., UVITEX® OB, 2,5-bis [5-t-butylbenzoxazolyl (2 )] Thiophene) was used.
A jig having a circular hole with a diameter of about 30 cm in the center of a stainless plate of about 30 cm × about 30 cm is used as a clamp. The laminated base material is sandwiched between the two clamps, and the unsaturated polyester resin composition is formed in the center. About 5 g of the product was added dropwise. This substrate was press-molded at 130 ° C. for 30 seconds at a pressure of 1 to 3 MPa using a diaphragm-shaped matched die mold to obtain a speaker diaphragm having a diameter of 30 cm and a thickness of 0.6 cm.

(Speaker production)
The obtained speaker diaphragm was assembled in an enclosure and wired to produce a speaker. At that time, an ultraviolet light emitting diode (UV-LED) (manufactured by SANDER, trade name: SDL-5N3CUV-A) was disposed on the back side of the central portion of the speaker diaphragm to obtain a speaker as shown in FIG. The black light was controlled to turn on when the audio signal became 1.6 V or higher.
When music was played back using this speaker, the speaker diaphragm emitted light in conjunction with the audio signal, and the letters in the punched portion of the intermediate layer emerged, and the design was extremely excellent. Further, when no light was emitted (when no audio signal was applied and when an audio signal below the threshold was applied), the letters in the punched-out portion were not recognized at all, and the speaker diaphragm was very conspicuous. The state when the speaker is not emitting light is shown in FIG. 2, and the state when emitting light is shown in FIG.

Fluorescent pigment (SF-5000, manufactured by Sinloihi Co., Ltd., apparent density: 0.5 to 3.5 g / cm ³ , average particle size: 0.1 to 0.4 μm, excitation wavelength: 100 parts of unsaturated polyester resin 140 to 400 nm) A speaker diaphragm and a speaker were produced in the same manner as in Example 1 except that 5 parts were further contained.
When music was played back using this speaker, the speaker diaphragm emitted light in conjunction with the audio signal, and the letters in the punched portion of the intermediate layer emerged, and the design was extremely excellent. Further, when no light was emitted (when no audio signal was applied and when an audio signal below the threshold was applied), the letters in the punched-out portion were not recognized at all, and the speaker diaphragm was very conspicuous.

  The speaker member of the present invention is excellent in design and can be suitably used for a speaker for any application. In particular, it can be suitably used for in-vehicle use.

(A) is the schematic of preferable embodiment of the speaker of this invention, (b) is an expanded sectional view of the X section in (a). It is a photograph which shows the state at the time of the non-light emission of the speaker of Example 1. It is a photograph which shows the state at the time of sound emission of the speaker of Example 1.

Claims (7)

A first outer layer; an intermediate layer having a punched portion of a predetermined shape; and a second outer layer, wherein the first outer layer, the intermediate layer, and the second outer layer are impregnated with a thermosetting resin. And
A speaker member, wherein at least one of the first outer layer and the second outer layer contains a fluorescent pigment.   The speaker member according to claim 1, wherein the first outer layer, the intermediate layer, and the second outer layer are arranged in this order toward the sound emission side.   The speaker member according to claim 1, wherein the thermosetting resin contains the fluorescent pigment.   The speaker member according to claim 1, wherein the fluorescent pigment has an average particle diameter of 1 μm or less.   The member for a speaker according to any one of claims 1 to 4, wherein the second outer layer includes a twill woven fabric.   The member for a speaker according to any one of claims 1 to 5, wherein the second outer layer includes a woven fabric made of untwisted fibers. A speaker, comprising: the speaker member according to claim 1; and a light source disposed on a back side of the speaker member.