Photochromic sound cone and loudspeaker comprising same

Abstract

The utility model provides a photochromic sound cone and a loudspeaker comprising the same. The photochromic sound cone comprises a cone base material, an isolation layer, a reversible photochromic layer and a protection layer which are arranged in sequence. Through the design of the hierarchical structure and the combined action of the hierarchical structure, the photochromic sound cone has a photoresponse discoloration characteristic, can change color under the irradiation of sunlight or ultraviolet light, is high in discoloration response speed and reversible in discoloration performance, and meets diversified appearance requirements. Meanwhile, the photochromic sound cone is uniform and stable in color developing and color changing effect, good in ultraviolet aging resistance, high in modulus, strength and rigidity, excellent in mechanical property, acoustic property, sensitivity and tone quality effect, good in stability and durability, low in cost, capable of meeting different requirements and good in applicability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to loudspeaker technical field, concretely relates to a photochromic cone and the loudspeaker including it. BACKGROUND

[0002] The loudspeaker is mainly composed of a vibration system, a magnetic circuit system and a support system, wherein the vibration system is the core part, which converts electrical energy into mechanical vibration and then drives the air to produce sound. The cone is an important vibration component in the vibration system, and its properties directly affect the stability, service life and high and low frequency characteristics of the loudspeaker. The cone can be divided into paper cone, metal cone, ceramic cone, polypropylene (PP) cone and composite cone according to the material, wherein the paper cone has the characteristics of low cost, natural tone and good processability, and has very wide application. The appearance of the traditional loudspeaker cone product is relatively single, the color is usually black, and the function is relatively limited. In recent years, with the growing demand for personalized and intelligent products, paper cone products with special appearance have gradually attracted people's attention.

[0003] At present, the realization methods of the appearance color of the loudspeaker cone mainly include: (1) paint spraying: it is the most commonly used method, which sprays paint on the surface of the cone to realize various colors and patterns; (2) printing: the patterns or characters are printed on the surface of the cone to obtain more complex patterns; (3) film covering: the film with pre-coated color is pasted on the surface of the cone to realize smoother appearance and stronger wear resistance; (4) anodic oxidation: this method is mainly aimed at metal cone, for example, forming an oxide film on the surface of aluminum cone to realize gold color, silver color and other colors.

[0004] The traditional cone can only meet the basic needs in function, and it is difficult to provide additional visual effects or other added values. With the development of technology and the performance of product diversification, the cone with special visual effect becomes a new development direction, for example, the color-changing cone has higher visual attraction and stronger functionality, which can provide users with more personalized and intelligent choices, meet the demand of people for personalized and intelligent products, and at the same time, can expand the application range of the cone product, such as being used in the field of smart home and automotive interior. However, in the prior art, the cone with special visual effect generally has the problems of high cost, complex preparation process and insufficient stability, and the preparation of special appearance is often accompanied by the reduction of the mechanical properties and acoustic properties of the cone, which affects the sound production effect of the loudspeaker. Therefore, it is an urgent problem in the field to develop a more economical color-changing cone with good stability, mechanical properties and acoustic properties. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of the prior art, the utility model discloses a photochromic sound basin and a loudspeaker comprising the same, through the design of the multilayer structure and the mutual action, the photochromic sound basin has the photoresponsive discoloration characteristic, and the discoloration effect is reversible, can increase product attraction, and expands the application range.

[0006] In order to achieve the utility model purposes, the utility model adopts the following technical scheme:

[0007] In the first aspect, the utility model provides a photochromic sound basin, the photochromic sound basin includes paper basin base material, isolation layer, reversible photochromic layer and protection layer arranged in sequence.

[0008] The photochromic technology can change color through light or environmental change as a new technology. The utility model applies the photochromic technology to the loudspeaker sound basin, provides a photochromic sound basin with special appearance / visual effect, makes it appear color change under sunlight or ultraviolet light, and the discoloration effect is reversible, thereby increasing the attraction of product, showing better visual attraction and functionality, can provide more personalized and intelligent selection for the user, for example, light (ultraviolet) reminder, thereby increasing the application range of the sound basin.

[0009] The photochromic sound basin provided by the utility model includes paper basin base material, and isolation layer, reversible photochromic layer and protection layer arranged on it. The isolation layer can increase the rigidity of the paper basin, improve the flatness of the paper basin base material surface, make the photochromic layer can be stably arranged on the paper basin, and enhance the adhesion of the photochromic layer. The reversible photochromic layer has the photoresponsive discoloration characteristic, makes the sound basin appear color change under the light source stimulation (for example, sunlight or ultraviolet light), the discoloration response is fast, the color development is uniform, and the original color can be restored in a short time after the stimulation light source is turned off, presents the reversible discoloration effect, and increases the attraction of product. The protection layer further ensures the uniformity and stability of discoloration under the premise of ensuring photochromism, and improves the modulus, rigidity and waterproofness of the paper basin.

[0010] In summary, the utility model through the structure design and mutual matching between levels of isolation layer, reversible photochromic layer and protection layer, the photochromic sound basin has the photoresponsive discoloration characteristic, and the response speed is fast, the discoloration performance is reversible, realizes the diversified appearance demand. Meanwhile, the color development and discoloration effect of the photochromic sound basin are uniform and stable, the modulus, strength and rigidity are higher, have excellent mechanical properties, acoustic performance, sensitivity and sound quality effect, and the cost is lower, can satisfy different demands, has good applicability, can be used in some special scenes, for example, used for monitoring ultraviolet or outdoor scene.

[0011] The following is a preferred technical scheme of the present application, but is not a limitation on the technical scheme provided by the present application. Through the following preferred technical scheme, the purpose and beneficial effects of the present application can be better achieved and realized.

[0012] Preferably, the thickness of the isolation layer is 5-20 μm, for example, it can be 6 μm, 8 μm, 10 μm, 12 μm, 15 μm or 18 μm, and specific point values between the above point values. Due to the limited length and the consideration of simplicity, the present application does not exhaustively list the specific point values included in the range.

[0013] Preferably, the isolation layer includes any one of a polyvinyl alcohol isolation layer, a cationic guar gum isolation layer or a cationic starch isolation layer.

[0014] As a preferred technical scheme, the material of the isolation layer includes any one of polyvinyl alcohol, cationic guar gum or cationic starch, which has excellent film-forming property, can form a continuous and uniform isolation layer film on the paper basin substrate, fill the tiny unevenness on the surface of the paper basin substrate, and form a uniform and smooth surface. On the one hand, it helps to set the reversible photochromic layer, improves the interlayer force and adhesion between the paper basin substrate and the reversible photochromic layer, ensures that the reversible photochromic layer is firmly set on the surface of the paper basin, avoids the reversible photochromic layer from falling off or peeling, and ensures the stability and durability of the reversible photochromic layer. On the other hand, the setting of the isolation layer can enable the reversible photochromic layer to achieve excellent reversible color change effect at a lower thickness, reduce the penetration of the reversible photochromic layer in the paper basin, reduce the weight gain, and improve the overall visual effect of the paper basin, improve its aesthetic and sensitivity.

[0015] It should be noted that polyvinyl alcohol, cationic guar gum and cationic starch as the isolation layer are all materials available in the prior art.

[0016] Preferably, the thickness of the reversible photochromic layer is 25-50 μm, for example, it can be 26 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 42 μm, 45 μm or 48 μm, and specific point values between the above point values. Due to the limited length and the consideration of simplicity, the present application does not exhaustively list the specific point values included in the range.

[0017] Preferably, the reversible photochromic layer is a reversible photochromic microcapsule coating.

[0018] In the utility model, the reversible photochromic layer can be set according to the coloration requirement and the color change effect of the appearance of the cone product, so that the photochromic cone presents color under light stimulation (sunlight or ultraviolet light), such as blue, purple, orange, red, orange, green and the like, and the color disappears when the light stimulation is removed (for example, the ultraviolet light source is turned off and moved into the room), and the fading time is less than or equal to 20 min, preferably less than or equal to 10 min, more preferably less than or equal to 6 min, preferably less than or equal to 5 min, and even reaches 30-70s, for example, can be 40s, 50s, 60s and the like.

[0019] In the utility model, the reversible photochromic layer rapidly changes color under sunlight or ultraviolet light, and the color change response is fast. Preferably, the reversible photochromic layer can be formed by coating a photosensitive color-changing ink and a photosensitive color-changing paint and drying. The photosensitive color-changing ink and the photosensitive color-changing paint are materials known in the art, which can be purchased through market channels, or inks and paints with the formula disclosed in the prior art, such as the contents disclosed in CN106364090A and CN116004062A.

[0020] Preferably, the thickness of the protective layer is 10-30um, for example, can be 12um, 15um, 18um, 20um, 22um, 25um or 28um, and specific point values between the above point values, limited to the length and for the sake of simplicity, the utility model does not exhaustively list the specific point values included in the range.

[0021] Preferably, the protective layer is a transparent anti-UV protective layer.

[0022] As a preferred technical solution, the protective layer is a transparent anti-UV coating, which can effectively block ultraviolet light, thereby reducing the penetration of ultraviolet light, and the protective layer preferentially receives light under sunlight, and the ultraviolet light reaches the reversible photochromic layer after being weakened, color change occurs, which can provide stable anti-UV effect, improve the UV resistance of the photochromic cone, and make the product have excellent stability. In addition, the protective layer can also improve the overall rigidity and modulus of the photochromic cone, enhance the waterproof effect, effectively reduce resonance and sound distortion, enhance the durability of the cone surface, and improve the stability and sound quality of the loudspeaker.

[0023] Illustratively, the protective layer can be obtained by coating a transparent anti-UV paint and drying. The transparent anti-UV paint is a material known in the art, which can be purchased through market channels, or a transparent anti-UV paint with the formula disclosed in the prior art.

[0024] Preferably, the transparent anti-UV protective layer is a water-based polyurethane anti-ultraviolet varnish coating.

[0025] Preferably, the thickness of the paper basin substrate is 0.3-0.8mm, for example, it can be 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm or 0.7mm, and specific point values between the above point values, limited to the length and for the sake of simplicity, the specific point values included in the range are not listed.

[0026] Preferably, the density of the paper basin substrate is 0.4-0.9g / cm 3 , for example, it can be 0.45g / cm 3 , 0.5g / cm 3 , 0.55g / cm 3 , 0.6g / cm 3 , 0.65g / cm 3 , 0.7g / cm 3 , 0.75g / cm 3 , 0.8g / cm 3 or 0.85g / cm 3 , and specific point values between the above point values, limited to the length and for the sake of simplicity, the specific point values included in the range are not listed.

[0027] Preferably, the paper basin substrate is a white paper basin substrate or a light-colored paper basin substrate.

[0028] The paper basin substrate in the utility model is prepared from plant fiber pulp, which includes wood pulp, hemp pulp, cotton pulp, etc. The paper basin substrate can be purchased through market channels or prepared by known methods in the art, for example, referring to the content disclosed in CN115734129A.

[0029] Exemplarily, the photochromic sound basin is prepared by the following method:

[0030] An isolation layer, a reversible photochromic layer and a protective layer are sequentially arranged on the paper basin substrate to obtain the photochromic sound basin.

[0031] Preferably, the method comprises the following steps:

[0032] An isolation coating is coated on the paper basin substrate, and first dried to obtain the isolation layer;

[0033] A reversible photochromic coating is coated on the isolation layer, and second dried to obtain the reversible photochromic layer;

[0034] A protective coating is coated on the photochromic layer, and third dried to form the protective layer, thereby obtaining the photochromic sound basin.

[0035] Preferably, the isolating coating includes any one of a polyvinyl alcohol aqueous solution, a cationic guar gum aqueous solution or a cationic starch aqueous solution.

[0036] Preferably, the reversible photochromic coating includes a polymer matrix and reversible photochromic microcapsules, which can be purchased through market channels or existing technology disclosed coatings, such as CN106364090A, CN116004062A, etc.

[0037] Preferably, the protective coating includes a polymer matrix and nano-titanium dioxide, which can be purchased through market channels or existing technology disclosed coatings, such as CN104727150A.

[0038] Preferably, the method of coating the isolating coating, the reversible photochromic coating and the protective coating each independently includes spraying and / or spin coating.

[0039] Preferably, the spin coating speed is 200-3800 rpm, such as 300 rpm, 500 rpm, 800 rpm, 1000 rpm, 1200 rpm, 1500 rpm, 1800 rpm, 2000 rpm, 2200 rpm, 2500 rpm, 2800 rpm, 3000 rpm, 3200 rpm or 3500 rpm, and specific point values between the above point values, limited to the length and for the sake of simplicity, the utility model does not list the specific point values included in the range.

[0040] Preferably, the temperature of the first drying, the second drying and the third drying is 45-80℃, such as 48℃, 50℃, 52℃, 55℃, 58℃, 60℃, 62℃, 65℃, 68℃, 70℃, 72℃, 75℃ or 78℃, and specific point values between the above point values, limited to the length and for the sake of simplicity, the utility model does not list the specific point values included in the range, further preferably 50-70℃.

[0041] Preferably, the time of the first drying, the second drying and the third drying is 0.2-2h, such as 0.3h, 0.5h, 0.8h, 1h, 1.2h, 1.5h or 1.8h, and specific point values between the above point values, limited to the length and for the sake of simplicity, the utility model does not list the specific point values included in the range, further preferably 0.5-1.5h.

[0042] In the second aspect, the utility model provides a loudspeaker, the loudspeaker includes the photochromic sound basin as the first aspect.

[0043] Compared with the prior art, the utility model has the following beneficial effects:

[0044] The photochromic sound basin has the photoresponsive discoloration characteristic, can discolor under the irradiation of sunlight or ultraviolet light, has the fast discoloration response speed, the reversible discoloration performance, realizes the diversified appearance demand. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 The structure diagram of the photochromic sound basin provided for a specific embodiment is shown in the figure.

[0046] Wherein, 1-paper basin base material, 2-isolation layer, 3-reversible photochromic layer, 4-protection layer. DETAILED DESCRIPTION

[0047] The technical scheme of the utility model will be further illustrated by specific embodiments. Those skilled in the art should understand that the embodiments are only to help understand the utility model, and should not be regarded as the specific limitation of the utility model.

[0048] The terms "comprising", "including", "containing", "have" or any other similar words used in this document are intended to cover non-exclusive inclusion. For example, the composition, step, method, article or device containing the listed elements does not necessarily limit to those elements, but can also include other elements not explicitly listed or inherent to such composition, step, method, article or device.

[0049] "Optionally", "optionally" or "any" means that the matter or event described thereafter can occur or not occur, and the description includes the case where the event occurs and the case where the event does not occur.

[0050] In this document, the features defined as "first", "second" can explicitly or implicitly include one or more features, used to distinguish the described features, without order, without difference. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0051] In a specific embodiment, the structure diagram of the photochromic sound basin is shown in the figure, including paper basin base material 1, isolation layer 2, reversible photochromic layer 3 and protection layer 4 arranged in sequence. Figure 1 ​

[0052] The specific information of the material used in the following specific embodiments of the utility model is as follows:

[0053] (1) Paper basin substrate

[0054] Obtained by using the method / process known in the prior art, an exemplary preparation method is as follows: 60 parts of bleached kraft pulp, 30 parts of hemp pulp and 10 parts of cotton pulp are weighed, mixed and beaten to a beating degree of 20°SR, then diluted and defiberized by adding water, cationic styrene-acrylic emulsion 5 parts is added during defiberization, stirred and dispersed at a speed of 1000 rpm for 5 min, fully dispersed and uniform, to obtain a fiber suspension; the concentration of the fiber suspension is adjusted to 0.1%, filtered and formed on a paper machine, and then hot-pressed at 180℃ for 40s to obtain a white paper basin substrate, the thickness of the paper basin substrate is 0.45mm.

[0055] (2) Isolation layer:

[0056] The polyvinyl alcohol isolation layer is obtained by spin coating a polyvinyl alcohol aqueous solution on the paper basin substrate and then drying.

[0057] The cationic guar gum isolation layer is obtained by spin coating a cationic guar gum aqueous solution on the paper basin substrate and then drying.

[0058] The cationic starch isolation layer is obtained by spin coating a cationic starch aqueous solution on the paper basin substrate and then drying.

[0059] (3) Reversible photochromic layer

[0060] Obtained by coating a reversible photochromic coating on the isolation layer and then drying; the reversible photochromic coating is derived from different color photochromic inks from Shenzhen Qiansheng New Material Technology Co., Ltd.

[0061] (4) Protective layer

[0062] Obtained by coating a protective coating on the reversible photochromic layer and then drying; the protective coating is ULK906-water-based polyurethane matte varnish.

[0063] Example 1

[0064] A photochromic sound basin includes a white paper basin substrate, and an isolation layer, a reversible photochromic layer and a protective layer arranged in sequence on the paper basin substrate. Among them, the isolation layer is a polyvinyl alcohol isolation layer, the thickness is 15μm; the thickness of the reversible photochromic layer is 35μm; the thickness of the protective layer is 15μm.

[0065] Example 2

[0066] The photochromic sound basin comprises a white paper basin base material, and an isolation layer, a reversible photochromic layer and a protective layer arranged on the paper basin base material in sequence. The isolation layer is a polyvinyl alcohol isolation layer with a thickness of 20 microns; the reversible photochromic layer has a thickness of 40 microns; and the protective layer has a thickness of 10 microns.

[0067] Example 3

[0068] The photochromic sound basin comprises a white paper basin base material, and an isolation layer, a reversible photochromic layer and a protective layer arranged on the paper basin base material in sequence. The isolation layer is a cationic guar gum isolation layer with a thickness of 5 microns; the reversible photochromic layer has a thickness of 42 microns; and the protective layer has a thickness of 25 microns.

[0069] Example 4

[0070] The photochromic sound basin comprises a white paper basin base material, and an isolation layer, a reversible photochromic layer and a protective layer arranged on the paper basin base material in sequence. The isolation layer is a cationic guar gum isolation layer with a thickness of 10 microns; the reversible photochromic layer has a thickness of 25 microns; and the protective layer has a thickness of 15 microns.

[0071] Example 5

[0072] The photochromic sound basin comprises a white paper basin base material, and an isolation layer, a reversible photochromic layer and a protective layer arranged on the paper basin base material in sequence. The isolation layer is a cationic guar gum isolation layer with a thickness of 10 microns; the reversible photochromic layer has a thickness of 25 microns; and the protective layer has a thickness of 15 microns.

[0073] Example 6

[0074] The photochromic sound basin comprises a white paper basin base material, and an isolation layer, a reversible photochromic layer and a protective layer arranged on the paper basin base material in sequence. The isolation layer is a cationic guar gum isolation layer with a thickness of 10 microns; the reversible photochromic layer has a thickness of 25 microns; and the protective layer has a thickness of 15 microns.

[0075] Comparative Example 1

[0076] The photochromic sound basin is different from the example 1 only in that no isolation layer is arranged, and other layer structures and thicknesses are the same as those of the example 1.

[0077] Comparative Example 2

[0078] The photochromic sound basin is different from the example 1 only in that no protective layer is arranged, and other layer structures and thicknesses are the same as those of the example 1.

[0079] Comparative Example 3

[0080] A photochromic sound basin, which is only different from the embodiment 1 in that no isolation layer and protective layer are arranged, and other layer structures and thicknesses are the same as those of the embodiment 1.

[0081] The photochromic sound basin provided in the embodiments 1-6 and the comparative examples 1-3 is subjected to the following performance tests:

[0082] (1) Young's modulus and loss factor: the Young's modulus and the loss factor are measured by using an MPM material parameter module in a KLIPPEL test system;

[0083] (2) Color development effect: the color development of the surface of the paper basin is observed under sunlight, and the color development is marked as “uniform” if it is uniform and continuous, and the color development is marked as “poor” if it is not uniform and continuous,

[0084] The sound basin with uniform display is subjected to a UV aging test, and the test conditions are as follows: UV-a, 340 nm, 0.89 W / m 2 / nm, 60℃±3℃ continuous irradiation, and the reversible color change performance thereof is observed every 2h or so, and if the reversible color change performance disappears, it is marked as “failure”;

[0085] (3) Color fading time: the sample to be tested is placed under sunlight to change color, and then moved into a room, and the color fading time is counted;

[0086] The test results are shown in Table 1:

[0087] Table 1

[0088]

[0089]

[0090] As can be seen from the test data in Table 1, the isolation layer, the reversible photochromic layer and the protective layer are sequentially arranged on the paper basin substrate, and through the design of the layer structure and the compounding effect thereof, the color development and the color change effect of the photochromic sound basin are uniform and stable, have sensitive light response color change characteristics, the color change response under light is fast, and the color can be restored in the room within 30s. At the same time, the Young's modulus of the photochromic sound basin is 2.28-2.56 GPa, the loss factor is 0.037-0.052, and the photochromic sound basin has excellent mechanical properties, acoustic properties, sensitivity and sound quality effect; and has excellent ultraviolet aging resistance, and can still realize reversible color change after 24-30h of UV continuous irradiation, and has good applicability.

[0091] The sound cone of the comparative example 1 is not provided with the isolation layer, so that the modulus obviously decreases and the mechanical property is poor. The sound cone of the comparative example 2 is not provided with the protection layer, so that the modulus greatly decreases and the ultraviolet aging resistance property seriously decreases. The sound cone of the comparative example 3 only has the paper cone substrate and the reversible photochromic layer, so that the acoustic property, the mechanical property and the aging resistance property obviously decrease.

[0092] The applicant declares that the photochromic sound cone and the loudspeaker comprising the same of the utility model are illustrated by the above-mentioned embodiments, but the utility model is not limited to the above-mentioned embodiments, namely, it does not mean that the utility model must depend on the above-mentioned embodiments to be implemented. The person skilled in the art should understand that any improvement of the utility model, equivalent replacement of the raw materials and components selected by the utility model and addition of auxiliary components and members, selection of specific modes and the like all fall within the protection scope and the disclosure scope of the utility model.

Claims

1. A photochromic acoustic baffle characterized in that, The photochromic acoustic cone comprises, in sequence, a paper cone substrate, an isolation layer, a reversible photochromic layer and a protective layer. The thickness of the isolation layer is 5-20 µm, the thickness of the reversible photochromic layer is 25-50 µm, and the thickness of the protective layer is 10-30 µm.

2. The photochromic acoustic pod of claim 1, wherein, The isolation layer comprises any one of a polyvinyl alcohol isolation layer, a cationic guar gum isolation layer or a cationic starch isolation layer.

3. The photochromic acoustic pod of claim 1, wherein, The reversible photochromic layer is a reversible photochromic microcapsule coating.

4. The photochromic acoustic pod of claim 1, wherein, The protective layer is a transparent anti-UV protective layer.

5. The photochromic acoustic pod of claim 1, wherein, The thickness of the paper cone substrate is 0.3-0.8 mm.

6. The photochromic acoustic pod of claim 1, wherein, The density of the paper tub substrate is 0.4-0.9 g / cm 3 .

7. A loudspeaker, characterised in that The loudspeaker comprises the photochromic acoustic cone according to any one of claims 1-6.

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